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/MCParser/MCTargetAsmParser.h"
28 #include "llvm/MC/MCRegisterInfo.h"
29 #include "llvm/MC/MCSubtargetInfo.h"
30 #include "llvm/Object/ObjectFile.h"
31 #include "llvm/Support/MemoryBuffer.h"
32 #include "llvm/Support/SourceMgr.h"
33 #include "llvm/Support/TargetRegistry.h"
34 #include "llvm/Support/raw_ostream.h"
36 using namespace object;
38 IRObjectFile::IRObjectFile(MemoryBufferRef Object, std::unique_ptr<Module> Mod)
39 : SymbolicFile(Binary::ID_IR, Object), M(std::move(Mod)) {
40 Mang.reset(new Mangler());
41 CollectAsmUndefinedRefs(Triple(M->getTargetTriple()), M->getModuleInlineAsm(),
42 [this](StringRef Name, BasicSymbolRef::Flags Flags) {
43 AsmSymbols.emplace_back(Name, std::move(Flags));
47 // Parse inline ASM and collect the list of symbols that are not defined in
48 // the current module. This is inspired from IRObjectFile.
49 void IRObjectFile::CollectAsmUndefinedRefs(
50 const Triple &TT, StringRef InlineAsm,
51 function_ref<void(StringRef, BasicSymbolRef::Flags)> AsmUndefinedRefs) {
52 if (InlineAsm.empty())
56 const Target *T = TargetRegistry::lookupTarget(TT.str(), Err);
60 std::unique_ptr<MCRegisterInfo> MRI(T->createMCRegInfo(TT.str()));
64 std::unique_ptr<MCAsmInfo> MAI(T->createMCAsmInfo(*MRI, TT.str()));
68 std::unique_ptr<MCSubtargetInfo> STI(
69 T->createMCSubtargetInfo(TT.str(), "", ""));
73 std::unique_ptr<MCInstrInfo> MCII(T->createMCInstrInfo());
77 MCObjectFileInfo MOFI;
78 MCContext MCCtx(MAI.get(), MRI.get(), &MOFI);
79 MOFI.InitMCObjectFileInfo(TT, /*PIC*/ false, CodeModel::Default, MCCtx);
80 std::unique_ptr<RecordStreamer> Streamer(new RecordStreamer(MCCtx));
81 T->createNullTargetStreamer(*Streamer);
83 std::unique_ptr<MemoryBuffer> Buffer(MemoryBuffer::getMemBuffer(InlineAsm));
85 SrcMgr.AddNewSourceBuffer(std::move(Buffer), SMLoc());
86 std::unique_ptr<MCAsmParser> Parser(
87 createMCAsmParser(SrcMgr, MCCtx, *Streamer, *MAI));
89 MCTargetOptions MCOptions;
90 std::unique_ptr<MCTargetAsmParser> TAP(
91 T->createMCAsmParser(*STI, *Parser, *MCII, MCOptions));
95 Parser->setTargetParser(*TAP);
96 if (Parser->Run(false))
99 for (auto &KV : *Streamer) {
100 StringRef Key = KV.first();
101 RecordStreamer::State Value = KV.second;
102 uint32_t Res = BasicSymbolRef::SF_None;
104 case RecordStreamer::NeverSeen:
105 llvm_unreachable("foo");
106 case RecordStreamer::DefinedGlobal:
107 Res |= BasicSymbolRef::SF_Global;
109 case RecordStreamer::Defined:
111 case RecordStreamer::Global:
112 case RecordStreamer::Used:
113 Res |= BasicSymbolRef::SF_Undefined;
114 Res |= BasicSymbolRef::SF_Global;
116 case RecordStreamer::GlobalWeak:
117 Res |= BasicSymbolRef::SF_Weak;
118 Res |= BasicSymbolRef::SF_Global;
121 AsmUndefinedRefs(Key, BasicSymbolRef::Flags(Res));
125 IRObjectFile::~IRObjectFile() {
128 static GlobalValue *getGV(DataRefImpl &Symb) {
129 if ((Symb.p & 3) == 3)
132 return reinterpret_cast<GlobalValue*>(Symb.p & ~uintptr_t(3));
135 static uintptr_t skipEmpty(Module::const_alias_iterator I, const Module &M) {
136 if (I == M.alias_end())
138 const GlobalValue *GV = &*I;
139 return reinterpret_cast<uintptr_t>(GV) | 2;
142 static uintptr_t skipEmpty(Module::const_global_iterator I, const Module &M) {
143 if (I == M.global_end())
144 return skipEmpty(M.alias_begin(), M);
145 const GlobalValue *GV = &*I;
146 return reinterpret_cast<uintptr_t>(GV) | 1;
149 static uintptr_t skipEmpty(Module::const_iterator I, const Module &M) {
151 return skipEmpty(M.global_begin(), M);
152 const GlobalValue *GV = &*I;
153 return reinterpret_cast<uintptr_t>(GV) | 0;
156 static unsigned getAsmSymIndex(DataRefImpl Symb) {
157 assert((Symb.p & uintptr_t(3)) == 3);
158 uintptr_t Index = Symb.p & ~uintptr_t(3);
163 void IRObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
164 const GlobalValue *GV = getGV(Symb);
167 switch (Symb.p & 3) {
169 Module::const_iterator Iter(static_cast<const Function*>(GV));
171 Res = skipEmpty(Iter, *M);
175 Module::const_global_iterator Iter(static_cast<const GlobalVariable*>(GV));
