From: Dominik Csapak <d.csapak@proxmox.com>
To: Thomas Lamprecht <t.lamprecht@proxmox.com>,
Dietmar Maurer <dietmar@proxmox.com>,
Wolfgang Bumiller <w.bumiller@proxmox.com>
Cc: pmg-devel@lists.proxmox.com
Subject: Re: [pmg-devel] applied: [PATCH] panel/acme-domains: fix cyclic dependency in view model
Date: Wed, 24 Mar 2021 08:31:39 +0100 [thread overview]
Message-ID: <1652ef3e-d29c-45a4-8dfa-09db3322260b@proxmox.com> (raw)
In-Reply-To: <28ca9b85-a8fd-d204-5586-07657c3ecaaa@proxmox.com>
On 3/24/21 08:21, Thomas Lamprecht wrote:
> On 23.03.21 19:22, Dietmar Maurer wrote:
>>> So, if on evaluation a get(X) is missed due to it being not always called,
>>> like with boolean statements where a single truthy is enough for an or expression
>>> like above, that data dependency is lost and one may see bug like behaviour.
>>>
>>> Use intermediate variables to combat that, for example, above `accountValueHidden`
>>> formula should read:
>>>
>>> accountValueHidden: (get) => {
>>> let editable = get('accountEditable'), available = get('accountsAvailable');
>>> return !editable || !available;
>>> },
>>
>> I guess a good JIT can still optimize that away?
>>
>
>
> You're right, that may be the case.
> Albeit, I guess that for such short method where the JS engine cannot know if it is
> a "hot" function (lots calls) so the JIT won't be used initially, and the interpreter
> probably isn't smart enough to detect this optimization.
>
> At least above approach helped a bit ago when I ran in such a bug, but yeah, it may
> not be really future proof...
>
>
but AFAIR, extjs actually parses the function *text* to find the
data dependencies (see
https://docs.sencha.com/extjs/6.0.1/classic/src/Formula.js.html)
and i hope that the JIT does not change the text of the function
at all....
next prev parent reply other threads:[~2021-03-24 7:31 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-23 18:22 Dietmar Maurer
2021-03-24 7:21 ` Thomas Lamprecht
2021-03-24 7:31 ` Dominik Csapak [this message]
2021-03-24 7:34 ` Thomas Lamprecht
-- strict thread matches above, loose matches on Subject: below --
2021-03-23 16:29 Thomas Lamprecht
2021-03-23 17:27 ` Thomas Lamprecht
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