Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 8cfdd1d58057ff6fa49d2918b1d853368fdc7c25
https://github.com/WebKit/WebKit/commit/8cfdd1d58057ff6fa49d2918b1d853368fdc7c25
Author: Sosuke Suzuki <[email protected]>
Date: 2026-03-12 (Thu, 12 Mar 2026)
Changed paths:
A JSTests/stress/regexp-prototype-matchall-lastindex-tolength.js
M Source/JavaScriptCore/runtime/RegExpPrototype.cpp
Log Message:
-----------
[JSC] `RegExp#@@matchAll` fast path should clamp lastIndex > 2^53-1 to 2^53-1
https://bugs.webkit.org/show_bug.cgi?id=309470
Reviewed by Yusuke Suzuki.
The fast path in regExpProtoFuncMatchAll incorrectly treated lastIndex values
exceeding Number.MAX_SAFE_INTEGER as 0. Per spec, ToLength clamps such values
to 2^53-1[1][2]. Regression from 4b4cd07889.
[1]: https://tc39.es/ecma262/#sec-string.prototype.matchall
[2]: https://tc39.es/ecma262/#sec-tolength
Test: JSTests/stress/regexp-prototype-matchall-lastindex-tolength.js
* JSTests/stress/regexp-prototype-matchall-lastindex-tolength.js: Added.
(shouldBe):
(testSlowPath.MyRegExp):
(testSlowPath):
* Source/JavaScriptCore/runtime/RegExpPrototype.cpp:
(JSC::JSC_DEFINE_HOST_FUNCTION):
Canonical link: https://commits.webkit.org/309129@main
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