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Viewing changes to js/src/tests/ecma_5/extensions/watch-replaced-setter.js

  • Committer: Package Import Robot
  • Author(s): Rico Tzschichholz
  • Date: 2013-05-25 12:24:23 UTC
  • Revision ID: package-import@ubuntu.com-20130525122423-zmxucrhtensw90xy
Tags: upstream-17.0.0
Import upstream version 17.0.0

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js/src/tests/ecma_5/extensions/watch-replaced-setter.js
 
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/*
 
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 * Any copyright is dedicated to the Public Domain.
 
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 * http://creativecommons.org/licenses/publicdomain/
 
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 */
 
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/* A stock watcher function. */
 
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var watcherCount;
 
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function watcher(id, oldval, newval) { watcherCount++; return newval; }
 
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/* Create an object with a JavaScript setter. */
 
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var setterCount;
 
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var o = { w:2, set x(v) { setterCount++; } };
 
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/*
 
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 * Put the object in dictionary mode, so that JSObject::putProperty will 
 
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 * mutate its shapes instead of creating new ones.
 
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 */
 
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delete o.w;
 
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/*
 
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 * Place a watchpoint on the property. The watchpoint structure holds the
 
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 * original JavaScript setter, and a pointer to the shape.
 
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 */
 
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o.watch('x', watcher);
 
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/*
 
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 * Replace the accessor property with a value property. The shape's setter
 
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 * should become a non-JS setter, js_watch_set, and the watchpoint
 
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 * structure's saved setter should be updated (in this case, cleared).
 
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 */
 
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Object.defineProperty(o, 'x', { value:3,
 
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                                writable:true,
 
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                                enumerable:true,
 
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                                configurable:true });
 
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/*
 
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 * Assign to the property. This should trigger js_watch_set, which should
 
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 * call the handler, and then see that there is no JS-level setter to pass
 
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 * control on to, and return.
 
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 */
 
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watcherCount = setterCount = 0;
 
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o.x = 3;
 
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assertEq(watcherCount, 1);
 
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assertEq(setterCount, 0);
 
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reportCompare(true, true);