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/COFF.h" 15 #include "llvm/Object/MachO.h" 16 #include "llvm/Object/ObjectFile.h" 17 #include "llvm/Support/ErrorHandling.h" 18 #include "llvm/Support/FileSystem.h" 19 #include "llvm/Support/MemoryBuffer.h" 20 #include "llvm/Support/raw_ostream.h" 21 #include <system_error> 22 23 using namespace llvm; 24 using namespace object; 25 26 void ObjectFile::anchor() { } 27 28 ObjectFile::ObjectFile(unsigned int Type, MemoryBufferRef Source) 29 : SymbolicFile(Type, Source) {} 30 31 std::error_code ObjectFile::printSymbolName(raw_ostream &OS, 32 DataRefImpl Symb) const { 33 StringRef Name; 34 if (std::error_code EC = getSymbolName(Symb, Name)) 35 return EC; 36 OS << Name; 37 return std::error_code(); 38 } 39 40 uint32_t ObjectFile::getSymbolAlignment(DataRefImpl DRI) const { return 0; } 41 42 section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const { 43 return section_iterator(SectionRef(Sec, this)); 44 } 45 46 ErrorOr<std::unique_ptr<ObjectFile>> 47 ObjectFile::createObjectFile(MemoryBufferRef Object, sys::fs::file_magic Type) { 48 StringRef Data = Object.getBuffer(); 49 if (Type == sys::fs::file_magic::unknown) 50 Type = sys::fs::identify_magic(Data); 51 52 switch (Type) { 53 case sys::fs::file_magic::unknown: 54 case sys::fs::file_magic::bitcode: 55 case sys::fs::file_magic::archive: 56 case sys::fs::file_magic::macho_universal_binary: 57 case sys::fs::file_magic::windows_resource: 58 return object_error::invalid_file_type; 59 case sys::fs::file_magic::elf: 60 case sys::fs::file_magic::elf_relocatable: 61 case sys::fs::file_magic::elf_executable: 62 case sys::fs::file_magic::elf_shared_object: 63 case sys::fs::file_magic::elf_core: 64 return createELFObjectFile(Object); 65 case sys::fs::file_magic::macho_object: 66 case sys::fs::file_magic::macho_executable: 67 case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib: 68 case sys::fs::file_magic::macho_core: 69 case sys::fs::file_magic::macho_preload_executable: 70 case sys::fs::file_magic::macho_dynamically_linked_shared_lib: 71 case sys::fs::file_magic::macho_dynamic_linker: 72 case sys::fs::file_magic::macho_bundle: 73 case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub: 74 case sys::fs::file_magic::macho_dsym_companion: 75 case sys::fs::file_magic::macho_kext_bundle: 76 return createMachOObjectFile(Object); 77 case sys::fs::file_magic::coff_object: 78 case sys::fs::file_magic::coff_import_library: 79 case sys::fs::file_magic::pecoff_executable: 80 return createCOFFObjectFile(Object); 81 } 82 llvm_unreachable("Unexpected Object File Type"); 83 } 84 85 ErrorOr<OwningBinary<ObjectFile>> 86 ObjectFile::createObjectFile(StringRef ObjectPath) { 87 ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr = 88 MemoryBuffer::getFile(ObjectPath); 89 if (std::error_code EC = FileOrErr.getError()) 90 return EC; 91 std::unique_ptr<MemoryBuffer> Buffer = std::move(FileOrErr.get()); 92 93 ErrorOr<std::unique_ptr<ObjectFile>> ObjOrErr = 94 createObjectFile(Buffer->getMemBufferRef()); 95 if (std::error_code EC = ObjOrErr.getError()) 96 return EC; 97 std::unique_ptr<ObjectFile> Obj = std::move(ObjOrErr.get()); 98 99 return OwningBinary<ObjectFile>(std::move(Obj), std::move(Buffer)); 100 } 101