text: //===-- AsmWriter.cpp - Printing LLVM as an assembly file -----------------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is distributed under the University of Illinois Open Source
  // License. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  //
  // This library implements the functionality defined in llvm/Assembly/Writer.h
  //
  // Note that these routines must be extremely tolerant of various errors in the
  // LLVM code, because it can be used for debugging transformations.
  //
  //===----------------------------------------------------------------------===//
  
  #include "llvm/Assembly/Writer.h"
  #include "llvm/Assembly/PrintModulePass.h"
  #include "llvm/Assembly/AsmAnnotationWriter.h"
  #include "llvm/CallingConv.h"
  #include "llvm/Constants.h"
  #include "llvm/DerivedTypes.h"
  #include "llvm/InlineAsm.h"
  #include "llvm/Instruction.h"
  #include "llvm/Instructions.h"
  #include "llvm/LLVMContext.h"
  #include "llvm/Operator.h"
  #include "llvm/Metadata.h"
  #include "llvm/Module.h"
  #include "llvm/ValueSymbolTable.h"
  #include "llvm/TypeSymbolTable.h"
  #include "llvm/ADT/DenseSet.h"
  #include "llvm/ADT/StringExtras.h"
  #include "llvm/ADT/STLExtras.h"
  #include "llvm/Support/CFG.h"
  #include "llvm/Support/Dwarf.h"
  #include "llvm/Support/ErrorHandling.h"
  #include "llvm/Support/MathExtras.h"
  #include "llvm/Support/FormattedStream.h"
  #include <algorithm>
  #include <cctype>
  #include <map>
  using namespace llvm;
  
  // Make virtual table appear in this compilation unit.
  AssemblyAnnotationWriter::~AssemblyAnnotationWriter() {}
  
  //===----------------------------------------------------------------------===//
  // Helper Functions
  //===----------------------------------------------------------------------===//
  
  static const Module *getModuleFromVal(const Value *V) {
    if (const Argument *MA = dyn_cast<Argument>(V))
      return MA->getParent() ? MA->getParent()->getParent() : 0;
  
    if (const BasicBlock *BB = dyn_cast<BasicBlock>(V))
      return BB->getParent() ? BB->getParent()->getParent() : 0;
  
    if (const Instruction *I = dyn_cast<Instruction>(V)) {
      const Function *M = I->getParent() ? I->getParent()->getParent() : 0;
      return M ? M->getParent() : 0;
    }
  
    if (const GlobalValue *GV = dyn_cast<GlobalValue>(V))
      return GV->getParent();
    return 0;
  }
  
  // PrintEscapedString - Print each character of the specified string, escaping
  // it if it is not printable or if it is an escape char.
  static void PrintEscapedString(const StringRef &Name,
                                 raw_ostream &Out) {
    for (unsigned i = 0, e = Name.size(); i != e; ++i) {
      unsigned char C = Name[i];
      if (isprint(C) && C != '\\' && C != '"')
        Out << C;
      else
        Out << '\\' << hexdigit(C >> 4) << hexdigit(C & 0x0F);
    }
  }
  
  enum PrefixType {
    GlobalPrefix,
    LabelPrefix,
    LocalPrefix,
    NoPrefix
  };
  
  /// PrintLLVMName - Turn the specified name into an 'LLVM name', which is either
  /// prefixed with % (if the string only contains simple characters) or is
  /// surrounded with ""'s (if it has special chars in it).  Print it out.
  static void PrintLLVMName(raw_ostream &OS, const StringRef &Name,
                            PrefixType Prefix) {
    assert(Name.data() && "Cannot get empty name!");
    switch (Prefix) {
    default: llvm_unreachable("Bad prefix!");
    case NoPrefix: break;
    case GlobalPrefix: OS << '@'; break;
    case LabelPrefix:  break;
    case LocalPrefix:  OS << '%'; break;
    }
  
    // Scan the name to see if it needs quotes first.
    bool NeedsQuotes = isdigit(Name[0]);
    if (!NeedsQuotes) {
      for (unsigned i = 0, e = Name.size(); i != e; ++i) {
        char C = Name[i];
        if (!isalnum(C) && C != '-' && C != '.' && C != '_') {
          NeedsQuotes = true;
          break;
        }
      }
    }
  
    // If we didn't need any quotes, just write out the name in one blast.
    if (!NeedsQuotes) {
      OS << Name;
      return;
    }
  
    // Okay, we need quotes.  Output the quotes and escape any scary characters as
    // needed.
    OS << '"';
    PrintEscapedString(Name, OS);
    OS << '"';
  }
  
  /// PrintLLVMName - Turn the specified name into an 'LLVM name', which is either
  /// prefixed with % (if the string only contains simple characters) or is
  /// surrounded with ""'s (if it has special chars in it).  Print it out.
  static void PrintLLVMName(raw_ostream &OS, const Value *V) {
    PrintLLVMName(OS, V->getName(),
                  isa<GlobalValue>(V) ? GlobalPrefix : LocalPrefix);
  }
  
  //===----------------------------------------------------------------------===//
  // TypePrinting Class: Type printing machinery
  //===----------------------------------------------------------------------===//
  
  static DenseMap<const Type *, std::string> &getTypeNamesMap(void *M) {
    return *static_cast<DenseMap<const Type *, std::string>*>(M);
  }
  
  void TypePrinting::clear() {
    getTypeNamesMap(TypeNames).clear();
  }
  
  bool TypePrinting::hasTypeName(const Type *Ty) const {
    return getTypeNamesMap(TypeNames).count(Ty);
  }
  
  void TypePrinting::addTypeName(const Type *Ty, const std::string &N) {
    getTypeNamesMap(TypeNames).insert(std::make_pair(Ty, N));
  }
  
  
  TypePrinting::TypePrinting() {
    TypeNames = new DenseMap<const Type *, std::string>();
  }
  
  TypePrinting::~TypePrinting() {
    delete &getTypeNamesMap(TypeNames);
  }
  
  /// CalcTypeName - Write the specified type to the specified raw_ostream, making
  /// use of type names or up references to shorten the type name where possible.
  void TypePrinting::CalcTypeName(const Type *Ty,
                                  SmallVectorImpl<const Type *> &TypeStack,
                                  raw_ostream &OS, bool IgnoreTopLevelName) {
    // Check to see if the type is named.
    if (!IgnoreTopLevelName) {
      DenseMap<const Type *, std::string> &TM = getTypeNamesMap(TypeNames);
      DenseMap<const Type *, std::string>::iterator I = TM.find(Ty);
      if (I != TM.end()) {
        OS << I->second;
        return;
      }
    }
  
    // Check to see if the Type is already on the stack...
    unsigned Slot = 0, CurSize = TypeStack.size();
    while (Slot < CurSize && TypeStack[Slot] != Ty) ++Slot; // Scan for type
  
    // This is another base case for the recursion.  In this case, we know
    // that we have looped back to a type that we have previously visited.
    // Generate the appropriate upreference to handle this.
    if (Slot < CurSize) {
      OS << '\\' << unsigned(CurSize-Slot);     // Here's the upreference
      return;
    }
  
    TypeStack.push_back(Ty);    // Recursive case: Add us to the stack..
  
    switch (Ty->getTypeID()) {
    case Type::VoidTyID:      OS << "void"; break;
    case Type::FloatTyID:     OS << "float"; break;
    case Type::DoubleTyID:    OS << "double"; break;
    case Type::X86_FP80TyID:  OS << "x86_fp80"; break;
    case Type::FP128TyID:     OS << "fp128"; break;
    case Type::PPC_FP128TyID: OS << "ppc_fp128"; break;
    case Type::LabelTyID:     OS << "label"; break;
    case Type::MetadataTyID:  OS << "metadata"; break;
    case Type::IntegerTyID:
      OS << 'i' << cast<IntegerType>(Ty)->getBitWidth();
      break;
  
    case Type::FunctionTyID: {
      const FunctionType *FTy = cast<FunctionType>(Ty);
      CalcTypeName(FTy->getReturnType(), TypeStack, OS);
      OS << " (";
      for (FunctionType::param_iterator I = FTy->param_begin(),
           E = FTy->param_end(); I != E; ++I) {
        if (I != FTy->param_begin())
          OS << ", ";
        CalcTypeName(*I, TypeStack, OS);
      }
      if (FTy->isVarArg()) {
        if (FTy->getNumParams()) OS << ", ";
        OS << "...";
      }
      OS << ')';
      break;
    }
    case Type::StructTyID: {
      const StructType *STy = cast<StructType>(Ty);
      if (STy->isPacked())
        OS << '<';
      OS << "{ ";
      for (StructType::element_iterator I = STy->element_begin(),
           E = STy->element_end(); I != E; ++I) {
        CalcTypeName(*I, TypeStack, OS);
        if (next(I) != STy->element_end())
          OS << ',';
        OS << ' ';
      }
      OS << '}';
      if (STy->isPacked())
        OS << '>';
      break;
    }
    case Type::PointerTyID: {
      const PointerType *PTy = cast<PointerType>(Ty);
      CalcTypeName(PTy->getElementType(), TypeStack, OS);
      if (unsigned AddressSpace = PTy->getAddressSpace())
        OS << " addrspace(" << AddressSpace << ')';
      OS << '*';
      break;
    }
    case Type::ArrayTyID: {
      const ArrayType *ATy = cast<ArrayType>(Ty);
      OS << '[' << ATy->getNumElements() << " x ";
      CalcTypeName(ATy->getElementType(), TypeStack, OS);
      OS << ']';
      break;
    }
    case Type::VectorTyID: {
      const VectorType *PTy = cast<VectorType>(Ty);
      OS << "<" << PTy->getNumElements() << " x ";
      CalcTypeName(PTy->getElementType(), TypeStack, OS);
      OS << '>';
      break;
    }
    case Type::OpaqueTyID:
      OS << "opaque";
      break;
    default:
      OS << "<unrecognized-type>";
      break;
    }
  
