The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/js/src/tests/ecma_5/extensions/watch-setter-become-setter.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,44 @@
     1.4 +/*
     1.5 + * Any copyright is dedicated to the Public Domain.
     1.6 + * http://creativecommons.org/licenses/publicdomain/
     1.7 + */
     1.8 +
     1.9 +/* Create an object with a JavaScript setter. */
    1.10 +var firstSetterCount;
    1.11 +var o = { w:2, set x(v) { firstSetterCount++; } };
    1.12 +
    1.13 +/*
    1.14 + * Put the object in dictionary mode, so that JSObject::putProperty will 
    1.15 + * mutate its shapes instead of creating new ones.
    1.16 + */
    1.17 +delete o.w;
    1.18 +
    1.19 +/* A stock watcher function. */
    1.20 +var watcherCount;
    1.21 +function watcher(id, oldval, newval) { watcherCount++; return newval; }
    1.22 +
    1.23 +/*
    1.24 + * Place a watchpoint on the property. The property's shape now has the
    1.25 + * watchpoint setter, with the original setter saved in the watchpoint
    1.26 + * structure.
    1.27 + */
    1.28 +o.watch('x', watcher);
    1.29 +
    1.30 +/*
    1.31 + * Replace the setter with a new setter. The shape should get updated to
    1.32 + * refer to the new setter, and then the watchpoint setter should be
    1.33 + * re-established.
    1.34 + */
    1.35 +var secondSetterCount;
    1.36 +Object.defineProperty(o, 'x', { set: function () { secondSetterCount++ } });
    1.37 +
    1.38 +/*
    1.39 + * Assign to the property. This should trigger the watchpoint and the new setter.
    1.40 + */
    1.41 +watcherCount = firstSetterCount = secondSetterCount = 0;
    1.42 +o.x = 3;
    1.43 +assertEq(watcherCount, 1);
    1.44 +assertEq(firstSetterCount, 0);
    1.45 +assertEq(secondSetterCount, 1);
    1.46 +
    1.47 +reportCompare(true, true);