| /* |
| * Copyright (c) 2009, 2016, 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 org.graalvm.compiler.nodes.java; |
| |
| import static org.graalvm.compiler.nodeinfo.InputType.Anchor; |
| import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_15; |
| import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_15; |
| |
| import org.graalvm.compiler.core.common.type.ObjectStamp; |
| import org.graalvm.compiler.core.common.type.Stamp; |
| import org.graalvm.compiler.core.common.type.StampFactory; |
| import org.graalvm.compiler.core.common.type.TypeReference; |
| import org.graalvm.compiler.graph.NodeClass; |
| import org.graalvm.compiler.graph.spi.CanonicalizerTool; |
| import org.graalvm.compiler.nodeinfo.NodeInfo; |
| import org.graalvm.compiler.nodes.LogicConstantNode; |
| import org.graalvm.compiler.nodes.LogicNegationNode; |
| import org.graalvm.compiler.nodes.LogicNode; |
| import org.graalvm.compiler.nodes.UnaryOpLogicNode; |
| import org.graalvm.compiler.nodes.ValueNode; |
| import org.graalvm.compiler.nodes.calc.IsNullNode; |
| import org.graalvm.compiler.nodes.extended.AnchoringNode; |
| import org.graalvm.compiler.nodes.spi.Lowerable; |
| import org.graalvm.compiler.nodes.spi.LoweringTool; |
| import org.graalvm.compiler.nodes.spi.Virtualizable; |
| import org.graalvm.compiler.nodes.spi.VirtualizerTool; |
| import org.graalvm.compiler.nodes.type.StampTool; |
| |
| import jdk.vm.ci.meta.JavaTypeProfile; |
| import jdk.vm.ci.meta.TriState; |
| |
| /** |
| * The {@code InstanceOfNode} represents an instanceof test. |
| */ |
| @NodeInfo(cycles = CYCLES_15, size = SIZE_15) |
| public class InstanceOfNode extends UnaryOpLogicNode implements Lowerable, Virtualizable { |
| public static final NodeClass<InstanceOfNode> TYPE = NodeClass.create(InstanceOfNode.class); |
| |
| protected final ObjectStamp checkedStamp; |
| |
| private JavaTypeProfile profile; |
| @OptionalInput(Anchor) protected AnchoringNode anchor; |
| |
| private InstanceOfNode(ObjectStamp checkedStamp, ValueNode object, JavaTypeProfile profile, AnchoringNode anchor) { |
| this(TYPE, checkedStamp, object, profile, anchor); |
| } |
| |
| protected InstanceOfNode(NodeClass<? extends InstanceOfNode> c, ObjectStamp checkedStamp, ValueNode object, JavaTypeProfile profile, AnchoringNode anchor) { |
| super(c, object); |
| this.checkedStamp = checkedStamp; |
| this.profile = profile; |
| this.anchor = anchor; |
| assert (profile == null) || (anchor != null) : "profiles must be anchored"; |
| assert checkedStamp != null; |
| } |
| |
| public static LogicNode createAllowNull(TypeReference type, ValueNode object, JavaTypeProfile profile, AnchoringNode anchor) { |
| if (StampTool.isPointerNonNull(object)) { |
| return create(type, object, profile, anchor); |
| } |
| return createHelper(StampFactory.object(type), object, profile, anchor); |
| } |
| |
| public static LogicNode create(TypeReference type, ValueNode object) { |
| return create(type, object, null, null); |
| } |
| |
| public static LogicNode create(TypeReference type, ValueNode object, JavaTypeProfile profile, AnchoringNode anchor) { |
| return createHelper(StampFactory.objectNonNull(type), object, profile, anchor); |
| } |
| |
| public static LogicNode createHelper(ObjectStamp checkedStamp, ValueNode object, JavaTypeProfile profile, AnchoringNode anchor) { |
| LogicNode synonym = findSynonym(checkedStamp, object); |
| if (synonym != null) { |
