Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/GuardingPiNode.java @ 12383:1d2d7924033a
Remove reduduant guards stage check in GuardingPiNode.lower
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Mon, 14 Oct 2013 15:52:24 +0200 |
parents | da9db8331658 |
children | 139b84d713bc |
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/* * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.nodes; import com.oracle.graal.api.meta.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.extended.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * A node that changes the stamp of its input based on some condition being true. */ @NodeInfo(nameTemplate = "GuardingPi(!={p#negated}) {p#reason/s}") public class GuardingPiNode extends FixedWithNextNode implements Lowerable, GuardingNode, Canonicalizable, ValueProxy { @Input private ValueNode object; @Input private LogicNode condition; private final DeoptimizationReason reason; private final DeoptimizationAction action; private boolean negated; public ValueNode object() { return object; } public LogicNode condition() { return condition; } /** * Constructor for {@link #guardingNonNull(Object)} node intrinsic. */ private GuardingPiNode(ValueNode object) { this(object, object.graph().unique(new IsNullNode(object)), true, DeoptimizationReason.NullCheckException, DeoptimizationAction.None, object.stamp().join(StampFactory.objectNonNull())); } /** * Creates a guarding pi node. * * @param object the object whose type is refined if this guard succeeds * @param condition the condition to test * @param negateCondition the guard succeeds if {@code condition != negateCondition} * @param stamp the refined type of the object if the guard succeeds */ public GuardingPiNode(ValueNode object, ValueNode condition, boolean negateCondition, DeoptimizationReason reason, DeoptimizationAction action, Stamp stamp) { super(stamp); assert stamp != null; this.object = object; this.condition = (LogicNode) condition; this.reason = reason; this.action = action; this.negated = negateCondition; } @Override public void lower(LoweringTool tool) { GuardingNode guard = tool.createGuard(condition, reason, action, negated); ValueAnchorNode anchor = graph().add(new ValueAnchorNode((ValueNode) guard)); PiNode pi = graph().unique(new PiNode(object, stamp(), (ValueNode) guard)); replaceAtUsages(pi); graph().replaceFixedWithFixed(this, anchor); } @Override public boolean inferStamp() { return updateStamp(stamp().join(object().stamp())); } @Override public Node canonical(CanonicalizerTool tool) { if (stamp() == StampFactory.illegal(object.kind())) { // The guard always fails return graph().add(new DeoptimizeNode(action, reason)); } if (condition instanceof LogicConstantNode) { LogicConstantNode c = (LogicConstantNode) condition; if (c.getValue() == negated) { // The guard always fails return graph().add(new DeoptimizeNode(action, reason)); } if (c.getValue() != negated && stamp().equals(object().stamp())) { return object; } } return this; } @NodeIntrinsic public static <T> T guardingNonNull(T object) { if (object == null) { throw new NullPointerException(); } return object; } @NodeIntrinsic public static native Object guardingPi(Object object, LogicNode condition, @ConstantNodeParameter boolean negateCondition, @ConstantNodeParameter DeoptimizationReason reason, @ConstantNodeParameter DeoptimizationAction action, @ConstantNodeParameter Stamp stamp); @Override public ValueNode getOriginalValue() { return object; } }