    TypeStack.pop_back();       // Remove self from stack.
  }
  
  /// printTypeInt - The internal guts of printing out a type that has a
  /// potentially named portion.
  ///
  void TypePrinting::print(const Type *Ty, raw_ostream &OS,
                           bool IgnoreTopLevelName) {
    // Check to see if the type is named.
    DenseMap<const Type*, std::string> &TM = getTypeNamesMap(TypeNames);
    if (!IgnoreTopLevelName) {
      DenseMap<const Type*, std::string>::iterator I = TM.find(Ty);
      if (I != TM.end()) {
        OS << I->second;
        return;
      }
    }
  
    // Otherwise we have a type that has not been named but is a derived type.
    // Carefully recurse the type hierarchy to print out any contained symbolic
    // names.
    SmallVector<const Type *, 16> TypeStack;
    std::string TypeName;
  
    raw_string_ostream TypeOS(TypeName);
    CalcTypeName(Ty, TypeStack, TypeOS, IgnoreTopLevelName);
    OS << TypeOS.str();
  
    // Cache type name for later use.
    if (!IgnoreTopLevelName)
      TM.insert(std::make_pair(Ty, TypeOS.str()));
  }
  
  namespace {
    class TypeFinder {
      // To avoid walking constant expressions multiple times and other IR
      // objects, we keep several helper maps.
      DenseSet<const Value*> VisitedConstants;
      DenseSet<const Type*> VisitedTypes;
  
      TypePrinting &TP;
      std::vector<const Type*> &NumberedTypes;
    public:
      TypeFinder(TypePrinting &tp, std::vector<const Type*> &numberedTypes)
        : TP(tp), NumberedTypes(numberedTypes) {}
  
      void Run(const Module &M) {
        // Get types from the type symbol table.  This gets opaque types referened
        // only through derived named types.
        const TypeSymbolTable &ST = M.getTypeSymbolTable();
        for (TypeSymbolTable::const_iterator TI = ST.begin(), E = ST.end();
             TI != E; ++TI)
          IncorporateType(TI->second);
  
        // Get types from global variables.
        for (Module::const_global_iterator I = M.global_begin(),
             E = M.global_end(); I != E; ++I) {
          IncorporateType(I->getType());
          if (I->hasInitializer())
            IncorporateValue(I->getInitializer());
        }
  
        // Get types from aliases.
        for (Module::const_alias_iterator I = M.alias_begin(),
             E = M.alias_end(); I != E; ++I) {
          IncorporateType(I->getType());
          IncorporateValue(I->getAliasee());
        }
  
        // Get types from functions.
        for (Module::const_iterator FI = M.begin(), E = M.end(); FI != E; ++FI) {
          IncorporateType(FI->getType());
  
          for (Function::const_iterator BB = FI->begin(), E = FI->end();
               BB != E;++BB)
            for (BasicBlock::const_iterator II = BB->begin(),
                 E = BB->end(); II != E; ++II) {
              const Instruction &I = *II;
              // Incorporate the type of the instruction and all its operands.
              IncorporateType(I.getType());
              for (User::const_op_iterator OI = I.op_begin(), OE = I.op_end();
                   OI != OE; ++OI)
                IncorporateValue(*OI);
            }
        }
      }
  
    private:
      void IncorporateType(const Type *Ty) {
        // Check to see if we're already visited this type.
        if (!VisitedTypes.insert(Ty).second)
          return;
  
        // If this is a structure or opaque type, add a name for the type.
        if (((isa<StructType>(Ty) && cast<StructType>(Ty)->getNumElements())
              || isa<OpaqueType>(Ty)) && !TP.hasTypeName(Ty)) {
          TP.addTypeName(Ty, "%"+utostr(unsigned(NumberedTypes.size())));
          NumberedTypes.push_back(Ty);
        }
  
        // Recursively walk all contained types.
        for (Type::subtype_iterator I = Ty->subtype_begin(),
             E = Ty->subtype_end(); I != E; ++I)
          IncorporateType(*I);
      }
  
      /// IncorporateValue - This method is used to walk operand lists finding
      /// types hiding in constant expressions and other operands that won't be
      /// walked in other ways.  GlobalValues, basic blocks, instructions, and
      /// inst operands are all explicitly enumerated.
      void IncorporateValue(const Value *V) {
        if (V == 0 || !isa<Constant>(V) || isa<GlobalValue>(V)) return;
  
        // Already visited?
        if (!VisitedConstants.insert(V).second)
          return;
  
        // Check this type.
        IncorporateType(V->getType());
  
        // Look in operands for types.
        const Constant *C = cast<Constant>(V);
        for (Constant::const_op_iterator I = C->op_begin(),
             E = C->op_end(); I != E;++I)
          IncorporateValue(*I);
      }
    };
  } // end anonymous namespace
  
  
  /// AddModuleTypesToPrinter - Add all of the symbolic type names for types in
  /// the specified module to the TypePrinter and all numbered types to it and the
  /// NumberedTypes table.
  static void AddModuleTypesToPrinter(TypePrinting &TP,
                                      std::vector<const Type*> &NumberedTypes,
                                      const Module *M) {
    if (M == 0) return;
  
    // If the module has a symbol table, take all global types and stuff their
    // names into the TypeNames map.
    const TypeSymbolTable &ST = M->getTypeSymbolTable();
    for (TypeSymbolTable::const_iterator TI = ST.begin(), E = ST.end();
         TI != E; ++TI) {
      const Type *Ty = cast<Type>(TI->second);
  
      // As a heuristic, don't insert pointer to primitive types, because
      // they are used too often to have a single useful name.
      if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) {
        const Type *PETy = PTy->getElementType();
        if ((PETy->isPrimitiveType() || PETy->isInteger()) &&
            !isa<OpaqueType>(PETy))
          continue;
      }
  
      // Likewise don't insert primitives either.
      if (Ty->isInteger() || Ty->isPrimitiveType())
        continue;
  
      // Get the name as a string and insert it into TypeNames.
      std::string NameStr;
      raw_string_ostream NameROS(NameStr);
      formatted_raw_ostream NameOS(NameROS);
      PrintLLVMName(NameOS, TI->first, LocalPrefix);
      NameOS.flush();
      TP.addTypeName(Ty, NameStr);
    }
  
    // Walk the entire module to find references to unnamed structure and opaque
    // types.  This is required for correctness by opaque types (because multiple
    // uses of an unnamed opaque type needs to be referred to by the same ID) and
    // it shrinks complex recursive structure types substantially in some cases.
    TypeFinder(TP, NumberedTypes).Run(*M);
  }
  
  
  /// WriteTypeSymbolic - This attempts to write the specified type as a symbolic
  /// type, iff there is an entry in the modules symbol table for the specified
  /// type or one of it's component types.
  ///
  void llvm::WriteTypeSymbolic(raw_ostream &OS, const Type *Ty, const Module *M) {
    TypePrinting Printer;
    std::vector<const Type*> NumberedTypes;
    AddModuleTypesToPrinter(Printer, NumberedTypes, M);
    Printer.print(Ty, OS);
  }
  
  //===----------------------------------------------------------------------===//
  // SlotTracker Class: Enumerate slot numbers for unnamed values
  //===----------------------------------------------------------------------===//
  
  namespace {
  
  /// This class provides computation of slot numbers for LLVM Assembly writing.
  ///
  class SlotTracker {
  public:
    /// ValueMap - A mapping of Values to slot numbers.
    typedef DenseMap<const Value*, unsigned> ValueMap;
  
  private:
    /// TheModule - The module for which we are holding slot numbers.
    const Module* TheModule;
  
    /// TheFunction - The function for which we are holding slot numbers.
    const Function* TheFunction;
    bool FunctionProcessed;
  
    /// TheMDNode - The MDNode for which we are holding slot numbers.
    const MDNode *TheMDNode;
  
    /// TheNamedMDNode - The MDNode for which we are holding slot numbers.
    const NamedMDNode *TheNamedMDNode;
  
    /// mMap - The TypePlanes map for the module level data.
    ValueMap mMap;
    unsigned mNext;
  
    /// fMap - The TypePlanes map for the function level data.
    ValueMap fMap;
    unsigned fNext;
  
    /// mdnMap - Map for MDNodes.
    ValueMap mdnMap;
    unsigned mdnNext;
  public:
    /// Construct from a module
    explicit SlotTracker(const Module *M);
    /// Construct from a function, starting out in incorp state.
    explicit SlotTracker(const Function *F);
    /// Construct from a mdnode.
    explicit SlotTracker(const MDNode *N);
    /// Construct from a named mdnode.
    explicit SlotTracker(const NamedMDNode *N);
  
    /// Return the slot number of the specified value in it's type
    /// plane.  If something is not in the SlotTracker, return -1.
    int getLocalSlot(const Value *V);
    int getGlobalSlot(const GlobalValue *V);
    int getMetadataSlot(const MDNode *N);
  
    /// If you'd like to deal with a function instead of just a module, use
    /// this method to get its data into the SlotTracker.
    void incorporateFunction(const Function *F) {
      TheFunction = F;
      FunctionProcessed = false;
    }
  
    /// After calling incorporateFunction, use this method to remove the
    /// most recently incorporated function from the SlotTracker. This
    /// will reset the state of the machine back to just the module contents.
    void purgeFunction();
  
    /// MDNode map iterators.
    ValueMap::iterator mdnBegin() { return mdnMap.begin(); }
    ValueMap::iterator mdnEnd() { return mdnMap.end(); }
    unsigned mdnSize() const { return mdnMap.size(); }
    bool mdnEmpty() const { return mdnMap.empty(); }
  
    /// This function does the actual initialization.
    inline void initialize();
  
    // Implementation Details
  private:
    /// CreateModuleSlot - Insert the specified GlobalValue* into the slot table.
    void CreateModuleSlot(const GlobalValue *V);
  
    /// CreateMetadataSlot - Insert the specified MDNode* into the slot table.
    void CreateMetadataSlot(const MDNode *N);
  
    /// CreateFunctionSlot - Insert the specified Value* into the slot table.
    void CreateFunctionSlot(const Value *V);
  
    /// Add all of the module level global variables (and their initializers)
    /// and function declarations, but not the contents of those functions.
    void processModule();
  
    /// Add all of the functions arguments, basic blocks, and instructions.
    void processFunction();
  
    /// Add all MDNode operands.
    void processMDNode();
  
    /// Add all MDNode operands.
    void processNamedMDNode();
  
