Mercurial > hg > Members > kono > jpf-core
view src/main/gov/nasa/jpf/jvm/bytecode/PUTFIELD.java @ 23:db918c531e6d
streamlined class init, which was a mixed case of registerClass()/initializeClass() and pushRequiredClinits(). Now it is a single initializeClass(ti) method which combines the previous initializeClass(), pushRequiredClinits() and pushClinit() methods. The reason for combining these is the forthcoming replacement of separately locked clinits from different DirectCallStackFrames with a single synthetic frame that calls clinits from nested synchronized blocks. This is required to model hotspot, which does cause deadlocks with concurrent init of classes that cause subclass init during their clinit executions.
author | Peter Mehlitz <Peter.C.Mehlitz@nasa.gov> |
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date | Wed, 15 Apr 2015 22:40:21 -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.jvm.bytecode; import gov.nasa.jpf.util.InstructionState; 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.WriteInstruction; /** * Set field in object * ..., objectref, value => ... */ public class PUTFIELD extends JVMInstanceFieldInstruction implements WriteInstruction { public PUTFIELD(String fieldName, String clsDescriptor, String fieldDescriptor){ super(fieldName, clsDescriptor, fieldDescriptor); } @Override public int getObjectSlot (StackFrame frame){ return frame.getTopPos() - size; } /** * where do we get the value from? * NOTE: only makes sense in a executeInstruction() context */ @Override public int getValueSlot (StackFrame frame){ return frame.getTopPos(); } /** * where do we write to? * NOTE: this should only be used from a executeInstruction()/instructionExecuted() context */ @Override public ElementInfo getElementInfo(ThreadInfo ti){ if (isCompleted(ti)){ return ti.getElementInfo(lastThis); } else { return peekElementInfo(ti); // get it from the stack } } @Override public Instruction execute (ThreadInfo ti) { StackFrame frame = ti.getModifiableTopFrame(); int objRef = frame.peek( size); lastThis = objRef; if (objRef == MJIEnv.NULL) { return ti.createAndThrowException("java.lang.NullPointerException", "referencing field '" + fname + "' on null object"); } ElementInfo eiFieldOwner = ti.getModifiableElementInfo(objRef); FieldInfo fieldInfo = getFieldInfo(); if (fieldInfo == null) { return ti.createAndThrowException("java.lang.NoSuchFieldError", "no field " + fname + " in " + eiFieldOwner); } //--- check scheduling point due to shared object access Scheduler scheduler = ti.getScheduler(); if (scheduler.canHaveSharedObjectCG(ti,this,eiFieldOwner,fieldInfo)){ eiFieldOwner = scheduler.updateObjectSharedness( ti, eiFieldOwner, fi); if (scheduler.setsSharedObjectCG( ti, this, eiFieldOwner, fieldInfo)){ return this; // re-execute } } // this might be re-executed if (frame.getAndResetFrameAttr(InstructionState.class) == null){ lastValue = PutHelper.setField(ti, frame, eiFieldOwner, fieldInfo); } //--- check scheduling point due to exposure through shared object if (isReferenceField()){ int refValue = frame.peek(); if (refValue != MJIEnv.NULL){ ElementInfo eiExposed = ti.getElementInfo(refValue); if (scheduler.setsSharedObjectExposureCG(ti, this, eiFieldOwner, fi, eiExposed)){ frame.addFrameAttr( InstructionState.processed); return this; // re-execute AFTER assignment } } } popOperands(frame); return getNext(); } protected void popOperands (StackFrame frame){ if (size == 1){ frame.pop(2); // .. objref, val => .. } else { frame.pop(3); // .. objref, highVal,lowVal => .. } } @Override public ElementInfo peekElementInfo (ThreadInfo ti) { FieldInfo fi = getFieldInfo(); int storageSize = fi.getStorageSize(); int objRef = ti.getTopFrame().peek( (storageSize == 1) ? 1 : 2); ElementInfo ei = ti.getElementInfo( objRef); return ei; } @Override public int getLength() { return 3; // opcode, index1, index2 } @Override public int getByteCode () { return 0xB5; } @Override public boolean isRead() { return false; } @Override public void accept(JVMInstructionVisitor insVisitor) { insVisitor.visit(this); } }