Mercurial > hg > Members > kono > jpf-core

comparison src/main/gov/nasa/jpf/vm/Step.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.vm;
19
20 import gov.nasa.jpf.util.Source;
21
22 import java.util.WeakHashMap;
23
24 /**
25 * this corresponds to an executed instruction. Note that we can have a
26 * potentially huge number of Steps, hence we want to save objects here
27 * (e.g. Collection overhead)
28 */
29 public class Step {
30
31 private static WeakHashMap<Step, String> s_comments = new WeakHashMap<Step, String>(); // Not every Step gets a comment. So save memory and put comments in a global comment HashMap. Make this a WeakHashMap so that old Step objects can be GCed.
32
33 private final Instruction insn;
34 Step next;
35
36 public Step (Instruction insn) {
37 if (insn == null)
38 throw new IllegalArgumentException("insn == null");
39
40 this.insn = insn;
41 }
42
43 public Step getNext() {
44 return next;
45 }
46
47 public Instruction getInstruction() {
48 return insn;
49 }
50
51 public void setComment (String s) {
52 s_comments.put(this, s);
53 }
54
55 public String getComment () {
56 return s_comments.get(this);
57 }
58
59 public String getLineString () {
60 MethodInfo mi = insn.getMethodInfo();
61 if (mi != null) {
62 Source source = Source.getSource(mi.getSourceFileName());
63 if (source != null) {
64 int line = mi.getLineNumber(insn);
65 if (line > 0) {
66 return source.getLine(line);
67 }
68 }
69 }
70
71 return null;
72 }
73
74 public boolean sameSourceLocation (Step other){
75
76 if (other != null){
77 MethodInfo mi = insn.getMethodInfo();
78 MethodInfo miOther = other.insn.getMethodInfo();
79 if (mi == miOther){
80 return (mi.getLineNumber(insn) == miOther.getLineNumber(other.insn));
81 }
82 }
83
84 return false;
85 }
86
87 public String getLocationString() {
88 MethodInfo mi = insn.getMethodInfo();
89 if (mi != null) {
90 return mi.getSourceFileName() + ':' + mi.getLineNumber(insn);
91 }
92
93 return "?:?";
94 }
95
96 @Override
97 public String toString() {
98 return getLocationString();
99 }
100 }