    SlotTracker(const SlotTracker &);  // DO NOT IMPLEMENT
    void operator=(const SlotTracker &);  // DO NOT IMPLEMENT
  };
  
  }  // end anonymous namespace
  
  
  static SlotTracker *createSlotTracker(const Value *V) {
    if (const Argument *FA = dyn_cast<Argument>(V))
      return new SlotTracker(FA->getParent());
  
    if (const Instruction *I = dyn_cast<Instruction>(V))
      return new SlotTracker(I->getParent()->getParent());
  
    if (const BasicBlock *BB = dyn_cast<BasicBlock>(V))
      return new SlotTracker(BB->getParent());
  
    if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(V))
      return new SlotTracker(GV->getParent());
  
    if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(V))
      return new SlotTracker(GA->getParent());
  
    if (const Function *Func = dyn_cast<Function>(V))
      return new SlotTracker(Func);
  
    return 0;
  }
  
  #if 0
  #define ST_DEBUG(X) errs() << X
  #else
  #define ST_DEBUG(X)
  #endif
  
  // Module level constructor. Causes the contents of the Module (sans functions)
  // to be added to the slot table.
  SlotTracker::SlotTracker(const Module *M)
    : TheModule(M), TheFunction(0), FunctionProcessed(false), TheMDNode(0),
      TheNamedMDNode(0), mNext(0), fNext(0),  mdnNext(0) {
  }
  
  // Function level constructor. Causes the contents of the Module and the one
  // function provided to be added to the slot table.
  SlotTracker::SlotTracker(const Function *F)
    : TheModule(F ? F->getParent() : 0), TheFunction(F), FunctionProcessed(false),
      TheMDNode(0), TheNamedMDNode(0), mNext(0), fNext(0), mdnNext(0) {
  }
  
  // Constructor to handle single MDNode.
  SlotTracker::SlotTracker(const MDNode *C)
    : TheModule(0), TheFunction(0), FunctionProcessed(false), TheMDNode(C),
      TheNamedMDNode(0), mNext(0), fNext(0),  mdnNext(0) {
  }
  
  // Constructor to handle single NamedMDNode.
  SlotTracker::SlotTracker(const NamedMDNode *N)
    : TheModule(0), TheFunction(0), FunctionProcessed(false), TheMDNode(0),
      TheNamedMDNode(N), mNext(0), fNext(0),  mdnNext(0) {
  }
  
  inline void SlotTracker::initialize() {
    if (TheModule) {
      processModule();
      TheModule = 0; ///< Prevent re-processing next time we're called.
    }
  
    if (TheFunction && !FunctionProcessed)
      processFunction();
  
    if (TheMDNode)
      processMDNode();
  
    if (TheNamedMDNode)
      processNamedMDNode();
  }
  
  // Iterate through all the global variables, functions, and global
  // variable initializers and create slots for them.
  void SlotTracker::processModule() {
    ST_DEBUG("begin processModule!\n");
  
    // Add all of the unnamed global variables to the value table.
    for (Module::const_global_iterator I = TheModule->global_begin(),
           E = TheModule->global_end(); I != E; ++I) {
      if (!I->hasName())
        CreateModuleSlot(I);
      if (I->hasInitializer()) {
        if (MDNode *N = dyn_cast<MDNode>(I->getInitializer()))
          CreateMetadataSlot(N);
      }
    }
  
    // Add metadata used by named metadata.
    for (Module::const_named_metadata_iterator
           I = TheModule->named_metadata_begin(),
           E = TheModule->named_metadata_end(); I != E; ++I) {
      const NamedMDNode *NMD = I;
      for (unsigned i = 0, e = NMD->getNumElements(); i != e; ++i) {
        MDNode *MD = dyn_cast_or_null<MDNode>(NMD->getElement(i));
        if (MD)
          CreateMetadataSlot(MD);
      }
    }
  
    // Add all the unnamed functions to the table.
    for (Module::const_iterator I = TheModule->begin(), E = TheModule->end();
         I != E; ++I)
      if (!I->hasName())
        CreateModuleSlot(I);
  
    ST_DEBUG("end processModule!\n");
  }
  
  // Process the arguments, basic blocks, and instructions  of a function.
  void SlotTracker::processFunction() {
    ST_DEBUG("begin processFunction!\n");
    fNext = 0;
  
    // Add all the function arguments with no names.
    for(Function::const_arg_iterator AI = TheFunction->arg_begin(),
        AE = TheFunction->arg_end(); AI != AE; ++AI)
      if (!AI->hasName())
        CreateFunctionSlot(AI);
  
    ST_DEBUG("Inserting Instructions:\n");
  
    MetadataContext &TheMetadata = TheFunction->getContext().getMetadata();
    typedef SmallVector<std::pair<unsigned, TrackingVH<MDNode> >, 2> MDMapTy;
    MDMapTy MDs;
  
    // Add all of the basic blocks and instructions with no names.
    for (Function::const_iterator BB = TheFunction->begin(),
         E = TheFunction->end(); BB != E; ++BB) {
      if (!BB->hasName())
        CreateFunctionSlot(BB);
      for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I != E;
           ++I) {
        if (I->getType() != Type::getVoidTy(TheFunction->getContext()) &&
            !I->hasName())
          CreateFunctionSlot(I);
        for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
          if (MDNode *N = dyn_cast_or_null<MDNode>(I->getOperand(i)))
            CreateMetadataSlot(N);
  
        // Process metadata attached with this instruction.
        MDs.clear();
        TheMetadata.getMDs(I, MDs);
        for (MDMapTy::const_iterator MI = MDs.begin(), ME = MDs.end(); MI != ME; 
             ++MI)
          CreateMetadataSlot(MI->second);
      }
    }
  
    FunctionProcessed = true;
  
    ST_DEBUG("end processFunction!\n");
  }
  
  /// processMDNode - Process TheMDNode.
  void SlotTracker::processMDNode() {
    ST_DEBUG("begin processMDNode!\n");
    mdnNext = 0;
    CreateMetadataSlot(TheMDNode);
    TheMDNode = 0;
    ST_DEBUG("end processMDNode!\n");
  }
  
  /// processNamedMDNode - Process TheNamedMDNode.
  void SlotTracker::processNamedMDNode() {
    ST_DEBUG("begin processNamedMDNode!\n");
    mdnNext = 0;
    for (unsigned i = 0, e = TheNamedMDNode->getNumElements(); i != e; ++i) {
      MDNode *MD = dyn_cast_or_null<MDNode>(TheNamedMDNode->getElement(i));
      if (MD)
        CreateMetadataSlot(MD);
    }
    TheNamedMDNode = 0;
    ST_DEBUG("end processNamedMDNode!\n");
  }
  
  /// Clean up after incorporating a function. This is the only way to get out of
  /// the function incorporation state that affects get*Slot/Create*Slot. Function
  /// incorporation state is indicated by TheFunction != 0.
  void SlotTracker::purgeFunction() {
    ST_DEBUG("begin purgeFunction!\n");
    fMap.clear(); // Simply discard the function level map
    TheFunction = 0;
    FunctionProcessed = false;
    ST_DEBUG("end purgeFunction!\n");
  }
  
  /// getGlobalSlot - Get the slot number of a global value.
  int SlotTracker::getGlobalSlot(const GlobalValue *V) {
    // Check for uninitialized state and do lazy initialization.
    initialize();
  
    // Find the type plane in the module map
    ValueMap::iterator MI = mMap.find(V);
    return MI == mMap.end() ? -1 : (int)MI->second;
  }
  
  /// getGlobalSlot - Get the slot number of a MDNode.
  int SlotTracker::getMetadataSlot(const MDNode *N) {
    // Check for uninitialized state and do lazy initialization.
    initialize();
  
    // Find the type plane in the module map
    ValueMap::iterator MI = mdnMap.find(N);
    return MI == mdnMap.end() ? -1 : (int)MI->second;
  }
  
  
  /// getLocalSlot - Get the slot number for a value that is local to a function.
  int SlotTracker::getLocalSlot(const Value *V) {
    assert(!isa<Constant>(V) && "Can't get a constant or global slot with this!");
  
    // Check for uninitialized state and do lazy initialization.
    initialize();
  
    ValueMap::iterator FI = fMap.find(V);
    return FI == fMap.end() ? -1 : (int)FI->second;
  }
  
  
  /// CreateModuleSlot - Insert the specified GlobalValue* into the slot table.
  void SlotTracker::CreateModuleSlot(const GlobalValue *V) {
    assert(V && "Can't insert a null Value into SlotTracker!");
    assert(V->getType() != Type::getVoidTy(V->getContext()) &&
           "Doesn't need a slot!");
    assert(!V->hasName() && "Doesn't need a slot!");
  
    unsigned DestSlot = mNext++;
    mMap[V] = DestSlot;
  
    ST_DEBUG("  Inserting value [" << V->getType() << "] = " << V << " slot=" <<
             DestSlot << " [");
    // G = Global, F = Function, A = Alias, o = other
    ST_DEBUG((isa<GlobalVariable>(V) ? 'G' :
              (isa<Function>(V) ? 'F' :
               (isa<GlobalAlias>(V) ? 'A' : 'o'))) << "]\n");
  }
  
  /// CreateSlot - Create a new slot for the specified value if it has no name.
  void SlotTracker::CreateFunctionSlot(const Value *V) {
    assert(V->getType() != Type::getVoidTy(TheFunction->getContext()) &&
           !V->hasName() && "Doesn't need a slot!");
  
    unsigned DestSlot = fNext++;
    fMap[V] = DestSlot;
  
    // G = Global, F = Function, o = other
    ST_DEBUG("  Inserting value [" << V->getType() << "] = " << V << " slot=" <<
             DestSlot << " [o]\n");
  }
  
  /// CreateModuleSlot - Insert the specified MDNode* into the slot table.
  void SlotTracker::CreateMetadataSlot(const MDNode *N) {
    assert(N && "Can't insert a null Value into SlotTracker!");
  
    ValueMap::iterator I = mdnMap.find(N);
    if (I != mdnMap.end())
      return;
  
    unsigned DestSlot = mdnNext++;
    mdnMap[N] = DestSlot;
  
    for (unsigned i = 0, e = N->getNumElements(); i != e; ++i) {
      const Value *TV = N->getElement(i);
      if (TV)
        if (const MDNode *N2 = dyn_cast<MDNode>(TV))
          CreateMetadataSlot(N2);
    }
  }
  
