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misra.py
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#!/usr/bin/env python3
#
# MISRA C 2012 checkers
# Partially reused for "MISRA C++ 2008" checking
#
# Example usage of this addon (scan a sourcefile main.cpp)
# cppcheck --dump main.cpp
# python misra.py --rule-texts=<path-to-rule-texts> main.cpp.dump
#
# Limitations: This addon is released as open source. Rule texts can't be freely
# distributed. https://www.misra.org.uk/forum/viewtopic.php?f=56&t=1189
#
# The MISRA standard documents may be obtained from https://www.misra.org.uk
#
# Total number of rules: 143
from __future__ import print_function
import cppcheckdata
import itertools
import json
import sys
import re
import os
import argparse
import codecs
import string
import copy
try:
from itertools import izip as zip
except ImportError:
pass
import misra_9
def grouped(iterable, n):
"""s -> (s0,s1,s2,...sn-1), (sn,sn+1,sn+2,...s2n-1), (s2n,s2n+1,s2n+2,...s3n-1), ..."""
return zip(*[iter(iterable)] * n)
INT_TYPES = ['bool', 'char', 'short', 'int', 'long', 'long long']
STDINT_TYPES = ['%s%d_t' % (n, v) for n, v in itertools.product(
['int', 'uint', 'int_least', 'uint_least', 'int_fast', 'uint_fast'],
[8, 16, 32, 64])]
typeBits = {
'CHAR': None,
'SHORT': None,
'INT': None,
'LONG': None,
'LONG_LONG': None,
'POINTER': None
}
def isUnsignedType(ty):
return ty == 'unsigned' or ty.startswith('uint')
def simpleMatch(token, pattern):
return cppcheckdata.simpleMatch(token, pattern)
def rawlink(rawtoken):
if rawtoken.str == '}':
indent = 0
while rawtoken:
if rawtoken.str == '}':
indent = indent + 1
elif rawtoken.str == '{':
indent = indent - 1
if indent == 0:
break
rawtoken = rawtoken.previous
else:
rawtoken = None
return rawtoken
# Identifiers described in Section 7 "Library" of C90 Standard
# Based on ISO/IEC9899:1990 Annex D -- Library summary and
# Annex E -- Implementation limits.
C90_STDLIB_IDENTIFIERS = {
# D.1 Errors
'errno.h': ['EDOM', 'ERANGE', 'errno'],
# D.2 Common definitions
'stddef.h': ['NULL', 'offsetof', 'ptrdiff_t', 'size_t', 'wchar_t'],
# D.3 Diagnostics
'assert.h': ['NDEBUG', 'assert'],
# D.4 Character handling
'ctype.h': [
'isalnum', 'isalpha', 'isblank', 'iscntrl', 'isdigit',
'isgraph', 'islower', 'isprint', 'ispunct', 'isspace',
'isupper', 'isxdigit', 'tolower', 'toupper',
],
# D.5 Localization
'locale.h': [
'LC_ALL', 'LC_COLLATE', 'LC_CTYPE', 'LC_MONETARY',
'LC_NUMERIC', 'LC_TIME', 'NULL', 'lconv',
'setlocale', 'localeconv',
],
# D.6 Mathematics
'math.h': [
'HUGE_VAL', 'acos', 'asin' , 'atan2', 'cos', 'sin', 'tan', 'cosh',
'sinh', 'tanh', 'exp', 'frexp', 'ldexp', 'log', 'loglO', 'modf',
'pow', 'sqrt', 'ceil', 'fabs', 'floor', 'fmod',
],
# D.7 Nonlocal jumps
'setjmp.h': ['jmp_buf', 'setjmp', 'longjmp'],
# D.8 Signal handling
'signal.h': [
'sig_atomic_t', 'SIG_DFL', 'SIG_ERR', 'SIG_IGN', 'SIGABRT', 'SIGFPE',
'SIGILL', 'SIGINT', 'SIGSEGV', 'SIGTERM', 'signal', 'raise',
],
# D.9 Variable arguments
'stdarg.h': ['va_list', 'va_start', 'va_arg', 'va_end'],
# D.10 Input/output
'stdio.h': [
'_IOFBF', '_IOLBF', '_IONBF', 'BUFSIZ', 'EOF', 'FILE', 'FILENAME_MAX',
'FOPEN_MAX', 'fpos_t', 'L_tmpnam', 'NULL', 'SEEK_CUR', 'SEEK_END',
'SEEK_SET', 'size_t', 'stderr', 'stdin', 'stdout', 'TMP_MAX',
'remove', 'rename', 'tmpfile', 'tmpnam', 'fclose', 'fflush', 'fopen',
'freopen', 'setbuf', 'setvbuf', 'fprintf', 'fscanf', 'printf',
'scanf', 'sprintf', 'sscanf', 'vfprintf', 'vprintf', 'vsprintf',
'fgetc', 'fgets', 'fputc', 'fputs', 'getc', 'getchar', 'gets', 'putc',
'putchar', 'puts', 'ungetc', 'fread', 'fwrite', 'fgetpos', 'fseek',
'fsetpos', 'rewind', 'clearerr', 'feof', 'ferror', 'perror',
],
# D.11 General utilities
'stdlib.h': [
'EXIT_FAILURE', 'EXIT_SUCCESS', 'MB_CUR_MAX', 'NULL', 'RAND_MAX',
