lib/Object/ObjectFile.cpp

   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/MemoryBuffer.h"
  17 #include "llvm/Support/Path.h"
  18 #include "llvm/Support/system_error.h"
  19
  20 using namespace llvm;
  21 using namespace object;
  22
  23 ObjectFile::ObjectFile(MemoryBuffer *Object)
  24   : MapFile(Object) {
  25   assert(MapFile && "Must be a valid MemoryBuffer!");
  26   base = reinterpret_cast<const uint8_t *>(MapFile->getBufferStart());
  27 }
  28
  29 ObjectFile::~ObjectFile() {
  30   delete MapFile;
  31 }
  32
  33 StringRef ObjectFile::getFilename() const {
  34   return MapFile->getBufferIdentifier();
  35 }
  36
  37 ObjectFile *ObjectFile::createObjectFile(MemoryBuffer *Object) {
  38   if (!Object || Object->getBufferSize() < 64)
  39     return 0;
  40   sys::LLVMFileType type = sys::IdentifyFileType(Object->getBufferStart(),
  41                                 static_cast<unsigned>(Object->getBufferSize()));
  42   switch (type) {
  43     case sys::ELF_Relocatable_FileType:
  44     case sys::ELF_Executable_FileType:
  45     case sys::ELF_SharedObject_FileType:
  46     case sys::ELF_Core_FileType:
  47         return 0;
  48     case sys::Mach_O_Object_FileType:
  49     case sys::Mach_O_Executable_FileType:
  50     case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
  51     case sys::Mach_O_Core_FileType:
  52     case sys::Mach_O_PreloadExecutable_FileType:
  53     case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
  54     case sys::Mach_O_DynamicLinker_FileType:
  55     case sys::Mach_O_Bundle_FileType:
  56     case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
  57       return 0;
  58     case sys::COFF_FileType:
  59       return 0;
  60     default:
  61       llvm_unreachable("Unknown Object File Type");
  62   }
  63 }
  64
  65 ObjectFile *ObjectFile::createObjectFile(StringRef ObjectPath) {
  66   error_code ec;
  67   return createObjectFile(MemoryBuffer::getFile(ObjectPath, ec));
  68 }