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
|
// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --allow-natives-syntax
function Baseline() {
let array = new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
let it = array[Symbol.iterator]();
assertEquals(0, it.next().value);
assertEquals(1, it.next().value);
assertEquals(2, it.next().value);
%ArrayBufferDetach(array.buffer);
it.next();
};
%NeverOptimizeFunction(Baseline);
assertThrows(Baseline, TypeError,
"Cannot perform Array Iterator.prototype.next on a neutered ArrayBuffer");
function Turbo(count = 10000) {
let array = Array(10000);
for (let i = 0; i < 10000; ++i) {
array[i] = 254;
}
array[5000] = 255;
array = new Uint8Array(array);
let sum = 0;
let it = array[Symbol.iterator]();
for (let i = 0; i < count; ++i) {
let result = it.next();
if (result.value === 255) {
%ArrayBufferDetach(array.buffer);
}
sum += result.value;
}
return sum;
}
%PrepareFunctionForOptimization(Turbo);
Turbo(10);
Turbo(10);
%OptimizeFunctionOnNextCall(Turbo);
assertThrows(Turbo, TypeError,
"Cannot perform Array Iterator.prototype.next on a neutered ArrayBuffer");
|
