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 "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
~PCHContainerWriter()23 PCHContainerWriter::~PCHContainerWriter() {}
~PCHContainerReader()24 PCHContainerReader::~PCHContainerReader() {}
25
26 namespace {
27
28 /// \brief A PCHContainerGenerator that writes out the PCH to a flat file.
29 class RawPCHContainerGenerator : public ASTConsumer {
30 std::shared_ptr<PCHBuffer> Buffer;
31 raw_pwrite_stream *OS;
32
33 public:
RawPCHContainerGenerator(llvm::raw_pwrite_stream * OS,std::shared_ptr<PCHBuffer> Buffer)34 RawPCHContainerGenerator(llvm::raw_pwrite_stream *OS,
35 std::shared_ptr<PCHBuffer> Buffer)
36 : Buffer(std::move(Buffer)), OS(OS) {}
37
38 ~RawPCHContainerGenerator() override = default;
39
HandleTranslationUnit(ASTContext & Ctx)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
CreatePCHContainerGenerator(CompilerInstance & CI,const std::string & MainFileName,const std::string & OutputFileName,llvm::raw_pwrite_stream * OS,std::shared_ptr<PCHBuffer> Buffer) const54 std::unique_ptr<ASTConsumer> RawPCHContainerWriter::CreatePCHContainerGenerator(
55 CompilerInstance &CI, const std::string &MainFileName,
56 const std::string &OutputFileName, llvm::raw_pwrite_stream *OS,
57 std::shared_ptr<PCHBuffer> Buffer) const {
58 return llvm::make_unique<RawPCHContainerGenerator>(OS, Buffer);
59 }
60
ExtractPCH(llvm::MemoryBufferRef Buffer,llvm::BitstreamReader & StreamFile) const61 void RawPCHContainerReader::ExtractPCH(
62 llvm::MemoryBufferRef Buffer, llvm::BitstreamReader &StreamFile) const {
63 StreamFile.init((const unsigned char *)Buffer.getBufferStart(),
64 (const unsigned char *)Buffer.getBufferEnd());
65 }
66
PCHContainerOperations()67 PCHContainerOperations::PCHContainerOperations() {
68 registerWriter(llvm::make_unique<RawPCHContainerWriter>());
69 registerReader(llvm::make_unique<RawPCHContainerReader>());
70 }
71