v8/tools/plot-timer-events

#!/bin/sh

# find the name of the log file to process, it must not start with a dash.
log_file="v8.log"
for arg in "$@"
do
  if ! expr "X${arg}" : "^X-" > /dev/null; then
    log_file=${arg}
  fi
done

tools_path=`cd $(dirname "$0");pwd`
if [ ! "$D8_PATH" ]; then
  d8_public=`which d8`
  if [ -x "$d8_public" ]; then D8_PATH=$(dirname "$d8_public"); fi
fi
[ -n "$D8_PATH" ] || D8_PATH=$tools_path/..
d8_exec=$D8_PATH/d8

if [ ! -x "$d8_exec" ]; then
  D8_PATH=`pwd`/out/native
  d8_exec=$D8_PATH/d8
fi

if [ ! -x "$d8_exec" ]; then
  d8_exec=`grep -m 1 -o '".*/d8"' $log_file | sed 's/"//g'`
fi

if [ ! -x "$d8_exec" ]; then
  echo "d8 shell not found in $D8_PATH"
  echo "To build, execute 'make native' from the V8 directory"
  exit 1
fi

if [[ "$@" != *--distortion* ]]; then
  # Try to find out how much the instrumentation overhead is.
  calibration_log=calibration.log
  calibration_script="for (var i = 0; i < 1000000; i++) print();"

  $d8_exec --nocrankshaft --prof --logfile $calibration_log \
       --log-timer-events -e "$calibration_script" > /dev/null
  t_1_start=`grep "timer-event-start,\"V8.Execute\"" $calibration_log  \
       | tail -n1 | awk -F, '{print $3}'`
  t_1_end=`grep "timer-event-end,\"V8.Execute\"" $calibration_log  \
       | tail -n1 | awk -F, '{print $3}'`
  n_1=`grep "timer-event\|tick" $calibration_log  | wc -l`

  $d8_exec --nocrankshaft --prof --logfile $calibration_log \
       --log-internal-timer-events -e "$calibration_script" > /dev/null
  t_2_start=`grep "timer-event-start,\"V8.Execute\"" $calibration_log  \
       | tail -n1 | awk -F, '{print $3}'`
  t_2_end=`grep "timer-event-end,\"V8.Execute\"" $calibration_log  \
       | tail -n1 | awk -F, '{print $3}'`
  n_2=`grep "timer-event\|tick" $calibration_log  | wc -l`

  rm $calibration_log

  # Overhead in picoseconds.
  options=--distortion=
  options+=`echo "1000*(($t_1_end - $t_1_start) - ($t_2_end - $t_2_start)) \
              / ($n_1 - $n_2)" | bc`
  echo $options
fi

cat $log_file |
    $d8_exec $tools_path/csvparser.js $tools_path/splaytree.js \
    $tools_path/codemap.js $tools_path/profile.js $tools_path/profile_view.js \
    $tools_path/logreader.js $tools_path/tickprocessor.js \
    $tools_path/profviz/composer.js $tools_path/profviz/stdio.js \
    -- $@ $options 2>/dev/null | gnuplot > timer-events.png