clang 8.0.0

PCHContainerOperations.cpp
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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 }
clang::ASTConsumer
ASTConsumer - This is an abstract interface that should be implemented by clients that read ASTs...
Definition: ASTConsumer.h:34
clang::ASTContext
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:155
ModuleLoader.h
ASTConsumer.h
clang::CompilerInstance
CompilerInstance - Helper class for managing a single instance of the Clang compiler.
Definition: CompilerInstance.h:73
clang::PCHContainerReader::~PCHContainerReader
virtual ~PCHContainerReader()=0
Definition: PCHContainerOperations.cpp:24
llvm::SmallVector< char, 0 >
clang
Dataflow Directional Tag Classes.
Definition: CFGReachabilityAnalysis.h:22
clang::PCHContainerOperations::PCHContainerOperations
PCHContainerOperations()
Automatically registers a RawPCHContainerWriter and RawPCHContainerReader.
Definition: PCHContainerOperations.cpp:66
PCHContainerOperations.h
clang::PCHContainerWriter::~PCHContainerWriter
virtual ~PCHContainerWriter()=0
Definition: PCHContainerOperations.cpp:23