[PATCH v2 09/19] qapi/schema: allow resolve_type to be used for built-in types

[John Snow <jsnow@redhat.com>]

allow resolve_type to be used for both built-in and user-specified
type definitions. In the event that the type cannot be resolved, assert
that 'info' and 'what' were both provided in order to create a usable
QAPISemError.

In practice, 'info' will only be None for built-in definitions, which
*should not fail* type lookup.

As a convenience, allow the 'what' and 'info' parameters to be elided
entirely so that it can be used as a can-not-fail version of
lookup_type.

Note: there are only three callsites to resolve_type at present where
"info" is perceived to be possibly None:

    1) QAPISchemaArrayType.check()
    2) QAPISchemaObjectTypeMember.check()
    3) QAPISchemaEvent.check()

    Of those three, only the first actually ever passes None; the other two
    are limited by their base class initializers which accept info=None, but
    neither actually use it in practice.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 scripts/qapi/schema.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scripts/qapi/schema.py b/scripts/qapi/schema.py
index 66a78f28fd4..a77b51d1b96 100644
--- a/scripts/qapi/schema.py
+++ b/scripts/qapi/schema.py
@@ -1001,9 +1001,10 @@ def lookup_type(self, name):
         assert typ is None or isinstance(typ, QAPISchemaType)
         return typ
 
-    def resolve_type(self, name, info, what):
+    def resolve_type(self, name, info=None, what=None):
         typ = self.lookup_type(name)
         if not typ:
+            assert info and what  # built-in types must not fail lookup
             if callable(what):
                 what = what(info)
             raise QAPISemError(
-- 
2.43.0