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//===- IRObjectFile.cpp - IR object file implementation ---------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Part of the IRObjectFile class implementation.
//
//===----------------------------------------------------------------------===//
#include "llvm/Object/IRObjectFile.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/BinaryFormat/Magic.h"
#include "llvm/Bitcode/BitcodeReader.h"
#include "llvm/IR/GVMaterializer.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Mangler.h"
#include "llvm/IR/Module.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using namespace object;
IRObjectFile::IRObjectFile(MemoryBufferRef Object,
std::vector<std::unique_ptr<Module>> Mods)
: SymbolicFile(Binary::ID_IR, Object), Mods(std::move(Mods)) {
for (auto &M : this->Mods)
SymTab.addModule(M.get());
}
IRObjectFile::~IRObjectFile() {}
static ModuleSymbolTable::Symbol getSym(DataRefImpl &Symb) {
return *reinterpret_cast<ModuleSymbolTable::Symbol *>(Symb.p);
}
void IRObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
Symb.p += sizeof(ModuleSymbolTable::Symbol);
}
Error IRObjectFile::printSymbolName(raw_ostream &OS, DataRefImpl Symb) const {
SymTab.printSymbolName(OS, getSym(Symb));
return Error::success();
}
Expected<uint32_t> IRObjectFile::getSymbolFlags(DataRefImpl Symb) const {
return SymTab.getSymbolFlags(getSym(Symb));
}
basic_symbol_iterator IRObjectFile::symbol_begin() const {
DataRefImpl Ret;
Ret.p = reinterpret_cast<uintptr_t>(SymTab.symbols().data());
return basic_symbol_iterator(BasicSymbolRef(Ret, this));
}
basic_symbol_iterator IRObjectFile::symbol_end() const {
DataRefImpl Ret;
Ret.p = reinterpret_cast<uintptr_t>(SymTab.symbols().data() +
SymTab.symbols().size());
return basic_symbol_iterator(BasicSymbolRef(Ret, this));
}
StringRef IRObjectFile::getTargetTriple() const {
// Each module must have the same target triple, so we arbitrarily access the
// first one.
return Mods[0]->getTargetTriple();
}
Expected<MemoryBufferRef>
IRObjectFile::findBitcodeInObject(const ObjectFile &Obj) {
for (const SectionRef &Sec : Obj.sections()) {
if (Sec.isBitcode()) {
Expected<StringRef> Contents = Sec.getContents();
if (!Contents)
return Contents.takeError();
if (Contents->size() <= 1)
return errorCodeToError(object_error::bitcode_section_not_found);
return MemoryBufferRef(*Contents, Obj.getFileName());
}
}
return errorCodeToError(object_error::bitcode_section_not_found);
}
Expected<MemoryBufferRef>
IRObjectFile::findBitcodeInMemBuffer(MemoryBufferRef Object) {
file_magic Type = identify_magic(Object.getBuffer());
switch (Type) {
case file_magic::bitcode:
return Object;
case file_magic::elf_relocatable:
case file_magic::macho_object:
case file_magic::wasm_object:
case file_magic::coff_object: {
Expected<std::unique_ptr<ObjectFile>> ObjFile =
ObjectFile::createObjectFile(Object, Type);
if (!ObjFile)
return ObjFile.takeError();
return findBitcodeInObject(*ObjFile->get());
}
default:
return errorCodeToError(object_error::invalid_file_type);
}
}
Expected<std::unique_ptr<IRObjectFile>>
IRObjectFile::create(MemoryBufferRef Object, LLVMContext &Context) {
Expected<MemoryBufferRef> BCOrErr = findBitcodeInMemBuffer(Object);
if (!BCOrErr)
return BCOrErr.takeError();
Expected<std::vector<BitcodeModule>> BMsOrErr =
getBitcodeModuleList(*BCOrErr);
if (!BMsOrErr)
return BMsOrErr.takeError();
std::vector<std::unique_ptr<Module>> Mods;
for (auto BM : *BMsOrErr) {
Expected<std::unique_ptr<Module>> MOrErr =
BM.getLazyModule(Context, /*ShouldLazyLoadMetadata*/ true,
/*IsImporting*/ false);
if (!MOrErr)
return MOrErr.takeError();
Mods.push_back(std::move(*MOrErr));
}
return std::unique_ptr<IRObjectFile>(
new IRObjectFile(*BCOrErr, std::move(Mods)));
}
Expected<IRSymtabFile> object::readIRSymtab(MemoryBufferRef MBRef) {
IRSymtabFile F;
Expected<MemoryBufferRef> BCOrErr =
IRObjectFile::findBitcodeInMemBuffer(MBRef);
if (!BCOrErr)
return BCOrErr.takeError();
Expected<BitcodeFileContents> BFCOrErr = getBitcodeFileContents(*BCOrErr);
if (!BFCOrErr)
return BFCOrErr.takeError();
Expected<irsymtab::FileContents> FCOrErr = irsymtab::readBitcode(*BFCOrErr);
if (!FCOrErr)
return FCOrErr.takeError();
F.Mods = std::move(BFCOrErr->Mods);
F.Symtab = std::move(FCOrErr->Symtab);
F.Strtab = std::move(FCOrErr->Strtab);
F.TheReader = std::move(FCOrErr->TheReader);
return std::move(F);
}
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