87 lines
3.1 KiB
Java
87 lines
3.1 KiB
Java
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/*
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* Copyright 2008-2009 Sun Microsystems, Inc. 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. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.dyn;
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import java.dyn.MethodHandle;
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import java.dyn.MethodHandles;
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import java.dyn.MethodType;
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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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public 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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// generic (untyped) invoker for the outgoing call
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private /*lazy*/ MethodHandle genericInvoker;
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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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public Invokers(Access token, MethodType targetType) {
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Access.check(token);
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this.targetType = targetType;
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}
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public static MethodType invokerType(MethodType targetType) {
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return targetType.insertParameterType(0, MethodHandle.class);
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}
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public MethodHandle exactInvoker() {
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MethodHandle invoker = exactInvoker;
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if (invoker != null) return invoker;
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invoker = MethodHandleImpl.IMPL_LOOKUP.findVirtual(MethodHandle.class, "invoke", targetType);
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if (invoker == null) throw new InternalError("JVM cannot find invoker for "+targetType);
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assert(invokerType(targetType) == invoker.type());
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exactInvoker = invoker;
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return invoker;
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}
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public MethodHandle genericInvoker() {
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MethodHandle invoker1 = exactInvoker();
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MethodHandle invoker = genericInvoker;
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if (invoker != null) return invoker;
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MethodType genericType = targetType.generic();
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invoker = MethodHandles.convertArguments(invoker1, invokerType(genericType));
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genericInvoker = invoker;
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return invoker;
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}
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public MethodHandle varargsInvoker() {
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throw new UnsupportedOperationException("NYI");
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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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}
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