Update aosp/master clang for rebase to r256229
http://b/26987366
Change-Id: I5d349c9843ea5c24d6e455956f8a446393b6873d
diff --git a/lib/CodeGen/ObjectFilePCHContainerOperations.cpp b/lib/CodeGen/ObjectFilePCHContainerOperations.cpp
new file mode 100644
index 0000000..b397eb3
--- /dev/null
+++ b/lib/CodeGen/ObjectFilePCHContainerOperations.cpp
@@ -0,0 +1,300 @@
+//===--- ObjectFilePCHContainerOperations.cpp -----------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/CodeGen/ObjectFilePCHContainerOperations.h"
+#include "CGDebugInfo.h"
+#include "CodeGenModule.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/DeclObjC.h"
+#include "clang/AST/Expr.h"
+#include "clang/AST/RecursiveASTVisitor.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/CodeGen/BackendUtil.h"
+#include "clang/Frontend/CodeGenOptions.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Lex/HeaderSearch.h"
+#include "clang/Serialization/ASTWriter.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Bitcode/BitstreamReader.h"
+#include "llvm/DebugInfo/DWARF/DWARFContext.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Object/COFF.h"
+#include "llvm/Object/ObjectFile.h"
+#include "llvm/Support/TargetRegistry.h"
+#include <memory>
+
+using namespace clang;
+
+#define DEBUG_TYPE "pchcontainer"
+
+namespace {
+class PCHContainerGenerator : public ASTConsumer {
+ DiagnosticsEngine &Diags;
+ const std::string MainFileName;
+ ASTContext *Ctx;
+ ModuleMap &MMap;
+ const HeaderSearchOptions &HeaderSearchOpts;
+ const PreprocessorOptions &PreprocessorOpts;
+ CodeGenOptions CodeGenOpts;
+ const TargetOptions TargetOpts;
+ const LangOptions LangOpts;
+ std::unique_ptr<llvm::LLVMContext> VMContext;
+ std::unique_ptr<llvm::Module> M;
+ std::unique_ptr<CodeGen::CodeGenModule> Builder;
+ raw_pwrite_stream *OS;
+ std::shared_ptr<PCHBuffer> Buffer;
+
+ /// Visit every type and emit debug info for it.
+ struct DebugTypeVisitor : public RecursiveASTVisitor<DebugTypeVisitor> {
+ clang::CodeGen::CGDebugInfo &DI;
+ ASTContext &Ctx;
+ DebugTypeVisitor(clang::CodeGen::CGDebugInfo &DI, ASTContext &Ctx)
+ : DI(DI), Ctx(Ctx) {}
+
+ /// Determine whether this type can be represented in DWARF.
+ static bool CanRepresent(const Type *Ty) {
+ return !Ty->isDependentType() && !Ty->isUndeducedType();
+ }
+
+ bool VisitImportDecl(ImportDecl *D) {
+ auto *Import = cast<ImportDecl>(D);
+ if (!Import->getImportedOwningModule())
+ DI.EmitImportDecl(*Import);
+ return true;
+ }
+
+ bool VisitTypeDecl(TypeDecl *D) {
+ QualType QualTy = Ctx.getTypeDeclType(D);
+ if (!QualTy.isNull() && CanRepresent(QualTy.getTypePtr()))
+ DI.getOrCreateStandaloneType(QualTy, D->getLocation());
+ return true;
+ }
+
+ bool VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
+ QualType QualTy(D->getTypeForDecl(), 0);
+ if (!QualTy.isNull() && CanRepresent(QualTy.getTypePtr()))
+ DI.getOrCreateStandaloneType(QualTy, D->getLocation());
+ return true;
+ }
+
+ bool VisitFunctionDecl(FunctionDecl *D) {
+ if (isa<CXXMethodDecl>(D))
+ // This is not yet supported. Constructing the `this' argument
+ // mandates a CodeGenFunction.
