Change objfile_to_objfile_object to return a new reference

This changes objfile_to_objfile_object to return a new references and
fixes up all the uses.

gdb/ChangeLog
2018-09-16  Tom Tromey  <tom@tromey.com>

	* python/py-progspace.c (pspy_get_objfiles): Update.
	* python/python-internal.h (objfile_to_objfile_object): Change
	return type.
	* python/py-newobjfileevent.c (create_new_objfile_event_object):
	Update.
	* python/py-xmethods.c (gdbpy_get_matching_xmethod_workers):
	Update.
	* python/python.c (gdbpy_get_current_objfile): Update.
	(gdbpy_objfiles): Update.
	* python/py-objfile.c (objfpy_get_owner, gdbpy_lookup_objfile):
	Update.
	(objfile_to_objfile_object): Return a new reference.
	* python/py-symtab.c (stpy_get_objfile): Update.
	* python/py-prettyprint.c (find_pretty_printer_from_objfiles):
	Update.

gdb/ChangeLog

@@ -1,3 +1,21 @@
+2018-09-16  Tom Tromey  <tom@tromey.com>
+
+	* python/py-progspace.c (pspy_get_objfiles): Update.
+	* python/python-internal.h (objfile_to_objfile_object): Change
+	return type.
+	* python/py-newobjfileevent.c (create_new_objfile_event_object):
+	Update.
+	* python/py-xmethods.c (gdbpy_get_matching_xmethod_workers):
+	Update.
+	* python/python.c (gdbpy_get_current_objfile): Update.
+	(gdbpy_objfiles): Update.
+	* python/py-objfile.c (objfpy_get_owner, gdbpy_lookup_objfile):
+	Update.
+	(objfile_to_objfile_object): Return a new reference.
+	* python/py-symtab.c (stpy_get_objfile): Update.
+	* python/py-prettyprint.c (find_pretty_printer_from_objfiles):
+	Update.
+
 2018-09-16  Tom Tromey  <tom@tromey.com>
 
 	* python/py-inferior.c (infpy_get_progspace): Update.

gdb/python/py-newobjfileevent.c

@@ -28,12 +28,10 @@ create_new_objfile_event_object (struct objfile *objfile)
   if (objfile_event == NULL)
     return NULL;
 
-  /* Note that objfile_to_objfile_object returns a borrowed reference,
-     so we don't need a decref here.  */
-  PyObject *py_objfile = objfile_to_objfile_object (objfile);
-  if (!py_objfile || evpy_add_attribute (objfile_event.get (),
-                                         "new_objfile",
-                                         py_objfile) < 0)
+  gdbpy_ref<> py_objfile = objfile_to_objfile_object (objfile);
+  if (py_objfile == NULL || evpy_add_attribute (objfile_event.get (),
+						"new_objfile",
+						py_objfile.get ()) < 0)
     return NULL;
 
   return objfile_event;

gdb/python/py-objfile.c

@@ -115,12 +115,7 @@ objfpy_get_owner (PyObject *self, void *closure)
 
   owner = objfile->separate_debug_objfile_backlink;
   if (owner != NULL)
-    {
-      PyObject *result = objfile_to_objfile_object (owner);
-
-      Py_XINCREF (result);
-      return result;
-    }
+    return objfile_to_objfile_object (owner).release ();
   Py_RETURN_NONE;
 }
 
@@ -602,12 +597,7 @@ gdbpy_lookup_objfile (PyObject *self, PyObject *args, PyObject *kw)
     objfile = objfpy_lookup_objfile_by_name (name);
 
   if (objfile != NULL)
-    {
-      PyObject *result = objfile_to_objfile_object (objfile);
-
-      Py_XINCREF (result);
-      return result;
-    }
+    return objfile_to_objfile_object (objfile).release ();
 
   PyErr_SetString (PyExc_ValueError, _("Objfile not found."));
   return NULL;
@@ -625,30 +615,31 @@ py_free_objfile (struct objfile *objfile, void *datum)
   object->objfile = NULL;
 }
 
-/* Return a borrowed reference to the Python object of type Objfile
+/* Return a new reference to the Python object of type Objfile
    representing OBJFILE.  If the object has already been created,
    return it.  Otherwise, create it.  Return NULL and set the Python
    error on failure.  */
 
-PyObject *
+gdbpy_ref<>
 objfile_to_objfile_object (struct objfile *objfile)
 {
-  gdbpy_ref<objfile_object> object
-    ((objfile_object *) objfile_data (objfile, objfpy_objfile_data_key));
-  if (object == NULL)
+  PyObject *result
+    = ((PyObject *) objfile_data (objfile, objfpy_objfile_data_key));
+  if (result == NULL)
     {
-      object.reset (PyObject_New (objfile_object, &objfile_object_type));
-      if (object != NULL)
-	{
-	  if (!objfpy_initialize (object.get ()))
-	    return NULL;
+      gdbpy_ref<objfile_object> object
+	((objfile_object *) PyObject_New (objfile_object, &objfile_object_type));
+      if (object == NULL)
+	return NULL;
+      if (!objfpy_initialize (object.get ()))
+	return NULL;
 
