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
|
/*
* Copyright 2006 The Closure Compiler Authors.
*
* 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 com.google.javascript.jscomp;
/**
* Unit tests for {@link ExploitAssigns}
*
* @author nicksantos@google.com (Nick Santos)
* @author acleung@google.com (Alan Leung)
*/
public class ExploitAssignsTest extends CompilerTestCase {
public void testExprExploitationTypes() {
test("a = true; b = true",
"b = a = true");
test("a = !0; b = !0",
"b = a = !0");
test("a = !1; b = !1",
"b = a = !1");
test("a = void 0; b = void 0",
"b = a = void 0");
test("a = -Infinity; b = -Infinity",
"b = a = -Infinity");
}
public void testExprExploitationTypes2() {
test("a = !0; b = !0",
"b = a = !0");
}
public void testExprExploitation() {
test("a = null; b = null; var c = b",
"var c = b = a = null");
test("a = null; b = null",
"b = a = null");
test("a = undefined; b = undefined",
"b = a = undefined");
test("a = 0; b = 0", "b=a=0");
test("a = 'foo'; b = 'foo'",
"b = a = \"foo\"");
test("a = c; b = c", "b=a=c");
testSame("a = 0; b = 1");
testSame("a = \"foo\"; b = \"foox\"");
test("a = null; a && b;", "(a = null)&&b");
test("a = null; a || b;", "(a = null)||b");
test("a = null; a ? b : c;", "(a = null) ? b : c");
test("a = null; this.foo = null;",
"this.foo = a = null");
test("function f(){ a = null; return null; }",
"function f(){return a = null}");
test("a = true; if (a) { foo(); }",
"if (a = true) { foo() }");
test("a = true; if (a && a) { foo(); }",
"if ((a = true) && a) { foo() }");
test("a = false; if (a) { foo(); }",
"if (a = false) { foo() }");
test("a = !0; if (a) { foo(); }",
"if (a = !0) { foo() }");
test("a = !0; if (a && a) { foo(); }",
"if ((a = !0) && a) { foo() }");
test("a = !1; if (a) { foo(); }",
"if (a = !1) { foo() }");
testSame("a = this.foo; a();");
test("a = b; b = a;",
"b = a = b");
testSame("a = b; a.c = a");
test("this.foo = null; this.bar = null;",
"this.bar = this.foo = null");
test("this.foo = null; this.bar = null; this.baz = this.bar",
"this.baz = this.bar = this.foo = null");
test("this.foo = null; a = null;",
"a = this.foo = null");
test("this.foo = null; a = this.foo;",
"a = this.foo = null");
test("a.b.c=null; a=null;",
"a = a.b.c = null");
testSame("a = null; a.b.c = null");
test("(a=b).c = null; this.b = null;",
"this.b = (a=b).c = null");
testSame("if(x) a = null; else b = a");
}
public void testNestedExprExploitation() {
test("this.foo = null; this.bar = null; this.baz = null;",
"this.baz = this.bar = this.foo = null");
test("a = 3; this.foo = a; this.bar = a; this.baz = 3;",
"this.baz = this.bar = this.foo = a = 3");
test("a = 3; this.foo = a; this.bar = this.foo; this.baz = a;",
"this.baz = this.bar = this.foo = a = 3");
test("a = 3; this.foo = a; this.bar = 3; this.baz = this.foo;",
"this.baz = this.bar = this.foo = a = 3");
test("a = 3; this.foo = a; a = 3; this.bar = 3; " +
"a = 3; this.baz = this.foo;",
"this.baz = a = this.bar = a = this.foo = a = 3");
test("a = 4; this.foo = a; a = 3; this.bar = 3; " +
"a = 3; this.baz = this.foo;",
"this.foo = a = 4; a = this.bar = a = 3; this.baz = this.foo");
test("a = 3; this.foo = a; a = 4; this.bar = 3; " +
"a = 3; this.baz = this.foo;",
"this.foo = a = 3; a = 4; a = this.bar = 3; this.baz = this.foo");
test("a = 3; this.foo = a; a = 3; this.bar = 3; " +
"a = 4; this.baz = this.foo;",
"this.bar = a = this.foo = a = 3; a = 4; this.baz = this.foo");
}
public void testBug1840071() {
// Some external properties are implemented as setters. Let's
// make sure that we don't collapse them inappropriately.
test("a.b = a.x; if (a.x) {}", "if (a.b = a.x) {}");
testSame("a.b = a.x; if (a.b) {}");
test("a.b = a.c = a.x; if (a.x) {}", "if (a.b = a.c = a.x) {}");
testSame("a.b = a.c = a.x; if (a.c) {}");
testSame("a.b = a.c = a.x; if (a.b) {}");
}
public void testBug2072343() {
testSame("a = a.x;a = a.x");
testSame("a = a.x;b = a.x");
test("b = a.x;a = a.x", "a = b = a.x");
testSame("a.x = a;a = a.x");
testSame("a.b = a.b.x;a.b = a.b.x");
testSame("a.y = a.y.x;b = a.y;c = a.y.x");
test("a = a.x;b = a;c = a.x", "b = a = a.x;c = a.x");
test("b = a.x;a = b;c = a.x", "a = b = a.x;c = a.x");
}
public void testBadCollapseIntoCall() {
// Can't collapse this, because if we did, 'foo' would be called
// in the wrong 'this' context.
testSame("this.foo = function() {}; this.foo();");
}
public void testBadCollapse() {
testSame("this.$e$ = []; this.$b$ = null;");
}
@Override
protected CompilerPass getProcessor(Compiler compiler) {
return new PeepholeOptimizationsPass(compiler,new ExploitAssigns());
}
}
|
