text: //===- SemaChecking.cpp - Extra Semantic Checking -------------------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  //
  //  This file implements extra semantic analysis beyond what is enforced
  //  by the C type system.
  //
  //===----------------------------------------------------------------------===//
  
  #include "clang/AST/APValue.h"
  #include "clang/AST/ASTContext.h"
  #include "clang/AST/Attr.h"
  #include "clang/AST/AttrIterator.h"
  #include "clang/AST/CharUnits.h"
  #include "clang/AST/Decl.h"
  #include "clang/AST/DeclBase.h"
  #include "clang/AST/DeclCXX.h"
  #include "clang/AST/DeclObjC.h"
  #include "clang/AST/DeclarationName.h"
  #include "clang/AST/EvaluatedExprVisitor.h"
  #include "clang/AST/Expr.h"
  #include "clang/AST/ExprCXX.h"
  #include "clang/AST/ExprObjC.h"
  #include "clang/AST/ExprOpenMP.h"
  #include "clang/AST/FormatString.h"
  #include "clang/AST/NSAPI.h"
  #include "clang/AST/NonTrivialTypeVisitor.h"
  #include "clang/AST/OperationKinds.h"
  #include "clang/AST/RecordLayout.h"
  #include "clang/AST/Stmt.h"
  #include "clang/AST/TemplateBase.h"
  #include "clang/AST/Type.h"
  #include "clang/AST/TypeLoc.h"
  #include "clang/AST/UnresolvedSet.h"
  #include "clang/Basic/AddressSpaces.h"
  #include "clang/Basic/CharInfo.h"
  #include "clang/Basic/Diagnostic.h"
  #include "clang/Basic/IdentifierTable.h"
  #include "clang/Basic/LLVM.h"
  #include "clang/Basic/LangOptions.h"
  #include "clang/Basic/OpenCLOptions.h"
  #include "clang/Basic/OperatorKinds.h"
  #include "clang/Basic/PartialDiagnostic.h"
  #include "clang/Basic/SourceLocation.h"
  #include "clang/Basic/SourceManager.h"
  #include "clang/Basic/Specifiers.h"
  #include "clang/Basic/SyncScope.h"
  #include "clang/Basic/TargetBuiltins.h"
  #include "clang/Basic/TargetCXXABI.h"
  #include "clang/Basic/TargetInfo.h"
  #include "clang/Basic/TypeTraits.h"
  #include "clang/Lex/Lexer.h" // TODO: Extract static functions to fix layering.
  #include "clang/Sema/Initialization.h"
  #include "clang/Sema/Lookup.h"
  #include "clang/Sema/Ownership.h"
  #include "clang/Sema/Scope.h"
  #include "clang/Sema/ScopeInfo.h"
  #include "clang/Sema/Sema.h"
  #include "clang/Sema/SemaInternal.h"
  #include "llvm/ADT/APFloat.h"
  #include "llvm/ADT/APInt.h"
  #include "llvm/ADT/APSInt.h"
  #include "llvm/ADT/ArrayRef.h"
  #include "llvm/ADT/DenseMap.h"
  #include "llvm/ADT/FoldingSet.h"
  #include "llvm/ADT/None.h"
  #include "llvm/ADT/Optional.h"
  #include "llvm/ADT/STLExtras.h"
  #include "llvm/ADT/SmallBitVector.h"
  #include "llvm/ADT/SmallPtrSet.h"
  #include "llvm/ADT/SmallString.h"
  #include "llvm/ADT/SmallVector.h"
  #include "llvm/ADT/StringRef.h"
  #include "llvm/ADT/StringSwitch.h"
  #include "llvm/ADT/Triple.h"
  #include "llvm/Support/AtomicOrdering.h"
  #include "llvm/Support/Casting.h"
  #include "llvm/Support/Compiler.h"
  #include "llvm/Support/ConvertUTF.h"
  #include "llvm/Support/ErrorHandling.h"
  #include "llvm/Support/Format.h"
  #include "llvm/Support/Locale.h"
  #include "llvm/Support/MathExtras.h"
  #include "llvm/Support/SaveAndRestore.h"
  #include "llvm/Support/raw_ostream.h"
  #include <algorithm>
  #include <cassert>
  #include <cstddef>
  #include <cstdint>
  #include <functional>
  #include <limits>
  #include <string>
  #include <tuple>
  #include <utility>
  
  using namespace clang;
  using namespace sema;
  
  SourceLocation Sema::getLocationOfStringLiteralByte(const StringLiteral *SL,
                                                      unsigned ByteNo) const {
    return SL->getLocationOfByte(ByteNo, getSourceManager(), LangOpts,
                                 Context.getTargetInfo());
  }
  
  /// Checks that a call expression's argument count is the desired number.
  /// This is useful when doing custom type-checking.  Returns true on error.
  static bool checkArgCount(Sema &S, CallExpr *call, unsigned desiredArgCount) {
    unsigned argCount = call->getNumArgs();
    if (argCount == desiredArgCount) return false;
  
    if (argCount < desiredArgCount)
      return S.Diag(call->getEndLoc(), diag::err_typecheck_call_too_few_args)
             << 0 /*function call*/ << desiredArgCount << argCount
             << call->getSourceRange();
  
    // Highlight all the excess arguments.
    SourceRange range(call->getArg(desiredArgCount)->getBeginLoc(),
                      call->getArg(argCount - 1)->getEndLoc());
  
    return S.Diag(range.getBegin(), diag::err_typecheck_call_too_many_args)
      << 0 /*function call*/ << desiredArgCount << argCount
      << call->getArg(1)->getSourceRange();
  }
  
  static bool convertArgumentToType(Sema &S, Expr *&Value, QualType Ty) {
    if (Value->isTypeDependent())
      return false;
  
    InitializedEntity Entity =
      InitializedEntity::InitializeParameter(S.Context, Ty, false);
    ExprResult Result =
      S.PerformCopyInitialization(Entity, SourceLocation(), Value);
    if (Result.isInvalid())
      return true;
    Value = Result.get();
    return false;
  }
  
  /// Check that the first argument to __builtin_annotation is an integer
  /// and the second argument is a non-wide string literal.
  static bool SemaBuiltinAnnotation(Sema &S, CallExpr *TheCall) {
    if (checkArgCount(S, TheCall, 2))
      return true;
  
    // First argument should be an integer.
    Expr *ValArg = TheCall->getArg(0);
    QualType Ty = ValArg->getType();
    if (!Ty->isIntegerType()) {
      S.Diag(ValArg->getBeginLoc(), diag::err_builtin_annotation_first_arg)
          << ValArg->getSourceRange();
      return true;
    }
  
    // Second argument should be a constant string.
    Expr *StrArg = TheCall->getArg(1)->IgnoreParenCasts();
    StringLiteral *Literal = dyn_cast<StringLiteral>(StrArg);
    if (!Literal || !Literal->isAscii()) {
      S.Diag(StrArg->getBeginLoc(), diag::err_builtin_annotation_second_arg)
          << StrArg->getSourceRange();
      return true;
    }
  
    TheCall->setType(Ty);
    return false;
  }
  
  static bool SemaBuiltinMSVCAnnotation(Sema &S, CallExpr *TheCall) {
    // We need at least one argument.
    if (TheCall->getNumArgs() < 1) {
      S.Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args_at_least)
          << 0 << 1 << TheCall->getNumArgs()
          << TheCall->getCallee()->getSourceRange();
      return true;
    }
  
    // All arguments should be wide string literals.
    for (Expr *Arg : TheCall->arguments()) {
      auto *Literal = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts());
      if (!Literal || !Literal->isWide()) {
        S.Diag(Arg->getBeginLoc(), diag::err_msvc_annotation_wide_str)
            << Arg->getSourceRange();
        return true;
      }
    }
  
    return false;
  }
  
  /// Check that the argument to __builtin_addressof is a glvalue, and set the
  /// result type to the corresponding pointer type.
  static bool SemaBuiltinAddressof(Sema &S, CallExpr *TheCall) {
    if (checkArgCount(S, TheCall, 1))
      return true;
  
    ExprResult Arg(TheCall->getArg(0));
    QualType ResultType = S.CheckAddressOfOperand(Arg, TheCall->getBeginLoc());
    if (ResultType.isNull())
      return true;
  
    TheCall->setArg(0, Arg.get());
    TheCall->setType(ResultType);
    return false;
  }
  
  /// Check the number of arguments and set the result type to
  /// the argument type.
  static bool SemaBuiltinPreserveAI(Sema &S, CallExpr *TheCall) {
    if (checkArgCount(S, TheCall, 1))
      return true;
  
    TheCall->setType(TheCall->getArg(0)->getType());
    return false;
  }
  
  static bool SemaBuiltinOverflow(Sema &S, CallExpr *TheCall) {
    if (checkArgCount(S, TheCall, 3))
      return true;
  
    // First two arguments should be integers.
    for (unsigned I = 0; I < 2; ++I) {
      ExprResult Arg = TheCall->getArg(I);
      QualType Ty = Arg.get()->getType();
      if (!Ty->isIntegerType()) {
        S.Diag(Arg.get()->getBeginLoc(), diag::err_overflow_builtin_must_be_int)
            << Ty << Arg.get()->getSourceRange();
        return true;
      }
      InitializedEntity Entity = InitializedEntity::InitializeParameter(
          S.getASTContext(), Ty, /*consume*/ false);
      Arg = S.PerformCopyInitialization(Entity, SourceLocation(), Arg);
      if (Arg.isInvalid())
        return true;
      TheCall->setArg(I, Arg.get());
    }
  
    // Third argument should be a pointer to a non-const integer.
    // IRGen correctly handles volatile, restrict, and address spaces, and
    // the other qualifiers aren't possible.
    {
      ExprResult Arg = TheCall->getArg(2);
      QualType Ty = Arg.get()->getType();
      const auto *PtrTy = Ty->getAs<PointerType>();
      if (!(PtrTy && PtrTy->getPointeeType()->isIntegerType() &&
            !PtrTy->getPointeeType().isConstQualified())) {
        S.Diag(Arg.get()->getBeginLoc(),
               diag::err_overflow_builtin_must_be_ptr_int)
            << Ty << Arg.get()->getSourceRange();
        return true;
      }
      InitializedEntity Entity = InitializedEntity::InitializeParameter(
          S.getASTContext(), Ty, /*consume*/ false);
      Arg = S.PerformCopyInitialization(Entity, SourceLocation(), Arg);
      if (Arg.isInvalid())
        return true;
      TheCall->setArg(2, Arg.get());
    }
    return false;
  }
  
  static bool SemaBuiltinCallWithStaticChain(Sema &S, CallExpr *BuiltinCall) {
    if (checkArgCount(S, BuiltinCall, 2))
      return true;
  
    SourceLocation BuiltinLoc = BuiltinCall->getBeginLoc();
    Expr *Builtin = BuiltinCall->getCallee()->IgnoreImpCasts();
    Expr *Call = BuiltinCall->getArg(0);
    Expr *Chain = BuiltinCall->getArg(1);
  
    if (Call->getStmtClass() != Stmt::CallExprClass) {
      S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_not_call)
          << Call->getSourceRange();
      return true;
    }
  
    auto CE = cast<CallExpr>(Call);
    if (CE->getCallee()->getType()->isBlockPointerType()) {
      S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_block_call)
          << Call->getSourceRange();
      return true;
    }
  
    const Decl *TargetDecl = CE->getCalleeDecl();
    if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(TargetDecl))
      if (FD->getBuiltinID()) {
        S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_builtin_call)
            << Call->getSourceRange();
        return true;
      }
  
    if (isa<CXXPseudoDestructorExpr>(CE->getCallee()->IgnoreParens())) {
      S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_pdtor_call)
          << Call->getSourceRange();
      return true;
    }
  
    ExprResult ChainResult = S.UsualUnaryConversions(Chain);
    if (ChainResult.isInvalid())
      return true;
    if (!ChainResult.get()->getType()->isPointerType()) {
      S.Diag(BuiltinLoc, diag::err_second_argument_to_cwsc_not_pointer)
          << Chain->getSourceRange();
      return true;
    }
  
    QualType ReturnTy = CE->getCallReturnType(S.Context);
    QualType ArgTys[2] = { ReturnTy, ChainResult.get()->getType() };
    QualType BuiltinTy = S.Context.getFunctionType(
        ReturnTy, ArgTys, FunctionProtoType::ExtProtoInfo());
    QualType BuiltinPtrTy = S.Context.getPointerType(BuiltinTy);
  
    Builtin =
        S.ImpCastExprToType(Builtin, BuiltinPtrTy, CK_BuiltinFnToFnPtr).get();
  
    BuiltinCall->setType(CE->getType());
    BuiltinCall->setValueKind(CE->getValueKind());
    BuiltinCall->setObjectKind(CE->getObjectKind());
    BuiltinCall->setCallee(Builtin);
    BuiltinCall->setArg(1, ChainResult.get());
  
    return false;
  }
  
  /// Check a call to BuiltinID for buffer overflows. If BuiltinID is a
  /// __builtin_*_chk function, then use the object size argument specified in the
  /// source. Otherwise, infer the object size using __builtin_object_size.
  void Sema::checkFortifiedBuiltinMemoryFunction(FunctionDecl *FD,
                                                 CallExpr *TheCall) {
    // FIXME: There are some more useful checks we could be doing here:
    //  - Analyze the format string of sprintf to see how much of buffer is used.
    //  - Evaluate strlen of strcpy arguments, use as object size.
  
    if (TheCall->isValueDependent() || TheCall->isTypeDependent() ||
        isConstantEvaluated())
      return;
  
    unsigned BuiltinID = FD->getBuiltinID(/*ConsiderWrappers=*/true);
    if (!BuiltinID)
      return;
  
    unsigned DiagID = 0;
    bool IsChkVariant = false;
    unsigned SizeIndex, ObjectIndex;
    switch (BuiltinID) {
    default:
      return;
    case Builtin::BI__builtin___memcpy_chk:
    case Builtin::BI__builtin___memmove_chk:
    case Builtin::BI__builtin___memset_chk:
    case Builtin::BI__builtin___strlcat_chk:
    case Builtin::BI__builtin___strlcpy_chk:
    case Builtin::BI__builtin___strncat_chk:
    case Builtin::BI__builtin___strncpy_chk:
    case Builtin::BI__builtin___stpncpy_chk:
    case Builtin::BI__builtin___memccpy_chk: {
      DiagID = diag::warn_builtin_chk_overflow;
      IsChkVariant = true;
      SizeIndex = TheCall->getNumArgs() - 2;
      ObjectIndex = TheCall->getNumArgs() - 1;
      break;
    }
  
    case Builtin::BI__builtin___snprintf_chk:
    case Builtin::BI__builtin___vsnprintf_chk: {
      DiagID = diag::warn_builtin_chk_overflow;
      IsChkVariant = true;
      SizeIndex = 1;
      ObjectIndex = 3;
      break;
    }
  
    case Builtin::BIstrncat:
    case Builtin::BI__builtin_strncat:
    case Builtin::BIstrncpy:
    case Builtin::BI__builtin_strncpy:
    case Builtin::BIstpncpy:
    case Builtin::BI__builtin_stpncpy: {
      // Whether these functions overflow depends on the runtime strlen of the
      // string, not just the buffer size, so emitting the "always overflow"
      // diagnostic isn't quite right. We should still diagnose passing a buffer
      // size larger than the destination buffer though; this is a runtime abort
      // in _FORTIFY_SOURCE mode, and is quite suspicious otherwise.
      DiagID = diag::warn_fortify_source_size_mismatch;
      SizeIndex = TheCall->getNumArgs() - 1;
      ObjectIndex = 0;
      break;
    }
  
    case Builtin::BImemcpy:
    case Builtin::BI__builtin_memcpy:
    case Builtin::BImemmove:
    case Builtin::BI__builtin_memmove:
    case Builtin::BImemset:
    case Builtin::BI__builtin_memset: {
      DiagID = diag::warn_fortify_source_overflow;
      SizeIndex = TheCall->getNumArgs() - 1;
      ObjectIndex = 0;
      break;
    }
    case Builtin::BIsnprintf:
    case Builtin::BI__builtin_snprintf:
    case Builtin::BIvsnprintf:
    case Builtin::BI__builtin_vsnprintf: {
      DiagID = diag::warn_fortify_source_size_mismatch;
      SizeIndex = 1;
      ObjectIndex = 0;
      break;
    }
    }
  
    llvm::APSInt ObjectSize;
    // For __builtin___*_chk, the object size is explicitly provided by the caller
    // (usually using __builtin_object_size). Use that value to check this call.
    if (IsChkVariant) {
      Expr::EvalResult Result;
      Expr *SizeArg = TheCall->getArg(ObjectIndex);
      if (!SizeArg->EvaluateAsInt(Result, getASTContext()))
        return;
      ObjectSize = Result.Val.getInt();
  
    // Otherwise, try to evaluate an imaginary call to __builtin_object_size.
    } else {
      // If the parameter has a pass_object_size attribute, then we should use its
      // (potentially) more strict checking mode. Otherwise, conservatively assume
      // type 0.
      int BOSType = 0;
      if (const auto *POS =
              FD->getParamDecl(ObjectIndex)->getAttr<PassObjectSizeAttr>())
        BOSType = POS->getType();
  
      Expr *ObjArg = TheCall->getArg(ObjectIndex);
      uint64_t Result;
      if (!ObjArg->tryEvaluateObjectSize(Result, getASTContext(), BOSType))
        return;
      // Get the object size in the target's size_t width.
      const TargetInfo &TI = getASTContext().getTargetInfo();
      unsigned SizeTypeWidth = TI.getTypeWidth(TI.getSizeType());
      ObjectSize = llvm::APSInt::getUnsigned(Result).extOrTrunc(SizeTypeWidth);
    }
  
    // Evaluate the number of bytes of the object that this call will use.
    Expr::EvalResult Result;
    Expr *UsedSizeArg = TheCall->getArg(SizeIndex);
    if (!UsedSizeArg->EvaluateAsInt(Result, getASTContext()))
      return;
    llvm::APSInt UsedSize = Result.Val.getInt();
  
    if (UsedSize.ule(ObjectSize))
      return;
  
    StringRef FunctionName = getASTContext().BuiltinInfo.getName(BuiltinID);
    // Skim off the details of whichever builtin was called to produce a better
    // diagnostic, as it's unlikley that the user wrote the __builtin explicitly.
    if (IsChkVariant) {
      FunctionName = FunctionName.drop_front(std::strlen("__builtin___"));
      FunctionName = FunctionName.drop_back(std::strlen("_chk"));
    } else if (FunctionName.startswith("__builtin_")) {
      FunctionName = FunctionName.drop_front(std::strlen("__builtin_"));
    }
  
    DiagRuntimeBehavior(TheCall->getBeginLoc(), TheCall,
                        PDiag(DiagID)
                            << FunctionName << ObjectSize.toString(/*Radix=*/10)
                            << UsedSize.toString(/*Radix=*/10));
  }
  
  static bool SemaBuiltinSEHScopeCheck(Sema &SemaRef, CallExpr *TheCall,
                                       Scope::ScopeFlags NeededScopeFlags,
                                       unsigned DiagID) {
    // Scopes aren't available during instantiation. Fortunately, builtin
    // functions cannot be template args so they cannot be formed through template
    // instantiation. Therefore checking once during the parse is sufficient.
    if (SemaRef.inTemplateInstantiation())
      return false;
  
    Scope *S = SemaRef.getCurScope();
    while (S && !S->isSEHExceptScope())
      S = S->getParent();
    if (!S || !(S->getFlags() & NeededScopeFlags)) {
      auto *DRE = cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
      SemaRef.Diag(TheCall->getExprLoc(), DiagID)
          << DRE->getDecl()->getIdentifier();
      return true;
    }
  
    return false;
  }
  
  static inline bool isBlockPointer(Expr *Arg) {
    return Arg->getType()->isBlockPointerType();
  }
  
  /// OpenCL C v2.0, s6.13.17.2 - Checks that the block parameters are all local
  /// void*, which is a requirement of device side enqueue.
  static bool checkOpenCLBlockArgs(Sema &S, Expr *BlockArg) {
    const BlockPointerType *BPT =
        cast<BlockPointerType>(BlockArg->getType().getCanonicalType());
    ArrayRef<QualType> Params =
        BPT->getPointeeType()->castAs<FunctionProtoType>()->getParamTypes();
    unsigned ArgCounter = 0;
    bool IllegalParams = false;
    // Iterate through the block parameters until either one is found that is not
    // a local void*, or the block is valid.
    for (ArrayRef<QualType>::iterator I = Params.begin(), E = Params.end();
         I != E; ++I, ++ArgCounter) {
      if (!(*I)->isPointerType() || !(*I)->getPointeeType()->isVoidType() ||
          (*I)->getPointeeType().getQualifiers().getAddressSpace() !=
              LangAS::opencl_local) {
        // Get the location of the error. If a block literal has been passed
        // (BlockExpr) then we can point straight to the offending argument,
        // else we just point to the variable reference.
        SourceLocation ErrorLoc;
        if (isa<BlockExpr>(BlockArg)) {
          BlockDecl *BD = cast<BlockExpr>(BlockArg)->getBlockDecl();
          ErrorLoc = BD->getParamDecl(ArgCounter)->getBeginLoc();
        } else if (isa<DeclRefExpr>(BlockArg)) {
          ErrorLoc = cast<DeclRefExpr>(BlockArg)->getBeginLoc();
        }
        S.Diag(ErrorLoc,
               diag::err_opencl_enqueue_kernel_blocks_non_local_void_args);
        IllegalParams = true;
      }
    }
  
    return IllegalParams;
  }
  
  static bool checkOpenCLSubgroupExt(Sema &S, CallExpr *Call) {
    if (!S.getOpenCLOptions().isEnabled("cl_khr_subgroups")) {
      S.Diag(Call->getBeginLoc(), diag::err_opencl_requires_extension)
          << 1 << Call->getDirectCallee() << "cl_khr_subgroups";
      return true;
    }
    return false;
  }
  
  static bool SemaOpenCLBuiltinNDRangeAndBlock(Sema &S, CallExpr *TheCall) {
    if (checkArgCount(S, TheCall, 2))
      return true;
  
    if (checkOpenCLSubgroupExt(S, TheCall))
      return true;
  
    // First argument is an ndrange_t type.
    Expr *NDRangeArg = TheCall->getArg(0);
    if (NDRangeArg->getType().getUnqualifiedType().getAsString() != "ndrange_t") {
      S.Diag(NDRangeArg->getBeginLoc(), diag::err_opencl_builtin_expected_type)
          << TheCall->getDirectCallee() << "'ndrange_t'";
      return true;
    }
  
    Expr *BlockArg = TheCall->getArg(1);
    if (!isBlockPointer(BlockArg)) {
      S.Diag(BlockArg->getBeginLoc(), diag::err_opencl_builtin_expected_type)
          << TheCall->getDirectCallee() << "block";
      return true;
    }
    return checkOpenCLBlockArgs(S, BlockArg);
  }
  
  /// OpenCL C v2.0, s6.13.17.6 - Check the argument to the
  /// get_kernel_work_group_size
  /// and get_kernel_preferred_work_group_size_multiple builtin functions.
  static bool SemaOpenCLBuiltinKernelWorkGroupSize(Sema &S, CallExpr *TheCall) {
    if (checkArgCount(S, TheCall, 1))
      return true;
  
    Expr *BlockArg = TheCall->getArg(0);
    if (!isBlockPointer(BlockArg)) {
      S.Diag(BlockArg->getBeginLoc(), diag::err_opencl_builtin_expected_type)
          << TheCall->getDirectCallee() << "block";
      return true;
    }
    return checkOpenCLBlockArgs(S, BlockArg);
  }
  
  /// Diagnose integer type and any valid implicit conversion to it.
  static bool checkOpenCLEnqueueIntType(Sema &S, Expr *E,
                                        const QualType &IntType);
  
  static bool checkOpenCLEnqueueLocalSizeArgs(Sema &S, CallExpr *TheCall,
                                              unsigned Start, unsigned End) {
    bool IllegalParams = false;
    for (unsigned I = Start; I <= End; ++I)
      IllegalParams |= checkOpenCLEnqueueIntType(S, TheCall->getArg(I),
                                                S.Context.getSizeType());
    return IllegalParams;
  }
  
  /// OpenCL v2.0, s6.13.17.1 - Check that sizes are provided for all
  /// 'local void*' parameter of passed block.
  static bool checkOpenCLEnqueueVariadicArgs(Sema &S, CallExpr *TheCall,
                                             Expr *BlockArg,
                                             unsigned NumNonVarArgs) {
    const BlockPointerType *BPT =
        cast<BlockPointerType>(BlockArg->getType().getCanonicalType());
    unsigned NumBlockParams =
        BPT->getPointeeType()->castAs<FunctionProtoType>()->getNumParams();
    unsigned TotalNumArgs = TheCall->getNumArgs();
  
    // For each argument passed to the block, a corresponding uint needs to
    // be passed to describe the size of the local memory.
    if (TotalNumArgs != NumBlockParams + NumNonVarArgs) {
      S.Diag(TheCall->getBeginLoc(),
             diag::err_opencl_enqueue_kernel_local_size_args);
      return true;
    }
  
    // Check that the sizes of the local memory are specified by integers.
    return checkOpenCLEnqueueLocalSizeArgs(S, TheCall, NumNonVarArgs,
                                           TotalNumArgs - 1);
  }
  
  /// OpenCL C v2.0, s6.13.17 - Enqueue kernel function contains four different
  /// overload formats specified in Table 6.13.17.1.
  /// int enqueue_kernel(queue_t queue,
  ///                    kernel_enqueue_flags_t flags,
  ///                    const ndrange_t ndrange,
  ///                    void (^block)(void))
  /// int enqueue_kernel(queue_t queue,
  ///                    kernel_enqueue_flags_t flags,
  ///                    const ndrange_t ndrange,
  ///                    uint num_events_in_wait_list,
  ///                    clk_event_t *event_wait_list,
  ///                    clk_event_t *event_ret,
  ///                    void (^block)(void))
  /// int enqueue_kernel(queue_t queue,
  ///                    kernel_enqueue_flags_t flags,
  ///                    const ndrange_t ndrange,
  ///                    void (^block)(local void*, ...),
  ///                    uint size0, ...)
  /// int enqueue_kernel(queue_t queue,
  ///                    kernel_enqueue_flags_t flags,
  ///                    const ndrange_t ndrange,
  ///                    uint num_events_in_wait_list,
  ///                    clk_event_t *event_wait_list,
  ///                    clk_event_t *event_ret,
  ///                    void (^block)(local void*, ...),
  ///                    uint size0, ...)
  static bool SemaOpenCLBuiltinEnqueueKernel(Sema &S, CallExpr *TheCall) {
    unsigned NumArgs = TheCall->getNumArgs();
  
    if (NumArgs < 4) {
      S.Diag(TheCall->getBeginLoc(),
             diag::err_typecheck_call_too_few_args_at_least)
          << 0 << 4 << NumArgs;
      return true;
    }
  
    Expr *Arg0 = TheCall->getArg(0);
    Expr *Arg1 = TheCall->getArg(1);
    Expr *Arg2 = TheCall->getArg(2);
    Expr *Arg3 = TheCall->getArg(3);
  
    // First argument always needs to be a queue_t type.
    if (!Arg0->getType()->isQueueT()) {
      S.Diag(TheCall->getArg(0)->getBeginLoc(),
             diag::err_opencl_builtin_expected_type)
          << TheCall->getDirectCallee() << S.Context.OCLQueueTy;
      return true;
    }
  
    // Second argument always needs to be a kernel_enqueue_flags_t enum value.
    if (!Arg1->getType()->isIntegerType()) {
      S.Diag(TheCall->getArg(1)->getBeginLoc(),
             diag::err_opencl_builtin_expected_type)
          << TheCall->getDirectCallee() << "'kernel_enqueue_flags_t' (i.e. uint)";
      return true;
    }
  
    // Third argument is always an ndrange_t type.
    if (Arg2->getType().getUnqualifiedType().getAsString() != "ndrange_t") {
      S.Diag(TheCall->getArg(2)->getBeginLoc(),
             diag::err_opencl_builtin_expected_type)
          << TheCall->getDirectCallee() << "'ndrange_t'";
      return true;
    }
  
    // With four arguments, there is only one form that the function could be
    // called in: no events and no variable arguments.
    if (NumArgs == 4) {
      // check that the last argument is the right block type.
      if (!isBlockPointer(Arg3)) {
        S.Diag(Arg3->getBeginLoc(), diag::err_opencl_builtin_expected_type)
            << TheCall->getDirectCallee() << "block";
        return true;
      }
      // we have a block type, check the prototype
      const BlockPointerType *BPT =
          cast<BlockPointerType>(Arg3->getType().getCanonicalType());
      if (BPT->getPointeeType()->castAs<FunctionProtoType>()->getNumParams() > 0) {
        S.Diag(Arg3->getBeginLoc(),
               diag::err_opencl_enqueue_kernel_blocks_no_args);
        return true;
      }
      return false;
    }
    // we can have block + varargs.
    if (isBlockPointer(Arg3))
      return (checkOpenCLBlockArgs(S, Arg3) ||
              checkOpenCLEnqueueVariadicArgs(S, TheCall, Arg3, 4));
    // last two cases with either exactly 7 args or 7 args and varargs.
    if (NumArgs >= 7) {
      // check common block argument.
      Expr *Arg6 = TheCall->getArg(6);
      if (!isBlockPointer(Arg6)) {
        S.Diag(Arg6->getBeginLoc(), diag::err_opencl_builtin_expected_type)
            << TheCall->getDirectCallee() << "block";
        return true;
      }
      if (checkOpenCLBlockArgs(S, Arg6))
        return true;
  
      // Forth argument has to be any integer type.
      if (!Arg3->getType()->isIntegerType()) {
        S.Diag(TheCall->getArg(3)->getBeginLoc(),
               diag::err_opencl_builtin_expected_type)
            << TheCall->getDirectCallee() << "integer";
        return true;
      }
      // check remaining common arguments.
      Expr *Arg4 = TheCall->getArg(4);
      Expr *Arg5 = TheCall->getArg(5);
  
      // Fifth argument is always passed as a pointer to clk_event_t.
      if (!Arg4->isNullPointerConstant(S.Context,
                                       Expr::NPC_ValueDependentIsNotNull) &&
          !Arg4->getType()->getPointeeOrArrayElementType()->isClkEventT()) {
        S.Diag(TheCall->getArg(4)->getBeginLoc(),
               diag::err_opencl_builtin_expected_type)
            << TheCall->getDirectCallee()
            << S.Context.getPointerType(S.Context.OCLClkEventTy);
        return true;
      }
  
      // Sixth argument is always passed as a pointer to clk_event_t.
      if (!Arg5->isNullPointerConstant(S.Context,
                                       Expr::NPC_ValueDependentIsNotNull) &&
          !(Arg5->getType()->isPointerType() &&
            Arg5->getType()->getPointeeType()->isClkEventT())) {
        S.Diag(TheCall->getArg(5)->getBeginLoc(),
               diag::err_opencl_builtin_expected_type)
            << TheCall->getDirectCallee()
            << S.Context.getPointerType(S.Context.OCLClkEventTy);
        return true;
      }
  
      if (NumArgs == 7)
        return false;
  
      return checkOpenCLEnqueueVariadicArgs(S, TheCall, Arg6, 7);
    }
  
    // None of the specific case has been detected, give generic error
    S.Diag(TheCall->getBeginLoc(),
           diag::err_opencl_enqueue_kernel_incorrect_args);
    return true;
  }
  
  /// Returns OpenCL access qual.
  static OpenCLAccessAttr *getOpenCLArgAccess(const Decl *D) {
      return D->getAttr<OpenCLAccessAttr>();
  }
  
  /// Returns true if pipe element type is different from the pointer.
  static bool checkOpenCLPipeArg(Sema &S, CallExpr *Call) {
    const Expr *Arg0 = Call->getArg(0);
    // First argument type should always be pipe.
    if (!Arg0->getType()->isPipeType()) {
      S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_first_arg)
          << Call->getDirectCallee() << Arg0->getSourceRange();
      return true;
    }
    OpenCLAccessAttr *AccessQual =
        getOpenCLArgAccess(cast<DeclRefExpr>(Arg0)->getDecl());
    // Validates the access qualifier is compatible with the call.
    // OpenCL v2.0 s6.13.16 - The access qualifiers for pipe should only be
    // read_only and write_only, and assumed to be read_only if no qualifier is
    // specified.
    switch (Call->getDirectCallee()->getBuiltinID()) {
    case Builtin::BIread_pipe:
    case Builtin::BIreserve_read_pipe:
    case Builtin::BIcommit_read_pipe:
    case Builtin::BIwork_group_reserve_read_pipe:
    case Builtin::BIsub_group_reserve_read_pipe:
    case Builtin::BIwork_group_commit_read_pipe:
    case Builtin::BIsub_group_commit_read_pipe:
      if (!(!AccessQual || AccessQual->isReadOnly())) {
        S.Diag(Arg0->getBeginLoc(),
               diag::err_opencl_builtin_pipe_invalid_access_modifier)
            << "read_only" << Arg0->getSourceRange();
        return true;
      }
      break;
    case Builtin::BIwrite_pipe:
    case Builtin::BIreserve_write_pipe:
    case Builtin::BIcommit_write_pipe:
    case Builtin::BIwork_group_reserve_write_pipe:
    case Builtin::BIsub_group_reserve_write_pipe:
    case Builtin::BIwork_group_commit_write_pipe:
    case Builtin::BIsub_group_commit_write_pipe:
      if (!(AccessQual && AccessQual->isWriteOnly())) {
        S.Diag(Arg0->getBeginLoc(),
               diag::err_opencl_builtin_pipe_invalid_access_modifier)
            << "write_only" << Arg0->getSourceRange();
        return true;
      }
      break;
    default:
      break;
    }
    return false;
  }
  
  /// Returns true if pipe element type is different from the pointer.
  static bool checkOpenCLPipePacketType(Sema &S, CallExpr *Call, unsigned Idx) {
    const Expr *Arg0 = Call->getArg(0);
    const Expr *ArgIdx = Call->getArg(Idx);
    const PipeType *PipeTy = cast<PipeType>(Arg0->getType());
    const QualType EltTy = PipeTy->getElementType();
    const PointerType *ArgTy = ArgIdx->getType()->getAs<PointerType>();
    // The Idx argument should be a pointer and the type of the pointer and
    // the type of pipe element should also be the same.
    if (!ArgTy ||
        !S.Context.hasSameType(
            EltTy, ArgTy->getPointeeType()->getCanonicalTypeInternal())) {
      S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
          << Call->getDirectCallee() << S.Context.getPointerType(EltTy)
          << ArgIdx->getType() << ArgIdx->getSourceRange();
      return true;
    }
    return false;
  }
  
  // Performs semantic analysis for the read/write_pipe call.
  // \param S Reference to the semantic analyzer.
  // \param Call A pointer to the builtin call.
  // \return True if a semantic error has been found, false otherwise.
  static bool SemaBuiltinRWPipe(Sema &S, CallExpr *Call) {
    // OpenCL v2.0 s6.13.16.2 - The built-in read/write
    // functions have two forms.
    switch (Call->getNumArgs()) {
    case 2:
      if (checkOpenCLPipeArg(S, Call))
        return true;
      // The call with 2 arguments should be
      // read/write_pipe(pipe T, T*).
      // Check packet type T.
      if (checkOpenCLPipePacketType(S, Call, 1))
        return true;
      break;
  
    case 4: {
      if (checkOpenCLPipeArg(S, Call))
        return true;
      // The call with 4 arguments should be
      // read/write_pipe(pipe T, reserve_id_t, uint, T*).
      // Check reserve_id_t.
      if (!Call->getArg(1)->getType()->isReserveIDT()) {
        S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
            << Call->getDirectCallee() << S.Context.OCLReserveIDTy
            << Call->getArg(1)->getType() << Call->getArg(1)->getSourceRange();
        return true;
      }
  
      // Check the index.
      const Expr *Arg2 = Call->getArg(2);
      if (!Arg2->getType()->isIntegerType() &&
          !Arg2->getType()->isUnsignedIntegerType()) {
        S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
            << Call->getDirectCallee() << S.Context.UnsignedIntTy
            << Arg2->getType() << Arg2->getSourceRange();
        return true;
      }
  
      // Check packet type T.
      if (checkOpenCLPipePacketType(S, Call, 3))
        return true;
    } break;
    default:
      S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_arg_num)
          << Call->getDirectCallee() << Call->getSourceRange();
      return true;
    }
  
    return false;
  }
  
  // Performs a semantic analysis on the {work_group_/sub_group_
  //        /_}reserve_{read/write}_pipe
  // \param S Reference to the semantic analyzer.
  // \param Call The call to the builtin function to be analyzed.
  // \return True if a semantic error was found, false otherwise.
  static bool SemaBuiltinReserveRWPipe(Sema &S, CallExpr *Call) {
    if (checkArgCount(S, Call, 2))
      return true;
  
    if (checkOpenCLPipeArg(S, Call))
      return true;
  
    // Check the reserve size.
    if (!Call->getArg(1)->getType()->isIntegerType() &&
        !Call->getArg(1)->getType()->isUnsignedIntegerType()) {
      S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
          << Call->getDirectCallee() << S.Context.UnsignedIntTy
          << Call->getArg(1)->getType() << Call->getArg(1)->getSourceRange();
      return true;
    }
  
    // Since return type of reserve_read/write_pipe built-in function is
    // reserve_id_t, which is not defined in the builtin def file , we used int
    // as return type and need to override the return type of these functions.
    Call->setType(S.Context.OCLReserveIDTy);
  
    return false;
  }
  
  // Performs a semantic analysis on {work_group_/sub_group_
  //        /_}commit_{read/write}_pipe
  // \param S Reference to the semantic analyzer.
  // \param Call The call to the builtin function to be analyzed.
  // \return True if a semantic error was found, false otherwise.
  static bool SemaBuiltinCommitRWPipe(Sema &S, CallExpr *Call) {
    if (checkArgCount(S, Call, 2))
      return true;
  
    if (checkOpenCLPipeArg(S, Call))
      return true;
  
    // Check reserve_id_t.
    if (!Call->getArg(1)->getType()->isReserveIDT()) {
      S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
          << Call->getDirectCallee() << S.Context.OCLReserveIDTy
          << Call->getArg(1)->getType() << Call->getArg(1)->getSourceRange();
      return true;
    }
  
    return false;
  }
  
  // Performs a semantic analysis on the call to built-in Pipe
  //        Query Functions.
  // \param S Reference to the semantic analyzer.
  // \param Call The call to the builtin function to be analyzed.
  // \return True if a semantic error was found, false otherwise.
  static bool SemaBuiltinPipePackets(Sema &S, CallExpr *Call) {
    if (checkArgCount(S, Call, 1))
      return true;
  
    if (!Call->getArg(0)->getType()->isPipeType()) {
      S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_first_arg)
          << Call->getDirectCallee() << Call->getArg(0)->getSourceRange();
      return true;
    }
  
    return false;
  }
  
  // OpenCL v2.0 s6.13.9 - Address space qualifier functions.
  // Performs semantic analysis for the to_global/local/private call.
  // \param S Reference to the semantic analyzer.
  // \param BuiltinID ID of the builtin function.
  // \param Call A pointer to the builtin call.
  // \return True if a semantic error has been found, false otherwise.
  static bool SemaOpenCLBuiltinToAddr(Sema &S, unsigned BuiltinID,
                                      CallExpr *Call) {
    if (Call->getNumArgs() != 1) {
      S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_to_addr_arg_num)
          << Call->getDirectCallee() << Call->getSourceRange();
      return true;
    }
  
    auto RT = Call->getArg(0)->getType();
    if (!RT->isPointerType() || RT->getPointeeType()
        .getAddressSpace() == LangAS::opencl_constant) {
      S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_to_addr_invalid_arg)
          << Call->getArg(0) << Call->getDirectCallee() << Call->getSourceRange();
      return true;
    }
  
    if (RT->getPointeeType().getAddressSpace() != LangAS::opencl_generic) {
      S.Diag(Call->getArg(0)->getBeginLoc(),
             diag::warn_opencl_generic_address_space_arg)
          << Call->getDirectCallee()->getNameInfo().getAsString()
          << Call->getArg(0)->getSourceRange();
    }
  
    RT = RT->getPointeeType();
    auto Qual = RT.getQualifiers();
    switch (BuiltinID) {
    case Builtin::BIto_global:
      Qual.setAddressSpace(LangAS::opencl_global);
      break;
    case Builtin::BIto_local:
      Qual.setAddressSpace(LangAS::opencl_local);
      break;
    case Builtin::BIto_private:
      Qual.setAddressSpace(LangAS::opencl_private);
      break;
    default:
      llvm_unreachable("Invalid builtin function");
    }
    Call->setType(S.Context.getPointerType(S.Context.getQualifiedType(
        RT.getUnqualifiedType(), Qual)));
  
    return false;
  }
  
  namespace {
    enum PointerAuthOpKind {
      PAO_Strip, PAO_Sign, PAO_Auth, PAO_SignGeneric, PAO_Discriminator,
      PAO_BlendPointer, PAO_BlendInteger
    };
  }
  
  static bool checkPointerAuthEnabled(Sema &S, Expr *E) {
    if (S.getLangOpts().PointerAuthIntrinsics)
      return false;
  
    S.diagnosePointerAuthDisabled(E->getExprLoc(), E->getSourceRange());
    return true;
  }
  
  void Sema::diagnosePointerAuthDisabled(SourceLocation loc, SourceRange range) {
    if (!getLangOpts().SoftPointerAuth &&
        !Context.getTargetInfo().isPointerAuthSupported()) {
      Diag(loc, diag::err_ptrauth_disabled_target) << range;
    } else {
      Diag(loc, diag::err_ptrauth_disabled) << range;
    }
  }
  
  static bool checkPointerAuthKey(Sema &S, Expr *&Arg) {
    // Convert it to type 'int'.
    if (convertArgumentToType(S, Arg, S.Context.IntTy))
      return true;
  
    // Value-dependent expressions are okay; wait for template instantiation.
    if (Arg->isValueDependent())
      return false;
  
    unsigned KeyValue;
    return S.checkConstantPointerAuthKey(Arg, KeyValue);
  }
  
  bool Sema::checkConstantPointerAuthKey(Expr *Arg, unsigned &Result) {
    // Attempt to constant-evaluate the expression.
    llvm::APSInt KeyValue;
    if (!Arg->isIntegerConstantExpr(KeyValue, Context)) {
      Diag(Arg->getExprLoc(), diag::err_expr_not_ice) << 0
        << Arg->getSourceRange();
      return true;
    }
  
    // Ask the target to validate the key parameter.
    if (!Context.getTargetInfo().validatePointerAuthKey(KeyValue)) {
      llvm::SmallString<32> Value; {
        llvm::raw_svector_ostream Str(Value);
        Str << KeyValue;
      }
  
      Diag(Arg->getExprLoc(), diag::err_ptrauth_invalid_key)
        << Value << Arg->getSourceRange();
      return true;
    }
  
    Result = KeyValue.getZExtValue();
    return false;
  }
  
  static std::pair<const ValueDecl *, CharUnits>
  findConstantBaseAndOffset(Sema &S, Expr *E) {
    // Must evaluate as a pointer.
    Expr::EvalResult result;
    if (!E->EvaluateAsRValue(result, S.Context) ||
        !result.Val.isLValue())
      return std::make_pair(nullptr, CharUnits());
  
    // Base must be a declaration and can't be weakly imported.
    auto baseDecl =
      result.Val.getLValueBase().dyn_cast<const ValueDecl *>();
    if (!baseDecl || baseDecl->hasAttr<WeakRefAttr>())
      return std::make_pair(nullptr, CharUnits());
  
    return std::make_pair(baseDecl, result.Val.getLValueOffset());
  }
  
  static bool checkPointerAuthValue(Sema &S, Expr *&Arg,
                                    PointerAuthOpKind OpKind,
                                    bool RequireConstant = false) {
    if (Arg->hasPlaceholderType()) {
      ExprResult R = S.CheckPlaceholderExpr(Arg);
      if (R.isInvalid()) return true;
      Arg = R.get();
    }
  
    auto allowsPointer = [](PointerAuthOpKind OpKind) {
      return OpKind != PAO_BlendInteger;
    };
    auto allowsInteger = [](PointerAuthOpKind OpKind) {
      return OpKind == PAO_Discriminator ||
             OpKind == PAO_BlendInteger ||
             OpKind == PAO_SignGeneric;
    };
  
    // Require the value to have the right range of type.
    QualType ExpectedTy;
    if (allowsPointer(OpKind) && Arg->getType()->isPointerType()) {
      ExpectedTy = Arg->getType().getUnqualifiedType();
    } else if (allowsPointer(OpKind) && Arg->getType()->isNullPtrType()) {
      ExpectedTy = S.Context.VoidPtrTy;
    } else if (allowsInteger(OpKind) &&
               Arg->getType()->isIntegralOrUnscopedEnumerationType()) {
      ExpectedTy = S.Context.getUIntPtrType();
  
    // Diagnose the failures.
    } else {
      S.Diag(Arg->getExprLoc(), diag::err_ptrauth_value_bad_type)
        << unsigned(OpKind == PAO_Discriminator ? 1 :
                    OpKind == PAO_BlendPointer ? 2 :
                    OpKind == PAO_BlendInteger ? 3 : 0)
        << unsigned(allowsInteger(OpKind) ?
                      (allowsPointer(OpKind) ? 2 : 1) : 0)
        << Arg->getType()
        << Arg->getSourceRange();
      return true;
    }
  
    // Convert to that type.  This should just be an lvalue-to-rvalue
    // conversion.
    if (convertArgumentToType(S, Arg, ExpectedTy))
      return true;
  
    if (!RequireConstant) {
      // Warn about null pointers for non-generic sign and auth operations.
      if ((OpKind == PAO_Sign || OpKind == PAO_Auth) &&
          Arg->isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNull)) {
        S.Diag(Arg->getExprLoc(),
               OpKind == PAO_Sign ? diag::warn_ptrauth_sign_null_pointer
                                  : diag::warn_ptrauth_auth_null_pointer)
          << Arg->getSourceRange();
      }
  
      return false;
    }
  
    // Perform special checking on the arguments to ptrauth_sign_constant.
  
    // The main argument.
    if (OpKind == PAO_Sign) {
      // Require the value we're signing to have a special form.
      auto result = findConstantBaseAndOffset(S, Arg);
      bool invalid;
  
      // Must be rooted in a declaration reference.
      if (!result.first) {
        invalid = true;
  
      // If it's a function declaration, we can't have an offset.
      } else if (isa<FunctionDecl>(result.first)) {
        invalid = !result.second.isZero();
  
      // Otherwise we're fine.
      } else {
        invalid = false;
      }
  
      if (invalid) {
        S.Diag(Arg->getExprLoc(), diag::err_ptrauth_bad_constant_pointer);
      }
      return invalid;
    }
  
    // The discriminator argument.
    assert(OpKind == PAO_Discriminator);
  
    // Must be a pointer or integer or blend thereof.
    Expr *pointer = nullptr;
    Expr *integer = nullptr;
    if (auto call = dyn_cast<CallExpr>(Arg->IgnoreParens())) {
      if (call->getBuiltinCallee() ==
            Builtin::BI__builtin_ptrauth_blend_discriminator) {
        pointer = call->getArg(0);
        integer = call->getArg(1);
      }
    }
    if (!pointer && !integer) {
      if (Arg->getType()->isPointerType())
        pointer = Arg;
      else
        integer = Arg;
    }
  
    // Check the pointer.
    bool invalid = false;
    if (pointer) {
      assert(pointer->getType()->isPointerType());
  
      // TODO: if we're initializing a global, check that the address is
      // somehow related to what we're initializing.  This probably will
      // never really be feasible and we'll have to catch it at link-time.
      auto result = findConstantBaseAndOffset(S, pointer);
      if (!result.first || !isa<VarDecl>(result.first)) {
        invalid = true;
      }
    }
  
    // Check the integer.
    if (integer) {
      assert(integer->getType()->isIntegerType());
      if (!integer->isEvaluatable(S.Context))
        invalid = true;
    }
  
    if (invalid) {
      S.Diag(Arg->getExprLoc(), diag::err_ptrauth_bad_constant_discriminator);
    }
    return invalid;
  }
  
  static ExprResult SemaPointerAuthStrip(Sema &S, CallExpr *Call) {
    if (checkArgCount(S, Call, 2)) return ExprError();
    if (checkPointerAuthEnabled(S, Call)) return ExprError();
    if (checkPointerAuthValue(S, Call->getArgs()[0], PAO_Strip) |
        checkPointerAuthKey(S, Call->getArgs()[1]))
      return ExprError();
  
    Call->setType(Call->getArgs()[0]->getType());
    return Call;
  }
  
  static ExprResult SemaPointerAuthBlendDiscriminator(Sema &S, CallExpr *Call) {
    if (checkArgCount(S, Call, 2)) return ExprError();
    if (checkPointerAuthEnabled(S, Call)) return ExprError();
    if (checkPointerAuthValue(S, Call->getArgs()[0], PAO_BlendPointer) |
        checkPointerAuthValue(S, Call->getArgs()[1], PAO_BlendInteger))
      return ExprError();
  
    Call->setType(S.Context.getUIntPtrType());
    return Call;
  }
  
  static ExprResult SemaPointerAuthSignGenericData(Sema &S, CallExpr *Call) {
    if (checkArgCount(S, Call, 2)) return ExprError();
    if (checkPointerAuthEnabled(S, Call)) return ExprError();
    if (checkPointerAuthValue(S, Call->getArgs()[0], PAO_SignGeneric) |
        checkPointerAuthValue(S, Call->getArgs()[1], PAO_Discriminator))
      return ExprError();
  
    Call->setType(S.Context.getUIntPtrType());
    return Call;
  }
  
  static ExprResult SemaPointerAuthSignOrAuth(Sema &S, CallExpr *Call,
                                              PointerAuthOpKind OpKind,
                                              bool RequireConstant) {
    if (checkArgCount(S, Call, 3)) return ExprError();
    if (checkPointerAuthEnabled(S, Call)) return ExprError();
    if (checkPointerAuthValue(S, Call->getArgs()[0], OpKind, RequireConstant) |
        checkPointerAuthKey(S, Call->getArgs()[1]) |
        checkPointerAuthValue(S, Call->getArgs()[2], PAO_Discriminator,
                              RequireConstant))
      return ExprError();
  
    Call->setType(Call->getArgs()[0]->getType());
    return Call;
  }
  
  static ExprResult SemaPointerAuthAuthAndResign(Sema &S, CallExpr *Call) {
    if (checkArgCount(S, Call, 5)) return ExprError();
    if (checkPointerAuthEnabled(S, Call)) return ExprError();
    if (checkPointerAuthValue(S, Call->getArgs()[0], PAO_Auth) |
        checkPointerAuthKey(S, Call->getArgs()[1]) |
        checkPointerAuthValue(S, Call->getArgs()[2], PAO_Discriminator) |
        checkPointerAuthKey(S, Call->getArgs()[3]) |
        checkPointerAuthValue(S, Call->getArgs()[4], PAO_Discriminator))
      return ExprError();
  
    Call->setType(Call->getArgs()[0]->getType());
    return Call;
  }
  
  static ExprResult SemaPointerAuthStringDiscriminator(Sema &S, CallExpr *call) {
    if (checkPointerAuthEnabled(S, call)) return ExprError();
  
    // We've already performed normal call type-checking.
    Expr *arg = call->getArgs()[0]->IgnoreParenImpCasts();
  
    // Operand must be an ordinary or UTF-8 string literal.
    auto literal = dyn_cast<StringLiteral>(arg);
    if (!literal || literal->getCharByteWidth() != 1) {
      S.Diag(arg->getExprLoc(), diag::err_ptrauth_string_not_literal)
        << (literal ? 1 : 0)
        << arg->getSourceRange();
      return ExprError();
    }
  
    return call;
  }
  
  
  static ExprResult SemaBuiltinLaunder(Sema &S, CallExpr *TheCall) {
    if (checkArgCount(S, TheCall, 1))
      return ExprError();
  
    // Compute __builtin_launder's parameter type from the argument.
    // The parameter type is:
    //  * The type of the argument if it's not an array or function type,
    //  Otherwise,
    //  * The decayed argument type.
    QualType ParamTy = [&]() {
      QualType ArgTy = TheCall->getArg(0)->getType();
      if (const ArrayType *Ty = ArgTy->getAsArrayTypeUnsafe())
        return S.Context.getPointerType(Ty->getElementType());
      if (ArgTy->isFunctionType()) {
        return S.Context.getPointerType(ArgTy);
      }
      return ArgTy;
    }();
  
    TheCall->setType(ParamTy);
  
    auto DiagSelect = [&]() -> llvm::Optional<unsigned> {
      if (!ParamTy->isPointerType())
        return 0;
      if (ParamTy->isFunctionPointerType())
        return 1;
      if (ParamTy->isVoidPointerType())
        return 2;
      return llvm::Optional<unsigned>{};
    }();
    if (DiagSelect.hasValue()) {
      S.Diag(TheCall->getBeginLoc(), diag::err_builtin_launder_invalid_arg)
          << DiagSelect.getValue() << TheCall->getSourceRange();
      return ExprError();
    }
  
    // We either have an incomplete class type, or we have a class template
    // whose instantiation has not been forced. Example:
    //
    //   template <class T> struct Foo { T value; };
    //   Foo<int> *p = nullptr;
    //   auto *d = __builtin_launder(p);
    if (S.RequireCompleteType(TheCall->getBeginLoc(), ParamTy->getPointeeType(),
                              diag::err_incomplete_type))
      return ExprError();
  
    assert(ParamTy->getPointeeType()->isObjectType() &&
           "Unhandled non-object pointer case");
  
    InitializedEntity Entity =
        InitializedEntity::InitializeParameter(S.Context, ParamTy, false);
    ExprResult Arg =
        S.PerformCopyInitialization(Entity, SourceLocation(), TheCall->getArg(0));
    if (Arg.isInvalid())
      return ExprError();
    TheCall->setArg(0, Arg.get());
  
    return TheCall;
  }
  
  // Emit an error and return true if the current architecture is not in the list
  // of supported architectures.
  static bool
  CheckBuiltinTargetSupport(Sema &S, unsigned BuiltinID, CallExpr *TheCall,
                            ArrayRef<llvm::Triple::ArchType> SupportedArchs) {
    llvm::Triple::ArchType CurArch =
        S.getASTContext().getTargetInfo().getTriple().getArch();
    if (llvm::is_contained(SupportedArchs, CurArch))
      return false;
    S.Diag(TheCall->getBeginLoc(), diag::err_builtin_target_unsupported)
        << TheCall->getSourceRange();
    return true;
  }
  
  ExprResult
  Sema::CheckBuiltinFunctionCall(FunctionDecl *FDecl, unsigned BuiltinID,
                                 CallExpr *TheCall) {
    ExprResult TheCallResult(TheCall);
  
    // Find out if any arguments are required to be integer constant expressions.
    unsigned ICEArguments = 0;
    ASTContext::GetBuiltinTypeError Error;
    Context.GetBuiltinType(BuiltinID, Error, &ICEArguments);
    if (Error != ASTContext::GE_None)
      ICEArguments = 0;  // Don't diagnose previously diagnosed errors.
  
    // If any arguments are required to be ICE's, check and diagnose.
    for (unsigned ArgNo = 0; ICEArguments != 0; ++ArgNo) {
      // Skip arguments not required to be ICE's.
      if ((ICEArguments & (1 << ArgNo)) == 0) continue;
  
      llvm::APSInt Result;
      if (SemaBuiltinConstantArg(TheCall, ArgNo, Result))
        return true;
      ICEArguments &= ~(1 << ArgNo);
    }
  
    switch (BuiltinID) {
    case Builtin::BI__builtin___CFStringMakeConstantString:
      assert(TheCall->getNumArgs() == 1 &&
             "Wrong # arguments to builtin CFStringMakeConstantString");
      if (CheckObjCString(TheCall->getArg(0)))
        return ExprError();
      break;
    case Builtin::BI__builtin_ms_va_start:
    case Builtin::BI__builtin_stdarg_start:
    case Builtin::BI__builtin_va_start:
      if (SemaBuiltinVAStart(BuiltinID, TheCall))
        return ExprError();
      break;
    case Builtin::BI__va_start: {
      switch (Context.getTargetInfo().getTriple().getArch()) {
      case llvm::Triple::aarch64:
      case llvm::Triple::arm:
      case llvm::Triple::thumb:
        if (SemaBuiltinVAStartARMMicrosoft(TheCall))
          return ExprError();
        break;
      default:
        if (SemaBuiltinVAStart(BuiltinID, TheCall))
          return ExprError();
        break;
      }
      break;
    }
  
    // The acquire, release, and no fence variants are ARM and AArch64 only.
    case Builtin::BI_interlockedbittestandset_acq:
    case Builtin::BI_interlockedbittestandset_rel:
    case Builtin::BI_interlockedbittestandset_nf:
    case Builtin::BI_interlockedbittestandreset_acq:
    case Builtin::BI_interlockedbittestandreset_rel:
    case Builtin::BI_interlockedbittestandreset_nf:
      if (CheckBuiltinTargetSupport(
              *this, BuiltinID, TheCall,
              {llvm::Triple::arm, llvm::Triple::thumb, llvm::Triple::aarch64}))
        return ExprError();
      break;
  
    // The 64-bit bittest variants are x64, ARM, and AArch64 only.
    case Builtin::BI_bittest64:
    case Builtin::BI_bittestandcomplement64:
    case Builtin::BI_bittestandreset64:
    case Builtin::BI_bittestandset64:
    case Builtin::BI_interlockedbittestandreset64:
    case Builtin::BI_interlockedbittestandset64:
      if (CheckBuiltinTargetSupport(*this, BuiltinID, TheCall,
                                    {llvm::Triple::x86_64, llvm::Triple::arm,
                                     llvm::Triple::thumb, llvm::Triple::aarch64}))
        return ExprError();
      break;
  
    case Builtin::BI__builtin_isgreater:
    case Builtin::BI__builtin_isgreaterequal:
    case Builtin::BI__builtin_isless:
    case Builtin::BI__builtin_islessequal:
    case Builtin::BI__builtin_islessgreater:
    case Builtin::BI__builtin_isunordered:
      if (SemaBuiltinUnorderedCompare(TheCall))
        return ExprError();
      break;
    case Builtin::BI__builtin_fpclassify:
      if (SemaBuiltinFPClassification(TheCall, 6))
        return ExprError();
      break;
    case Builtin::BI__builtin_isfinite:
    case Builtin::BI__builtin_isinf:
    case Builtin::BI__builtin_isinf_sign:
    case Builtin::BI__builtin_isnan:
    case Builtin::BI__builtin_isnormal:
    case Builtin::BI__builtin_signbit:
    case Builtin::BI__builtin_signbitf:
    case Builtin::BI__builtin_signbitl:
      if (SemaBuiltinFPClassification(TheCall, 1))
        return ExprError();
      break;
    case Builtin::BI__builtin_shufflevector:
      return SemaBuiltinShuffleVector(TheCall);
      // TheCall will be freed by the smart pointer here, but that's fine, since
      // SemaBuiltinShuffleVector guts it, but then doesn't release it.
    case Builtin::BI__builtin_prefetch:
      if (SemaBuiltinPrefetch(TheCall))
        return ExprError();
      break;
    case Builtin::BI__builtin_alloca_with_align:
      if (SemaBuiltinAllocaWithAlign(TheCall))
        return ExprError();
      LLVM_FALLTHROUGH;
    case Builtin::BI__builtin_alloca:
      Diag(TheCall->getBeginLoc(), diag::warn_alloca)
          << TheCall->getDirectCallee();
      break;
    case Builtin::BI__assume:
    case Builtin::BI__builtin_assume:
      if (SemaBuiltinAssume(TheCall))
        return ExprError();
      break;
    case Builtin::BI__builtin_assume_aligned:
      if (SemaBuiltinAssumeAligned(TheCall))
        return ExprError();
      break;
    case Builtin::BI__builtin_dynamic_object_size:
    case Builtin::BI__builtin_object_size:
      if (SemaBuiltinConstantArgRange(TheCall, 1, 0, 3))
        return ExprError();
      break;
    case Builtin::BI__builtin_longjmp:
      if (SemaBuiltinLongjmp(TheCall))
        return ExprError();
      break;
    case Builtin::BI__builtin_setjmp:
      if (SemaBuiltinSetjmp(TheCall))
        return ExprError();
      break;
    case Builtin::BI_setjmp:
    case Builtin::BI_setjmpex:
      if (checkArgCount(*this, TheCall, 1))
        return true;
      break;
    case Builtin::BI__builtin_classify_type:
      if (checkArgCount(*this, TheCall, 1)) return true;
      TheCall->setType(Context.IntTy);
      break;
    case Builtin::BI__builtin_constant_p: {
      if (checkArgCount(*this, TheCall, 1)) return true;
      ExprResult Arg = DefaultFunctionArrayLvalueConversion(TheCall->getArg(0));
      if (Arg.isInvalid()) return true;
      TheCall->setArg(0, Arg.get());
      TheCall->setType(Context.IntTy);
      break;
    }
    case Builtin::BI__builtin_launder:
      return SemaBuiltinLaunder(*this, TheCall);
    case Builtin::BI__sync_fetch_and_add:
    case Builtin::BI__sync_fetch_and_add_1:
    case Builtin::BI__sync_fetch_and_add_2:
    case Builtin::BI__sync_fetch_and_add_4:
    case Builtin::BI__sync_fetch_and_add_8:
    case Builtin::BI__sync_fetch_and_add_16:
    case Builtin::BI__sync_fetch_and_sub:
    case Builtin::BI__sync_fetch_and_sub_1:
    case Builtin::BI__sync_fetch_and_sub_2:
    case Builtin::BI__sync_fetch_and_sub_4:
    case Builtin::BI__sync_fetch_and_sub_8:
    case Builtin::BI__sync_fetch_and_sub_16:
    case Builtin::BI__sync_fetch_and_or:
    case Builtin::BI__sync_fetch_and_or_1:
    case Builtin::BI__sync_fetch_and_or_2:
    case Builtin::BI__sync_fetch_and_or_4:
    case Builtin::BI__sync_fetch_and_or_8:
    case Builtin::BI__sync_fetch_and_or_16:
    case Builtin::BI__sync_fetch_and_and:
    case Builtin::BI__sync_fetch_and_and_1:
    case Builtin::BI__sync_fetch_and_and_2:
    case Builtin::BI__sync_fetch_and_and_4:
    case Builtin::BI__sync_fetch_and_and_8:
    case Builtin::BI__sync_fetch_and_and_16:
    case Builtin::BI__sync_fetch_and_xor:
    case Builtin::BI__sync_fetch_and_xor_1:
    case Builtin::BI__sync_fetch_and_xor_2:
    case Builtin::BI__sync_fetch_and_xor_4:
    case Builtin::BI__sync_fetch_and_xor_8:
    case Builtin::BI__sync_fetch_and_xor_16:
    case Builtin::BI__sync_fetch_and_nand:
    case Builtin::BI__sync_fetch_and_nand_1:
    case Builtin::BI__sync_fetch_and_nand_2:
    case Builtin::BI__sync_fetch_and_nand_4:
    case Builtin::BI__sync_fetch_and_nand_8:
    case Builtin::BI__sync_fetch_and_nand_16:
    case Builtin::BI__sync_add_and_fetch:
    case Builtin::BI__sync_add_and_fetch_1:
    case Builtin::BI__sync_add_and_fetch_2:
    case Builtin::BI__sync_add_and_fetch_4:
    case Builtin::BI__sync_add_and_fetch_8:
    case Builtin::BI__sync_add_and_fetch_16:
    case Builtin::BI__sync_sub_and_fetch:
    case Builtin::BI__sync_sub_and_fetch_1:
    case Builtin::BI__sync_sub_and_fetch_2:
    case Builtin::BI__sync_sub_and_fetch_4:
    case Builtin::BI__sync_sub_and_fetch_8:
    case Builtin::BI__sync_sub_and_fetch_16:
    case Builtin::BI__sync_and_and_fetch:
    case Builtin::BI__sync_and_and_fetch_1:
    case Builtin::BI__sync_and_and_fetch_2:
    case Builtin::BI__sync_and_and_fetch_4:
    case Builtin::BI__sync_and_and_fetch_8:
    case Builtin::BI__sync_and_and_fetch_16:
    case Builtin::BI__sync_or_and_fetch:
    case Builtin::BI__sync_or_and_fetch_1:
    case Builtin::BI__sync_or_and_fetch_2:
    case Builtin::BI__sync_or_and_fetch_4:
    case Builtin::BI__sync_or_and_fetch_8:
    case Builtin::BI__sync_or_and_fetch_16:
    case Builtin::BI__sync_xor_and_fetch:
    case Builtin::BI__sync_xor_and_fetch_1:
    case Builtin::BI__sync_xor_and_fetch_2:
    case Builtin::BI__sync_xor_and_fetch_4:
    case Builtin::BI__sync_xor_and_fetch_8:
    case Builtin::BI__sync_xor_and_fetch_16:
    case Builtin::BI__sync_nand_and_fetch:
    case Builtin::BI__sync_nand_and_fetch_1:
    case Builtin::BI__sync_nand_and_fetch_2:
    case Builtin::BI__sync_nand_and_fetch_4:
    case Builtin::BI__sync_nand_and_fetch_8:
    case Builtin::BI__sync_nand_and_fetch_16:
    case Builtin::BI__sync_val_compare_and_swap:
    case Builtin::BI__sync_val_compare_and_swap_1:
    case Builtin::BI__sync_val_compare_and_swap_2:
    case Builtin::BI__sync_val_compare_and_swap_4:
    case Builtin::BI__sync_val_compare_and_swap_8:
    case Builtin::BI__sync_val_compare_and_swap_16:
    case Builtin::BI__sync_bool_compare_and_swap:
    case Builtin::BI__sync_bool_compare_and_swap_1:
    case Builtin::BI__sync_bool_compare_and_swap_2:
    case Builtin::BI__sync_bool_compare_and_swap_4:
    case Builtin::BI__sync_bool_compare_and_swap_8:
    case Builtin::BI__sync_bool_compare_and_swap_16:
    case Builtin::BI__sync_lock_test_and_set:
    case Builtin::BI__sync_lock_test_and_set_1:
    case Builtin::BI__sync_lock_test_and_set_2:
    case Builtin::BI__sync_lock_test_and_set_4:
    case Builtin::BI__sync_lock_test_and_set_8:
    case Builtin::BI__sync_lock_test_and_set_16:
    case Builtin::BI__sync_lock_release:
    case Builtin::BI__sync_lock_release_1:
    case Builtin::BI__sync_lock_release_2:
    case Builtin::BI__sync_lock_release_4:
    case Builtin::BI__sync_lock_release_8:
    case Builtin::BI__sync_lock_release_16:
    case Builtin::BI__sync_swap:
    case Builtin::BI__sync_swap_1:
    case Builtin::BI__sync_swap_2:
    case Builtin::BI__sync_swap_4:
    case Builtin::BI__sync_swap_8:
    case Builtin::BI__sync_swap_16:
      return SemaBuiltinAtomicOverloaded(TheCallResult);
    case Builtin::BI__sync_synchronize:
      Diag(TheCall->getBeginLoc(), diag::warn_atomic_implicit_seq_cst)
          << TheCall->getCallee()->getSourceRange();
      break;
    case Builtin::BI__builtin_nontemporal_load:
    case Builtin::BI__builtin_nontemporal_store:
      return SemaBuiltinNontemporalOverloaded(TheCallResult);
  #define BUILTIN(ID, TYPE, ATTRS)
  #define ATOMIC_BUILTIN(ID, TYPE, ATTRS) \
    case Builtin::BI##ID: \
      return SemaAtomicOpsOverloaded(TheCallResult, AtomicExpr::AO##ID);
  #include "clang/Basic/Builtins.def"
    case Builtin::BI__annotation:
      if (SemaBuiltinMSVCAnnotation(*this, TheCall))
        return ExprError();
      break;
    case Builtin::BI__builtin_annotation:
      if (SemaBuiltinAnnotation(*this, TheCall))
        return ExprError();
      break;
    case Builtin::BI__builtin_addressof:
      if (SemaBuiltinAddressof(*this, TheCall))
        return ExprError();
      break;
    case Builtin::BI__builtin_add_overflow:
    case Builtin::BI__builtin_sub_overflow:
    case Builtin::BI__builtin_mul_overflow:
      if (SemaBuiltinOverflow(*this, TheCall))
        return ExprError();
      break;
    case Builtin::BI__builtin_operator_new:
    case Builtin::BI__builtin_operator_delete: {
      bool IsDelete = BuiltinID == Builtin::BI__builtin_operator_delete;
      ExprResult Res =
          SemaBuiltinOperatorNewDeleteOverloaded(TheCallResult, IsDelete);
      if (Res.isInvalid())
        CorrectDelayedTyposInExpr(TheCallResult.get());
      return Res;
    }
    case Builtin::BI__builtin_dump_struct: {
      // We first want to ensure we are called with 2 arguments
      if (checkArgCount(*this, TheCall, 2))
        return ExprError();
      // Ensure that the first argument is of type 'struct XX *'
      const Expr *PtrArg = TheCall->getArg(0)->IgnoreParenImpCasts();
      const QualType PtrArgType = PtrArg->getType();
      if (!PtrArgType->isPointerType() ||
          !PtrArgType->getPointeeType()->isRecordType()) {
        Diag(PtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
            << PtrArgType << "structure pointer" << 1 << 0 << 3 << 1 << PtrArgType
            << "structure pointer";
        return ExprError();
      }
  
      // Ensure that the second argument is of type 'FunctionType'
      const Expr *FnPtrArg = TheCall->getArg(1)->IgnoreImpCasts();
      const QualType FnPtrArgType = FnPtrArg->getType();
      if (!FnPtrArgType->isPointerType()) {
        Diag(FnPtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
            << FnPtrArgType << "'int (*)(const char *, ...)'" << 1 << 0 << 3 << 2
            << FnPtrArgType << "'int (*)(const char *, ...)'";
        return ExprError();
      }
  
      const auto *FuncType =
          FnPtrArgType->getPointeeType()->getAs<FunctionType>();
  
      if (!FuncType) {
        Diag(FnPtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
            << FnPtrArgType << "'int (*)(const char *, ...)'" << 1 << 0 << 3 << 2
            << FnPtrArgType << "'int (*)(const char *, ...)'";
        return ExprError();
      }
  
      if (const auto *FT = dyn_cast<FunctionProtoType>(FuncType)) {
        if (!FT->getNumParams()) {
          Diag(FnPtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
              << FnPtrArgType << "'int (*)(const char *, ...)'" << 1 << 0 << 3
              << 2 << FnPtrArgType << "'int (*)(const char *, ...)'";
          return ExprError();
        }
        QualType PT = FT->getParamType(0);
        if (!FT->isVariadic() || FT->getReturnType() != Context.IntTy ||
            !PT->isPointerType() || !PT->getPointeeType()->isCharType() ||
            !PT->getPointeeType().isConstQualified()) {
          Diag(FnPtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
              << FnPtrArgType << "'int (*)(const char *, ...)'" << 1 << 0 << 3
              << 2 << FnPtrArgType << "'int (*)(const char *, ...)'";
          return ExprError();
        }
      }
  
      TheCall->setType(Context.IntTy);
      break;
    }
    case Builtin::BI__builtin_preserve_access_index:
      if (SemaBuiltinPreserveAI(*this, TheCall))
        return ExprError();
      break;
    case Builtin::BI__builtin_call_with_static_chain:
      if (SemaBuiltinCallWithStaticChain(*this, TheCall))
        return ExprError();
      break;
    case Builtin::BI__exception_code:
    case Builtin::BI_exception_code:
      if (SemaBuiltinSEHScopeCheck(*this, TheCall, Scope::SEHExceptScope,
                                   diag::err_seh___except_block))
        return ExprError();
      break;
    case Builtin::BI__exception_info:
    case Builtin::BI_exception_info:
      if (SemaBuiltinSEHScopeCheck(*this, TheCall, Scope::SEHFilterScope,
                                   diag::err_seh___except_filter))
        return ExprError();
      break;
    case Builtin::BI__GetExceptionInfo:
      if (checkArgCount(*this, TheCall, 1))
        return ExprError();
  
      if (CheckCXXThrowOperand(
              TheCall->getBeginLoc(),
              Context.getExceptionObjectType(FDecl->getParamDecl(0)->getType()),
              TheCall))
        return ExprError();
  
      TheCall->setType(Context.VoidPtrTy);
      break;
    case Builtin::BI__builtin_ptrauth_strip:
      return SemaPointerAuthStrip(*this, TheCall);
    case Builtin::BI__builtin_ptrauth_blend_discriminator:
      return SemaPointerAuthBlendDiscriminator(*this, TheCall);
    case Builtin::BI__builtin_ptrauth_sign_constant:
      return SemaPointerAuthSignOrAuth(*this, TheCall, PAO_Sign,
                                       /*constant*/ true);
    case Builtin::BI__builtin_ptrauth_sign_unauthenticated:
      return SemaPointerAuthSignOrAuth(*this, TheCall, PAO_Sign,
                                       /*constant*/ false);
    case Builtin::BI__builtin_ptrauth_auth:
      return SemaPointerAuthSignOrAuth(*this, TheCall, PAO_Auth,
                                       /*constant*/ false);
    case Builtin::BI__builtin_ptrauth_sign_generic_data:
      return SemaPointerAuthSignGenericData(*this, TheCall);
    case Builtin::BI__builtin_ptrauth_auth_and_resign:
      return SemaPointerAuthAuthAndResign(*this, TheCall);
    case Builtin::BI__builtin_ptrauth_string_discriminator:
      return SemaPointerAuthStringDiscriminator(*this, TheCall);
    // OpenCL v2.0, s6.13.16 - Pipe functions
    case Builtin::BIread_pipe:
    case Builtin::BIwrite_pipe:
      // Since those two functions are declared with var args, we need a semantic
      // check for the argument.
      if (SemaBuiltinRWPipe(*this, TheCall))
        return ExprError();
      break;
    case Builtin::BIreserve_read_pipe:
    case Builtin::BIreserve_write_pipe:
    case Builtin::BIwork_group_reserve_read_pipe:
    case Builtin::BIwork_group_reserve_write_pipe:
      if (SemaBuiltinReserveRWPipe(*this, TheCall))
        return ExprError();
      break;
    case Builtin::BIsub_group_reserve_read_pipe:
    case Builtin::BIsub_group_reserve_write_pipe:
      if (checkOpenCLSubgroupExt(*this, TheCall) ||
          SemaBuiltinReserveRWPipe(*this, TheCall))
        return ExprError();
      break;
    case Builtin::BIcommit_read_pipe:
    case Builtin::BIcommit_write_pipe:
    case Builtin::BIwork_group_commit_read_pipe:
    case Builtin::BIwork_group_commit_write_pipe:
      if (SemaBuiltinCommitRWPipe(*this, TheCall))
        return ExprError();
      break;
    case Builtin::BIsub_group_commit_read_pipe:
    case Builtin::BIsub_group_commit_write_pipe:
      if (checkOpenCLSubgroupExt(*this, TheCall) ||
          SemaBuiltinCommitRWPipe(*this, TheCall))
        return ExprError();
      break;
    case Builtin::BIget_pipe_num_packets:
    case Builtin::BIget_pipe_max_packets:
      if (SemaBuiltinPipePackets(*this, TheCall))
        return ExprError();
      break;
    case Builtin::BIto_global:
    case Builtin::BIto_local:
    case Builtin::BIto_private:
      if (SemaOpenCLBuiltinToAddr(*this, BuiltinID, TheCall))
        return ExprError();
      break;
    // OpenCL v2.0, s6.13.17 - Enqueue kernel functions.
    case Builtin::BIenqueue_kernel:
      if (SemaOpenCLBuiltinEnqueueKernel(*this, TheCall))
        return ExprError();
      break;
    case Builtin::BIget_kernel_work_group_size:
    case Builtin::BIget_kernel_preferred_work_group_size_multiple:
      if (SemaOpenCLBuiltinKernelWorkGroupSize(*this, TheCall))
        return ExprError();
      break;
    case Builtin::BIget_kernel_max_sub_group_size_for_ndrange:
    case Builtin::BIget_kernel_sub_group_count_for_ndrange:
      if (SemaOpenCLBuiltinNDRangeAndBlock(*this, TheCall))
        return ExprError();
      break;
    case Builtin::BI__builtin_os_log_format:
      Cleanup.setExprNeedsCleanups(true);
      LLVM_FALLTHROUGH;
    case Builtin::BI__builtin_os_log_format_buffer_size:
      if (SemaBuiltinOSLogFormat(TheCall))
        return ExprError();
      break;
    }
  
    // Since the target specific builtins for each arch overlap, only check those
    // of the arch we are compiling for.
    if (Context.BuiltinInfo.isTSBuiltin(BuiltinID)) {
      switch (Context.getTargetInfo().getTriple().getArch()) {
        case llvm::Triple::arm:
        case llvm::Triple::armeb:
        case llvm::Triple::thumb:
        case llvm::Triple::thumbeb:
          if (CheckARMBuiltinFunctionCall(BuiltinID, TheCall))
            return ExprError();
          break;
        case llvm::Triple::aarch64:
        case llvm::Triple::aarch64_32:
        case llvm::Triple::aarch64_be:
          if (CheckAArch64BuiltinFunctionCall(BuiltinID, TheCall))
            return ExprError();
          break;
        case llvm::Triple::bpfeb:
        case llvm::Triple::bpfel:
          if (CheckBPFBuiltinFunctionCall(BuiltinID, TheCall))
            return ExprError();
          break;
        case llvm::Triple::hexagon:
          if (CheckHexagonBuiltinFunctionCall(BuiltinID, TheCall))
            return ExprError();
          break;
        case llvm::Triple::mips:
        case llvm::Triple::mipsel:
        case llvm::Triple::mips64:
        case llvm::Triple::mips64el:
          if (CheckMipsBuiltinFunctionCall(BuiltinID, TheCall))
            return ExprError();
          break;
        case llvm::Triple::systemz:
          if (CheckSystemZBuiltinFunctionCall(BuiltinID, TheCall))
            return ExprError();
          break;
        case llvm::Triple::x86:
        case llvm::Triple::x86_64:
          if (CheckX86BuiltinFunctionCall(BuiltinID, TheCall))
            return ExprError();
          break;
        case llvm::Triple::ppc:
        case llvm::Triple::ppc64:
        case llvm::Triple::ppc64le:
          if (CheckPPCBuiltinFunctionCall(BuiltinID, TheCall))
            return ExprError();
          break;
        default:
          break;
      }
    }
  
    return TheCallResult;
  }
  
  // Get the valid immediate range for the specified NEON type code.
  static unsigned RFT(unsigned t, bool shift = false, bool ForceQuad = false) {
    NeonTypeFlags Type(t);
    int IsQuad = ForceQuad ? true : Type.isQuad();
    switch (Type.getEltType()) {
    case NeonTypeFlags::Int8:
    case NeonTypeFlags::Poly8:
      return shift ? 7 : (8 << IsQuad) - 1;
    case NeonTypeFlags::Int16:
    case NeonTypeFlags::Poly16:
      return shift ? 15 : (4 << IsQuad) - 1;
    case NeonTypeFlags::Int32:
      return shift ? 31 : (2 << IsQuad) - 1;
    case NeonTypeFlags::Int64:
    case NeonTypeFlags::Poly64:
      return shift ? 63 : (1 << IsQuad) - 1;
    case NeonTypeFlags::Poly128:
      return shift ? 127 : (1 << IsQuad) - 1;
    case NeonTypeFlags::Float16:
      assert(!shift && "cannot shift float types!");
      return (4 << IsQuad) - 1;
    case NeonTypeFlags::Float32:
      assert(!shift && "cannot shift float types!");
      return (2 << IsQuad) - 1;
    case NeonTypeFlags::Float64:
      assert(!shift && "cannot shift float types!");
      return (1 << IsQuad) - 1;
    }
    llvm_unreachable("Invalid NeonTypeFlag!");
  }
  
