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
|
// Any copyright is dedicated to the Public Domain.
// http://creativecommons.org/licenses/publicdomain/
load(libdir + "asserts.js")
const constructors = [
Int8Array,
Uint8Array,
Uint8ClampedArray,
Int16Array,
Uint16Array,
Int32Array,
Uint32Array,
Float32Array,
Float64Array
];
for (constructor of constructors) {
print("testing non-empty " + constructor.name);
let a = new constructor(10);
assertEq(Object.isExtensible(a), true);
assertEq(Object.isSealed(a), false);
assertEq(Object.isFrozen(a), false);
// Should complain that it can't change attributes of indexed typed array properties.
assertThrowsInstanceOf(() => Object.seal(a), TypeError);
// Should complain that it can't change attributes of indexed typed array properties.
assertThrowsInstanceOf(() => Object.freeze(a), TypeError);
}
print();
for (constructor of constructors) {
print("testing zero-length " + constructor.name);
let a = new constructor(0);
assertEq(Object.isExtensible(a), true);
assertEq(Object.isSealed(a), false);
assertEq(Object.isFrozen(a), false);
// Should not throw.
Object.seal(a);
Object.freeze(a);
}
// isSealed and isFrozen should not try to build an array of all the
// property names of a typed array, since they're often especially large.
// This should not throw an allocation error.
let a = new Uint8Array(1 << 24);
Object.isSealed(a);
Object.isFrozen(a);
for (constructor of constructors) {
print("testing extensibility " + constructor.name);
let a = new constructor(10);
// New named properties should show up on typed arrays.
a.foo = "twelve";
assertEq(a.foo, "twelve");
// New indexed properties should not show up on typed arrays.
a[20] = "twelve";
assertEq(a[20], undefined);
// Watch for especially large indexed properties.
a[-10 >>> 0] = "twelve";
assertEq(a[-10 >>> 0], undefined);
// Watch for really large indexed properties too.
a[Math.pow(2, 53)] = "twelve";
assertEq(a[Math.pow(2, 53)], undefined);
// Don't define old properties.
Object.defineProperty(a, 5, {value: 3});
assertEq(a[5], 3);
// Don't define new properties.
assertThrowsInstanceOf(() => Object.defineProperty(a, 20, {value: 3}), TypeError);
assertEq(a[20], undefined);
// Don't delete indexed properties.
a[3] = 3;
delete a[3];
assertEq(a[3], 3);
}
|
