forked from OSchip/llvm-project
340 lines
12 KiB
C++
340 lines
12 KiB
C++
//===--- ObjectFilePCHContainerOperations.cpp -----------------------------===//
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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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#include "clang/CodeGen/ObjectFilePCHContainerOperations.h"
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#include "CGDebugInfo.h"
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#include "CodeGenModule.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/Expr.h"
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#include "clang/AST/RecursiveASTVisitor.h"
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#include "clang/Basic/Diagnostic.h"
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#include "clang/Basic/TargetInfo.h"
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#include "clang/CodeGen/BackendUtil.h"
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#include "clang/Frontend/CodeGenOptions.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "clang/Lex/HeaderSearch.h"
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Serialization/ASTWriter.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Bitcode/BitstreamReader.h"
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#include "llvm/DebugInfo/DWARF/DWARFContext.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/TargetRegistry.h"
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#include <memory>
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#include <utility>
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using namespace clang;
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#define DEBUG_TYPE "pchcontainer"
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namespace {
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class PCHContainerGenerator : public ASTConsumer {
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DiagnosticsEngine &Diags;
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const std::string MainFileName;
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const std::string OutputFileName;
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ASTContext *Ctx;
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ModuleMap &MMap;
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const HeaderSearchOptions &HeaderSearchOpts;
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const PreprocessorOptions &PreprocessorOpts;
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CodeGenOptions CodeGenOpts;
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const TargetOptions TargetOpts;
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const LangOptions LangOpts;
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std::unique_ptr<llvm::LLVMContext> VMContext;
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std::unique_ptr<llvm::Module> M;
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std::unique_ptr<CodeGen::CodeGenModule> Builder;
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raw_pwrite_stream *OS;
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std::shared_ptr<PCHBuffer> Buffer;
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/// Visit every type and emit debug info for it.
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struct DebugTypeVisitor : public RecursiveASTVisitor<DebugTypeVisitor> {
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clang::CodeGen::CGDebugInfo &DI;
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ASTContext &Ctx;
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DebugTypeVisitor(clang::CodeGen::CGDebugInfo &DI, ASTContext &Ctx)
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: DI(DI), Ctx(Ctx) {}
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/// Determine whether this type can be represented in DWARF.
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static bool CanRepresent(const Type *Ty) {
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return !Ty->isDependentType() && !Ty->isUndeducedType();
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}
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bool VisitImportDecl(ImportDecl *D) {
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auto *Import = cast<ImportDecl>(D);
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if (!Import->getImportedOwningModule())
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DI.EmitImportDecl(*Import);
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return true;
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}
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bool VisitTypeDecl(TypeDecl *D) {
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// TagDecls may be deferred until after all decls have been merged and we
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// know the complete type. Pure forward declarations will be skipped, but
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// they don't need to be emitted into the module anyway.
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if (auto *TD = dyn_cast<TagDecl>(D))
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if (!TD->isCompleteDefinition())
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return true;
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QualType QualTy = Ctx.getTypeDeclType(D);
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if (!QualTy.isNull() && CanRepresent(QualTy.getTypePtr()))
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DI.getOrCreateStandaloneType(QualTy, D->getLocation());
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return true;
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}
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bool VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
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QualType QualTy(D->getTypeForDecl(), 0);
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if (!QualTy.isNull() && CanRepresent(QualTy.getTypePtr()))
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DI.getOrCreateStandaloneType(QualTy, D->getLocation());
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return true;
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}
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bool VisitFunctionDecl(FunctionDecl *D) {
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if (isa<CXXMethodDecl>(D))
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// This is not yet supported. Constructing the `this' argument
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// mandates a CodeGenFunction.
