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 void ObjectFile::anchor() { }
  25
  26 ObjectFile::ObjectFile(unsigned int Type, MemoryBuffer *source)
  27   : Binary(Type, source) {
  28 }
  29
  30 ObjectFile *ObjectFile::createObjectFile(MemoryBuffer *Object) {
  31   if (!Object || Object->getBufferSize() < 64)
  32     return 0;
  33   sys::LLVMFileType type = sys::IdentifyFileType(Object->getBufferStart(),
  34                                 static_cast<unsigned>(Object->getBufferSize()));
  35   switch (type) {
  36     case sys::Unknown_FileType:
  37       return 0;
  38     case sys::ELF_Relocatable_FileType:
  39     case sys::ELF_Executable_FileType:
  40     case sys::ELF_SharedObject_FileType:
  41     case sys::ELF_Core_FileType:
  42       return createELFObjectFile(Object);
  43     case sys::Mach_O_Object_FileType:
  44     case sys::Mach_O_Executable_FileType:
  45     case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
  46     case sys::Mach_O_Core_FileType:
  47     case sys::Mach_O_PreloadExecutable_FileType:
  48     case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
  49     case sys::Mach_O_DynamicLinker_FileType:
  50     case sys::Mach_O_Bundle_FileType:
  51     case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
  52     case sys::Mach_O_DSYMCompanion_FileType:
  53       return createMachOObjectFile(Object);
  54     case sys::COFF_FileType:
  55       return createCOFFObjectFile(Object);
  56     default:
  57       llvm_unreachable("Unexpected Object File Type");
  58   }
  59 }
  60
  61 ObjectFile *ObjectFile::createObjectFile(StringRef ObjectPath) {
  62   OwningPtr<MemoryBuffer> File;
  63   if (MemoryBuffer::getFile(ObjectPath, File))
  64     return NULL;
  65   return createObjectFile(File.take());
  66 }