From 15c2f669e3fb2bc97f7b42d1871f595c0ac24af8 Mon Sep 17 00:00:00 2001 From: Eric Blake Date: Thu, 28 Apr 2016 15:45:27 -0600 Subject: qapi: Split visit_end_struct() into pieces As mentioned in previous patches, we want to call visit_end_struct() functions unconditionally, so that visitors can release resources tied up since the matching visit_start_struct() without also having to worry about error priority if more than one error occurs. Even though error_propagate() can be safely used to ignore a second error during cleanup caused by a first error, it is simpler if the cleanup cannot set an error. So, split out the error checking portion (basically, input visitors checking for unvisited keys) into a new function visit_check_struct(), which can be safely skipped if any earlier errors are encountered, and leave the cleanup portion (which never fails, but must be called unconditionally if visit_start_struct() succeeded) in visit_end_struct(). Generated code in qapi-visit.c has diffs resembling: |@@ -59,10 +59,12 @@ void visit_type_ACPIOSTInfo(Visitor *v, | goto out_obj; | } | visit_type_ACPIOSTInfo_members(v, obj, &err); |- error_propagate(errp, err); |- err = NULL; |+ if (err) { |+ goto out_obj; |+ } |+ visit_check_struct(v, &err); | out_obj: |- visit_end_struct(v, &err); |+ visit_end_struct(v); | out: and in qapi-event.c: @@ -47,7 +47,10 @@ void qapi_event_send_acpi_device_ost(ACP | goto out; | } | visit_type_q_obj_ACPI_DEVICE_OST_arg_members(v, ¶m, &err); |- visit_end_struct(v, err ? NULL : &err); |+ if (!err) { |+ visit_check_struct(v, &err); |+ } |+ visit_end_struct(v); | if (err) { | goto out; Signed-off-by: Eric Blake Message-Id: <1461879932-9020-20-git-send-email-eblake@redhat.com> [Conflict with a doc fixup resolved] Signed-off-by: Markus Armbruster --- scripts/qapi-event.py | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'scripts/qapi-event.py') diff --git a/scripts/qapi-event.py b/scripts/qapi-event.py index 9b5c5b5..21fb167 100644 --- a/scripts/qapi-event.py +++ b/scripts/qapi-event.py @@ -98,7 +98,10 @@ def gen_event_send(name, arg_type): goto out; } visit_type_%(c_name)s_members(v, ¶m, &err); - visit_end_struct(v, err ? NULL : &err); + if (!err) { + visit_check_struct(v, &err); + } + visit_end_struct(v); if (err) { goto out; } -- cgit v1.1