src: add internal isArrayBufferDetached #45568
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| @@ -560,6 +562,14 @@ function SideEffectFreeRegExpPrototypeExec(regex, string) { | |||
| return FunctionPrototypeCall(RegExpFromAnotherRealm.prototype.exec, regex, string); | |||
| } | |||
|
|
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| function isArrayBufferDetached(value) { | |||
| if (ArrayBufferPrototypeGetByteLength(value) === 0) { | |||
| return _isArrayBufferDetached(value); | |||
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Crossing the JS-C++ boundary is gonna be slower than the current implementation although I'm not sure if this call in the zero length case is gonna be the primary bottleneck for any user code.
Did you consider implementing @jasnell's suggestion in #45512 (comment)? Seems like that approach would solve this problem without adding any performance overhead in any case.
One thing we might be able to do is add a hidden symbol to ArrayBuffer instances when we detach them in c++ land. Then we can have an isDetached check in js that checks the length and the presence of that symbol.
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IMHO, that is the perfect solution for performance, but I believe it's too hacky to maintain in the long term. I can't think of a good/maintainable way to enforce attaching the hidden symbol as a rule.
If it's the consensus @jasnell thinks is the best way, I'll be happy to implement it regardless.
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| if (ArrayBufferPrototypeGetByteLength(value) === 0) { | ||
| return _isArrayBufferDetached(value); | ||
| } | ||
|
|
||
| return false; |
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Nit: the flow might look semantically better like this
Suggested change
| if (ArrayBufferPrototypeGetByteLength(value) === 0) { | |
| return _isArrayBufferDetached(value); | |
| } | |
| return false; | |
| if (ArrayBufferPrototypeGetByteLength(value) !== 0) { | |
| return false; | |
| } | |
| return _isArrayBufferDetached(value); |
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PR-URL: nodejs#45568 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: LiviaMedeiros <livia@cirno.name>
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Follow up on #45512