Mercurial > hg > Members > kono > jpf-core

comparison src/main/gov/nasa/jpf/jvm/bytecode/AASTORE.java @ 0:61d41facf527

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initial v8 import (history reset)
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
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-1:000000000000 0:61d41facf527
1 /*
2 * Copyright (C) 2014, United States Government, as represented by the
3 * Administrator of the National Aeronautics and Space Administration.
4 * All rights reserved.
5 *
6 * The Java Pathfinder core (jpf-core) platform is licensed under the
7 * Apache License, Version 2.0 (the "License"); you may not use this file except
8 * in compliance with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0.
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package gov.nasa.jpf.jvm.bytecode;
19
20 import gov.nasa.jpf.util.InstructionState;
21 import gov.nasa.jpf.vm.ArrayIndexOutOfBoundsExecutiveException;
22 import gov.nasa.jpf.vm.ClassInfo;
23 import gov.nasa.jpf.vm.ElementInfo;
24 import gov.nasa.jpf.vm.Instruction;
25 import gov.nasa.jpf.vm.MJIEnv;
26 import gov.nasa.jpf.vm.Scheduler;
27 import gov.nasa.jpf.vm.StackFrame;
28 import gov.nasa.jpf.vm.ThreadInfo;
29
30
31 /**
32 * Store into reference array
33 * ..., arrayref, index, value => ...
34 */
35 public class AASTORE extends ArrayStoreInstruction {
36
37 int value;
38
39 @Override
40 public boolean isReferenceArray() {
41 return true;
42 }
43
44 @Override
45 protected void popValue(StackFrame frame){
46 value = frame.pop();
47 }
48
49 @Override
50 protected void setField (ElementInfo ei, int index) throws ArrayIndexOutOfBoundsExecutiveException {
51 ei.checkArrayBounds(index);
52 ei.setReferenceElement(index, value);
53 }
54
55 /**
56 * overridden because AASTORE can cause ArrayStoreExceptions and exposure CGs
57 */
58 @Override
59 public Instruction execute (ThreadInfo ti) {
60 StackFrame frame = ti.getModifiableTopFrame();
61 int refValue = frame.peek();
62 int idx = frame.peek(1);
63 int aref = frame.peek(2);
64
65 value = aref;
66 index = idx;
67
68 if (aref == MJIEnv.NULL) {
69 return ti.createAndThrowException("java.lang.NullPointerException");
70 }
71
72 ElementInfo eiArray = ti.getModifiableElementInfo(aref);
73
74 if (!ti.isFirstStepInsn()){ // we only need to check this once
75 Instruction xInsn = checkArrayStoreException(ti, frame, eiArray);
76 if (xInsn != null){
77 return xInsn;
78 }
79 }
80
81 boolean checkExposure = false;
82 Scheduler scheduler = ti.getScheduler();
83 if (scheduler.canHaveSharedArrayCG(ti, this, eiArray, idx)){
84 checkExposure = true;
85 eiArray = scheduler.updateArraySharedness(ti, eiArray, index);
86 if (scheduler.setsSharedArrayCG(ti, this, eiArray, idx)){
87 return this;
88 }
89 }
90
91 // check if this gets re-executed from an exposure CG
92 if (frame.getAndResetFrameAttr(InstructionState.class) == null){
93 try {
94 Object attr = frame.getOperandAttr();
95 eiArray.checkArrayBounds(idx);
96 eiArray.setReferenceElement(idx, refValue);
97 eiArray.setElementAttrNoClone(idx, attr);
98
99 } catch (ArrayIndexOutOfBoundsExecutiveException ex) { // at this point, the AIOBX is already processed
100 return ex.getInstruction();
101 }
102
103 if (checkExposure) {
104 if (refValue != MJIEnv.NULL) {
105 ElementInfo eiExposed = ti.getElementInfo(refValue);
106 if (scheduler.setsSharedObjectExposureCG(ti, this, eiArray, null, eiArray)) {
107 frame.addFrameAttr( InstructionState.processed);
108 return this;
109 }
110 }
111 }
112 }
113
114 frame.pop(3);
115
116 return getNext(ti);
117 }
118
119 protected Instruction checkArrayStoreException(ThreadInfo ti, StackFrame frame, ElementInfo ei){
120 ClassInfo c = ei.getClassInfo();
121 int refVal = frame.peek();
122
123 if (refVal != MJIEnv.NULL) { // no checks for storing 'null'
124 ClassInfo elementCi = ti.getClassInfo(refVal);
125 ClassInfo arrayElementCi = c.getComponentClassInfo();
126 if (!elementCi.isInstanceOf(arrayElementCi)) {
127 String exception = "java.lang.ArrayStoreException";
128 String exceptionDescription = elementCi.getName();
129 return ti.createAndThrowException(exception, exceptionDescription);
130 }
131 }
132
133 return null;
134 }
135
136
137 @Override
138 public int getByteCode () {
139 return 0x53;
140 }
141
142 @Override
143 public void accept(JVMInstructionVisitor insVisitor) {
144 insVisitor.visit(this);
145 }
146 }