/*

 * Copyright (c) 2015, 2016, 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 org.graalvm.compiler.replacements;

import org.graalvm.compiler.api.replacements.SnippetReflectionProvider;

import org.graalvm.compiler.core.common.type.StampPair;

import org.graalvm.compiler.nodes.ConstantNode;

import org.graalvm.compiler.nodes.calc.FloatingNode;

import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderTool;

import org.graalvm.compiler.nodes.graphbuilderconf.ParameterPlugin;

import jdk.vm.ci.meta.Constant;

import jdk.vm.ci.meta.MetaAccessProvider;

/**

 * A {@link ParameterPlugin} that binds constant values to some parameters.

 */

public class ConstantBindingParameterPlugin implements ParameterPlugin {

    private final Object[] constantArgs;

    private final MetaAccessProvider metaAccess;

    private final SnippetReflectionProvider snippetReflection;

    /**

     * Creates a plugin that will create {@link ConstantNode}s for each parameter with an index

     * equal to that of a non-null object in {@code constantArgs} (from which the

     * {@link ConstantNode} is created if it isn't already a {@link ConstantNode}).

     */

    public ConstantBindingParameterPlugin(Object[] constantArgs, MetaAccessProvider metaAccess, SnippetReflectionProvider snippetReflection) {

        this.constantArgs = constantArgs;

        this.metaAccess = metaAccess;

        this.snippetReflection = snippetReflection;

    }

    @Override

    public FloatingNode interceptParameter(GraphBuilderTool b, int index, StampPair stamp) {

        Object arg = constantArgs[index];

        if (arg != null) {

            ConstantNode constantNode;

            if (arg instanceof ConstantNode) {

                constantNode = (ConstantNode) arg;

            } else if (arg instanceof Constant) {

                constantNode = ConstantNode.forConstant(stamp.getTrustedStamp(), (Constant) arg, metaAccess);

            } else {

                constantNode = ConstantNode.forConstant(snippetReflection.forBoxed(stamp.getTrustedStamp().getStackKind(), arg), metaAccess);

            }

            return constantNode;

        }

        return null;

    }

}