trim-lcov.py

   1 #!/usr/bin/python
   2
   3 # This script removes branch and/or line coverage data for lines that
   4 # contain a particular substring.
   5 #
   6 # In the interest of "fairness" it removes all branch or coverage data
   7 # when a match is found -- not just negative data.  It is therefore
   8 # likely that running this script will actually reduce the total number
   9 # of lines and branches that are marked as covered (in absolute terms).
  10 #
  11 # This script intentionally avoids checking for errors.  Any exceptions
  12 # will trigger make to fail.
  13 #
  14 # Author: Ryan Lortie <desrt@desrt.ca>
  15
  16 import sys
  17
  18 line_suppress = ['g_assert_not_reached']
  19 branch_suppress = ['g_assert', 'g_return_if_fail', 'g_return_val_if_fail', 'G_DEFINE_TYPE']
  20
  21 def check_suppress(suppressions, source, data):
  22     line, _, rest = data.partition(',')
  23     line = int(line) - 1
  24
  25     assert line < len(source)
  26
  27     for suppression in suppressions:
  28         if suppression in source[line]:
  29             return True
  30
  31     return False
  32
  33 source = []
  34 for line in sys.stdin:
  35     line = line[:-1]
  36
  37     keyword, _, rest = line.partition(':')
  38
  39     # Source file
  40     if keyword == 'SF':
  41         source = file(rest).readlines()
  42
  43     # Branch coverage data
  44     elif keyword == 'BRDA':
  45         if check_suppress(branch_suppress, source, rest):
  46             continue
  47
  48     # Line coverage data
  49     elif keyword == 'DA':
  50         if check_suppress(line_suppress, source, rest):
  51             continue
  52
  53     print line