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      1 //===--- GeneratePCH.cpp - Sema Consumer for PCH Generation -----*- 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 the PCHGenerator, which as a SemaConsumer that generates
     11 //  a PCH file.
     12 //
     13 //===----------------------------------------------------------------------===//
     14 
     15 #include "clang/Serialization/ASTWriter.h"
     16 #include "clang/Sema/SemaConsumer.h"
     17 #include "clang/AST/ASTContext.h"
     18 #include "clang/AST/ASTConsumer.h"
     19 #include "clang/Lex/Preprocessor.h"
     20 #include "clang/Basic/FileManager.h"
     21 #include "clang/Basic/FileSystemStatCache.h"
     22 #include "llvm/Bitcode/BitstreamWriter.h"
     23 #include "llvm/Support/raw_ostream.h"
     24 #include <string>
     25 
     26 using namespace clang;
     27 
     28 PCHGenerator::PCHGenerator(const Preprocessor &PP,
     29                            StringRef OutputFile,
     30                            clang::Module *Module,
     31                            StringRef isysroot,
     32                            raw_ostream *OS)
     33   : PP(PP), OutputFile(OutputFile), Module(Module),
     34     isysroot(isysroot.str()), Out(OS),
     35     SemaPtr(0), StatCalls(0), Stream(Buffer), Writer(Stream) {
     36   // Install a stat() listener to keep track of all of the stat()
     37   // calls.
     38   StatCalls = new MemorizeStatCalls();
     39   PP.getFileManager().addStatCache(StatCalls, /*AtBeginning=*/false);
     40 }
     41 
     42 PCHGenerator::~PCHGenerator() {
     43 }
     44 
     45 void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) {
     46   if (PP.getDiagnostics().hasErrorOccurred())
     47     return;
     48 
     49   // Emit the PCH file
     50   assert(SemaPtr && "No Sema?");
     51   Writer.WriteAST(*SemaPtr, StatCalls, OutputFile, Module, isysroot);
     52 
     53   // Write the generated bitstream to "Out".
     54   Out->write((char *)&Buffer.front(), Buffer.size());
     55 
     56   // Make sure it hits disk now.
     57   Out->flush();
     58 
     59   // Free up some memory, in case the process is kept alive.
     60   Buffer.clear();
     61 }
     62 
     63 ASTMutationListener *PCHGenerator::GetASTMutationListener() {
     64   return &Writer;
     65 }
     66 
     67 ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() {
     68   return &Writer;
     69 }
     70