329 lines
8.5 KiB
Python
Executable File
329 lines
8.5 KiB
Python
Executable File
#!/usr/bin/env python
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import subprocess
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import sys
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import time
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if sys.version_info[0] < 3:
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class TimeoutExpired(Exception):
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pass
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else:
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TimeoutExpired = subprocess.TimeoutExpired
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def communicate(p, timeout=None, **kwargs):
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if sys.version_info[0] < 3:
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return p.communicate(**kwargs)
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else:
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return p.communicate(timeout=timeout)
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# TODO: add --hang option to detect code which impacts the analysis time
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def show_syntax():
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print('Syntax:')
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print(' reduce.py --cmd=<full command> --expected=<expected text output> --file=<source file> [--segfault]')
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print('')
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print("Example. source file = foo/bar.c")
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print(" reduce.py --cmd='./cppcheck --enable=style foo/bar.c' --expected=\"Variable 'x' is reassigned\" --file=foo/bar.c")
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sys.exit(1)
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if len(sys.argv) == 1:
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show_syntax()
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CMD = None
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EXPECTED = None
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SEGFAULT = False
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FILE = None
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ORGFILE = None
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BACKUPFILE = None
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TIMEOUTFILE = None
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for arg in sys.argv[1:]:
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if arg.startswith('--cmd='):
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CMD = arg[arg.find('=') + 1:]
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elif arg.startswith('--expected='):
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EXPECTED = arg[arg.find('=') + 1:]
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elif arg.startswith('--file='):
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FILE = arg[arg.find('=') + 1:]
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ORGFILE = FILE + '.org'
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BACKUPFILE = FILE + '.bak'
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TIMEOUTFILE = FILE + '.timeout'
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elif arg == '--segfault':
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SEGFAULT = True
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if CMD is None:
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print('Abort: No --cmd')
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show_syntax()
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if not SEGFAULT and EXPECTED is None:
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print('Abort: No --expected')
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show_syntax()
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# need to add '--error-exitcode=0' so detected issues will not be interpreted as a crash
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if SEGFAULT and not '--error-exitcode=0' in CMD:
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print("Adding '--error-exitcode=0' to --cmd")
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CMD = CMD + ' --error-exitcode=0'
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if FILE is None:
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print('Abort: No --file')
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show_syntax()
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print('CMD=' + CMD)
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if SEGFAULT:
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print('EXPECTED=SEGFAULT')
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else:
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print('EXPECTED=' + EXPECTED)
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print('FILE=' + FILE)
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def runtool(filedata=None):
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timeout = None
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if elapsed_time:
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timeout = elapsed_time * 2
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p = subprocess.Popen(CMD.split(), stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)
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try:
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comm = communicate(p, timeout=timeout)
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except TimeoutExpired:
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print('timeout')
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p.kill()
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p.communicate()
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if filedata:
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writefile(TIMEOUTFILE, filedata)
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return False
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#print(p.returncode)
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#print(comm)
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if SEGFAULT:
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if p.returncode != 0:
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return True
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elif p.returncode == 0:
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out = comm[0] + '\n' + comm[1]
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if EXPECTED in out:
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return True
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else:
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# Something could be wrong, for example the command line for Cppcheck (CMD).
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# Print the output to give a hint how to fix it.
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print('Error: {}\n{}'.format(comm[0], comm[1]))
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return False
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def writefile(filename, filedata):
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f = open(filename, 'wt')
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for line in filedata:
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f.write(line)
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f.close()
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def replaceandrun(what, filedata, i, line):
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print(what + ' ' + str(i + 1) + '/' + str(len(filedata)) + '..')
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bak = filedata[i]
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filedata[i] = line
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writefile(FILE, filedata)
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if runtool(filedata):
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print('pass')
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writefile(BACKUPFILE, filedata)
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return True
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print('fail')
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filedata[i] = bak
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return False
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def replaceandrun2(what, filedata, i, line1, line2):
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print(what + ' ' + str(i + 1) + '/' + str(len(filedata)) + '..')
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bak1 = filedata[i]
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bak2 = filedata[i + 1]
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filedata[i] = line1
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filedata[i + 1] = line2
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writefile(FILE, filedata)
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if runtool(filedata):
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print('pass')
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writefile(BACKUPFILE, filedata)
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else:
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print('fail')
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filedata[i] = bak1
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filedata[i + 1] = bak2
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def clearandrun(what, filedata, i1, i2):
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print(what + ' ' + str(i1 + 1) + '/' + str(len(filedata)) + '..')
