Mercurial > hg > Members > kono > jpf-core

comparison src/main/gov/nasa/jpf/jvm/bytecode/GETFIELD.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 /*
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.vm.ElementInfo;
21 import gov.nasa.jpf.vm.FieldInfo;
22 import gov.nasa.jpf.vm.Instruction;
23 import gov.nasa.jpf.vm.MJIEnv;
24 import gov.nasa.jpf.vm.Scheduler;
25 import gov.nasa.jpf.vm.StackFrame;
26 import gov.nasa.jpf.vm.ThreadInfo;
27 import gov.nasa.jpf.vm.bytecode.ReadInstruction;
28
29
30 /**
31 * Fetch field from object
32 * ..., objectref => ..., value
33 */
34 public class GETFIELD extends JVMInstanceFieldInstruction implements ReadInstruction {
35
36 public GETFIELD (String fieldName, String classType, String fieldDescriptor){
37 super(fieldName, classType, fieldDescriptor);
38 }
39
40
41 @Override
42 public int getObjectSlot (StackFrame frame){
43 return frame.getTopPos();
44 }
45
46 @Override
47 public Instruction execute (ThreadInfo ti) {
48 StackFrame frame = ti.getModifiableTopFrame();
49 int objRef = frame.peek(); // don't pop yet, we might re-enter
50 lastThis = objRef;
51
52 //--- check for obvious exceptions
53 if (objRef == MJIEnv.NULL) {
54 return ti.createAndThrowException("java.lang.NullPointerException",
55 "referencing field '" + fname + "' on null object");
56 }
57
58 ElementInfo eiFieldOwner = ti.getElementInfo(objRef);
59 FieldInfo fieldInfo = getFieldInfo();
60 if (fieldInfo == null) {
61 return ti.createAndThrowException("java.lang.NoSuchFieldError",
62 "referencing field '" + fname + "' in " + eiFieldOwner);
63 }
64
65 //--- check for potential transition breaks (be aware everything above gets re-executed)
66 Scheduler scheduler = ti.getScheduler();
67 if (scheduler.canHaveSharedObjectCG( ti, this, eiFieldOwner, fieldInfo)){
68 eiFieldOwner = scheduler.updateObjectSharedness( ti, eiFieldOwner, fieldInfo);
69 if (scheduler.setsSharedObjectCG( ti, this, eiFieldOwner, fieldInfo)){
70 return this; // re-execute
71 }
72 }
73
74 frame.pop(); // Ok, now we can remove the object ref from the stack
75 Object fieldAttr = eiFieldOwner.getFieldAttr(fieldInfo);
76
77 // We could encapsulate the push in ElementInfo, but not the GET, so we keep it at the same level
78 if (fieldInfo.getStorageSize() == 1) { // 1 slotter
79 int ival = eiFieldOwner.get1SlotField(fieldInfo);
80 lastValue = ival;
81
82 if (fieldInfo.isReference()){
83 frame.pushRef(ival);
84
85 } else {
86 frame.push(ival);
87 }
88
89 if (fieldAttr != null) {
90 frame.setOperandAttr(fieldAttr);
91 }
92
93 } else { // 2 slotter
94 long lval = eiFieldOwner.get2SlotField(fieldInfo);
95 lastValue = lval;
96
97 frame.pushLong( lval);
98 if (fieldAttr != null) {
99 frame.setLongOperandAttr(fieldAttr);
100 }
101 }
102
103 return getNext(ti);
104 }
105
106 @Override
107 public ElementInfo peekElementInfo (ThreadInfo ti) {
108 StackFrame frame = ti.getTopFrame();
109 int objRef = frame.peek();
110 ElementInfo ei = ti.getElementInfo(objRef);
111 return ei;
112 }
113
114 @Override
115 public boolean isMonitorEnterPrologue(){
116 return GetHelper.isMonitorEnterPrologue(mi, insnIndex);
117 }
118
119 @Override
120 public int getLength() {
121 return 3; // opcode, index1, index2
122 }
123
124 @Override
125 public int getByteCode () {
126 return 0xB4;
127 }
128
129 @Override
130 public boolean isRead() {
131 return true;
132 }
133
134 @Override
135 public void accept(JVMInstructionVisitor insVisitor) {
136 insVisitor.visit(this);
137 }
138 }