[Webkit-unassigned] [Bug 227170] New: Prevent sign-extended casts for 32 bits arch

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227170

            Bug ID: 227170
           Summary: Prevent sign-extended casts for 32 bits arch
           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: mikhail at igalia.com

In a number of places, addresses are reinterpreted as uint64, which can lead to wrong addresses in 32 bits arch. 

For example, in https://bugs.webkit.org/show_bug.cgi?id=226503, asCell() returns a pointer to the payload and using reinterpret_cast will sign extend asNumber to FFFF FFFF + , which will fail the isImpureNaN check in jsNumber.

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