qapi: Fix alternates that accept 'number' but not 'int'

The QMP input visitor allows integral values to be assigned by
promotion to a QTYPE_QFLOAT.  However, when parsing an alternate,
we did not take this into account, such that an alternate that
accepts 'number' and some other type, but not 'int', would reject
integral values.

With this patch, we now have the following desirable table:

    alternate has      case selected for
    'int'  'number'    QTYPE_QINT  QTYPE_QFLOAT
      no        no     error       error
      no       yes     'number'    'number'
     yes        no     'int'       error
     yes       yes     'int'       'number'

While it is unlikely that we will ever use 'number' in an
alternate other than in the testsuite, it never hurts to be
more precise in what we allow.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1449033659-25497-8-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/qapi/visitor.h b/include/qapi/visitor.h
index 6d25ad2..1414de1 100644
--- a/include/qapi/visitor.h
+++ b/include/qapi/visitor.h
@@ -43,8 +43,9 @@ void visit_optional(Visitor *v, bool *present, const char *name,
  * Determine the qtype of the item @name in the current object visit.
  * For input visitors, set *@type to the correct qtype of a qapi
  * alternate type; for other visitors, leave *@type unchanged.
+ * If @promote_int, treat integers as QTYPE_FLOAT.
  */
-void visit_get_next_type(Visitor *v, QType *type,
+void visit_get_next_type(Visitor *v, QType *type, bool promote_int,
                          const char *name, Error **errp);
 void visit_type_enum(Visitor *v, int *obj, const char * const strings[],
                      const char *kind, const char *name, Error **errp);