'div_t', 'ldiv_t', 'wchar_t', 'atof', 'atoi', 'strtod', 'rand',
'srand', 'calloc', 'free', 'malloc', 'realloc', 'abort', 'atexit',
'exit', 'getenv', 'system', 'bsearch', 'qsort', 'abs', 'div', 'ldiv',
'mblen', 'mbtowc', 'wctomb', 'mbstowcs', 'wcstombs',
],
# D.12 String handling
'string.h': [
'NULL', 'size_t', 'memcpy', 'memmove', 'strcpy', 'strncpy', 'strcat',
'strncat', 'memcmp', 'strcmp', 'strcoll', 'strncmp', 'strxfrm',
'memchr', 'strchr', 'strcspn', 'strpbrk', 'strrchr', 'strspn',
'strstr', 'strtok', 'memset', 'strerror', 'strlen',
],
# D.13 Date and time
'time.h': [
'CLK_TCK', 'NULL', 'clock_t', 'time_t', 'size_t', 'tm', 'clock',
'difftime', 'mktime', 'time', 'asctime', 'ctime', 'gmtime',
'localtime', 'strftime',
],
# Annex E: Implementation limits
'limits.h': [
'CHAR_BIT', 'SCHAR_MIN', 'SCHAR_MAX', 'UCHAR_MAX', 'CHAR_MIN',
'CHAR_MAX', 'MB_LEN_MAX', 'SHRT_MIN', 'SHRT_MAX', 'USHRT_MAX',
'INT_MIN', 'INT_MAX', 'UINT_MAX', 'LONG_MIN', 'LONG_MAX', 'ULONG_MAX',
],
'float.h': [
'FLT_ROUNDS', 'FLT_RADIX', 'FLT_MANT_DIG', 'DBL_MANT_DIG',
'LDBL_MANT_DIG', 'DECIMAL_DIG', 'FLT_DIG', 'DBL_DIG', 'LDBL_DIG',
'DBL_MIN_EXP', 'LDBL_MIN_EXP', 'FLT_MIN_10_EXP', 'DBL_MIN_10_EXP',
'LDBL_MIN_10_EXP', 'FLT_MAX_EXP', 'DBL_MAX_EXP', 'LDBL_MAX_EXP',
'FLT_MAX_10_EXP', 'DBL_MAX_10_EXP', 'LDBL_MAX_10_EXP', 'FLT_MAX',
'DBL_MAX', 'LDBL_MAX', 'FLT_MIN', 'DBL_MIN', 'LDBL_MIN',
'FLT_EPSILON', 'DBL_EPSILON', 'LDBL_EPSILON'
],
}
# Identifiers described in Section 7 "Library" of C99 Standard
# Based on ISO/IEC 9899 WF14/N1256 Annex B -- Library summary
C99_STDLIB_IDENTIFIERS = {
# B.1 Diagnostics
'assert.h': C90_STDLIB_IDENTIFIERS['assert.h'],
# B.2 Complex
'complex.h': [
'complex', 'imaginary', 'I', '_Complex_I', '_Imaginary_I',
'CX_LIMITED_RANGE',
'cacos', 'cacosf', 'cacosl',
'casin', 'casinf', 'casinl',
'catan', 'catanf', 'catanl',
'ccos', 'ccosf', 'ccosl',
'csin', 'csinf', 'csinl',
'ctan', 'ctanf', 'ctanl',
'cacosh', 'cacoshf', 'cacoshl',
'casinh', 'casinhf', 'casinhl',
'catanh', 'catanhf', 'catanhl',
'ccosh', 'ccoshf', 'ccoshl',
'csinh', 'csinhf', 'csinhl',
'ctanh', 'ctanhf', 'ctanhl',
'cexp', 'cexpf', 'cexpl',
'clog', 'clogf', 'clogl',
'cabs', 'cabsf', 'cabsl',
'cpow', 'cpowf', 'cpowl',
'csqrt', 'csqrtf', 'csqrtl',
'carg', 'cargf', 'cargl',
'cimag', 'cimagf', 'cimagl',
'conj', 'conjf', 'conjl',
'cproj', 'cprojf', 'cprojl',
'creal', 'crealf', 'creall',
],
# B.3 Character handling
'ctype.h': C90_STDLIB_IDENTIFIERS['ctype.h'],
# B.4 Errors
'errno.h': C90_STDLIB_IDENTIFIERS['errno.h'] + ['EILSEQ'],
# B.5 Floating-point environment
'fenv.h': [
'fenv_t', 'FE_OVERFLOW', 'FE_TOWARDZERO',
'fexcept_t', 'FE_UNDERFLOW', 'FE_UPWARD',
'FE_DIVBYZERO', 'FE_ALL_EXCEPT', 'FE_DFL_ENV',
'FE_INEXACT', 'FE_DOWNWARD',
'FE_INVALID', 'FE_TONEAREST',
'FENV_ACCESS',
'feclearexcept', 'fegetexceptflag', 'fegetround',
'fesetround', 'fegetenv', 'feholdexcept',
'fesetenv', 'feupdateenv',
],
# B.6 Characteristics of floating types
'float.h': C90_STDLIB_IDENTIFIERS['float.h'] + ['FLT_EVAL_METHOD'],
# B.7 Format conversion of integer types
'inttypes.h': [
'imaxdiv_t', 'imaxabs', 'imaxdiv', 'strtoimax',
'strtoumax', 'wcstoimax', 'wcstoumax',
],
# B.8 Alternative spellings
'iso646.h': [
'and', 'and_eq', 'bitand', 'bitor', 'compl', 'not', 'not_eq',
'or', 'or_eq', 'xor', 'xor_eq',
],
# B.9 Size of integer types
'limits.h': C90_STDLIB_IDENTIFIERS['limits.h'] +
['LLONG_MIN', 'LLONG_MAX', 'ULLONG_MAX'],
# B.10 Localization
'locale.h': C90_STDLIB_IDENTIFIERS['locale.h'],
# B.11 Mathematics
'math.h': C90_STDLIB_IDENTIFIERS['math.h'] + [
'float_t', 'double_t', 'HUGE_VAL', 'HUGE_VALF', 'HUGE_VALL',
'INFINITY', 'NAN', 'FP_INFINITE', 'FP_NAN', 'FP_NORMAL',
'FP_SUBNORMAL', 'FP_ZERO', 'FP_FAST_FMA', 'FP_FAST_FMAF',