  /// getNeonEltType - Return the QualType corresponding to the elements of
  /// the vector type specified by the NeonTypeFlags.  This is used to check
  /// the pointer arguments for Neon load/store intrinsics.
  static QualType getNeonEltType(NeonTypeFlags Flags, ASTContext &Context,
                                 bool IsPolyUnsigned, bool IsInt64Long) {
    switch (Flags.getEltType()) {
    case NeonTypeFlags::Int8:
      return Flags.isUnsigned() ? Context.UnsignedCharTy : Context.SignedCharTy;
    case NeonTypeFlags::Int16:
      return Flags.isUnsigned() ? Context.UnsignedShortTy : Context.ShortTy;
    case NeonTypeFlags::Int32:
      return Flags.isUnsigned() ? Context.UnsignedIntTy : Context.IntTy;
    case NeonTypeFlags::Int64:
      if (IsInt64Long)
        return Flags.isUnsigned() ? Context.UnsignedLongTy : Context.LongTy;
      else
        return Flags.isUnsigned() ? Context.UnsignedLongLongTy
                                  : Context.LongLongTy;
    case NeonTypeFlags::Poly8:
      return IsPolyUnsigned ? Context.UnsignedCharTy : Context.SignedCharTy;
    case NeonTypeFlags::Poly16:
      return IsPolyUnsigned ? Context.UnsignedShortTy : Context.ShortTy;
    case NeonTypeFlags::Poly64:
      if (IsInt64Long)
        return Context.UnsignedLongTy;
      else
        return Context.UnsignedLongLongTy;
    case NeonTypeFlags::Poly128:
      break;
    case NeonTypeFlags::Float16:
      return Context.HalfTy;
    case NeonTypeFlags::Float32:
      return Context.FloatTy;
    case NeonTypeFlags::Float64:
      return Context.DoubleTy;
    }
    llvm_unreachable("Invalid NeonTypeFlag!");
  }
  
  bool Sema::CheckNeonBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
    llvm::APSInt Result;
    uint64_t mask = 0;
    unsigned TV = 0;
    int PtrArgNum = -1;
    bool HasConstPtr = false;
    switch (BuiltinID) {
  #define GET_NEON_OVERLOAD_CHECK
  #include "clang/Basic/arm_neon.inc"
  #include "clang/Basic/arm_fp16.inc"
  #undef GET_NEON_OVERLOAD_CHECK
    }
  
    // For NEON intrinsics which are overloaded on vector element type, validate
    // the immediate which specifies which variant to emit.
    unsigned ImmArg = TheCall->getNumArgs()-1;
    if (mask) {
      if (SemaBuiltinConstantArg(TheCall, ImmArg, Result))
        return true;
  
      TV = Result.getLimitedValue(64);
      if ((TV > 63) || (mask & (1ULL << TV)) == 0)
        return Diag(TheCall->getBeginLoc(), diag::err_invalid_neon_type_code)
               << TheCall->getArg(ImmArg)->getSourceRange();
    }
  
    if (PtrArgNum >= 0) {
      // Check that pointer arguments have the specified type.
      Expr *Arg = TheCall->getArg(PtrArgNum);
      if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Arg))
        Arg = ICE->getSubExpr();
      ExprResult RHS = DefaultFunctionArrayLvalueConversion(Arg);
      QualType RHSTy = RHS.get()->getType();
  
      llvm::Triple::ArchType Arch = Context.getTargetInfo().getTriple().getArch();
      bool IsPolyUnsigned = Arch == llvm::Triple::aarch64 ||
                            Arch == llvm::Triple::aarch64_32 ||
                            Arch == llvm::Triple::aarch64_be;
      bool IsInt64Long =
          Context.getTargetInfo().getInt64Type() == TargetInfo::SignedLong;
      QualType EltTy =
          getNeonEltType(NeonTypeFlags(TV), Context, IsPolyUnsigned, IsInt64Long);
      if (HasConstPtr)
        EltTy = EltTy.withConst();
      QualType LHSTy = Context.getPointerType(EltTy);
      AssignConvertType ConvTy;
      ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS);
      if (RHS.isInvalid())
        return true;
      if (DiagnoseAssignmentResult(ConvTy, Arg->getBeginLoc(), LHSTy, RHSTy,
                                   RHS.get(), AA_Assigning))
        return true;
    }
  
    // For NEON intrinsics which take an immediate value as part of the
    // instruction, range check them here.
    unsigned i = 0, l = 0, u = 0;
    switch (BuiltinID) {
    default:
      return false;
    #define GET_NEON_IMMEDIATE_CHECK
    #include "clang/Basic/arm_neon.inc"
    #include "clang/Basic/arm_fp16.inc"
    #undef GET_NEON_IMMEDIATE_CHECK
    }
  
    return SemaBuiltinConstantArgRange(TheCall, i, l, u + l);
  }
  
  bool Sema::CheckMVEBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
    switch (BuiltinID) {
    default:
      return false;
    #include "clang/Basic/arm_mve_builtin_sema.inc"
    }
  }
  
  bool Sema::CheckARMBuiltinExclusiveCall(unsigned BuiltinID, CallExpr *TheCall,
                                          unsigned MaxWidth) {
    assert((BuiltinID == ARM::BI__builtin_arm_ldrex ||
            BuiltinID == ARM::BI__builtin_arm_ldaex ||
            BuiltinID == ARM::BI__builtin_arm_strex ||
            BuiltinID == ARM::BI__builtin_arm_stlex ||
            BuiltinID == AArch64::BI__builtin_arm_ldrex ||
            BuiltinID == AArch64::BI__builtin_arm_ldaex ||
            BuiltinID == AArch64::BI__builtin_arm_strex ||
            BuiltinID == AArch64::BI__builtin_arm_stlex) &&
           "unexpected ARM builtin");
    bool IsLdrex = BuiltinID == ARM::BI__builtin_arm_ldrex ||
                   BuiltinID == ARM::BI__builtin_arm_ldaex ||
                   BuiltinID == AArch64::BI__builtin_arm_ldrex ||
                   BuiltinID == AArch64::BI__builtin_arm_ldaex;
  
    DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
  
    // Ensure that we have the proper number of arguments.
    if (checkArgCount(*this, TheCall, IsLdrex ? 1 : 2))
      return true;
  
    // Inspect the pointer argument of the atomic builtin.  This should always be
    // a pointer type, whose element is an integral scalar or pointer type.
    // Because it is a pointer type, we don't have to worry about any implicit
    // casts here.
    Expr *PointerArg = TheCall->getArg(IsLdrex ? 0 : 1);
    ExprResult PointerArgRes = DefaultFunctionArrayLvalueConversion(PointerArg);
    if (PointerArgRes.isInvalid())
      return true;
    PointerArg = PointerArgRes.get();
  
    const PointerType *pointerType = PointerArg->getType()->getAs<PointerType>();
    if (!pointerType) {
      Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer)
          << PointerArg->getType() << PointerArg->getSourceRange();
      return true;
    }
  
    // ldrex takes a "const volatile T*" and strex takes a "volatile T*". Our next
    // task is to insert the appropriate casts into the AST. First work out just
    // what the appropriate type is.
    QualType ValType = pointerType->getPointeeType();
    QualType AddrType = ValType.getUnqualifiedType().withVolatile();
    if (IsLdrex)
      AddrType.addConst();
  
    // Issue a warning if the cast is dodgy.
    CastKind CastNeeded = CK_NoOp;
    if (!AddrType.isAtLeastAsQualifiedAs(ValType)) {
      CastNeeded = CK_BitCast;
      Diag(DRE->getBeginLoc(), diag::ext_typecheck_convert_discards_qualifiers)
          << PointerArg->getType() << Context.getPointerType(AddrType)
          << AA_Passing << PointerArg->getSourceRange();
    }
  
    // Finally, do the cast and replace the argument with the corrected version.
    AddrType = Context.getPointerType(AddrType);
    PointerArgRes = ImpCastExprToType(PointerArg, AddrType, CastNeeded);
    if (PointerArgRes.isInvalid())
      return true;
    PointerArg = PointerArgRes.get();
  
    TheCall->setArg(IsLdrex ? 0 : 1, PointerArg);
  
    // In general, we allow ints, floats and pointers to be loaded and stored.
    if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
        !ValType->isBlockPointerType() && !ValType->isFloatingType()) {
      Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer_intfltptr)
          << PointerArg->getType() << PointerArg->getSourceRange();
      return true;
    }
  
    // But ARM doesn't have instructions to deal with 128-bit versions.
    if (Context.getTypeSize(ValType) > MaxWidth) {
      assert(MaxWidth == 64 && "Diagnostic unexpectedly inaccurate");
      Diag(DRE->getBeginLoc(), diag::err_atomic_exclusive_builtin_pointer_size)
          << PointerArg->getType() << PointerArg->getSourceRange();
      return true;
    }
  
    switch (ValType.getObjCLifetime()) {
    case Qualifiers::OCL_None:
    case Qualifiers::OCL_ExplicitNone:
      // okay
      break;
  
    case Qualifiers::OCL_Weak:
    case Qualifiers::OCL_Strong:
    case Qualifiers::OCL_Autoreleasing:
      Diag(DRE->getBeginLoc(), diag::err_arc_atomic_ownership)
          << ValType << PointerArg->getSourceRange();
      return true;
    }
  
    if (IsLdrex) {
      TheCall->setType(ValType);
      return false;
    }
  
    // Initialize the argument to be stored.
    ExprResult ValArg = TheCall->getArg(0);
    InitializedEntity Entity = InitializedEntity::InitializeParameter(
        Context, ValType, /*consume*/ false);
    ValArg = PerformCopyInitialization(Entity, SourceLocation(), ValArg);
    if (ValArg.isInvalid())
      return true;
    TheCall->setArg(0, ValArg.get());
  
    // __builtin_arm_strex always returns an int. It's marked as such in the .def,
    // but the custom checker bypasses all default analysis.
    TheCall->setType(Context.IntTy);
    return false;
  }
  
  bool Sema::CheckARMBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
    if (BuiltinID == ARM::BI__builtin_arm_ldrex ||
        BuiltinID == ARM::BI__builtin_arm_ldaex ||
        BuiltinID == ARM::BI__builtin_arm_strex ||
        BuiltinID == ARM::BI__builtin_arm_stlex) {
      return CheckARMBuiltinExclusiveCall(BuiltinID, TheCall, 64);
    }
  
    if (BuiltinID == ARM::BI__builtin_arm_prefetch) {
      return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1) ||
        SemaBuiltinConstantArgRange(TheCall, 2, 0, 1);
    }
  
    if (BuiltinID == ARM::BI__builtin_arm_rsr64 ||
        BuiltinID == ARM::BI__builtin_arm_wsr64)
      return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 3, false);
  
    if (BuiltinID == ARM::BI__builtin_arm_rsr ||
        BuiltinID == ARM::BI__builtin_arm_rsrp ||
        BuiltinID == ARM::BI__builtin_arm_wsr ||
        BuiltinID == ARM::BI__builtin_arm_wsrp)
      return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 5, true);
  
    if (CheckNeonBuiltinFunctionCall(BuiltinID, TheCall))
      return true;
    if (CheckMVEBuiltinFunctionCall(BuiltinID, TheCall))
      return true;
  
    // For intrinsics which take an immediate value as part of the instruction,
    // range check them here.
    // FIXME: VFP Intrinsics should error if VFP not present.
    switch (BuiltinID) {
    default: return false;
    case ARM::BI__builtin_arm_ssat:
      return SemaBuiltinConstantArgRange(TheCall, 1, 1, 32);
    case ARM::BI__builtin_arm_usat:
      return SemaBuiltinConstantArgRange(TheCall, 1, 0, 31);
    case ARM::BI__builtin_arm_ssat16:
      return SemaBuiltinConstantArgRange(TheCall, 1, 1, 16);
    case ARM::BI__builtin_arm_usat16:
      return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15);
    case ARM::BI__builtin_arm_vcvtr_f:
    case ARM::BI__builtin_arm_vcvtr_d:
      return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1);
    case ARM::BI__builtin_arm_dmb:
    case ARM::BI__builtin_arm_dsb:
    case ARM::BI__builtin_arm_isb:
    case ARM::BI__builtin_arm_dbg:
      return SemaBuiltinConstantArgRange(TheCall, 0, 0, 15);
    }
  }
  
  bool Sema::CheckAArch64BuiltinFunctionCall(unsigned BuiltinID,
                                           CallExpr *TheCall) {
    if (BuiltinID == AArch64::BI__builtin_arm_ldrex ||
        BuiltinID == AArch64::BI__builtin_arm_ldaex ||
        BuiltinID == AArch64::BI__builtin_arm_strex ||
        BuiltinID == AArch64::BI__builtin_arm_stlex) {
      return CheckARMBuiltinExclusiveCall(BuiltinID, TheCall, 128);
    }
  
    if (BuiltinID == AArch64::BI__builtin_arm_prefetch) {
      return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1) ||
        SemaBuiltinConstantArgRange(TheCall, 2, 0, 2) ||
        SemaBuiltinConstantArgRange(TheCall, 3, 0, 1) ||
        SemaBuiltinConstantArgRange(TheCall, 4, 0, 1);
    }
  
    if (BuiltinID == AArch64::BI__builtin_arm_rsr64 ||
        BuiltinID == AArch64::BI__builtin_arm_wsr64)
      return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 5, true);
  
    // Memory Tagging Extensions (MTE) Intrinsics
    if (BuiltinID == AArch64::BI__builtin_arm_irg ||
        BuiltinID == AArch64::BI__builtin_arm_addg ||
        BuiltinID == AArch64::BI__builtin_arm_gmi ||
        BuiltinID == AArch64::BI__builtin_arm_ldg ||
        BuiltinID == AArch64::BI__builtin_arm_stg ||
        BuiltinID == AArch64::BI__builtin_arm_subp) {
      return SemaBuiltinARMMemoryTaggingCall(BuiltinID, TheCall);
    }
  
    if (BuiltinID == AArch64::BI__builtin_arm_rsr ||
        BuiltinID == AArch64::BI__builtin_arm_rsrp ||
        BuiltinID == AArch64::BI__builtin_arm_wsr ||
        BuiltinID == AArch64::BI__builtin_arm_wsrp)
      return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 5, true);
  
    // Only check the valid encoding range. Any constant in this range would be
    // converted to a register of the form S1_2_C3_C4_5. Let the hardware throw
    // an exception for incorrect registers. This matches MSVC behavior.
    if (BuiltinID == AArch64::BI_ReadStatusReg ||
        BuiltinID == AArch64::BI_WriteStatusReg)
      return SemaBuiltinConstantArgRange(TheCall, 0, 0, 0x7fff);
  
    if (BuiltinID == AArch64::BI__getReg)
      return SemaBuiltinConstantArgRange(TheCall, 0, 0, 31);
  
    if (CheckNeonBuiltinFunctionCall(BuiltinID, TheCall))
      return true;
  
    // For intrinsics which take an immediate value as part of the instruction,
    // range check them here.
    unsigned i = 0, l = 0, u = 0;
    switch (BuiltinID) {
    default: return false;
    case AArch64::BI__builtin_arm_dmb:
    case AArch64::BI__builtin_arm_dsb:
    case AArch64::BI__builtin_arm_isb: l = 0; u = 15; break;
    case AArch64::BI__builtin_arm_tcancel: l = 0; u = 65535; break;
    }
  
    return SemaBuiltinConstantArgRange(TheCall, i, l, u + l);
  }
  
  bool Sema::CheckBPFBuiltinFunctionCall(unsigned BuiltinID,
                                         CallExpr *TheCall) {
    assert(BuiltinID == BPF::BI__builtin_preserve_field_info &&
           "unexpected ARM builtin");
  
    if (checkArgCount(*this, TheCall, 2))
      return true;
  
    // The first argument needs to be a record field access.
    // If it is an array element access, we delay decision
    // to BPF backend to check whether the access is a
    // field access or not.
    Expr *Arg = TheCall->getArg(0);
    if (Arg->getType()->getAsPlaceholderType() ||
        (Arg->IgnoreParens()->getObjectKind() != OK_BitField &&
         !dyn_cast<MemberExpr>(Arg->IgnoreParens()) &&
         !dyn_cast<ArraySubscriptExpr>(Arg->IgnoreParens()))) {
      Diag(Arg->getBeginLoc(), diag::err_preserve_field_info_not_field)
          << 1 << Arg->getSourceRange();
      return true;
    }
  
    // The second argument needs to be a constant int
    llvm::APSInt Value;
    if (!TheCall->getArg(1)->isIntegerConstantExpr(Value, Context)) {
      Diag(Arg->getBeginLoc(), diag::err_preserve_field_info_not_const)
          << 2 << Arg->getSourceRange();
      return true;
    }
  
    TheCall->setType(Context.UnsignedIntTy);
    return false;
  }
  
  bool Sema::CheckHexagonBuiltinCpu(unsigned BuiltinID, CallExpr *TheCall) {
    struct BuiltinAndString {
      unsigned BuiltinID;
      const char *Str;
    };
  
    static BuiltinAndString ValidCPU[] = {
      { Hexagon::BI__builtin_HEXAGON_A6_vcmpbeq_notany, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_A6_vminub_RdP, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_F2_dfadd, "v66" },
      { Hexagon::BI__builtin_HEXAGON_F2_dfsub, "v66" },
      { Hexagon::BI__builtin_HEXAGON_M2_mnaci, "v66" },
      { Hexagon::BI__builtin_HEXAGON_M6_vabsdiffb, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_M6_vabsdiffub, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_S2_mask, "v66" },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_and, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_nac, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_or, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_xacc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_and, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_nac, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_or, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_xacc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_S6_vsplatrbp, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_S6_vtrunehb_ppp, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_S6_vtrunohb_ppp, "v62,v65,v66" },
    };
  
    static BuiltinAndString ValidHVX[] = {
      { Hexagon::BI__builtin_HEXAGON_V6_hi, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_hi_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_lo, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_lo_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_extractw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_extractw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_lvsplatb, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_lvsplatb_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_lvsplath, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_lvsplath_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_lvsplatw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_lvsplatw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_pred_and, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_pred_and_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_pred_and_n, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_pred_and_n_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_pred_not, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_pred_not_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_pred_or, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_pred_or_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_pred_or_n, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_pred_or_n_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_pred_scalar2, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_pred_scalar2_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_pred_scalar2v2, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_pred_scalar2v2_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_pred_xor, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_pred_xor_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_shuffeqh, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_shuffeqh_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_shuffeqw, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_shuffeqw_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsb, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsb_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsb_sat, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsb_sat_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsdiffh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsdiffh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsdiffub, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsdiffub_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsdiffuh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsdiffuh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsdiffw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsdiffw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsh_sat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsh_sat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsw_sat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vabsw_sat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddb_dv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddb_dv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddbsat, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddbsat_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddbsat_dv, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddbsat_dv_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddcarry, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddcarry_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddcarrysat, "v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddcarrysat_128B, "v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddclbh, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddclbh_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddclbw, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddclbw_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddh_dv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddh_dv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddhsat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddhsat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddhsat_dv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddhsat_dv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddhw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddhw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddhw_acc, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddhw_acc_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddubh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddubh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddubh_acc, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddubh_acc_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddubsat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddubsat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddubsat_dv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddubsat_dv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddububb_sat, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddububb_sat_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vadduhsat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vadduhsat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vadduhsat_dv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vadduhsat_dv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vadduhw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vadduhw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vadduhw_acc, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vadduhw_acc_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vadduwsat, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vadduwsat_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vadduwsat_dv, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vadduwsat_dv_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddw_dv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddw_dv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddwsat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddwsat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddwsat_dv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaddwsat_dv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_valignb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_valignb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_valignbi, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_valignbi_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vand, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vand_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vandnqrt, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vandnqrt_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vandnqrt_acc, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vandnqrt_acc_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vandqrt, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vandqrt_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vandqrt_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vandqrt_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vandvnqv, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vandvnqv_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vandvqv, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vandvqv_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vandvrt, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vandvrt_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vandvrt_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vandvrt_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaslh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaslh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaslh_acc, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaslh_acc_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaslhv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaslhv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaslw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaslw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaslw_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaslw_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaslwv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vaslwv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrh_acc, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrh_acc_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrhbrndsat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrhbrndsat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrhbsat, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrhbsat_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrhubrndsat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrhubrndsat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrhubsat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrhubsat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrhv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrhv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasr_into, "v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasr_into_128B, "v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasruhubrndsat, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasruhubrndsat_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasruhubsat, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasruhubsat_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasruwuhrndsat, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasruwuhrndsat_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasruwuhsat, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasruwuhsat_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrw_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrw_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrwh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrwh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrwhrndsat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrwhrndsat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrwhsat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrwhsat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrwuhrndsat, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrwuhrndsat_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrwuhsat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrwuhsat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrwv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vasrwv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vassign, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vassign_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vassignp, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vassignp_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavgb, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavgb_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavgbrnd, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavgbrnd_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavgh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavgh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavghrnd, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavghrnd_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavgub, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavgub_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavgubrnd, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavgubrnd_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavguh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavguh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavguhrnd, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavguhrnd_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavguw, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavguw_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavguwrnd, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavguwrnd_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavgw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavgw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavgwrnd, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vavgwrnd_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vcl0h, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vcl0h_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vcl0w, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vcl0w_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vcombine, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vcombine_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vd0, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vd0_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdd0, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdd0_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdealb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdealb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdealb4w, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdealb4w_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdealh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdealh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdealvdd, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdealvdd_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdelta, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdelta_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpybus, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpybus_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpybus_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpybus_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpybus_dv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpybus_dv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpybus_dv_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpybus_dv_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhb_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhb_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhb_dv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhb_dv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhb_dv_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhb_dv_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhisat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhisat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhisat_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhisat_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsat_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsat_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsuisat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsuisat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsuisat_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsuisat_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsusat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsusat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsusat_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsusat_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhvsat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhvsat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhvsat_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhvsat_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdsaduh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdsaduh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdsaduh_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vdsaduh_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqb_and, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqb_and_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqb_or, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqb_or_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqb_xor, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqb_xor_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqh_and, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqh_and_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqh_or, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqh_or_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqh_xor, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqh_xor_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqw_and, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqw_and_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqw_or, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqw_or_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqw_xor, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_veqw_xor_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtb_and, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtb_and_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtb_or, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtb_or_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtb_xor, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtb_xor_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgth, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgth_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgth_and, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgth_and_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgth_or, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgth_or_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgth_xor, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgth_xor_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtub, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtub_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtub_and, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtub_and_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtub_or, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtub_or_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtub_xor, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtub_xor_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtuh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtuh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtuh_and, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtuh_and_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtuh_or, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtuh_or_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtuh_xor, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtuh_xor_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtuw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtuw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtuw_and, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtuw_and_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtuw_or, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtuw_or_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtuw_xor, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtuw_xor_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtw_and, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtw_and_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtw_or, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtw_or_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtw_xor, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vgtw_xor_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vinsertwr, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vinsertwr_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlalignb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlalignb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlalignbi, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlalignbi_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlsrb, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlsrb_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlsrh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlsrh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlsrhv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlsrhv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlsrw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlsrw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlsrwv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlsrwv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlut4, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlut4_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvvb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvvb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvvbi, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvvbi_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvvb_nm, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvvb_nm_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvvb_oracc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvvb_oracc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvvb_oracci, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvvb_oracci_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvwh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvwh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvwhi, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvwhi_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvwh_nm, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvwh_nm_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvwh_oracc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvwh_oracc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvwh_oracci, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vlutvwh_oracci_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmaxb, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmaxb_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmaxh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmaxh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmaxub, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmaxub_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmaxuh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmaxuh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmaxw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmaxw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vminb, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vminb_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vminh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vminh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vminub, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vminub_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vminuh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vminuh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vminw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vminw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpabus, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpabus_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpabus_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpabus_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpabusv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpabusv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpabuu, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpabuu_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpabuu_acc, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpabuu_acc_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpabuuv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpabuuv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpahb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpahb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpahb_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpahb_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpahhsat, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpahhsat_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpauhb, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpauhb_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpauhb_acc, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpauhb_acc_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpauhuhsat, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpauhuhsat_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpsuhuhsat, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpsuhuhsat_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpybus, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpybus_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpybus_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpybus_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpybusv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpybusv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpybusv_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpybusv_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpybv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpybv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpybv_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpybv_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyewuh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyewuh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyewuh_64, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyewuh_64_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyh_acc, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyh_acc_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyhsat_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyhsat_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyhsrs, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyhsrs_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyhss, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyhss_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyhus, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyhus_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyhus_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyhus_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyhv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyhv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyhv_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyhv_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyhvsrs, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyhvsrs_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyieoh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyieoh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiewh_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiewh_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiewuh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiewuh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiewuh_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiewuh_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyih, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyih_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyih_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyih_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyihb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyihb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyihb_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyihb_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiowh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiowh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwb_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwb_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwh_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwh_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwub, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwub_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwub_acc, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwub_acc_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_64_acc, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_64_acc_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_rnd, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_rnd_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_rnd_sacc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_rnd_sacc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_sacc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_sacc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyub, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyub_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyub_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyub_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyubv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyubv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyubv_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyubv_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyuh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyuh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyuh_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyuh_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyuhe, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyuhe_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyuhe_acc, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyuhe_acc_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyuhv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyuhv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyuhv_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmpyuhv_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmux, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vmux_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vnavgb, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vnavgb_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vnavgh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vnavgh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vnavgub, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vnavgub_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vnavgw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vnavgw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vnormamth, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vnormamth_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vnormamtw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vnormamtw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vnot, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vnot_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vor, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vor_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpackeb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpackeb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpackeh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpackeh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpackhb_sat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpackhb_sat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpackhub_sat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpackhub_sat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpackob, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpackob_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpackoh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpackoh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpackwh_sat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpackwh_sat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpackwuh_sat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpackwuh_sat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpopcounth, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vpopcounth_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vprefixqb, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vprefixqb_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vprefixqh, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vprefixqh_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vprefixqw, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vprefixqw_128B, "v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrdelta, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrdelta_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybub_rtt, "v65" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybub_rtt_128B, "v65" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybub_rtt_acc, "v65" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybub_rtt_acc_128B, "v65" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybus, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybus_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybus_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybus_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusv_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusv_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybv_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybv_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyub, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyub_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyub_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyub_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyub_rtt, "v65" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyub_rtt_128B, "v65" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyub_rtt_acc, "v65" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyub_rtt_acc_128B, "v65" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubv_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubv_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vror, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vror_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrotr, "v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrotr_128B, "v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vroundhb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vroundhb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vroundhub, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vroundhub_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrounduhub, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrounduhub_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrounduwuh, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrounduwuh_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vroundwh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vroundwh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vroundwuh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vroundwuh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsatdw, "v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsatdw_128B, "v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsathub, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsathub_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsatuwuh, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsatuwuh_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsatwh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsatwh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshufeh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshufeh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshuffb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshuffb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshuffeb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshuffeb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshuffh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshuffh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshuffob, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshuffob_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshuffvdd, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshuffvdd_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshufoeb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshufoeb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshufoeh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshufoeh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshufoh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vshufoh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubb_dv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubb_dv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubbsat, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubbsat_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubbsat_dv, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubbsat_dv_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubcarry, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubcarry_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubh_dv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubh_dv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubhsat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubhsat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubhsat_dv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubhsat_dv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubhw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubhw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsububh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsububh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsububsat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsububsat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsububsat_dv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsububsat_dv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubububb_sat, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubububb_sat_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubuhsat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubuhsat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubuhsat_dv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubuhsat_dv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubuhw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubuhw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubuwsat, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubuwsat_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubuwsat_dv, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubuwsat_dv_128B, "v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubw, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubw_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubw_dv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubw_dv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubwsat, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubwsat_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubwsat_dv, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vsubwsat_dv_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vswap, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vswap_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vtmpyb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vtmpyb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vtmpyb_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vtmpyb_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vtmpybus, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vtmpybus_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vtmpybus_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vtmpybus_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vtmpyhb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vtmpyhb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vtmpyhb_acc, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vtmpyhb_acc_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vunpackb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vunpackb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vunpackh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vunpackh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vunpackob, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vunpackob_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vunpackoh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vunpackoh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vunpackub, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vunpackub_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vunpackuh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vunpackuh_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vxor, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vxor_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vzb, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vzb_128B, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vzh, "v60,v62,v65,v66" },
      { Hexagon::BI__builtin_HEXAGON_V6_vzh_128B, "v60,v62,v65,v66" },
    };
  
    // Sort the tables on first execution so we can binary search them.
    auto SortCmp = [](const BuiltinAndString &LHS, const BuiltinAndString &RHS) {
      return LHS.BuiltinID < RHS.BuiltinID;
    };
    static const bool SortOnce =
        (llvm::sort(ValidCPU, SortCmp),
         llvm::sort(ValidHVX, SortCmp), true);
    (void)SortOnce;
    auto LowerBoundCmp = [](const BuiltinAndString &BI, unsigned BuiltinID) {
      return BI.BuiltinID < BuiltinID;
    };
  
    const TargetInfo &TI = Context.getTargetInfo();
  
    const BuiltinAndString *FC =
        llvm::lower_bound(ValidCPU, BuiltinID, LowerBoundCmp);
    if (FC != std::end(ValidCPU) && FC->BuiltinID == BuiltinID) {
      const TargetOptions &Opts = TI.getTargetOpts();
      StringRef CPU = Opts.CPU;
      if (!CPU.empty()) {
        assert(CPU.startswith("hexagon") && "Unexpected CPU name");
        CPU.consume_front("hexagon");
        SmallVector<StringRef, 3> CPUs;
        StringRef(FC->Str).split(CPUs, ',');
        if (llvm::none_of(CPUs, [CPU](StringRef S) { return S == CPU; }))
          return Diag(TheCall->getBeginLoc(),
                      diag::err_hexagon_builtin_unsupported_cpu);
      }
    }
  
    const BuiltinAndString *FH =
        llvm::lower_bound(ValidHVX, BuiltinID, LowerBoundCmp);
    if (FH != std::end(ValidHVX) && FH->BuiltinID == BuiltinID) {
      if (!TI.hasFeature("hvx"))
        return Diag(TheCall->getBeginLoc(),
                    diag::err_hexagon_builtin_requires_hvx);
  
      SmallVector<StringRef, 3> HVXs;
      StringRef(FH->Str).split(HVXs, ',');
      bool IsValid = llvm::any_of(HVXs,
                                  [&TI] (StringRef V) {
                                    std::string F = "hvx" + V.str();
                                    return TI.hasFeature(F);
                                  });
      if (!IsValid)
        return Diag(TheCall->getBeginLoc(),
                    diag::err_hexagon_builtin_unsupported_hvx);
    }
  
    return false;
  }
  
  bool Sema::CheckHexagonBuiltinArgument(unsigned BuiltinID, CallExpr *TheCall) {
    struct ArgInfo {
      uint8_t OpNum;
      bool IsSigned;
      uint8_t BitWidth;
      uint8_t Align;
    };
    struct BuiltinInfo {
      unsigned BuiltinID;
      ArgInfo Infos[2];
    };
  
    static BuiltinInfo Infos[] = {
      { Hexagon::BI__builtin_circ_ldd,                  {{ 3, true,  4,  3 }} },
      { Hexagon::BI__builtin_circ_ldw,                  {{ 3, true,  4,  2 }} },
      { Hexagon::BI__builtin_circ_ldh,                  {{ 3, true,  4,  1 }} },
      { Hexagon::BI__builtin_circ_lduh,                 {{ 3, true,  4,  0 }} },
      { Hexagon::BI__builtin_circ_ldb,                  {{ 3, true,  4,  0 }} },
      { Hexagon::BI__builtin_circ_ldub,                 {{ 3, true,  4,  0 }} },
      { Hexagon::BI__builtin_circ_std,                  {{ 3, true,  4,  3 }} },
      { Hexagon::BI__builtin_circ_stw,                  {{ 3, true,  4,  2 }} },
      { Hexagon::BI__builtin_circ_sth,                  {{ 3, true,  4,  1 }} },
      { Hexagon::BI__builtin_circ_sthhi,                {{ 3, true,  4,  1 }} },
      { Hexagon::BI__builtin_circ_stb,                  {{ 3, true,  4,  0 }} },
  
      { Hexagon::BI__builtin_HEXAGON_L2_loadrub_pci,    {{ 1, true,  4,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_L2_loadrb_pci,     {{ 1, true,  4,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_L2_loadruh_pci,    {{ 1, true,  4,  1 }} },
      { Hexagon::BI__builtin_HEXAGON_L2_loadrh_pci,     {{ 1, true,  4,  1 }} },
      { Hexagon::BI__builtin_HEXAGON_L2_loadri_pci,     {{ 1, true,  4,  2 }} },
      { Hexagon::BI__builtin_HEXAGON_L2_loadrd_pci,     {{ 1, true,  4,  3 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_storerb_pci,    {{ 1, true,  4,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_storerh_pci,    {{ 1, true,  4,  1 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_storerf_pci,    {{ 1, true,  4,  1 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_storeri_pci,    {{ 1, true,  4,  2 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_storerd_pci,    {{ 1, true,  4,  3 }} },
  
      { Hexagon::BI__builtin_HEXAGON_A2_combineii,      {{ 1, true,  8,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_A2_tfrih,          {{ 1, false, 16, 0 }} },
      { Hexagon::BI__builtin_HEXAGON_A2_tfril,          {{ 1, false, 16, 0 }} },
      { Hexagon::BI__builtin_HEXAGON_A2_tfrpi,          {{ 0, true,  8,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_A4_bitspliti,      {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_A4_cmpbeqi,        {{ 1, false, 8,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_A4_cmpbgti,        {{ 1, true,  8,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_A4_cround_ri,      {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_A4_round_ri,       {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_A4_round_ri_sat,   {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_A4_vcmpbeqi,       {{ 1, false, 8,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_A4_vcmpbgti,       {{ 1, true,  8,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_A4_vcmpbgtui,      {{ 1, false, 7,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_A4_vcmpheqi,       {{ 1, true,  8,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_A4_vcmphgti,       {{ 1, true,  8,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_A4_vcmphgtui,      {{ 1, false, 7,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_A4_vcmpweqi,       {{ 1, true,  8,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_A4_vcmpwgti,       {{ 1, true,  8,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_A4_vcmpwgtui,      {{ 1, false, 7,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_C2_bitsclri,       {{ 1, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_C2_muxii,          {{ 2, true,  8,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_C4_nbitsclri,      {{ 1, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_F2_dfclass,        {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_F2_dfimm_n,        {{ 0, false, 10, 0 }} },
      { Hexagon::BI__builtin_HEXAGON_F2_dfimm_p,        {{ 0, false, 10, 0 }} },
      { Hexagon::BI__builtin_HEXAGON_F2_sfclass,        {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_F2_sfimm_n,        {{ 0, false, 10, 0 }} },
      { Hexagon::BI__builtin_HEXAGON_F2_sfimm_p,        {{ 0, false, 10, 0 }} },
      { Hexagon::BI__builtin_HEXAGON_M4_mpyri_addi,     {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_M4_mpyri_addr_u2,  {{ 1, false, 6,  2 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_addasl_rrri,    {{ 2, false, 3,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_acc,    {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_and,    {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p,        {{ 1, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_nac,    {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_or,     {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_xacc,   {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_acc,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_and,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r,        {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_nac,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_or,     {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_sat,    {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_xacc,   {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asl_i_vh,       {{ 1, false, 4,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asl_i_vw,       {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_acc,    {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_and,    {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p,        {{ 1, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_nac,    {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_or,     {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_rnd_goodsyntax,
                                                        {{ 1, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_rnd,    {{ 1, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_acc,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_and,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r,        {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_nac,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_or,     {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_rnd_goodsyntax,
                                                        {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_rnd,    {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_svw_trun, {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_vh,       {{ 1, false, 4,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_asr_i_vw,       {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_clrbit_i,       {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_extractu,       {{ 1, false, 5,  0 },
                                                         { 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_extractup,      {{ 1, false, 6,  0 },
                                                         { 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_insert,         {{ 2, false, 5,  0 },
                                                         { 3, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_insertp,        {{ 2, false, 6,  0 },
                                                         { 3, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_acc,    {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_and,    {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p,        {{ 1, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_nac,    {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_or,     {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_xacc,   {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_acc,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_and,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r,        {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_nac,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_or,     {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_xacc,   {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_vh,       {{ 1, false, 4,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_vw,       {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_setbit_i,       {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_tableidxb_goodsyntax,
                                                        {{ 2, false, 4,  0 },
                                                         { 3, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_tableidxd_goodsyntax,
                                                        {{ 2, false, 4,  0 },
                                                         { 3, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_tableidxh_goodsyntax,
                                                        {{ 2, false, 4,  0 },
                                                         { 3, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_tableidxw_goodsyntax,
                                                        {{ 2, false, 4,  0 },
                                                         { 3, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_togglebit_i,    {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_tstbit_i,       {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_valignib,       {{ 2, false, 3,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S2_vspliceib,      {{ 2, false, 3,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S4_addi_asl_ri,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S4_addi_lsr_ri,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S4_andi_asl_ri,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S4_andi_lsr_ri,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S4_clbaddi,        {{ 1, true , 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S4_clbpaddi,       {{ 1, true,  6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S4_extract,        {{ 1, false, 5,  0 },
                                                         { 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S4_extractp,       {{ 1, false, 6,  0 },
                                                         { 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S4_lsli,           {{ 0, true,  6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S4_ntstbit_i,      {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S4_ori_asl_ri,     {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S4_ori_lsr_ri,     {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S4_subi_asl_ri,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S4_subi_lsr_ri,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S4_vrcrotate_acc,  {{ 3, false, 2,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S4_vrcrotate,      {{ 2, false, 2,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S5_asrhub_rnd_sat_goodsyntax,
                                                        {{ 1, false, 4,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S5_asrhub_sat,     {{ 1, false, 4,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S5_vasrhrnd_goodsyntax,
                                                        {{ 1, false, 4,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p,        {{ 1, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_acc,    {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_and,    {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_nac,    {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_or,     {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_xacc,   {{ 2, false, 6,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r,        {{ 1, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_acc,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_and,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_nac,    {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_or,     {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_xacc,   {{ 2, false, 5,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_V6_valignbi,       {{ 2, false, 3,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_V6_valignbi_128B,  {{ 2, false, 3,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_V6_vlalignbi,      {{ 2, false, 3,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_V6_vlalignbi_128B, {{ 2, false, 3,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi,      {{ 2, false, 1,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_128B, {{ 2, false, 1,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_acc,  {{ 3, false, 1,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_acc_128B,
                                                        {{ 3, false, 1,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi,       {{ 2, false, 1,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_128B,  {{ 2, false, 1,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_acc,   {{ 3, false, 1,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_acc_128B,
                                                        {{ 3, false, 1,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi,       {{ 2, false, 1,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_128B,  {{ 2, false, 1,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_acc,   {{ 3, false, 1,  0 }} },
      { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_acc_128B,
                                                        {{ 3, false, 1,  0 }} },
    };
  
    // Use a dynamically initialized static to sort the table exactly once on
    // first run.
    static const bool SortOnce =
        (llvm::sort(Infos,
                   [](const BuiltinInfo &LHS, const BuiltinInfo &RHS) {
                     return LHS.BuiltinID < RHS.BuiltinID;
                   }),
         true);
    (void)SortOnce;
  
    const BuiltinInfo *F = llvm::partition_point(
        Infos, [=](const BuiltinInfo &BI) { return BI.BuiltinID < BuiltinID; });
    if (F == std::end(Infos) || F->BuiltinID != BuiltinID)
      return false;
  
    bool Error = false;
  
    for (const ArgInfo &A : F->Infos) {
      // Ignore empty ArgInfo elements.
      if (A.BitWidth == 0)
        continue;
  
      int32_t Min = A.IsSigned ? -(1 << (A.BitWidth - 1)) : 0;
      int32_t Max = (1 << (A.IsSigned ? A.BitWidth - 1 : A.BitWidth)) - 1;
      if (!A.Align) {
        Error |= SemaBuiltinConstantArgRange(TheCall, A.OpNum, Min, Max);
      } else {
        unsigned M = 1 << A.Align;
        Min *= M;
        Max *= M;
        Error |= SemaBuiltinConstantArgRange(TheCall, A.OpNum, Min, Max) |
                 SemaBuiltinConstantArgMultiple(TheCall, A.OpNum, M);
      }
    }
    return Error;
  }
  
  bool Sema::CheckHexagonBuiltinFunctionCall(unsigned BuiltinID,
                                             CallExpr *TheCall) {
    return CheckHexagonBuiltinCpu(BuiltinID, TheCall) ||
           CheckHexagonBuiltinArgument(BuiltinID, TheCall);
  }
  
  bool Sema::CheckMipsBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
    return CheckMipsBuiltinCpu(BuiltinID, TheCall) ||
           CheckMipsBuiltinArgument(BuiltinID, TheCall);
  }
  
  bool Sema::CheckMipsBuiltinCpu(unsigned BuiltinID, CallExpr *TheCall) {
    const TargetInfo &TI = Context.getTargetInfo();
  
    if (Mips::BI__builtin_mips_addu_qb <= BuiltinID &&
        BuiltinID <= Mips::BI__builtin_mips_lwx) {
      if (!TI.hasFeature("dsp"))
        return Diag(TheCall->getBeginLoc(), diag::err_mips_builtin_requires_dsp);
    }
  
    if (Mips::BI__builtin_mips_absq_s_qb <= BuiltinID &&
        BuiltinID <= Mips::BI__builtin_mips_subuh_r_qb) {
      if (!TI.hasFeature("dspr2"))
        return Diag(TheCall->getBeginLoc(),
                    diag::err_mips_builtin_requires_dspr2);
    }
  
    if (Mips::BI__builtin_msa_add_a_b <= BuiltinID &&
        BuiltinID <= Mips::BI__builtin_msa_xori_b) {
      if (!TI.hasFeature("msa"))
        return Diag(TheCall->getBeginLoc(), diag::err_mips_builtin_requires_msa);
    }
  
    return false;
  }
  
  // CheckMipsBuiltinArgument - Checks the constant value passed to the
  // intrinsic is correct. The switch statement is ordered by DSP, MSA. The
  // ordering for DSP is unspecified. MSA is ordered by the data format used
  // by the underlying instruction i.e., df/m, df/n and then by size.
  //
  // FIXME: The size tests here should instead be tablegen'd along with the
  //        definitions from include/clang/Basic/BuiltinsMips.def.
  // FIXME: GCC is strict on signedness for some of these intrinsics, we should
  //        be too.
  bool Sema::CheckMipsBuiltinArgument(unsigned BuiltinID, CallExpr *TheCall) {
    unsigned i = 0, l = 0, u = 0, m = 0;
    switch (BuiltinID) {
    default: return false;
    case Mips::BI__builtin_mips_wrdsp: i = 1; l = 0; u = 63; break;
    case Mips::BI__builtin_mips_rddsp: i = 0; l = 0; u = 63; break;
    case Mips::BI__builtin_mips_append: i = 2; l = 0; u = 31; break;
    case Mips::BI__builtin_mips_balign: i = 2; l = 0; u = 3; break;
    case Mips::BI__builtin_mips_precr_sra_ph_w: i = 2; l = 0; u = 31; break;
    case Mips::BI__builtin_mips_precr_sra_r_ph_w: i = 2; l = 0; u = 31; break;
    case Mips::BI__builtin_mips_prepend: i = 2; l = 0; u = 31; break;
    // MSA intrinsics. Instructions (which the intrinsics maps to) which use the
    // df/m field.
    // These intrinsics take an unsigned 3 bit immediate.
    case Mips::BI__builtin_msa_bclri_b:
    case Mips::BI__builtin_msa_bnegi_b:
    case Mips::BI__builtin_msa_bseti_b:
    case Mips::BI__builtin_msa_sat_s_b:
    case Mips::BI__builtin_msa_sat_u_b:
    case Mips::BI__builtin_msa_slli_b:
    case Mips::BI__builtin_msa_srai_b:
    case Mips::BI__builtin_msa_srari_b:
    case Mips::BI__builtin_msa_srli_b:
    case Mips::BI__builtin_msa_srlri_b: i = 1; l = 0; u = 7; break;
    case Mips::BI__builtin_msa_binsli_b:
    case Mips::BI__builtin_msa_binsri_b: i = 2; l = 0; u = 7; break;
    // These intrinsics take an unsigned 4 bit immediate.
    case Mips::BI__builtin_msa_bclri_h:
    case Mips::BI__builtin_msa_bnegi_h:
    case Mips::BI__builtin_msa_bseti_h:
    case Mips::BI__builtin_msa_sat_s_h:
    case Mips::BI__builtin_msa_sat_u_h:
    case Mips::BI__builtin_msa_slli_h:
    case Mips::BI__builtin_msa_srai_h:
    case Mips::BI__builtin_msa_srari_h:
    case Mips::BI__builtin_msa_srli_h:
    case Mips::BI__builtin_msa_srlri_h: i = 1; l = 0; u = 15; break;
    case Mips::BI__builtin_msa_binsli_h:
    case Mips::BI__builtin_msa_binsri_h: i = 2; l = 0; u = 15; break;
    // These intrinsics take an unsigned 5 bit immediate.
    // The first block of intrinsics actually have an unsigned 5 bit field,
    // not a df/n field.
    case Mips::BI__builtin_msa_cfcmsa:
    case Mips::BI__builtin_msa_ctcmsa: i = 0; l = 0; u = 31; break;
    case Mips::BI__builtin_msa_clei_u_b:
    case Mips::BI__builtin_msa_clei_u_h:
    case Mips::BI__builtin_msa_clei_u_w:
    case Mips::BI__builtin_msa_clei_u_d:
    case Mips::BI__builtin_msa_clti_u_b:
    case Mips::BI__builtin_msa_clti_u_h:
    case Mips::BI__builtin_msa_clti_u_w:
    case Mips::BI__builtin_msa_clti_u_d:
    case Mips::BI__builtin_msa_maxi_u_b:
    case Mips::BI__builtin_msa_maxi_u_h:
    case Mips::BI__builtin_msa_maxi_u_w:
    case Mips::BI__builtin_msa_maxi_u_d:
    case Mips::BI__builtin_msa_mini_u_b:
    case Mips::BI__builtin_msa_mini_u_h:
    case Mips::BI__builtin_msa_mini_u_w:
    case Mips::BI__builtin_msa_mini_u_d:
    case Mips::BI__builtin_msa_addvi_b:
    case Mips::BI__builtin_msa_addvi_h:
    case Mips::BI__builtin_msa_addvi_w:
    case Mips::BI__builtin_msa_addvi_d:
    case Mips::BI__builtin_msa_bclri_w:
    case Mips::BI__builtin_msa_bnegi_w:
    case Mips::BI__builtin_msa_bseti_w:
    case Mips::BI__builtin_msa_sat_s_w:
    case Mips::BI__builtin_msa_sat_u_w:
    case Mips::BI__builtin_msa_slli_w:
    case Mips::BI__builtin_msa_srai_w:
    case Mips::BI__builtin_msa_srari_w:
    case Mips::BI__builtin_msa_srli_w:
    case Mips::BI__builtin_msa_srlri_w:
    case Mips::BI__builtin_msa_subvi_b:
    case Mips::BI__builtin_msa_subvi_h:
    case Mips::BI__builtin_msa_subvi_w:
    case Mips::BI__builtin_msa_subvi_d: i = 1; l = 0; u = 31; break;
    case Mips::BI__builtin_msa_binsli_w:
    case Mips::BI__builtin_msa_binsri_w: i = 2; l = 0; u = 31; break;
    // These intrinsics take an unsigned 6 bit immediate.
    case Mips::BI__builtin_msa_bclri_d:
    case Mips::BI__builtin_msa_bnegi_d:
    case Mips::BI__builtin_msa_bseti_d:
    case Mips::BI__builtin_msa_sat_s_d:
    case Mips::BI__builtin_msa_sat_u_d:
    case Mips::BI__builtin_msa_slli_d:
    case Mips::BI__builtin_msa_srai_d:
    case Mips::BI__builtin_msa_srari_d:
    case Mips::BI__builtin_msa_srli_d:
    case Mips::BI__builtin_msa_srlri_d: i = 1; l = 0; u = 63; break;
    case Mips::BI__builtin_msa_binsli_d:
    case Mips::BI__builtin_msa_binsri_d: i = 2; l = 0; u = 63; break;
    // These intrinsics take a signed 5 bit immediate.
    case Mips::BI__builtin_msa_ceqi_b:
    case Mips::BI__builtin_msa_ceqi_h:
    case Mips::BI__builtin_msa_ceqi_w:
    case Mips::BI__builtin_msa_ceqi_d:
    case Mips::BI__builtin_msa_clti_s_b:
    case Mips::BI__builtin_msa_clti_s_h:
    case Mips::BI__builtin_msa_clti_s_w:
    case Mips::BI__builtin_msa_clti_s_d:
    case Mips::BI__builtin_msa_clei_s_b:
    case Mips::BI__builtin_msa_clei_s_h:
    case Mips::BI__builtin_msa_clei_s_w:
    case Mips::BI__builtin_msa_clei_s_d:
    case Mips::BI__builtin_msa_maxi_s_b:
    case Mips::BI__builtin_msa_maxi_s_h:
    case Mips::BI__builtin_msa_maxi_s_w:
    case Mips::BI__builtin_msa_maxi_s_d:
    case Mips::BI__builtin_msa_mini_s_b:
    case Mips::BI__builtin_msa_mini_s_h:
    case Mips::BI__builtin_msa_mini_s_w:
    case Mips::BI__builtin_msa_mini_s_d: i = 1; l = -16; u = 15; break;
    // These intrinsics take an unsigned 8 bit immediate.
    case Mips::BI__builtin_msa_andi_b:
    case Mips::BI__builtin_msa_nori_b:
    case Mips::BI__builtin_msa_ori_b:
    case Mips::BI__builtin_msa_shf_b:
    case Mips::BI__builtin_msa_shf_h:
    case Mips::BI__builtin_msa_shf_w:
    case Mips::BI__builtin_msa_xori_b: i = 1; l = 0; u = 255; break;
    case Mips::BI__builtin_msa_bseli_b:
    case Mips::BI__builtin_msa_bmnzi_b:
    case Mips::BI__builtin_msa_bmzi_b: i = 2; l = 0; u = 255; break;
    // df/n format
    // These intrinsics take an unsigned 4 bit immediate.
    case Mips::BI__builtin_msa_copy_s_b:
    case Mips::BI__builtin_msa_copy_u_b:
    case Mips::BI__builtin_msa_insve_b:
    case Mips::BI__builtin_msa_splati_b: i = 1; l = 0; u = 15; break;
    case Mips::BI__builtin_msa_sldi_b: i = 2; l = 0; u = 15; break;
    // These intrinsics take an unsigned 3 bit immediate.
    case Mips::BI__builtin_msa_copy_s_h:
    case Mips::BI__builtin_msa_copy_u_h:
    case Mips::BI__builtin_msa_insve_h:
    case Mips::BI__builtin_msa_splati_h: i = 1; l = 0; u = 7; break;
    case Mips::BI__builtin_msa_sldi_h: i = 2; l = 0; u = 7; break;
    // These intrinsics take an unsigned 2 bit immediate.
    case Mips::BI__builtin_msa_copy_s_w:
    case Mips::BI__builtin_msa_copy_u_w:
    case Mips::BI__builtin_msa_insve_w:
    case Mips::BI__builtin_msa_splati_w: i = 1; l = 0; u = 3; break;
    case Mips::BI__builtin_msa_sldi_w: i = 2; l = 0; u = 3; break;
    // These intrinsics take an unsigned 1 bit immediate.
    case Mips::BI__builtin_msa_copy_s_d:
    case Mips::BI__builtin_msa_copy_u_d:
    case Mips::BI__builtin_msa_insve_d:
    case Mips::BI__builtin_msa_splati_d: i = 1; l = 0; u = 1; break;
    case Mips::BI__builtin_msa_sldi_d: i = 2; l = 0; u = 1; break;
    // Memory offsets and immediate loads.
    // These intrinsics take a signed 10 bit immediate.
    case Mips::BI__builtin_msa_ldi_b: i = 0; l = -128; u = 255; break;
    case Mips::BI__builtin_msa_ldi_h:
    case Mips::BI__builtin_msa_ldi_w:
    case Mips::BI__builtin_msa_ldi_d: i = 0; l = -512; u = 511; break;
    case Mips::BI__builtin_msa_ld_b: i = 1; l = -512; u = 511; m = 1; break;
    case Mips::BI__builtin_msa_ld_h: i = 1; l = -1024; u = 1022; m = 2; break;
    case Mips::BI__builtin_msa_ld_w: i = 1; l = -2048; u = 2044; m = 4; break;
    case Mips::BI__builtin_msa_ld_d: i = 1; l = -4096; u = 4088; m = 8; break;
    case Mips::BI__builtin_msa_st_b: i = 2; l = -512; u = 511; m = 1; break;
    case Mips::BI__builtin_msa_st_h: i = 2; l = -1024; u = 1022; m = 2; break;
    case Mips::BI__builtin_msa_st_w: i = 2; l = -2048; u = 2044; m = 4; break;
    case Mips::BI__builtin_msa_st_d: i = 2; l = -4096; u = 4088; m = 8; break;
    }
  
    if (!m)
      return SemaBuiltinConstantArgRange(TheCall, i, l, u);
  
    return SemaBuiltinConstantArgRange(TheCall, i, l, u) ||
           SemaBuiltinConstantArgMultiple(TheCall, i, m);
  }
  
  bool Sema::CheckPPCBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
    unsigned i = 0, l = 0, u = 0;
    bool Is64BitBltin = BuiltinID == PPC::BI__builtin_divde ||
                        BuiltinID == PPC::BI__builtin_divdeu ||
                        BuiltinID == PPC::BI__builtin_bpermd;
    bool IsTarget64Bit = Context.getTargetInfo()
                                .getTypeWidth(Context
                                              .getTargetInfo()
                                              .getIntPtrType()) == 64;
    bool IsBltinExtDiv = BuiltinID == PPC::BI__builtin_divwe ||
                         BuiltinID == PPC::BI__builtin_divweu ||
                         BuiltinID == PPC::BI__builtin_divde ||
                         BuiltinID == PPC::BI__builtin_divdeu;
  
    if (Is64BitBltin && !IsTarget64Bit)
      return Diag(TheCall->getBeginLoc(), diag::err_64_bit_builtin_32_bit_tgt)
             << TheCall->getSourceRange();
  
    if ((IsBltinExtDiv && !Context.getTargetInfo().hasFeature("extdiv")) ||
        (BuiltinID == PPC::BI__builtin_bpermd &&
         !Context.getTargetInfo().hasFeature("bpermd")))
      return Diag(TheCall->getBeginLoc(), diag::err_ppc_builtin_only_on_pwr7)
             << TheCall->getSourceRange();
  
    auto SemaVSXCheck = [&](CallExpr *TheCall) -> bool {
      if (!Context.getTargetInfo().hasFeature("vsx"))
        return Diag(TheCall->getBeginLoc(), diag::err_ppc_builtin_only_on_pwr7)
               << TheCall->getSourceRange();
      return false;
    };
  
    switch (BuiltinID) {
    default: return false;
    case PPC::BI__builtin_altivec_crypto_vshasigmaw:
    case PPC::BI__builtin_altivec_crypto_vshasigmad:
      return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1) ||
             SemaBuiltinConstantArgRange(TheCall, 2, 0, 15);
    case PPC::BI__builtin_altivec_dss:
      return SemaBuiltinConstantArgRange(TheCall, 0, 0, 3);
    case PPC::BI__builtin_tbegin:
    case PPC::BI__builtin_tend: i = 0; l = 0; u = 1; break;
    case PPC::BI__builtin_tsr: i = 0; l = 0; u = 7; break;
    case PPC::BI__builtin_tabortwc:
    case PPC::BI__builtin_tabortdc: i = 0; l = 0; u = 31; break;
    case PPC::BI__builtin_tabortwci:
    case PPC::BI__builtin_tabortdci:
      return SemaBuiltinConstantArgRange(TheCall, 0, 0, 31) ||
             SemaBuiltinConstantArgRange(TheCall, 2, 0, 31);
    case PPC::BI__builtin_altivec_dst:
    case PPC::BI__builtin_altivec_dstt:
    case PPC::BI__builtin_altivec_dstst:
    case PPC::BI__builtin_altivec_dststt:
      return SemaBuiltinConstantArgRange(TheCall, 2, 0, 3);
    case PPC::BI__builtin_vsx_xxpermdi:
    case PPC::BI__builtin_vsx_xxsldwi:
      return SemaBuiltinVSX(TheCall);
    case PPC::BI__builtin_unpack_vector_int128:
      return SemaVSXCheck(TheCall) ||
             SemaBuiltinConstantArgRange(TheCall, 1, 0, 1);
    case PPC::BI__builtin_pack_vector_int128:
      return SemaVSXCheck(TheCall);
    }
    return SemaBuiltinConstantArgRange(TheCall, i, l, u);
  }
  
  bool Sema::CheckSystemZBuiltinFunctionCall(unsigned BuiltinID,
                                             CallExpr *TheCall) {
    if (BuiltinID == SystemZ::BI__builtin_tabort) {
      Expr *Arg = TheCall->getArg(0);
      llvm::APSInt AbortCode(32);
      if (Arg->isIntegerConstantExpr(AbortCode, Context) &&
          AbortCode.getSExtValue() >= 0 && AbortCode.getSExtValue() < 256)
        return Diag(Arg->getBeginLoc(), diag::err_systemz_invalid_tabort_code)
               << Arg->getSourceRange();
    }
  
    // For intrinsics which take an immediate value as part of the instruction,
    // range check them here.
    unsigned i = 0, l = 0, u = 0;
    switch (BuiltinID) {
    default: return false;
    case SystemZ::BI__builtin_s390_lcbb: i = 1; l = 0; u = 15; break;
    case SystemZ::BI__builtin_s390_verimb:
    case SystemZ::BI__builtin_s390_verimh:
    case SystemZ::BI__builtin_s390_verimf:
    case SystemZ::BI__builtin_s390_verimg: i = 3; l = 0; u = 255; break;
    case SystemZ::BI__builtin_s390_vfaeb:
    case SystemZ::BI__builtin_s390_vfaeh:
    case SystemZ::BI__builtin_s390_vfaef:
    case SystemZ::BI__builtin_s390_vfaebs:
    case SystemZ::BI__builtin_s390_vfaehs:
    case SystemZ::BI__builtin_s390_vfaefs:
    case SystemZ::BI__builtin_s390_vfaezb:
    case SystemZ::BI__builtin_s390_vfaezh:
    case SystemZ::BI__builtin_s390_vfaezf:
    case SystemZ::BI__builtin_s390_vfaezbs:
    case SystemZ::BI__builtin_s390_vfaezhs:
    case SystemZ::BI__builtin_s390_vfaezfs: i = 2; l = 0; u = 15; break;
    case SystemZ::BI__builtin_s390_vfisb:
    case SystemZ::BI__builtin_s390_vfidb:
      return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15) ||
             SemaBuiltinConstantArgRange(TheCall, 2, 0, 15);
    case SystemZ::BI__builtin_s390_vftcisb:
    case SystemZ::BI__builtin_s390_vftcidb: i = 1; l = 0; u = 4095; break;
    case SystemZ::BI__builtin_s390_vlbb: i = 1; l = 0; u = 15; break;
    case SystemZ::BI__builtin_s390_vpdi: i = 2; l = 0; u = 15; break;
    case SystemZ::BI__builtin_s390_vsldb: i = 2; l = 0; u = 15; break;
    case SystemZ::BI__builtin_s390_vstrcb:
    case SystemZ::BI__builtin_s390_vstrch:
    case SystemZ::BI__builtin_s390_vstrcf:
    case SystemZ::BI__builtin_s390_vstrczb:
    case SystemZ::BI__builtin_s390_vstrczh:
    case SystemZ::BI__builtin_s390_vstrczf:
    case SystemZ::BI__builtin_s390_vstrcbs:
    case SystemZ::BI__builtin_s390_vstrchs:
    case SystemZ::BI__builtin_s390_vstrcfs:
    case SystemZ::BI__builtin_s390_vstrczbs:
    case SystemZ::BI__builtin_s390_vstrczhs:
    case SystemZ::BI__builtin_s390_vstrczfs: i = 3; l = 0; u = 15; break;
    case SystemZ::BI__builtin_s390_vmslg: i = 3; l = 0; u = 15; break;
    case SystemZ::BI__builtin_s390_vfminsb:
    case SystemZ::BI__builtin_s390_vfmaxsb:
    case SystemZ::BI__builtin_s390_vfmindb:
    case SystemZ::BI__builtin_s390_vfmaxdb: i = 2; l = 0; u = 15; break;
    case SystemZ::BI__builtin_s390_vsld: i = 2; l = 0; u = 7; break;
    case SystemZ::BI__builtin_s390_vsrd: i = 2; l = 0; u = 7; break;
    }
    return SemaBuiltinConstantArgRange(TheCall, i, l, u);
  }
  
  /// SemaBuiltinCpuSupports - Handle __builtin_cpu_supports(char *).
  /// This checks that the target supports __builtin_cpu_supports and
  /// that the string argument is constant and valid.
  static bool SemaBuiltinCpuSupports(Sema &S, CallExpr *TheCall) {
    Expr *Arg = TheCall->getArg(0);
  
    // Check if the argument is a string literal.
    if (!isa<StringLiteral>(Arg->IgnoreParenImpCasts()))
      return S.Diag(TheCall->getBeginLoc(), diag::err_expr_not_string_literal)
             << Arg->getSourceRange();
  
    // Check the contents of the string.
    StringRef Feature =
        cast<StringLiteral>(Arg->IgnoreParenImpCasts())->getString();
    if (!S.Context.getTargetInfo().validateCpuSupports(Feature))
      return S.Diag(TheCall->getBeginLoc(), diag::err_invalid_cpu_supports)
             << Arg->getSourceRange();
    return false;
  }
  
  /// SemaBuiltinCpuIs - Handle __builtin_cpu_is(char *).
  /// This checks that the target supports __builtin_cpu_is and
  /// that the string argument is constant and valid.
  static bool SemaBuiltinCpuIs(Sema &S, CallExpr *TheCall) {
    Expr *Arg = TheCall->getArg(0);
  
    // Check if the argument is a string literal.
    if (!isa<StringLiteral>(Arg->IgnoreParenImpCasts()))
      return S.Diag(TheCall->getBeginLoc(), diag::err_expr_not_string_literal)
             << Arg->getSourceRange();
  
    // Check the contents of the string.
    StringRef Feature =
        cast<StringLiteral>(Arg->IgnoreParenImpCasts())->getString();
    if (!S.Context.getTargetInfo().validateCpuIs(Feature))
      return S.Diag(TheCall->getBeginLoc(), diag::err_invalid_cpu_is)
             << Arg->getSourceRange();
    return false;
  }
  
  // Check if the rounding mode is legal.
  bool Sema::CheckX86BuiltinRoundingOrSAE(unsigned BuiltinID, CallExpr *TheCall) {
    // Indicates if this instruction has rounding control or just SAE.
    bool HasRC = false;
  
    unsigned ArgNum = 0;
    switch (BuiltinID) {
    default:
      return false;
    case X86::BI__builtin_ia32_vcvttsd2si32:
    case X86::BI__builtin_ia32_vcvttsd2si64:
    case X86::BI__builtin_ia32_vcvttsd2usi32:
    case X86::BI__builtin_ia32_vcvttsd2usi64:
    case X86::BI__builtin_ia32_vcvttss2si32:
    case X86::BI__builtin_ia32_vcvttss2si64:
    case X86::BI__builtin_ia32_vcvttss2usi32:
    case X86::BI__builtin_ia32_vcvttss2usi64:
      ArgNum = 1;
      break;
    case X86::BI__builtin_ia32_maxpd512:
    case X86::BI__builtin_ia32_maxps512:
    case X86::BI__builtin_ia32_minpd512:
    case X86::BI__builtin_ia32_minps512:
      ArgNum = 2;
      break;
    case X86::BI__builtin_ia32_cvtps2pd512_mask:
    case X86::BI__builtin_ia32_cvttpd2dq512_mask:
    case X86::BI__builtin_ia32_cvttpd2qq512_mask:
    case X86::BI__builtin_ia32_cvttpd2udq512_mask:
    case X86::BI__builtin_ia32_cvttpd2uqq512_mask:
    case X86::BI__builtin_ia32_cvttps2dq512_mask:
    case X86::BI__builtin_ia32_cvttps2qq512_mask:
    case X86::BI__builtin_ia32_cvttps2udq512_mask:
    case X86::BI__builtin_ia32_cvttps2uqq512_mask:
    case X86::BI__builtin_ia32_exp2pd_mask:
    case X86::BI__builtin_ia32_exp2ps_mask:
    case X86::BI__builtin_ia32_getexppd512_mask:
    case X86::BI__builtin_ia32_getexpps512_mask:
    case X86::BI__builtin_ia32_rcp28pd_mask:
    case X86::BI__builtin_ia32_rcp28ps_mask:
    case X86::BI__builtin_ia32_rsqrt28pd_mask:
    case X86::BI__builtin_ia32_rsqrt28ps_mask:
    case X86::BI__builtin_ia32_vcomisd:
    case X86::BI__builtin_ia32_vcomiss:
    case X86::BI__builtin_ia32_vcvtph2ps512_mask:
      ArgNum = 3;
      break;
    case X86::BI__builtin_ia32_cmppd512_mask:
    case X86::BI__builtin_ia32_cmpps512_mask:
    case X86::BI__builtin_ia32_cmpsd_mask:
    case X86::BI__builtin_ia32_cmpss_mask:
    case X86::BI__builtin_ia32_cvtss2sd_round_mask:
    case X86::BI__builtin_ia32_getexpsd128_round_mask:
    case X86::BI__builtin_ia32_getexpss128_round_mask:
    case X86::BI__builtin_ia32_getmantpd512_mask:
    case X86::BI__builtin_ia32_getmantps512_mask:
    case X86::BI__builtin_ia32_maxsd_round_mask:
    case X86::BI__builtin_ia32_maxss_round_mask:
    case X86::BI__builtin_ia32_minsd_round_mask:
    case X86::BI__builtin_ia32_minss_round_mask:
    case X86::BI__builtin_ia32_rcp28sd_round_mask:
    case X86::BI__builtin_ia32_rcp28ss_round_mask:
    case X86::BI__builtin_ia32_reducepd512_mask:
    case X86::BI__builtin_ia32_reduceps512_mask:
    case X86::BI__builtin_ia32_rndscalepd_mask:
    case X86::BI__builtin_ia32_rndscaleps_mask:
    case X86::BI__builtin_ia32_rsqrt28sd_round_mask:
    case X86::BI__builtin_ia32_rsqrt28ss_round_mask:
      ArgNum = 4;
      break;
    case X86::BI__builtin_ia32_fixupimmpd512_mask:
    case X86::BI__builtin_ia32_fixupimmpd512_maskz:
    case X86::BI__builtin_ia32_fixupimmps512_mask:
    case X86::BI__builtin_ia32_fixupimmps512_maskz:
    case X86::BI__builtin_ia32_fixupimmsd_mask:
    case X86::BI__builtin_ia32_fixupimmsd_maskz:
    case X86::BI__builtin_ia32_fixupimmss_mask:
    case X86::BI__builtin_ia32_fixupimmss_maskz:
    case X86::BI__builtin_ia32_getmantsd_round_mask:
    case X86::BI__builtin_ia32_getmantss_round_mask:
    case X86::BI__builtin_ia32_rangepd512_mask:
    case X86::BI__builtin_ia32_rangeps512_mask:
    case X86::BI__builtin_ia32_rangesd128_round_mask:
    case X86::BI__builtin_ia32_rangess128_round_mask:
    case X86::BI__builtin_ia32_reducesd_mask:
    case X86::BI__builtin_ia32_reducess_mask:
    case X86::BI__builtin_ia32_rndscalesd_round_mask:
    case X86::BI__builtin_ia32_rndscaless_round_mask:
      ArgNum = 5;
      break;
    case X86::BI__builtin_ia32_vcvtsd2si64:
    case X86::BI__builtin_ia32_vcvtsd2si32:
    case X86::BI__builtin_ia32_vcvtsd2usi32:
    case X86::BI__builtin_ia32_vcvtsd2usi64:
    case X86::BI__builtin_ia32_vcvtss2si32:
    case X86::BI__builtin_ia32_vcvtss2si64:
    case X86::BI__builtin_ia32_vcvtss2usi32:
    case X86::BI__builtin_ia32_vcvtss2usi64:
    case X86::BI__builtin_ia32_sqrtpd512:
    case X86::BI__builtin_ia32_sqrtps512:
      ArgNum = 1;
      HasRC = true;
      break;
    case X86::BI__builtin_ia32_addpd512:
    case X86::BI__builtin_ia32_addps512:
    case X86::BI__builtin_ia32_divpd512:
    case X86::BI__builtin_ia32_divps512:
    case X86::BI__builtin_ia32_mulpd512:
    case X86::BI__builtin_ia32_mulps512:
    case X86::BI__builtin_ia32_subpd512:
    case X86::BI__builtin_ia32_subps512:
    case X86::BI__builtin_ia32_cvtsi2sd64:
    case X86::BI__builtin_ia32_cvtsi2ss32:
    case X86::BI__builtin_ia32_cvtsi2ss64:
    case X86::BI__builtin_ia32_cvtusi2sd64:
    case X86::BI__builtin_ia32_cvtusi2ss32:
    case X86::BI__builtin_ia32_cvtusi2ss64:
      ArgNum = 2;
      HasRC = true;
      break;
    case X86::BI__builtin_ia32_cvtdq2ps512_mask:
    case X86::BI__builtin_ia32_cvtudq2ps512_mask:
    case X86::BI__builtin_ia32_cvtpd2ps512_mask:
    case X86::BI__builtin_ia32_cvtpd2dq512_mask:
    case X86::BI__builtin_ia32_cvtpd2qq512_mask:
    case X86::BI__builtin_ia32_cvtpd2udq512_mask:
    case X86::BI__builtin_ia32_cvtpd2uqq512_mask:
    case X86::BI__builtin_ia32_cvtps2dq512_mask:
    case X86::BI__builtin_ia32_cvtps2qq512_mask:
    case X86::BI__builtin_ia32_cvtps2udq512_mask:
    case X86::BI__builtin_ia32_cvtps2uqq512_mask:
    case X86::BI__builtin_ia32_cvtqq2pd512_mask:
    case X86::BI__builtin_ia32_cvtqq2ps512_mask:
    case X86::BI__builtin_ia32_cvtuqq2pd512_mask:
    case X86::BI__builtin_ia32_cvtuqq2ps512_mask:
      ArgNum = 3;
      HasRC = true;
      break;
    case X86::BI__builtin_ia32_addss_round_mask:
    case X86::BI__builtin_ia32_addsd_round_mask:
    case X86::BI__builtin_ia32_divss_round_mask:
    case X86::BI__builtin_ia32_divsd_round_mask:
    case X86::BI__builtin_ia32_mulss_round_mask:
    case X86::BI__builtin_ia32_mulsd_round_mask:
    case X86::BI__builtin_ia32_subss_round_mask:
    case X86::BI__builtin_ia32_subsd_round_mask:
    case X86::BI__builtin_ia32_scalefpd512_mask:
    case X86::BI__builtin_ia32_scalefps512_mask:
    case X86::BI__builtin_ia32_scalefsd_round_mask:
    case X86::BI__builtin_ia32_scalefss_round_mask:
    case X86::BI__builtin_ia32_cvtsd2ss_round_mask:
    case X86::BI__builtin_ia32_sqrtsd_round_mask:
    case X86::BI__builtin_ia32_sqrtss_round_mask:
    case X86::BI__builtin_ia32_vfmaddsd3_mask:
    case X86::BI__builtin_ia32_vfmaddsd3_maskz:
    case X86::BI__builtin_ia32_vfmaddsd3_mask3:
    case X86::BI__builtin_ia32_vfmaddss3_mask:
    case X86::BI__builtin_ia32_vfmaddss3_maskz:
    case X86::BI__builtin_ia32_vfmaddss3_mask3:
    case X86::BI__builtin_ia32_vfmaddpd512_mask:
    case X86::BI__builtin_ia32_vfmaddpd512_maskz:
    case X86::BI__builtin_ia32_vfmaddpd512_mask3:
    case X86::BI__builtin_ia32_vfmsubpd512_mask3:
    case X86::BI__builtin_ia32_vfmaddps512_mask:
    case X86::BI__builtin_ia32_vfmaddps512_maskz:
    case X86::BI__builtin_ia32_vfmaddps512_mask3:
    case X86::BI__builtin_ia32_vfmsubps512_mask3:
    case X86::BI__builtin_ia32_vfmaddsubpd512_mask:
    case X86::BI__builtin_ia32_vfmaddsubpd512_maskz:
    case X86::BI__builtin_ia32_vfmaddsubpd512_mask3:
    case X86::BI__builtin_ia32_vfmsubaddpd512_mask3:
    case X86::BI__builtin_ia32_vfmaddsubps512_mask:
    case X86::BI__builtin_ia32_vfmaddsubps512_maskz:
    case X86::BI__builtin_ia32_vfmaddsubps512_mask3:
    case X86::BI__builtin_ia32_vfmsubaddps512_mask3:
      ArgNum = 4;
      HasRC = true;
      break;
    }
  
    llvm::APSInt Result;
  
    // We can't check the value of a dependent argument.
    Expr *Arg = TheCall->getArg(ArgNum);
    if (Arg->isTypeDependent() || Arg->isValueDependent())
      return false;
  
    // Check constant-ness first.
    if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
      return true;
  
    // Make sure rounding mode is either ROUND_CUR_DIRECTION or ROUND_NO_EXC bit
    // is set. If the intrinsic has rounding control(bits 1:0), make sure its only
    // combined with ROUND_NO_EXC. If the intrinsic does not have rounding
    // control, allow ROUND_NO_EXC and ROUND_CUR_DIRECTION together.
    if (Result == 4/*ROUND_CUR_DIRECTION*/ ||
        Result == 8/*ROUND_NO_EXC*/ ||
        (!HasRC && Result == 12/*ROUND_CUR_DIRECTION|ROUND_NO_EXC*/) ||
        (HasRC && Result.getZExtValue() >= 8 && Result.getZExtValue() <= 11))
      return false;
  
    return Diag(TheCall->getBeginLoc(), diag::err_x86_builtin_invalid_rounding)
           << Arg->getSourceRange();
  }
  
