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annotate src/main/gov/nasa/jpf/jvm/bytecode/GETSTATIC.java @ 23:db918c531e6d

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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>
date Wed, 15 Apr 2015 22:40:21 -0700
parents 61d41facf527
children
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1 /*
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2 * Copyright (C) 2014, United States Government, as represented by the
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3 * Administrator of the National Aeronautics and Space Administration.
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4 * All rights reserved.
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5 *
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6 * The Java Pathfinder core (jpf-core) platform is licensed under the
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7 * Apache License, Version 2.0 (the "License"); you may not use this file except
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8 * in compliance with the License. You may obtain a copy of the License at
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9 *
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10 * http://www.apache.org/licenses/LICENSE-2.0.
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11 *
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12 * Unless required by applicable law or agreed to in writing, software
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13 * distributed under the License is distributed on an "AS IS" BASIS,
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14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 * See the License for the specific language governing permissions and
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16 * limitations under the License.
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17 */
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18 package gov.nasa.jpf.jvm.bytecode;
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19
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20 import gov.nasa.jpf.vm.ClassInfo;
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21 import gov.nasa.jpf.vm.ElementInfo;
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22 import gov.nasa.jpf.vm.FieldInfo;
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23 import gov.nasa.jpf.vm.Instruction;
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24 import gov.nasa.jpf.vm.LoadOnJPFRequired;
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25 import gov.nasa.jpf.vm.Scheduler;
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26 import gov.nasa.jpf.vm.StackFrame;
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27 import gov.nasa.jpf.vm.ThreadInfo;
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28 import gov.nasa.jpf.vm.bytecode.ReadInstruction;
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29
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30
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31 /**
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32 * Get static fieldInfo from class
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33 * ..., => ..., value
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34 */
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35 public class GETSTATIC extends JVMStaticFieldInstruction implements ReadInstruction {
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36
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37 public GETSTATIC(String fieldName, String clsDescriptor, String fieldDescriptor){
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38 super(fieldName, clsDescriptor, fieldDescriptor);
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39 }
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40
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41 @Override
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42 public Instruction execute (ThreadInfo ti) {
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43 FieldInfo fieldInfo;
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44
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45 //--- check if this causes a class load by a user defined classloader
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46 try {
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47 fieldInfo = getFieldInfo();
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48 } catch (LoadOnJPFRequired lre) {
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49 return ti.getPC();
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50 }
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51
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52 if (fieldInfo == null) {
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53 return ti.createAndThrowException("java.lang.NoSuchFieldError",
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54 (className + '.' + fname));
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55 }
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56
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57 //--- check if this has to trigger class initialization
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58 ClassInfo ciField = fieldInfo.getClassInfo();
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.
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59 if (!mi.isClinit(ciField) && ciField.initializeClass(ti)) {
0
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60 // note - this returns the next insn in the topmost clinit that just got pushed
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61 return ti.getPC();
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62 }
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63 ElementInfo eiFieldOwner = ciField.getStaticElementInfo();
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64
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65 //--- check if this breaks the transition
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66 Scheduler scheduler = ti.getScheduler();
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67 if (scheduler.canHaveSharedClassCG( ti, this, eiFieldOwner, fieldInfo)){
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68 eiFieldOwner = scheduler.updateClassSharedness(ti, eiFieldOwner, fieldInfo);
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69 if (scheduler.setsSharedClassCG( ti, this, eiFieldOwner, fieldInfo)){
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70 return this; // re-execute
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71 }
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72 }
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73
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74 Object fieldAttr = eiFieldOwner.getFieldAttr(fieldInfo);
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75 StackFrame frame = ti.getModifiableTopFrame();
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76
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77 if (size == 1) {
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78 int ival = eiFieldOwner.get1SlotField(fieldInfo);
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79 lastValue = ival;
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80
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81 if (fieldInfo.isReference()) {
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82 frame.pushRef(ival);
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83 } else {
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84 frame.push(ival);
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85 }
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86
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87 if (fieldAttr != null) {
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88 frame.setOperandAttr(fieldAttr);
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89 }
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90
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91 } else {
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92 long lval = eiFieldOwner.get2SlotField(fieldInfo);
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93 lastValue = lval;
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94
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95 frame.pushLong(lval);
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96
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97 if (fieldAttr != null) {
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98 frame.setLongOperandAttr(fieldAttr);
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99 }
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100 }
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101
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102 return getNext(ti);
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103 }
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104
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105 @Override
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106 public boolean isMonitorEnterPrologue(){
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107 return GetHelper.isMonitorEnterPrologue(mi, insnIndex);
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108 }
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109
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110 @Override
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111 public int getLength() {
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112 return 3; // opcode, index1, index2
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113 }
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114
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115 @Override
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116 public int getByteCode () {
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117 return 0xB2;
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118 }
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119
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120 @Override
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121 public boolean isRead() {
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122 return true;
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123 }
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124
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125 @Override
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126 public void accept(JVMInstructionVisitor insVisitor) {
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127 insVisitor.visit(this);
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128 }
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129 }