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/Support/ErrorHandling.h" 16 #include "llvm/Support/FileSystem.h" 17 #include "llvm/Support/MemoryBuffer.h" 18 #include "llvm/Support/raw_ostream.h" 19 #include <system_error> 20 21 using namespace llvm; 22 using namespace object; 23 24 void ObjectFile::anchor() { } 25 26 ObjectFile::ObjectFile(unsigned int Type, MemoryBuffer *Source) 27 : SymbolicFile(Type, Source) {} 28 29 std::error_code ObjectFile::printSymbolName(raw_ostream &OS, 30 DataRefImpl Symb) const { 31 StringRef Name; 32 if (std::error_code EC = getSymbolName(Symb, Name)) 33 return EC; 34 OS << Name; 35 return object_error::success; 36 } 37 38 std::error_code ObjectFile::getSymbolAlignment(DataRefImpl DRI, 39 uint32_t &Result) const { 40 Result = 0; 41 return object_error::success; 42 } 43 44 section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const { 45 return section_iterator(SectionRef(Sec, this)); 46 } 47 48 ErrorOr<ObjectFile *> ObjectFile::createObjectFile(MemoryBuffer *Object, 49 sys::fs::file_magic Type) { 50 if (Type == sys::fs::file_magic::unknown) 51 Type = sys::fs::identify_magic(Object->getBuffer()); 52 53 switch (Type) { 54 case sys::fs::file_magic::unknown: 55 case sys::fs::file_magic::bitcode: 56 case sys::fs::file_magic::archive: 57 case sys::fs::file_magic::macho_universal_binary: 58 case sys::fs::file_magic::windows_resource: 59 return object_error::invalid_file_type; 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 return createMachOObjectFile(Object); 76 case sys::fs::file_magic::coff_object: 77 case sys::fs::file_magic::coff_import_library: 78 case sys::fs::file_magic::pecoff_executable: 79 return createCOFFObjectFile(Object); 80 } 81 llvm_unreachable("Unexpected Object File Type"); 82 } 83 84 ErrorOr<ObjectFile *> ObjectFile::createObjectFile(StringRef ObjectPath) { 85 std::unique_ptr<MemoryBuffer> File; 86 if (std::error_code EC = MemoryBuffer::getFile(ObjectPath, File)) 87 return EC; 88 return createObjectFile(File.release()); 89 } 90