[Webkit-unassigned] [Bug 212825] New: Make FAST_JIT_PERMISSIONS check in LinkBuffer::copyCompactAndLinkCode a runtime check

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=212825

            Bug ID: 212825
           Summary: Make FAST_JIT_PERMISSIONS check in
                    LinkBuffer::copyCompactAndLinkCode a runtime check
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: msaboff at apple.com

There are some ARM64 devices that have runtime support for APRR, but the current way we link in copyCompactAndLinkCode() causes us to use a side buffer to link the code before copying the results to the JIT memory.  By making the FAST_JIT_PERMISSION paths runtime selected, we can eliminate the allocation of the buffer and the subsequent copying out of the buffer.

This is a follow to https://bugs.webkit.org/show_bug.cgi?id=212765.

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