https://github.com/eklitzke/c.sh

Inline C/asm in Bash
https://github.com/eklitzke/c.sh

asm bash c dlopen popcnt x86

Last synced: about 1 month ago
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Inline C/asm in Bash

• Host: GitHub
• URL: https://github.com/eklitzke/c.sh
• Owner: eklitzke
• Created: 2016-06-17T16:52:53.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2017-08-08T19:44:28.000Z (about 7 years ago)
• Last Synced: 2024-04-04T18:37:23.006Z (6 months ago)
• Topics: asm, bash, c, dlopen, popcnt, x86
• Language: Shell
• Size: 3.91 KB
• Stars: 250
• Watchers: 10
• Forks: 13
• Open Issues: 1
• Metadata Files:
  • Readme: README.md

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README

        
# Inline C/Assembler in Bash

Have you ever wanted to combine the speed and safety of Bash with the raw,

unbridled power of C? Thanks to @taviso's wonderful

[ctypes.sh](http://ctypes.sh/) this is possible:

```bash

#!/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 <

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]+'

```

More details [on my blog](https://eklitzke.org/inline-c-and-asm-in-bash).