[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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