ObjectFile.cpp revision cd81d94322a39503e4a3e87b6ee03d4fcb3465fb 
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 <system_error>
20
21using namespace llvm;
22using namespace object;
23
24void ObjectFile::anchor() { }
25
26ObjectFile::ObjectFile(unsigned int Type, std::unique_ptr<MemoryBuffer> Source)
27    : SymbolicFile(Type, std::move(Source)) {}
28
29std::error_code ObjectFile::printSymbolName(raw_ostream &OS,
30                                            DataRefImpl Symb) const {
31  StringRef Name;
32  if (std::error_code EC = getSymbolName(Symb, Name))
33    return EC;
34  OS << Name;
35  return object_error::success;
36}
37
38std::error_code ObjectFile::getSymbolAlignment(DataRefImpl DRI,
39                                               uint32_t &Result) const {
40  Result = 0;
41  return object_error::success;
42}
43
44section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const {
45  return section_iterator(SectionRef(Sec, this));
46}
47
48ErrorOr<ObjectFile *>
49ObjectFile::createObjectFile(std::unique_ptr<MemoryBuffer> &Object,
50                             sys::fs::file_magic Type) {
51  if (Type == sys::fs::file_magic::unknown)
52    Type = sys::fs::identify_magic(Object->getBuffer());
53
54  switch (Type) {
55  case sys::fs::file_magic::unknown:
56  case sys::fs::file_magic::bitcode:
57  case sys::fs::file_magic::archive:
58  case sys::fs::file_magic::macho_universal_binary:
59  case sys::fs::file_magic::windows_resource:
60    return object_error::invalid_file_type;
61  case sys::fs::file_magic::elf_relocatable:
62  case sys::fs::file_magic::elf_executable:
63  case sys::fs::file_magic::elf_shared_object:
64  case sys::fs::file_magic::elf_core:
65    return createELFObjectFile(Object);
66  case sys::fs::file_magic::macho_object:
67  case sys::fs::file_magic::macho_executable:
68  case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
69  case sys::fs::file_magic::macho_core:
70  case sys::fs::file_magic::macho_preload_executable:
71  case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
72  case sys::fs::file_magic::macho_dynamic_linker:
73  case sys::fs::file_magic::macho_bundle:
74  case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
75  case sys::fs::file_magic::macho_dsym_companion:
76    return createMachOObjectFile(Object);
77  case sys::fs::file_magic::coff_object:
78  case sys::fs::file_magic::coff_import_library:
79  case sys::fs::file_magic::pecoff_executable:
80    return createCOFFObjectFile(std::move(Object));
81  }
82  llvm_unreachable("Unexpected Object File Type");
83}
84
85ErrorOr<ObjectFile *> ObjectFile::createObjectFile(StringRef ObjectPath) {
86  ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
87      MemoryBuffer::getFile(ObjectPath);
88  if (std::error_code EC = FileOrErr.getError())
89    return EC;
90  return createObjectFile(FileOrErr.get());
91}
92