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/*
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* Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.graalvm.compiler.replacements.nodes;
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import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_UNKNOWN;
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import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_UNKNOWN;
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import java.lang.invoke.MethodHandle;
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import java.util.Arrays;
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import org.graalvm.compiler.core.common.type.StampFactory;
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import org.graalvm.compiler.core.common.type.StampPair;
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import org.graalvm.compiler.core.common.type.TypeReference;
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import org.graalvm.compiler.debug.GraalError;
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import org.graalvm.compiler.graph.NodeClass;
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import org.graalvm.compiler.graph.spi.Simplifiable;
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import org.graalvm.compiler.graph.spi.SimplifierTool;
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import org.graalvm.compiler.nodeinfo.NodeInfo;
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import org.graalvm.compiler.nodes.CallTargetNode;
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import org.graalvm.compiler.nodes.CallTargetNode.InvokeKind;
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import org.graalvm.compiler.nodes.FixedGuardNode;
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import org.graalvm.compiler.nodes.FixedNode;
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import org.graalvm.compiler.nodes.FixedWithNextNode;
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import org.graalvm.compiler.nodes.GuardNode;
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import org.graalvm.compiler.nodes.InvokeNode;
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import org.graalvm.compiler.nodes.LogicNode;
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import org.graalvm.compiler.nodes.NodeView;
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import org.graalvm.compiler.nodes.PiNode;
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import org.graalvm.compiler.nodes.StructuredGraph;
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import org.graalvm.compiler.nodes.ValueNode;
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import org.graalvm.compiler.nodes.extended.AnchoringNode;
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import org.graalvm.compiler.nodes.extended.GuardingNode;
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import org.graalvm.compiler.nodes.extended.ValueAnchorNode;
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import org.graalvm.compiler.nodes.java.InstanceOfNode;
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import org.graalvm.compiler.nodes.java.MethodCallTargetNode;
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import org.graalvm.compiler.nodes.type.StampTool;
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import org.graalvm.compiler.nodes.util.GraphUtil;
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import jdk.vm.ci.meta.Assumptions;
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import jdk.vm.ci.meta.Assumptions.AssumptionResult;
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import jdk.vm.ci.meta.DeoptimizationAction;
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import jdk.vm.ci.meta.DeoptimizationReason;
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import jdk.vm.ci.meta.JavaKind;
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import jdk.vm.ci.meta.JavaType;
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import jdk.vm.ci.meta.MethodHandleAccessProvider;
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import jdk.vm.ci.meta.MethodHandleAccessProvider.IntrinsicMethod;
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import jdk.vm.ci.meta.ResolvedJavaMethod;
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import jdk.vm.ci.meta.ResolvedJavaType;
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import jdk.vm.ci.meta.Signature;
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import jdk.vm.ci.meta.SpeculationLog;
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import jdk.vm.ci.meta.SpeculationLog.Speculation;
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/**
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* Node for invocation methods defined on the class {@link MethodHandle}.
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*/
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@NodeInfo(cycles = CYCLES_UNKNOWN, size = SIZE_UNKNOWN)
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public final class MethodHandleNode extends MacroStateSplitNode implements Simplifiable {
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public static final NodeClass<MethodHandleNode> TYPE = NodeClass.create(MethodHandleNode.class);
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protected final IntrinsicMethod intrinsicMethod;
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public MethodHandleNode(IntrinsicMethod intrinsicMethod, InvokeKind invokeKind, ResolvedJavaMethod targetMethod, int bci, StampPair returnStamp, ValueNode... arguments) {
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super(TYPE, invokeKind, targetMethod, bci, returnStamp, arguments);
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this.intrinsicMethod = intrinsicMethod;
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}
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/**
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* Attempts to transform application of an intrinsifiable {@link MethodHandle} method into an
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* invocation on another method with possibly transformed arguments.