  // Check if the gather/scatter scale is legal.
  bool Sema::CheckX86BuiltinGatherScatterScale(unsigned BuiltinID,
                                               CallExpr *TheCall) {
    unsigned ArgNum = 0;
    switch (BuiltinID) {
    default:
      return false;
    case X86::BI__builtin_ia32_gatherpfdpd:
    case X86::BI__builtin_ia32_gatherpfdps:
    case X86::BI__builtin_ia32_gatherpfqpd:
    case X86::BI__builtin_ia32_gatherpfqps:
    case X86::BI__builtin_ia32_scatterpfdpd:
    case X86::BI__builtin_ia32_scatterpfdps:
    case X86::BI__builtin_ia32_scatterpfqpd:
    case X86::BI__builtin_ia32_scatterpfqps:
      ArgNum = 3;
      break;
    case X86::BI__builtin_ia32_gatherd_pd:
    case X86::BI__builtin_ia32_gatherd_pd256:
    case X86::BI__builtin_ia32_gatherq_pd:
    case X86::BI__builtin_ia32_gatherq_pd256:
    case X86::BI__builtin_ia32_gatherd_ps:
    case X86::BI__builtin_ia32_gatherd_ps256:
    case X86::BI__builtin_ia32_gatherq_ps:
    case X86::BI__builtin_ia32_gatherq_ps256:
    case X86::BI__builtin_ia32_gatherd_q:
    case X86::BI__builtin_ia32_gatherd_q256:
    case X86::BI__builtin_ia32_gatherq_q:
    case X86::BI__builtin_ia32_gatherq_q256:
    case X86::BI__builtin_ia32_gatherd_d:
    case X86::BI__builtin_ia32_gatherd_d256:
    case X86::BI__builtin_ia32_gatherq_d:
    case X86::BI__builtin_ia32_gatherq_d256:
    case X86::BI__builtin_ia32_gather3div2df:
    case X86::BI__builtin_ia32_gather3div2di:
    case X86::BI__builtin_ia32_gather3div4df:
    case X86::BI__builtin_ia32_gather3div4di:
    case X86::BI__builtin_ia32_gather3div4sf:
    case X86::BI__builtin_ia32_gather3div4si:
    case X86::BI__builtin_ia32_gather3div8sf:
    case X86::BI__builtin_ia32_gather3div8si:
    case X86::BI__builtin_ia32_gather3siv2df:
    case X86::BI__builtin_ia32_gather3siv2di:
    case X86::BI__builtin_ia32_gather3siv4df:
    case X86::BI__builtin_ia32_gather3siv4di:
    case X86::BI__builtin_ia32_gather3siv4sf:
    case X86::BI__builtin_ia32_gather3siv4si:
    case X86::BI__builtin_ia32_gather3siv8sf:
    case X86::BI__builtin_ia32_gather3siv8si:
    case X86::BI__builtin_ia32_gathersiv8df:
    case X86::BI__builtin_ia32_gathersiv16sf:
    case X86::BI__builtin_ia32_gatherdiv8df:
    case X86::BI__builtin_ia32_gatherdiv16sf:
    case X86::BI__builtin_ia32_gathersiv8di:
    case X86::BI__builtin_ia32_gathersiv16si:
    case X86::BI__builtin_ia32_gatherdiv8di:
    case X86::BI__builtin_ia32_gatherdiv16si:
    case X86::BI__builtin_ia32_scatterdiv2df:
    case X86::BI__builtin_ia32_scatterdiv2di:
    case X86::BI__builtin_ia32_scatterdiv4df:
    case X86::BI__builtin_ia32_scatterdiv4di:
    case X86::BI__builtin_ia32_scatterdiv4sf:
    case X86::BI__builtin_ia32_scatterdiv4si:
    case X86::BI__builtin_ia32_scatterdiv8sf:
    case X86::BI__builtin_ia32_scatterdiv8si:
    case X86::BI__builtin_ia32_scattersiv2df:
    case X86::BI__builtin_ia32_scattersiv2di:
    case X86::BI__builtin_ia32_scattersiv4df:
    case X86::BI__builtin_ia32_scattersiv4di:
    case X86::BI__builtin_ia32_scattersiv4sf:
    case X86::BI__builtin_ia32_scattersiv4si:
    case X86::BI__builtin_ia32_scattersiv8sf:
    case X86::BI__builtin_ia32_scattersiv8si:
    case X86::BI__builtin_ia32_scattersiv8df:
    case X86::BI__builtin_ia32_scattersiv16sf:
    case X86::BI__builtin_ia32_scatterdiv8df:
    case X86::BI__builtin_ia32_scatterdiv16sf:
    case X86::BI__builtin_ia32_scattersiv8di:
    case X86::BI__builtin_ia32_scattersiv16si:
    case X86::BI__builtin_ia32_scatterdiv8di:
    case X86::BI__builtin_ia32_scatterdiv16si:
      ArgNum = 4;
      break;
    }
  
    llvm::APSInt Result;
  
    // We can't check the value of a dependent argument.
    Expr *Arg = TheCall->getArg(ArgNum);
    if (Arg->isTypeDependent() || Arg->isValueDependent())
      return false;
  
    // Check constant-ness first.
    if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
      return true;
  
    if (Result == 1 || Result == 2 || Result == 4 || Result == 8)
      return false;
  
    return Diag(TheCall->getBeginLoc(), diag::err_x86_builtin_invalid_scale)
           << Arg->getSourceRange();
  }
  
  static bool isX86_32Builtin(unsigned BuiltinID) {
    // These builtins only work on x86-32 targets.
    switch (BuiltinID) {
    case X86::BI__builtin_ia32_readeflags_u32:
    case X86::BI__builtin_ia32_writeeflags_u32:
      return true;
    }
  
    return false;
  }
  
  bool Sema::CheckX86BuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
    if (BuiltinID == X86::BI__builtin_cpu_supports)
      return SemaBuiltinCpuSupports(*this, TheCall);
  
    if (BuiltinID == X86::BI__builtin_cpu_is)
      return SemaBuiltinCpuIs(*this, TheCall);
  
    // Check for 32-bit only builtins on a 64-bit target.
    const llvm::Triple &TT = Context.getTargetInfo().getTriple();
    if (TT.getArch() != llvm::Triple::x86 && isX86_32Builtin(BuiltinID))
      return Diag(TheCall->getCallee()->getBeginLoc(),
                  diag::err_32_bit_builtin_64_bit_tgt);
  
    // If the intrinsic has rounding or SAE make sure its valid.
    if (CheckX86BuiltinRoundingOrSAE(BuiltinID, TheCall))
      return true;
  
    // If the intrinsic has a gather/scatter scale immediate make sure its valid.
    if (CheckX86BuiltinGatherScatterScale(BuiltinID, TheCall))
      return true;
  
    // For intrinsics which take an immediate value as part of the instruction,
    // range check them here.
    int i = 0, l = 0, u = 0;
    switch (BuiltinID) {
    default:
      return false;
    case X86::BI__builtin_ia32_vec_ext_v2si:
    case X86::BI__builtin_ia32_vec_ext_v2di:
    case X86::BI__builtin_ia32_vextractf128_pd256:
    case X86::BI__builtin_ia32_vextractf128_ps256:
    case X86::BI__builtin_ia32_vextractf128_si256:
    case X86::BI__builtin_ia32_extract128i256:
    case X86::BI__builtin_ia32_extractf64x4_mask:
    case X86::BI__builtin_ia32_extracti64x4_mask:
    case X86::BI__builtin_ia32_extractf32x8_mask:
    case X86::BI__builtin_ia32_extracti32x8_mask:
    case X86::BI__builtin_ia32_extractf64x2_256_mask:
    case X86::BI__builtin_ia32_extracti64x2_256_mask:
    case X86::BI__builtin_ia32_extractf32x4_256_mask:
    case X86::BI__builtin_ia32_extracti32x4_256_mask:
      i = 1; l = 0; u = 1;
      break;
    case X86::BI__builtin_ia32_vec_set_v2di:
    case X86::BI__builtin_ia32_vinsertf128_pd256:
    case X86::BI__builtin_ia32_vinsertf128_ps256:
    case X86::BI__builtin_ia32_vinsertf128_si256:
    case X86::BI__builtin_ia32_insert128i256:
    case X86::BI__builtin_ia32_insertf32x8:
    case X86::BI__builtin_ia32_inserti32x8:
    case X86::BI__builtin_ia32_insertf64x4:
    case X86::BI__builtin_ia32_inserti64x4:
    case X86::BI__builtin_ia32_insertf64x2_256:
    case X86::BI__builtin_ia32_inserti64x2_256:
    case X86::BI__builtin_ia32_insertf32x4_256:
    case X86::BI__builtin_ia32_inserti32x4_256:
      i = 2; l = 0; u = 1;
      break;
    case X86::BI__builtin_ia32_vpermilpd:
    case X86::BI__builtin_ia32_vec_ext_v4hi:
    case X86::BI__builtin_ia32_vec_ext_v4si:
    case X86::BI__builtin_ia32_vec_ext_v4sf:
    case X86::BI__builtin_ia32_vec_ext_v4di:
    case X86::BI__builtin_ia32_extractf32x4_mask:
    case X86::BI__builtin_ia32_extracti32x4_mask:
    case X86::BI__builtin_ia32_extractf64x2_512_mask:
    case X86::BI__builtin_ia32_extracti64x2_512_mask:
      i = 1; l = 0; u = 3;
      break;
    case X86::BI_mm_prefetch:
    case X86::BI__builtin_ia32_vec_ext_v8hi:
    case X86::BI__builtin_ia32_vec_ext_v8si:
      i = 1; l = 0; u = 7;
      break;
    case X86::BI__builtin_ia32_sha1rnds4:
    case X86::BI__builtin_ia32_blendpd:
    case X86::BI__builtin_ia32_shufpd:
    case X86::BI__builtin_ia32_vec_set_v4hi:
    case X86::BI__builtin_ia32_vec_set_v4si:
    case X86::BI__builtin_ia32_vec_set_v4di:
    case X86::BI__builtin_ia32_shuf_f32x4_256:
    case X86::BI__builtin_ia32_shuf_f64x2_256:
    case X86::BI__builtin_ia32_shuf_i32x4_256:
    case X86::BI__builtin_ia32_shuf_i64x2_256:
    case X86::BI__builtin_ia32_insertf64x2_512:
    case X86::BI__builtin_ia32_inserti64x2_512:
    case X86::BI__builtin_ia32_insertf32x4:
    case X86::BI__builtin_ia32_inserti32x4:
      i = 2; l = 0; u = 3;
      break;
    case X86::BI__builtin_ia32_vpermil2pd:
    case X86::BI__builtin_ia32_vpermil2pd256:
    case X86::BI__builtin_ia32_vpermil2ps:
    case X86::BI__builtin_ia32_vpermil2ps256:
      i = 3; l = 0; u = 3;
      break;
    case X86::BI__builtin_ia32_cmpb128_mask:
    case X86::BI__builtin_ia32_cmpw128_mask:
    case X86::BI__builtin_ia32_cmpd128_mask:
    case X86::BI__builtin_ia32_cmpq128_mask:
    case X86::BI__builtin_ia32_cmpb256_mask:
    case X86::BI__builtin_ia32_cmpw256_mask:
    case X86::BI__builtin_ia32_cmpd256_mask:
    case X86::BI__builtin_ia32_cmpq256_mask:
    case X86::BI__builtin_ia32_cmpb512_mask:
    case X86::BI__builtin_ia32_cmpw512_mask:
    case X86::BI__builtin_ia32_cmpd512_mask:
    case X86::BI__builtin_ia32_cmpq512_mask:
    case X86::BI__builtin_ia32_ucmpb128_mask:
    case X86::BI__builtin_ia32_ucmpw128_mask:
    case X86::BI__builtin_ia32_ucmpd128_mask:
    case X86::BI__builtin_ia32_ucmpq128_mask:
    case X86::BI__builtin_ia32_ucmpb256_mask:
    case X86::BI__builtin_ia32_ucmpw256_mask:
    case X86::BI__builtin_ia32_ucmpd256_mask:
    case X86::BI__builtin_ia32_ucmpq256_mask:
    case X86::BI__builtin_ia32_ucmpb512_mask:
    case X86::BI__builtin_ia32_ucmpw512_mask:
    case X86::BI__builtin_ia32_ucmpd512_mask:
    case X86::BI__builtin_ia32_ucmpq512_mask:
    case X86::BI__builtin_ia32_vpcomub:
    case X86::BI__builtin_ia32_vpcomuw:
    case X86::BI__builtin_ia32_vpcomud:
    case X86::BI__builtin_ia32_vpcomuq:
    case X86::BI__builtin_ia32_vpcomb:
    case X86::BI__builtin_ia32_vpcomw:
    case X86::BI__builtin_ia32_vpcomd:
    case X86::BI__builtin_ia32_vpcomq:
    case X86::BI__builtin_ia32_vec_set_v8hi:
    case X86::BI__builtin_ia32_vec_set_v8si:
      i = 2; l = 0; u = 7;
      break;
    case X86::BI__builtin_ia32_vpermilpd256:
    case X86::BI__builtin_ia32_roundps:
    case X86::BI__builtin_ia32_roundpd:
    case X86::BI__builtin_ia32_roundps256:
    case X86::BI__builtin_ia32_roundpd256:
    case X86::BI__builtin_ia32_getmantpd128_mask:
    case X86::BI__builtin_ia32_getmantpd256_mask:
    case X86::BI__builtin_ia32_getmantps128_mask:
    case X86::BI__builtin_ia32_getmantps256_mask:
    case X86::BI__builtin_ia32_getmantpd512_mask:
    case X86::BI__builtin_ia32_getmantps512_mask:
    case X86::BI__builtin_ia32_vec_ext_v16qi:
    case X86::BI__builtin_ia32_vec_ext_v16hi:
      i = 1; l = 0; u = 15;
      break;
    case X86::BI__builtin_ia32_pblendd128:
    case X86::BI__builtin_ia32_blendps:
    case X86::BI__builtin_ia32_blendpd256:
    case X86::BI__builtin_ia32_shufpd256:
    case X86::BI__builtin_ia32_roundss:
    case X86::BI__builtin_ia32_roundsd:
    case X86::BI__builtin_ia32_rangepd128_mask:
    case X86::BI__builtin_ia32_rangepd256_mask:
    case X86::BI__builtin_ia32_rangepd512_mask:
    case X86::BI__builtin_ia32_rangeps128_mask:
    case X86::BI__builtin_ia32_rangeps256_mask:
    case X86::BI__builtin_ia32_rangeps512_mask:
    case X86::BI__builtin_ia32_getmantsd_round_mask:
    case X86::BI__builtin_ia32_getmantss_round_mask:
    case X86::BI__builtin_ia32_vec_set_v16qi:
    case X86::BI__builtin_ia32_vec_set_v16hi:
      i = 2; l = 0; u = 15;
      break;
    case X86::BI__builtin_ia32_vec_ext_v32qi:
      i = 1; l = 0; u = 31;
      break;
    case X86::BI__builtin_ia32_cmpps:
    case X86::BI__builtin_ia32_cmpss:
    case X86::BI__builtin_ia32_cmppd:
    case X86::BI__builtin_ia32_cmpsd:
    case X86::BI__builtin_ia32_cmpps256:
    case X86::BI__builtin_ia32_cmppd256:
    case X86::BI__builtin_ia32_cmpps128_mask:
    case X86::BI__builtin_ia32_cmppd128_mask:
    case X86::BI__builtin_ia32_cmpps256_mask:
    case X86::BI__builtin_ia32_cmppd256_mask:
    case X86::BI__builtin_ia32_cmpps512_mask:
    case X86::BI__builtin_ia32_cmppd512_mask:
    case X86::BI__builtin_ia32_cmpsd_mask:
    case X86::BI__builtin_ia32_cmpss_mask:
    case X86::BI__builtin_ia32_vec_set_v32qi:
      i = 2; l = 0; u = 31;
      break;
    case X86::BI__builtin_ia32_permdf256:
    case X86::BI__builtin_ia32_permdi256:
    case X86::BI__builtin_ia32_permdf512:
    case X86::BI__builtin_ia32_permdi512:
    case X86::BI__builtin_ia32_vpermilps:
    case X86::BI__builtin_ia32_vpermilps256:
    case X86::BI__builtin_ia32_vpermilpd512:
    case X86::BI__builtin_ia32_vpermilps512:
    case X86::BI__builtin_ia32_pshufd:
    case X86::BI__builtin_ia32_pshufd256:
    case X86::BI__builtin_ia32_pshufd512:
    case X86::BI__builtin_ia32_pshufhw:
    case X86::BI__builtin_ia32_pshufhw256:
    case X86::BI__builtin_ia32_pshufhw512:
    case X86::BI__builtin_ia32_pshuflw:
    case X86::BI__builtin_ia32_pshuflw256:
    case X86::BI__builtin_ia32_pshuflw512:
    case X86::BI__builtin_ia32_vcvtps2ph:
    case X86::BI__builtin_ia32_vcvtps2ph_mask:
    case X86::BI__builtin_ia32_vcvtps2ph256:
    case X86::BI__builtin_ia32_vcvtps2ph256_mask:
    case X86::BI__builtin_ia32_vcvtps2ph512_mask:
    case X86::BI__builtin_ia32_rndscaleps_128_mask:
    case X86::BI__builtin_ia32_rndscalepd_128_mask:
    case X86::BI__builtin_ia32_rndscaleps_256_mask:
    case X86::BI__builtin_ia32_rndscalepd_256_mask:
    case X86::BI__builtin_ia32_rndscaleps_mask:
    case X86::BI__builtin_ia32_rndscalepd_mask:
    case X86::BI__builtin_ia32_reducepd128_mask:
    case X86::BI__builtin_ia32_reducepd256_mask:
    case X86::BI__builtin_ia32_reducepd512_mask:
    case X86::BI__builtin_ia32_reduceps128_mask:
    case X86::BI__builtin_ia32_reduceps256_mask:
    case X86::BI__builtin_ia32_reduceps512_mask:
    case X86::BI__builtin_ia32_prold512:
    case X86::BI__builtin_ia32_prolq512:
    case X86::BI__builtin_ia32_prold128:
    case X86::BI__builtin_ia32_prold256:
    case X86::BI__builtin_ia32_prolq128:
    case X86::BI__builtin_ia32_prolq256:
    case X86::BI__builtin_ia32_prord512:
    case X86::BI__builtin_ia32_prorq512:
    case X86::BI__builtin_ia32_prord128:
    case X86::BI__builtin_ia32_prord256:
    case X86::BI__builtin_ia32_prorq128:
    case X86::BI__builtin_ia32_prorq256:
    case X86::BI__builtin_ia32_fpclasspd128_mask:
    case X86::BI__builtin_ia32_fpclasspd256_mask:
    case X86::BI__builtin_ia32_fpclassps128_mask:
    case X86::BI__builtin_ia32_fpclassps256_mask:
    case X86::BI__builtin_ia32_fpclassps512_mask:
    case X86::BI__builtin_ia32_fpclasspd512_mask:
    case X86::BI__builtin_ia32_fpclasssd_mask:
    case X86::BI__builtin_ia32_fpclassss_mask:
    case X86::BI__builtin_ia32_pslldqi128_byteshift:
    case X86::BI__builtin_ia32_pslldqi256_byteshift:
    case X86::BI__builtin_ia32_pslldqi512_byteshift:
    case X86::BI__builtin_ia32_psrldqi128_byteshift:
    case X86::BI__builtin_ia32_psrldqi256_byteshift:
    case X86::BI__builtin_ia32_psrldqi512_byteshift:
    case X86::BI__builtin_ia32_kshiftliqi:
    case X86::BI__builtin_ia32_kshiftlihi:
    case X86::BI__builtin_ia32_kshiftlisi:
    case X86::BI__builtin_ia32_kshiftlidi:
    case X86::BI__builtin_ia32_kshiftriqi:
    case X86::BI__builtin_ia32_kshiftrihi:
    case X86::BI__builtin_ia32_kshiftrisi:
    case X86::BI__builtin_ia32_kshiftridi:
      i = 1; l = 0; u = 255;
      break;
    case X86::BI__builtin_ia32_vperm2f128_pd256:
    case X86::BI__builtin_ia32_vperm2f128_ps256:
    case X86::BI__builtin_ia32_vperm2f128_si256:
    case X86::BI__builtin_ia32_permti256:
    case X86::BI__builtin_ia32_pblendw128:
    case X86::BI__builtin_ia32_pblendw256:
    case X86::BI__builtin_ia32_blendps256:
    case X86::BI__builtin_ia32_pblendd256:
    case X86::BI__builtin_ia32_palignr128:
    case X86::BI__builtin_ia32_palignr256:
    case X86::BI__builtin_ia32_palignr512:
    case X86::BI__builtin_ia32_alignq512:
    case X86::BI__builtin_ia32_alignd512:
    case X86::BI__builtin_ia32_alignd128:
    case X86::BI__builtin_ia32_alignd256:
    case X86::BI__builtin_ia32_alignq128:
    case X86::BI__builtin_ia32_alignq256:
    case X86::BI__builtin_ia32_vcomisd:
    case X86::BI__builtin_ia32_vcomiss:
    case X86::BI__builtin_ia32_shuf_f32x4:
    case X86::BI__builtin_ia32_shuf_f64x2:
    case X86::BI__builtin_ia32_shuf_i32x4:
    case X86::BI__builtin_ia32_shuf_i64x2:
    case X86::BI__builtin_ia32_shufpd512:
    case X86::BI__builtin_ia32_shufps:
    case X86::BI__builtin_ia32_shufps256:
    case X86::BI__builtin_ia32_shufps512:
    case X86::BI__builtin_ia32_dbpsadbw128:
    case X86::BI__builtin_ia32_dbpsadbw256:
    case X86::BI__builtin_ia32_dbpsadbw512:
    case X86::BI__builtin_ia32_vpshldd128:
    case X86::BI__builtin_ia32_vpshldd256:
    case X86::BI__builtin_ia32_vpshldd512:
    case X86::BI__builtin_ia32_vpshldq128:
    case X86::BI__builtin_ia32_vpshldq256:
    case X86::BI__builtin_ia32_vpshldq512:
    case X86::BI__builtin_ia32_vpshldw128:
    case X86::BI__builtin_ia32_vpshldw256:
    case X86::BI__builtin_ia32_vpshldw512:
    case X86::BI__builtin_ia32_vpshrdd128:
    case X86::BI__builtin_ia32_vpshrdd256:
    case X86::BI__builtin_ia32_vpshrdd512:
    case X86::BI__builtin_ia32_vpshrdq128:
    case X86::BI__builtin_ia32_vpshrdq256:
    case X86::BI__builtin_ia32_vpshrdq512:
    case X86::BI__builtin_ia32_vpshrdw128:
    case X86::BI__builtin_ia32_vpshrdw256:
    case X86::BI__builtin_ia32_vpshrdw512:
      i = 2; l = 0; u = 255;
      break;
    case X86::BI__builtin_ia32_fixupimmpd512_mask:
    case X86::BI__builtin_ia32_fixupimmpd512_maskz:
    case X86::BI__builtin_ia32_fixupimmps512_mask:
    case X86::BI__builtin_ia32_fixupimmps512_maskz:
    case X86::BI__builtin_ia32_fixupimmsd_mask:
    case X86::BI__builtin_ia32_fixupimmsd_maskz:
    case X86::BI__builtin_ia32_fixupimmss_mask:
    case X86::BI__builtin_ia32_fixupimmss_maskz:
    case X86::BI__builtin_ia32_fixupimmpd128_mask:
    case X86::BI__builtin_ia32_fixupimmpd128_maskz:
    case X86::BI__builtin_ia32_fixupimmpd256_mask:
    case X86::BI__builtin_ia32_fixupimmpd256_maskz:
    case X86::BI__builtin_ia32_fixupimmps128_mask:
    case X86::BI__builtin_ia32_fixupimmps128_maskz:
    case X86::BI__builtin_ia32_fixupimmps256_mask:
    case X86::BI__builtin_ia32_fixupimmps256_maskz:
    case X86::BI__builtin_ia32_pternlogd512_mask:
    case X86::BI__builtin_ia32_pternlogd512_maskz:
    case X86::BI__builtin_ia32_pternlogq512_mask:
    case X86::BI__builtin_ia32_pternlogq512_maskz:
    case X86::BI__builtin_ia32_pternlogd128_mask:
    case X86::BI__builtin_ia32_pternlogd128_maskz:
    case X86::BI__builtin_ia32_pternlogd256_mask:
    case X86::BI__builtin_ia32_pternlogd256_maskz:
    case X86::BI__builtin_ia32_pternlogq128_mask:
    case X86::BI__builtin_ia32_pternlogq128_maskz:
    case X86::BI__builtin_ia32_pternlogq256_mask:
    case X86::BI__builtin_ia32_pternlogq256_maskz:
      i = 3; l = 0; u = 255;
      break;
    case X86::BI__builtin_ia32_gatherpfdpd:
    case X86::BI__builtin_ia32_gatherpfdps:
    case X86::BI__builtin_ia32_gatherpfqpd:
    case X86::BI__builtin_ia32_gatherpfqps:
    case X86::BI__builtin_ia32_scatterpfdpd:
    case X86::BI__builtin_ia32_scatterpfdps:
    case X86::BI__builtin_ia32_scatterpfqpd:
    case X86::BI__builtin_ia32_scatterpfqps:
      i = 4; l = 2; u = 3;
      break;
    case X86::BI__builtin_ia32_reducesd_mask:
    case X86::BI__builtin_ia32_reducess_mask:
    case X86::BI__builtin_ia32_rndscalesd_round_mask:
    case X86::BI__builtin_ia32_rndscaless_round_mask:
      i = 4; l = 0; u = 255;
      break;
    }
  
    // Note that we don't force a hard error on the range check here, allowing
    // template-generated or macro-generated dead code to potentially have out-of-
    // range values. These need to code generate, but don't need to necessarily
    // make any sense. We use a warning that defaults to an error.
    return SemaBuiltinConstantArgRange(TheCall, i, l, u, /*RangeIsError*/ false);
  }
  
  /// Given a FunctionDecl's FormatAttr, attempts to populate the FomatStringInfo
  /// parameter with the FormatAttr's correct format_idx and firstDataArg.
  /// Returns true when the format fits the function and the FormatStringInfo has
  /// been populated.
  bool Sema::getFormatStringInfo(const FormatAttr *Format, bool IsCXXMember,
                                 FormatStringInfo *FSI) {
    FSI->HasVAListArg = Format->getFirstArg() == 0;
    FSI->FormatIdx = Format->getFormatIdx() - 1;
    FSI->FirstDataArg = FSI->HasVAListArg ? 0 : Format->getFirstArg() - 1;
  
    // The way the format attribute works in GCC, the implicit this argument
    // of member functions is counted. However, it doesn't appear in our own
    // lists, so decrement format_idx in that case.
    if (IsCXXMember) {
      if(FSI->FormatIdx == 0)
        return false;
      --FSI->FormatIdx;
      if (FSI->FirstDataArg != 0)
        --FSI->FirstDataArg;
    }
    return true;
  }
  
  /// Checks if a the given expression evaluates to null.
  ///
  /// Returns true if the value evaluates to null.
  static bool CheckNonNullExpr(Sema &S, const Expr *Expr) {
    // If the expression has non-null type, it doesn't evaluate to null.
    if (auto nullability
          = Expr->IgnoreImplicit()->getType()->getNullability(S.Context)) {
      if (*nullability == NullabilityKind::NonNull)
        return false;
    }
  
    // As a special case, transparent unions initialized with zero are
    // considered null for the purposes of the nonnull attribute.
    if (const RecordType *UT = Expr->getType()->getAsUnionType()) {
      if (UT->getDecl()->hasAttr<TransparentUnionAttr>())
        if (const CompoundLiteralExpr *CLE =
            dyn_cast<CompoundLiteralExpr>(Expr))
          if (const InitListExpr *ILE =
              dyn_cast<InitListExpr>(CLE->getInitializer()))
            Expr = ILE->getInit(0);
    }
  
    bool Result;
    return (!Expr->isValueDependent() &&
            Expr->EvaluateAsBooleanCondition(Result, S.Context) &&
            !Result);
  }
  
  static void CheckNonNullArgument(Sema &S,
                                   const Expr *ArgExpr,
                                   SourceLocation CallSiteLoc) {
    if (CheckNonNullExpr(S, ArgExpr))
      S.DiagRuntimeBehavior(CallSiteLoc, ArgExpr,
                            S.PDiag(diag::warn_null_arg)
                                << ArgExpr->getSourceRange());
  }
  
  bool Sema::GetFormatNSStringIdx(const FormatAttr *Format, unsigned &Idx) {
    FormatStringInfo FSI;
    if ((GetFormatStringType(Format) == FST_NSString) &&
        getFormatStringInfo(Format, false, &FSI)) {
      Idx = FSI.FormatIdx;
      return true;
    }
    return false;
  }
  
  /// Diagnose use of %s directive in an NSString which is being passed
  /// as formatting string to formatting method.
  static void
  DiagnoseCStringFormatDirectiveInCFAPI(Sema &S,
                                          const NamedDecl *FDecl,
                                          Expr **Args,
                                          unsigned NumArgs) {
    unsigned Idx = 0;
    bool Format = false;
    ObjCStringFormatFamily SFFamily = FDecl->getObjCFStringFormattingFamily();
    if (SFFamily == ObjCStringFormatFamily::SFF_CFString) {
      Idx = 2;
      Format = true;
    }
    else
      for (const auto *I : FDecl->specific_attrs<FormatAttr>()) {
        if (S.GetFormatNSStringIdx(I, Idx)) {
          Format = true;
          break;
        }
      }
    if (!Format || NumArgs <= Idx)
      return;
    const Expr *FormatExpr = Args[Idx];
    if (const CStyleCastExpr *CSCE = dyn_cast<CStyleCastExpr>(FormatExpr))
      FormatExpr = CSCE->getSubExpr();
    const StringLiteral *FormatString;
    if (const ObjCStringLiteral *OSL =
        dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts()))
      FormatString = OSL->getString();
    else
      FormatString = dyn_cast<StringLiteral>(FormatExpr->IgnoreParenImpCasts());
    if (!FormatString)
      return;
    if (S.FormatStringHasSArg(FormatString)) {
      S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
        << "%s" << 1 << 1;
      S.Diag(FDecl->getLocation(), diag::note_entity_declared_at)
        << FDecl->getDeclName();
    }
  }
  
  /// Determine whether the given type has a non-null nullability annotation.
  static bool isNonNullType(ASTContext &ctx, QualType type) {
    if (auto nullability = type->getNullability(ctx))
      return *nullability == NullabilityKind::NonNull;
  
    return false;
  }
  
  static void CheckNonNullArguments(Sema &S,
                                    const NamedDecl *FDecl,
                                    const FunctionProtoType *Proto,
                                    ArrayRef<const Expr *> Args,
                                    SourceLocation CallSiteLoc) {
    assert((FDecl || Proto) && "Need a function declaration or prototype");
  
    // Already checked by by constant evaluator.
    if (S.isConstantEvaluated())
      return;
    // Check the attributes attached to the method/function itself.
    llvm::SmallBitVector NonNullArgs;
    if (FDecl) {
      // Handle the nonnull attribute on the function/method declaration itself.
      for (const auto *NonNull : FDecl->specific_attrs<NonNullAttr>()) {
        if (!NonNull->args_size()) {
          // Easy case: all pointer arguments are nonnull.
          for (const auto *Arg : Args)
            if (S.isValidPointerAttrType(Arg->getType()))
              CheckNonNullArgument(S, Arg, CallSiteLoc);
          return;
        }
  
        for (const ParamIdx &Idx : NonNull->args()) {
          unsigned IdxAST = Idx.getASTIndex();
          if (IdxAST >= Args.size())
            continue;
          if (NonNullArgs.empty())
            NonNullArgs.resize(Args.size());
          NonNullArgs.set(IdxAST);
        }
      }
    }
  
    if (FDecl && (isa<FunctionDecl>(FDecl) || isa<ObjCMethodDecl>(FDecl))) {
      // Handle the nonnull attribute on the parameters of the
      // function/method.
      ArrayRef<ParmVarDecl*> parms;
      if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(FDecl))
        parms = FD->parameters();
      else
        parms = cast<ObjCMethodDecl>(FDecl)->parameters();
  
      unsigned ParamIndex = 0;
      for (ArrayRef<ParmVarDecl*>::iterator I = parms.begin(), E = parms.end();
           I != E; ++I, ++ParamIndex) {
        const ParmVarDecl *PVD = *I;
        if (PVD->hasAttr<NonNullAttr>() ||
            isNonNullType(S.Context, PVD->getType())) {
          if (NonNullArgs.empty())
            NonNullArgs.resize(Args.size());
  
          NonNullArgs.set(ParamIndex);
        }
      }
    } else {
      // If we have a non-function, non-method declaration but no
      // function prototype, try to dig out the function prototype.
      if (!Proto) {
        if (const ValueDecl *VD = dyn_cast<ValueDecl>(FDecl)) {
          QualType type = VD->getType().getNonReferenceType();
          if (auto pointerType = type->getAs<PointerType>())
            type = pointerType->getPointeeType();
          else if (auto blockType = type->getAs<BlockPointerType>())
            type = blockType->getPointeeType();
          // FIXME: data member pointers?
  
          // Dig out the function prototype, if there is one.
          Proto = type->getAs<FunctionProtoType>();
        }
      }
  
      // Fill in non-null argument information from the nullability
      // information on the parameter types (if we have them).
      if (Proto) {
        unsigned Index = 0;
        for (auto paramType : Proto->getParamTypes()) {
          if (isNonNullType(S.Context, paramType)) {
            if (NonNullArgs.empty())
              NonNullArgs.resize(Args.size());
  
            NonNullArgs.set(Index);
          }
  
          ++Index;
        }
      }
    }
  
    // Check for non-null arguments.
    for (unsigned ArgIndex = 0, ArgIndexEnd = NonNullArgs.size();
         ArgIndex != ArgIndexEnd; ++ArgIndex) {
      if (NonNullArgs[ArgIndex])
        CheckNonNullArgument(S, Args[ArgIndex], CallSiteLoc);
    }
  }
  
  /// Handles the checks for format strings, non-POD arguments to vararg
  /// functions, NULL arguments passed to non-NULL parameters, and diagnose_if
  /// attributes.
  void Sema::checkCall(NamedDecl *FDecl, const FunctionProtoType *Proto,
                       const Expr *ThisArg, ArrayRef<const Expr *> Args,
                       bool IsMemberFunction, SourceLocation Loc,
                       SourceRange Range, VariadicCallType CallType) {
    // FIXME: We should check as much as we can in the template definition.
    if (CurContext->isDependentContext())
      return;
  
    // Printf and scanf checking.
    llvm::SmallBitVector CheckedVarArgs;
    if (FDecl) {
      for (const auto *I : FDecl->specific_attrs<FormatAttr>()) {
        // Only create vector if there are format attributes.
        CheckedVarArgs.resize(Args.size());
  
        CheckFormatArguments(I, Args, IsMemberFunction, CallType, Loc, Range,
                             CheckedVarArgs);
      }
    }
  
    // Refuse POD arguments that weren't caught by the format string
    // checks above.
    auto *FD = dyn_cast_or_null<FunctionDecl>(FDecl);
    if (CallType != VariadicDoesNotApply &&
        (!FD || FD->getBuiltinID() != Builtin::BI__noop)) {
      unsigned NumParams = Proto ? Proto->getNumParams()
                         : FDecl && isa<FunctionDecl>(FDecl)
                             ? cast<FunctionDecl>(FDecl)->getNumParams()
                         : FDecl && isa<ObjCMethodDecl>(FDecl)
                             ? cast<ObjCMethodDecl>(FDecl)->param_size()
                         : 0;
  
      for (unsigned ArgIdx = NumParams; ArgIdx < Args.size(); ++ArgIdx) {
        // Args[ArgIdx] can be null in malformed code.
        if (const Expr *Arg = Args[ArgIdx]) {
          if (CheckedVarArgs.empty() || !CheckedVarArgs[ArgIdx])
            checkVariadicArgument(Arg, CallType);
        }
      }
    }
  
    if (FDecl || Proto) {
      CheckNonNullArguments(*this, FDecl, Proto, Args, Loc);
  
      // Type safety checking.
      if (FDecl) {
        for (const auto *I : FDecl->specific_attrs<ArgumentWithTypeTagAttr>())
          CheckArgumentWithTypeTag(I, Args, Loc);
      }
    }
  
    if (FD)
      diagnoseArgDependentDiagnoseIfAttrs(FD, ThisArg, Args, Loc);
  }
  
  /// CheckConstructorCall - Check a constructor call for correctness and safety
  /// properties not enforced by the C type system.
  void Sema::CheckConstructorCall(FunctionDecl *FDecl,
                                  ArrayRef<const Expr *> Args,
                                  const FunctionProtoType *Proto,
                                  SourceLocation Loc) {
    VariadicCallType CallType =
      Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply;
    checkCall(FDecl, Proto, /*ThisArg=*/nullptr, Args, /*IsMemberFunction=*/true,
              Loc, SourceRange(), CallType);
  }
  
  /// CheckFunctionCall - Check a direct function call for various correctness
  /// and safety properties not strictly enforced by the C type system.
  bool Sema::CheckFunctionCall(FunctionDecl *FDecl, CallExpr *TheCall,
                               const FunctionProtoType *Proto) {
    bool IsMemberOperatorCall = isa<CXXOperatorCallExpr>(TheCall) &&
                                isa<CXXMethodDecl>(FDecl);
    bool IsMemberFunction = isa<CXXMemberCallExpr>(TheCall) ||
                            IsMemberOperatorCall;
    VariadicCallType CallType = getVariadicCallType(FDecl, Proto,
                                                    TheCall->getCallee());
    Expr** Args = TheCall->getArgs();
    unsigned NumArgs = TheCall->getNumArgs();
  
    Expr *ImplicitThis = nullptr;
    if (IsMemberOperatorCall) {
      // If this is a call to a member operator, hide the first argument
      // from checkCall.
      // FIXME: Our choice of AST representation here is less than ideal.
      ImplicitThis = Args[0];
      ++Args;
      --NumArgs;
    } else if (IsMemberFunction)
      ImplicitThis =
          cast<CXXMemberCallExpr>(TheCall)->getImplicitObjectArgument();
  
    checkCall(FDecl, Proto, ImplicitThis, llvm::makeArrayRef(Args, NumArgs),
              IsMemberFunction, TheCall->getRParenLoc(),
              TheCall->getCallee()->getSourceRange(), CallType);
  
    IdentifierInfo *FnInfo = FDecl->getIdentifier();
    // None of the checks below are needed for functions that don't have
    // simple names (e.g., C++ conversion functions).
    if (!FnInfo)
      return false;
  
    CheckAbsoluteValueFunction(TheCall, FDecl);
    CheckMaxUnsignedZero(TheCall, FDecl);
  
    if (getLangOpts().ObjC)
      DiagnoseCStringFormatDirectiveInCFAPI(*this, FDecl, Args, NumArgs);
  
    unsigned CMId = FDecl->getMemoryFunctionKind();
    if (CMId == 0)
      return false;
  
    // Handle memory setting and copying functions.
    if (CMId == Builtin::BIstrlcpy || CMId == Builtin::BIstrlcat)
      CheckStrlcpycatArguments(TheCall, FnInfo);
    else if (CMId == Builtin::BIstrncat)
      CheckStrncatArguments(TheCall, FnInfo);
    else
      CheckMemaccessArguments(TheCall, CMId, FnInfo);
  
    return false;
  }
  
  bool Sema::CheckObjCMethodCall(ObjCMethodDecl *Method, SourceLocation lbrac,
                                 ArrayRef<const Expr *> Args) {
    VariadicCallType CallType =
        Method->isVariadic() ? VariadicMethod : VariadicDoesNotApply;
  
    checkCall(Method, nullptr, /*ThisArg=*/nullptr, Args,
              /*IsMemberFunction=*/false, lbrac, Method->getSourceRange(),
              CallType);
  
    return false;
  }
  
  bool Sema::CheckPointerCall(NamedDecl *NDecl, CallExpr *TheCall,
                              const FunctionProtoType *Proto) {
    QualType Ty;
    if (const auto *V = dyn_cast<VarDecl>(NDecl))
      Ty = V->getType().getNonReferenceType();
    else if (const auto *F = dyn_cast<FieldDecl>(NDecl))
      Ty = F->getType().getNonReferenceType();
    else
      return false;
  
    if (!Ty->isBlockPointerType() && !Ty->isFunctionPointerType() &&
        !Ty->isFunctionProtoType())
      return false;
  
    VariadicCallType CallType;
    if (!Proto || !Proto->isVariadic()) {
      CallType = VariadicDoesNotApply;
    } else if (Ty->isBlockPointerType()) {
      CallType = VariadicBlock;
    } else { // Ty->isFunctionPointerType()
      CallType = VariadicFunction;
    }
  
    checkCall(NDecl, Proto, /*ThisArg=*/nullptr,
              llvm::makeArrayRef(TheCall->getArgs(), TheCall->getNumArgs()),
              /*IsMemberFunction=*/false, TheCall->getRParenLoc(),
              TheCall->getCallee()->getSourceRange(), CallType);
  
    return false;
  }
  
  /// Checks function calls when a FunctionDecl or a NamedDecl is not available,
  /// such as function pointers returned from functions.
  bool Sema::CheckOtherCall(CallExpr *TheCall, const FunctionProtoType *Proto) {
    VariadicCallType CallType = getVariadicCallType(/*FDecl=*/nullptr, Proto,
                                                    TheCall->getCallee());
    checkCall(/*FDecl=*/nullptr, Proto, /*ThisArg=*/nullptr,
              llvm::makeArrayRef(TheCall->getArgs(), TheCall->getNumArgs()),
              /*IsMemberFunction=*/false, TheCall->getRParenLoc(),
              TheCall->getCallee()->getSourceRange(), CallType);
  
    return false;
  }
  
  static bool isValidOrderingForOp(int64_t Ordering, AtomicExpr::AtomicOp Op) {
    if (!llvm::isValidAtomicOrderingCABI(Ordering))
      return false;
  
    auto OrderingCABI = (llvm::AtomicOrderingCABI)Ordering;
    switch (Op) {
    case AtomicExpr::AO__c11_atomic_init:
    case AtomicExpr::AO__opencl_atomic_init:
      llvm_unreachable("There is no ordering argument for an init");
  
    case AtomicExpr::AO__c11_atomic_load:
    case AtomicExpr::AO__opencl_atomic_load:
    case AtomicExpr::AO__atomic_load_n:
    case AtomicExpr::AO__atomic_load:
      return OrderingCABI != llvm::AtomicOrderingCABI::release &&
             OrderingCABI != llvm::AtomicOrderingCABI::acq_rel;
  
    case AtomicExpr::AO__c11_atomic_store:
    case AtomicExpr::AO__opencl_atomic_store:
    case AtomicExpr::AO__atomic_store:
    case AtomicExpr::AO__atomic_store_n:
      return OrderingCABI != llvm::AtomicOrderingCABI::consume &&
             OrderingCABI != llvm::AtomicOrderingCABI::acquire &&
             OrderingCABI != llvm::AtomicOrderingCABI::acq_rel;
  
    default:
      return true;
    }
  }
  
  ExprResult Sema::SemaAtomicOpsOverloaded(ExprResult TheCallResult,
                                           AtomicExpr::AtomicOp Op) {
    CallExpr *TheCall = cast<CallExpr>(TheCallResult.get());
    DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
    MultiExprArg Args{TheCall->getArgs(), TheCall->getNumArgs()};
    return BuildAtomicExpr({TheCall->getBeginLoc(), TheCall->getEndLoc()},
                           DRE->getSourceRange(), TheCall->getRParenLoc(), Args,
                           Op);
  }
  
  ExprResult Sema::BuildAtomicExpr(SourceRange CallRange, SourceRange ExprRange,
                                   SourceLocation RParenLoc, MultiExprArg Args,
                                   AtomicExpr::AtomicOp Op,
                                   AtomicArgumentOrder ArgOrder) {
    // All the non-OpenCL operations take one of the following forms.
    // The OpenCL operations take the __c11 forms with one extra argument for
    // synchronization scope.
    enum {
      // C    __c11_atomic_init(A *, C)
      Init,
  
      // C    __c11_atomic_load(A *, int)
      Load,
  
      // void __atomic_load(A *, CP, int)
      LoadCopy,
  
      // void __atomic_store(A *, CP, int)
      Copy,
  
      // C    __c11_atomic_add(A *, M, int)
      Arithmetic,
  
      // C    __atomic_exchange_n(A *, CP, int)
      Xchg,
  
      // void __atomic_exchange(A *, C *, CP, int)
      GNUXchg,
  
      // bool __c11_atomic_compare_exchange_strong(A *, C *, CP, int, int)
      C11CmpXchg,
  
      // bool __atomic_compare_exchange(A *, C *, CP, bool, int, int)
      GNUCmpXchg
    } Form = Init;
  
    const unsigned NumForm = GNUCmpXchg + 1;
    const unsigned NumArgs[] = { 2, 2, 3, 3, 3, 3, 4, 5, 6 };
    const unsigned NumVals[] = { 1, 0, 1, 1, 1, 1, 2, 2, 3 };
    // where:
    //   C is an appropriate type,
    //   A is volatile _Atomic(C) for __c11 builtins and is C for GNU builtins,
    //   CP is C for __c11 builtins and GNU _n builtins and is C * otherwise,
    //   M is C if C is an integer, and ptrdiff_t if C is a pointer, and
    //   the int parameters are for orderings.
  
    static_assert(sizeof(NumArgs)/sizeof(NumArgs[0]) == NumForm
        && sizeof(NumVals)/sizeof(NumVals[0]) == NumForm,
        "need to update code for modified forms");
    static_assert(AtomicExpr::AO__c11_atomic_init == 0 &&
                      AtomicExpr::AO__c11_atomic_fetch_min + 1 ==
                          AtomicExpr::AO__atomic_load,
                  "need to update code for modified C11 atomics");
    bool IsOpenCL = Op >= AtomicExpr::AO__opencl_atomic_init &&
                    Op <= AtomicExpr::AO__opencl_atomic_fetch_max;
    bool IsC11 = (Op >= AtomicExpr::AO__c11_atomic_init &&
                 Op <= AtomicExpr::AO__c11_atomic_fetch_min) ||
                 IsOpenCL;
    bool IsN = Op == AtomicExpr::AO__atomic_load_n ||
               Op == AtomicExpr::AO__atomic_store_n ||
               Op == AtomicExpr::AO__atomic_exchange_n ||
               Op == AtomicExpr::AO__atomic_compare_exchange_n;
    bool IsAddSub = false;
  
    switch (Op) {
    case AtomicExpr::AO__c11_atomic_init:
    case AtomicExpr::AO__opencl_atomic_init:
      Form = Init;
      break;
  
    case AtomicExpr::AO__c11_atomic_load:
    case AtomicExpr::AO__opencl_atomic_load:
    case AtomicExpr::AO__atomic_load_n:
      Form = Load;
      break;
  
    case AtomicExpr::AO__atomic_load:
      Form = LoadCopy;
      break;
  
    case AtomicExpr::AO__c11_atomic_store:
    case AtomicExpr::AO__opencl_atomic_store:
    case AtomicExpr::AO__atomic_store:
    case AtomicExpr::AO__atomic_store_n:
      Form = Copy;
      break;
  
    case AtomicExpr::AO__c11_atomic_fetch_add:
    case AtomicExpr::AO__c11_atomic_fetch_sub:
    case AtomicExpr::AO__opencl_atomic_fetch_add:
    case AtomicExpr::AO__opencl_atomic_fetch_sub:
    case AtomicExpr::AO__atomic_fetch_add:
    case AtomicExpr::AO__atomic_fetch_sub:
    case AtomicExpr::AO__atomic_add_fetch:
    case AtomicExpr::AO__atomic_sub_fetch:
      IsAddSub = true;
      LLVM_FALLTHROUGH;
    case AtomicExpr::AO__c11_atomic_fetch_and:
    case AtomicExpr::AO__c11_atomic_fetch_or:
    case AtomicExpr::AO__c11_atomic_fetch_xor:
    case AtomicExpr::AO__opencl_atomic_fetch_and:
    case AtomicExpr::AO__opencl_atomic_fetch_or:
    case AtomicExpr::AO__opencl_atomic_fetch_xor:
    case AtomicExpr::AO__atomic_fetch_and:
    case AtomicExpr::AO__atomic_fetch_or:
    case AtomicExpr::AO__atomic_fetch_xor:
    case AtomicExpr::AO__atomic_fetch_nand:
    case AtomicExpr::AO__atomic_and_fetch:
    case AtomicExpr::AO__atomic_or_fetch:
    case AtomicExpr::AO__atomic_xor_fetch:
    case AtomicExpr::AO__atomic_nand_fetch:
    case AtomicExpr::AO__c11_atomic_fetch_min:
    case AtomicExpr::AO__c11_atomic_fetch_max:
    case AtomicExpr::AO__opencl_atomic_fetch_min:
    case AtomicExpr::AO__opencl_atomic_fetch_max:
    case AtomicExpr::AO__atomic_min_fetch:
    case AtomicExpr::AO__atomic_max_fetch:
    case AtomicExpr::AO__atomic_fetch_min:
    case AtomicExpr::AO__atomic_fetch_max:
      Form = Arithmetic;
      break;
  
    case AtomicExpr::AO__c11_atomic_exchange:
    case AtomicExpr::AO__opencl_atomic_exchange:
    case AtomicExpr::AO__atomic_exchange_n:
      Form = Xchg;
      break;
  
    case AtomicExpr::AO__atomic_exchange:
      Form = GNUXchg;
      break;
  
    case AtomicExpr::AO__c11_atomic_compare_exchange_strong:
    case AtomicExpr::AO__c11_atomic_compare_exchange_weak:
    case AtomicExpr::AO__opencl_atomic_compare_exchange_strong:
    case AtomicExpr::AO__opencl_atomic_compare_exchange_weak:
      Form = C11CmpXchg;
      break;
  
    case AtomicExpr::AO__atomic_compare_exchange:
    case AtomicExpr::AO__atomic_compare_exchange_n:
      Form = GNUCmpXchg;
      break;
    }
  
    unsigned AdjustedNumArgs = NumArgs[Form];
    if (IsOpenCL && Op != AtomicExpr::AO__opencl_atomic_init)
      ++AdjustedNumArgs;
    // Check we have the right number of arguments.
    if (Args.size() < AdjustedNumArgs) {
      Diag(CallRange.getEnd(), diag::err_typecheck_call_too_few_args)
          << 0 << AdjustedNumArgs << static_cast<unsigned>(Args.size())
          << ExprRange;
      return ExprError();
    } else if (Args.size() > AdjustedNumArgs) {
      Diag(Args[AdjustedNumArgs]->getBeginLoc(),
           diag::err_typecheck_call_too_many_args)
          << 0 << AdjustedNumArgs << static_cast<unsigned>(Args.size())
          << ExprRange;
      return ExprError();
    }
  
    // Inspect the first argument of the atomic operation.
    Expr *Ptr = Args[0];
    ExprResult ConvertedPtr = DefaultFunctionArrayLvalueConversion(Ptr);
    if (ConvertedPtr.isInvalid())
      return ExprError();
  
    Ptr = ConvertedPtr.get();
    const PointerType *pointerType = Ptr->getType()->getAs<PointerType>();
    if (!pointerType) {
      Diag(ExprRange.getBegin(), diag::err_atomic_builtin_must_be_pointer)
          << Ptr->getType() << Ptr->getSourceRange();
      return ExprError();
    }
  
    // For a __c11 builtin, this should be a pointer to an _Atomic type.
    QualType AtomTy = pointerType->getPointeeType(); // 'A'
    QualType ValType = AtomTy; // 'C'
    if (IsC11) {
      if (!AtomTy->isAtomicType()) {
        Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_atomic)
            << Ptr->getType() << Ptr->getSourceRange();
        return ExprError();
      }
      if ((Form != Load && Form != LoadCopy && AtomTy.isConstQualified()) ||
          AtomTy.getAddressSpace() == LangAS::opencl_constant) {
        Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_non_const_atomic)
            << (AtomTy.isConstQualified() ? 0 : 1) << Ptr->getType()
            << Ptr->getSourceRange();
        return ExprError();
      }
      ValType = AtomTy->castAs<AtomicType>()->getValueType();
    } else if (Form != Load && Form != LoadCopy) {
      if (ValType.isConstQualified()) {
        Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_non_const_pointer)
            << Ptr->getType() << Ptr->getSourceRange();
        return ExprError();
      }
    }
  
    // For an arithmetic operation, the implied arithmetic must be well-formed.
    if (Form == Arithmetic) {
      // gcc does not enforce these rules for GNU atomics, but we do so for sanity.
      if (IsAddSub && !ValType->isIntegerType()
          && !ValType->isPointerType()) {
        Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_atomic_int_or_ptr)
            << IsC11 << Ptr->getType() << Ptr->getSourceRange();
        return ExprError();
      }
      if (!IsAddSub && !ValType->isIntegerType()) {
        Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_atomic_int)
            << IsC11 << Ptr->getType() << Ptr->getSourceRange();
        return ExprError();
      }
      if (IsC11 && ValType->isPointerType() &&
          RequireCompleteType(Ptr->getBeginLoc(), ValType->getPointeeType(),
                              diag::err_incomplete_type)) {
        return ExprError();
      }
    } else if (IsN && !ValType->isIntegerType() && !ValType->isPointerType()) {
      // For __atomic_*_n operations, the value type must be a scalar integral or
      // pointer type which is 1, 2, 4, 8 or 16 bytes in length.
      Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_atomic_int_or_ptr)
          << IsC11 << Ptr->getType() << Ptr->getSourceRange();
      return ExprError();
    }
  
    if (!IsC11 && !AtomTy.isTriviallyCopyableType(Context) &&
        !AtomTy->isScalarType()) {
      // For GNU atomics, require a trivially-copyable type. This is not part of
      // the GNU atomics specification, but we enforce it for sanity.
      Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_trivial_copy)
          << Ptr->getType() << Ptr->getSourceRange();
      return ExprError();
    }
  
    switch (ValType.getObjCLifetime()) {
    case Qualifiers::OCL_None:
    case Qualifiers::OCL_ExplicitNone:
      // okay
      break;
  
    case Qualifiers::OCL_Weak:
    case Qualifiers::OCL_Strong:
    case Qualifiers::OCL_Autoreleasing:
      // FIXME: Can this happen? By this point, ValType should be known
      // to be trivially copyable.
      Diag(ExprRange.getBegin(), diag::err_arc_atomic_ownership)
          << ValType << Ptr->getSourceRange();
      return ExprError();
    }
  
    // All atomic operations have an overload which takes a pointer to a volatile
    // 'A'.  We shouldn't let the volatile-ness of the pointee-type inject itself
    // into the result or the other operands. Similarly atomic_load takes a
    // pointer to a const 'A'.
    ValType.removeLocalVolatile();
    ValType.removeLocalConst();
    QualType ResultType = ValType;
    if (Form == Copy || Form == LoadCopy || Form == GNUXchg ||
        Form == Init)
      ResultType = Context.VoidTy;
    else if (Form == C11CmpXchg || Form == GNUCmpXchg)
      ResultType = Context.BoolTy;
  
    // The type of a parameter passed 'by value'. In the GNU atomics, such
    // arguments are actually passed as pointers.
    QualType ByValType = ValType; // 'CP'
    bool IsPassedByAddress = false;
    if (!IsC11 && !IsN) {
      ByValType = Ptr->getType();
      IsPassedByAddress = true;
    }
  
    SmallVector<Expr *, 5> APIOrderedArgs;
    if (ArgOrder == Sema::AtomicArgumentOrder::AST) {
      APIOrderedArgs.push_back(Args[0]);
      switch (Form) {
      case Init:
      case Load:
        APIOrderedArgs.push_back(Args[1]); // Val1/Order
        break;
      case LoadCopy:
      case Copy:
      case Arithmetic:
      case Xchg:
        APIOrderedArgs.push_back(Args[2]); // Val1
        APIOrderedArgs.push_back(Args[1]); // Order
        break;
      case GNUXchg:
        APIOrderedArgs.push_back(Args[2]); // Val1
        APIOrderedArgs.push_back(Args[3]); // Val2
        APIOrderedArgs.push_back(Args[1]); // Order
        break;
      case C11CmpXchg:
        APIOrderedArgs.push_back(Args[2]); // Val1
        APIOrderedArgs.push_back(Args[4]); // Val2
        APIOrderedArgs.push_back(Args[1]); // Order
        APIOrderedArgs.push_back(Args[3]); // OrderFail
        break;
      case GNUCmpXchg:
        APIOrderedArgs.push_back(Args[2]); // Val1
        APIOrderedArgs.push_back(Args[4]); // Val2
        APIOrderedArgs.push_back(Args[5]); // Weak
        APIOrderedArgs.push_back(Args[1]); // Order
        APIOrderedArgs.push_back(Args[3]); // OrderFail
        break;
      }
    } else
      APIOrderedArgs.append(Args.begin(), Args.end());
  
    // The first argument's non-CV pointer type is used to deduce the type of
    // subsequent arguments, except for:
    //  - weak flag (always converted to bool)
    //  - memory order (always converted to int)
    //  - scope  (always converted to int)
    for (unsigned i = 0; i != APIOrderedArgs.size(); ++i) {
      QualType Ty;
      if (i < NumVals[Form] + 1) {
        switch (i) {
        case 0:
          // The first argument is always a pointer. It has a fixed type.
          // It is always dereferenced, a nullptr is undefined.
          CheckNonNullArgument(*this, APIOrderedArgs[i], ExprRange.getBegin());
          // Nothing else to do: we already know all we want about this pointer.
          continue;
        case 1:
          // The second argument is the non-atomic operand. For arithmetic, this
          // is always passed by value, and for a compare_exchange it is always
          // passed by address. For the rest, GNU uses by-address and C11 uses
          // by-value.
          assert(Form != Load);
          if (Form == Init || (Form == Arithmetic && ValType->isIntegerType()))
            Ty = ValType;
          else if (Form == Copy || Form == Xchg) {
            if (IsPassedByAddress) {
              // The value pointer is always dereferenced, a nullptr is undefined.
              CheckNonNullArgument(*this, APIOrderedArgs[i],
                                   ExprRange.getBegin());
            }
            Ty = ByValType;
          } else if (Form == Arithmetic)
            Ty = Context.getPointerDiffType();
          else {
            Expr *ValArg = APIOrderedArgs[i];
            // The value pointer is always dereferenced, a nullptr is undefined.
            CheckNonNullArgument(*this, ValArg, ExprRange.getBegin());
            LangAS AS = LangAS::Default;
            // Keep address space of non-atomic pointer type.
            if (const PointerType *PtrTy =
                    ValArg->getType()->getAs<PointerType>()) {
              AS = PtrTy->getPointeeType().getAddressSpace();
            }
            Ty = Context.getPointerType(
                Context.getAddrSpaceQualType(ValType.getUnqualifiedType(), AS));
          }
          break;
        case 2:
          // The third argument to compare_exchange / GNU exchange is the desired
          // value, either by-value (for the C11 and *_n variant) or as a pointer.
          if (IsPassedByAddress)
            CheckNonNullArgument(*this, APIOrderedArgs[i], ExprRange.getBegin());
          Ty = ByValType;
          break;
        case 3:
          // The fourth argument to GNU compare_exchange is a 'weak' flag.
          Ty = Context.BoolTy;
          break;
        }
      } else {
        // The order(s) and scope are always converted to int.
        Ty = Context.IntTy;
      }
  
      InitializedEntity Entity =
          InitializedEntity::InitializeParameter(Context, Ty, false);
      ExprResult Arg = APIOrderedArgs[i];
      Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
      if (Arg.isInvalid())
        return true;
      APIOrderedArgs[i] = Arg.get();
    }
  
    // Permute the arguments into a 'consistent' order.
    SmallVector<Expr*, 5> SubExprs;
    SubExprs.push_back(Ptr);
    switch (Form) {
    case Init:
      // Note, AtomicExpr::getVal1() has a special case for this atomic.
      SubExprs.push_back(APIOrderedArgs[1]); // Val1
      break;
    case Load:
      SubExprs.push_back(APIOrderedArgs[1]); // Order
      break;
    case LoadCopy:
    case Copy:
    case Arithmetic:
    case Xchg:
      SubExprs.push_back(APIOrderedArgs[2]); // Order
      SubExprs.push_back(APIOrderedArgs[1]); // Val1
      break;
    case GNUXchg:
      // Note, AtomicExpr::getVal2() has a special case for this atomic.
      SubExprs.push_back(APIOrderedArgs[3]); // Order
      SubExprs.push_back(APIOrderedArgs[1]); // Val1
      SubExprs.push_back(APIOrderedArgs[2]); // Val2
      break;
    case C11CmpXchg:
      SubExprs.push_back(APIOrderedArgs[3]); // Order
      SubExprs.push_back(APIOrderedArgs[1]); // Val1
      SubExprs.push_back(APIOrderedArgs[4]); // OrderFail
      SubExprs.push_back(APIOrderedArgs[2]); // Val2
      break;
    case GNUCmpXchg:
      SubExprs.push_back(APIOrderedArgs[4]); // Order
      SubExprs.push_back(APIOrderedArgs[1]); // Val1
      SubExprs.push_back(APIOrderedArgs[5]); // OrderFail
      SubExprs.push_back(APIOrderedArgs[2]); // Val2
      SubExprs.push_back(APIOrderedArgs[3]); // Weak
      break;
    }
  
    if (SubExprs.size() >= 2 && Form != Init) {
      llvm::APSInt Result(32);
      if (SubExprs[1]->isIntegerConstantExpr(Result, Context) &&
          !isValidOrderingForOp(Result.getSExtValue(), Op))
        Diag(SubExprs[1]->getBeginLoc(),
             diag::warn_atomic_op_has_invalid_memory_order)
            << SubExprs[1]->getSourceRange();
    }
  
    if (auto ScopeModel = AtomicExpr::getScopeModel(Op)) {
      auto *Scope = Args[Args.size() - 1];
      llvm::APSInt Result(32);
      if (Scope->isIntegerConstantExpr(Result, Context) &&
          !ScopeModel->isValid(Result.getZExtValue())) {
        Diag(Scope->getBeginLoc(), diag::err_atomic_op_has_invalid_synch_scope)
            << Scope->getSourceRange();
      }
      SubExprs.push_back(Scope);
    }
  
    AtomicExpr *AE = new (Context)
        AtomicExpr(ExprRange.getBegin(), SubExprs, ResultType, Op, RParenLoc);
  
    if ((Op == AtomicExpr::AO__c11_atomic_load ||
         Op == AtomicExpr::AO__c11_atomic_store ||
         Op == AtomicExpr::AO__opencl_atomic_load ||
         Op == AtomicExpr::AO__opencl_atomic_store ) &&
        Context.AtomicUsesUnsupportedLibcall(AE))
      Diag(AE->getBeginLoc(), diag::err_atomic_load_store_uses_lib)
          << ((Op == AtomicExpr::AO__c11_atomic_load ||
               Op == AtomicExpr::AO__opencl_atomic_load)
                  ? 0
                  : 1);
  
    return AE;
  }
  
  /// checkBuiltinArgument - Given a call to a builtin function, perform
  /// normal type-checking on the given argument, updating the call in
  /// place.  This is useful when a builtin function requires custom
  /// type-checking for some of its arguments but not necessarily all of
  /// them.
  ///
  /// Returns true on error.
  static bool checkBuiltinArgument(Sema &S, CallExpr *E, unsigned ArgIndex) {
    FunctionDecl *Fn = E->getDirectCallee();
    assert(Fn && "builtin call without direct callee!");
  
    ParmVarDecl *Param = Fn->getParamDecl(ArgIndex);
    InitializedEntity Entity =
      InitializedEntity::InitializeParameter(S.Context, Param);
  
    ExprResult Arg = E->getArg(0);
    Arg = S.PerformCopyInitialization(Entity, SourceLocation(), Arg);
    if (Arg.isInvalid())
      return true;
  
    E->setArg(ArgIndex, Arg.get());
    return false;
  }
  
  /// We have a call to a function like __sync_fetch_and_add, which is an
  /// overloaded function based on the pointer type of its first argument.
  /// The main BuildCallExpr routines have already promoted the types of
  /// arguments because all of these calls are prototyped as void(...).
  ///
  /// This function goes through and does final semantic checking for these
  /// builtins, as well as generating any warnings.
  ExprResult
  Sema::SemaBuiltinAtomicOverloaded(ExprResult TheCallResult) {
    CallExpr *TheCall = static_cast<CallExpr *>(TheCallResult.get());
    Expr *Callee = TheCall->getCallee();
    DeclRefExpr *DRE = cast<DeclRefExpr>(Callee->IgnoreParenCasts());
    FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl());
  
    // Ensure that we have at least one argument to do type inference from.
    if (TheCall->getNumArgs() < 1) {
      Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args_at_least)
          << 0 << 1 << TheCall->getNumArgs() << Callee->getSourceRange();
      return ExprError();
    }
  
    // Inspect the first argument of the atomic builtin.  This should always be
    // a pointer type, whose element is an integral scalar or pointer type.
    // Because it is a pointer type, we don't have to worry about any implicit
    // casts here.
    // FIXME: We don't allow floating point scalars as input.
    Expr *FirstArg = TheCall->getArg(0);
    ExprResult FirstArgResult = DefaultFunctionArrayLvalueConversion(FirstArg);
    if (FirstArgResult.isInvalid())
      return ExprError();
    FirstArg = FirstArgResult.get();
    TheCall->setArg(0, FirstArg);
  
    const PointerType *pointerType = FirstArg->getType()->getAs<PointerType>();
    if (!pointerType) {
      Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer)
          << FirstArg->getType() << FirstArg->getSourceRange();
      return ExprError();
    }
  
    QualType ValType = pointerType->getPointeeType();
    if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
        !ValType->isBlockPointerType()) {
      Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer_intptr)
          << FirstArg->getType() << FirstArg->getSourceRange();
      return ExprError();
    }
  
    if (ValType.isConstQualified()) {
      Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_cannot_be_const)
          << FirstArg->getType() << FirstArg->getSourceRange();
      return ExprError();
    }
  
    switch (ValType.getObjCLifetime()) {
    case Qualifiers::OCL_None:
    case Qualifiers::OCL_ExplicitNone:
      // okay
      break;
  
    case Qualifiers::OCL_Weak:
    case Qualifiers::OCL_Strong:
    case Qualifiers::OCL_Autoreleasing:
      Diag(DRE->getBeginLoc(), diag::err_arc_atomic_ownership)
          << ValType << FirstArg->getSourceRange();
      return ExprError();
    }
  
    // Strip any qualifiers off ValType.
    ValType = ValType.getUnqualifiedType();
  
    // The majority of builtins return a value, but a few have special return
    // types, so allow them to override appropriately below.
    QualType ResultType = ValType;
  
    // We need to figure out which concrete builtin this maps onto.  For example,
    // __sync_fetch_and_add with a 2 byte object turns into
    // __sync_fetch_and_add_2.
  #define BUILTIN_ROW(x) \
    { Builtin::BI##x##_1, Builtin::BI##x##_2, Builtin::BI##x##_4, \
      Builtin::BI##x##_8, Builtin::BI##x##_16 }
  
    static const unsigned BuiltinIndices[][5] = {
      BUILTIN_ROW(__sync_fetch_and_add),
      BUILTIN_ROW(__sync_fetch_and_sub),
      BUILTIN_ROW(__sync_fetch_and_or),
      BUILTIN_ROW(__sync_fetch_and_and),
      BUILTIN_ROW(__sync_fetch_and_xor),
      BUILTIN_ROW(__sync_fetch_and_nand),
  
      BUILTIN_ROW(__sync_add_and_fetch),
      BUILTIN_ROW(__sync_sub_and_fetch),
      BUILTIN_ROW(__sync_and_and_fetch),
      BUILTIN_ROW(__sync_or_and_fetch),
      BUILTIN_ROW(__sync_xor_and_fetch),
      BUILTIN_ROW(__sync_nand_and_fetch),
  
      BUILTIN_ROW(__sync_val_compare_and_swap),
      BUILTIN_ROW(__sync_bool_compare_and_swap),
      BUILTIN_ROW(__sync_lock_test_and_set),
      BUILTIN_ROW(__sync_lock_release),
      BUILTIN_ROW(__sync_swap)
    };
  #undef BUILTIN_ROW
  
    // Determine the index of the size.
    unsigned SizeIndex;
    switch (Context.getTypeSizeInChars(ValType).getQuantity()) {
    case 1: SizeIndex = 0; break;
    case 2: SizeIndex = 1; break;
    case 4: SizeIndex = 2; break;
    case 8: SizeIndex = 3; break;
    case 16: SizeIndex = 4; break;
    default:
      Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_pointer_size)
          << FirstArg->getType() << FirstArg->getSourceRange();
      return ExprError();
    }
  
    // Each of these builtins has one pointer argument, followed by some number of
    // values (0, 1 or 2) followed by a potentially empty varags list of stuff
    // that we ignore.  Find out which row of BuiltinIndices to read from as well
    // as the number of fixed args.
    unsigned BuiltinID = FDecl->getBuiltinID();
    unsigned BuiltinIndex, NumFixed = 1;
    bool WarnAboutSemanticsChange = false;
    switch (BuiltinID) {
    default: llvm_unreachable("Unknown overloaded atomic builtin!");
    case Builtin::BI__sync_fetch_and_add:
    case Builtin::BI__sync_fetch_and_add_1:
    case Builtin::BI__sync_fetch_and_add_2:
    case Builtin::BI__sync_fetch_and_add_4:
    case Builtin::BI__sync_fetch_and_add_8:
    case Builtin::BI__sync_fetch_and_add_16:
      BuiltinIndex = 0;
      break;
  
    case Builtin::BI__sync_fetch_and_sub:
    case Builtin::BI__sync_fetch_and_sub_1:
    case Builtin::BI__sync_fetch_and_sub_2:
    case Builtin::BI__sync_fetch_and_sub_4:
    case Builtin::BI__sync_fetch_and_sub_8:
    case Builtin::BI__sync_fetch_and_sub_16:
      BuiltinIndex = 1;
      break;
  
    case Builtin::BI__sync_fetch_and_or:
    case Builtin::BI__sync_fetch_and_or_1:
    case Builtin::BI__sync_fetch_and_or_2:
    case Builtin::BI__sync_fetch_and_or_4:
    case Builtin::BI__sync_fetch_and_or_8:
    case Builtin::BI__sync_fetch_and_or_16:
      BuiltinIndex = 2;
      break;
  
    case Builtin::BI__sync_fetch_and_and:
    case Builtin::BI__sync_fetch_and_and_1:
    case Builtin::BI__sync_fetch_and_and_2:
    case Builtin::BI__sync_fetch_and_and_4:
    case Builtin::BI__sync_fetch_and_and_8:
    case Builtin::BI__sync_fetch_and_and_16:
      BuiltinIndex = 3;
      break;
  
    case Builtin::BI__sync_fetch_and_xor:
    case Builtin::BI__sync_fetch_and_xor_1:
    case Builtin::BI__sync_fetch_and_xor_2:
    case Builtin::BI__sync_fetch_and_xor_4:
    case Builtin::BI__sync_fetch_and_xor_8:
    case Builtin::BI__sync_fetch_and_xor_16:
      BuiltinIndex = 4;
      break;
  
    case Builtin::BI__sync_fetch_and_nand:
    case Builtin::BI__sync_fetch_and_nand_1:
    case Builtin::BI__sync_fetch_and_nand_2:
    case Builtin::BI__sync_fetch_and_nand_4:
    case Builtin::BI__sync_fetch_and_nand_8:
    case Builtin::BI__sync_fetch_and_nand_16:
      BuiltinIndex = 5;
      WarnAboutSemanticsChange = true;
      break;
  
    case Builtin::BI__sync_add_and_fetch:
    case Builtin::BI__sync_add_and_fetch_1:
    case Builtin::BI__sync_add_and_fetch_2:
    case Builtin::BI__sync_add_and_fetch_4:
    case Builtin::BI__sync_add_and_fetch_8:
    case Builtin::BI__sync_add_and_fetch_16:
      BuiltinIndex = 6;
      break;
  
    case Builtin::BI__sync_sub_and_fetch:
    case Builtin::BI__sync_sub_and_fetch_1:
    case Builtin::BI__sync_sub_and_fetch_2:
    case Builtin::BI__sync_sub_and_fetch_4:
    case Builtin::BI__sync_sub_and_fetch_8:
    case Builtin::BI__sync_sub_and_fetch_16:
      BuiltinIndex = 7;
      break;
  
    case Builtin::BI__sync_and_and_fetch:
    case Builtin::BI__sync_and_and_fetch_1:
    case Builtin::BI__sync_and_and_fetch_2:
    case Builtin::BI__sync_and_and_fetch_4:
    case Builtin::BI__sync_and_and_fetch_8:
    case Builtin::BI__sync_and_and_fetch_16:
      BuiltinIndex = 8;
      break;
  
    case Builtin::BI__sync_or_and_fetch:
    case Builtin::BI__sync_or_and_fetch_1:
    case Builtin::BI__sync_or_and_fetch_2:
    case Builtin::BI__sync_or_and_fetch_4:
    case Builtin::BI__sync_or_and_fetch_8:
    case Builtin::BI__sync_or_and_fetch_16:
      BuiltinIndex = 9;
      break;
  
    case Builtin::BI__sync_xor_and_fetch:
    case Builtin::BI__sync_xor_and_fetch_1:
    case Builtin::BI__sync_xor_and_fetch_2:
    case Builtin::BI__sync_xor_and_fetch_4:
    case Builtin::BI__sync_xor_and_fetch_8:
    case Builtin::BI__sync_xor_and_fetch_16:
      BuiltinIndex = 10;
      break;
  
    case Builtin::BI__sync_nand_and_fetch:
    case Builtin::BI__sync_nand_and_fetch_1:
    case Builtin::BI__sync_nand_and_fetch_2:
    case Builtin::BI__sync_nand_and_fetch_4:
    case Builtin::BI__sync_nand_and_fetch_8:
    case Builtin::BI__sync_nand_and_fetch_16:
      BuiltinIndex = 11;
      WarnAboutSemanticsChange = true;
      break;
  
    case Builtin::BI__sync_val_compare_and_swap:
    case Builtin::BI__sync_val_compare_and_swap_1:
    case Builtin::BI__sync_val_compare_and_swap_2:
    case Builtin::BI__sync_val_compare_and_swap_4:
    case Builtin::BI__sync_val_compare_and_swap_8:
    case Builtin::BI__sync_val_compare_and_swap_16:
      BuiltinIndex = 12;
      NumFixed = 2;
      break;
  
    case Builtin::BI__sync_bool_compare_and_swap:
    case Builtin::BI__sync_bool_compare_and_swap_1:
    case Builtin::BI__sync_bool_compare_and_swap_2:
    case Builtin::BI__sync_bool_compare_and_swap_4:
    case Builtin::BI__sync_bool_compare_and_swap_8:
    case Builtin::BI__sync_bool_compare_and_swap_16:
      BuiltinIndex = 13;
      NumFixed = 2;
      ResultType = Context.BoolTy;
      break;
  
    case Builtin::BI__sync_lock_test_and_set:
    case Builtin::BI__sync_lock_test_and_set_1:
    case Builtin::BI__sync_lock_test_and_set_2:
    case Builtin::BI__sync_lock_test_and_set_4:
    case Builtin::BI__sync_lock_test_and_set_8:
    case Builtin::BI__sync_lock_test_and_set_16:
      BuiltinIndex = 14;
      break;
  
    case Builtin::BI__sync_lock_release:
    case Builtin::BI__sync_lock_release_1:
    case Builtin::BI__sync_lock_release_2:
    case Builtin::BI__sync_lock_release_4:
    case Builtin::BI__sync_lock_release_8:
    case Builtin::BI__sync_lock_release_16:
      BuiltinIndex = 15;
      NumFixed = 0;
      ResultType = Context.VoidTy;
      break;
  
    case Builtin::BI__sync_swap:
    case Builtin::BI__sync_swap_1:
    case Builtin::BI__sync_swap_2:
    case Builtin::BI__sync_swap_4:
    case Builtin::BI__sync_swap_8:
    case Builtin::BI__sync_swap_16:
      BuiltinIndex = 16;
      break;
    }
  
    // Now that we know how many fixed arguments we expect, first check that we
    // have at least that many.
    if (TheCall->getNumArgs() < 1+NumFixed) {
      Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args_at_least)
          << 0 << 1 + NumFixed << TheCall->getNumArgs()
          << Callee->getSourceRange();
      return ExprError();
    }
  
    Diag(TheCall->getEndLoc(), diag::warn_atomic_implicit_seq_cst)
        << Callee->getSourceRange();
  
    if (WarnAboutSemanticsChange) {
      Diag(TheCall->getEndLoc(), diag::warn_sync_fetch_and_nand_semantics_change)
          << Callee->getSourceRange();
    }
  
    // Get the decl for the concrete builtin from this, we can tell what the
    // concrete integer type we should convert to is.
    unsigned NewBuiltinID = BuiltinIndices[BuiltinIndex][SizeIndex];
    const char *NewBuiltinName = Context.BuiltinInfo.getName(NewBuiltinID);
    FunctionDecl *NewBuiltinDecl;
    if (NewBuiltinID == BuiltinID)
      NewBuiltinDecl = FDecl;
    else {
      // Perform builtin lookup to avoid redeclaring it.
      DeclarationName DN(&Context.Idents.get(NewBuiltinName));
      LookupResult Res(*this, DN, DRE->getBeginLoc(), LookupOrdinaryName);
      LookupName(Res, TUScope, /*AllowBuiltinCreation=*/true);
      assert(Res.getFoundDecl());
      NewBuiltinDecl = dyn_cast<FunctionDecl>(Res.getFoundDecl());
      if (!NewBuiltinDecl)
        return ExprError();
    }
  
    // The first argument --- the pointer --- has a fixed type; we
    // deduce the types of the rest of the arguments accordingly.  Walk
    // the remaining arguments, converting them to the deduced value type.
    for (unsigned i = 0; i != NumFixed; ++i) {
      ExprResult Arg = TheCall->getArg(i+1);
  
      // GCC does an implicit conversion to the pointer or integer ValType.  This
      // can fail in some cases (1i -> int**), check for this error case now.
      // Initialize the argument.
      InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
                                                     ValType, /*consume*/ false);
      Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
      if (Arg.isInvalid())
        return ExprError();
  
      // Okay, we have something that *can* be converted to the right type.  Check
      // to see if there is a potentially weird extension going on here.  This can
      // happen when you do an atomic operation on something like an char* and
      // pass in 42.  The 42 gets converted to char.  This is even more strange
      // for things like 45.123 -> char, etc.
      // FIXME: Do this check.
      TheCall->setArg(i+1, Arg.get());
    }
  
    // Create a new DeclRefExpr to refer to the new decl.
    DeclRefExpr *NewDRE = DeclRefExpr::Create(
        Context, DRE->getQualifierLoc(), SourceLocation(), NewBuiltinDecl,
        /*enclosing*/ false, DRE->getLocation(), Context.BuiltinFnTy,
        DRE->getValueKind(), nullptr, nullptr, DRE->isNonOdrUse());
  
    // Set the callee in the CallExpr.
    // FIXME: This loses syntactic information.
    QualType CalleePtrTy = Context.getPointerType(NewBuiltinDecl->getType());
    ExprResult PromotedCall = ImpCastExprToType(NewDRE, CalleePtrTy,
                                                CK_BuiltinFnToFnPtr);
    TheCall->setCallee(PromotedCall.get());
  
    // Change the result type of the call to match the original value type. This
    // is arbitrary, but the codegen for these builtins ins design to handle it
    // gracefully.
    TheCall->setType(ResultType);
  
    return TheCallResult;
  }
  
  /// SemaBuiltinNontemporalOverloaded - We have a call to
  /// __builtin_nontemporal_store or __builtin_nontemporal_load, which is an
  /// overloaded function based on the pointer type of its last argument.
  ///
  /// This function goes through and does final semantic checking for these
  /// builtins.
  ExprResult Sema::SemaBuiltinNontemporalOverloaded(ExprResult TheCallResult) {
    CallExpr *TheCall = (CallExpr *)TheCallResult.get();
    DeclRefExpr *DRE =
        cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
    FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl());
    unsigned BuiltinID = FDecl->getBuiltinID();
    assert((BuiltinID == Builtin::BI__builtin_nontemporal_store ||
            BuiltinID == Builtin::BI__builtin_nontemporal_load) &&
           "Unexpected nontemporal load/store builtin!");
    bool isStore = BuiltinID == Builtin::BI__builtin_nontemporal_store;
    unsigned numArgs = isStore ? 2 : 1;
  
