"Implicit conversion changes signedness" warning from unicodeobject.h #580

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1. msimacek commented on Dec 22, 2025

   

   msimacek

   on Dec 22, 2025

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   PyAPI_FUNC(int) PyUnicode_KIND(PyObject *op);

   This is the limited API definition. The normal one in CPython is:
   #define PyUnicode_KIND(op) _Py_RVALUE(_PyASCIIObject_CAST(op)->state.kind)
   The kind field is declared as an unsigned in a bitfield: unsigned int kind:3;

   Our definition is: #define PyUnicode_KIND(op) ((enum PyUnicode_Kind)GraalPyUnicode_KIND(_PyObject_CAST(op)))

   If we make it an int, it could cause warnings when you use PyUnicode_Kind or unsigned int as the variable type. I guess we could make it unsigned char which can be losslessly extended to both int and unsigned int. I'll need to experiment with it.
2. timfel

   added

   good first issueGood for newcomersGood for newcomers

   on Apr 10, 2026