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*
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* @param methodHandleAccess objects for accessing the implementation internals of a
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* {@link MethodHandle}
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* @param intrinsicMethod denotes the intrinsifiable {@link MethodHandle} method being processed
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* @param bci the BCI of the original {@link MethodHandle} call
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* @param returnStamp return stamp of the original {@link MethodHandle} call
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* @param arguments arguments to the original {@link MethodHandle} call
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* @return a more direct invocation derived from the {@link MethodHandle} call or null
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*/
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public static InvokeNode tryResolveTargetInvoke(GraphAdder adder, MethodHandleAccessProvider methodHandleAccess, IntrinsicMethod intrinsicMethod,
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ResolvedJavaMethod original, int bci,
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StampPair returnStamp, ValueNode... arguments) {
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switch (intrinsicMethod) {
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case INVOKE_BASIC:
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return getInvokeBasicTarget(adder, intrinsicMethod, methodHandleAccess, original, bci, returnStamp, arguments);
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case LINK_TO_STATIC:
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case LINK_TO_SPECIAL:
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case LINK_TO_VIRTUAL:
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case LINK_TO_INTERFACE:
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return getLinkToTarget(adder, intrinsicMethod, methodHandleAccess, original, bci, returnStamp, arguments);
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default:
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throw GraalError.shouldNotReachHere();
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}
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}
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/**
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* A simple utility class for adding nodes to the graph when building a MethodHandle invoke.
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*/
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public abstract static class GraphAdder {
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private final StructuredGraph graph;
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public GraphAdder(StructuredGraph graph) {
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this.graph = graph;
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}
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/**
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* Call {@link StructuredGraph#addOrUnique(org.graalvm.compiler.graph.Node)} on {@code node}
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* and link any {@link FixedWithNextNode}s into the current control flow.
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*
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* @param node
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* @return the newly added node
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*/
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public abstract <T extends ValueNode> T add(T node);
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/**
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* @return an {@link AnchoringNode} if floating guards should be created, otherwise
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* {@link FixedGuardNode}s will be used.
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*/
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public AnchoringNode getGuardAnchor() {
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return null;
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}
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public Assumptions getAssumptions() {
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return graph.getAssumptions();
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}
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}
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@Override
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public void simplify(SimplifierTool tool) {
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MethodHandleAccessProvider methodHandleAccess = tool.getConstantReflection().getMethodHandleAccess();
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ValueNode[] argumentsArray = arguments.toArray(new ValueNode[arguments.size()]);
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final FixedNode before = this;
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GraphAdder adder = new GraphAdder(graph()) {
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@Override
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public <T extends ValueNode> T add(T node) {
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T added = graph().addOrUnique(node);
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if (added instanceof FixedWithNextNode) {
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graph().addBeforeFixed(before, (FixedWithNextNode) added);
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}
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return added;
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}
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};
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InvokeNode invoke = tryResolveTargetInvoke(adder, methodHandleAccess, intrinsicMethod, targetMethod, bci, returnStamp, argumentsArray);
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if (invoke != null) {
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assert invoke.graph() == null;
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invoke = graph().addOrUniqueWithInputs(invoke);
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invoke.setStateAfter(stateAfter());
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FixedNode currentNext = next();
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replaceAtUsages(invoke);
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GraphUtil.removeFixedWithUnusedInputs(this);
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graph().addBeforeFixed(currentNext, invoke);
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}
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}
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/**
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* Get the receiver of a MethodHandle.invokeBasic call.
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*
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* @return the receiver argument node
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*/
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private static ValueNode getReceiver(ValueNode[] arguments) {
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return arguments[0];
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}
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/**
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* Get the MemberName argument of a MethodHandle.linkTo* call.
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*
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* @return the MemberName argument node (which is the last argument)
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*/
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private static ValueNode getMemberName(ValueNode[] arguments) {
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return arguments[arguments.length - 1];
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}
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/**
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* Used for the MethodHandle.invokeBasic method (the {@link IntrinsicMethod#INVOKE_BASIC }
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* method) to get the target {@link InvokeNode} if the method handle receiver is constant.
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*
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* @param adder
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*
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* @return invoke node for the {@link java.lang.invoke.MethodHandle} target
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*/
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private static InvokeNode getInvokeBasicTarget(GraphAdder adder, IntrinsicMethod intrinsicMethod, MethodHandleAccessProvider methodHandleAccess,
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ResolvedJavaMethod original,
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int bci,
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StampPair returnStamp, ValueNode[] arguments) {
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ValueNode methodHandleNode = getReceiver(arguments);
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if (methodHandleNode.isConstant()) {
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return getTargetInvokeNode(adder, intrinsicMethod, bci, returnStamp, arguments, methodHandleAccess.resolveInvokeBasicTarget(methodHandleNode.asJavaConstant(), true), original);
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}
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return null;
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}
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/**
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* Used for the MethodHandle.linkTo* methods (the {@link IntrinsicMethod#LINK_TO_STATIC},
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* {@link IntrinsicMethod#LINK_TO_SPECIAL}, {@link IntrinsicMethod#LINK_TO_VIRTUAL}, and
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* {@link IntrinsicMethod#LINK_TO_INTERFACE} methods) to get the target {@link InvokeNode} if
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* the member name argument is constant.
