Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: a3927f7a6cf7f4e378afa983cc11edf05e2dcdd4
https://github.com/WebKit/WebKit/commit/a3927f7a6cf7f4e378afa983cc11edf05e2dcdd4
Author: Daniel Liu <danl...@umich.edu>
Date: 2025-03-20 (Thu, 20 Mar 2025)
Changed paths:
M Source/JavaScriptCore/yarr/YarrJIT.cpp
Log Message:
-----------
YarrJIT should prune leading character classes and null ops for near-adjacent
character optimization
https://bugs.webkit.org/show_bug.cgi?id=290118
rdar://146934667
Reviewed by Yusuke Suzuki.
In 292003@main, we landed an optimization in YarrJIT for near-adjacent
PatternCharacter atoms. However,
this optimization could fail on patterns such as `[abc]d{2}ef`, since the
YarrJIT reorders checking the
more expensive character class `[abc]` after the constant terms `d{2}` and
`ef`. However, `d{2}` is not
supported by our optimization yet, so we begin at `ef`. The character class is
still added, at offset 0
of the operation list, creating holes which trick the optimization into
thinking there aren't any terms
in the constant pattern. By pruning off the initial character class and holes,
we ensure that only `ef`
is a part of the check, and the character class is handled separately later on.
* Source/JavaScriptCore/yarr/YarrJIT.cpp:
Canonical link: https://commits.webkit.org/292448@main
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