contrib/llvm/tools/clang/lib/Serialization/PCHContainerOperations.cpp

   1 //=== Serialization/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/Serialization/PCHContainerOperations.h"
  15 #include "clang/AST/ASTConsumer.h"
  16 #include "clang/Lex/ModuleLoader.h"
  17 #include "llvm/Bitcode/BitstreamReader.h"
  18 #include "llvm/Support/raw_ostream.h"
  19 #include <utility>
  20
  21 using namespace clang;
  22
  23 PCHContainerWriter::~PCHContainerWriter() {}
  24 PCHContainerReader::~PCHContainerReader() {}
  25
  26 namespace {
  27
  28 /// A PCHContainerGenerator that writes out the PCH to a flat file.
  29 class RawPCHContainerGenerator : public ASTConsumer {
  30   std::shared_ptr<PCHBuffer> Buffer;
  31   std::unique_ptr<raw_pwrite_stream> OS;
  32
  33 public:
  34   RawPCHContainerGenerator(std::unique_ptr<llvm::raw_pwrite_stream> OS,
  35                            std::shared_ptr<PCHBuffer> Buffer)
  36       : Buffer(std::move(Buffer)), OS(std::move(OS)) {}
  37
  38   ~RawPCHContainerGenerator() override = default;
  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 } // anonymous namespace
  53
  54 std::unique_ptr<ASTConsumer> RawPCHContainerWriter::CreatePCHContainerGenerator(
  55     CompilerInstance &CI, const std::string &MainFileName,
  56     const std::string &OutputFileName, std::unique_ptr<llvm::raw_pwrite_stream> OS,
  57     std::shared_ptr<PCHBuffer> Buffer) const {
  58   return llvm::make_unique<RawPCHContainerGenerator>(std::move(OS), Buffer);
  59 }
  60
  61 StringRef
  62 RawPCHContainerReader::ExtractPCH(llvm::MemoryBufferRef Buffer) const {
  63   return Buffer.getBuffer();
  64 }
  65
  66 PCHContainerOperations::PCHContainerOperations() {
  67   registerWriter(llvm::make_unique<RawPCHContainerWriter>());
  68   registerReader(llvm::make_unique<RawPCHContainerReader>());
  69 }