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qapi: Make all visitors supply uint64 callbacks

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Our qapi visitor contract supports multiple integer visitors,
but left the type_uint64 visitor as optional (falling back on
type_int64); which in turn can lead to awkward behavior with
numbers larger than INT64_MAX (the user has to be aware of
twos complement, and deal with negatives).

This patch does not address the disparity in handling large
values as negatives. It merely moves the fallback from uint64
to int64 from the visitor core to the visitors, where the issue
can actually be fixed, by implementing the missing type_uint64()
callbacks on top of the respective type_int64() callbacks, and
with a FIXME comment explaining why that's wrong.

With that done, we now have a type_uint64() callback in every
driver, so we can make it mandatory from the core. And although
the type_int64() callback can cover the entire valid range of
type_uint{8,16,32} on valid user input, using type_uint64() to
avoid mixed signedness makes more sense.

Backports commit f755dea79dc81b0d6a8f6414e0672e165e28d8ba from qemu
This commit is contained in:
Eric Blake 2018-02-19 11:57:56 -05:00 • committed by Lioncash
parent 5b5299bdee
commit eeffd97458
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GPG key ID: 4E3C3CC1031BA9C7
6 changed files with 64 additions and 28 deletions
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15
qemu/qapi/string-input-visitor.c
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@ -227,6 +227,20 @@ error:
"an int64 value or range");
}
static void parse_type_uint64(Visitor *v, uint64_t *obj, const char *name,
Error **errp)
{
/* FIXME: parse_type_int64 mishandles values over INT64_MAX */
int64_t i;
Error *err = NULL;
parse_type_int64(v, &i, name, &err);
if (err) {
error_propagate(errp, err);
} else {
*obj = i;
}
}
static void parse_type_bool(Visitor *v, bool *obj, const char *name,
Error **errp)
{
@ -316,6 +330,7 @@ StringInputVisitor *string_input_visitor_new(const char *str)
v->visitor.type_enum = input_type_enum;
v->visitor.type_int64 = parse_type_int64;
v->visitor.type_uint64 = parse_type_uint64;
v->visitor.type_size = NULL;
v->visitor.type_bool = parse_type_bool;
v->visitor.type_str = parse_type_str;