lib/Object/ObjectFile.cpp

   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
  23 using namespace llvm;
  24 using namespace object;
  25
  26 void ObjectFile::anchor() { }
  27
  28 ObjectFile::ObjectFile(unsigned int Type, MemoryBufferRef Source)
  29     : SymbolicFile(Type, Source) {}
  30
  31 std::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
  40 std::error_code ObjectFile::getSymbolAlignment(DataRefImpl DRI,
  41                                                uint32_t &Result) const {
  42   Result = 0;
  43   return object_error::success;
  44 }
  45
  46 section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const {
  47   return section_iterator(SectionRef(Sec, this));
  48 }
  49
  50 ErrorOr<std::unique_ptr<ObjectFile>>
  51 ObjectFile::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_relocatable:
  64   case sys::fs::file_magic::elf_executable:
  65   case sys::fs::file_magic::elf_shared_object:
  66   case sys::fs::file_magic::elf_core:
  67     return createELFObjectFile(Object);
  68   case sys::fs::file_magic::macho_object:
  69   case sys::fs::file_magic::macho_executable:
  70   case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
  71   case sys::fs::file_magic::macho_core:
  72   case sys::fs::file_magic::macho_preload_executable:
  73   case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
  74   case sys::fs::file_magic::macho_dynamic_linker:
  75   case sys::fs::file_magic::macho_bundle:
  76   case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
  77   case sys::fs::file_magic::macho_dsym_companion:
  78     return createMachOObjectFile(Object);
  79   case sys::fs::file_magic::coff_object:
  80   case sys::fs::file_magic::coff_import_library:
  81   case sys::fs::file_magic::pecoff_executable:
  82     return createCOFFObjectFile(Object);
  83   }
  84   llvm_unreachable("Unexpected Object File Type");
  85 }
  86
  87 ErrorOr<OwningBinary<ObjectFile>>
  88 ObjectFile::createObjectFile(StringRef ObjectPath) {
  89   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  90       MemoryBuffer::getFile(ObjectPath);
  91   if (std::error_code EC = FileOrErr.getError())
  92     return EC;
  93   std::unique_ptr<MemoryBuffer> Buffer = std::move(FileOrErr.get());
  94
  95   ErrorOr<std::unique_ptr<ObjectFile>> ObjOrErr =
  96       createObjectFile(Buffer->getMemBufferRef());
  97   if (std::error_code EC = ObjOrErr.getError())
  98     return EC;
  99   std::unique_ptr<ObjectFile> Obj = std::move(ObjOrErr.get());
 100
 101   return OwningBinary<ObjectFile>(std::move(Obj), std::move(Buffer));
 102 }