Add LLVMObject Library.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119107 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Object/ObjectFile.cpp

@@ -0,0 +1,68 @@
+//===- ObjectFile.cpp - File format independent object file -----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines a file format independent ObjectFile class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Object/ObjectFile.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/MemoryBuffer.h"
+
+namespace llvm {
+namespace object {
+
+ObjectFile::ObjectFile(MemoryBuffer *Object)
+  : MapFile(Object) {
+  assert(MapFile && "Must be a valid MemoryBuffer!");
+  base = reinterpret_cast<const uint8_t *>(MapFile->getBufferStart());
+}
+
+ObjectFile::~ObjectFile() {
+  delete MapFile;
+}
+
+StringRef ObjectFile::getFilename() const {
+  return MapFile->getBufferIdentifier();
+}
+
+ObjectFile *ObjectFile::createObjectFile(MemoryBuffer *Object) {
+  if (!Object || Object->getBufferSize() < 64)
+    return 0;
+  sys::LLVMFileType type = sys::IdentifyFileType(Object->getBufferStart(),
+                                static_cast<unsigned>(Object->getBufferSize()));
+  switch (type) {
+    case sys::ELF_Relocatable_FileType:
+    case sys::ELF_Executable_FileType:
+    case sys::ELF_SharedObject_FileType:
+    case sys::ELF_Core_FileType:
+        return 0;
+    case sys::Mach_O_Object_FileType:
+    case sys::Mach_O_Executable_FileType:
+    case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
+    case sys::Mach_O_Core_FileType:
+    case sys::Mach_O_PreloadExectuable_FileType:
+    case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
+    case sys::Mach_O_DynamicLinker_FileType:
+    case sys::Mach_O_Bundle_FileType:
+    case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
+      return 0;
+    case sys::COFF_FileType:
+      return 0;
+    default:
+      llvm_unreachable("Unknown Object File Type");
+  }
+}
+
+ObjectFile *ObjectFile::createObjectFile(const sys::Path &ObjectPath) {
+  return createObjectFile(MemoryBuffer::getFile(ObjectPath.c_str()));
+}
+
+} // end namespace object
+} // end namespace llvm