  //===----------------------------------------------------------------------===//
  // AsmWriter Implementation
  //===----------------------------------------------------------------------===//
  
  static void WriteAsOperandInternal(raw_ostream &Out, const Value *V,
                                     TypePrinting *TypePrinter,
                                     SlotTracker *Machine);
  
  
  
  static const char *getPredicateText(unsigned predicate) {
    const char * pred = "unknown";
    switch (predicate) {
      case FCmpInst::FCMP_FALSE: pred = "false"; break;
      case FCmpInst::FCMP_OEQ:   pred = "oeq"; break;
      case FCmpInst::FCMP_OGT:   pred = "ogt"; break;
      case FCmpInst::FCMP_OGE:   pred = "oge"; break;
      case FCmpInst::FCMP_OLT:   pred = "olt"; break;
      case FCmpInst::FCMP_OLE:   pred = "ole"; break;
      case FCmpInst::FCMP_ONE:   pred = "one"; break;
      case FCmpInst::FCMP_ORD:   pred = "ord"; break;
      case FCmpInst::FCMP_UNO:   pred = "uno"; break;
      case FCmpInst::FCMP_UEQ:   pred = "ueq"; break;
      case FCmpInst::FCMP_UGT:   pred = "ugt"; break;
      case FCmpInst::FCMP_UGE:   pred = "uge"; break;
      case FCmpInst::FCMP_ULT:   pred = "ult"; break;
      case FCmpInst::FCMP_ULE:   pred = "ule"; break;
      case FCmpInst::FCMP_UNE:   pred = "une"; break;
      case FCmpInst::FCMP_TRUE:  pred = "true"; break;
      case ICmpInst::ICMP_EQ:    pred = "eq"; break;
      case ICmpInst::ICMP_NE:    pred = "ne"; break;
      case ICmpInst::ICMP_SGT:   pred = "sgt"; break;
      case ICmpInst::ICMP_SGE:   pred = "sge"; break;
      case ICmpInst::ICMP_SLT:   pred = "slt"; break;
      case ICmpInst::ICMP_SLE:   pred = "sle"; break;
      case ICmpInst::ICMP_UGT:   pred = "ugt"; break;
      case ICmpInst::ICMP_UGE:   pred = "uge"; break;
      case ICmpInst::ICMP_ULT:   pred = "ult"; break;
      case ICmpInst::ICMP_ULE:   pred = "ule"; break;
    }
    return pred;
  }
  
  static void WriteMDNodeComment(const MDNode *Node,
  			       formatted_raw_ostream &Out) {
    if (Node->getNumElements() < 1)
      return;
    ConstantInt *CI = dyn_cast_or_null<ConstantInt>(Node->getElement(0));
    if (!CI) return;
    unsigned Val = CI->getZExtValue();
    unsigned Tag = Val & ~LLVMDebugVersionMask;
    if (Val >= LLVMDebugVersion) {
      if (Tag == dwarf::DW_TAG_auto_variable)
        Out << "; [ DW_TAG_auto_variable ]";
      else if (Tag == dwarf::DW_TAG_arg_variable)
        Out << "; [ DW_TAG_arg_variable ]";
      else if (Tag == dwarf::DW_TAG_return_variable)
        Out << "; [ DW_TAG_return_variable ]";
      else if (Tag == dwarf::DW_TAG_vector_type)
        Out << "; [ DW_TAG_vector_type ]";
      else if (Tag == dwarf::DW_TAG_user_base)
        Out << "; [ DW_TAG_user_base ]";
      else
        Out << "; [" << dwarf::TagString(Tag) << " ]";
    }
  }
  
  static void WriteMDNodes(formatted_raw_ostream &Out, TypePrinting &TypePrinter,
                           SlotTracker &Machine) {
    SmallVector<const MDNode *, 16> Nodes;
    Nodes.resize(Machine.mdnSize());
    for (SlotTracker::ValueMap::iterator I =
           Machine.mdnBegin(), E = Machine.mdnEnd(); I != E; ++I)
      Nodes[I->second] = cast<MDNode>(I->first);
  
    for (unsigned i = 0, e = Nodes.size(); i != e; ++i) {
      Out << '!' << i << " = metadata ";
      const MDNode *Node = Nodes[i];
      Out << "!{";
      for (unsigned mi = 0, me = Node->getNumElements(); mi != me; ++mi) {
        const Value *V = Node->getElement(mi);
        if (!V)
          Out << "null";
        else if (const MDNode *N = dyn_cast<MDNode>(V)) {
          Out << "metadata ";
          Out << '!' << Machine.getMetadataSlot(N);
        }
        else {
          TypePrinter.print(V->getType(), Out);
          Out << ' ';
          WriteAsOperandInternal(Out, Node->getElement(mi), 
                                 &TypePrinter, &Machine);
        }
        if (mi + 1 != me)
          Out << ", ";
      }
  
      Out << "}";
      WriteMDNodeComment(Node, Out);
      Out << "\n";
    }
  }
  
  static void WriteOptimizationInfo(raw_ostream &Out, const User *U) {
    if (const OverflowingBinaryOperator *OBO =
          dyn_cast<OverflowingBinaryOperator>(U)) {
      if (OBO->hasNoUnsignedWrap())
        Out << " nuw";
      if (OBO->hasNoSignedWrap())
        Out << " nsw";
    } else if (const SDivOperator *Div = dyn_cast<SDivOperator>(U)) {
      if (Div->isExact())
        Out << " exact";
    } else if (const GEPOperator *GEP = dyn_cast<GEPOperator>(U)) {
      if (GEP->isInBounds())
        Out << " inbounds";
    }
  }
  
  static void WriteConstantInt(raw_ostream &Out, const Constant *CV,
                               TypePrinting &TypePrinter, SlotTracker *Machine) {
    if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
      if (CI->getType() == Type::getInt1Ty(CV->getContext())) {
        Out << (CI->getZExtValue() ? "true" : "false");
        return;
      }
      Out << CI->getValue();
      return;
    }
  
    if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
      if (&CFP->getValueAPF().getSemantics() == &APFloat::IEEEdouble ||
          &CFP->getValueAPF().getSemantics() == &APFloat::IEEEsingle) {
        // We would like to output the FP constant value in exponential notation,
        // but we cannot do this if doing so will lose precision.  Check here to
        // make sure that we only output it in exponential format if we can parse
        // the value back and get the same value.
        //
        bool ignored;
        bool isDouble = &CFP->getValueAPF().getSemantics()==&APFloat::IEEEdouble;
        double Val = isDouble ? CFP->getValueAPF().convertToDouble() :
                                CFP->getValueAPF().convertToFloat();
        std::string StrVal = ftostr(CFP->getValueAPF());
  
        // Check to make sure that the stringized number is not some string like
        // "Inf" or NaN, that atof will accept, but the lexer will not.  Check
        // that the string matches the "[-+]?[0-9]" regex.
        //
        if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
            ((StrVal[0] == '-' || StrVal[0] == '+') &&
             (StrVal[1] >= '0' && StrVal[1] <= '9'))) {
          // Reparse stringized version!
          if (atof(StrVal.c_str()) == Val) {
            Out << StrVal;
            return;
          }
        }
        // Otherwise we could not reparse it to exactly the same value, so we must
        // output the string in hexadecimal format!  Note that loading and storing
        // floating point types changes the bits of NaNs on some hosts, notably
        // x86, so we must not use these types.
        assert(sizeof(double) == sizeof(uint64_t) &&
               "assuming that double is 64 bits!");
        char Buffer[40];
        APFloat apf = CFP->getValueAPF();
        // Floats are represented in ASCII IR as double, convert.
        if (!isDouble)
          apf.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
                            &ignored);
        Out << "0x" <<
                utohex_buffer(uint64_t(apf.bitcastToAPInt().getZExtValue()),
                              Buffer+40);
        return;
      }
  
      // Some form of long double.  These appear as a magic letter identifying
      // the type, then a fixed number of hex digits.
      Out << "0x";
      if (&CFP->getValueAPF().getSemantics() == &APFloat::x87DoubleExtended) {
        Out << 'K';
        // api needed to prevent premature destruction
        APInt api = CFP->getValueAPF().bitcastToAPInt();
        const uint64_t* p = api.getRawData();
        uint64_t word = p[1];
        int shiftcount=12;
        int width = api.getBitWidth();
        for (int j=0; j<width; j+=4, shiftcount-=4) {
          unsigned int nibble = (word>>shiftcount) & 15;
          if (nibble < 10)
            Out << (unsigned char)(nibble + '0');
          else
            Out << (unsigned char)(nibble - 10 + 'A');
          if (shiftcount == 0 && j+4 < width) {
            word = *p;
            shiftcount = 64;
            if (width-j-4 < 64)
              shiftcount = width-j-4;
          }
        }
        return;
      } else if (&CFP->getValueAPF().getSemantics() == &APFloat::IEEEquad)
        Out << 'L';
      else if (&CFP->getValueAPF().getSemantics() == &APFloat::PPCDoubleDouble)
        Out << 'M';
      else
        llvm_unreachable("Unsupported floating point type");
      // api needed to prevent premature destruction
      APInt api = CFP->getValueAPF().bitcastToAPInt();
      const uint64_t* p = api.getRawData();
      uint64_t word = *p;
      int shiftcount=60;
      int width = api.getBitWidth();
      for (int j=0; j<width; j+=4, shiftcount-=4) {
        unsigned int nibble = (word>>shiftcount) & 15;
        if (nibble < 10)
          Out << (unsigned char)(nibble + '0');
        else
          Out << (unsigned char)(nibble - 10 + 'A');
        if (shiftcount == 0 && j+4 < width) {
          word = *(++p);
          shiftcount = 64;
          if (width-j-4 < 64)
            shiftcount = width-j-4;
        }
      }
      return;
    }
  
    if (isa<ConstantAggregateZero>(CV)) {
      Out << "zeroinitializer";
      return;
    }
    
    if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) {
      Out << "blockaddress(";
      WriteAsOperandInternal(Out, BA->getFunction(), &TypePrinter, Machine);
      Out << ", ";
      WriteAsOperandInternal(Out, BA->getBasicBlock(), &TypePrinter, Machine);
      Out << ")";
      return;
    }
  
    if (const ConstantArray *CA = dyn_cast<ConstantArray>(CV)) {
      // As a special case, print the array as a string if it is an array of
      // i8 with ConstantInt values.
      //
      const Type *ETy = CA->getType()->getElementType();
      if (CA->isString()) {
        Out << "c\"";
        PrintEscapedString(CA->getAsString(), Out);
        Out << '"';
      } else {                // Cannot output in string format...
        Out << '[';
        if (CA->getNumOperands()) {
          TypePrinter.print(ETy, Out);
          Out << ' ';
          WriteAsOperandInternal(Out, CA->getOperand(0),
                                 &TypePrinter, Machine);
          for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i) {
            Out << ", ";
            TypePrinter.print(ETy, Out);
            Out << ' ';
            WriteAsOperandInternal(Out, CA->getOperand(i), &TypePrinter, Machine);
          }
        }
        Out << ']';
      }
      return;
    }
  
    if (const ConstantStruct *CS = dyn_cast<ConstantStruct>(CV)) {
      if (CS->getType()->isPacked())
        Out << '<';
      Out << '{';
      unsigned N = CS->getNumOperands();
      if (N) {
        Out << ' ';
        TypePrinter.print(CS->getOperand(0)->getType(), Out);
        Out << ' ';
  
