llvm/lib/Object/IRObjectFile.cpp

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//===- IRObjectFile.cpp - IR object file implementation ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Part of the IRObjectFile class implementation.
//
//===----------------------------------------------------------------------===//
#include "llvm/Object/IRObjectFile.h"
#include "RecordStreamer.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/GVMaterializer.h"
#include "llvm/IR/Mangler.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCTargetAsmParser.h"
#include "llvm/MC/MCParser/MCAsmParser.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using namespace object;
IRObjectFile::IRObjectFile(MemoryBufferRef Object, std::unique_ptr<Module> Mod)
: SymbolicFile(Binary::ID_IR, Object), M(std::move(Mod)) {
// If we have a DataLayout, setup a mangler.
const DataLayout *DL = M->getDataLayout();
if (!DL)
return;
Mang.reset(new Mangler(DL));
const std::string &InlineAsm = M->getModuleInlineAsm();
if (InlineAsm.empty())
return;
StringRef Triple = M->getTargetTriple();
std::string Err;
const Target *T = TargetRegistry::lookupTarget(Triple, Err);
if (!T)
return;
std::unique_ptr<MCRegisterInfo> MRI(T->createMCRegInfo(Triple));
if (!MRI)
return;
std::unique_ptr<MCAsmInfo> MAI(T->createMCAsmInfo(*MRI, Triple));
if (!MAI)
return;
std::unique_ptr<MCSubtargetInfo> STI(
T->createMCSubtargetInfo(Triple, "", ""));
if (!STI)
return;
std::unique_ptr<MCInstrInfo> MCII(T->createMCInstrInfo());
if (!MCII)
return;
MCObjectFileInfo MOFI;
MCContext MCCtx(MAI.get(), MRI.get(), &MOFI);
MOFI.InitMCObjectFileInfo(Triple, Reloc::Default, CodeModel::Default, MCCtx);
std::unique_ptr<RecordStreamer> Streamer(new RecordStreamer(MCCtx));
std::unique_ptr<MemoryBuffer> Buffer(MemoryBuffer::getMemBuffer(InlineAsm));
SourceMgr SrcMgr;
SrcMgr.AddNewSourceBuffer(std::move(Buffer), SMLoc());
std::unique_ptr<MCAsmParser> Parser(
createMCAsmParser(SrcMgr, MCCtx, *Streamer, *MAI));
MCTargetOptions MCOptions;
std::unique_ptr<MCTargetAsmParser> TAP(
T->createMCAsmParser(*STI, *Parser, *MCII, MCOptions));
if (!TAP)
return;
Parser->setTargetParser(*TAP);
if (Parser->Run(false))
return;
for (auto &KV : *Streamer) {
StringRef Key = KV.first();
RecordStreamer::State Value = KV.second;
uint32_t Res = BasicSymbolRef::SF_None;
switch (Value) {
case RecordStreamer::NeverSeen:
llvm_unreachable("foo");
case RecordStreamer::DefinedGlobal:
Res |= BasicSymbolRef::SF_Global;
break;
case RecordStreamer::Defined:
break;
case RecordStreamer::Global:
case RecordStreamer::Used:
Res |= BasicSymbolRef::SF_Undefined;
Res |= BasicSymbolRef::SF_Global;
break;
}
AsmSymbols.push_back(
std::make_pair<std::string, uint32_t>(Key, std::move(Res)));
}
}
IRObjectFile::~IRObjectFile() {
}
static GlobalValue *getGV(DataRefImpl &Symb) {
if ((Symb.p & 3) == 3)
return nullptr;
return reinterpret_cast<GlobalValue*>(Symb.p & ~uintptr_t(3));
}
static uintptr_t skipEmpty(Module::const_alias_iterator I, const Module &M) {
if (I == M.alias_end())
return 3;
const GlobalValue *GV = &*I;
return reinterpret_cast<uintptr_t>(GV) | 2;
}
static uintptr_t skipEmpty(Module::const_global_iterator I, const Module &M) {
if (I == M.global_end())
return skipEmpty(M.alias_begin(), M);
const GlobalValue *GV = &*I;
return reinterpret_cast<uintptr_t>(GV) | 1;
}
static uintptr_t skipEmpty(Module::const_iterator I, const Module &M) {
if (I == M.end())
return skipEmpty(M.global_begin(), M);
const GlobalValue *GV = &*I;
return reinterpret_cast<uintptr_t>(GV) | 0;
}
static unsigned getAsmSymIndex(DataRefImpl Symb) {
assert((Symb.p & uintptr_t(3)) == 3);
uintptr_t Index = Symb.p & ~uintptr_t(3);
Index >>= 2;
return Index;
}
void IRObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
const GlobalValue *GV = getGV(Symb);
uintptr_t Res;
switch (Symb.p & 3) {
case 0: {
Module::const_iterator Iter(static_cast<const Function*>(GV));
