Mercurial > hg > Members > kono > jpf-core
view src/main/gov/nasa/jpf/vm/ReferenceFieldInfo.java @ 7:b822e7665585
added a @JPFAttribute(TYPE_NAME,...) annotation for model classes (class, field and method target), which causes JPF to automatically set attribute objects that are instantiated from the provided type name args. Note that the respective attribute classes need to have a public default constructor. Added a JPFAttrAnnotationTest to show how to use it. This is the generic mechanism to use if we need to mark ClassInfos, MethodInfos and FieldInfos either from sources (using annotations), or from config files (type names/matchers used from listeners etc.) - base the processing on attributes, and set them from annotations via @JPFAttribute
Refactored MethodInfo linking to happen from Initializer.setMethodDone() so that annotations are already parsed (setMethod() is too early since none of the classfile method attributes are parsed at this point)
author | Peter Mehlitz <Peter.C.Mehlitz@nasa.gov> |
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date | Fri, 06 Feb 2015 17:28:55 -0800 |
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); } } }