qom: Change object property iterator API contract

Currently the ObjectProperty iterator API works as follows:

  ObjectPropertyIterator *iter;

  iter = object_property_iter_init(obj);
  while ((prop = object_property_iter_next(iter))) {
     ...
  }
  object_property_iter_free(iter);

This has the benefit that the ObjectPropertyIterator struct
can be opaque, but has the downside that callers need to
explicitly call a free function. It is also not in keeping
with iterator style used elsewhere in QEMU/GLib2.

This patch changes the API to use stack allocation instead:

  ObjectPropertyIterator iter;

  object_property_iter_init(&iter, obj);
  while ((prop = object_property_iter_next(&iter))) {
     ...
  }

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[AF: Fused ObjectPropertyIterator struct with typedef]
Signed-off-by: Andreas Färber <afaerber@suse.de>

1 files changed, 3 insertions, 4 deletions

diff --git a/tests/check-qom-proplist.c b/tests/check-qom-proplist.c
index 5167e78e93..448d270b68 100644
--- a/tests/check-qom-proplist.c
+++ b/tests/check-qom-proplist.c
@@ -455,11 +455,11 @@ static void test_dummy_iterator(void)
                               NULL));
 
     ObjectProperty *prop;
-    ObjectPropertyIterator *iter;
+    ObjectPropertyIterator iter;
     bool seenbv = false, seensv = false, seenav = false, seentype;
 
-    iter = object_property_iter_init(OBJECT(dobj));
-    while ((prop = object_property_iter_next(iter))) {
+    object_property_iter_init(&iter, OBJECT(dobj));
+    while ((prop = object_property_iter_next(&iter))) {
         if (g_str_equal(prop->name, "bv")) {
             seenbv = true;
         } else if (g_str_equal(prop->name, "sv")) {
@@ -474,7 +474,6 @@ static void test_dummy_iterator(void)
             g_assert_not_reached();
         }
     }
-    object_property_iter_free(iter);
     g_assert(seenbv);
     g_assert(seenav);
     g_assert(seensv);