[Webkit-unassigned] [Bug 176669] New: [JSC] Fold gigacage address into 32bit

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=176669

            Bug ID: 176669
           Summary: [JSC] Fold gigacage address into 32bit
           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

We access caged area by doing `base + (target & mask)`.
At that time, target is 64bit pointer.

This is rough idea: If we can discard alignment part we can make this target address within 32bit.
If the memory area is 8byte aligned, our 32bit offset can represent 32GB (4 * 8), which matches to the current gigacage area.
Computation becomes like, `base + (target << alignment)`.

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