Right now, we emit the branches of union types as a boxed pointer,
and it suffices to have a forward declaration of the type. However,
a future patch will swap things to directly use the branch type,
instead of hiding it behind a pointer. For this to work, the
compiler needs the full definition of the type, not just a forward
declaration, prior to the union that is including the branch type.
This patch just adds topological sorting to hoist all types
mentioned in a branch of a union to be fully declared before the
union itself. The sort is always possible, because we do not
allow circular union types that include themselves as a direct
branch (it is, however, still possible to include a branch type
that itself has a pointer to the union, for a type that can
indirectly recursively nest itself - that remains safe, because
that the member of the branch type will remain a pointer, and the
QMP representation of such a type adds another {} for each recurring
layer of the union type).
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <
1455778109-6278-11-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
# QAPI types generator
#
# Copyright IBM, Corp. 2011
-# Copyright (c) 2013-2015 Red Hat Inc.
+# Copyright (c) 2013-2016 Red Hat Inc.
#
# Authors:
# Anthony Liguori <aliguori@us.ibm.com>
from qapi import *
+# variants must be emitted before their container; track what has already
+# been output
+objects_seen = set()
+
+
def gen_fwd_object_or_array(name):
return mcgen('''
def gen_object(name, base, members, variants):
- ret = mcgen('''
+ if name in objects_seen:
+ return ''
+ objects_seen.add(name)
+
+ ret = ''
+ if variants:
+ for v in variants.variants:
+ if (isinstance(v.type, QAPISchemaObjectType) and
+ not v.type.is_implicit()):
+ ret += gen_object(v.type.name, v.type.base,
+ v.type.local_members, v.type.variants)
+
+ ret += mcgen('''
struct %(c_name)s {
''',
- c_name=c_name(name))
+ c_name=c_name(name))
if base:
ret += mcgen('''