Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 9ef3e2eb29bf68df3e3072ec6431fd6e7d61f99f
https://github.com/WebKit/WebKit/commit/9ef3e2eb29bf68df3e3072ec6431fd6e7d61f99f
Author: Charlie Wolfe <[email protected]>
Date: 2026-09-29 (Tue, 29 Sep 2026)
Changed paths:
A LayoutTests/js/dom/window-proxy-prototype-navigation-expected.txt
A LayoutTests/js/dom/window-proxy-prototype-navigation.html
M Source/JavaScriptCore/runtime/JSObject.cpp
Log Message:
-----------
Avoid `haveABadTime()` when a prototype's chain already intercepts indexed
accesses
https://bugs.webkit.org/show_bug.cgi?id=325587
rdar://188662224
Reviewed by Yusuke Suzuki.
JSObject::setPrototypeDirect() calls haveABadTime() whenever a prototype gets a
chain that may
intercept indexed accesses. If the old chain already could, this is
unnecessary, since nothing
inheriting from it has fast indexed storage. That's the case for every
JSGlobalProxy retargeted on
navigation, since the proxy itself intercepts indexed accesses.
Now we only call it if the old chain could not intercept indexed accesses.
Test: js/dom/window-proxy-prototype-navigation.html
* LayoutTests/js/dom/window-proxy-prototype-navigation-expected.txt: Added.
* LayoutTests/js/dom/window-proxy-prototype-navigation.html: Added.
* Source/JavaScriptCore/runtime/JSObject.cpp:
(JSC::JSObject::setPrototypeDirect):
Canonical link: https://commits.webkit.org/322162@main
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