Here is my favorite typical way of decompiling perl.
use Devel::Size qw(size total_size);
my $deparse = B::Deparse->new();
print "\n\n".size(\&Win32::LoadLibrary )."\n\n";
my $walker = B::Concise::compile('-src','-exec',*Win32::LoadLibrary);
*Win32::LoadLibrary is XS code
SV = IV(0xcbaf78) at 0xcbaf7c
REFCNT = 1
FLAGS = (TEMP,ROK)
RV = 0xc45b3c
SV = PVCV(0xc12a3c) at 0xc45b3c
REFCNT = 2
FLAGS = ()
COMP_STASH = 0x0
XSUB = 0x3a2528
XSUBANY = 3
GVGV::GV = 0xc45b2c "Win32" :: "LoadLibrary"
FILE = "Win32.xs"
DEPTH = 0
FLAGS = 0x800
OUTSIDE_SEQ = 0
PADLIST = 0x0
OUTSIDE = 0x0 (null)
Deparse can't decompile C for you. Only pure perl functions. Try Ollydbg (shareware) or pay for Ida Pro if you need to decompile machine code.
update: WSD::Filter is a proprietary not-FOSS XS module with a EULA for an Apache webserver. To OP, either buy the license, or buy Ida Pro, or both (if you want to make sure your binary blob isn't a rootkit).
update: since you use linux, I strongly suggest not investing in a copy of Ida Pro since Ida Pro only understands MS symbol files, not GCC symbol data.