001/*
002 * Copyright (c) 2012, 2014, 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.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.extended.*;
030import com.oracle.graal.nodes.spi.*;
031
032@NodeInfo(allowedUsageTypes = {InputType.Guard}, nameTemplate = "Proxy({i#value})")
033public final class GuardProxyNode extends ProxyNode implements GuardingNode, Proxy, LIRLowerable, Canonicalizable {
034
035    public static final NodeClass<GuardProxyNode> TYPE = NodeClass.create(GuardProxyNode.class);
036    @OptionalInput(InputType.Guard) GuardingNode value;
037
038    public GuardProxyNode(GuardingNode value, AbstractBeginNode proxyPoint) {
039        super(TYPE, StampFactory.forVoid(), proxyPoint);
040        this.value = value;
041    }
042
043    @Override
044    public void generate(NodeLIRBuilderTool generator) {
045    }
046
047    public void setValue(GuardingNode newValue) {
048        this.updateUsages(value.asNode(), newValue.asNode());
049        this.value = newValue;
050    }
051
052    @Override
053    public ValueNode value() {
054        return (value == null ? null : value.asNode());
055    }
056
057    public Node getOriginalNode() {
058        return (value == null ? null : value.asNode());
059    }
060
061    public Node canonical(CanonicalizerTool tool) {
062        if (value == null) {
063            return null;
064        }
065        return this;
066    }
067}