Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 7a71bbb85003c03c9da7c85fa194069bc8992095
https://github.com/WebKit/WebKit/commit/7a71bbb85003c03c9da7c85fa194069bc8992095
Author: Sergey Rubanov <[email protected]>
Date: 2026-07-21 (Tue, 21 Jul 2026)
Changed paths:
A JSTests/wasm/stress/data-segment-offset-2gb.js
M Source/JavaScriptCore/wasm/js/WebAssemblyModuleRecord.cpp
Log Message:
-----------
[JSC][Wasm] Zero-extend memory32 data segment offsets
https://bugs.webkit.org/show_bug.cgi?id=314444
Reviewed by Yusuke Suzuki.
i32.const data offsets are stored in a uint64_t with C++ sign-extension, so
0x80000000 (e.g. Emscripten GLOBAL_BASE=2GB) became 0xffffffff80000000 and
failed active data segment initialization. Treat memory32 offsets as u32
(zero-extend from the i32 bit pattern). Memory64 keeps full i64 offsets and
uses i64 globals / const expressions.
* Source/JavaScriptCore/wasm/js/WebAssemblyModuleRecord.cpp:
* JSTests/wasm/stress/data-segment-offset-2gb.js: Added.
Canonical link: https://commits.webkit.org/317633@main
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