1 //===- IRObjectFile.cpp - IR object file implementation ---------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // Part of the IRObjectFile class implementation. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "llvm/Object/IRObjectFile.h" 14 #include "llvm/ADT/STLExtras.h" 15 #include "llvm/BinaryFormat/Magic.h" 16 #include "llvm/Bitcode/BitcodeReader.h" 17 #include "llvm/IR/GVMaterializer.h" 18 #include "llvm/IR/LLVMContext.h" 19 #include "llvm/IR/Mangler.h" 20 #include "llvm/IR/Module.h" 21 #include "llvm/Object/ObjectFile.h" 22 #include "llvm/Support/MemoryBuffer.h" 23 #include "llvm/Support/TargetRegistry.h" 24 #include "llvm/Support/raw_ostream.h" 25 using namespace llvm; 26 using namespace object; 27 28 IRObjectFile::IRObjectFile(MemoryBufferRef Object, 29 std::vector<std::unique_ptr<Module>> Mods) 30 : SymbolicFile(Binary::ID_IR, Object), Mods(std::move(Mods)) { 31 for (auto &M : this->Mods) 32 SymTab.addModule(M.get()); 33 } 34 35 IRObjectFile::~IRObjectFile() {} 36 37 static ModuleSymbolTable::Symbol getSym(DataRefImpl &Symb) { 38 return *reinterpret_cast<ModuleSymbolTable::Symbol *>(Symb.p); 39 } 40 41 void IRObjectFile::moveSymbolNext(DataRefImpl &Symb) const { 42 Symb.p += sizeof(ModuleSymbolTable::Symbol); 43 } 44 45 std::error_code IRObjectFile::printSymbolName(raw_ostream &OS, 46 DataRefImpl Symb) const { 47 SymTab.printSymbolName(OS, getSym(Symb)); 48 return std::error_code(); 49 } 50 51 uint32_t IRObjectFile::getSymbolFlags(DataRefImpl Symb) const { 52 return SymTab.getSymbolFlags(getSym(Symb)); 53 } 54 55 basic_symbol_iterator IRObjectFile::symbol_begin() const { 56 DataRefImpl Ret; 57 Ret.p = reinterpret_cast<uintptr_t>(SymTab.symbols().data()); 58 return basic_symbol_iterator(BasicSymbolRef(Ret, this)); 59 } 60 61 basic_symbol_iterator IRObjectFile::symbol_end() const { 62 DataRefImpl Ret; 63 Ret.p = reinterpret_cast<uintptr_t>(SymTab.symbols().data() + 64 SymTab.symbols().size()); 65 return basic_symbol_iterator(BasicSymbolRef(Ret, this)); 66 } 67 68 StringRef IRObjectFile::getTargetTriple() const { 69 // Each module must have the same target triple, so we arbitrarily access the 70 // first one. 71 return Mods[0]->getTargetTriple(); 72 } 73 74 Expected<MemoryBufferRef> 75 IRObjectFile::findBitcodeInObject(const ObjectFile &Obj) { 76 for (const SectionRef &Sec : Obj.sections()) { 77 if (Sec.isBitcode()) { 78 StringRef SecContents; 79 if (std::error_code EC = Sec.getContents(SecContents)) 80 return errorCodeToError(EC); 81 return MemoryBufferRef(SecContents, Obj.getFileName()); 82 } 83 } 84 85 return errorCodeToError(object_error::bitcode_section_not_found); 86 } 87 88 Expected<MemoryBufferRef> 89 IRObjectFile::findBitcodeInMemBuffer(MemoryBufferRef Object) { 90 file_magic Type = identify_magic(Object.getBuffer()); 91 switch (Type) { 92 case file_magic::bitcode: 93 return Object; 94 case file_magic::elf_relocatable: 95 case file_magic::macho_object: 96 case file_magic::coff_object: { 97 Expected<std::unique_ptr<ObjectFile>> ObjFile = 98 ObjectFile::createObjectFile(Object, Type); 99 if (!ObjFile) 100 return ObjFile.takeError(); 101 return findBitcodeInObject(*ObjFile->get()); 102 } 103 default: 104 return errorCodeToError(object_error::invalid_file_type); 105 } 106 } 107 108 Expected<std::unique_ptr<IRObjectFile>> 109 IRObjectFile::create(MemoryBufferRef Object, LLVMContext &Context) { 110 Expected<MemoryBufferRef> BCOrErr = findBitcodeInMemBuffer(Object); 111 if (!BCOrErr) 112 return BCOrErr.takeError(); 113 114 Expected<std::vector<BitcodeModule>> BMsOrErr = 115 getBitcodeModuleList(*BCOrErr); 116 if (!BMsOrErr) 117 return BMsOrErr.takeError(); 118 119 std::vector<std::unique_ptr<Module>> Mods; 120 for (auto BM : *BMsOrErr) { 121 Expected<std::unique_ptr<Module>> MOrErr = 122 BM.getLazyModule(Context, /*ShouldLazyLoadMetadata*/ true, 123 /*IsImporting*/ false); 124 if (!MOrErr) 125 return MOrErr.takeError(); 126 127 Mods.push_back(std::move(*MOrErr)); 128 } 129 130 return std::unique_ptr<IRObjectFile>( 131 new IRObjectFile(*BCOrErr, std::move(Mods))); 132 } 133 134 Expected<IRSymtabFile> object::readIRSymtab(MemoryBufferRef MBRef) { 135 IRSymtabFile F; 136 Expected<MemoryBufferRef> BCOrErr = 137 IRObjectFile::findBitcodeInMemBuffer(MBRef); 138 if (!BCOrErr) 139 return BCOrErr.takeError(); 140 141 Expected<BitcodeFileContents> BFCOrErr = getBitcodeFileContents(*BCOrErr); 142 if (!BFCOrErr) 143 return BFCOrErr.takeError(); 144 145 Expected<irsymtab::FileContents> FCOrErr = irsymtab::readBitcode(*BFCOrErr); 146 if (!FCOrErr) 147 return FCOrErr.takeError(); 148 149 F.Mods = std::move(BFCOrErr->Mods); 150 F.Symtab = std::move(FCOrErr->Symtab); 151 F.Strtab = std::move(FCOrErr->Strtab); 152 F.TheReader = std::move(FCOrErr->TheReader); 153 return std::move(F); 154 } 155