gh-000000: Convert PyBool_Check, PyBytes_Check & PyBytes_CheckExact macro to a function

Include/boolobject.h

@@ -9,7 +9,14 @@ extern "C" {
 
 // PyBool_Type is declared by object.h
 
-#define PyBool_Check(x) Py_IS_TYPE((x), &PyBool_Type)
+#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= _Py_PACK_VERSION(3, 16)
+PyAPI_FUNC(int) PyBool_Check(PyObject *x);
+#endif
+#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < _Py_PACK_VERSION(3, 16)
+#  define PyBool_Check(x) Py_IS_TYPE((x), &PyBool_Type)
+#else
+#  define PyBool_Check(x) PyBool_Check(_PyObject_CAST(x))
+#endif
 
 /* Py_False and Py_True are the only two bools in existence. */
 

Include/bytesobject.h

@@ -24,9 +24,18 @@ functions should be applied to NULL pointer.
 PyAPI_DATA(PyTypeObject) PyBytes_Type;
 PyAPI_DATA(PyTypeObject) PyBytesIter_Type;
 
-#define PyBytes_Check(op) \
+#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= _Py_PACK_VERSION(3, 16)
+PyAPI_FUNC(int) PyBytes_Check(PyObject *op);
+PyAPI_FUNC(int) PyBytes_CheckExact(PyObject *op);
+#endif
+#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < _Py_PACK_VERSION(3, 16)
+#  define PyBytes_Check(op) \
                  PyType_FastSubclass(Py_TYPE(op), Py_TPFLAGS_BYTES_SUBCLASS)
-#define PyBytes_CheckExact(op) Py_IS_TYPE((op), &PyBytes_Type)
+#  define PyBytes_CheckExact(op) Py_IS_TYPE((op), &PyBytes_Type)
+#else
+#  define PyBytes_Check(op) PyBytes_Check(_PyObject_CAST(op))
+#  define PyBytes_CheckExact(op) PyBytes_CheckExact(_PyObject_CAST(op))
+#endif
 
 PyAPI_FUNC(PyObject *) PyBytes_FromStringAndSize(const char *, Py_ssize_t);
 PyAPI_FUNC(PyObject *) PyBytes_FromString(const char *);

Misc/NEWS.d/next/C_API/2026-05-08-16-36-36.gh-issue-000000.2F1XTY.rst

@@ -0,0 +1,5 @@
+In the Limited C API 3.16 and newer, :c:func:`PyBool_Check` is now available
+as a function instead of a macro.
+
+In the Limited C API 3.16 and newer, :c:func:`PyBytes_Check` and
+:c:func:`PyBytes_CheckExact` are now available as functions instead of macros.

Misc/stable_abi.toml

@@ -2831,3 +2831,12 @@
 
 [function.PyObject_CallFinalizerFromDealloc]
     added = '3.15'
+
+[function.PyBool_Check]
+    added = '3.16'
+
+[function.PyBytes_Check]
+    added = '3.16'
+
+[function.PyBytes_CheckExact]
+    added = '3.16'

Objects/boolobject.c

@@ -225,3 +225,8 @@ struct _longobject _Py_TrueStruct = {
         { 1 }
     }
 };
+
+// Implementations for the Stable ABI
+
+#undef PyBool_Check
+int PyBool_Check(PyObject *x) { return Py_IS_TYPE(x, &PyBool_Type); }

Objects/bytesobject.c

@@ -3915,3 +3915,12 @@ PyBytesWriter_Format(PyBytesWriter *writer, const char *format, ...)
     Py_ssize_t size = buf - byteswriter_data(writer);
     return PyBytesWriter_Resize(writer, size);
 }
+
+
+// Implementations for the Stable ABI
+
+#undef PyBytes_Check
+int PyBytes_Check(PyObject *op) { return PyType_FastSubclass(Py_TYPE(op), Py_TPFLAGS_BYTES_SUBCLASS); }
+
+#undef PyBytes_CheckExact
+int PyBytes_CheckExact(PyObject *op) { return Py_IS_TYPE(op, &PyBytes_Type); }