1 /* 2 * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.graalvm.compiler.replacements.nodes; 24 25 import java.lang.invoke.MethodHandle; 26 27 import org.graalvm.compiler.core.common.type.StampPair; 28 import org.graalvm.compiler.debug.GraalError; 29 import org.graalvm.compiler.graph.NodeClass; 30 import org.graalvm.compiler.graph.NodeInputList; 31 import org.graalvm.compiler.nodeinfo.NodeInfo; 32 import org.graalvm.compiler.nodes.ValueNode; 33 import org.graalvm.compiler.nodes.java.MethodCallTargetNode; 34 import org.graalvm.compiler.nodes.spi.Lowerable; 35 import org.graalvm.compiler.nodes.spi.LoweringTool; 36 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; 37 38 import jdk.vm.ci.meta.ResolvedJavaMethod; 39 40 /** 41 * A call target that replaces itself in the graph when being lowered by restoring the original 42 * {@link MethodHandle} invocation target. Prior to 43 * https://bugs.openjdk.java.net/browse/JDK-8072008, this is required for when a 44 * {@link MethodHandle} call is resolved to a constant target but the target was not inlined. In 45 * that case, the original invocation must be restored with all of its original arguments. Why? 46 * HotSpot linkage for {@link MethodHandle} intrinsics (see 47 * {@code MethodHandles::generate_method_handle_dispatch}) expects certain implicit arguments to be 48 * on the stack such as the MemberName suffix argument for a call to one of the MethodHandle.linkTo* 49 * methods. An {@linkplain MethodHandleNode#tryResolveTargetInvoke resolved} {@link MethodHandle} 50 * invocation drops these arguments which means the interpreter won't find them. 51 */ 52 @NodeInfo 53 public final class ResolvedMethodHandleCallTargetNode extends MethodCallTargetNode implements Lowerable { 54 55 public static final NodeClass<ResolvedMethodHandleCallTargetNode> TYPE = NodeClass.create(ResolvedMethodHandleCallTargetNode.class); 56 57 /** 58 * Creates a call target for an invocation on a direct target derived by resolving a constant 59 * {@link MethodHandle}. 60 */ 61 public static MethodCallTargetNode create(InvokeKind invokeKind, ResolvedJavaMethod targetMethod, ValueNode[] arguments, StampPair returnStamp, 62 ResolvedJavaMethod originalTargetMethod, 63 ValueNode[] originalArguments, StampPair originalReturnStamp) { 64 return new ResolvedMethodHandleCallTargetNode(invokeKind, targetMethod, arguments, returnStamp, originalTargetMethod, originalArguments, originalReturnStamp); 65 } 66 67 protected final ResolvedJavaMethod originalTargetMethod; 68 protected final StampPair originalReturnStamp; 69 @Input NodeInputList<ValueNode> originalArguments; 70 71 protected ResolvedMethodHandleCallTargetNode(InvokeKind invokeKind, ResolvedJavaMethod targetMethod, ValueNode[] arguments, StampPair returnStamp, 72 ResolvedJavaMethod originalTargetMethod, 73 ValueNode[] originalArguments, StampPair originalReturnStamp) { 74 super(TYPE, invokeKind, targetMethod, arguments, returnStamp, null); 75 this.originalTargetMethod = originalTargetMethod; 76 this.originalReturnStamp = originalReturnStamp; 77 this.originalArguments = new NodeInputList<>(this, originalArguments); 78 } 79 80 @Override 81 public void lower(LoweringTool tool) { 82 InvokeKind replacementInvokeKind = originalTargetMethod.isStatic() ? InvokeKind.Static : InvokeKind.Special; 83 MethodCallTargetNode replacement = graph().add( 84 new MethodCallTargetNode(replacementInvokeKind, originalTargetMethod, originalArguments.toArray(new ValueNode[originalArguments.size()]), originalReturnStamp, null)); 85 86 // Replace myself... 87 this.replaceAndDelete(replacement); 88 } 89 90 @Override 91 public void generate(NodeLIRBuilderTool gen) { 92 throw GraalError.shouldNotReachHere("should have replaced itself"); 93 } 94 }