qapi: Inline gen_visit_members() into lone caller

Commit 82ca8e46 noticed that we had multiple implementations of
visiting every member of a struct, and consolidated it into
gen_visit_fields() (now gen_visit_members()) with enough
parameters to cater to slight differences between the clients.
But recent exposure of implicit types has meant that we are now
down to a single use of that method, so we can clean up the
unused conditionals and just inline it into the remaining
caller: gen_visit_object_members().

Likewise, gen_err_check() no longer needs optional parameters,
as the lone use of non-defaults was via gen_visit_members().

No change to generated code.

Suggested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-11-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

scripts/qapi-visit.py

@@ -51,7 +51,24 @@ void visit_type_%(c_name)s_members(Visitor *v, %(c_name)s *obj, Error **errp)
                      c_type=base.c_name())
         ret += gen_err_check()
 
-    ret += gen_visit_members(members, prefix='obj->')
+    for memb in members:
+        if memb.optional:
+            ret += mcgen('''
+    if (visit_optional(v, "%(name)s", &obj->has_%(c_name)s)) {
+''',
+                         name=memb.name, c_name=c_name(memb.name))
+            push_indent()
+        ret += mcgen('''
+    visit_type_%(c_type)s(v, "%(name)s", &obj->%(c_name)s, &err);
+''',
+                     c_type=memb.type.c_name(), name=memb.name,
+                     c_name=c_name(memb.name))
+        ret += gen_err_check()
+        if memb.optional:
+            pop_indent()
+            ret += mcgen('''
+    }
+''')
 
     if variants:
         ret += mcgen('''
@@ -90,8 +107,8 @@ void visit_type_%(c_name)s_members(Visitor *v, %(c_name)s *obj, Error **errp)
     }
 ''')
 
-    # 'goto out' produced for base, by gen_visit_members() for each member,
+    # 'goto out' produced for base, for each member, and if variants were
-    # and if variants were present
+    # present
     if base or members or variants:
         ret += mcgen('''
 

scripts/qapi.py

@@ -1657,54 +1657,12 @@ def gen_params(arg_type, extra):
     return ret
 
 
-def gen_err_check(label='out', skiperr=False):
+def gen_err_check():
-    if skiperr:
-        return ''
     return mcgen('''
     if (err) {
-        goto %(label)s;
+        goto out;
-    }
-''',
-                 label=label)
-
-
-def gen_visit_members(members, prefix='', need_cast=False, skiperr=False,
-                      label='out'):
-    ret = ''
-    if skiperr:
-        errparg = 'NULL'
-    else:
-        errparg = '&err'
-
-    for memb in members:
-        if memb.optional:
-            ret += mcgen('''
-    if (visit_optional(v, "%(name)s", &%(prefix)shas_%(c_name)s)) {
-''',
-                         prefix=prefix, c_name=c_name(memb.name),
-                         name=memb.name)
-            push_indent()
-
-        # Ugly: sometimes we need to cast away const
-        if need_cast and memb.type.name == 'str':
-            cast = '(char **)'
-        else:
-            cast = ''
-
-        ret += mcgen('''
-    visit_type_%(c_type)s(v, "%(name)s", %(cast)s&%(prefix)s%(c_name)s, %(errp)s);
-''',
-                     c_type=memb.type.c_name(), prefix=prefix, cast=cast,
-                     c_name=c_name(memb.name), name=memb.name,
-                     errp=errparg)
-        ret += gen_err_check(skiperr=skiperr, label=label)
-
-        if memb.optional:
-            pop_indent()
-            ret += mcgen('''
     }
 ''')
-    return ret
 
 
 #