++Iter;
Res = skipEmpty(Iter, *M);
break;
}
case 1: {
Module::const_global_iterator Iter(static_cast<const GlobalVariable*>(GV));
++Iter;
Res = skipEmpty(Iter, *M);
break;
}
case 2: {
Module::const_alias_iterator Iter(static_cast<const GlobalAlias*>(GV));
++Iter;
Res = skipEmpty(Iter, *M);
break;
}
case 3: {
unsigned Index = getAsmSymIndex(Symb);
assert(Index < AsmSymbols.size());
++Index;
Res = (Index << 2) | 3;
break;
}
}
Symb.p = Res;
}
std::error_code IRObjectFile::printSymbolName(raw_ostream &OS,
DataRefImpl Symb) const {
const GlobalValue *GV = getGV(Symb);
if (!GV) {
unsigned Index = getAsmSymIndex(Symb);
assert(Index <= AsmSymbols.size());
OS << AsmSymbols[Index].first;
return object_error::success;;
}
if (Mang)
Mang->getNameWithPrefix(OS, GV, false);
else
OS << GV->getName();
return object_error::success;
}
uint32_t IRObjectFile::getSymbolFlags(DataRefImpl Symb) const {
const GlobalValue *GV = getGV(Symb);
if (!GV) {
unsigned Index = getAsmSymIndex(Symb);
assert(Index <= AsmSymbols.size());
return AsmSymbols[Index].second;
}
uint32_t Res = BasicSymbolRef::SF_None;
if (GV->isDeclarationForLinker())
Res |= BasicSymbolRef::SF_Undefined;
if (GV->hasPrivateLinkage())
Res |= BasicSymbolRef::SF_FormatSpecific;
if (!GV->hasLocalLinkage())
Res |= BasicSymbolRef::SF_Global;
if (GV->hasCommonLinkage())
Res |= BasicSymbolRef::SF_Common;
if (GV->hasLinkOnceLinkage() || GV->hasWeakLinkage())
Res |= BasicSymbolRef::SF_Weak;
if (GV->getName().startswith("llvm."))
Res |= BasicSymbolRef::SF_FormatSpecific;
else if (auto *Var = dyn_cast<GlobalVariable>(GV)) {
if (Var->getSection() == StringRef("llvm.metadata"))
Res |= BasicSymbolRef::SF_FormatSpecific;
}
return Res;
}
GlobalValue *IRObjectFile::getSymbolGV(DataRefImpl Symb) { return getGV(Symb); }
std::unique_ptr<Module> IRObjectFile::takeModule() { return std::move(M); }
basic_symbol_iterator IRObjectFile::symbol_begin_impl() const {
Module::const_iterator I = M->begin();
DataRefImpl Ret;
Ret.p = skipEmpty(I, *M);
return basic_symbol_iterator(BasicSymbolRef(Ret, this));
}
basic_symbol_iterator IRObjectFile::symbol_end_impl() const {
DataRefImpl Ret;
uint64_t NumAsm = AsmSymbols.size();
NumAsm <<= 2;
Ret.p = 3 | NumAsm;
return basic_symbol_iterator(BasicSymbolRef(Ret, this));
}
ErrorOr<MemoryBufferRef> IRObjectFile::findBitcodeInObject(const ObjectFile &Obj) {
for (const SectionRef &Sec : Obj.sections()) {
StringRef SecName;
if (std::error_code EC = Sec.getName(SecName))
return EC;
if (SecName == ".llvmbc") {
StringRef SecContents;
if (std::error_code EC = Sec.getContents(SecContents))
return EC;
return MemoryBufferRef(SecContents, Obj.getFileName());
}
}
return object_error::bitcode_section_not_found;
}
ErrorOr<MemoryBufferRef> IRObjectFile::findBitcodeInMemBuffer(MemoryBufferRef Object) {
sys::fs::file_magic Type = sys::fs::identify_magic(Object.getBuffer());
switch (Type) {
case sys::fs::file_magic::bitcode:
return Object;
case sys::fs::file_magic::elf_relocatable:
case sys::fs::file_magic::macho_object:
case sys::fs::file_magic::coff_object: {
ErrorOr<std::unique_ptr<ObjectFile>> ObjFile =
ObjectFile::createObjectFile(Object, Type);
if (!ObjFile)
return ObjFile.getError();
return findBitcodeInObject(*ObjFile->get());
}
default:
return object_error::invalid_file_type;
}
}
ErrorOr<std::unique_ptr<IRObjectFile>>
llvm::object::IRObjectFile::create(MemoryBufferRef Object,
LLVMContext &Context) {
ErrorOr<MemoryBufferRef> BCOrErr = findBitcodeInMemBuffer(Object);
if (!BCOrErr)
return BCOrErr.getError();
std::unique_ptr<MemoryBuffer> Buff(
MemoryBuffer::getMemBuffer(BCOrErr.get(), false));
ErrorOr<Module *> MOrErr = getLazyBitcodeModule(std::move(Buff), Context);
if (std::error_code EC = MOrErr.getError())
return EC;
std::unique_ptr<Module> M(MOrErr.get());
return llvm::make_unique<IRObjectFile>(Object, std::move(M));
}