        WriteAsOperandInternal(Out, CS->getOperand(0), &TypePrinter, Machine);
  
        for (unsigned i = 1; i < N; i++) {
          Out << ", ";
          TypePrinter.print(CS->getOperand(i)->getType(), Out);
          Out << ' ';
  
          WriteAsOperandInternal(Out, CS->getOperand(i), &TypePrinter, Machine);
        }
        Out << ' ';
      }
  
      Out << '}';
      if (CS->getType()->isPacked())
        Out << '>';
      return;
    }
  
    if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
      const Type *ETy = CP->getType()->getElementType();
      assert(CP->getNumOperands() > 0 &&
             "Number of operands for a PackedConst must be > 0");
      Out << '<';
      TypePrinter.print(ETy, Out);
      Out << ' ';
      WriteAsOperandInternal(Out, CP->getOperand(0), &TypePrinter, Machine);
      for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
        Out << ", ";
        TypePrinter.print(ETy, Out);
        Out << ' ';
        WriteAsOperandInternal(Out, CP->getOperand(i), &TypePrinter, Machine);
      }
      Out << '>';
      return;
    }
  
    if (isa<ConstantPointerNull>(CV)) {
      Out << "null";
      return;
    }
  
    if (isa<UndefValue>(CV)) {
      Out << "undef";
      return;
    }
  
    if (const MDNode *Node = dyn_cast<MDNode>(CV)) {
      Out << "!" << Machine->getMetadataSlot(Node);
      return;
    }
  
    if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
      Out << CE->getOpcodeName();
      WriteOptimizationInfo(Out, CE);
      if (CE->isCompare())
        Out << ' ' << getPredicateText(CE->getPredicate());
      Out << " (";
  
      for (User::const_op_iterator OI=CE->op_begin(); OI != CE->op_end(); ++OI) {
        TypePrinter.print((*OI)->getType(), Out);
        Out << ' ';
        WriteAsOperandInternal(Out, *OI, &TypePrinter, Machine);
        if (OI+1 != CE->op_end())
          Out << ", ";
      }
  
      if (CE->hasIndices()) {
        const SmallVector<unsigned, 4> &Indices = CE->getIndices();
        for (unsigned i = 0, e = Indices.size(); i != e; ++i)
          Out << ", " << Indices[i];
      }
  
      if (CE->isCast()) {
        Out << " to ";
        TypePrinter.print(CE->getType(), Out);
      }
  
      Out << ')';
      return;
    }
  
    Out << "<placeholder or erroneous Constant>";
  }
  
  
  /// WriteAsOperand - Write the name of the specified value out to the specified
  /// ostream.  This can be useful when you just want to print int %reg126, not
  /// the whole instruction that generated it.
  ///
  static void WriteAsOperandInternal(raw_ostream &Out, const Value *V,
                                     TypePrinting *TypePrinter,
                                     SlotTracker *Machine) {
    if (V->hasName()) {
      PrintLLVMName(Out, V);
      return;
    }
  
    const Constant *CV = dyn_cast<Constant>(V);
    if (CV && !isa<GlobalValue>(CV)) {
      assert(TypePrinter && "Constants require TypePrinting!");
      WriteConstantInt(Out, CV, *TypePrinter, Machine);
      return;
    }
  
    if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
      Out << "asm ";
      if (IA->hasSideEffects())
        Out << "sideeffect ";
      if (IA->isAlignStack())
        Out << "alignstack ";
      Out << '"';
      PrintEscapedString(IA->getAsmString(), Out);
      Out << "\", \"";
      PrintEscapedString(IA->getConstraintString(), Out);
      Out << '"';
      return;
    }
  
    if (const MDNode *N = dyn_cast<MDNode>(V)) {
      Out << '!' << Machine->getMetadataSlot(N);
      return;
    }
  
    if (const MDString *MDS = dyn_cast<MDString>(V)) {
      Out << "!\"";
      PrintEscapedString(MDS->getString(), Out);
      Out << '"';
      return;
    }
  
    if (V->getValueID() == Value::PseudoSourceValueVal ||
        V->getValueID() == Value::FixedStackPseudoSourceValueVal) {
      V->print(Out);
      return;
    }
  
    char Prefix = '%';
    int Slot;
    if (Machine) {
      if (const GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
        Slot = Machine->getGlobalSlot(GV);
        Prefix = '@';
      } else {
        Slot = Machine->getLocalSlot(V);
      }
    } else {
      Machine = createSlotTracker(V);
      if (Machine) {
        if (const GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
          Slot = Machine->getGlobalSlot(GV);
          Prefix = '@';
        } else {
          Slot = Machine->getLocalSlot(V);
        }
        delete Machine;
      } else {
        Slot = -1;
      }
    }
  
    if (Slot != -1)
      Out << Prefix << Slot;
    else
      Out << "<badref>";
  }
  
  void llvm::WriteAsOperand(raw_ostream &Out, const Value *V,
                            bool PrintType, const Module *Context) {
  
    // Fast path: Don't construct and populate a TypePrinting object if we
    // won't be needing any types printed.
    if (!PrintType &&
        (!isa<Constant>(V) || V->hasName() || isa<GlobalValue>(V))) {
      WriteAsOperandInternal(Out, V, 0, 0);
      return;
    }
  
    if (Context == 0) Context = getModuleFromVal(V);
  
    TypePrinting TypePrinter;
    std::vector<const Type*> NumberedTypes;
    AddModuleTypesToPrinter(TypePrinter, NumberedTypes, Context);
    if (PrintType) {
      TypePrinter.print(V->getType(), Out);
      Out << ' ';
    }
  
    WriteAsOperandInternal(Out, V, &TypePrinter, 0);
  }
  
  namespace {
  
  class AssemblyWriter {
    formatted_raw_ostream &Out;
    SlotTracker &Machine;
    const Module *TheModule;
    TypePrinting TypePrinter;
    AssemblyAnnotationWriter *AnnotationWriter;
    std::vector<const Type*> NumberedTypes;
    DenseMap<unsigned, StringRef> MDNames;
  
  public:
    inline AssemblyWriter(formatted_raw_ostream &o, SlotTracker &Mac,
                          const Module *M,
                          AssemblyAnnotationWriter *AAW)
      : Out(o), Machine(Mac), TheModule(M), AnnotationWriter(AAW) {
      AddModuleTypesToPrinter(TypePrinter, NumberedTypes, M);
      // FIXME: Provide MDPrinter
      if (M) {
        MetadataContext &TheMetadata = M->getContext().getMetadata();
        SmallVector<std::pair<unsigned, StringRef>, 4> Names;
        TheMetadata.getHandlerNames(Names);
        for (SmallVector<std::pair<unsigned, StringRef>, 4>::iterator 
               I = Names.begin(),
               E = Names.end(); I != E; ++I) {
        MDNames[I->first] = I->second;
        }
      }
    }
  
    void write(const Module *M) { printModule(M); }
  
    void write(const GlobalValue *G) {
      if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(G))
        printGlobal(GV);
      else if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(G))
        printAlias(GA);
      else if (const Function *F = dyn_cast<Function>(G))
        printFunction(F);
      else
        llvm_unreachable("Unknown global");
    }
  
    void write(const BasicBlock *BB)    { printBasicBlock(BB);  }
    void write(const Instruction *I)    { printInstruction(*I); }
  
    void writeOperand(const Value *Op, bool PrintType);
    void writeParamOperand(const Value *Operand, Attributes Attrs);
  
  private:
    void printModule(const Module *M);
    void printTypeSymbolTable(const TypeSymbolTable &ST);
    void printGlobal(const GlobalVariable *GV);
    void printAlias(const GlobalAlias *GV);
    void printFunction(const Function *F);
    void printArgument(const Argument *FA, Attributes Attrs);
    void printBasicBlock(const BasicBlock *BB);
    void printInstruction(const Instruction &I);
  
