author | attila |
Wed, 26 Feb 2014 13:17:57 +0100 | |
changeset 24719 | f726e9d67629 |
parent 16245 | 6a1c6c8bc113 |
child 24720 | 75f8388b79df |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2010, 2013, 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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|
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/* |
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* This file is available under and governed by the GNU General Public |
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* License version 2 only, as published by the Free Software Foundation. |
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* However, the following notice accompanied the original version of this |
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* file, and Oracle licenses the original version of this file under the BSD |
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* license: |
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*/ |
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/* |
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Copyright 2009-2013 Attila Szegedi |
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|
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Licensed under both the Apache License, Version 2.0 (the "Apache License") |
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and the BSD License (the "BSD License"), with licensee being free to |
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choose either of the two at their discretion. |
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|
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You may not use this file except in compliance with either the Apache |
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License or the BSD License. |
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|
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If you choose to use this file in compliance with the Apache License, the |
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following notice applies to you: |
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|
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You may obtain a copy of the Apache License at |
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|
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http://www.apache.org/licenses/LICENSE-2.0 |
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|
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Unless required by applicable law or agreed to in writing, software |
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distributed under the License is distributed on an "AS IS" BASIS, |
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
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implied. See the License for the specific language governing |
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permissions and limitations under the License. |
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|
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If you choose to use this file in compliance with the BSD License, the |
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following notice applies to you: |
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|
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions are |
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met: |
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* Redistributions of source code must retain the above copyright |
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notice, this list of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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* Neither the name of the copyright holder nor the names of |
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contributors may be used to endorse or promote products derived from |
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this software without specific prior written permission. |
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|
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
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BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package jdk.internal.dynalink.linker; |
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import java.lang.invoke.MethodHandle; |
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import java.lang.invoke.MethodHandles; |
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import java.lang.invoke.MethodType; |
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import java.lang.invoke.SwitchPoint; |
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import java.lang.invoke.WrongMethodTypeException; |
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import java.util.List; |
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import jdk.internal.dynalink.CallSiteDescriptor; |
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import jdk.internal.dynalink.support.CatchExceptionCombinator; |
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import jdk.internal.dynalink.support.Guards; |
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import jdk.nashorn.internal.runtime.options.Options; |
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/** |
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* Represents a conditionally valid method handle. It is an immutable triple of an invocation method handle, a guard |
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* method handle that defines the applicability of the invocation handle, and a switch point that can be used for |
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* external invalidation of the invocation handle. The invocation handle is suitable for invocation if the guard |
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* handle returns true for its arguments, and as long as the switch point is not invalidated. Both the guard and the |
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* switch point are optional; neither, one, or both can be present. |
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* |
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* @author Attila Szegedi |
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*/ |
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public class GuardedInvocation { |
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private static final boolean USE_FAST_REWRITE = Options.getBooleanProperty("nashorn.fastrewrite"); |
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private final MethodHandle invocation; |
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private final MethodHandle guard; |
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private final Class<? extends Throwable> exception; |
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private final SwitchPoint switchPoint; |
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/** |
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* Creates a new guarded invocation. This invocation is unconditional as it has no invalidations. |
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* |
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* @param invocation the method handle representing the invocation. Must not be null. |
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* @throws NullPointerException if invocation is null. |
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*/ |
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public GuardedInvocation(MethodHandle invocation) { |
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this(invocation, null, null, null); |
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} |
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/** |
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* Creates a new guarded invocation. |
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* |
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* @param invocation the method handle representing the invocation. Must not be null. |
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* @param guard the method handle representing the guard. Must have the same method type as the invocation, except |
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* it must return boolean. For some useful guards, check out the {@link Guards} class. It can be null to represent |
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* an unconditional invocation, although that is unusual. |
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* @throws NullPointerException if invocation is null. |
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*/ |
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public GuardedInvocation(MethodHandle invocation, MethodHandle guard) { |
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this(invocation, guard, null, null); |
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} |
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/** |
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* Creates a new guarded invocation. |
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* |
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* @param invocation the method handle representing the invocation. Must not be null. |
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* @param switchPoint the optional switch point that can be used to invalidate this linkage. |
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* @throws NullPointerException if invocation is null. |
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*/ |
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public GuardedInvocation(MethodHandle invocation, SwitchPoint switchPoint) { |
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this(invocation, null, switchPoint, null); |
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} |
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/** |
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* Creates a new guarded invocation. |
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* |
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* @param invocation the method handle representing the invocation. Must not be null. |
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* @param guard the method handle representing the guard. Must have the same method type as the invocation, except |
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* it must return boolean. For some useful guards, check out the {@link Guards} class. It can be null. If both it |
