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