js/src/tests/ecma_5/String/replace-math.js@6474c204b198 (annotated)
js/src/tests/ecma_5/String/replace-math.js
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* |
| michael@0 | 2 | * Any copyright is dedicated to the Public Domain. |
| michael@0 | 3 | * http://creativecommons.org/licenses/publicdomain/ |
| michael@0 | 4 | */ |
| michael@0 | 5 | |
| michael@0 | 6 | var BUGNUMBER = 805121; |
| michael@0 | 7 | var summary = "Be more careful with string math to avoid wrong results"; |
| michael@0 | 8 | |
| michael@0 | 9 | print(BUGNUMBER + ": " + summary); |
| michael@0 | 10 | |
| michael@0 | 11 | /******************************************************************************/ |
| michael@0 | 12 | |
| michael@0 | 13 | function puff(x, n) |
| michael@0 | 14 | { |
| michael@0 | 15 | while(x.length < n) |
| michael@0 | 16 | x += x; |
| michael@0 | 17 | return x.substring(0, n); |
| michael@0 | 18 | } |
| michael@0 | 19 | |
| michael@0 | 20 | var x = puff("1", 1 << 20); |
| michael@0 | 21 | var rep = puff("$1", 1 << 16); |
| michael@0 | 22 | |
| michael@0 | 23 | try |
| michael@0 | 24 | { |
| michael@0 | 25 | var y = x.replace(/(.+)/g, rep); |
| michael@0 | 26 | assertEq(y.length, Math.pow(2, 36)); |
| michael@0 | 27 | } |
| michael@0 | 28 | catch (e) |
| michael@0 | 29 | { |
| michael@0 | 30 | // OOM also acceptable |
| michael@0 | 31 | } |
| michael@0 | 32 | |
| michael@0 | 33 | /******************************************************************************/ |
| michael@0 | 34 | |
| michael@0 | 35 | if (typeof reportCompare === "function") |
| michael@0 | 36 | reportCompare(true, true); |
| michael@0 | 37 | |
| michael@0 | 38 | print("Tests complete"); |
