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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.

Backports commit d02cf37766ba3cf918d7085aa7848c9dc05fd11a from qemu
This commit is contained in:
Eric Blake 2018-02-19 19:10:56 -05:00 committed by Lioncash
parent 1f11f92a80
commit 61e59c4c62
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 15 additions and 6 deletions
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21
qemu/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()
def gen_visit_decl(name, scalar=False):
@ -28,19 +33,23 @@ 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('''