[Webkit-unassigned] [Bug 183435] New: [JSC] Optimize inherits<T> if T is final type

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=183435

            Bug ID: 183435
           Summary: [JSC] Optimize inherits<T> if T is final type
           Product: WebKit
           Version: WebKit 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

If T is a final type, we do not need to traverse hierarchy.

Consider a final type T,

jsDynamicCast<T*>(vm, cell);

in this case,

if (cell->classInfo(vm) == T::info())
    return static_cast<T*>(cell);
return nullptr;

is enough. We can this optimization in JSCast.h with std::is_final<T>.

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