forked from OSchip/llvm-project
84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
//===--- GeneratePCH.cpp - AST Consumer for PCH Generation ------*- 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 the CreatePCHGenerate function, which creates an
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// ASTConsume that generates a PCH file.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Frontend/ASTConsumers.h"
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#include "clang/Frontend/PCHWriter.h"
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#include "clang/Sema/SemaConsumer.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/ASTConsumer.h"
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Basic/FileManager.h"
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#include "llvm/Bitcode/BitstreamWriter.h"
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#include "llvm/System/Path.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/raw_ostream.h"
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#include <string>
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using namespace clang;
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using namespace llvm;
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namespace {
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class VISIBILITY_HIDDEN PCHGenerator : public SemaConsumer {
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const Preprocessor &PP;
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const char *isysroot;
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llvm::raw_ostream *Out;
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Sema *SemaPtr;
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MemorizeStatCalls *StatCalls; // owned by the FileManager
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public:
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explicit PCHGenerator(const Preprocessor &PP,
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const char *isysroot,
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llvm::raw_ostream *Out);
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virtual void InitializeSema(Sema &S) { SemaPtr = &S; }
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virtual void HandleTranslationUnit(ASTContext &Ctx);
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};
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}
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PCHGenerator::PCHGenerator(const Preprocessor &PP,
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const char *isysroot,
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llvm::raw_ostream *OS)
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: PP(PP), isysroot(isysroot), Out(OS), SemaPtr(0), StatCalls(0) {
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// Install a stat() listener to keep track of all of the stat()
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// calls.
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StatCalls = new MemorizeStatCalls;
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PP.getFileManager().addStatCache(StatCalls, /*AtBeginning=*/true);
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}
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void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) {
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if (PP.getDiagnostics().hasErrorOccurred())
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return;
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// Write the PCH contents into a buffer
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std::vector<unsigned char> Buffer;
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BitstreamWriter Stream(Buffer);
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PCHWriter Writer(Stream);
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// Emit the PCH file
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assert(SemaPtr && "No Sema?");
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Writer.WritePCH(*SemaPtr, StatCalls, isysroot);
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// Write the generated bitstream to "Out".
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Out->write((char *)&Buffer.front(), Buffer.size());
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// Make sure it hits disk now.
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Out->flush();
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}
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ASTConsumer *clang::CreatePCHGenerator(const Preprocessor &PP,
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llvm::raw_ostream *OS,
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const char *isysroot) {
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return new PCHGenerator(PP, isysroot, OS);
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}
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