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ebdb0cf646
This is something that I have found to be very useful in my work and I wanted to contribute it back to the community since several people in the past have asked me for something along these lines. (Jakob, I know this has been a while coming ; )] The way you use this is you create a script that takes in as its first argument a count. The script passes into LLVM the count via a command line flag that disables a pass after LLVM has run after the pass has run for count number of times. Then the script invokes a test of some sort and indicates whether LLVM successfully compiled the test via the scripts exit status. Then you invoke bisect as follows: bisect --start=<start_num> --end=<end_num> ./script.sh "%(count)s" And bisect will continually call ./script.sh with various counts using the exit status to determine success and failure. llvm-svn: 214610
38 lines
890 B
Python
Executable File
38 lines
890 B
Python
Executable File
#!/usr/bin/env python
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import os
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import sys
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import argparse
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import subprocess
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parser = argparse.ArgumentParser()
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parser.add_argument('--start', type=int, default=0)
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parser.add_argument('--end', type=int, default=(1 << 32))
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parser.add_argument('command', nargs='+')
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args = parser.parse_args()
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start = args.start
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end = args.end
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print("Bisect Starting!")
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print("Start: %d" % start)
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print("End: %d" % end)
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last = None
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while start != end and start != end-1:
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count = start + (end - start)/2
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print("Visiting Count: %d with (Start, End) = (%d,%d)" % (count, start, end))
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cmd = [x % {'count':count} for x in args.command]
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print cmd
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result = subprocess.call(cmd)
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if result == 0:
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print(" PASSES! Setting start to count")
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start = count
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else:
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print(" FAILS! Setting end to count")
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end = count
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print("Last good count: %d" % start)
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