    // Ensure that we have the proper number of arguments.
    if (checkArgCount(*this, TheCall, numArgs))
      return ExprError();
  
    // Inspect the last argument of the nontemporal builtin.  This should always
    // be a pointer type, from which we imply the type of the memory access.
    // Because it is a pointer type, we don't have to worry about any implicit
    // casts here.
    Expr *PointerArg = TheCall->getArg(numArgs - 1);
    ExprResult PointerArgResult =
        DefaultFunctionArrayLvalueConversion(PointerArg);
  
    if (PointerArgResult.isInvalid())
      return ExprError();
    PointerArg = PointerArgResult.get();
    TheCall->setArg(numArgs - 1, PointerArg);
  
    const PointerType *pointerType = PointerArg->getType()->getAs<PointerType>();
    if (!pointerType) {
      Diag(DRE->getBeginLoc(), diag::err_nontemporal_builtin_must_be_pointer)
          << PointerArg->getType() << PointerArg->getSourceRange();
      return ExprError();
    }
  
    QualType ValType = pointerType->getPointeeType();
  
    // Strip any qualifiers off ValType.
    ValType = ValType.getUnqualifiedType();
    if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
        !ValType->isBlockPointerType() && !ValType->isFloatingType() &&
        !ValType->isVectorType()) {
      Diag(DRE->getBeginLoc(),
           diag::err_nontemporal_builtin_must_be_pointer_intfltptr_or_vector)
          << PointerArg->getType() << PointerArg->getSourceRange();
      return ExprError();
    }
  
    if (!isStore) {
      TheCall->setType(ValType);
      return TheCallResult;
    }
  
    ExprResult ValArg = TheCall->getArg(0);
    InitializedEntity Entity = InitializedEntity::InitializeParameter(
        Context, ValType, /*consume*/ false);
    ValArg = PerformCopyInitialization(Entity, SourceLocation(), ValArg);
    if (ValArg.isInvalid())
      return ExprError();
  
    TheCall->setArg(0, ValArg.get());
    TheCall->setType(Context.VoidTy);
    return TheCallResult;
  }
  
  /// CheckObjCString - Checks that the argument to the builtin
  /// CFString constructor is correct
  /// Note: It might also make sense to do the UTF-16 conversion here (would
  /// simplify the backend).
  bool Sema::CheckObjCString(Expr *Arg) {
    Arg = Arg->IgnoreParenCasts();
    StringLiteral *Literal = dyn_cast<StringLiteral>(Arg);
  
    if (!Literal || !Literal->isAscii()) {
      Diag(Arg->getBeginLoc(), diag::err_cfstring_literal_not_string_constant)
          << Arg->getSourceRange();
      return true;
    }
  
    if (Literal->containsNonAsciiOrNull()) {
      StringRef String = Literal->getString();
      unsigned NumBytes = String.size();
      SmallVector<llvm::UTF16, 128> ToBuf(NumBytes);
      const llvm::UTF8 *FromPtr = (const llvm::UTF8 *)String.data();
      llvm::UTF16 *ToPtr = &ToBuf[0];
  
      llvm::ConversionResult Result =
          llvm::ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, &ToPtr,
                                   ToPtr + NumBytes, llvm::strictConversion);
      // Check for conversion failure.
      if (Result != llvm::conversionOK)
        Diag(Arg->getBeginLoc(), diag::warn_cfstring_truncated)
            << Arg->getSourceRange();
    }
    return false;
  }
  
  /// CheckObjCString - Checks that the format string argument to the os_log()
  /// and os_trace() functions is correct, and converts it to const char *.
  ExprResult Sema::CheckOSLogFormatStringArg(Expr *Arg) {
    Arg = Arg->IgnoreParenCasts();
    auto *Literal = dyn_cast<StringLiteral>(Arg);
    if (!Literal) {
      if (auto *ObjcLiteral = dyn_cast<ObjCStringLiteral>(Arg)) {
        Literal = ObjcLiteral->getString();
      }
    }
  
    if (!Literal || (!Literal->isAscii() && !Literal->isUTF8())) {
      return ExprError(
          Diag(Arg->getBeginLoc(), diag::err_os_log_format_not_string_constant)
          << Arg->getSourceRange());
    }
  
    ExprResult Result(Literal);
    QualType ResultTy = Context.getPointerType(Context.CharTy.withConst());
    InitializedEntity Entity =
        InitializedEntity::InitializeParameter(Context, ResultTy, false);
    Result = PerformCopyInitialization(Entity, SourceLocation(), Result);
    return Result;
  }
  
  /// Check that the user is calling the appropriate va_start builtin for the
  /// target and calling convention.
  static bool checkVAStartABI(Sema &S, unsigned BuiltinID, Expr *Fn) {
    const llvm::Triple &TT = S.Context.getTargetInfo().getTriple();
    bool IsX64 = TT.getArch() == llvm::Triple::x86_64;
    bool IsAArch64 = (TT.getArch() == llvm::Triple::aarch64 ||
                      TT.getArch() == llvm::Triple::aarch64_32);
    bool IsWindows = TT.isOSWindows();
    bool IsMSVAStart = BuiltinID == Builtin::BI__builtin_ms_va_start;
    if (IsX64 || IsAArch64) {
      CallingConv CC = CC_C;
      if (const FunctionDecl *FD = S.getCurFunctionDecl())
        CC = FD->getType()->castAs<FunctionType>()->getCallConv();
      if (IsMSVAStart) {
        // Don't allow this in System V ABI functions.
        if (CC == CC_X86_64SysV || (!IsWindows && CC != CC_Win64))
          return S.Diag(Fn->getBeginLoc(),
                        diag::err_ms_va_start_used_in_sysv_function);
      } else {
        // On x86-64/AArch64 Unix, don't allow this in Win64 ABI functions.
        // On x64 Windows, don't allow this in System V ABI functions.
        // (Yes, that means there's no corresponding way to support variadic
        // System V ABI functions on Windows.)
        if ((IsWindows && CC == CC_X86_64SysV) ||
            (!IsWindows && CC == CC_Win64))
          return S.Diag(Fn->getBeginLoc(),
                        diag::err_va_start_used_in_wrong_abi_function)
                 << !IsWindows;
      }
      return false;
    }
  
    if (IsMSVAStart)
      return S.Diag(Fn->getBeginLoc(), diag::err_builtin_x64_aarch64_only);
    return false;
  }
  
  static bool checkVAStartIsInVariadicFunction(Sema &S, Expr *Fn,
                                               ParmVarDecl **LastParam = nullptr) {
    // Determine whether the current function, block, or obj-c method is variadic
    // and get its parameter list.
    bool IsVariadic = false;
    ArrayRef<ParmVarDecl *> Params;
    DeclContext *Caller = S.CurContext;
    if (auto *Block = dyn_cast<BlockDecl>(Caller)) {
      IsVariadic = Block->isVariadic();
      Params = Block->parameters();
    } else if (auto *FD = dyn_cast<FunctionDecl>(Caller)) {
      IsVariadic = FD->isVariadic();
      Params = FD->parameters();
    } else if (auto *MD = dyn_cast<ObjCMethodDecl>(Caller)) {
      IsVariadic = MD->isVariadic();
      // FIXME: This isn't correct for methods (results in bogus warning).
      Params = MD->parameters();
    } else if (isa<CapturedDecl>(Caller)) {
      // We don't support va_start in a CapturedDecl.
      S.Diag(Fn->getBeginLoc(), diag::err_va_start_captured_stmt);
      return true;
    } else {
      // This must be some other declcontext that parses exprs.
      S.Diag(Fn->getBeginLoc(), diag::err_va_start_outside_function);
      return true;
    }
  
    if (!IsVariadic) {
      S.Diag(Fn->getBeginLoc(), diag::err_va_start_fixed_function);
      return true;
    }
  
    if (LastParam)
      *LastParam = Params.empty() ? nullptr : Params.back();
  
    return false;
  }
  
  /// Check the arguments to '__builtin_va_start' or '__builtin_ms_va_start'
  /// for validity.  Emit an error and return true on failure; return false
  /// on success.
  bool Sema::SemaBuiltinVAStart(unsigned BuiltinID, CallExpr *TheCall) {
    Expr *Fn = TheCall->getCallee();
  
    if (checkVAStartABI(*this, BuiltinID, Fn))
      return true;
  
    if (TheCall->getNumArgs() > 2) {
      Diag(TheCall->getArg(2)->getBeginLoc(),
           diag::err_typecheck_call_too_many_args)
          << 0 /*function call*/ << 2 << TheCall->getNumArgs()
          << Fn->getSourceRange()
          << SourceRange(TheCall->getArg(2)->getBeginLoc(),
                         (*(TheCall->arg_end() - 1))->getEndLoc());
      return true;
    }
  
    if (TheCall->getNumArgs() < 2) {
      return Diag(TheCall->getEndLoc(),
                  diag::err_typecheck_call_too_few_args_at_least)
             << 0 /*function call*/ << 2 << TheCall->getNumArgs();
    }
  
    // Type-check the first argument normally.
    if (checkBuiltinArgument(*this, TheCall, 0))
      return true;
  
    // Check that the current function is variadic, and get its last parameter.
    ParmVarDecl *LastParam;
    if (checkVAStartIsInVariadicFunction(*this, Fn, &LastParam))
      return true;
  
    // Verify that the second argument to the builtin is the last argument of the
    // current function or method.
    bool SecondArgIsLastNamedArgument = false;
    const Expr *Arg = TheCall->getArg(1)->IgnoreParenCasts();
  
    // These are valid if SecondArgIsLastNamedArgument is false after the next
    // block.
    QualType Type;
    SourceLocation ParamLoc;
    bool IsCRegister = false;
  
    if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(Arg)) {
      if (const ParmVarDecl *PV = dyn_cast<ParmVarDecl>(DR->getDecl())) {
        SecondArgIsLastNamedArgument = PV == LastParam;
  
        Type = PV->getType();
        ParamLoc = PV->getLocation();
        IsCRegister =
            PV->getStorageClass() == SC_Register && !getLangOpts().CPlusPlus;
      }
    }
  
    if (!SecondArgIsLastNamedArgument)
      Diag(TheCall->getArg(1)->getBeginLoc(),
           diag::warn_second_arg_of_va_start_not_last_named_param);
    else if (IsCRegister || Type->isReferenceType() ||
             Type->isSpecificBuiltinType(BuiltinType::Float) || [=] {
               // Promotable integers are UB, but enumerations need a bit of
               // extra checking to see what their promotable type actually is.
               if (!Type->isPromotableIntegerType())
                 return false;
               if (!Type->isEnumeralType())
                 return true;
               const EnumDecl *ED = Type->castAs<EnumType>()->getDecl();
               return !(ED &&
                        Context.typesAreCompatible(ED->getPromotionType(), Type));
             }()) {
      unsigned Reason = 0;
      if (Type->isReferenceType())  Reason = 1;
      else if (IsCRegister)         Reason = 2;
      Diag(Arg->getBeginLoc(), diag::warn_va_start_type_is_undefined) << Reason;
      Diag(ParamLoc, diag::note_parameter_type) << Type;
    }
  
    TheCall->setType(Context.VoidTy);
    return false;
  }
  
  bool Sema::SemaBuiltinVAStartARMMicrosoft(CallExpr *Call) {
    // void __va_start(va_list *ap, const char *named_addr, size_t slot_size,
    //                 const char *named_addr);
  
    Expr *Func = Call->getCallee();
  
    if (Call->getNumArgs() < 3)
      return Diag(Call->getEndLoc(),
                  diag::err_typecheck_call_too_few_args_at_least)
             << 0 /*function call*/ << 3 << Call->getNumArgs();
  
    // Type-check the first argument normally.
    if (checkBuiltinArgument(*this, Call, 0))
      return true;
  
    // Check that the current function is variadic.
    if (checkVAStartIsInVariadicFunction(*this, Func))
      return true;
  
    // __va_start on Windows does not validate the parameter qualifiers
  
    const Expr *Arg1 = Call->getArg(1)->IgnoreParens();
    const Type *Arg1Ty = Arg1->getType().getCanonicalType().getTypePtr();
  
    const Expr *Arg2 = Call->getArg(2)->IgnoreParens();
    const Type *Arg2Ty = Arg2->getType().getCanonicalType().getTypePtr();
  
    const QualType &ConstCharPtrTy =
        Context.getPointerType(Context.CharTy.withConst());
    if (!Arg1Ty->isPointerType() ||
        Arg1Ty->getPointeeType().withoutLocalFastQualifiers() != Context.CharTy)
      Diag(Arg1->getBeginLoc(), diag::err_typecheck_convert_incompatible)
          << Arg1->getType() << ConstCharPtrTy << 1 /* different class */
          << 0                                      /* qualifier difference */
          << 3                                      /* parameter mismatch */
          << 2 << Arg1->getType() << ConstCharPtrTy;
  
    const QualType SizeTy = Context.getSizeType();
    if (Arg2Ty->getCanonicalTypeInternal().withoutLocalFastQualifiers() != SizeTy)
      Diag(Arg2->getBeginLoc(), diag::err_typecheck_convert_incompatible)
          << Arg2->getType() << SizeTy << 1 /* different class */
          << 0                              /* qualifier difference */
          << 3                              /* parameter mismatch */
          << 3 << Arg2->getType() << SizeTy;
  
    return false;
  }
  
  /// SemaBuiltinUnorderedCompare - Handle functions like __builtin_isgreater and
  /// friends.  This is declared to take (...), so we have to check everything.
  bool Sema::SemaBuiltinUnorderedCompare(CallExpr *TheCall) {
    if (TheCall->getNumArgs() < 2)
      return Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args)
             << 0 << 2 << TheCall->getNumArgs() /*function call*/;
    if (TheCall->getNumArgs() > 2)
      return Diag(TheCall->getArg(2)->getBeginLoc(),
                  diag::err_typecheck_call_too_many_args)
             << 0 /*function call*/ << 2 << TheCall->getNumArgs()
             << SourceRange(TheCall->getArg(2)->getBeginLoc(),
                            (*(TheCall->arg_end() - 1))->getEndLoc());
  
    ExprResult OrigArg0 = TheCall->getArg(0);
    ExprResult OrigArg1 = TheCall->getArg(1);
  
    // Do standard promotions between the two arguments, returning their common
    // type.
    QualType Res = UsualArithmeticConversions(
        OrigArg0, OrigArg1, TheCall->getExprLoc(), ACK_Comparison);
    if (OrigArg0.isInvalid() || OrigArg1.isInvalid())
      return true;
  
    // Make sure any conversions are pushed back into the call; this is
    // type safe since unordered compare builtins are declared as "_Bool
    // foo(...)".
    TheCall->setArg(0, OrigArg0.get());
    TheCall->setArg(1, OrigArg1.get());
  
    if (OrigArg0.get()->isTypeDependent() || OrigArg1.get()->isTypeDependent())
      return false;
  
    // If the common type isn't a real floating type, then the arguments were
    // invalid for this operation.
    if (Res.isNull() || !Res->isRealFloatingType())
      return Diag(OrigArg0.get()->getBeginLoc(),
                  diag::err_typecheck_call_invalid_ordered_compare)
             << OrigArg0.get()->getType() << OrigArg1.get()->getType()
             << SourceRange(OrigArg0.get()->getBeginLoc(),
                            OrigArg1.get()->getEndLoc());
  
    return false;
  }
  
  /// SemaBuiltinSemaBuiltinFPClassification - Handle functions like
  /// __builtin_isnan and friends.  This is declared to take (...), so we have
  /// to check everything. We expect the last argument to be a floating point
  /// value.
  bool Sema::SemaBuiltinFPClassification(CallExpr *TheCall, unsigned NumArgs) {
    if (TheCall->getNumArgs() < NumArgs)
      return Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args)
             << 0 << NumArgs << TheCall->getNumArgs() /*function call*/;
    if (TheCall->getNumArgs() > NumArgs)
      return Diag(TheCall->getArg(NumArgs)->getBeginLoc(),
                  diag::err_typecheck_call_too_many_args)
             << 0 /*function call*/ << NumArgs << TheCall->getNumArgs()
             << SourceRange(TheCall->getArg(NumArgs)->getBeginLoc(),
                            (*(TheCall->arg_end() - 1))->getEndLoc());
  
    // __builtin_fpclassify is the only case where NumArgs != 1, so we can count
    // on all preceding parameters just being int.  Try all of those.
    for (unsigned i = 0; i < NumArgs - 1; ++i) {
      Expr *Arg = TheCall->getArg(i);
  
      if (Arg->isTypeDependent())
        return false;
  
      ExprResult Res = PerformImplicitConversion(Arg, Context.IntTy, AA_Passing);
  
      if (Res.isInvalid())
        return true;
      TheCall->setArg(i, Res.get());
    }
  
    Expr *OrigArg = TheCall->getArg(NumArgs-1);
  
    if (OrigArg->isTypeDependent())
      return false;
  
    // Usual Unary Conversions will convert half to float, which we want for
    // machines that use fp16 conversion intrinsics. Else, we wnat to leave the
    // type how it is, but do normal L->Rvalue conversions.
    if (Context.getTargetInfo().useFP16ConversionIntrinsics())
      OrigArg = UsualUnaryConversions(OrigArg).get();
    else
      OrigArg = DefaultFunctionArrayLvalueConversion(OrigArg).get();
    TheCall->setArg(NumArgs - 1, OrigArg);
  
    // This operation requires a non-_Complex floating-point number.
    if (!OrigArg->getType()->isRealFloatingType())
      return Diag(OrigArg->getBeginLoc(),
                  diag::err_typecheck_call_invalid_unary_fp)
             << OrigArg->getType() << OrigArg->getSourceRange();
  
    return false;
  }
  
  // Customized Sema Checking for VSX builtins that have the following signature:
  // vector [...] builtinName(vector [...], vector [...], const int);
  // Which takes the same type of vectors (any legal vector type) for the first
  // two arguments and takes compile time constant for the third argument.
  // Example builtins are :
  // vector double vec_xxpermdi(vector double, vector double, int);
  // vector short vec_xxsldwi(vector short, vector short, int);
  bool Sema::SemaBuiltinVSX(CallExpr *TheCall) {
    unsigned ExpectedNumArgs = 3;
    if (TheCall->getNumArgs() < ExpectedNumArgs)
      return Diag(TheCall->getEndLoc(),
                  diag::err_typecheck_call_too_few_args_at_least)
             << 0 /*function call*/ << ExpectedNumArgs << TheCall->getNumArgs()
             << TheCall->getSourceRange();
  
    if (TheCall->getNumArgs() > ExpectedNumArgs)
      return Diag(TheCall->getEndLoc(),
                  diag::err_typecheck_call_too_many_args_at_most)
             << 0 /*function call*/ << ExpectedNumArgs << TheCall->getNumArgs()
             << TheCall->getSourceRange();
  
    // Check the third argument is a compile time constant
    llvm::APSInt Value;
    if(!TheCall->getArg(2)->isIntegerConstantExpr(Value, Context))
      return Diag(TheCall->getBeginLoc(),
                  diag::err_vsx_builtin_nonconstant_argument)
             << 3 /* argument index */ << TheCall->getDirectCallee()
             << SourceRange(TheCall->getArg(2)->getBeginLoc(),
                            TheCall->getArg(2)->getEndLoc());
  
    QualType Arg1Ty = TheCall->getArg(0)->getType();
    QualType Arg2Ty = TheCall->getArg(1)->getType();
  
    // Check the type of argument 1 and argument 2 are vectors.
    SourceLocation BuiltinLoc = TheCall->getBeginLoc();
    if ((!Arg1Ty->isVectorType() && !Arg1Ty->isDependentType()) ||
        (!Arg2Ty->isVectorType() && !Arg2Ty->isDependentType())) {
      return Diag(BuiltinLoc, diag::err_vec_builtin_non_vector)
             << TheCall->getDirectCallee()
             << SourceRange(TheCall->getArg(0)->getBeginLoc(),
                            TheCall->getArg(1)->getEndLoc());
    }
  
    // Check the first two arguments are the same type.
    if (!Context.hasSameUnqualifiedType(Arg1Ty, Arg2Ty)) {
      return Diag(BuiltinLoc, diag::err_vec_builtin_incompatible_vector)
             << TheCall->getDirectCallee()
             << SourceRange(TheCall->getArg(0)->getBeginLoc(),
                            TheCall->getArg(1)->getEndLoc());
    }
  
    // When default clang type checking is turned off and the customized type
    // checking is used, the returning type of the function must be explicitly
    // set. Otherwise it is _Bool by default.
    TheCall->setType(Arg1Ty);
  
    return false;
  }
  
  /// SemaBuiltinShuffleVector - Handle __builtin_shufflevector.
  // This is declared to take (...), so we have to check everything.
  ExprResult Sema::SemaBuiltinShuffleVector(CallExpr *TheCall) {
    if (TheCall->getNumArgs() < 2)
      return ExprError(Diag(TheCall->getEndLoc(),
                            diag::err_typecheck_call_too_few_args_at_least)
                       << 0 /*function call*/ << 2 << TheCall->getNumArgs()
                       << TheCall->getSourceRange());
  
    // Determine which of the following types of shufflevector we're checking:
    // 1) unary, vector mask: (lhs, mask)
    // 2) binary, scalar mask: (lhs, rhs, index, ..., index)
    QualType resType = TheCall->getArg(0)->getType();
    unsigned numElements = 0;
  
    if (!TheCall->getArg(0)->isTypeDependent() &&
        !TheCall->getArg(1)->isTypeDependent()) {
      QualType LHSType = TheCall->getArg(0)->getType();
      QualType RHSType = TheCall->getArg(1)->getType();
  
      if (!LHSType->isVectorType() || !RHSType->isVectorType())
        return ExprError(
            Diag(TheCall->getBeginLoc(), diag::err_vec_builtin_non_vector)
            << TheCall->getDirectCallee()
            << SourceRange(TheCall->getArg(0)->getBeginLoc(),
                           TheCall->getArg(1)->getEndLoc()));
  
      numElements = LHSType->castAs<VectorType>()->getNumElements();
      unsigned numResElements = TheCall->getNumArgs() - 2;
  
      // Check to see if we have a call with 2 vector arguments, the unary shuffle
      // with mask.  If so, verify that RHS is an integer vector type with the
      // same number of elts as lhs.
      if (TheCall->getNumArgs() == 2) {
        if (!RHSType->hasIntegerRepresentation() ||
            RHSType->castAs<VectorType>()->getNumElements() != numElements)
          return ExprError(Diag(TheCall->getBeginLoc(),
                                diag::err_vec_builtin_incompatible_vector)
                           << TheCall->getDirectCallee()
                           << SourceRange(TheCall->getArg(1)->getBeginLoc(),
                                          TheCall->getArg(1)->getEndLoc()));
      } else if (!Context.hasSameUnqualifiedType(LHSType, RHSType)) {
        return ExprError(Diag(TheCall->getBeginLoc(),
                              diag::err_vec_builtin_incompatible_vector)
                         << TheCall->getDirectCallee()
                         << SourceRange(TheCall->getArg(0)->getBeginLoc(),
                                        TheCall->getArg(1)->getEndLoc()));
      } else if (numElements != numResElements) {
        QualType eltType = LHSType->castAs<VectorType>()->getElementType();
        resType = Context.getVectorType(eltType, numResElements,
                                        VectorType::GenericVector);
      }
    }
  
    for (unsigned i = 2; i < TheCall->getNumArgs(); i++) {
      if (TheCall->getArg(i)->isTypeDependent() ||
          TheCall->getArg(i)->isValueDependent())
        continue;
  
      llvm::APSInt Result(32);
      if (!TheCall->getArg(i)->isIntegerConstantExpr(Result, Context))
        return ExprError(Diag(TheCall->getBeginLoc(),
                              diag::err_shufflevector_nonconstant_argument)
                         << TheCall->getArg(i)->getSourceRange());
  
      // Allow -1 which will be translated to undef in the IR.
      if (Result.isSigned() && Result.isAllOnesValue())
        continue;
  
      if (Result.getActiveBits() > 64 || Result.getZExtValue() >= numElements*2)
        return ExprError(Diag(TheCall->getBeginLoc(),
                              diag::err_shufflevector_argument_too_large)
                         << TheCall->getArg(i)->getSourceRange());
    }
  
    SmallVector<Expr*, 32> exprs;
  
    for (unsigned i = 0, e = TheCall->getNumArgs(); i != e; i++) {
      exprs.push_back(TheCall->getArg(i));
      TheCall->setArg(i, nullptr);
    }
  
    return new (Context) ShuffleVectorExpr(Context, exprs, resType,
                                           TheCall->getCallee()->getBeginLoc(),
                                           TheCall->getRParenLoc());
  }
  
  /// SemaConvertVectorExpr - Handle __builtin_convertvector
  ExprResult Sema::SemaConvertVectorExpr(Expr *E, TypeSourceInfo *TInfo,
                                         SourceLocation BuiltinLoc,
                                         SourceLocation RParenLoc) {
    ExprValueKind VK = VK_RValue;
    ExprObjectKind OK = OK_Ordinary;
    QualType DstTy = TInfo->getType();
    QualType SrcTy = E->getType();
  
    if (!SrcTy->isVectorType() && !SrcTy->isDependentType())
      return ExprError(Diag(BuiltinLoc,
                            diag::err_convertvector_non_vector)
                       << E->getSourceRange());
    if (!DstTy->isVectorType() && !DstTy->isDependentType())
      return ExprError(Diag(BuiltinLoc,
                            diag::err_convertvector_non_vector_type));
  
    if (!SrcTy->isDependentType() && !DstTy->isDependentType()) {
      unsigned SrcElts = SrcTy->castAs<VectorType>()->getNumElements();
      unsigned DstElts = DstTy->castAs<VectorType>()->getNumElements();
      if (SrcElts != DstElts)
        return ExprError(Diag(BuiltinLoc,
                              diag::err_convertvector_incompatible_vector)
                         << E->getSourceRange());
    }
  
    return new (Context)
        ConvertVectorExpr(E, TInfo, DstTy, VK, OK, BuiltinLoc, RParenLoc);
  }
  
  /// SemaBuiltinPrefetch - Handle __builtin_prefetch.
  // This is declared to take (const void*, ...) and can take two
  // optional constant int args.
  bool Sema::SemaBuiltinPrefetch(CallExpr *TheCall) {
    unsigned NumArgs = TheCall->getNumArgs();
  
    if (NumArgs > 3)
      return Diag(TheCall->getEndLoc(),
                  diag::err_typecheck_call_too_many_args_at_most)
             << 0 /*function call*/ << 3 << NumArgs << TheCall->getSourceRange();
  
    // Argument 0 is checked for us and the remaining arguments must be
    // constant integers.
    for (unsigned i = 1; i != NumArgs; ++i)
      if (SemaBuiltinConstantArgRange(TheCall, i, 0, i == 1 ? 1 : 3))
        return true;
  
    return false;
  }
  
  /// SemaBuiltinAssume - Handle __assume (MS Extension).
  // __assume does not evaluate its arguments, and should warn if its argument
  // has side effects.
  bool Sema::SemaBuiltinAssume(CallExpr *TheCall) {
    Expr *Arg = TheCall->getArg(0);
    if (Arg->isInstantiationDependent()) return false;
  
    if (Arg->HasSideEffects(Context))
      Diag(Arg->getBeginLoc(), diag::warn_assume_side_effects)
          << Arg->getSourceRange()
          << cast<FunctionDecl>(TheCall->getCalleeDecl())->getIdentifier();
  
    return false;
  }
  
  /// Handle __builtin_alloca_with_align. This is declared
  /// as (size_t, size_t) where the second size_t must be a power of 2 greater
  /// than 8.
  bool Sema::SemaBuiltinAllocaWithAlign(CallExpr *TheCall) {
    // The alignment must be a constant integer.
    Expr *Arg = TheCall->getArg(1);
  
    // We can't check the value of a dependent argument.
    if (!Arg->isTypeDependent() && !Arg->isValueDependent()) {
      if (const auto *UE =
              dyn_cast<UnaryExprOrTypeTraitExpr>(Arg->IgnoreParenImpCasts()))
        if (UE->getKind() == UETT_AlignOf ||
            UE->getKind() == UETT_PreferredAlignOf)
          Diag(TheCall->getBeginLoc(), diag::warn_alloca_align_alignof)
              << Arg->getSourceRange();
  
      llvm::APSInt Result = Arg->EvaluateKnownConstInt(Context);
  
      if (!Result.isPowerOf2())
        return Diag(TheCall->getBeginLoc(), diag::err_alignment_not_power_of_two)
               << Arg->getSourceRange();
  
      if (Result < Context.getCharWidth())
        return Diag(TheCall->getBeginLoc(), diag::err_alignment_too_small)
               << (unsigned)Context.getCharWidth() << Arg->getSourceRange();
  
      if (Result > std::numeric_limits<int32_t>::max())
        return Diag(TheCall->getBeginLoc(), diag::err_alignment_too_big)
               << std::numeric_limits<int32_t>::max() << Arg->getSourceRange();
    }
  
    return false;
  }
  
  /// Handle __builtin_assume_aligned. This is declared
  /// as (const void*, size_t, ...) and can take one optional constant int arg.
  bool Sema::SemaBuiltinAssumeAligned(CallExpr *TheCall) {
    unsigned NumArgs = TheCall->getNumArgs();
  
    if (NumArgs > 3)
      return Diag(TheCall->getEndLoc(),
                  diag::err_typecheck_call_too_many_args_at_most)
             << 0 /*function call*/ << 3 << NumArgs << TheCall->getSourceRange();
  
    // The alignment must be a constant integer.
    Expr *Arg = TheCall->getArg(1);
  
    // We can't check the value of a dependent argument.
    if (!Arg->isTypeDependent() && !Arg->isValueDependent()) {
      llvm::APSInt Result;
      if (SemaBuiltinConstantArg(TheCall, 1, Result))
        return true;
  
      if (!Result.isPowerOf2())
        return Diag(TheCall->getBeginLoc(), diag::err_alignment_not_power_of_two)
               << Arg->getSourceRange();
  
      // Alignment calculations can wrap around if it's greater than 2**29.
      unsigned MaximumAlignment = 536870912;
      if (Result > MaximumAlignment)
        Diag(TheCall->getBeginLoc(), diag::warn_assume_aligned_too_great)
            << Arg->getSourceRange() << MaximumAlignment;
    }
  
    if (NumArgs > 2) {
      ExprResult Arg(TheCall->getArg(2));
      InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
        Context.getSizeType(), false);
      Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
      if (Arg.isInvalid()) return true;
      TheCall->setArg(2, Arg.get());
    }
  
    return false;
  }
  
  bool Sema::SemaBuiltinOSLogFormat(CallExpr *TheCall) {
    unsigned BuiltinID =
        cast<FunctionDecl>(TheCall->getCalleeDecl())->getBuiltinID();
    bool IsSizeCall = BuiltinID == Builtin::BI__builtin_os_log_format_buffer_size;
  
    unsigned NumArgs = TheCall->getNumArgs();
    unsigned NumRequiredArgs = IsSizeCall ? 1 : 2;
    if (NumArgs < NumRequiredArgs) {
      return Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args)
             << 0 /* function call */ << NumRequiredArgs << NumArgs
             << TheCall->getSourceRange();
    }
    if (NumArgs >= NumRequiredArgs + 0x100) {
      return Diag(TheCall->getEndLoc(),
                  diag::err_typecheck_call_too_many_args_at_most)
             << 0 /* function call */ << (NumRequiredArgs + 0xff) << NumArgs
             << TheCall->getSourceRange();
    }
    unsigned i = 0;
  
    // For formatting call, check buffer arg.
    if (!IsSizeCall) {
      ExprResult Arg(TheCall->getArg(i));
      InitializedEntity Entity = InitializedEntity::InitializeParameter(
          Context, Context.VoidPtrTy, false);
      Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
      if (Arg.isInvalid())
        return true;
      TheCall->setArg(i, Arg.get());
      i++;
    }
  
    // Check string literal arg.
    unsigned FormatIdx = i;
    {
      ExprResult Arg = CheckOSLogFormatStringArg(TheCall->getArg(i));
      if (Arg.isInvalid())
        return true;
      TheCall->setArg(i, Arg.get());
      i++;
    }
  
    // Make sure variadic args are scalar.
    unsigned FirstDataArg = i;
    while (i < NumArgs) {
      ExprResult Arg = DefaultVariadicArgumentPromotion(
          TheCall->getArg(i), VariadicFunction, nullptr);
      if (Arg.isInvalid())
        return true;
      CharUnits ArgSize = Context.getTypeSizeInChars(Arg.get()->getType());
      if (ArgSize.getQuantity() >= 0x100) {
        return Diag(Arg.get()->getEndLoc(), diag::err_os_log_argument_too_big)
               << i << (int)ArgSize.getQuantity() << 0xff
               << TheCall->getSourceRange();
      }
      TheCall->setArg(i, Arg.get());
      i++;
    }
  
    // Check formatting specifiers. NOTE: We're only doing this for the non-size
    // call to avoid duplicate diagnostics.
    if (!IsSizeCall) {
      llvm::SmallBitVector CheckedVarArgs(NumArgs, false);
      ArrayRef<const Expr *> Args(TheCall->getArgs(), TheCall->getNumArgs());
      bool Success = CheckFormatArguments(
          Args, /*HasVAListArg*/ false, FormatIdx, FirstDataArg, FST_OSLog,
          VariadicFunction, TheCall->getBeginLoc(), SourceRange(),
          CheckedVarArgs);
      if (!Success)
        return true;
    }
  
    if (IsSizeCall) {
      TheCall->setType(Context.getSizeType());
    } else {
      TheCall->setType(Context.VoidPtrTy);
    }
    return false;
  }
  
  /// SemaBuiltinConstantArg - Handle a check if argument ArgNum of CallExpr
  /// TheCall is a constant expression.
  bool Sema::SemaBuiltinConstantArg(CallExpr *TheCall, int ArgNum,
                                    llvm::APSInt &Result) {
    Expr *Arg = TheCall->getArg(ArgNum);
    DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
    FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl());
  
    if (Arg->isTypeDependent() || Arg->isValueDependent()) return false;
  
    if (!Arg->isIntegerConstantExpr(Result, Context))
      return Diag(TheCall->getBeginLoc(), diag::err_constant_integer_arg_type)
             << FDecl->getDeclName() << Arg->getSourceRange();
  
    return false;
  }
  
  /// SemaBuiltinConstantArgRange - Handle a check if argument ArgNum of CallExpr
  /// TheCall is a constant expression in the range [Low, High].
  bool Sema::SemaBuiltinConstantArgRange(CallExpr *TheCall, int ArgNum,
                                         int Low, int High, bool RangeIsError) {
    if (isConstantEvaluated())
      return false;
    llvm::APSInt Result;
  
    // We can't check the value of a dependent argument.
    Expr *Arg = TheCall->getArg(ArgNum);
    if (Arg->isTypeDependent() || Arg->isValueDependent())
      return false;
  
    // Check constant-ness first.
    if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
      return true;
  
    if (Result.getSExtValue() < Low || Result.getSExtValue() > High) {
      if (RangeIsError)
        return Diag(TheCall->getBeginLoc(), diag::err_argument_invalid_range)
               << Result.toString(10) << Low << High << Arg->getSourceRange();
      else
        // Defer the warning until we know if the code will be emitted so that
        // dead code can ignore this.
        DiagRuntimeBehavior(TheCall->getBeginLoc(), TheCall,
                            PDiag(diag::warn_argument_invalid_range)
                                << Result.toString(10) << Low << High
                                << Arg->getSourceRange());
    }
  
    return false;
  }
  
  /// SemaBuiltinConstantArgMultiple - Handle a check if argument ArgNum of CallExpr
  /// TheCall is a constant expression is a multiple of Num..
  bool Sema::SemaBuiltinConstantArgMultiple(CallExpr *TheCall, int ArgNum,
                                            unsigned Num) {
    llvm::APSInt Result;
  
    // We can't check the value of a dependent argument.
    Expr *Arg = TheCall->getArg(ArgNum);
    if (Arg->isTypeDependent() || Arg->isValueDependent())
      return false;
  
    // Check constant-ness first.
    if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
      return true;
  
    if (Result.getSExtValue() % Num != 0)
      return Diag(TheCall->getBeginLoc(), diag::err_argument_not_multiple)
             << Num << Arg->getSourceRange();
  
    return false;
  }
  
  /// SemaBuiltinConstantArgPower2 - Check if argument ArgNum of TheCall is a
  /// constant expression representing a power of 2.
  bool Sema::SemaBuiltinConstantArgPower2(CallExpr *TheCall, int ArgNum) {
    llvm::APSInt Result;
  
    // We can't check the value of a dependent argument.
    Expr *Arg = TheCall->getArg(ArgNum);
    if (Arg->isTypeDependent() || Arg->isValueDependent())
      return false;
  
    // Check constant-ness first.
    if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
      return true;
  
    // Bit-twiddling to test for a power of 2: for x > 0, x & (x-1) is zero if
    // and only if x is a power of 2.
    if (Result.isStrictlyPositive() && (Result & (Result - 1)) == 0)
      return false;
  
    return Diag(TheCall->getBeginLoc(), diag::err_argument_not_power_of_2)
           << Arg->getSourceRange();
  }
  
  static bool IsShiftedByte(llvm::APSInt Value) {
    if (Value.isNegative())
      return false;
  
    // Check if it's a shifted byte, by shifting it down
    while (true) {
      // If the value fits in the bottom byte, the check passes.
      if (Value < 0x100)
        return true;
  
      // Otherwise, if the value has _any_ bits in the bottom byte, the check
      // fails.
      if ((Value & 0xFF) != 0)
        return false;
  
      // If the bottom 8 bits are all 0, but something above that is nonzero,
      // then shifting the value right by 8 bits won't affect whether it's a
      // shifted byte or not. So do that, and go round again.
      Value >>= 8;
    }
  }
  
  /// SemaBuiltinConstantArgShiftedByte - Check if argument ArgNum of TheCall is
  /// a constant expression representing an arbitrary byte value shifted left by
  /// a multiple of 8 bits.
  bool Sema::SemaBuiltinConstantArgShiftedByte(CallExpr *TheCall, int ArgNum) {
    llvm::APSInt Result;
  
    // We can't check the value of a dependent argument.
    Expr *Arg = TheCall->getArg(ArgNum);
    if (Arg->isTypeDependent() || Arg->isValueDependent())
      return false;
  
    // Check constant-ness first.
    if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
      return true;
  
    if (IsShiftedByte(Result))
      return false;
  
    return Diag(TheCall->getBeginLoc(), diag::err_argument_not_shifted_byte)
           << Arg->getSourceRange();
  }
  
  /// SemaBuiltinConstantArgShiftedByteOr0xFF - Check if argument ArgNum of
  /// TheCall is a constant expression representing either a shifted byte value,
  /// or a value of the form 0x??FF (i.e. a member of the arithmetic progression
  /// 0x00FF, 0x01FF, ..., 0xFFFF). This strange range check is needed for some
  /// Arm MVE intrinsics.
  bool Sema::SemaBuiltinConstantArgShiftedByteOrXXFF(CallExpr *TheCall,
                                                     int ArgNum) {
    llvm::APSInt Result;
  
    // We can't check the value of a dependent argument.
    Expr *Arg = TheCall->getArg(ArgNum);
    if (Arg->isTypeDependent() || Arg->isValueDependent())
      return false;
  
    // Check constant-ness first.
    if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
      return true;
  
    // Check to see if it's in either of the required forms.
    if (IsShiftedByte(Result) ||
        (Result > 0 && Result < 0x10000 && (Result & 0xFF) == 0xFF))
      return false;
  
    return Diag(TheCall->getBeginLoc(),
                diag::err_argument_not_shifted_byte_or_xxff)
           << Arg->getSourceRange();
  }
  
  /// SemaBuiltinARMMemoryTaggingCall - Handle calls of memory tagging extensions
  bool Sema::SemaBuiltinARMMemoryTaggingCall(unsigned BuiltinID, CallExpr *TheCall) {
    if (BuiltinID == AArch64::BI__builtin_arm_irg) {
      if (checkArgCount(*this, TheCall, 2))
        return true;
      Expr *Arg0 = TheCall->getArg(0);
      Expr *Arg1 = TheCall->getArg(1);
  
      ExprResult FirstArg = DefaultFunctionArrayLvalueConversion(Arg0);
      if (FirstArg.isInvalid())
        return true;
      QualType FirstArgType = FirstArg.get()->getType();
      if (!FirstArgType->isAnyPointerType())
        return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_pointer)
                 << "first" << FirstArgType << Arg0->getSourceRange();
      TheCall->setArg(0, FirstArg.get());
  
      ExprResult SecArg = DefaultLvalueConversion(Arg1);
      if (SecArg.isInvalid())
        return true;
      QualType SecArgType = SecArg.get()->getType();
      if (!SecArgType->isIntegerType())
        return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_integer)
                 << "second" << SecArgType << Arg1->getSourceRange();
  
      // Derive the return type from the pointer argument.
      TheCall->setType(FirstArgType);
      return false;
    }
  
    if (BuiltinID == AArch64::BI__builtin_arm_addg) {
      if (checkArgCount(*this, TheCall, 2))
        return true;
  
      Expr *Arg0 = TheCall->getArg(0);
      ExprResult FirstArg = DefaultFunctionArrayLvalueConversion(Arg0);
      if (FirstArg.isInvalid())
        return true;
      QualType FirstArgType = FirstArg.get()->getType();
      if (!FirstArgType->isAnyPointerType())
        return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_pointer)
                 << "first" << FirstArgType << Arg0->getSourceRange();
      TheCall->setArg(0, FirstArg.get());
  
      // Derive the return type from the pointer argument.
      TheCall->setType(FirstArgType);
  
      // Second arg must be an constant in range [0,15]
      return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15);
    }
  
    if (BuiltinID == AArch64::BI__builtin_arm_gmi) {
      if (checkArgCount(*this, TheCall, 2))
        return true;
      Expr *Arg0 = TheCall->getArg(0);
      Expr *Arg1 = TheCall->getArg(1);
  
      ExprResult FirstArg = DefaultFunctionArrayLvalueConversion(Arg0);
      if (FirstArg.isInvalid())
        return true;
      QualType FirstArgType = FirstArg.get()->getType();
      if (!FirstArgType->isAnyPointerType())
        return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_pointer)
                 << "first" << FirstArgType << Arg0->getSourceRange();
  
      QualType SecArgType = Arg1->getType();
      if (!SecArgType->isIntegerType())
        return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_integer)
                 << "second" << SecArgType << Arg1->getSourceRange();
      TheCall->setType(Context.IntTy);
      return false;
    }
  
    if (BuiltinID == AArch64::BI__builtin_arm_ldg ||
        BuiltinID == AArch64::BI__builtin_arm_stg) {
      if (checkArgCount(*this, TheCall, 1))
        return true;
      Expr *Arg0 = TheCall->getArg(0);
      ExprResult FirstArg = DefaultFunctionArrayLvalueConversion(Arg0);
      if (FirstArg.isInvalid())
        return true;
  
      QualType FirstArgType = FirstArg.get()->getType();
      if (!FirstArgType->isAnyPointerType())
        return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_pointer)
                 << "first" << FirstArgType << Arg0->getSourceRange();
      TheCall->setArg(0, FirstArg.get());
  
      // Derive the return type from the pointer argument.
      if (BuiltinID == AArch64::BI__builtin_arm_ldg)
        TheCall->setType(FirstArgType);
      return false;
    }
  
    if (BuiltinID == AArch64::BI__builtin_arm_subp) {
      Expr *ArgA = TheCall->getArg(0);
      Expr *ArgB = TheCall->getArg(1);
  
      ExprResult ArgExprA = DefaultFunctionArrayLvalueConversion(ArgA);
      ExprResult ArgExprB = DefaultFunctionArrayLvalueConversion(ArgB);
  
      if (ArgExprA.isInvalid() || ArgExprB.isInvalid())
        return true;
  
      QualType ArgTypeA = ArgExprA.get()->getType();
      QualType ArgTypeB = ArgExprB.get()->getType();
  
      auto isNull = [&] (Expr *E) -> bool {
        return E->isNullPointerConstant(
                          Context, Expr::NPC_ValueDependentIsNotNull); };
  
      // argument should be either a pointer or null
      if (!ArgTypeA->isAnyPointerType() && !isNull(ArgA))
        return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_null_or_pointer)
          << "first" << ArgTypeA << ArgA->getSourceRange();
  
      if (!ArgTypeB->isAnyPointerType() && !isNull(ArgB))
        return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_null_or_pointer)
          << "second" << ArgTypeB << ArgB->getSourceRange();
  
      // Ensure Pointee types are compatible
      if (ArgTypeA->isAnyPointerType() && !isNull(ArgA) &&
          ArgTypeB->isAnyPointerType() && !isNull(ArgB)) {
        QualType pointeeA = ArgTypeA->getPointeeType();
        QualType pointeeB = ArgTypeB->getPointeeType();
        if (!Context.typesAreCompatible(
               Context.getCanonicalType(pointeeA).getUnqualifiedType(),
               Context.getCanonicalType(pointeeB).getUnqualifiedType())) {
          return Diag(TheCall->getBeginLoc(), diag::err_typecheck_sub_ptr_compatible)
            << ArgTypeA <<  ArgTypeB << ArgA->getSourceRange()
            << ArgB->getSourceRange();
        }
      }
  
      // at least one argument should be pointer type
      if (!ArgTypeA->isAnyPointerType() && !ArgTypeB->isAnyPointerType())
        return Diag(TheCall->getBeginLoc(), diag::err_memtag_any2arg_pointer)
          <<  ArgTypeA << ArgTypeB << ArgA->getSourceRange();
  
      if (isNull(ArgA)) // adopt type of the other pointer
        ArgExprA = ImpCastExprToType(ArgExprA.get(), ArgTypeB, CK_NullToPointer);
  
      if (isNull(ArgB))
        ArgExprB = ImpCastExprToType(ArgExprB.get(), ArgTypeA, CK_NullToPointer);
  
      TheCall->setArg(0, ArgExprA.get());
      TheCall->setArg(1, ArgExprB.get());
      TheCall->setType(Context.LongLongTy);
      return false;
    }
    assert(false && "Unhandled ARM MTE intrinsic");
    return true;
  }
  
  /// SemaBuiltinARMSpecialReg - Handle a check if argument ArgNum of CallExpr
  /// TheCall is an ARM/AArch64 special register string literal.
  bool Sema::SemaBuiltinARMSpecialReg(unsigned BuiltinID, CallExpr *TheCall,
                                      int ArgNum, unsigned ExpectedFieldNum,
                                      bool AllowName) {
    bool IsARMBuiltin = BuiltinID == ARM::BI__builtin_arm_rsr64 ||
                        BuiltinID == ARM::BI__builtin_arm_wsr64 ||
                        BuiltinID == ARM::BI__builtin_arm_rsr ||
                        BuiltinID == ARM::BI__builtin_arm_rsrp ||
                        BuiltinID == ARM::BI__builtin_arm_wsr ||
                        BuiltinID == ARM::BI__builtin_arm_wsrp;
    bool IsAArch64Builtin = BuiltinID == AArch64::BI__builtin_arm_rsr64 ||
                            BuiltinID == AArch64::BI__builtin_arm_wsr64 ||
                            BuiltinID == AArch64::BI__builtin_arm_rsr ||
                            BuiltinID == AArch64::BI__builtin_arm_rsrp ||
                            BuiltinID == AArch64::BI__builtin_arm_wsr ||
                            BuiltinID == AArch64::BI__builtin_arm_wsrp;
    assert((IsARMBuiltin || IsAArch64Builtin) && "Unexpected ARM builtin.");
  
    // We can't check the value of a dependent argument.
    Expr *Arg = TheCall->getArg(ArgNum);
    if (Arg->isTypeDependent() || Arg->isValueDependent())
      return false;
  
    // Check if the argument is a string literal.
    if (!isa<StringLiteral>(Arg->IgnoreParenImpCasts()))
      return Diag(TheCall->getBeginLoc(), diag::err_expr_not_string_literal)
             << Arg->getSourceRange();
  
    // Check the type of special register given.
    StringRef Reg = cast<StringLiteral>(Arg->IgnoreParenImpCasts())->getString();
    SmallVector<StringRef, 6> Fields;
    Reg.split(Fields, ":");
  
    if (Fields.size() != ExpectedFieldNum && !(AllowName && Fields.size() == 1))
      return Diag(TheCall->getBeginLoc(), diag::err_arm_invalid_specialreg)
             << Arg->getSourceRange();
  
    // If the string is the name of a register then we cannot check that it is
    // valid here but if the string is of one the forms described in ACLE then we
    // can check that the supplied fields are integers and within the valid
    // ranges.
    if (Fields.size() > 1) {
      bool FiveFields = Fields.size() == 5;
  
      bool ValidString = true;
      if (IsARMBuiltin) {
        ValidString &= Fields[0].startswith_lower("cp") ||
                       Fields[0].startswith_lower("p");
        if (ValidString)
          Fields[0] =
            Fields[0].drop_front(Fields[0].startswith_lower("cp") ? 2 : 1);
  
        ValidString &= Fields[2].startswith_lower("c");
        if (ValidString)
          Fields[2] = Fields[2].drop_front(1);
  
        if (FiveFields) {
          ValidString &= Fields[3].startswith_lower("c");
          if (ValidString)
            Fields[3] = Fields[3].drop_front(1);
        }
      }
  
      SmallVector<int, 5> Ranges;
      if (FiveFields)
        Ranges.append({IsAArch64Builtin ? 1 : 15, 7, 15, 15, 7});
      else
        Ranges.append({15, 7, 15});
  
      for (unsigned i=0; i<Fields.size(); ++i) {
        int IntField;
        ValidString &= !Fields[i].getAsInteger(10, IntField);
        ValidString &= (IntField >= 0 && IntField <= Ranges[i]);
      }
  
      if (!ValidString)
        return Diag(TheCall->getBeginLoc(), diag::err_arm_invalid_specialreg)
               << Arg->getSourceRange();
    } else if (IsAArch64Builtin && Fields.size() == 1) {
      // If the register name is one of those that appear in the condition below
      // and the special register builtin being used is one of the write builtins,
      // then we require that the argument provided for writing to the register
      // is an integer constant expression. This is because it will be lowered to
      // an MSR (immediate) instruction, so we need to know the immediate at
      // compile time.
      if (TheCall->getNumArgs() != 2)
        return false;
  
      std::string RegLower = Reg.lower();
      if (RegLower != "spsel" && RegLower != "daifset" && RegLower != "daifclr" &&
          RegLower != "pan" && RegLower != "uao")
        return false;
  
      return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15);
    }
  
    return false;
  }
  
  /// SemaBuiltinLongjmp - Handle __builtin_longjmp(void *env[5], int val).
  /// This checks that the target supports __builtin_longjmp and
  /// that val is a constant 1.
  bool Sema::SemaBuiltinLongjmp(CallExpr *TheCall) {
    if (!Context.getTargetInfo().hasSjLjLowering())
      return Diag(TheCall->getBeginLoc(), diag::err_builtin_longjmp_unsupported)
             << SourceRange(TheCall->getBeginLoc(), TheCall->getEndLoc());
  
    Expr *Arg = TheCall->getArg(1);
    llvm::APSInt Result;
  
    // TODO: This is less than ideal. Overload this to take a value.
    if (SemaBuiltinConstantArg(TheCall, 1, Result))
      return true;
  
    if (Result != 1)
      return Diag(TheCall->getBeginLoc(), diag::err_builtin_longjmp_invalid_val)
             << SourceRange(Arg->getBeginLoc(), Arg->getEndLoc());
  
    return false;
  }
  
  /// SemaBuiltinSetjmp - Handle __builtin_setjmp(void *env[5]).
  /// This checks that the target supports __builtin_setjmp.
  bool Sema::SemaBuiltinSetjmp(CallExpr *TheCall) {
    if (!Context.getTargetInfo().hasSjLjLowering())
      return Diag(TheCall->getBeginLoc(), diag::err_builtin_setjmp_unsupported)
             << SourceRange(TheCall->getBeginLoc(), TheCall->getEndLoc());
    return false;
  }
  
  namespace {
  
  class UncoveredArgHandler {
    enum { Unknown = -1, AllCovered = -2 };
  
    signed FirstUncoveredArg = Unknown;
    SmallVector<const Expr *, 4> DiagnosticExprs;
  
  public:
    UncoveredArgHandler() = default;
  
    bool hasUncoveredArg() const {
      return (FirstUncoveredArg >= 0);
    }
  
    unsigned getUncoveredArg() const {
      assert(hasUncoveredArg() && "no uncovered argument");
      return FirstUncoveredArg;
    }
  
    void setAllCovered() {
      // A string has been found with all arguments covered, so clear out
      // the diagnostics.
      DiagnosticExprs.clear();
      FirstUncoveredArg = AllCovered;
    }
  
    void Update(signed NewFirstUncoveredArg, const Expr *StrExpr) {
      assert(NewFirstUncoveredArg >= 0 && "Outside range");
  
      // Don't update if a previous string covers all arguments.
      if (FirstUncoveredArg == AllCovered)
        return;
  
      // UncoveredArgHandler tracks the highest uncovered argument index
      // and with it all the strings that match this index.
      if (NewFirstUncoveredArg == FirstUncoveredArg)
        DiagnosticExprs.push_back(StrExpr);
      else if (NewFirstUncoveredArg > FirstUncoveredArg) {
        DiagnosticExprs.clear();
        DiagnosticExprs.push_back(StrExpr);
        FirstUncoveredArg = NewFirstUncoveredArg;
      }
    }
  
    void Diagnose(Sema &S, bool IsFunctionCall, const Expr *ArgExpr);
  };
  
  enum StringLiteralCheckType {
    SLCT_NotALiteral,
    SLCT_UncheckedLiteral,
    SLCT_CheckedLiteral
  };
  
  } // namespace
  
  static void sumOffsets(llvm::APSInt &Offset, llvm::APSInt Addend,
                                       BinaryOperatorKind BinOpKind,
                                       bool AddendIsRight) {
    unsigned BitWidth = Offset.getBitWidth();
    unsigned AddendBitWidth = Addend.getBitWidth();
    // There might be negative interim results.
    if (Addend.isUnsigned()) {
      Addend = Addend.zext(++AddendBitWidth);
      Addend.setIsSigned(true);
    }
    // Adjust the bit width of the APSInts.
    if (AddendBitWidth > BitWidth) {
      Offset = Offset.sext(AddendBitWidth);
      BitWidth = AddendBitWidth;
    } else if (BitWidth > AddendBitWidth) {
      Addend = Addend.sext(BitWidth);
    }
  
    bool Ov = false;
    llvm::APSInt ResOffset = Offset;
    if (BinOpKind == BO_Add)
      ResOffset = Offset.sadd_ov(Addend, Ov);
    else {
      assert(AddendIsRight && BinOpKind == BO_Sub &&
             "operator must be add or sub with addend on the right");
      ResOffset = Offset.ssub_ov(Addend, Ov);
    }
  
    // We add an offset to a pointer here so we should support an offset as big as
    // possible.
    if (Ov) {
      assert(BitWidth <= std::numeric_limits<unsigned>::max() / 2 &&
             "index (intermediate) result too big");
      Offset = Offset.sext(2 * BitWidth);
      sumOffsets(Offset, Addend, BinOpKind, AddendIsRight);
      return;
    }
  
    Offset = ResOffset;
  }
  
  namespace {
  
  // This is a wrapper class around StringLiteral to support offsetted string
  // literals as format strings. It takes the offset into account when returning
  // the string and its length or the source locations to display notes correctly.
  class FormatStringLiteral {
    const StringLiteral *FExpr;
    int64_t Offset;
  
   public:
    FormatStringLiteral(const StringLiteral *fexpr, int64_t Offset = 0)
        : FExpr(fexpr), Offset(Offset) {}
  
    StringRef getString() const {
      return FExpr->getString().drop_front(Offset);
    }
  
    unsigned getByteLength() const {
      return FExpr->getByteLength() - getCharByteWidth() * Offset;
    }
  
    unsigned getLength() const { return FExpr->getLength() - Offset; }
    unsigned getCharByteWidth() const { return FExpr->getCharByteWidth(); }
  
    StringLiteral::StringKind getKind() const { return FExpr->getKind(); }
  
    QualType getType() const { return FExpr->getType(); }
  
    bool isAscii() const { return FExpr->isAscii(); }
    bool isWide() const { return FExpr->isWide(); }
    bool isUTF8() const { return FExpr->isUTF8(); }
    bool isUTF16() const { return FExpr->isUTF16(); }
    bool isUTF32() const { return FExpr->isUTF32(); }
    bool isPascal() const { return FExpr->isPascal(); }
  
    SourceLocation getLocationOfByte(
        unsigned ByteNo, const SourceManager &SM, const LangOptions &Features,
        const TargetInfo &Target, unsigned *StartToken = nullptr,
        unsigned *StartTokenByteOffset = nullptr) const {
      return FExpr->getLocationOfByte(ByteNo + Offset, SM, Features, Target,
                                      StartToken, StartTokenByteOffset);
    }
  
    SourceLocation getBeginLoc() const LLVM_READONLY {
      return FExpr->getBeginLoc().getLocWithOffset(Offset);
    }
  
    SourceLocation getEndLoc() const LLVM_READONLY { return FExpr->getEndLoc(); }
  };
  
  }  // namespace
  
  static void CheckFormatString(Sema &S, const FormatStringLiteral *FExpr,
                                const Expr *OrigFormatExpr,
                                ArrayRef<const Expr *> Args,
                                bool HasVAListArg, unsigned format_idx,
                                unsigned firstDataArg,
                                Sema::FormatStringType Type,
                                bool inFunctionCall,
                                Sema::VariadicCallType CallType,
                                llvm::SmallBitVector &CheckedVarArgs,
                                UncoveredArgHandler &UncoveredArg,
                                bool IgnoreStringsWithoutSpecifiers);
  
  // Determine if an expression is a string literal or constant string.
  // If this function returns false on the arguments to a function expecting a
  // format string, we will usually need to emit a warning.
  // True string literals are then checked by CheckFormatString.
  static StringLiteralCheckType
  checkFormatStringExpr(Sema &S, const Expr *E, ArrayRef<const Expr *> Args,
                        bool HasVAListArg, unsigned format_idx,
                        unsigned firstDataArg, Sema::FormatStringType Type,
                        Sema::VariadicCallType CallType, bool InFunctionCall,
                        llvm::SmallBitVector &CheckedVarArgs,
                        UncoveredArgHandler &UncoveredArg,
                        llvm::APSInt Offset,
                        bool IgnoreStringsWithoutSpecifiers = false) {
    if (S.isConstantEvaluated())
      return SLCT_NotALiteral;
   tryAgain:
    assert(Offset.isSigned() && "invalid offset");
  
    if (E->isTypeDependent() || E->isValueDependent())
      return SLCT_NotALiteral;
  
    E = E->IgnoreParenCasts();
  
    if (E->isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull))
      // Technically -Wformat-nonliteral does not warn about this case.
      // The behavior of printf and friends in this case is implementation
      // dependent.  Ideally if the format string cannot be null then
      // it should have a 'nonnull' attribute in the function prototype.
      return SLCT_UncheckedLiteral;
  
    switch (E->getStmtClass()) {
    case Stmt::BinaryConditionalOperatorClass:
    case Stmt::ConditionalOperatorClass: {
      // The expression is a literal if both sub-expressions were, and it was
      // completely checked only if both sub-expressions were checked.
      const AbstractConditionalOperator *C =
          cast<AbstractConditionalOperator>(E);
  
      // Determine whether it is necessary to check both sub-expressions, for
      // example, because the condition expression is a constant that can be
      // evaluated at compile time.
      bool CheckLeft = true, CheckRight = true;
  
      bool Cond;
      if (C->getCond()->EvaluateAsBooleanCondition(Cond, S.getASTContext(),
                                                   S.isConstantEvaluated())) {
        if (Cond)
          CheckRight = false;
        else
          CheckLeft = false;
      }
  
      // We need to maintain the offsets for the right and the left hand side
      // separately to check if every possible indexed expression is a valid
      // string literal. They might have different offsets for different string
      // literals in the end.
      StringLiteralCheckType Left;
      if (!CheckLeft)
        Left = SLCT_UncheckedLiteral;
      else {
        Left = checkFormatStringExpr(S, C->getTrueExpr(), Args,
                                     HasVAListArg, format_idx, firstDataArg,
                                     Type, CallType, InFunctionCall,
                                     CheckedVarArgs, UncoveredArg, Offset,
                                     IgnoreStringsWithoutSpecifiers);
        if (Left == SLCT_NotALiteral || !CheckRight) {
          return Left;
        }
      }
  
      StringLiteralCheckType Right = checkFormatStringExpr(
          S, C->getFalseExpr(), Args, HasVAListArg, format_idx, firstDataArg,
          Type, CallType, InFunctionCall, CheckedVarArgs, UncoveredArg, Offset,
          IgnoreStringsWithoutSpecifiers);
  
      return (CheckLeft && Left < Right) ? Left : Right;
    }
  
    case Stmt::ImplicitCastExprClass:
      E = cast<ImplicitCastExpr>(E)->getSubExpr();
      goto tryAgain;
  
    case Stmt::OpaqueValueExprClass:
      if (const Expr *src = cast<OpaqueValueExpr>(E)->getSourceExpr()) {
        E = src;
        goto tryAgain;
      }
      return SLCT_NotALiteral;
  
    case Stmt::PredefinedExprClass:
      // While __func__, etc., are technically not string literals, they
      // cannot contain format specifiers and thus are not a security
      // liability.
      return SLCT_UncheckedLiteral;
  
    case Stmt::DeclRefExprClass: {
      const DeclRefExpr *DR = cast<DeclRefExpr>(E);
  
      // As an exception, do not flag errors for variables binding to
      // const string literals.
      if (const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl())) {
        bool isConstant = false;
        QualType T = DR->getType();
  
        if (const ArrayType *AT = S.Context.getAsArrayType(T)) {
          isConstant = AT->getElementType().isConstant(S.Context);
        } else if (const PointerType *PT = T->getAs<PointerType>()) {
          isConstant = T.isConstant(S.Context) &&
                       PT->getPointeeType().isConstant(S.Context);
        } else if (T->isObjCObjectPointerType()) {
          // In ObjC, there is usually no "const ObjectPointer" type,
          // so don't check if the pointee type is constant.
          isConstant = T.isConstant(S.Context);
        }
  
        if (isConstant) {
          if (const Expr *Init = VD->getAnyInitializer()) {
            // Look through initializers like const char c[] = { "foo" }
            if (const InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) {
              if (InitList->isStringLiteralInit())
                Init = InitList->getInit(0)->IgnoreParenImpCasts();
            }
            return checkFormatStringExpr(S, Init, Args,
                                         HasVAListArg, format_idx,
                                         firstDataArg, Type, CallType,
                                         /*InFunctionCall*/ false, CheckedVarArgs,
                                         UncoveredArg, Offset);
          }
        }
  
        // For vprintf* functions (i.e., HasVAListArg==true), we add a
        // special check to see if the format string is a function parameter
        // of the function calling the printf function.  If the function
        // has an attribute indicating it is a printf-like function, then we
        // should suppress warnings concerning non-literals being used in a call
        // to a vprintf function.  For example:
        //
        // void
        // logmessage(char const *fmt __attribute__ (format (printf, 1, 2)), ...){
        //      va_list ap;
        //      va_start(ap, fmt);
        //      vprintf(fmt, ap);  // Do NOT emit a warning about "fmt".
        //      ...
        // }
        if (HasVAListArg) {
          if (const ParmVarDecl *PV = dyn_cast<ParmVarDecl>(VD)) {
            if (const NamedDecl *ND = dyn_cast<NamedDecl>(PV->getDeclContext())) {
              int PVIndex = PV->getFunctionScopeIndex() + 1;
              for (const auto *PVFormat : ND->specific_attrs<FormatAttr>()) {
                // adjust for implicit parameter
                if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND))
                  if (MD->isInstance())
                    ++PVIndex;
                // We also check if the formats are compatible.
                // We can't pass a 'scanf' string to a 'printf' function.
                if (PVIndex == PVFormat->getFormatIdx() &&
                    Type == S.GetFormatStringType(PVFormat))
                  return SLCT_UncheckedLiteral;
              }
            }
          }
        }
      }
  
      return SLCT_NotALiteral;
    }
  
    case Stmt::CallExprClass:
    case Stmt::CXXMemberCallExprClass: {
      const CallExpr *CE = cast<CallExpr>(E);
      if (const NamedDecl *ND = dyn_cast_or_null<NamedDecl>(CE->getCalleeDecl())) {
        bool IsFirst = true;
        StringLiteralCheckType CommonResult;
        for (const auto *FA : ND->specific_attrs<FormatArgAttr>()) {
          const Expr *Arg = CE->getArg(FA->getFormatIdx().getASTIndex());
          StringLiteralCheckType Result = checkFormatStringExpr(
              S, Arg, Args, HasVAListArg, format_idx, firstDataArg, Type,
              CallType, InFunctionCall, CheckedVarArgs, UncoveredArg, Offset,
              IgnoreStringsWithoutSpecifiers);
          if (IsFirst) {
            CommonResult = Result;
            IsFirst = false;
          }
        }
        if (!IsFirst)
          return CommonResult;
  
        if (const auto *FD = dyn_cast<FunctionDecl>(ND)) {
          unsigned BuiltinID = FD->getBuiltinID();
          if (BuiltinID == Builtin::BI__builtin___CFStringMakeConstantString ||
              BuiltinID == Builtin::BI__builtin___NSStringMakeConstantString) {
            const Expr *Arg = CE->getArg(0);
            return checkFormatStringExpr(S, Arg, Args,
                                         HasVAListArg, format_idx,
                                         firstDataArg, Type, CallType,
                                         InFunctionCall, CheckedVarArgs,
                                         UncoveredArg, Offset,
                                         IgnoreStringsWithoutSpecifiers);
          }
        }
      }
  
      return SLCT_NotALiteral;
    }
    case Stmt::ObjCMessageExprClass: {
      const auto *ME = cast<ObjCMessageExpr>(E);
      if (const auto *MD = ME->getMethodDecl()) {
        if (const auto *FA = MD->getAttr<FormatArgAttr>()) {
          // As a special case heuristic, if we're using the method -[NSBundle
          // localizedStringForKey:value:table:], ignore any key strings that lack
          // format specifiers. The idea is that if the key doesn't have any
          // format specifiers then its probably just a key to map to the
          // localized strings. If it does have format specifiers though, then its
          // likely that the text of the key is the format string in the
          // programmer's language, and should be checked.
          const ObjCInterfaceDecl *IFace;
          if (MD->isInstanceMethod() && (IFace = MD->getClassInterface()) &&
              IFace->getIdentifier()->isStr("NSBundle") &&
              MD->getSelector().isKeywordSelector(
                  {"localizedStringForKey", "value", "table"})) {
            IgnoreStringsWithoutSpecifiers = true;
          }
  
          const Expr *Arg = ME->getArg(FA->getFormatIdx().getASTIndex());
          return checkFormatStringExpr(
              S, Arg, Args, HasVAListArg, format_idx, firstDataArg, Type,
              CallType, InFunctionCall, CheckedVarArgs, UncoveredArg, Offset,
              IgnoreStringsWithoutSpecifiers);
        }
      }
  
      return SLCT_NotALiteral;
    }
    case Stmt::ObjCStringLiteralClass:
    case Stmt::StringLiteralClass: {
      const StringLiteral *StrE = nullptr;
  
      if (const ObjCStringLiteral *ObjCFExpr = dyn_cast<ObjCStringLiteral>(E))
        StrE = ObjCFExpr->getString();
      else
        StrE = cast<StringLiteral>(E);
  
      if (StrE) {
        if (Offset.isNegative() || Offset > StrE->getLength()) {
          // TODO: It would be better to have an explicit warning for out of
          // bounds literals.
          return SLCT_NotALiteral;
        }
        FormatStringLiteral FStr(StrE, Offset.sextOrTrunc(64).getSExtValue());
        CheckFormatString(S, &FStr, E, Args, HasVAListArg, format_idx,
                          firstDataArg, Type, InFunctionCall, CallType,
                          CheckedVarArgs, UncoveredArg,
                          IgnoreStringsWithoutSpecifiers);
        return SLCT_CheckedLiteral;
      }
  
      return SLCT_NotALiteral;
    }
    case Stmt::BinaryOperatorClass: {
      const BinaryOperator *BinOp = cast<BinaryOperator>(E);
  
      // A string literal + an int offset is still a string literal.
      if (BinOp->isAdditiveOp()) {
        Expr::EvalResult LResult, RResult;
  
        bool LIsInt = BinOp->getLHS()->EvaluateAsInt(
            LResult, S.Context, Expr::SE_NoSideEffects, S.isConstantEvaluated());
        bool RIsInt = BinOp->getRHS()->EvaluateAsInt(
            RResult, S.Context, Expr::SE_NoSideEffects, S.isConstantEvaluated());
  
        if (LIsInt != RIsInt) {
          BinaryOperatorKind BinOpKind = BinOp->getOpcode();
  
          if (LIsInt) {
            if (BinOpKind == BO_Add) {
              sumOffsets(Offset, LResult.Val.getInt(), BinOpKind, RIsInt);
              E = BinOp->getRHS();
              goto tryAgain;
            }
          } else {
            sumOffsets(Offset, RResult.Val.getInt(), BinOpKind, RIsInt);
            E = BinOp->getLHS();
            goto tryAgain;
          }
        }
      }
  
      return SLCT_NotALiteral;
    }
    case Stmt::UnaryOperatorClass: {
      const UnaryOperator *UnaOp = cast<UnaryOperator>(E);
      auto ASE = dyn_cast<ArraySubscriptExpr>(UnaOp->getSubExpr());
      if (UnaOp->getOpcode() == UO_AddrOf && ASE) {
        Expr::EvalResult IndexResult;
        if (ASE->getRHS()->EvaluateAsInt(IndexResult, S.Context,
                                         Expr::SE_NoSideEffects,
                                         S.isConstantEvaluated())) {
          sumOffsets(Offset, IndexResult.Val.getInt(), BO_Add,
                     /*RHS is int*/ true);
          E = ASE->getBase();
          goto tryAgain;
        }
      }
  
      return SLCT_NotALiteral;
    }
  
    default:
      return SLCT_NotALiteral;
    }
  }
  
  Sema::FormatStringType Sema::GetFormatStringType(const FormatAttr *Format) {
    return llvm::StringSwitch<FormatStringType>(Format->getType()->getName())
        .Case("scanf", FST_Scanf)
        .Cases("printf", "printf0", FST_Printf)
        .Cases("NSString", "CFString", FST_NSString)
        .Case("strftime", FST_Strftime)
        .Case("strfmon", FST_Strfmon)
        .Cases("kprintf", "cmn_err", "vcmn_err", "zcmn_err", FST_Kprintf)
        .Case("freebsd_kprintf", FST_FreeBSDKPrintf)
        .Case("os_trace", FST_OSLog)
        .Case("os_log", FST_OSLog)
        .Default(FST_Unknown);
  }
  
  /// CheckFormatArguments - Check calls to printf and scanf (and similar
  /// functions) for correct use of format strings.
  /// Returns true if a format string has been fully checked.
  bool Sema::CheckFormatArguments(const FormatAttr *Format,
                                  ArrayRef<const Expr *> Args,
                                  bool IsCXXMember,
                                  VariadicCallType CallType,
                                  SourceLocation Loc, SourceRange Range,
                                  llvm::SmallBitVector &CheckedVarArgs) {
    FormatStringInfo FSI;
    if (getFormatStringInfo(Format, IsCXXMember, &FSI))
      return CheckFormatArguments(Args, FSI.HasVAListArg, FSI.FormatIdx,
                                  FSI.FirstDataArg, GetFormatStringType(Format),
                                  CallType, Loc, Range, CheckedVarArgs);
    return false;
  }
  
  bool Sema::CheckFormatArguments(ArrayRef<const Expr *> Args,
                                  bool HasVAListArg, unsigned format_idx,
                                  unsigned firstDataArg, FormatStringType Type,
                                  VariadicCallType CallType,
                                  SourceLocation Loc, SourceRange Range,
                                  llvm::SmallBitVector &CheckedVarArgs) {
    // CHECK: printf/scanf-like function is called with no format string.
    if (format_idx >= Args.size()) {
      Diag(Loc, diag::warn_missing_format_string) << Range;
      return false;
    }
  
    const Expr *OrigFormatExpr = Args[format_idx]->IgnoreParenCasts();
  
    // CHECK: format string is not a string literal.
    //
    // Dynamically generated format strings are difficult to
    // automatically vet at compile time.  Requiring that format strings
    // are string literals: (1) permits the checking of format strings by
    // the compiler and thereby (2) can practically remove the source of
    // many format string exploits.
  
