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