[Webkit-unassigned] [Bug 169611] New: WebAssembly: store state in TLS instead of on VM

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169611

            Bug ID: 169611
           Summary: WebAssembly: store state in TLS instead of on VM
    Classification: Unclassified
           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: jfbastien at apple.com
                CC: fpizlo at apple.com, jfbastien at apple.com,
                    keith_miller at apple.com, mark.lam at apple.com,
                    msaboff at apple.com, sbarati at apple.com
        Depends on: 169483
            Blocks: 168264

As part of bug #168264 to make WebAssembly position independent, we should migrate all state currently stored on VM to TLS instead. We have 4 slots to use so it could be a speedup to do this.

I'll start off simply moving the state, and afterwards we should be able to experiment with which fields should pointer-chase through TLS->instance->field, which should be in a TLS slot, and which should be in pinned registers.

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