gh-132399: fix invalid function signatures on the free-threaded build (#132400)

Author: picnixz

Objects/codeobject.c

@@ -2996,8 +2996,9 @@ is_bytecode_unused(_PyCodeArray *tlbc, Py_ssize_t idx,
 }
 
 static int
-get_code_with_unused_tlbc(PyObject *obj, struct get_code_args *args)
+get_code_with_unused_tlbc(PyObject *obj, void *data)
 {
+    struct get_code_args *args = (struct get_code_args *) data;
     if (!PyCode_Check(obj)) {
         return 1;
     }
@@ -3046,7 +3047,7 @@ _Py_ClearUnusedTLBC(PyInterpreterState *interp)
     }
     // Collect code objects that have bytecode not in use by any thread
     _PyGC_VisitObjectsWorldStopped(
-        interp, (gcvisitobjects_t)get_code_with_unused_tlbc, &args);
+        interp, get_code_with_unused_tlbc, &args);
     if (args.err < 0) {
         goto err;
     }

Python/gc_free_threading.c

@@ -688,6 +688,12 @@ gc_mark_enqueue_no_buffer(PyObject *op, gc_mark_args_t *args)
     return 0;
 }
 
+static inline int
+gc_mark_enqueue_no_buffer_visitproc(PyObject *op, void *args)
+{
+    return gc_mark_enqueue_no_buffer(op, (gc_mark_args_t *)args);
+}
+
 static int
 gc_mark_enqueue_buffer(PyObject *op, gc_mark_args_t *args)
 {
@@ -701,6 +707,12 @@ gc_mark_enqueue_buffer(PyObject *op, gc_mark_args_t *args)
     }
 }
 
+static inline int
+gc_mark_enqueue_buffer_visitproc(PyObject *op, void *args)
+{
+    return gc_mark_enqueue_buffer(op, (gc_mark_args_t *)args);
+}
+
 // Called when we find an object that needs to be marked alive (either from a
 // root or from calling tp_traverse).
 static int
@@ -986,12 +998,12 @@ update_refs(const mi_heap_t *heap, const mi_heap_area_t *area,
 }
 
 static int
-visit_clear_unreachable(PyObject *op, _PyObjectStack *stack)
+visit_clear_unreachable(PyObject *op, void *stack)
 {
     if (gc_is_unreachable(op)) {
         _PyObject_ASSERT(op, _PyObject_GC_IS_TRACKED(op));
         gc_clear_unreachable(op);
-        return _PyObjectStack_Push(stack, op);
+        return _PyObjectStack_Push((_PyObjectStack *)stack, op);
     }
     return 0;
 }
@@ -1003,7 +1015,7 @@ mark_reachable(PyObject *op)
     _PyObjectStack stack = { NULL };
     do {
         traverseproc traverse = Py_TYPE(op)->tp_traverse;
-        if (traverse(op, (visitproc)&visit_clear_unreachable, &stack) < 0) {
+        if (traverse(op, visit_clear_unreachable, &stack) < 0) {
             _PyObjectStack_Clear(&stack);
             return -1;
         }
@@ -1273,7 +1285,7 @@ gc_propagate_alive_prefetch(gc_mark_args_t *args)
                 return -1;
             }
         }
-        else if (traverse(op, (visitproc)&gc_mark_enqueue_buffer, args) < 0) {
+        else if (traverse(op, gc_mark_enqueue_buffer_visitproc, args) < 0) {
             return -1;
         }
     }
@@ -1294,7 +1306,7 @@ gc_propagate_alive(gc_mark_args_t *args)
             assert(_PyObject_GC_IS_TRACKED(op));
             assert(gc_is_alive(op));
             traverseproc traverse = Py_TYPE(op)->tp_traverse;
-            if (traverse(op, (visitproc)&gc_mark_enqueue_no_buffer, args) < 0) {
+            if (traverse(op, gc_mark_enqueue_no_buffer_visitproc, args) < 0) {
                 return -1;
             }
         }
@@ -1751,9 +1763,7 @@ handle_resurrected_objects(struct collection_state *state)
         op->ob_ref_local -= 1;
 
         traverseproc traverse = Py_TYPE(op)->tp_traverse;
-        (void) traverse(op,
-            (visitproc)visit_decref_unreachable,
-            NULL);
+        (void)traverse(op, visit_decref_unreachable, NULL);
     }
 
     // Find resurrected objects