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
168
169
170
171
172
173
174
175
176
|
/*
* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.nashorn.internal.ir;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import jdk.nashorn.internal.codegen.Label;
import jdk.nashorn.internal.ir.annotations.Ignore;
import jdk.nashorn.internal.ir.visitor.NodeVisitor;
import jdk.nashorn.internal.runtime.Source;
/**
* IR representation of a SWITCH statement.
*/
public class SwitchNode extends BreakableNode {
/** Switch expression. */
private Node expression;
/** Tag symbol. */
private Symbol tag;
/** Switch cases. */
private List<CaseNode> cases;
/** Switch default. */
@Ignore //points to one of the members in the list above, don't traverse twice
private CaseNode defaultCase;
/**
* Constructor
*
* @param source the source
* @param token token
* @param finish finish
*/
public SwitchNode(final Source source, final long token, final int finish) {
super(source, token, finish);
this.breakLabel = new Label("switch_break");
}
private SwitchNode(final SwitchNode switchNode, final CopyState cs) {
super(switchNode);
final List<CaseNode> newCases = new ArrayList<>();
for (final CaseNode caseNode : switchNode.getCases()) {
newCases.add((CaseNode)cs.existingOrCopy(caseNode));
}
this.expression = cs.existingOrCopy(switchNode.getExpression());
this.tag = switchNode.getTag();
this.cases = newCases;
this.defaultCase = (CaseNode)cs.existingOrCopy(switchNode.getDefaultCase());
this.breakLabel = new Label(switchNode.getBreakLabel());
}
@Override
protected Node copy(final CopyState cs) {
return new SwitchNode(this, cs);
}
@Override
public Node accept(final NodeVisitor visitor) {
if (visitor.enterSwitchNode(this) != null) {
expression = expression.accept(visitor);
for (int i = 0, count = cases.size(); i < count; i++) {
cases.set(i, (CaseNode)cases.get(i).accept(visitor));
}
//the default case is in the cases list and should not be explicitly traversed!
return visitor.leaveSwitchNode(this);
}
return this;
}
@Override
public void toString(final StringBuilder sb) {
sb.append("switch (");
expression.toString(sb);
sb.append(')');
}
/**
* Get the cases in this switch
* @return a list of case nodes
*/
public List<CaseNode> getCases() {
return Collections.unmodifiableList(cases);
}
/**
* Set or reset the list of cases in this switch
* @param cases a list of cases, case nodes
*/
public void setCases(final List<CaseNode> cases) {
this.cases = cases;
}
/**
* Get the default case for this switch
* @return default case node
*/
public CaseNode getDefaultCase() {
return defaultCase;
}
/**
* Set the default case for this switch
* @param defaultCase default case node
*/
public void setDefaultCase(final CaseNode defaultCase) {
this.defaultCase = defaultCase;
}
/**
* Return the expression to switch on
* @return switch expression
*/
public Node getExpression() {
return expression;
}
/**
* Set or reset the expression to switch on
* @param expression switch expression
*/
public void setExpression(final Node expression) {
this.expression = expression;
}
/**
* Get the tag symbol for this switch. The tag symbol is where
* the switch expression result is stored
* @return tag symbol
*/
public Symbol getTag() {
return tag;
}
/**
* Set the tag symbol for this switch. The tag symbol is where
* the switch expression result is stored
* @param tag a symbol
*/
public void setTag(final Symbol tag) {
this.tag = tag;
}
}
|
