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/MemoryBuffer.h" 18 #include "llvm/Support/Path.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 || Object->getBufferSize() < 64) 42 return 0; 43 sys::LLVMFileType type = sys::IdentifyFileType(Object->getBufferStart(), 44 static_cast<unsigned>(Object->getBufferSize())); 45 switch (type) { 46 case sys::Unknown_FileType: 47 return 0; 48 case sys::ELF_Relocatable_FileType: 49 case sys::ELF_Executable_FileType: 50 case sys::ELF_SharedObject_FileType: 51 case sys::ELF_Core_FileType: 52 return createELFObjectFile(Object); 53 case sys::Mach_O_Object_FileType: 54 case sys::Mach_O_Executable_FileType: 55 case sys::Mach_O_FixedVirtualMemorySharedLib_FileType: 56 case sys::Mach_O_Core_FileType: 57 case sys::Mach_O_PreloadExecutable_FileType: 58 case sys::Mach_O_DynamicallyLinkedSharedLib_FileType: 59 case sys::Mach_O_DynamicLinker_FileType: 60 case sys::Mach_O_Bundle_FileType: 61 case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType: 62 case sys::Mach_O_DSYMCompanion_FileType: 63 return createMachOObjectFile(Object); 64 case sys::COFF_FileType: 65 return createCOFFObjectFile(Object); 66 default: 67 llvm_unreachable("Unexpected Object File Type"); 68 } 69 } 70 71 ObjectFile *ObjectFile::createObjectFile(StringRef ObjectPath) { 72 OwningPtr<MemoryBuffer> File; 73 if (MemoryBuffer::getFile(ObjectPath, File)) 74 return NULL; 75 return createObjectFile(File.take()); 76 } 77