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028eb5a3f8
As proposed on llvm-dev: http://lists.llvm.org/pipermail/llvm-dev/2016-October/106595.html This change also fixes an API oddity where BitstreamCursor::Read() would return zero for the first read past the end of the bitstream, but would report_fatal_error for subsequent reads. Now we always report_fatal_error for all reads past the end. Updated clients to check for the end of the bitstream before reading from it. I also needed to add padding to the invalid bitcode tests in test/Bitcode/. This is because the streaming interface was not checking that the file size is a multiple of 4. Differential Revision: https://reviews.llvm.org/D26219 llvm-svn: 285773
70 lines
2.3 KiB
C++
70 lines
2.3 KiB
C++
//===--- Frontend/PCHContainerOperations.cpp - PCH Containers ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines PCHContainerOperations and RawPCHContainerOperation.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Frontend/PCHContainerOperations.h"
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#include "clang/AST/ASTConsumer.h"
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#include "clang/Lex/ModuleLoader.h"
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#include "llvm/Bitcode/BitstreamReader.h"
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#include "llvm/Support/raw_ostream.h"
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#include <utility>
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using namespace clang;
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PCHContainerWriter::~PCHContainerWriter() {}
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PCHContainerReader::~PCHContainerReader() {}
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namespace {
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/// \brief A PCHContainerGenerator that writes out the PCH to a flat file.
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class RawPCHContainerGenerator : public ASTConsumer {
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std::shared_ptr<PCHBuffer> Buffer;
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std::unique_ptr<raw_pwrite_stream> OS;
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public:
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RawPCHContainerGenerator(std::unique_ptr<llvm::raw_pwrite_stream> OS,
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std::shared_ptr<PCHBuffer> Buffer)
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: Buffer(std::move(Buffer)), OS(std::move(OS)) {}
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~RawPCHContainerGenerator() override = default;
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void HandleTranslationUnit(ASTContext &Ctx) override {
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if (Buffer->IsComplete) {
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// Make sure it hits disk now.
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*OS << Buffer->Data;
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OS->flush();
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}
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// Free the space of the temporary buffer.
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llvm::SmallVector<char, 0> Empty;
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Buffer->Data = std::move(Empty);
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}
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};
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} // anonymous namespace
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std::unique_ptr<ASTConsumer> RawPCHContainerWriter::CreatePCHContainerGenerator(
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CompilerInstance &CI, const std::string &MainFileName,
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const std::string &OutputFileName, std::unique_ptr<llvm::raw_pwrite_stream> OS,
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std::shared_ptr<PCHBuffer> Buffer) const {
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return llvm::make_unique<RawPCHContainerGenerator>(std::move(OS), Buffer);
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}
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void RawPCHContainerReader::ExtractPCH(
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llvm::MemoryBufferRef Buffer, llvm::BitstreamReader &StreamFile) const {
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StreamFile = llvm::BitstreamReader(Buffer);
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}
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PCHContainerOperations::PCHContainerOperations() {
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registerWriter(llvm::make_unique<RawPCHContainerWriter>());
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registerReader(llvm::make_unique<RawPCHContainerReader>());
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}
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