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[immutable-arraybuffer] add support for immutable array buffer #1598

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[immutable-arraybuffer] add support for immutable array buffer #1598

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21 changes: 19 additions & 2 deletions index.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -91,6 +91,9 @@ urlPrefix: https://tc39.es/ecma262/; spec: ecmascript
url: sec-object-type
text: is an Object
text: is not an Object
urlPrefix: https://tc39.es/proposal-immutable-arraybuffer/; spec: PROPOSAL-IMMUTABLE-ARRAYBUFFER
type: abstract-op
text: AllocateImmutableArrayBuffer; url: sec-allocateimmutablearraybuffer
</pre>

<pre class=biblio>
Expand All @@ -99,6 +102,11 @@ urlPrefix: https://tc39.es/ecma262/; spec: ecmascript
"publisher": "Ecma",
"href": "https://tc39.es/proposal-float16array/",
"title": "Proposal to add float16 TypedArrays to JavaScript"
},
"PROPOSAL-IMMUTABLE-ARRAYBUFFER": {
"publisher": "Ecma",
"href": "https://tc39.es/proposal-immutable-arraybuffer/",
"title": "Immutable ArrayBuffers"
}
}
</pre>
Expand Down Expand Up @@ -9266,16 +9274,25 @@ a reference to the same object that the IDL value represents.

<hr>

<div algorithm>
<div algorithm="ArrayBuffer/create">
To <dfn export for="ArrayBuffer">create</dfn> an {{ArrayBuffer}} from a [=byte sequence=]
|bytes| in a [=realm=] |realm|:
|bytes| in a [=realm=] |realm|, optionally given an
<dfn export for="ArrayBuffer/create">|immutable|</dfn> boolean (default
<emu-val>false</emu-val>):

1. Let |jsArrayBuffer| be [=?=]
[$AllocateArrayBuffer$](|realm|.\[[Intrinsics]].\[[{{%ArrayBuffer%}}]], |bytes|'s
[=byte sequence/length=]).
1. Let |arrayBuffer| be the result of [=converted to an IDL value|converting=] |jsArrayBuffer|
to an IDL value of type {{ArrayBuffer}}.
1. [=ArrayBuffer/Write=] |bytes| into |arrayBuffer|.
1. If |immutable| is <emu-val>true</emu-val>, then:
1. Set |jsArrayBuffer| to [=?=]
[$AllocateImmutableArrayBuffer$](|realm|.\[[Intrinsics]].\[[{{%ArrayBuffer%}}]],
|bytes|'s [=byte sequence/length=], |jsArrayBuffer|.\[[ArrayBufferData]], 0,
|bytes|'s [=byte sequence/length=]).
1. Set |arrayBuffer| to the result of [=converted to an IDL value|converting=]
|jsArrayBuffer| to an IDL value of type {{ArrayBuffer}}.

@annevk annevk May 8, 2026

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Now the immutable branch ends up doing a bunch of work twice. I think this can be structured a bit better.

1. Return |arrayBuffer|.
</div>

Expand Down