001/*
002 * Copyright (c) 2012, 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.nodes;
024
025import com.oracle.graal.graph.*;
026import com.oracle.graal.graph.spi.*;
027import com.oracle.graal.nodeinfo.*;
028import com.oracle.graal.nodes.spi.*;
029import com.oracle.graal.nodes.virtual.*;
030
031@NodeInfo(nameTemplate = "Proxy({i#value})")
032public final class ValueProxyNode extends ProxyNode implements Canonicalizable, Virtualizable, ValueProxy {
033
034    public static final NodeClass<ValueProxyNode> TYPE = NodeClass.create(ValueProxyNode.class);
035    @Input ValueNode value;
036
037    public ValueProxyNode(ValueNode value, AbstractBeginNode proxyPoint) {
038        super(TYPE, value.stamp(), proxyPoint);
039        this.value = value;
040    }
041
042    @Override
043    public ValueNode value() {
044        return value;
045    }
046
047    @Override
048    public boolean inferStamp() {
049        return updateStamp(value.stamp());
050    }
051
052    @Override
053    public Node canonical(CanonicalizerTool tool) {
054        if (value.isConstant()) {
055            return value;
056        }
057        return this;
058    }
059
060    @Override
061    public void virtualize(VirtualizerTool tool) {
062        ValueNode alias = tool.getAlias(value);
063        if (alias instanceof VirtualObjectNode) {
064            tool.replaceWithVirtual((VirtualObjectNode) alias);
065        }
066    }
067
068    @Override
069    public ValueNode getOriginalNode() {
070        return value();
071    }
072}