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 using std::error_code; 24 25 void ObjectFile::anchor() { } 26 27 ObjectFile::ObjectFile(unsigned int Type, MemoryBuffer *Source, 28 bool BufferOwned) 29 : SymbolicFile(Type, Source, BufferOwned) {} 30 31 error_code ObjectFile::printSymbolName(raw_ostream &OS, 32 DataRefImpl Symb) const { 33 StringRef Name; 34 if (error_code EC = getSymbolName(Symb, Name)) 35 return EC; 36 OS << Name; 37 return object_error::success; 38 } 39 40 error_code ObjectFile::getSymbolAlignment(DataRefImpl DRI, 41 uint32_t &Result) const { 42 Result = 0; 43 return object_error::success; 44 } 45 46 section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const { 47 return section_iterator(SectionRef(Sec, this)); 48 } 49 50 ErrorOr<ObjectFile *> ObjectFile::createObjectFile(MemoryBuffer *Object, 51 bool BufferOwned, 52 sys::fs::file_magic Type) { 53 if (Type == sys::fs::file_magic::unknown) 54 Type = sys::fs::identify_magic(Object->getBuffer()); 55 56 switch (Type) { 57 case sys::fs::file_magic::unknown: 58 case sys::fs::file_magic::bitcode: 59 case sys::fs::file_magic::archive: 60 case sys::fs::file_magic::macho_universal_binary: 61 case sys::fs::file_magic::windows_resource: 62 if (BufferOwned) 63 delete Object; 64 return object_error::invalid_file_type; 65 case sys::fs::file_magic::elf_relocatable: 66 case sys::fs::file_magic::elf_executable: 67 case sys::fs::file_magic::elf_shared_object: 68 case sys::fs::file_magic::elf_core: 69 return createELFObjectFile(Object, BufferOwned); 70 case sys::fs::file_magic::macho_object: 71 case sys::fs::file_magic::macho_executable: 72 case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib: 73 case sys::fs::file_magic::macho_core: 74 case sys::fs::file_magic::macho_preload_executable: 75 case sys::fs::file_magic::macho_dynamically_linked_shared_lib: 76 case sys::fs::file_magic::macho_dynamic_linker: 77 case sys::fs::file_magic::macho_bundle: 78 case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub: 79 case sys::fs::file_magic::macho_dsym_companion: 80 return createMachOObjectFile(Object, BufferOwned); 81 case sys::fs::file_magic::coff_object: 82 case sys::fs::file_magic::coff_import_library: 83 case sys::fs::file_magic::pecoff_executable: 84 return createCOFFObjectFile(Object, BufferOwned); 85 } 86 llvm_unreachable("Unexpected Object File Type"); 87 } 88 89 ErrorOr<ObjectFile *> ObjectFile::createObjectFile(StringRef ObjectPath) { 90 std::unique_ptr<MemoryBuffer> File; 91 if (error_code EC = MemoryBuffer::getFile(ObjectPath, File)) 92 return EC; 93 return createObjectFile(File.release()); 94 } 95