clang/tools/clang-fuzzer/handle-cxx/handle_cxx.cpp

   1 //==-- handle_cxx.cpp - Helper function for Clang fuzzers ------------------==//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // Implements HandleCXX for use by the Clang fuzzers.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "handle_cxx.h"
  14
  15 #include "clang/CodeGen/CodeGenAction.h"
  16 #include "clang/Frontend/CompilerInstance.h"
  17 #include "clang/Lex/PreprocessorOptions.h"
  18 #include "clang/Tooling/Tooling.h"
  19 #include "llvm/Option/Option.h"
  20
  21 using namespace clang;
  22
  23 void clang_fuzzer::HandleCXX(const std::string &S,
  24                              const char *FileName,
  25                              const std::vector<const char *> &ExtraArgs) {
  26   llvm::opt::ArgStringList CC1Args;
  27   CC1Args.push_back("-cc1");
  28   for (auto &A : ExtraArgs)
  29     CC1Args.push_back(A);
  30   CC1Args.push_back(FileName);
  31
  32   llvm::IntrusiveRefCntPtr<FileManager> Files(
  33       new FileManager(FileSystemOptions()));
  34   IgnoringDiagConsumer Diags;
  35   IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
  36   DiagnosticsEngine Diagnostics(
  37       IntrusiveRefCntPtr<clang::DiagnosticIDs>(new DiagnosticIDs()), &*DiagOpts,
  38       &Diags, false);
  39   std::unique_ptr<clang::CompilerInvocation> Invocation(
  40       tooling::newInvocation(&Diagnostics, CC1Args, /*BinaryName=*/nullptr));
  41   std::unique_ptr<llvm::MemoryBuffer> Input =
  42       llvm::MemoryBuffer::getMemBuffer(S);
  43   Invocation->getPreprocessorOpts().addRemappedFile(FileName,
  44                                                     Input.release());
  45   std::unique_ptr<tooling::ToolAction> action(
  46       tooling::newFrontendActionFactory<clang::EmitObjAction>());
  47   std::shared_ptr<PCHContainerOperations> PCHContainerOps =
  48       std::make_shared<PCHContainerOperations>();
  49   action->runInvocation(std::move(Invocation), Files.get(), PCHContainerOps,
  50                         &Diags);
  51 }
  52