ObjectFile.cpp revision f12745f7a7e68c05c89ebd515b9b4faedce37dd0 
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
21using namespace llvm;
22using namespace object;
23
24void ObjectFile::anchor() { }
25
26ObjectFile::ObjectFile(unsigned int Type, MemoryBuffer *source)
27  : Binary(Type, source) {
28}
29
30error_code ObjectFile::getSymbolAlignment(DataRefImpl DRI,
31                                          uint32_t &Result) const {
32  Result = 0;
33  return object_error::success;
34}
35
36section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const {
37  return section_iterator(SectionRef(Sec, this));
38}
39
40ObjectFile *ObjectFile::createObjectFile(MemoryBuffer *Object) {
41  if (!Object || Object->getBufferSize() < 64)
42    return 0;
43  sys::LLVMFileType type = sys::identifyFileType(Object->getBuffer());
44  switch (type) {
45    case sys::Unknown_FileType:
46      return 0;
47    case sys::ELF_Relocatable_FileType:
48    case sys::ELF_Executable_FileType:
49    case sys::ELF_SharedObject_FileType:
50    case sys::ELF_Core_FileType:
51      return createELFObjectFile(Object);
52    case sys::Mach_O_Object_FileType:
53    case sys::Mach_O_Executable_FileType:
54    case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
55    case sys::Mach_O_Core_FileType:
56    case sys::Mach_O_PreloadExecutable_FileType:
57    case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
58    case sys::Mach_O_DynamicLinker_FileType:
59    case sys::Mach_O_Bundle_FileType:
60    case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
61    case sys::Mach_O_DSYMCompanion_FileType:
62      return createMachOObjectFile(Object);
63    case sys::COFF_FileType:
64      return createCOFFObjectFile(Object);
65    default:
66      llvm_unreachable("Unexpected Object File Type");
67  }
68}
69
70ObjectFile *ObjectFile::createObjectFile(StringRef ObjectPath) {
71  OwningPtr<MemoryBuffer> File;
72  if (MemoryBuffer::getFile(ObjectPath, File))
73    return NULL;
74  return createObjectFile(File.take());
75}
76