Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 0aef258bf9a077cad0a2a3ed2201210588d51a63
https://github.com/WebKit/WebKit/commit/0aef258bf9a077cad0a2a3ed2201210588d51a63
Author: Sosuke Suzuki <[email protected]>
Date: 2026-05-07 (Thu, 07 May 2026)
Changed paths:
M Source/JavaScriptCore/yarr/YarrPattern.h
M Source/JavaScriptCore/yarr/generateYarrUnicodePropertyTables.py
Log Message:
-----------
[YARR] Encode Unicode property tables as `constexpr` data instead of inline
construction code
https://bugs.webkit.org/show_bug.cgi?id=314281
Reviewed by Yusuke Suzuki.
Yarr's `\p{...}` character classes are constructed by generated
createCharacterClassN() functions, which together account for ~468 KB of
__TEXT,__text in a Release arm64 build. createCharacterClass367 (RGI_Emoji)
alone is 124 KB.
Two issues:
1. Emoji string sequence classes emit thousands of inline
Vector<char32_t>(std::span) constructions. Vector is not trivially
constructible, so each becomes ~38 bytes of code.
2. CharacterRange's constructor is not constexpr, so
std::initializer_list<CharacterRange> backing arrays cannot be placed in
read-only data and are built element-by-element on the stack at runtime.
Fix (1) by emitting a flat constexpr char32_t data array plus a constexpr
per-string length array, and reconstructing m_strings with a small loop.
Fix (2) by marking CharacterRange's constructor constexpr.
This reduces these functions from ~468 KB to ~63 KB of code, with ~150 KB of
data moving to __TEXT,__const, for a net binary size reduction of ~283 KB.
No change to RegExp matching performance; RegExp compilation of emoji
property escapes is slightly faster.
* Source/JavaScriptCore/yarr/YarrPattern.h:
(JSC::Yarr::CharacterRange::CharacterRange):
* Source/JavaScriptCore/yarr/generateYarrUnicodePropertyTables.py:
(PropertyData.dumpStringTables):
(PropertyData.dump):
(PropertyData.convertStringToCppFormat): Deleted.
Canonical link: https://commits.webkit.org/312790@main
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