[webkit-changes] [WebKit/WebKit] 681406: [JSC] Emit store-store-fence before setting JITData

[Yusuke Suzuki]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 681406fe4a5e7f618f1625e3b02537955d2a989b
      https://github.com/WebKit/WebKit/commit/681406fe4a5e7f618f1625e3b02537955d2a989b
  Author: Yusuke Suzuki <ysuzuki at apple.com>
  Date:   2022-11-18 (Fri, 18 Nov 2022)

  Changed paths:
    M Source/JavaScriptCore/bytecode/CodeBlock.cpp
    M Source/JavaScriptCore/bytecode/CodeBlock.h

  Log Message:
  -----------
  [JSC] Emit store-store-fence before setting JITData
https://bugs.webkit.org/show_bug.cgi?id=248117
rdar://102538400

Reviewed by Mark Lam.

We scan data of JITData from concurrent GC thread. Thus, when setting it to CodeBlock,
its memory needs to be fully initialized.

* Source/JavaScriptCore/bytecode/CodeBlock.cpp:
(JSC::CodeBlock::setupWithUnlinkedBaselineCode):
* Source/JavaScriptCore/bytecode/CodeBlock.h:
(JSC::CodeBlock::setBaselineJITData):
(JSC::CodeBlock::setDFGJITData):

Canonical link: https://commits.webkit.org/256871@main