qapi: Add visitor for implicit structs

These can be used when an embedded struct is parsed and members not
belonging to the struct may be present in the input (e.g. parsing a
flat namespace QMP union, where fields from both the base and one
of the alternative types are mixed in the JSON object)

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/qapi/qapi-visit-core.c b/qapi/qapi-visit-core.c
index 401ee6e597..9b4d51bc0a 100644
--- a/qapi/qapi-visit-core.c
+++ b/qapi/qapi-visit-core.c
@@ -45,6 +45,22 @@ void visit_end_struct(Visitor *v, Error **errp)
     v->end_struct(v, errp);
 }
 
+void visit_start_implicit_struct(Visitor *v, void **obj, size_t size,
+                                 Error **errp)
+{
+    if (!error_is_set(errp) && v->start_implicit_struct) {
+        v->start_implicit_struct(v, obj, size, errp);
+    }
+}
+
+void visit_end_implicit_struct(Visitor *v, Error **errp)
+{
+    assert(!error_is_set(errp));
+    if (v->end_implicit_struct) {
+        v->end_implicit_struct(v, errp);
+    }
+}
+
 void visit_start_list(Visitor *v, const char *name, Error **errp)
 {
     if (!error_is_set(errp)) {