001/*
002 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.replacements;
024
025import jdk.internal.jvmci.meta.*;
026
027import com.oracle.graal.api.replacements.*;
028import com.oracle.graal.compiler.common.type.*;
029import com.oracle.graal.graphbuilderconf.*;
030import com.oracle.graal.nodes.*;
031import com.oracle.graal.nodes.calc.*;
032
033/**
034 * A {@link ParameterPlugin} that binds constant values to some parameters.
035 */
036public class ConstantBindingParameterPlugin implements ParameterPlugin {
037    private final Object[] constantArgs;
038    private final MetaAccessProvider metaAccess;
039    private final SnippetReflectionProvider snippetReflection;
040
041    /**
042     * Creates a plugin that will create {@link ConstantNode}s for each parameter with an index
043     * equal to that of a non-null object in {@code constantArgs} (from which the
044     * {@link ConstantNode} is created if it isn't already a {@link ConstantNode}).
045     */
046    public ConstantBindingParameterPlugin(Object[] constantArgs, MetaAccessProvider metaAccess, SnippetReflectionProvider snippetReflection) {
047        this.constantArgs = constantArgs;
048        this.metaAccess = metaAccess;
049        this.snippetReflection = snippetReflection;
050    }
051
052    public FloatingNode interceptParameter(GraphBuilderContext b, int index, Stamp stamp) {
053        Object arg = constantArgs[index];
054        if (arg != null) {
055            ConstantNode constantNode;
056            if (arg instanceof ConstantNode) {
057                constantNode = (ConstantNode) arg;
058            } else if (arg instanceof Constant) {
059                constantNode = ConstantNode.forConstant(stamp, (Constant) arg, metaAccess);
060            } else {
061                constantNode = ConstantNode.forConstant(snippetReflection.forBoxed(stamp.getStackKind(), arg), metaAccess);
062            }
063            return constantNode;
064        }
065        return null;
066    }
067}