'FP_FAST_FMAL', 'FP_ILOGB0', 'FP_ILOGBNAN', 'MATH_ERRNO',
'MATH_ERREXCEPT', 'math_errhandling', 'FP_CONTRACT', 'fpclassify',
'isfinite', 'isinf', 'isnan', 'isnormal', 'signbit', 'acosf', 'acosl',
'asinf', 'asinl', 'atanf', 'atanl', 'atan2', 'atan2f', 'atan2l',
'cosf', 'cosl', 'sinf', 'sinl', 'tanf', 'tanl', 'acosh', 'acoshf',
'acoshl', 'asinh', 'asinhf', 'asinhl', 'atanh', 'atanhf', 'atanhl',
'cosh', 'coshf', 'coshl', 'sinh', 'sinhf', 'sinhl', 'tanh', 'tanhf',
'tanhl', 'expf', 'expl', 'exp2', 'exp2f', 'exp2l', 'expm1', 'expm1f',
'expm1l', 'frexpf', 'frexpl', 'ilogb', 'ilogbf', 'ilogbl', 'float',
'ldexpl', 'logf', 'logl', 'log10f', 'log10l', 'log1p', 'log1pf',
'log1pl', 'log2', 'log2f', 'log2l', 'logb', 'logbf', 'logbl', 'modff',
'modfl', 'scalbn', 'scalbnf', 'scalbnl', 'scalbln', 'scalblnf',
'scalblnl', 'hypotl', 'powf', 'powl', 'sqrtf', 'sqrtl', 'erf', 'erff',
'erfl', 'erfc', 'erfcf', 'erfcl', 'lgamma', 'lgammaf', 'lgammal',
'tgamma', 'tgammaf', 'tgammal', 'ceilf', 'ceill', 'floorf', 'floorl',
'nearbyint', 'nearbyintf', 'nearbyintl', 'rint', 'rintf', 'rintl',
'lrint', 'lrintf', 'lrintl', 'llrint', 'llrintf', 'llrintl', 'round',
'roundf', 'roundl', 'lround', 'lroundf', 'lroundl', 'llround',
'llroundf', 'llroundl', 'trunc', 'truncf', 'truncl', 'fmodf', 'fmodl',
'remainder', 'remainderf', 'remainderl', 'remquo', 'remquof',
'remquol', 'copysign', 'copysignf', 'copysignl', 'nan', 'nanf',
'nanl', 'nextafter', 'nextafterf', 'nextafterl', 'nexttoward',
'nexttowardf', 'nexttowardl', 'fdim', 'fdimf', 'fdiml', 'fmax',
'fmaxf', 'fmaxl', 'fmin', 'fminf', 'fminl', 'fmal', 'isgreater',
'isgreaterequal', 'isless', 'islessequal', 'islessgreater',
'isunordered',
],
# B.12 Nonlocal jumps
'setjmp.h': C90_STDLIB_IDENTIFIERS['setjmp.h'],
# B.13 Signal handling
'signal.h': C90_STDLIB_IDENTIFIERS['signal.h'],
# B.14 Variable arguments
'stdarg.h': C90_STDLIB_IDENTIFIERS['stdarg.h'] + ['va_copy'],
# B.15 Boolean type and values
'stdbool.h': ['bool', 'true', 'false', '__bool_true_false_are_defined'],
# B.16 Common definitions
'stddef.h': C90_STDLIB_IDENTIFIERS['stddef.h'],
# B.17 Integer types
'stdint.h': [
'intptr_t', 'uintptr_t', 'intmax_t', 'uintmax_t', 'INTN_MIN',
'INTN_MAX', 'UINTN_MAX', 'INT_LEASTN_MIN', 'INT_LEASTN_MAX',
'UINT_LEASTN_MAX', 'INT_FASTN_MIN', 'INT_FASTN_MAX', 'UINT_FASTN_MAX',
'INTPTR_MIN', 'INTPTR_MAX', 'UINTPTR_MAX', 'INTMAX_MIN', 'INTMAX_MAX',
'UINTMAX_MAX', 'PTRDIFF_MIN', 'PTRDIFF_MAX', 'SIG_ATOMIC_MIN',
'SIG_ATOMIC_MAX', 'SIZE_MAX', 'WCHAR_MIN', 'WCHAR_MAX', 'WINT_MIN',
'WINT_MAX', 'INTN_C', 'UINTN_C', 'INTMAX_C', 'UINTMAX_C',
] + STDINT_TYPES,
# B.18 Input/output
'stdio.h': C90_STDLIB_IDENTIFIERS['stdio.h'] + [
'mode', 'restrict', 'snprintf', 'vfscanf', 'vscanf',
'vsnprintf', 'vsscanf',
],
# B.19 General utilities
'stdlib.h': C90_STDLIB_IDENTIFIERS['stdlib.h'] + [
'_Exit', 'labs', 'llabs', 'lldiv', 'lldiv_t', 'strtof', 'strtol',
'strtold', 'strtoll', 'strtoul', 'strtoull'
],
# B.20 String handling
'string.h': C90_STDLIB_IDENTIFIERS['string.h'],
# B.21 Type-generic math
'tgmath.h': [
'acos', 'asin', 'atan', 'acosh', 'asinh', 'atanh', 'cos', 'sin', 'tan',
'cosh', 'sinh', 'tanh', 'exp', 'log', 'pow', 'sqrt', 'fabs', 'atan2',
'cbrt', 'ceil', 'copysign', 'erf', 'erfc', 'exp2', 'expm1', 'fdim',
'floor', 'fma', 'fmax', 'fmin', 'fmod', 'frexp', 'hypot', 'ilogb',
'ldexp', 'lgamma', 'llrint', 'llround', 'log10', 'log1p', 'log2',
'logb', 'lrint', 'lround', 'nearbyint', 'nextafter', 'nexttoward',
'remainder', 'remquo', 'rint', 'round', 'scalbn', 'scalbln', 'tgamma',
'trunc', 'carg', 'cimag', 'conj', 'cproj', 'creal',
],
# B.22 Date and time
'time.h': C90_STDLIB_IDENTIFIERS['time.h'] + ['CLOCKS_PER_SEC'],
# B.23 Extended multibyte/wide character utilities
'wchar.h': [
