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e4018b9baa
To do this, change the representation of lazy loaded functions. The previous representation cannot differentiate between a function whose body has been removed and one whose body hasn't been read from the .bc file. That means that in order to drop a function, the entire body had to be read. llvm-svn: 220580
310 lines
8.8 KiB
C++
310 lines
8.8 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/Bitcode/ReaderWriter.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/GVMaterializer.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/MCRegisterInfo.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/MCTargetAsmParser.h"
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#include "llvm/MC/MCParser/MCAsmParser.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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// If we have a DataLayout, setup a mangler.
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const DataLayout *DL = M->getDataLayout();
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if (!DL)
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return;
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Mang.reset(new Mangler(DL));
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const std::string &InlineAsm = M->getModuleInlineAsm();
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if (InlineAsm.empty())
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return;
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StringRef Triple = M->getTargetTriple();
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std::string Err;
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const Target *T = TargetRegistry::lookupTarget(Triple, Err);
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if (!T)
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return;
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std::unique_ptr<MCRegisterInfo> MRI(T->createMCRegInfo(Triple));
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if (!MRI)
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return;
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std::unique_ptr<MCAsmInfo> MAI(T->createMCAsmInfo(*MRI, Triple));
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if (!MAI)
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return;
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std::unique_ptr<MCSubtargetInfo> STI(
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T->createMCSubtargetInfo(Triple, "", ""));
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if (!STI)
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return;
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std::unique_ptr<MCInstrInfo> MCII(T->createMCInstrInfo());
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if (!MCII)
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return;
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MCObjectFileInfo MOFI;
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MCContext MCCtx(MAI.get(), MRI.get(), &MOFI);
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MOFI.InitMCObjectFileInfo(Triple, Reloc::Default, CodeModel::Default, MCCtx);
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std::unique_ptr<RecordStreamer> Streamer(new RecordStreamer(MCCtx));
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std::unique_ptr<MemoryBuffer> Buffer(MemoryBuffer::getMemBuffer(InlineAsm));
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SourceMgr SrcMgr;
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SrcMgr.AddNewSourceBuffer(std::move(Buffer), SMLoc());
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std::unique_ptr<MCAsmParser> Parser(
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createMCAsmParser(SrcMgr, MCCtx, *Streamer, *MAI));
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MCTargetOptions MCOptions;
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std::unique_ptr<MCTargetAsmParser> TAP(
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T->createMCAsmParser(*STI, *Parser, *MCII, MCOptions));
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if (!TAP)
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return;
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Parser->setTargetParser(*TAP);
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if (Parser->Run(false))
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return;
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for (auto &KV : *Streamer) {
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StringRef Key = KV.first();
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RecordStreamer::State Value = KV.second;
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uint32_t Res = BasicSymbolRef::SF_None;
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switch (Value) {
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case RecordStreamer::NeverSeen:
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llvm_unreachable("foo");
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case RecordStreamer::DefinedGlobal:
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Res |= BasicSymbolRef::SF_Global;
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break;
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case RecordStreamer::Defined:
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break;
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case RecordStreamer::Global:
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case RecordStreamer::Used:
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Res |= BasicSymbolRef::SF_Undefined;
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Res |= BasicSymbolRef::SF_Global;
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break;
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}
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AsmSymbols.push_back(
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std::make_pair<std::string, uint32_t>(Key, std::move(Res)));
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}
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}
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IRObjectFile::~IRObjectFile() {
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}
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static const GlobalValue *getGV(DataRefImpl &Symb) {
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if ((Symb.p & 3) == 3)
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return nullptr;
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return reinterpret_cast<GlobalValue*>(Symb.p & ~uintptr_t(3));
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}
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static uintptr_t skipEmpty(Module::const_alias_iterator I, const Module &M) {
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if (I == M.alias_end())
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return 3;
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const GlobalValue *GV = &*I;
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return reinterpret_cast<uintptr_t>(GV) | 2;
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}
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static uintptr_t skipEmpty(Module::const_global_iterator I, const Module &M) {
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if (I == M.global_end())
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return skipEmpty(M.alias_begin(), M);
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const GlobalValue *GV = &*I;
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return reinterpret_cast<uintptr_t>(GV) | 1;
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}
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static uintptr_t skipEmpty(Module::const_iterator I, const Module &M) {
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if (I == M.end())
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return skipEmpty(M.global_begin(), M);
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const GlobalValue *GV = &*I;
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return reinterpret_cast<uintptr_t>(GV) | 0;
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}
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static unsigned getAsmSymIndex(DataRefImpl Symb) {
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assert((Symb.p & uintptr_t(3)) == 3);
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uintptr_t Index = Symb.p & ~uintptr_t(3);
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Index >>= 2;
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return Index;
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}
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void IRObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
