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llvm-project/clang/lib/CodeGen/ObjectFilePCHContainerOperations.cpp
Saleem Abdulrasool 10a4972a8d revert SVN r265702, r265640 
Revert the two changes to thread CodeGenOptions into the TargetInfo allocation
and to fix the layering violation by moving CodeGenOptions into Basic.
Code Generation is arguably not particularly "basic".  This addresses Richard's
post-commit review comments.  This change purely does the mechanical revert and
will be followed up with an alternate approach to thread the desired information
into TargetInfo.

llvm-svn: 265806
2016-04-08 16:52:00 +00:00

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//===--- 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/HeaderSearch.h"
#include "clang/Lex/Preprocessor.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/Path.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;
const std::string OutputFileName;
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) {
// TagDecls may be deferred until after all decls have been merged and we
// know the complete type. Pure forward declarations will be skipped, but
// they don't need to be emitted into the module anyway.
if (auto *TD = dyn_cast<TagDecl>(D))
if (!TD->isCompleteDefinition())
return true;
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()), MainFileName(MainFileName),
OutputFileName(OutputFileName), 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().getDataLayout());
Builder.reset(new CodeGen::CodeGenModule(
*Ctx, HeaderSearchOpts, PreprocessorOpts, CodeGenOpts, *M, Diags));
// Prepare CGDebugInfo to emit debug info for a clang module.
auto *DI = Builder->getModuleDebugInfo();
StringRef ModuleName = llvm::sys::path::filename(MainFileName);
DI->setPCHDescriptor({ModuleName, "", OutputFileName, ~1ULL});
DI->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;
if (D->isFromASTFile())
return;
// Anonymous tag decls are deferred until we are building their declcontext.
if (D->getName().empty())
return;
// Defer tag decls until their declcontext is complete.
auto *DeclCtx = D->getDeclContext();
while (DeclCtx) {
if (auto *D = dyn_cast<TagDecl>(DeclCtx))
if (!D->isCompleteDefinition())
return;
DeclCtx = DeclCtx->getParent();
}
DebugTypeVisitor DTV(*Builder->getModuleDebugInfo(), *Ctx);
DTV.TraverseDecl(D);
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().getDataLayout());
// PCH files don't have a signature field in the control block,
// but LLVM detects DWO CUs by looking for a non-zero DWO id.
uint64_t Signature = Buffer->Signature ? Buffer->Signature : ~1ULL;
Builder->getModuleDebugInfo()->setDwoId(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().getDataLayout(), 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().getDataLayout(), 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());
}
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