'wchar_t', 'size_t', 'mbstate_t', 'wint_t', 'tm', 'NULL', 'WCHAR_MAX',
'WCHAR_MIN', 'WEOF', 'fwprintf', 'fwscanf', 'swprintf', 'swscanf',
'vfwprintf', 'vfwscanf', 'vswprintf', 'vswscanf', 'vwprintf',
'vwscanf', 'wprintf', 'wscanf', 'fgetwc', 'fgetws', 'fputwc', 'fputws',
'fwide', 'getwc', 'getwchar', 'putwc', 'putwchar', 'ungetwc', 'wcstod',
'wcstof', 'double', 'int', 'long', 'long', 'long', 'wcscpy', 'wcsncpy',
'wmemcpy', 'wmemmove', 'wcscat', 'wcsncat', 'wcscmp', 'wcscoll',
'wcsncmp', 'wcsxfrm', 'wmemcmp', 'wcschr', 'wcscspn', 'wcspbrk',
'wcsrchr', 'wcsspn', 'wcsstr', 'wcstok', 'wmemchr', 'wcslen',
'wmemset', 'wcsftime', 'btowc', 'wctob', 'mbsinit', 'mbrlen',
'mbrtowc', 'wcrtomb', 'mbsrtowcs', 'wcsrtombs',
],
}
def isStdLibId(id_, standard='c99'):
id_lists = []
if standard == 'c89':
id_lists = C90_STDLIB_IDENTIFIERS.values()
elif standard in ('c99', 'c11'):
id_lists = C99_STDLIB_IDENTIFIERS.values()
for l in id_lists:
if id_ in l:
return True
return False
# Reserved keywords defined in ISO/IEC9899:1990 -- ch 6.1.1
C90_KEYWORDS = {
'auto', 'break', 'case', 'char', 'const', 'continue', 'default', 'do',
'double', 'else', 'enum', 'extern', 'float', 'for', 'goto', 'if',
'int', 'long', 'register', 'return', 'short', 'signed',
'sizeof', 'static', 'struct', 'switch', 'typedef', 'union', 'unsigned',
'void', 'volatile', 'while'
}
# Reserved keywords defined in ISO/IEC 9899 WF14/N1256 -- ch. 6.4.1
C99_ADDED_KEYWORDS = {
'inline', 'restrict', '_Bool', '_Complex', '_Imaginary',
'bool', 'complex', 'imaginary'
}
C11_ADDED_KEYWORDS = {
'_Alignas', '_Alignof', '_Atomic', '_Generic', '_Noreturn',
'_Statis_assert', '_Thread_local' ,
'alignas', 'alignof', 'noreturn', 'static_assert'
}
def isKeyword(keyword, standard='c99'):
kw_set = {}
if standard == 'c89':
kw_set = C90_KEYWORDS
elif standard == 'c99':
kw_set = copy.copy(C90_KEYWORDS)
kw_set.update(C99_ADDED_KEYWORDS)
else:
kw_set = copy.copy(C90_KEYWORDS)
kw_set.update(C99_ADDED_KEYWORDS)
kw_set.update(C11_ADDED_KEYWORDS)
return keyword in kw_set
def is_source_file(file):
return file.endswith('.c')
def is_header(file):
return file.endswith('.h')
def is_errno_setting_function(function_name):
return function_name and \
function_name in ('ftell', 'fgetpos', 'fsetpos', 'fgetwc', 'fputwc'
'strtoimax', 'strtoumax', 'strtol', 'strtoul',
'strtoll', 'strtoull', 'strtof', 'strtod', 'strtold'
'wcstoimax', 'wcstoumax', 'wcstol', 'wcstoul',
'wcstoll', 'wcstoull', 'wcstof', 'wcstod', 'wcstold'
'wcrtomb', 'wcsrtombs', 'mbrtowc')
def get_type_conversion_to_from(token):
def get_vartok(expr):
while expr:
if isCast(expr):
if expr.astOperand2 is None:
expr = expr.astOperand1
else:
expr = expr.astOperand2
elif expr.str in ('.', '::'):
expr = expr.astOperand2
elif expr.str == '[':
expr = expr.astOperand1
else:
break
return expr if (expr and expr.variable) else None
if isCast(token):
vartok = get_vartok(token)
if vartok:
return (token.next, vartok.variable.typeStartToken)
elif token.str == '=':
lhs = get_vartok(token.astOperand1)
rhs = get_vartok(token.astOperand2)
if lhs and rhs:
return (lhs.variable.typeStartToken, rhs.variable.typeStartToken)
return None
def is_composite_expr(expr, composite_operator=False):
"""MISRA C 2012, section 8.10.3"""
if expr is None:
return False
if not composite_operator:
if expr.str == '?' and simpleMatch(expr.astOperand2, ':'):
colon = expr.astOperand2
return is_composite_expr(colon.astOperand1,True) or is_composite_expr(colon.astOperand2, True)
if (expr.str in ('+', '-', '*', '/', '%', '&', '|', '^', '>>', "<<", "?", ":", '~')):
return is_composite_expr(expr.astOperand1,True) or is_composite_expr(expr.astOperand2, True)
return False
# non constant expression?
if expr.isNumber:
return False
if expr.astOperand1 or expr.astOperand2:
