llvm-project
50 строк · 1.5 Кб
1#!/usr/bin/env python
2#
3# The way you use this is you create a script that takes in as its first
4# argument a count. The script passes into LLVM the count via a command
5# line flag that disables a pass after LLVM has run after the pass has
6# run for count number of times. Then the script invokes a test of some
7# sort and indicates whether LLVM successfully compiled the test via the
8# scripts exit status. Then you invoke bisect as follows:
9#
10# bisect --start=<start_num> --end=<end_num> ./script.sh "%(count)s"
11#
12# And bisect will continually call ./script.sh with various counts using
13# the exit status to determine success and failure.
14#
15from __future__ import print_function
16import os
17import sys
18import argparse
19import subprocess
20
21parser = argparse.ArgumentParser()
22
23parser.add_argument('--start', type=int, default=0)
24parser.add_argument('--end', type=int, default=(1 << 32))
25parser.add_argument('command', nargs='+')
26
27args = parser.parse_args()
28
29start = args.start
30end = args.end
31
32print("Bisect Starting!")
33print("Start: %d" % start)
34print("End: %d" % end)
35
36last = None
37while start != end and start != end-1:
38count = start + (end - start)//2
39print("Visiting Count: %d with (Start, End) = (%d,%d)" % (count, start, end))
40cmd = [x % {'count':count} for x in args.command]
41print(cmd)
42result = subprocess.call(cmd)
43if result == 0:
44print(" PASSES! Setting start to count")
45start = count
46else:
47print(" FAILS! Setting end to count")
48end = count
49
50print("Last good count: %d" % start)
51