001/*
002 * Copyright (c) 2009, 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.nodes;
024
025import com.oracle.graal.compiler.common.type.*;
026import com.oracle.graal.graph.*;
027import com.oracle.graal.graph.spi.*;
028import com.oracle.graal.nodeinfo.*;
029import com.oracle.graal.nodes.*;
030import com.oracle.graal.replacements.Snippet.VarargsParameter;
031
032/**
033 * Implements the semantics of {@link VarargsParameter}.
034 */
035@NodeInfo
036public final class LoadSnippetVarargParameterNode extends FixedWithNextNode implements Canonicalizable {
037
038    public static final NodeClass<LoadSnippetVarargParameterNode> TYPE = NodeClass.create(LoadSnippetVarargParameterNode.class);
039    @Input ValueNode index;
040
041    @Input NodeInputList<ParameterNode> parameters;
042
043    public LoadSnippetVarargParameterNode(ParameterNode[] locals, ValueNode index, Stamp stamp) {
044        super(TYPE, stamp);
045        this.index = index;
046        this.parameters = new NodeInputList<>(this, locals);
047    }
048
049    @Override
050    public Node canonical(CanonicalizerTool tool) {
051        if (index.isConstant()) {
052            return parameters.get(index.asJavaConstant().asInt());
053        }
054        return this;
055    }
056}