+ return true;
+
+ SmallVector<QualType, 16> ArgTypes;
+ for (auto i : D->params())
+ ArgTypes.push_back(i->getType());
+ QualType RetTy = D->getReturnType();
+ QualType FnTy = Ctx.getFunctionType(RetTy, ArgTypes,
+ FunctionProtoType::ExtProtoInfo());
+ if (CanRepresent(FnTy.getTypePtr()))
+ DI.EmitFunctionDecl(D, D->getLocation(), FnTy);
+ return true;
+ }
+
+ bool VisitObjCMethodDecl(ObjCMethodDecl *D) {
+ if (!D->getClassInterface())
+ return true;
+
+ bool selfIsPseudoStrong, selfIsConsumed;
+ SmallVector<QualType, 16> ArgTypes;
+ ArgTypes.push_back(D->getSelfType(Ctx, D->getClassInterface(),
+ selfIsPseudoStrong, selfIsConsumed));
+ ArgTypes.push_back(Ctx.getObjCSelType());
+ for (auto i : D->params())
+ ArgTypes.push_back(i->getType());
+ QualType RetTy = D->getReturnType();
+ QualType FnTy = Ctx.getFunctionType(RetTy, ArgTypes,
+ FunctionProtoType::ExtProtoInfo());
+ if (CanRepresent(FnTy.getTypePtr()))
+ DI.EmitFunctionDecl(D, D->getLocation(), FnTy);
+ return true;
+ }
+ };
+
+public:
+ PCHContainerGenerator(CompilerInstance &CI, const std::string &MainFileName,
+ const std::string &OutputFileName,
+ raw_pwrite_stream *OS,
+ std::shared_ptr<PCHBuffer> Buffer)
+ : Diags(CI.getDiagnostics()), Ctx(nullptr),
+ MMap(CI.getPreprocessor().getHeaderSearchInfo().getModuleMap()),
+ HeaderSearchOpts(CI.getHeaderSearchOpts()),
+ PreprocessorOpts(CI.getPreprocessorOpts()),
+ TargetOpts(CI.getTargetOpts()), LangOpts(CI.getLangOpts()), OS(OS),
+ Buffer(Buffer) {
+ // The debug info output isn't affected by CodeModel and
+ // ThreadModel, but the backend expects them to be nonempty.
+ CodeGenOpts.CodeModel = "default";
+ CodeGenOpts.ThreadModel = "single";
+ CodeGenOpts.DebugTypeExtRefs = true;
+ CodeGenOpts.setDebugInfo(CodeGenOptions::FullDebugInfo);
+ }
+
+ ~PCHContainerGenerator() override = default;
+
+ void Initialize(ASTContext &Context) override {
+ assert(!Ctx && "initialized multiple times");
+
+ Ctx = &Context;
+ VMContext.reset(new llvm::LLVMContext());
+ M.reset(new llvm::Module(MainFileName, *VMContext));
+ M->setDataLayout(Ctx->getTargetInfo().getDataLayoutString());
+ Builder.reset(new CodeGen::CodeGenModule(
+ *Ctx, HeaderSearchOpts, PreprocessorOpts, CodeGenOpts, *M, Diags));
+ Builder->getModuleDebugInfo()->setModuleMap(MMap);
+ }
+
+ bool HandleTopLevelDecl(DeclGroupRef D) override {
+ if (Diags.hasErrorOccurred())
+ return true;
+
+ // Collect debug info for all decls in this group.
+ for (auto *I : D)
+ if (!I->isFromASTFile()) {
+ DebugTypeVisitor DTV(*Builder->getModuleDebugInfo(), *Ctx);
+ DTV.TraverseDecl(I);
+ }
+ return true;
+ }
+
+ void HandleTopLevelDeclInObjCContainer(DeclGroupRef D) override {
+ HandleTopLevelDecl(D);
+ }
+
+ void HandleTagDeclDefinition(TagDecl *D) override {
+ if (Diags.hasErrorOccurred())
+ return;
+
+ Builder->UpdateCompletedType(D);
+ }
+
+ void HandleTagDeclRequiredDefinition(const TagDecl *D) override {
+ if (Diags.hasErrorOccurred())
+ return;
+
+ if (const RecordDecl *RD = dyn_cast<RecordDecl>(D))
+ Builder->getModuleDebugInfo()->completeRequiredType(RD);
+ }
+
+ /// Emit a container holding the serialized AST.
+ void HandleTranslationUnit(ASTContext &Ctx) override {
+ assert(M && VMContext && Builder);
+ // Delete these on function exit.
+ std::unique_ptr<llvm::LLVMContext> VMContext = std::move(this->VMContext);
+ std::unique_ptr<llvm::Module> M = std::move(this->M);
+ std::unique_ptr<CodeGen::CodeGenModule> Builder = std::move(this->Builder);
+
+ if (Diags.hasErrorOccurred())
+ return;
+
+ M->setTargetTriple(Ctx.getTargetInfo().getTriple().getTriple());
+ M->setDataLayout(Ctx.getTargetInfo().getDataLayoutString());
+ Builder->getModuleDebugInfo()->setDwoId(Buffer->Signature);
+
+ // Finalize the Builder.
