Mercurial > hg > Members > kono > jpf-core
diff src/main/gov/nasa/jpf/jvm/bytecode/GETSTATIC.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 |
parents | |
children | db918c531e6d |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/main/gov/nasa/jpf/jvm/bytecode/GETSTATIC.java Fri Jan 23 10:14:01 2015 -0800 @@ -0,0 +1,129 @@ +/* + * 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.ClassInfo; +import gov.nasa.jpf.vm.ElementInfo; +import gov.nasa.jpf.vm.FieldInfo; +import gov.nasa.jpf.vm.Instruction; +import gov.nasa.jpf.vm.LoadOnJPFRequired; +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; + + +/** + * Get static fieldInfo from class + * ..., => ..., value + */ +public class GETSTATIC extends JVMStaticFieldInstruction implements ReadInstruction { + + public GETSTATIC(String fieldName, String clsDescriptor, String fieldDescriptor){ + super(fieldName, clsDescriptor, fieldDescriptor); + } + + @Override + public Instruction execute (ThreadInfo ti) { + FieldInfo fieldInfo; + + //--- check if this causes a class load by a user defined classloader + try { + fieldInfo = getFieldInfo(); + } catch (LoadOnJPFRequired lre) { + return ti.getPC(); + } + + if (fieldInfo == null) { + return ti.createAndThrowException("java.lang.NoSuchFieldError", + (className + '.' + fname)); + } + + //--- check if this has to trigger class initialization + ClassInfo ciField = fieldInfo.getClassInfo(); + if (!mi.isClinit(ciField) && ciField.pushRequiredClinits(ti)) { + // note - this returns the next insn in the topmost clinit that just got pushed + return ti.getPC(); + } + ElementInfo eiFieldOwner = ciField.getStaticElementInfo(); + + //--- check if this breaks the transition + Scheduler scheduler = ti.getScheduler(); + if (scheduler.canHaveSharedClassCG( ti, this, eiFieldOwner, fieldInfo)){ + eiFieldOwner = scheduler.updateClassSharedness(ti, eiFieldOwner, fieldInfo); + if (scheduler.setsSharedClassCG( ti, this, eiFieldOwner, fieldInfo)){ + return this; // re-execute + } + } + + Object fieldAttr = eiFieldOwner.getFieldAttr(fieldInfo); + StackFrame frame = ti.getModifiableTopFrame(); + + if (size == 1) { + int ival = eiFieldOwner.get1SlotField(fieldInfo); + lastValue = ival; + + if (fieldInfo.isReference()) { + frame.pushRef(ival); + } else { + frame.push(ival); + } + + if (fieldAttr != null) { + frame.setOperandAttr(fieldAttr); + } + + } else { + long lval = eiFieldOwner.get2SlotField(fieldInfo); + lastValue = lval; + + frame.pushLong(lval); + + if (fieldAttr != null) { + frame.setLongOperandAttr(fieldAttr); + } + } + + return getNext(ti); + } + + @Override + public boolean isMonitorEnterPrologue(){ + return GetHelper.isMonitorEnterPrologue(mi, insnIndex); + } + + @Override + public int getLength() { + return 3; // opcode, index1, index2 + } + + @Override + public int getByteCode () { + return 0xB2; + } + + @Override + public boolean isRead() { + return true; + } + + @Override + public void accept(JVMInstructionVisitor insVisitor) { + insVisitor.visit(this); + } +}