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*
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* @param adder
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*
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* @return invoke node for the member name target
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*/
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private static InvokeNode getLinkToTarget(GraphAdder adder, IntrinsicMethod intrinsicMethod, MethodHandleAccessProvider methodHandleAccess,
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ResolvedJavaMethod original,
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int bci,
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StampPair returnStamp, ValueNode[] arguments) {
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ValueNode memberNameNode = getMemberName(arguments);
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if (memberNameNode.isConstant()) {
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return getTargetInvokeNode(adder, intrinsicMethod, bci, returnStamp, arguments, methodHandleAccess.resolveLinkToTarget(memberNameNode.asJavaConstant()), original);
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}
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return null;
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}
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/**
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* Helper function to get the {@link InvokeNode} for the targetMethod of a
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* java.lang.invoke.MemberName.
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*
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* @param adder
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* @param target the target, already loaded from the member name node
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*
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* @return invoke node for the member name target
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*/
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private static InvokeNode getTargetInvokeNode(GraphAdder adder, IntrinsicMethod intrinsicMethod, int bci, StampPair returnStamp, ValueNode[] originalArguments, ResolvedJavaMethod target,
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ResolvedJavaMethod original) {
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if (target == null) {
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return null;
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}
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// In lambda forms we erase signature types to avoid resolving issues
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// involving class loaders. When we optimize a method handle invoke
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// to a direct call we must cast the receiver and arguments to its
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// actual types.
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Signature signature = target.getSignature();
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final boolean isStatic = target.isStatic();
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final int receiverSkip = isStatic ? 0 : 1;
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Assumptions assumptions = adder.getAssumptions();
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ResolvedJavaMethod realTarget = null;
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if (target.canBeStaticallyBound()) {
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realTarget = target;
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} else {
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ResolvedJavaType targetType = target.getDeclaringClass();
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// Try to bind based on the declaredType
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AssumptionResult<ResolvedJavaMethod> concreteMethod = targetType.findUniqueConcreteMethod(target);
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if (concreteMethod == null) {
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// Try to get the most accurate receiver type
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if (intrinsicMethod == IntrinsicMethod.LINK_TO_VIRTUAL || intrinsicMethod == IntrinsicMethod.LINK_TO_INTERFACE) {
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ValueNode receiver = getReceiver(originalArguments);
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TypeReference receiverType = StampTool.typeReferenceOrNull(receiver.stamp(NodeView.DEFAULT));
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if (receiverType != null) {
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concreteMethod = receiverType.getType().findUniqueConcreteMethod(target);
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}
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}
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}
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if (concreteMethod != null && concreteMethod.canRecordTo(assumptions)) {
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concreteMethod.recordTo(assumptions);
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realTarget = concreteMethod.getResult();
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}
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}
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if (realTarget != null) {
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// Don't mutate the passed in arguments
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ValueNode[] arguments = originalArguments.clone();
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// Cast receiver to its type.
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if (!isStatic) {
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JavaType receiverType = target.getDeclaringClass();
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maybeCastArgument(adder, arguments, 0, receiverType);
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}
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// Cast reference arguments to its type.
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for (int index = 0; index < signature.getParameterCount(false); index++) {
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JavaType parameterType = signature.getParameterType(index, target.getDeclaringClass());
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maybeCastArgument(adder, arguments, receiverSkip + index, parameterType);
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}
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InvokeNode invoke = createTargetInvokeNode(assumptions, intrinsicMethod, realTarget, original, bci, returnStamp, arguments);
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assert invoke != null : "graph has been modified so this must result an invoke";
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return invoke;
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}
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return null;
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}
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/**
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* Inserts a node to cast the argument at index to the given type if the given type is more
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* concrete than the argument type.
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*
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* @param adder
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* @param index of the argument to be cast
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* @param type the type the argument should be cast to
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*/
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private static void maybeCastArgument(GraphAdder adder, ValueNode[] arguments, int index, JavaType type) {
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ValueNode argument = arguments[index];
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if (type instanceof ResolvedJavaType && !((ResolvedJavaType) type).isJavaLangObject()) {
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Assumptions assumptions = adder.getAssumptions();
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TypeReference targetType = TypeReference.create(assumptions, (ResolvedJavaType) type);
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/*
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* When an argument is a Word type, we can have a mismatch of primitive/object types
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* here. Not inserting a PiNode is a safe fallback, and Word types need no additional
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* type information anyway.
