I think you need to PROTECT the vector you're putting in the slot as
well as the overall object. At any rate, the problem goes away for me
with the revised version of dummy.c below. (Empirically, PROTECT'ing
the class definition didn't seem to be needed, but experience suggests
that too much protection is better than too little.)
#include <Rdefines.h>
SEXP foo() {
SEXP ans, cl, el;
PROTECT(cl = MAKE_CLASS("test"));
PROTECT(ans = NEW_OBJECT(cl));
PROTECT(el = allocVector(LGLSXP, 1));
SET_SLOT(ans, install("lgl"), el);
LOGICAL(GET_SLOT(ans, install("lgl")))[0] = TRUE;
UNPROTECT(3);
return(ans);
}
Torsten Hothorn wrote:>
> Hi,
>
> the following example aiming at a class containing a logical slot
> segfaults under R-1.9.0 when `gctorture(on = TRUE)' is used:
>
> Code code (dummy.c):
>
> #include <Rdefines.h>
>
> SEXP foo() {
>
> SEXP ans;
>
> PROTECT(ans = NEW_OBJECT(MAKE_CLASS("test")));
> SET_SLOT(ans, install("lgl"), allocVector(LGLSXP, 1));
> LOGICAL(GET_SLOT(ans, install("lgl")))[0] = TRUE;
> UNPROTECT(1);
> return(ans);
> }
>
> R code (dummy.R):
>
> dyn.load("dummy.so")
>
> setClass("test", representation = representation(lgl =
"logical"))
>
> a = .Call("foo")
> a # OK
>
> gctorture(on = TRUE)
> a = .Call("foo")
> gctorture(on = FALSE)
> a # segfault
>
> which gives
>
> R>
> R>
> R> dyn.load("dummy.so")
> R>
> R> setClass("test", representation = representation(lgl =
"logical"))
> [1] "test"
> R>
> R> a = .Call("foo")
> R> a
> An object of class "test"
> Slot "lgl":
> [1] TRUE
>
> R>
> R> gctorture(on = TRUE)
> R> a = .Call("foo")
> R> gctorture(on = FALSE)
> Segmentation fault
>
> Best,
>
> Torsten
>
> R> version
> _
> platform i686-pc-linux-gnu
> arch i686
> os linux-gnu
> system i686, linux-gnu
> status
> major 1
> minor 9.0
> year 2004
> month 04
> day 12
> language R
> R>
>
> _______________________________________________________________________
> | |
> | Dr. rer. nat. Torsten Hothorn |
> | Institut fuer Medizininformatik, Biometrie und Epidemiologie |
> | Waldstrasse 6, D-91054 Erlangen, Deutschland |
> | Tel: ++49-9131-85-22707 (dienstl.) |
> | Fax: ++49-9131-85-25740 |
> | Email: Torsten.Hothorn@rzmail.uni-erlangen.de |
> | PLEASE send emails cc to torsten@hothorn.de |
> | Web: http://www.imbe.med.uni-erlangen.de/~hothorn |
> |_______________________________________________________________________|
>
> ______________________________________________
> R-devel@stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-devel
--
John M. Chambers jmc@bell-labs.com
Bell Labs, Lucent Technologies office: (908)582-2681
700 Mountain Avenue, Room 2C-282 fax: (908)582-3340
Murray Hill, NJ 07974 web: http://www.cs.bell-labs.com/~jmc