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#!/usr/bin/env python3
# Find regression tests that cover given source lines
import argparse
import os
import re
import subprocess
import sys
description =\
'''\
Find cbmc regression tests that cover given source lines
The program for which to analyse coverage needs to be built with gcc/g++/ld and
flag --coverage (or equivalent), and the gcov command needs to be available.
Example (assuming the script is invoked from the cbmc root directory):
find-covering-tests.py \\
--directory regression/cbmc \\
--command '../test.pl -c cbmc' \\
--source-line 'src/cbmc_parse_options.cpp:322' \\
--source-line 'src/goto_symex.cpp:53'
The invocation above determines the regression tests in regression/cbmc which
cover line 322 of file cbmc_parse_options.cpp or line 53 of file goto_symex.cpp.
'''
def remove_existing_coverage_data(source_lines):
source_files = [item[0] for item in source_lines]
for filename in source_files:
pre, ext = os.path.splitext(filename)
gcda_file = pre + '.gcda'
gcov_file = filename + '.gcov'
try:
os.remove(gcda_file)
os.remove(gcov_file)
except:
pass
def parse_source_lines(source_lines):
return [(item[0], int(item[1])) for item in
map(lambda s: s.split(':'), source_lines)]
def is_covered_source_line(filename, line):
if not os.path.isfile(filename):
return False
d = os.path.dirname(filename)
b = os.path.basename(filename)
subprocess.run(['gcov', b],
cwd=d, stdout=subprocess.DEVNULL,
stderr=subprocess.DEVNULL,
check=True)
gcov_file = filename + '.gcov'
if not os.path.isfile(gcov_file):
return False
f = open(gcov_file)
s = f.read()
f.close()
mo = re.search('^\s*[1-9][0-9]*:\s+' + str(line) + ':', s, re.MULTILINE)
return mo is not None
def get_covered_source_lines(source_lines):
covered_source_lines = []
for filename, line in source_lines:
if is_covered_source_line(filename, line):
covered_source_lines.append((filename, line))
return covered_source_lines
def run(config):
source_lines = parse_source_lines(config.source_line)
dirs = filter(
lambda entry: os.path.isdir(os.path.join(config.directory, entry)),
os.listdir(config.directory))
for d in dirs:
remove_existing_coverage_data(source_lines)
print('Running test ' + d)
subprocess.run([config.command + ' ' + d],
cwd=config.directory,
shell=True,
stdout=subprocess.DEVNULL,
stderr=subprocess.DEVNULL,
check=True)
covered_source_lines = get_covered_source_lines(source_lines)
if covered_source_lines:
print(' Covered source lines:')
for filename, line in covered_source_lines:
print(' ' + filename + ':' + str(line))
else:
print(' Does not cover any of the given source lines')
if __name__ == '__main__':
parser = argparse.ArgumentParser(
formatter_class=argparse.RawDescriptionHelpFormatter,
description=description)
parser.add_argument(
'--source-line',
action='append',
metavar='<filename>:<line>',
required=True,
help='source lines for which to determine which tests cover them, can be '
'repeated')
parser.add_argument('--command', required=True,
help='regression test command, typically an invocation of test.pl')
parser.add_argument('--directory', required=True,
help='directory containing regression test directories')
config = parser.parse_args()
run(config)
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