[Webkit-unassigned] [Bug 232479] New: [JSC] Public Class Field initialization is slow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=232479

            Bug ID: 232479
           Summary: [JSC] Public Class Field initialization is slow
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rob.palmer2 at gmail.com

Created attachment 442791

  --> https://bugs.webkit.org/attachment.cgi?id=442791&action=review

Field Initialization Benchmark

I benchmarked ES2022 class field initialization time.

  https://gist.github.com/robpalme/a9ff3e4764b764d7dc24743816d8a624#gistcomment-3944128

In Chrome and Firefox, public field initialization has been optimized to have similar performance to private fields.  Performance is also similar to assigning to `this` inside the constructor.

In latest Safari Tech Preview 134, performance of public field initialization is 12x worse than both private fields and constructor assignment.

- Classic Constructor Assignments:  38ms
- Public Fields:  462ms
- Private Fields:  33ms

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