[Webkit-unassigned] [Bug 206174] New: Calculate new PropertyList features during parsing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206174

            Bug ID: 206174
           Summary: Calculate new PropertyList features during parsing
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: caitp at igalia.com

Minor optimization requested in https://bugs.webkit.org/attachment.cgi?id=387361&action=review#line1046

It might be worthwhile to pre-calculate the result of 'shouldCreateLexicalSCopeForClass' and 'hasInstanceFields' during parsing, or otherwise cache the value after the first calculation.

Reasons for not doing this: it makes things like AST rewriting a bit more awkward and error prone (but, AST rewriting is not as common in JSC as in v8), and the hit from walking property list to determine these features might not be significant as they are not believed to be invoked frequently.

It warrants some investigation.

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