Added TO_STATE() marker to work around cpychecker refcount issue

See davidmalcolm/gcc-python-plugin#109

Author: dvarrazzo

psycopg/connection_int.c

@@ -1392,7 +1392,7 @@ conn_tpc_begin(connectionObject *self, xidObject *xid)
 
     /* The transaction started ok, let's store this xid. */
     Py_INCREF(xid);
-    self->tpc_xid = xid;
+    self->tpc_xid = (xidObject *)TO_STATE((PyObject *)xid);
 
     return 0;
 }

psycopg/connection_type.c

@@ -1337,13 +1337,13 @@ connection_setup(connectionObject *self, const char *dsn, long int async)
       );
 
     if (0 > psycopg_strdup(&self->dsn, dsn, -1)) { goto exit; }
-    if (!(self->notice_list = PyList_New(0))) { goto exit; }
-    if (!(self->notifies = PyList_New(0))) { goto exit; }
+    if (!(self->notice_list = TO_STATE(PyList_New(0)))) { goto exit; }
+    if (!(self->notifies = TO_STATE(PyList_New(0)))) { goto exit; }
     self->async = async;
     self->status = CONN_STATUS_SETUP;
     self->async_status = ASYNC_DONE;
-    if (!(self->string_types = PyDict_New())) { goto exit; }
-    if (!(self->binary_types = PyDict_New())) { goto exit; }
+    if (!(self->string_types = TO_STATE(PyDict_New()))) { goto exit; }
+    if (!(self->binary_types = TO_STATE(PyDict_New()))) { goto exit; }
     self->isolevel = ISOLATION_LEVEL_DEFAULT;
     self->readonly = STATE_DEFAULT;
     self->deferrable = STATE_DEFAULT;

psycopg/utils.c

@@ -465,3 +465,19 @@ psyco_GetDecimalType(void)
 
     return decimalType;
 }
+
+
+/* Transfer ownership of an object to another object's state.
+ *
+ * Work around what seems a bug to the cpychecker which doesn't recognise
+ * the new reference: tell it one reference is just gone.
+ *
+ * See davidmalcolm/gcc-python-plugin#109
+ */
+#ifdef WITH_CPYCHECKER_RETURNS_BORROWED_REF_ATTRIBUTE
+STEALS(1) IGNORE_REFCOUNT BORROWED PyObject *
+TO_STATE(PyObject* obj)
+{
+    return obj;
+}
+#endif

psycopg/utils.h

@@ -58,4 +58,10 @@ HIDDEN RAISES BORROWED PyObject *psyco_set_error(
 
 HIDDEN PyObject *psyco_GetDecimalType(void);
 
+#ifdef WITH_CPYCHECKER_RETURNS_BORROWED_REF_ATTRIBUTE
+HIDDEN STEALS(1) IGNORE_REFCOUNT BORROWED PyObject *TO_STATE(PyObject* obj);
+#else
+#define TO_STATE(x) x
+#endif
+
 #endif /* !defined(UTILS_H) */