[[Set]] and inherited readonly data properties

[Mark S. Miller]

On Tue, Apr 1, 2014 at 3:09 AM, Axel Rauschmayer <axel at rauschma.de> wrote:

> On 01 Apr 2014, at 4:47 , Mark S. Miller <erights at google.com> wrote:
>
> > Unless the committee revisits the override mistake, which seems
> unlikely, the only way to cope that I know of is to use tamperProof(obj)
> where you would have used freeze(obj).
>
> What library does tamperProof() come from? I can’t seem to find it in Caja.
>

Once Caja (or just SES) is loaded, it is at cajaVM.tamperProof.

It's defined at <
https://code.google.com/p/google-caja/source/browse/trunk/src/com/google/caja/ses/repairES5.js#338>
and made available on the cajaVM object at <
https://code.google.com/p/google-caja/source/browse/trunk/src/com/google/caja/ses/startSES.js#1351>.
See also <
https://code.google.com/p/google-caja/source/browse/trunk/src/com/google/caja/ses/repairES5.js#241>
and <
https://code.google.com/p/google-caja/source/browse/trunk/src/com/google/caja/ses/startSES.js#468>
to understand some of the intricacies of getting the initialization order
of this right for SES purposes.

Often, tamperProof is used indirectly by Caja or SES code via
cajaVM.def(obj) <
https://code.google.com/p/google-caja/source/browse/trunk/src/com/google/caja/ses/startSES.js#1099>
which applies tamperProof to obj, and to all objects reachable from obj via
transitive reflective property and prototype traversal.


>
> Thanks!
>
> Axel
>
> --
> Dr. Axel Rauschmayer
> axel at rauschma.de
>
> home: rauschma.de
> twitter: twitter.com/rauschma
> blog: 2ality.com
>
>
>
>


-- 
    Cheers,
    --MarkM
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