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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-block-scoping | |
29 | |
30 // Test temporal dead zone semantics of let bound variables in | |
31 // function and block scopes. | |
32 | |
33 function TestFunctionLocal(s) { | |
34 try { | |
35 eval("(function(){" + s + "; })")(); | |
36 } catch (e) { | |
fschneider
2011/08/30 06:58:40
Use AssertThrows?
| |
37 assertInstanceof(e, ReferenceError); | |
38 return; | |
39 } | |
40 assertUnreachable(); | |
41 } | |
42 | |
43 function TestBlockLocal(s,e) { | |
44 try { | |
45 eval("(function(){ {" + s + ";} })")(); | |
fschneider
2011/08/30 06:58:40
AssertThrows here too.
| |
46 } catch (e) { | |
47 assertInstanceof(e, ReferenceError); | |
48 return; | |
49 } | |
50 assertUnreachable(); | |
51 } | |
52 | |
53 | |
54 function TestAll(s) { | |
55 TestBlockLocal(s); | |
56 TestFunctionLocal(s); | |
57 } | |
58 | |
59 // Use before initialization in declaration statement. | |
60 TestAll('let x = x + 1'); | |
61 TestAll('let x = x += 1'); | |
62 TestAll('let x = x++'); | |
63 TestAll('let x = ++x'); | |
64 | |
65 // Use before initialization in prior statement. | |
66 TestAll('x + 1; let x;'); | |
67 TestAll('x = 1; let x;'); | |
68 TestAll('x += 1; let x;'); | |
69 TestAll('++x; let x;'); | |
70 TestAll('x++; let x;'); | |
71 | |
72 TestAll('f(); let x; function f() { return x + 1; }'); | |
73 TestAll('f(); let x; function f() { x = 1; }'); | |
74 TestAll('f(); let x; function f() { x += 1; }'); | |
75 TestAll('f(); let x; function f() { ++x; }'); | |
76 TestAll('f(); let x; function f() { x++; }'); | |
77 | |
78 TestAll('f()(); let x; function f() { return function() { return x + 1; } }'); | |
79 TestAll('f()(); let x; function f() { return function() { x = 1; } }'); | |
80 TestAll('f()(); let x; function f() { return function() { x += 1; } }'); | |
81 TestAll('f()(); let x; function f() { return function() { ++x; } }'); | |
82 TestAll('f()(); let x; function f() { return function() { x++; } }'); | |
83 | |
84 // Use in before initialization with a dynamic lookup. | |
85 TestAll('eval("x + 1;"); let x;'); | |
86 TestAll('eval("x = 1;"); let x;'); | |
87 TestAll('eval("x += 1;"); let x;'); | |
88 TestAll('eval("++x;"); let x;'); | |
89 TestAll('eval("x++;"); let x;'); | |
90 | |
91 // Test that variables introduced by function declarations are created and | |
92 // initialized upon entering a function / block scope. | |
93 function f() { | |
94 { | |
95 assertEquals(2, g1()); | |
96 assertEquals(2, eval("g1()")); | |
97 | |
98 // block scoped function declaration | |
99 function g1() { | |
100 return 2; | |
101 } | |
102 } | |
103 | |
104 assertEquals(3, g2()); | |
105 assertEquals(3, eval("g2()")); | |
106 // function scoped function declaration | |
107 function g2() { | |
108 return 3; | |
109 } | |
110 } | |
111 f(); | |
112 | |
113 // Test that a function declaration introduces a block scoped variable. | |
114 TestAll('{ function k() { return 0; } }; k(); '); | |
115 | |
116 // Test that a function declaration sees the scope it resides in. | |
117 function f2() { | |
118 let m, n; | |
119 { | |
120 m = g; | |
121 function g() { | |
122 return a; | |
123 } | |
124 let a = 1; | |
125 } | |
126 assertEquals(1, m()); | |
127 | |
128 try { | |
129 throw 2; | |
130 } catch(b) { | |
131 n = h; | |
132 function h() { | |
133 return b + c; | |
134 } | |
135 let b = 3; | |
136 } | |
137 assertEquals(5, n()); | |
138 } | |
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