qapi: Use QAPI_LIST_PREPEND() where possible

Anywhere we create a list of just one item or by prepending items
(typically because order doesn't matter), we can use
QAPI_LIST_PREPEND().  But places where we must keep the list in order
by appending remain open-coded until later patches.

Note that as a side effect, this also performs a cleanup of two minor
issues in qga/commands-posix.c: the old code was performing
 new = g_malloc0(sizeof(*ret));
which 1) is confusing because you have to verify whether 'new' and
'ret' are variables with the same type, and 2) would conflict with C++
compilation (not an actual problem for this file, but makes
copy-and-paste harder).

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20201113011340.463563-5-eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
[Straightforward conflicts due to commit a8aa94b5f8 "qga: update
schema for guest-get-disks 'dependents' field" and commit a10b453a52
"target/mips: Move mips_cpu_add_definition() from helper.c to cpu.c"
resolved.  Commit message tweaked.]
Signed-off-by: Markus Armbruster <armbru@redhat.com>

1 files changed, 8 insertions, 21 deletions

diff --git a/qom/qom-qmp-cmds.c b/qom/qom-qmp-cmds.c
index 2dd233f..b40ac39 100644
--- a/qom/qom-qmp-cmds.c
+++ b/qom/qom-qmp-cmds.c
@@ -46,14 +46,12 @@ ObjectPropertyInfoList *qmp_qom_list(const char *path, Error **errp)
 
     object_property_iter_init(&iter, obj);
     while ((prop = object_property_iter_next(&iter))) {
-        ObjectPropertyInfoList *entry = g_malloc0(sizeof(*entry));
+        ObjectPropertyInfo *value = g_malloc0(sizeof(ObjectPropertyInfo));
 
-        entry->value = g_malloc0(sizeof(ObjectPropertyInfo));
-        entry->next = props;
-        props = entry;
+        QAPI_LIST_PREPEND(props, value);
 
-        entry->value->name = g_strdup(prop->name);
-        entry->value->type = g_strdup(prop->type);
+        value->name = g_strdup(prop->name);
+        value->type = g_strdup(prop->type);
     }
 
     return props;
@@ -90,7 +88,7 @@ QObject *qmp_qom_get(const char *path, const char *property, Error **errp)
 
 static void qom_list_types_tramp(ObjectClass *klass, void *data)
 {
-    ObjectTypeInfoList *e, **pret = data;
+    ObjectTypeInfoList **pret = data;
     ObjectTypeInfo *info;
     ObjectClass *parent = object_class_get_parent(klass);
 
@@ -102,10 +100,7 @@ static void qom_list_types_tramp(ObjectClass *klass, void *data)
         info->parent = g_strdup(object_class_get_name(parent));
     }
 
-    e = g_malloc0(sizeof(*e));
-    e->value = info;
-    e->next = *pret;
-    *pret = e;
+    QAPI_LIST_PREPEND(*pret, info);
 }
 
 ObjectTypeInfoList *qmp_qom_list_types(bool has_implements,
@@ -150,7 +145,6 @@ ObjectPropertyInfoList *qmp_device_list_properties(const char *typename,
     object_property_iter_init(&iter, obj);
     while ((prop = object_property_iter_next(&iter))) {
         ObjectPropertyInfo *info;
-        ObjectPropertyInfoList *entry;
 
         /* Skip Object and DeviceState properties */
         if (strcmp(prop->name, "type") == 0 ||
@@ -176,10 +170,7 @@ ObjectPropertyInfoList *qmp_device_list_properties(const char *typename,
         info->default_value = qobject_ref(prop->defval);
         info->has_default_value = !!info->default_value;
 
-        entry = g_malloc0(sizeof(*entry));
-        entry->value = info;
-        entry->next = prop_list;
-        prop_list = entry;
+        QAPI_LIST_PREPEND(prop_list, info);
     }
 
     object_unref(obj);
@@ -217,7 +208,6 @@ ObjectPropertyInfoList *qmp_qom_list_properties(const char *typename,
     }
     while ((prop = object_property_iter_next(&iter))) {
         ObjectPropertyInfo *info;
-        ObjectPropertyInfoList *entry;
 
         info = g_malloc0(sizeof(*info));
         info->name = g_strdup(prop->name);
@@ -225,10 +215,7 @@ ObjectPropertyInfoList *qmp_qom_list_properties(const char *typename,
         info->has_description = !!prop->description;
         info->description = g_strdup(prop->description);
 
-        entry = g_malloc0(sizeof(*entry));
-        entry->value = info;
-        entry->next = prop_list;
-        prop_list = entry;
+        QAPI_LIST_PREPEND(prop_list, info);
     }
 
     object_unref(obj);