#!/bin/bash



# where ctypes.sh is installed; you will likely have to change this

LD_LIBRARY_PATH=$HOME/local/lib

. ~/code/ctypes.sh/ctypes.sh



# compile stdin to a DSO

function build {

    cfile=$(mktemp /tmp/XXXXXX.c)

    sofile=$(mktemp /tmp/XXXXXX.so)

    while read line; do

        echo $line>>$cfile

    done

    cc -fPIC -shared $cfile -o $sofile

    rm -f $cfile

    echo $sofile

}



# our code

sofile=$(build <<EOF

#include <stdio.h>



void hello_world(void) {

  puts("hello world");

}



int popcnt(int num) {

  int out;

  __asm__("popcnt %1, %0"

          :"=r"(out)

          :"r"(num)

          :"0"

         );

  return out;

}

EOF

)



# clean up when we're done

trap "rm -f $sofile" EXIT



# load the code

dlopen $sofile



# print hello world

dlcall hello_world



# get the popcnt of 5

dlcall -r int -n out popcnt 5

echo $out | egrep -o '[0-9]+'