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qapi-visit: Split off visit_type_FOO_fields forward decl

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We generate a static visit_type_FOO_fields() for every type
FOO.  However, sometimes we need a forward declaration. Split
the code to generate the forward declaration out of
gen_visit_implicit_struct() into a new gen_visit_fields_decl(),
and also prepare for a forward declaration to be emitted
during gen_visit_struct(), so that a future patch can switch
from using visit_type_FOO_implicit() to the simpler
visit_type_FOO_fields() as part of unboxing the base class
of a struct.

No change to generated code.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1445898903-12082-8-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Eric Blake 2015-10-26 16:34:46 -06:00 committed by Markus Armbruster
parent 98481bfcd6
commit d02cf37766
1 changed files with 16 additions and 6 deletions
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22
scripts/qapi-visit.py
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@ -15,7 +15,12 @@
from qapi import *
import re
# visit_type_FOO_implicit() is emitted as needed; track if it has already
# been output.
implicit_structs_seen = set()
# visit_type_FOO_fields() is always emitted; track if a forward declaration
# or implementation has already been output.
struct_fields_seen = set()
@ -29,19 +34,24 @@ void visit_type_%(c_name)s(Visitor *v, %(c_type)sobj, const char *name, Error **
c_name=c_name(name), c_type=c_type)
def gen_visit_implicit_struct(typ):
if typ in implicit_structs_seen:
return ''
implicit_structs_seen.add(typ)
def gen_visit_fields_decl(typ):
ret = ''
if typ.name not in struct_fields_seen:
# Need a forward declaration
ret += mcgen('''
static void visit_type_%(c_type)s_fields(Visitor *v, %(c_type)s **obj, Error **errp);
''',
c_type=typ.c_name())
struct_fields_seen.add(typ.name)
return ret
def gen_visit_implicit_struct(typ):
if typ in implicit_structs_seen:
return ''
implicit_structs_seen.add(typ)
ret = gen_visit_fields_decl(typ)
ret += mcgen('''