| 1 | //=== Serialization/PCHContainerOperations.cpp - PCH Containers -*- C++ -*-===// |
|---|---|
| 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 | // This file defines PCHContainerOperations and RawPCHContainerOperation. |
| 10 | // |
| 11 | //===----------------------------------------------------------------------===// |
| 12 | |
| 13 | #include "clang/Serialization/PCHContainerOperations.h" |
| 14 | #include "clang/AST/ASTConsumer.h" |
| 15 | #include "clang/Lex/ModuleLoader.h" |
| 16 | #include "llvm/Bitcode/BitstreamReader.h" |
| 17 | #include "llvm/Support/raw_ostream.h" |
| 18 | #include <utility> |
| 19 | |
| 20 | using namespace clang; |
| 21 | |
| 22 | PCHContainerWriter::~PCHContainerWriter() {} |
| 23 | PCHContainerReader::~PCHContainerReader() {} |
| 24 | |
| 25 | namespace { |
| 26 | |
| 27 | /// A PCHContainerGenerator that writes out the PCH to a flat file. |
| 28 | class RawPCHContainerGenerator : public ASTConsumer { |
| 29 | std::shared_ptr<PCHBuffer> Buffer; |
| 30 | std::unique_ptr<raw_pwrite_stream> OS; |
| 31 | |
| 32 | public: |
| 33 | RawPCHContainerGenerator(std::unique_ptr<llvm::raw_pwrite_stream> OS, |
| 34 | std::shared_ptr<PCHBuffer> Buffer) |
| 35 | : Buffer(std::move(Buffer)), OS(std::move(OS)) {} |
| 36 | |
| 37 | ~RawPCHContainerGenerator() override = default; |
| 38 | |
| 39 | void HandleTranslationUnit(ASTContext &Ctx) override { |
| 40 | if (Buffer->IsComplete) { |
| 41 | // Make sure it hits disk now. |
| 42 | *OS << Buffer->Data; |
| 43 | OS->flush(); |
| 44 | } |
| 45 | // Free the space of the temporary buffer. |
| 46 | llvm::SmallVector<char, 0> Empty; |
| 47 | Buffer->Data = std::move(Empty); |
| 48 | } |
| 49 | }; |
| 50 | |
| 51 | } // anonymous namespace |
| 52 | |
| 53 | std::unique_ptr<ASTConsumer> RawPCHContainerWriter::( |
| 54 | CompilerInstance &CI, const std::string &MainFileName, |
| 55 | const std::string &OutputFileName, std::unique_ptr<llvm::raw_pwrite_stream> OS, |
| 56 | std::shared_ptr<PCHBuffer> Buffer) const { |
| 57 | return llvm::make_unique<RawPCHContainerGenerator>(std::move(OS), Buffer); |
| 58 | } |
| 59 | |
| 60 | StringRef |
| 61 | RawPCHContainerReader::ExtractPCH(llvm::MemoryBufferRef Buffer) const { |
| 62 | return Buffer.getBuffer(); |
| 63 | } |
| 64 | |
| 65 | PCHContainerOperations::PCHContainerOperations() { |
| 66 | registerWriter(llvm::make_unique<RawPCHContainerWriter>()); |
| 67 | registerReader(llvm::make_unique<RawPCHContainerReader>()); |
| 68 | } |
| 69 |