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Normative: Lookup constructor.resolve only once in PerformPromise{All, Race} #1506

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merged 1 commit into from
Jun 15, 2019
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Normative: Lookup constructor.resolve only once in PerformPromise{All, Race} #1506

merged 1 commit into from
Jun 15, 2019

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gsathya
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@gsathya gsathya commented Apr 11, 2019

Fixes #1505

@gsathya gsathya mentioned this pull request Apr 11, 2019
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The proposed spec text seems correct.

@mathiasbynens mathiasbynens added needs test262 tests The proposal should specify how to test an implementation. Ideally via github.com/tc39/test262 normative change Affects behavior required to correctly evaluate some ECMAScript source text labels Apr 11, 2019
@zenparsing zenparsing added the needs consensus This needs committee consensus before it can be eligible to be merged. label Apr 11, 2019
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bakkot commented Apr 11, 2019

Early throwing also matches Map etc, which check before iteration. (They do Get + IsCallable rather than GetMethod.)

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gsathya commented Apr 11, 2019

Early throwing also matches Map etc, which check before iteration. (They do Get + IsCallable rather than GetMethod.)

SGTM, I hear folks like consistency. PR updated.

@ljharb ljharb self-assigned this Apr 11, 2019
leobalter added a commit to leobalter/test262 that referenced this pull request Apr 17, 2019
@leobalter
Add tests for Promise.all|race resolve lookup
f1f495b 
Ref tc39/ecma262#1506
@leobalter leobalter mentioned this pull request Apr 17, 2019
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leobalter added a commit to leobalter/test262 that referenced this pull request Apr 24, 2019
@leobalter
Add tests for Promise.all|race resolve lookup
18faa66 
Ref tc39/ecma262#1506
leobalter added a commit to leobalter/test262 that referenced this pull request Apr 24, 2019
@leobalter
Add tests for Promise.all|race resolve lookup
b646cf6 
Ref tc39/ecma262#1506
oleavr pushed a commit to frida/v8 that referenced this pull request Apr 26, 2019
@gsathya
[promise] Lookup the resolve property only once
9c0c876 
In the PerformPromise{All, Race, AllSettled} operations, the resolve
property of the constructor is looked up only once.

In the implementation, for the fast path, where the constructor's
resolve property is untainted, the resolve function is set to undefined.
Since undefined can't be a valid value for the resolve function,
we can switch on it (in CallResolve) to directly call the  PromiseResolve
builtin. If the resolve property is tainted, we do an observable property
lookup, save this value, and call this property later (in CallResolve).

I ran this CL against the test262 tests locally and they all pass:
tc39/test262#2131

Spec:
- tc39/ecma262#1506
- tc39/proposal-promise-allSettled#40

Bug: v8:9152
Change-Id: Icb36a90b5a244a67a729611c7b3315d2c29de6e9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1574705
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60957}
zloirock added a commit to zloirock/core-js that referenced this pull request May 2, 2019
@zloirock
lookup PromiseConstructor.resolve only once in Promise combinators
d6f6d0b 
per tc39/ecma262#1506
@gsathya gsathya added has consensus This has committee consensus. and removed needs consensus This needs committee consensus before it can be eligible to be merged. labels Jun 6, 2019
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gsathya commented Jun 6, 2019

This has reached consensus at the TC39 meeting today.

@ljharb ljharb added has test262 tests and removed needs test262 tests The proposal should specify how to test an implementation. Ideally via github.com/tc39/test262 labels Jun 6, 2019
@zenparsing zenparsing mentioned this pull request Jun 6, 2019
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@ljharb ljharb force-pushed the optimize-promise-resolve-lookup branch from 295858d to 25745fe Compare June 15, 2019 22:44
@ljharb ljharb merged commit 25745fe into tc39:master Jun 15, 2019
@ljharb ljharb changed the title Lookup constructor.resolve only once in PerformPromise{All, Race} Normative: Lookup constructor.resolve only once in PerformPromise{All, Race} Jun 15, 2019
caiolima pushed a commit to caiolima/webkit that referenced this pull request Jun 20, 2019
Optimize resolve method lookup in Promise static methods
7bff1ab 
https://bugs.webkit.org/show_bug.cgi?id=198864

Patch by Alexey Shvayka <shvaikalesh@gmail.com> on 2019-06-19
Reviewed by Yusuke Suzuki.

JSTests:

* test262/expectations.yaml: Mark 18 test cases as passing.

Source/JavaScriptCore:

Lookup `resolve` method only once in Promise.{all,allSettled,race}.
(tc39/ecma262#1506)

Already implemented in V8.

* builtins/PromiseConstructor.js:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@246620 268f45cc-cd09-0410-ab3c-d52691b4dbfc
ryanhaddad pushed a commit to WebKit/WebKit that referenced this pull request Dec 22, 2020
@shvaikalesh @webkit-commit-queue
Optimize resolve method lookup in Promise static methods
83b3a1e 
https://bugs.webkit.org/show_bug.cgi?id=198864

Patch by Alexey Shvayka <shvaikalesh@gmail.com> on 2019-06-19
Reviewed by Yusuke Suzuki.

JSTests:

* test262/expectations.yaml: Mark 18 test cases as passing.

Source/JavaScriptCore:

Lookup `resolve` method only once in Promise.{all,allSettled,race}.
(tc39/ecma262#1506)

Already implemented in V8.

* builtins/PromiseConstructor.js:

Canonical link: https://commits.webkit.org/213010@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@246620 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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Lookup resolve property only once in PerformPromiseAll and PerformPromiseRace
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@gsathya @bakkot @ljharb @littledan @leobalter @gibson042 @zenparsing @mathiasbynens