Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 463c854b2ffb3329e52e2265a5d29530955ef2ba
https://github.com/WebKit/WebKit/commit/463c854b2ffb3329e52e2265a5d29530955ef2ba
Author: Vassili Bykov <[email protected]>
Date: 2025-10-20 (Mon, 20 Oct 2025)
Changed paths:
M Source/JavaScriptCore/interpreter/CallFrame.h
M Source/JavaScriptCore/llint/InPlaceInterpreter64.asm
Log Message:
-----------
Save SP in IPInt frames as a frame-relative value
https://bugs.webkit.org/show_bug.cgi?id=301117
rdar://163059656
Reviewed by Yusuke Suzuki, Daniel Liu, and Dan Hecht.
Before a function call, IPInt stores the current SP in the 'this' argument slot
of
CallFrame so that it can be recovered after a series of tail calls. In JSPI, we
need the
ability to save frame data off the stack and later reinstall and execute the
saved frames
at a different stack address. Because the saved data includes absolute values
of SP, we
need to maintain a list of such locations and relocate them after installing
the frames at
a new address.
This patch changes IPInt so SP is saved as an FP-relative value and will "just
work"
in relocated stack data.
The change is tested by the existing Wasm tests.
* Source/JavaScriptCore/interpreter/CallFrame.h:
* Source/JavaScriptCore/llint/InPlaceInterpreter64.asm:
Canonical link: https://commits.webkit.org/301855@main
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