/*

 * Copyright 2008-2009 Sun Microsystems, Inc.  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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package sun.dyn;

import java.dyn.*;

/**

 * The CallSite privately created by the JVM at every invokedynamic instruction.

 * @author jrose

 */

class CallSiteImpl extends CallSite {

    // Fields used only by the JVM.  Do not use or change.

    private Object vmmethod;

    // Values supplied by the JVM:

    int callerMID, callerBCI;

    private CallSiteImpl(Class<?> caller, String name, MethodType type) {

        super(caller, name, type);

    }

    @Override

    public void setTarget(MethodHandle mh) {

        checkTarget(mh);

        if (MethodHandleNatives.JVM_SUPPORT)

            MethodHandleNatives.linkCallSite(this, (MethodHandle) mh);

        else

            super.setTarget(mh);

    }

    private static final MethodHandle PRIVATE_INITIALIZE_CALL_SITE =

            MethodHandleImpl.IMPL_LOOKUP.findStatic(CallSite.class, "privateInitializeCallSite",

                MethodType.make(void.class, CallSite.class, int.class, int.class));

    // this is the up-call from the JVM:

    static CallSite makeSite(Class<?> caller, String name, MethodType type,

                             int callerMID, int callerBCI) {

        MethodHandle bsm = Linkage.getBootstrapMethod(caller);

        if (bsm == null)

            throw new InvokeDynamicBootstrapError("class has no bootstrap method: "+caller);

        CallSite site = bsm.<CallSite>invoke(caller, name, type);

        if (site == null)

            throw new InvokeDynamicBootstrapError("class bootstrap method failed to create a call site: "+caller);

        PRIVATE_INITIALIZE_CALL_SITE.<void>invoke(site, callerMID, callerBCI);

        return site;

    }

}