@@ -35,22 +35,22 @@ void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_type)sobj, Error **
def gen_visit_fields_decl(typ):
- ret = ''
- if typ.name not in struct_fields_seen:
- ret += mcgen('''
+ if typ.is_empty() or typ.name in struct_fields_seen:
+ return ''
+
+ struct_fields_seen.add(typ.name)
+ return mcgen('''
static void visit_type_%(c_type)s_fields(Visitor *v, %(c_type)s **obj, Error **errp);
''',
- c_type=typ.c_name())
- struct_fields_seen.add(typ.name)
- return ret
+ c_type=typ.c_name())
def gen_visit_implicit_struct(typ):
- if typ in implicit_structs_seen:
+ if typ.is_empty() or typ in implicit_structs_seen:
return ''
+
implicit_structs_seen.add(typ)
-
ret = gen_visit_fields_decl(typ)
ret += mcgen('''
@@ -74,7 +74,10 @@ static void visit_type_implicit_%(c_type)s(Visitor *v, %(c_type)s **obj, Error *
def gen_visit_struct_fields(name, base, members):
ret = ''
- if base:
+ if (not base or base.is_empty()) and not members:
+ return ret
+
+ if base and not base.is_empty():
ret += gen_visit_fields_decl(base)
struct_fields_seen.add(name)
@@ -87,7 +90,7 @@ static void visit_type_%(c_name)s_fields(Visitor *v, %(c_name)s **obj, Error **e
''',
c_name=c_name(name))
- if base:
+ if base and not base.is_empty():
ret += mcgen('''
visit_type_%(c_type)s_fields(v, (%(c_type)s **)obj, &err);
''',
@@ -96,13 +99,9 @@ static void visit_type_%(c_name)s_fields(Visitor *v, %(c_name)s **obj, Error **e
ret += gen_visit_fields(members, prefix='(*obj)->')
- # 'goto out' produced for base, and by gen_visit_fields() for each member
- if base or members:
- ret += mcgen('''
+ ret += mcgen('''
out:
-''')
- ret += mcgen('''
error_propagate(errp, err);
}
''')
@@ -129,7 +128,14 @@ void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj, Error
if (!*obj) {
goto out_obj;
}
+''',
+ name=name, c_name=c_name(name))
+ if (base and not base.is_empty()) or members:
+ ret += mcgen('''
visit_type_%(c_name)s_fields(v, obj, &err);
+''',
+ c_name=c_name(name))
+ ret += mcgen('''
out_obj:
error_propagate(errp, err);
err = NULL;
@@ -137,8 +143,7 @@ out_obj:
out:
error_propagate(errp, err);
}
-''',
- c_name=c_name(name))
+''')
return ret
@@ -300,7 +305,7 @@ void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj, Error
''',
c_type=simple_union_type.c_name(),
c_name=c_name(var.name))
- else:
+ elif not var.type.is_empty():
ret += mcgen('''
visit_type_implicit_%(c_type)s(v, &(*obj)->u.%(c_name)s, &err);
''',
For empty structs, such as the 'Abort' helper type used as part of the 'transaction' command, we were emitting a no-op visit_type_FOO_fields(). Optimize things to instead omit calls for empty structs. Generated code changes resemble: |-static void visit_type_Abort_fields(Visitor *v, Abort **obj, Error **errp) |-{ |- Error *err = NULL; |- |- error_propagate(errp, err); |-} |- | void visit_type_Abort(Visitor *v, const char *name, Abort **obj, Error **errp) | { | Error *err = NULL; |@@ -112,7 +105,6 @@ void visit_type_Abort(Visitor *v, Abort | if (!*obj) { | goto out_obj; | } |- visit_type_Abort_fields(v, obj, &err); | out_obj: | error_propagate(errp, err); Another reason for doing this optimization is that it gets us closer to merging the code for visiting structs and unions: since flat unions have no local members, they do not need to have a visit_type_UNION_fields() emitted, even when they start sharing the code used to visit structs. Signed-off-by: Eric Blake <eblake@redhat.com> --- v8: rebase to earlier changes v7: rebase to earlier changes v6: new patch --- scripts/qapi-visit.py | 41 +++++++++++++++++++++++------------------ 1 file changed, 23 insertions(+), 18 deletions(-)