ObjectFile.cpp revision 797684279172bd56d08d4cefb76b1a9f9a4aabe6 
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/FileSystem.h"
18#include "llvm/Support/MemoryBuffer.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->getBufferSize() < 64) {
42    delete Object;
43    return 0;
44  }
45
46  sys::fs::file_magic Type = sys::fs::identify_magic(Object->getBuffer());
47  switch (Type) {
48  case sys::fs::file_magic::unknown:
49  case sys::fs::file_magic::bitcode:
50  case sys::fs::file_magic::archive:
51  case sys::fs::file_magic::macho_universal_binary:
52    delete Object;
53    return 0;
54  case sys::fs::file_magic::elf_relocatable:
55  case sys::fs::file_magic::elf_executable:
56  case sys::fs::file_magic::elf_shared_object:
57  case sys::fs::file_magic::elf_core:
58    return createELFObjectFile(Object);
59  case sys::fs::file_magic::macho_object:
60  case sys::fs::file_magic::macho_executable:
61  case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
62  case sys::fs::file_magic::macho_core:
63  case sys::fs::file_magic::macho_preload_executable:
64  case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
65  case sys::fs::file_magic::macho_dynamic_linker:
66  case sys::fs::file_magic::macho_bundle:
67  case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
68  case sys::fs::file_magic::macho_dsym_companion:
69    return createMachOObjectFile(Object);
70  case sys::fs::file_magic::coff_object:
71  case sys::fs::file_magic::pecoff_executable:
72    return createCOFFObjectFile(Object);
73  }
74  llvm_unreachable("Unexpected Object File Type");
75}
76
77ObjectFile *ObjectFile::createObjectFile(StringRef ObjectPath) {
78  OwningPtr<MemoryBuffer> File;
79  if (MemoryBuffer::getFile(ObjectPath, File))
80    return NULL;
81  return createObjectFile(File.take());
82}
83