michael@0: /*
michael@0:  * Any copyright is dedicated to the Public Domain.
michael@0:  * http://creativecommons.org/licenses/publicdomain/
michael@0:  */
michael@0: 
michael@0: /* A stock watcher function. */
michael@0: var watcherCount;
michael@0: function watcher(id, old, newval) {
michael@0:     watcherCount++;
michael@0:     return newval; 
michael@0: }
michael@0: 
michael@0: /* Create an object with a value property. */
michael@0: var o = { w:2, x:3 };
michael@0: 
michael@0: /*
michael@0:  * Place a watchpoint on the value property. The watchpoint structure holds
michael@0:  * the original JavaScript setter, and a pointer to the shape.
michael@0:  */
michael@0: o.watch('x', watcher);
michael@0: 
michael@0: /*
michael@0:  * Put the object in dictionary mode, so that JSObject::putProperty will 
michael@0:  * mutate its shapes instead of creating new ones.
michael@0:  */
michael@0: delete o.w;
michael@0: 
michael@0: /*
michael@0:  * Replace the value property with a setter.
michael@0:  */
michael@0: var setterCount;
michael@0: o.__defineSetter__('x', function() { setterCount++; });
michael@0: 
michael@0: /*
michael@0:  * Trigger the watchpoint. The watchpoint handler should run, and then the
michael@0:  * setter should run.
michael@0:  */
michael@0: watcherCount = setterCount = 0;
michael@0: o.x = 4;
michael@0: assertEq(watcherCount, 1);
michael@0: assertEq(setterCount, 1);
michael@0: 
michael@0: reportCompare(true, true);