string-input-visitor: Favor new visit_free() function

Now that we have a polymorphic visit_free(), we no longer need
string_input_visitor_cleanup(); which in turn means we no longer
need to return a subtype from string_input_visitor_new() nor a
public upcast function.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1465490926-28625-7-git-send-email-eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

include/qapi/string-input-visitor.h

@@ -22,9 +22,6 @@ typedef struct StringInputVisitor StringInputVisitor;
  * QAPI structs, alternates, null, or arbitrary QTypes.  It also
  * requires a non-null list argument to visit_start_list().
  */
-StringInputVisitor *string_input_visitor_new(const char *str);
+Visitor *string_input_visitor_new(const char *str);
-void string_input_visitor_cleanup(StringInputVisitor *v);
-
-Visitor *string_input_get_visitor(StringInputVisitor *v);
 
 #endif

qapi/string-input-visitor.c

@@ -326,26 +326,16 @@ static void parse_optional(Visitor *v, const char *name, bool *present)
     *present = true;
 }
 
-Visitor *string_input_get_visitor(StringInputVisitor *v)
-{
-    return &v->visitor;
-}
-
 static void string_input_free(Visitor *v)
 {
     StringInputVisitor *siv = to_siv(v);
 
-    string_input_visitor_cleanup(siv);
+    g_list_foreach(siv->ranges, free_range, NULL);
+    g_list_free(siv->ranges);
+    g_free(siv);
 }
 
-void string_input_visitor_cleanup(StringInputVisitor *v)
+Visitor *string_input_visitor_new(const char *str)
-{
-    g_list_foreach(v->ranges, free_range, NULL);
-    g_list_free(v->ranges);
-    g_free(v);
-}
-
-StringInputVisitor *string_input_visitor_new(const char *str)
 {
     StringInputVisitor *v;
 
@@ -365,5 +355,5 @@ StringInputVisitor *string_input_visitor_new(const char *str)
     v->visitor.free = string_input_free;
 
     v->string = str;
-    return v;
+    return &v->visitor;
 }

qom/object.c

@@ -1222,7 +1222,7 @@ int object_property_get_enum(Object *obj, const char *name,
 {
     Error *err = NULL;
     StringOutputVisitor *sov;
-    StringInputVisitor *siv;
+    Visitor *v;
     char *str;
     int ret;
     ObjectProperty *prop = object_property_find(obj, name, errp);
@@ -1249,13 +1249,12 @@ int object_property_get_enum(Object *obj, const char *name,
         return 0;
     }
     str = string_output_get_string(sov);
-    siv = string_input_visitor_new(str);
     string_output_visitor_cleanup(sov);
-    visit_type_enum(string_input_get_visitor(siv), name, &ret,
+    v = string_input_visitor_new(str);
-                    enumprop->strings, errp);
+    visit_type_enum(v, name, &ret, enumprop->strings, errp);
 
     g_free(str);
-    string_input_visitor_cleanup(siv);
+    visit_free(v);
 
     return ret;
 }
@@ -1265,7 +1264,7 @@ void object_property_get_uint16List(Object *obj, const char *name,
 {
     Error *err = NULL;
     StringOutputVisitor *ov;
-    StringInputVisitor *iv;
+    Visitor *v;
     char *str;
 
     ov = string_output_visitor_new(false);
@@ -1276,11 +1275,11 @@ void object_property_get_uint16List(Object *obj, const char *name,
         goto out;
     }
     str = string_output_get_string(ov);
-    iv = string_input_visitor_new(str);
+    v = string_input_visitor_new(str);
-    visit_type_uint16List(string_input_get_visitor(iv), NULL, list, errp);
+    visit_type_uint16List(v, NULL, list, errp);
 
     g_free(str);
-    string_input_visitor_cleanup(iv);
+    visit_free(v);
 out:
     string_output_visitor_cleanup(ov);
 }
@@ -1288,11 +1287,9 @@ out:
 void object_property_parse(Object *obj, const char *string,
                            const char *name, Error **errp)
 {
-    StringInputVisitor *siv;
+    Visitor *v = string_input_visitor_new(string);
-    siv = string_input_visitor_new(string);
+    object_property_set(obj, v, name, errp);
-    object_property_set(obj, string_input_get_visitor(siv), name, errp);
+    visit_free(v);
-
-    string_input_visitor_cleanup(siv);
 }
 
 char *object_property_print(Object *obj, const char *name, bool human,

tests/test-string-input-visitor.c

@@ -20,15 +20,15 @@
 #include "qapi/qmp/types.h"
 
 typedef struct TestInputVisitorData {
-    StringInputVisitor *siv;
+    Visitor *v;
 } TestInputVisitorData;
 
 static void visitor_input_teardown(TestInputVisitorData *data,
                                    const void *unused)
 {
-    if (data->siv) {
+    if (data->v) {
-        string_input_visitor_cleanup(data->siv);
+        visit_free(data->v);
-        data->siv = NULL;
+        data->v = NULL;
     }
 }
 
@@ -39,15 +39,9 @@ static
 Visitor *visitor_input_test_init(TestInputVisitorData *data,
                                  const char *string)
 {
-    Visitor *v;
+    data->v = string_input_visitor_new(string);
-
+    g_assert(data->v);
-    data->siv = string_input_visitor_new(string);
+    return data->v;
-    g_assert(data->siv != NULL);
-
-    v = string_input_get_visitor(data->siv);
-    g_assert(v != NULL);
-
-    return v;
 }
 
 static void test_visitor_in_int(TestInputVisitorData *data,
@@ -199,8 +193,6 @@ static void test_visitor_in_enum(TestInputVisitorData *data,
 
         visitor_input_teardown(data, NULL);
     }
-
-    data->siv = NULL;
 }
 
 /* Try to crash the visitors */

tests/test-visitor-serialization.c

@@ -1056,7 +1056,7 @@ static void qmp_cleanup(void *datap)
 typedef struct StringSerializeData {
     char *string;
     StringOutputVisitor *sov;
-    StringInputVisitor *siv;
+    Visitor *siv;
 } StringSerializeData;
 
 static void string_serialize(void *native_in, void **datap,
@@ -1076,7 +1076,7 @@ static void string_deserialize(void **native_out, void *datap,
 
     d->string = string_output_get_string(d->sov);
     d->siv = string_input_visitor_new(d->string);
-    visit(string_input_get_visitor(d->siv), native_out, errp);
+    visit(d->siv, native_out, errp);
 }
 
 static void string_cleanup(void *datap)
@@ -1084,7 +1084,7 @@ static void string_cleanup(void *datap)
     StringSerializeData *d = datap;
 
     string_output_visitor_cleanup(d->sov);
-    string_input_visitor_cleanup(d->siv);
+    visit_free(d->siv);
     g_free(d->string);
     g_free(d);
 }