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qapi: Create simple union type member earlier 

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 (renaming _make_tag_enum() to
_make_implicit_tag()), 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>
Message-Id: <1444710158-8723-10-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Eric Blake 2015-10-12 22:22:29 -06:00 committed by Markus Armbruster
parent 9f08c8ec73
commit 46292ba75c
1 changed files with 18 additions and 17 deletions
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35
scripts/qapi.py
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@ -1010,18 +1010,18 @@ def check(self, schema, all_members, seen):
class QAPISchemaObjectTypeVariants(object):
def __init__(self, tag_name, tag_enum, variants):
assert tag_name is None or isinstance(tag_name, str)
assert tag_enum is None or isinstance(tag_enum, str)
def __init__(self, tag_name, tag_member, variants):
# Flat unions pass tag_name but not tag_member.
# Simple unions and alternates pass tag_member but not tag_name.
# After check(), tag_member is always set, and tag_name remains
# a reliable witness of being used by a flat union.
assert bool(tag_member) != bool(tag_name)
assert (isinstance(tag_name, str) 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)
self.tag_member = tag_member
self.variants = variants
def check(self, schema, members, seen):
@ -1231,28 +1231,29 @@ def _make_simple_variant(self, case, typ):
[self._make_member('data', typ)])
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])
def _make_implicit_tag(self, type_name, 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']
data = expr['data']
base = expr.get('base')
tag_name = expr.get('discriminator')
tag_enum = None
tag_member = None
if tag_name:
variants = [self._make_variant(key, value)
for (key, value) in data.iteritems()]
else:
variants = [self._make_simple_variant(key, value)
for (key, value) in data.iteritems()]
tag_enum = self._make_tag_enum(name, variants)
tag_member = self._make_implicit_tag(name, variants)
self._def_entity(
QAPISchemaObjectType(name, info, base,
self._make_members(OrderedDict()),
QAPISchemaObjectTypeVariants(tag_name,
tag_enum,
tag_member,
variants)))
def _def_alternate_type(self, expr, info):
@ -1260,11 +1261,11 @@ def _def_alternate_type(self, expr, info):
data = expr['data']
variants = [self._make_variant(key, value)
for (key, value) in data.iteritems()]
tag_enum = self._make_tag_enum(name, variants)
tag_member = self._make_implicit_tag(name, variants)
self._def_entity(
QAPISchemaAlternateType(name, info,
QAPISchemaObjectTypeVariants(None,
tag_enum,
tag_member,
variants)))
def _def_command(self, expr, info):