[Rcpp-devel] Segfaults

[Steve Lianoglou]

Woops -- seems I misdiagnosed the cause of error, please ignore :-)

Still, I'm surprised the attempted logical (NA) to Numeric conversion
isn't a source of some potential woes, too?

On Wed, Jan 4, 2012 at 9:50 AM, Steve Lianoglou
<mailinglist.honeypot at gmail.com> wrote:
> Hi,
>
> On Wed, Jan 4, 2012 at 9:33 AM, Hadley Wickham <hadley at rice.edu> wrote:
>> Hi all,
>>
>> Is it a bug to cause a segfault with Rcpp? Or are am I doing something
>> so dumb that an automatic check could never protect?  See minimal
>> reproducible example below.
>>
>> Hadley
>>
>> library(inline)
>> f <- cxxfunction(signature(x = "numeric", i = "numeric"), plugin = "Rcpp", '
>>  Rcpp::NumericVector x_(x);
>>  Rcpp::NumericVector i_(i);
>>
>>  x_[(int) (i_[0]) - 1] = 1000;
>>
>>  return(x_);
>> ')
>> f(1:10, 1) # works
>> f(1:10, 1.5) # also works
>> f(1:10, NA) # segfaults
>
> I reckon that's because `NA` is actually of `logical` type, where your
> first to examples are of the correct (real/double) type.
>
> When I use inline for anything semi-permanent (the last step before
> turning it into a package, let's say), I typically have a thin R
> wrapper function that calls down to my inline function and I never
> call the inline function directly anywhere else. The job of the thin R
> wrapper function is to sanity check and/or coerce the vars to the
> correct type before they are past to the inline'd function to avoid
> the segfault.
>
> -steve
>
>>
>> --
>> Assistant Professor / Dobelman Family Junior Chair
>> Department of Statistics / Rice University
>> http://had.co.nz/
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>
>
>
> --
> Steve Lianoglou
> Graduate Student: Computational Systems Biology
>  | Memorial Sloan-Kettering Cancer Center
>  | Weill Medical College of Cornell University
> Contact Info: http://cbio.mskcc.org/~lianos/contact



-- 
Steve Lianoglou
Graduate Student: Computational Systems Biology
 | Memorial Sloan-Kettering Cancer Center
 | Weill Medical College of Cornell University
Contact Info: http://cbio.mskcc.org/~lianos/contact