#! /bin/sh


# This little script tries to formulate a series of "perf probe"
# commands that touch the same probe locations as the stap script
# would.  This can be used to check stap's "alibi" against
# kprobes/uprobes malfunctions.
#
# This is an imperfect mapping, requiring manual checking.
#
# Usage:

#  (stap -l PATTERN [-c COMMAND]; ...) | stap2perf | sh
#  (stap -p2 -e SCRIPT [-c COMMAND]; ...) | stap2perf | sh
#  perf list | grep probe
#  perf record -e 'probe*:*' COMMAND
#  perf report
#  perf probe -d 'probe*:*'


function param1() {
    # fish out the first literal-string parameter
    echo "$1" | cut -f2 -d'"' | cut -f1 -d@ | cut -f1 -d'<'
}

function param2() {
    # fish out the second literal-string parameter
    echo "$1" | cut -f4 -d'"' | cut -f1 -d@ | cut -f1 -d'<'
}


while read pp; do
    case "$pp" in
        kernel.function*)
            fn=`param1 "$pp"`
            nr=`expr "$pp" : '.*\.return.*'`
            if [ $nr -eq 0 ]; then
                echo perf probe -a "kernel_$fn"
            else
                echo perf probe -a "kernel_${fn}_return=${fn}%return"
            fi
            ;;

        process*function*)
            proc=`param1 "$pp"`
            procbn=`basename $proc`
            fn=`param2 "$pp"`
            nr=`expr "$pp" : '.*\.return.*'`
            if [ $nr -eq 0 ]; then
                echo perf probe -x "$proc"-a "${procbn}_${fn}=$fn"
            else
                echo perf probe -x "$proc"-a "${procbn}_${fn}_return=${fn}%return"
            fi
            ;;
    esac
done | sort | uniq

echo
echo
echo perf list "|" grep probe