return is_composite_expr(expr.astOperand1,True) or is_composite_expr(expr.astOperand2, True)
return True
def getEssentialTypeCategory(expr):
if not expr:
return None
if expr.str == ',':
return getEssentialTypeCategory(expr.astOperand2)
if expr.str in ('<', '<=', '==', '!=', '>=', '>', '&&', '||', '!'):
return 'bool'
if expr.str in ('<<', '>>'):
# TODO this is incomplete
return getEssentialTypeCategory(expr.astOperand1)
if len(expr.str) == 1 and expr.str in '+-*/%&|^':
# TODO this is incomplete
e1 = getEssentialTypeCategory(expr.astOperand1)
e2 = getEssentialTypeCategory(expr.astOperand2)
# print('{0}: {1} {2}'.format(expr.str, e1, e2))
if e1 and e2 and e1 == e2:
return e1
if expr.valueType:
return expr.valueType.sign
if expr.valueType and expr.valueType.typeScope and expr.valueType.typeScope.className:
return "enum<" + expr.valueType.typeScope.className + ">"
# Unwrap membership, dereferences and array indexing
vartok = expr
while True:
if simpleMatch(vartok, '[') or (vartok and vartok.str == '*' and vartok.astOperand2 is None):
vartok = vartok.astOperand1
elif simpleMatch(vartok, '.'):
vartok = vartok.astOperand2
else:
break
if vartok and vartok.variable:
typeToken = vartok.variable.typeStartToken
while typeToken and typeToken.isName:
if typeToken.str == 'char' and not typeToken.isSigned and not typeToken.isUnsigned:
return 'char'
if typeToken.valueType:
if typeToken.valueType.type == 'bool':
return typeToken.valueType.type
if typeToken.valueType.type in ('float', 'double', 'long double'):
return "float"
if typeToken.valueType.sign:
return typeToken.valueType.sign
typeToken = typeToken.next
# See Appendix D, section D.6, Character constants
if expr.str[0] == "'" and expr.str[-1] == "'":
if len(expr.str) == 3 or (len(expr.str) == 4 and expr.str[1] == '\\'):
return 'char'
return expr.valueType.sign
if (expr.isCast and expr.str == "("):
castTok = expr.next
while castTok.isName or castTok.str == "*":
if castTok.str == 'char' and not castTok.isSigned and not castTok.isUnsigned:
return 'char'
castTok = castTok.next
if expr.valueType:
return expr.valueType.sign
return None
def getEssentialCategorylist(operand1, operand2):
if not operand1 or not operand2:
return None, None
if (operand1.str in ('++', '--') or
operand2.str in ('++', '--')):
return None, None
if ((operand1.valueType and operand1.valueType.pointer) or
(operand2.valueType and operand2.valueType.pointer)):
return None, None
e1 = getEssentialTypeCategory(operand1)
e2 = getEssentialTypeCategory(operand2)
return e1, e2
def get_essential_type_from_value(value, is_signed):
if value is None:
return None
for t in ('char', 'short', 'int', 'long', 'long long'):
bits = bitsOfEssentialType(t)
if bits >= 64:
continue
if is_signed:
range_min = -(1 << (bits - 1))
range_max = (1 << (bits - 1)) - 1
else:
range_min = 0
range_max = (1 << bits) - 1
sign = 'signed' if is_signed else 'unsigned'
if is_signed and value < 0 and value >= range_min:
return '%s %s' % (sign, t)
if value >= 0 and value <= range_max:
return '%s %s' % (sign, t)
return None
def getEssentialType(expr):
if not expr:
return None
# See Appendix D, section D.6, Character constants
if expr.str[0] == "'" and expr.str[-1] == "'":
if len(expr.str) == 3 or (len(expr.str) == 4 and expr.str[1] == '\\'):
return 'char'
return '%s %s' % (expr.valueType.sign, expr.valueType.type)
if expr.variable or isCast(expr):
typeToken = expr.variable.typeStartToken if expr.variable else expr.next
while typeToken and typeToken.isName:
if typeToken.str == 'char' and not typeToken.isSigned and not typeToken.isUnsigned:
return 'char'
typeToken = typeToken.next
if expr.valueType:
if expr.valueType.type == 'bool':
return 'bool'
if expr.valueType.isFloat():
return expr.valueType.type
if expr.valueType.isIntegral():
