1 //===- Binary.cpp - A generic binary file ---------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file defines the Binary class.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "llvm/Object/Binary.h"
14 #include "llvm/ADT/StringRef.h"
15 #include "llvm/BinaryFormat/Magic.h"
16 #include "llvm/Object/Archive.h"
17 #include "llvm/Object/Error.h"
18 #include "llvm/Object/MachOUniversal.h"
19 #include "llvm/Object/ObjectFile.h"
20 #include "llvm/Object/WindowsResource.h"
21 #include "llvm/Support/Error.h"
22 #include "llvm/Support/ErrorHandling.h"
23 #include "llvm/Support/ErrorOr.h"
24 #include "llvm/Support/FileSystem.h"
25 #include "llvm/Support/MemoryBuffer.h"
26 #include <algorithm>
27 #include <memory>
28 #include <system_error>
29 
30 using namespace llvm;
31 using namespace object;
32 
33 Binary::~Binary() = default;
34 
35 Binary::Binary(unsigned int Type, MemoryBufferRef Source)
36     : TypeID(Type), Data(Source) {}
37 
38 StringRef Binary::getData() const { return Data.getBuffer(); }
39 
40 StringRef Binary::getFileName() const { return Data.getBufferIdentifier(); }
41 
42 MemoryBufferRef Binary::getMemoryBufferRef() const { return Data; }
43 
44 Expected<std::unique_ptr<Binary>> object::createBinary(MemoryBufferRef Buffer,
45                                                       LLVMContext *Context) {
46   file_magic Type = identify_magic(Buffer.getBuffer());
47 
48   switch (Type) {
49   case file_magic::archive:
50     return Archive::create(Buffer);
51   case file_magic::elf:
52   case file_magic::elf_relocatable:
53   case file_magic::elf_executable:
54   case file_magic::elf_shared_object:
55   case file_magic::elf_core:
56   case file_magic::macho_object:
57   case file_magic::macho_executable:
58   case file_magic::macho_fixed_virtual_memory_shared_lib:
59   case file_magic::macho_core:
60   case file_magic::macho_preload_executable:
61   case file_magic::macho_dynamically_linked_shared_lib:
62   case file_magic::macho_dynamic_linker:
63   case file_magic::macho_bundle:
64   case file_magic::macho_dynamically_linked_shared_lib_stub:
65   case file_magic::macho_dsym_companion:
66   case file_magic::macho_kext_bundle:
67   case file_magic::coff_object:
68   case file_magic::coff_import_library:
69   case file_magic::pecoff_executable:
70   case file_magic::bitcode:
71   case file_magic::wasm_object:
72     return ObjectFile::createSymbolicFile(Buffer, Type, Context);
73   case file_magic::macho_universal_binary:
74     return MachOUniversalBinary::create(Buffer);
75   case file_magic::windows_resource:
76     return WindowsResource::createWindowsResource(Buffer);
77   case file_magic::pdb:
78     // PDB does not support the Binary interface.
79     return errorCodeToError(object_error::invalid_file_type);
80   case file_magic::unknown:
81   case file_magic::coff_cl_gl_object:
82     // Unrecognized object file format.
83     return errorCodeToError(object_error::invalid_file_type);
84   }
85   llvm_unreachable("Unexpected Binary File Type");
86 }
87 
88 Expected<OwningBinary<Binary>> object::createBinary(StringRef Path) {
89   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
90       MemoryBuffer::getFileOrSTDIN(Path, /*FileSize=*/-1,
91                                    /*RequiresNullTerminator=*/false);
92   if (std::error_code EC = FileOrErr.getError())
93     return errorCodeToError(EC);
94   std::unique_ptr<MemoryBuffer> &Buffer = FileOrErr.get();
95 
96   Expected<std::unique_ptr<Binary>> BinOrErr =
97       createBinary(Buffer->getMemBufferRef());
98   if (!BinOrErr)
99     return BinOrErr.takeError();
100   std::unique_ptr<Binary> &Bin = BinOrErr.get();
101 
102   return OwningBinary<Binary>(std::move(Bin), std::move(Buffer));
103 }
104