-	  object->objfile = objfile;
-	  set_objfile_data (objfile, objfpy_objfile_data_key, object.get ());
-	}
+      object->objfile = objfile;
+      set_objfile_data (objfile, objfpy_objfile_data_key, object.get ());
+      result = (PyObject *) object.release ();
     }
 
-  return (PyObject *) object.release ();
+  return gdbpy_ref<>::new_reference (result);
 }
 
 int

gdb/python/py-prettyprint.c

@@ -97,15 +97,15 @@ find_pretty_printer_from_objfiles (PyObject *value)
 
   ALL_OBJFILES (obj)
   {
-    PyObject *objf = objfile_to_objfile_object (obj);
-    if (!objf)
+    gdbpy_ref<> objf = objfile_to_objfile_object (obj);
+    if (objf == NULL)
       {
 	/* Ignore the error and continue.  */
 	PyErr_Clear ();
 	continue;
       }
 
-    gdbpy_ref<> pp_list (objfpy_get_printers (objf, NULL));
+    gdbpy_ref<> pp_list (objfpy_get_printers (objf.get (), NULL));
     gdbpy_ref<> function (search_pp_list (pp_list.get (), value));
 
     /* If there is an error in any objfile list, abort the search and exit.  */

gdb/python/py-progspace.c

@@ -344,9 +344,10 @@ pspy_get_objfiles (PyObject *self_, PyObject *args)
 
       ALL_PSPACE_OBJFILES (self->pspace, objf)
 	{
-	  PyObject *item = objfile_to_objfile_object (objf);
+	  gdbpy_ref<> item = objfile_to_objfile_object (objf);
 
-	  if (!item || PyList_Append (list.get (), item) == -1)
+	  if (item == nullptr
+	      || PyList_Append (list.get (), item.get ()) == -1)
 	    return NULL;
 	}
     }

gdb/python/py-symtab.c

@@ -117,13 +117,10 @@ static PyObject *
 stpy_get_objfile (PyObject *self, void *closure)
 {
   struct symtab *symtab = NULL;
-  PyObject *result;
 
   STPY_REQUIRE_VALID (self, symtab);
 
-  result = objfile_to_objfile_object (SYMTAB_OBJFILE (symtab));
-  Py_XINCREF (result);
-  return result;
+  return objfile_to_objfile_object (SYMTAB_OBJFILE (symtab)).release ();
 }
 
 /* Getter function for symtab.producer.  */

gdb/python/py-xmethods.c

@@ -147,7 +147,7 @@ gdbpy_get_matching_xmethod_workers
      list individually, but there's no data yet to show it's needed.  */
   ALL_OBJFILES (objfile)
     {
-      PyObject *py_objfile = objfile_to_objfile_object (objfile);
+      gdbpy_ref<> py_objfile = objfile_to_objfile_object (objfile);
 
       if (py_objfile == NULL)
 	{
@@ -155,7 +155,8 @@ gdbpy_get_matching_xmethod_workers
 	  return EXT_LANG_RC_ERROR;
 	}
 
-      gdbpy_ref<> objfile_matchers (objfpy_get_xmethods (py_objfile, NULL));
+      gdbpy_ref<> objfile_matchers (objfpy_get_xmethods (py_objfile.get (),
+							 NULL));
       gdbpy_ref<> temp (PySequence_Concat (py_xmethod_matcher_list.get (),
 					   objfile_matchers.get ()));
       if (temp == NULL)

gdb/python/python-internal.h

@@ -522,8 +522,7 @@ PyObject *pspy_get_frame_filters (PyObject *, void *);
 PyObject *pspy_get_frame_unwinders (PyObject *, void *);
 PyObject *pspy_get_xmethods (PyObject *, void *);
 
-PyObject *objfile_to_objfile_object (struct objfile *)
-    CPYCHECKER_RETURNS_BORROWED_REF;
+gdbpy_ref<> objfile_to_objfile_object (struct objfile *);
 PyObject *objfpy_get_printers (PyObject *, void *);
 PyObject *objfpy_get_frame_filters (PyObject *, void *);
 PyObject *objfpy_get_frame_unwinders (PyObject *, void *);

gdb/python/python.c

@@ -1359,15 +1359,10 @@ gdbpy_execute_objfile_script (const struct extension_language_defn *extlang,
 static PyObject *
 gdbpy_get_current_objfile (PyObject *unused1, PyObject *unused2)
 {
-  PyObject *result;
-
   if (! gdbpy_current_objfile)
     Py_RETURN_NONE;
 
-  result = objfile_to_objfile_object (gdbpy_current_objfile);
-  if (result)
-    Py_INCREF (result);
-  return result;
+  return objfile_to_objfile_object (gdbpy_current_objfile).release ();
 }
 
 /* Compute the list of active python type printers and store them in