[Webkit-unassigned] [Bug 142651] New: Introduce SymbolType into SpeculativeTypes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=142651

            Bug ID: 142651
           Summary: Introduce SymbolType into SpeculativeTypes
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: utatane.tea at gmail.com

Currently, Symbol is classified as SpecCellOther.
But this is too conservative analysis and there's room to optimize it.

Introducing SpecSymbol and analyzing this type in DFG/FTL brings faster Symbol comparison and lookups with it.
It will encourage some applications that uses Symbol as an unique key, like React.js.

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