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qapi: Shorter visits of optional fields 

For less code, reflect the determined boolean value of an optional
visit back to the caller instead of making the caller read the
boolean after the fact.

The resulting generated code has the following diff:

|-    visit_optional(v, &has_fdset_id, "fdset-id");
|-    if (has_fdset_id) {
|+    if (visit_optional(v, &has_fdset_id, "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: <1449033659-25497-10-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Eric Blake 2015-12-01 22:20:53 -07:00 committed by Markus Armbruster
parent 5cdc8831a7
commit 29637a6ee9
3 changed files with 5 additions and 5 deletions
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4
include/qapi/visitor.h
View File

@ -41,9 +41,9 @@ void visit_end_list(Visitor *v, Error **errp);
* Check if an optional member @name of an object needs visiting.
* For input visitors, set *@present according to whether the
* corresponding visit_type_*() needs calling; for other visitors,
* leave *@present unchanged.
* leave *@present unchanged. Return *@present for convenience.
*/
void visit_optional(Visitor *v, bool *present, const char *name);
bool visit_optional(Visitor *v, bool *present, const char *name);
/**
* Determine the qtype of the item @name in the current object visit.

3
qapi/qapi-visit-core.c
View File

@ -73,11 +73,12 @@ void visit_end_union(Visitor *v, bool data_present, Error **errp)
}
}
void visit_optional(Visitor *v, bool *present, const char *name)
bool visit_optional(Visitor *v, bool *present, const char *name)
{
if (v->optional) {
v->optional(v, present, name);
}
return *present;
}
void visit_get_next_type(Visitor *v, QType *type, bool promote_int,

3
scripts/qapi.py
View File

@ -1656,8 +1656,7 @@ 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");
if (%(prefix)shas_%(c_name)s) {
if (visit_optional(v, &%(prefix)shas_%(c_name)s, "%(name)s")) {
''',
prefix=prefix, c_name=c_name(memb.name),
name=memb.name, errp=errparg)