*ARM64EC:*
ARM64EC (Emulation Compatible) is a Windows ABI from Microsoft that allows
x64 and ARM64 code to run together in the same process. (Reference: Microsoft
ARM64EC documentation
<https://learn.microsoft.com/en-us/windows/arm/arm64ec>)
We are trying to build V8 (commit 50d767cfc52, Chromium 104.0.5112.102)
with ARM64EC support.
Since ARM64EC requires a newer toolchain, we upgraded Clang 15 → Clang 21
and Visual Studio → 17.14.6 / Windows SDK 26100.
To make the code compatible with the newer Clang, we applied minor fixes
based on the compilation errors reported.
These changes build and run correctly for:
- *x64* works (d8.exe hello.js runs fine)
- *ARM64* works (d8.exe hello.js runs fine)
- *ARM64EC* builds successfully, but d8.exe hello.js immediately crashes:
C:\code\chromium_git\chromium\src\out\Debug_GN_arm64ec>d8.exe hello.js
==== C stack trace ===============================
(No symbol) [0x0000024F9792CD00]
$iexit_thunk$cdecl$i8$i8i8i8i8i8i8 [0x00007FFA40A6A6B8+28]
This issue occurs only with ARM64EC builds, while x64 and ARM64 builds work
correctly under the same toolchain and with the minor code adjustments
required for newer Clang.
*Reference issue:*
- A related Chromium issue reporting an ARM64EC crash in d8.exe: Chromium
issue 440947107 <https://issues.chromium.org/issues/440947107>
Could you give me some suggestions about this issue? Thanks.
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