From: Per Bothner <per@bothner.com>
To: Panicz Maciej Godek <godek.maciek@gmail.com>
Cc: kawa@sourceware.org
Subject: Re: A protected slot is not accessible in a subclass
Date: Fri, 25 Mar 2022 11:46:29 -0700 [thread overview]
Message-ID: <8a9b979c-e33d-7e38-9f4c-039092d8169b@bothner.com> (raw)
In-Reply-To: <CAMFYt2Zu7tFhR0HHe5psRGGREH63VPkLN4HFb59R1wOFWFXtAw@mail.gmail.com>
On 3/25/22 02:59, Panicz Maciej Godek wrote:
> I tried this:
> (define-simple-class S (gnu.mapping.Symbol)
> ((*init*)
> (invoke-special gnu.mapping.Symbol (this) '*init* (("foo":toString):intern) gnu.mapping.Namespace:EmptyNamespace)
> (set! (field (this) 'name) (("bar":toString):intern))))
> but it gives a similar error:
> java.lang.RuntimeException: no such field name in S
> at gnu.kawa.reflect.SlotSet.apply(SlotSet.java:115) at gnu.kawa.reflect.SlotSet.apply3(SlotSet.java:120)
> at S.<init>(tty:14)
This fails because the (set! (field ...) ...) isn't inlined, so we end up using
run-time reflection. This is a missing Kawa optimization.
Using set-field! instead does work:
(set-field! (this) 'name (("bar":toString):intern))
Note in this case you need to add:
(import (kawa reflect)) ; for set-field!
I checked in a fix so either of these now work:
(set! (this):name (("bar":toString):intern))
(set! name (("bar":toString):intern))
--
--Per Bothner
per@bothner.com http://per.bothner.com/
next prev parent reply other threads:[~2022-03-25 18:46 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-24 22:14 Panicz Maciej Godek
2022-03-25 4:56 ` Per Bothner
2022-03-25 9:59 ` Panicz Maciej Godek
2022-03-25 18:46 ` Per Bothner [this message]
2022-03-25 20:53 ` Panicz Maciej Godek
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