cppcheck/addons/y2038/y2038.py

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#! /usr/bin/python
#
# cppcheck addon for Y2038 safeness detection
#
# Detects:
#
# 1. _TIME_BITS being defined to something else than 64 bits
# 2. _USE_TIME_BITS64 being defined when _TIME_BITS is not
# 3. Any Y2038-sensitive symbol when _USE_TIME_BITS64 is not defined.
#
# Example usage:
# $ cppcheck --dump path-to-src/
# $ y2038.py path-to-src/
#
# y2038.py will walk the source tree for .dump files.
import cppcheckdata
import sys
import os
import re
import argparse
#---------------
# Error handling
#---------------
diagnostics = {}
def reportDiagnostic(template, configuration, file, line, severity, message):
# collect diagnostics by configuration
if not configuration in diagnostics:
diagnostics[configuration] = []
# add error to this configuration
diagnostics[configuration].append(
cppcheckdata.reportError(template, [[file, line]], severity, message))
def printDiagnostics():
for cfg in diagnostics:
sys.stderr.write('# Configuration "' + cfg + '":\n')
for diag in diagnostics[cfg]:
sys.stderr.write(diag + '\n')
def reportDirDiag(template, cfg, filename, linenr, directive, severity, msg):
reportDiagnostic(template, cfg.name,
directive.file, directive.linenr,
severity, msg)
if (filename != directive.file) or (linenr != directive.linenr):
reportDiagnostic(template, cfg.name,
filename, linenr, 'information',
directive.file + ' was included from here')
def reportTokDiag(template, cfg, token, severity, msg):
reportDiagnostic(template, cfg.name,
token.file, token.linenr,
severity, msg)
#---------------------------------------------
# #define/#undef detection regular expressions
#---------------------------------------------
# test for '#define _TIME_BITS 64'
re_define_time_bits_64 = re.compile(r'^\s*#\s*define\s+_TIME_BITS\s+64\s*$')
# test for '#define _TIME_BITS ...' (combine w/ above to test for 'not 64')
re_define_time_bits = re.compile(r'^\s*#\s*define\s+_TIME_BITS\s+.*$')
# test for '#undef _TIME_BITS' (if it ever happens)
re_undef_time_bits = re.compile(r'^\s*#\s*undef\s+_TIME_BITS\s*$')
# test for '#define _USE_TIME_BITS64'
re_define_use_time_bits64 = re.compile(r'^\s*#\s*define\s+_USE_TIME_BITS64\s*$')
# test for '#undef _USE_TIME_BITS64' (if it ever happens)
re_undef_use_time_bits64 = re.compile(r'^\s*#\s*undef\s+_USE_TIME_BITS64\s*$')
#------------------------------------
# List of Y2038-sensitive identifiers
#------------------------------------
# This is WIP. Eventually it should contain all identifiers (types
# and functions) which would be affected by the Y2038 bug.
id_Y2038 = [
'time_t',
'timespec',
'clock_gettime'
]
# return all files ending in .dump among or under the given paths
def find_dump_files(paths):
dumpfiles = []
for path in paths:
if path.endswith('.dump'):
if not path in dumpfiles:
dumpfiles.append(path)
else:
for (top, subdirs, files) in os.walk(path):
for file in files:
if file.endswith('.dump'):
f = top+'/'+file
if not f in dumpfiles:
dumpfiles.append(f)
dumpfiles.sort()
return dumpfiles
#------------------
# Let's get to work
#------------------
# extend cppcheck parser with our own options
parser = cppcheckdata.ArgumentParser()
parser.add_argument('-q', '--quiet', action='store_true',
help='do not print "Checking ..." lines')
parser.add_argument('paths', nargs='+', metavar='path',
help='path to dump file or directory')
# parse command line
args = parser.parse_args()
# now operate on each file in turn
dumpfiles = find_dump_files(args.paths)
for dumpfile in dumpfiles:
if not args.quiet:
print('Checking ' + dumpfile + '...')
srcfile = dumpfile.rstrip('.dump')
# at the start of the check, we don't know if code is Y2038 safe
y2038safe = False
# load XML from .dump file
data = cppcheckdata.parsedump(dumpfile)
# go through each configuration
for cfg in data.configurations:
if not args.quiet:
print('Checking ' + dumpfile + ', config "' + cfg.name + '"...')
safe_ranges = []
safe = -1
time_bits_defined = False
for directive in cfg.directives:
# track source line number
if directive.file == srcfile:
srclinenr = directive.linenr
# check for correct _TIME_BITS if present
if re_define_time_bits_64.match(directive.str):
time_bits_defined = True
elif re_define_time_bits.match(directive.str):
reportDirDiag(args.template, cfg, srcfile, srclinenr,
directive, 'error',
'_TIME_BITS must be defined equal to 64')
time_bits_defined = False
elif re_undef_time_bits.match(directive.str):
time_bits_defined = False
# check for _USE_TIME_BITS64 (un)definition
if re_define_use_time_bits64.match(directive.str):
safe = int(srclinenr)
# warn about _TIME_BITS not being defined
if time_bits_defined == False:
reportDirDiag(args.template,
cfg, srcfile, srclinenr, directive, 'warning',
'_USE_TIME_BITS64 is defined but _TIME_BITS was not')
elif re_undef_use_time_bits64.match(directive.str):
unsafe = int(srclinenr)
# do we have a safe..unsafe area?
if safe > 0 and unsafe > safe:
safe_ranges.append((safe, unsafe))
safe = -1
# check end of source beyond last directive
if len(cfg.tokenlist) > 0:
unsafe = int(cfg.tokenlist[-1].linenr)
if safe > 0 and unsafe > safe:
safe_ranges.append((safe, unsafe))
# go through all tokens
for token in cfg.tokenlist:
if token.str in id_Y2038:
if not any(lower <= int(token.linenr) <= upper
for (lower, upper) in safe_ranges):
reportTokDiag(args.template, cfg, token, 'warning',
token.str + ' might be Y2038-sensitive')
token = token.next
printDiagnostics()