[webkit-changes] [WebKit/WebKit] 77b468: Array.prototype.indexOf constant-folding should ac...

[EWS]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 77b468c0b1d1db870032d003bc9cd33d2012b6e4
      https://github.com/WebKit/WebKit/commit/77b468c0b1d1db870032d003bc9cd33d2012b6e4
  Author: Alexey Shvayka <ashvayka at apple.com>
  Date:   2022-11-11 (Fri, 11 Nov 2022)

  Changed paths:
    A JSTests/stress/array-indexof-constant-folding-index-coercion.js
    M Source/JavaScriptCore/dfg/DFGFixupPhase.cpp

  Log Message:
  -----------
  Array.prototype.indexOf constant-folding should account for non-numeric index
https://bugs.webkit.org/show_bug.cgi?id=246275
<rdar://problem/101242631>

Reviewed by Yusuke Suzuki.

With this change, a Check DFG node is emitted when Array.prototype.indexOf is
constant-folded to ensure an OSR exit for non-numeric index, whose coercion
might be observable.

* JSTests/stress/array-indexof-constant-folding-index-coercion.js: Added.
* Source/JavaScriptCore/dfg/DFGFixupPhase.cpp:
(JSC::DFG::FixupPhase::fixupArrayIndexOf):

Canonical link: https://commits.webkit.org/256590@main