    // Format string can be either ObjC string (e.g. @"%d") or
    // C string (e.g. "%d")
    // ObjC string uses the same format specifiers as C string, so we can use
    // the same format string checking logic for both ObjC and C strings.
    UncoveredArgHandler UncoveredArg;
    StringLiteralCheckType CT =
        checkFormatStringExpr(*this, OrigFormatExpr, Args, HasVAListArg,
                              format_idx, firstDataArg, Type, CallType,
                              /*IsFunctionCall*/ true, CheckedVarArgs,
                              UncoveredArg,
                              /*no string offset*/ llvm::APSInt(64, false) = 0);
  
    // Generate a diagnostic where an uncovered argument is detected.
    if (UncoveredArg.hasUncoveredArg()) {
      unsigned ArgIdx = UncoveredArg.getUncoveredArg() + firstDataArg;
      assert(ArgIdx < Args.size() && "ArgIdx outside bounds");
      UncoveredArg.Diagnose(*this, /*IsFunctionCall*/true, Args[ArgIdx]);
    }
  
    if (CT != SLCT_NotALiteral)
      // Literal format string found, check done!
      return CT == SLCT_CheckedLiteral;
  
    // Strftime is particular as it always uses a single 'time' argument,
    // so it is safe to pass a non-literal string.
    if (Type == FST_Strftime)
      return false;
  
    // Do not emit diag when the string param is a macro expansion and the
    // format is either NSString or CFString. This is a hack to prevent
    // diag when using the NSLocalizedString and CFCopyLocalizedString macros
    // which are usually used in place of NS and CF string literals.
    SourceLocation FormatLoc = Args[format_idx]->getBeginLoc();
    if (Type == FST_NSString && SourceMgr.isInSystemMacro(FormatLoc))
      return false;
  
    // If there are no arguments specified, warn with -Wformat-security, otherwise
    // warn only with -Wformat-nonliteral.
    if (Args.size() == firstDataArg) {
      Diag(FormatLoc, diag::warn_format_nonliteral_noargs)
        << OrigFormatExpr->getSourceRange();
      switch (Type) {
      default:
        break;
      case FST_Kprintf:
      case FST_FreeBSDKPrintf:
      case FST_Printf:
        Diag(FormatLoc, diag::note_format_security_fixit)
          << FixItHint::CreateInsertion(FormatLoc, "\"%s\", ");
        break;
      case FST_NSString:
        Diag(FormatLoc, diag::note_format_security_fixit)
          << FixItHint::CreateInsertion(FormatLoc, "@\"%@\", ");
        break;
      }
    } else {
      Diag(FormatLoc, diag::warn_format_nonliteral)
        << OrigFormatExpr->getSourceRange();
    }
    return false;
  }
  
  namespace {
  
  class CheckFormatHandler : public analyze_format_string::FormatStringHandler {
  protected:
    Sema &S;
    const FormatStringLiteral *FExpr;
    const Expr *OrigFormatExpr;
    const Sema::FormatStringType FSType;
    const unsigned FirstDataArg;
    const unsigned NumDataArgs;
    const char *Beg; // Start of format string.
    const bool HasVAListArg;
    ArrayRef<const Expr *> Args;
    unsigned FormatIdx;
    llvm::SmallBitVector CoveredArgs;
    bool usesPositionalArgs = false;
    bool atFirstArg = true;
    bool inFunctionCall;
    Sema::VariadicCallType CallType;
    llvm::SmallBitVector &CheckedVarArgs;
    UncoveredArgHandler &UncoveredArg;
  
  public:
    CheckFormatHandler(Sema &s, const FormatStringLiteral *fexpr,
                       const Expr *origFormatExpr,
                       const Sema::FormatStringType type, unsigned firstDataArg,
                       unsigned numDataArgs, const char *beg, bool hasVAListArg,
                       ArrayRef<const Expr *> Args, unsigned formatIdx,
                       bool inFunctionCall, Sema::VariadicCallType callType,
                       llvm::SmallBitVector &CheckedVarArgs,
                       UncoveredArgHandler &UncoveredArg)
        : S(s), FExpr(fexpr), OrigFormatExpr(origFormatExpr), FSType(type),
          FirstDataArg(firstDataArg), NumDataArgs(numDataArgs), Beg(beg),
          HasVAListArg(hasVAListArg), Args(Args), FormatIdx(formatIdx),
          inFunctionCall(inFunctionCall), CallType(callType),
          CheckedVarArgs(CheckedVarArgs), UncoveredArg(UncoveredArg) {
      CoveredArgs.resize(numDataArgs);
      CoveredArgs.reset();
    }
  
    void DoneProcessing();
  
    void HandleIncompleteSpecifier(const char *startSpecifier,
                                   unsigned specifierLen) override;
  
    void HandleInvalidLengthModifier(
                             const analyze_format_string::FormatSpecifier &FS,
                             const analyze_format_string::ConversionSpecifier &CS,
                             const char *startSpecifier, unsigned specifierLen,
                             unsigned DiagID);
  
    void HandleNonStandardLengthModifier(
                      const analyze_format_string::FormatSpecifier &FS,
                      const char *startSpecifier, unsigned specifierLen);
  
    void HandleNonStandardConversionSpecifier(
                      const analyze_format_string::ConversionSpecifier &CS,
                      const char *startSpecifier, unsigned specifierLen);
  
    void HandlePosition(const char *startPos, unsigned posLen) override;
  
    void HandleInvalidPosition(const char *startSpecifier,
                               unsigned specifierLen,
                               analyze_format_string::PositionContext p) override;
  
    void HandleZeroPosition(const char *startPos, unsigned posLen) override;
  
    void HandleNullChar(const char *nullCharacter) override;
  
    template <typename Range>
    static void
    EmitFormatDiagnostic(Sema &S, bool inFunctionCall, const Expr *ArgumentExpr,
                         const PartialDiagnostic &PDiag, SourceLocation StringLoc,
                         bool IsStringLocation, Range StringRange,
                         ArrayRef<FixItHint> Fixit = None);
  
  protected:
    bool HandleInvalidConversionSpecifier(unsigned argIndex, SourceLocation Loc,
                                          const char *startSpec,
                                          unsigned specifierLen,
                                          const char *csStart, unsigned csLen);
  
    void HandlePositionalNonpositionalArgs(SourceLocation Loc,
                                           const char *startSpec,
                                           unsigned specifierLen);
  
    SourceRange getFormatStringRange();
    CharSourceRange getSpecifierRange(const char *startSpecifier,
                                      unsigned specifierLen);
    SourceLocation getLocationOfByte(const char *x);
  
    const Expr *getDataArg(unsigned i) const;
  
    bool CheckNumArgs(const analyze_format_string::FormatSpecifier &FS,
                      const analyze_format_string::ConversionSpecifier &CS,
                      const char *startSpecifier, unsigned specifierLen,
                      unsigned argIndex);
  
    template <typename Range>
    void EmitFormatDiagnostic(PartialDiagnostic PDiag, SourceLocation StringLoc,
                              bool IsStringLocation, Range StringRange,
                              ArrayRef<FixItHint> Fixit = None);
  };
  
  } // namespace
  
  SourceRange CheckFormatHandler::getFormatStringRange() {
    return OrigFormatExpr->getSourceRange();
  }
  
  CharSourceRange CheckFormatHandler::
  getSpecifierRange(const char *startSpecifier, unsigned specifierLen) {
    SourceLocation Start = getLocationOfByte(startSpecifier);
    SourceLocation End   = getLocationOfByte(startSpecifier + specifierLen - 1);
  
    // Advance the end SourceLocation by one due to half-open ranges.
    End = End.getLocWithOffset(1);
  
    return CharSourceRange::getCharRange(Start, End);
  }
  
  SourceLocation CheckFormatHandler::getLocationOfByte(const char *x) {
    return FExpr->getLocationOfByte(x - Beg, S.getSourceManager(),
                                    S.getLangOpts(), S.Context.getTargetInfo());
  }
  
  void CheckFormatHandler::HandleIncompleteSpecifier(const char *startSpecifier,
                                                     unsigned specifierLen){
    EmitFormatDiagnostic(S.PDiag(diag::warn_printf_incomplete_specifier),
                         getLocationOfByte(startSpecifier),
                         /*IsStringLocation*/true,
                         getSpecifierRange(startSpecifier, specifierLen));
  }
  
  void CheckFormatHandler::HandleInvalidLengthModifier(
      const analyze_format_string::FormatSpecifier &FS,
      const analyze_format_string::ConversionSpecifier &CS,
      const char *startSpecifier, unsigned specifierLen, unsigned DiagID) {
    using namespace analyze_format_string;
  
    const LengthModifier &LM = FS.getLengthModifier();
    CharSourceRange LMRange = getSpecifierRange(LM.getStart(), LM.getLength());
  
    // See if we know how to fix this length modifier.
    Optional<LengthModifier> FixedLM = FS.getCorrectedLengthModifier();
    if (FixedLM) {
      EmitFormatDiagnostic(S.PDiag(DiagID) << LM.toString() << CS.toString(),
                           getLocationOfByte(LM.getStart()),
                           /*IsStringLocation*/true,
                           getSpecifierRange(startSpecifier, specifierLen));
  
      S.Diag(getLocationOfByte(LM.getStart()), diag::note_format_fix_specifier)
        << FixedLM->toString()
        << FixItHint::CreateReplacement(LMRange, FixedLM->toString());
  
    } else {
      FixItHint Hint;
      if (DiagID == diag::warn_format_nonsensical_length)
        Hint = FixItHint::CreateRemoval(LMRange);
  
      EmitFormatDiagnostic(S.PDiag(DiagID) << LM.toString() << CS.toString(),
                           getLocationOfByte(LM.getStart()),
                           /*IsStringLocation*/true,
                           getSpecifierRange(startSpecifier, specifierLen),
                           Hint);
    }
  }
  
  void CheckFormatHandler::HandleNonStandardLengthModifier(
      const analyze_format_string::FormatSpecifier &FS,
      const char *startSpecifier, unsigned specifierLen) {
    using namespace analyze_format_string;
  
    const LengthModifier &LM = FS.getLengthModifier();
    CharSourceRange LMRange = getSpecifierRange(LM.getStart(), LM.getLength());
  
    // See if we know how to fix this length modifier.
    Optional<LengthModifier> FixedLM = FS.getCorrectedLengthModifier();
    if (FixedLM) {
      EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
                             << LM.toString() << 0,
                           getLocationOfByte(LM.getStart()),
                           /*IsStringLocation*/true,
                           getSpecifierRange(startSpecifier, specifierLen));
  
      S.Diag(getLocationOfByte(LM.getStart()), diag::note_format_fix_specifier)
        << FixedLM->toString()
        << FixItHint::CreateReplacement(LMRange, FixedLM->toString());
  
    } else {
      EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
                             << LM.toString() << 0,
                           getLocationOfByte(LM.getStart()),
                           /*IsStringLocation*/true,
                           getSpecifierRange(startSpecifier, specifierLen));
    }
  }
  
  void CheckFormatHandler::HandleNonStandardConversionSpecifier(
      const analyze_format_string::ConversionSpecifier &CS,
      const char *startSpecifier, unsigned specifierLen) {
    using namespace analyze_format_string;
  
    // See if we know how to fix this conversion specifier.
    Optional<ConversionSpecifier> FixedCS = CS.getStandardSpecifier();
    if (FixedCS) {
      EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
                            << CS.toString() << /*conversion specifier*/1,
                           getLocationOfByte(CS.getStart()),
                           /*IsStringLocation*/true,
                           getSpecifierRange(startSpecifier, specifierLen));
  
      CharSourceRange CSRange = getSpecifierRange(CS.getStart(), CS.getLength());
      S.Diag(getLocationOfByte(CS.getStart()), diag::note_format_fix_specifier)
        << FixedCS->toString()
        << FixItHint::CreateReplacement(CSRange, FixedCS->toString());
    } else {
      EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
                            << CS.toString() << /*conversion specifier*/1,
                           getLocationOfByte(CS.getStart()),
                           /*IsStringLocation*/true,
                           getSpecifierRange(startSpecifier, specifierLen));
    }
  }
  
  void CheckFormatHandler::HandlePosition(const char *startPos,
                                          unsigned posLen) {
    EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard_positional_arg),
                                 getLocationOfByte(startPos),
                                 /*IsStringLocation*/true,
                                 getSpecifierRange(startPos, posLen));
  }
  
  void
  CheckFormatHandler::HandleInvalidPosition(const char *startPos, unsigned posLen,
                                       analyze_format_string::PositionContext p) {
    EmitFormatDiagnostic(S.PDiag(diag::warn_format_invalid_positional_specifier)
                           << (unsigned) p,
                         getLocationOfByte(startPos), /*IsStringLocation*/true,
                         getSpecifierRange(startPos, posLen));
  }
  
  void CheckFormatHandler::HandleZeroPosition(const char *startPos,
                                              unsigned posLen) {
    EmitFormatDiagnostic(S.PDiag(diag::warn_format_zero_positional_specifier),
                                 getLocationOfByte(startPos),
                                 /*IsStringLocation*/true,
                                 getSpecifierRange(startPos, posLen));
  }
  
  void CheckFormatHandler::HandleNullChar(const char *nullCharacter) {
    if (!isa<ObjCStringLiteral>(OrigFormatExpr)) {
      // The presence of a null character is likely an error.
      EmitFormatDiagnostic(
        S.PDiag(diag::warn_printf_format_string_contains_null_char),
        getLocationOfByte(nullCharacter), /*IsStringLocation*/true,
        getFormatStringRange());
    }
  }
  
  // Note that this may return NULL if there was an error parsing or building
  // one of the argument expressions.
  const Expr *CheckFormatHandler::getDataArg(unsigned i) const {
    return Args[FirstDataArg + i];
  }
  
  void CheckFormatHandler::DoneProcessing() {
    // Does the number of data arguments exceed the number of
    // format conversions in the format string?
    if (!HasVAListArg) {
        // Find any arguments that weren't covered.
      CoveredArgs.flip();
      signed notCoveredArg = CoveredArgs.find_first();
      if (notCoveredArg >= 0) {
        assert((unsigned)notCoveredArg < NumDataArgs);
        UncoveredArg.Update(notCoveredArg, OrigFormatExpr);
      } else {
        UncoveredArg.setAllCovered();
      }
    }
  }
  
  void UncoveredArgHandler::Diagnose(Sema &S, bool IsFunctionCall,
                                     const Expr *ArgExpr) {
    assert(hasUncoveredArg() && DiagnosticExprs.size() > 0 &&
           "Invalid state");
  
    if (!ArgExpr)
      return;
  
    SourceLocation Loc = ArgExpr->getBeginLoc();
  
    if (S.getSourceManager().isInSystemMacro(Loc))
      return;
  
    PartialDiagnostic PDiag = S.PDiag(diag::warn_printf_data_arg_not_used);
    for (auto E : DiagnosticExprs)
      PDiag << E->getSourceRange();
  
    CheckFormatHandler::EmitFormatDiagnostic(
                                    S, IsFunctionCall, DiagnosticExprs[0],
                                    PDiag, Loc, /*IsStringLocation*/false,
                                    DiagnosticExprs[0]->getSourceRange());
  }
  
  bool
  CheckFormatHandler::HandleInvalidConversionSpecifier(unsigned argIndex,
                                                       SourceLocation Loc,
                                                       const char *startSpec,
                                                       unsigned specifierLen,
                                                       const char *csStart,
                                                       unsigned csLen) {
    bool keepGoing = true;
    if (argIndex < NumDataArgs) {
      // Consider the argument coverered, even though the specifier doesn't
      // make sense.
      CoveredArgs.set(argIndex);
    }
    else {
      // If argIndex exceeds the number of data arguments we
      // don't issue a warning because that is just a cascade of warnings (and
      // they may have intended '%%' anyway). We don't want to continue processing
      // the format string after this point, however, as we will like just get
      // gibberish when trying to match arguments.
      keepGoing = false;
    }
  
    StringRef Specifier(csStart, csLen);
  
    // If the specifier in non-printable, it could be the first byte of a UTF-8
    // sequence. In that case, print the UTF-8 code point. If not, print the byte
    // hex value.
    std::string CodePointStr;
    if (!llvm::sys::locale::isPrint(*csStart)) {
      llvm::UTF32 CodePoint;
      const llvm::UTF8 **B = reinterpret_cast<const llvm::UTF8 **>(&csStart);
      const llvm::UTF8 *E =
          reinterpret_cast<const llvm::UTF8 *>(csStart + csLen);
      llvm::ConversionResult Result =
          llvm::convertUTF8Sequence(B, E, &CodePoint, llvm::strictConversion);
  
      if (Result != llvm::conversionOK) {
        unsigned char FirstChar = *csStart;
        CodePoint = (llvm::UTF32)FirstChar;
      }
  
      llvm::raw_string_ostream OS(CodePointStr);
      if (CodePoint < 256)
        OS << "\\x" << llvm::format("%02x", CodePoint);
      else if (CodePoint <= 0xFFFF)
        OS << "\\u" << llvm::format("%04x", CodePoint);
      else
        OS << "\\U" << llvm::format("%08x", CodePoint);
      OS.flush();
      Specifier = CodePointStr;
    }
  
    EmitFormatDiagnostic(
        S.PDiag(diag::warn_format_invalid_conversion) << Specifier, Loc,
        /*IsStringLocation*/ true, getSpecifierRange(startSpec, specifierLen));
  
    return keepGoing;
  }
  
  void
  CheckFormatHandler::HandlePositionalNonpositionalArgs(SourceLocation Loc,
                                                        const char *startSpec,
                                                        unsigned specifierLen) {
    EmitFormatDiagnostic(
      S.PDiag(diag::warn_format_mix_positional_nonpositional_args),
      Loc, /*isStringLoc*/true, getSpecifierRange(startSpec, specifierLen));
  }
  
  bool
  CheckFormatHandler::CheckNumArgs(
    const analyze_format_string::FormatSpecifier &FS,
    const analyze_format_string::ConversionSpecifier &CS,
    const char *startSpecifier, unsigned specifierLen, unsigned argIndex) {
  
    if (argIndex >= NumDataArgs) {
      PartialDiagnostic PDiag = FS.usesPositionalArg()
        ? (S.PDiag(diag::warn_printf_positional_arg_exceeds_data_args)
             << (argIndex+1) << NumDataArgs)
        : S.PDiag(diag::warn_printf_insufficient_data_args);
      EmitFormatDiagnostic(
        PDiag, getLocationOfByte(CS.getStart()), /*IsStringLocation*/true,
        getSpecifierRange(startSpecifier, specifierLen));
  
      // Since more arguments than conversion tokens are given, by extension
      // all arguments are covered, so mark this as so.
      UncoveredArg.setAllCovered();
      return false;
    }
    return true;
  }
  
  template<typename Range>
  void CheckFormatHandler::EmitFormatDiagnostic(PartialDiagnostic PDiag,
                                                SourceLocation Loc,
                                                bool IsStringLocation,
                                                Range StringRange,
                                                ArrayRef<FixItHint> FixIt) {
    EmitFormatDiagnostic(S, inFunctionCall, Args[FormatIdx], PDiag,
                         Loc, IsStringLocation, StringRange, FixIt);
  }
  
  /// If the format string is not within the function call, emit a note
  /// so that the function call and string are in diagnostic messages.
  ///
  /// \param InFunctionCall if true, the format string is within the function
  /// call and only one diagnostic message will be produced.  Otherwise, an
  /// extra note will be emitted pointing to location of the format string.
  ///
  /// \param ArgumentExpr the expression that is passed as the format string
  /// argument in the function call.  Used for getting locations when two
  /// diagnostics are emitted.
  ///
  /// \param PDiag the callee should already have provided any strings for the
  /// diagnostic message.  This function only adds locations and fixits
  /// to diagnostics.
  ///
  /// \param Loc primary location for diagnostic.  If two diagnostics are
  /// required, one will be at Loc and a new SourceLocation will be created for
  /// the other one.
  ///
  /// \param IsStringLocation if true, Loc points to the format string should be
  /// used for the note.  Otherwise, Loc points to the argument list and will
  /// be used with PDiag.
  ///
  /// \param StringRange some or all of the string to highlight.  This is
  /// templated so it can accept either a CharSourceRange or a SourceRange.
  ///
  /// \param FixIt optional fix it hint for the format string.
  template <typename Range>
  void CheckFormatHandler::EmitFormatDiagnostic(
      Sema &S, bool InFunctionCall, const Expr *ArgumentExpr,
      const PartialDiagnostic &PDiag, SourceLocation Loc, bool IsStringLocation,
      Range StringRange, ArrayRef<FixItHint> FixIt) {
    if (InFunctionCall) {
      const Sema::SemaDiagnosticBuilder &D = S.Diag(Loc, PDiag);
      D << StringRange;
      D << FixIt;
    } else {
      S.Diag(IsStringLocation ? ArgumentExpr->getExprLoc() : Loc, PDiag)
        << ArgumentExpr->getSourceRange();
  
      const Sema::SemaDiagnosticBuilder &Note =
        S.Diag(IsStringLocation ? Loc : StringRange.getBegin(),
               diag::note_format_string_defined);
  
      Note << StringRange;
      Note << FixIt;
    }
  }
  
  //===--- CHECK: Printf format string checking ------------------------------===//
  
  namespace {
  
  class CheckPrintfHandler : public CheckFormatHandler {
  public:
    CheckPrintfHandler(Sema &s, const FormatStringLiteral *fexpr,
                       const Expr *origFormatExpr,
                       const Sema::FormatStringType type, unsigned firstDataArg,
                       unsigned numDataArgs, bool isObjC, const char *beg,
                       bool hasVAListArg, ArrayRef<const Expr *> Args,
                       unsigned formatIdx, bool inFunctionCall,
                       Sema::VariadicCallType CallType,
                       llvm::SmallBitVector &CheckedVarArgs,
                       UncoveredArgHandler &UncoveredArg)
        : CheckFormatHandler(s, fexpr, origFormatExpr, type, firstDataArg,
                             numDataArgs, beg, hasVAListArg, Args, formatIdx,
                             inFunctionCall, CallType, CheckedVarArgs,
                             UncoveredArg) {}
  
    bool isObjCContext() const { return FSType == Sema::FST_NSString; }
  
    /// Returns true if '%@' specifiers are allowed in the format string.
    bool allowsObjCArg() const {
      return FSType == Sema::FST_NSString || FSType == Sema::FST_OSLog ||
             FSType == Sema::FST_OSTrace;
    }
  
    bool HandleInvalidPrintfConversionSpecifier(
                                        const analyze_printf::PrintfSpecifier &FS,
                                        const char *startSpecifier,
                                        unsigned specifierLen) override;
  
    void handleInvalidMaskType(StringRef MaskType) override;
  
    bool HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier &FS,
                               const char *startSpecifier,
                               unsigned specifierLen) override;
    bool checkFormatExpr(const analyze_printf::PrintfSpecifier &FS,
                         const char *StartSpecifier,
                         unsigned SpecifierLen,
                         const Expr *E);
  
    bool HandleAmount(const analyze_format_string::OptionalAmount &Amt, unsigned k,
                      const char *startSpecifier, unsigned specifierLen);
    void HandleInvalidAmount(const analyze_printf::PrintfSpecifier &FS,
                             const analyze_printf::OptionalAmount &Amt,
                             unsigned type,
                             const char *startSpecifier, unsigned specifierLen);
    void HandleFlag(const analyze_printf::PrintfSpecifier &FS,
                    const analyze_printf::OptionalFlag &flag,
                    const char *startSpecifier, unsigned specifierLen);
    void HandleIgnoredFlag(const analyze_printf::PrintfSpecifier &FS,
                           const analyze_printf::OptionalFlag &ignoredFlag,
                           const analyze_printf::OptionalFlag &flag,
                           const char *startSpecifier, unsigned specifierLen);
    bool checkForCStrMembers(const analyze_printf::ArgType &AT,
                             const Expr *E);
  
    void HandleEmptyObjCModifierFlag(const char *startFlag,
                                     unsigned flagLen) override;
  
    void HandleInvalidObjCModifierFlag(const char *startFlag,
                                              unsigned flagLen) override;
  
    void HandleObjCFlagsWithNonObjCConversion(const char *flagsStart,
                                             const char *flagsEnd,
                                             const char *conversionPosition)
                                               override;
  };
  
  } // namespace
  
  bool CheckPrintfHandler::HandleInvalidPrintfConversionSpecifier(
                                        const analyze_printf::PrintfSpecifier &FS,
                                        const char *startSpecifier,
                                        unsigned specifierLen) {
    const analyze_printf::PrintfConversionSpecifier &CS =
      FS.getConversionSpecifier();
  
    return HandleInvalidConversionSpecifier(FS.getArgIndex(),
                                            getLocationOfByte(CS.getStart()),
                                            startSpecifier, specifierLen,
                                            CS.getStart(), CS.getLength());
  }
  
  void CheckPrintfHandler::handleInvalidMaskType(StringRef MaskType) {
    S.Diag(getLocationOfByte(MaskType.data()), diag::err_invalid_mask_type_size);
  }
  
  bool CheckPrintfHandler::HandleAmount(
                                 const analyze_format_string::OptionalAmount &Amt,
                                 unsigned k, const char *startSpecifier,
                                 unsigned specifierLen) {
    if (Amt.hasDataArgument()) {
      if (!HasVAListArg) {
        unsigned argIndex = Amt.getArgIndex();
        if (argIndex >= NumDataArgs) {
          EmitFormatDiagnostic(S.PDiag(diag::warn_printf_asterisk_missing_arg)
                                 << k,
                               getLocationOfByte(Amt.getStart()),
                               /*IsStringLocation*/true,
                               getSpecifierRange(startSpecifier, specifierLen));
          // Don't do any more checking.  We will just emit
          // spurious errors.
          return false;
        }
  
        // Type check the data argument.  It should be an 'int'.
        // Although not in conformance with C99, we also allow the argument to be
        // an 'unsigned int' as that is a reasonably safe case.  GCC also
        // doesn't emit a warning for that case.
        CoveredArgs.set(argIndex);
        const Expr *Arg = getDataArg(argIndex);
        if (!Arg)
          return false;
  
        QualType T = Arg->getType();
  
        const analyze_printf::ArgType &AT = Amt.getArgType(S.Context);
        assert(AT.isValid());
  
        if (!AT.matchesType(S.Context, T)) {
          EmitFormatDiagnostic(S.PDiag(diag::warn_printf_asterisk_wrong_type)
                                 << k << AT.getRepresentativeTypeName(S.Context)
                                 << T << Arg->getSourceRange(),
                               getLocationOfByte(Amt.getStart()),
                               /*IsStringLocation*/true,
                               getSpecifierRange(startSpecifier, specifierLen));
          // Don't do any more checking.  We will just emit
          // spurious errors.
          return false;
        }
      }
    }
    return true;
  }
  
  void CheckPrintfHandler::HandleInvalidAmount(
                                        const analyze_printf::PrintfSpecifier &FS,
                                        const analyze_printf::OptionalAmount &Amt,
                                        unsigned type,
                                        const char *startSpecifier,
                                        unsigned specifierLen) {
    const analyze_printf::PrintfConversionSpecifier &CS =
      FS.getConversionSpecifier();
  
    FixItHint fixit =
      Amt.getHowSpecified() == analyze_printf::OptionalAmount::Constant
        ? FixItHint::CreateRemoval(getSpecifierRange(Amt.getStart(),
                                   Amt.getConstantLength()))
        : FixItHint();
  
    EmitFormatDiagnostic(S.PDiag(diag::warn_printf_nonsensical_optional_amount)
                           << type << CS.toString(),
                         getLocationOfByte(Amt.getStart()),
                         /*IsStringLocation*/true,
                         getSpecifierRange(startSpecifier, specifierLen),
                         fixit);
  }
  
  void CheckPrintfHandler::HandleFlag(const analyze_printf::PrintfSpecifier &FS,
                                      const analyze_printf::OptionalFlag &flag,
                                      const char *startSpecifier,
                                      unsigned specifierLen) {
    // Warn about pointless flag with a fixit removal.
    const analyze_printf::PrintfConversionSpecifier &CS =
      FS.getConversionSpecifier();
    EmitFormatDiagnostic(S.PDiag(diag::warn_printf_nonsensical_flag)
                           << flag.toString() << CS.toString(),
                         getLocationOfByte(flag.getPosition()),
                         /*IsStringLocation*/true,
                         getSpecifierRange(startSpecifier, specifierLen),
                         FixItHint::CreateRemoval(
                           getSpecifierRange(flag.getPosition(), 1)));
  }
  
  void CheckPrintfHandler::HandleIgnoredFlag(
                                  const analyze_printf::PrintfSpecifier &FS,
                                  const analyze_printf::OptionalFlag &ignoredFlag,
                                  const analyze_printf::OptionalFlag &flag,
                                  const char *startSpecifier,
                                  unsigned specifierLen) {
    // Warn about ignored flag with a fixit removal.
    EmitFormatDiagnostic(S.PDiag(diag::warn_printf_ignored_flag)
                           << ignoredFlag.toString() << flag.toString(),
                         getLocationOfByte(ignoredFlag.getPosition()),
                         /*IsStringLocation*/true,
                         getSpecifierRange(startSpecifier, specifierLen),
                         FixItHint::CreateRemoval(
                           getSpecifierRange(ignoredFlag.getPosition(), 1)));
  }
  
  void CheckPrintfHandler::HandleEmptyObjCModifierFlag(const char *startFlag,
                                                       unsigned flagLen) {
    // Warn about an empty flag.
    EmitFormatDiagnostic(S.PDiag(diag::warn_printf_empty_objc_flag),
                         getLocationOfByte(startFlag),
                         /*IsStringLocation*/true,
                         getSpecifierRange(startFlag, flagLen));
  }
  
  void CheckPrintfHandler::HandleInvalidObjCModifierFlag(const char *startFlag,
                                                         unsigned flagLen) {
    // Warn about an invalid flag.
    auto Range = getSpecifierRange(startFlag, flagLen);
    StringRef flag(startFlag, flagLen);
    EmitFormatDiagnostic(S.PDiag(diag::warn_printf_invalid_objc_flag) << flag,
                        getLocationOfByte(startFlag),
                        /*IsStringLocation*/true,
                        Range, FixItHint::CreateRemoval(Range));
  }
  
  void CheckPrintfHandler::HandleObjCFlagsWithNonObjCConversion(
      const char *flagsStart, const char *flagsEnd, const char *conversionPosition) {
      // Warn about using '[...]' without a '@' conversion.
      auto Range = getSpecifierRange(flagsStart, flagsEnd - flagsStart + 1);
      auto diag = diag::warn_printf_ObjCflags_without_ObjCConversion;
      EmitFormatDiagnostic(S.PDiag(diag) << StringRef(conversionPosition, 1),
                           getLocationOfByte(conversionPosition),
                           /*IsStringLocation*/true,
                           Range, FixItHint::CreateRemoval(Range));
  }
  
  // Determines if the specified is a C++ class or struct containing
  // a member with the specified name and kind (e.g. a CXXMethodDecl named
  // "c_str()").
  template<typename MemberKind>
  static llvm::SmallPtrSet<MemberKind*, 1>
  CXXRecordMembersNamed(StringRef Name, Sema &S, QualType Ty) {
    const RecordType *RT = Ty->getAs<RecordType>();
    llvm::SmallPtrSet<MemberKind*, 1> Results;
  
    if (!RT)
      return Results;
    const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl());
    if (!RD || !RD->getDefinition())
      return Results;
  
    LookupResult R(S, &S.Context.Idents.get(Name), SourceLocation(),
                   Sema::LookupMemberName);
    R.suppressDiagnostics();
  
    // We just need to include all members of the right kind turned up by the
    // filter, at this point.
    if (S.LookupQualifiedName(R, RT->getDecl()))
      for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
        NamedDecl *decl = (*I)->getUnderlyingDecl();
        if (MemberKind *FK = dyn_cast<MemberKind>(decl))
          Results.insert(FK);
      }
    return Results;
  }
  
  /// Check if we could call '.c_str()' on an object.
  ///
  /// FIXME: This returns the wrong results in some cases (if cv-qualifiers don't
  /// allow the call, or if it would be ambiguous).
  bool Sema::hasCStrMethod(const Expr *E) {
    using MethodSet = llvm::SmallPtrSet<CXXMethodDecl *, 1>;
  
    MethodSet Results =
        CXXRecordMembersNamed<CXXMethodDecl>("c_str", *this, E->getType());
    for (MethodSet::iterator MI = Results.begin(), ME = Results.end();
         MI != ME; ++MI)
      if ((*MI)->getMinRequiredArguments() == 0)
        return true;
    return false;
  }
  
  // Check if a (w)string was passed when a (w)char* was needed, and offer a
  // better diagnostic if so. AT is assumed to be valid.
  // Returns true when a c_str() conversion method is found.
  bool CheckPrintfHandler::checkForCStrMembers(
      const analyze_printf::ArgType &AT, const Expr *E) {
    using MethodSet = llvm::SmallPtrSet<CXXMethodDecl *, 1>;
  
    MethodSet Results =
        CXXRecordMembersNamed<CXXMethodDecl>("c_str", S, E->getType());
  
    for (MethodSet::iterator MI = Results.begin(), ME = Results.end();
         MI != ME; ++MI) {
      const CXXMethodDecl *Method = *MI;
      if (Method->getMinRequiredArguments() == 0 &&
          AT.matchesType(S.Context, Method->getReturnType())) {
        // FIXME: Suggest parens if the expression needs them.
        SourceLocation EndLoc = S.getLocForEndOfToken(E->getEndLoc());
        S.Diag(E->getBeginLoc(), diag::note_printf_c_str)
            << "c_str()" << FixItHint::CreateInsertion(EndLoc, ".c_str()");
        return true;
      }
    }
  
    return false;
  }
  
  bool
  CheckPrintfHandler::HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier
                                              &FS,
                                            const char *startSpecifier,
                                            unsigned specifierLen) {
    using namespace analyze_format_string;
    using namespace analyze_printf;
  
    const PrintfConversionSpecifier &CS = FS.getConversionSpecifier();
  
    if (FS.consumesDataArgument()) {
      if (atFirstArg) {
          atFirstArg = false;
          usesPositionalArgs = FS.usesPositionalArg();
      }
      else if (usesPositionalArgs != FS.usesPositionalArg()) {
        HandlePositionalNonpositionalArgs(getLocationOfByte(CS.getStart()),
                                          startSpecifier, specifierLen);
        return false;
      }
    }
  
    // First check if the field width, precision, and conversion specifier
    // have matching data arguments.
    if (!HandleAmount(FS.getFieldWidth(), /* field width */ 0,
                      startSpecifier, specifierLen)) {
      return false;
    }
  
    if (!HandleAmount(FS.getPrecision(), /* precision */ 1,
                      startSpecifier, specifierLen)) {
      return false;
    }
  
    if (!CS.consumesDataArgument()) {
      // FIXME: Technically specifying a precision or field width here
      // makes no sense.  Worth issuing a warning at some point.
      return true;
    }
  
    // Consume the argument.
    unsigned argIndex = FS.getArgIndex();
    if (argIndex < NumDataArgs) {
      // The check to see if the argIndex is valid will come later.
      // We set the bit here because we may exit early from this
      // function if we encounter some other error.
      CoveredArgs.set(argIndex);
    }
  
    // FreeBSD kernel extensions.
    if (CS.getKind() == ConversionSpecifier::FreeBSDbArg ||
        CS.getKind() == ConversionSpecifier::FreeBSDDArg) {
      // We need at least two arguments.
      if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex + 1))
        return false;
  
      // Claim the second argument.
      CoveredArgs.set(argIndex + 1);
  
      // Type check the first argument (int for %b, pointer for %D)
      const Expr *Ex = getDataArg(argIndex);
      const analyze_printf::ArgType &AT =
        (CS.getKind() == ConversionSpecifier::FreeBSDbArg) ?
          ArgType(S.Context.IntTy) : ArgType::CPointerTy;
      if (AT.isValid() && !AT.matchesType(S.Context, Ex->getType()))
        EmitFormatDiagnostic(
            S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
                << AT.getRepresentativeTypeName(S.Context) << Ex->getType()
                << false << Ex->getSourceRange(),
            Ex->getBeginLoc(), /*IsStringLocation*/ false,
            getSpecifierRange(startSpecifier, specifierLen));
  
      // Type check the second argument (char * for both %b and %D)
      Ex = getDataArg(argIndex + 1);
      const analyze_printf::ArgType &AT2 = ArgType::CStrTy;
      if (AT2.isValid() && !AT2.matchesType(S.Context, Ex->getType()))
        EmitFormatDiagnostic(
            S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
                << AT2.getRepresentativeTypeName(S.Context) << Ex->getType()
                << false << Ex->getSourceRange(),
            Ex->getBeginLoc(), /*IsStringLocation*/ false,
            getSpecifierRange(startSpecifier, specifierLen));
  
       return true;
    }
  
    // Check for using an Objective-C specific conversion specifier
    // in a non-ObjC literal.
    if (!allowsObjCArg() && CS.isObjCArg()) {
      return HandleInvalidPrintfConversionSpecifier(FS, startSpecifier,
                                                    specifierLen);
    }
  
    // %P can only be used with os_log.
    if (FSType != Sema::FST_OSLog && CS.getKind() == ConversionSpecifier::PArg) {
      return HandleInvalidPrintfConversionSpecifier(FS, startSpecifier,
                                                    specifierLen);
    }
  
    // %n is not allowed with os_log.
    if (FSType == Sema::FST_OSLog && CS.getKind() == ConversionSpecifier::nArg) {
      EmitFormatDiagnostic(S.PDiag(diag::warn_os_log_format_narg),
                           getLocationOfByte(CS.getStart()),
                           /*IsStringLocation*/ false,
                           getSpecifierRange(startSpecifier, specifierLen));
  
      return true;
    }
  
    // Only scalars are allowed for os_trace.
    if (FSType == Sema::FST_OSTrace &&
        (CS.getKind() == ConversionSpecifier::PArg ||
         CS.getKind() == ConversionSpecifier::sArg ||
         CS.getKind() == ConversionSpecifier::ObjCObjArg)) {
      return HandleInvalidPrintfConversionSpecifier(FS, startSpecifier,
                                                    specifierLen);
    }
  
    // Check for use of public/private annotation outside of os_log().
    if (FSType != Sema::FST_OSLog) {
      if (FS.isPublic().isSet()) {
        EmitFormatDiagnostic(S.PDiag(diag::warn_format_invalid_annotation)
                                 << "public",
                             getLocationOfByte(FS.isPublic().getPosition()),
                             /*IsStringLocation*/ false,
                             getSpecifierRange(startSpecifier, specifierLen));
      }
      if (FS.isPrivate().isSet()) {
        EmitFormatDiagnostic(S.PDiag(diag::warn_format_invalid_annotation)
                                 << "private",
                             getLocationOfByte(FS.isPrivate().getPosition()),
                             /*IsStringLocation*/ false,
                             getSpecifierRange(startSpecifier, specifierLen));
      }
    }
  
    // Check for invalid use of field width
    if (!FS.hasValidFieldWidth()) {
      HandleInvalidAmount(FS, FS.getFieldWidth(), /* field width */ 0,
          startSpecifier, specifierLen);
    }
  
    // Check for invalid use of precision
    if (!FS.hasValidPrecision()) {
      HandleInvalidAmount(FS, FS.getPrecision(), /* precision */ 1,
          startSpecifier, specifierLen);
    }
  
    // Precision is mandatory for %P specifier.
    if (CS.getKind() == ConversionSpecifier::PArg &&
        FS.getPrecision().getHowSpecified() == OptionalAmount::NotSpecified) {
      EmitFormatDiagnostic(S.PDiag(diag::warn_format_P_no_precision),
                           getLocationOfByte(startSpecifier),
                           /*IsStringLocation*/ false,
                           getSpecifierRange(startSpecifier, specifierLen));
    }
  
    // Check each flag does not conflict with any other component.
    if (!FS.hasValidThousandsGroupingPrefix())
      HandleFlag(FS, FS.hasThousandsGrouping(), startSpecifier, specifierLen);
    if (!FS.hasValidLeadingZeros())
      HandleFlag(FS, FS.hasLeadingZeros(), startSpecifier, specifierLen);
    if (!FS.hasValidPlusPrefix())
      HandleFlag(FS, FS.hasPlusPrefix(), startSpecifier, specifierLen);
    if (!FS.hasValidSpacePrefix())
      HandleFlag(FS, FS.hasSpacePrefix(), startSpecifier, specifierLen);
    if (!FS.hasValidAlternativeForm())
      HandleFlag(FS, FS.hasAlternativeForm(), startSpecifier, specifierLen);
    if (!FS.hasValidLeftJustified())
      HandleFlag(FS, FS.isLeftJustified(), startSpecifier, specifierLen);
  
    // Check that flags are not ignored by another flag
    if (FS.hasSpacePrefix() && FS.hasPlusPrefix()) // ' ' ignored by '+'
      HandleIgnoredFlag(FS, FS.hasSpacePrefix(), FS.hasPlusPrefix(),
          startSpecifier, specifierLen);
    if (FS.hasLeadingZeros() && FS.isLeftJustified()) // '0' ignored by '-'
      HandleIgnoredFlag(FS, FS.hasLeadingZeros(), FS.isLeftJustified(),
              startSpecifier, specifierLen);
  
    // Check the length modifier is valid with the given conversion specifier.
    if (!FS.hasValidLengthModifier(S.getASTContext().getTargetInfo(),
                                   S.getLangOpts()))
      HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
                                  diag::warn_format_nonsensical_length);
    else if (!FS.hasStandardLengthModifier())
      HandleNonStandardLengthModifier(FS, startSpecifier, specifierLen);
    else if (!FS.hasStandardLengthConversionCombination())
      HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
                                  diag::warn_format_non_standard_conversion_spec);
  
    if (!FS.hasStandardConversionSpecifier(S.getLangOpts()))
      HandleNonStandardConversionSpecifier(CS, startSpecifier, specifierLen);
  
    // The remaining checks depend on the data arguments.
    if (HasVAListArg)
      return true;
  
    if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex))
      return false;
  
    const Expr *Arg = getDataArg(argIndex);
    if (!Arg)
      return true;
  
    return checkFormatExpr(FS, startSpecifier, specifierLen, Arg);
  }
  
  static bool requiresParensToAddCast(const Expr *E) {
    // FIXME: We should have a general way to reason about operator
    // precedence and whether parens are actually needed here.
    // Take care of a few common cases where they aren't.
    const Expr *Inside = E->IgnoreImpCasts();
    if (const PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(Inside))
      Inside = POE->getSyntacticForm()->IgnoreImpCasts();
  
    switch (Inside->getStmtClass()) {
    case Stmt::ArraySubscriptExprClass:
    case Stmt::CallExprClass:
    case Stmt::CharacterLiteralClass:
    case Stmt::CXXBoolLiteralExprClass:
    case Stmt::DeclRefExprClass:
    case Stmt::FloatingLiteralClass:
    case Stmt::IntegerLiteralClass:
    case Stmt::MemberExprClass:
    case Stmt::ObjCArrayLiteralClass:
    case Stmt::ObjCBoolLiteralExprClass:
    case Stmt::ObjCBoxedExprClass:
    case Stmt::ObjCDictionaryLiteralClass:
    case Stmt::ObjCEncodeExprClass:
    case Stmt::ObjCIvarRefExprClass:
    case Stmt::ObjCMessageExprClass:
    case Stmt::ObjCPropertyRefExprClass:
    case Stmt::ObjCStringLiteralClass:
    case Stmt::ObjCSubscriptRefExprClass:
    case Stmt::ParenExprClass:
    case Stmt::StringLiteralClass:
    case Stmt::UnaryOperatorClass:
      return false;
    default:
      return true;
    }
  }
  
  static std::pair<QualType, StringRef>
  shouldNotPrintDirectly(const ASTContext &Context,
                         QualType IntendedTy,
                         const Expr *E) {
    // Use a 'while' to peel off layers of typedefs.
    QualType TyTy = IntendedTy;
    while (const TypedefType *UserTy = TyTy->getAs<TypedefType>()) {
      StringRef Name = UserTy->getDecl()->getName();
      QualType CastTy = llvm::StringSwitch<QualType>(Name)
        .Case("CFIndex", Context.getNSIntegerType())
        .Case("NSInteger", Context.getNSIntegerType())
        .Case("NSUInteger", Context.getNSUIntegerType())
        .Case("SInt32", Context.IntTy)
        .Case("UInt32", Context.UnsignedIntTy)
        .Default(QualType());
  
      if (!CastTy.isNull())
        return std::make_pair(CastTy, Name);
  
      TyTy = UserTy->desugar();
    }
  
    // Strip parens if necessary.
    if (const ParenExpr *PE = dyn_cast<ParenExpr>(E))
      return shouldNotPrintDirectly(Context,
                                    PE->getSubExpr()->getType(),
                                    PE->getSubExpr());
  
    // If this is a conditional expression, then its result type is constructed
    // via usual arithmetic conversions and thus there might be no necessary
    // typedef sugar there.  Recurse to operands to check for NSInteger &
    // Co. usage condition.
    if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
      QualType TrueTy, FalseTy;
      StringRef TrueName, FalseName;
  
      std::tie(TrueTy, TrueName) =
        shouldNotPrintDirectly(Context,
                               CO->getTrueExpr()->getType(),
                               CO->getTrueExpr());
      std::tie(FalseTy, FalseName) =
        shouldNotPrintDirectly(Context,
                               CO->getFalseExpr()->getType(),
                               CO->getFalseExpr());
  
      if (TrueTy == FalseTy)
        return std::make_pair(TrueTy, TrueName);
      else if (TrueTy.isNull())
        return std::make_pair(FalseTy, FalseName);
      else if (FalseTy.isNull())
        return std::make_pair(TrueTy, TrueName);
    }
  
    return std::make_pair(QualType(), StringRef());
  }
  
  /// Return true if \p ICE is an implicit argument promotion of an arithmetic
  /// type. Bit-field 'promotions' from a higher ranked type to a lower ranked
  /// type do not count.
  static bool
  isArithmeticArgumentPromotion(Sema &S, const ImplicitCastExpr *ICE) {
    QualType From = ICE->getSubExpr()->getType();
    QualType To = ICE->getType();
    // It's an integer promotion if the destination type is the promoted
    // source type.
    if (ICE->getCastKind() == CK_IntegralCast &&
        From->isPromotableIntegerType() &&
        S.Context.getPromotedIntegerType(From) == To)
      return true;
    // Look through vector types, since we do default argument promotion for
    // those in OpenCL.
    if (const auto *VecTy = From->getAs<ExtVectorType>())
      From = VecTy->getElementType();
    if (const auto *VecTy = To->getAs<ExtVectorType>())
      To = VecTy->getElementType();
    // It's a floating promotion if the source type is a lower rank.
    return ICE->getCastKind() == CK_FloatingCast &&
           S.Context.getFloatingTypeOrder(From, To) < 0;
  }
  
  bool
  CheckPrintfHandler::checkFormatExpr(const analyze_printf::PrintfSpecifier &FS,
                                      const char *StartSpecifier,
                                      unsigned SpecifierLen,
                                      const Expr *E) {
    using namespace analyze_format_string;
    using namespace analyze_printf;
  
    // Now type check the data expression that matches the
    // format specifier.
    const analyze_printf::ArgType &AT = FS.getArgType(S.Context, isObjCContext());
    if (!AT.isValid())
      return true;
  
    QualType ExprTy = E->getType();
    while (const TypeOfExprType *TET = dyn_cast<TypeOfExprType>(ExprTy)) {
      ExprTy = TET->getUnderlyingExpr()->getType();
    }
  
    // Diagnose attempts to print a boolean value as a character. Unlike other
    // -Wformat diagnostics, this is fine from a type perspective, but it still
    // doesn't make sense.
    if (FS.getConversionSpecifier().getKind() == ConversionSpecifier::cArg &&
        E->isKnownToHaveBooleanValue()) {
      const CharSourceRange &CSR =
          getSpecifierRange(StartSpecifier, SpecifierLen);
      SmallString<4> FSString;
      llvm::raw_svector_ostream os(FSString);
      FS.toString(os);
      EmitFormatDiagnostic(S.PDiag(diag::warn_format_bool_as_character)
                               << FSString,
                           E->getExprLoc(), false, CSR);
      return true;
    }
  
    analyze_printf::ArgType::MatchKind Match = AT.matchesType(S.Context, ExprTy);
    if (Match == analyze_printf::ArgType::Match)
      return true;
  
    // Look through argument promotions for our error message's reported type.
    // This includes the integral and floating promotions, but excludes array
    // and function pointer decay (seeing that an argument intended to be a
    // string has type 'char [6]' is probably more confusing than 'char *') and
    // certain bitfield promotions (bitfields can be 'demoted' to a lesser type).
    if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
      if (isArithmeticArgumentPromotion(S, ICE)) {
        E = ICE->getSubExpr();
        ExprTy = E->getType();
  
        // Check if we didn't match because of an implicit cast from a 'char'
        // or 'short' to an 'int'.  This is done because printf is a varargs
        // function.
        if (ICE->getType() == S.Context.IntTy ||
            ICE->getType() == S.Context.UnsignedIntTy) {
          // All further checking is done on the subexpression
          const analyze_printf::ArgType::MatchKind ImplicitMatch =
              AT.matchesType(S.Context, ExprTy);
          if (ImplicitMatch == analyze_printf::ArgType::Match)
            return true;
          if (ImplicitMatch == ArgType::NoMatchPedantic ||
              ImplicitMatch == ArgType::NoMatchTypeConfusion)
            Match = ImplicitMatch;
        }
      }
    } else if (const CharacterLiteral *CL = dyn_cast<CharacterLiteral>(E)) {
      // Special case for 'a', which has type 'int' in C.
      // Note, however, that we do /not/ want to treat multibyte constants like
      // 'MooV' as characters! This form is deprecated but still exists.
      if (ExprTy == S.Context.IntTy)
        if (llvm::isUIntN(S.Context.getCharWidth(), CL->getValue()))
          ExprTy = S.Context.CharTy;
    }
  
    // Look through enums to their underlying type.
    bool IsEnum = false;
    if (auto EnumTy = ExprTy->getAs<EnumType>()) {
      ExprTy = EnumTy->getDecl()->getIntegerType();
      IsEnum = true;
    }
  
    // %C in an Objective-C context prints a unichar, not a wchar_t.
    // If the argument is an integer of some kind, believe the %C and suggest
    // a cast instead of changing the conversion specifier.
    QualType IntendedTy = ExprTy;
    if (isObjCContext() &&
        FS.getConversionSpecifier().getKind() == ConversionSpecifier::CArg) {
      if (ExprTy->isIntegralOrUnscopedEnumerationType() &&
          !ExprTy->isCharType()) {
        // 'unichar' is defined as a typedef of unsigned short, but we should
        // prefer using the typedef if it is visible.
        IntendedTy = S.Context.UnsignedShortTy;
  
        // While we are here, check if the value is an IntegerLiteral that happens
        // to be within the valid range.
        if (const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(E)) {
          const llvm::APInt &V = IL->getValue();
          if (V.getActiveBits() <= S.Context.getTypeSize(IntendedTy))
            return true;
        }
  
        LookupResult Result(S, &S.Context.Idents.get("unichar"), E->getBeginLoc(),
                            Sema::LookupOrdinaryName);
        if (S.LookupName(Result, S.getCurScope())) {
          NamedDecl *ND = Result.getFoundDecl();
          if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(ND))
            if (TD->getUnderlyingType() == IntendedTy)
              IntendedTy = S.Context.getTypedefType(TD);
        }
      }
    }
  
    // Special-case some of Darwin's platform-independence types by suggesting
    // casts to primitive types that are known to be large enough.
    bool ShouldNotPrintDirectly = false; StringRef CastTyName;
    if (S.Context.getTargetInfo().getTriple().isOSDarwin()) {
      QualType CastTy;
      std::tie(CastTy, CastTyName) = shouldNotPrintDirectly(S.Context, IntendedTy, E);
      if (!CastTy.isNull()) {
        // %zi/%zu and %td/%tu are OK to use for NSInteger/NSUInteger of type int
        // (long in ASTContext). Only complain to pedants.
        if ((CastTyName == "NSInteger" || CastTyName == "NSUInteger") &&
            (AT.isSizeT() || AT.isPtrdiffT()) &&
            AT.matchesType(S.Context, CastTy))
          Match = ArgType::NoMatchPedantic;
        IntendedTy = CastTy;
        ShouldNotPrintDirectly = true;
      }
    }
  
    // We may be able to offer a FixItHint if it is a supported type.
    PrintfSpecifier fixedFS = FS;
    bool Success =
        fixedFS.fixType(IntendedTy, S.getLangOpts(), S.Context, isObjCContext());
  
    if (Success) {
      // Get the fix string from the fixed format specifier
      SmallString<16> buf;
      llvm::raw_svector_ostream os(buf);
      fixedFS.toString(os);
  
      CharSourceRange SpecRange = getSpecifierRange(StartSpecifier, SpecifierLen);
  
      if (IntendedTy == ExprTy && !ShouldNotPrintDirectly) {
        unsigned Diag;
        switch (Match) {
        case ArgType::Match: llvm_unreachable("expected non-matching");
        case ArgType::NoMatchPedantic:
          Diag = diag::warn_format_conversion_argument_type_mismatch_pedantic;
          break;
        case ArgType::NoMatchTypeConfusion:
          Diag = diag::warn_format_conversion_argument_type_mismatch_confusion;
          break;
        case ArgType::NoMatch:
          Diag = diag::warn_format_conversion_argument_type_mismatch;
          break;
        }
  
        // In this case, the specifier is wrong and should be changed to match
        // the argument.
        EmitFormatDiagnostic(S.PDiag(Diag)
                                 << AT.getRepresentativeTypeName(S.Context)
                                 << IntendedTy << IsEnum << E->getSourceRange(),
                             E->getBeginLoc(),
                             /*IsStringLocation*/ false, SpecRange,
                             FixItHint::CreateReplacement(SpecRange, os.str()));
      } else {
        // The canonical type for formatting this value is different from the
        // actual type of the expression. (This occurs, for example, with Darwin's
        // NSInteger on 32-bit platforms, where it is typedef'd as 'int', but
        // should be printed as 'long' for 64-bit compatibility.)
        // Rather than emitting a normal format/argument mismatch, we want to
        // add a cast to the recommended type (and correct the format string
        // if necessary).
        SmallString<16> CastBuf;
        llvm::raw_svector_ostream CastFix(CastBuf);
        CastFix << "(";
        IntendedTy.print(CastFix, S.Context.getPrintingPolicy());
        CastFix << ")";
  
        SmallVector<FixItHint,4> Hints;
        if (!AT.matchesType(S.Context, IntendedTy) || ShouldNotPrintDirectly)
          Hints.push_back(FixItHint::CreateReplacement(SpecRange, os.str()));
  
        if (const CStyleCastExpr *CCast = dyn_cast<CStyleCastExpr>(E)) {
          // If there's already a cast present, just replace it.
          SourceRange CastRange(CCast->getLParenLoc(), CCast->getRParenLoc());
          Hints.push_back(FixItHint::CreateReplacement(CastRange, CastFix.str()));
  
        } else if (!requiresParensToAddCast(E)) {
          // If the expression has high enough precedence,
          // just write the C-style cast.
          Hints.push_back(
              FixItHint::CreateInsertion(E->getBeginLoc(), CastFix.str()));
        } else {
          // Otherwise, add parens around the expression as well as the cast.
          CastFix << "(";
          Hints.push_back(
              FixItHint::CreateInsertion(E->getBeginLoc(), CastFix.str()));
  
          SourceLocation After = S.getLocForEndOfToken(E->getEndLoc());
          Hints.push_back(FixItHint::CreateInsertion(After, ")"));
        }
  
        if (ShouldNotPrintDirectly) {
          // The expression has a type that should not be printed directly.
          // We extract the name from the typedef because we don't want to show
          // the underlying type in the diagnostic.
          StringRef Name;
          if (const TypedefType *TypedefTy = dyn_cast<TypedefType>(ExprTy))
            Name = TypedefTy->getDecl()->getName();
          else
            Name = CastTyName;
          unsigned Diag = Match == ArgType::NoMatchPedantic
                              ? diag::warn_format_argument_needs_cast_pedantic
                              : diag::warn_format_argument_needs_cast;
          EmitFormatDiagnostic(S.PDiag(Diag) << Name << IntendedTy << IsEnum
                                             << E->getSourceRange(),
                               E->getBeginLoc(), /*IsStringLocation=*/false,
                               SpecRange, Hints);
        } else {
          // In this case, the expression could be printed using a different
          // specifier, but we've decided that the specifier is probably correct
          // and we should cast instead. Just use the normal warning message.
          EmitFormatDiagnostic(
              S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
                  << AT.getRepresentativeTypeName(S.Context) << ExprTy << IsEnum
                  << E->getSourceRange(),
              E->getBeginLoc(), /*IsStringLocation*/ false, SpecRange, Hints);
        }
      }
    } else {
      const CharSourceRange &CSR = getSpecifierRange(StartSpecifier,
                                                     SpecifierLen);
      // Since the warning for passing non-POD types to variadic functions
      // was deferred until now, we emit a warning for non-POD
      // arguments here.
      switch (S.isValidVarArgType(ExprTy)) {
      case Sema::VAK_Valid:
      case Sema::VAK_ValidInCXX11: {
        unsigned Diag;
        switch (Match) {
        case ArgType::Match: llvm_unreachable("expected non-matching");
        case ArgType::NoMatchPedantic:
          Diag = diag::warn_format_conversion_argument_type_mismatch_pedantic;
          break;
        case ArgType::NoMatchTypeConfusion:
          Diag = diag::warn_format_conversion_argument_type_mismatch_confusion;
          break;
        case ArgType::NoMatch:
          Diag = diag::warn_format_conversion_argument_type_mismatch;
          break;
        }
  
        EmitFormatDiagnostic(
            S.PDiag(Diag) << AT.getRepresentativeTypeName(S.Context) << ExprTy
                          << IsEnum << CSR << E->getSourceRange(),
            E->getBeginLoc(), /*IsStringLocation*/ false, CSR);
        break;
      }
      case Sema::VAK_Undefined:
      case Sema::VAK_MSVCUndefined:
        EmitFormatDiagnostic(S.PDiag(diag::warn_non_pod_vararg_with_format_string)
                                 << S.getLangOpts().CPlusPlus11 << ExprTy
                                 << CallType
                                 << AT.getRepresentativeTypeName(S.Context) << CSR
                                 << E->getSourceRange(),
                             E->getBeginLoc(), /*IsStringLocation*/ false, CSR);
        checkForCStrMembers(AT, E);
        break;
  
      case Sema::VAK_Invalid:
        if (ExprTy->isObjCObjectType())
          EmitFormatDiagnostic(
              S.PDiag(diag::err_cannot_pass_objc_interface_to_vararg_format)
                  << S.getLangOpts().CPlusPlus11 << ExprTy << CallType
                  << AT.getRepresentativeTypeName(S.Context) << CSR
                  << E->getSourceRange(),
              E->getBeginLoc(), /*IsStringLocation*/ false, CSR);
        else
          // FIXME: If this is an initializer list, suggest removing the braces
          // or inserting a cast to the target type.
          S.Diag(E->getBeginLoc(), diag::err_cannot_pass_to_vararg_format)
              << isa<InitListExpr>(E) << ExprTy << CallType
              << AT.getRepresentativeTypeName(S.Context) << E->getSourceRange();
        break;
      }
  
      assert(FirstDataArg + FS.getArgIndex() < CheckedVarArgs.size() &&
             "format string specifier index out of range");
      CheckedVarArgs[FirstDataArg + FS.getArgIndex()] = true;
    }
  
    return true;
  }
  
  //===--- CHECK: Scanf format string checking ------------------------------===//
  
  namespace {
  
  class CheckScanfHandler : public CheckFormatHandler {
  public:
    CheckScanfHandler(Sema &s, const FormatStringLiteral *fexpr,
                      const Expr *origFormatExpr, Sema::FormatStringType type,
                      unsigned firstDataArg, unsigned numDataArgs,
                      const char *beg, bool hasVAListArg,
                      ArrayRef<const Expr *> Args, unsigned formatIdx,
                      bool inFunctionCall, Sema::VariadicCallType CallType,
                      llvm::SmallBitVector &CheckedVarArgs,
                      UncoveredArgHandler &UncoveredArg)
        : CheckFormatHandler(s, fexpr, origFormatExpr, type, firstDataArg,
                             numDataArgs, beg, hasVAListArg, Args, formatIdx,
                             inFunctionCall, CallType, CheckedVarArgs,
                             UncoveredArg) {}
  
    bool HandleScanfSpecifier(const analyze_scanf::ScanfSpecifier &FS,
                              const char *startSpecifier,
                              unsigned specifierLen) override;
  
    bool HandleInvalidScanfConversionSpecifier(
            const analyze_scanf::ScanfSpecifier &FS,
            const char *startSpecifier,
            unsigned specifierLen) override;
  
    void HandleIncompleteScanList(const char *start, const char *end) override;
  };
  
  } // namespace
  
  void CheckScanfHandler::HandleIncompleteScanList(const char *start,
                                                   const char *end) {
    EmitFormatDiagnostic(S.PDiag(diag::warn_scanf_scanlist_incomplete),
                         getLocationOfByte(end), /*IsStringLocation*/true,
                         getSpecifierRange(start, end - start));
  }
  
  bool CheckScanfHandler::HandleInvalidScanfConversionSpecifier(
                                          const analyze_scanf::ScanfSpecifier &FS,
                                          const char *startSpecifier,
                                          unsigned specifierLen) {
    const analyze_scanf::ScanfConversionSpecifier &CS =
      FS.getConversionSpecifier();
  
    return HandleInvalidConversionSpecifier(FS.getArgIndex(),
                                            getLocationOfByte(CS.getStart()),
                                            startSpecifier, specifierLen,
                                            CS.getStart(), CS.getLength());
  }
  
  bool CheckScanfHandler::HandleScanfSpecifier(
                                         const analyze_scanf::ScanfSpecifier &FS,
                                         const char *startSpecifier,
                                         unsigned specifierLen) {
    using namespace analyze_scanf;
    using namespace analyze_format_string;
  
    const ScanfConversionSpecifier &CS = FS.getConversionSpecifier();
  
    // Handle case where '%' and '*' don't consume an argument.  These shouldn't
    // be used to decide if we are using positional arguments consistently.
    if (FS.consumesDataArgument()) {
      if (atFirstArg) {
        atFirstArg = false;
        usesPositionalArgs = FS.usesPositionalArg();
      }
      else if (usesPositionalArgs != FS.usesPositionalArg()) {
        HandlePositionalNonpositionalArgs(getLocationOfByte(CS.getStart()),
                                          startSpecifier, specifierLen);
        return false;
      }
    }
  
    // Check if the field with is non-zero.
    const OptionalAmount &Amt = FS.getFieldWidth();
    if (Amt.getHowSpecified() == OptionalAmount::Constant) {
      if (Amt.getConstantAmount() == 0) {
        const CharSourceRange &R = getSpecifierRange(Amt.getStart(),
                                                     Amt.getConstantLength());
        EmitFormatDiagnostic(S.PDiag(diag::warn_scanf_nonzero_width),
                             getLocationOfByte(Amt.getStart()),
                             /*IsStringLocation*/true, R,
                             FixItHint::CreateRemoval(R));
      }
    }
  
    if (!FS.consumesDataArgument()) {
      // FIXME: Technically specifying a precision or field width here
      // makes no sense.  Worth issuing a warning at some point.
      return true;
    }
  
    // Consume the argument.
    unsigned argIndex = FS.getArgIndex();
    if (argIndex < NumDataArgs) {
        // The check to see if the argIndex is valid will come later.
        // We set the bit here because we may exit early from this
        // function if we encounter some other error.
      CoveredArgs.set(argIndex);
    }
  
    // Check the length modifier is valid with the given conversion specifier.
    if (!FS.hasValidLengthModifier(S.getASTContext().getTargetInfo(),
                                   S.getLangOpts()))
      HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
                                  diag::warn_format_nonsensical_length);
    else if (!FS.hasStandardLengthModifier())
      HandleNonStandardLengthModifier(FS, startSpecifier, specifierLen);
    else if (!FS.hasStandardLengthConversionCombination())
      HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
                                  diag::warn_format_non_standard_conversion_spec);
  
    if (!FS.hasStandardConversionSpecifier(S.getLangOpts()))
      HandleNonStandardConversionSpecifier(CS, startSpecifier, specifierLen);
  
    // The remaining checks depend on the data arguments.
    if (HasVAListArg)
      return true;
  
    if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex))
      return false;
  
    // Check that the argument type matches the format specifier.
    const Expr *Ex = getDataArg(argIndex);
    if (!Ex)
      return true;
  
    const analyze_format_string::ArgType &AT = FS.getArgType(S.Context);
  
    if (!AT.isValid()) {
      return true;
    }
  
    analyze_format_string::ArgType::MatchKind Match =
        AT.matchesType(S.Context, Ex->getType());
    bool Pedantic = Match == analyze_format_string::ArgType::NoMatchPedantic;
    if (Match == analyze_format_string::ArgType::Match)
      return true;
  
    ScanfSpecifier fixedFS = FS;
    bool Success = fixedFS.fixType(Ex->getType(), Ex->IgnoreImpCasts()->getType(),
                                   S.getLangOpts(), S.Context);
  
    unsigned Diag =
        Pedantic ? diag::warn_format_conversion_argument_type_mismatch_pedantic
                 : diag::warn_format_conversion_argument_type_mismatch;
  
    if (Success) {
      // Get the fix string from the fixed format specifier.
      SmallString<128> buf;
      llvm::raw_svector_ostream os(buf);
      fixedFS.toString(os);
  
      EmitFormatDiagnostic(
          S.PDiag(Diag) << AT.getRepresentativeTypeName(S.Context)
                        << Ex->getType() << false << Ex->getSourceRange(),
          Ex->getBeginLoc(),
          /*IsStringLocation*/ false,
          getSpecifierRange(startSpecifier, specifierLen),
          FixItHint::CreateReplacement(
              getSpecifierRange(startSpecifier, specifierLen), os.str()));
    } else {
      EmitFormatDiagnostic(S.PDiag(Diag)
                               << AT.getRepresentativeTypeName(S.Context)
                               << Ex->getType() << false << Ex->getSourceRange(),
                           Ex->getBeginLoc(),
                           /*IsStringLocation*/ false,
                           getSpecifierRange(startSpecifier, specifierLen));
    }
  
    return true;
  }
  
  static void CheckFormatString(Sema &S, const FormatStringLiteral *FExpr,
                                const Expr *OrigFormatExpr,
                                ArrayRef<const Expr *> Args,
                                bool HasVAListArg, unsigned format_idx,
                                unsigned firstDataArg,
                                Sema::FormatStringType Type,
                                bool inFunctionCall,
                                Sema::VariadicCallType CallType,
                                llvm::SmallBitVector &CheckedVarArgs,
                                UncoveredArgHandler &UncoveredArg,
                                bool IgnoreStringsWithoutSpecifiers) {
    // CHECK: is the format string a wide literal?
    if (!FExpr->isAscii() && !FExpr->isUTF8()) {
      CheckFormatHandler::EmitFormatDiagnostic(
          S, inFunctionCall, Args[format_idx],
          S.PDiag(diag::warn_format_string_is_wide_literal), FExpr->getBeginLoc(),
          /*IsStringLocation*/ true, OrigFormatExpr->getSourceRange());
      return;
    }
  
    // Str - The format string.  NOTE: this is NOT null-terminated!
    StringRef StrRef = FExpr->getString();
    const char *Str = StrRef.data();
    // Account for cases where the string literal is truncated in a declaration.
    const ConstantArrayType *T =
      S.Context.getAsConstantArrayType(FExpr->getType());
    assert(T && "String literal not of constant array type!");
    size_t TypeSize = T->getSize().getZExtValue();
    size_t StrLen = std::min(std::max(TypeSize, size_t(1)) - 1, StrRef.size());
    const unsigned numDataArgs = Args.size() - firstDataArg;
  
    if (IgnoreStringsWithoutSpecifiers &&
        !analyze_format_string::parseFormatStringHasFormattingSpecifiers(
            Str, Str + StrLen, S.getLangOpts(), S.Context.getTargetInfo()))
      return;
  
    // Emit a warning if the string literal is truncated and does not contain an
    // embedded null character.
    if (TypeSize <= StrRef.size() &&
        StrRef.substr(0, TypeSize).find('\0') == StringRef::npos) {
      CheckFormatHandler::EmitFormatDiagnostic(
          S, inFunctionCall, Args[format_idx],
          S.PDiag(diag::warn_printf_format_string_not_null_terminated),
          FExpr->getBeginLoc(),
          /*IsStringLocation=*/true, OrigFormatExpr->getSourceRange());
      return;
    }
  
    // CHECK: empty format string?
    if (StrLen == 0 && numDataArgs > 0) {
      CheckFormatHandler::EmitFormatDiagnostic(
          S, inFunctionCall, Args[format_idx],
          S.PDiag(diag::warn_empty_format_string), FExpr->getBeginLoc(),
          /*IsStringLocation*/ true, OrigFormatExpr->getSourceRange());
      return;
    }
  
    if (Type == Sema::FST_Printf || Type == Sema::FST_NSString ||
        Type == Sema::FST_FreeBSDKPrintf || Type == Sema::FST_OSLog ||
        Type == Sema::FST_OSTrace) {
      CheckPrintfHandler H(
          S, FExpr, OrigFormatExpr, Type, firstDataArg, numDataArgs,
          (Type == Sema::FST_NSString || Type == Sema::FST_OSTrace), Str,
          HasVAListArg, Args, format_idx, inFunctionCall, CallType,
          CheckedVarArgs, UncoveredArg);
  
      if (!analyze_format_string::ParsePrintfString(H, Str, Str + StrLen,
                                                    S.getLangOpts(),
                                                    S.Context.getTargetInfo(),
                                              Type == Sema::FST_FreeBSDKPrintf))
        H.DoneProcessing();
    } else if (Type == Sema::FST_Scanf) {
      CheckScanfHandler H(S, FExpr, OrigFormatExpr, Type, firstDataArg,
                          numDataArgs, Str, HasVAListArg, Args, format_idx,
                          inFunctionCall, CallType, CheckedVarArgs, UncoveredArg);
  
      if (!analyze_format_string::ParseScanfString(H, Str, Str + StrLen,
                                                   S.getLangOpts(),
                                                   S.Context.getTargetInfo()))
        H.DoneProcessing();
    } // TODO: handle other formats
  }
  
  bool Sema::FormatStringHasSArg(const StringLiteral *FExpr) {
    // Str - The format string.  NOTE: this is NOT null-terminated!
    StringRef StrRef = FExpr->getString();
    const char *Str = StrRef.data();
    // Account for cases where the string literal is truncated in a declaration.
    const ConstantArrayType *T = Context.getAsConstantArrayType(FExpr->getType());
    assert(T && "String literal not of constant array type!");
    size_t TypeSize = T->getSize().getZExtValue();
    size_t StrLen = std::min(std::max(TypeSize, size_t(1)) - 1, StrRef.size());
    return analyze_format_string::ParseFormatStringHasSArg(Str, Str + StrLen,
                                                           getLangOpts(),
                                                           Context.getTargetInfo());
  }
  
  //===--- CHECK: Warn on use of wrong absolute value function. -------------===//
  
  // Returns the related absolute value function that is larger, of 0 if one
  // does not exist.
  static unsigned getLargerAbsoluteValueFunction(unsigned AbsFunction) {
    switch (AbsFunction) {
    default:
      return 0;
  
    case Builtin::BI__builtin_abs:
      return Builtin::BI__builtin_labs;
    case Builtin::BI__builtin_labs:
      return Builtin::BI__builtin_llabs;
    case Builtin::BI__builtin_llabs:
      return 0;
  
    case Builtin::BI__builtin_fabsf:
      return Builtin::BI__builtin_fabs;
    case Builtin::BI__builtin_fabs:
      return Builtin::BI__builtin_fabsl;
    case Builtin::BI__builtin_fabsl:
      return 0;
  
    case Builtin::BI__builtin_cabsf:
      return Builtin::BI__builtin_cabs;
    case Builtin::BI__builtin_cabs:
      return Builtin::BI__builtin_cabsl;
    case Builtin::BI__builtin_cabsl:
      return 0;
  
    case Builtin::BIabs:
      return Builtin::BIlabs;
    case Builtin::BIlabs:
      return Builtin::BIllabs;
    case Builtin::BIllabs:
      return 0;
  
    case Builtin::BIfabsf:
      return Builtin::BIfabs;
    case Builtin::BIfabs:
      return Builtin::BIfabsl;
    case Builtin::BIfabsl:
      return 0;
  
    case Builtin::BIcabsf:
     return Builtin::BIcabs;
    case Builtin::BIcabs:
      return Builtin::BIcabsl;
    case Builtin::BIcabsl:
      return 0;
    }
  }
  
  // Returns the argument type of the absolute value function.
  static QualType getAbsoluteValueArgumentType(ASTContext &Context,
                                               unsigned AbsType) {
    if (AbsType == 0)
      return QualType();
  
    ASTContext::GetBuiltinTypeError Error = ASTContext::GE_None;
    QualType BuiltinType = Context.GetBuiltinType(AbsType, Error);
    if (Error != ASTContext::GE_None)
      return QualType();
  
    const FunctionProtoType *FT = BuiltinType->getAs<FunctionProtoType>();
    if (!FT)
      return QualType();
  
    if (FT->getNumParams() != 1)
      return QualType();
  
    return FT->getParamType(0);
  }
  
  // Returns the best absolute value function, or zero, based on type and
  // current absolute value function.
  static unsigned getBestAbsFunction(ASTContext &Context, QualType ArgType,
                                     unsigned AbsFunctionKind) {
    unsigned BestKind = 0;
    uint64_t ArgSize = Context.getTypeSize(ArgType);
    for (unsigned Kind = AbsFunctionKind; Kind != 0;
         Kind = getLargerAbsoluteValueFunction(Kind)) {
      QualType ParamType = getAbsoluteValueArgumentType(Context, Kind);
      if (Context.getTypeSize(ParamType) >= ArgSize) {
        if (BestKind == 0)
          BestKind = Kind;
        else if (Context.hasSameType(ParamType, ArgType)) {
          BestKind = Kind;
          break;
        }
      }
    }
    return BestKind;
  }
  
  enum AbsoluteValueKind {
    AVK_Integer,
    AVK_Floating,
    AVK_Complex
  };
  
  static AbsoluteValueKind getAbsoluteValueKind(QualType T) {
    if (T->isIntegralOrEnumerationType())
      return AVK_Integer;
    if (T->isRealFloatingType())
      return AVK_Floating;
    if (T->isAnyComplexType())
      return AVK_Complex;
  
    llvm_unreachable("Type not integer, floating, or complex");
  }
  
  // Changes the absolute value function to a different type.  Preserves whether
  // the function is a builtin.
  static unsigned changeAbsFunction(unsigned AbsKind,
                                    AbsoluteValueKind ValueKind) {
    switch (ValueKind) {
    case AVK_Integer:
      switch (AbsKind) {
      default:
        return 0;
      case Builtin::BI__builtin_fabsf:
      case Builtin::BI__builtin_fabs:
      case Builtin::BI__builtin_fabsl:
      case Builtin::BI__builtin_cabsf:
      case Builtin::BI__builtin_cabs:
      case Builtin::BI__builtin_cabsl:
        return Builtin::BI__builtin_abs;
      case Builtin::BIfabsf:
      case Builtin::BIfabs:
      case Builtin::BIfabsl:
      case Builtin::BIcabsf:
      case Builtin::BIcabs:
      case Builtin::BIcabsl:
        return Builtin::BIabs;
      }
    case AVK_Floating:
      switch (AbsKind) {
      default:
        return 0;
      case Builtin::BI__builtin_abs:
      case Builtin::BI__builtin_labs:
      case Builtin::BI__builtin_llabs:
      case Builtin::BI__builtin_cabsf:
      case Builtin::BI__builtin_cabs:
      case Builtin::BI__builtin_cabsl:
        return Builtin::BI__builtin_fabsf;
      case Builtin::BIabs:
      case Builtin::BIlabs:
      case Builtin::BIllabs:
      case Builtin::BIcabsf:
      case Builtin::BIcabs:
      case Builtin::BIcabsl:
        return Builtin::BIfabsf;
      }
    case AVK_Complex:
      switch (AbsKind) {
      default:
        return 0;
      case Builtin::BI__builtin_abs:
      case Builtin::BI__builtin_labs:
      case Builtin::BI__builtin_llabs:
      case Builtin::BI__builtin_fabsf:
      case Builtin::BI__builtin_fabs:
      case Builtin::BI__builtin_fabsl:
        return Builtin::BI__builtin_cabsf;
      case Builtin::BIabs:
      case Builtin::BIlabs:
      case Builtin::BIllabs:
      case Builtin::BIfabsf:
      case Builtin::BIfabs:
      case Builtin::BIfabsl:
        return Builtin::BIcabsf;
      }
    }
    llvm_unreachable("Unable to convert function");
  }
  
  static unsigned getAbsoluteValueFunctionKind(const FunctionDecl *FDecl) {
    const IdentifierInfo *FnInfo = FDecl->getIdentifier();
    if (!FnInfo)
      return 0;
  
    switch (FDecl->getBuiltinID()) {
    default:
      return 0;
    case Builtin::BI__builtin_abs:
    case Builtin::BI__builtin_fabs:
    case Builtin::BI__builtin_fabsf:
    case Builtin::BI__builtin_fabsl:
    case Builtin::BI__builtin_labs:
    case Builtin::BI__builtin_llabs:
    case Builtin::BI__builtin_cabs:
    case Builtin::BI__builtin_cabsf:
    case Builtin::BI__builtin_cabsl:
    case Builtin::BIabs:
    case Builtin::BIlabs:
    case Builtin::BIllabs:
    case Builtin::BIfabs:
    case Builtin::BIfabsf:
    case Builtin::BIfabsl:
    case Builtin::BIcabs:
    case Builtin::BIcabsf:
    case Builtin::BIcabsl:
      return FDecl->getBuiltinID();
    }
    llvm_unreachable("Unknown Builtin type");
  }
  
  // If the replacement is valid, emit a note with replacement function.
  // Additionally, suggest including the proper header if not already included.
  static void emitReplacement(Sema &S, SourceLocation Loc, SourceRange Range,
                              unsigned AbsKind, QualType ArgType) {
    bool EmitHeaderHint = true;
    const char *HeaderName = nullptr;
    const char *FunctionName = nullptr;
    if (S.getLangOpts().CPlusPlus && !ArgType->isAnyComplexType()) {
      FunctionName = "std::abs";
      if (ArgType->isIntegralOrEnumerationType()) {
        HeaderName = "cstdlib";
      } else if (ArgType->isRealFloatingType()) {
        HeaderName = "cmath";
      } else {
        llvm_unreachable("Invalid Type");
      }
  
      // Lookup all std::abs
      if (NamespaceDecl *Std = S.getStdNamespace()) {
        LookupResult R(S, &S.Context.Idents.get("abs"), Loc, Sema::LookupAnyName);
        R.suppressDiagnostics();
        S.LookupQualifiedName(R, Std);
  
        for (const auto *I : R) {
          const FunctionDecl *FDecl = nullptr;
          if (const UsingShadowDecl *UsingD = dyn_cast<UsingShadowDecl>(I)) {
            FDecl = dyn_cast<FunctionDecl>(UsingD->getTargetDecl());
          } else {
            FDecl = dyn_cast<FunctionDecl>(I);
          }
          if (!FDecl)
            continue;
  
          // Found std::abs(), check that they are the right ones.
          if (FDecl->getNumParams() != 1)
            continue;
  
          // Check that the parameter type can handle the argument.
          QualType ParamType = FDecl->getParamDecl(0)->getType();
          if (getAbsoluteValueKind(ArgType) == getAbsoluteValueKind(ParamType) &&
              S.Context.getTypeSize(ArgType) <=
                  S.Context.getTypeSize(ParamType)) {
            // Found a function, don't need the header hint.
            EmitHeaderHint = false;
            break;
          }
        }
      }
    } else {
      FunctionName = S.Context.BuiltinInfo.getName(AbsKind);
      HeaderName = S.Context.BuiltinInfo.getHeaderName(AbsKind);
  
      if (HeaderName) {
        DeclarationName DN(&S.Context.Idents.get(FunctionName));
        LookupResult R(S, DN, Loc, Sema::LookupAnyName);
        R.suppressDiagnostics();
        S.LookupName(R, S.getCurScope());
  
        if (R.isSingleResult()) {
          FunctionDecl *FD = dyn_cast<FunctionDecl>(R.getFoundDecl());
          if (FD && FD->getBuiltinID() == AbsKind) {
            EmitHeaderHint = false;
          } else {
            return;
          }
        } else if (!R.empty()) {
          return;
        }
      }
    }
  
    S.Diag(Loc, diag::note_replace_abs_function)
        << FunctionName << FixItHint::CreateReplacement(Range, FunctionName);
  
    if (!HeaderName)
      return;
  
    if (!EmitHeaderHint)
      return;
  
    S.Diag(Loc, diag::note_include_header_or_declare) << HeaderName
                                                      << FunctionName;
  }
  
  template <std::size_t StrLen>
  static bool IsStdFunction(const FunctionDecl *FDecl,
                            const char (&Str)[StrLen]) {
    if (!FDecl)
      return false;
    if (!FDecl->getIdentifier() || !FDecl->getIdentifier()->isStr(Str))
      return false;
    if (!FDecl->isInStdNamespace())
      return false;
  
    return true;
  }
  
  // Warn when using the wrong abs() function.
  void Sema::CheckAbsoluteValueFunction(const CallExpr *Call,
                                        const FunctionDecl *FDecl) {
    if (Call->getNumArgs() != 1)
      return;
  
    unsigned AbsKind = getAbsoluteValueFunctionKind(FDecl);
    bool IsStdAbs = IsStdFunction(FDecl, "abs");
    if (AbsKind == 0 && !IsStdAbs)
      return;
  
    QualType ArgType = Call->getArg(0)->IgnoreParenImpCasts()->getType();
    QualType ParamType = Call->getArg(0)->getType();
  
    // Unsigned types cannot be negative.  Suggest removing the absolute value
    // function call.
    if (ArgType->isUnsignedIntegerType()) {
      const char *FunctionName =
          IsStdAbs ? "std::abs" : Context.BuiltinInfo.getName(AbsKind);
      Diag(Call->getExprLoc(), diag::warn_unsigned_abs) << ArgType << ParamType;
      Diag(Call->getExprLoc(), diag::note_remove_abs)
          << FunctionName
          << FixItHint::CreateRemoval(Call->getCallee()->getSourceRange());
      return;
    }
  
    // Taking the absolute value of a pointer is very suspicious, they probably
    // wanted to index into an array, dereference a pointer, call a function, etc.
    if (ArgType->isPointerType() || ArgType->canDecayToPointerType()) {
      unsigned DiagType = 0;
      if (ArgType->isFunctionType())
        DiagType = 1;
      else if (ArgType->isArrayType())
        DiagType = 2;
  
      Diag(Call->getExprLoc(), diag::warn_pointer_abs) << DiagType << ArgType;
      return;
    }
  
    // std::abs has overloads which prevent most of the absolute value problems
    // from occurring.
    if (IsStdAbs)
      return;
  
    AbsoluteValueKind ArgValueKind = getAbsoluteValueKind(ArgType);
    AbsoluteValueKind ParamValueKind = getAbsoluteValueKind(ParamType);
  
    // The argument and parameter are the same kind.  Check if they are the right
    // size.
    if (ArgValueKind == ParamValueKind) {
      if (Context.getTypeSize(ArgType) <= Context.getTypeSize(ParamType))
        return;
  
      unsigned NewAbsKind = getBestAbsFunction(Context, ArgType, AbsKind);
      Diag(Call->getExprLoc(), diag::warn_abs_too_small)
          << FDecl << ArgType << ParamType;
  
      if (NewAbsKind == 0)
        return;
  
      emitReplacement(*this, Call->getExprLoc(),
                      Call->getCallee()->getSourceRange(), NewAbsKind, ArgType);
      return;
    }
  
