[Webkit-unassigned] [Bug 171079] New: virtualThunkFor() needs to materialize its of tagMaskRegister for tail calls.

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Apr 20 15:05:31 PDT 2017


https://bugs.webkit.org/show_bug.cgi?id=171079

            Bug ID: 171079
           Summary: virtualThunkFor() needs to materialize its of
                    tagMaskRegister for tail calls.
           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: mark.lam at apple.com

This is because tail calls would restore callee saved registers (and therefore, potentially clobber the tag registers) before jumping to the thunk.

<rdar://problem/31684756>

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