if (expr.valueType.sign is None) and expr.valueType.type == 'char':
return 'char'
return '%s %s' % (expr.valueType.sign, expr.valueType.type)
elif expr.isNumber:
# Appendix D, D.6 The essential type of literal constants
# Integer constants
if expr.valueType.type == 'bool':
return 'bool'
if expr.valueType.isFloat():
return expr.valueType.type
if expr.valueType.isIntegral():
if expr.valueType.type != 'int':
return '%s %s' % (expr.valueType.sign, expr.valueType.type)
return get_essential_type_from_value(expr.getKnownIntValue(), expr.valueType.sign == 'signed')
elif expr.str in ('<', '<=', '>=', '>', '==', '!=', '&&', '||', '!'):
return 'bool'
elif expr.astOperand1 and expr.astOperand2 and expr.str in (
'+', '-', '*', '/', '%', '&', '|', '^', '>>', "<<", "?", ":"):
if expr.astOperand1.valueType and expr.astOperand1.valueType.pointer > 0:
return None
if expr.astOperand2.valueType and expr.astOperand2.valueType.pointer > 0:
return None
e1 = getEssentialType(expr.astOperand1)
e2 = getEssentialType(expr.astOperand2)
if e1 is None or e2 is None:
return None
if is_constant_integer_expression(expr):
sign1 = e1.split(' ')[0]
sign2 = e2.split(' ')[0]
if sign1 == sign2 and sign1 in ('signed', 'unsigned'):
e = get_essential_type_from_value(expr.getKnownIntValue(), sign1 == 'signed')
if e:
return e
if bitsOfEssentialType(e2) >= bitsOfEssentialType(e1):
return e2
else:
return e1
elif expr.str == "~":
e1 = getEssentialType(expr.astOperand1)
return e1
return None
def bitsOfEssentialType(ty):
if ty is None:
return 0
last_type = ty.split(' ')[-1]
if last_type == 'Boolean':
return 1
if last_type == 'char':
return typeBits['CHAR']
if last_type == 'short':
return typeBits['SHORT']
if last_type == 'int':
return typeBits['INT']
if ty.endswith('long long'):
return typeBits['LONG_LONG']
if last_type == 'long':
return typeBits['LONG']
for sty in STDINT_TYPES:
if ty == sty:
return int(''.join(filter(str.isdigit, sty)))
return 0
def get_function_pointer_type(tok):
ret = ''
while tok and (tok.isName or tok.str == '*'):
ret += ' ' + tok.str
tok = tok.next
if tok is None or tok.str != '(':
return None
tok = tok.link
if not simpleMatch(tok, ') ('):
return None
ret += '('
tok = tok.next.next
while tok and (tok.str not in '()'):
if tok.varId is None:
ret += ' ' + tok.str
tok = tok.next
if (tok is None) or tok.str != ')':
return None
return ret[1:] + ')'
def isCast(expr):
if not expr or expr.str != '(' or not expr.astOperand1 or expr.astOperand2:
return False
if simpleMatch(expr, '( )'):
return False
return True
def is_constant_integer_expression(expr):
if expr is None:
return False
if expr.isInt:
return True
if not expr.isArithmeticalOp:
return False
if expr.astOperand1 and not is_constant_integer_expression(expr.astOperand1):
return False
if expr.astOperand2 and not is_constant_integer_expression(expr.astOperand2):
return False
return True
def isFunctionCall(expr, std='c99'):
if not expr:
return False
if expr.str != '(' or not expr.astOperand1:
return False
if expr.astOperand1 != expr.previous:
return False
if isKeyword(expr.astOperand1.str, std):
return False
return True
def hasExternalLinkage(var):
return var.isGlobal and not var.isStatic
def countSideEffects(expr):
if not expr or expr.str in (',', ';'):
return 0
ret = 0
if expr.str in ('++', '--', '='):
ret = 1
return ret + countSideEffects(expr.astOperand1) + countSideEffects(expr.astOperand2)
def getForLoopExpressions(forToken):
if not forToken or forToken.str != 'for':
return None
lpar = forToken.next
if not lpar or lpar.str != '(':
return None
if not lpar.astOperand2 or lpar.astOperand2.str != ';':
return None
if not lpar.astOperand2.astOperand2 or lpar.astOperand2.astOperand2.str != ';':
return None
return [lpar.astOperand2.astOperand1,
lpar.astOperand2.astOperand2.astOperand1,