    // ArgValueKind != ParamValueKind
    // The wrong type of absolute value function was used.  Attempt to find the
    // proper one.
    unsigned NewAbsKind = changeAbsFunction(AbsKind, ArgValueKind);
    NewAbsKind = getBestAbsFunction(Context, ArgType, NewAbsKind);
    if (NewAbsKind == 0)
      return;
  
    Diag(Call->getExprLoc(), diag::warn_wrong_absolute_value_type)
        << FDecl << ParamValueKind << ArgValueKind;
  
    emitReplacement(*this, Call->getExprLoc(),
                    Call->getCallee()->getSourceRange(), NewAbsKind, ArgType);
  }
  
  //===--- CHECK: Warn on use of std::max and unsigned zero. r---------------===//
  void Sema::CheckMaxUnsignedZero(const CallExpr *Call,
                                  const FunctionDecl *FDecl) {
    if (!Call || !FDecl) return;
  
    // Ignore template specializations and macros.
    if (inTemplateInstantiation()) return;
    if (Call->getExprLoc().isMacroID()) return;
  
    // Only care about the one template argument, two function parameter std::max
    if (Call->getNumArgs() != 2) return;
    if (!IsStdFunction(FDecl, "max")) return;
    const auto * ArgList = FDecl->getTemplateSpecializationArgs();
    if (!ArgList) return;
    if (ArgList->size() != 1) return;
  
    // Check that template type argument is unsigned integer.
    const auto& TA = ArgList->get(0);
    if (TA.getKind() != TemplateArgument::Type) return;
    QualType ArgType = TA.getAsType();
    if (!ArgType->isUnsignedIntegerType()) return;
  
    // See if either argument is a literal zero.
    auto IsLiteralZeroArg = [](const Expr* E) -> bool {
      const auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E);
      if (!MTE) return false;
      const auto *Num = dyn_cast<IntegerLiteral>(MTE->getSubExpr());
      if (!Num) return false;
      if (Num->getValue() != 0) return false;
      return true;
    };
  
    const Expr *FirstArg = Call->getArg(0);
    const Expr *SecondArg = Call->getArg(1);
    const bool IsFirstArgZero = IsLiteralZeroArg(FirstArg);
    const bool IsSecondArgZero = IsLiteralZeroArg(SecondArg);
  
    // Only warn when exactly one argument is zero.
    if (IsFirstArgZero == IsSecondArgZero) return;
  
    SourceRange FirstRange = FirstArg->getSourceRange();
    SourceRange SecondRange = SecondArg->getSourceRange();
  
    SourceRange ZeroRange = IsFirstArgZero ? FirstRange : SecondRange;
  
    Diag(Call->getExprLoc(), diag::warn_max_unsigned_zero)
        << IsFirstArgZero << Call->getCallee()->getSourceRange() << ZeroRange;
  
    // Deduce what parts to remove so that "std::max(0u, foo)" becomes "(foo)".
    SourceRange RemovalRange;
    if (IsFirstArgZero) {
      RemovalRange = SourceRange(FirstRange.getBegin(),
                                 SecondRange.getBegin().getLocWithOffset(-1));
    } else {
      RemovalRange = SourceRange(getLocForEndOfToken(FirstRange.getEnd()),
                                 SecondRange.getEnd());
    }
  
    Diag(Call->getExprLoc(), diag::note_remove_max_call)
          << FixItHint::CreateRemoval(Call->getCallee()->getSourceRange())
          << FixItHint::CreateRemoval(RemovalRange);
  }
  
  //===--- CHECK: Standard memory functions ---------------------------------===//
  
  /// Takes the expression passed to the size_t parameter of functions
  /// such as memcmp, strncat, etc and warns if it's a comparison.
  ///
  /// This is to catch typos like `if (memcmp(&a, &b, sizeof(a) > 0))`.
  static bool CheckMemorySizeofForComparison(Sema &S, const Expr *E,
                                             IdentifierInfo *FnName,
                                             SourceLocation FnLoc,
                                             SourceLocation RParenLoc) {
    const BinaryOperator *Size = dyn_cast<BinaryOperator>(E);
    if (!Size)
      return false;
  
    // if E is binop and op is <=>, >, <, >=, <=, ==, &&, ||:
    if (!Size->isComparisonOp() && !Size->isLogicalOp())
      return false;
  
    SourceRange SizeRange = Size->getSourceRange();
    S.Diag(Size->getOperatorLoc(), diag::warn_memsize_comparison)
        << SizeRange << FnName;
    S.Diag(FnLoc, diag::note_memsize_comparison_paren)
        << FnName
        << FixItHint::CreateInsertion(
               S.getLocForEndOfToken(Size->getLHS()->getEndLoc()), ")")
        << FixItHint::CreateRemoval(RParenLoc);
    S.Diag(SizeRange.getBegin(), diag::note_memsize_comparison_cast_silence)
        << FixItHint::CreateInsertion(SizeRange.getBegin(), "(size_t)(")
        << FixItHint::CreateInsertion(S.getLocForEndOfToken(SizeRange.getEnd()),
                                      ")");
  
    return true;
  }
  
  /// Determine whether the given type is or contains a dynamic class type
  /// (e.g., whether it has a vtable).
  static const CXXRecordDecl *getContainedDynamicClass(QualType T,
                                                       bool &IsContained) {
    // Look through array types while ignoring qualifiers.
    const Type *Ty = T->getBaseElementTypeUnsafe();
    IsContained = false;
  
    const CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
    RD = RD ? RD->getDefinition() : nullptr;
    if (!RD || RD->isInvalidDecl())
      return nullptr;
  
    if (RD->isDynamicClass())
      return RD;
  
    // Check all the fields.  If any bases were dynamic, the class is dynamic.
    // It's impossible for a class to transitively contain itself by value, so
    // infinite recursion is impossible.
    for (auto *FD : RD->fields()) {
      bool SubContained;
      if (const CXXRecordDecl *ContainedRD =
              getContainedDynamicClass(FD->getType(), SubContained)) {
        IsContained = true;
        return ContainedRD;
      }
    }
  
    return nullptr;
  }
  
  static const UnaryExprOrTypeTraitExpr *getAsSizeOfExpr(const Expr *E) {
    if (const auto *Unary = dyn_cast<UnaryExprOrTypeTraitExpr>(E))
      if (Unary->getKind() == UETT_SizeOf)
        return Unary;
    return nullptr;
  }
  
  /// If E is a sizeof expression, returns its argument expression,
  /// otherwise returns NULL.
  static const Expr *getSizeOfExprArg(const Expr *E) {
    if (const UnaryExprOrTypeTraitExpr *SizeOf = getAsSizeOfExpr(E))
      if (!SizeOf->isArgumentType())
        return SizeOf->getArgumentExpr()->IgnoreParenImpCasts();
    return nullptr;
  }
  
  /// If E is a sizeof expression, returns its argument type.
  static QualType getSizeOfArgType(const Expr *E) {
    if (const UnaryExprOrTypeTraitExpr *SizeOf = getAsSizeOfExpr(E))
      return SizeOf->getTypeOfArgument();
    return QualType();
  }
  
  namespace {
  
  struct SearchNonTrivialToInitializeField
      : DefaultInitializedTypeVisitor<SearchNonTrivialToInitializeField> {
    using Super =
        DefaultInitializedTypeVisitor<SearchNonTrivialToInitializeField>;
  
    SearchNonTrivialToInitializeField(const Expr *E, Sema &S) : E(E), S(S) {}
  
    void visitWithKind(QualType::PrimitiveDefaultInitializeKind PDIK, QualType FT,
                       SourceLocation SL) {
      if (const auto *AT = asDerived().getContext().getAsArrayType(FT)) {
        asDerived().visitArray(PDIK, AT, SL);
        return;
      }
  
      Super::visitWithKind(PDIK, FT, SL);
    }
  
    void visitARCStrong(QualType FT, SourceLocation SL) {
      S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 1);
    }
    void visitARCWeak(QualType FT, SourceLocation SL) {
      S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 1);
    }
    void visitStruct(QualType FT, SourceLocation SL) {
      for (const FieldDecl *FD : FT->castAs<RecordType>()->getDecl()->fields())
        visit(FD->getType(), FD->getLocation());
    }
    void visitArray(QualType::PrimitiveDefaultInitializeKind PDIK,
                    const ArrayType *AT, SourceLocation SL) {
      visit(getContext().getBaseElementType(AT), SL);
    }
    void visitTrivial(QualType FT, SourceLocation SL) {}
  
    static void diag(QualType RT, const Expr *E, Sema &S) {
      SearchNonTrivialToInitializeField(E, S).visitStruct(RT, SourceLocation());
    }
  
    ASTContext &getContext() { return S.getASTContext(); }
  
    const Expr *E;
    Sema &S;
  };
  
  struct SearchNonTrivialToCopyField
      : CopiedTypeVisitor<SearchNonTrivialToCopyField, false> {
    using Super = CopiedTypeVisitor<SearchNonTrivialToCopyField, false>;
  
    SearchNonTrivialToCopyField(const Expr *E, Sema &S) : E(E), S(S) {}
  
    void visitWithKind(QualType::PrimitiveCopyKind PCK, QualType FT,
                       SourceLocation SL) {
      if (const auto *AT = asDerived().getContext().getAsArrayType(FT)) {
        asDerived().visitArray(PCK, AT, SL);
        return;
      }
  
      Super::visitWithKind(PCK, FT, SL);
    }
  
    void visitARCStrong(QualType FT, SourceLocation SL) {
      S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 0);
    }
    void visitARCWeak(QualType FT, SourceLocation SL) {
      S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 0);
    }
    void visitPtrAuth(QualType FT, SourceLocation SL) {
      S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 0);
    }
    void visitStruct(QualType FT, SourceLocation SL) {
      for (const FieldDecl *FD : FT->castAs<RecordType>()->getDecl()->fields())
        visit(FD->getType(), FD->getLocation());
    }
    void visitArray(QualType::PrimitiveCopyKind PCK, const ArrayType *AT,
                    SourceLocation SL) {
      visit(getContext().getBaseElementType(AT), SL);
    }
    void preVisit(QualType::PrimitiveCopyKind PCK, QualType FT,
                  SourceLocation SL) {}
    void visitTrivial(QualType FT, SourceLocation SL) {}
    void visitVolatileTrivial(QualType FT, SourceLocation SL) {}
  
    static void diag(QualType RT, const Expr *E, Sema &S) {
      SearchNonTrivialToCopyField(E, S).visitStruct(RT, SourceLocation());
    }
  
    ASTContext &getContext() { return S.getASTContext(); }
  
    const Expr *E;
    Sema &S;
  };
  
  }
  
  /// Detect if \c SizeofExpr is likely to calculate the sizeof an object.
  static bool doesExprLikelyComputeSize(const Expr *SizeofExpr) {
    SizeofExpr = SizeofExpr->IgnoreParenImpCasts();
  
    if (const auto *BO = dyn_cast<BinaryOperator>(SizeofExpr)) {
      if (BO->getOpcode() != BO_Mul && BO->getOpcode() != BO_Add)
        return false;
  
      return doesExprLikelyComputeSize(BO->getLHS()) ||
             doesExprLikelyComputeSize(BO->getRHS());
    }
  
    return getAsSizeOfExpr(SizeofExpr) != nullptr;
  }
  
  /// Check if the ArgLoc originated from a macro passed to the call at CallLoc.
  ///
  /// \code
  ///   #define MACRO 0
  ///   foo(MACRO);
  ///   foo(0);
  /// \endcode
  ///
  /// This should return true for the first call to foo, but not for the second
  /// (regardless of whether foo is a macro or function).
  static bool isArgumentExpandedFromMacro(SourceManager &SM,
                                          SourceLocation CallLoc,
                                          SourceLocation ArgLoc) {
    if (!CallLoc.isMacroID())
      return SM.getFileID(CallLoc) != SM.getFileID(ArgLoc);
  
    return SM.getFileID(SM.getImmediateMacroCallerLoc(CallLoc)) !=
           SM.getFileID(SM.getImmediateMacroCallerLoc(ArgLoc));
  }
  
  /// Diagnose cases like 'memset(buf, sizeof(buf), 0)', which should have the
  /// last two arguments transposed.
  static void CheckMemaccessSize(Sema &S, unsigned BId, const CallExpr *Call) {
    if (BId != Builtin::BImemset && BId != Builtin::BIbzero)
      return;
  
    const Expr *SizeArg =
      Call->getArg(BId == Builtin::BImemset ? 2 : 1)->IgnoreImpCasts();
  
    auto isLiteralZero = [](const Expr *E) {
      return isa<IntegerLiteral>(E) && cast<IntegerLiteral>(E)->getValue() == 0;
    };
  
    // If we're memsetting or bzeroing 0 bytes, then this is likely an error.
    SourceLocation CallLoc = Call->getRParenLoc();
    SourceManager &SM = S.getSourceManager();
    if (isLiteralZero(SizeArg) &&
        !isArgumentExpandedFromMacro(SM, CallLoc, SizeArg->getExprLoc())) {
  
      SourceLocation DiagLoc = SizeArg->getExprLoc();
  
      // Some platforms #define bzero to __builtin_memset. See if this is the
      // case, and if so, emit a better diagnostic.
      if (BId == Builtin::BIbzero ||
          (CallLoc.isMacroID() && Lexer::getImmediateMacroName(
                                      CallLoc, SM, S.getLangOpts()) == "bzero")) {
        S.Diag(DiagLoc, diag::warn_suspicious_bzero_size);
        S.Diag(DiagLoc, diag::note_suspicious_bzero_size_silence);
      } else if (!isLiteralZero(Call->getArg(1)->IgnoreImpCasts())) {
        S.Diag(DiagLoc, diag::warn_suspicious_sizeof_memset) << 0;
        S.Diag(DiagLoc, diag::note_suspicious_sizeof_memset_silence) << 0;
      }
      return;
    }
  
    // If the second argument to a memset is a sizeof expression and the third
    // isn't, this is also likely an error. This should catch
    // 'memset(buf, sizeof(buf), 0xff)'.
    if (BId == Builtin::BImemset &&
        doesExprLikelyComputeSize(Call->getArg(1)) &&
        !doesExprLikelyComputeSize(Call->getArg(2))) {
      SourceLocation DiagLoc = Call->getArg(1)->getExprLoc();
      S.Diag(DiagLoc, diag::warn_suspicious_sizeof_memset) << 1;
      S.Diag(DiagLoc, diag::note_suspicious_sizeof_memset_silence) << 1;
      return;
    }
  }
  
  /// Check for dangerous or invalid arguments to memset().
  ///
  /// This issues warnings on known problematic, dangerous or unspecified
  /// arguments to the standard 'memset', 'memcpy', 'memmove', and 'memcmp'
  /// function calls.
  ///
  /// \param Call The call expression to diagnose.
  void Sema::CheckMemaccessArguments(const CallExpr *Call,
                                     unsigned BId,
                                     IdentifierInfo *FnName) {
    assert(BId != 0);
  
    // It is possible to have a non-standard definition of memset.  Validate
    // we have enough arguments, and if not, abort further checking.
    unsigned ExpectedNumArgs =
        (BId == Builtin::BIstrndup || BId == Builtin::BIbzero ? 2 : 3);
    if (Call->getNumArgs() < ExpectedNumArgs)
      return;
  
    unsigned LastArg = (BId == Builtin::BImemset || BId == Builtin::BIbzero ||
                        BId == Builtin::BIstrndup ? 1 : 2);
    unsigned LenArg =
        (BId == Builtin::BIbzero || BId == Builtin::BIstrndup ? 1 : 2);
    const Expr *LenExpr = Call->getArg(LenArg)->IgnoreParenImpCasts();
  
    if (CheckMemorySizeofForComparison(*this, LenExpr, FnName,
                                       Call->getBeginLoc(), Call->getRParenLoc()))
      return;
  
    // Catch cases like 'memset(buf, sizeof(buf), 0)'.
    CheckMemaccessSize(*this, BId, Call);
  
    // We have special checking when the length is a sizeof expression.
    QualType SizeOfArgTy = getSizeOfArgType(LenExpr);
    const Expr *SizeOfArg = getSizeOfExprArg(LenExpr);
    llvm::FoldingSetNodeID SizeOfArgID;
  
    // Although widely used, 'bzero' is not a standard function. Be more strict
    // with the argument types before allowing diagnostics and only allow the
    // form bzero(ptr, sizeof(...)).
    QualType FirstArgTy = Call->getArg(0)->IgnoreParenImpCasts()->getType();
    if (BId == Builtin::BIbzero && !FirstArgTy->getAs<PointerType>())
      return;
  
    for (unsigned ArgIdx = 0; ArgIdx != LastArg; ++ArgIdx) {
      const Expr *Dest = Call->getArg(ArgIdx)->IgnoreParenImpCasts();
      SourceRange ArgRange = Call->getArg(ArgIdx)->getSourceRange();
  
      QualType DestTy = Dest->getType();
      QualType PointeeTy;
      if (const PointerType *DestPtrTy = DestTy->getAs<PointerType>()) {
        PointeeTy = DestPtrTy->getPointeeType();
  
        // Never warn about void type pointers. This can be used to suppress
        // false positives.
        if (PointeeTy->isVoidType())
          continue;
  
        // Catch "memset(p, 0, sizeof(p))" -- needs to be sizeof(*p). Do this by
        // actually comparing the expressions for equality. Because computing the
        // expression IDs can be expensive, we only do this if the diagnostic is
        // enabled.
        if (SizeOfArg &&
            !Diags.isIgnored(diag::warn_sizeof_pointer_expr_memaccess,
                             SizeOfArg->getExprLoc())) {
          // We only compute IDs for expressions if the warning is enabled, and
          // cache the sizeof arg's ID.
          if (SizeOfArgID == llvm::FoldingSetNodeID())
            SizeOfArg->Profile(SizeOfArgID, Context, true);
          llvm::FoldingSetNodeID DestID;
          Dest->Profile(DestID, Context, true);
          if (DestID == SizeOfArgID) {
            // TODO: For strncpy() and friends, this could suggest sizeof(dst)
            //       over sizeof(src) as well.
            unsigned ActionIdx = 0; // Default is to suggest dereferencing.
            StringRef ReadableName = FnName->getName();
  
            if (const UnaryOperator *UnaryOp = dyn_cast<UnaryOperator>(Dest))
              if (UnaryOp->getOpcode() == UO_AddrOf)
                ActionIdx = 1; // If its an address-of operator, just remove it.
            if (!PointeeTy->isIncompleteType() &&
                (Context.getTypeSize(PointeeTy) == Context.getCharWidth()))
              ActionIdx = 2; // If the pointee's size is sizeof(char),
                             // suggest an explicit length.
  
            // If the function is defined as a builtin macro, do not show macro
            // expansion.
            SourceLocation SL = SizeOfArg->getExprLoc();
            SourceRange DSR = Dest->getSourceRange();
            SourceRange SSR = SizeOfArg->getSourceRange();
            SourceManager &SM = getSourceManager();
  
            if (SM.isMacroArgExpansion(SL)) {
              ReadableName = Lexer::getImmediateMacroName(SL, SM, LangOpts);
              SL = SM.getSpellingLoc(SL);
              DSR = SourceRange(SM.getSpellingLoc(DSR.getBegin()),
                               SM.getSpellingLoc(DSR.getEnd()));
              SSR = SourceRange(SM.getSpellingLoc(SSR.getBegin()),
                               SM.getSpellingLoc(SSR.getEnd()));
            }
  
            DiagRuntimeBehavior(SL, SizeOfArg,
                                PDiag(diag::warn_sizeof_pointer_expr_memaccess)
                                  << ReadableName
                                  << PointeeTy
                                  << DestTy
                                  << DSR
                                  << SSR);
            DiagRuntimeBehavior(SL, SizeOfArg,
                           PDiag(diag::warn_sizeof_pointer_expr_memaccess_note)
                                  << ActionIdx
                                  << SSR);
  
            break;
          }
        }
  
        // Also check for cases where the sizeof argument is the exact same
        // type as the memory argument, and where it points to a user-defined
        // record type.
        if (SizeOfArgTy != QualType()) {
          if (PointeeTy->isRecordType() &&
              Context.typesAreCompatible(SizeOfArgTy, DestTy)) {
            DiagRuntimeBehavior(LenExpr->getExprLoc(), Dest,
                                PDiag(diag::warn_sizeof_pointer_type_memaccess)
                                  << FnName << SizeOfArgTy << ArgIdx
                                  << PointeeTy << Dest->getSourceRange()
                                  << LenExpr->getSourceRange());
            break;
          }
        }
      } else if (DestTy->isArrayType()) {
        PointeeTy = DestTy;
      }
  
      if (PointeeTy == QualType())
        continue;
  
      // Always complain about dynamic classes.
      bool IsContained;
      if (const CXXRecordDecl *ContainedRD =
              getContainedDynamicClass(PointeeTy, IsContained)) {
  
        unsigned OperationType = 0;
        const bool IsCmp = BId == Builtin::BImemcmp || BId == Builtin::BIbcmp;
        // "overwritten" if we're warning about the destination for any call
        // but memcmp; otherwise a verb appropriate to the call.
        if (ArgIdx != 0 || IsCmp) {
          if (BId == Builtin::BImemcpy)
            OperationType = 1;
          else if(BId == Builtin::BImemmove)
            OperationType = 2;
          else if (IsCmp)
            OperationType = 3;
        }
  
        DiagRuntimeBehavior(Dest->getExprLoc(), Dest,
                            PDiag(diag::warn_dyn_class_memaccess)
                                << (IsCmp ? ArgIdx + 2 : ArgIdx) << FnName
                                << IsContained << ContainedRD << OperationType
                                << Call->getCallee()->getSourceRange());
      } else if (PointeeTy.hasNonTrivialObjCLifetime() &&
               BId != Builtin::BImemset)
        DiagRuntimeBehavior(
          Dest->getExprLoc(), Dest,
          PDiag(diag::warn_arc_object_memaccess)
            << ArgIdx << FnName << PointeeTy
            << Call->getCallee()->getSourceRange());
      else if (const auto *RT = PointeeTy->getAs<RecordType>()) {
        if ((BId == Builtin::BImemset || BId == Builtin::BIbzero) &&
            RT->getDecl()->isNonTrivialToPrimitiveDefaultInitialize()) {
          DiagRuntimeBehavior(Dest->getExprLoc(), Dest,
                              PDiag(diag::warn_cstruct_memaccess)
                                  << ArgIdx << FnName << PointeeTy << 0);
          SearchNonTrivialToInitializeField::diag(PointeeTy, Dest, *this);
        } else if ((BId == Builtin::BImemcpy || BId == Builtin::BImemmove) &&
                   RT->getDecl()->isNonTrivialToPrimitiveCopy()) {
          DiagRuntimeBehavior(Dest->getExprLoc(), Dest,
                              PDiag(diag::warn_cstruct_memaccess)
                                  << ArgIdx << FnName << PointeeTy << 1);
          SearchNonTrivialToCopyField::diag(PointeeTy, Dest, *this);
        } else {
          continue;
        }
      } else
        continue;
  
      DiagRuntimeBehavior(
        Dest->getExprLoc(), Dest,
        PDiag(diag::note_bad_memaccess_silence)
          << FixItHint::CreateInsertion(ArgRange.getBegin(), "(void*)"));
      break;
    }
  }
  
  // A little helper routine: ignore addition and subtraction of integer literals.
  // This intentionally does not ignore all integer constant expressions because
  // we don't want to remove sizeof().
  static const Expr *ignoreLiteralAdditions(const Expr *Ex, ASTContext &Ctx) {
    Ex = Ex->IgnoreParenCasts();
  
    while (true) {
      const BinaryOperator * BO = dyn_cast<BinaryOperator>(Ex);
      if (!BO || !BO->isAdditiveOp())
        break;
  
      const Expr *RHS = BO->getRHS()->IgnoreParenCasts();
      const Expr *LHS = BO->getLHS()->IgnoreParenCasts();
  
      if (isa<IntegerLiteral>(RHS))
        Ex = LHS;
      else if (isa<IntegerLiteral>(LHS))
        Ex = RHS;
      else
        break;
    }
  
    return Ex;
  }
  
  static bool isConstantSizeArrayWithMoreThanOneElement(QualType Ty,
                                                        ASTContext &Context) {
    // Only handle constant-sized or VLAs, but not flexible members.
    if (const ConstantArrayType *CAT = Context.getAsConstantArrayType(Ty)) {
      // Only issue the FIXIT for arrays of size > 1.
      if (CAT->getSize().getSExtValue() <= 1)
        return false;
    } else if (!Ty->isVariableArrayType()) {
      return false;
    }
    return true;
  }
  
  // Warn if the user has made the 'size' argument to strlcpy or strlcat
  // be the size of the source, instead of the destination.
  void Sema::CheckStrlcpycatArguments(const CallExpr *Call,
                                      IdentifierInfo *FnName) {
  
    // Don't crash if the user has the wrong number of arguments
    unsigned NumArgs = Call->getNumArgs();
    if ((NumArgs != 3) && (NumArgs != 4))
      return;
  
    const Expr *SrcArg = ignoreLiteralAdditions(Call->getArg(1), Context);
    const Expr *SizeArg = ignoreLiteralAdditions(Call->getArg(2), Context);
    const Expr *CompareWithSrc = nullptr;
  
    if (CheckMemorySizeofForComparison(*this, SizeArg, FnName,
                                       Call->getBeginLoc(), Call->getRParenLoc()))
      return;
  
    // Look for 'strlcpy(dst, x, sizeof(x))'
    if (const Expr *Ex = getSizeOfExprArg(SizeArg))
      CompareWithSrc = Ex;
    else {
      // Look for 'strlcpy(dst, x, strlen(x))'
      if (const CallExpr *SizeCall = dyn_cast<CallExpr>(SizeArg)) {
        if (SizeCall->getBuiltinCallee() == Builtin::BIstrlen &&
            SizeCall->getNumArgs() == 1)
          CompareWithSrc = ignoreLiteralAdditions(SizeCall->getArg(0), Context);
      }
    }
  
    if (!CompareWithSrc)
      return;
  
    // Determine if the argument to sizeof/strlen is equal to the source
    // argument.  In principle there's all kinds of things you could do
    // here, for instance creating an == expression and evaluating it with
    // EvaluateAsBooleanCondition, but this uses a more direct technique:
    const DeclRefExpr *SrcArgDRE = dyn_cast<DeclRefExpr>(SrcArg);
    if (!SrcArgDRE)
      return;
  
    const DeclRefExpr *CompareWithSrcDRE = dyn_cast<DeclRefExpr>(CompareWithSrc);
    if (!CompareWithSrcDRE ||
        SrcArgDRE->getDecl() != CompareWithSrcDRE->getDecl())
      return;
  
    const Expr *OriginalSizeArg = Call->getArg(2);
    Diag(CompareWithSrcDRE->getBeginLoc(), diag::warn_strlcpycat_wrong_size)
        << OriginalSizeArg->getSourceRange() << FnName;
  
    // Output a FIXIT hint if the destination is an array (rather than a
    // pointer to an array).  This could be enhanced to handle some
    // pointers if we know the actual size, like if DstArg is 'array+2'
    // we could say 'sizeof(array)-2'.
    const Expr *DstArg = Call->getArg(0)->IgnoreParenImpCasts();
    if (!isConstantSizeArrayWithMoreThanOneElement(DstArg->getType(), Context))
      return;
  
    SmallString<128> sizeString;
    llvm::raw_svector_ostream OS(sizeString);
    OS << "sizeof(";
    DstArg->printPretty(OS, nullptr, getPrintingPolicy());
    OS << ")";
  
    Diag(OriginalSizeArg->getBeginLoc(), diag::note_strlcpycat_wrong_size)
        << FixItHint::CreateReplacement(OriginalSizeArg->getSourceRange(),
                                        OS.str());
  }
  
  /// Check if two expressions refer to the same declaration.
  static bool referToTheSameDecl(const Expr *E1, const Expr *E2) {
    if (const DeclRefExpr *D1 = dyn_cast_or_null<DeclRefExpr>(E1))
      if (const DeclRefExpr *D2 = dyn_cast_or_null<DeclRefExpr>(E2))
        return D1->getDecl() == D2->getDecl();
    return false;
  }
  
  static const Expr *getStrlenExprArg(const Expr *E) {
    if (const CallExpr *CE = dyn_cast<CallExpr>(E)) {
      const FunctionDecl *FD = CE->getDirectCallee();
      if (!FD || FD->getMemoryFunctionKind() != Builtin::BIstrlen)
        return nullptr;
      return CE->getArg(0)->IgnoreParenCasts();
    }
    return nullptr;
  }
  
  // Warn on anti-patterns as the 'size' argument to strncat.
  // The correct size argument should look like following:
  //   strncat(dst, src, sizeof(dst) - strlen(dest) - 1);
  void Sema::CheckStrncatArguments(const CallExpr *CE,
                                   IdentifierInfo *FnName) {
    // Don't crash if the user has the wrong number of arguments.
    if (CE->getNumArgs() < 3)
      return;
    const Expr *DstArg = CE->getArg(0)->IgnoreParenCasts();
    const Expr *SrcArg = CE->getArg(1)->IgnoreParenCasts();
    const Expr *LenArg = CE->getArg(2)->IgnoreParenCasts();
  
    if (CheckMemorySizeofForComparison(*this, LenArg, FnName, CE->getBeginLoc(),
                                       CE->getRParenLoc()))
      return;
  
    // Identify common expressions, which are wrongly used as the size argument
    // to strncat and may lead to buffer overflows.
    unsigned PatternType = 0;
    if (const Expr *SizeOfArg = getSizeOfExprArg(LenArg)) {
      // - sizeof(dst)
      if (referToTheSameDecl(SizeOfArg, DstArg))
        PatternType = 1;
      // - sizeof(src)
      else if (referToTheSameDecl(SizeOfArg, SrcArg))
        PatternType = 2;
    } else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(LenArg)) {
      if (BE->getOpcode() == BO_Sub) {
        const Expr *L = BE->getLHS()->IgnoreParenCasts();
        const Expr *R = BE->getRHS()->IgnoreParenCasts();
        // - sizeof(dst) - strlen(dst)
        if (referToTheSameDecl(DstArg, getSizeOfExprArg(L)) &&
            referToTheSameDecl(DstArg, getStrlenExprArg(R)))
          PatternType = 1;
        // - sizeof(src) - (anything)
        else if (referToTheSameDecl(SrcArg, getSizeOfExprArg(L)))
          PatternType = 2;
      }
    }
  
    if (PatternType == 0)
      return;
  
    // Generate the diagnostic.
    SourceLocation SL = LenArg->getBeginLoc();
    SourceRange SR = LenArg->getSourceRange();
    SourceManager &SM = getSourceManager();
  
    // If the function is defined as a builtin macro, do not show macro expansion.
    if (SM.isMacroArgExpansion(SL)) {
      SL = SM.getSpellingLoc(SL);
      SR = SourceRange(SM.getSpellingLoc(SR.getBegin()),
                       SM.getSpellingLoc(SR.getEnd()));
    }
  
    // Check if the destination is an array (rather than a pointer to an array).
    QualType DstTy = DstArg->getType();
    bool isKnownSizeArray = isConstantSizeArrayWithMoreThanOneElement(DstTy,
                                                                      Context);
    if (!isKnownSizeArray) {
      if (PatternType == 1)
        Diag(SL, diag::warn_strncat_wrong_size) << SR;
      else
        Diag(SL, diag::warn_strncat_src_size) << SR;
      return;
    }
  
    if (PatternType == 1)
      Diag(SL, diag::warn_strncat_large_size) << SR;
    else
      Diag(SL, diag::warn_strncat_src_size) << SR;
  
    SmallString<128> sizeString;
    llvm::raw_svector_ostream OS(sizeString);
    OS << "sizeof(";
    DstArg->printPretty(OS, nullptr, getPrintingPolicy());
    OS << ") - ";
    OS << "strlen(";
    DstArg->printPretty(OS, nullptr, getPrintingPolicy());
    OS << ") - 1";
  
    Diag(SL, diag::note_strncat_wrong_size)
      << FixItHint::CreateReplacement(SR, OS.str());
  }
  
  void
  Sema::CheckReturnValExpr(Expr *RetValExp, QualType lhsType,
                           SourceLocation ReturnLoc,
                           bool isObjCMethod,
                           const AttrVec *Attrs,
                           const FunctionDecl *FD) {
    // Check if the return value is null but should not be.
    if (((Attrs && hasSpecificAttr<ReturnsNonNullAttr>(*Attrs)) ||
         (!isObjCMethod && isNonNullType(Context, lhsType))) &&
        CheckNonNullExpr(*this, RetValExp))
      Diag(ReturnLoc, diag::warn_null_ret)
        << (isObjCMethod ? 1 : 0) << RetValExp->getSourceRange();
  
    // C++11 [basic.stc.dynamic.allocation]p4:
    //   If an allocation function declared with a non-throwing
    //   exception-specification fails to allocate storage, it shall return
    //   a null pointer. Any other allocation function that fails to allocate
    //   storage shall indicate failure only by throwing an exception [...]
    if (FD) {
      OverloadedOperatorKind Op = FD->getOverloadedOperator();
      if (Op == OO_New || Op == OO_Array_New) {
        const FunctionProtoType *Proto
          = FD->getType()->castAs<FunctionProtoType>();
        if (!Proto->isNothrow(/*ResultIfDependent*/true) &&
            CheckNonNullExpr(*this, RetValExp))
          Diag(ReturnLoc, diag::warn_operator_new_returns_null)
            << FD << getLangOpts().CPlusPlus11;
      }
    }
  }
  
  //===--- CHECK: Floating-Point comparisons (-Wfloat-equal) ---------------===//
  
  /// Check for comparisons of floating point operands using != and ==.
  /// Issue a warning if these are no self-comparisons, as they are not likely
  /// to do what the programmer intended.
  void Sema::CheckFloatComparison(SourceLocation Loc, Expr* LHS, Expr *RHS) {
    Expr* LeftExprSansParen = LHS->IgnoreParenImpCasts();
    Expr* RightExprSansParen = RHS->IgnoreParenImpCasts();
  
    // Special case: check for x == x (which is OK).
    // Do not emit warnings for such cases.
    if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LeftExprSansParen))
      if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RightExprSansParen))
        if (DRL->getDecl() == DRR->getDecl())
          return;
  
    // Special case: check for comparisons against literals that can be exactly
    //  represented by APFloat.  In such cases, do not emit a warning.  This
    //  is a heuristic: often comparison against such literals are used to
    //  detect if a value in a variable has not changed.  This clearly can
    //  lead to false negatives.
    if (FloatingLiteral* FLL = dyn_cast<FloatingLiteral>(LeftExprSansParen)) {
      if (FLL->isExact())
        return;
    } else
      if (FloatingLiteral* FLR = dyn_cast<FloatingLiteral>(RightExprSansParen))
        if (FLR->isExact())
          return;
  
    // Check for comparisons with builtin types.
    if (CallExpr* CL = dyn_cast<CallExpr>(LeftExprSansParen))
      if (CL->getBuiltinCallee())
        return;
  
    if (CallExpr* CR = dyn_cast<CallExpr>(RightExprSansParen))
      if (CR->getBuiltinCallee())
        return;
  
    // Emit the diagnostic.
    Diag(Loc, diag::warn_floatingpoint_eq)
      << LHS->getSourceRange() << RHS->getSourceRange();
  }
  
  //===--- CHECK: Integer mixed-sign comparisons (-Wsign-compare) --------===//
  //===--- CHECK: Lossy implicit conversions (-Wconversion) --------------===//
  
  namespace {
  
  /// Structure recording the 'active' range of an integer-valued
  /// expression.
  struct IntRange {
    /// The number of bits active in the int.
    unsigned Width;
  
    /// True if the int is known not to have negative values.
    bool NonNegative;
  
    IntRange(unsigned Width, bool NonNegative)
        : Width(Width), NonNegative(NonNegative) {}
  
    /// Returns the range of the bool type.
    static IntRange forBoolType() {
      return IntRange(1, true);
    }
  
    /// Returns the range of an opaque value of the given integral type.
    static IntRange forValueOfType(ASTContext &C, QualType T) {
      return forValueOfCanonicalType(C,
                            T->getCanonicalTypeInternal().getTypePtr());
    }
  
    /// Returns the range of an opaque value of a canonical integral type.
    static IntRange forValueOfCanonicalType(ASTContext &C, const Type *T) {
      assert(T->isCanonicalUnqualified());
  
      if (const VectorType *VT = dyn_cast<VectorType>(T))
        T = VT->getElementType().getTypePtr();
      if (const ComplexType *CT = dyn_cast<ComplexType>(T))
        T = CT->getElementType().getTypePtr();
      if (const AtomicType *AT = dyn_cast<AtomicType>(T))
        T = AT->getValueType().getTypePtr();
  
      if (!C.getLangOpts().CPlusPlus) {
        // For enum types in C code, use the underlying datatype.
        if (const EnumType *ET = dyn_cast<EnumType>(T))
          T = ET->getDecl()->getIntegerType().getDesugaredType(C).getTypePtr();
      } else if (const EnumType *ET = dyn_cast<EnumType>(T)) {
        // For enum types in C++, use the known bit width of the enumerators.
        EnumDecl *Enum = ET->getDecl();
        // In C++11, enums can have a fixed underlying type. Use this type to
        // compute the range.
        if (Enum->isFixed()) {
          return IntRange(C.getIntWidth(QualType(T, 0)),
                          !ET->isSignedIntegerOrEnumerationType());
        }
  
        unsigned NumPositive = Enum->getNumPositiveBits();
        unsigned NumNegative = Enum->getNumNegativeBits();
  
        if (NumNegative == 0)
          return IntRange(NumPositive, true/*NonNegative*/);
        else
          return IntRange(std::max(NumPositive + 1, NumNegative),
                          false/*NonNegative*/);
      }
  
      const BuiltinType *BT = cast<BuiltinType>(T);
      assert(BT->isInteger());
  
      return IntRange(C.getIntWidth(QualType(T, 0)), BT->isUnsignedInteger());
    }
  
    /// Returns the "target" range of a canonical integral type, i.e.
    /// the range of values expressible in the type.
    ///
    /// This matches forValueOfCanonicalType except that enums have the
    /// full range of their type, not the range of their enumerators.
    static IntRange forTargetOfCanonicalType(ASTContext &C, const Type *T) {
      assert(T->isCanonicalUnqualified());
  
      if (const VectorType *VT = dyn_cast<VectorType>(T))
        T = VT->getElementType().getTypePtr();
      if (const ComplexType *CT = dyn_cast<ComplexType>(T))
        T = CT->getElementType().getTypePtr();
      if (const AtomicType *AT = dyn_cast<AtomicType>(T))
        T = AT->getValueType().getTypePtr();
      if (const EnumType *ET = dyn_cast<EnumType>(T))
        T = C.getCanonicalType(ET->getDecl()->getIntegerType()).getTypePtr();
  
      const BuiltinType *BT = cast<BuiltinType>(T);
      assert(BT->isInteger());
  
      return IntRange(C.getIntWidth(QualType(T, 0)), BT->isUnsignedInteger());
    }
  
    /// Returns the supremum of two ranges: i.e. their conservative merge.
    static IntRange join(IntRange L, IntRange R) {
      return IntRange(std::max(L.Width, R.Width),
                      L.NonNegative && R.NonNegative);
    }
  
    /// Returns the infinum of two ranges: i.e. their aggressive merge.
    static IntRange meet(IntRange L, IntRange R) {
      return IntRange(std::min(L.Width, R.Width),
                      L.NonNegative || R.NonNegative);
    }
  };
  
  } // namespace
  
  static IntRange GetValueRange(ASTContext &C, llvm::APSInt &value,
                                unsigned MaxWidth) {
    if (value.isSigned() && value.isNegative())
      return IntRange(value.getMinSignedBits(), false);
  
    if (value.getBitWidth() > MaxWidth)
      value = value.trunc(MaxWidth);
  
    // isNonNegative() just checks the sign bit without considering
    // signedness.
    return IntRange(value.getActiveBits(), true);
  }
  
  static IntRange GetValueRange(ASTContext &C, APValue &result, QualType Ty,
                                unsigned MaxWidth) {
    if (result.isInt())
      return GetValueRange(C, result.getInt(), MaxWidth);
  
    if (result.isVector()) {
      IntRange R = GetValueRange(C, result.getVectorElt(0), Ty, MaxWidth);
      for (unsigned i = 1, e = result.getVectorLength(); i != e; ++i) {
        IntRange El = GetValueRange(C, result.getVectorElt(i), Ty, MaxWidth);
        R = IntRange::join(R, El);
      }
      return R;
    }
  
    if (result.isComplexInt()) {
      IntRange R = GetValueRange(C, result.getComplexIntReal(), MaxWidth);
      IntRange I = GetValueRange(C, result.getComplexIntImag(), MaxWidth);
      return IntRange::join(R, I);
    }
  
    // This can happen with lossless casts to intptr_t of "based" lvalues.
    // Assume it might use arbitrary bits.
    // FIXME: The only reason we need to pass the type in here is to get
    // the sign right on this one case.  It would be nice if APValue
    // preserved this.
    assert(result.isLValue() || result.isAddrLabelDiff());
    return IntRange(MaxWidth, Ty->isUnsignedIntegerOrEnumerationType());
  }
  
  static QualType GetExprType(const Expr *E) {
    QualType Ty = E->getType();
    if (const AtomicType *AtomicRHS = Ty->getAs<AtomicType>())
      Ty = AtomicRHS->getValueType();
    return Ty;
  }
  
  /// Pseudo-evaluate the given integer expression, estimating the
  /// range of values it might take.
  ///
  /// \param MaxWidth - the width to which the value will be truncated
  static IntRange GetExprRange(ASTContext &C, const Expr *E, unsigned MaxWidth,
                               bool InConstantContext) {
    E = E->IgnoreParens();
  
    // Try a full evaluation first.
    Expr::EvalResult result;
    if (E->EvaluateAsRValue(result, C, InConstantContext))
      return GetValueRange(C, result.Val, GetExprType(E), MaxWidth);
  
    // I think we only want to look through implicit casts here; if the
    // user has an explicit widening cast, we should treat the value as
    // being of the new, wider type.
    if (const auto *CE = dyn_cast<ImplicitCastExpr>(E)) {
      if (CE->getCastKind() == CK_NoOp || CE->getCastKind() == CK_LValueToRValue)
        return GetExprRange(C, CE->getSubExpr(), MaxWidth, InConstantContext);
  
      IntRange OutputTypeRange = IntRange::forValueOfType(C, GetExprType(CE));
  
      bool isIntegerCast = CE->getCastKind() == CK_IntegralCast ||
                           CE->getCastKind() == CK_BooleanToSignedIntegral;
  
      // Assume that non-integer casts can span the full range of the type.
      if (!isIntegerCast)
        return OutputTypeRange;
  
      IntRange SubRange = GetExprRange(C, CE->getSubExpr(),
                                       std::min(MaxWidth, OutputTypeRange.Width),
                                       InConstantContext);
  
      // Bail out if the subexpr's range is as wide as the cast type.
      if (SubRange.Width >= OutputTypeRange.Width)
        return OutputTypeRange;
  
      // Otherwise, we take the smaller width, and we're non-negative if
      // either the output type or the subexpr is.
      return IntRange(SubRange.Width,
                      SubRange.NonNegative || OutputTypeRange.NonNegative);
    }
  
    if (const auto *CO = dyn_cast<ConditionalOperator>(E)) {
      // If we can fold the condition, just take that operand.
      bool CondResult;
      if (CO->getCond()->EvaluateAsBooleanCondition(CondResult, C))
        return GetExprRange(C,
                            CondResult ? CO->getTrueExpr() : CO->getFalseExpr(),
                            MaxWidth, InConstantContext);
  
      // Otherwise, conservatively merge.
      IntRange L =
          GetExprRange(C, CO->getTrueExpr(), MaxWidth, InConstantContext);
      IntRange R =
          GetExprRange(C, CO->getFalseExpr(), MaxWidth, InConstantContext);
      return IntRange::join(L, R);
    }
  
    if (const auto *BO = dyn_cast<BinaryOperator>(E)) {
      switch (BO->getOpcode()) {
      case BO_Cmp:
        llvm_unreachable("builtin <=> should have class type");
  
      // Boolean-valued operations are single-bit and positive.
      case BO_LAnd:
      case BO_LOr:
      case BO_LT:
      case BO_GT:
      case BO_LE:
      case BO_GE:
      case BO_EQ:
      case BO_NE:
        return IntRange::forBoolType();
  
      // The type of the assignments is the type of the LHS, so the RHS
      // is not necessarily the same type.
      case BO_MulAssign:
      case BO_DivAssign:
      case BO_RemAssign:
      case BO_AddAssign:
      case BO_SubAssign:
      case BO_XorAssign:
      case BO_OrAssign:
        // TODO: bitfields?
        return IntRange::forValueOfType(C, GetExprType(E));
  
      // Simple assignments just pass through the RHS, which will have
      // been coerced to the LHS type.
      case BO_Assign:
        // TODO: bitfields?
        return GetExprRange(C, BO->getRHS(), MaxWidth, InConstantContext);
  
      // Operations with opaque sources are black-listed.
      case BO_PtrMemD:
      case BO_PtrMemI:
        return IntRange::forValueOfType(C, GetExprType(E));
  
      // Bitwise-and uses the *infinum* of the two source ranges.
      case BO_And:
      case BO_AndAssign:
        return IntRange::meet(
            GetExprRange(C, BO->getLHS(), MaxWidth, InConstantContext),
            GetExprRange(C, BO->getRHS(), MaxWidth, InConstantContext));
  
      // Left shift gets black-listed based on a judgement call.
      case BO_Shl:
        // ...except that we want to treat '1 << (blah)' as logically
        // positive.  It's an important idiom.
        if (IntegerLiteral *I
              = dyn_cast<IntegerLiteral>(BO->getLHS()->IgnoreParenCasts())) {
          if (I->getValue() == 1) {
            IntRange R = IntRange::forValueOfType(C, GetExprType(E));
            return IntRange(R.Width, /*NonNegative*/ true);
          }
        }
        LLVM_FALLTHROUGH;
  
      case BO_ShlAssign:
        return IntRange::forValueOfType(C, GetExprType(E));
  
      // Right shift by a constant can narrow its left argument.
      case BO_Shr:
      case BO_ShrAssign: {
        IntRange L = GetExprRange(C, BO->getLHS(), MaxWidth, InConstantContext);
  
        // If the shift amount is a positive constant, drop the width by
        // that much.
        llvm::APSInt shift;
        if (BO->getRHS()->isIntegerConstantExpr(shift, C) &&
            shift.isNonNegative()) {
          unsigned zext = shift.getZExtValue();
          if (zext >= L.Width)
            L.Width = (L.NonNegative ? 0 : 1);
          else
            L.Width -= zext;
        }
  
        return L;
      }
  
      // Comma acts as its right operand.
      case BO_Comma:
        return GetExprRange(C, BO->getRHS(), MaxWidth, InConstantContext);
  
      // Black-list pointer subtractions.
      case BO_Sub:
        if (BO->getLHS()->getType()->isPointerType())
          return IntRange::forValueOfType(C, GetExprType(E));
        break;
  
      // The width of a division result is mostly determined by the size
      // of the LHS.
      case BO_Div: {
        // Don't 'pre-truncate' the operands.
        unsigned opWidth = C.getIntWidth(GetExprType(E));
        IntRange L = GetExprRange(C, BO->getLHS(), opWidth, InConstantContext);
  
        // If the divisor is constant, use that.
        llvm::APSInt divisor;
        if (BO->getRHS()->isIntegerConstantExpr(divisor, C)) {
          unsigned log2 = divisor.logBase2(); // floor(log_2(divisor))
          if (log2 >= L.Width)
            L.Width = (L.NonNegative ? 0 : 1);
          else
            L.Width = std::min(L.Width - log2, MaxWidth);
          return L;
        }
  
        // Otherwise, just use the LHS's width.
        IntRange R = GetExprRange(C, BO->getRHS(), opWidth, InConstantContext);
        return IntRange(L.Width, L.NonNegative && R.NonNegative);
      }
  
      // The result of a remainder can't be larger than the result of
      // either side.
      case BO_Rem: {
        // Don't 'pre-truncate' the operands.
        unsigned opWidth = C.getIntWidth(GetExprType(E));
        IntRange L = GetExprRange(C, BO->getLHS(), opWidth, InConstantContext);
        IntRange R = GetExprRange(C, BO->getRHS(), opWidth, InConstantContext);
  
        IntRange meet = IntRange::meet(L, R);
        meet.Width = std::min(meet.Width, MaxWidth);
        return meet;
      }
  
      // The default behavior is okay for these.
      case BO_Mul:
      case BO_Add:
      case BO_Xor:
      case BO_Or:
        break;
      }
  
      // The default case is to treat the operation as if it were closed
      // on the narrowest type that encompasses both operands.
      IntRange L = GetExprRange(C, BO->getLHS(), MaxWidth, InConstantContext);
      IntRange R = GetExprRange(C, BO->getRHS(), MaxWidth, InConstantContext);
      return IntRange::join(L, R);
    }
  
    if (const auto *UO = dyn_cast<UnaryOperator>(E)) {
      switch (UO->getOpcode()) {
      // Boolean-valued operations are white-listed.
      case UO_LNot:
        return IntRange::forBoolType();
  
      // Operations with opaque sources are black-listed.
      case UO_Deref:
      case UO_AddrOf: // should be impossible
        return IntRange::forValueOfType(C, GetExprType(E));
  
      default:
        return GetExprRange(C, UO->getSubExpr(), MaxWidth, InConstantContext);
      }
    }
  
    if (const auto *OVE = dyn_cast<OpaqueValueExpr>(E))
      return GetExprRange(C, OVE->getSourceExpr(), MaxWidth, InConstantContext);
  
    if (const auto *BitField = E->getSourceBitField())
      return IntRange(BitField->getBitWidthValue(C),
                      BitField->getType()->isUnsignedIntegerOrEnumerationType());
  
    return IntRange::forValueOfType(C, GetExprType(E));
  }
  
  static IntRange GetExprRange(ASTContext &C, const Expr *E,
                               bool InConstantContext) {
    return GetExprRange(C, E, C.getIntWidth(GetExprType(E)), InConstantContext);
  }
  
  /// Checks whether the given value, which currently has the given
  /// source semantics, has the same value when coerced through the
  /// target semantics.
  static bool IsSameFloatAfterCast(const llvm::APFloat &value,
                                   const llvm::fltSemantics &Src,
                                   const llvm::fltSemantics &Tgt) {
    llvm::APFloat truncated = value;
  
    bool ignored;
    truncated.convert(Src, llvm::APFloat::rmNearestTiesToEven, &ignored);
    truncated.convert(Tgt, llvm::APFloat::rmNearestTiesToEven, &ignored);
  
    return truncated.bitwiseIsEqual(value);
  }
  
  /// Checks whether the given value, which currently has the given
  /// source semantics, has the same value when coerced through the
  /// target semantics.
  ///
  /// The value might be a vector of floats (or a complex number).
  static bool IsSameFloatAfterCast(const APValue &value,
                                   const llvm::fltSemantics &Src,
                                   const llvm::fltSemantics &Tgt) {
    if (value.isFloat())
      return IsSameFloatAfterCast(value.getFloat(), Src, Tgt);
  
    if (value.isVector()) {
      for (unsigned i = 0, e = value.getVectorLength(); i != e; ++i)
        if (!IsSameFloatAfterCast(value.getVectorElt(i), Src, Tgt))
          return false;
      return true;
    }
  
    assert(value.isComplexFloat());
    return (IsSameFloatAfterCast(value.getComplexFloatReal(), Src, Tgt) &&
            IsSameFloatAfterCast(value.getComplexFloatImag(), Src, Tgt));
  }
  
  static void AnalyzeImplicitConversions(Sema &S, Expr *E, SourceLocation CC,
                                         bool IsListInit = false);
  
  static bool IsEnumConstOrFromMacro(Sema &S, Expr *E) {
    // Suppress cases where we are comparing against an enum constant.
    if (const DeclRefExpr *DR =
        dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts()))
      if (isa<EnumConstantDecl>(DR->getDecl()))
        return true;
  
    // Suppress cases where the value is expanded from a macro, unless that macro
    // is how a language represents a boolean literal. This is the case in both C
    // and Objective-C.
    SourceLocation BeginLoc = E->getBeginLoc();
    if (BeginLoc.isMacroID()) {
      StringRef MacroName = Lexer::getImmediateMacroName(
          BeginLoc, S.getSourceManager(), S.getLangOpts());
      return MacroName != "YES" && MacroName != "NO" &&
             MacroName != "true" && MacroName != "false";
    }
  
    return false;
  }
  
  static bool isKnownToHaveUnsignedValue(Expr *E) {
    return E->getType()->isIntegerType() &&
           (!E->getType()->isSignedIntegerType() ||
            !E->IgnoreParenImpCasts()->getType()->isSignedIntegerType());
  }
  
  namespace {
  /// The promoted range of values of a type. In general this has the
  /// following structure:
  ///
  ///     |-----------| . . . |-----------|
  ///     ^           ^       ^           ^
  ///    Min       HoleMin  HoleMax      Max
  ///
  /// ... where there is only a hole if a signed type is promoted to unsigned
  /// (in which case Min and Max are the smallest and largest representable
  /// values).
  struct PromotedRange {
    // Min, or HoleMax if there is a hole.
    llvm::APSInt PromotedMin;
    // Max, or HoleMin if there is a hole.
    llvm::APSInt PromotedMax;
  
    PromotedRange(IntRange R, unsigned BitWidth, bool Unsigned) {
      if (R.Width == 0)
        PromotedMin = PromotedMax = llvm::APSInt(BitWidth, Unsigned);
      else if (R.Width >= BitWidth && !Unsigned) {
        // Promotion made the type *narrower*. This happens when promoting
        // a < 32-bit unsigned / <= 32-bit signed bit-field to 'signed int'.
        // Treat all values of 'signed int' as being in range for now.
        PromotedMin = llvm::APSInt::getMinValue(BitWidth, Unsigned);
        PromotedMax = llvm::APSInt::getMaxValue(BitWidth, Unsigned);
      } else {
        PromotedMin = llvm::APSInt::getMinValue(R.Width, R.NonNegative)
                          .extOrTrunc(BitWidth);
        PromotedMin.setIsUnsigned(Unsigned);
  
        PromotedMax = llvm::APSInt::getMaxValue(R.Width, R.NonNegative)
                          .extOrTrunc(BitWidth);
        PromotedMax.setIsUnsigned(Unsigned);
      }
    }
  
    // Determine whether this range is contiguous (has no hole).
    bool isContiguous() const { return PromotedMin <= PromotedMax; }
  
    // Where a constant value is within the range.
    enum ComparisonResult {
      LT = 0x1,
      LE = 0x2,
      GT = 0x4,
      GE = 0x8,
      EQ = 0x10,
      NE = 0x20,
      InRangeFlag = 0x40,
  
      Less = LE | LT | NE,
      Min = LE | InRangeFlag,
      InRange = InRangeFlag,
      Max = GE | InRangeFlag,
      Greater = GE | GT | NE,
  
      OnlyValue = LE | GE | EQ | InRangeFlag,
      InHole = NE
    };
  
    ComparisonResult compare(const llvm::APSInt &Value) const {
      assert(Value.getBitWidth() == PromotedMin.getBitWidth() &&
             Value.isUnsigned() == PromotedMin.isUnsigned());
      if (!isContiguous()) {
        assert(Value.isUnsigned() && "discontiguous range for signed compare");
        if (Value.isMinValue()) return Min;
        if (Value.isMaxValue()) return Max;
        if (Value >= PromotedMin) return InRange;
        if (Value <= PromotedMax) return InRange;
        return InHole;
      }
  
      switch (llvm::APSInt::compareValues(Value, PromotedMin)) {
      case -1: return Less;
      case 0: return PromotedMin == PromotedMax ? OnlyValue : Min;
      case 1:
        switch (llvm::APSInt::compareValues(Value, PromotedMax)) {
        case -1: return InRange;
        case 0: return Max;
        case 1: return Greater;
        }
      }
  
      llvm_unreachable("impossible compare result");
    }
  
    static llvm::Optional<StringRef>
    constantValue(BinaryOperatorKind Op, ComparisonResult R, bool ConstantOnRHS) {
      if (Op == BO_Cmp) {
        ComparisonResult LTFlag = LT, GTFlag = GT;
        if (ConstantOnRHS) std::swap(LTFlag, GTFlag);
  
        if (R & EQ) return StringRef("'std::strong_ordering::equal'");
        if (R & LTFlag) return StringRef("'std::strong_ordering::less'");
        if (R & GTFlag) return StringRef("'std::strong_ordering::greater'");
        return llvm::None;
      }
  
      ComparisonResult TrueFlag, FalseFlag;
      if (Op == BO_EQ) {
        TrueFlag = EQ;
        FalseFlag = NE;
      } else if (Op == BO_NE) {
        TrueFlag = NE;
        FalseFlag = EQ;
      } else {
        if ((Op == BO_LT || Op == BO_GE) ^ ConstantOnRHS) {
          TrueFlag = LT;
          FalseFlag = GE;
        } else {
          TrueFlag = GT;
          FalseFlag = LE;
        }
        if (Op == BO_GE || Op == BO_LE)
          std::swap(TrueFlag, FalseFlag);
      }
      if (R & TrueFlag)
        return StringRef("true");
      if (R & FalseFlag)
        return StringRef("false");
      return llvm::None;
    }
  };
  }
  
  static bool HasEnumType(Expr *E) {
    // Strip off implicit integral promotions.
    while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
      if (ICE->getCastKind() != CK_IntegralCast &&
          ICE->getCastKind() != CK_NoOp)
        break;
      E = ICE->getSubExpr();
    }
  
    return E->getType()->isEnumeralType();
  }
  
  static int classifyConstantValue(Expr *Constant) {
    // The values of this enumeration are used in the diagnostics
    // diag::warn_out_of_range_compare and diag::warn_tautological_bool_compare.
    enum ConstantValueKind {
      Miscellaneous = 0,
      LiteralTrue,
      LiteralFalse
    };
    if (auto *BL = dyn_cast<CXXBoolLiteralExpr>(Constant))
      return BL->getValue() ? ConstantValueKind::LiteralTrue
                            : ConstantValueKind::LiteralFalse;
    return ConstantValueKind::Miscellaneous;
  }
  
  static bool CheckTautologicalComparison(Sema &S, BinaryOperator *E,
                                          Expr *Constant, Expr *Other,
                                          const llvm::APSInt &Value,
                                          bool RhsConstant) {
    if (S.inTemplateInstantiation())
      return false;
  
    Expr *OriginalOther = Other;
  
    Constant = Constant->IgnoreParenImpCasts();
    Other = Other->IgnoreParenImpCasts();
  
    // Suppress warnings on tautological comparisons between values of the same
    // enumeration type. There are only two ways we could warn on this:
    //  - If the constant is outside the range of representable values of
    //    the enumeration. In such a case, we should warn about the cast
    //    to enumeration type, not about the comparison.
    //  - If the constant is the maximum / minimum in-range value. For an
    //    enumeratin type, such comparisons can be meaningful and useful.
    if (Constant->getType()->isEnumeralType() &&
        S.Context.hasSameUnqualifiedType(Constant->getType(), Other->getType()))
      return false;
  
    // TODO: Investigate using GetExprRange() to get tighter bounds
    // on the bit ranges.
    QualType OtherT = Other->getType();
    if (const auto *AT = OtherT->getAs<AtomicType>())
      OtherT = AT->getValueType();
    IntRange OtherRange = IntRange::forValueOfType(S.Context, OtherT);
  
    // Special case for ObjC BOOL on targets where its a typedef for a signed char
    // (Namely, macOS).
    bool IsObjCSignedCharBool = S.getLangOpts().ObjC &&
                                S.NSAPIObj->isObjCBOOLType(OtherT) &&
                                OtherT->isSpecificBuiltinType(BuiltinType::SChar);
  
    // Whether we're treating Other as being a bool because of the form of
    // expression despite it having another type (typically 'int' in C).
    bool OtherIsBooleanDespiteType =
        !OtherT->isBooleanType() && Other->isKnownToHaveBooleanValue();
    if (OtherIsBooleanDespiteType || IsObjCSignedCharBool)
      OtherRange = IntRange::forBoolType();
  
    // Determine the promoted range of the other type and see if a comparison of
    // the constant against that range is tautological.
    PromotedRange OtherPromotedRange(OtherRange, Value.getBitWidth(),
                                     Value.isUnsigned());
    auto Cmp = OtherPromotedRange.compare(Value);
    auto Result = PromotedRange::constantValue(E->getOpcode(), Cmp, RhsConstant);
    if (!Result)
      return false;
  
    // Suppress the diagnostic for an in-range comparison if the constant comes
    // from a macro or enumerator. We don't want to diagnose
    //
    //   some_long_value <= INT_MAX
    //
    // when sizeof(int) == sizeof(long).
    bool InRange = Cmp & PromotedRange::InRangeFlag;
    if (InRange && IsEnumConstOrFromMacro(S, Constant))
      return false;
  
    // If this is a comparison to an enum constant, include that
    // constant in the diagnostic.
    const EnumConstantDecl *ED = nullptr;
    if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(Constant))
      ED = dyn_cast<EnumConstantDecl>(DR->getDecl());
  
    // Should be enough for uint128 (39 decimal digits)
    SmallString<64> PrettySourceValue;
    llvm::raw_svector_ostream OS(PrettySourceValue);
    if (ED) {
      OS << '\'' << *ED << "' (" << Value << ")";
    } else if (auto *BL = dyn_cast<ObjCBoolLiteralExpr>(
                 Constant->IgnoreParenImpCasts())) {
      OS << (BL->getValue() ? "YES" : "NO");
    } else {
      OS << Value;
    }
  
    if (IsObjCSignedCharBool) {
      S.DiagRuntimeBehavior(E->getOperatorLoc(), E,
                            S.PDiag(diag::warn_tautological_compare_objc_bool)
                                << OS.str() << *Result);
      return true;
    }
  
    // FIXME: We use a somewhat different formatting for the in-range cases and
    // cases involving boolean values for historical reasons. We should pick a
    // consistent way of presenting these diagnostics.
    if (!InRange || Other->isKnownToHaveBooleanValue()) {
  
      S.DiagRuntimeBehavior(
          E->getOperatorLoc(), E,
          S.PDiag(!InRange ? diag::warn_out_of_range_compare
                           : diag::warn_tautological_bool_compare)
              << OS.str() << classifyConstantValue(Constant) << OtherT
              << OtherIsBooleanDespiteType << *Result
              << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange());
    } else {
      unsigned Diag = (isKnownToHaveUnsignedValue(OriginalOther) && Value == 0)
                          ? (HasEnumType(OriginalOther)
                                 ? diag::warn_unsigned_enum_always_true_comparison
                                 : diag::warn_unsigned_always_true_comparison)
                          : diag::warn_tautological_constant_compare;
  
      S.Diag(E->getOperatorLoc(), Diag)
          << RhsConstant << OtherT << E->getOpcodeStr() << OS.str() << *Result
          << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
    }
  
    return true;
  }
  
  /// Analyze the operands of the given comparison.  Implements the
  /// fallback case from AnalyzeComparison.
  static void AnalyzeImpConvsInComparison(Sema &S, BinaryOperator *E) {
    AnalyzeImplicitConversions(S, E->getLHS(), E->getOperatorLoc());
    AnalyzeImplicitConversions(S, E->getRHS(), E->getOperatorLoc());
  }
  
  /// Implements -Wsign-compare.
  ///
  /// \param E the binary operator to check for warnings
  static void AnalyzeComparison(Sema &S, BinaryOperator *E) {
    // The type the comparison is being performed in.
    QualType T = E->getLHS()->getType();
  
    // Only analyze comparison operators where both sides have been converted to
    // the same type.
    if (!S.Context.hasSameUnqualifiedType(T, E->getRHS()->getType()))
      return AnalyzeImpConvsInComparison(S, E);
  
    // Don't analyze value-dependent comparisons directly.
    if (E->isValueDependent())
      return AnalyzeImpConvsInComparison(S, E);
  
    Expr *LHS = E->getLHS();
    Expr *RHS = E->getRHS();
  
    if (T->isIntegralType(S.Context)) {
      llvm::APSInt RHSValue;
      llvm::APSInt LHSValue;
  
      bool IsRHSIntegralLiteral = RHS->isIntegerConstantExpr(RHSValue, S.Context);
      bool IsLHSIntegralLiteral = LHS->isIntegerConstantExpr(LHSValue, S.Context);
  
      // We don't care about expressions whose result is a constant.
      if (IsRHSIntegralLiteral && IsLHSIntegralLiteral)
        return AnalyzeImpConvsInComparison(S, E);
  
      // We only care about expressions where just one side is literal
      if (IsRHSIntegralLiteral ^ IsLHSIntegralLiteral) {
        // Is the constant on the RHS or LHS?
        const bool RhsConstant = IsRHSIntegralLiteral;
        Expr *Const = RhsConstant ? RHS : LHS;
        Expr *Other = RhsConstant ? LHS : RHS;
        const llvm::APSInt &Value = RhsConstant ? RHSValue : LHSValue;
  
        // Check whether an integer constant comparison results in a value
        // of 'true' or 'false'.
        if (CheckTautologicalComparison(S, E, Const, Other, Value, RhsConstant))
          return AnalyzeImpConvsInComparison(S, E);
      }
    }
  
    if (!T->hasUnsignedIntegerRepresentation()) {
      // We don't do anything special if this isn't an unsigned integral
      // comparison:  we're only interested in integral comparisons, and
      // signed comparisons only happen in cases we don't care to warn about.
      return AnalyzeImpConvsInComparison(S, E);
    }
  
    LHS = LHS->IgnoreParenImpCasts();
    RHS = RHS->IgnoreParenImpCasts();
  
    if (!S.getLangOpts().CPlusPlus) {
      // Avoid warning about comparison of integers with different signs when
      // RHS/LHS has a `typeof(E)` type whose sign is different from the sign of
      // the type of `E`.
      if (const auto *TET = dyn_cast<TypeOfExprType>(LHS->getType()))
        LHS = TET->getUnderlyingExpr()->IgnoreParenImpCasts();
      if (const auto *TET = dyn_cast<TypeOfExprType>(RHS->getType()))
        RHS = TET->getUnderlyingExpr()->IgnoreParenImpCasts();
    }
  
    // Check to see if one of the (unmodified) operands is of different
    // signedness.
    Expr *signedOperand, *unsignedOperand;
    if (LHS->getType()->hasSignedIntegerRepresentation()) {
      assert(!RHS->getType()->hasSignedIntegerRepresentation() &&
             "unsigned comparison between two signed integer expressions?");
      signedOperand = LHS;
      unsignedOperand = RHS;
    } else if (RHS->getType()->hasSignedIntegerRepresentation()) {
      signedOperand = RHS;
      unsignedOperand = LHS;
    } else {
      return AnalyzeImpConvsInComparison(S, E);
    }
  
    // Otherwise, calculate the effective range of the signed operand.
    IntRange signedRange =
        GetExprRange(S.Context, signedOperand, S.isConstantEvaluated());
  
    // Go ahead and analyze implicit conversions in the operands.  Note
    // that we skip the implicit conversions on both sides.
    AnalyzeImplicitConversions(S, LHS, E->getOperatorLoc());
    AnalyzeImplicitConversions(S, RHS, E->getOperatorLoc());
  
    // If the signed range is non-negative, -Wsign-compare won't fire.
    if (signedRange.NonNegative)
      return;
  
    // For (in)equality comparisons, if the unsigned operand is a
    // constant which cannot collide with a overflowed signed operand,
    // then reinterpreting the signed operand as unsigned will not
    // change the result of the comparison.
    if (E->isEqualityOp()) {
      unsigned comparisonWidth = S.Context.getIntWidth(T);
      IntRange unsignedRange =
          GetExprRange(S.Context, unsignedOperand, S.isConstantEvaluated());
  
      // We should never be unable to prove that the unsigned operand is
      // non-negative.
      assert(unsignedRange.NonNegative && "unsigned range includes negative?");
  
      if (unsignedRange.Width < comparisonWidth)
        return;
    }
  
    S.DiagRuntimeBehavior(E->getOperatorLoc(), E,
                          S.PDiag(diag::warn_mixed_sign_comparison)
                              << LHS->getType() << RHS->getType()
                              << LHS->getSourceRange() << RHS->getSourceRange());
  }
  
  /// Analyzes an attempt to assign the given value to a bitfield.
  ///
  /// Returns true if there was something fishy about the attempt.
  static bool AnalyzeBitFieldAssignment(Sema &S, FieldDecl *Bitfield, Expr *Init,
                                        SourceLocation InitLoc) {
    assert(Bitfield->isBitField());
    if (Bitfield->isInvalidDecl())
      return false;
  
    // White-list bool bitfields.
    QualType BitfieldType = Bitfield->getType();
    if (BitfieldType->isBooleanType())
       return false;
  
    if (BitfieldType->isEnumeralType()) {
      EnumDecl *BitfieldEnumDecl = BitfieldType->castAs<EnumType>()->getDecl();
      // If the underlying enum type was not explicitly specified as an unsigned
      // type and the enum contain only positive values, MSVC++ will cause an
      // inconsistency by storing this as a signed type.
      if (S.getLangOpts().CPlusPlus11 &&
          !BitfieldEnumDecl->getIntegerTypeSourceInfo() &&
          BitfieldEnumDecl->getNumPositiveBits() > 0 &&
          BitfieldEnumDecl->getNumNegativeBits() == 0) {
        S.Diag(InitLoc, diag::warn_no_underlying_type_specified_for_enum_bitfield)
          << BitfieldEnumDecl->getNameAsString();
      }
    }
  
    if (Bitfield->getType()->isBooleanType())
      return false;
  
    // Ignore value- or type-dependent expressions.
    if (Bitfield->getBitWidth()->isValueDependent() ||
        Bitfield->getBitWidth()->isTypeDependent() ||
        Init->isValueDependent() ||
        Init->isTypeDependent())
      return false;
  
    Expr *OriginalInit = Init->IgnoreParenImpCasts();
    unsigned FieldWidth = Bitfield->getBitWidthValue(S.Context);
  
    Expr::EvalResult Result;
    if (!OriginalInit->EvaluateAsInt(Result, S.Context,
                                     Expr::SE_AllowSideEffects)) {
      // The RHS is not constant.  If the RHS has an enum type, make sure the
      // bitfield is wide enough to hold all the values of the enum without
      // truncation.
      if (const auto *EnumTy = OriginalInit->getType()->getAs<EnumType>()) {
        EnumDecl *ED = EnumTy->getDecl();
        bool SignedBitfield = BitfieldType->isSignedIntegerType();
  
        // Enum types are implicitly signed on Windows, so check if there are any
        // negative enumerators to see if the enum was intended to be signed or
        // not.
        bool SignedEnum = ED->getNumNegativeBits() > 0;
  
        // Check for surprising sign changes when assigning enum values to a
        // bitfield of different signedness.  If the bitfield is signed and we
        // have exactly the right number of bits to store this unsigned enum,
        // suggest changing the enum to an unsigned type. This typically happens
        // on Windows where unfixed enums always use an underlying type of 'int'.
        unsigned DiagID = 0;
        if (SignedEnum && !SignedBitfield) {
          DiagID = diag::warn_unsigned_bitfield_assigned_signed_enum;
        } else if (SignedBitfield && !SignedEnum &&
                   ED->getNumPositiveBits() == FieldWidth) {
          DiagID = diag::warn_signed_bitfield_enum_conversion;
        }
  
        if (DiagID) {
          S.Diag(InitLoc, DiagID) << Bitfield << ED;
          TypeSourceInfo *TSI = Bitfield->getTypeSourceInfo();
          SourceRange TypeRange =
              TSI ? TSI->getTypeLoc().getSourceRange() : SourceRange();
          S.Diag(Bitfield->getTypeSpecStartLoc(), diag::note_change_bitfield_sign)
              << SignedEnum << TypeRange;
        }
  
        // Compute the required bitwidth. If the enum has negative values, we need
        // one more bit than the normal number of positive bits to represent the
        // sign bit.
        unsigned BitsNeeded = SignedEnum ? std::max(ED->getNumPositiveBits() + 1,
                                                    ED->getNumNegativeBits())
                                         : ED->getNumPositiveBits();
  
        // Check the bitwidth.
        if (BitsNeeded > FieldWidth) {
          Expr *WidthExpr = Bitfield->getBitWidth();
          S.Diag(InitLoc, diag::warn_bitfield_too_small_for_enum)
              << Bitfield << ED;
          S.Diag(WidthExpr->getExprLoc(), diag::note_widen_bitfield)
              << BitsNeeded << ED << WidthExpr->getSourceRange();
        }
      }
  
      return false;
    }
  
    llvm::APSInt Value = Result.Val.getInt();
  
    unsigned OriginalWidth = Value.getBitWidth();
  
    if (!Value.isSigned() || Value.isNegative())
      if (UnaryOperator *UO = dyn_cast<UnaryOperator>(OriginalInit))
        if (UO->getOpcode() == UO_Minus || UO->getOpcode() == UO_Not)
          OriginalWidth = Value.getMinSignedBits();
  
    if (OriginalWidth <= FieldWidth)
      return false;
  
    // Compute the value which the bitfield will contain.
    llvm::APSInt TruncatedValue = Value.trunc(FieldWidth);
    TruncatedValue.setIsSigned(BitfieldType->isSignedIntegerType());
  
    // Check whether the stored value is equal to the original value.
    TruncatedValue = TruncatedValue.extend(OriginalWidth);
    if (llvm::APSInt::isSameValue(Value, TruncatedValue))
      return false;
  
    // Special-case bitfields of width 1: booleans are naturally 0/1, and
    // therefore don't strictly fit into a signed bitfield of width 1.
    if (FieldWidth == 1 && Value == 1)
      return false;
  
    std::string PrettyValue = Value.toString(10);
    std::string PrettyTrunc = TruncatedValue.toString(10);
  
    S.Diag(InitLoc, diag::warn_impcast_bitfield_precision_constant)
      << PrettyValue << PrettyTrunc << OriginalInit->getType()
      << Init->getSourceRange();
  
    return true;
  }
  
  /// Analyze the given simple or compound assignment for warning-worthy
  /// operations.
  static void AnalyzeAssignment(Sema &S, BinaryOperator *E) {
    // Just recurse on the LHS.
    AnalyzeImplicitConversions(S, E->getLHS(), E->getOperatorLoc());
  
    // We want to recurse on the RHS as normal unless we're assigning to
    // a bitfield.
    if (FieldDecl *Bitfield = E->getLHS()->getSourceBitField()) {
      if (AnalyzeBitFieldAssignment(S, Bitfield, E->getRHS(),
                                    E->getOperatorLoc())) {
        // Recurse, ignoring any implicit conversions on the RHS.
        return AnalyzeImplicitConversions(S, E->getRHS()->IgnoreParenImpCasts(),
                                          E->getOperatorLoc());
      }
    }
  
    AnalyzeImplicitConversions(S, E->getRHS(), E->getOperatorLoc());
  
    // Diagnose implicitly sequentially-consistent atomic assignment.
    if (E->getLHS()->getType()->isAtomicType())
      S.Diag(E->getRHS()->getBeginLoc(), diag::warn_atomic_implicit_seq_cst);
  }
  
  /// Diagnose an implicit cast;  purely a helper for CheckImplicitConversion.
  static void DiagnoseImpCast(Sema &S, Expr *E, QualType SourceType, QualType T,
                              SourceLocation CContext, unsigned diag,
                              bool pruneControlFlow = false) {
    if (pruneControlFlow) {
      S.DiagRuntimeBehavior(E->getExprLoc(), E,
                            S.PDiag(diag)
                                << SourceType << T << E->getSourceRange()
                                << SourceRange(CContext));
      return;
    }
    S.Diag(E->getExprLoc(), diag)
      << SourceType << T << E->getSourceRange() << SourceRange(CContext);
  }
  
  /// Diagnose an implicit cast;  purely a helper for CheckImplicitConversion.
  static void DiagnoseImpCast(Sema &S, Expr *E, QualType T,
                              SourceLocation CContext,
                              unsigned diag, bool pruneControlFlow = false) {
    DiagnoseImpCast(S, E, E->getType(), T, CContext, diag, pruneControlFlow);
  }
  
  static bool isObjCSignedCharBool(Sema &S, QualType Ty) {
    return Ty->isSpecificBuiltinType(BuiltinType::SChar) &&
        S.getLangOpts().ObjC && S.NSAPIObj->isObjCBOOLType(Ty);
  }
  
  static void adornObjCBoolConversionDiagWithTernaryFixit(
      Sema &S, Expr *SourceExpr, const Sema::SemaDiagnosticBuilder &Builder) {
    Expr *Ignored = SourceExpr->IgnoreImplicit();
    if (const auto *OVE = dyn_cast<OpaqueValueExpr>(Ignored))
      Ignored = OVE->getSourceExpr();
    bool NeedsParens = isa<AbstractConditionalOperator>(Ignored) ||
                       isa<BinaryOperator>(Ignored) ||
                       isa<CXXOperatorCallExpr>(Ignored);
    SourceLocation EndLoc = S.getLocForEndOfToken(SourceExpr->getEndLoc());
    if (NeedsParens)
      Builder << FixItHint::CreateInsertion(SourceExpr->getBeginLoc(), "(")
              << FixItHint::CreateInsertion(EndLoc, ")");
    Builder << FixItHint::CreateInsertion(EndLoc, " ? YES : NO");
  }
  
  /// Diagnose an implicit cast from a floating point value to an integer value.
  static void DiagnoseFloatingImpCast(Sema &S, Expr *E, QualType T,
                                      SourceLocation CContext) {
    const bool IsBool = T->isSpecificBuiltinType(BuiltinType::Bool);
    const bool PruneWarnings = S.inTemplateInstantiation();
  
    Expr *InnerE = E->IgnoreParenImpCasts();
    // We also want to warn on, e.g., "int i = -1.234"
    if (UnaryOperator *UOp = dyn_cast<UnaryOperator>(InnerE))
      if (UOp->getOpcode() == UO_Minus || UOp->getOpcode() == UO_Plus)
        InnerE = UOp->getSubExpr()->IgnoreParenImpCasts();
  
    const bool IsLiteral =
        isa<FloatingLiteral>(E) || isa<FloatingLiteral>(InnerE);
  
    llvm::APFloat Value(0.0);
    bool IsConstant =
      E->EvaluateAsFloat(Value, S.Context, Expr::SE_AllowSideEffects);
    if (!IsConstant) {
      if (isObjCSignedCharBool(S, T)) {
        return adornObjCBoolConversionDiagWithTernaryFixit(
            S, E,
            S.Diag(CContext, diag::warn_impcast_float_to_objc_signed_char_bool)
                << E->getType());
      }
  
      return DiagnoseImpCast(S, E, T, CContext,
                             diag::warn_impcast_float_integer, PruneWarnings);
    }
  
    bool isExact = false;
  
    llvm::APSInt IntegerValue(S.Context.getIntWidth(T),
                              T->hasUnsignedIntegerRepresentation());
    llvm::APFloat::opStatus Result = Value.convertToInteger(
        IntegerValue, llvm::APFloat::rmTowardZero, &isExact);
  
