John R Rose | fb6164c | 2009-05-05 22:40:09 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2008-2009 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.dyn; |
| 27 | |
| 28 | import java.dyn.MethodHandle; |
| 29 | import java.dyn.MethodHandles; |
| 30 | import java.dyn.MethodType; |
| 31 | |
| 32 | |
| 33 | /** |
| 34 | * Construction and caching of often-used invokers. |
| 35 | * @author jrose |
| 36 | */ |
| 37 | public class Invokers { |
| 38 | // exact type (sans leading taget MH) for the outgoing call |
| 39 | private final MethodType targetType; |
| 40 | |
| 41 | // exact invoker for the outgoing call |
| 42 | private /*lazy*/ MethodHandle exactInvoker; |
| 43 | |
| 44 | // generic (untyped) invoker for the outgoing call |
| 45 | private /*lazy*/ MethodHandle genericInvoker; |
| 46 | |
| 47 | /** Compute and cache information common to all collecting adapters |
| 48 | * that implement members of the erasure-family of the given erased type. |
| 49 | */ |
| 50 | public Invokers(Access token, MethodType targetType) { |
| 51 | Access.check(token); |
| 52 | this.targetType = targetType; |
| 53 | } |
| 54 | |
| 55 | public static MethodType invokerType(MethodType targetType) { |
| 56 | return targetType.insertParameterType(0, MethodHandle.class); |
| 57 | } |
| 58 | |
| 59 | public MethodHandle exactInvoker() { |
| 60 | MethodHandle invoker = exactInvoker; |
| 61 | if (invoker != null) return invoker; |
| 62 | invoker = MethodHandleImpl.IMPL_LOOKUP.findVirtual(MethodHandle.class, "invoke", targetType); |
| 63 | if (invoker == null) throw new InternalError("JVM cannot find invoker for "+targetType); |
| 64 | assert(invokerType(targetType) == invoker.type()); |
| 65 | exactInvoker = invoker; |
| 66 | return invoker; |
| 67 | } |
| 68 | |
| 69 | public MethodHandle genericInvoker() { |
| 70 | MethodHandle invoker1 = exactInvoker(); |
| 71 | MethodHandle invoker = genericInvoker; |
| 72 | if (invoker != null) return invoker; |
| 73 | MethodType genericType = targetType.generic(); |
| 74 | invoker = MethodHandles.convertArguments(invoker1, invokerType(genericType)); |
| 75 | genericInvoker = invoker; |
| 76 | return invoker; |
| 77 | } |
| 78 | |
| 79 | public MethodHandle varargsInvoker() { |
| 80 | throw new UnsupportedOperationException("NYI"); |
| 81 | } |
| 82 | |
| 83 | public String toString() { |
| 84 | return "Invokers"+targetType; |
| 85 | } |
| 86 | } |