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authorMarkus Armbruster <armbru@redhat.com>2015-06-26 10:19:11 +0200
committerMarkus Armbruster <armbru@redhat.com>2015-09-04 15:47:13 +0200
commit8c3f8e77215bfedb7854221868f655e148506936 (patch)
treec49d6c7672d25980dec64b31e2aebe9aa8d8f154 /scripts
parent1e6c1616a91cdcbe9a8387541f7689b8c11632aa (diff)
downloadhqemu-8c3f8e77215bfedb7854221868f655e148506936.zip
hqemu-8c3f8e77215bfedb7854221868f655e148506936.tar.gz
qapi-visit: Fix generated code when schema has forward refs
The visit_type_implicit_FOO() are generated on demand, right before their first use. Used by visit_type_STRUCT_fields() when STRUCT has base FOO, and by visit_type_UNION() when flat UNION has member a FOO. If the schema defines FOO after its first use as struct base or flat union member, visit_type_implicit_FOO() calls visit_type_implicit_FOO() before its definition, which doesn't compile. Rearrange qapi-schema-test.json to demonstrate the bug. Fix by generating the necessary forward declaration. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'scripts')
-rw-r--r--scripts/qapi-visit.py15
1 files changed, 14 insertions, 1 deletions
diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py
index 4ec79a6..b3a308f 100644
--- a/scripts/qapi-visit.py
+++ b/scripts/qapi-visit.py
@@ -17,13 +17,23 @@ from qapi import *
import re
implicit_structs = []
+struct_fields_seen = set()
def generate_visit_implicit_struct(type):
global implicit_structs
if type in implicit_structs:
return ''
implicit_structs.append(type)
- return mcgen('''
+ ret = ''
+ if type not in struct_fields_seen:
+ # Need a forward declaration
+ ret += mcgen('''
+
+static void visit_type_%(c_type)s_fields(Visitor *m, %(c_type)s **obj, Error **errp);
+''',
+ c_type=type_name(type))
+
+ ret += mcgen('''
static void visit_type_implicit_%(c_type)s(Visitor *m, %(c_type)s **obj, Error **errp)
{
@@ -38,8 +48,11 @@ static void visit_type_implicit_%(c_type)s(Visitor *m, %(c_type)s **obj, Error *
}
''',
c_type=type_name(type))
+ return ret
def generate_visit_struct_fields(name, members, base = None):
+ struct_fields_seen.add(name)
+
ret = ''
if base:
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