Check in LLVM r95781.
diff --git a/lib/Frontend/ASTUnit.cpp b/lib/Frontend/ASTUnit.cpp
new file mode 100644
index 0000000..7f1e722
--- /dev/null
+++ b/lib/Frontend/ASTUnit.cpp
@@ -0,0 +1,372 @@
+//===--- 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/ASTConsumer.h"
+#include "clang/AST/DeclVisitor.h"
+#include "clang/AST/StmtVisitor.h"
+#include "clang/Driver/Compilation.h"
+#include "clang/Driver/Driver.h"
+#include "clang/Driver/Job.h"
+#include "clang/Driver/Tool.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Frontend/FrontendOptions.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/MemoryBuffer.h"
+#include "llvm/System/Host.h"
+#include "llvm/System/Path.h"
+using namespace clang;
+
+ASTUnit::ASTUnit(bool _MainFileIsAST)
+ : tempFile(false), MainFileIsAST(_MainFileIsAST) {
+}
+ASTUnit::~ASTUnit() {
+ if (tempFile)
+ llvm::sys::Path(getPCHFileName()).eraseFromDisk();
+}
+
+namespace {
+
+/// \brief Gathers information from PCHReader that will be used to initialize
+/// a Preprocessor.
+class 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 OriginalSourceFile;
+}
+
+const std::string &ASTUnit::getPCHFileName() {
+ assert(isMainFileAST() && "Not an ASTUnit from a PCH file!");
+ return static_cast<PCHReader *>(Ctx->getExternalSource())->getFileName();
+}
+
+ASTUnit *ASTUnit::LoadFromPCHFile(const std::string &Filename,
+ Diagnostic &Diags,
+ bool OnlyLocalDecls,
+ bool UseBumpAllocator,
+ RemappedFile *RemappedFiles,
+ unsigned NumRemappedFiles) {
+ llvm::OwningPtr<ASTUnit> AST(new ASTUnit(true));
+ AST->OnlyLocalDecls = OnlyLocalDecls;
+ AST->HeaderInfo.reset(new HeaderSearch(AST->getFileManager()));
+
+ for (unsigned I = 0; I != NumRemappedFiles; ++I) {
+ // Create the file entry for the file that we're mapping from.
+ const FileEntry *FromFile
+ = AST->getFileManager().getVirtualFile(RemappedFiles[I].first,
+ RemappedFiles[I].second->getBufferSize(),
+ 0);
+ if (!FromFile) {
+ Diags.Report(diag::err_fe_remap_missing_from_file)
+ << RemappedFiles[I].first;
+ continue;
+ }
+
+ // Override the contents of the "from" file with the contents of
+ // the "to" file.
+ AST->getSourceManager().overrideFileContents(FromFile,
+ RemappedFiles[I].second);
+ }
+
+ // 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(),
+ Diags));
+ Reader->setListener(new PCHInfoCollector(LangInfo, HeaderInfo, TargetTriple,
+ Predefines, Counter));
+
+ switch (Reader->ReadPCH(Filename)) {
+ case PCHReader::Success:
+ break;
+
+ case PCHReader::Failure:
+ case PCHReader::IgnorePCH:
+ Diags.Report(diag::err_fe_unable_to_load_pch);
+ return NULL;
+ }
+
+ AST->OriginalSourceFile = Reader->getOriginalSourceFile();
+
+ // 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(Diags, TargetOpts));
+ AST->PP.reset(new Preprocessor(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();
+}
+
+namespace {
+
+class TopLevelDeclTrackerConsumer : public ASTConsumer {
+ ASTUnit &Unit;
+
+public:
+ TopLevelDeclTrackerConsumer(ASTUnit &_Unit) : Unit(_Unit) {}
+
+ void HandleTopLevelDecl(DeclGroupRef D) {
+ for (DeclGroupRef::iterator it = D.begin(), ie = D.end(); it != ie; ++it)
+ Unit.getTopLevelDecls().push_back(*it);
+ }
+};
+
+class TopLevelDeclTrackerAction : public ASTFrontendAction {
+public:
+ ASTUnit &Unit;
+
+ virtual ASTConsumer *CreateASTConsumer(CompilerInstance &CI,
+ llvm::StringRef InFile) {
+ return new TopLevelDeclTrackerConsumer(Unit);
+ }
+
+public:
+ TopLevelDeclTrackerAction(ASTUnit &_Unit) : Unit(_Unit) {}
+
+ virtual bool hasCodeCompletionSupport() const { return false; }
+};
+
+}
+
+ASTUnit *ASTUnit::LoadFromCompilerInvocation(const CompilerInvocation &CI,
+ Diagnostic &Diags,
+ bool OnlyLocalDecls) {
+ // Create the compiler instance to use for building the AST.
+ CompilerInstance Clang;
+ llvm::OwningPtr<ASTUnit> AST;
+ llvm::OwningPtr<TopLevelDeclTrackerAction> Act;
+
+ Clang.setInvocation(const_cast<CompilerInvocation*>(&CI));
+
+ Clang.setDiagnostics(&Diags);
+ Clang.setDiagnosticClient(Diags.getClient());
+
+ // Create the target instance.
