[Webkit-unassigned] [Bug 168264] New: WebAssembly: make code position independent

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Feb 13 16:14:09 PST 2017


            Bug ID: 168264
           Summary: WebAssembly: make code position independent
    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
            Blocks: 166480, 166481

We'll want to be able to save a WebAssembly.Module's code in IndexDB (#166481) and postMessage (#166480) the WebAssembly.Module cheaply to other workers without having to patch pointers and duplicate physical pages used for code. This allows us to instantiate the same module waaayyy better.

Right now our implementation has some pointers baked in: &VM.topInstance, and functions for back traces. We'll want to do away with this.

The easiest and fastest thing is probably to store the topInstance in a TLS slot, and then change it when entering js->wasm, doing wasm->wasm calls, and when in a worker (nothing to do here really, it's the same mechanism).

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