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