Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 5f2a8878118543bfc97b64abd558e5c8e75e33f4
https://github.com/WebKit/WebKit/commit/5f2a8878118543bfc97b64abd558e5c8e75e33f4
Author: Sosuke Suzuki <[email protected]>
Date: 2026-07-20 (Mon, 20 Jul 2026)
Changed paths:
M Source/JavaScriptCore/runtime/JSONAtomStringCacheInlines.h
Log Message:
-----------
[JSC] `JSON.parse` should create 8-bit strings for Latin1 values in a 16-bit
input
https://bugs.webkit.org/show_bug.cgi?id=319782
Reviewed by Yusuke Suzuki.
When the input to JSON.parse is a 16-bit string (e.g. it contains a single
emoji anywhere),
LiteralParser<char16_t> creates every value string longer than 16 characters
via String(characters),
which is unconditionally 16-bit, even when the value itself is pure Latin1.
Keys and values up to
16 characters already go through AtomStringImpl::add, which uses
create8BitIfPossible.
This makes the value path use StringImpl::create8BitIfPossible as well,
matching V8, which decides
one-byte vs two-byte per string in its JSON parser.
* Source/JavaScriptCore/runtime/JSONAtomStringCacheInlines.h:
(JSC::JSONAtomStringCache::makeJSString):
Canonical link: https://commits.webkit.org/317566@main
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