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/MemoryBuffer.h"
  18 #include "llvm/Support/Path.h"
  19 #include "llvm/Support/system_error.h"
  20
  21 using namespace llvm;
  22 using namespace object;
  23
  24 void ObjectFile::anchor() { }
  25
  26 ObjectFile::ObjectFile(unsigned int Type, MemoryBuffer *source)
  27   : Binary(Type, source) {
  28 }
  29
  30 error_code ObjectFile::getSymbolAlignment(DataRefImpl DRI,
  31                                           uint32_t &Result) const {
  32   Result = 0;
  33   return object_error::success;
  34 }
  35
  36 section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const {
  37   return section_iterator(SectionRef(Sec, this));
  38 }
  39
  40 ObjectFile *ObjectFile::createObjectFile(MemoryBuffer *Object) {
  41   if (!Object || Object->getBufferSize() < 64)
  42     return 0;
  43   sys::LLVMFileType type = sys::IdentifyFileType(Object->getBufferStart(),
  44                                 static_cast<unsigned>(Object->getBufferSize()));
  45   switch (type) {
  46     case sys::Unknown_FileType:
  47       return 0;
  48     case sys::ELF_Relocatable_FileType:
  49     case sys::ELF_Executable_FileType:
  50     case sys::ELF_SharedObject_FileType:
  51     case sys::ELF_Core_FileType:
  52       return createELFObjectFile(Object);
  53     case sys::Mach_O_Object_FileType:
  54     case sys::Mach_O_Executable_FileType:
  55     case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
  56     case sys::Mach_O_Core_FileType:
  57     case sys::Mach_O_PreloadExecutable_FileType:
  58     case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
  59     case sys::Mach_O_DynamicLinker_FileType:
  60     case sys::Mach_O_Bundle_FileType:
  61     case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
  62     case sys::Mach_O_DSYMCompanion_FileType:
  63       return createMachOObjectFile(Object);
  64     case sys::COFF_FileType:
  65       return createCOFFObjectFile(Object);
  66     default:
  67       llvm_unreachable("Unexpected Object File Type");
  68   }
  69 }
  70
  71 ObjectFile *ObjectFile::createObjectFile(StringRef ObjectPath) {
  72   OwningPtr<MemoryBuffer> File;
  73   if (MemoryBuffer::getFile(ObjectPath, File))
  74     return NULL;
  75   return createObjectFile(File.take());
  76 }