lib/Object/Binary.cpp

   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 }