Mercurial > hg > Members > kono > jpf-core

comparison src/main/gov/nasa/jpf/vm/bytecode/InstanceFieldInstruction.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
19 package gov.nasa.jpf.vm.bytecode;
20
21 import gov.nasa.jpf.vm.ClassInfo;
22 import gov.nasa.jpf.vm.ClassLoaderInfo;
23 import gov.nasa.jpf.vm.ElementInfo;
24 import gov.nasa.jpf.vm.FieldInfo;
25 import gov.nasa.jpf.vm.MJIEnv;
26 import gov.nasa.jpf.vm.StackFrame;
27 import gov.nasa.jpf.vm.ThreadInfo;
28 import gov.nasa.jpf.vm.VM;
29
30 /**
31 * common machine independent type for all instance field access instructions
32 */
33 public abstract class InstanceFieldInstruction extends FieldInstruction {
34
35 protected int lastThis = MJIEnv.NULL;
36
37 protected InstanceFieldInstruction (String fieldName, String classType, String fieldDescriptor){
38 super(fieldName, classType, fieldDescriptor);
39 }
40
41 public abstract int getObjectSlot (StackFrame frame);
42
43 @Override
44 public ElementInfo getElementInfo (ThreadInfo ti){
45 if (isCompleted(ti)){
46 return ti.getElementInfo(lastThis);
47 } else {
48 return peekElementInfo(ti);
49 }
50 }
51
52 @Override
53 public String toPostExecString(){
54 StringBuilder sb = new StringBuilder();
55 sb.append(getMnemonic());
56 sb.append(' ');
57 sb.append( getLastElementInfo());
58 sb.append('.');
59 sb.append(fname);
60
61 return sb.toString();
62 }
63
64 @Override
65 public FieldInfo getFieldInfo () {
66 if (fi == null) {
67 ClassInfo ci = ClassLoaderInfo.getCurrentResolvedClassInfo(className);
68 if (ci != null) {
69 fi = ci.getInstanceField(fname);
70 }
71 }
72 return fi;
73 }
74
75 /**
76 * NOTE - the return value is *only* valid in a instructionExecuted() context, since
77 * the same instruction can be executed from different threads
78 */
79 public int getLastThis() {
80 return lastThis;
81 }
82
83 /**
84 * since this is based on getLastThis(), the same context restrictions apply
85 */
86 @Override
87 public ElementInfo getLastElementInfo () {
88 if (lastThis != MJIEnv.NULL) {
89 return VM.getVM().getHeap().get(lastThis); // <2do> remove - should be in clients
90 }
91
92 return null;
93 }
94
95 public String getFieldDescriptor () {
96 ElementInfo ei = getLastElementInfo();
97 FieldInfo fi = getFieldInfo();
98
99 return ei.toString() + '.' + fi.getName();
100 }
101
102 }