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const GlobalValue *GV = getGV(Symb);
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uintptr_t Res;
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switch (Symb.p & 3) {
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case 0: {
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Module::const_iterator Iter(static_cast<const Function*>(GV));
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++Iter;
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Res = skipEmpty(Iter, *M);
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break;
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}
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case 1: {
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Module::const_global_iterator Iter(static_cast<const GlobalVariable*>(GV));
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++Iter;
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Res = skipEmpty(Iter, *M);
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break;
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}
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case 2: {
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Module::const_alias_iterator Iter(static_cast<const GlobalAlias*>(GV));
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++Iter;
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Res = skipEmpty(Iter, *M);
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break;
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}
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case 3: {
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unsigned Index = getAsmSymIndex(Symb);
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assert(Index < AsmSymbols.size());
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++Index;
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Res = (Index << 2) | 3;
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break;
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}
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}
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Symb.p = Res;
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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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const GlobalValue *GV = getGV(Symb);
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if (!GV) {
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unsigned Index = getAsmSymIndex(Symb);
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assert(Index <= AsmSymbols.size());
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OS << AsmSymbols[Index].first;
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return object_error::success;;
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}
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if (Mang)
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Mang->getNameWithPrefix(OS, GV, false);
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else
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OS << GV->getName();
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return object_error::success;
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}
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uint32_t IRObjectFile::getSymbolFlags(DataRefImpl Symb) const {
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const GlobalValue *GV = getGV(Symb);
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if (!GV) {
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unsigned Index = getAsmSymIndex(Symb);
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assert(Index <= AsmSymbols.size());
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return AsmSymbols[Index].second;
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}
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uint32_t Res = BasicSymbolRef::SF_None;
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if (GV->isDeclarationForLinker())
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Res |= BasicSymbolRef::SF_Undefined;
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if (GV->hasPrivateLinkage())
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Res |= BasicSymbolRef::SF_FormatSpecific;
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if (!GV->hasLocalLinkage())
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Res |= BasicSymbolRef::SF_Global;
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if (GV->hasCommonLinkage())
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Res |= BasicSymbolRef::SF_Common;
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if (GV->hasLinkOnceLinkage() || GV->hasWeakLinkage())
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Res |= BasicSymbolRef::SF_Weak;
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if (GV->getName().startswith("llvm."))
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Res |= BasicSymbolRef::SF_FormatSpecific;
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else if (auto *Var = dyn_cast<GlobalVariable>(GV)) {
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if (Var->getSection() == StringRef("llvm.metadata"))
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Res |= BasicSymbolRef::SF_FormatSpecific;
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}
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return Res;
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}
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const GlobalValue *IRObjectFile::getSymbolGV(DataRefImpl Symb) const {
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const GlobalValue *GV = getGV(Symb);
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return GV;
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}
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basic_symbol_iterator IRObjectFile::symbol_begin_impl() const {
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Module::const_iterator I = M->begin();
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DataRefImpl Ret;
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Ret.p = skipEmpty(I, *M);
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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_impl() const {
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DataRefImpl Ret;
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uint64_t NumAsm = AsmSymbols.size();
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NumAsm <<= 2;
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Ret.p = 3 | NumAsm;
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return basic_symbol_iterator(BasicSymbolRef(Ret, this));
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}
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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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StringRef SecName;
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if (std::error_code EC = Sec.getName(SecName))
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return EC;
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if (SecName == ".llvmbc") {
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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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ErrorOr<std::unique_ptr<ObjectFile>> ObjFile =
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ObjectFile::createObjectFile(Object, Type);
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if (!ObjFile)
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return ObjFile.getError();
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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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ErrorOr<std::unique_ptr<IRObjectFile>>
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llvm::object::IRObjectFile::createIRObjectFile(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 BCOrErr.getError();
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std::unique_ptr<MemoryBuffer> Buff(
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MemoryBuffer::getMemBuffer(BCOrErr.get(), false));
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ErrorOr<Module *> MOrErr = getLazyBitcodeModule(std::move(Buff), Context);
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if (std::error_code EC = MOrErr.getError())
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return EC;
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std::unique_ptr<Module> M(MOrErr.get());
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return llvm::make_unique<IRObjectFile>(Object, std::move(M));
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}
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