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return true;
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SmallVector<QualType, 16> ArgTypes;
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for (auto i : D->params())
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ArgTypes.push_back(i->getType());
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QualType RetTy = D->getReturnType();
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QualType FnTy = Ctx.getFunctionType(RetTy, ArgTypes,
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FunctionProtoType::ExtProtoInfo());
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if (CanRepresent(FnTy.getTypePtr()))
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DI.EmitFunctionDecl(D, D->getLocation(), FnTy);
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return true;
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}
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bool VisitObjCMethodDecl(ObjCMethodDecl *D) {
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if (!D->getClassInterface())
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return true;
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bool selfIsPseudoStrong, selfIsConsumed;
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SmallVector<QualType, 16> ArgTypes;
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ArgTypes.push_back(D->getSelfType(Ctx, D->getClassInterface(),
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selfIsPseudoStrong, selfIsConsumed));
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ArgTypes.push_back(Ctx.getObjCSelType());
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for (auto i : D->params())
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ArgTypes.push_back(i->getType());
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QualType RetTy = D->getReturnType();
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QualType FnTy = Ctx.getFunctionType(RetTy, ArgTypes,
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FunctionProtoType::ExtProtoInfo());
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if (CanRepresent(FnTy.getTypePtr()))
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DI.EmitFunctionDecl(D, D->getLocation(), FnTy);
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return true;
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}
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};
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public:
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PCHContainerGenerator(CompilerInstance &CI, const std::string &MainFileName,
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const std::string &OutputFileName,
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raw_pwrite_stream *OS,
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std::shared_ptr<PCHBuffer> Buffer)
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: Diags(CI.getDiagnostics()), MainFileName(MainFileName),
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OutputFileName(OutputFileName), Ctx(nullptr),
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MMap(CI.getPreprocessor().getHeaderSearchInfo().getModuleMap()),
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HeaderSearchOpts(CI.getHeaderSearchOpts()),
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PreprocessorOpts(CI.getPreprocessorOpts()),
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TargetOpts(CI.getTargetOpts()), LangOpts(CI.getLangOpts()), OS(OS),
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Buffer(std::move(Buffer)) {
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// The debug info output isn't affected by CodeModel and
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// ThreadModel, but the backend expects them to be nonempty.
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CodeGenOpts.CodeModel = "default";
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CodeGenOpts.ThreadModel = "single";
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CodeGenOpts.DebugTypeExtRefs = true;
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CodeGenOpts.setDebugInfo(codegenoptions::FullDebugInfo);
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CodeGenOpts.setDebuggerTuning(CI.getCodeGenOpts().getDebuggerTuning());
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}
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~PCHContainerGenerator() override = default;
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void Initialize(ASTContext &Context) override {
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assert(!Ctx && "initialized multiple times");
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Ctx = &Context;
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VMContext.reset(new llvm::LLVMContext());
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M.reset(new llvm::Module(MainFileName, *VMContext));
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M->setDataLayout(Ctx->getTargetInfo().getDataLayout());
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Builder.reset(new CodeGen::CodeGenModule(
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*Ctx, HeaderSearchOpts, PreprocessorOpts, CodeGenOpts, *M, Diags));
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// Prepare CGDebugInfo to emit debug info for a clang module.
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auto *DI = Builder->getModuleDebugInfo();
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StringRef ModuleName = llvm::sys::path::filename(MainFileName);
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DI->setPCHDescriptor({ModuleName, "", OutputFileName, ~1ULL});
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DI->setModuleMap(MMap);
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}
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bool HandleTopLevelDecl(DeclGroupRef D) override {
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if (Diags.hasErrorOccurred())
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return true;
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// Collect debug info for all decls in this group.
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for (auto *I : D)
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if (!I->isFromASTFile()) {
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DebugTypeVisitor DTV(*Builder->getModuleDebugInfo(), *Ctx);
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DTV.TraverseDecl(I);
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}
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return true;
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}
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void HandleTopLevelDeclInObjCContainer(DeclGroupRef D) override {
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HandleTopLevelDecl(D);
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}
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void HandleTagDeclDefinition(TagDecl *D) override {
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if (Diags.hasErrorOccurred())
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return;
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if (D->isFromASTFile())
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return;
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// Anonymous tag decls are deferred until we are building their declcontext.
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if (D->getName().empty())
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return;
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// Defer tag decls until their declcontext is complete.
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auto *DeclCtx = D->getDeclContext();
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while (DeclCtx) {
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if (auto *D = dyn_cast<TagDecl>(DeclCtx))
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if (!D->isCompleteDefinition())
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return;
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DeclCtx = DeclCtx->getParent();
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}
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DebugTypeVisitor DTV(*Builder->getModuleDebugInfo(), *Ctx);
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DTV.TraverseDecl(D);
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Builder->UpdateCompletedType(D);
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}
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void HandleTagDeclRequiredDefinition(const TagDecl *D) override {
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if (Diags.hasErrorOccurred())
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return;
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if (const RecordDecl *RD = dyn_cast<RecordDecl>(D))
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Builder->getModuleDebugInfo()->completeRequiredType(RD);
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}
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/// Emit a container holding the serialized AST.
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void HandleTranslationUnit(ASTContext &Ctx) override {
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assert(M && VMContext && Builder);
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// Delete these on function exit.
