[webkit-changes] [WebKit/WebKit] b348cf: [JSC] Handle 3 fiber rope string resolution effici...

[Yusuke Suzuki]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: b348cf2fe00510ece18c5e0e5d995a26aa82b2ca
      https://github.com/WebKit/WebKit/commit/b348cf2fe00510ece18c5e0e5d995a26aa82b2ca
  Author: Yusuke Suzuki <ysuzuki at apple.com>
  Date:   2024-12-28 (Sat, 28 Dec 2024)

  Changed paths:
    M Source/JavaScriptCore/runtime/JSStringInlines.h

  Log Message:
  -----------
  [JSC] Handle 3 fiber rope string resolution efficiently
https://bugs.webkit.org/show_bug.cgi?id=285215
rdar://142119083

Reviewed by Yijia Huang.

This patch makes 3 fiber rope string resolution more efficient.

1. When the first fiber (fiber0) is rope, then we do rope resolution
   without going to the slow path when stack height is enough.
   If it is not a rope, then we just spread it into the result buffer.
2. Then, we use 2 fiber rope string resolution with the remaining
   fibers.

* Source/JavaScriptCore/runtime/JSStringInlines.h:
(JSC::JSRopeString::resolveToBuffer):

Canonical link: https://commits.webkit.org/288318@main



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