[webkit-changes] [WebKit/WebKit] e93f8a: Add bounds check to StringImpl::operator[]

[Chris Dumez]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: e93f8aa0c4f285e1bc9ac8dfc36ab6838e15d94e
      https://github.com/WebKit/WebKit/commit/e93f8aa0c4f285e1bc9ac8dfc36ab6838e15d94e
  Author: Chris Dumez <cdumez at apple.com>
  Date:   2023-10-30 (Mon, 30 Oct 2023)

  Changed paths:
    M Source/WTF/wtf/text/StringImpl.h
    M Source/WTF/wtf/text/WTFString.h

  Log Message:
  -----------
  Add bounds check to StringImpl::operator[]
https://bugs.webkit.org/show_bug.cgi?id=263899

Reviewed by Ryosuke Niwa.

Add bounds check to StringImpl::operator[] for extra safety. This
tested as performance neutral on Speedometer and Jetstream.

* Source/WTF/wtf/text/StringImpl.h:
(WTF::StringImpl::at const):
* Source/WTF/wtf/text/WTFString.h:
(WTF::String::characterAt const):

Canonical link: https://commits.webkit.org/269967@main