    // FIXME: Force the precision of the source value down so we don't print
    // digits which are usually useless (we don't really care here if we
    // truncate a digit by accident in edge cases).  Ideally, APFloat::toString
    // would automatically print the shortest representation, but it's a bit
    // tricky to implement.
    SmallString<16> PrettySourceValue;
    unsigned precision = llvm::APFloat::semanticsPrecision(Value.getSemantics());
    precision = (precision * 59 + 195) / 196;
    Value.toString(PrettySourceValue, precision);
  
    if (isObjCSignedCharBool(S, T) && IntegerValue != 0 && IntegerValue != 1) {
      return adornObjCBoolConversionDiagWithTernaryFixit(
          S, E,
          S.Diag(CContext, diag::warn_impcast_constant_value_to_objc_bool)
              << PrettySourceValue);
    }
  
    if (Result == llvm::APFloat::opOK && isExact) {
      if (IsLiteral) return;
      return DiagnoseImpCast(S, E, T, CContext, diag::warn_impcast_float_integer,
                             PruneWarnings);
    }
  
    // Conversion of a floating-point value to a non-bool integer where the
    // integral part cannot be represented by the integer type is undefined.
    if (!IsBool && Result == llvm::APFloat::opInvalidOp)
      return DiagnoseImpCast(
          S, E, T, CContext,
          IsLiteral ? diag::warn_impcast_literal_float_to_integer_out_of_range
                    : diag::warn_impcast_float_to_integer_out_of_range,
          PruneWarnings);
  
    unsigned DiagID = 0;
    if (IsLiteral) {
      // Warn on floating point literal to integer.
      DiagID = diag::warn_impcast_literal_float_to_integer;
    } else if (IntegerValue == 0) {
      if (Value.isZero()) {  // Skip -0.0 to 0 conversion.
        return DiagnoseImpCast(S, E, T, CContext,
                               diag::warn_impcast_float_integer, PruneWarnings);
      }
      // Warn on non-zero to zero conversion.
      DiagID = diag::warn_impcast_float_to_integer_zero;
    } else {
      if (IntegerValue.isUnsigned()) {
        if (!IntegerValue.isMaxValue()) {
          return DiagnoseImpCast(S, E, T, CContext,
                                 diag::warn_impcast_float_integer, PruneWarnings);
        }
      } else {  // IntegerValue.isSigned()
        if (!IntegerValue.isMaxSignedValue() &&
            !IntegerValue.isMinSignedValue()) {
          return DiagnoseImpCast(S, E, T, CContext,
                                 diag::warn_impcast_float_integer, PruneWarnings);
        }
      }
      // Warn on evaluatable floating point expression to integer conversion.
      DiagID = diag::warn_impcast_float_to_integer;
    }
  
    SmallString<16> PrettyTargetValue;
    if (IsBool)
      PrettyTargetValue = Value.isZero() ? "false" : "true";
    else
      IntegerValue.toString(PrettyTargetValue);
  
    if (PruneWarnings) {
      S.DiagRuntimeBehavior(E->getExprLoc(), E,
                            S.PDiag(DiagID)
                                << E->getType() << T.getUnqualifiedType()
                                << PrettySourceValue << PrettyTargetValue
                                << E->getSourceRange() << SourceRange(CContext));
    } else {
      S.Diag(E->getExprLoc(), DiagID)
          << E->getType() << T.getUnqualifiedType() << PrettySourceValue
          << PrettyTargetValue << E->getSourceRange() << SourceRange(CContext);
    }
  }
  
  /// Analyze the given compound assignment for the possible losing of
  /// floating-point precision.
  static void AnalyzeCompoundAssignment(Sema &S, BinaryOperator *E) {
    assert(isa<CompoundAssignOperator>(E) &&
           "Must be compound assignment operation");
    // Recurse on the LHS and RHS in here
    AnalyzeImplicitConversions(S, E->getLHS(), E->getOperatorLoc());
    AnalyzeImplicitConversions(S, E->getRHS(), E->getOperatorLoc());
  
    if (E->getLHS()->getType()->isAtomicType())
      S.Diag(E->getOperatorLoc(), diag::warn_atomic_implicit_seq_cst);
  
    // Now check the outermost expression
    const auto *ResultBT = E->getLHS()->getType()->getAs<BuiltinType>();
    const auto *RBT = cast<CompoundAssignOperator>(E)
                          ->getComputationResultType()
                          ->getAs<BuiltinType>();
  
    // The below checks assume source is floating point.
    if (!ResultBT || !RBT || !RBT->isFloatingPoint()) return;
  
    // If source is floating point but target is an integer.
    if (ResultBT->isInteger())
      return DiagnoseImpCast(S, E, E->getRHS()->getType(), E->getLHS()->getType(),
                             E->getExprLoc(), diag::warn_impcast_float_integer);
  
    if (!ResultBT->isFloatingPoint())
      return;
  
    // If both source and target are floating points, warn about losing precision.
    int Order = S.getASTContext().getFloatingTypeSemanticOrder(
        QualType(ResultBT, 0), QualType(RBT, 0));
    if (Order < 0 && !S.SourceMgr.isInSystemMacro(E->getOperatorLoc()))
      // warn about dropping FP rank.
      DiagnoseImpCast(S, E->getRHS(), E->getLHS()->getType(), E->getOperatorLoc(),
                      diag::warn_impcast_float_result_precision);
  }
  
  static std::string PrettyPrintInRange(const llvm::APSInt &Value,
                                        IntRange Range) {
    if (!Range.Width) return "0";
  
    llvm::APSInt ValueInRange = Value;
    ValueInRange.setIsSigned(!Range.NonNegative);
    ValueInRange = ValueInRange.trunc(Range.Width);
    return ValueInRange.toString(10);
  }
  
  static bool IsImplicitBoolFloatConversion(Sema &S, Expr *Ex, bool ToBool) {
    if (!isa<ImplicitCastExpr>(Ex))
      return false;
  
    Expr *InnerE = Ex->IgnoreParenImpCasts();
    const Type *Target = S.Context.getCanonicalType(Ex->getType()).getTypePtr();
    const Type *Source =
      S.Context.getCanonicalType(InnerE->getType()).getTypePtr();
    if (Target->isDependentType())
      return false;
  
    const BuiltinType *FloatCandidateBT =
      dyn_cast<BuiltinType>(ToBool ? Source : Target);
    const Type *BoolCandidateType = ToBool ? Target : Source;
  
    return (BoolCandidateType->isSpecificBuiltinType(BuiltinType::Bool) &&
            FloatCandidateBT && (FloatCandidateBT->isFloatingPoint()));
  }
  
  static void CheckImplicitArgumentConversions(Sema &S, CallExpr *TheCall,
                                               SourceLocation CC) {
    unsigned NumArgs = TheCall->getNumArgs();
    for (unsigned i = 0; i < NumArgs; ++i) {
      Expr *CurrA = TheCall->getArg(i);
      if (!IsImplicitBoolFloatConversion(S, CurrA, true))
        continue;
  
      bool IsSwapped = ((i > 0) &&
          IsImplicitBoolFloatConversion(S, TheCall->getArg(i - 1), false));
      IsSwapped |= ((i < (NumArgs - 1)) &&
          IsImplicitBoolFloatConversion(S, TheCall->getArg(i + 1), false));
      if (IsSwapped) {
        // Warn on this floating-point to bool conversion.
        DiagnoseImpCast(S, CurrA->IgnoreParenImpCasts(),
                        CurrA->getType(), CC,
                        diag::warn_impcast_floating_point_to_bool);
      }
    }
  }
  
  static void DiagnoseNullConversion(Sema &S, Expr *E, QualType T,
                                     SourceLocation CC) {
    if (S.Diags.isIgnored(diag::warn_impcast_null_pointer_to_integer,
                          E->getExprLoc()))
      return;
  
    // Don't warn on functions which have return type nullptr_t.
    if (isa<CallExpr>(E))
      return;
  
    // Check for NULL (GNUNull) or nullptr (CXX11_nullptr).
    const Expr::NullPointerConstantKind NullKind =
        E->isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull);
    if (NullKind != Expr::NPCK_GNUNull && NullKind != Expr::NPCK_CXX11_nullptr)
      return;
  
    // Return if target type is a safe conversion.
    if (T->isAnyPointerType() || T->isBlockPointerType() ||
        T->isMemberPointerType() || !T->isScalarType() || T->isNullPtrType())
      return;
  
    SourceLocation Loc = E->getSourceRange().getBegin();
  
    // Venture through the macro stacks to get to the source of macro arguments.
    // The new location is a better location than the complete location that was
    // passed in.
    Loc = S.SourceMgr.getTopMacroCallerLoc(Loc);
    CC = S.SourceMgr.getTopMacroCallerLoc(CC);
  
    // __null is usually wrapped in a macro.  Go up a macro if that is the case.
    if (NullKind == Expr::NPCK_GNUNull && Loc.isMacroID()) {
      StringRef MacroName = Lexer::getImmediateMacroNameForDiagnostics(
          Loc, S.SourceMgr, S.getLangOpts());
      if (MacroName == "NULL")
        Loc = S.SourceMgr.getImmediateExpansionRange(Loc).getBegin();
    }
  
    // Only warn if the null and context location are in the same macro expansion.
    if (S.SourceMgr.getFileID(Loc) != S.SourceMgr.getFileID(CC))
      return;
  
    S.Diag(Loc, diag::warn_impcast_null_pointer_to_integer)
        << (NullKind == Expr::NPCK_CXX11_nullptr) << T << SourceRange(CC)
        << FixItHint::CreateReplacement(Loc,
                                        S.getFixItZeroLiteralForType(T, Loc));
  }
  
  static void checkObjCArrayLiteral(Sema &S, QualType TargetType,
                                    ObjCArrayLiteral *ArrayLiteral);
  
  static void
  checkObjCDictionaryLiteral(Sema &S, QualType TargetType,
                             ObjCDictionaryLiteral *DictionaryLiteral);
  
  /// Check a single element within a collection literal against the
  /// target element type.
  static void checkObjCCollectionLiteralElement(Sema &S,
                                                QualType TargetElementType,
                                                Expr *Element,
                                                unsigned ElementKind) {
    // Skip a bitcast to 'id' or qualified 'id'.
    if (auto ICE = dyn_cast<ImplicitCastExpr>(Element)) {
      if (ICE->getCastKind() == CK_BitCast &&
          ICE->getSubExpr()->getType()->getAs<ObjCObjectPointerType>())
        Element = ICE->getSubExpr();
    }
  
    QualType ElementType = Element->getType();
    ExprResult ElementResult(Element);
    if (ElementType->getAs<ObjCObjectPointerType>() &&
        S.CheckSingleAssignmentConstraints(TargetElementType,
                                           ElementResult,
                                           false, false)
          != Sema::Compatible) {
      S.Diag(Element->getBeginLoc(), diag::warn_objc_collection_literal_element)
          << ElementType << ElementKind << TargetElementType
          << Element->getSourceRange();
    }
  
    if (auto ArrayLiteral = dyn_cast<ObjCArrayLiteral>(Element))
      checkObjCArrayLiteral(S, TargetElementType, ArrayLiteral);
    else if (auto DictionaryLiteral = dyn_cast<ObjCDictionaryLiteral>(Element))
      checkObjCDictionaryLiteral(S, TargetElementType, DictionaryLiteral);
  }
  
  /// Check an Objective-C array literal being converted to the given
  /// target type.
  static void checkObjCArrayLiteral(Sema &S, QualType TargetType,
                                    ObjCArrayLiteral *ArrayLiteral) {
    if (!S.NSArrayDecl)
      return;
  
    const auto *TargetObjCPtr = TargetType->getAs<ObjCObjectPointerType>();
    if (!TargetObjCPtr)
      return;
  
    if (TargetObjCPtr->isUnspecialized() ||
        TargetObjCPtr->getInterfaceDecl()->getCanonicalDecl()
          != S.NSArrayDecl->getCanonicalDecl())
      return;
  
    auto TypeArgs = TargetObjCPtr->getTypeArgs();
    if (TypeArgs.size() != 1)
      return;
  
    QualType TargetElementType = TypeArgs[0];
    for (unsigned I = 0, N = ArrayLiteral->getNumElements(); I != N; ++I) {
      checkObjCCollectionLiteralElement(S, TargetElementType,
                                        ArrayLiteral->getElement(I),
                                        0);
    }
  }
  
  /// Check an Objective-C dictionary literal being converted to the given
  /// target type.
  static void
  checkObjCDictionaryLiteral(Sema &S, QualType TargetType,
                             ObjCDictionaryLiteral *DictionaryLiteral) {
    if (!S.NSDictionaryDecl)
      return;
  
    const auto *TargetObjCPtr = TargetType->getAs<ObjCObjectPointerType>();
    if (!TargetObjCPtr)
      return;
  
    if (TargetObjCPtr->isUnspecialized() ||
        TargetObjCPtr->getInterfaceDecl()->getCanonicalDecl()
          != S.NSDictionaryDecl->getCanonicalDecl())
      return;
  
    auto TypeArgs = TargetObjCPtr->getTypeArgs();
    if (TypeArgs.size() != 2)
      return;
  
    QualType TargetKeyType = TypeArgs[0];
    QualType TargetObjectType = TypeArgs[1];
    for (unsigned I = 0, N = DictionaryLiteral->getNumElements(); I != N; ++I) {
      auto Element = DictionaryLiteral->getKeyValueElement(I);
      checkObjCCollectionLiteralElement(S, TargetKeyType, Element.Key, 1);
      checkObjCCollectionLiteralElement(S, TargetObjectType, Element.Value, 2);
    }
  }
  
  // Helper function to filter out cases for constant width constant conversion.
  // Don't warn on char array initialization or for non-decimal values.
  static bool isSameWidthConstantConversion(Sema &S, Expr *E, QualType T,
                                            SourceLocation CC) {
    // If initializing from a constant, and the constant starts with '0',
    // then it is a binary, octal, or hexadecimal.  Allow these constants
    // to fill all the bits, even if there is a sign change.
    if (auto *IntLit = dyn_cast<IntegerLiteral>(E->IgnoreParenImpCasts())) {
      const char FirstLiteralCharacter =
          S.getSourceManager().getCharacterData(IntLit->getBeginLoc())[0];
      if (FirstLiteralCharacter == '0')
        return false;
    }
  
    // If the CC location points to a '{', and the type is char, then assume
    // assume it is an array initialization.
    if (CC.isValid() && T->isCharType()) {
      const char FirstContextCharacter =
          S.getSourceManager().getCharacterData(CC)[0];
      if (FirstContextCharacter == '{')
        return false;
    }
  
    return true;
  }
  
  static const IntegerLiteral *getIntegerLiteral(Expr *E) {
    const auto *IL = dyn_cast<IntegerLiteral>(E);
    if (!IL) {
      if (auto *UO = dyn_cast<UnaryOperator>(E)) {
        if (UO->getOpcode() == UO_Minus)
          return dyn_cast<IntegerLiteral>(UO->getSubExpr());
      }
    }
  
    return IL;
  }
  
  static void DiagnoseIntInBoolContext(Sema &S, Expr *E) {
    E = E->IgnoreParenImpCasts();
    SourceLocation ExprLoc = E->getExprLoc();
  
    if (const auto *BO = dyn_cast<BinaryOperator>(E)) {
      BinaryOperator::Opcode Opc = BO->getOpcode();
      Expr::EvalResult Result;
      // Do not diagnose unsigned shifts.
      if (Opc == BO_Shl) {
        const auto *LHS = getIntegerLiteral(BO->getLHS());
        const auto *RHS = getIntegerLiteral(BO->getRHS());
        if (LHS && LHS->getValue() == 0)
          S.Diag(ExprLoc, diag::warn_left_shift_always) << 0;
        else if (!E->isValueDependent() && LHS && RHS &&
                 RHS->getValue().isNonNegative() &&
                 E->EvaluateAsInt(Result, S.Context, Expr::SE_AllowSideEffects))
          S.Diag(ExprLoc, diag::warn_left_shift_always)
              << (Result.Val.getInt() != 0);
        else if (E->getType()->isSignedIntegerType())
          S.Diag(ExprLoc, diag::warn_left_shift_in_bool_context) << E;
      }
    }
  
    if (const auto *CO = dyn_cast<ConditionalOperator>(E)) {
      const auto *LHS = getIntegerLiteral(CO->getTrueExpr());
      const auto *RHS = getIntegerLiteral(CO->getFalseExpr());
      if (!LHS || !RHS)
        return;
      if ((LHS->getValue() == 0 || LHS->getValue() == 1) &&
          (RHS->getValue() == 0 || RHS->getValue() == 1))
        // Do not diagnose common idioms.
        return;
      if (LHS->getValue() != 0 && RHS->getValue() != 0)
        S.Diag(ExprLoc, diag::warn_integer_constants_in_conditional_always_true);
    }
  }
  
  static void CheckImplicitConversion(Sema &S, Expr *E, QualType T,
                                      SourceLocation CC,
                                      bool *ICContext = nullptr,
                                      bool IsListInit = false) {
    if (E->isTypeDependent() || E->isValueDependent()) return;
  
    const Type *Source = S.Context.getCanonicalType(E->getType()).getTypePtr();
    const Type *Target = S.Context.getCanonicalType(T).getTypePtr();
    if (Source == Target) return;
    if (Target->isDependentType()) return;
  
    // If the conversion context location is invalid don't complain. We also
    // don't want to emit a warning if the issue occurs from the expansion of
    // a system macro. The problem is that 'getSpellingLoc()' is slow, so we
    // delay this check as long as possible. Once we detect we are in that
    // scenario, we just return.
    if (CC.isInvalid())
      return;
  
    if (Source->isAtomicType())
      S.Diag(E->getExprLoc(), diag::warn_atomic_implicit_seq_cst);
  
    // Diagnose implicit casts to bool.
    if (Target->isSpecificBuiltinType(BuiltinType::Bool)) {
      if (isa<StringLiteral>(E))
        // Warn on string literal to bool.  Checks for string literals in logical
        // and expressions, for instance, assert(0 && "error here"), are
        // prevented by a check in AnalyzeImplicitConversions().
        return DiagnoseImpCast(S, E, T, CC,
                               diag::warn_impcast_string_literal_to_bool);
      if (isa<ObjCStringLiteral>(E) || isa<ObjCArrayLiteral>(E) ||
          isa<ObjCDictionaryLiteral>(E) || isa<ObjCBoxedExpr>(E)) {
        // This covers the literal expressions that evaluate to Objective-C
        // objects.
        return DiagnoseImpCast(S, E, T, CC,
                               diag::warn_impcast_objective_c_literal_to_bool);
      }
      if (Source->isPointerType() || Source->canDecayToPointerType()) {
        // Warn on pointer to bool conversion that is always true.
        S.DiagnoseAlwaysNonNullPointer(E, Expr::NPCK_NotNull, /*IsEqual*/ false,
                                       SourceRange(CC));
      }
    }
  
    // If the we're converting a constant to an ObjC BOOL on a platform where BOOL
    // is a typedef for signed char (macOS), then that constant value has to be 1
    // or 0.
    if (isObjCSignedCharBool(S, T) && Source->isIntegralType(S.Context)) {
      Expr::EvalResult Result;
      if (E->EvaluateAsInt(Result, S.getASTContext(),
                           Expr::SE_AllowSideEffects)) {
        if (Result.Val.getInt() != 1 && Result.Val.getInt() != 0) {
          adornObjCBoolConversionDiagWithTernaryFixit(
              S, E,
              S.Diag(CC, diag::warn_impcast_constant_value_to_objc_bool)
                  << Result.Val.getInt().toString(10));
        }
        return;
      }
    }
  
    // Check implicit casts from Objective-C collection literals to specialized
    // collection types, e.g., NSArray<NSString *> *.
    if (auto *ArrayLiteral = dyn_cast<ObjCArrayLiteral>(E))
      checkObjCArrayLiteral(S, QualType(Target, 0), ArrayLiteral);
    else if (auto *DictionaryLiteral = dyn_cast<ObjCDictionaryLiteral>(E))
      checkObjCDictionaryLiteral(S, QualType(Target, 0), DictionaryLiteral);
  
    // Strip vector types.
    if (isa<VectorType>(Source)) {
      if (!isa<VectorType>(Target)) {
        if (S.SourceMgr.isInSystemMacro(CC))
          return;
        return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_vector_scalar);
      }
  
      // If the vector cast is cast between two vectors of the same size, it is
      // a bitcast, not a conversion.
      if (S.Context.getTypeSize(Source) == S.Context.getTypeSize(Target))
        return;
  
      Source = cast<VectorType>(Source)->getElementType().getTypePtr();
      Target = cast<VectorType>(Target)->getElementType().getTypePtr();
    }
    if (auto VecTy = dyn_cast<VectorType>(Target))
      Target = VecTy->getElementType().getTypePtr();
  
    // Strip complex types.
    if (isa<ComplexType>(Source)) {
      if (!isa<ComplexType>(Target)) {
        if (S.SourceMgr.isInSystemMacro(CC) || Target->isBooleanType())
          return;
  
        return DiagnoseImpCast(S, E, T, CC,
                               S.getLangOpts().CPlusPlus
                                   ? diag::err_impcast_complex_scalar
                                   : diag::warn_impcast_complex_scalar);
      }
  
      Source = cast<ComplexType>(Source)->getElementType().getTypePtr();
      Target = cast<ComplexType>(Target)->getElementType().getTypePtr();
    }
  
    const BuiltinType *SourceBT = dyn_cast<BuiltinType>(Source);
    const BuiltinType *TargetBT = dyn_cast<BuiltinType>(Target);
  
    // If the source is floating point...
    if (SourceBT && SourceBT->isFloatingPoint()) {
      // ...and the target is floating point...
      if (TargetBT && TargetBT->isFloatingPoint()) {
        // ...then warn if we're dropping FP rank.
  
        int Order = S.getASTContext().getFloatingTypeSemanticOrder(
            QualType(SourceBT, 0), QualType(TargetBT, 0));
        if (Order > 0) {
          // Don't warn about float constants that are precisely
          // representable in the target type.
          Expr::EvalResult result;
          if (E->EvaluateAsRValue(result, S.Context)) {
            // Value might be a float, a float vector, or a float complex.
            if (IsSameFloatAfterCast(result.Val,
                     S.Context.getFloatTypeSemantics(QualType(TargetBT, 0)),
                     S.Context.getFloatTypeSemantics(QualType(SourceBT, 0))))
              return;
          }
  
          if (S.SourceMgr.isInSystemMacro(CC))
            return;
  
          DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_float_precision);
        }
        // ... or possibly if we're increasing rank, too
        else if (Order < 0) {
          if (S.SourceMgr.isInSystemMacro(CC))
            return;
  
          DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_double_promotion);
        }
        return;
      }
  
      // If the target is integral, always warn.
      if (TargetBT && TargetBT->isInteger()) {
        if (S.SourceMgr.isInSystemMacro(CC))
          return;
  
        DiagnoseFloatingImpCast(S, E, T, CC);
      }
  
      // Detect the case where a call result is converted from floating-point to
      // to bool, and the final argument to the call is converted from bool, to
      // discover this typo:
      //
      //    bool b = fabs(x < 1.0);  // should be "bool b = fabs(x) < 1.0;"
      //
      // FIXME: This is an incredibly special case; is there some more general
      // way to detect this class of misplaced-parentheses bug?
      if (Target->isBooleanType() && isa<CallExpr>(E)) {
        // Check last argument of function call to see if it is an
        // implicit cast from a type matching the type the result
        // is being cast to.
        CallExpr *CEx = cast<CallExpr>(E);
        if (unsigned NumArgs = CEx->getNumArgs()) {
          Expr *LastA = CEx->getArg(NumArgs - 1);
          Expr *InnerE = LastA->IgnoreParenImpCasts();
          if (isa<ImplicitCastExpr>(LastA) &&
              InnerE->getType()->isBooleanType()) {
            // Warn on this floating-point to bool conversion
            DiagnoseImpCast(S, E, T, CC,
                            diag::warn_impcast_floating_point_to_bool);
          }
        }
      }
      return;
    }
  
    // Valid casts involving fixed point types should be accounted for here.
    if (Source->isFixedPointType()) {
      if (Target->isUnsaturatedFixedPointType()) {
        Expr::EvalResult Result;
        if (E->EvaluateAsFixedPoint(Result, S.Context, Expr::SE_AllowSideEffects,
                                    S.isConstantEvaluated())) {
          APFixedPoint Value = Result.Val.getFixedPoint();
          APFixedPoint MaxVal = S.Context.getFixedPointMax(T);
          APFixedPoint MinVal = S.Context.getFixedPointMin(T);
          if (Value > MaxVal || Value < MinVal) {
            S.DiagRuntimeBehavior(E->getExprLoc(), E,
                                  S.PDiag(diag::warn_impcast_fixed_point_range)
                                      << Value.toString() << T
                                      << E->getSourceRange()
                                      << clang::SourceRange(CC));
            return;
          }
        }
      } else if (Target->isIntegerType()) {
        Expr::EvalResult Result;
        if (!S.isConstantEvaluated() &&
            E->EvaluateAsFixedPoint(Result, S.Context,
                                    Expr::SE_AllowSideEffects)) {
          APFixedPoint FXResult = Result.Val.getFixedPoint();
  
          bool Overflowed;
          llvm::APSInt IntResult = FXResult.convertToInt(
              S.Context.getIntWidth(T),
              Target->isSignedIntegerOrEnumerationType(), &Overflowed);
  
          if (Overflowed) {
            S.DiagRuntimeBehavior(E->getExprLoc(), E,
                                  S.PDiag(diag::warn_impcast_fixed_point_range)
                                      << FXResult.toString() << T
                                      << E->getSourceRange()
                                      << clang::SourceRange(CC));
            return;
          }
        }
      }
    } else if (Target->isUnsaturatedFixedPointType()) {
      if (Source->isIntegerType()) {
        Expr::EvalResult Result;
        if (!S.isConstantEvaluated() &&
            E->EvaluateAsInt(Result, S.Context, Expr::SE_AllowSideEffects)) {
          llvm::APSInt Value = Result.Val.getInt();
  
          bool Overflowed;
          APFixedPoint IntResult = APFixedPoint::getFromIntValue(
              Value, S.Context.getFixedPointSemantics(T), &Overflowed);
  
          if (Overflowed) {
            S.DiagRuntimeBehavior(E->getExprLoc(), E,
                                  S.PDiag(diag::warn_impcast_fixed_point_range)
                                      << Value.toString(/*Radix=*/10) << T
                                      << E->getSourceRange()
                                      << clang::SourceRange(CC));
            return;
          }
        }
      }
    }
  
    // If we are casting an integer type to a floating point type without
    // initialization-list syntax, we might lose accuracy if the floating
    // point type has a narrower significand than the integer type.
    if (SourceBT && TargetBT && SourceBT->isIntegerType() &&
        TargetBT->isFloatingType() && !IsListInit) {
      // Determine the number of precision bits in the source integer type.
      IntRange SourceRange = GetExprRange(S.Context, E, S.isConstantEvaluated());
      unsigned int SourcePrecision = SourceRange.Width;
  
      // Determine the number of precision bits in the
      // target floating point type.
      unsigned int TargetPrecision = llvm::APFloatBase::semanticsPrecision(
          S.Context.getFloatTypeSemantics(QualType(TargetBT, 0)));
  
      if (SourcePrecision > 0 && TargetPrecision > 0 &&
          SourcePrecision > TargetPrecision) {
  
        llvm::APSInt SourceInt;
        if (E->isIntegerConstantExpr(SourceInt, S.Context)) {
          // If the source integer is a constant, convert it to the target
          // floating point type. Issue a warning if the value changes
          // during the whole conversion.
          llvm::APFloat TargetFloatValue(
              S.Context.getFloatTypeSemantics(QualType(TargetBT, 0)));
          llvm::APFloat::opStatus ConversionStatus =
              TargetFloatValue.convertFromAPInt(
                  SourceInt, SourceBT->isSignedInteger(),
                  llvm::APFloat::rmNearestTiesToEven);
  
          if (ConversionStatus != llvm::APFloat::opOK) {
            std::string PrettySourceValue = SourceInt.toString(10);
            SmallString<32> PrettyTargetValue;
            TargetFloatValue.toString(PrettyTargetValue, TargetPrecision);
  
            S.DiagRuntimeBehavior(
                E->getExprLoc(), E,
                S.PDiag(diag::warn_impcast_integer_float_precision_constant)
                    << PrettySourceValue << PrettyTargetValue << E->getType() << T
                    << E->getSourceRange() << clang::SourceRange(CC));
          }
        } else {
          // Otherwise, the implicit conversion may lose precision.
          DiagnoseImpCast(S, E, T, CC,
                          diag::warn_impcast_integer_float_precision);
        }
      }
    }
  
    DiagnoseNullConversion(S, E, T, CC);
  
    S.DiscardMisalignedMemberAddress(Target, E);
  
    if (Target->isBooleanType())
      DiagnoseIntInBoolContext(S, E);
  
    if (!Source->isIntegerType() || !Target->isIntegerType())
      return;
  
    // TODO: remove this early return once the false positives for constant->bool
    // in templates, macros, etc, are reduced or removed.
    if (Target->isSpecificBuiltinType(BuiltinType::Bool))
      return;
  
    if (isObjCSignedCharBool(S, T) && !Source->isCharType() &&
        !E->isKnownToHaveBooleanValue(/*Semantic=*/false)) {
      return adornObjCBoolConversionDiagWithTernaryFixit(
          S, E,
          S.Diag(CC, diag::warn_impcast_int_to_objc_signed_char_bool)
              << E->getType());
    }
  
    IntRange SourceRange = GetExprRange(S.Context, E, S.isConstantEvaluated());
    IntRange TargetRange = IntRange::forTargetOfCanonicalType(S.Context, Target);
  
    if (SourceRange.Width > TargetRange.Width) {
      // If the source is a constant, use a default-on diagnostic.
      // TODO: this should happen for bitfield stores, too.
      Expr::EvalResult Result;
      if (E->EvaluateAsInt(Result, S.Context, Expr::SE_AllowSideEffects,
                           S.isConstantEvaluated())) {
        llvm::APSInt Value(32);
        Value = Result.Val.getInt();
  
        if (S.SourceMgr.isInSystemMacro(CC))
          return;
  
        std::string PrettySourceValue = Value.toString(10);
        std::string PrettyTargetValue = PrettyPrintInRange(Value, TargetRange);
  
        S.DiagRuntimeBehavior(
            E->getExprLoc(), E,
            S.PDiag(diag::warn_impcast_integer_precision_constant)
                << PrettySourceValue << PrettyTargetValue << E->getType() << T
                << E->getSourceRange() << clang::SourceRange(CC));
        return;
      }
  
      // People want to build with -Wshorten-64-to-32 and not -Wconversion.
      if (S.SourceMgr.isInSystemMacro(CC))
        return;
  
      if (TargetRange.Width == 32 && S.Context.getIntWidth(E->getType()) == 64)
        return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_integer_64_32,
                               /* pruneControlFlow */ true);
      return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_integer_precision);
    }
  
    if (TargetRange.Width > SourceRange.Width) {
      if (auto *UO = dyn_cast<UnaryOperator>(E))
        if (UO->getOpcode() == UO_Minus)
          if (Source->isUnsignedIntegerType()) {
            if (Target->isUnsignedIntegerType())
              return DiagnoseImpCast(S, E, T, CC,
                                     diag::warn_impcast_high_order_zero_bits);
            if (Target->isSignedIntegerType())
              return DiagnoseImpCast(S, E, T, CC,
                                     diag::warn_impcast_nonnegative_result);
          }
    }
  
    if (TargetRange.Width == SourceRange.Width && !TargetRange.NonNegative &&
        SourceRange.NonNegative && Source->isSignedIntegerType()) {
      // Warn when doing a signed to signed conversion, warn if the positive
      // source value is exactly the width of the target type, which will
      // cause a negative value to be stored.
  
      Expr::EvalResult Result;
      if (E->EvaluateAsInt(Result, S.Context, Expr::SE_AllowSideEffects) &&
          !S.SourceMgr.isInSystemMacro(CC)) {
        llvm::APSInt Value = Result.Val.getInt();
        if (isSameWidthConstantConversion(S, E, T, CC)) {
          std::string PrettySourceValue = Value.toString(10);
          std::string PrettyTargetValue = PrettyPrintInRange(Value, TargetRange);
  
          S.DiagRuntimeBehavior(
              E->getExprLoc(), E,
              S.PDiag(diag::warn_impcast_integer_precision_constant)
                  << PrettySourceValue << PrettyTargetValue << E->getType() << T
                  << E->getSourceRange() << clang::SourceRange(CC));
          return;
        }
      }
  
      // Fall through for non-constants to give a sign conversion warning.
    }
  
    if ((TargetRange.NonNegative && !SourceRange.NonNegative) ||
        (!TargetRange.NonNegative && SourceRange.NonNegative &&
         SourceRange.Width == TargetRange.Width)) {
      if (S.SourceMgr.isInSystemMacro(CC))
        return;
  
      unsigned DiagID = diag::warn_impcast_integer_sign;
  
      // Traditionally, gcc has warned about this under -Wsign-compare.
      // We also want to warn about it in -Wconversion.
      // So if -Wconversion is off, use a completely identical diagnostic
      // in the sign-compare group.
      // The conditional-checking code will
      if (ICContext) {
        DiagID = diag::warn_impcast_integer_sign_conditional;
        *ICContext = true;
      }
  
      return DiagnoseImpCast(S, E, T, CC, DiagID);
    }
  
    // Diagnose conversions between different enumeration types.
    // In C, we pretend that the type of an EnumConstantDecl is its enumeration
    // type, to give us better diagnostics.
    QualType SourceType = E->getType();
    if (!S.getLangOpts().CPlusPlus) {
      if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
        if (EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(DRE->getDecl())) {
          EnumDecl *Enum = cast<EnumDecl>(ECD->getDeclContext());
          SourceType = S.Context.getTypeDeclType(Enum);
          Source = S.Context.getCanonicalType(SourceType).getTypePtr();
        }
    }
  
    if (const EnumType *SourceEnum = Source->getAs<EnumType>())
      if (const EnumType *TargetEnum = Target->getAs<EnumType>())
        if (SourceEnum->getDecl()->hasNameForLinkage() &&
            TargetEnum->getDecl()->hasNameForLinkage() &&
            SourceEnum != TargetEnum) {
          if (S.SourceMgr.isInSystemMacro(CC))
            return;
  
          return DiagnoseImpCast(S, E, SourceType, T, CC,
                                 diag::warn_impcast_different_enum_types);
        }
  }
  
  static void CheckConditionalOperator(Sema &S, ConditionalOperator *E,
                                       SourceLocation CC, QualType T);
  
  static void CheckConditionalOperand(Sema &S, Expr *E, QualType T,
                                      SourceLocation CC, bool &ICContext) {
    E = E->IgnoreParenImpCasts();
  
    if (isa<ConditionalOperator>(E))
      return CheckConditionalOperator(S, cast<ConditionalOperator>(E), CC, T);
  
    AnalyzeImplicitConversions(S, E, CC);
    if (E->getType() != T)
      return CheckImplicitConversion(S, E, T, CC, &ICContext);
  }
  
  static void CheckConditionalOperator(Sema &S, ConditionalOperator *E,
                                       SourceLocation CC, QualType T) {
    AnalyzeImplicitConversions(S, E->getCond(), E->getQuestionLoc());
  
    bool Suspicious = false;
    CheckConditionalOperand(S, E->getTrueExpr(), T, CC, Suspicious);
    CheckConditionalOperand(S, E->getFalseExpr(), T, CC, Suspicious);
  
    if (T->isBooleanType())
      DiagnoseIntInBoolContext(S, E);
  
    // If -Wconversion would have warned about either of the candidates
    // for a signedness conversion to the context type...
    if (!Suspicious) return;
  
    // ...but it's currently ignored...
    if (!S.Diags.isIgnored(diag::warn_impcast_integer_sign_conditional, CC))
      return;
  
    // ...then check whether it would have warned about either of the
    // candidates for a signedness conversion to the condition type.
    if (E->getType() == T) return;
  
    Suspicious = false;
    CheckImplicitConversion(S, E->getTrueExpr()->IgnoreParenImpCasts(),
                            E->getType(), CC, &Suspicious);
    if (!Suspicious)
      CheckImplicitConversion(S, E->getFalseExpr()->IgnoreParenImpCasts(),
                              E->getType(), CC, &Suspicious);
  }
  
  /// Check conversion of given expression to boolean.
  /// Input argument E is a logical expression.
  static void CheckBoolLikeConversion(Sema &S, Expr *E, SourceLocation CC) {
    if (S.getLangOpts().Bool)
      return;
    if (E->IgnoreParenImpCasts()->getType()->isAtomicType())
      return;
    CheckImplicitConversion(S, E->IgnoreParenImpCasts(), S.Context.BoolTy, CC);
  }
  
  /// AnalyzeImplicitConversions - Find and report any interesting
  /// implicit conversions in the given expression.  There are a couple
  /// of competing diagnostics here, -Wconversion and -Wsign-compare.
  static void AnalyzeImplicitConversions(Sema &S, Expr *OrigE, SourceLocation CC,
                                         bool IsListInit/*= false*/) {
    QualType T = OrigE->getType();
    Expr *E = OrigE->IgnoreParenImpCasts();
  
    // Propagate whether we are in a C++ list initialization expression.
    // If so, we do not issue warnings for implicit int-float conversion
    // precision loss, because C++11 narrowing already handles it.
    IsListInit =
        IsListInit || (isa<InitListExpr>(OrigE) && S.getLangOpts().CPlusPlus);
  
    if (E->isTypeDependent() || E->isValueDependent())
      return;
  
    Expr *SourceExpr = E;
    // Examine, but don't traverse into the source expression of an
    // OpaqueValueExpr, since it may have multiple parents and we don't want to
    // emit duplicate diagnostics. Its fine to examine the form or attempt to
    // evaluate it in the context of checking the specific conversion to T though.
    if (auto *OVE = dyn_cast<OpaqueValueExpr>(E))
      if (auto *Src = OVE->getSourceExpr())
        SourceExpr = Src;
  
    if (const auto *UO = dyn_cast<UnaryOperator>(SourceExpr))
      if (UO->getOpcode() == UO_Not &&
          UO->getSubExpr()->isKnownToHaveBooleanValue())
        S.Diag(UO->getBeginLoc(), diag::warn_bitwise_negation_bool)
            << OrigE->getSourceRange() << T->isBooleanType()
            << FixItHint::CreateReplacement(UO->getBeginLoc(), "!");
  
    // For conditional operators, we analyze the arguments as if they
    // were being fed directly into the output.
    if (auto *CO = dyn_cast<ConditionalOperator>(SourceExpr)) {
      CheckConditionalOperator(S, CO, CC, T);
      return;
    }
  
    // Check implicit argument conversions for function calls.
    if (CallExpr *Call = dyn_cast<CallExpr>(SourceExpr))
      CheckImplicitArgumentConversions(S, Call, CC);
  
    // Go ahead and check any implicit conversions we might have skipped.
    // The non-canonical typecheck is just an optimization;
    // CheckImplicitConversion will filter out dead implicit conversions.
    if (SourceExpr->getType() != T)
      CheckImplicitConversion(S, SourceExpr, T, CC, nullptr, IsListInit);
  
    // Now continue drilling into this expression.
  
    if (PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(E)) {
      // The bound subexpressions in a PseudoObjectExpr are not reachable
      // as transitive children.
      // FIXME: Use a more uniform representation for this.
      for (auto *SE : POE->semantics())
        if (auto *OVE = dyn_cast<OpaqueValueExpr>(SE))
          AnalyzeImplicitConversions(S, OVE->getSourceExpr(), CC, IsListInit);
    }
  
    // Skip past explicit casts.
    if (auto *CE = dyn_cast<ExplicitCastExpr>(E)) {
      E = CE->getSubExpr()->IgnoreParenImpCasts();
      if (!CE->getType()->isVoidType() && E->getType()->isAtomicType())
        S.Diag(E->getBeginLoc(), diag::warn_atomic_implicit_seq_cst);
      return AnalyzeImplicitConversions(S, E, CC, IsListInit);
    }
  
    if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
      // Do a somewhat different check with comparison operators.
      if (BO->isComparisonOp())
        return AnalyzeComparison(S, BO);
  
      // And with simple assignments.
      if (BO->getOpcode() == BO_Assign)
        return AnalyzeAssignment(S, BO);
      // And with compound assignments.
      if (BO->isAssignmentOp())
        return AnalyzeCompoundAssignment(S, BO);
    }
  
    // These break the otherwise-useful invariant below.  Fortunately,
    // we don't really need to recurse into them, because any internal
    // expressions should have been analyzed already when they were
    // built into statements.
    if (isa<StmtExpr>(E)) return;
  
    // Don't descend into unevaluated contexts.
    if (isa<UnaryExprOrTypeTraitExpr>(E)) return;
  
    // Now just recurse over the expression's children.
    CC = E->getExprLoc();
    BinaryOperator *BO = dyn_cast<BinaryOperator>(E);
    bool IsLogicalAndOperator = BO && BO->getOpcode() == BO_LAnd;
    for (Stmt *SubStmt : E->children()) {
      Expr *ChildExpr = dyn_cast_or_null<Expr>(SubStmt);
      if (!ChildExpr)
        continue;
  
      if (IsLogicalAndOperator &&
          isa<StringLiteral>(ChildExpr->IgnoreParenImpCasts()))
        // Ignore checking string literals that are in logical and operators.
        // This is a common pattern for asserts.
        continue;
      AnalyzeImplicitConversions(S, ChildExpr, CC, IsListInit);
    }
  
    if (BO && BO->isLogicalOp()) {
      Expr *SubExpr = BO->getLHS()->IgnoreParenImpCasts();
      if (!IsLogicalAndOperator || !isa<StringLiteral>(SubExpr))
        ::CheckBoolLikeConversion(S, SubExpr, BO->getExprLoc());
  
      SubExpr = BO->getRHS()->IgnoreParenImpCasts();
      if (!IsLogicalAndOperator || !isa<StringLiteral>(SubExpr))
        ::CheckBoolLikeConversion(S, SubExpr, BO->getExprLoc());
    }
  
    if (const UnaryOperator *U = dyn_cast<UnaryOperator>(E)) {
      if (U->getOpcode() == UO_LNot) {
        ::CheckBoolLikeConversion(S, U->getSubExpr(), CC);
      } else if (U->getOpcode() != UO_AddrOf) {
        if (U->getSubExpr()->getType()->isAtomicType())
          S.Diag(U->getSubExpr()->getBeginLoc(),
                 diag::warn_atomic_implicit_seq_cst);
      }
    }
  }
  
  /// Diagnose integer type and any valid implicit conversion to it.
  static bool checkOpenCLEnqueueIntType(Sema &S, Expr *E, const QualType &IntT) {
    // Taking into account implicit conversions,
    // allow any integer.
    if (!E->getType()->isIntegerType()) {
      S.Diag(E->getBeginLoc(),
             diag::err_opencl_enqueue_kernel_invalid_local_size_type);
      return true;
    }
    // Potentially emit standard warnings for implicit conversions if enabled
    // using -Wconversion.
    CheckImplicitConversion(S, E, IntT, E->getBeginLoc());
    return false;
  }
  
  // Helper function for Sema::DiagnoseAlwaysNonNullPointer.
  // Returns true when emitting a warning about taking the address of a reference.
  static bool CheckForReference(Sema &SemaRef, const Expr *E,
                                const PartialDiagnostic &PD) {
    E = E->IgnoreParenImpCasts();
  
    const FunctionDecl *FD = nullptr;
  
    if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
      if (!DRE->getDecl()->getType()->isReferenceType())
        return false;
    } else if (const MemberExpr *M = dyn_cast<MemberExpr>(E)) {
      if (!M->getMemberDecl()->getType()->isReferenceType())
        return false;
    } else if (const CallExpr *Call = dyn_cast<CallExpr>(E)) {
      if (!Call->getCallReturnType(SemaRef.Context)->isReferenceType())
        return false;
      FD = Call->getDirectCallee();
    } else {
      return false;
    }
  
    SemaRef.Diag(E->getExprLoc(), PD);
  
    // If possible, point to location of function.
    if (FD) {
      SemaRef.Diag(FD->getLocation(), diag::note_reference_is_return_value) << FD;
    }
  
    return true;
  }
  
  // Returns true if the SourceLocation is expanded from any macro body.
  // Returns false if the SourceLocation is invalid, is from not in a macro
  // expansion, or is from expanded from a top-level macro argument.
  static bool IsInAnyMacroBody(const SourceManager &SM, SourceLocation Loc) {
    if (Loc.isInvalid())
      return false;
  
    while (Loc.isMacroID()) {
      if (SM.isMacroBodyExpansion(Loc))
        return true;
      Loc = SM.getImmediateMacroCallerLoc(Loc);
    }
  
    return false;
  }
  
  /// Diagnose pointers that are always non-null.
  /// \param E the expression containing the pointer
  /// \param NullKind NPCK_NotNull if E is a cast to bool, otherwise, E is
  /// compared to a null pointer
  /// \param IsEqual True when the comparison is equal to a null pointer
  /// \param Range Extra SourceRange to highlight in the diagnostic
  void Sema::DiagnoseAlwaysNonNullPointer(Expr *E,
                                          Expr::NullPointerConstantKind NullKind,
                                          bool IsEqual, SourceRange Range) {
    if (!E)
      return;
  
    // Don't warn inside macros.
    if (E->getExprLoc().isMacroID()) {
      const SourceManager &SM = getSourceManager();
      if (IsInAnyMacroBody(SM, E->getExprLoc()) ||
          IsInAnyMacroBody(SM, Range.getBegin()))
        return;
    }
    E = E->IgnoreImpCasts();
  
    const bool IsCompare = NullKind != Expr::NPCK_NotNull;
  
    if (isa<CXXThisExpr>(E)) {
      unsigned DiagID = IsCompare ? diag::warn_this_null_compare
                                  : diag::warn_this_bool_conversion;
      Diag(E->getExprLoc(), DiagID) << E->getSourceRange() << Range << IsEqual;
      return;
    }
  
    bool IsAddressOf = false;
  
    if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
      if (UO->getOpcode() != UO_AddrOf)
        return;
      IsAddressOf = true;
      E = UO->getSubExpr();
    }
  
    if (IsAddressOf) {
      unsigned DiagID = IsCompare
                            ? diag::warn_address_of_reference_null_compare
                            : diag::warn_address_of_reference_bool_conversion;
      PartialDiagnostic PD = PDiag(DiagID) << E->getSourceRange() << Range
                                           << IsEqual;
      if (CheckForReference(*this, E, PD)) {
        return;
      }
    }
  
    auto ComplainAboutNonnullParamOrCall = [&](const Attr *NonnullAttr) {
      bool IsParam = isa<NonNullAttr>(NonnullAttr);
      std::string Str;
      llvm::raw_string_ostream S(Str);
      E->printPretty(S, nullptr, getPrintingPolicy());
      unsigned DiagID = IsCompare ? diag::warn_nonnull_expr_compare
                                  : diag::warn_cast_nonnull_to_bool;
      Diag(E->getExprLoc(), DiagID) << IsParam << S.str()
        << E->getSourceRange() << Range << IsEqual;
      Diag(NonnullAttr->getLocation(), diag::note_declared_nonnull) << IsParam;
    };
  
    // If we have a CallExpr that is tagged with returns_nonnull, we can complain.
    if (auto *Call = dyn_cast<CallExpr>(E->IgnoreParenImpCasts())) {
      if (auto *Callee = Call->getDirectCallee()) {
        if (const Attr *A = Callee->getAttr<ReturnsNonNullAttr>()) {
          ComplainAboutNonnullParamOrCall(A);
          return;
        }
      }
    }
  
    // Expect to find a single Decl.  Skip anything more complicated.
    ValueDecl *D = nullptr;
    if (DeclRefExpr *R = dyn_cast<DeclRefExpr>(E)) {
      D = R->getDecl();
    } else if (MemberExpr *M = dyn_cast<MemberExpr>(E)) {
      D = M->getMemberDecl();
    }
  
    // Weak Decls can be null.
    if (!D || D->isWeak())
      return;
  
    // Check for parameter decl with nonnull attribute
    if (const auto* PV = dyn_cast<ParmVarDecl>(D)) {
      if (getCurFunction() &&
          !getCurFunction()->ModifiedNonNullParams.count(PV)) {
        if (const Attr *A = PV->getAttr<NonNullAttr>()) {
          ComplainAboutNonnullParamOrCall(A);
          return;
        }
  
        if (const auto *FD = dyn_cast<FunctionDecl>(PV->getDeclContext())) {
          // Skip function template not specialized yet.
          if (FD->getTemplatedKind() == FunctionDecl::TK_FunctionTemplate)
            return;
          auto ParamIter = llvm::find(FD->parameters(), PV);
          assert(ParamIter != FD->param_end());
          unsigned ParamNo = std::distance(FD->param_begin(), ParamIter);
  
          for (const auto *NonNull : FD->specific_attrs<NonNullAttr>()) {
            if (!NonNull->args_size()) {
                ComplainAboutNonnullParamOrCall(NonNull);
                return;
            }
  
            for (const ParamIdx &ArgNo : NonNull->args()) {
              if (ArgNo.getASTIndex() == ParamNo) {
                ComplainAboutNonnullParamOrCall(NonNull);
                return;
              }
            }
          }
        }
      }
    }
  
    QualType T = D->getType();
    const bool IsArray = T->isArrayType();
    const bool IsFunction = T->isFunctionType();
  
    // Address of function is used to silence the function warning.
    if (IsAddressOf && IsFunction) {
      return;
    }
  
    // Found nothing.
    if (!IsAddressOf && !IsFunction && !IsArray)
      return;
  
    // Pretty print the expression for the diagnostic.
    std::string Str;
    llvm::raw_string_ostream S(Str);
    E->printPretty(S, nullptr, getPrintingPolicy());
  
    unsigned DiagID = IsCompare ? diag::warn_null_pointer_compare
                                : diag::warn_impcast_pointer_to_bool;
    enum {
      AddressOf,
      FunctionPointer,
      ArrayPointer
    } DiagType;
    if (IsAddressOf)
      DiagType = AddressOf;
    else if (IsFunction)
      DiagType = FunctionPointer;
    else if (IsArray)
      DiagType = ArrayPointer;
    else
      llvm_unreachable("Could not determine diagnostic.");
    Diag(E->getExprLoc(), DiagID) << DiagType << S.str() << E->getSourceRange()
                                  << Range << IsEqual;
  
    if (!IsFunction)
      return;
  
    // Suggest '&' to silence the function warning.
    Diag(E->getExprLoc(), diag::note_function_warning_silence)
        << FixItHint::CreateInsertion(E->getBeginLoc(), "&");
  
    // Check to see if '()' fixit should be emitted.
    QualType ReturnType;
    UnresolvedSet<4> NonTemplateOverloads;
    tryExprAsCall(*E, ReturnType, NonTemplateOverloads);
    if (ReturnType.isNull())
      return;
  
    if (IsCompare) {
      // There are two cases here.  If there is null constant, the only suggest
      // for a pointer return type.  If the null is 0, then suggest if the return
      // type is a pointer or an integer type.
      if (!ReturnType->isPointerType()) {
        if (NullKind == Expr::NPCK_ZeroExpression ||
            NullKind == Expr::NPCK_ZeroLiteral) {
          if (!ReturnType->isIntegerType())
            return;
        } else {
          return;
        }
      }
    } else { // !IsCompare
      // For function to bool, only suggest if the function pointer has bool
      // return type.
      if (!ReturnType->isSpecificBuiltinType(BuiltinType::Bool))
        return;
    }
    Diag(E->getExprLoc(), diag::note_function_to_function_call)
        << FixItHint::CreateInsertion(getLocForEndOfToken(E->getEndLoc()), "()");
  }
  
  /// Diagnoses "dangerous" implicit conversions within the given
  /// expression (which is a full expression).  Implements -Wconversion
  /// and -Wsign-compare.
  ///
  /// \param CC the "context" location of the implicit conversion, i.e.
  ///   the most location of the syntactic entity requiring the implicit
  ///   conversion
  void Sema::CheckImplicitConversions(Expr *E, SourceLocation CC) {
    // Don't diagnose in unevaluated contexts.
    if (isUnevaluatedContext())
      return;
  
    // Don't diagnose for value- or type-dependent expressions.
    if (E->isTypeDependent() || E->isValueDependent())
      return;
  
    // Check for array bounds violations in cases where the check isn't triggered
    // elsewhere for other Expr types (like BinaryOperators), e.g. when an
    // ArraySubscriptExpr is on the RHS of a variable initialization.
    CheckArrayAccess(E);
  
    // This is not the right CC for (e.g.) a variable initialization.
    AnalyzeImplicitConversions(*this, E, CC);
  }
  
  /// CheckBoolLikeConversion - Check conversion of given expression to boolean.
  /// Input argument E is a logical expression.
  void Sema::CheckBoolLikeConversion(Expr *E, SourceLocation CC) {
    ::CheckBoolLikeConversion(*this, E, CC);
  }
  
  /// Diagnose when expression is an integer constant expression and its evaluation
  /// results in integer overflow
  void Sema::CheckForIntOverflow (Expr *E) {
    // Use a work list to deal with nested struct initializers.
    SmallVector<Expr *, 2> Exprs(1, E);
  
    do {
      Expr *OriginalE = Exprs.pop_back_val();
      Expr *E = OriginalE->IgnoreParenCasts();
  
      if (isa<BinaryOperator>(E)) {
        E->EvaluateForOverflow(Context);
        continue;
      }
  
      if (auto InitList = dyn_cast<InitListExpr>(OriginalE))
        Exprs.append(InitList->inits().begin(), InitList->inits().end());
      else if (isa<ObjCBoxedExpr>(OriginalE))
        E->EvaluateForOverflow(Context);
      else if (auto Call = dyn_cast<CallExpr>(E))
        Exprs.append(Call->arg_begin(), Call->arg_end());
      else if (auto Message = dyn_cast<ObjCMessageExpr>(E))
        Exprs.append(Message->arg_begin(), Message->arg_end());
    } while (!Exprs.empty());
  }
  
  namespace {
  
  /// Visitor for expressions which looks for unsequenced operations on the
  /// same object.
  class SequenceChecker : public ConstEvaluatedExprVisitor<SequenceChecker> {
    using Base = ConstEvaluatedExprVisitor<SequenceChecker>;
  
    /// A tree of sequenced regions within an expression. Two regions are
    /// unsequenced if one is an ancestor or a descendent of the other. When we
    /// finish processing an expression with sequencing, such as a comma
    /// expression, we fold its tree nodes into its parent, since they are
    /// unsequenced with respect to nodes we will visit later.
    class SequenceTree {
      struct Value {
        explicit Value(unsigned Parent) : Parent(Parent), Merged(false) {}
        unsigned Parent : 31;
        unsigned Merged : 1;
      };
      SmallVector<Value, 8> Values;
  
    public:
      /// A region within an expression which may be sequenced with respect
      /// to some other region.
      class Seq {
        friend class SequenceTree;
  
        unsigned Index;
  
        explicit Seq(unsigned N) : Index(N) {}
  
      public:
        Seq() : Index(0) {}
      };
  
      SequenceTree() { Values.push_back(Value(0)); }
      Seq root() const { return Seq(0); }
  
      /// Create a new sequence of operations, which is an unsequenced
      /// subset of \p Parent. This sequence of operations is sequenced with
      /// respect to other children of \p Parent.
      Seq allocate(Seq Parent) {
        Values.push_back(Value(Parent.Index));
        return Seq(Values.size() - 1);
      }
  
      /// Merge a sequence of operations into its parent.
      void merge(Seq S) {
        Values[S.Index].Merged = true;
      }
  
      /// Determine whether two operations are unsequenced. This operation
      /// is asymmetric: \p Cur should be the more recent sequence, and \p Old
      /// should have been merged into its parent as appropriate.
      bool isUnsequenced(Seq Cur, Seq Old) {
        unsigned C = representative(Cur.Index);
        unsigned Target = representative(Old.Index);
        while (C >= Target) {
          if (C == Target)
            return true;
          C = Values[C].Parent;
        }
        return false;
      }
  
    private:
      /// Pick a representative for a sequence.
      unsigned representative(unsigned K) {
        if (Values[K].Merged)
          // Perform path compression as we go.
          return Values[K].Parent = representative(Values[K].Parent);
        return K;
      }
    };
  
    /// An object for which we can track unsequenced uses.
    using Object = const NamedDecl *;
  
    /// Different flavors of object usage which we track. We only track the
    /// least-sequenced usage of each kind.
    enum UsageKind {
      /// A read of an object. Multiple unsequenced reads are OK.
      UK_Use,
  
      /// A modification of an object which is sequenced before the value
      /// computation of the expression, such as ++n in C++.
      UK_ModAsValue,
  
      /// A modification of an object which is not sequenced before the value
      /// computation of the expression, such as n++.
      UK_ModAsSideEffect,
  
      UK_Count = UK_ModAsSideEffect + 1
    };
  
    /// Bundle together a sequencing region and the expression corresponding
    /// to a specific usage. One Usage is stored for each usage kind in UsageInfo.
    struct Usage {
      const Expr *UsageExpr;
      SequenceTree::Seq Seq;
  
      Usage() : UsageExpr(nullptr), Seq() {}
    };
  
    struct UsageInfo {
      Usage Uses[UK_Count];
  
      /// Have we issued a diagnostic for this object already?
      bool Diagnosed;
  
      UsageInfo() : Uses(), Diagnosed(false) {}
    };
    using UsageInfoMap = llvm::SmallDenseMap<Object, UsageInfo, 16>;
  
    Sema &SemaRef;
  
    /// Sequenced regions within the expression.
    SequenceTree Tree;
  
    /// Declaration modifications and references which we have seen.
    UsageInfoMap UsageMap;
  
    /// The region we are currently within.
    SequenceTree::Seq Region;
  
    /// Filled in with declarations which were modified as a side-effect
    /// (that is, post-increment operations).
    SmallVectorImpl<std::pair<Object, Usage>> *ModAsSideEffect = nullptr;
  
    /// Expressions to check later. We defer checking these to reduce
    /// stack usage.
    SmallVectorImpl<const Expr *> &WorkList;
  
    /// RAII object wrapping the visitation of a sequenced subexpression of an
    /// expression. At the end of this process, the side-effects of the evaluation
    /// become sequenced with respect to the value computation of the result, so
    /// we downgrade any UK_ModAsSideEffect within the evaluation to
    /// UK_ModAsValue.
    struct SequencedSubexpression {
      SequencedSubexpression(SequenceChecker &Self)
        : Self(Self), OldModAsSideEffect(Self.ModAsSideEffect) {
        Self.ModAsSideEffect = &ModAsSideEffect;
      }
  
      ~SequencedSubexpression() {
        for (const std::pair<Object, Usage> &M : llvm::reverse(ModAsSideEffect)) {
          // Add a new usage with usage kind UK_ModAsValue, and then restore
          // the previous usage with UK_ModAsSideEffect (thus clearing it if
          // the previous one was empty).
          UsageInfo &UI = Self.UsageMap[M.first];
          auto &SideEffectUsage = UI.Uses[UK_ModAsSideEffect];
          Self.addUsage(M.first, UI, SideEffectUsage.UsageExpr, UK_ModAsValue);
          SideEffectUsage = M.second;
        }
        Self.ModAsSideEffect = OldModAsSideEffect;
      }
  
      SequenceChecker &Self;
      SmallVector<std::pair<Object, Usage>, 4> ModAsSideEffect;
      SmallVectorImpl<std::pair<Object, Usage>> *OldModAsSideEffect;
    };
  
    /// RAII object wrapping the visitation of a subexpression which we might
    /// choose to evaluate as a constant. If any subexpression is evaluated and
    /// found to be non-constant, this allows us to suppress the evaluation of
    /// the outer expression.
    class EvaluationTracker {
    public:
      EvaluationTracker(SequenceChecker &Self)
          : Self(Self), Prev(Self.EvalTracker) {
        Self.EvalTracker = this;
      }
  
      ~EvaluationTracker() {
        Self.EvalTracker = Prev;
        if (Prev)
          Prev->EvalOK &= EvalOK;
      }
  
      bool evaluate(const Expr *E, bool &Result) {
        if (!EvalOK || E->isValueDependent())
          return false;
        EvalOK = E->EvaluateAsBooleanCondition(
            Result, Self.SemaRef.Context, Self.SemaRef.isConstantEvaluated());
        return EvalOK;
      }
  
    private:
      SequenceChecker &Self;
      EvaluationTracker *Prev;
      bool EvalOK = true;
    } *EvalTracker = nullptr;
  
    /// Find the object which is produced by the specified expression,
    /// if any.
    Object getObject(const Expr *E, bool Mod) const {
      E = E->IgnoreParenCasts();
      if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
        if (Mod && (UO->getOpcode() == UO_PreInc || UO->getOpcode() == UO_PreDec))
          return getObject(UO->getSubExpr(), Mod);
      } else if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
        if (BO->getOpcode() == BO_Comma)
          return getObject(BO->getRHS(), Mod);
        if (Mod && BO->isAssignmentOp())
          return getObject(BO->getLHS(), Mod);
      } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
        // FIXME: Check for more interesting cases, like "x.n = ++x.n".
        if (isa<CXXThisExpr>(ME->getBase()->IgnoreParenCasts()))
          return ME->getMemberDecl();
      } else if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
        // FIXME: If this is a reference, map through to its value.
        return DRE->getDecl();
      return nullptr;
    }
  
    /// Note that an object \p O was modified or used by an expression
    /// \p UsageExpr with usage kind \p UK. \p UI is the \p UsageInfo for
    /// the object \p O as obtained via the \p UsageMap.
    void addUsage(Object O, UsageInfo &UI, const Expr *UsageExpr, UsageKind UK) {
      // Get the old usage for the given object and usage kind.
      Usage &U = UI.Uses[UK];
      if (!U.UsageExpr || !Tree.isUnsequenced(Region, U.Seq)) {
        // If we have a modification as side effect and are in a sequenced
        // subexpression, save the old Usage so that we can restore it later
        // in SequencedSubexpression::~SequencedSubexpression.
        if (UK == UK_ModAsSideEffect && ModAsSideEffect)
          ModAsSideEffect->push_back(std::make_pair(O, U));
        // Then record the new usage with the current sequencing region.
        U.UsageExpr = UsageExpr;
        U.Seq = Region;
      }
    }
  
    /// Check whether a modification or use of an object \p O in an expression
    /// \p UsageExpr conflicts with a prior usage of kind \p OtherKind. \p UI is
    /// the \p UsageInfo for the object \p O as obtained via the \p UsageMap.
    /// \p IsModMod is true when we are checking for a mod-mod unsequenced
    /// usage and false we are checking for a mod-use unsequenced usage.
    void checkUsage(Object O, UsageInfo &UI, const Expr *UsageExpr,
                    UsageKind OtherKind, bool IsModMod) {
      if (UI.Diagnosed)
        return;
  
      const Usage &U = UI.Uses[OtherKind];
      if (!U.UsageExpr || !Tree.isUnsequenced(Region, U.Seq))
        return;
  
      const Expr *Mod = U.UsageExpr;
      const Expr *ModOrUse = UsageExpr;
      if (OtherKind == UK_Use)
        std::swap(Mod, ModOrUse);
  
      SemaRef.DiagRuntimeBehavior(
          Mod->getExprLoc(), {Mod, ModOrUse},
          SemaRef.PDiag(IsModMod ? diag::warn_unsequenced_mod_mod
                                 : diag::warn_unsequenced_mod_use)
              << O << SourceRange(ModOrUse->getExprLoc()));
      UI.Diagnosed = true;
    }
  
    // A note on note{Pre, Post}{Use, Mod}:
    //
    // (It helps to follow the algorithm with an expression such as
    //  "((++k)++, k) = k" or "k = (k++, k++)". Both contain unsequenced
    //  operations before C++17 and both are well-defined in C++17).
    //
    // When visiting a node which uses/modify an object we first call notePreUse
    // or notePreMod before visiting its sub-expression(s). At this point the
    // children of the current node have not yet been visited and so the eventual
    // uses/modifications resulting from the children of the current node have not
    // been recorded yet.
    //
    // We then visit the children of the current node. After that notePostUse or
    // notePostMod is called. These will 1) detect an unsequenced modification
    // as side effect (as in "k++ + k") and 2) add a new usage with the
    // appropriate usage kind.
    //
    // We also have to be careful that some operation sequences modification as
    // side effect as well (for example: || or ,). To account for this we wrap
    // the visitation of such a sub-expression (for example: the LHS of || or ,)
    // with SequencedSubexpression. SequencedSubexpression is an RAII object
    // which record usages which are modifications as side effect, and then
    // downgrade them (or more accurately restore the previous usage which was a
    // modification as side effect) when exiting the scope of the sequenced
    // subexpression.
  
    void notePreUse(Object O, const Expr *UseExpr) {
      UsageInfo &UI = UsageMap[O];
      // Uses conflict with other modifications.
      checkUsage(O, UI, UseExpr, /*OtherKind=*/UK_ModAsValue, /*IsModMod=*/false);
    }
  
    void notePostUse(Object O, const Expr *UseExpr) {
      UsageInfo &UI = UsageMap[O];
      checkUsage(O, UI, UseExpr, /*OtherKind=*/UK_ModAsSideEffect,
                 /*IsModMod=*/false);
      addUsage(O, UI, UseExpr, /*UsageKind=*/UK_Use);
    }
  
    void notePreMod(Object O, const Expr *ModExpr) {
      UsageInfo &UI = UsageMap[O];
      // Modifications conflict with other modifications and with uses.
      checkUsage(O, UI, ModExpr, /*OtherKind=*/UK_ModAsValue, /*IsModMod=*/true);
      checkUsage(O, UI, ModExpr, /*OtherKind=*/UK_Use, /*IsModMod=*/false);
    }
  
    void notePostMod(Object O, const Expr *ModExpr, UsageKind UK) {
      UsageInfo &UI = UsageMap[O];
      checkUsage(O, UI, ModExpr, /*OtherKind=*/UK_ModAsSideEffect,
                 /*IsModMod=*/true);
      addUsage(O, UI, ModExpr, /*UsageKind=*/UK);
    }
  
  public:
    SequenceChecker(Sema &S, const Expr *E,
                    SmallVectorImpl<const Expr *> &WorkList)
        : Base(S.Context), SemaRef(S), Region(Tree.root()), WorkList(WorkList) {
      Visit(E);
      // Silence a -Wunused-private-field since WorkList is now unused.
      // TODO: Evaluate if it can be used, and if not remove it.
      (void)this->WorkList;
    }
  
    void VisitStmt(const Stmt *S) {
      // Skip all statements which aren't expressions for now.
    }
  
    void VisitExpr(const Expr *E) {
      // By default, just recurse to evaluated subexpressions.
      Base::VisitStmt(E);
    }
  
    void VisitCastExpr(const CastExpr *E) {
      Object O = Object();
      if (E->getCastKind() == CK_LValueToRValue)
        O = getObject(E->getSubExpr(), false);
  
      if (O)
        notePreUse(O, E);
      VisitExpr(E);
      if (O)
        notePostUse(O, E);
    }
  
    void VisitSequencedExpressions(const Expr *SequencedBefore,
                                   const Expr *SequencedAfter) {
      SequenceTree::Seq BeforeRegion = Tree.allocate(Region);
      SequenceTree::Seq AfterRegion = Tree.allocate(Region);
      SequenceTree::Seq OldRegion = Region;
  
      {
        SequencedSubexpression SeqBefore(*this);
        Region = BeforeRegion;
        Visit(SequencedBefore);
      }
  
      Region = AfterRegion;
      Visit(SequencedAfter);
  
      Region = OldRegion;
  
      Tree.merge(BeforeRegion);
      Tree.merge(AfterRegion);
    }
  
    void VisitArraySubscriptExpr(const ArraySubscriptExpr *ASE) {
      // C++17 [expr.sub]p1:
      //   The expression E1[E2] is identical (by definition) to *((E1)+(E2)). The
      //   expression E1 is sequenced before the expression E2.
      if (SemaRef.getLangOpts().CPlusPlus17)
        VisitSequencedExpressions(ASE->getLHS(), ASE->getRHS());
      else {
        Visit(ASE->getLHS());
        Visit(ASE->getRHS());
      }
    }
  
    void VisitBinPtrMemD(const BinaryOperator *BO) { VisitBinPtrMem(BO); }
    void VisitBinPtrMemI(const BinaryOperator *BO) { VisitBinPtrMem(BO); }
    void VisitBinPtrMem(const BinaryOperator *BO) {
      // C++17 [expr.mptr.oper]p4:
      //  Abbreviating pm-expression.*cast-expression as E1.*E2, [...]
      //  the expression E1 is sequenced before the expression E2.
      if (SemaRef.getLangOpts().CPlusPlus17)
        VisitSequencedExpressions(BO->getLHS(), BO->getRHS());
      else {
        Visit(BO->getLHS());
        Visit(BO->getRHS());
      }
    }
  
    void VisitBinShl(const BinaryOperator *BO) { VisitBinShlShr(BO); }
    void VisitBinShr(const BinaryOperator *BO) { VisitBinShlShr(BO); }
    void VisitBinShlShr(const BinaryOperator *BO) {
      // C++17 [expr.shift]p4:
      //  The expression E1 is sequenced before the expression E2.
      if (SemaRef.getLangOpts().CPlusPlus17)
        VisitSequencedExpressions(BO->getLHS(), BO->getRHS());
      else {
        Visit(BO->getLHS());
        Visit(BO->getRHS());
      }
    }
  
    void VisitBinComma(const BinaryOperator *BO) {
      // C++11 [expr.comma]p1:
      //   Every value computation and side effect associated with the left
      //   expression is sequenced before every value computation and side
      //   effect associated with the right expression.
      VisitSequencedExpressions(BO->getLHS(), BO->getRHS());
    }
  
    void VisitBinAssign(const BinaryOperator *BO) {
      SequenceTree::Seq RHSRegion;
      SequenceTree::Seq LHSRegion;
      if (SemaRef.getLangOpts().CPlusPlus17) {
        RHSRegion = Tree.allocate(Region);
        LHSRegion = Tree.allocate(Region);
      } else {
        RHSRegion = Region;
        LHSRegion = Region;
      }
      SequenceTree::Seq OldRegion = Region;
  
      // C++11 [expr.ass]p1:
      //  [...] the assignment is sequenced after the value computation
      //  of the right and left operands, [...]
      //
      // so check it before inspecting the operands and update the
      // map afterwards.
      Object O = getObject(BO->getLHS(), /*Mod=*/true);
      if (O)
        notePreMod(O, BO);
  
      if (SemaRef.getLangOpts().CPlusPlus17) {
        // C++17 [expr.ass]p1:
        //  [...] The right operand is sequenced before the left operand. [...]
        {
          SequencedSubexpression SeqBefore(*this);
          Region = RHSRegion;
          Visit(BO->getRHS());
        }
  
        Region = LHSRegion;
        Visit(BO->getLHS());
  
        if (O && isa<CompoundAssignOperator>(BO))
          notePostUse(O, BO);
  
      } else {
        // C++11 does not specify any sequencing between the LHS and RHS.
        Region = LHSRegion;
        Visit(BO->getLHS());
  
        if (O && isa<CompoundAssignOperator>(BO))
          notePostUse(O, BO);
  
        Region = RHSRegion;
        Visit(BO->getRHS());
      }
  
      // C++11 [expr.ass]p1:
      //  the assignment is sequenced [...] before the value computation of the
      //  assignment expression.
      // C11 6.5.16/3 has no such rule.
      Region = OldRegion;
      if (O)
        notePostMod(O, BO,
                    SemaRef.getLangOpts().CPlusPlus ? UK_ModAsValue
                                                    : UK_ModAsSideEffect);
      if (SemaRef.getLangOpts().CPlusPlus17) {
        Tree.merge(RHSRegion);
        Tree.merge(LHSRegion);
      }
    }
  
    void VisitCompoundAssignOperator(const CompoundAssignOperator *CAO) {
      VisitBinAssign(CAO);
    }
  
    void VisitUnaryPreInc(const UnaryOperator *UO) { VisitUnaryPreIncDec(UO); }
    void VisitUnaryPreDec(const UnaryOperator *UO) { VisitUnaryPreIncDec(UO); }
    void VisitUnaryPreIncDec(const UnaryOperator *UO) {
      Object O = getObject(UO->getSubExpr(), true);
      if (!O)
        return VisitExpr(UO);
  
      notePreMod(O, UO);
      Visit(UO->getSubExpr());
      // C++11 [expr.pre.incr]p1:
      //   the expression ++x is equivalent to x+=1
      notePostMod(O, UO,
                  SemaRef.getLangOpts().CPlusPlus ? UK_ModAsValue
                                                  : UK_ModAsSideEffect);
    }
  
    void VisitUnaryPostInc(const UnaryOperator *UO) { VisitUnaryPostIncDec(UO); }
    void VisitUnaryPostDec(const UnaryOperator *UO) { VisitUnaryPostIncDec(UO); }
    void VisitUnaryPostIncDec(const UnaryOperator *UO) {
      Object O = getObject(UO->getSubExpr(), true);
      if (!O)
        return VisitExpr(UO);
  
      notePreMod(O, UO);
      Visit(UO->getSubExpr());
      notePostMod(O, UO, UK_ModAsSideEffect);
    }
  
    void VisitBinLOr(const BinaryOperator *BO) {
      // C++11 [expr.log.or]p2:
      //  If the second expression is evaluated, every value computation and
      //  side effect associated with the first expression is sequenced before
      //  every value computation and side effect associated with the
      //  second expression.
      SequenceTree::Seq LHSRegion = Tree.allocate(Region);
      SequenceTree::Seq RHSRegion = Tree.allocate(Region);
      SequenceTree::Seq OldRegion = Region;
  
      EvaluationTracker Eval(*this);
      {
        SequencedSubexpression Sequenced(*this);
        Region = LHSRegion;
        Visit(BO->getLHS());
      }
  
      // C++11 [expr.log.or]p1:
      //  [...] the second operand is not evaluated if the first operand
      //  evaluates to true.
      bool EvalResult = false;
      bool EvalOK = Eval.evaluate(BO->getLHS(), EvalResult);
      bool ShouldVisitRHS = !EvalOK || (EvalOK && !EvalResult);
      if (ShouldVisitRHS) {
        Region = RHSRegion;
        Visit(BO->getRHS());
      }
  
      Region = OldRegion;
      Tree.merge(LHSRegion);
      Tree.merge(RHSRegion);
    }
  
    void VisitBinLAnd(const BinaryOperator *BO) {
      // C++11 [expr.log.and]p2:
      //  If the second expression is evaluated, every value computation and
      //  side effect associated with the first expression is sequenced before
      //  every value computation and side effect associated with the
      //  second expression.
      SequenceTree::Seq LHSRegion = Tree.allocate(Region);
      SequenceTree::Seq RHSRegion = Tree.allocate(Region);
      SequenceTree::Seq OldRegion = Region;
  
      EvaluationTracker Eval(*this);
      {
        SequencedSubexpression Sequenced(*this);
        Region = LHSRegion;
        Visit(BO->getLHS());
      }
  
      // C++11 [expr.log.and]p1:
      //  [...] the second operand is not evaluated if the first operand is false.
      bool EvalResult = false;
      bool EvalOK = Eval.evaluate(BO->getLHS(), EvalResult);
      bool ShouldVisitRHS = !EvalOK || (EvalOK && EvalResult);
      if (ShouldVisitRHS) {
        Region = RHSRegion;
        Visit(BO->getRHS());
      }
  
      Region = OldRegion;
      Tree.merge(LHSRegion);
      Tree.merge(RHSRegion);
    }
  
    void VisitAbstractConditionalOperator(const AbstractConditionalOperator *CO) {
      // C++11 [expr.cond]p1:
      //  [...] Every value computation and side effect associated with the first
      //  expression is sequenced before every value computation and side effect
      //  associated with the second or third expression.
      SequenceTree::Seq ConditionRegion = Tree.allocate(Region);
  
      // No sequencing is specified between the true and false expression.
      // However since exactly one of both is going to be evaluated we can
      // consider them to be sequenced. This is needed to avoid warning on
      // something like "x ? y+= 1 : y += 2;" in the case where we will visit
      // both the true and false expressions because we can't evaluate x.
      // This will still allow us to detect an expression like (pre C++17)
      // "(x ? y += 1 : y += 2) = y".
      //
      // We don't wrap the visitation of the true and false expression with
      // SequencedSubexpression because we don't want to downgrade modifications
      // as side effect in the true and false expressions after the visition
      // is done. (for example in the expression "(x ? y++ : y++) + y" we should
      // not warn between the two "y++", but we should warn between the "y++"
      // and the "y".
      SequenceTree::Seq TrueRegion = Tree.allocate(Region);
      SequenceTree::Seq FalseRegion = Tree.allocate(Region);
      SequenceTree::Seq OldRegion = Region;
  
      EvaluationTracker Eval(*this);
      {
        SequencedSubexpression Sequenced(*this);
        Region = ConditionRegion;
        Visit(CO->getCond());
      }
  
      // C++11 [expr.cond]p1:
      // [...] The first expression is contextually converted to bool (Clause 4).
      // It is evaluated and if it is true, the result of the conditional
      // expression is the value of the second expression, otherwise that of the
      // third expression. Only one of the second and third expressions is
      // evaluated. [...]
      bool EvalResult = false;
      bool EvalOK = Eval.evaluate(CO->getCond(), EvalResult);
      bool ShouldVisitTrueExpr = !EvalOK || (EvalOK && EvalResult);
      bool ShouldVisitFalseExpr = !EvalOK || (EvalOK && !EvalResult);
      if (ShouldVisitTrueExpr) {
        Region = TrueRegion;
        Visit(CO->getTrueExpr());
      }
      if (ShouldVisitFalseExpr) {
        Region = FalseRegion;
        Visit(CO->getFalseExpr());
      }
  
