Bug 252790

Summary:	Produce 8 bit function toString() strings when possible
Product:	WebKit	Reporter:	Cameron McCormack (:heycam) <heycam>
Component:	JavaScriptCore	Assignee:	Cameron McCormack (:heycam) <heycam>
Status:	NEW ---
Severity:	Normal	CC:	webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Cameron McCormack (:heycam) 2023-02-22 18:25:32 PST

Some pages call Function.prototype.toString() on a function whose resulting string contains only 8 bit characters, but results in a 16 bit WTF::String due to the script source being stored in a 16 bit string.  This can end up wasting memory.  Let's see if perf allows us to check these strings' content and create an 8 bit string if possible.

Comment 1 Radar WebKit Bug Importer 2023-02-22 18:26:06 PST

<rdar://problem/105810084>

Comment 2 Cameron McCormack (:heycam) 2023-02-22 18:49:30 PST

Pull request: https://github.com/WebKit/WebKit/pull/10555