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*/
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if (targetType != null && !targetType.getType().isPrimitive() && !argument.getStackKind().isPrimitive()) {
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ResolvedJavaType argumentType = StampTool.typeOrNull(argument.stamp(NodeView.DEFAULT));
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if (argumentType == null || (argumentType.isAssignableFrom(targetType.getType()) && !argumentType.equals(targetType.getType()))) {
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LogicNode inst = InstanceOfNode.createAllowNull(targetType, argument, null, null);
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assert !inst.isAlive();
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if (!inst.isTautology()) {
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inst = adder.add(inst);
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AnchoringNode guardAnchor = adder.getGuardAnchor();
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DeoptimizationReason reason = DeoptimizationReason.ClassCastException;
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DeoptimizationAction action = DeoptimizationAction.InvalidateRecompile;
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Speculation speculation = SpeculationLog.NO_SPECULATION;
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GuardingNode guard;
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if (guardAnchor == null) {
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FixedGuardNode fixedGuard = adder.add(new FixedGuardNode(inst, reason, action, speculation, false));
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guard = fixedGuard;
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} else {
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GuardNode newGuard = adder.add(new GuardNode(inst, guardAnchor, reason, action, false, speculation, null));
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adder.add(new ValueAnchorNode(newGuard));
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guard = newGuard;
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}
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ValueNode valueNode = adder.add(PiNode.create(argument, StampFactory.object(targetType), guard.asNode()));
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arguments[index] = valueNode;
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}
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}
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}
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}
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}
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/**
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* Creates an {@link InvokeNode} for the given target method. The {@link CallTargetNode} passed
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* to the InvokeNode is in fact a {@link ResolvedMethodHandleCallTargetNode}.
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*
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* @return invoke node for the member name target
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*/
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private static InvokeNode createTargetInvokeNode(Assumptions assumptions, IntrinsicMethod intrinsicMethod, ResolvedJavaMethod target, ResolvedJavaMethod original, int bci, StampPair returnStamp,
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ValueNode[] arguments) {
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|
359 |
InvokeKind targetInvokeKind = target.isStatic() ? InvokeKind.Static : InvokeKind.Special;
|
|
360 |
JavaType targetReturnType = target.getSignature().getReturnType(null);
|
|
361 |
|
|
362 |
// MethodHandleLinkTo* nodes have a trailing MemberName argument which
|
|
363 |
// needs to be popped.
|
|
364 |
ValueNode[] targetArguments;
|
|
365 |
switch (intrinsicMethod) {
|
|
366 |
case INVOKE_BASIC:
|
|
367 |
targetArguments = arguments;
|
|
368 |
break;
|
|
369 |
case LINK_TO_STATIC:
|
|
370 |
case LINK_TO_SPECIAL:
|
|
371 |
case LINK_TO_VIRTUAL:
|
|
372 |
case LINK_TO_INTERFACE:
|
|
373 |
targetArguments = Arrays.copyOfRange(arguments, 0, arguments.length - 1);
|
|
374 |
break;
|
|
375 |
default:
|
|
376 |
throw GraalError.shouldNotReachHere();
|
|
377 |
}
|
|
378 |
StampPair targetReturnStamp = StampFactory.forDeclaredType(assumptions, targetReturnType, false);
|
|
379 |
|
|
380 |
MethodCallTargetNode callTarget = ResolvedMethodHandleCallTargetNode.create(targetInvokeKind, target, targetArguments, targetReturnStamp, original, arguments, returnStamp);
|
|
381 |
|
|
382 |
// The call target can have a different return type than the invoker,
|
|
383 |
// e.g. the target returns an Object but the invoker void. In this case
|
|
384 |
// we need to use the stamp of the invoker. Note: always using the
|
|
385 |
// invoker's stamp would be wrong because it's a less concrete type
|
|
386 |
// (usually java.lang.Object).
|
|
387 |
if (returnStamp.getTrustedStamp().getStackKind() == JavaKind.Void) {
|
|
388 |
return new InvokeNode(callTarget, bci, StampFactory.forVoid());
|
|
389 |
} else {
|
|
390 |
return new InvokeNode(callTarget, bci);
|
|
391 |
}
|
|
392 |
}
|
|
393 |
}
|