      Region = OldRegion;
      Tree.merge(ConditionRegion);
      Tree.merge(TrueRegion);
      Tree.merge(FalseRegion);
    }
  
    void VisitCallExpr(const CallExpr *CE) {
      // C++11 [intro.execution]p15:
      //   When calling a function [...], every value computation and side effect
      //   associated with any argument expression, or with the postfix expression
      //   designating the called function, is sequenced before execution of every
      //   expression or statement in the body of the function [and thus before
      //   the value computation of its result].
      SequencedSubexpression Sequenced(*this);
      SemaRef.runWithSufficientStackSpace(CE->getExprLoc(),
                                          [&] { Base::VisitCallExpr(CE); });
  
      // FIXME: CXXNewExpr and CXXDeleteExpr implicitly call functions.
    }
  
    void VisitCXXConstructExpr(const CXXConstructExpr *CCE) {
      // This is a call, so all subexpressions are sequenced before the result.
      SequencedSubexpression Sequenced(*this);
  
      if (!CCE->isListInitialization())
        return VisitExpr(CCE);
  
      // In C++11, list initializations are sequenced.
      SmallVector<SequenceTree::Seq, 32> Elts;
      SequenceTree::Seq Parent = Region;
      for (CXXConstructExpr::const_arg_iterator I = CCE->arg_begin(),
                                                E = CCE->arg_end();
           I != E; ++I) {
        Region = Tree.allocate(Parent);
        Elts.push_back(Region);
        Visit(*I);
      }
  
      // Forget that the initializers are sequenced.
      Region = Parent;
      for (unsigned I = 0; I < Elts.size(); ++I)
        Tree.merge(Elts[I]);
    }
  
    void VisitInitListExpr(const InitListExpr *ILE) {
      if (!SemaRef.getLangOpts().CPlusPlus11)
        return VisitExpr(ILE);
  
      // In C++11, list initializations are sequenced.
      SmallVector<SequenceTree::Seq, 32> Elts;
      SequenceTree::Seq Parent = Region;
      for (unsigned I = 0; I < ILE->getNumInits(); ++I) {
        const Expr *E = ILE->getInit(I);
        if (!E)
          continue;
        Region = Tree.allocate(Parent);
        Elts.push_back(Region);
        Visit(E);
      }
  
      // Forget that the initializers are sequenced.
      Region = Parent;
      for (unsigned I = 0; I < Elts.size(); ++I)
        Tree.merge(Elts[I]);
    }
  };
  
  } // namespace
  
  void Sema::CheckUnsequencedOperations(const Expr *E) {
    SmallVector<const Expr *, 8> WorkList;
    WorkList.push_back(E);
    while (!WorkList.empty()) {
      const Expr *Item = WorkList.pop_back_val();
      SequenceChecker(*this, Item, WorkList);
    }
  }
  
  void Sema::CheckCompletedExpr(Expr *E, SourceLocation CheckLoc,
                                bool IsConstexpr) {
    llvm::SaveAndRestore<bool> ConstantContext(
        isConstantEvaluatedOverride, IsConstexpr || isa<ConstantExpr>(E));
    CheckImplicitConversions(E, CheckLoc);
    if (!E->isInstantiationDependent())
      CheckUnsequencedOperations(E);
    if (!IsConstexpr && !E->isValueDependent())
      CheckForIntOverflow(E);
    DiagnoseMisalignedMembers();
  }
  
  void Sema::CheckBitFieldInitialization(SourceLocation InitLoc,
                                         FieldDecl *BitField,
                                         Expr *Init) {
    (void) AnalyzeBitFieldAssignment(*this, BitField, Init, InitLoc);
  }
  
  static void diagnoseArrayStarInParamType(Sema &S, QualType PType,
                                           SourceLocation Loc) {
    if (!PType->isVariablyModifiedType())
      return;
    if (const auto *PointerTy = dyn_cast<PointerType>(PType)) {
      diagnoseArrayStarInParamType(S, PointerTy->getPointeeType(), Loc);
      return;
    }
    if (const auto *ReferenceTy = dyn_cast<ReferenceType>(PType)) {
      diagnoseArrayStarInParamType(S, ReferenceTy->getPointeeType(), Loc);
      return;
    }
    if (const auto *ParenTy = dyn_cast<ParenType>(PType)) {
      diagnoseArrayStarInParamType(S, ParenTy->getInnerType(), Loc);
      return;
    }
  
    const ArrayType *AT = S.Context.getAsArrayType(PType);
    if (!AT)
      return;
  
    if (AT->getSizeModifier() != ArrayType::Star) {
      diagnoseArrayStarInParamType(S, AT->getElementType(), Loc);
      return;
    }
  
    S.Diag(Loc, diag::err_array_star_in_function_definition);
  }
  
  /// CheckParmsForFunctionDef - Check that the parameters of the given
  /// function are appropriate for the definition of a function. This
  /// takes care of any checks that cannot be performed on the
  /// declaration itself, e.g., that the types of each of the function
  /// parameters are complete.
  bool Sema::CheckParmsForFunctionDef(ArrayRef<ParmVarDecl *> Parameters,
                                      bool CheckParameterNames) {
    bool HasInvalidParm = false;
    for (ParmVarDecl *Param : Parameters) {
      // C99 6.7.5.3p4: the parameters in a parameter type list in a
      // function declarator that is part of a function definition of
      // that function shall not have incomplete type.
      //
      // This is also C++ [dcl.fct]p6.
      if (!Param->isInvalidDecl() &&
          RequireCompleteType(Param->getLocation(), Param->getType(),
                              diag::err_typecheck_decl_incomplete_type)) {
        Param->setInvalidDecl();
        HasInvalidParm = true;
      }
  
      // C99 6.9.1p5: If the declarator includes a parameter type list, the
      // declaration of each parameter shall include an identifier.
      if (CheckParameterNames &&
          Param->getIdentifier() == nullptr &&
          !Param->isImplicit() &&
          !getLangOpts().CPlusPlus)
        Diag(Param->getLocation(), diag::err_parameter_name_omitted);
  
      // C99 6.7.5.3p12:
      //   If the function declarator is not part of a definition of that
      //   function, parameters may have incomplete type and may use the [*]
      //   notation in their sequences of declarator specifiers to specify
      //   variable length array types.
      QualType PType = Param->getOriginalType();
      // FIXME: This diagnostic should point the '[*]' if source-location
      // information is added for it.
      diagnoseArrayStarInParamType(*this, PType, Param->getLocation());
  
      // If the parameter is a c++ class type and it has to be destructed in the
      // callee function, declare the destructor so that it can be called by the
      // callee function. Do not perform any direct access check on the dtor here.
      if (!Param->isInvalidDecl()) {
        if (CXXRecordDecl *ClassDecl = Param->getType()->getAsCXXRecordDecl()) {
          if (!ClassDecl->isInvalidDecl() &&
              !ClassDecl->hasIrrelevantDestructor() &&
              !ClassDecl->isDependentContext() &&
              ClassDecl->isParamDestroyedInCallee()) {
            CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl);
            MarkFunctionReferenced(Param->getLocation(), Destructor);
            DiagnoseUseOfDecl(Destructor, Param->getLocation());
          }
        }
      }
  
      // Parameters with the pass_object_size attribute only need to be marked
      // constant at function definitions. Because we lack information about
      // whether we're on a declaration or definition when we're instantiating the
      // attribute, we need to check for constness here.
      if (const auto *Attr = Param->getAttr<PassObjectSizeAttr>())
        if (!Param->getType().isConstQualified())
          Diag(Param->getLocation(), diag::err_attribute_pointers_only)
              << Attr->getSpelling() << 1;
  
      // Check for parameter names shadowing fields from the class.
      if (LangOpts.CPlusPlus && !Param->isInvalidDecl()) {
        // The owning context for the parameter should be the function, but we
        // want to see if this function's declaration context is a record.
        DeclContext *DC = Param->getDeclContext();
        if (DC && DC->isFunctionOrMethod()) {
          if (auto *RD = dyn_cast<CXXRecordDecl>(DC->getParent()))
            CheckShadowInheritedFields(Param->getLocation(), Param->getDeclName(),
                                       RD, /*DeclIsField*/ false);
        }
      }
    }
  
    return HasInvalidParm;
  }
  
  Optional<std::pair<CharUnits, CharUnits>>
  static getBaseAlignmentAndOffsetFromPtr(const Expr *E, ASTContext &Ctx);
  
  /// Compute the alignment and offset of the base class object given the
  /// derived-to-base cast expression and the alignment and offset of the derived
  /// class object.
  static std::pair<CharUnits, CharUnits>
  getDerivedToBaseAlignmentAndOffset(const CastExpr *CE, QualType DerivedType,
                                     CharUnits BaseAlignment, CharUnits Offset,
                                     ASTContext &Ctx) {
    for (auto PathI = CE->path_begin(), PathE = CE->path_end(); PathI != PathE;
         ++PathI) {
      const CXXBaseSpecifier *Base = *PathI;
      const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl();
      if (Base->isVirtual()) {
        // The complete object may have a lower alignment than the non-virtual
        // alignment of the base, in which case the base may be misaligned. Choose
        // the smaller of the non-virtual alignment and BaseAlignment, which is a
        // conservative lower bound of the complete object alignment.
        CharUnits NonVirtualAlignment =
            Ctx.getASTRecordLayout(BaseDecl).getNonVirtualAlignment();
        BaseAlignment = std::min(BaseAlignment, NonVirtualAlignment);
        Offset = CharUnits::Zero();
      } else {
        const ASTRecordLayout &RL =
            Ctx.getASTRecordLayout(DerivedType->getAsCXXRecordDecl());
        Offset += RL.getBaseClassOffset(BaseDecl);
      }
      DerivedType = Base->getType();
    }
  
    return std::make_pair(BaseAlignment, Offset);
  }
  
  /// Compute the alignment and offset of a binary additive operator.
  static Optional<std::pair<CharUnits, CharUnits>>
  getAlignmentAndOffsetFromBinAddOrSub(const Expr *PtrE, const Expr *IntE,
                                       bool IsSub, ASTContext &Ctx) {
    QualType PointeeType = PtrE->getType()->getPointeeType();
  
    if (!PointeeType->isConstantSizeType())
      return llvm::None;
  
    auto P = getBaseAlignmentAndOffsetFromPtr(PtrE, Ctx);
  
    if (!P)
      return llvm::None;
  
    llvm::APSInt IdxRes;
    CharUnits EltSize = Ctx.getTypeSizeInChars(PointeeType);
    if (IntE->isIntegerConstantExpr(IdxRes, Ctx)) {
      CharUnits Offset = EltSize * IdxRes.getExtValue();
      if (IsSub)
        Offset = -Offset;
      return std::make_pair(P->first, P->second + Offset);
    }
  
    // If the integer expression isn't a constant expression, compute the lower
    // bound of the alignment using the alignment and offset of the pointer
    // expression and the element size.
    return std::make_pair(
        P->first.alignmentAtOffset(P->second).alignmentAtOffset(EltSize),
        CharUnits::Zero());
  }
  
  /// This helper function takes an lvalue expression and returns the alignment of
  /// a VarDecl and a constant offset from the VarDecl.
  Optional<std::pair<CharUnits, CharUnits>>
  static getBaseAlignmentAndOffsetFromLValue(const Expr *E, ASTContext &Ctx) {
    E = E->IgnoreParens();
    switch (E->getStmtClass()) {
    default:
      break;
    case Stmt::CStyleCastExprClass:
    case Stmt::CXXStaticCastExprClass:
    case Stmt::ImplicitCastExprClass: {
      auto *CE = cast<CastExpr>(E);
      const Expr *From = CE->getSubExpr();
      switch (CE->getCastKind()) {
      default:
        break;
      case CK_NoOp:
        return getBaseAlignmentAndOffsetFromLValue(From, Ctx);
      case CK_UncheckedDerivedToBase:
      case CK_DerivedToBase: {
        auto P = getBaseAlignmentAndOffsetFromLValue(From, Ctx);
        if (!P)
          break;
        return getDerivedToBaseAlignmentAndOffset(CE, From->getType(), P->first,
                                                  P->second, Ctx);
      }
      }
      break;
    }
    case Stmt::ArraySubscriptExprClass: {
      auto *ASE = cast<ArraySubscriptExpr>(E);
      return getAlignmentAndOffsetFromBinAddOrSub(ASE->getBase(), ASE->getIdx(),
                                                  false, Ctx);
    }
    case Stmt::DeclRefExprClass: {
      if (auto *VD = dyn_cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl())) {
        // FIXME: If VD is captured by copy or is an escaping __block variable,
        // use the alignment of VD's type.
        if (!VD->getType()->isReferenceType())
          return std::make_pair(Ctx.getDeclAlign(VD), CharUnits::Zero());
        if (VD->hasInit())
          return getBaseAlignmentAndOffsetFromLValue(VD->getInit(), Ctx);
      }
      break;
    }
    case Stmt::MemberExprClass: {
      auto *ME = cast<MemberExpr>(E);
      if (ME->isArrow())
        break;
      auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl());
      if (!FD || FD->getType()->isReferenceType())
        break;
      auto P = getBaseAlignmentAndOffsetFromLValue(ME->getBase(), Ctx);
      if (!P)
        break;
      const ASTRecordLayout &Layout = Ctx.getASTRecordLayout(FD->getParent());
      uint64_t Offset = Layout.getFieldOffset(FD->getFieldIndex());
      return std::make_pair(P->first,
                            P->second + CharUnits::fromQuantity(Offset));
    }
    case Stmt::UnaryOperatorClass: {
      auto *UO = cast<UnaryOperator>(E);
      switch (UO->getOpcode()) {
      default:
        break;
      case UO_Deref:
        return getBaseAlignmentAndOffsetFromPtr(UO->getSubExpr(), Ctx);
      }
      break;
    }
    case Stmt::BinaryOperatorClass: {
      auto *BO = cast<BinaryOperator>(E);
      auto Opcode = BO->getOpcode();
      switch (Opcode) {
      default:
        break;
      case BO_Comma:
        return getBaseAlignmentAndOffsetFromLValue(BO->getRHS(), Ctx);
      }
      break;
    }
    }
    return llvm::None;
  }
  
  /// This helper function takes a pointer expression and returns the alignment of
  /// a VarDecl and a constant offset from the VarDecl.
  Optional<std::pair<CharUnits, CharUnits>>
  static getBaseAlignmentAndOffsetFromPtr(const Expr *E, ASTContext &Ctx) {
    E = E->IgnoreParens();
    switch (E->getStmtClass()) {
    default:
      break;
    case Stmt::CStyleCastExprClass:
    case Stmt::CXXStaticCastExprClass:
    case Stmt::ImplicitCastExprClass: {
      auto *CE = cast<CastExpr>(E);
      const Expr *From = CE->getSubExpr();
      switch (CE->getCastKind()) {
      default:
        break;
      case CK_NoOp:
        return getBaseAlignmentAndOffsetFromPtr(From, Ctx);
      case CK_ArrayToPointerDecay:
        return getBaseAlignmentAndOffsetFromLValue(From, Ctx);
      case CK_UncheckedDerivedToBase:
      case CK_DerivedToBase: {
        auto P = getBaseAlignmentAndOffsetFromPtr(From, Ctx);
        if (!P)
          break;
        return getDerivedToBaseAlignmentAndOffset(
            CE, From->getType()->getPointeeType(), P->first, P->second, Ctx);
      }
      }
      break;
    }
    case Stmt::UnaryOperatorClass: {
      auto *UO = cast<UnaryOperator>(E);
      if (UO->getOpcode() == UO_AddrOf)
        return getBaseAlignmentAndOffsetFromLValue(UO->getSubExpr(), Ctx);
      break;
    }
    case Stmt::BinaryOperatorClass: {
      auto *BO = cast<BinaryOperator>(E);
      auto Opcode = BO->getOpcode();
      switch (Opcode) {
      default:
        break;
      case BO_Add:
      case BO_Sub: {
        const Expr *LHS = BO->getLHS(), *RHS = BO->getRHS();
        if (Opcode == BO_Add && !RHS->getType()->isIntegralOrEnumerationType())
          std::swap(LHS, RHS);
        return getAlignmentAndOffsetFromBinAddOrSub(LHS, RHS, Opcode == BO_Sub,
                                                    Ctx);
      }
      case BO_Comma:
        return getBaseAlignmentAndOffsetFromPtr(BO->getRHS(), Ctx);
      }
      break;
    }
    }
    return llvm::None;
  }
  
  static CharUnits getPresumedAlignmentOfPointer(const Expr *E, Sema &S) {
    // See if we can compute the alignment of a VarDecl and an offset from it.
    Optional<std::pair<CharUnits, CharUnits>> P =
        getBaseAlignmentAndOffsetFromPtr(E, S.Context);
  
    if (P)
      return P->first.alignmentAtOffset(P->second);
  
    // If that failed, return the type's alignment.
    return S.Context.getTypeAlignInChars(E->getType()->getPointeeType());
  }
  
  /// CheckCastAlign - Implements -Wcast-align, which warns when a
  /// pointer cast increases the alignment requirements.
  void Sema::CheckCastAlign(Expr *Op, QualType T, SourceRange TRange) {
    // This is actually a lot of work to potentially be doing on every
    // cast; don't do it if we're ignoring -Wcast_align (as is the default).
    if (getDiagnostics().isIgnored(diag::warn_cast_align, TRange.getBegin()))
      return;
  
    // Ignore dependent types.
    if (T->isDependentType() || Op->getType()->isDependentType())
      return;
  
    // Require that the destination be a pointer type.
    const PointerType *DestPtr = T->getAs<PointerType>();
    if (!DestPtr) return;
  
    // If the destination has alignment 1, we're done.
    QualType DestPointee = DestPtr->getPointeeType();
    if (DestPointee->isIncompleteType()) return;
    CharUnits DestAlign = Context.getTypeAlignInChars(DestPointee);
    if (DestAlign.isOne()) return;
  
    // Require that the source be a pointer type.
    const PointerType *SrcPtr = Op->getType()->getAs<PointerType>();
    if (!SrcPtr) return;
    QualType SrcPointee = SrcPtr->getPointeeType();
  
    // Whitelist casts from cv void*.  We already implicitly
    // whitelisted casts to cv void*, since they have alignment 1.
    // Also whitelist casts involving incomplete types, which implicitly
    // includes 'void'.
    if (SrcPointee->isIncompleteType()) return;
  
    CharUnits SrcAlign = getPresumedAlignmentOfPointer(Op, *this);
  
    if (SrcAlign >= DestAlign) return;
  
    Diag(TRange.getBegin(), diag::warn_cast_align)
      << Op->getType() << T
      << static_cast<unsigned>(SrcAlign.getQuantity())
      << static_cast<unsigned>(DestAlign.getQuantity())
      << TRange << Op->getSourceRange();
  }
  
  /// Check whether this array fits the idiom of a size-one tail padded
  /// array member of a struct.
  ///
  /// We avoid emitting out-of-bounds access warnings for such arrays as they are
  /// commonly used to emulate flexible arrays in C89 code.
  static bool IsTailPaddedMemberArray(Sema &S, const llvm::APInt &Size,
                                      const NamedDecl *ND) {
    if (Size != 1 || !ND) return false;
  
    const FieldDecl *FD = dyn_cast<FieldDecl>(ND);
    if (!FD) return false;
  
    // Don't consider sizes resulting from macro expansions or template argument
    // substitution to form C89 tail-padded arrays.
  
    TypeSourceInfo *TInfo = FD->getTypeSourceInfo();
    while (TInfo) {
      TypeLoc TL = TInfo->getTypeLoc();
      // Look through typedefs.
      if (TypedefTypeLoc TTL = TL.getAs<TypedefTypeLoc>()) {
        const TypedefNameDecl *TDL = TTL.getTypedefNameDecl();
        TInfo = TDL->getTypeSourceInfo();
        continue;
      }
      if (ConstantArrayTypeLoc CTL = TL.getAs<ConstantArrayTypeLoc>()) {
        const Expr *SizeExpr = dyn_cast<IntegerLiteral>(CTL.getSizeExpr());
        if (!SizeExpr || SizeExpr->getExprLoc().isMacroID())
          return false;
      }
      break;
    }
  
    const RecordDecl *RD = dyn_cast<RecordDecl>(FD->getDeclContext());
    if (!RD) return false;
    if (RD->isUnion()) return false;
    if (const CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
      if (!CRD->isStandardLayout()) return false;
    }
  
    // See if this is the last field decl in the record.
    const Decl *D = FD;
    while ((D = D->getNextDeclInContext()))
      if (isa<FieldDecl>(D))
        return false;
    return true;
  }
  
  void Sema::CheckArrayAccess(const Expr *BaseExpr, const Expr *IndexExpr,
                              const ArraySubscriptExpr *ASE,
                              bool AllowOnePastEnd, bool IndexNegated) {
    // Already diagnosed by the constant evaluator.
    if (isConstantEvaluated())
      return;
  
    IndexExpr = IndexExpr->IgnoreParenImpCasts();
    if (IndexExpr->isValueDependent())
      return;
  
    const Type *EffectiveType =
        BaseExpr->getType()->getPointeeOrArrayElementType();
    BaseExpr = BaseExpr->IgnoreParenCasts();
    const ConstantArrayType *ArrayTy =
        Context.getAsConstantArrayType(BaseExpr->getType());
  
    if (!ArrayTy)
      return;
  
    const Type *BaseType = ArrayTy->getElementType().getTypePtr();
    if (EffectiveType->isDependentType() || BaseType->isDependentType())
      return;
  
    Expr::EvalResult Result;
    if (!IndexExpr->EvaluateAsInt(Result, Context, Expr::SE_AllowSideEffects))
      return;
  
    llvm::APSInt index = Result.Val.getInt();
    if (IndexNegated)
      index = -index;
  
    const NamedDecl *ND = nullptr;
    if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BaseExpr))
      ND = DRE->getDecl();
    if (const MemberExpr *ME = dyn_cast<MemberExpr>(BaseExpr))
      ND = ME->getMemberDecl();
  
    if (index.isUnsigned() || !index.isNegative()) {
      // It is possible that the type of the base expression after
      // IgnoreParenCasts is incomplete, even though the type of the base
      // expression before IgnoreParenCasts is complete (see PR39746 for an
      // example). In this case we have no information about whether the array
      // access exceeds the array bounds. However we can still diagnose an array
      // access which precedes the array bounds.
      if (BaseType->isIncompleteType())
        return;
  
      llvm::APInt size = ArrayTy->getSize();
      if (!size.isStrictlyPositive())
        return;
  
      if (BaseType != EffectiveType) {
        // Make sure we're comparing apples to apples when comparing index to size
        uint64_t ptrarith_typesize = Context.getTypeSize(EffectiveType);
        uint64_t array_typesize = Context.getTypeSize(BaseType);
        // Handle ptrarith_typesize being zero, such as when casting to void*
        if (!ptrarith_typesize) ptrarith_typesize = 1;
        if (ptrarith_typesize != array_typesize) {
          // There's a cast to a different size type involved
          uint64_t ratio = array_typesize / ptrarith_typesize;
          // TODO: Be smarter about handling cases where array_typesize is not a
          // multiple of ptrarith_typesize
          if (ptrarith_typesize * ratio == array_typesize)
            size *= llvm::APInt(size.getBitWidth(), ratio);
        }
      }
  
      if (size.getBitWidth() > index.getBitWidth())
        index = index.zext(size.getBitWidth());
      else if (size.getBitWidth() < index.getBitWidth())
        size = size.zext(index.getBitWidth());
  
      // For array subscripting the index must be less than size, but for pointer
      // arithmetic also allow the index (offset) to be equal to size since
      // computing the next address after the end of the array is legal and
      // commonly done e.g. in C++ iterators and range-based for loops.
      if (AllowOnePastEnd ? index.ule(size) : index.ult(size))
        return;
  
      // Also don't warn for arrays of size 1 which are members of some
      // structure. These are often used to approximate flexible arrays in C89
      // code.
      if (IsTailPaddedMemberArray(*this, size, ND))
        return;
  
      // Suppress the warning if the subscript expression (as identified by the
      // ']' location) and the index expression are both from macro expansions
      // within a system header.
      if (ASE) {
        SourceLocation RBracketLoc = SourceMgr.getSpellingLoc(
            ASE->getRBracketLoc());
        if (SourceMgr.isInSystemHeader(RBracketLoc)) {
          SourceLocation IndexLoc =
              SourceMgr.getSpellingLoc(IndexExpr->getBeginLoc());
          if (SourceMgr.isWrittenInSameFile(RBracketLoc, IndexLoc))
            return;
        }
      }
  
      unsigned DiagID = diag::warn_ptr_arith_exceeds_bounds;
      if (ASE)
        DiagID = diag::warn_array_index_exceeds_bounds;
  
      DiagRuntimeBehavior(BaseExpr->getBeginLoc(), BaseExpr,
                          PDiag(DiagID) << index.toString(10, true)
                                        << size.toString(10, true)
                                        << (unsigned)size.getLimitedValue(~0U)
                                        << IndexExpr->getSourceRange());
    } else {
      unsigned DiagID = diag::warn_array_index_precedes_bounds;
      if (!ASE) {
        DiagID = diag::warn_ptr_arith_precedes_bounds;
        if (index.isNegative()) index = -index;
      }
  
      DiagRuntimeBehavior(BaseExpr->getBeginLoc(), BaseExpr,
                          PDiag(DiagID) << index.toString(10, true)
                                        << IndexExpr->getSourceRange());
    }
  
    if (!ND) {
      // Try harder to find a NamedDecl to point at in the note.
      while (const ArraySubscriptExpr *ASE =
             dyn_cast<ArraySubscriptExpr>(BaseExpr))
        BaseExpr = ASE->getBase()->IgnoreParenCasts();
      if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BaseExpr))
        ND = DRE->getDecl();
      if (const MemberExpr *ME = dyn_cast<MemberExpr>(BaseExpr))
        ND = ME->getMemberDecl();
    }
  
    if (ND)
      DiagRuntimeBehavior(ND->getBeginLoc(), BaseExpr,
                          PDiag(diag::note_array_declared_here)
                              << ND->getDeclName());
  }
  
  void Sema::CheckArrayAccess(const Expr *expr) {
    int AllowOnePastEnd = 0;
    while (expr) {
      expr = expr->IgnoreParenImpCasts();
      switch (expr->getStmtClass()) {
        case Stmt::ArraySubscriptExprClass: {
          const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(expr);
          CheckArrayAccess(ASE->getBase(), ASE->getIdx(), ASE,
                           AllowOnePastEnd > 0);
          expr = ASE->getBase();
          break;
        }
        case Stmt::MemberExprClass: {
          expr = cast<MemberExpr>(expr)->getBase();
          break;
        }
        case Stmt::OMPArraySectionExprClass: {
          const OMPArraySectionExpr *ASE = cast<OMPArraySectionExpr>(expr);
          if (ASE->getLowerBound())
            CheckArrayAccess(ASE->getBase(), ASE->getLowerBound(),
                             /*ASE=*/nullptr, AllowOnePastEnd > 0);
          return;
        }
        case Stmt::UnaryOperatorClass: {
          // Only unwrap the * and & unary operators
          const UnaryOperator *UO = cast<UnaryOperator>(expr);
          expr = UO->getSubExpr();
          switch (UO->getOpcode()) {
            case UO_AddrOf:
              AllowOnePastEnd++;
              break;
            case UO_Deref:
              AllowOnePastEnd--;
              break;
            default:
              return;
          }
          break;
        }
        case Stmt::ConditionalOperatorClass: {
          const ConditionalOperator *cond = cast<ConditionalOperator>(expr);
          if (const Expr *lhs = cond->getLHS())
            CheckArrayAccess(lhs);
          if (const Expr *rhs = cond->getRHS())
            CheckArrayAccess(rhs);
          return;
        }
        case Stmt::CXXOperatorCallExprClass: {
          const auto *OCE = cast<CXXOperatorCallExpr>(expr);
          for (const auto *Arg : OCE->arguments())
            CheckArrayAccess(Arg);
          return;
        }
        default:
          return;
      }
    }
  }
  
  //===--- CHECK: Objective-C retain cycles ----------------------------------//
  
  namespace {
  
  struct RetainCycleOwner {
    VarDecl *Variable = nullptr;
    SourceRange Range;
    SourceLocation Loc;
    bool Indirect = false;
  
    RetainCycleOwner() = default;
  
    void setLocsFrom(Expr *e) {
      Loc = e->getExprLoc();
      Range = e->getSourceRange();
    }
  };
  
  } // namespace
  
  /// Consider whether capturing the given variable can possibly lead to
  /// a retain cycle.
  static bool considerVariable(VarDecl *var, Expr *ref, RetainCycleOwner &owner) {
    // In ARC, it's captured strongly iff the variable has __strong
    // lifetime.  In MRR, it's captured strongly if the variable is
    // __block and has an appropriate type.
    if (var->getType().getObjCLifetime() != Qualifiers::OCL_Strong)
      return false;
  
    owner.Variable = var;
    if (ref)
      owner.setLocsFrom(ref);
    return true;
  }
  
  static bool findRetainCycleOwner(Sema &S, Expr *e, RetainCycleOwner &owner) {
    while (true) {
      e = e->IgnoreParens();
      if (CastExpr *cast = dyn_cast<CastExpr>(e)) {
        switch (cast->getCastKind()) {
        case CK_BitCast:
        case CK_LValueBitCast:
        case CK_LValueToRValue:
        case CK_ARCReclaimReturnedObject:
          e = cast->getSubExpr();
          continue;
  
        default:
          return false;
        }
      }
  
      if (ObjCIvarRefExpr *ref = dyn_cast<ObjCIvarRefExpr>(e)) {
        ObjCIvarDecl *ivar = ref->getDecl();
        if (ivar->getType().getObjCLifetime() != Qualifiers::OCL_Strong)
          return false;
  
        // Try to find a retain cycle in the base.
        if (!findRetainCycleOwner(S, ref->getBase(), owner))
          return false;
  
        if (ref->isFreeIvar()) owner.setLocsFrom(ref);
        owner.Indirect = true;
        return true;
      }
  
      if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(e)) {
        VarDecl *var = dyn_cast<VarDecl>(ref->getDecl());
        if (!var) return false;
        return considerVariable(var, ref, owner);
      }
  
      if (MemberExpr *member = dyn_cast<MemberExpr>(e)) {
        if (member->isArrow()) return false;
  
        // Don't count this as an indirect ownership.
        e = member->getBase();
        continue;
      }
  
      if (PseudoObjectExpr *pseudo = dyn_cast<PseudoObjectExpr>(e)) {
        // Only pay attention to pseudo-objects on property references.
        ObjCPropertyRefExpr *pre
          = dyn_cast<ObjCPropertyRefExpr>(pseudo->getSyntacticForm()
                                                ->IgnoreParens());
        if (!pre) return false;
        if (pre->isImplicitProperty()) return false;
        ObjCPropertyDecl *property = pre->getExplicitProperty();
        if (!property->isRetaining() &&
            !(property->getPropertyIvarDecl() &&
              property->getPropertyIvarDecl()->getType()
                .getObjCLifetime() == Qualifiers::OCL_Strong))
            return false;
  
        owner.Indirect = true;
        if (pre->isSuperReceiver()) {
          owner.Variable = S.getCurMethodDecl()->getSelfDecl();
          if (!owner.Variable)
            return false;
          owner.Loc = pre->getLocation();
          owner.Range = pre->getSourceRange();
          return true;
        }
        e = const_cast<Expr*>(cast<OpaqueValueExpr>(pre->getBase())
                                ->getSourceExpr());
        continue;
      }
  
      // Array ivars?
  
      return false;
    }
  }
  
  namespace {
  
    struct FindCaptureVisitor : EvaluatedExprVisitor<FindCaptureVisitor> {
      ASTContext &Context;
      VarDecl *Variable;
      Expr *Capturer = nullptr;
      bool VarWillBeReased = false;
  
      FindCaptureVisitor(ASTContext &Context, VarDecl *variable)
          : EvaluatedExprVisitor<FindCaptureVisitor>(Context),
            Context(Context), Variable(variable) {}
  
      void VisitDeclRefExpr(DeclRefExpr *ref) {
        if (ref->getDecl() == Variable && !Capturer)
          Capturer = ref;
      }
  
      void VisitObjCIvarRefExpr(ObjCIvarRefExpr *ref) {
        if (Capturer) return;
        Visit(ref->getBase());
        if (Capturer && ref->isFreeIvar())
          Capturer = ref;
      }
  
      void VisitBlockExpr(BlockExpr *block) {
        // Look inside nested blocks
        if (block->getBlockDecl()->capturesVariable(Variable))
          Visit(block->getBlockDecl()->getBody());
      }
  
      void VisitOpaqueValueExpr(OpaqueValueExpr *OVE) {
        if (Capturer) return;
        if (OVE->getSourceExpr())
          Visit(OVE->getSourceExpr());
      }
  
      void VisitBinaryOperator(BinaryOperator *BinOp) {
        if (!Variable || VarWillBeReased || BinOp->getOpcode() != BO_Assign)
          return;
        Expr *LHS = BinOp->getLHS();
        if (const DeclRefExpr *DRE = dyn_cast_or_null<DeclRefExpr>(LHS)) {
          if (DRE->getDecl() != Variable)
            return;
          if (Expr *RHS = BinOp->getRHS()) {
            RHS = RHS->IgnoreParenCasts();
            llvm::APSInt Value;
            VarWillBeReased =
              (RHS && RHS->isIntegerConstantExpr(Value, Context) && Value == 0);
          }
        }
      }
    };
  
  } // namespace
  
  /// Check whether the given argument is a block which captures a
  /// variable.
  static Expr *findCapturingExpr(Sema &S, Expr *e, RetainCycleOwner &owner) {
    assert(owner.Variable && owner.Loc.isValid());
  
    e = e->IgnoreParenCasts();
  
    // Look through [^{...} copy] and Block_copy(^{...}).
    if (ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(e)) {
      Selector Cmd = ME->getSelector();
      if (Cmd.isUnarySelector() && Cmd.getNameForSlot(0) == "copy") {
        e = ME->getInstanceReceiver();
        if (!e)
          return nullptr;
        e = e->IgnoreParenCasts();
      }
    } else if (CallExpr *CE = dyn_cast<CallExpr>(e)) {
      if (CE->getNumArgs() == 1) {
        FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(CE->getCalleeDecl());
        if (Fn) {
          const IdentifierInfo *FnI = Fn->getIdentifier();
          if (FnI && FnI->isStr("_Block_copy")) {
            e = CE->getArg(0)->IgnoreParenCasts();
          }
        }
      }
    }
  
    BlockExpr *block = dyn_cast<BlockExpr>(e);
    if (!block || !block->getBlockDecl()->capturesVariable(owner.Variable))
      return nullptr;
  
    FindCaptureVisitor visitor(S.Context, owner.Variable);
    visitor.Visit(block->getBlockDecl()->getBody());
    return visitor.VarWillBeReased ? nullptr : visitor.Capturer;
  }
  
  static void diagnoseRetainCycle(Sema &S, Expr *capturer,
                                  RetainCycleOwner &owner) {
    assert(capturer);
    assert(owner.Variable && owner.Loc.isValid());
  
    S.Diag(capturer->getExprLoc(), diag::warn_arc_retain_cycle)
      << owner.Variable << capturer->getSourceRange();
    S.Diag(owner.Loc, diag::note_arc_retain_cycle_owner)
      << owner.Indirect << owner.Range;
  }
  
  /// Check for a keyword selector that starts with the word 'add' or
  /// 'set'.
  static bool isSetterLikeSelector(Selector sel) {
    if (sel.isUnarySelector()) return false;
  
    StringRef str = sel.getNameForSlot(0);
    while (!str.empty() && str.front() == '_') str = str.substr(1);
    if (str.startswith("set"))
      str = str.substr(3);
    else if (str.startswith("add")) {
      // Specially whitelist 'addOperationWithBlock:'.
      if (sel.getNumArgs() == 1 && str.startswith("addOperationWithBlock"))
        return false;
      str = str.substr(3);
    }
    else
      return false;
  
    if (str.empty()) return true;
    return !isLowercase(str.front());
  }
  
  static Optional<int> GetNSMutableArrayArgumentIndex(Sema &S,
                                                      ObjCMessageExpr *Message) {
    bool IsMutableArray = S.NSAPIObj->isSubclassOfNSClass(
                                                  Message->getReceiverInterface(),
                                                  NSAPI::ClassId_NSMutableArray);
    if (!IsMutableArray) {
      return None;
    }
  
    Selector Sel = Message->getSelector();
  
    Optional<NSAPI::NSArrayMethodKind> MKOpt =
      S.NSAPIObj->getNSArrayMethodKind(Sel);
    if (!MKOpt) {
      return None;
    }
  
    NSAPI::NSArrayMethodKind MK = *MKOpt;
  
    switch (MK) {
      case NSAPI::NSMutableArr_addObject:
      case NSAPI::NSMutableArr_insertObjectAtIndex:
      case NSAPI::NSMutableArr_setObjectAtIndexedSubscript:
        return 0;
      case NSAPI::NSMutableArr_replaceObjectAtIndex:
        return 1;
  
      default:
        return None;
    }
  
    return None;
  }
  
  static
  Optional<int> GetNSMutableDictionaryArgumentIndex(Sema &S,
                                                    ObjCMessageExpr *Message) {
    bool IsMutableDictionary = S.NSAPIObj->isSubclassOfNSClass(
                                              Message->getReceiverInterface(),
                                              NSAPI::ClassId_NSMutableDictionary);
    if (!IsMutableDictionary) {
      return None;
    }
  
    Selector Sel = Message->getSelector();
  
    Optional<NSAPI::NSDictionaryMethodKind> MKOpt =
      S.NSAPIObj->getNSDictionaryMethodKind(Sel);
    if (!MKOpt) {
      return None;
    }
  
    NSAPI::NSDictionaryMethodKind MK = *MKOpt;
  
    switch (MK) {
      case NSAPI::NSMutableDict_setObjectForKey:
      case NSAPI::NSMutableDict_setValueForKey:
      case NSAPI::NSMutableDict_setObjectForKeyedSubscript:
        return 0;
  
      default:
        return None;
    }
  
    return None;
  }
  
  static Optional<int> GetNSSetArgumentIndex(Sema &S, ObjCMessageExpr *Message) {
    bool IsMutableSet = S.NSAPIObj->isSubclassOfNSClass(
                                                  Message->getReceiverInterface(),
                                                  NSAPI::ClassId_NSMutableSet);
  
    bool IsMutableOrderedSet = S.NSAPIObj->isSubclassOfNSClass(
                                              Message->getReceiverInterface(),
                                              NSAPI::ClassId_NSMutableOrderedSet);
    if (!IsMutableSet && !IsMutableOrderedSet) {
      return None;
    }
  
    Selector Sel = Message->getSelector();
  
    Optional<NSAPI::NSSetMethodKind> MKOpt = S.NSAPIObj->getNSSetMethodKind(Sel);
    if (!MKOpt) {
      return None;
    }
  
    NSAPI::NSSetMethodKind MK = *MKOpt;
  
    switch (MK) {
      case NSAPI::NSMutableSet_addObject:
      case NSAPI::NSOrderedSet_setObjectAtIndex:
      case NSAPI::NSOrderedSet_setObjectAtIndexedSubscript:
      case NSAPI::NSOrderedSet_insertObjectAtIndex:
        return 0;
      case NSAPI::NSOrderedSet_replaceObjectAtIndexWithObject:
        return 1;
    }
  
    return None;
  }
  
  void Sema::CheckObjCCircularContainer(ObjCMessageExpr *Message) {
    if (!Message->isInstanceMessage()) {
      return;
    }
  
    Optional<int> ArgOpt;
  
    if (!(ArgOpt = GetNSMutableArrayArgumentIndex(*this, Message)) &&
        !(ArgOpt = GetNSMutableDictionaryArgumentIndex(*this, Message)) &&
        !(ArgOpt = GetNSSetArgumentIndex(*this, Message))) {
      return;
    }
  
    int ArgIndex = *ArgOpt;
  
    Expr *Arg = Message->getArg(ArgIndex)->IgnoreImpCasts();
    if (OpaqueValueExpr *OE = dyn_cast<OpaqueValueExpr>(Arg)) {
      Arg = OE->getSourceExpr()->IgnoreImpCasts();
    }
  
    if (Message->getReceiverKind() == ObjCMessageExpr::SuperInstance) {
      if (DeclRefExpr *ArgRE = dyn_cast<DeclRefExpr>(Arg)) {
        if (ArgRE->isObjCSelfExpr()) {
          Diag(Message->getSourceRange().getBegin(),
               diag::warn_objc_circular_container)
            << ArgRE->getDecl() << StringRef("'super'");
        }
      }
    } else {
      Expr *Receiver = Message->getInstanceReceiver()->IgnoreImpCasts();
  
      if (OpaqueValueExpr *OE = dyn_cast<OpaqueValueExpr>(Receiver)) {
        Receiver = OE->getSourceExpr()->IgnoreImpCasts();
      }
  
      if (DeclRefExpr *ReceiverRE = dyn_cast<DeclRefExpr>(Receiver)) {
        if (DeclRefExpr *ArgRE = dyn_cast<DeclRefExpr>(Arg)) {
          if (ReceiverRE->getDecl() == ArgRE->getDecl()) {
            ValueDecl *Decl = ReceiverRE->getDecl();
            Diag(Message->getSourceRange().getBegin(),
                 diag::warn_objc_circular_container)
              << Decl << Decl;
            if (!ArgRE->isObjCSelfExpr()) {
              Diag(Decl->getLocation(),
                   diag::note_objc_circular_container_declared_here)
                << Decl;
            }
          }
        }
      } else if (ObjCIvarRefExpr *IvarRE = dyn_cast<ObjCIvarRefExpr>(Receiver)) {
        if (ObjCIvarRefExpr *IvarArgRE = dyn_cast<ObjCIvarRefExpr>(Arg)) {
          if (IvarRE->getDecl() == IvarArgRE->getDecl()) {
            ObjCIvarDecl *Decl = IvarRE->getDecl();
            Diag(Message->getSourceRange().getBegin(),
                 diag::warn_objc_circular_container)
              << Decl << Decl;
            Diag(Decl->getLocation(),
                 diag::note_objc_circular_container_declared_here)
              << Decl;
          }
        }
      }
    }
  }
  
  /// Check a message send to see if it's likely to cause a retain cycle.
  void Sema::checkRetainCycles(ObjCMessageExpr *msg) {
    // Only check instance methods whose selector looks like a setter.
    if (!msg->isInstanceMessage() || !isSetterLikeSelector(msg->getSelector()))
      return;
  
    // Try to find a variable that the receiver is strongly owned by.
    RetainCycleOwner owner;
    if (msg->getReceiverKind() == ObjCMessageExpr::Instance) {
      if (!findRetainCycleOwner(*this, msg->getInstanceReceiver(), owner))
        return;
    } else {
      assert(msg->getReceiverKind() == ObjCMessageExpr::SuperInstance);
      owner.Variable = getCurMethodDecl()->getSelfDecl();
      owner.Loc = msg->getSuperLoc();
      owner.Range = msg->getSuperLoc();
    }
  
    // Check whether the receiver is captured by any of the arguments.
    const ObjCMethodDecl *MD = msg->getMethodDecl();
    for (unsigned i = 0, e = msg->getNumArgs(); i != e; ++i) {
      if (Expr *capturer = findCapturingExpr(*this, msg->getArg(i), owner)) {
        // noescape blocks should not be retained by the method.
        if (MD && MD->parameters()[i]->hasAttr<NoEscapeAttr>())
          continue;
        return diagnoseRetainCycle(*this, capturer, owner);
      }
    }
  }
  
  /// Check a property assign to see if it's likely to cause a retain cycle.
  void Sema::checkRetainCycles(Expr *receiver, Expr *argument) {
    RetainCycleOwner owner;
    if (!findRetainCycleOwner(*this, receiver, owner))
      return;
  
    if (Expr *capturer = findCapturingExpr(*this, argument, owner))
      diagnoseRetainCycle(*this, capturer, owner);
  }
  
  void Sema::checkRetainCycles(VarDecl *Var, Expr *Init) {
    RetainCycleOwner Owner;
    if (!considerVariable(Var, /*DeclRefExpr=*/nullptr, Owner))
      return;
  
    // Because we don't have an expression for the variable, we have to set the
    // location explicitly here.
    Owner.Loc = Var->getLocation();
    Owner.Range = Var->getSourceRange();
  
    if (Expr *Capturer = findCapturingExpr(*this, Init, Owner))
      diagnoseRetainCycle(*this, Capturer, Owner);
  }
  
  static bool checkUnsafeAssignLiteral(Sema &S, SourceLocation Loc,
                                       Expr *RHS, bool isProperty) {
    // Check if RHS is an Objective-C object literal, which also can get
    // immediately zapped in a weak reference.  Note that we explicitly
    // allow ObjCStringLiterals, since those are designed to never really die.
    RHS = RHS->IgnoreParenImpCasts();
  
    // This enum needs to match with the 'select' in
    // warn_objc_arc_literal_assign (off-by-1).
    Sema::ObjCLiteralKind Kind = S.CheckLiteralKind(RHS);
    if (Kind == Sema::LK_String || Kind == Sema::LK_None)
      return false;
  
    S.Diag(Loc, diag::warn_arc_literal_assign)
      << (unsigned) Kind
      << (isProperty ? 0 : 1)
      << RHS->getSourceRange();
  
    return true;
  }
  
  static bool checkUnsafeAssignObject(Sema &S, SourceLocation Loc,
                                      Qualifiers::ObjCLifetime LT,
                                      Expr *RHS, bool isProperty) {
    // Strip off any implicit cast added to get to the one ARC-specific.
    while (ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(RHS)) {
      if (cast->getCastKind() == CK_ARCConsumeObject) {
        S.Diag(Loc, diag::warn_arc_retained_assign)
          << (LT == Qualifiers::OCL_ExplicitNone)
          << (isProperty ? 0 : 1)
          << RHS->getSourceRange();
        return true;
      }
      RHS = cast->getSubExpr();
    }
  
    if (LT == Qualifiers::OCL_Weak &&
        checkUnsafeAssignLiteral(S, Loc, RHS, isProperty))
      return true;
  
    return false;
  }
  
  bool Sema::checkUnsafeAssigns(SourceLocation Loc,
                                QualType LHS, Expr *RHS) {
    Qualifiers::ObjCLifetime LT = LHS.getObjCLifetime();
  
    if (LT != Qualifiers::OCL_Weak && LT != Qualifiers::OCL_ExplicitNone)
      return false;
  
    if (checkUnsafeAssignObject(*this, Loc, LT, RHS, false))
      return true;
  
    return false;
  }
  
  void Sema::checkUnsafeExprAssigns(SourceLocation Loc,
                                Expr *LHS, Expr *RHS) {
    QualType LHSType;
    // PropertyRef on LHS type need be directly obtained from
    // its declaration as it has a PseudoType.
    ObjCPropertyRefExpr *PRE
      = dyn_cast<ObjCPropertyRefExpr>(LHS->IgnoreParens());
    if (PRE && !PRE->isImplicitProperty()) {
      const ObjCPropertyDecl *PD = PRE->getExplicitProperty();
      if (PD)
        LHSType = PD->getType();
    }
  
    if (LHSType.isNull())
      LHSType = LHS->getType();
  
    Qualifiers::ObjCLifetime LT = LHSType.getObjCLifetime();
  
    if (LT == Qualifiers::OCL_Weak) {
      if (!Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, Loc))
        getCurFunction()->markSafeWeakUse(LHS);
    }
  
    if (checkUnsafeAssigns(Loc, LHSType, RHS))
      return;
  
    // FIXME. Check for other life times.
    if (LT != Qualifiers::OCL_None)
      return;
  
    if (PRE) {
      if (PRE->isImplicitProperty())
        return;
      const ObjCPropertyDecl *PD = PRE->getExplicitProperty();
      if (!PD)
        return;
  
      unsigned Attributes = PD->getPropertyAttributes();
      if (Attributes & ObjCPropertyDecl::OBJC_PR_assign) {
        // when 'assign' attribute was not explicitly specified
        // by user, ignore it and rely on property type itself
        // for lifetime info.
        unsigned AsWrittenAttr = PD->getPropertyAttributesAsWritten();
        if (!(AsWrittenAttr & ObjCPropertyDecl::OBJC_PR_assign) &&
            LHSType->isObjCRetainableType())
          return;
  
        while (ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(RHS)) {
          if (cast->getCastKind() == CK_ARCConsumeObject) {
            Diag(Loc, diag::warn_arc_retained_property_assign)
            << RHS->getSourceRange();
            return;
          }
          RHS = cast->getSubExpr();
        }
      }
      else if (Attributes & ObjCPropertyDecl::OBJC_PR_weak) {
        if (checkUnsafeAssignObject(*this, Loc, Qualifiers::OCL_Weak, RHS, true))
          return;
      }
    }
  }
  
  //===--- CHECK: Empty statement body (-Wempty-body) ---------------------===//
  
  static bool ShouldDiagnoseEmptyStmtBody(const SourceManager &SourceMgr,
                                          SourceLocation StmtLoc,
                                          const NullStmt *Body) {
    // Do not warn if the body is a macro that expands to nothing, e.g:
    //
    // #define CALL(x)
    // if (condition)
    //   CALL(0);
    if (Body->hasLeadingEmptyMacro())
      return false;
  
    // Get line numbers of statement and body.
    bool StmtLineInvalid;
    unsigned StmtLine = SourceMgr.getPresumedLineNumber(StmtLoc,
                                                        &StmtLineInvalid);
    if (StmtLineInvalid)
      return false;
  
    bool BodyLineInvalid;
    unsigned BodyLine = SourceMgr.getSpellingLineNumber(Body->getSemiLoc(),
                                                        &BodyLineInvalid);
    if (BodyLineInvalid)
      return false;
  
    // Warn if null statement and body are on the same line.
    if (StmtLine != BodyLine)
      return false;
  
    return true;
  }
  
  void Sema::DiagnoseEmptyStmtBody(SourceLocation StmtLoc,
                                   const Stmt *Body,
                                   unsigned DiagID) {
    // Since this is a syntactic check, don't emit diagnostic for template
    // instantiations, this just adds noise.
    if (CurrentInstantiationScope)
      return;
  
    // The body should be a null statement.
    const NullStmt *NBody = dyn_cast<NullStmt>(Body);
    if (!NBody)
      return;
  
    // Do the usual checks.
    if (!ShouldDiagnoseEmptyStmtBody(SourceMgr, StmtLoc, NBody))
      return;
  
    Diag(NBody->getSemiLoc(), DiagID);
    Diag(NBody->getSemiLoc(), diag::note_empty_body_on_separate_line);
  }
  
  void Sema::DiagnoseEmptyLoopBody(const Stmt *S,
                                   const Stmt *PossibleBody) {
    assert(!CurrentInstantiationScope); // Ensured by caller
  
    SourceLocation StmtLoc;
    const Stmt *Body;
    unsigned DiagID;
    if (const ForStmt *FS = dyn_cast<ForStmt>(S)) {
      StmtLoc = FS->getRParenLoc();
      Body = FS->getBody();
      DiagID = diag::warn_empty_for_body;
    } else if (const WhileStmt *WS = dyn_cast<WhileStmt>(S)) {
      StmtLoc = WS->getCond()->getSourceRange().getEnd();
      Body = WS->getBody();
      DiagID = diag::warn_empty_while_body;
    } else
      return; // Neither `for' nor `while'.
  
    // The body should be a null statement.
    const NullStmt *NBody = dyn_cast<NullStmt>(Body);
    if (!NBody)
      return;
  
    // Skip expensive checks if diagnostic is disabled.
    if (Diags.isIgnored(DiagID, NBody->getSemiLoc()))
      return;
  
    // Do the usual checks.
    if (!ShouldDiagnoseEmptyStmtBody(SourceMgr, StmtLoc, NBody))
      return;
  
    // `for(...);' and `while(...);' are popular idioms, so in order to keep
    // noise level low, emit diagnostics only if for/while is followed by a
    // CompoundStmt, e.g.:
    //    for (int i = 0; i < n; i++);
    //    {
    //      a(i);
    //    }
    // or if for/while is followed by a statement with more indentation
    // than for/while itself:
    //    for (int i = 0; i < n; i++);
    //      a(i);
    bool ProbableTypo = isa<CompoundStmt>(PossibleBody);
    if (!ProbableTypo) {
      bool BodyColInvalid;
      unsigned BodyCol = SourceMgr.getPresumedColumnNumber(
          PossibleBody->getBeginLoc(), &BodyColInvalid);
      if (BodyColInvalid)
        return;
  
      bool StmtColInvalid;
      unsigned StmtCol =
          SourceMgr.getPresumedColumnNumber(S->getBeginLoc(), &StmtColInvalid);
      if (StmtColInvalid)
        return;
  
      if (BodyCol > StmtCol)
        ProbableTypo = true;
    }
  
    if (ProbableTypo) {
      Diag(NBody->getSemiLoc(), DiagID);
      Diag(NBody->getSemiLoc(), diag::note_empty_body_on_separate_line);
    }
  }
  
  //===--- CHECK: Warn on self move with std::move. -------------------------===//
  
  /// DiagnoseSelfMove - Emits a warning if a value is moved to itself.
  void Sema::DiagnoseSelfMove(const Expr *LHSExpr, const Expr *RHSExpr,
                               SourceLocation OpLoc) {
    if (Diags.isIgnored(diag::warn_sizeof_pointer_expr_memaccess, OpLoc))
      return;
  
    if (inTemplateInstantiation())
      return;
  
    // Strip parens and casts away.
    LHSExpr = LHSExpr->IgnoreParenImpCasts();
    RHSExpr = RHSExpr->IgnoreParenImpCasts();
  
    // Check for a call expression
    const CallExpr *CE = dyn_cast<CallExpr>(RHSExpr);
    if (!CE || CE->getNumArgs() != 1)
      return;
  
    // Check for a call to std::move
    if (!CE->isCallToStdMove())
      return;
  
    // Get argument from std::move
    RHSExpr = CE->getArg(0);
  
    const DeclRefExpr *LHSDeclRef = dyn_cast<DeclRefExpr>(LHSExpr);
    const DeclRefExpr *RHSDeclRef = dyn_cast<DeclRefExpr>(RHSExpr);
  
    // Two DeclRefExpr's, check that the decls are the same.
    if (LHSDeclRef && RHSDeclRef) {
      if (!LHSDeclRef->getDecl() || !RHSDeclRef->getDecl())
        return;
      if (LHSDeclRef->getDecl()->getCanonicalDecl() !=
          RHSDeclRef->getDecl()->getCanonicalDecl())
        return;
  
      Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
                                          << LHSExpr->getSourceRange()
                                          << RHSExpr->getSourceRange();
      return;
    }
  
    // Member variables require a different approach to check for self moves.
    // MemberExpr's are the same if every nested MemberExpr refers to the same
    // Decl and that the base Expr's are DeclRefExpr's with the same Decl or
    // the base Expr's are CXXThisExpr's.
    const Expr *LHSBase = LHSExpr;
    const Expr *RHSBase = RHSExpr;
    const MemberExpr *LHSME = dyn_cast<MemberExpr>(LHSExpr);
    const MemberExpr *RHSME = dyn_cast<MemberExpr>(RHSExpr);
    if (!LHSME || !RHSME)
      return;
  
    while (LHSME && RHSME) {
      if (LHSME->getMemberDecl()->getCanonicalDecl() !=
          RHSME->getMemberDecl()->getCanonicalDecl())
        return;
  
      LHSBase = LHSME->getBase();
      RHSBase = RHSME->getBase();
      LHSME = dyn_cast<MemberExpr>(LHSBase);
      RHSME = dyn_cast<MemberExpr>(RHSBase);
    }
  
    LHSDeclRef = dyn_cast<DeclRefExpr>(LHSBase);
    RHSDeclRef = dyn_cast<DeclRefExpr>(RHSBase);
    if (LHSDeclRef && RHSDeclRef) {
      if (!LHSDeclRef->getDecl() || !RHSDeclRef->getDecl())
        return;
      if (LHSDeclRef->getDecl()->getCanonicalDecl() !=
          RHSDeclRef->getDecl()->getCanonicalDecl())
        return;
  
      Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
                                          << LHSExpr->getSourceRange()
                                          << RHSExpr->getSourceRange();
      return;
    }
  
    if (isa<CXXThisExpr>(LHSBase) && isa<CXXThisExpr>(RHSBase))
      Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
                                          << LHSExpr->getSourceRange()
                                          << RHSExpr->getSourceRange();
  }
  
  //===--- Layout compatibility ----------------------------------------------//
  
  static bool isLayoutCompatible(ASTContext &C, QualType T1, QualType T2);
  
  /// Check if two enumeration types are layout-compatible.
  static bool isLayoutCompatible(ASTContext &C, EnumDecl *ED1, EnumDecl *ED2) {
    // C++11 [dcl.enum] p8:
    // Two enumeration types are layout-compatible if they have the same
    // underlying type.
    return ED1->isComplete() && ED2->isComplete() &&
           C.hasSameType(ED1->getIntegerType(), ED2->getIntegerType());
  }
  
  /// Check if two fields are layout-compatible.
  static bool isLayoutCompatible(ASTContext &C, FieldDecl *Field1,
                                 FieldDecl *Field2) {
    if (!isLayoutCompatible(C, Field1->getType(), Field2->getType()))
      return false;
  
    if (Field1->isBitField() != Field2->isBitField())
      return false;
  
    if (Field1->isBitField()) {
      // Make sure that the bit-fields are the same length.
      unsigned Bits1 = Field1->getBitWidthValue(C);
      unsigned Bits2 = Field2->getBitWidthValue(C);
  
      if (Bits1 != Bits2)
        return false;
    }
  
    return true;
  }
  
  /// Check if two standard-layout structs are layout-compatible.
  /// (C++11 [class.mem] p17)
  static bool isLayoutCompatibleStruct(ASTContext &C, RecordDecl *RD1,
                                       RecordDecl *RD2) {
    // If both records are C++ classes, check that base classes match.
    if (const CXXRecordDecl *D1CXX = dyn_cast<CXXRecordDecl>(RD1)) {
      // If one of records is a CXXRecordDecl we are in C++ mode,
      // thus the other one is a CXXRecordDecl, too.
      const CXXRecordDecl *D2CXX = cast<CXXRecordDecl>(RD2);
      // Check number of base classes.
      if (D1CXX->getNumBases() != D2CXX->getNumBases())
        return false;
  
      // Check the base classes.
      for (CXXRecordDecl::base_class_const_iterator
                 Base1 = D1CXX->bases_begin(),
             BaseEnd1 = D1CXX->bases_end(),
                Base2 = D2CXX->bases_begin();
           Base1 != BaseEnd1;
           ++Base1, ++Base2) {
        if (!isLayoutCompatible(C, Base1->getType(), Base2->getType()))
          return false;
      }
    } else if (const CXXRecordDecl *D2CXX = dyn_cast<CXXRecordDecl>(RD2)) {
      // If only RD2 is a C++ class, it should have zero base classes.
      if (D2CXX->getNumBases() > 0)
        return false;
    }
  
    // Check the fields.
    RecordDecl::field_iterator Field2 = RD2->field_begin(),
                               Field2End = RD2->field_end(),
                               Field1 = RD1->field_begin(),
                               Field1End = RD1->field_end();
    for ( ; Field1 != Field1End && Field2 != Field2End; ++Field1, ++Field2) {
      if (!isLayoutCompatible(C, *Field1, *Field2))
        return false;
    }
    if (Field1 != Field1End || Field2 != Field2End)
      return false;
  
    return true;
  }
  
  /// Check if two standard-layout unions are layout-compatible.
  /// (C++11 [class.mem] p18)
  static bool isLayoutCompatibleUnion(ASTContext &C, RecordDecl *RD1,
                                      RecordDecl *RD2) {
    llvm::SmallPtrSet<FieldDecl *, 8> UnmatchedFields;
    for (auto *Field2 : RD2->fields())
      UnmatchedFields.insert(Field2);
  
    for (auto *Field1 : RD1->fields()) {
      llvm::SmallPtrSet<FieldDecl *, 8>::iterator
          I = UnmatchedFields.begin(),
          E = UnmatchedFields.end();
  
      for ( ; I != E; ++I) {
        if (isLayoutCompatible(C, Field1, *I)) {
          bool Result = UnmatchedFields.erase(*I);
          (void) Result;
          assert(Result);
          break;
        }
      }
      if (I == E)
        return false;
    }
  
    return UnmatchedFields.empty();
  }
  
  static bool isLayoutCompatible(ASTContext &C, RecordDecl *RD1,
                                 RecordDecl *RD2) {
    if (RD1->isUnion() != RD2->isUnion())
      return false;
  
    if (RD1->isUnion())
      return isLayoutCompatibleUnion(C, RD1, RD2);
    else
      return isLayoutCompatibleStruct(C, RD1, RD2);
  }
  
  /// Check if two types are layout-compatible in C++11 sense.
  static bool isLayoutCompatible(ASTContext &C, QualType T1, QualType T2) {
    if (T1.isNull() || T2.isNull())
      return false;
  
    // C++11 [basic.types] p11:
    // If two types T1 and T2 are the same type, then T1 and T2 are
    // layout-compatible types.
    if (C.hasSameType(T1, T2))
      return true;
  
    T1 = T1.getCanonicalType().getUnqualifiedType();
    T2 = T2.getCanonicalType().getUnqualifiedType();
  
    const Type::TypeClass TC1 = T1->getTypeClass();
    const Type::TypeClass TC2 = T2->getTypeClass();
  
    if (TC1 != TC2)
      return false;
  
    if (TC1 == Type::Enum) {
      return isLayoutCompatible(C,
                                cast<EnumType>(T1)->getDecl(),
                                cast<EnumType>(T2)->getDecl());
    } else if (TC1 == Type::Record) {
      if (!T1->isStandardLayoutType() || !T2->isStandardLayoutType())
        return false;
  
      return isLayoutCompatible(C,
                                cast<RecordType>(T1)->getDecl(),
                                cast<RecordType>(T2)->getDecl());
    }
  
    return false;
  }
  
  //===--- CHECK: pointer_with_type_tag attribute: datatypes should match ----//
  
  /// Given a type tag expression find the type tag itself.
  ///
  /// \param TypeExpr Type tag expression, as it appears in user's code.
  ///
  /// \param VD Declaration of an identifier that appears in a type tag.
  ///
  /// \param MagicValue Type tag magic value.
  ///
  /// \param isConstantEvaluated wether the evalaution should be performed in
  
  /// constant context.
  static bool FindTypeTagExpr(const Expr *TypeExpr, const ASTContext &Ctx,
                              const ValueDecl **VD, uint64_t *MagicValue,
                              bool isConstantEvaluated) {
    while(true) {
      if (!TypeExpr)
        return false;
  
      TypeExpr = TypeExpr->IgnoreParenImpCasts()->IgnoreParenCasts();
  
      switch (TypeExpr->getStmtClass()) {
      case Stmt::UnaryOperatorClass: {
        const UnaryOperator *UO = cast<UnaryOperator>(TypeExpr);
        if (UO->getOpcode() == UO_AddrOf || UO->getOpcode() == UO_Deref) {
          TypeExpr = UO->getSubExpr();
          continue;
        }
        return false;
      }
  
      case Stmt::DeclRefExprClass: {
        const DeclRefExpr *DRE = cast<DeclRefExpr>(TypeExpr);
        *VD = DRE->getDecl();
        return true;
      }
  
      case Stmt::IntegerLiteralClass: {
        const IntegerLiteral *IL = cast<IntegerLiteral>(TypeExpr);
        llvm::APInt MagicValueAPInt = IL->getValue();
        if (MagicValueAPInt.getActiveBits() <= 64) {
          *MagicValue = MagicValueAPInt.getZExtValue();
          return true;
        } else
          return false;
      }
  
      case Stmt::BinaryConditionalOperatorClass:
      case Stmt::ConditionalOperatorClass: {
        const AbstractConditionalOperator *ACO =
            cast<AbstractConditionalOperator>(TypeExpr);
        bool Result;
        if (ACO->getCond()->EvaluateAsBooleanCondition(Result, Ctx,
                                                       isConstantEvaluated)) {
          if (Result)
            TypeExpr = ACO->getTrueExpr();
          else
            TypeExpr = ACO->getFalseExpr();
          continue;
        }
        return false;
      }
  
      case Stmt::BinaryOperatorClass: {
        const BinaryOperator *BO = cast<BinaryOperator>(TypeExpr);
        if (BO->getOpcode() == BO_Comma) {
          TypeExpr = BO->getRHS();
          continue;
        }
        return false;
      }
  
      default:
        return false;
      }
    }
  }
  
  /// Retrieve the C type corresponding to type tag TypeExpr.
  ///
  /// \param TypeExpr Expression that specifies a type tag.
  ///
  /// \param MagicValues Registered magic values.
  ///
  /// \param FoundWrongKind Set to true if a type tag was found, but of a wrong
  ///        kind.
  ///
  /// \param TypeInfo Information about the corresponding C type.
  ///
  /// \param isConstantEvaluated wether the evalaution should be performed in
  /// constant context.
  ///
  /// \returns true if the corresponding C type was found.
  static bool GetMatchingCType(
      const IdentifierInfo *ArgumentKind, const Expr *TypeExpr,
      const ASTContext &Ctx,
      const llvm::DenseMap<Sema::TypeTagMagicValue, Sema::TypeTagData>
          *MagicValues,
      bool &FoundWrongKind, Sema::TypeTagData &TypeInfo,
      bool isConstantEvaluated) {
    FoundWrongKind = false;
  
    // Variable declaration that has type_tag_for_datatype attribute.
    const ValueDecl *VD = nullptr;
  
    uint64_t MagicValue;
  
    if (!FindTypeTagExpr(TypeExpr, Ctx, &VD, &MagicValue, isConstantEvaluated))
      return false;
  
    if (VD) {
      if (TypeTagForDatatypeAttr *I = VD->getAttr<TypeTagForDatatypeAttr>()) {
        if (I->getArgumentKind() != ArgumentKind) {
          FoundWrongKind = true;
          return false;
        }
        TypeInfo.Type = I->getMatchingCType();
        TypeInfo.LayoutCompatible = I->getLayoutCompatible();
        TypeInfo.MustBeNull = I->getMustBeNull();
        return true;
      }
      return false;
    }
  
    if (!MagicValues)
      return false;
  
    llvm::DenseMap<Sema::TypeTagMagicValue,
                   Sema::TypeTagData>::const_iterator I =
        MagicValues->find(std::make_pair(ArgumentKind, MagicValue));
    if (I == MagicValues->end())
      return false;
  
    TypeInfo = I->second;
    return true;
  }
  
  void Sema::RegisterTypeTagForDatatype(const IdentifierInfo *ArgumentKind,
                                        uint64_t MagicValue, QualType Type,
                                        bool LayoutCompatible,
                                        bool MustBeNull) {
    if (!TypeTagForDatatypeMagicValues)
      TypeTagForDatatypeMagicValues.reset(
          new llvm::DenseMap<TypeTagMagicValue, TypeTagData>);
  
    TypeTagMagicValue Magic(ArgumentKind, MagicValue);
    (*TypeTagForDatatypeMagicValues)[Magic] =
        TypeTagData(Type, LayoutCompatible, MustBeNull);
  }
  
  static bool IsSameCharType(QualType T1, QualType T2) {
    const BuiltinType *BT1 = T1->getAs<BuiltinType>();
    if (!BT1)
      return false;
  
    const BuiltinType *BT2 = T2->getAs<BuiltinType>();
    if (!BT2)
      return false;
  
    BuiltinType::Kind T1Kind = BT1->getKind();
    BuiltinType::Kind T2Kind = BT2->getKind();
  
    return (T1Kind == BuiltinType::SChar  && T2Kind == BuiltinType::Char_S) ||
           (T1Kind == BuiltinType::UChar  && T2Kind == BuiltinType::Char_U) ||
           (T1Kind == BuiltinType::Char_U && T2Kind == BuiltinType::UChar) ||
           (T1Kind == BuiltinType::Char_S && T2Kind == BuiltinType::SChar);
  }
  
  void Sema::CheckArgumentWithTypeTag(const ArgumentWithTypeTagAttr *Attr,
                                      const ArrayRef<const Expr *> ExprArgs,
                                      SourceLocation CallSiteLoc) {
    const IdentifierInfo *ArgumentKind = Attr->getArgumentKind();
    bool IsPointerAttr = Attr->getIsPointer();
  
    // Retrieve the argument representing the 'type_tag'.
    unsigned TypeTagIdxAST = Attr->getTypeTagIdx().getASTIndex();
    if (TypeTagIdxAST >= ExprArgs.size()) {
      Diag(CallSiteLoc, diag::err_tag_index_out_of_range)
          << 0 << Attr->getTypeTagIdx().getSourceIndex();
      return;
    }
    const Expr *TypeTagExpr = ExprArgs[TypeTagIdxAST];
    bool FoundWrongKind;
    TypeTagData TypeInfo;
    if (!GetMatchingCType(ArgumentKind, TypeTagExpr, Context,
                          TypeTagForDatatypeMagicValues.get(), FoundWrongKind,
                          TypeInfo, isConstantEvaluated())) {
      if (FoundWrongKind)
        Diag(TypeTagExpr->getExprLoc(),
             diag::warn_type_tag_for_datatype_wrong_kind)
          << TypeTagExpr->getSourceRange();
      return;
    }
  
    // Retrieve the argument representing the 'arg_idx'.
    unsigned ArgumentIdxAST = Attr->getArgumentIdx().getASTIndex();
    if (ArgumentIdxAST >= ExprArgs.size()) {
      Diag(CallSiteLoc, diag::err_tag_index_out_of_range)
          << 1 << Attr->getArgumentIdx().getSourceIndex();
      return;
    }
    const Expr *ArgumentExpr = ExprArgs[ArgumentIdxAST];
    if (IsPointerAttr) {
      // Skip implicit cast of pointer to `void *' (as a function argument).
      if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgumentExpr))
        if (ICE->getType()->isVoidPointerType() &&
            ICE->getCastKind() == CK_BitCast)
          ArgumentExpr = ICE->getSubExpr();
    }
    QualType ArgumentType = ArgumentExpr->getType();
  
    // Passing a `void*' pointer shouldn't trigger a warning.
    if (IsPointerAttr && ArgumentType->isVoidPointerType())
      return;
  
    if (TypeInfo.MustBeNull) {
      // Type tag with matching void type requires a null pointer.
      if (!ArgumentExpr->isNullPointerConstant(Context,
                                               Expr::NPC_ValueDependentIsNotNull)) {
        Diag(ArgumentExpr->getExprLoc(),
             diag::warn_type_safety_null_pointer_required)
            << ArgumentKind->getName()
            << ArgumentExpr->getSourceRange()
            << TypeTagExpr->getSourceRange();
      }
      return;
    }
  
    QualType RequiredType = TypeInfo.Type;
    if (IsPointerAttr)
      RequiredType = Context.getPointerType(RequiredType);
  
    bool mismatch = false;
    if (!TypeInfo.LayoutCompatible) {
      mismatch = !Context.hasSameType(ArgumentType, RequiredType);
  
      // C++11 [basic.fundamental] p1:
      // Plain char, signed char, and unsigned char are three distinct types.
      //
      // But we treat plain `char' as equivalent to `signed char' or `unsigned
      // char' depending on the current char signedness mode.
      if (mismatch)
        if ((IsPointerAttr && IsSameCharType(ArgumentType->getPointeeType(),
                                             RequiredType->getPointeeType())) ||
            (!IsPointerAttr && IsSameCharType(ArgumentType, RequiredType)))
          mismatch = false;
    } else
      if (IsPointerAttr)
        mismatch = !isLayoutCompatible(Context,
                                       ArgumentType->getPointeeType(),
                                       RequiredType->getPointeeType());
      else
        mismatch = !isLayoutCompatible(Context, ArgumentType, RequiredType);
  
    if (mismatch)
      Diag(ArgumentExpr->getExprLoc(), diag::warn_type_safety_type_mismatch)
          << ArgumentType << ArgumentKind
          << TypeInfo.LayoutCompatible << RequiredType
          << ArgumentExpr->getSourceRange()
          << TypeTagExpr->getSourceRange();
  }
  
  void Sema::AddPotentialMisalignedMembers(Expr *E, RecordDecl *RD, ValueDecl *MD,
                                           CharUnits Alignment) {
    MisalignedMembers.emplace_back(E, RD, MD, Alignment);
  }
  
  void Sema::DiagnoseMisalignedMembers() {
    for (MisalignedMember &m : MisalignedMembers) {
      const NamedDecl *ND = m.RD;
      if (ND->getName().empty()) {
        if (const TypedefNameDecl *TD = m.RD->getTypedefNameForAnonDecl())
          ND = TD;
      }
      Diag(m.E->getBeginLoc(), diag::warn_taking_address_of_packed_member)
          << m.MD << ND << m.E->getSourceRange();
    }
    MisalignedMembers.clear();
  }
  
  void Sema::DiscardMisalignedMemberAddress(const Type *T, Expr *E) {
    E = E->IgnoreParens();
    if (!T->isPointerType() && !T->isIntegerType())
      return;
    if (isa<UnaryOperator>(E) &&
        cast<UnaryOperator>(E)->getOpcode() == UO_AddrOf) {
      auto *Op = cast<UnaryOperator>(E)->getSubExpr()->IgnoreParens();
      if (isa<MemberExpr>(Op)) {
        auto MA = llvm::find(MisalignedMembers, MisalignedMember(Op));
        if (MA != MisalignedMembers.end() &&
            (T->isIntegerType() ||
             (T->isPointerType() && (T->getPointeeType()->isIncompleteType() ||
                                     Context.getTypeAlignInChars(
                                         T->getPointeeType()) <= MA->Alignment))))
          MisalignedMembers.erase(MA);
      }
    }
  }
  
  void Sema::RefersToMemberWithReducedAlignment(
      Expr *E,
      llvm::function_ref<void(Expr *, RecordDecl *, FieldDecl *, CharUnits)>
          Action) {
    const auto *ME = dyn_cast<MemberExpr>(E);
    if (!ME)
      return;
  
    // No need to check expressions with an __unaligned-qualified type.
    if (E->getType().getQualifiers().hasUnaligned())
      return;
  
    // For a chain of MemberExpr like "a.b.c.d" this list
    // will keep FieldDecl's like [d, c, b].
    SmallVector<FieldDecl *, 4> ReverseMemberChain;
    const MemberExpr *TopME = nullptr;
    bool AnyIsPacked = false;
    do {
      QualType BaseType = ME->getBase()->getType();
      if (BaseType->isDependentType())
        return;
      if (ME->isArrow())
        BaseType = BaseType->getPointeeType();
      RecordDecl *RD = BaseType->castAs<RecordType>()->getDecl();
      if (RD->isInvalidDecl())
        return;
  
      ValueDecl *MD = ME->getMemberDecl();
      auto *FD = dyn_cast<FieldDecl>(MD);
      // We do not care about non-data members.
      if (!FD || FD->isInvalidDecl())
        return;
  
      AnyIsPacked =
          AnyIsPacked || (RD->hasAttr<PackedAttr>() || MD->hasAttr<PackedAttr>());
      ReverseMemberChain.push_back(FD);
  
      TopME = ME;
      ME = dyn_cast<MemberExpr>(ME->getBase()->IgnoreParens());
    } while (ME);
    assert(TopME && "We did not compute a topmost MemberExpr!");
  
    // Not the scope of this diagnostic.
    if (!AnyIsPacked)
      return;
  
    const Expr *TopBase = TopME->getBase()->IgnoreParenImpCasts();
    const auto *DRE = dyn_cast<DeclRefExpr>(TopBase);
    // TODO: The innermost base of the member expression may be too complicated.
    // For now, just disregard these cases. This is left for future
    // improvement.
    if (!DRE && !isa<CXXThisExpr>(TopBase))
        return;
  
    // Alignment expected by the whole expression.
    CharUnits ExpectedAlignment = Context.getTypeAlignInChars(E->getType());
  
    // No need to do anything else with this case.
    if (ExpectedAlignment.isOne())
      return;
  
    // Synthesize offset of the whole access.
    CharUnits Offset;
    for (auto I = ReverseMemberChain.rbegin(); I != ReverseMemberChain.rend();
         I++) {
      Offset += Context.toCharUnitsFromBits(Context.getFieldOffset(*I));
    }
  
    // Compute the CompleteObjectAlignment as the alignment of the whole chain.
    CharUnits CompleteObjectAlignment = Context.getTypeAlignInChars(
        ReverseMemberChain.back()->getParent()->getTypeForDecl());
  
    // The base expression of the innermost MemberExpr may give
    // stronger guarantees than the class containing the member.
    if (DRE && !TopME->isArrow()) {
      const ValueDecl *VD = DRE->getDecl();
      if (!VD->getType()->isReferenceType())
        CompleteObjectAlignment =
            std::max(CompleteObjectAlignment, Context.getDeclAlign(VD));
    }
  
    // Check if the synthesized offset fulfills the alignment.
    if (Offset % ExpectedAlignment != 0 ||
        // It may fulfill the offset it but the effective alignment may still be
        // lower than the expected expression alignment.
        CompleteObjectAlignment < ExpectedAlignment) {
      // If this happens, we want to determine a sensible culprit of this.
      // Intuitively, watching the chain of member expressions from right to
      // left, we start with the required alignment (as required by the field
      // type) but some packed attribute in that chain has reduced the alignment.
      // It may happen that another packed structure increases it again. But if
      // we are here such increase has not been enough. So pointing the first
      // FieldDecl that either is packed or else its RecordDecl is,
      // seems reasonable.
      FieldDecl *FD = nullptr;
      CharUnits Alignment;
      for (FieldDecl *FDI : ReverseMemberChain) {
        if (FDI->hasAttr<PackedAttr>() ||
            FDI->getParent()->hasAttr<PackedAttr>()) {
          FD = FDI;
          Alignment = std::min(
              Context.getTypeAlignInChars(FD->getType()),
              Context.getTypeAlignInChars(FD->getParent()->getTypeForDecl()));
          break;
        }
      }
      assert(FD && "We did not find a packed FieldDecl!");
      Action(E, FD->getParent(), FD, Alignment);
    }
  }
  
  void Sema::CheckAddressOfPackedMember(Expr *rhs) {
    using namespace std::placeholders;
  
    RefersToMemberWithReducedAlignment(
        rhs, std::bind(&Sema::AddPotentialMisalignedMembers, std::ref(*this), _1,
                       _2, _3, _4));
  }
  