Use Py_CLEAR() in a few more places, and do INCREF's before setting

struct members rather than afterwards.

psycopg/adapter_asis.c

@@ -96,8 +96,8 @@ asis_setup(asisObject *self, PyObject *obj)
         self, ((PyObject *)self)->ob_refcnt
       );
 
+    Py_INCREF(obj);
     self->wrapped = obj;
-    Py_INCREF(self->wrapped);
 
     Dprintf("asis_setup: good asis object at %p, refcnt = "
         FORMAT_CODE_PY_SSIZE_T,
@@ -118,7 +118,7 @@ asis_dealloc(PyObject* obj)
 {
     asisObject *self = (asisObject *)obj;
 
-    Py_XDECREF(self->wrapped);
+    Py_CLEAR(self->wrapped);
 
     Dprintf("asis_dealloc: deleted asis object at %p, refcnt = "
         FORMAT_CODE_PY_SSIZE_T,

psycopg/adapter_binary.c

@@ -257,8 +257,8 @@ binary_setup(binaryObject *self, PyObject *str)
 
     self->buffer = NULL;
     self->conn = NULL;
+    Py_INCREF(str);
     self->wrapped = str;
-    Py_INCREF(self->wrapped);
 
     Dprintf("binary_setup: good binary object at %p, refcnt = "
         FORMAT_CODE_PY_SSIZE_T,
@@ -282,9 +282,9 @@ binary_dealloc(PyObject* obj)
 {
     binaryObject *self = (binaryObject *)obj;
 
-    Py_XDECREF(self->wrapped);
+    Py_CLEAR(self->wrapped);
-    Py_XDECREF(self->buffer);
+    Py_CLEAR(self->buffer);
-    Py_XDECREF(self->conn);
+    Py_CLEAR(self->conn);
 
     Dprintf("binary_dealloc: deleted binary object at %p, refcnt = "
         FORMAT_CODE_PY_SSIZE_T,

psycopg/adapter_datetime.c

@@ -131,8 +131,8 @@ pydatetime_setup(pydatetimeObject *self, PyObject *obj, int type)
         self, ((PyObject *)self)->ob_refcnt);
 
     self->type = type;
+    Py_INCREF(obj);
     self->wrapped = obj;
-    Py_INCREF(self->wrapped);
 
     Dprintf("pydatetime_setup: good pydatetime object at %p, refcnt = "
         FORMAT_CODE_PY_SSIZE_T,
@@ -154,7 +154,7 @@ pydatetime_dealloc(PyObject* obj)
 {
     pydatetimeObject *self = (pydatetimeObject *)obj;
 
-    Py_XDECREF(self->wrapped);
+    Py_CLEAR(self->wrapped);
 
     Dprintf("mpydatetime_dealloc: deleted pydatetime object at %p, "
             "refcnt = " FORMAT_CODE_PY_SSIZE_T, obj, obj->ob_refcnt);

psycopg/adapter_list.c

@@ -108,9 +108,9 @@ list_prepare(listObject *self, PyObject *args)
        reference to it; we'll need it during the recursive adapt() call (the
        encoding is here for a future expansion that will make .getquoted()
        work even without a connection to the backend. */
-    Py_XDECREF(self->connection);
+    Py_CLEAR(self->connection);
+    Py_INCREF(conn);
     self->connection = (PyObject*)conn;
-    Py_INCREF(self->connection);
 
     Py_INCREF(Py_None);
     return Py_None;
@@ -169,8 +169,8 @@ list_setup(listObject *self, PyObject *obj, const char *enc)
     if (enc) self->encoding = strdup(enc);
 
     self->connection = NULL;
+    Py_INCREF(obj);
     self->wrapped = obj;
-    Py_INCREF(self->wrapped);
 
     Dprintf("list_setup: good list object at %p, refcnt = "
         FORMAT_CODE_PY_SSIZE_T,
@@ -194,8 +194,8 @@ list_dealloc(PyObject* obj)
 {
     listObject *self = (listObject *)obj;
 
