This patch makes SpiderMonkey respect resumption values returned by
Debugger onEnterFrame handler functions, as documented.
In Debugger, we change fireEnterFrame to collect a resumption value from
the hook, and change onEnterFrame and slowPathOnEnterFrame to propagate
them out. These now need an 'rval' argument, so that they can return forced
return values and exceptions.
ScriptDebugPrologue now accepts a JSTrapStatus from Debugger::onEnterFrame,
takes care of placing the return value or exception where it belongs, and
returns a JSTrapStatus.
Calls to ScriptDebugPrologue now handle the JSTrapStatus:
- at the head of js::Interpret;
- in the JSOP_NEW/JSOP_CALL/JSOP_FUNCALL/JSOP_FUNAPPLY case;
- in stubs::ScriptDebugPrologue, which JM epilogues call; and
- in the REJOIN_THIS_PROTOTYPE case in js_InternalInterpret (you must add a
JS_GC call to ic::GetPropNoCache for Debugger-onEnterFrame-resumption-05.js to
hit this reliably).
We also rearrange the js_InternalThrow JSTrapStatus-handling switch statement to
have an explicit default case that raises a JS_NOT_REACHED assertion, instead of
just omitting JSTRAP_CONTINUE.
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