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-replaced-setter.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,46 @@
     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 +/* A stock watcher function. */
    1.10 +var watcherCount;
    1.11 +function watcher(id, oldval, newval) { watcherCount++; return newval; }
    1.12 +
    1.13 +/* Create an object with a JavaScript setter. */
    1.14 +var setterCount;
    1.15 +var o = { w:2, set x(v) { setterCount++; } };
    1.16 +
    1.17 +/*
    1.18 + * Put the object in dictionary mode, so that JSObject::putProperty will 
    1.19 + * mutate its shapes instead of creating new ones.
    1.20 + */
    1.21 +delete o.w;
    1.22 +
    1.23 +/*
    1.24 + * Place a watchpoint on the property. The watchpoint structure holds the
    1.25 + * original JavaScript setter, and a pointer to the shape.
    1.26 + */
    1.27 +o.watch('x', watcher);
    1.28 +
    1.29 +/*
    1.30 + * Replace the accessor property with a value property. The shape's setter
    1.31 + * should become a non-JS setter, js_watch_set, and the watchpoint
    1.32 + * structure's saved setter should be updated (in this case, cleared).
    1.33 + */
    1.34 +Object.defineProperty(o, 'x', { value:3,
    1.35 +                                writable:true,
    1.36 +                                enumerable:true,
    1.37 +                                configurable:true });
    1.38 +
    1.39 +/*
    1.40 + * Assign to the property. This should trigger js_watch_set, which should
    1.41 + * call the handler, and then see that there is no JS-level setter to pass
    1.42 + * control on to, and return.
    1.43 + */
    1.44 +watcherCount = setterCount = 0;
    1.45 +o.x = 3;
    1.46 +assertEq(watcherCount, 1);
    1.47 +assertEq(setterCount, 0);
    1.48 +
    1.49 +reportCompare(true, true);