    // printInfoComment - Print a little comment after the instruction indicating
    // which slot it occupies.
    void printInfoComment(const Value &V);
  };
  }  // end of anonymous namespace
  
  
  void AssemblyWriter::writeOperand(const Value *Operand, bool PrintType) {
    if (Operand == 0) {
      Out << "<null operand!>";
    } else {
      if (PrintType) {
        TypePrinter.print(Operand->getType(), Out);
        Out << ' ';
      }
      WriteAsOperandInternal(Out, Operand, &TypePrinter, &Machine);
    }
  }
  
  void AssemblyWriter::writeParamOperand(const Value *Operand,
                                         Attributes Attrs) {
    if (Operand == 0) {
      Out << "<null operand!>";
    } else {
      // Print the type
      TypePrinter.print(Operand->getType(), Out);
      // Print parameter attributes list
      if (Attrs != Attribute::None)
        Out << ' ' << Attribute::getAsString(Attrs);
      Out << ' ';
      // Print the operand
      WriteAsOperandInternal(Out, Operand, &TypePrinter, &Machine);
    }
  }
  
  void AssemblyWriter::printModule(const Module *M) {
    if (!M->getModuleIdentifier().empty() &&
        // Don't print the ID if it will start a new line (which would
        // require a comment char before it).
        M->getModuleIdentifier().find('\n') == std::string::npos)
      Out << "; ModuleID = '" << M->getModuleIdentifier() << "'\n";
  
    if (!M->getDataLayout().empty())
      Out << "target datalayout = \"" << M->getDataLayout() << "\"\n";
    if (!M->getTargetTriple().empty())
      Out << "target triple = \"" << M->getTargetTriple() << "\"\n";
  
    if (!M->getModuleInlineAsm().empty()) {
      // Split the string into lines, to make it easier to read the .ll file.
      std::string Asm = M->getModuleInlineAsm();
      size_t CurPos = 0;
      size_t NewLine = Asm.find_first_of('\n', CurPos);
      Out << '\n';
      while (NewLine != std::string::npos) {
        // We found a newline, print the portion of the asm string from the
        // last newline up to this newline.
        Out << "module asm \"";
        PrintEscapedString(std::string(Asm.begin()+CurPos, Asm.begin()+NewLine),
                           Out);
        Out << "\"\n";
        CurPos = NewLine+1;
        NewLine = Asm.find_first_of('\n', CurPos);
      }
      Out << "module asm \"";
      PrintEscapedString(std::string(Asm.begin()+CurPos, Asm.end()), Out);
      Out << "\"\n";
    }
  
    // Loop over the dependent libraries and emit them.
    Module::lib_iterator LI = M->lib_begin();
    Module::lib_iterator LE = M->lib_end();
    if (LI != LE) {
      Out << '\n';
      Out << "deplibs = [ ";
      while (LI != LE) {
        Out << '"' << *LI << '"';
        ++LI;
        if (LI != LE)
          Out << ", ";
      }
      Out << " ]";
    }
  
    // Loop over the symbol table, emitting all id'd types.
    if (!M->getTypeSymbolTable().empty() || !NumberedTypes.empty()) Out << '\n';
    printTypeSymbolTable(M->getTypeSymbolTable());
  
    // Output all globals.
    if (!M->global_empty()) Out << '\n';
    for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
         I != E; ++I)
      printGlobal(I);
  
    // Output all aliases.
    if (!M->alias_empty()) Out << "\n";
    for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
         I != E; ++I)
      printAlias(I);
  
    // Output all of the functions.
    for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
      printFunction(I);
  
    // Output named metadata.
    if (!M->named_metadata_empty()) Out << '\n';
    for (Module::const_named_metadata_iterator I = M->named_metadata_begin(),
           E = M->named_metadata_end(); I != E; ++I) {
      const NamedMDNode *NMD = I;
      Out << "!" << NMD->getName() << " = !{";
      for (unsigned i = 0, e = NMD->getNumElements(); i != e; ++i) {
        if (i) Out << ", ";
        MDNode *MD = dyn_cast_or_null<MDNode>(NMD->getElement(i));
        Out << '!' << Machine.getMetadataSlot(MD);
      }
      Out << "}\n";
    }
  
    // Output metadata.
    if (!Machine.mdnEmpty()) Out << '\n';
    WriteMDNodes(Out, TypePrinter, Machine);
  }
  
  static void PrintLinkage(GlobalValue::LinkageTypes LT,
                           formatted_raw_ostream &Out) {
    switch (LT) {
    case GlobalValue::ExternalLinkage: break;
    case GlobalValue::PrivateLinkage:       Out << "private ";        break;
    case GlobalValue::LinkerPrivateLinkage: Out << "linker_private "; break;
    case GlobalValue::InternalLinkage:      Out << "internal ";       break;
    case GlobalValue::LinkOnceAnyLinkage:   Out << "linkonce ";       break;
    case GlobalValue::LinkOnceODRLinkage:   Out << "linkonce_odr ";   break;
    case GlobalValue::WeakAnyLinkage:       Out << "weak ";           break;
    case GlobalValue::WeakODRLinkage:       Out << "weak_odr ";       break;
    case GlobalValue::CommonLinkage:        Out << "common ";         break;
    case GlobalValue::AppendingLinkage:     Out << "appending ";      break;
    case GlobalValue::DLLImportLinkage:     Out << "dllimport ";      break;
    case GlobalValue::DLLExportLinkage:     Out << "dllexport ";      break;
    case GlobalValue::ExternalWeakLinkage:  Out << "extern_weak ";    break;
    case GlobalValue::AvailableExternallyLinkage:
      Out << "available_externally ";
      break;
      // This is invalid syntax and just a debugging aid.
    case GlobalValue::GhostLinkage:	  Out << "ghost ";	    break;
    }
  }
  
  
  static void PrintVisibility(GlobalValue::VisibilityTypes Vis,
                              formatted_raw_ostream &Out) {
    switch (Vis) {
    default: llvm_unreachable("Invalid visibility style!");
    case GlobalValue::DefaultVisibility: break;
    case GlobalValue::HiddenVisibility:    Out << "hidden "; break;
    case GlobalValue::ProtectedVisibility: Out << "protected "; break;
    }
  }
  
  void AssemblyWriter::printGlobal(const GlobalVariable *GV) {
    WriteAsOperandInternal(Out, GV, &TypePrinter, &Machine);
    Out << " = ";
  
    if (!GV->hasInitializer() && GV->hasExternalLinkage())
      Out << "external ";
  
    PrintLinkage(GV->getLinkage(), Out);
    PrintVisibility(GV->getVisibility(), Out);
  
    if (GV->isThreadLocal()) Out << "thread_local ";
    if (unsigned AddressSpace = GV->getType()->getAddressSpace())
      Out << "addrspace(" << AddressSpace << ") ";
    Out << (GV->isConstant() ? "constant " : "global ");
    TypePrinter.print(GV->getType()->getElementType(), Out);
  
    if (GV->hasInitializer()) {
      Out << ' ';
      writeOperand(GV->getInitializer(), false);
    }
  
    if (GV->hasSection())
      Out << ", section \"" << GV->getSection() << '"';
    if (GV->getAlignment())
      Out << ", align " << GV->getAlignment();
  
    printInfoComment(*GV);
    Out << '\n';
  }
  
  void AssemblyWriter::printAlias(const GlobalAlias *GA) {
    // Don't crash when dumping partially built GA
    if (!GA->hasName())
      Out << "<<nameless>> = ";
    else {
      PrintLLVMName(Out, GA);
      Out << " = ";
    }
    PrintVisibility(GA->getVisibility(), Out);
  
    Out << "alias ";
  
    PrintLinkage(GA->getLinkage(), Out);
  
    const Constant *Aliasee = GA->getAliasee();
  
    if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(Aliasee)) {
      TypePrinter.print(GV->getType(), Out);
      Out << ' ';
      PrintLLVMName(Out, GV);
    } else if (const Function *F = dyn_cast<Function>(Aliasee)) {
      TypePrinter.print(F->getFunctionType(), Out);
      Out << "* ";
  
      WriteAsOperandInternal(Out, F, &TypePrinter, &Machine);
    } else if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(Aliasee)) {
      TypePrinter.print(GA->getType(), Out);
      Out << ' ';
      PrintLLVMName(Out, GA);
    } else {
      const ConstantExpr *CE = cast<ConstantExpr>(Aliasee);
      // The only valid GEP is an all zero GEP.
      assert((CE->getOpcode() == Instruction::BitCast ||
              CE->getOpcode() == Instruction::GetElementPtr) &&
             "Unsupported aliasee");
      writeOperand(CE, false);
    }
  
    printInfoComment(*GA);
    Out << '\n';
  }
  
  void AssemblyWriter::printTypeSymbolTable(const TypeSymbolTable &ST) {
    // Emit all numbered types.
    for (unsigned i = 0, e = NumberedTypes.size(); i != e; ++i) {
      Out << '%' << i << " = type ";
  
      // Make sure we print out at least one level of the type structure, so
      // that we do not get %2 = type %2
      TypePrinter.printAtLeastOneLevel(NumberedTypes[i], Out);
      Out << '\n';
    }
  
    // Print the named types.
    for (TypeSymbolTable::const_iterator TI = ST.begin(), TE = ST.end();
         TI != TE; ++TI) {
      PrintLLVMName(Out, TI->first, LocalPrefix);
      Out << " = type ";
  
      // Make sure we print out at least one level of the type structure, so
      // that we do not get %FILE = type %FILE
      TypePrinter.printAtLeastOneLevel(TI->second, Out);
      Out << '\n';
    }
  }
  
  /// printFunction - Print all aspects of a function.
  ///
  void AssemblyWriter::printFunction(const Function *F) {
    // Print out the return type and name.
    Out << '\n';
  
    if (AnnotationWriter) AnnotationWriter->emitFunctionAnnot(F, Out);
  
    if (F->isDeclaration())
      Out << "declare ";
    else
      Out << "define ";
  
    PrintLinkage(F->getLinkage(), Out);
    PrintVisibility(F->getVisibility(), Out);
  
    // Print the calling convention.
    switch (F->getCallingConv()) {
    case CallingConv::C: break;   // default
    case CallingConv::Fast:         Out << "fastcc "; break;
    case CallingConv::Cold:         Out << "coldcc "; break;
    case CallingConv::X86_StdCall:  Out << "x86_stdcallcc "; break;
    case CallingConv::X86_FastCall: Out << "x86_fastcallcc "; break;
    case CallingConv::ARM_APCS:     Out << "arm_apcscc "; break;
    case CallingConv::ARM_AAPCS:    Out << "arm_aapcscc "; break;
    case CallingConv::ARM_AAPCS_VFP:Out << "arm_aapcs_vfpcc "; break;
    default: Out << "cc" << F->getCallingConv() << " "; break;
    }
  
    const FunctionType *FT = F->getFunctionType();
    const AttrListPtr &Attrs = F->getAttributes();
    Attributes RetAttrs = Attrs.getRetAttributes();
    if (RetAttrs != Attribute::None)
      Out <<  Attribute::getAsString(Attrs.getRetAttributes()) << ' ';
    TypePrinter.print(F->getReturnType(), Out);
    Out << ' ';
    WriteAsOperandInternal(Out, F, &TypePrinter, &Machine);
    Out << '(';
    Machine.incorporateFunction(F);
  
