contrib/llvm/lib/Object/SymbolicFile.cpp

   1 //===- SymbolicFile.cpp - Interface that only provides symbols ------------===//
   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 SymbolicFile class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/Object/SymbolicFile.h"
  15 #include "llvm/ADT/StringRef.h"
  16 #include "llvm/BinaryFormat/Magic.h"
  17 #include "llvm/Object/COFFImportFile.h"
  18 #include "llvm/Object/Error.h"
  19 #include "llvm/Object/IRObjectFile.h"
  20 #include "llvm/Object/ObjectFile.h"
  21 #include "llvm/Support/Compiler.h"
  22 #include "llvm/Support/Error.h"
  23 #include "llvm/Support/ErrorHandling.h"
  24 #include "llvm/Support/ErrorOr.h"
  25 #include "llvm/Support/FileSystem.h"
  26 #include "llvm/Support/MemoryBuffer.h"
  27 #include <algorithm>
  28 #include <memory>
  29
  30 using namespace llvm;
  31 using namespace object;
  32
  33 SymbolicFile::SymbolicFile(unsigned int Type, MemoryBufferRef Source)
  34     : Binary(Type, Source) {}
  35
  36 SymbolicFile::~SymbolicFile() = default;
  37
  38 Expected<std::unique_ptr<SymbolicFile>>
  39 SymbolicFile::createSymbolicFile(MemoryBufferRef Object, file_magic Type,
  40                                  LLVMContext *Context) {
  41   StringRef Data = Object.getBuffer();
  42   if (Type == file_magic::unknown)
  43     Type = identify_magic(Data);
  44
  45   switch (Type) {
  46   case file_magic::bitcode:
  47     if (Context)
  48       return IRObjectFile::create(Object, *Context);
  49     LLVM_FALLTHROUGH;
  50   case file_magic::unknown:
  51   case file_magic::archive:
  52   case file_magic::coff_cl_gl_object:
  53   case file_magic::macho_universal_binary:
  54   case file_magic::windows_resource:
  55     return errorCodeToError(object_error::invalid_file_type);
  56   case file_magic::elf:
  57   case file_magic::elf_executable:
  58   case file_magic::elf_shared_object:
  59   case file_magic::elf_core:
  60   case file_magic::macho_executable:
  61   case file_magic::macho_fixed_virtual_memory_shared_lib:
  62   case file_magic::macho_core:
  63   case file_magic::macho_preload_executable:
  64   case file_magic::macho_dynamically_linked_shared_lib:
  65   case file_magic::macho_dynamic_linker:
  66   case file_magic::macho_bundle:
  67   case file_magic::macho_dynamically_linked_shared_lib_stub:
  68   case file_magic::macho_dsym_companion:
  69   case file_magic::macho_kext_bundle:
  70   case file_magic::pecoff_executable:
  71   case file_magic::wasm_object:
  72     return ObjectFile::createObjectFile(Object, Type);
  73   case file_magic::coff_import_library:
  74     return std::unique_ptr<SymbolicFile>(new COFFImportFile(Object));
  75   case file_magic::elf_relocatable:
  76   case file_magic::macho_object:
  77   case file_magic::coff_object: {
  78     Expected<std::unique_ptr<ObjectFile>> Obj =
  79         ObjectFile::createObjectFile(Object, Type);
  80     if (!Obj || !Context)
  81       return std::move(Obj);
  82
  83     ErrorOr<MemoryBufferRef> BCData =
  84         IRObjectFile::findBitcodeInObject(*Obj->get());
  85     if (!BCData)
  86       return std::move(Obj);
  87
  88     return IRObjectFile::create(
  89         MemoryBufferRef(BCData->getBuffer(), Object.getBufferIdentifier()),
  90         *Context);
  91   }
  92   }
  93   llvm_unreachable("Unexpected Binary File Type");
  94 }