ObjectFile.cpp revision 36b56886974eae4f9c5ebc96befd3e7bfe5de338 
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/Support/ErrorHandling.h"
16#include "llvm/Support/FileSystem.h"
17#include "llvm/Support/MemoryBuffer.h"
18#include "llvm/Support/raw_ostream.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                       bool BufferOwned)
28    : SymbolicFile(Type, Source, BufferOwned) {}
29
30error_code ObjectFile::printSymbolName(raw_ostream &OS,
31                                       DataRefImpl Symb) const {
32  StringRef Name;
33  if (error_code EC = getSymbolName(Symb, Name))
34    return EC;
35  OS << Name;
36  return object_error::success;
37}
38
39error_code ObjectFile::getSymbolAlignment(DataRefImpl DRI,
40                                          uint32_t &Result) const {
41  Result = 0;
42  return object_error::success;
43}
44
45section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const {
46  return section_iterator(SectionRef(Sec, this));
47}
48
49ErrorOr<ObjectFile *> ObjectFile::createObjectFile(MemoryBuffer *Object,
50                                                   bool BufferOwned,
51                                                   sys::fs::file_magic Type) {
52  if (Type == sys::fs::file_magic::unknown)
53    Type = sys::fs::identify_magic(Object->getBuffer());
54
55  switch (Type) {
56  case sys::fs::file_magic::unknown:
57  case sys::fs::file_magic::bitcode:
58  case sys::fs::file_magic::archive:
59  case sys::fs::file_magic::macho_universal_binary:
60  case sys::fs::file_magic::windows_resource:
61    if (BufferOwned)
62      delete Object;
63    return object_error::invalid_file_type;
64  case sys::fs::file_magic::elf_relocatable:
65  case sys::fs::file_magic::elf_executable:
66  case sys::fs::file_magic::elf_shared_object:
67  case sys::fs::file_magic::elf_core:
68    return createELFObjectFile(Object, BufferOwned);
69  case sys::fs::file_magic::macho_object:
70  case sys::fs::file_magic::macho_executable:
71  case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
72  case sys::fs::file_magic::macho_core:
73  case sys::fs::file_magic::macho_preload_executable:
74  case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
75  case sys::fs::file_magic::macho_dynamic_linker:
76  case sys::fs::file_magic::macho_bundle:
77  case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
78  case sys::fs::file_magic::macho_dsym_companion:
79    return createMachOObjectFile(Object, BufferOwned);
80  case sys::fs::file_magic::coff_object:
81  case sys::fs::file_magic::coff_import_library:
82  case sys::fs::file_magic::pecoff_executable:
83    return createCOFFObjectFile(Object, BufferOwned);
84  }
85  llvm_unreachable("Unexpected Object File Type");
86}
87
88ErrorOr<ObjectFile *> ObjectFile::createObjectFile(StringRef ObjectPath) {
89  std::unique_ptr<MemoryBuffer> File;
90  if (error_code EC = MemoryBuffer::getFile(ObjectPath, File))
91    return EC;
92  return createObjectFile(File.release());
93}
94