[webkit-changes] [WebKit/WebKit] 2bb6d0: Elide manual auth validation check when FPAC is su...

[EWS]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 2bb6d041654cd8ae1999ca31b372dd9e1d5330f3
      https://github.com/WebKit/WebKit/commit/2bb6d041654cd8ae1999ca31b372dd9e1d5330f3
  Author: Mark Lam <mark.lam at apple.com>
  Date:   2023-01-27 (Fri, 27 Jan 2023)

  Changed paths:
    M Source/JavaScriptCore/assembler/CPU.cpp
    M Source/JavaScriptCore/assembler/CPU.h
    M Source/JavaScriptCore/assembler/MacroAssemblerARM64E.h
    M Source/JavaScriptCore/runtime/InitializeThreading.cpp
    M Source/JavaScriptCore/runtime/JSCConfig.h

  Log Message:
  -----------
  Elide manual auth validation check when FPAC is supported.
https://bugs.webkit.org/show_bug.cgi?id=251244
<rdar://problem/104725544>

Reviewed by Yusuke Suzuki.

With FPAC, the aut instruction will validate its own result.  Hence, the
manual validation that we used to do after the aut is now redundant.

* Source/JavaScriptCore/assembler/CPU.cpp:
(JSC::isARM64E_FPAC):
* Source/JavaScriptCore/assembler/CPU.h:
(JSC::isARM64E_FPAC):
(JSC::isARM64_LSE):
* Source/JavaScriptCore/assembler/MacroAssemblerARM64E.h:
(JSC::MacroAssemblerARM64E::validateUntaggedPtr):
(JSC::MacroAssemblerARM64E::untagArrayPtr):
(JSC::MacroAssemblerARM64E::untagArrayPtrLength64):
* Source/JavaScriptCore/runtime/InitializeThreading.cpp:
(JSC::initialize):
* Source/JavaScriptCore/runtime/JSCConfig.h:

Canonical link: https://commits.webkit.org/259491@main