1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.java.decompiler.modules.decompiler.vars;
import org.jetbrains.java.decompiler.modules.decompiler.decompose.GenericDominatorEngine;
import org.jetbrains.java.decompiler.modules.decompiler.decompose.IGraph;
import org.jetbrains.java.decompiler.modules.decompiler.decompose.IGraphNode;
import org.jetbrains.java.decompiler.util.VBStyleCollection;
import java.util.*;
public class VarVersionsGraph {
public int counter = 0;
public VBStyleCollection<VarVersionNode, VarVersionPaar> nodes = new VBStyleCollection<VarVersionNode, VarVersionPaar>();
private GenericDominatorEngine engine;
public VarVersionNode createNode(VarVersionPaar ver) {
VarVersionNode node;
nodes.addWithKey(node = new VarVersionNode(ver.var, ver.version), ver);
return node;
}
public void addNodes(Collection<VarVersionNode> colnodes, Collection<VarVersionPaar> colpaars) {
nodes.addAllWithKey(colnodes, colpaars);
}
public boolean isDominatorSet(VarVersionNode node, HashSet<VarVersionNode> domnodes) {
if (domnodes.size() == 1) {
return engine.isDominator(node, domnodes.iterator().next());
}
else {
HashSet<VarVersionNode> marked = new HashSet<VarVersionNode>();
if (domnodes.contains(node)) {
return true;
}
LinkedList<VarVersionNode> lstNodes = new LinkedList<VarVersionNode>();
lstNodes.add(node);
while (!lstNodes.isEmpty()) {
VarVersionNode nd = lstNodes.remove(0);
if (marked.contains(nd)) {
continue;
}
else {
marked.add(nd);
}
if (nd.preds.isEmpty()) {
return false;
}
for (VarVersionEdge edge : nd.preds) {
VarVersionNode pred = edge.source;
if (!marked.contains(pred) && !domnodes.contains(pred)) {
lstNodes.add(pred);
}
}
}
}
return true;
}
public void initDominators() {
final HashSet<VarVersionNode> roots = new HashSet<VarVersionNode>();
for (VarVersionNode node : nodes) {
if (node.preds.isEmpty()) {
roots.add(node);
}
}
engine = new GenericDominatorEngine(new IGraph() {
public List<? extends IGraphNode> getReversePostOrderList() {
return getReversedPostOrder(roots);
}
public Set<? extends IGraphNode> getRoots() {
return new HashSet<IGraphNode>(roots);
}
});
engine.initialize();
}
private static LinkedList<VarVersionNode> getReversedPostOrder(Collection<VarVersionNode> roots) {
LinkedList<VarVersionNode> lst = new LinkedList<VarVersionNode>();
HashSet<VarVersionNode> setVisited = new HashSet<VarVersionNode>();
for (VarVersionNode root : roots) {
LinkedList<VarVersionNode> lstTemp = new LinkedList<VarVersionNode>();
addToReversePostOrderListIterative(root, lstTemp, setVisited);
lst.addAll(lstTemp);
}
return lst;
}
private static void addToReversePostOrderListIterative(VarVersionNode root, List<VarVersionNode> lst, HashSet<VarVersionNode> setVisited) {
HashMap<VarVersionNode, List<VarVersionEdge>> mapNodeSuccs = new HashMap<VarVersionNode, List<VarVersionEdge>>();
LinkedList<VarVersionNode> stackNode = new LinkedList<VarVersionNode>();
LinkedList<Integer> stackIndex = new LinkedList<Integer>();
stackNode.add(root);
stackIndex.add(0);
while (!stackNode.isEmpty()) {
VarVersionNode node = stackNode.getLast();
int index = stackIndex.removeLast();
setVisited.add(node);
List<VarVersionEdge> lstSuccs = mapNodeSuccs.get(node);
if (lstSuccs == null) {
mapNodeSuccs.put(node, lstSuccs = new ArrayList<VarVersionEdge>(node.succs));
}
for (; index < lstSuccs.size(); index++) {
VarVersionNode succ = lstSuccs.get(index).dest;
if (!setVisited.contains(succ)) {
stackIndex.add(index + 1);
stackNode.add(succ);
stackIndex.add(0);
break;
}
}
if (index == lstSuccs.size()) {
lst.add(0, node);
stackNode.removeLast();
}
}
}
}
|
