1 #!/usr/bin/env python 2 3 import os 4 import sys 5 import argparse 6 import subprocess 7 8 parser = argparse.ArgumentParser() 9 10 parser.add_argument('--start', type=int, default=0) 11 parser.add_argument('--end', type=int, default=(1 << 32)) 12 parser.add_argument('--optcmd', default=("opt")) 13 parser.add_argument('--filecheckcmd', default=("FileCheck")) 14 parser.add_argument('--prefix', default=("CHECK-BISECT")) 15 parser.add_argument('--test', default=("")) 16 17 args = parser.parse_args() 18 19 start = args.start 20 end = args.end 21 22 opt_command = [args.optcmd, "-O2", "-opt-bisect-limit=%(count)s", "-S", args.test] 23 check_command = [args.filecheckcmd, args.test, "--check-prefix=%s" % args.prefix] 24 last = None 25 while start != end and start != end-1: 26 count = int(round(start + (end - start)/2)) 27 cmd = [x % {'count':count} for x in opt_command] 28 print("opt: " + str(cmd)) 29 opt_result = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE) 30 filecheck_result = subprocess.Popen(check_command, stdin=opt_result.stdout) 31 opt_result.stdout.close() 32 opt_result.stderr.close() 33 filecheck_result.wait() 34 if filecheck_result.returncode == 0: 35 start = count 36 else: 37 end = count 38 39 print("Last good count: %d" % start) 40
