author | jrose |
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parent 9730 | e4b334d47f4b |
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/* |
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* Copyright (c) 2009, 2011, 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. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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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 java.lang.invoke; |
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import sun.invoke.util.*; |
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import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP; |
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/** |
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* Adapters which manage inexact MethodHandle.invoke calls. |
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* The JVM calls one of these when the exact type match fails. |
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* @author jrose |
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*/ |
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class InvokeGeneric { |
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// erased type for the call, which originates from an inexact invoke site |
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private final MethodType erasedCallerType; |
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// an invoker of type (MT, MH; A...) -> R |
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private final MethodHandle initialInvoker; |
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/** Compute and cache information for this adapter, so that it can |
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* call out to targets of the erasure-family of the given erased type. |
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*/ |
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/*non-public*/ InvokeGeneric(MethodType erasedCallerType) throws ReflectiveOperationException { |
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assert(erasedCallerType.equals(erasedCallerType.erase())); |
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this.erasedCallerType = erasedCallerType; |
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this.initialInvoker = makeInitialInvoker(); |
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assert initialInvoker.type().equals(erasedCallerType |
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.insertParameterTypes(0, MethodType.class, MethodHandle.class)) |
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: initialInvoker.type(); |
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} |
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private static MethodHandles.Lookup lookup() { |
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return IMPL_LOOKUP; |
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} |
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/** Return the adapter information for this type's erasure. */ |
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/*non-public*/ static MethodHandle generalInvokerOf(MethodType erasedCallerType) throws ReflectiveOperationException { |
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InvokeGeneric gen = new InvokeGeneric(erasedCallerType); |
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return gen.initialInvoker; |
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} |
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private MethodHandle makeInitialInvoker() throws ReflectiveOperationException { |
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// postDispatch = #(MH'; MT, MH; A...){MH'(MT, MH; A)} |
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MethodHandle postDispatch = makePostDispatchInvoker(); |
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MethodHandle invoker; |
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if (returnConversionPossible()) { |
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invoker = MethodHandles.foldArguments(postDispatch, |
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dispatcher("dispatchWithConversion")); |
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} else { |
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invoker = MethodHandles.foldArguments(postDispatch, dispatcher("dispatch")); |
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} |
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return invoker; |
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} |
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private static final Class<?>[] EXTRA_ARGS = { MethodType.class, MethodHandle.class }; |
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private MethodHandle makePostDispatchInvoker() { |
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// Take (MH'; MT, MH; A...) and run MH'(MT, MH; A...). |
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MethodType invokerType = erasedCallerType.insertParameterTypes(0, EXTRA_ARGS); |
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return invokerType.invokers().exactInvoker(); |
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} |
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private MethodHandle dropDispatchArguments(MethodHandle targetInvoker) { |
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assert(targetInvoker.type().parameterType(0) == MethodHandle.class); |
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return MethodHandles.dropArguments(targetInvoker, 1, EXTRA_ARGS); |
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} |
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private MethodHandle dispatcher(String dispatchName) throws ReflectiveOperationException { |
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return lookup().bind(this, dispatchName, |
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MethodType.methodType(MethodHandle.class, |
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MethodType.class, MethodHandle.class)); |
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} |
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static final boolean USE_AS_TYPE_PATH = true; |
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/** Return a method handle to invoke on the callerType, target, and remaining arguments. |
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* The method handle must finish the call. |
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* This is the first look at the caller type and target. |
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*/ |
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private MethodHandle dispatch(MethodType callerType, MethodHandle target) { |
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MethodType targetType = target.type(); |
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if (USE_AS_TYPE_PATH || target.isVarargsCollector()) { |
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MethodHandle newTarget = target.asType(callerType); |
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targetType = callerType; |
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Invokers invokers = targetType.invokers(); |
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MethodHandle invoker = invokers.erasedInvokerWithDrops; |
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if (invoker == null) { |
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invokers.erasedInvokerWithDrops = invoker = |
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dropDispatchArguments(invokers.erasedInvoker()); |
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} |
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return invoker.bindTo(newTarget); |
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} |
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throw new RuntimeException("NYI"); |
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} |
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private MethodHandle dispatchWithConversion(MethodType callerType, MethodHandle target) { |
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MethodHandle finisher = dispatch(callerType, target); |
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if (returnConversionNeeded(callerType, target)) |
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finisher = addReturnConversion(finisher, callerType.returnType()); //FIXME: slow |
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return finisher; |
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} |
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private boolean returnConversionPossible() { |
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Class<?> needType = erasedCallerType.returnType(); |
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return !needType.isPrimitive(); |
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} |
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private boolean returnConversionNeeded(MethodType callerType, MethodHandle target) { |
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Class<?> needType = callerType.returnType(); |
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if (needType == erasedCallerType.returnType()) |
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return false; // no conversions possible, since must be primitive or Object |
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Class<?> haveType = target.type().returnType(); |
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if (VerifyType.isNullConversion(haveType, needType) && !needType.isInterface()) |
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return false; |
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return true; |
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} |
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private MethodHandle addReturnConversion(MethodHandle finisher, Class<?> type) { |
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// FIXME: This is slow because it creates a closure node on every call that requires a return cast. |
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MethodType finisherType = finisher.type(); |
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MethodHandle caster = ValueConversions.identity(type); |
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caster = caster.asType(caster.type().changeParameterType(0, finisherType.returnType())); |
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finisher = MethodHandles.filterReturnValue(finisher, caster); |
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return finisher.asType(finisherType); |
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} |
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|
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public String toString() { |
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return "InvokeGeneric"+erasedCallerType; |
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} |
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} |