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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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 * 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).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package org.graalvm.compiler.nodes.java;

import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_32;
import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_32;

import org.graalvm.compiler.core.common.type.Stamp;
import org.graalvm.compiler.core.common.type.TypeReference;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.graph.spi.Canonicalizable;
import org.graalvm.compiler.graph.spi.CanonicalizerTool;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.BinaryOpLogicNode;
import org.graalvm.compiler.nodes.LogicConstantNode;
import org.graalvm.compiler.nodes.LogicNode;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.calc.IsNullNode;
import org.graalvm.compiler.nodes.spi.Lowerable;

import jdk.vm.ci.meta.Assumptions;
import jdk.vm.ci.meta.ConstantReflectionProvider;
import jdk.vm.ci.meta.JavaKind;
import jdk.vm.ci.meta.ResolvedJavaType;
import jdk.vm.ci.meta.TriState;

The InstanceOfDynamicNode represents a type check where the type being checked is not known at compile time. This is used, for instance, to intrinsify Class.isInstance(Object) .
/** * The {@code InstanceOfDynamicNode} represents a type check where the type being checked is not * known at compile time. This is used, for instance, to intrinsify {@link Class#isInstance(Object)} * . */
@NodeInfo(cycles = CYCLES_32, size = SIZE_32) public class InstanceOfDynamicNode extends BinaryOpLogicNode implements Canonicalizable.Binary<ValueNode>, Lowerable { public static final NodeClass<InstanceOfDynamicNode> TYPE = NodeClass.create(InstanceOfDynamicNode.class); private final boolean allowNull; private final boolean exact; public static LogicNode create(Assumptions assumptions, ConstantReflectionProvider constantReflection, ValueNode mirror, ValueNode object, boolean allowNull, boolean exact) { LogicNode synonym = findSynonym(assumptions, constantReflection, mirror, object, allowNull, exact); if (synonym != null) { return synonym; } return new InstanceOfDynamicNode(mirror, object, allowNull, exact); } public static LogicNode create(Assumptions assumptions, ConstantReflectionProvider constantReflection, ValueNode mirror, ValueNode object, boolean allowNull) { return create(assumptions, constantReflection, mirror, object, allowNull, false); } protected InstanceOfDynamicNode(ValueNode mirror, ValueNode object, boolean allowNull, boolean exact) { super(TYPE, mirror, object); this.allowNull = allowNull; this.exact = exact; assert mirror.getStackKind() == JavaKind.Object || mirror.getStackKind() == JavaKind.Illegal : mirror.getStackKind(); } private static LogicNode findSynonym(Assumptions assumptions, ConstantReflectionProvider constantReflection, ValueNode forMirror, ValueNode forObject, boolean allowNull, boolean exact) { if (forMirror.isConstant()) { ResolvedJavaType t = constantReflection.asJavaType(forMirror.asConstant()); if (t != null) { if (t.isPrimitive()) { if (allowNull) { return IsNullNode.create(forObject); } else { return LogicConstantNode.contradiction(); } } else { TypeReference type = exact ? TypeReference.createExactTrusted(t) : TypeReference.createTrusted(assumptions, t); if (allowNull) { return InstanceOfNode.createAllowNull(type, forObject, null, null); } else { return InstanceOfNode.create(type, forObject); } } } } return null; } public ValueNode getMirrorOrHub() { return this.getX(); } public ValueNode getObject() { return this.getY(); } @Override public LogicNode canonical(CanonicalizerTool tool, ValueNode forMirror, ValueNode forObject) { LogicNode result = findSynonym(tool.getAssumptions(), tool.getConstantReflection(), forMirror, forObject, allowNull, exact); if (result != null) { return result; } return this; } public void setMirror(ValueNode newObject) { this.updateUsages(x, newObject); this.x = newObject; } public boolean allowsNull() { return allowNull; } public boolean isExact() { return exact; } @Override public Stamp getSucceedingStampForX(boolean negated, Stamp xStamp, Stamp yStamp) { return null; } @Override public Stamp getSucceedingStampForY(boolean negated, Stamp xStamp, Stamp yStamp) { return null; } @Override public TriState tryFold(Stamp xStamp, Stamp yStamp) { return TriState.UNKNOWN; } }