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→Accessor Properties of the Debugger.Frame Prototype Object: onPop handlers receive function body return values, not necessarily the constructed object.
(→Accessor Properties of the Debugger.Frame Prototype Object: onPop is only ignored on "debugger" frames.) |
(→Accessor Properties of the Debugger.Frame Prototype Object: onPop handlers receive function body return values, not necessarily the constructed object.) |
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Calls to frames' <code>onPop</code> handlers are cross-compartment, intra-thread calls: an <code>onPop</code> function must be in the debugger's compartment (and thus calls to it take place in the debugger's compartment), and the call takes place in the thread to which the frame belongs. | Calls to frames' <code>onPop</code> handlers are cross-compartment, intra-thread calls: an <code>onPop</code> function must be in the debugger's compartment (and thus calls to it take place in the debugger's compartment), and the call takes place in the thread to which the frame belongs. | ||
When an <code>onPop</code> call reports the completion of a construction call (that is, a function called via the <code>new</code> operator), the completion value passed to the handler describes the value returned by the function body. If this value is not an object, it may be different from the value produced by the <code>new</code> expression, which will be the value of the frame's <code>this</code> property. (In ECMAScript terms, the <code>onPop</code> handler receives the value returned by the <code><nowiki>[[Call]]</nowiki></code> method, not the value returned by the <code><nowiki>[[Construct]]</nowiki></code> method.) | |||
When a debugger handler function forces a frame to complete early, by returning a <code>{ return:... }</code>, <code>{ throw:... }</code>, or <code>null</code> resumption value, SpiderMonkey calls the frame's <code>onPop</code> handler, if any. The completion value passed in this case reflects the resumption value that caused the frame to complete. | When a debugger handler function forces a frame to complete early, by returning a <code>{ return:... }</code>, <code>{ throw:... }</code>, or <code>null</code> resumption value, SpiderMonkey calls the frame's <code>onPop</code> handler, if any. The completion value passed in this case reflects the resumption value that caused the frame to complete. | ||