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/ADT/OwningPtr.h" 16 #include "llvm/Support/ErrorHandling.h" 17 #include "llvm/Support/FileSystem.h" 18 #include "llvm/Support/MemoryBuffer.h" 19 #include "llvm/Support/system_error.h" 20 21 using namespace llvm; 22 using namespace object; 23 24 void ObjectFile::anchor() { } 25 26 ObjectFile::ObjectFile(unsigned int Type, MemoryBuffer *source) 27 : Binary(Type, source) { 28 } 29 30 error_code ObjectFile::getSymbolAlignment(DataRefImpl DRI, 31 uint32_t &Result) const { 32 Result = 0; 33 return object_error::success; 34 } 35 36 section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const { 37 return section_iterator(SectionRef(Sec, this)); 38 } 39 40 ObjectFile *ObjectFile::createObjectFile(MemoryBuffer *Object) { 41 if (Object->getBufferSize() < 64) { 42 delete Object; 43 return 0; 44 } 45 46 sys::fs::file_magic Type = sys::fs::identify_magic(Object->getBuffer()); 47 switch (Type) { 48 case sys::fs::file_magic::unknown: 49 case sys::fs::file_magic::bitcode: 50 case sys::fs::file_magic::archive: 51 case sys::fs::file_magic::macho_universal_binary: 52 delete Object; 53 return 0; 54 case sys::fs::file_magic::elf_relocatable: 55 case sys::fs::file_magic::elf_executable: 56 case sys::fs::file_magic::elf_shared_object: 57 case sys::fs::file_magic::elf_core: 58 return createELFObjectFile(Object); 59 case sys::fs::file_magic::macho_object: 60 case sys::fs::file_magic::macho_executable: 61 case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib: 62 case sys::fs::file_magic::macho_core: 63 case sys::fs::file_magic::macho_preload_executable: 64 case sys::fs::file_magic::macho_dynamically_linked_shared_lib: 65 case sys::fs::file_magic::macho_dynamic_linker: 66 case sys::fs::file_magic::macho_bundle: 67 case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub: 68 case sys::fs::file_magic::macho_dsym_companion: 69 return createMachOObjectFile(Object); 70 case sys::fs::file_magic::coff_object: 71 case sys::fs::file_magic::pecoff_executable: 72 return createCOFFObjectFile(Object); 73 } 74 llvm_unreachable("Unexpected Object File Type"); 75 } 76 77 ObjectFile *ObjectFile::createObjectFile(StringRef ObjectPath) { 78 OwningPtr<MemoryBuffer> File; 79 if (MemoryBuffer::getFile(ObjectPath, File)) 80 return NULL; 81 return createObjectFile(File.take()); 82 } 83
