[webkit-changes] [WebKit/WebKit] 87ae77: [JSC] Use ExtendedOffsetAddr if normal Addr with S...

[Yusuke Suzuki]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 87ae77e616dd6d6cfeb1bece78f2ac9482e132fa
      https://github.com/WebKit/WebKit/commit/87ae77e616dd6d6cfeb1bece78f2ac9482e132fa
  Author: Yusuke Suzuki <ysuzuki at apple.com>
  Date:   2022-12-19 (Mon, 19 Dec 2022)

  Changed paths:
    M Source/JavaScriptCore/b3/air/AirLowerStackArgs.cpp

  Log Message:
  -----------
  [JSC] Use ExtendedOffsetAddr if normal Addr with SP/FP failed for Patch
https://bugs.webkit.org/show_bug.cgi?id=249553
rdar://103492366

Reviewed by Justin Michaud.

Patchpoint requires that all stack arguments needs to be represented as "SP + offset" or "FP + offset".
But in AirLowerStackArgs, we are incorrectly lowering this to "LR + offset" if offset is too large.
We should use a bit suboptimal ExtendedOffsetAddr for that case to ensure that they are still "FP + offset" form.
This fixes debug assertion failure in call.wast.js, happening after 257974 at main.

* Source/JavaScriptCore/b3/air/AirLowerStackArgs.cpp:
(JSC::B3::Air::lowerStackArgs):

Canonical link: https://commits.webkit.org/258083@main