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/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 ObjectFile::ObjectFile(MemoryBuffer *Object)
  25   : MapFile(Object) {
  26   assert(MapFile && "Must be a valid MemoryBuffer!");
  27   base = reinterpret_cast<const uint8_t *>(MapFile->getBufferStart());
  28 }
  29
  30 ObjectFile::~ObjectFile() {
  31   delete MapFile;
  32 }
  33
  34 StringRef ObjectFile::getFilename() const {
  35   return MapFile->getBufferIdentifier();
  36 }
  37
  38 ObjectFile *ObjectFile::createObjectFile(MemoryBuffer *Object) {
  39   if (!Object || Object->getBufferSize() < 64)
  40     return 0;
  41   sys::LLVMFileType type = sys::IdentifyFileType(Object->getBufferStart(),
  42                                 static_cast<unsigned>(Object->getBufferSize()));
  43   switch (type) {
  44     case sys::ELF_Relocatable_FileType:
  45     case sys::ELF_Executable_FileType:
  46     case sys::ELF_SharedObject_FileType:
  47     case sys::ELF_Core_FileType:
  48       return createELFObjectFile(Object);
  49     case sys::Mach_O_Object_FileType:
  50     case sys::Mach_O_Executable_FileType:
  51     case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
  52     case sys::Mach_O_Core_FileType:
  53     case sys::Mach_O_PreloadExecutable_FileType:
  54     case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
  55     case sys::Mach_O_DynamicLinker_FileType:
  56     case sys::Mach_O_Bundle_FileType:
  57     case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
  58       return 0;
  59     case sys::COFF_FileType:
  60       return createCOFFObjectFile(Object);
  61     default:
  62       llvm_unreachable("Unknown Object File Type");
  63   }
  64 }
  65
  66 ObjectFile *ObjectFile::createObjectFile(StringRef ObjectPath) {
  67   OwningPtr<MemoryBuffer> File;
  68   if (error_code ec = MemoryBuffer::getFile(ObjectPath, File))
  69     return NULL;
  70   return createObjectFile(File.take());
  71 }