TODO: explanation
Example script:
$ cat scripts/gun-demo
e asm.profile=simple
e scr.color=0
e scr.bytewidth=16
gur
gun eip 40 pd
gun esp 128 px
gun entrypoint 128 pd
"gun esp+1 128 ad @ esp"
gue entrypoint eip
gue eip esp
gue esp
gud > a.dot
!!dot -Tpng -ograph.png a.dot
!!rsc view graph.png
guv
q