Mercurial > hg > Members > kono > jpf-core
view src/main/gov/nasa/jpf/jvm/bytecode/GETFIELD.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.jvm.bytecode; import gov.nasa.jpf.vm.ElementInfo; import gov.nasa.jpf.vm.FieldInfo; import gov.nasa.jpf.vm.Instruction; import gov.nasa.jpf.vm.MJIEnv; import gov.nasa.jpf.vm.Scheduler; import gov.nasa.jpf.vm.StackFrame; import gov.nasa.jpf.vm.ThreadInfo; import gov.nasa.jpf.vm.bytecode.ReadInstruction; /** * Fetch field from object * ..., objectref => ..., value */ public class GETFIELD extends JVMInstanceFieldInstruction implements ReadInstruction { public GETFIELD (String fieldName, String classType, String fieldDescriptor){ super(fieldName, classType, fieldDescriptor); } @Override public int getObjectSlot (StackFrame frame){ return frame.getTopPos(); } @Override public Instruction execute (ThreadInfo ti) { StackFrame frame = ti.getModifiableTopFrame(); int objRef = frame.peek(); // don't pop yet, we might re-enter lastThis = objRef; //--- check for obvious exceptions if (objRef == MJIEnv.NULL) { return ti.createAndThrowException("java.lang.NullPointerException", "referencing field '" + fname + "' on null object"); } ElementInfo eiFieldOwner = ti.getElementInfo(objRef); FieldInfo fieldInfo = getFieldInfo(); if (fieldInfo == null) { return ti.createAndThrowException("java.lang.NoSuchFieldError", "referencing field '" + fname + "' in " + eiFieldOwner); } //--- check for potential transition breaks (be aware everything above gets re-executed) Scheduler scheduler = ti.getScheduler(); if (scheduler.canHaveSharedObjectCG( ti, this, eiFieldOwner, fieldInfo)){ eiFieldOwner = scheduler.updateObjectSharedness( ti, eiFieldOwner, fieldInfo); if (scheduler.setsSharedObjectCG( ti, this, eiFieldOwner, fieldInfo)){ return this; // re-execute } } frame.pop(); // Ok, now we can remove the object ref from the stack Object fieldAttr = eiFieldOwner.getFieldAttr(fieldInfo); // We could encapsulate the push in ElementInfo, but not the GET, so we keep it at the same level if (fieldInfo.getStorageSize() == 1) { // 1 slotter int ival = eiFieldOwner.get1SlotField(fieldInfo); lastValue = ival; if (fieldInfo.isReference()){ frame.pushRef(ival); } else { frame.push(ival); } if (fieldAttr != null) { frame.setOperandAttr(fieldAttr); } } else { // 2 slotter long lval = eiFieldOwner.get2SlotField(fieldInfo); lastValue = lval; frame.pushLong( lval); if (fieldAttr != null) { frame.setLongOperandAttr(fieldAttr); } } return getNext(ti); } @Override public ElementInfo peekElementInfo (ThreadInfo ti) { StackFrame frame = ti.getTopFrame(); int objRef = frame.peek(); ElementInfo ei = ti.getElementInfo(objRef); return ei; } @Override public boolean isMonitorEnterPrologue(){ return GetHelper.isMonitorEnterPrologue(mi, insnIndex); } @Override public int getLength() { return 3; // opcode, index1, index2 } @Override public int getByteCode () { return 0xB4; } @Override public boolean isRead() { return true; } @Override public void accept(JVMInstructionVisitor insVisitor) { insVisitor.visit(this); } }