-    Py_XDECREF(self->wrapped);
+    Py_CLEAR(self->wrapped);
-    Py_XDECREF(self->connection);
+    Py_CLEAR(self->connection);
     if (self->encoding) free(self->encoding);
 
     Dprintf("list_dealloc: deleted list object at %p, "

psycopg/adapter_mxdatetime.c

@@ -152,8 +152,8 @@ mxdatetime_setup(mxdatetimeObject *self, PyObject *obj, int type)
       );
 
     self->type = type;
+    Py_INCREF(obj);
     self->wrapped = obj;
-    Py_INCREF(self->wrapped);
 
     Dprintf("mxdatetime_setup: good mxdatetime object at %p, refcnt = "
         FORMAT_CODE_PY_SSIZE_T,
@@ -176,7 +176,7 @@ mxdatetime_dealloc(PyObject* obj)
 {
     mxdatetimeObject *self = (mxdatetimeObject *)obj;
 
-    Py_XDECREF(self->wrapped);
+    Py_CLEAR(self->wrapped);
 
     Dprintf("mxdatetime_dealloc: deleted mxdatetime object at %p, refcnt = "
         FORMAT_CODE_PY_SSIZE_T,

psycopg/adapter_pboolean.c

@@ -106,8 +106,8 @@ pboolean_setup(pbooleanObject *self, PyObject *obj)
         self, ((PyObject *)self)->ob_refcnt
       );
 
+    Py_INCREF(obj);
     self->wrapped = obj;
-    Py_INCREF(self->wrapped);
 
     Dprintf("pboolean_setup: good pboolean object at %p, refcnt = "
         FORMAT_CODE_PY_SSIZE_T,
@@ -130,7 +130,7 @@ pboolean_dealloc(PyObject* obj)
 {
     pbooleanObject *self = (pbooleanObject *)obj;
 
-    Py_XDECREF(self->wrapped);
+    Py_CLEAR(self->wrapped);
 
     Dprintf("pboolean_dealloc: deleted pboolean object at %p, refcnt = "
         FORMAT_CODE_PY_SSIZE_T,

psycopg/adapter_qstring.c

@@ -216,10 +216,10 @@ qstring_prepare(qstringObject *self, PyObject *args)
         Dprintf("qstring_prepare: set encoding to %s", conn->encoding);
     }
 
-    Py_XDECREF(self->conn);
+    Py_CLEAR(self->conn);
     if (conn) {
+        Py_INCREF(conn);
         self->conn = (PyObject*)conn;
-        Py_INCREF(self->conn);
     }
 
     Py_INCREF(Py_None);
@@ -280,8 +280,8 @@ qstring_setup(qstringObject *self, PyObject *str, const char *enc)
     /* FIXME: remove this orrible strdup */
     if (enc) self->encoding = strdup(enc);
 
+    Py_INCREF(str);
     self->wrapped = str;
-    Py_INCREF(self->wrapped);
 
     Dprintf("qstring_setup: good qstring object at %p, refcnt = "
         FORMAT_CODE_PY_SSIZE_T,
@@ -306,9 +306,9 @@ qstring_dealloc(PyObject* obj)
 {
     qstringObject *self = (qstringObject *)obj;
 
-    Py_XDECREF(self->wrapped);
+    Py_CLEAR(self->wrapped);
-    Py_XDECREF(self->buffer);
+    Py_CLEAR(self->buffer);
-    Py_XDECREF(self->conn);
+    Py_CLEAR(self->conn);
 
     if (self->encoding) free(self->encoding);
 

psycopg/cursor_type.c

@@ -1688,7 +1688,7 @@ cursor_repr(cursorObject *self)
 static int
 cursor_traverse(cursorObject *self, visitproc visit, void *arg)
 {
-    Py_VISIT(self->conn);
+    Py_VISIT((PyObject *)self->conn);
     Py_VISIT(self->description);
     Py_VISIT(self->pgstatus);
     Py_VISIT(self->casts);