[Webkit-unassigned] [Bug 126721] New: JavaScriptCore Obj-C API gives incorrect behavior for CGFloat properties on ARM64

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=126721

           Summary: JavaScriptCore Obj-C API gives incorrect behavior for
                    CGFloat properties on ARM64
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: https://github.com/iamdavidhart/JSObjCBridge64BitTest
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mrowe at apple.com
                CC: webkit-bug-importer at group.apple.com


>From <https://github.com/iamdavidhart/JSObjCBridge64BitTest>:

> The new Javascript-ObjC bridge on iOS7 is broken on 64bit iOS ARM devices when using an exported property declared as a CGFloat from javascript. When accessing the CGFloat property of a bridged ObjC object, the value set or get is wrong, always a (very nearly) zero value.

The linked GitHub repository contains a test case that claims to give correct results in 32-bit while demonstrating the bug in 64-bit.

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