+ Clang.setTarget(TargetInfo::CreateTargetInfo(Clang.getDiagnostics(),
+ Clang.getTargetOpts()));
+ if (!Clang.hasTarget())
+ goto error;
+
+ // Inform the target of the language options.
+ //
+ // FIXME: We shouldn't need to do this, the target should be immutable once
+ // created. This complexity should be lifted elsewhere.
+ Clang.getTarget().setForcedLangOptions(Clang.getLangOpts());
+
+ assert(Clang.getFrontendOpts().Inputs.size() == 1 &&
+ "Invocation must have exactly one source file!");
+ assert(Clang.getFrontendOpts().Inputs[0].first != FrontendOptions::IK_AST &&
+ "FIXME: AST inputs not yet supported here!");
+
+ // Create the AST unit.
+ AST.reset(new ASTUnit(false));
+
+ AST->OnlyLocalDecls = OnlyLocalDecls;
+ AST->OriginalSourceFile = Clang.getFrontendOpts().Inputs[0].second;
+
+ // Create a file manager object to provide access to and cache the filesystem.
+ Clang.setFileManager(&AST->getFileManager());
+
+ // Create the source manager.
+ Clang.setSourceManager(&AST->getSourceManager());
+
+ // Create the preprocessor.
+ Clang.createPreprocessor();
+
+ Act.reset(new TopLevelDeclTrackerAction(*AST));
+ if (!Act->BeginSourceFile(Clang, Clang.getFrontendOpts().Inputs[0].second,
+ /*IsAST=*/false))
+ goto error;
+
+ Act->Execute();
+
+ // Steal the created target, context, and preprocessor, and take back the
+ // source and file managers.
+ AST->Ctx.reset(Clang.takeASTContext());
+ AST->PP.reset(Clang.takePreprocessor());
+ Clang.takeSourceManager();
+ Clang.takeFileManager();
+ AST->Target.reset(Clang.takeTarget());
+
+ Act->EndSourceFile();
+
+ Clang.takeDiagnosticClient();
+ Clang.takeDiagnostics();
+ Clang.takeInvocation();
+
+ return AST.take();
+
+error:
+ Clang.takeSourceManager();
+ Clang.takeFileManager();
+ Clang.takeDiagnosticClient();
+ Clang.takeDiagnostics();
+ return 0;
+}
+
+ASTUnit *ASTUnit::LoadFromCommandLine(const char **ArgBegin,
+ const char **ArgEnd,
+ Diagnostic &Diags,
+ llvm::StringRef ResourceFilesPath,
+ bool OnlyLocalDecls,
+ bool UseBumpAllocator,
+ RemappedFile *RemappedFiles,
+ unsigned NumRemappedFiles) {
+ llvm::SmallVector<const char *, 16> Args;
+ Args.push_back("<clang>"); // FIXME: Remove dummy argument.
+ Args.insert(Args.end(), ArgBegin, ArgEnd);
+
+ // FIXME: Find a cleaner way to force the driver into restricted modes. We
+ // also want to force it to use clang.
+ Args.push_back("-fsyntax-only");
+
+ // FIXME: We shouldn't have to pass in the path info.
+ driver::Driver TheDriver("clang", "/", llvm::sys::getHostTriple(),
+ "a.out", false, Diags);
+
+ // Don't check that inputs exist, they have been remapped.
+ TheDriver.setCheckInputsExist(false);
+
+ llvm::OwningPtr<driver::Compilation> C(
+ TheDriver.BuildCompilation(Args.size(), Args.data()));
+
+ // We expect to get back exactly one command job, if we didn't something
+ // failed.
+ const driver::JobList &Jobs = C->getJobs();
+ if (Jobs.size() != 1 || !isa<driver::Command>(Jobs.begin())) {
+ llvm::SmallString<256> Msg;
+ llvm::raw_svector_ostream OS(Msg);
+ C->PrintJob(OS, C->getJobs(), "; ", true);
+ Diags.Report(diag::err_fe_expected_compiler_job) << OS.str();
+ return 0;
+ }
+
+ const driver::Command *Cmd = cast<driver::Command>(*Jobs.begin());
+ if (llvm::StringRef(Cmd->getCreator().getName()) != "clang") {
+ Diags.Report(diag::err_fe_expected_clang_command);
+ return 0;
+ }
+
+ const driver::ArgStringList &CCArgs = Cmd->getArguments();
+ llvm::OwningPtr<CompilerInvocation> CI(new CompilerInvocation);
+ CompilerInvocation::CreateFromArgs(*CI, (const char**) CCArgs.data(),
+ (const char**) CCArgs.data()+CCArgs.size(),
+ Diags);
+
+ // Override any files that need remapping
+ for (unsigned I = 0; I != NumRemappedFiles; ++I)
+ CI->getPreprocessorOpts().addRemappedFile(RemappedFiles[I].first,
+ RemappedFiles[I].second);
+
+ // Override the resources path.
+ CI->getHeaderSearchOpts().ResourceDir = ResourceFilesPath;
+
+ CI->getFrontendOpts().DisableFree = UseBumpAllocator;
+ ASTUnit *Unit = LoadFromCompilerInvocation(*CI, Diags, OnlyLocalDecls);
+ if (Unit)
+ Unit->Invocation.reset(CI.take());
+
+ return Unit;
+}