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cppcheck/addons/misra.py

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#!/usr/bin/env python
#
# MISRA C 2012 checkers
#
# 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
import cppcheckdata
import sys
import re
import os
import tempfile
import subprocess
ruleTexts = {}
VERIFY = False
VERIFY_EXPECTED = []
VERIFY_ACTUAL = []
def reportError(location, num1, num2):
if VERIFY:
VERIFY_ACTUAL.append(str(location.linenr) + ':' + str(num1) + '.' + str(num2))
else:
num = num1 * 100 + num2
id = 'misra-c2012-' + str(num1) + '.' + str(num2)
if num in ruleTexts:
errmsg = ruleTexts[num] + ' [' + id + ']'
elif len(ruleTexts) == 0:
errmsg = 'misra violation (use --rule-texts=<file> to get proper output) [' + id + ']'
else:
return
sys.stderr.write('[' + location.file + ':' + str(location.linenr) + '] (style): ' + errmsg + '\n')
def simpleMatch(token, pattern):
for p in pattern.split(' '):
if not token or token.str != p:
return False
token = token.next
return True
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
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'
}
def getEssentialType(expr):
if not expr:
return None
if expr.variable:
typeToken = expr.variable.typeStartToken
while typeToken and typeToken.isName:
if typeToken.str in {'char', 'short', 'int', 'long', 'float', 'double'}:
return typeToken.str
typeToken = typeToken.next
elif expr.astOperand1 and expr.astOperand2 and expr.str in {'+', '-', '*', '/', '%', '&', '|', '^'}:
e1 = getEssentialType(expr.astOperand1)
e2 = getEssentialType(expr.astOperand2)
if not e1 or not e2:
return None
types = ['bool', 'char', 'short', 'int', 'long', 'long long']
try:
i1 = types.index(e1)
i2 = types.index(e2)
if i2 >= i1:
return types[i2]
return types[i1]
except ValueError:
return None
return None
def bitsOfEssentialType(expr):
type = getEssentialType(expr)
if type is None:
return 0
if type == 'char':
return CHAR_BIT
if type == 'short':
return SHORT_BIT
if type == 'int':
return INT_BIT
if type == 'long':
return LONG_BIT
if type == 'long long':
return LONG_LONG_BIT
return 0
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 isFunctionCall(expr):
if not expr:
return False
if expr.str != '(' or not expr.astOperand1:
return False
if expr.astOperand1 != expr.previous:
return False
if expr.astOperand1.str in KEYWORDS:
return False
return True
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 hasFloatComparison(expr):
if not expr:
return False
if expr.isLogicalOp:
return hasFloatComparison(expr.astOperand1) or hasFloatComparison(expr.astOperand2)
if expr.isComparisonOp:
# TODO: Use ValueType
return cppcheckdata.astIsFloat(expr.astOperand1) or cppcheckdata.astIsFloat(expr.astOperand2)
return False
def hasSideEffectsRecursive(expr):
if not expr:
return False
if expr.str == '=' and expr.astOperand1 and expr.astOperand1.str == '[':
prev = expr.astOperand1.previous
if prev and (prev.str == '{' or prev.str == '{'):
return hasSideEffectsRecursive(expr.astOperand2)
if expr.str in {'++', '--', '='}:
return True
# Todo: Check function calls
return hasSideEffectsRecursive(expr.astOperand1) or hasSideEffectsRecursive(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']
def isConstantExpression(expr):
if expr.isNumber:
return True
if expr.isName:
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 isUnsignedInt(expr):