    // Loop over the arguments, printing them...
  
    unsigned Idx = 1;
    if (!F->isDeclaration()) {
      // If this isn't a declaration, print the argument names as well.
      for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
           I != E; ++I) {
        // Insert commas as we go... the first arg doesn't get a comma
        if (I != F->arg_begin()) Out << ", ";
        printArgument(I, Attrs.getParamAttributes(Idx));
        Idx++;
      }
    } else {
      // Otherwise, print the types from the function type.
      for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
        // Insert commas as we go... the first arg doesn't get a comma
        if (i) Out << ", ";
  
        // Output type...
        TypePrinter.print(FT->getParamType(i), Out);
  
        Attributes ArgAttrs = Attrs.getParamAttributes(i+1);
        if (ArgAttrs != Attribute::None)
          Out << ' ' << Attribute::getAsString(ArgAttrs);
      }
    }
  
    // Finish printing arguments...
    if (FT->isVarArg()) {
      if (FT->getNumParams()) Out << ", ";
      Out << "...";  // Output varargs portion of signature!
    }
    Out << ')';
    Attributes FnAttrs = Attrs.getFnAttributes();
    if (FnAttrs != Attribute::None)
      Out << ' ' << Attribute::getAsString(Attrs.getFnAttributes());
    if (F->hasSection())
      Out << " section \"" << F->getSection() << '"';
    if (F->getAlignment())
      Out << " align " << F->getAlignment();
    if (F->hasGC())
      Out << " gc \"" << F->getGC() << '"';
    if (F->isDeclaration()) {
      Out << "\n";
    } else {
      Out << " {";
  
      // Output all of its basic blocks... for the function
      for (Function::const_iterator I = F->begin(), E = F->end(); I != E; ++I)
        printBasicBlock(I);
  
      Out << "}\n";
    }
  
    Machine.purgeFunction();
  }
  
  /// printArgument - This member is called for every argument that is passed into
  /// the function.  Simply print it out
  ///
  void AssemblyWriter::printArgument(const Argument *Arg,
                                     Attributes Attrs) {
    // Output type...
    TypePrinter.print(Arg->getType(), Out);
  
    // Output parameter attributes list
    if (Attrs != Attribute::None)
      Out << ' ' << Attribute::getAsString(Attrs);
  
    // Output name, if available...
    if (Arg->hasName()) {
      Out << ' ';
      PrintLLVMName(Out, Arg);
    }
  }
  
  /// printBasicBlock - This member is called for each basic block in a method.
  ///
  void AssemblyWriter::printBasicBlock(const BasicBlock *BB) {
    if (BB->hasName()) {              // Print out the label if it exists...
      Out << "\n";
      PrintLLVMName(Out, BB->getName(), LabelPrefix);
      Out << ':';
    } else if (!BB->use_empty()) {      // Don't print block # of no uses...
      Out << "\n; <label>:";
      int Slot = Machine.getLocalSlot(BB);
      if (Slot != -1)
        Out << Slot;
      else
        Out << "<badref>";
    }
  
    if (BB->getParent() == 0) {
      Out.PadToColumn(50);
      Out << "; Error: Block without parent!";
    } else if (BB != &BB->getParent()->getEntryBlock()) {  // Not the entry block?
      // Output predecessors for the block...
      Out.PadToColumn(50);
      Out << ";";
      pred_const_iterator PI = pred_begin(BB), PE = pred_end(BB);
  
      if (PI == PE) {
        Out << " No predecessors!";
      } else {
        Out << " preds = ";
        writeOperand(*PI, false);
        for (++PI; PI != PE; ++PI) {
          Out << ", ";
          writeOperand(*PI, false);
        }
      }
    }
  
    Out << "\n";
  
    if (AnnotationWriter) AnnotationWriter->emitBasicBlockStartAnnot(BB, Out);
  
    // Output all of the instructions in the basic block...
    for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I != E; ++I) {
      printInstruction(*I);
      Out << '\n';
    }
  
    if (AnnotationWriter) AnnotationWriter->emitBasicBlockEndAnnot(BB, Out);
  }
  
  
  /// printInfoComment - Print a little comment after the instruction indicating
  /// which slot it occupies.
  ///
  void AssemblyWriter::printInfoComment(const Value &V) {
    if (V.getType() != Type::getVoidTy(V.getContext())) {
      Out.PadToColumn(50);
      Out << "; <";
      TypePrinter.print(V.getType(), Out);
      Out << "> [#uses=" << V.getNumUses() << ']';  // Output # uses
    }
  }
  
  // This member is called for each Instruction in a function..
  void AssemblyWriter::printInstruction(const Instruction &I) {
    if (AnnotationWriter) AnnotationWriter->emitInstructionAnnot(&I, Out);
  
    // Print out indentation for an instruction.
    Out << "  ";
  
    // Print out name if it exists...
    if (I.hasName()) {
      PrintLLVMName(Out, &I);
      Out << " = ";
    } else if (I.getType() != Type::getVoidTy(I.getContext())) {
      // Print out the def slot taken.
      int SlotNum = Machine.getLocalSlot(&I);
      if (SlotNum == -1)
        Out << "<badref> = ";
      else
        Out << '%' << SlotNum << " = ";
    }
  
    // If this is a volatile load or store, print out the volatile marker.
    if ((isa<LoadInst>(I)  && cast<LoadInst>(I).isVolatile()) ||
        (isa<StoreInst>(I) && cast<StoreInst>(I).isVolatile())) {
        Out << "volatile ";
    } else if (isa<CallInst>(I) && cast<CallInst>(I).isTailCall()) {
      // If this is a call, check if it's a tail call.
      Out << "tail ";
    }
  
    // Print out the opcode...
    Out << I.getOpcodeName();
  
    // Print out optimization information.
    WriteOptimizationInfo(Out, &I);
  
    // Print out the compare instruction predicates
    if (const CmpInst *CI = dyn_cast<CmpInst>(&I))
      Out << ' ' << getPredicateText(CI->getPredicate());
  
    // Print out the type of the operands...
    const Value *Operand = I.getNumOperands() ? I.getOperand(0) : 0;
  
    // Special case conditional branches to swizzle the condition out to the front
    if (isa<BranchInst>(I) && cast<BranchInst>(I).isConditional()) {
      BranchInst &BI(cast<BranchInst>(I));
      Out << ' ';
      writeOperand(BI.getCondition(), true);
      Out << ", ";
      writeOperand(BI.getSuccessor(0), true);
      Out << ", ";
      writeOperand(BI.getSuccessor(1), true);
  
    } else if (isa<SwitchInst>(I)) {
      // Special case switch instruction to get formatting nice and correct.
      Out << ' ';
      writeOperand(Operand        , true);
      Out << ", ";
      writeOperand(I.getOperand(1), true);
      Out << " [";
  
      for (unsigned op = 2, Eop = I.getNumOperands(); op < Eop; op += 2) {
        Out << "\n    ";
        writeOperand(I.getOperand(op  ), true);
        Out << ", ";
        writeOperand(I.getOperand(op+1), true);
      }
      Out << "\n  ]";
    } else if (isa<IndirectBrInst>(I)) {
      // Special case indirectbr instruction to get formatting nice and correct.
      Out << ' ';
      writeOperand(Operand, true);
      Out << ", [";
      
      for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i) {
        if (i != 1)
          Out << ", ";
        writeOperand(I.getOperand(i), true);
      }
      Out << ']';
    } else if (isa<PHINode>(I)) {
      Out << ' ';
      TypePrinter.print(I.getType(), Out);
      Out << ' ';
  
      for (unsigned op = 0, Eop = I.getNumOperands(); op < Eop; op += 2) {
        if (op) Out << ", ";
        Out << "[ ";
        writeOperand(I.getOperand(op  ), false); Out << ", ";
        writeOperand(I.getOperand(op+1), false); Out << " ]";
      }
    } else if (const ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(&I)) {
      Out << ' ';
      writeOperand(I.getOperand(0), true);
      for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i)
        Out << ", " << *i;
    } else if (const InsertValueInst *IVI = dyn_cast<InsertValueInst>(&I)) {
      Out << ' ';
      writeOperand(I.getOperand(0), true); Out << ", ";
      writeOperand(I.getOperand(1), true);
      for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i)
        Out << ", " << *i;
    } else if (isa<ReturnInst>(I) && !Operand) {
      Out << " void";
    } else if (const CallInst *CI = dyn_cast<CallInst>(&I)) {
      // Print the calling convention being used.
      switch (CI->getCallingConv()) {
      case CallingConv::C: break;   // default
      case CallingConv::Fast:  Out << " fastcc"; break;
      case CallingConv::Cold:  Out << " coldcc"; break;
      case CallingConv::X86_StdCall:  Out << " x86_stdcallcc"; break;
      case CallingConv::X86_FastCall: Out << " x86_fastcallcc"; break;
      case CallingConv::ARM_APCS:     Out << " arm_apcscc "; break;
      case CallingConv::ARM_AAPCS:    Out << " arm_aapcscc "; break;
      case CallingConv::ARM_AAPCS_VFP:Out << " arm_aapcs_vfpcc "; break;
      default: Out << " cc" << CI->getCallingConv(); break;
      }
  
      const PointerType    *PTy = cast<PointerType>(Operand->getType());
      const FunctionType   *FTy = cast<FunctionType>(PTy->getElementType());
      const Type         *RetTy = FTy->getReturnType();
      const AttrListPtr &PAL = CI->getAttributes();
  
      if (PAL.getRetAttributes() != Attribute::None)
        Out << ' ' << Attribute::getAsString(PAL.getRetAttributes());
  
