Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 9aa33190dfc1d30ec09060b3d12ec2b5337e86f4
https://github.com/WebKit/WebKit/commit/9aa33190dfc1d30ec09060b3d12ec2b5337e86f4
Author: Shu-yu Guo <[email protected]>
Date: 2025-08-27 (Wed, 27 Aug 2025)
Changed paths:
M Source/JavaScriptCore/wasm/WasmOperations.cpp
Log Message:
-----------
[JSC] Always initialize result array in wasm return frame
https://bugs.webkit.org/show_bug.cgi?id=297812
rdar://158847247
Reviewed by Keith Miller.
Allocating uninitialized JSArrays is faster but unsafe. For use in Wasm
multi-value returns, initializing the return array can call into user code and
throws, making use of uninitialized JSArrays error-prone as all exception
return paths have to take care to ensure that array gets fully initialized.
This PR changes the Wasm multi-value return use case to use initialized arrays.
This change is performance neutral on JetStream and Speedometer.
Canonical link: https://commits.webkit.org/299210@main
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