lpar.astOperand2.astOperand2.astOperand2]
def get_function_scope(cfg, func):
if func:
for scope in cfg.scopes:
if scope.function == func:
return scope
return None
def is_variable_changed(start_token, end_token, var):
"""Check if variable is updated between body_start and body_end"""
tok = start_token
while tok != end_token:
if tok.isAssignmentOp:
vartok = tok.astOperand1
while vartok.astOperand1:
vartok = vartok.astOperand1
if vartok and vartok.variable == var:
return True
tok = tok.next
return False
def getForLoopCounterVariables(forToken, cfg):
""" Return a set of Variable objects defined in ``for`` statement and
satisfy requirements to loop counter term from section 8.14 of MISRA
document.
"""
if not forToken or forToken.str != 'for':
return None
tn = forToken.next
if not tn or tn.str != '(':
return None
vars_defined = set()
vars_initialized = set()
vars_exit = set()
vars_modified = set()
cur_clause = 1
te = tn.link
while tn and tn != te:
if tn.variable:
if cur_clause == 1 and tn.variable.nameToken == tn:
vars_defined.add(tn.variable)
elif cur_clause == 2:
vars_exit.add(tn.variable)
elif cur_clause == 3:
if tn.next and countSideEffectsRecursive(tn.next) > 0:
vars_modified.add(tn.variable)
elif tn.previous and tn.previous.str in ('++', '--'):
tn_ast = tn.astParent
if tn_ast and tn_ast == tn.previous:
vars_modified.add(tn.variable)
elif tn_ast and tn_ast.str == '.' and tn_ast.astOperand2 and tn_ast.astOperand2.variable:
vars_modified.add(tn_ast.astOperand2.variable)
if cur_clause == 1 and tn.isAssignmentOp:
var_token = tn.astOperand1
while var_token and var_token.str == '.':
var_token = var_token.astOperand2
if var_token and var_token.variable:
vars_initialized.add(var_token.variable)
if cur_clause == 1 and tn.isName and tn.next.str == '(':
function_args_in_init = getArguments(tn.next)
function_scope = get_function_scope(cfg, tn.function)
for arg_nr in range(len(function_args_in_init)):
init_arg = function_args_in_init[arg_nr]
if init_arg is None or not init_arg.isUnaryOp('&'):
continue
var_token = init_arg.astOperand1
while var_token and var_token.str == '.':
var_token = var_token.astOperand2
if var_token is None or var_token.variable is None:
continue
changed = False
if function_scope is None:
changed = True
elif tn.function is None:
changed = True
else:
function_body_start = function_scope.bodyStart
function_body_end = function_scope.bodyEnd
args = tn.function.argument[arg_nr + 1]
if function_scope is None or is_variable_changed(function_body_start, function_body_end, args):
changed = True
if changed:
vars_initialized.add(var_token.variable)
if tn.str == ';':
cur_clause += 1
tn = tn.next
return vars_defined | vars_initialized, vars_exit & vars_modified
def findCounterTokens(cond):
if not cond:
return []
if cond.str in ['&&', '||']:
c = findCounterTokens(cond.astOperand1)
c.extend(findCounterTokens(cond.astOperand2))
return c
ret = []
if ((cond.isArithmeticalOp and cond.astOperand1 and cond.astOperand2) or
(cond.isComparisonOp and cond.astOperand1 and cond.astOperand2)):
if cond.astOperand1.isName:
ret.append(cond.astOperand1)
if cond.astOperand2.isName:
ret.append(cond.astOperand2)
if cond.astOperand1.isOp:
ret.extend(findCounterTokens(cond.astOperand1))
if cond.astOperand2.isOp:
ret.extend(findCounterTokens(cond.astOperand2))
return ret
def isFloatCounterInWhileLoop(whileToken):
if not simpleMatch(whileToken, 'while ('):
return False
lpar = whileToken.next
rpar = lpar.link
counterTokens = findCounterTokens(lpar.astOperand2)
whileBodyStart = None
if simpleMatch(rpar, ') {'):
whileBodyStart = rpar.next
elif simpleMatch(whileToken.previous, '} while') and simpleMatch(whileToken.previous.link.previous, 'do {'):
whileBodyStart = whileToken.previous.link
