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qapi: Track all failures between visit_start/stop

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Inside the generated code between visit_start_struct() and
visit_end_struct(), we were blindly setting the error into
the caller's errp parameter. But a future patch to split
visit_end_struct() will require that we take action based
on whether an error has occurred, which requires us to track
all actions through a local err. Rewrite the visits to be
more in line with the other generated calls.

Generated code changes look like:

| visit_start_struct(v, (void **)obj, "Abort", name, sizeof(Abort), &err);
|- if (!err) {
|- if (*obj) {
|- visit_type_Abort_fields(v, obj, errp);
|- }
|- visit_end_struct(v, &err);
|+ if (err) {
|+ goto out;
| }
|+ if (!*obj) {
|+ goto out_obj;
|+ }
|+ visit_type_Abort_fields(v, obj, &err);
|+ error_propagate(errp, err);
|+ err = NULL;
|+out_obj:
|+ visit_end_struct(v, &err);
|+out:
| error_propagate(errp, err);
| }

Backports commit 92b09babc11b60458c28cfe37eaa314de50e6241 from qemu
This commit is contained in:
Eric Blake 2018-02-19 22:19:29 -05:00 committed by Lioncash
parent 4f513b2070
commit 264748ad06
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 12 additions and 6 deletions
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18
qemu/scripts/qapi-visit.py
View file

@ -2,7 +2,7 @@
# QAPI visitor generator
#
# Copyright IBM, Corp. 2011
# Copyright (C) 2014-2015 Red Hat, Inc.
# Copyright (C) 2014-2016 Red Hat, Inc.
#
# Authors:
# Anthony Liguori <aliguori@us.ibm.com>
@ -121,12 +121,18 @@ void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error
visit_start_struct(v, (void **)obj, "%(name)s", name, sizeof(%(c_name)s), &err);
if (!err) {
if (*obj) {
visit_type_%(c_name)s_fields(v, obj, errp);
}
visit_end_struct(v, &err);
if (err) {
goto out;
}
if (!*obj) {
goto out_obj;
}
visit_type_%(c_name)s_fields(v, obj, &err);
error_propagate(errp, err);
err = NULL;
out_obj:
visit_end_struct(v, &err);
out:
error_propagate(errp, err);
}
''',