Importing rubicon.objs hangs on pypy

[almarklein]

Describe the bug

When I try to import rubicon.objc using Pypy, the process hangs while it allocates more and more memory. I traced this down to this line, and it seems to be related to the PyDictObject:

rubicon-objc/src/rubicon/objc/ctypes_patch.py

Lines 121 to 132 in 6c3d6b6

	class StgDictObject(ctypes.Structure):
	_fields_ = [
	("dict", PyDictObject),
	("size", ctypes.c_ssize_t),
	("align", ctypes.c_ssize_t),
	("length", ctypes.c_ssize_t),
	("ffi_type_pointer", ffi_type),
	("proto", ctypes.py_object),
	("setfunc", SETFUNC),
	("getfunc", GETFUNC),
	# There are a few more fields, but we leave them out again because we don't need them.
	]

With "traced it down" I mean that I put 1/0 in the code to make it raise an exception. If the it hung instead of raising the exception, then the hangup occurred bedore it. The code above is where it hangs. And if I comment the field with the PyDictObject, then it does not hang, so it looks like it's related to that.

I tried with pypy3.8-7.3.11 and pypy3.9-7.3.11, both installed via pyenv.

Steps to reproduce

Run import ubicon.objc in a pypy interpreter. The process hangs, does not respond to ctrl-c.

Expected behavior

I would expect the import to work :)

Screenshots

No response

Environment

MacOS M1 pro Sonoma 14.3

Logs

Additional context

No response

[freakboy3742]

Thanks for the report; we don't include PyPy in our testing, and I can't claim any particular expertise with PyPy, so I can't comment on what is going on here. If anyone is able to provide a patch, I'm happy to apply it.