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, std::unique_ptr<MemoryBuffer> Source)
  27     : SymbolicFile(Type, std::move(Source)) {}
  28
  29 std::error_code ObjectFile::printSymbolName(raw_ostream &OS,
  30                                             DataRefImpl Symb) const {
  31   StringRef Name;
  32   if (std::error_code EC = getSymbolName(Symb, Name))
  33     return EC;
  34   OS << Name;
  35   return object_error::success;
  36 }
  37
  38 std::error_code ObjectFile::getSymbolAlignment(DataRefImpl DRI,
  39                                                uint32_t &Result) const {
  40   Result = 0;
  41   return object_error::success;
  42 }
  43
  44 section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const {
  45   return section_iterator(SectionRef(Sec, this));
  46 }
  47
  48 ErrorOr<ObjectFile *>
  49 ObjectFile::createObjectFile(std::unique_ptr<MemoryBuffer> &Object,
  50                              sys::fs::file_magic Type) {
  51   if (Type == sys::fs::file_magic::unknown)
  52     Type = sys::fs::identify_magic(Object->getBuffer());
  53
  54   switch (Type) {
  55   case sys::fs::file_magic::unknown:
  56   case sys::fs::file_magic::bitcode:
  57   case sys::fs::file_magic::archive:
  58   case sys::fs::file_magic::macho_universal_binary:
  59   case sys::fs::file_magic::windows_resource:
  60     return object_error::invalid_file_type;
  61   case sys::fs::file_magic::elf_relocatable:
  62   case sys::fs::file_magic::elf_executable:
  63   case sys::fs::file_magic::elf_shared_object:
  64   case sys::fs::file_magic::elf_core:
  65     return createELFObjectFile(Object);
  66   case sys::fs::file_magic::macho_object:
  67   case sys::fs::file_magic::macho_executable:
  68   case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
  69   case sys::fs::file_magic::macho_core:
  70   case sys::fs::file_magic::macho_preload_executable:
  71   case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
  72   case sys::fs::file_magic::macho_dynamic_linker:
  73   case sys::fs::file_magic::macho_bundle:
  74   case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
  75   case sys::fs::file_magic::macho_dsym_companion:
  76     return createMachOObjectFile(Object);
  77   case sys::fs::file_magic::coff_object:
  78   case sys::fs::file_magic::coff_import_library:
  79   case sys::fs::file_magic::pecoff_executable:
  80     return createCOFFObjectFile(std::move(Object));
  81   }
  82   llvm_unreachable("Unexpected Object File Type");
  83 }
  84
  85 ErrorOr<ObjectFile *> ObjectFile::createObjectFile(StringRef ObjectPath) {
  86   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  87       MemoryBuffer::getFile(ObjectPath);
  88   if (std::error_code EC = FileOrErr.getError())
  89     return EC;
  90   return createObjectFile(FileOrErr.get());
  91 }