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* and the switch point are null, this represents an unconditional invocation, which is legal but unusual. |
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* @param switchPoint the optional switch point that can be used to invalidate this linkage. |
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* @throws NullPointerException if invocation is null. |
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*/ |
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public GuardedInvocation(MethodHandle invocation, MethodHandle guard, SwitchPoint switchPoint) { |
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this(invocation, guard, switchPoint, null); |
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} |
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/** |
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* Creates a new guarded invocation. |
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* |
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* @param invocation the method handle representing the invocation. Must not be null. |
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* @param guard the method handle representing the guard. Must have the same method type as the invocation, except |
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* it must return boolean. For some useful guards, check out the {@link Guards} class. It can be null. If both it |
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* and the switch point are null, this represents an unconditional invocation, which is legal but unusual. |
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* @param switchPoint the optional switch point that can be used to invalidate this linkage. |
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* @param exception the optional exception type that is expected to be thrown by the invocation and that also |
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* invalidates the linkage. |
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* @throws NullPointerException if invocation is null. |
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*/ |
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public GuardedInvocation(MethodHandle invocation, MethodHandle guard, SwitchPoint switchPoint, Class<? extends Throwable> exception) { |
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invocation.getClass(); // NPE check |
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this.invocation = invocation; |
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this.guard = guard; |
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this.switchPoint = switchPoint; |
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this.exception = exception; |
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} |
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/** |
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* Returns the invocation method handle. |
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* |
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* @return the invocation method handle. It will never be null. |
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*/ |
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public MethodHandle getInvocation() { |
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return invocation; |
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} |
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|
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/** |
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* Returns the guard method handle. |
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* |
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* @return the guard method handle. Can be null. |
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*/ |
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public MethodHandle getGuard() { |
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return guard; |
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} |
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|
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/** |
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* Returns the switch point that can be used to invalidate the invocation handle. |
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* |
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* @return the switch point that can be used to invalidate the invocation handle. Can be null. |
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*/ |
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public SwitchPoint getSwitchPoint() { |
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return switchPoint; |
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} |
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/** |
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* Returns the exception type that if thrown should be used to invalidate the linkage. |
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* |
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* @return the exception type that if thrown should be used to invalidate the linkage. Can be null. |
|
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*/ |
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public Class<? extends Throwable> getException() { |
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return exception; |
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} |
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/** |
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* Returns true if and only if this guarded invocation has a switchpoint, and that switchpoint has been invalidated. |
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* @return true if and only if this guarded invocation has a switchpoint, and that switchpoint has been invalidated. |
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*/ |
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public boolean hasBeenInvalidated() { |
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return switchPoint != null && switchPoint.hasBeenInvalidated(); |
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} |
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|
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/** |
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* Asserts that the invocation is of the specified type, and the guard (if present) is of the specified type with a |
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* boolean return type. |
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* |
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* @param type the asserted type |
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* @throws WrongMethodTypeException if the invocation and the guard are not of the expected method type. |
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*/ |
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public void assertType(MethodType type) { |
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assertType(invocation, type); |
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if(guard != null) { |
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assertType(guard, type.changeReturnType(Boolean.TYPE)); |
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} |
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} |
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|
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/** |
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* Creates a new guarded invocation with different methods, preserving the switch point. |
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* |
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* @param newInvocation the new invocation |
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* @param newGuard the new guard |
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* @return a new guarded invocation with the replaced methods and the same switch point as this invocation. |
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*/ |
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public GuardedInvocation replaceMethods(MethodHandle newInvocation, MethodHandle newGuard) { |
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return new GuardedInvocation(newInvocation, newGuard, switchPoint, exception); |
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} |
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|
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private GuardedInvocation replaceMethodsOrThis(MethodHandle newInvocation, MethodHandle newGuard) { |
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if(newInvocation == invocation && newGuard == guard) { |
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return this; |
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} |
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return replaceMethods(newInvocation, newGuard); |
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} |
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|
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/** |
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* Changes the type of the invocation, as if {@link MethodHandle#asType(MethodType)} was applied to its invocation |
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* and its guard, if it has one (with return type changed to boolean, and parameter count potentially truncated for |
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* the guard). If the invocation already is of the required type, returns this object. |
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* @param newType the new type of the invocation. |
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* @return a guarded invocation with the new type applied to it. |
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*/ |
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public GuardedInvocation asType(MethodType newType) { |
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return replaceMethodsOrThis(invocation.asType(newType), guard == null ? null : Guards.asType(guard, newType)); |
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} |
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|
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/** |
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* Changes the type of the invocation, as if {@link LinkerServices#asType(MethodHandle, MethodType)} was applied to |
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* its invocation and its guard, if it has one (with return type changed to boolean, and parameter count potentially |
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* truncated for the guard). If the invocation already is of the required type, returns this object. |
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* @param linkerServices the linker services to use for the conversion |
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* @param newType the new type of the invocation. |
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* @return a guarded invocation with the new type applied to it. |
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*/ |
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public GuardedInvocation asType(LinkerServices linkerServices, MethodType newType) { |
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return replaceMethodsOrThis(linkerServices.asType(invocation, newType), guard == null ? null : |
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Guards.asType(linkerServices, guard, newType)); |
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} |
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|
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/** |
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* Changes the type of the invocation, as if {@link LinkerServices#asTypeLosslessReturn(MethodHandle, MethodType)} was |
284 |
* applied to its invocation and {@link LinkerServices#asType(MethodHandle, MethodType)} applied to its guard, if it |
|
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* has one (with return type changed to boolean, and parameter count potentially truncated for the guard). If the |
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* invocation doesn't change its type, returns this object. |
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* @param linkerServices the linker services to use for the conversion |
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* @param newType the new type of the invocation. |
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* @return a guarded invocation with the new type applied to it. |
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*/ |
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public GuardedInvocation asTypeSafeReturn(LinkerServices linkerServices, MethodType newType) { |
|
292 |
return replaceMethodsOrThis(linkerServices.asTypeLosslessReturn(invocation, newType), guard == null ? null : |
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Guards.asType(linkerServices, guard, newType)); |
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294 |
} |
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/** |
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* Changes the type of the invocation, as if {@link MethodHandle#asType(MethodType)} was applied to its invocation |
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* and its guard, if it has one (with return type changed to boolean for guard). If the invocation already is of the |
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* required type, returns this object. |
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* @param desc a call descriptor whose method type is adapted. |
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* @return a guarded invocation with the new type applied to it. |
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*/ |
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public GuardedInvocation asType(CallSiteDescriptor desc) { |
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return asType(desc.getMethodType()); |
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} |
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|
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/** |
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* Applies argument filters to both the invocation and the guard (if there is one). |
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* @param pos the position of the first argumen being filtered |
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* @param filters the argument filters |
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* @return a filtered invocation |
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*/ |
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public GuardedInvocation filterArguments(int pos, MethodHandle... filters) { |
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return replaceMethods(MethodHandles.filterArguments(invocation, pos, filters), guard == null ? null : |
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MethodHandles.filterArguments(guard, pos, filters)); |
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} |
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|
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/** |
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* Makes an invocation that drops arguments in both the invocation and the guard (if there is one). |
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* @param pos the position of the first argument being dropped |
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* @param valueTypes the types of the values being dropped |
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* @return an invocation that drops arguments |
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*/ |
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public GuardedInvocation dropArguments(int pos, List<Class<?>> valueTypes) { |
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return replaceMethods(MethodHandles.dropArguments(invocation, pos, valueTypes), guard == null ? null : |
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MethodHandles.dropArguments(guard, pos, valueTypes)); |
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} |
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|
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/** |
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* Makes an invocation that drops arguments in both the invocation and the guard (if there is one). |
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* @param pos the position of the first argument being dropped |
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* @param valueTypes the types of the values being dropped |
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* @return an invocation that drops arguments |
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*/ |
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public GuardedInvocation dropArguments(int pos, Class<?>... valueTypes) { |
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return replaceMethods(MethodHandles.dropArguments(invocation, pos, valueTypes), guard == null ? null : |
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MethodHandles.dropArguments(guard, pos, valueTypes)); |
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} |
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|
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|
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/** |
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* Composes the invocation, switchpoint, and the guard into a composite method handle that knows how to fall back. |
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* @param fallback the fallback method handle in case switchpoint is invalidated or guard returns false. |
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* @return a composite method handle. |
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*/ |
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public MethodHandle compose(MethodHandle fallback) { |
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return compose(fallback, fallback); |
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} |
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|
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/** |
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* Composes the invocation, switchpoint, and the guard into a composite method handle that knows how to fall back. |
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* @param switchpointFallback the fallback method handle in case switchpoint is invalidated. |
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* @param guardFallback the fallback method handle in case guard returns false. |
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* @return a composite method handle. |
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*/ |
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public MethodHandle compose(MethodHandle switchpointFallback, MethodHandle guardFallback) { |
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final MethodHandle guarded = |
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guard == null ? invocation : MethodHandles.guardWithTest(guard, invocation, guardFallback); |
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final MethodHandle catchGuarded = exception == null ? guarded : catchException(guarded, exception, |
360 |
MethodHandles.dropArguments(guardFallback, 0, exception)); |
|
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return switchPoint == null ? catchGuarded : switchPoint.guardWithTest(catchGuarded, switchpointFallback); |
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} |
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|
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private static MethodHandle catchException(final MethodHandle target, final Class<? extends Throwable> exType, final MethodHandle handler) { |
365 |
if(USE_FAST_REWRITE) { |
|
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return CatchExceptionCombinator.catchException(target, exType, handler); |
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} |
|
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return MethodHandles.catchException(target, exType, handler); |
|
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} |
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private static void assertType(MethodHandle mh, MethodType type) { |
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if(!mh.type().equals(type)) { |
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throw new WrongMethodTypeException("Expected type: " + type + " actual type: " + mh.type()); |
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} |
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} |
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} |