author | jrose |
Sat, 16 Jul 2011 15:47:53 -0700 | |
changeset 10082 | 761643c9bebd |
parent 9752 | 88ab34b6da6d |
child 10419 | 12c063b39232 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008, 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.empty.Empty; |
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import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP; |
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/** |
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* Construction and caching of often-used invokers. |
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* @author jrose |
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*/ |
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class Invokers { |
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// exact type (sans leading taget MH) for the outgoing call |
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private final MethodType targetType; |
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// exact invoker for the outgoing call |
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private /*lazy*/ MethodHandle exactInvoker; |
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// erased (partially untyped but with primitives) invoker for the outgoing call |
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private /*lazy*/ MethodHandle erasedInvoker; |
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/*lazy*/ MethodHandle erasedInvokerWithDrops; // for InvokeGeneric |
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// general invoker for the outgoing call |
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private /*lazy*/ MethodHandle generalInvoker; |
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// general invoker for the outgoing call, uses varargs |
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private /*lazy*/ MethodHandle varargsInvoker; |
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// general invoker for the outgoing call; accepts a trailing Object[] |
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private final /*lazy*/ MethodHandle[] spreadInvokers; |
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// invoker for an unbound callsite |
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private /*lazy*/ MethodHandle uninitializedCallSite; |
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/** Compute and cache information common to all collecting adapters |
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* that implement members of the erasure-family of the given erased type. |
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*/ |
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/*non-public*/ Invokers(MethodType targetType) { |
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this.targetType = targetType; |
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this.spreadInvokers = new MethodHandle[targetType.parameterCount()+1]; |
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} |
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/*non-public*/ static MethodType invokerType(MethodType targetType) { |
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return targetType.insertParameterTypes(0, MethodHandle.class); |
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} |
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/*non-public*/ MethodHandle exactInvoker() { |
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MethodHandle invoker = exactInvoker; |
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if (invoker != null) return invoker; |
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invoker = lookupInvoker("invokeExact"); |
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exactInvoker = invoker; |
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return invoker; |
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} |
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/*non-public*/ MethodHandle generalInvoker() { |
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MethodHandle invoker = generalInvoker; |
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if (invoker != null) return invoker; |
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invoker = lookupInvoker("invoke"); |
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generalInvoker = invoker; |
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return invoker; |
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} |
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private MethodHandle lookupInvoker(String name) { |
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MethodHandle invoker; |
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try { |
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invoker = IMPL_LOOKUP.findVirtual(MethodHandle.class, name, targetType); |
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} catch (ReflectiveOperationException ex) { |
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throw new InternalError("JVM cannot find invoker for "+targetType); |
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} |
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assert(invokerType(targetType) == invoker.type()); |
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assert(!invoker.isVarargsCollector()); |
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return invoker; |
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} |
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/*non-public*/ MethodHandle erasedInvoker() { |
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MethodHandle xinvoker = exactInvoker(); |
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MethodHandle invoker = erasedInvoker; |
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if (invoker != null) return invoker; |
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MethodType erasedType = targetType.erase(); |
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invoker = xinvoker.asType(invokerType(erasedType)); |
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erasedInvoker = invoker; |
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return invoker; |
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} |
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/*non-public*/ MethodHandle spreadInvoker(int leadingArgCount) { |
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MethodHandle vaInvoker = spreadInvokers[leadingArgCount]; |
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if (vaInvoker != null) return vaInvoker; |
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MethodHandle gInvoker = generalInvoker(); |
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int spreadArgCount = targetType.parameterCount() - leadingArgCount; |
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vaInvoker = gInvoker.asSpreader(Object[].class, spreadArgCount); |
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spreadInvokers[leadingArgCount] = vaInvoker; |
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return vaInvoker; |
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} |
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/*non-public*/ MethodHandle varargsInvoker() { |
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MethodHandle vaInvoker = varargsInvoker; |
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if (vaInvoker != null) return vaInvoker; |
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vaInvoker = spreadInvoker(0).asType(invokerType(MethodType.genericMethodType(0, true))); |
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varargsInvoker = vaInvoker; |
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return vaInvoker; |
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} |
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private static MethodHandle THROW_UCS = null; |
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/*non-public*/ MethodHandle uninitializedCallSite() { |
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MethodHandle invoker = uninitializedCallSite; |
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if (invoker != null) return invoker; |
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if (targetType.parameterCount() > 0) { |
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MethodType type0 = targetType.dropParameterTypes(0, targetType.parameterCount()); |
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Invokers invokers0 = type0.invokers(); |
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invoker = MethodHandles.dropArguments(invokers0.uninitializedCallSite(), |
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0, targetType.parameterList()); |
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assert(invoker.type().equals(targetType)); |
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uninitializedCallSite = invoker; |
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return invoker; |
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} |
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if (THROW_UCS == null) { |
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try { |
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THROW_UCS = IMPL_LOOKUP |
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.findStatic(CallSite.class, "uninitializedCallSite", |
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MethodType.methodType(Empty.class)); |
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} catch (ReflectiveOperationException ex) { |
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throw new RuntimeException(ex); |
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} |
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} |
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invoker = AdapterMethodHandle.makeRetypeRaw(targetType, THROW_UCS); |
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assert(invoker.type().equals(targetType)); |
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uninitializedCallSite = invoker; |
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return invoker; |
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} |
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|
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public String toString() { |
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return "Invokers"+targetType; |
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} |
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} |