[Webkit-unassigned] [Bug 170440] New: Slightly change the JSC exception handling calling convention to remove the terrible hack that wasm uses to stick a Cell into the call frame

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Apr 3 21:46:34 PDT 2017


https://bugs.webkit.org/show_bug.cgi?id=170440

            Bug ID: 170440
           Summary: Slightly change the JSC exception handling calling
                    convention to remove the terrible hack that wasm uses
                    to stick a Cell into the call frame
           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: sbarati at apple.com
                CC: benjamin at webkit.org, fpizlo at apple.com,
                    ggaren at apple.com, gskachkov at gmail.com,
                    jfbastien at apple.com, keith_miller at apple.com,
                    mark.lam at apple.com, msaboff at apple.com,
                    ticaiolima at gmail.com, utatane.tea at gmail.com

Wasm will put a JSCell into the callee just so the code that catches an exception can get the VM from the callee. However, this is a hack. Instead, we could just make the thing that jumps to exception handling code location load vm.callFrameForCatch into the call frame register before jumping to the exception handling code.

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