# TODO this function is very incomplete. use ValueType?
if not expr:
return False
if expr.isNumber:
return 'u' in expr.str or 'U' in expr.str
if expr.str in {'+', '-', '*', '/', '%'}:
return isUnsignedInt(expr.astOperand1) or isUnsignedInt(expr.astOperand2)
return False
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 == 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
def findInclude(directives, header):
for directive in directives:
if directive.str == '#include ' + header:
return directive
return None
# Get function arguments
def getArgumentsRecursive(tok, arguments):
if tok is None:
return
if tok.str == ',':
getArgumentsRecursive(tok.astOperand1, arguments)
getArgumentsRecursive(tok.astOperand2, arguments)
else:
arguments.append(tok);
def getArguments(ftok):
arguments = []
getArgumentsRecursive(ftok.astOperand2, arguments)
return arguments
def isHexDigit(c):
return (c >= '0' and c <= '9') or (c >= 'a' and c <= 'f') or (c >= 'A' and c >= 'F')
def isOctalDigit(c):
return (c >= '0' and c <= '7')
def isNoReturnScope(tok):
if tok is None or tok.str != '}':
return False
if tok.previous is None or tok.previous.str != ';':
return False
if simpleMatch(tok.previous.previous, 'break ;'):
return True
prev = tok.previous.previous
while prev and prev.str not in ';{}':
if prev.str in '])':
prev = prev.link
prev = prev.previous
if prev and prev.next.str in ['throw', 'return']:
return True
return False
def misra_3_1(rawTokens):
for token in rawTokens:
if token.str.startswith('/*') or token.str.startswith('//'):
if '//' in token.str[2:] or '/*' in token.str[2:]:
reportError(token, 3, 1)
def misra_4_1(rawTokens):
for token in rawTokens:
if token.str[0] != '"':
continue
pos = 1
while pos < len(token.str) - 2:
pos1 = pos
pos = pos + 1
if token.str[pos1] != '\\':
continue
if token.str[pos1+1] == '\\':
pos = pos1 + 2
continue
if token.str[pos1+1] == 'x':
if not isHexDigit(token.str[pos1+2]):
reportError(token, 4, 1)
continue
if not isHexDigit(token.str[pos1+3]):
reportError(token, 4, 1)
continue
elif isOctalDigit(token.str[pos1+1]):
if not isOctalDigit(token.str[pos1+2]):
reportError(token, 4, 1)
continue
if not isOctalDigit(token.str[pos1+2]):
reportError(token, 4, 1)
continue
else:
continue
c = token.str[pos1 + 4]
if c != '"' and c != '\\':
reportError(token, 4, 1)
def misra_5_1(data):
for token in data.tokenlist:
if token.isName and len(token.str) > 31:
reportError(token, 5, 1)
def misra_5_3(data):
scopeVars = {}
for var in data.variables:
if var.isArgument:
# TODO
continue
if var.nameToken.scope not in scopeVars:
scopeVars[var.nameToken.scope] = []
scopeVars[var.nameToken.scope].append(var)
for innerScope in data.scopes:
if innerScope.type == 'Global':
continue
if innerScope not in scopeVars:
continue
for innerVar in scopeVars[innerScope]:
outerScope = innerScope.nestedIn
while outerScope:
if outerScope not in scopeVars:
outerScope = outerScope.nestedIn
continue
found = False
for outerVar in scopeVars[outerScope]:
if innerVar.nameToken.str == outerVar.nameToken.str:
found = True
break
if found:
reportError(innerVar.nameToken, 5, 3)
break
outerScope = outerScope.nestedIn
def misra_5_4(data):
for dir in data.directives:
if re.match(r'#define [a-zA-Z0-9_]{64,}', dir.str):
reportError(dir, 5, 4)
def misra_5_5(data):
macroNames = []
for dir in data.directives:
res = re.match(r'#define ([A-Za-z0-9_]+)', dir.str)
if res:
macroNames.append(res.group(1))
for var in data.variables:
if var.nameToken.str in macroNames:
reportError(var.nameToken, 5, 5)
def misra_7_1(rawTokens):
for tok in rawTokens:
if re.match(r'^0[0-7]+$', tok.str):
reportError(tok, 7, 1)
def misra_7_3(rawTokens):
for tok in rawTokens:
if re.match(r'^[0-9]+l', tok.str):
reportError(tok, 7, 3)
def misra_8_11(data):
for var in data.variables:
if var.isExtern and simpleMatch(var.nameToken.next, '[ ]') and var.nameToken.scope.type == 'Global':