      // If possible, print out the short form of the call instruction.  We can
      // only do this if the first argument is a pointer to a nonvararg function,
      // and if the return type is not a pointer to a function.
      //
      Out << ' ';
      if (!FTy->isVarArg() &&
          (!isa<PointerType>(RetTy) ||
           !isa<FunctionType>(cast<PointerType>(RetTy)->getElementType()))) {
        TypePrinter.print(RetTy, Out);
        Out << ' ';
        writeOperand(Operand, false);
      } else {
        writeOperand(Operand, true);
      }
      Out << '(';
      for (unsigned op = 1, Eop = I.getNumOperands(); op < Eop; ++op) {
        if (op > 1)
          Out << ", ";
        writeParamOperand(I.getOperand(op), PAL.getParamAttributes(op));
      }
      Out << ')';
      if (PAL.getFnAttributes() != Attribute::None)
        Out << ' ' << Attribute::getAsString(PAL.getFnAttributes());
    } else if (const InvokeInst *II = dyn_cast<InvokeInst>(&I)) {
      const PointerType    *PTy = cast<PointerType>(Operand->getType());
      const FunctionType   *FTy = cast<FunctionType>(PTy->getElementType());
      const Type         *RetTy = FTy->getReturnType();
      const AttrListPtr &PAL = II->getAttributes();
  
      // Print the calling convention being used.
      switch (II->getCallingConv()) {
      case CallingConv::C: break;   // default
      case CallingConv::Fast:  Out << " fastcc"; break;
      case CallingConv::Cold:  Out << " coldcc"; break;
      case CallingConv::X86_StdCall:  Out << " x86_stdcallcc"; break;
      case CallingConv::X86_FastCall: Out << " x86_fastcallcc"; break;
      case CallingConv::ARM_APCS:     Out << " arm_apcscc "; break;
      case CallingConv::ARM_AAPCS:    Out << " arm_aapcscc "; break;
      case CallingConv::ARM_AAPCS_VFP:Out << " arm_aapcs_vfpcc "; break;
      default: Out << " cc" << II->getCallingConv(); break;
      }
  
      if (PAL.getRetAttributes() != Attribute::None)
        Out << ' ' << Attribute::getAsString(PAL.getRetAttributes());
  
      // If possible, print out the short form of the invoke instruction. We can
      // only do this if the first argument is a pointer to a nonvararg function,
      // and if the return type is not a pointer to a function.
      //
      Out << ' ';
      if (!FTy->isVarArg() &&
          (!isa<PointerType>(RetTy) ||
           !isa<FunctionType>(cast<PointerType>(RetTy)->getElementType()))) {
        TypePrinter.print(RetTy, Out);
        Out << ' ';
        writeOperand(Operand, false);
      } else {
        writeOperand(Operand, true);
      }
      Out << '(';
      for (unsigned op = 3, Eop = I.getNumOperands(); op < Eop; ++op) {
        if (op > 3)
          Out << ", ";
        writeParamOperand(I.getOperand(op), PAL.getParamAttributes(op-2));
      }
  
      Out << ')';
      if (PAL.getFnAttributes() != Attribute::None)
        Out << ' ' << Attribute::getAsString(PAL.getFnAttributes());
  
      Out << "\n          to ";
      writeOperand(II->getNormalDest(), true);
      Out << " unwind ";
      writeOperand(II->getUnwindDest(), true);
  
    } else if (const AllocaInst *AI = dyn_cast<AllocaInst>(&I)) {
      Out << ' ';
      TypePrinter.print(AI->getType()->getElementType(), Out);
      if (!AI->getArraySize() || AI->isArrayAllocation()) {
        Out << ", ";
        writeOperand(AI->getArraySize(), true);
      }
      if (AI->getAlignment()) {
        Out << ", align " << AI->getAlignment();
      }
    } else if (isa<CastInst>(I)) {
      if (Operand) {
        Out << ' ';
        writeOperand(Operand, true);   // Work with broken code
      }
      Out << " to ";
      TypePrinter.print(I.getType(), Out);
    } else if (isa<VAArgInst>(I)) {
      if (Operand) {
        Out << ' ';
        writeOperand(Operand, true);   // Work with broken code
      }
      Out << ", ";
      TypePrinter.print(I.getType(), Out);
    } else if (Operand) {   // Print the normal way.
  
      // PrintAllTypes - Instructions who have operands of all the same type
      // omit the type from all but the first operand.  If the instruction has
      // different type operands (for example br), then they are all printed.
      bool PrintAllTypes = false;
      const Type *TheType = Operand->getType();
  
      // Select, Store and ShuffleVector always print all types.
      if (isa<SelectInst>(I) || isa<StoreInst>(I) || isa<ShuffleVectorInst>(I)
          || isa<ReturnInst>(I)) {
        PrintAllTypes = true;
      } else {
        for (unsigned i = 1, E = I.getNumOperands(); i != E; ++i) {
          Operand = I.getOperand(i);
          // note that Operand shouldn't be null, but the test helps make dump()
          // more tolerant of malformed IR
          if (Operand && Operand->getType() != TheType) {
            PrintAllTypes = true;    // We have differing types!  Print them all!
            break;
          }
        }
      }
  
      if (!PrintAllTypes) {
        Out << ' ';
        TypePrinter.print(TheType, Out);
      }
  
      Out << ' ';
      for (unsigned i = 0, E = I.getNumOperands(); i != E; ++i) {
        if (i) Out << ", ";
        writeOperand(I.getOperand(i), PrintAllTypes);
      }
    }
  
    // Print post operand alignment for load/store
    if (isa<LoadInst>(I) && cast<LoadInst>(I).getAlignment()) {
      Out << ", align " << cast<LoadInst>(I).getAlignment();
    } else if (isa<StoreInst>(I) && cast<StoreInst>(I).getAlignment()) {
      Out << ", align " << cast<StoreInst>(I).getAlignment();
    }
  
    // Print Metadata info
    if (!MDNames.empty()) {
      MetadataContext &TheMetadata = I.getContext().getMetadata();
      typedef SmallVector<std::pair<unsigned, TrackingVH<MDNode> >, 2> MDMapTy;
      MDMapTy MDs;
      TheMetadata.getMDs(&I, MDs);
      for (MDMapTy::const_iterator MI = MDs.begin(), ME = MDs.end(); MI != ME; 
           ++MI)
        Out << ", !" << MDNames[MI->first]
            << " !" << Machine.getMetadataSlot(MI->second);
    }
    printInfoComment(I);
  }
  
  
  //===----------------------------------------------------------------------===//
  //                       External Interface declarations
  //===----------------------------------------------------------------------===//
  
  void Module::print(raw_ostream &ROS, AssemblyAnnotationWriter *AAW) const {
    SlotTracker SlotTable(this);
    formatted_raw_ostream OS(ROS);
    AssemblyWriter W(OS, SlotTable, this, AAW);
    W.write(this);
  }
  
  void Type::print(raw_ostream &OS) const {
    if (this == 0) {
      OS << "<null Type>";
      return;
    }
    TypePrinting().print(this, OS);
  }
  
  void Value::print(raw_ostream &ROS, AssemblyAnnotationWriter *AAW) const {
    if (this == 0) {
      ROS << "printing a <null> value\n";
      return;
    }
    formatted_raw_ostream OS(ROS);
    if (const Instruction *I = dyn_cast<Instruction>(this)) {
      const Function *F = I->getParent() ? I->getParent()->getParent() : 0;
      SlotTracker SlotTable(F);
      AssemblyWriter W(OS, SlotTable, F ? F->getParent() : 0, AAW);
      W.write(I);
    } else if (const BasicBlock *BB = dyn_cast<BasicBlock>(this)) {
      SlotTracker SlotTable(BB->getParent());
      AssemblyWriter W(OS, SlotTable,
                       BB->getParent() ? BB->getParent()->getParent() : 0, AAW);
      W.write(BB);
    } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
      SlotTracker SlotTable(GV->getParent());
      AssemblyWriter W(OS, SlotTable, GV->getParent(), AAW);
      W.write(GV);
    } else if (const MDString *MDS = dyn_cast<MDString>(this)) {
      TypePrinting TypePrinter;
      TypePrinter.print(MDS->getType(), OS);
      OS << ' ';
      OS << "!\"";
      PrintEscapedString(MDS->getString(), OS);
      OS << '"';
    } else if (const MDNode *N = dyn_cast<MDNode>(this)) {
      SlotTracker SlotTable(N);
      TypePrinting TypePrinter;
      SlotTable.initialize();
      WriteMDNodes(OS, TypePrinter, SlotTable);
    } else if (const NamedMDNode *N = dyn_cast<NamedMDNode>(this)) {
      SlotTracker SlotTable(N);
      TypePrinting TypePrinter;
      SlotTable.initialize();
      OS << "!" << N->getName() << " = !{";
      for (unsigned i = 0, e = N->getNumElements(); i != e; ++i) {
        if (i) OS << ", ";
        MDNode *MD = dyn_cast_or_null<MDNode>(N->getElement(i));
        if (MD)
          OS << '!' << SlotTable.getMetadataSlot(MD);
        else
          OS << "null";
      }
      OS << "}\n";
      WriteMDNodes(OS, TypePrinter, SlotTable);
    } else if (const Constant *C = dyn_cast<Constant>(this)) {
      TypePrinting TypePrinter;
      TypePrinter.print(C->getType(), OS);
      OS << ' ';
      WriteConstantInt(OS, C, TypePrinter, 0);
    } else if (const Argument *A = dyn_cast<Argument>(this)) {
      WriteAsOperand(OS, this, true,
                     A->getParent() ? A->getParent()->getParent() : 0);
    } else if (isa<InlineAsm>(this)) {
      WriteAsOperand(OS, this, true, 0);
    } else {
      // Otherwise we don't know what it is. Call the virtual function to
      // allow a subclass to print itself.
      printCustom(OS);
    }
  }
  
  // Value::printCustom - subclasses should override this to implement printing.
  void Value::printCustom(raw_ostream &OS) const {
    llvm_unreachable("Unknown value to print out!");
  }
  
  // Value::dump - allow easy printing of Values from the debugger.
  void Value::dump() const { print(errs()); errs() << '\n'; }
  
  // Type::dump - allow easy printing of Types from the debugger.
  // This one uses type names from the given context module
  void Type::dump(const Module *Context) const {
    WriteTypeSymbolic(errs(), this, Context);
    errs() << '\n';
  }
  
  // Type::dump - allow easy printing of Types from the debugger.
  void Type::dump() const { dump(0); }
  
  // Module::dump() - Allow printing of Modules from the debugger.
  void Module::dump() const { print(errs(), 0); }
  