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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
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3
qapi/string-input-visitor.c
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@@ -299,8 +299,7 @@ static void parse_type_number(Visitor *v, double *obj, const char *name,
*obj = val;
}
static void parse_optional(Visitor *v, bool *present, const char *name,
Error **errp)
static void parse_optional(Visitor *v, bool *present, const char *name)
{
StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);