Problems with strict-mode caller poisoning

Brendan Eich brendan at mozilla.com
Wed Nov 21 01:18:11 PST 2012


Allen Wirfs-Brock wrote:
>>> On 11/16/2012 07:06 AM, Brendan Eich wrote:
>>>> >>>  So it seems to me premature to throw on [[GetOwnProperty]] of a strict function's 'caller'. It would be more precise, and avoid the problem you're hitting, to return a property descriptor with a censored .value,

Censored, yay. :-P

>>>>   or a poisoned-pill throwing-accessor .value.
>> >  
>> >  That may be plausible, but requires making the 'value' property an
>> >  accessor, and hence breaks with the idea that descriptors are just
>> >  "records". But maybe that is OK for this hack? We should at least be
>> >  careful to define it such that the meaning and behaviour of the
>> >  descriptor does_not_  vary in time, which would be weird at best.
>> >  I.e., its return value and/or poisoning has to be determined once when
>> >  [[GetOwnProperty]] is executed.
>
>
> Yes, property descriptor records can't act like accessors.  They are just specification internal records that indicate that a set of values is being passed around.  But we can censor the value that goes into the record.

Is this going into the bug?

/be


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