Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: a357eef6dd9359e1f73662ebc012b2f30c6b51df
https://github.com/WebKit/WebKit/commit/a357eef6dd9359e1f73662ebc012b2f30c6b51df
Author: Sosuke Suzuki <[email protected]>
Date: 2026-07-21 (Tue, 21 Jul 2026)
Changed paths:
M Source/JavaScriptCore/runtime/SymbolConstructor.cpp
Log Message:
-----------
[JSC] `Symbol.keyFor` should reuse the symbol's cached description string
https://bugs.webkit.org/show_bug.cgi?id=319843
Reviewed by Yusuke Suzuki.
Serializers call Symbol.keyFor on the same registered symbols while walking an
object graph, and each call allocates a fresh JSString even though Symbol
already caches that string in m_description for Symbol.prototype.description.
Return Symbol::description() instead, since a registered symbol's [[Key]] and
[[Description]] are the same string.
Baseline Patched
symbol-key-for-registered 16.4233+-0.1339 ^ 14.1917+-0.2452
^ definitely 1.1572x faster
* Source/JavaScriptCore/runtime/SymbolConstructor.cpp:
(JSC::JSC_DEFINE_HOST_FUNCTION):
Canonical link: https://commits.webkit.org/317661@main
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