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Normative: Return false in [[PreventExtensions]] for variable length TypedArrays #3453

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Normative: Return false in [[PreventExtensions]] for variable length TypedArrays #3453

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@syg syg commented Oct 18, 2024

Fixes #3385

@syg syg added normative change Affects behavior required to correctly evaluate some ECMAScript source text has consensus This has committee consensus. labels Oct 18, 2024
@syg syg requested a review from a team October 18, 2024 19:24
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syg commented Oct 18, 2024

Doesn't have test262 tests yet at time of this comment.

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anba commented Oct 18, 2024

https://tc39.es/ecma262/#sec-typedarray-exotic-objects and https://tc39.es/ecma262/#sec-typedarraycreate need to be updated to mention the new [[PreventExtensions]] override.

@syg syg added the needs test262 tests The proposal should specify how to test an implementation. Ideally via github.com/tc39/test262 label Oct 18, 2024
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@@ -41830,6 +41844,22 @@ <h1>
1. Return ~unused~.
</emu-alg>
</emu-clause>

<emu-clause id="sec-isfixedlengthtypedarray" type="abstract operation">
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I would put this up with IsTypedArrayOutOfBounds. This section is only really for the initialization-related AOs.

Also since this takes a TA, it should be IsTypedArrayFixedLength: it asks a question about a TA, rather than determining whether an arbitrary object is a fixed-length TA.

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Sure, moving it sounds good.

Re: IsTypedArrayFixedLength name, this was to be consistent with IsFixedLengthArrayBuffer. We can change both though as a followup, I have no issue with your suggestion.

syg added a commit to syg/test262 that referenced this pull request Nov 13, 2024
@syg
Update Object.freeze tests for resizable TypedArrays
fff5521 
Object.freeze will always throw on variable-length TAs with this
has-consensus PR: tc39/ecma262#3453
@syg syg mentioned this pull request Nov 13, 2024
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hubot pushed a commit to v8/v8 that referenced this pull request Nov 13, 2024
@syg
[rab/gsab] Return false in [[PreventExtensions]] for variable-length TAs
4ff7b07 
This is a spec normative change: tc39/ecma262#3453

Fixed: 374310073
Change-Id: I085260fea077bc27cf1e4f06d4389519e12c4e14
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/6014979
Commit-Queue: Shu-yu Guo <[email protected]>
Auto-Submit: Shu-yu Guo <[email protected]>
Commit-Queue: Rezvan Mahdavi Hezaveh <[email protected]>
Reviewed-by: Rezvan Mahdavi Hezaveh <[email protected]>
Cr-Commit-Position: refs/heads/main@{#97166}
test262-pr-bot pushed a commit to tc39/test262 that referenced this pull request Nov 13, 2024
@syg
[rab/gsab] Return false in [[PreventExtensions]] for variable-length TAs
d1d82e0 
This is a spec normative change: tc39/ecma262#3453

Fixed: 374310073
Change-Id: I085260fea077bc27cf1e4f06d4389519e12c4e14
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/6014979
Commit-Queue: Shu-yu Guo <[email protected]>
Auto-Submit: Shu-yu Guo <[email protected]>
Commit-Queue: Rezvan Mahdavi Hezaveh <[email protected]>
Reviewed-by: Rezvan Mahdavi Hezaveh <[email protected]>
Cr-Commit-Position: refs/heads/main@{#97166}
@test262-pr-bot test262-pr-bot mentioned this pull request Nov 13, 2024
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test262-merge-bot pushed a commit to tc39/test262 that referenced this pull request Nov 13, 2024
@syg @test262-merge-bot
[rab/gsab] Return false in [[PreventExtensions]] for variable-length TAs
05c45a4 
This is a spec normative change: tc39/ecma262#3453

Fixed: 374310073
Change-Id: I085260fea077bc27cf1e4f06d4389519e12c4e14
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/6014979
Commit-Queue: Shu-yu Guo <[email protected]>
Auto-Submit: Shu-yu Guo <[email protected]>
Commit-Queue: Rezvan Mahdavi Hezaveh <[email protected]>
Reviewed-by: Rezvan Mahdavi Hezaveh <[email protected]>
Cr-Commit-Position: refs/heads/main@{#97166}
@syg syg 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 Nov 13, 2024
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TypedArray exotic objects need [[PreventExtensions]]
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