2013/9/12 Mark S. Miller erig...@google.com
Membranes need shadow targets, because of non-extensibility of objects and
non-configurability of properties. This special case of
no-invariants-anywhere is not JavaScript. Trying to do membranes without
shadow targets is a useless exercise.
True,
Le 13/09/2013 09:19, Tom Van Cutsem a écrit :
2013/9/12 Mark S. Miller erig...@google.com mailto:erig...@google.com
Membranes need shadow targets, because of non-extensibility of
objects and non-configurability of properties. This special case
of no-invariants-anywhere is not
2013/9/13 David Bruant bruan...@gmail.com
If one wants Object.getPrototypeOf to return the same object twice, the
membrane has to associate a new prototype with a given object. If there is
a shadow target, the place of where to store this object is pretty obvious
([[Prototype]]).
That said,
[+markm, allenwb]
2013/9/11 David Bruant bruan...@gmail.com
Le 11/09/2013 16:22, Tom Van Cutsem a écrit :
[[GetInheritance]] always checks whether the proxy and target's
prototype are the same, but as you pointed out, if the target is
extensible, you can set its prototype to some other
I'm willing to call them [[GetPrototypeOf]] and [[SetPrototypeOf]] to
match the trap names. I prefer avoiding a direct connotation with the
[[Prototype]] internal data property as an exotic object is not required to
have one.
I'm all for matching the internal method names with the trap and
On Thu, Sep 12, 2013 at 4:14 AM, Tom Van Cutsem tomvc...@gmail.com wrote:
[+markm, allenwb]
2013/9/11 David Bruant bruan...@gmail.com
Le 11/09/2013 16:22, Tom Van Cutsem a écrit :
[[GetInheritance]] always checks whether the proxy and target's
prototype are the same, but as you pointed
Le 12/09/2013 15:35, Mark S. Miller a écrit :
On Thu, Sep 12, 2013 at 4:14 AM, Tom Van Cutsem tomvc...@gmail.com
mailto:tomvc...@gmail.com wrote:
[+markm, allenwb]
But more generally, you're right that it's odd [[GetInheritance]]
is doing an invariant check on an otherwise
On Sep 12, 2013, at 6:35 AM, Mark S. Miller wrote:
On Thu, Sep 12, 2013 at 4:14 AM, Tom Van Cutsem tomvc...@gmail.com wrote:
[+markm, allenwb]
2013/9/11 David Bruant bruan...@gmail.com
Le 11/09/2013 16:22, Tom Van Cutsem a écrit :
[[GetInheritance]] always checks whether the proxy and
Membranes need shadow targets, because of non-extensibility of objects and
non-configurability of properties. This special case of
no-invariants-anywhere is not JavaScript. Trying to do membranes without
shadow targets is a useless exercise.
On Thu, Sep 12, 2013 at 8:03 AM, David Bruant
On 9/12/13 11:03 AM, David Bruant wrote:
If the code that runs
against your membrane is not expected to be allowed to change
extensiveness
It's absolutely expected to be allowed to do that. You should be able
to freeze objects coming from another global.
-Boris
Cc'ing Tom to make sure I tell no lies.
Boris Zbarsky mailto:bzbar...@mit.edu
September 10, 2013 9:10 PM
Hey all,
I was looking at implementing a membrane using ES6 proxies and ran
into a snag. Consider a situation where object A has prototype B. A'
is a proxy implementing the membrane,
Le 11/09/2013 06:10, Boris Zbarsky a écrit :
Hey all,
I was looking at implementing a membrane using ES6 proxies and ran
into a snag. Consider a situation where object A has prototype B. A'
is a proxy implementing the membrane, whose target is A.
But now if Object.getPrototypeOf(A') is
Le 11/09/2013 06:10, Boris Zbarsky a écrit :
I was looking at implementing a membrane using ES6 proxies
May I ask why you've been working on that? Is it related to the work on
WebIDL binding of DOM/browser objects?
One design goal of proxies was getting closer to self-hostability of the
2013/9/11 David Bruant bruan...@gmail.com
I think it was discussed at some point to get rid of the restriction on
the getPrototypeOf trap and enforce it only for non-extensible objects (but
I can't find the info anymore, I might just be inventing this...). It would
allow you to return a
2013/9/11 David Bruant bruan...@gmail.com
Le 11/09/2013 06:10, Boris Zbarsky a écrit :
Hey all,
I was looking at implementing a membrane using ES6 proxies and ran into a
snag. Consider a situation where object A has prototype B. A' is a proxy
implementing the membrane, whose target is
Le 11/09/2013 16:22, Tom Van Cutsem a écrit :
2013/9/11 David Bruant bruan...@gmail.com mailto:bruan...@gmail.com
I think it was discussed at some point to get rid of the
restriction on the getPrototypeOf trap and enforce it only for
non-extensible objects (but I can't find the info
On 9/11/13 5:14 AM, David Bruant wrote:
Le 11/09/2013 06:10, Boris Zbarsky a écrit :
I was looking at implementing a membrane using ES6 proxies
May I ask why you've been working on that?
It came up in the context of a discussion about how to handle __proto__
sets on WebIDL objects in Gecko
Le 11/09/2013 16:52, Boris Zbarsky a écrit :
One design goal of proxies was getting closer to self-hostability of the
DOM/browser APIs
Yeah, I was basically thinking about how I'd do Gecko's cross-global
wrappers with ES proxies (not that that's a reasonable thing to do,
since it requires
On 9/11/13 12:05 PM, David Bruant wrote:
In a self-hosted implementation, one would have to
re-implement the notion of current global and effective script
origin for the content it runs.
Ah, I see the issue.
I'm interested in self-hosting parts of the runtime, not in emulating an
entire
On 9/11/13 11:23 AM, David Bruant wrote:
Can you elaborate on these APIs?
In particular, the API that changes the current global and effective
script origin. That clearly can't be done from a script, since the
global and effective script origin while a script is running have to be
the
On Sep 11, 2013, at 8:53 AM, David Bruant wrote:
Le 11/09/2013 17:51, Allen Wirfs-Brock a écrit :
Ps: btw, wasn't GetInheritance supposed to be renamed GetPrototype?
I think we had agreement on that. Allen?
I'm willing to call them [[GetPrototypeOf]] and [[SetPrototypeOf]] to match
Le 11/09/2013 17:45, Boris Zbarsky a écrit :
On 9/11/13 11:23 AM, David Bruant wrote:
Can you elaborate on these APIs?
In particular, the API that changes the current global and effective
script origin. That clearly can't be done from a script, since the
global and effective script origin
Le 11/09/2013 17:51, Allen Wirfs-Brock a écrit :
Ps: btw, wasn't GetInheritance supposed to be renamed
GetPrototype?
I think we had agreement on that. Allen?
I'm willing to call them [[GetPrototypeOf]] and [[SetPrototypeOf]] to
match the trap names. I prefer avoiding a direct
On Sep 11, 2013, at 7:17 AM, Tom Van Cutsem wrote:
2013/9/11 David Bruant bruan...@gmail.com
Le 11/09/2013 06:10, Boris Zbarsky a écrit :
Hey all,
I was looking at implementing a membrane using ES6 proxies and ran into a
snag. Consider a situation where object A has prototype B. A'
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