[Webkit-unassigned] [Bug 139327] New: CFA wrongly assumes that a speculation for SlowPutArrayStorageShape disallows ArrayStorageShape arrays

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=139327

            Bug ID: 139327
           Summary: CFA wrongly assumes that a speculation for
                    SlowPutArrayStorageShape disallows ArrayStorageShape
                    arrays
    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: mark.lam at apple.com

The code generator speculation checks for SlowPutArrayStorageShape explicitly allows ArrayStorageShape arrays.  The runtime slow paths that handles SlowPutArrayStorageShape is also capable of handling ArrayStorageShape arrays.  As a result, the CFA may declare some basic blocks as unreachable though the code generator expects otherwise.

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