else:
return False
token = whileBodyStart
while token != whileBodyStart.link:
token = token.next
for counterToken in counterTokens:
if not counterToken.valueType or not counterToken.valueType.isFloat():
continue
if token.isAssignmentOp and token.astOperand1.str == counterToken.str:
return True
if token.str == counterToken.str and token.astParent and token.astParent.str in ('++', '--'):
return True
return False
def countSideEffectsRecursive(expr):
if not expr or expr.str == ';':
return 0
if expr.str == '=' and expr.astOperand1 and expr.astOperand1.str == '[':
prev = expr.astOperand1.previous
if prev and (prev.str == '{' or prev.str == '{'):
return countSideEffectsRecursive(expr.astOperand2)
if expr.str == '=' and expr.astOperand1 and expr.astOperand1.str == '.':
e = expr.astOperand1
while e and e.str == '.' and e.astOperand2:
e = e.astOperand1
if e and e.str == '.':
return 0
if expr.isAssignmentOp or expr.str in {'++', '--'}:
return 1
# Todo: Check function calls
return countSideEffectsRecursive(expr.astOperand1) + countSideEffectsRecursive(expr.astOperand2)
def isBoolExpression(expr):
if not expr:
return False
if expr.valueType and (expr.valueType.type == 'bool' or expr.valueType.bits == 1):
return True
return expr.str in ['!', '==', '!=', '<', '<=', '>', '>=', '&&', '||', '0', '1', 'true', 'false']
def isEnumConstant(expr):
if not expr or not expr.values:
return False
values = expr.values
return len(values) == 1 and values[0].valueKind == 'known'
def isConstantExpression(expr):
if expr.isNumber:
return True
if expr.isName and not isEnumConstant(expr):
return False
if simpleMatch(expr.previous, 'sizeof ('):
return True
if expr.astOperand1 and not isConstantExpression(expr.astOperand1):
return False
if expr.astOperand2 and not isConstantExpression(expr.astOperand2):
return False
return True
def isUnknownConstantExpression(expr):
if expr.isName and not isEnumConstant(expr) and expr.variable is None:
return True
if expr.astOperand1 and isUnknownConstantExpression(expr.astOperand1):
return True
if expr.astOperand2 and isUnknownConstantExpression(expr.astOperand2):
return True
return False
def isUnsignedInt(expr):
return expr and expr.valueType and expr.valueType.type in ('short', 'int') and expr.valueType.sign == 'unsigned'
def getPrecedence(expr):
if not expr:
return 16
if not expr.astOperand1 or not expr.astOperand2:
return 16
if expr.str in ('*', '/', '%'):
return 12
if expr.str in ('+', '-'):
return 11
if expr.str in ('<<', '>>'):
return 10
if expr.str in ('<', '>', '<=', '>='):
return 9
if expr.str in ('==', '!='):
return 8
if expr.str == '&':
return 7
if expr.str == '^':
return 6
if expr.str == '|':
return 5
if expr.str == '&&':
return 4
if expr.str == '||':
return 3
if expr.str in ('?', ':'):
return 2
if expr.isAssignmentOp:
return 1
if expr.str == ',':
return 0
return -1
def findRawLink(token):
tok1 = None
tok2 = None
forward = False
if token.str in '{([':
tok1 = token.str
tok2 = '})]'['{(['.find(token.str)]
forward = True
elif token.str in '})]':
tok1 = token.str
tok2 = '{(['['})]'.find(token.str)]
forward = False
else:
return None
# try to find link
indent = 0
while token:
if token.str == tok1:
indent = indent + 1
elif token.str == tok2:
if indent <= 1:
return token
indent = indent - 1
if forward is True:
token = token.next
else:
token = token.previous
# raw link not found
return None
def numberOfParentheses(tok1, tok2):
while tok1 and tok1 != tok2:
if tok1.str == '(' or tok1.str == ')':
return False
tok1 = tok1.next
return tok1 == tok2
def findGotoLabel(gotoToken):
label = gotoToken.next.str
tok = gotoToken.next.next
while tok:
if tok.str == '}' and tok.scope.type == 'Function':
break
if tok.str == label and tok.next.str == ':':
return tok
tok = tok.next
return None