1 //===- IRObjectFile.cpp - IR object file implementation ---------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Part of the IRObjectFile class implementation.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Object/IRObjectFile.h"
15 #include "RecordStreamer.h"
16 #include "llvm/ADT/STLExtras.h"
17 #include "llvm/Bitcode/ReaderWriter.h"
18 #include "llvm/IR/GVMaterializer.h"
19 #include "llvm/IR/LLVMContext.h"
20 #include "llvm/IR/Mangler.h"
21 #include "llvm/IR/Module.h"
22 #include "llvm/MC/MCAsmInfo.h"
23 #include "llvm/MC/MCContext.h"
24 #include "llvm/MC/MCInstrInfo.h"
25 #include "llvm/MC/MCObjectFileInfo.h"
26 #include "llvm/MC/MCParser/MCAsmParser.h"
27 #include "llvm/MC/MCRegisterInfo.h"
28 #include "llvm/MC/MCTargetAsmParser.h"
29 #include "llvm/Object/ObjectFile.h"
30 #include "llvm/Support/MemoryBuffer.h"
31 #include "llvm/Support/SourceMgr.h"
32 #include "llvm/Support/TargetRegistry.h"
33 #include "llvm/Support/raw_ostream.h"
35 using namespace object;
37 IRObjectFile::IRObjectFile(MemoryBufferRef Object, std::unique_ptr<Module> Mod)
38 : SymbolicFile(Binary::ID_IR, Object), M(std::move(Mod)) {
39 // If we have a DataLayout, setup a mangler.
40 const DataLayout *DL = M->getDataLayout();
44 Mang.reset(new Mangler(DL));
46 const std::string &InlineAsm = M->getModuleInlineAsm();
47 if (InlineAsm.empty())
50 StringRef Triple = M->getTargetTriple();
52 const Target *T = TargetRegistry::lookupTarget(Triple, Err);
56 std::unique_ptr<MCRegisterInfo> MRI(T->createMCRegInfo(Triple));
60 std::unique_ptr<MCAsmInfo> MAI(T->createMCAsmInfo(*MRI, Triple));
64 std::unique_ptr<MCSubtargetInfo> STI(
65 T->createMCSubtargetInfo(Triple, "", ""));
69 std::unique_ptr<MCInstrInfo> MCII(T->createMCInstrInfo());
73 MCObjectFileInfo MOFI;
74 MCContext MCCtx(MAI.get(), MRI.get(), &MOFI);
75 MOFI.InitMCObjectFileInfo(Triple, Reloc::Default, CodeModel::Default, MCCtx);
76 std::unique_ptr<RecordStreamer> Streamer(new RecordStreamer(MCCtx));
77 T->createNullTargetStreamer(*Streamer);
79 std::unique_ptr<MemoryBuffer> Buffer(MemoryBuffer::getMemBuffer(InlineAsm));
81 SrcMgr.AddNewSourceBuffer(std::move(Buffer), SMLoc());
82 std::unique_ptr<MCAsmParser> Parser(
83 createMCAsmParser(SrcMgr, MCCtx, *Streamer, *MAI));
85 MCTargetOptions MCOptions;
86 std::unique_ptr<MCTargetAsmParser> TAP(
87 T->createMCAsmParser(*STI, *Parser, *MCII, MCOptions));
91 Parser->setTargetParser(*TAP);
92 if (Parser->Run(false))
95 for (auto &KV : *Streamer) {
96 StringRef Key = KV.first();
97 RecordStreamer::State Value = KV.second;
98 uint32_t Res = BasicSymbolRef::SF_None;
100 case RecordStreamer::NeverSeen:
101 llvm_unreachable("foo");
102 case RecordStreamer::DefinedGlobal:
103 Res |= BasicSymbolRef::SF_Global;
105 case RecordStreamer::Defined:
107 case RecordStreamer::Global:
108 case RecordStreamer::Used:
109 Res |= BasicSymbolRef::SF_Undefined;
110 Res |= BasicSymbolRef::SF_Global;
113 AsmSymbols.push_back(
114 std::make_pair<std::string, uint32_t>(Key, std::move(Res)));
118 IRObjectFile::~IRObjectFile() {
121 static GlobalValue *getGV(DataRefImpl &Symb) {
122 if ((Symb.p & 3) == 3)
125 return reinterpret_cast<GlobalValue*>(Symb.p & ~uintptr_t(3));
128 static uintptr_t skipEmpty(Module::const_alias_iterator I, const Module &M) {
129 if (I == M.alias_end())
131 const GlobalValue *GV = &*I;
132 return reinterpret_cast<uintptr_t>(GV) | 2;
135 static uintptr_t skipEmpty(Module::const_global_iterator I, const Module &M) {
136 if (I == M.global_end())
137 return skipEmpty(M.alias_begin(), M);
138 const GlobalValue *GV = &*I;
139 return reinterpret_cast<uintptr_t>(GV) | 1;
142 static uintptr_t skipEmpty(Module::const_iterator I, const Module &M) {
144 return skipEmpty(M.global_begin(), M);
145 const GlobalValue *GV = &*I;
146 return reinterpret_cast<uintptr_t>(GV) | 0;
149 static unsigned getAsmSymIndex(DataRefImpl Symb) {
150 assert((Symb.p & uintptr_t(3)) == 3);
151 uintptr_t Index = Symb.p & ~uintptr_t(3);
