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