contrib/llvm/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 error_code ObjectFile::getSymbolAlignment(DataRefImpl DRI,
  31                                           uint32_t &Result) const {
  32   Result = 0;
  33   return object_error::success;
  34 }
  35
  36 ObjectFile *ObjectFile::createObjectFile(MemoryBuffer *Object) {
  37   if (!Object || Object->getBufferSize() < 64)
  38     return 0;
  39   sys::LLVMFileType type = sys::IdentifyFileType(Object->getBufferStart(),
  40                                 static_cast<unsigned>(Object->getBufferSize()));
  41   switch (type) {
  42     case sys::Unknown_FileType:
  43       return 0;
  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     case sys::Mach_O_DSYMCompanion_FileType:
  59       return createMachOObjectFile(Object);
  60     case sys::COFF_FileType:
  61       return createCOFFObjectFile(Object);
  62     default:
  63       llvm_unreachable("Unexpected Object File Type");
  64   }
  65 }
  66
  67 ObjectFile *ObjectFile::createObjectFile(StringRef ObjectPath) {
  68   OwningPtr<MemoryBuffer> File;
  69   if (MemoryBuffer::getFile(ObjectPath, File))
  70     return NULL;
  71   return createObjectFile(File.take());
  72 }