Mercurial > hg > Members > kono > jpf-core
view src/main/gov/nasa/jpf/vm/bytecode/InstanceFieldInstruction.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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/* * 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.bytecode; import gov.nasa.jpf.vm.ClassInfo; import gov.nasa.jpf.vm.ClassLoaderInfo; import gov.nasa.jpf.vm.ElementInfo; import gov.nasa.jpf.vm.FieldInfo; import gov.nasa.jpf.vm.MJIEnv; import gov.nasa.jpf.vm.StackFrame; import gov.nasa.jpf.vm.ThreadInfo; import gov.nasa.jpf.vm.VM; /** * common machine independent type for all instance field access instructions */ public abstract class InstanceFieldInstruction extends FieldInstruction { protected int lastThis = MJIEnv.NULL; protected InstanceFieldInstruction (String fieldName, String classType, String fieldDescriptor){ super(fieldName, classType, fieldDescriptor); } public abstract int getObjectSlot (StackFrame frame); @Override public ElementInfo getElementInfo (ThreadInfo ti){ if (isCompleted(ti)){ return ti.getElementInfo(lastThis); } else { return peekElementInfo(ti); } } @Override public String toPostExecString(){ StringBuilder sb = new StringBuilder(); sb.append(getMnemonic()); sb.append(' '); sb.append( getLastElementInfo()); sb.append('.'); sb.append(fname); return sb.toString(); } @Override public FieldInfo getFieldInfo () { if (fi == null) { ClassInfo ci = ClassLoaderInfo.getCurrentResolvedClassInfo(className); if (ci != null) { fi = ci.getInstanceField(fname); } } return fi; } /** * NOTE - the return value is *only* valid in a instructionExecuted() context, since * the same instruction can be executed from different threads */ public int getLastThis() { return lastThis; } /** * since this is based on getLastThis(), the same context restrictions apply */ @Override public ElementInfo getLastElementInfo () { if (lastThis != MJIEnv.NULL) { return VM.getVM().getHeap().get(lastThis); // <2do> remove - should be in clients } return null; } public String getFieldDescriptor () { ElementInfo ei = getLastElementInfo(); FieldInfo fi = getFieldInfo(); return ei.toString() + '.' + fi.getName(); } }