contrib/llvm/tools/clang/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 RawPCHContainerGenerator : public ASTConsumer {
  25   std::shared_ptr<PCHBuffer> Buffer;
  26   raw_pwrite_stream *OS;
  27
  28 public:
  29   RawPCHContainerGenerator(DiagnosticsEngine &Diags,
  30                            const HeaderSearchOptions &HSO,
  31                            const PreprocessorOptions &PPO,
  32                            const TargetOptions &TO, const LangOptions &LO,
  33                            const std::string &MainFileName,
  34                            const std::string &OutputFileName,
  35                            llvm::raw_pwrite_stream *OS,
  36                            std::shared_ptr<PCHBuffer> Buffer)
  37       : Buffer(Buffer), OS(OS) {}
  38
  39   virtual ~RawPCHContainerGenerator() {}
  40
  41   void HandleTranslationUnit(ASTContext &Ctx) override {
  42     if (Buffer->IsComplete) {
  43       // Make sure it hits disk now.
  44       *OS << Buffer->Data;
  45       OS->flush();
  46     }
  47     // Free the space of the temporary buffer.
  48     llvm::SmallVector<char, 0> Empty;
  49     Buffer->Data = std::move(Empty);
  50   }
  51 };
  52 }
  53
  54 std::unique_ptr<ASTConsumer> RawPCHContainerWriter::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<RawPCHContainerGenerator>(
  61       Diags, HSO, PPO, TO, LO, MainFileName, OutputFileName, OS, Buffer);
  62 }
  63
  64 void RawPCHContainerReader::ExtractPCH(
  65     llvm::MemoryBufferRef Buffer, llvm::BitstreamReader &StreamFile) const {
  66   StreamFile.init((const unsigned char *)Buffer.getBufferStart(),
  67                   (const unsigned char *)Buffer.getBufferEnd());
  68 }
  69
  70 PCHContainerOperations::PCHContainerOperations() {
  71   registerWriter(llvm::make_unique<RawPCHContainerWriter>());
  72   registerReader(llvm::make_unique<RawPCHContainerReader>());
  73 }