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1 // Copyright 2011 the V8 project authors. All rights reserved. | |
2 // Redistribution and use in source and binary forms, with or without | |
3 // modification, are permitted provided that the following conditions are | |
4 // met: | |
5 // | |
6 // * Redistributions of source code must retain the above copyright | |
7 // notice, this list of conditions and the following disclaimer. | |
8 // * Redistributions in binary form must reproduce the above | |
9 // copyright notice, this list of conditions and the following | |
10 // disclaimer in the documentation and/or other materials provided | |
11 // with the distribution. | |
12 // * Neither the name of Google Inc. nor the names of its | |
13 // contributors may be used to endorse or promote products derived | |
14 // from this software without specific prior written permission. | |
15 // | |
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 | |
28 // Flags: --harmony-scoping | |
29 | |
30 "use strict"; | |
31 | |
32 // Test temporal dead zone semantics of let bound variables in | |
33 // function and block scopes. | |
34 | |
35 function TestFunctionLocal(s) { | |
36 try { | |
37 eval("(function(){" + s + "; })")(); | |
38 } catch (e) { | |
39 assertInstanceof(e, ReferenceError); | |
40 return; | |
41 } | |
42 assertUnreachable(); | |
43 } | |
44 | |
45 function TestBlockLocal(s,e) { | |
46 try { | |
47 eval("(function(){ {" + s + ";} })")(); | |
48 } catch (e) { | |
49 assertInstanceof(e, ReferenceError); | |
50 return; | |
51 } | |
52 assertUnreachable(); | |
53 } | |
54 | |
55 | |
56 function TestAll(s) { | |
57 TestBlockLocal(s); | |
58 TestFunctionLocal(s); | |
59 } | |
60 | |
61 // Use before initialization in declaration statement. | |
62 TestAll('let x = x + 1'); | |
63 TestAll('let x = x += 1'); | |
64 TestAll('let x = x++'); | |
65 TestAll('let x = ++x'); | |
66 TestAll('const x = x + 1'); | |
67 | |
68 // Use before initialization in prior statement. | |
69 TestAll('x + 1; let x;'); | |
70 TestAll('x = 1; let x;'); | |
71 TestAll('x += 1; let x;'); | |
72 TestAll('++x; let x;'); | |
73 TestAll('x++; let x;'); | |
74 TestAll('let y = x; const x = 1;'); | |
75 | |
76 TestAll('f(); let x; function f() { return x + 1; }'); | |
77 TestAll('f(); let x; function f() { x = 1; }'); | |
78 TestAll('f(); let x; function f() { x += 1; }'); | |
79 TestAll('f(); let x; function f() { ++x; }'); | |
80 TestAll('f(); let x; function f() { x++; }'); | |
81 TestAll('f(); const x = 1; function f() { return x; }'); | |
82 | |
83 TestAll('f()(); let x; function f() { return function() { return x + 1; } }'); | |
84 TestAll('f()(); let x; function f() { return function() { x = 1; } }'); | |
85 TestAll('f()(); let x; function f() { return function() { x += 1; } }'); | |
86 TestAll('f()(); let x; function f() { return function() { ++x; } }'); | |
87 TestAll('f()(); let x; function f() { return function() { x++; } }'); | |
88 TestAll('f()(); const x = 1; function f() { return function() { return x; } }'); | |
89 | |
90 // Use before initialization with a dynamic lookup. | |
91 TestAll('eval("x + 1;"); let x;'); | |
92 TestAll('eval("x = 1;"); let x;'); | |
93 TestAll('eval("x += 1;"); let x;'); | |
94 TestAll('eval("++x;"); let x;'); | |
95 TestAll('eval("x++;"); let x;'); | |
96 TestAll('eval("x"); const x = 1;'); | |
97 | |
98 // Use before initialization with check for eval-shadowed bindings. | |
99 TestAll('function f() { eval("var y = 2;"); x + 1; }; f(); let x;'); | |
100 TestAll('function f() { eval("var y = 2;"); x = 1; }; f(); let x;'); | |
101 TestAll('function f() { eval("var y = 2;"); x += 1; }; f(); let x;'); | |
102 TestAll('function f() { eval("var y = 2;"); ++x; }; f(); let x;'); | |
103 TestAll('function f() { eval("var y = 2;"); x++; }; f(); let x;'); | |
104 | |
105 // Test that variables introduced by function declarations are created and | |
106 // initialized upon entering a function / block scope. | |
107 function f() { | |
108 { | |
109 assertEquals(2, g1()); | |
110 assertEquals(2, eval("g1()")); | |
111 | |
112 // block scoped function declaration | |
113 function g1() { | |
114 return 2; | |
115 } | |
116 } | |
117 | |
118 assertEquals(3, g2()); | |
119 assertEquals(3, eval("g2()")); | |
120 // function scoped function declaration | |
121 function g2() { | |
122 return 3; | |
123 } | |
124 } | |
125 f(); | |
126 | |
127 // Test that a function declaration introduces a block scoped variable. | |
128 TestAll('{ function k() { return 0; } }; k(); '); | |
129 | |
130 // Test that a function declaration sees the scope it resides in. | |
131 function f2() { | |
132 let m, n, o, p; | |
133 { | |
134 m = g; | |
135 function g() { | |
136 return a; | |
137 } | |
138 let a = 1; | |
139 } | |
140 assertEquals(1, m()); | |
141 | |
142 try { | |
143 throw 2; | |
144 } catch(b) { | |
145 n = h; | |
146 function h() { | |
147 return b + c; | |
148 } | |
149 let c = 3; | |
150 } | |
151 assertEquals(5, n()); | |
152 | |
153 { | |
154 o = i; | |
155 function i() { | |
156 return d; | |
157 } | |
158 let d = 4; | |
159 } | |
160 assertEquals(4, o()); | |
161 | |
162 try { | |
163 throw 5; | |
164 } catch(e) { | |
165 p = j; | |
166 function j() { | |
167 return e + f; | |
168 } | |
169 let f = 6; | |
170 } | |
171 assertEquals(11, p()); | |
172 } | |
173 f2(); | |
174 | |
175 // Test that resolution of let bound variables works with scopes that call eval. | |
176 function outer() { | |
177 function middle() { | |
178 function inner() { | |
179 return x; | |
180 } | |
181 eval("1 + 1"); | |
182 return x + inner(); | |
183 } | |
184 | |
185 let x = 1; | |
186 return middle(); | |
187 } | |
188 | |
189 assertEquals(2, outer()); | |
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