[Qemu-devel] [PATCH v6 04/12] qapi: Create simple union type member earlier

[Eric Blake <eblake@redhat.com>]

For simple unions, we were creating the implicit 'type' tag
member during the QAPISchemaObjectTypeVariants constructor.
This is different from every other implicit QAPISchemaEntity
object, which get created by QAPISchema methods.  Hoist the
creation to the caller, and pass the entity rather than the
string name, so that we have the nice property that no
entities are created as a side effect within a different
entity.  A later patch will then have an easier time of
associating location info with each entity creation.

No change to generated code.

Signed-off-by: Eric Blake <eblake@redhat.com>

---
v6: New patch
---
 scripts/qapi.py | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/scripts/qapi.py b/scripts/qapi.py
index 15640b6..255001a 100644
--- a/scripts/qapi.py
+++ b/scripts/qapi.py
@@ -1010,18 +1010,16 @@ class QAPISchemaObjectTypeMember(object):


 class QAPISchemaObjectTypeVariants(object):
-    def __init__(self, tag_name, tag_enum, variants):
+    def __init__(self, tag_name, tag_member, variants):
         assert tag_name is None or isinstance(tag_name, str)
-        assert tag_enum is None or isinstance(tag_enum, str)
+        assert (tag_member is None or
+                isinstance(tag_member, QAPISchemaObjectTypeMember))
         for v in variants:
             assert isinstance(v, QAPISchemaObjectTypeVariant)
         self.tag_name = tag_name
         if tag_name:
-            assert not tag_enum
-            self.tag_member = None
-        else:
-            self.tag_member = QAPISchemaObjectTypeMember('type', tag_enum,
-                                                         False)
+            assert tag_member is None
+        self.tag_member = tag_member
         self.variants = variants

     def check(self, schema, members, seen):
@@ -1226,8 +1224,9 @@ class QAPISchema(object):
         return QAPISchemaObjectTypeVariant(case, typ)

     def _make_tag_enum(self, type_name, variants):
-        return self._make_implicit_enum_type(type_name,
-                                             [v.name for v in variants])
+        typ = self._make_implicit_enum_type(type_name,
+                                            [v.name for v in variants])
+        return QAPISchemaObjectTypeMember('type', typ, False)

     def _def_union_type(self, expr, info):
         name = expr['union']
-- 
2.4.3