in reply to simple XS

I'm not surprised you get a segfault. I'm surprised you don't get a compiler warning. Isn't this a big problem?

int get(self,index)
    SV* self
    int index

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A Perl integer is also an SV with the IV flag set. Unless you (somehow) have a typemap set up to convert your SvIV to a C integer, I think you're letting C coerce the address of the pointer to an integer and trying to use that as the array index. That's a one-way ticket to segfault town.

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Re^2: simple XS
by ikegami (Patriarch) on Mar 01, 2010 at 12:37 UTC

    The typemap handles it. 

    #!/usr/bin/perl

use Inline C => <<'EOC';

void show(int index) {
    PerlIO_printf(PerlIO_stdout(), "%d\n", index);
}

EOC

show(123456);

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    123456

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      Thanks for confirming. Clearly I need better typemaps!

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