Mercurial > hg > graal-jvmci-8
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/MethodHandleNode.java @ 16328:34ac3ddfd5ac
[SPARC] fixing findbug warnings
author | Stefan Anzinger <stefan.anzinger@gmail.com> |
---|---|
date | Mon, 30 Jun 2014 17:27:35 +0200 |
parents | graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/AbstractMethodHandleNode.java@96bb07a5d667 |
children | 281c30cf1952 |
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/* * Copyright (c) 2013, 2014, 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.hotspot.replacements; import static com.oracle.graal.hotspot.HotSpotGraalRuntime.*; import java.lang.invoke.*; import java.util.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.api.replacements.*; import com.oracle.graal.api.replacements.MethodHandleAccessProvider.IntrinsicMethod; import com.oracle.graal.compiler.common.*; import com.oracle.graal.compiler.common.type.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.java.*; import com.oracle.graal.nodes.java.MethodCallTargetNode.InvokeKind; import com.oracle.graal.nodes.type.*; import com.oracle.graal.nodes.util.*; import com.oracle.graal.replacements.nodes.*; /** * Node for invocation methods defined on the class {@link MethodHandle}. */ public class MethodHandleNode extends MacroNode implements Simplifiable { /** The method that this node is representing. */ private final IntrinsicMethod intrinsicMethod; // Replacement method data private ResolvedJavaMethod replacementTargetMethod; private JavaType replacementReturnType; @Input private final NodeInputList<ValueNode> replacementArguments; public MethodHandleNode(Invoke invoke) { super(invoke); MethodCallTargetNode callTarget = (MethodCallTargetNode) invoke.callTarget(); intrinsicMethod = lookupMethodHandleIntrinsic(callTarget.targetMethod()); assert intrinsicMethod != null; // See if we need to save some replacement method data. if (callTarget instanceof SelfReplacingMethodCallTargetNode) { SelfReplacingMethodCallTargetNode selfReplacingMethodCallTargetNode = (SelfReplacingMethodCallTargetNode) callTarget; replacementTargetMethod = selfReplacingMethodCallTargetNode.replacementTargetMethod(); replacementReturnType = selfReplacingMethodCallTargetNode.replacementReturnType(); replacementArguments = selfReplacingMethodCallTargetNode.replacementArguments(); } else { // NodeInputList can't be null. replacementArguments = new NodeInputList<>(this); } } /** * Returns the method handle method intrinsic identifier for the provided method, or * {@code null} if the method is not a method that can be handled by this class. */ public static IntrinsicMethod lookupMethodHandleIntrinsic(ResolvedJavaMethod method) { return methodHandleAccess().lookupMethodHandleIntrinsic(method); } @Override public void simplify(SimplifierTool tool) { InvokeNode invoke; switch (intrinsicMethod) { case INVOKE_BASIC: invoke = getInvokeBasicTarget(); break; case LINK_TO_STATIC: case LINK_TO_SPECIAL: case LINK_TO_VIRTUAL: case LINK_TO_INTERFACE: invoke = getLinkToTarget(); break; default: throw GraalInternalError.shouldNotReachHere(); } if (invoke != null) { FixedNode next = next(); replaceAtUsages(invoke); GraphUtil.removeFixedWithUnusedInputs(this); graph().addBeforeFixed(next, invoke); } } /** * Get the receiver of a MethodHandle.invokeBasic call. * * @return the receiver argument node */ private ValueNode getReceiver() { return arguments.first(); } /** * Get the MemberName argument of a MethodHandle.linkTo* call. * * @return the MemberName argument node (which is the last argument) */ private ValueNode getMemberName() { return arguments.last(); } /** * Returns the {@link MethodHandleAccessProvider} that provides introspection of internal * {@link MethodHandle} data. */ private static MethodHandleAccessProvider methodHandleAccess() { return runtime().getHostProviders().getMethodHandleAccess(); } /** * Used for the MethodHandle.invokeBasic method (the {@link IntrinsicMethod#INVOKE_BASIC } * method) to get the target {@link InvokeNode} if the method handle receiver is constant. * * @return invoke node for the {@link java.lang.invoke.MethodHandle} target */ protected InvokeNode getInvokeBasicTarget() { ValueNode methodHandleNode = getReceiver(); if (methodHandleNode.isConstant()) { return getTargetInvokeNode(methodHandleAccess().resolveInvokeBasicTarget(methodHandleNode.asConstant(), false)); } return null; } /** * Used for the MethodHandle.linkTo* methods (the {@link IntrinsicMethod#LINK_TO_STATIC}, * {@link IntrinsicMethod#LINK_TO_SPECIAL}, {@link IntrinsicMethod#LINK_TO_VIRTUAL}, and * {@link IntrinsicMethod#LINK_TO_INTERFACE} methods) to get the target {@link InvokeNode} if * the member name argument is constant. * * @return invoke node for the member name target */ protected InvokeNode getLinkToTarget() { ValueNode memberNameNode = getMemberName(); if (memberNameNode.isConstant()) { return