/*
 * Copyright (c) 2011, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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
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 */

package java.lang.invoke;

import static java.lang.invoke.MethodHandleNatives.Constants.*;

/**
 * This method handle is used to optionally provide a count of how
 * many times it was invoked.
 *
 * @author never
 */
class CountingMethodHandle extends AdapterMethodHandle {
    private int vmcount;

    private CountingMethodHandle(MethodHandle target) {
        super(target, target.type(), AdapterMethodHandle.makeConv(OP_RETYPE_ONLY));
    }

    /** Wrap the incoming MethodHandle in a CountingMethodHandle if they are enabled */
    static MethodHandle wrap(MethodHandle mh) {
        if (MethodHandleNatives.COUNT_GWT) {
            return new CountingMethodHandle(mh);
        }
        return mh;
    }
}