New submission from Eli Rykoff <[email protected]>:
Building python 3.9.1 on Apple Silicon compiled against a external
(non-os-provided) libffi makes the following code return a MemoryError:
Test:
import ctypes
@ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)
def error_handler(fif, message):
pass
I have tracked this down to the following code in malloc_closure.c:
#if USING_APPLE_OS_LIBFFI && HAVE_FFI_CLOSURE_ALLOC
if (__builtin_available(macos 10.15, ios 13, watchos 6, tvos 13, *)) {
ffi_closure_free(p);
return;
}
#endif
and
#if USING_APPLE_OS_LIBFFI && HAVE_FFI_CLOSURE_ALLOC
if (__builtin_available(macos 10.15, ios 13, watchos 6, tvos 13, *)) {
return ffi_closure_alloc(size, codeloc);
}
#endif
In fact, while the __builtin_available() call should be guarded by
USING_APPLE_OS_LIBFFI, the call to ffi_closure_alloc() should only be guarded
by HAVE_FFI_CLOSURE_ALLOC, as this is set as the result of an independent check
in setup.py and should be used with external libffi when supported.
The following code does work instead:
#if HAVE_FFI_CLOSURE_ALLOC
#if USING_APPLE_OS_LIBFFI
if (__builtin_available(macos 10.15, ios 13, watchos 6, tvos 13, *)) {
#endif
ffi_closure_free(p);
return;
#if USING_APPLE_OS_LIBFFI
}
#endif
#endif
#if HAVE_FFI_CLOSURE_ALLOC
#if USING_APPLE_OS_LIBFFI
if (__builtin_available(macos 10.15, ios 13, watchos 6, tvos 13, *)) {
#endif
return ffi_closure_alloc(size, codeloc);
return;
#if USING_APPLE_OS_LIBFFI
}
#endif
#endif
----------
components: ctypes
messages: 383419
nosy: erykoff
priority: normal
severity: normal
status: open
title: ctypes memory error on Apple Silicon with external libffi
type: behavior
versions: Python 3.9
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Python tracker <[email protected]>
<https://bugs.python.org/issue42688>
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