text: //===--- DynamicStaticInitializersCheck.cpp - clang-tidy ------------------===//
  //
  // 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
  //
  //===----------------------------------------------------------------------===//
  
  #include "DynamicStaticInitializersCheck.h"
  #include "clang/AST/ASTContext.h"
  #include "clang/ASTMatchers/ASTMatchFinder.h"
  
  using namespace clang::ast_matchers;
  
  namespace clang {
  namespace tidy {
  namespace bugprone {
  
  AST_MATCHER(clang::VarDecl, hasConstantDeclaration) {
    const Expr *Init = Node.getInit();
    if (Init && !Init->isValueDependent()) {
      if (Node.isConstexpr())
        return true;
      return Node.checkInitIsICE();
    }
    return false;
  }
  
  DynamicStaticInitializersCheck::DynamicStaticInitializersCheck(StringRef Name,
                                                                 ClangTidyContext *Context)
      : ClangTidyCheck(Name, Context),
        RawStringHeaderFileExtensions(Options.getLocalOrGlobal(
          "HeaderFileExtensions", utils::defaultHeaderFileExtensions())) {
    if (!utils::parseFileExtensions(RawStringHeaderFileExtensions,
                                    HeaderFileExtensions,
                                    utils::defaultFileExtensionDelimiters())) {
      llvm::errs() << "Invalid header file extension: "
                   << RawStringHeaderFileExtensions << "\n";
    }
  }
  
  void DynamicStaticInitializersCheck::storeOptions(
      ClangTidyOptions::OptionMap &Opts) {
    Options.store(Opts, "HeaderFileExtensions", RawStringHeaderFileExtensions);
  }
  
  void DynamicStaticInitializersCheck::registerMatchers(MatchFinder *Finder) {
    Finder->addMatcher(
        varDecl(hasGlobalStorage(), unless(hasConstantDeclaration())).bind("var"),
        this);
  }
  
  void DynamicStaticInitializersCheck::check(const MatchFinder::MatchResult &Result) {
    const auto *Var = Result.Nodes.getNodeAs<VarDecl>("var");
    SourceLocation Loc = Var->getLocation();
    if (!Loc.isValid() || !utils::isPresumedLocInHeaderFile(Loc, *Result.SourceManager,
                                                            HeaderFileExtensions))
      return;
    // If the initializer is a constant expression, then the compiler
    // doesn't have to dynamically initialize it.
    diag(Loc, "static variable %0 may be dynamically initialized in this header file")
      << Var;
  }
  
  } // namespace bugprone
  } // namespace tidy
  } // namespace clang
  