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This class represents a symbol table built from in-memory IR. It provides access to GlobalValues and should only be used if such access is required (e.g. in the LTO implementation). We will eventually change IRObjectFile to read from a bitcode symbol table rather than using ModuleSymbolTable, so it would not be able to expose the module. Differential Revision: https://reviews.llvm.org/D27073 llvm-svn: 288319
132 lines
4.3 KiB
C++
132 lines
4.3 KiB
C++
//===- IRObjectFile.cpp - IR object file implementation ---------*- C++ -*-===//
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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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//
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// Part of the IRObjectFile class implementation.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/IRObjectFile.h"
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#include "RecordStreamer.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Bitcode/BitcodeReader.h"
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#include "llvm/IR/GVMaterializer.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/IR/Module.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCParser/MCAsmParser.h"
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#include "llvm/MC/MCParser/MCTargetAsmParser.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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using namespace object;
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IRObjectFile::IRObjectFile(MemoryBufferRef Object, std::unique_ptr<Module> Mod)
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: SymbolicFile(Binary::ID_IR, Object), M(std::move(Mod)) {
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SymTab.addModule(M.get());
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}
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IRObjectFile::~IRObjectFile() {}
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static ModuleSymbolTable::Symbol getSym(DataRefImpl &Symb) {
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return *reinterpret_cast<ModuleSymbolTable::Symbol *>(Symb.p);
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}
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void IRObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
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Symb.p += sizeof(ModuleSymbolTable::Symbol);
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}
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std::error_code IRObjectFile::printSymbolName(raw_ostream &OS,
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DataRefImpl Symb) const {
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SymTab.printSymbolName(OS, getSym(Symb));
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return std::error_code();
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}
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uint32_t IRObjectFile::getSymbolFlags(DataRefImpl Symb) const {
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return SymTab.getSymbolFlags(getSym(Symb));
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}
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GlobalValue *IRObjectFile::getSymbolGV(DataRefImpl Symb) {
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return getSym(Symb).dyn_cast<GlobalValue *>();
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}
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std::unique_ptr<Module> IRObjectFile::takeModule() { return std::move(M); }
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basic_symbol_iterator IRObjectFile::symbol_begin() const {
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DataRefImpl Ret;
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Ret.p = reinterpret_cast<uintptr_t>(SymTab.symbols().data());
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return basic_symbol_iterator(BasicSymbolRef(Ret, this));
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}
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basic_symbol_iterator IRObjectFile::symbol_end() const {
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DataRefImpl Ret;
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Ret.p = reinterpret_cast<uintptr_t>(SymTab.symbols().data() +
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SymTab.symbols().size());
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return basic_symbol_iterator(BasicSymbolRef(Ret, this));
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}
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StringRef IRObjectFile::getTargetTriple() const { return M->getTargetTriple(); }
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ErrorOr<MemoryBufferRef> IRObjectFile::findBitcodeInObject(const ObjectFile &Obj) {
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for (const SectionRef &Sec : Obj.sections()) {
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if (Sec.isBitcode()) {
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StringRef SecContents;
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if (std::error_code EC = Sec.getContents(SecContents))
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return EC;
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return MemoryBufferRef(SecContents, Obj.getFileName());
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}
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}
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return object_error::bitcode_section_not_found;
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}
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ErrorOr<MemoryBufferRef> IRObjectFile::findBitcodeInMemBuffer(MemoryBufferRef Object) {
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sys::fs::file_magic Type = sys::fs::identify_magic(Object.getBuffer());
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switch (Type) {
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case sys::fs::file_magic::bitcode:
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return Object;
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case sys::fs::file_magic::elf_relocatable:
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case sys::fs::file_magic::macho_object:
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case sys::fs::file_magic::coff_object: {
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Expected<std::unique_ptr<ObjectFile>> ObjFile =
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ObjectFile::createObjectFile(Object, Type);
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if (!ObjFile)
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return errorToErrorCode(ObjFile.takeError());
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return findBitcodeInObject(*ObjFile->get());
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}
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default:
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return object_error::invalid_file_type;
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}
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}
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Expected<std::unique_ptr<IRObjectFile>>
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llvm::object::IRObjectFile::create(MemoryBufferRef Object,
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LLVMContext &Context) {
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ErrorOr<MemoryBufferRef> BCOrErr = findBitcodeInMemBuffer(Object);
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if (!BCOrErr)
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return errorCodeToError(BCOrErr.getError());
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Expected<std::unique_ptr<Module>> MOrErr =
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getLazyBitcodeModule(*BCOrErr, Context,
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/*ShouldLazyLoadMetadata*/ true);
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if (!MOrErr)
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return MOrErr.takeError();
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std::unique_ptr<Module> &M = MOrErr.get();
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return llvm::make_unique<IRObjectFile>(BCOrErr.get(), std::move(M));
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}
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