js/src/tests/ecma_5/extensions/watch-value-prop-becoming-setter.js@6474c204b198 (annotated)
js/src/tests/ecma_5/extensions/watch-value-prop-becoming-setter.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 | /* A stock watcher function. */ |
| michael@0 | 7 | var watcherCount; |
| michael@0 | 8 | function watcher(id, old, newval) { |
| michael@0 | 9 | watcherCount++; |
| michael@0 | 10 | return newval; |
| michael@0 | 11 | } |
| michael@0 | 12 | |
| michael@0 | 13 | /* Create an object with a value property. */ |
| michael@0 | 14 | var o = { w:2, x:3 }; |
| michael@0 | 15 | |
| michael@0 | 16 | /* |
| michael@0 | 17 | * Place a watchpoint on the value property. The watchpoint structure holds |
| michael@0 | 18 | * the original JavaScript setter, and a pointer to the shape. |
| michael@0 | 19 | */ |
| michael@0 | 20 | o.watch('x', watcher); |
| michael@0 | 21 | |
| michael@0 | 22 | /* |
| michael@0 | 23 | * Put the object in dictionary mode, so that JSObject::putProperty will |
| michael@0 | 24 | * mutate its shapes instead of creating new ones. |
| michael@0 | 25 | */ |
| michael@0 | 26 | delete o.w; |
| michael@0 | 27 | |
| michael@0 | 28 | /* |
| michael@0 | 29 | * Replace the value property with a setter. |
| michael@0 | 30 | */ |
| michael@0 | 31 | var setterCount; |
| michael@0 | 32 | o.__defineSetter__('x', function() { setterCount++; }); |
| michael@0 | 33 | |
| michael@0 | 34 | /* |
| michael@0 | 35 | * Trigger the watchpoint. The watchpoint handler should run, and then the |
| michael@0 | 36 | * setter should run. |
| michael@0 | 37 | */ |
| michael@0 | 38 | watcherCount = setterCount = 0; |
| michael@0 | 39 | o.x = 4; |
| michael@0 | 40 | assertEq(watcherCount, 1); |
| michael@0 | 41 | assertEq(setterCount, 1); |
| michael@0 | 42 | |
| michael@0 | 43 | reportCompare(true, true); |