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std::unique_ptr<llvm::LLVMContext> VMContext = std::move(this->VMContext);
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std::unique_ptr<llvm::Module> M = std::move(this->M);
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std::unique_ptr<CodeGen::CodeGenModule> Builder = std::move(this->Builder);
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if (Diags.hasErrorOccurred())
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return;
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M->setTargetTriple(Ctx.getTargetInfo().getTriple().getTriple());
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M->setDataLayout(Ctx.getTargetInfo().getDataLayout());
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// PCH files don't have a signature field in the control block,
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// but LLVM detects DWO CUs by looking for a non-zero DWO id.
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uint64_t Signature = Buffer->Signature ? Buffer->Signature : ~1ULL;
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Builder->getModuleDebugInfo()->setDwoId(Signature);
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// Finalize the Builder.
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if (Builder)
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Builder->Release();
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// Ensure the target exists.
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std::string Error;
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auto Triple = Ctx.getTargetInfo().getTriple();
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if (!llvm::TargetRegistry::lookupTarget(Triple.getTriple(), Error))
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llvm::report_fatal_error(Error);
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// Emit the serialized Clang AST into its own section.
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assert(Buffer->IsComplete && "serialization did not complete");
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auto &SerializedAST = Buffer->Data;
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auto Size = SerializedAST.size();
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auto Int8Ty = llvm::Type::getInt8Ty(*VMContext);
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auto *Ty = llvm::ArrayType::get(Int8Ty, Size);
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auto *Data = llvm::ConstantDataArray::getString(
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*VMContext, StringRef(SerializedAST.data(), Size),
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/*AddNull=*/false);
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auto *ASTSym = new llvm::GlobalVariable(
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*M, Ty, /*constant*/ true, llvm::GlobalVariable::InternalLinkage, Data,
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"__clang_ast");
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// The on-disk hashtable needs to be aligned.
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ASTSym->setAlignment(8);
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// Mach-O also needs a segment name.
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if (Triple.isOSBinFormatMachO())
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ASTSym->setSection("__CLANG,__clangast");
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// COFF has an eight character length limit.
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else if (Triple.isOSBinFormatCOFF())
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ASTSym->setSection("clangast");
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else
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ASTSym->setSection("__clangast");
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DEBUG({
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// Print the IR for the PCH container to the debug output.
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llvm::SmallString<0> Buffer;
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llvm::raw_svector_ostream OS(Buffer);
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clang::EmitBackendOutput(Diags, CodeGenOpts, TargetOpts, LangOpts,
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Ctx.getTargetInfo().getDataLayout(), M.get(),
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BackendAction::Backend_EmitLL, &OS);
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llvm::dbgs() << Buffer;
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});
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// Use the LLVM backend to emit the pch container.
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clang::EmitBackendOutput(Diags, CodeGenOpts, TargetOpts, LangOpts,
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Ctx.getTargetInfo().getDataLayout(), M.get(),
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BackendAction::Backend_EmitObj, OS);
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// Make sure the pch container hits disk.
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OS->flush();
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// Free the memory for the temporary buffer.
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llvm::SmallVector<char, 0> Empty;
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SerializedAST = std::move(Empty);
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}
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};
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} // anonymous namespace
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std::unique_ptr<ASTConsumer>
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ObjectFilePCHContainerWriter::CreatePCHContainerGenerator(
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CompilerInstance &CI, const std::string &MainFileName,
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const std::string &OutputFileName, llvm::raw_pwrite_stream *OS,
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std::shared_ptr<PCHBuffer> Buffer) const {
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return llvm::make_unique<PCHContainerGenerator>(CI, MainFileName,
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OutputFileName, OS, Buffer);
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}
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void ObjectFilePCHContainerReader::ExtractPCH(
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llvm::MemoryBufferRef Buffer, llvm::BitstreamReader &StreamFile) const {
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if (auto OF = llvm::object::ObjectFile::createObjectFile(Buffer)) {
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auto *Obj = OF.get().get();
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bool IsCOFF = isa<llvm::object::COFFObjectFile>(Obj);
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// Find the clang AST section in the container.
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for (auto &Section : OF->get()->sections()) {
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StringRef Name;
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Section.getName(Name);
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if ((!IsCOFF && Name == "__clangast") ||
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( IsCOFF && Name == "clangast")) {
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StringRef Buf;
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Section.getContents(Buf);
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StreamFile.init((const unsigned char *)Buf.begin(),
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(const unsigned char *)Buf.end());
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return;
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}
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}
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}
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// As a fallback, treat the buffer as a raw AST.
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StreamFile.init((const unsigned char *)Buffer.getBufferStart(),
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(const unsigned char *)Buffer.getBufferEnd());
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}
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