qapi: Drop dead visitor code related to nested structs

Now that we no longer have nested structs to visit, the use of
prefix strings is no longer required.  Remove the code that is
no longer reachable.
Signed-off-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>

scripts/qapi-visit.py

@@ -43,50 +43,43 @@ static void visit_type_implicit_%(c_type)s(Visitor *m, %(c_type)s **obj, Error *
 ''',
                  c_type=type_name(type))
 
-def generate_visit_struct_fields(name, field_prefix, fn_prefix, members, base = None):
+def generate_visit_struct_fields(name, members, base = None):
     substructs = []
     ret = ''
-    if not fn_prefix:
-        full_name = name
-    else:
-        full_name = "%s_%s" % (name, fn_prefix)
 
     if base:
         ret += generate_visit_implicit_struct(base)
 
     ret += mcgen('''
 
-static void visit_type_%(full_name)s_fields(Visitor *m, %(name)s **obj, Error **errp)
+static void visit_type_%(name)s_fields(Visitor *m, %(name)s **obj, Error **errp)
 {
     Error *err = NULL;
 ''',
-        name=name, full_name=full_name)
+                 name=name)
     push_indent()
 
     if base:
         ret += mcgen('''
-visit_type_implicit_%(type)s(m, &(*obj)->%(c_prefix)s%(c_name)s, &err);
+visit_type_implicit_%(type)s(m, &(*obj)->%(c_name)s, &err);
 if (err) {
     goto out;
 }
 ''',
-                     c_prefix=c_var(field_prefix),
                      type=type_name(base), c_name=c_var('base'))
 
     for argname, argentry, optional in parse_args(members):
         if optional:
             ret += mcgen('''
-visit_optional(m, &(*obj)->%(c_prefix)shas_%(c_name)s, "%(name)s", &err);
-if (!err && (*obj)->%(prefix)shas_%(c_name)s) {
+visit_optional(m, &(*obj)->has_%(c_name)s, "%(name)s", &err);
+if (!err && (*obj)->has_%(c_name)s) {
 ''',
-                         c_prefix=c_var(field_prefix), prefix=field_prefix,
                          c_name=c_var(argname), name=argname)
             push_indent()
 
         ret += mcgen('''
-visit_type_%(type)s(m, &(*obj)->%(c_prefix)s%(c_name)s, "%(name)s", &err);
+visit_type_%(type)s(m, &(*obj)->%(c_name)s, "%(name)s", &err);
 ''',
-                     c_prefix=c_var(field_prefix), prefix=field_prefix,
                      type=type_name(argentry), c_name=c_var(argname),
                      name=argname)
 
@@ -114,29 +107,11 @@ out:
     return ret
 
 
-def generate_visit_struct_body(field_prefix, name, members):
+def generate_visit_struct_body(name, members):
     ret = mcgen('''
     Error *err = NULL;
 
-''')
-
-    if not field_prefix:
-        full_name = name
-    else:
-        full_name = "%s_%s" % (field_prefix, name)
-
-    if len(field_prefix):
-        ret += mcgen('''
-    visit_start_struct(m, NULL, "", "%(name)s", 0, &err);
-''',
-                name=name)
-    else:
-        ret += mcgen('''
     visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(name)s), &err);
-''',
-                name=name)
-
-    ret += mcgen('''
     if (!err) {
         if (*obj) {
             visit_type_%(name)s_fields(m, obj, errp);
@@ -145,7 +120,7 @@ def generate_visit_struct_body(field_prefix, name, members):
     }
     error_propagate(errp, err);
 ''',
-        name=full_name)
+                name=name)
 
     return ret
 
@@ -155,7 +130,7 @@ def generate_visit_struct(expr):
     members = expr['data']
     base = expr.get('base')
 
-    ret = generate_visit_struct_fields(name, "", "", members, base)
+    ret = generate_visit_struct_fields(name, members, base)
 
     ret += mcgen('''
 
@@ -164,7 +139,7 @@ void visit_type_%(name)s(Visitor *m, %(name)s **obj, const char *name, Error **e
 ''',
                 name=name)
 
-    ret += generate_visit_struct_body("", name, members)
+    ret += generate_visit_struct_body(name, members)
 
     ret += mcgen('''
 }
@@ -288,7 +263,7 @@ def generate_visit_union(expr):
         assert discriminator
         base_fields = find_struct(base)['data'].copy()
         del base_fields[discriminator]
-        ret += generate_visit_struct_fields(name, "", "", base_fields)
+        ret += generate_visit_struct_fields(name, base_fields)
 
     if discriminator:
         for key in members: