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/ArrayRef.h" 15 #include "llvm/BinaryFormat/Magic.h" 16 #include "llvm/Bitcode/BitcodeReader.h" 17 #include "llvm/IR/Module.h" 18 #include "llvm/Object/ObjectFile.h" 19 using namespace llvm; 20 using namespace object; 21 22 namespace llvm { 23 class LLVMContext; 24 class raw_ostream; 25 } // namespace llvm 26 27 IRObjectFile::IRObjectFile(MemoryBufferRef Object, 28 std::vector<std::unique_ptr<Module>> Mods) 29 : SymbolicFile(Binary::ID_IR, Object), Mods(std::move(Mods)) { 30 for (auto &M : this->Mods) 31 SymTab.addModule(M.get()); 32 } 33 34 IRObjectFile::~IRObjectFile() = default; 35 36 static ModuleSymbolTable::Symbol getSym(DataRefImpl &Symb) { 37 return *reinterpret_cast<ModuleSymbolTable::Symbol *>(Symb.p); 38 } 39 40 void IRObjectFile::moveSymbolNext(DataRefImpl &Symb) const { 41 Symb.p += sizeof(ModuleSymbolTable::Symbol); 42 } 43 44 Error IRObjectFile::printSymbolName(raw_ostream &OS, DataRefImpl Symb) const { 45 SymTab.printSymbolName(OS, getSym(Symb)); 46 return Error::success(); 47 } 48 49 Expected<uint32_t> IRObjectFile::getSymbolFlags(DataRefImpl Symb) const { 50 return SymTab.getSymbolFlags(getSym(Symb)); 51 } 52 53 basic_symbol_iterator IRObjectFile::symbol_begin() const { 54 DataRefImpl Ret; 55 Ret.p = reinterpret_cast<uintptr_t>(SymTab.symbols().data()); 56 return basic_symbol_iterator(BasicSymbolRef(Ret, this)); 57 } 58 59 basic_symbol_iterator IRObjectFile::symbol_end() const { 60 DataRefImpl Ret; 61 Ret.p = reinterpret_cast<uintptr_t>(SymTab.symbols().data() + 62 SymTab.symbols().size()); 63 return basic_symbol_iterator(BasicSymbolRef(Ret, this)); 64 } 65 66 StringRef IRObjectFile::getTargetTriple() const { 67 // Each module must have the same target triple, so we arbitrarily access the 68 // first one. 69 return Mods[0]->getTargetTriple(); 70 } 71 72 Expected<MemoryBufferRef> 73 IRObjectFile::findBitcodeInObject(const ObjectFile &Obj) { 74 for (const SectionRef &Sec : Obj.sections()) { 75 if (Sec.isBitcode()) { 76 Expected<StringRef> Contents = Sec.getContents(); 77 if (!Contents) 78 return Contents.takeError(); 79 if (Contents->size() <= 1) 80 return errorCodeToError(object_error::bitcode_section_not_found); 81 return MemoryBufferRef(*Contents, 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::wasm_object: 97 case file_magic::coff_object: { 98 Expected<std::unique_ptr<ObjectFile>> ObjFile = 99 ObjectFile::createObjectFile(Object, Type); 100 if (!ObjFile) 101 return ObjFile.takeError(); 102 return findBitcodeInObject(*ObjFile->get()); 103 } 104 default: 105 return errorCodeToError(object_error::invalid_file_type); 106 } 107 } 108 109 Expected<std::unique_ptr<IRObjectFile>> 110 IRObjectFile::create(MemoryBufferRef Object, LLVMContext &Context) { 111 Expected<MemoryBufferRef> BCOrErr = findBitcodeInMemBuffer(Object); 112 if (!BCOrErr) 113 return BCOrErr.takeError(); 114 115 Expected<std::vector<BitcodeModule>> BMsOrErr = 116 getBitcodeModuleList(*BCOrErr); 117 if (!BMsOrErr) 118 return BMsOrErr.takeError(); 119 120 std::vector<std::unique_ptr<Module>> Mods; 121 for (auto BM : *BMsOrErr) { 122 Expected<std::unique_ptr<Module>> MOrErr = 123 BM.getLazyModule(Context, /*ShouldLazyLoadMetadata*/ true, 124 /*IsImporting*/ false); 125 if (!MOrErr) 126 return MOrErr.takeError(); 127 128 Mods.push_back(std::move(*MOrErr)); 129 } 130 131 return std::unique_ptr<IRObjectFile>( 132 new IRObjectFile(*BCOrErr, std::move(Mods))); 133 } 134 135 Expected<IRSymtabFile> object::readIRSymtab(MemoryBufferRef MBRef) { 136 IRSymtabFile F; 137 Expected<MemoryBufferRef> BCOrErr = 138 IRObjectFile::findBitcodeInMemBuffer(MBRef); 139 if (!BCOrErr) 140 return BCOrErr.takeError(); 141 142 Expected<BitcodeFileContents> BFCOrErr = getBitcodeFileContents(*BCOrErr); 143 if (!BFCOrErr) 144 return BFCOrErr.takeError(); 145 146 Expected<irsymtab::FileContents> FCOrErr = irsymtab::readBitcode(*BFCOrErr); 147 if (!FCOrErr) 148 return FCOrErr.takeError(); 149 150 F.Mods = std::move(BFCOrErr->Mods); 151 F.Symtab = std::move(FCOrErr->Symtab); 152 F.Strtab = std::move(FCOrErr->Strtab); 153 F.TheReader = std::move(FCOrErr->TheReader); 154 return std::move(F); 155 } 156