Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 685247318fa25a58949852eac7ef2cae70be0d18
https://github.com/WebKit/WebKit/commit/685247318fa25a58949852eac7ef2cae70be0d18
Author: Sosuke Suzuki <[email protected]>
Date: 2026-03-12 (Thu, 12 Mar 2026)
Changed paths:
A JSTests/stress/array-prototype-copyWithin-primitive-this-toobject.js
M Source/JavaScriptCore/runtime/ArrayPrototype.cpp
Log Message:
-----------
[JSC] Array.prototype.copyWithin should return ToObject(this) when finalIndex
< from
https://bugs.webkit.org/show_bug.cgi?id=309769
Reviewed by Yusuke Suzuki.
Per spec[1], Array.prototype.copyWithin always returns the result of
ToObject(this value). When |this| is a primitive and the early return
path (finalIndex < from) is taken, we were returning the original
primitive value instead of the wrapper object.
[1]: https://tc39.es/ecma262/#sec-array.prototype.copywithin
Test: JSTests/stress/array-prototype-copyWithin-primitive-this-toobject.js
* JSTests/stress/array-prototype-copyWithin-primitive-this-toobject.js: Added.
(shouldBe):
(throw.new.Error):
* Source/JavaScriptCore/runtime/ArrayPrototype.cpp:
(JSC::JSC_DEFINE_HOST_FUNCTION):
Canonical link: https://commits.webkit.org/309182@main
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