001/*
002 * Copyright (c) 2011, 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(nameTemplate = "ConditionAnchor(!={p#negated})", allowedUsageTypes = {InputType.Guard})
033public final class ConditionAnchorNode extends FixedWithNextNode implements Canonicalizable.Unary<Node>, Lowerable, GuardingNode {
034
035    public static final NodeClass<ConditionAnchorNode> TYPE = NodeClass.create(ConditionAnchorNode.class);
036    @Input(InputType.Condition) LogicNode condition;
037    protected boolean negated;
038
039    public ConditionAnchorNode(LogicNode condition) {
040        this(condition, false);
041    }
042
043    public ConditionAnchorNode(LogicNode condition, boolean negated) {
044        super(TYPE, StampFactory.forVoid());
045        this.negated = negated;
046        this.condition = condition;
047    }
048
049    public LogicNode condition() {
050        return condition;
051    }
052
053    public boolean isNegated() {
054        return negated;
055    }
056
057    @Override
058    public String toString(Verbosity verbosity) {
059        if (verbosity == Verbosity.Name && negated) {
060            return "!" + super.toString(verbosity);
061        } else {
062            return super.toString(verbosity);
063        }
064    }
065
066    public Node canonical(CanonicalizerTool tool, Node forValue) {
067        if (condition instanceof LogicNegationNode) {
068            LogicNegationNode negation = (LogicNegationNode) condition;
069            return new ConditionAnchorNode(negation.getValue(), !negated);
070        }
071        if (condition instanceof LogicConstantNode) {
072            LogicConstantNode c = (LogicConstantNode) condition;
073            if (c.getValue() != negated) {
074                return null;
075            } else {
076                return new ValueAnchorNode(null);
077            }
078        }
079        if (tool.allUsagesAvailable() && this.hasNoUsages()) {
080            return null;
081        }
082        return this;
083    }
084
085    @Override
086    public void lower(LoweringTool tool) {
087        if (graph().getGuardsStage() == StructuredGraph.GuardsStage.FIXED_DEOPTS) {
088            ValueAnchorNode newAnchor = graph().add(new ValueAnchorNode(null));
089            graph().replaceFixedWithFixed(this, newAnchor);
090        }
091    }
092
093    public Node getValue() {
094        return condition;
095    }
096}