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qapi: Simplify visits of optional fields

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None of the visitor callbacks would set an error when testing
if an optional field was present; make this part of the interface
contract by eliminating the errp argument.

The resulting generated code has a nice diff:

|-    visit_optional(v, &has_fdset_id, "fdset-id", &err);
|-    if (err) {
|-        goto out;
|-    }
|+    visit_optional(v, &has_fdset_id, "fdset-id");
|     if (has_fdset_id) {
|         visit_type_int(v, &fdset_id, "fdset-id", &err);
|         if (err) {
|             goto out;
|         }
|     }

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1449033659-25497-9-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Eric Blake 2015-12-01 22:20:52 -07:00 • committed by Markus Armbruster
parent d00341af38
commit 5cdc8831a7
7 changed files with 17 additions and 19 deletions
Download patch file Download diff file Expand all files Collapse all files

8
scripts/qapi.py
View file

@ -1656,15 +1656,11 @@ def gen_visit_fields(members, prefix='', need_cast=False, skiperr=False):
for memb in members:
if memb.optional:
ret += mcgen('''
visit_optional(v, &%(prefix)shas_%(c_name)s, "%(name)s", %(errp)s);
visit_optional(v, &%(prefix)shas_%(c_name)s, "%(name)s");
if (%(prefix)shas_%(c_name)s) {
''',
prefix=prefix, c_name=c_name(memb.name),
name=memb.name, errp=errparg)
ret += gen_err_check(skiperr=skiperr)
ret += mcgen('''
if (%(prefix)shas_%(c_name)s) {
''',
prefix=prefix, c_name=c_name(memb.name))
push_indent()
# Ugly: sometimes we need to cast away const