[PATCH v3] qapi: provide a friendly string representation of QAPI classes

[Daniel P . Berrangé]

If printing a QAPI schema object for debugging we get the classname and
a hex value for the instance:

  <qapi.schema.QAPISchemaEnumType object at 0x7f0ab4c2dad0>
  <qapi.schema.QAPISchemaObjectType object at 0x7f0ab4c2dd90>
  <qapi.schema.QAPISchemaArrayType object at 0x7f0ab4c2df90>

With this change we instead get the classname and the human friendly
name of the QAPI type instance:

  <QAPISchemaEnumType:CpuS390State at 0x7f0ab4c2dad0>
  <QAPISchemaObjectType:CpuInfoS390 at 0x7f0ab4c2dd90>
  <QAPISchemaArrayType:CpuInfoFastList at 0x7f0ab4c2df90>

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---

Changed in v3:

 - Retain the object hex ID in the new representation

 scripts/qapi/schema.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/scripts/qapi/schema.py b/scripts/qapi/schema.py
index 231ebf61ba..39c11bb52a 100644
--- a/scripts/qapi/schema.py
+++ b/scripts/qapi/schema.py
@@ -73,6 +73,12 @@ def __init__(self, name: str, info, doc, ifcond=None, 
features=None):
         self.features = features or []
         self._checked = False
 
+    def __repr__(self):
+        if self.name is not None:
+            return "<%s:%s at 0x%x>" % (type(self).__name__, self.name, 
id(self))
+        else:
+            return "<%s at 0x%x>" % (type(self).__name__, id(self))
+
     def c_name(self):
         return c_name(self.name)
 
-- 
2.41.0