1 //===- ObjectFile.cpp - File format independent object file ---------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file defines a file format independent ObjectFile class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/ADT/StringRef.h" 15 #include "llvm/Object/Binary.h" 16 #include "llvm/Object/COFF.h" 17 #include "llvm/Object/Error.h" 18 #include "llvm/Object/MachO.h" 19 #include "llvm/Object/ObjectFile.h" 20 #include "llvm/Object/Wasm.h" 21 #include "llvm/Support/Error.h" 22 #include "llvm/Support/ErrorHandling.h" 23 #include "llvm/Support/ErrorOr.h" 24 #include "llvm/Support/FileSystem.h" 25 #include "llvm/Support/MemoryBuffer.h" 26 #include "llvm/Support/raw_ostream.h" 27 #include <algorithm> 28 #include <cstdint> 29 #include <memory> 30 #include <system_error> 31 32 using namespace llvm; 33 using namespace object; 34 35 void ObjectFile::anchor() {} 36 37 ObjectFile::ObjectFile(unsigned int Type, MemoryBufferRef Source) 38 : SymbolicFile(Type, Source) {} 39 40 bool SectionRef::containsSymbol(SymbolRef S) const { 41 Expected<section_iterator> SymSec = S.getSection(); 42 if (!SymSec) { 43 // TODO: Actually report errors helpfully. 44 consumeError(SymSec.takeError()); 45 return false; 46 } 47 return *this == **SymSec; 48 } 49 50 uint64_t ObjectFile::getSymbolValue(DataRefImpl Ref) const { 51 uint32_t Flags = getSymbolFlags(Ref); 52 if (Flags & SymbolRef::SF_Undefined) 53 return 0; 54 if (Flags & SymbolRef::SF_Common) 55 return getCommonSymbolSize(Ref); 56 return getSymbolValueImpl(Ref); 57 } 58 59 std::error_code ObjectFile::printSymbolName(raw_ostream &OS, 60 DataRefImpl Symb) const { 61 Expected<StringRef> Name = getSymbolName(Symb); 62 if (!Name) 63 return errorToErrorCode(Name.takeError()); 64 OS << *Name; 65 return std::error_code(); 66 } 67 68 uint32_t ObjectFile::getSymbolAlignment(DataRefImpl DRI) const { return 0; } 69 70 bool ObjectFile::isSectionBitcode(DataRefImpl Sec) const { 71 StringRef SectName; 72 if (!getSectionName(Sec, SectName)) 73 return SectName == ".llvmbc"; 74 return false; 75 } 76 77 section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const { 78 return section_iterator(SectionRef(Sec, this)); 79 } 80 81 Expected<std::unique_ptr<ObjectFile>> 82 ObjectFile::createObjectFile(MemoryBufferRef Object, sys::fs::file_magic Type) { 83 StringRef Data = Object.getBuffer(); 84 if (Type == sys::fs::file_magic::unknown) 85 Type = sys::fs::identify_magic(Data); 86 87 switch (Type) { 88 case sys::fs::file_magic::unknown: 89 case sys::fs::file_magic::bitcode: 90 case sys::fs::file_magic::coff_cl_gl_object: 91 case sys::fs::file_magic::archive: 92 case sys::fs::file_magic::macho_universal_binary: 93 case sys::fs::file_magic::windows_resource: 94 return errorCodeToError(object_error::invalid_file_type); 95 case sys::fs::file_magic::elf: 96 case sys::fs::file_magic::elf_relocatable: 97 case sys::fs::file_magic::elf_executable: 98 case sys::fs::file_magic::elf_shared_object: 99 case sys::fs::file_magic::elf_core: 100 return errorOrToExpected(createELFObjectFile(Object)); 101 case sys::fs::file_magic::macho_object: 102 case sys::fs::file_magic::macho_executable: 103 case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib: 104 case sys::fs::file_magic::macho_core: 105 case sys::fs::file_magic::macho_preload_executable: 106 case sys::fs::file_magic::macho_dynamically_linked_shared_lib: 107 case sys::fs::file_magic::macho_dynamic_linker: 108 case sys::fs::file_magic::macho_bundle: 109 case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub: 110 case sys::fs::file_magic::macho_dsym_companion: 111 case sys::fs::file_magic::macho_kext_bundle: 112 return createMachOObjectFile(Object); 113 case sys::fs::file_magic::coff_object: 114 case sys::fs::file_magic::coff_import_library: 115 case sys::fs::file_magic::pecoff_executable: 116 return errorOrToExpected(createCOFFObjectFile(Object)); 117 case sys::fs::file_magic::wasm_object: 118 return createWasmObjectFile(Object); 119 } 120 llvm_unreachable("Unexpected Object File Type"); 121 } 122 123 Expected<OwningBinary<ObjectFile>> 124 ObjectFile::createObjectFile(StringRef ObjectPath) { 125 ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr = 126 MemoryBuffer::getFile(ObjectPath); 127 if (std::error_code EC = FileOrErr.getError()) 128 return errorCodeToError(EC); 129 std::unique_ptr<MemoryBuffer> Buffer = std::move(FileOrErr.get()); 130 131 Expected<std::unique_ptr<ObjectFile>> ObjOrErr = 132 createObjectFile(Buffer->getMemBufferRef()); 133 if (Error Err = ObjOrErr.takeError()) 134 return std::move(Err); 135 std::unique_ptr<ObjectFile> Obj = std::move(ObjOrErr.get()); 136 137 return OwningBinary<ObjectFile>(std::move(Obj), std::move(Buffer)); 138 } 139