getTargetInvokeNode(methodHandleAccess().resolveLinkToTarget(memberNameNode.asConstant())); } return null; } /** * Helper function to get the {@link InvokeNode} for the targetMethod of a * java.lang.invoke.MemberName. * * @param targetMethod the target, already loaded from the member name node * @return invoke node for the member name target */ private InvokeNode getTargetInvokeNode(ResolvedJavaMethod targetMethod) { if (targetMethod == null) { return null; } // In lambda forms we erase signature types to avoid resolving issues // involving class loaders. When we optimize a method handle invoke // to a direct call we must cast the receiver and arguments to its // actual types. Signature signature = targetMethod.getSignature(); final boolean isStatic = targetMethod.isStatic(); final int receiverSkip = isStatic ? 0 : 1; // Cast receiver to its type. if (!isStatic) { JavaType receiverType = targetMethod.getDeclaringClass(); maybeCastArgument(0, receiverType); } // Cast reference arguments to its type. for (int index = 0; index < signature.getParameterCount(false); index++) { JavaType parameterType = signature.getParameterType(index, targetMethod.getDeclaringClass()); maybeCastArgument(receiverSkip + index, parameterType); } // Try to get the most accurate receiver type if (intrinsicMethod == IntrinsicMethod.LINK_TO_VIRTUAL || intrinsicMethod == IntrinsicMethod.LINK_TO_INTERFACE) { ResolvedJavaType receiverType = StampTool.typeOrNull(getReceiver().stamp()); if (receiverType != null) { ResolvedJavaMethod concreteMethod = receiverType.findUniqueConcreteMethod(targetMethod); if (concreteMethod != null) { return createTargetInvokeNode(concreteMethod); } } } if (targetMethod.canBeStaticallyBound()) { return createTargetInvokeNode(targetMethod); } ResolvedJavaMethod concreteMethod = targetMethod.getDeclaringClass().findUniqueConcreteMethod(targetMethod); if (concreteMethod != null) { return createTargetInvokeNode(concreteMethod); } return null; } /** * Inserts a node to cast the argument at index to the given type if the given type is more * concrete than the argument type. * * @param index of the argument to be cast * @param type the type the argument should be cast to */ private void maybeCastArgument(int index, JavaType type) { if (type instanceof ResolvedJavaType) { ResolvedJavaType targetType = (ResolvedJavaType) type; if (!targetType.isPrimitive()) { ValueNode argument = arguments.get(index); ResolvedJavaType argumentType = StampTool.typeOrNull(argument.stamp()); if (argumentType == null || (argumentType.isAssignableFrom(targetType) && !argumentType.equals(targetType))) { PiNode piNode = graph().unique(new PiNode(argument, StampFactory.declared(targetType))); arguments.set(index, piNode); } } } } /** * Creates an {@link InvokeNode} for the given target method. The {@link CallTargetNode} passed * to the InvokeNode is in fact a {@link SelfReplacingMethodCallTargetNode}. * * @param targetMethod the method the be called * @return invoke node for the member name target */ private InvokeNode createTargetInvokeNode(ResolvedJavaMethod targetMethod) { InvokeKind invokeKind = targetMethod.isStatic() ? InvokeKind.Static : InvokeKind.Special; JavaType returnType = targetMethod.getSignature().getReturnType(null); // MethodHandleLinkTo* nodes have a trailing MemberName argument which // needs to be popped. ValueNode[] originalArguments = arguments.toArray(new ValueNode[arguments.size()]); ValueNode[] targetArguments; switch (intrinsicMethod) { case INVOKE_BASIC: targetArguments = originalArguments; break; case LINK_TO_STATIC: case LINK_TO_SPECIAL: case LINK_TO_VIRTUAL: case LINK_TO_INTERFACE: targetArguments = Arrays.copyOfRange(originalArguments, 0, arguments.size() - 1); break; default: throw GraalInternalError.shouldNotReachHere(); } // If there is already replacement information, use that instead. MethodCallTargetNode callTarget; if (replacementTargetMethod == null) { callTarget = new SelfReplacingMethodCallTargetNode(invokeKind, targetMethod, targetArguments, returnType, getTargetMethod(), originalArguments, getReturnType()); } else { ValueNode[] args = replacementArguments.toArray(new ValueNode[replacementArguments.size()]); callTarget = new SelfReplacingMethodCallTargetNode(invokeKind, targetMethod, targetArguments, returnType, replacementTargetMethod, args, replacementReturnType); } graph().add(callTarget); // The call target can have a different return type than the invoker, // e.g. the target returns an Object but the invoker void. In this case // we need to use the stamp of the invoker. Note: always using the // invoker's stamp would be wrong because it's a less concrete type // (usually java.lang.Object). InvokeNode invoke; if (stamp() == StampFactory.forVoid()) { invoke = new InvokeNode(callTarget, getBci(), stamp()); } else { invoke = new InvokeNode(callTarget, getBci()); } graph().add(invoke); invoke.setStateAfter(stateAfter()); return invoke; } }