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filedata2 = list(filedata)
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i = i1
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while i <= i2 and i < len(filedata2):
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filedata2[i] = ''
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i = i + 1
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writefile(FILE, filedata2)
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if runtool(filedata2):
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print('pass')
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writefile(BACKUPFILE, filedata2)
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return filedata2
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print('fail')
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return filedata
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def removecomments(filedata):
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for i in range(len(filedata)):
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line = filedata[i]
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if '//' in line:
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replaceandrun('remove comment', filedata, i, line[:line.find('//')].rstrip() + '\n')
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def checkpar(line):
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par = 0
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for c in line:
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if c == '(' or c == '[':
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par = par + 1
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elif c == ')' or c == ']':
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par = par - 1
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if par < 0:
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return False
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return par == 0
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def combinelines(filedata):
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if len(filedata) < 3:
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return
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lines = []
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for i in range(len(filedata) - 1):
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fd1 = filedata[i].rstrip()
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if fd1.endswith(','):
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fd2 = filedata[i + 1].lstrip()
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if fd2 != '':
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lines.append(i)
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chunksize = len(lines)
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while chunksize > 10:
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i = 0
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while i < len(lines):
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i1 = i
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i2 = i + chunksize
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i = i2
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if i2 > len(lines):
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i2 = len(lines)
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filedata2 = list(filedata)
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for line in lines[i1:i2]:
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filedata2[line] = filedata2[line].rstrip() + filedata2[line + 1].lstrip()
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filedata2[line + 1] = ''
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if replaceandrun('combine lines', filedata2, lines[i1] + 1, ''):
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filedata = filedata2
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lines[i1:i2] = []
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i = i1
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chunksize = chunksize / 2
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for line in lines:
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fd1 = filedata[line].rstrip()
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fd2 = filedata[line + 1].lstrip()
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replaceandrun2('combine lines', filedata, line, fd1 + fd2, '')
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def removedirectives(filedata):
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for i in range(len(filedata)):
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line = filedata[i].lstrip()
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if line.startswith('#'):
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# these cannot be removed on their own so skip them
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if line.startswith('#if') or line.startswith('#endif') or line.startswith('#el'):
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continue
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replaceandrun('remove preprocessor directive', filedata, i, '')
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def removeblocks(filedata):
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if len(filedata) < 3:
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return filedata
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for i in range(len(filedata)):
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strippedline = filedata[i].strip()
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if len(strippedline) == 0:
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continue
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if strippedline[-1] not in ';{}':
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continue
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i1 = i + 1
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while i1 < len(filedata) and filedata[i1].startswith('#'):
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i1 = i1 + 1
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i2 = i1
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indent = 0
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while i2 < len(filedata):
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for c in filedata[i2]:
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if c == '}':
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indent = indent - 1
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if indent == 0:
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indent = -100
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elif c == '{':
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indent = indent + 1
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if indent < 0:
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break
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i2 = i2 + 1
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if indent == -100:
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indent = 0
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if i2 == i1 or i2 >= len(filedata):
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continue
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if filedata[i2].strip() != '}' and filedata[i2].strip() != '};':
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continue
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if indent < 0:
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i2 = i2 - 1
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filedata = clearandrun('remove codeblock', filedata, i1, i2)
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return filedata
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def removeline(filedata):
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stmt = True
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for i in range(len(filedata)):
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line = filedata[i]
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strippedline = line.strip()
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if len(strippedline) == 0:
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continue
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if stmt and strippedline[-1] == ';' and checkpar(line) and '{' not in line and '}' not in line:
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replaceandrun('remove line', filedata, i, '')
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elif stmt and '{' in strippedline and strippedline.find('}') == len(strippedline) - 1:
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replaceandrun('remove line', filedata, i, '')
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if strippedline[-1] in ';{}':
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stmt = True
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else:
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stmt = False
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# reduce..
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print('Make sure error can be reproduced...')
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elapsed_time = None
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t = time.time()
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if not runtool():
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print("Cannot reproduce")
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sys.exit(1)
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elapsed_time = time.time() - t
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print('elapsed_time: {}'.format(elapsed_time))
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f = open(FILE, 'rt')
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filedata = f.readlines()
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f.close()
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writefile(ORGFILE, filedata)
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while True:
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filedata1 = list(filedata)
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print('remove preprocessor directives...')
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removedirectives(filedata)
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print('remove blocks...')
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filedata = removeblocks(filedata)
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print('remove comments...')
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removecomments(filedata)
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print('combine lines..')
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combinelines(filedata)
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print('remove line...')
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removeline(filedata)
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# if filedata and filedata2 are identical then stop
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if filedata1 == filedata:
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break
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writefile(FILE, filedata)
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print('DONE')
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