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/COFF.h"
15#include "llvm/Object/MachO.h"
16#include "llvm/Object/ObjectFile.h"
17#include "llvm/Support/ErrorHandling.h"
18#include "llvm/Support/FileSystem.h"
19#include "llvm/Support/MemoryBuffer.h"
20#include "llvm/Support/raw_ostream.h"
21#include <system_error>
22
23using namespace llvm;
24using namespace object;
25
26void ObjectFile::anchor() { }
27
28ObjectFile::ObjectFile(unsigned int Type, MemoryBufferRef Source)
29    : SymbolicFile(Type, Source) {}
30
31std::error_code ObjectFile::printSymbolName(raw_ostream &OS,
32                                            DataRefImpl Symb) const {
33  StringRef Name;
34  if (std::error_code EC = getSymbolName(Symb, Name))
35    return EC;
36  OS << Name;
37  return object_error::success;
38}
39
40std::error_code ObjectFile::getSymbolAlignment(DataRefImpl DRI,
41                                               uint32_t &Result) const {
42  Result = 0;
43  return object_error::success;
44}
45
46section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const {
47  return section_iterator(SectionRef(Sec, this));
48}
49
50ErrorOr<std::unique_ptr<ObjectFile>>
51ObjectFile::createObjectFile(MemoryBufferRef Object, sys::fs::file_magic Type) {
52  StringRef Data = Object.getBuffer();
53  if (Type == sys::fs::file_magic::unknown)
54    Type = sys::fs::identify_magic(Data);
55
56  switch (Type) {
57  case sys::fs::file_magic::unknown:
58  case sys::fs::file_magic::bitcode:
59  case sys::fs::file_magic::archive:
60  case sys::fs::file_magic::macho_universal_binary:
61  case sys::fs::file_magic::windows_resource:
62    return object_error::invalid_file_type;
63  case sys::fs::file_magic::elf:
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);
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  case sys::fs::file_magic::macho_kext_bundle:
80    return createMachOObjectFile(Object);
81  case sys::fs::file_magic::coff_object:
82  case sys::fs::file_magic::coff_import_library:
83  case sys::fs::file_magic::pecoff_executable:
84    return createCOFFObjectFile(Object);
85  }
86  llvm_unreachable("Unexpected Object File Type");
87}
88
89ErrorOr<OwningBinary<ObjectFile>>
90ObjectFile::createObjectFile(StringRef ObjectPath) {
91  ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
92      MemoryBuffer::getFile(ObjectPath);
93  if (std::error_code EC = FileOrErr.getError())
94    return EC;
95  std::unique_ptr<MemoryBuffer> Buffer = std::move(FileOrErr.get());
96
97  ErrorOr<std::unique_ptr<ObjectFile>> ObjOrErr =
98      createObjectFile(Buffer->getMemBufferRef());
99  if (std::error_code EC = ObjOrErr.getError())
100    return EC;
101  std::unique_ptr<ObjectFile> Obj = std::move(ObjOrErr.get());
102
103  return OwningBinary<ObjectFile>(std::move(Obj), std::move(Buffer));
104}
105