177 Res = skipEmpty(Iter, *M);
181 Module::const_alias_iterator Iter(static_cast<const GlobalAlias*>(GV));
183 Res = skipEmpty(Iter, *M);
187 unsigned Index = getAsmSymIndex(Symb);
188 assert(Index < AsmSymbols.size());
190 Res = (Index << 2) | 3;
194 llvm_unreachable("unreachable case");
200 std::error_code IRObjectFile::printSymbolName(raw_ostream &OS,
201 DataRefImpl Symb) const {
202 const GlobalValue *GV = getGV(Symb);
204 unsigned Index = getAsmSymIndex(Symb);
205 assert(Index <= AsmSymbols.size());
206 OS << AsmSymbols[Index].first;
207 return std::error_code();
210 if (GV->hasDLLImportStorageClass())
214 Mang->getNameWithPrefix(OS, GV, false);
218 return std::error_code();
221 uint32_t IRObjectFile::getSymbolFlags(DataRefImpl Symb) const {
222 const GlobalValue *GV = getGV(Symb);
225 unsigned Index = getAsmSymIndex(Symb);
226 assert(Index <= AsmSymbols.size());
227 return AsmSymbols[Index].second;
230 uint32_t Res = BasicSymbolRef::SF_None;
231 if (GV->isDeclarationForLinker())
232 Res |= BasicSymbolRef::SF_Undefined;
233 else if (GV->hasHiddenVisibility() && !GV->hasLocalLinkage())
234 Res |= BasicSymbolRef::SF_Hidden;
235 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV)) {
236 if (GVar->isConstant())
237 Res |= BasicSymbolRef::SF_Const;
239 if (GV->hasPrivateLinkage())
240 Res |= BasicSymbolRef::SF_FormatSpecific;
241 if (!GV->hasLocalLinkage())
242 Res |= BasicSymbolRef::SF_Global;
243 if (GV->hasCommonLinkage())
244 Res |= BasicSymbolRef::SF_Common;
245 if (GV->hasLinkOnceLinkage() || GV->hasWeakLinkage() ||
246 GV->hasExternalWeakLinkage())
247 Res |= BasicSymbolRef::SF_Weak;
249 if (GV->getName().startswith("llvm."))
250 Res |= BasicSymbolRef::SF_FormatSpecific;
251 else if (auto *Var = dyn_cast<GlobalVariable>(GV)) {
252 if (Var->getSection() == "llvm.metadata")
253 Res |= BasicSymbolRef::SF_FormatSpecific;
259 GlobalValue *IRObjectFile::getSymbolGV(DataRefImpl Symb) { return getGV(Symb); }
261 std::unique_ptr<Module> IRObjectFile::takeModule() { return std::move(M); }
263 basic_symbol_iterator IRObjectFile::symbol_begin_impl() const {
264 Module::const_iterator I = M->begin();
266 Ret.p = skipEmpty(I, *M);
267 return basic_symbol_iterator(BasicSymbolRef(Ret, this));
270 basic_symbol_iterator IRObjectFile::symbol_end_impl() const {
272 uint64_t NumAsm = AsmSymbols.size();
275 return basic_symbol_iterator(BasicSymbolRef(Ret, this));
278 ErrorOr<MemoryBufferRef> IRObjectFile::findBitcodeInObject(const ObjectFile &Obj) {
279 for (const SectionRef &Sec : Obj.sections()) {
280 if (Sec.isBitcode()) {
281 StringRef SecContents;
282 if (std::error_code EC = Sec.getContents(SecContents))
284 return MemoryBufferRef(SecContents, Obj.getFileName());
288 return object_error::bitcode_section_not_found;
291 ErrorOr<MemoryBufferRef> IRObjectFile::findBitcodeInMemBuffer(MemoryBufferRef Object) {
292 sys::fs::file_magic Type = sys::fs::identify_magic(Object.getBuffer());
294 case sys::fs::file_magic::bitcode:
296 case sys::fs::file_magic::elf_relocatable:
297 case sys::fs::file_magic::macho_object:
298 case sys::fs::file_magic::coff_object: {
299 Expected<std::unique_ptr<ObjectFile>> ObjFile =
300 ObjectFile::createObjectFile(Object, Type);
302 return errorToErrorCode(ObjFile.takeError());
303 return findBitcodeInObject(*ObjFile->get());
306 return object_error::invalid_file_type;
310 ErrorOr<std::unique_ptr<IRObjectFile>>
311 llvm::object::IRObjectFile::create(MemoryBufferRef Object,
312 LLVMContext &Context) {
313 ErrorOr<MemoryBufferRef> BCOrErr = findBitcodeInMemBuffer(Object);
315 return BCOrErr.getError();
317 std::unique_ptr<MemoryBuffer> Buff =
318 MemoryBuffer::getMemBuffer(BCOrErr.get(), false);
320 ErrorOr<std::unique_ptr<Module>> MOrErr =
321 getLazyBitcodeModule(std::move(Buff), Context,
322 /*ShouldLazyLoadMetadata*/ true);
323 if (std::error_code EC = MOrErr.getError())
326 std::unique_ptr<Module> &M = MOrErr.get();
327 return llvm::make_unique<IRObjectFile>(Object, std::move(M));