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150
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1 #!/usr/bin/env python
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2 #
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3 # The way you use this is you create a script that takes in as its first
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4 # argument a count. The script passes into LLVM the count via a command
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5 # line flag that disables a pass after LLVM has run after the pass has
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6 # run for count number of times. Then the script invokes a test of some
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7 # sort and indicates whether LLVM successfully compiled the test via the
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8 # scripts exit status. Then you invoke bisect as follows:
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9 #
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10 # bisect --start=<start_num> --end=<end_num> ./script.sh "%(count)s"
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11 #
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12 # And bisect will continually call ./script.sh with various counts using
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13 # the exit status to determine success and failure.
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14 #
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15 from __future__ import print_function
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16 import os
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17 import sys
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18 import argparse
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19 import subprocess
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20
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21 parser = argparse.ArgumentParser()
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22
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23 parser.add_argument('--start', type=int, default=0)
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24 parser.add_argument('--end', type=int, default=(1 << 32))
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25 parser.add_argument('command', nargs='+')
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26
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27 args = parser.parse_args()
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28
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29 start = args.start
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30 end = args.end
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31
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32 print("Bisect Starting!")
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33 print("Start: %d" % start)
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34 print("End: %d" % end)
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35
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36 last = None
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37 while start != end and start != end-1:
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38 count = start + (end - start)//2
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39 print("Visiting Count: %d with (Start, End) = (%d,%d)" % (count, start, end))
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40 cmd = [x % {'count':count} for x in args.command]
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41 print(cmd)
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42 result = subprocess.call(cmd)
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43 if result == 0:
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44 print(" PASSES! Setting start to count")
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45 start = count
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46 else:
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47 print(" FAILS! Setting end to count")
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48 end = count
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49
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50 print("Last good count: %d" % start)
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