/*

 * Copyright (c) 2013, 2015, Oracle and/or its affiliates. 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.

 *

 */

#ifndef SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP

#define SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP

#include "memory/allocation.hpp"

#include "utilities/chunkedList.hpp"

class Metadata;

typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;

// Helper class to mark and unmark metadata used on the stack as either handles

// or executing methods, so that it can't be deleted during class redefinition

// and class unloading.

// This is also used for other things that can be deallocated, like class

// metadata during parsing if errors occur, relocated methods, and temporary

// constant pools.

class MetadataOnStackMark : public StackObj {

  NOT_PRODUCT(static bool _is_active;)

  static MetadataOnStackBuffer* _used_buffers;

  static MetadataOnStackBuffer* _free_buffers;

  static MetadataOnStackBuffer* _current_buffer;

  static MetadataOnStackBuffer* allocate_buffer();

  static void retire_buffer(MetadataOnStackBuffer* buffer);

 public:

  MetadataOnStackMark(bool redefinition_walk);

   ~MetadataOnStackMark();

  static void record(Metadata* m);

  static void retire_current_buffer();

};

#endif // SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP