Mercurial > hg > Members > kono > jpf-core
diff src/peers/gov/nasa/jpf/vm/AtomicFieldUpdater.java @ 0:61d41facf527
initial v8 import (history reset)
author | Peter Mehlitz <Peter.C.Mehlitz@nasa.gov> |
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date | Fri, 23 Jan 2015 10:14:01 -0800 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/peers/gov/nasa/jpf/vm/AtomicFieldUpdater.java Fri Jan 23 10:14:01 2015 -0800 @@ -0,0 +1,48 @@ +/* + * Copyright (C) 2014, United States Government, as represented by the + * Administrator of the National Aeronautics and Space Administration. + * All rights reserved. + * + * The Java Pathfinder core (jpf-core) platform is licensed under the + * Apache License, Version 2.0 (the "License"); you may not use this file except + * in compliance with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0. + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package gov.nasa.jpf.vm; + +/** + * base class for atomic field updaters + */ +public class AtomicFieldUpdater extends NativePeer { + + + protected FieldInfo getFieldInfo (ElementInfo eiUpdater, ElementInfo eiTarget){ + int fidx = eiUpdater.getIntField("fieldId"); + return eiTarget.getClassInfo().getInstanceField(fidx); + } + + /** + * note - we are not interested in sharedness/interleaving of the AtomicUpdater object + * but in the object that is accessed by the updater + */ + protected boolean reschedulesAccess (ThreadInfo ti, ElementInfo ei, FieldInfo fi){ + Scheduler scheduler = ti.getScheduler(); + Instruction insn = ti.getPC(); + + if (scheduler.canHaveSharedObjectCG( ti, insn, ei, fi)){ + ei = scheduler.updateObjectSharedness( ti, ei, fi); + return scheduler.setsSharedObjectCG( ti, insn, ei, fi); + } + + return false; + } + +}