156 void IRObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
157 const GlobalValue *GV = getGV(Symb);
160 switch (Symb.p & 3) {
162 Module::const_iterator Iter(static_cast<const Function*>(GV));
164 Res = skipEmpty(Iter, *M);
168 Module::const_global_iterator Iter(static_cast<const GlobalVariable*>(GV));
170 Res = skipEmpty(Iter, *M);
174 Module::const_alias_iterator Iter(static_cast<const GlobalAlias*>(GV));
176 Res = skipEmpty(Iter, *M);
180 unsigned Index = getAsmSymIndex(Symb);
181 assert(Index < AsmSymbols.size());
183 Res = (Index << 2) | 3;
187 llvm_unreachable("unreachable case");
193 std::error_code IRObjectFile::printSymbolName(raw_ostream &OS,
194 DataRefImpl Symb) const {
195 const GlobalValue *GV = getGV(Symb);
197 unsigned Index = getAsmSymIndex(Symb);
198 assert(Index <= AsmSymbols.size());
199 OS << AsmSymbols[Index].first;
200 return object_error::success;;
204 Mang->getNameWithPrefix(OS, GV, false);
208 return object_error::success;
211 uint32_t IRObjectFile::getSymbolFlags(DataRefImpl Symb) const {
212 const GlobalValue *GV = getGV(Symb);
215 unsigned Index = getAsmSymIndex(Symb);
216 assert(Index <= AsmSymbols.size());
217 return AsmSymbols[Index].second;
220 uint32_t Res = BasicSymbolRef::SF_None;
221 if (GV->isDeclarationForLinker())
222 Res |= BasicSymbolRef::SF_Undefined;
223 if (GV->hasPrivateLinkage())
224 Res |= BasicSymbolRef::SF_FormatSpecific;
225 if (!GV->hasLocalLinkage())
226 Res |= BasicSymbolRef::SF_Global;
227 if (GV->hasCommonLinkage())
228 Res |= BasicSymbolRef::SF_Common;
229 if (GV->hasLinkOnceLinkage() || GV->hasWeakLinkage())
230 Res |= BasicSymbolRef::SF_Weak;
232 if (GV->getName().startswith("llvm."))
233 Res |= BasicSymbolRef::SF_FormatSpecific;
234 else if (auto *Var = dyn_cast<GlobalVariable>(GV)) {
235 if (Var->getSection() == StringRef("llvm.metadata"))
236 Res |= BasicSymbolRef::SF_FormatSpecific;
242 GlobalValue *IRObjectFile::getSymbolGV(DataRefImpl Symb) { return getGV(Symb); }
244 std::unique_ptr<Module> IRObjectFile::takeModule() { return std::move(M); }
246 basic_symbol_iterator IRObjectFile::symbol_begin_impl() const {
247 Module::const_iterator I = M->begin();
249 Ret.p = skipEmpty(I, *M);
250 return basic_symbol_iterator(BasicSymbolRef(Ret, this));
253 basic_symbol_iterator IRObjectFile::symbol_end_impl() const {
255 uint64_t NumAsm = AsmSymbols.size();
258 return basic_symbol_iterator(BasicSymbolRef(Ret, this));
261 ErrorOr<MemoryBufferRef> IRObjectFile::findBitcodeInObject(const ObjectFile &Obj) {
262 for (const SectionRef &Sec : Obj.sections()) {
264 if (std::error_code EC = Sec.getName(SecName))
266 if (SecName == ".llvmbc") {
267 StringRef SecContents;
268 if (std::error_code EC = Sec.getContents(SecContents))
270 return MemoryBufferRef(SecContents, Obj.getFileName());
274 return object_error::bitcode_section_not_found;
277 ErrorOr<MemoryBufferRef> IRObjectFile::findBitcodeInMemBuffer(MemoryBufferRef Object) {
278 sys::fs::file_magic Type = sys::fs::identify_magic(Object.getBuffer());
280 case sys::fs::file_magic::bitcode:
282 case sys::fs::file_magic::elf_relocatable:
283 case sys::fs::file_magic::macho_object:
284 case sys::fs::file_magic::coff_object: {
285 ErrorOr<std::unique_ptr<ObjectFile>> ObjFile =
286 ObjectFile::createObjectFile(Object, Type);
288 return ObjFile.getError();
289 return findBitcodeInObject(*ObjFile->get());
292 return object_error::invalid_file_type;
296 ErrorOr<std::unique_ptr<IRObjectFile>>
297 llvm::object::IRObjectFile::create(MemoryBufferRef Object,
298 LLVMContext &Context) {
299 ErrorOr<MemoryBufferRef> BCOrErr = findBitcodeInMemBuffer(Object);
301 return BCOrErr.getError();
303 std::unique_ptr<MemoryBuffer> Buff(
304 MemoryBuffer::getMemBuffer(BCOrErr.get(), false));
306 ErrorOr<Module *> MOrErr = getLazyBitcodeModule(std::move(Buff), Context);
307 if (std::error_code EC = MOrErr.getError())
310 std::unique_ptr<Module> M(MOrErr.get());
311 return llvm::make_unique<IRObjectFile>(Object, std::move(M));