/*

 * Copyright (c) 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.

 */

package java.lang.invoke;

import java.lang.invoke.MethodHandles.Lookup;

import jdk.internal.vm.annotation.DontInline;

import jdk.internal.vm.annotation.ForceInline;

/**

 * Helper class to inject into java.lang.invoke that provides access to

 * package-private methods in this package.

 */

public class MethodHandleHelper {

    private MethodHandleHelper() { }

    public static final Lookup IMPL_LOOKUP = Lookup.IMPL_LOOKUP;

    public static final Class<?> MHN_CALL_SITE_CONTEXT_CLASS

            = MethodHandleNatives.CallSiteContext.class;

    public static void customize(MethodHandle mh) {

        mh.customize();

    }

    @ForceInline

    public static Object invokeBasicL(MethodHandle mh) throws Throwable {

        return mh.invokeBasic();

    }

    @ForceInline

    public static int invokeBasicI(MethodHandle mh) throws Throwable {

        return (int) mh.invokeBasic();

    }

    public static MethodHandle varargsArray(int nargs) {

        return MethodHandleImpl.varargsArray(nargs);

    }

    public static MethodHandle varargsArray(Class<?> arrayType, int nargs) {

        return MethodHandleImpl.varargsArray(arrayType, nargs);

    }

    public static LambdaForm getLambdaForm(MethodHandle mh) {

        return mh.form;

    }

    public static class NonInlinedReinvoker extends DelegatingMethodHandle {

        private final MethodHandle target;

        private NonInlinedReinvoker(MethodHandle target, LambdaForm lf) {

            super(target.type(), lf);

            this.target = target;

        }

        @Override

        public MethodHandle getTarget() {

            return target;

        }

        @Override

        public MethodHandle asTypeUncached(MethodType newType) {

            return asTypeCache = target.asType(newType);

        }

        public static MethodHandle make(MethodHandle target) {

            LambdaForm lform = DelegatingMethodHandle.makeReinvokerForm(

                    target, -1, DelegatingMethodHandle.class, "reinvoker.dontInline",

                /*forceInline=*/false, DelegatingMethodHandle.NF_getTarget, null);

            return new NonInlinedReinvoker(target, lform);

        }

    }

}