Mercurial > hg > truffle
view graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/nodes/MethodHandleNode.java @ 21522:28cbfacd0518
Merge
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
---|---|
date | Thu, 28 May 2015 17:44:05 +0200 |
parents | graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/MethodHandleNode.java@5ea03a00828a graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/MethodHandleNode.java@331da25c2dda |
children | 47bebae7454f |
line wrap: on
line source
/* * Copyright (c) 2013, 2015, 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.replacements.nodes; import java.lang.invoke.*; import java.util.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.api.meta.Assumptions.AssumptionResult; import com.oracle.graal.api.meta.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.nodeinfo.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.CallTargetNode.InvokeKind; import com.oracle.graal.nodes.java.*; import com.oracle.graal.nodes.type.*; import com.oracle.graal.nodes.util.*; /** * Node for invocation methods defined on the class {@link MethodHandle}. */ @NodeInfo public final class MethodHandleNode extends MacroStateSplitNode implements Simplifiable { public static final NodeClass<MethodHandleNode> TYPE = NodeClass.create(MethodHandleNode.class); protected final IntrinsicMethod intrinsicMethod; public MethodHandleNode(IntrinsicMethod intrinsicMethod, InvokeKind invokeKind, ResolvedJavaMethod targetMethod, int bci, JavaType returnType, ValueNode... arguments) { super(TYPE, invokeKind, targetMethod, bci, returnType, arguments); this.intrinsicMethod = intrinsicMethod; } /** * Attempts to transform application of an intrinsifiable {@link MethodHandle} method into an * invocation on another method with possibly transformed arguments. * * @param assumptions object for recording any speculations made during the transformation * @param methodHandleAccess objects for accessing the implementation internals of a * {@link MethodHandle} * @param intrinsicMethod denotes the intrinsifiable {@link MethodHandle} method being processed * @param bci the BCI of the original {@link MethodHandle} call * @param returnType return type of the original {@link MethodHandle} call * @param arguments arguments to the original {@link MethodHandle} call * @return a more direct invocation derived from the {@link MethodHandle} call or null */ public static InvokeNode tryResolveTargetInvoke(Assumptions assumptions, MethodHandleAccessProvider methodHandleAccess, IntrinsicMethod intrinsicMethod, ResolvedJavaMethod original, int bci, JavaType returnType, ValueNode... arguments) { switch (intrinsicMethod) { case INVOKE_BASIC: return getInvokeBasicTarget(assumptions, intrinsicMethod, methodHandleAccess, original, bci, returnType, arguments); case LINK_TO_STATIC: case LINK_TO_SPECIAL: case LINK_TO_VIRTUAL: case LINK_TO_INTERFACE: return getLinkToTarget(assumptions, intrinsicMethod, methodHandleAccess, original, bci, returnType, arguments); default: throw GraalInternalError.shouldNotReachHere(); } } @Override public void simplify(SimplifierTool tool) { MethodHandleAccessProvider methodHandleAccess = tool.getConstantReflection().getMethodHandleAccess(); ValueNode[] argumentsArray = arguments.toArray(new ValueNode[arguments.size()]); InvokeNode invoke = tryResolveTargetInvoke(graph().getAssumptions(), methodHandleAccess, intrinsicMethod, targetMethod, bci, returnType, argumentsArray); if (invoke != null) { assert invoke.graph() == null; invoke = graph().addOrUniqueWithInputs(invoke); invoke.setStateAfter(stateAfter()); FixedNode currentNext = next(); replaceAtUsages(invoke); GraphUtil.removeFixedWithUnusedInputs(this); graph().addBeforeFixed(currentNext, invoke); } } /** * Get the receiver of a MethodHandle.invokeBasic call. * * @return the receiver argument node */ private static ValueNode getReceiver(ValueNode[] arguments) { return arguments[0]; } /** * Get the MemberName argument of a MethodHandle.linkTo* call. * * @return the MemberName argument node (which is the last argument) */ private static ValueNode getMemberName(ValueNode[] arguments) { return arguments[arguments.length - 1]; } /** * 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 */ private static InvokeNode getInvokeBasicTarget(Assumptions assumptions, IntrinsicMethod intrinsicMethod, MethodHandleAccessProvider methodHandleAccess, ResolvedJavaMethod original, int bci, JavaType returnType, ValueNode[] arguments) { ValueNode methodHandleNode = getReceiver(arguments); if (methodHandleNode.isConstant()) { return getTargetInvokeNode(assumptions, intrinsicMethod, bci, returnType, arguments, methodHandleAccess.resolveInvokeBasicTarget(methodHandleNode.asJavaConstant(), true), original); } 