[webkit-changes] [WebKit/WebKit] 16709e: Fix exception Fuzz in Baseline/DFG with exception ...

[Keith Miller]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 16709ef06aca82c4f2ab72e63cce4d2981e2cf59
      https://github.com/WebKit/WebKit/commit/16709ef06aca82c4f2ab72e63cce4d2981e2cf59
  Author: Keith Miller <keith_miller at apple.com>
  Date:   2024-05-18 (Sat, 18 May 2024)

  Changed paths:
    M Source/JavaScriptCore/jit/AssemblyHelpers.cpp
    M Source/JavaScriptCore/jit/AssemblyHelpers.h

  Log Message:
  -----------
  Fix exception Fuzz in Baseline/DFG with exception return registers
https://bugs.webkit.org/show_bug.cgi?id=274315
rdar://128230658

Reviewed by Mark Lam.

Baseline/DFG `emitExceptionCheck` didn't forward the exception register
it's going to use to `callExceptionFuzz` so it could get out of sync
with the fuzzers state. Now `callExceptionFuzz` will properly fill the
exception register with the new exception if it's set.

* Source/JavaScriptCore/jit/AssemblyHelpers.cpp:
(JSC::AssemblyHelpers::callExceptionFuzz):
(JSC::AssemblyHelpers::emitExceptionCheck):
* Source/JavaScriptCore/jit/AssemblyHelpers.h:

Canonical link: https://commits.webkit.org/278956@main



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