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//===--- ASTUnit.cpp - ASTUnit utility ------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// ASTUnit Implementation.
//
//===----------------------------------------------------------------------===//
#include "clang/Frontend/ASTUnit.h"
#include "clang/Frontend/PCHReader.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclVisitor.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Basic/TargetOptions.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Basic/Diagnostic.h"
#include "llvm/Support/Compiler.h"
#include "llvm/System/Path.h"
using namespace clang;
ASTUnit::ASTUnit(DiagnosticClient *diagClient) : tempFile(false) {
Diags.setClient(diagClient ? diagClient : new TextDiagnosticBuffer());
}
ASTUnit::~ASTUnit() {
if (tempFile)
llvm::sys::Path(getPCHFileName()).eraseFromDisk();
// The ASTUnit object owns the DiagnosticClient.
delete Diags.getClient();
}
namespace {
/// \brief Gathers information from PCHReader that will be used to initialize
/// a Preprocessor.
class VISIBILITY_HIDDEN PCHInfoCollector : public PCHReaderListener {
LangOptions &LangOpt;
HeaderSearch &HSI;
std::string &TargetTriple;
std::string &Predefines;
unsigned &Counter;
unsigned NumHeaderInfos;
public:
PCHInfoCollector(LangOptions &LangOpt, HeaderSearch &HSI,
std::string &TargetTriple, std::string &Predefines,
unsigned &Counter)
: LangOpt(LangOpt), HSI(HSI), TargetTriple(TargetTriple),
Predefines(Predefines), Counter(Counter), NumHeaderInfos(0) {}
virtual bool ReadLanguageOptions(const LangOptions &LangOpts) {
LangOpt = LangOpts;
return false;
}
virtual bool ReadTargetTriple(llvm::StringRef Triple) {
TargetTriple = Triple;
return false;
}
virtual bool ReadPredefinesBuffer(llvm::StringRef PCHPredef,
FileID PCHBufferID,
llvm::StringRef OriginalFileName,
std::string &SuggestedPredefines) {
Predefines = PCHPredef;
return false;
}
virtual void ReadHeaderFileInfo(const HeaderFileInfo &HFI) {
HSI.setHeaderFileInfoForUID(HFI, NumHeaderInfos++);
}
virtual void ReadCounter(unsigned Value) {
Counter = Value;
}
};
} // anonymous namespace
const std::string &ASTUnit::getOriginalSourceFileName() {
return dyn_cast<PCHReader>(Ctx->getExternalSource())->getOriginalSourceFile();
}
const std::string &ASTUnit::getPCHFileName() {
return dyn_cast<PCHReader>(Ctx->getExternalSource())->getFileName();
}
ASTUnit *ASTUnit::LoadFromPCHFile(const std::string &Filename,
std::string *ErrMsg,
DiagnosticClient *diagClient,
bool OnlyLocalDecls,
bool UseBumpAllocator) {
llvm::OwningPtr<ASTUnit> AST(new ASTUnit(diagClient));
AST->OnlyLocalDecls = OnlyLocalDecls;
AST->HeaderInfo.reset(new HeaderSearch(AST->getFileManager()));
// Gather Info for preprocessor construction later on.
LangOptions LangInfo;
HeaderSearch &HeaderInfo = *AST->HeaderInfo.get();
std::string TargetTriple;
std::string Predefines;
unsigned Counter;
llvm::OwningPtr<PCHReader> Reader;
llvm::OwningPtr<ExternalASTSource> Source;
Reader.reset(new PCHReader(AST->getSourceManager(), AST->getFileManager(),
AST->Diags));
Reader->setListener(new PCHInfoCollector(LangInfo, HeaderInfo, TargetTriple,
Predefines, Counter));
switch (Reader->ReadPCH(Filename)) {
case PCHReader::Success:
break;
case PCHReader::Failure:
case PCHReader::IgnorePCH:
if (ErrMsg)
*ErrMsg = "Could not load PCH file";
return NULL;
}
// PCH loaded successfully. Now create the preprocessor.
// Get information about the target being compiled for.
//
// FIXME: This is broken, we should store the TargetOptions in the PCH.
TargetOptions TargetOpts;
TargetOpts.ABI = "";
TargetOpts.CPU = "";
TargetOpts.Features.clear();
TargetOpts.Triple = TargetTriple;
AST->Target.reset(TargetInfo::CreateTargetInfo(AST->Diags, TargetOpts));
AST->PP.reset(new Preprocessor(AST->Diags, LangInfo, *AST->Target.get(),
AST->getSourceManager(), HeaderInfo));
Preprocessor &PP = *AST->PP.get();
PP.setPredefines(Reader->getSuggestedPredefines());
PP.setCounterValue(Counter);
Reader->setPreprocessor(PP);
// Create and initialize the ASTContext.
AST->Ctx.reset(new ASTContext(LangInfo,
AST->getSourceManager(),
*AST->Target.get(),
PP.getIdentifierTable(),
PP.getSelectorTable(),
PP.getBuiltinInfo(),
/* FreeMemory = */ !UseBumpAllocator,
/* size_reserve = */0));
ASTContext &Context = *AST->Ctx.get();
Reader->InitializeContext(Context);
// Attach the PCH reader to the AST context as an external AST
// source, so that declarations will be deserialized from the
// PCH file as needed.
Source.reset(Reader.take());
Context.setExternalSource(Source);
return AST.take();
}
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