Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 8268f5fdf8ebf9331602943fe32281afd03984ff
https://github.com/WebKit/WebKit/commit/8268f5fdf8ebf9331602943fe32281afd03984ff
Author: Vassili Bykov <[email protected]>
Date: 2025-10-02 (Thu, 02 Oct 2025)
Changed paths:
M Source/JavaScriptCore/interpreter/VMEntryRecord.h
M Source/JavaScriptCore/runtime/VM.h
Log Message:
-----------
Assert the assumption that two VM fields are loadable as a pair
https://bugs.webkit.org/show_bug.cgi?id=299933
rdar://161707462
Reviewed by Mark Lam and Justin Michaud.
Fields `VM::topCallFrame` and `VM::topEntryFrame` are loaded and stored as a
pair by the
assembly code. This PR adds a static assert to verify that the fields are laid
out
accordingly, and a comment to point out that some loads and stores of
`VM::topEntryFrame`
are implicit in pair instructions operating on `VM::topCallFrame`. A similar
comment is
added to `VMEntryRecord`, which already has a static assert for its pair of
fields used
with pair instructions.
The patch does not touch executable code and is not directly testable.
Canonical link: https://commits.webkit.org/300898@main
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