lib/Frontend/PCHContainerOperations.cpp

   1 //===--- Frontend/PCHContainerOperations.cpp - PCH Containers ---*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 //  This file defines PCHContainerOperations and RawPCHContainerOperation.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "clang/Frontend/PCHContainerOperations.h"
  15 #include "clang/AST/ASTConsumer.h"
  16 #include "llvm/Bitcode/BitstreamReader.h"
  17 #include "llvm/Support/raw_ostream.h"
  18 #include "clang/Lex/ModuleLoader.h"
  19 using namespace clang;
  20
  21 namespace {
  22
  23 /// \brief A PCHContainerGenerator that writes out the PCH to a flat file.
  24 class PCHContainerGenerator : public ASTConsumer {
  25   std::shared_ptr<PCHBuffer> Buffer;
  26   raw_pwrite_stream *OS;
  27
  28 public:
  29   PCHContainerGenerator(DiagnosticsEngine &Diags,
  30                         const HeaderSearchOptions &HSO,
  31                         const PreprocessorOptions &PPO, const TargetOptions &TO,
  32                         const LangOptions &LO, const std::string &MainFileName,
  33                         const std::string &OutputFileName,
  34                         llvm::raw_pwrite_stream *OS,
  35                         std::shared_ptr<PCHBuffer> Buffer)
  36       : Buffer(Buffer), OS(OS) {}
  37
  38   virtual ~PCHContainerGenerator() {}
  39
  40   void HandleTranslationUnit(ASTContext &Ctx) override {
  41     if (Buffer->IsComplete) {
  42       // Make sure it hits disk now.
  43       *OS << Buffer->Data;
  44       OS->flush();
  45     }
  46     // Free the space of the temporary buffer.
  47     llvm::SmallVector<char, 0> Empty;
  48     Buffer->Data = std::move(Empty);
  49   }
  50 };
  51 }
  52
  53 std::unique_ptr<ASTConsumer>
  54 RawPCHContainerOperations::CreatePCHContainerGenerator(
  55     DiagnosticsEngine &Diags, const HeaderSearchOptions &HSO,
  56     const PreprocessorOptions &PPO, const TargetOptions &TO,
  57     const LangOptions &LO, const std::string &MainFileName,
  58     const std::string &OutputFileName, llvm::raw_pwrite_stream *OS,
  59     std::shared_ptr<PCHBuffer> Buffer) const {
  60   return llvm::make_unique<PCHContainerGenerator>(
  61       Diags, HSO, PPO, TO, LO, MainFileName, OutputFileName, OS, Buffer);
  62 }
  63
  64 void RawPCHContainerOperations::ExtractPCH(
  65     llvm::MemoryBufferRef Buffer, llvm::BitstreamReader &StreamFile) const {
  66   StreamFile.init((const unsigned char *)Buffer.getBufferStart(),
  67                   (const unsigned char *)Buffer.getBufferEnd());
  68 }