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fix: crash in UiMessageCapture on ARM64 macOS #20

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Merged
0xeb merged 1 commit into from
Mar 6, 2026
+8 −6
Merged

fix: crash in UiMessageCapture on ARM64 macOS #20

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14 changes: 8 additions & 6 deletions src/lib/src/idapython_exec.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -84,15 +84,17 @@ ssize_t idaapi UiMessageCapture::on_event(ssize_t code, va_list va) {
return 0;
}

// On GCC/Clang, va_list is an array type that decays to a pointer when
// passed through variadic args. On MSVC, va_list is char* (passed by value).
// va_list is an array type on x86-64 System V ABI (__va_list_tag[1]),
// so it decays to a pointer when passed through variadic args.
// On MSVC and ARM64 Apple (where va_list is char*), it is a scalar
// type passed by value — no decay, no extra indirection.
va_list copy;
#ifdef _MSC_VER
va_list format_args = va_arg(va, va_list);
va_copy(copy, format_args);
#else
#if defined(__x86_64__) && !defined(_MSC_VER)
va_list* format_args = va_arg(va, va_list*);
va_copy(copy, *format_args);
#else
va_list format_args = va_arg(va, va_list);
va_copy(copy, format_args);
#endif
qstring formatted;
formatted.vsprnt(format, copy);
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