#!/usr/bin/env python
#===- lib/fuzzer/scripts/collect_data_flow.py ------------------------------===#
#
#                     The LLVM Compiler Infrastructure
#
# This file is distributed under the University of Illinois Open Source
# License. See LICENSE.TXT for details.
#
#===------------------------------------------------------------------------===#
# Runs the data-flow tracer several times on the same input in order to collect
# the complete trace for all input bytes (running it on all bytes at once
# may fail if DFSan runs out of labels).
# Usage:
#   collect_data_flow.py BINARY INPUT [RESULT]
#===------------------------------------------------------------------------===#
import atexit
import sys
import os
import subprocess
import tempfile
import shutil

tmpdir = ""

def cleanup(d):
  print "removing: ", d
  shutil.rmtree(d)

def main(argv):
  exe = argv[1]
  inp = argv[2]
  size = os.path.getsize(inp)
  q = [[0, size]]
  tmpdir = tempfile.mkdtemp(prefix="libfuzzer-tmp-")
  atexit.register(cleanup, tmpdir)
  print "tmpdir: ", tmpdir
  outputs = []
  while len(q):
    r = q.pop()
    print "******* Trying:  ", r
    tmpfile = os.path.join(tmpdir, str(r[0]) + "-" + str(r[1]))
    ret = subprocess.call([exe, str(r[0]), str(r[1]), inp, tmpfile])
    if ret and r[1] - r[0] >= 2:
      q.append([r[0], (r[1] + r[0]) / 2])
      q.append([(r[1] + r[0]) / 2, r[1]])
    else:
      outputs.append(tmpfile)
      print "******* Success: ", r
  f = sys.stdout
  if len(argv) >= 4:
    f = open(argv[3], "w")
  merge = os.path.join(os.path.dirname(argv[0]), "merge_data_flow.py")
  subprocess.call([merge] + outputs, stdout=f)

if __name__ == '__main__':
  main(sys.argv)