| return synonym; |
| } else { |
| return new InstanceOfNode(checkedStamp, object, profile, anchor); |
| } |
| } |
| |
| @Override |
| public void lower(LoweringTool tool) { |
| tool.getLowerer().lower(this, tool); |
| } |
| |
| @Override |
| public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) { |
| LogicNode synonym = findSynonym(checkedStamp, forValue); |
| if (synonym != null) { |
| return synonym; |
| } else { |
| return this; |
| } |
| } |
| |
| public static LogicNode findSynonym(ObjectStamp checkedStamp, ValueNode object) { |
| ObjectStamp inputStamp = (ObjectStamp) object.stamp(); |
| ObjectStamp joinedStamp = (ObjectStamp) checkedStamp.join(inputStamp); |
| |
| if (joinedStamp.isEmpty()) { |
| // The check can never succeed, the intersection of the two stamps is empty. |
| return LogicConstantNode.contradiction(); |
| } else { |
| ObjectStamp meetStamp = (ObjectStamp) checkedStamp.meet(inputStamp); |
| if (checkedStamp.equals(meetStamp)) { |
| // The check will always succeed, the union of the two stamps is equal to the |
| // checked stamp. |
| return LogicConstantNode.tautology(); |
| } else if (checkedStamp.type().equals(meetStamp.type()) && checkedStamp.isExactType() == meetStamp.isExactType() && checkedStamp.alwaysNull() == meetStamp.alwaysNull()) { |
| assert checkedStamp.nonNull() != inputStamp.nonNull(); |
| // The only difference makes the null-ness of the value => simplify the check. |
| if (checkedStamp.nonNull()) { |
| return LogicNegationNode.create(IsNullNode.create(object)); |
| } else { |
| return IsNullNode.create(object); |
| } |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Gets the type being tested. |
| */ |
| public TypeReference type() { |
| return StampTool.typeReferenceOrNull(checkedStamp); |
| } |
| |
| public JavaTypeProfile profile() { |
| return profile; |
| } |
| |
| @Override |
| public void virtualize(VirtualizerTool tool) { |
| ValueNode alias = tool.getAlias(getValue()); |
| TriState fold = tryFold(alias.stamp()); |
| if (fold != TriState.UNKNOWN) { |
| tool.replaceWithValue(LogicConstantNode.forBoolean(fold.isTrue(), graph())); |
| } |
| } |
| |
| @Override |
| public Stamp getSucceedingStampForValue(boolean negated) { |
| if (negated) { |
| return null; |
| } else { |
| return checkedStamp; |
| } |
| } |
| |
| @Override |
| public TriState tryFold(Stamp valueStamp) { |
| if (valueStamp instanceof ObjectStamp) { |
| ObjectStamp inputStamp = (ObjectStamp) valueStamp; |
| ObjectStamp joinedStamp = (ObjectStamp) checkedStamp.join(inputStamp); |
| |
| if (joinedStamp.isEmpty()) { |
| // The check can never succeed, the intersection of the two stamps is empty. |
| return TriState.FALSE; |
| } else { |
| ObjectStamp meetStamp = (ObjectStamp) checkedStamp.meet(inputStamp); |
| if (checkedStamp.equals(meetStamp)) { |
| // The check will always succeed, the union of the two stamps is equal to the |
| // checked stamp. |
| return TriState.TRUE; |
| } |
| } |
| } |
| return TriState.UNKNOWN; |
| } |
| |
| public boolean allowsNull() { |
| return !checkedStamp.nonNull(); |
| } |
| |
| public void setProfile(JavaTypeProfile typeProfile, AnchoringNode anchor) { |
| this.profile = typeProfile; |
| updateUsagesInterface(this.anchor, anchor); |
| this.anchor = anchor; |
| assert (profile == null) || (anchor != null) : "profiles must be anchored"; |
| } |
| |
| public AnchoringNode getAnchor() { |
| return anchor; |
| } |
| } |
