mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 03:33:20 +01:00
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
|
|
|
|
import os
|
|
import sys
|
|
import argparse
|
|
import subprocess
|
|
|
|
parser = argparse.ArgumentParser()
|
|
|
|
parser.add_argument('--start', type=int, default=0)
|
|
parser.add_argument('--end', type=int, default=(1 << 32))
|
|
parser.add_argument('command', nargs='+')
|
|
|
|
args = parser.parse_args()
|
|
|
|
start = args.start
|
|
end = args.end
|
|
|
|
print("Bisect Starting!")
|
|
print("Start: %d" % start)
|
|
print("End: %d" % end)
|
|
|
|
last = None
|
|
while start != end and start != end-1:
|
|
count = start + (end - start)/2
|
|
print("Visiting Count: %d with (Start, End) = (%d,%d)" % (count, start, end))
|
|
cmd = [x % {'count':count} for x in args.command]
|
|
print cmd
|
|
result = subprocess.call(cmd)
|
|
if result == 0:
|
|
print(" PASSES! Setting start to count")
|
|
start = count
|
|
else:
|
|
print(" FAILS! Setting end to count")
|
|
end = count
|
|
|
|
print("Last good count: %d" % start)
|