Mercurial > hg > Members > kono > jpf-core
view src/main/gov/nasa/jpf/vm/ReferenceFieldInfo.java @ 21:caa0924e093d
reshuffled Event hierarchy, introducing SystemEvent, with CheckEvent and
ControlEvent being subclasses of SystemEvent
added Loggable.setLogLevel
changed old UserHeuristic to use a Verify.heuristicValue instead of a
hardwired "Main" class with hardwired fields (which was just an outdated
leftover). Call Verify.setHeuristicValue() to control state priorities from the
SUT.
This also fixes the bug that UserHeuristic was not properly checking for
"Main" resolution.
author | Peter Mehlitz <pcmehlitz@gmail.com> |
---|---|
date | Fri, 10 Apr 2015 20:53:11 -0700 |
parents | 61d41facf527 |
children |
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/* * 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; import gov.nasa.jpf.JPFException; /** * field info for object fields */ public class ReferenceFieldInfo extends SingleSlotFieldInfo { int init; // = MJIEnv.NULL; // not required for MJIEnv.NULL = 0 String sInit; // <2do> pcm - just a temporary quirk to init from string literals // check if there are other non-object reference inits public ReferenceFieldInfo (String name, String type, int modifiers) { super(name, type, modifiers); } @Override public String valueToString (Fields f) { int i = f.getIntValue(storageOffset); if (i == MJIEnv.NULL) { return "null"; } else { return (VM.getVM().getHeap().get(i)).toString(); } } @Override public boolean isReference () { return true; } @Override public Class<? extends ChoiceGenerator<?>> getChoiceGeneratorType() { return ReferenceChoiceGenerator.class; } @Override public boolean isArrayField () { return ci.isArray; } @Override public void setConstantValue (Object constValue){ // <2do> pcm - check what other constants we might encounter, this is most // probably not just used for Strings. // Besides the type issue, there is an even bigger problem with identities. // For instance, all String refs initialized via the same string literal // inside a single classfile are in fact refering to the same object. This // means we have to keep a registry (hashtab) with string-literal created // String objects per ClassInfo, and use this when we assign or init // String references. // For the sake of progress, we ignore this for now, but have to come back // to it because it violates the VM spec if (constValue instanceof String){ cv = constValue; sInit = (String)constValue; } else { throw new JPFException ("unsupported reference initialization: " + constValue); } } @Override public void initialize (ElementInfo ei, ThreadInfo ti) { int ref = init; if (sInit != null) { VM vm = ti.getVM(); Heap heap = vm.getHeap(); ref = heap.newString(sInit, ti).getObjectRef(); } ei.getFields().setReferenceValue( storageOffset, ref); } @Override public Object getValueObject (Fields f){ int i = f.getIntValue(storageOffset); if (i == MJIEnv.NULL) { return null; } else { Heap heap = VM.getVM().getHeap(); return heap.get(i); } } }