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/ADT/OwningPtr.h"
  16 #include "llvm/Support/ErrorHandling.h"
  17 #include "llvm/Support/FileSystem.h"
  18 #include "llvm/Support/MemoryBuffer.h"
  19 #include "llvm/Support/raw_ostream.h"
  20 #include "llvm/Support/system_error.h"
  21
  22 using namespace llvm;
  23 using namespace object;
  24
  25 void ObjectFile::anchor() { }
  26
  27 ObjectFile::ObjectFile(unsigned int Type, MemoryBuffer *Source,
  28                        bool BufferOwned)
  29     : SymbolicFile(Type, Source, BufferOwned) {}
  30
  31 error_code ObjectFile::printSymbolName(raw_ostream &OS,
  32                                        DataRefImpl Symb) const {
  33   StringRef Name;
  34   if (error_code EC = getSymbolName(Symb, Name))
  35     return EC;
  36   OS << Name;
  37   return object_error::success;
  38 }
  39
  40 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<ObjectFile *> ObjectFile::createObjectFile(MemoryBuffer *Object,
  51                                                    bool BufferOwned,
  52                                                    sys::fs::file_magic Type) {
  53   if (Type == sys::fs::file_magic::unknown)
  54     Type = sys::fs::identify_magic(Object->getBuffer());
  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     if (BufferOwned)
  63       delete Object;
  64     return object_error::invalid_file_type;
  65   case sys::fs::file_magic::elf_relocatable:
  66   case sys::fs::file_magic::elf_executable:
  67   case sys::fs::file_magic::elf_shared_object:
  68   case sys::fs::file_magic::elf_core:
  69     return createELFObjectFile(Object, BufferOwned);
  70   case sys::fs::file_magic::macho_object:
  71   case sys::fs::file_magic::macho_executable:
  72   case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
  73   case sys::fs::file_magic::macho_core:
  74   case sys::fs::file_magic::macho_preload_executable:
  75   case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
  76   case sys::fs::file_magic::macho_dynamic_linker:
  77   case sys::fs::file_magic::macho_bundle:
  78   case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
  79   case sys::fs::file_magic::macho_dsym_companion:
  80     return createMachOObjectFile(Object, BufferOwned);
  81   case sys::fs::file_magic::coff_object:
  82   case sys::fs::file_magic::coff_import_library:
  83   case sys::fs::file_magic::pecoff_executable:
  84     return createCOFFObjectFile(Object, BufferOwned);
  85   }
  86   llvm_unreachable("Unexpected Object File Type");
  87 }
  88
  89 ErrorOr<ObjectFile *> ObjectFile::createObjectFile(StringRef ObjectPath) {
  90   OwningPtr<MemoryBuffer> File;
  91   if (error_code EC = MemoryBuffer::getFile(ObjectPath, File))
  92     return EC;
  93   return createObjectFile(File.release());
  94 }