+ if (Builder)
+ Builder->Release();
+
+ // Ensure the target exists.
+ std::string Error;
+ auto Triple = Ctx.getTargetInfo().getTriple();
+ if (!llvm::TargetRegistry::lookupTarget(Triple.getTriple(), Error))
+ llvm::report_fatal_error(Error);
+
+ // Emit the serialized Clang AST into its own section.
+ assert(Buffer->IsComplete && "serialization did not complete");
+ auto &SerializedAST = Buffer->Data;
+ auto Size = SerializedAST.size();
+ auto Int8Ty = llvm::Type::getInt8Ty(*VMContext);
+ auto *Ty = llvm::ArrayType::get(Int8Ty, Size);
+ auto *Data = llvm::ConstantDataArray::getString(
+ *VMContext, StringRef(SerializedAST.data(), Size),
+ /*AddNull=*/false);
+ auto *ASTSym = new llvm::GlobalVariable(
+ *M, Ty, /*constant*/ true, llvm::GlobalVariable::InternalLinkage, Data,
+ "__clang_ast");
+ // The on-disk hashtable needs to be aligned.
+ ASTSym->setAlignment(8);
+
+ // Mach-O also needs a segment name.
+ if (Triple.isOSBinFormatMachO())
+ ASTSym->setSection("__CLANG,__clangast");
+ // COFF has an eight character length limit.
+ else if (Triple.isOSBinFormatCOFF())
+ ASTSym->setSection("clangast");
+ else
+ ASTSym->setSection("__clangast");
+
+ DEBUG({
+ // Print the IR for the PCH container to the debug output.
+ llvm::SmallString<0> Buffer;
+ llvm::raw_svector_ostream OS(Buffer);
+ clang::EmitBackendOutput(Diags, CodeGenOpts, TargetOpts, LangOpts,
+ Ctx.getTargetInfo().getDataLayoutString(),
+ M.get(), BackendAction::Backend_EmitLL, &OS);
+ llvm::dbgs() << Buffer;
+ });
+
+ // Use the LLVM backend to emit the pch container.
+ clang::EmitBackendOutput(Diags, CodeGenOpts, TargetOpts, LangOpts,
+ Ctx.getTargetInfo().getDataLayoutString(),
+ M.get(), BackendAction::Backend_EmitObj, OS);
+
+ // Make sure the pch container hits disk.
+ OS->flush();
+
+ // Free the memory for the temporary buffer.
+ llvm::SmallVector<char, 0> Empty;
+ SerializedAST = std::move(Empty);
+ }
+};
+
+} // anonymous namespace
+
+std::unique_ptr<ASTConsumer>
+ObjectFilePCHContainerWriter::CreatePCHContainerGenerator(
+ CompilerInstance &CI, const std::string &MainFileName,
+ const std::string &OutputFileName, llvm::raw_pwrite_stream *OS,
+ std::shared_ptr<PCHBuffer> Buffer) const {
+ return llvm::make_unique<PCHContainerGenerator>(CI, MainFileName,
+ OutputFileName, OS, Buffer);
+}
+
+void ObjectFilePCHContainerReader::ExtractPCH(
+ llvm::MemoryBufferRef Buffer, llvm::BitstreamReader &StreamFile) const {
+ if (auto OF = llvm::object::ObjectFile::createObjectFile(Buffer)) {
+ auto *Obj = OF.get().get();
+ bool IsCOFF = isa<llvm::object::COFFObjectFile>(Obj);
+ // Find the clang AST section in the container.
+ for (auto &Section : OF->get()->sections()) {
+ StringRef Name;
+ Section.getName(Name);
+ if ((!IsCOFF && Name == "__clangast") ||
+ ( IsCOFF && Name == "clangast")) {
+ StringRef Buf;
+ Section.getContents(Buf);
+ StreamFile.init((const unsigned char *)Buf.begin(),
+ (const unsigned char *)Buf.end());
+ return;
+ }
+ }
+ }
+
+ // As a fallback, treat the buffer as a raw AST.
+ StreamFile.init((const unsigned char *)Buffer.getBufferStart(),
+ (const unsigned char *)Buffer.getBufferEnd());
+}