[webkit-changes] [WebKit/WebKit] 959410: [JSC] Fix speculation for JSMap/SetIterator in DFG...

[Yijia Huang]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 959410e0ccfa1db00275b4c1f9412dc45f3ac033
      https://github.com/WebKit/WebKit/commit/959410e0ccfa1db00275b4c1f9412dc45f3ac033
  Author: Yijia Huang <yijia_huang at apple.com>
  Date:   2024-08-03 (Sat, 03 Aug 2024)

  Changed paths:
    M Source/JavaScriptCore/bytecode/SpeculatedType.cpp
    M Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp

  Log Message:
  -----------
  [JSC] Fix speculation for JSMap/SetIterator in DFG and FTL
https://bugs.webkit.org/show_bug.cgi?id=277576
rdar://133097257

Reviewed by Alexey Shvayka and Yusuke Suzuki.

The speculation of speculateMap(Set)IteratorObject is
definitely wrong. This patch fix all speculations for
JSMap/SetIterator in DFG and FTL.

* Source/JavaScriptCore/bytecode/SpeculatedType.cpp:
(JSC::speculationFromJSType):
* Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp:
(JSC::FTL::DFG::LowerDFGToB3::compileCompareStrictEq):

Canonical link: https://commits.webkit.org/281810@main



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