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 */ private static InvokeNode getLinkToTarget(Assumptions assumptions, IntrinsicMethod intrinsicMethod, MethodHandleAccessProvider methodHandleAccess, ResolvedJavaMethod original, int bci, JavaType returnType, ValueNode[] arguments) { ValueNode memberNameNode = getMemberName(arguments); if (memberNameNode.isConstant()) { return getTargetInvokeNode(assumptions, intrinsicMethod, bci, returnType, arguments, methodHandleAccess.resolveLinkToTarget(memberNameNode.asJavaConstant()), original); } return null; } /** * Helper function to get the {@link InvokeNode} for the targetMethod of a * java.lang.invoke.MemberName. * * @param target the target, already loaded from the member name node * @return invoke node for the member name target */ private static InvokeNode getTargetInvokeNode(Assumptions assumptions, IntrinsicMethod intrinsicMethod, int bci, JavaType returnType, ValueNode[] arguments, ResolvedJavaMethod target, ResolvedJavaMethod original) { if (target == 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 = target.getSignature(); final boolean isStatic = target.isStatic(); final int receiverSkip = isStatic ? 0 : 1; // Cast receiver to its type. if (!isStatic) { JavaType receiverType = target.getDeclaringClass(); maybeCastArgument(arguments, 0, receiverType); } // Cast reference arguments to its type. for (int index = 0; index < signature.getParameterCount(false); index++) { JavaType parameterType = signature.getParameterType(index, target.getDeclaringClass()); maybeCastArgument(arguments, receiverSkip + index, parameterType); } if (target.canBeStaticallyBound()) { return createTargetInvokeNode(intrinsicMethod, target, original, bci, returnType, arguments); } // Try to get the most accurate receiver type if (intrinsicMethod == IntrinsicMethod.LINK_TO_VIRTUAL || intrinsicMethod == IntrinsicMethod.LINK_TO_INTERFACE) { ValueNode receiver = getReceiver(arguments); ResolvedJavaType receiverType = StampTool.typeOrNull(receiver.stamp()); if (receiverType != null) { AssumptionResult<ResolvedJavaMethod> concreteMethod = receiverType.findUniqueConcreteMethod(target); if (concreteMethod != null) { assumptions.record(concreteMethod); return createTargetInvokeNode(intrinsicMethod, concreteMethod.getResult(), original, bci, returnType, arguments); } } } else { AssumptionResult<ResolvedJavaMethod> concreteMethod = target.getDeclaringClass().findUniqueConcreteMethod(target); if (concreteMethod != null) { assumptions.record(concreteMethod); return createTargetInvokeNode(intrinsicMethod, concreteMethod.getResult(), original, bci, returnType, arguments); } } 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 static void maybeCastArgument(ValueNode[] arguments, int index, JavaType type) { if (type instanceof ResolvedJavaType) { ResolvedJavaType targetType = (ResolvedJavaType) type; if (!targetType.isPrimitive()) { ValueNode argument = arguments[index]; ResolvedJavaType argumentType = StampTool.typeOrNull(argument.stamp()); if (argumentType == null || (argumentType.isAssignableFrom(targetType) && !argumentType.equals(targetType))) { PiNode piNode = new PiNode(argument, StampFactory.declared(targetType)); arguments[index] = piNode; } } } } /** * Creates an {@link InvokeNode} for the given target method. The {@link CallTargetNode} passed * to the InvokeNode is in fact a {@link ResolvedMethodHandleCallTargetNode}. * * @return invoke node for the member name target */ private static InvokeNode createTargetInvokeNode(IntrinsicMethod intrinsicMethod, ResolvedJavaMethod target, ResolvedJavaMethod original, int bci, JavaType returnType, ValueNode[] arguments) { InvokeKind targetInvokeKind = target.isStatic() ? InvokeKind.Static : InvokeKind.Special; JavaType targetReturnType = target.getSignature().getReturnType(null); // MethodHandleLinkTo* nodes have a trailing MemberName argument which // needs to be popped. ValueNode[] targetArguments; switch (intrinsicMethod) { case INVOKE_BASIC: targetArguments = arguments; break; case LINK_TO_STATIC: case LINK_TO_SPECIAL: case LINK_TO_VIRTUAL: case LINK_TO_INTERFACE: targetArguments = Arrays.copyOfRange(arguments, 0, arguments.length - 1); break; default: throw GraalInternalError.shouldNotReachHere(); } MethodCallTargetNode callTarget = ResolvedMethodHandleCallTargetNode.create(targetInvokeKind, target, targetArguments, targetReturnType, original, arguments, returnType); // 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). if (returnType.getKind() == Kind.Void) { return new InvokeNode(callTarget, bci, StampFactory.forVoid()); } else { return new InvokeNode(callTarget, bci); } } }