qapi: Make input visitors detect unvisited list tails

Fix the design flaw demonstrated in the previous commit: new method
check_list() lets input visitors report that unvisited input remains
for a list, exactly like check_struct() lets them report that
unvisited input remains for a struct or union.

Implement the method for the qobject input visitor (straightforward),
and the string input visitor (less so, due to the magic list syntax
there).  The opts visitor's list magic is even more impenetrable, and
all I can do there today is a stub with a FIXME comment.  No worse
than before.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1488544368-30622-26-git-send-email-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/qapi/qapi-visit-core.c b/qapi/qapi-visit-core.c
index e6e93f02e6..43a09d147d 100644
--- a/qapi/qapi-visit-core.c
+++ b/qapi/qapi-visit-core.c
@@ -90,6 +90,14 @@ GenericList *visit_next_list(Visitor *v, GenericList *tail, size_t size)
     return v->next_list(v, tail, size);
 }
 
+void visit_check_list(Visitor *v, Error **errp)
+{
+    trace_visit_check_list(v);
+    if (v->check_list) {
+        v->check_list(v, errp);
+    }
+}
+
 void visit_end_list(Visitor *v, void **obj)
 {
     trace_visit_end_list(v, obj);