001/*
002 * Copyright (c) 2013, 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.*;
028
029/**
030 * Logic node that negates its argument.
031 */
032@NodeInfo
033public final class LogicNegationNode extends LogicNode implements Canonicalizable.Unary<LogicNode> {
034
035    public static final NodeClass<LogicNegationNode> TYPE = NodeClass.create(LogicNegationNode.class);
036    @Input(InputType.Condition) LogicNode value;
037
038    public LogicNegationNode(LogicNode value) {
039        super(TYPE);
040        this.value = value;
041    }
042
043    public static LogicNode create(LogicNode value) {
044        LogicNode synonym = findSynonym(value);
045        if (synonym != null) {
046            return synonym;
047        }
048        return new LogicNegationNode(value);
049    }
050
051    private static LogicNode findSynonym(LogicNode value) {
052        if (value instanceof LogicConstantNode) {
053            LogicConstantNode logicConstantNode = (LogicConstantNode) value;
054            return LogicConstantNode.forBoolean(!logicConstantNode.getValue());
055        } else if (value instanceof LogicNegationNode) {
056            return ((LogicNegationNode) value).getValue();
057        }
058        return null;
059    }
060
061    public LogicNode getValue() {
062        return value;
063    }
064
065    @Override
066    public LogicNode canonical(CanonicalizerTool tool, LogicNode forValue) {
067        LogicNode synonym = findSynonym(forValue);
068        if (synonym != null) {
069            return synonym;
070        }
071        return this;
072    }
073
074}