js/src/jit-test/tests/arrays/setelem-one-past-nonwritable-length.js@ac0c01689b40 (annotated)
js/src/jit-test/tests/arrays/setelem-one-past-nonwritable-length.js
Thu, 15 Jan 2015 15:59:08 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 15:59:08 +0100
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
- permissions
- -rw-r--r--
Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | function f(arr, i, v) |
| michael@0 | 2 | { |
| michael@0 | 3 | arr[i] = v; |
| michael@0 | 4 | } |
| michael@0 | 5 | |
| michael@0 | 6 | function test() |
| michael@0 | 7 | { |
| michael@0 | 8 | // Use a much-greater capacity than the eventual non-writable length. |
| michael@0 | 9 | var a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]; |
| michael@0 | 10 | Object.defineProperty(a, "length", { writable: false, value: 6 }); |
| michael@0 | 11 | |
| michael@0 | 12 | for (var i = 0; i < 100; i++) |
| michael@0 | 13 | f(a, a.length, i); |
| michael@0 | 14 | |
| michael@0 | 15 | assertEq(a.hasOwnProperty(6), false); |
| michael@0 | 16 | assertEq(a[6], undefined); |
| michael@0 | 17 | assertEq(a.length, 6); |
| michael@0 | 18 | } |
| michael@0 | 19 | |
| michael@0 | 20 | test(); |
