/*

 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2016 SAP SE. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "asm/codeBuffer.hpp"

#include "asm/macroAssembler.inline.hpp"

#include "memory/metaspaceShared.hpp"

// Generate the self-patching vtable method:

//

// This method will be called (as any other Klass virtual method) with

// the Klass itself as the first argument. Example:

//

//   oop obj;

//   int size = obj->klass()->klass_part()->oop_size(this);

//

// for which the virtual method call is Klass::oop_size();.

//

// The dummy method is called with the Klass object as the first

// operand, and an object as the second argument.

//

//=====================================================================

// All of the dummy methods in the vtable are essentially identical,

// differing only by an ordinal constant, and they bear no releationship

// to the original method which the caller intended. Also, there needs

// to be 'vtbl_list_size' instances of the vtable in order to

// differentiate between the 'vtable_list_size' original Klass objects.

#undef __

#define __ masm->

void MetaspaceShared::generate_vtable_methods(void** vtbl_list,

                                              void** vtable,

                                              char** md_top,

                                              char* md_end,

                                              char** mc_top,

                                              char* mc_end) {

  intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*);

  *(intptr_t *)(*md_top) = vtable_bytes;

  *md_top += sizeof(intptr_t);

  void** dummy_vtable = (void**)*md_top;

  *vtable = dummy_vtable;

  *md_top += vtable_bytes;

  // Get ready to generate dummy methods.

  CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);

  MacroAssembler* masm = new MacroAssembler(&cb);

  __ unimplemented();

}