clang 10.0.0git

PCHContainerOperations.cpp
Go to the documentation of this file.
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/Bitstream/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::CreatePCHContainerGenerator(
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 std::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(std::make_unique<RawPCHContainerWriter>());
67 registerReader(std::make_unique<RawPCHContainerReader>());
68 }
clang::ASTConsumer
ASTConsumer - This is an abstract interface that should be implemented by clients that read ASTs...
Definition: ASTConsumer.h:33
clang::ASTContext
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:168
ModuleLoader.h
ASTConsumer.h
clang::CompilerInstance
CompilerInstance - Helper class for managing a single instance of the Clang compiler.
Definition: CompilerInstance.h:72
clang::PCHContainerReader::~PCHContainerReader
virtual ~PCHContainerReader()=0
Definition: PCHContainerOperations.cpp:23
llvm::SmallVector< char, 0 >
clang
Dataflow Directional Tag Classes.
Definition: CFGReachabilityAnalysis.h:21
clang::PCHContainerOperations::PCHContainerOperations
PCHContainerOperations()
Automatically registers a RawPCHContainerWriter and RawPCHContainerReader.
Definition: PCHContainerOperations.cpp:65
PCHContainerOperations.h
clang::PCHContainerWriter::~PCHContainerWriter
virtual ~PCHContainerWriter()=0
Definition: PCHContainerOperations.cpp:22