Add a SymbolicFile interface between Binary and ObjectFile.

This interface allows IRObjectFile to be implemented without having dummy
methods for all section and segment related methods.

Both llvm-ar and llvm-nm are changed to use it. Unfortunately the mangler is
still not plugged in since it requires some refactoring to make a Module hold
a DataLayout.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201881 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Object/IRObjectFile.h

@@ -0,0 +1,44 @@
+//===- IRObjectFile.h - LLVM IR object file implementation ------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the IRObjectFile template class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_OBJECT_IR_OBJECT_FILE_H
+#define LLVM_OBJECT_IR_OBJECT_FILE_H
+
+#include "llvm/Object/SymbolicFile.h"
+
+namespace llvm {
+class Module;
+class GlobalValue;
+
+namespace object {
+class IRObjectFile : public SymbolicFile {
+  OwningPtr<Module> M;
+public:
+  IRObjectFile(MemoryBuffer *Object, error_code &EC, LLVMContext &Context,
+               bool BufferOwned);
+  void moveSymbolNext(DataRefImpl &Symb) const LLVM_OVERRIDE;
+  error_code printSymbolName(raw_ostream &OS, DataRefImpl Symb) const
+      LLVM_OVERRIDE;
+  uint32_t getSymbolFlags(DataRefImpl Symb) const LLVM_OVERRIDE;
+  const GlobalValue &getSymbolGV(DataRefImpl Symb) const;
+  basic_symbol_iterator symbol_begin_impl() const LLVM_OVERRIDE;
+  basic_symbol_iterator symbol_end_impl() const LLVM_OVERRIDE;
+
+  static inline bool classof(const Binary *v) {
+    return v->isIR();
+  }
+};
+}
+}
+
+#endif