Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/InstanceOfNode.java @ 11881:da9db8331658
moved Canonicalizable and Simplifiable to the com.oracle.graal.graph project (GRAAL-506)
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 01 Oct 2013 20:38:25 +0200 |
parents | 9a747d8e0d0f |
children | 23ccaa863eda |
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/* * Copyright (c) 2009, 2011, 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.java; import com.oracle.graal.api.meta.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * The {@code InstanceOfNode} represents an instanceof test. */ public final class InstanceOfNode extends LogicNode implements Canonicalizable, Lowerable, Virtualizable { @Input private ValueNode object; private final ResolvedJavaType type; private JavaTypeProfile profile; /** * Constructs a new InstanceOfNode. * * @param type the target type of the instanceof check * @param object the object being tested by the instanceof */ public InstanceOfNode(ResolvedJavaType type, ValueNode object, JavaTypeProfile profile) { this.type = type; this.object = object; this.profile = profile; assert type != null; } @Override public void lower(LoweringTool tool) { tool.getRuntime().lower(this, tool); } @Override public Node canonical(CanonicalizerTool tool) { Stamp stamp = object().stamp(); if (!(stamp instanceof ObjectStamp)) { return this; } ObjectStamp objectStamp = (ObjectStamp) stamp; if (objectStamp.alwaysNull()) { return LogicConstantNode.contradiction(graph()); } ResolvedJavaType stampType = objectStamp.type(); if (stampType != null) { boolean subType = type().isAssignableFrom(stampType); if (subType) { if (objectStamp.nonNull()) { // the instanceOf matches, so return true return LogicConstantNode.tautology(graph()); } else { // the instanceof matches if the object is non-null, so return true depending on // the null-ness. IsNullNode isNull = graph().unique(new IsNullNode(object())); return graph().unique(new LogicNegationNode(isNull)); } } else { if (objectStamp.isExactType()) { // since this type check failed for an exact type we know that it can never // succeed at run time. we also don't care about null values, since they will // also make the check fail. return LogicConstantNode.contradiction(graph()); } else { boolean superType = stampType.isAssignableFrom(type()); if (!superType && !stampType.isInterface() && !type().isInterface()) { return LogicConstantNode.contradiction(graph()); } // since the subtype comparison was only performed on a declared type we don't // really know if it might be true at run time... } } } return this; } public ValueNode object() { return object; } /** * Gets the type being tested. */ public ResolvedJavaType type() { return type; } public JavaTypeProfile profile() { return profile; } public void setProfile(JavaTypeProfile profile) { this.profile = profile; } @Override public void virtualize(VirtualizerTool tool) { State state = tool.getObjectState(object); if (state != null) { tool.replaceWithValue(LogicConstantNode.forBoolean(type().isAssignableFrom(state.getVirtualObject().type()), graph())); } } }