reportError(var.nameToken, 8, 11)
def misra_8_12(data):
for token in data.tokenlist:
if token.str != '{':
continue
if not token.scope or token.scope.type != 'Enum':
continue
etok = token
values = []
while etok:
if etok.str == '}':
break
if etok.str == '=':
rhsValues = etok.astOperand2.values
if rhsValues and len(rhsValues) == 1:
if rhsValues[0].intvalue in values:
reportError(etok, 8, 12)
break
values.append(rhsValues[0].intvalue)
etok = etok.next
def misra_8_14(rawTokens):
for token in rawTokens:
if token.str == 'restrict':
reportError(token, 8, 14)
def misra_9_5(rawTokens):
for token in rawTokens:
if simpleMatch(token, '[ ] = { ['):
reportError(token, 9, 5)
def misra_10_4(data):
for token in data.tokenlist:
if token.str not in {'+', '-', '*', '/', '%', '&', '|', '^'} and not token.isComparisonOp:
continue
if not token.astOperand1 or not token.astOperand2:
continue
if not token.astOperand1.valueType or not token.astOperand2.valueType:
continue
if not token.astOperand1.valueType.isIntegral() or not token.astOperand2.valueType.isIntegral():
continue
e1 = getEssentialType(token.astOperand1)
e2 = getEssentialType(token.astOperand2)
if e1 and e2 and e1 != e2:
reportError(token, 10, 4)
def misra_10_6(data):
for token in data.tokenlist:
if token.str != '=' or not token.astOperand1 or not token.astOperand2:
continue
vt1 = token.astOperand1.valueType
vt2 = token.astOperand2.valueType
if not vt1 or vt1.pointer > 0:
continue
if not vt2 or vt2.pointer > 0:
continue
try:
intTypes = ['char', 'short', 'int', 'long', 'long long']
index1 = intTypes.index(vt1.type)
e = getEssentialType(token.astOperand2)
if not e:
continue
index2 = intTypes.index(e)
if index1 > index2:
reportError(token, 10, 6)
except ValueError:
pass
def misra_10_8(data):
for token in data.tokenlist:
if not isCast(token):
continue
if not token.valueType or token.valueType.pointer > 0:
continue
if not token.astOperand1.valueType or token.astOperand1.valueType.pointer > 0:
continue
if not token.astOperand1.astOperand1:
continue
try:
intTypes = ['char', 'short', 'int', 'long', 'long long']
index1 = intTypes.index(token.valueType.type)
e = getEssentialType(token.astOperand1)
if not e:
continue
index2 = intTypes.index(e)
if index1 > index2:
reportError(token, 10, 8)
except ValueError:
pass
def misra_11_3(data):
for token in data.tokenlist:
if not isCast(token):
continue
vt1 = token.valueType
vt2 = token.astOperand1.valueType
if not vt1 or not vt2:
continue
if vt1.pointer == vt2.pointer and vt1.pointer > 0 and vt1.type != vt2.type and\
vt1.isIntegral() and vt2.isIntegral() and vt1.type != 'char':
reportError(token, 11, 3)
def misra_11_4(data):
for token in data.tokenlist:
if not isCast(token):
continue
vt1 = token.valueType
vt2 = token.astOperand1.valueType
if not vt1 or not vt2:
continue
if vt1.pointer == 0 and vt2.pointer > 0 and vt2.type != 'void':
reportError(token, 11, 4)
def misra_11_5(data):
for token in data.tokenlist:
if not isCast(token):
continue
vt1 = token.valueType
vt2 = token.astOperand1.valueType
if not vt1 or not vt2:
continue
if vt1.pointer > 0 and vt1.type != 'void' and vt2.pointer == vt1.pointer and vt2.type == 'void':
reportError(token, 11, 5)
def misra_11_6(data):
for token in data.tokenlist:
if not isCast(token):
continue
vt1 = token.valueType
vt2 = token.astOperand1.valueType
if not vt1 or not vt2:
continue
if vt1.pointer == 1 and vt1.type == 'void' and vt2.pointer == 0:
reportError(token, 11, 6)
elif vt1.pointer == 0 and vt2.pointer == 1 and vt2.type == 'void':
reportError(token, 11, 6)
def misra_11_7(data):
for token in data.tokenlist:
if not isCast(token):
continue
vt1 = token.valueType
vt2 = token.astOperand1.valueType
if not vt1 or not vt2:
continue
if vt1.pointer > 0 and vt1.type == 'record' and\
vt2.pointer > 0 and vt2.type == 'record' and vt1.typeScopeId != vt2.typeScopeId:
reportError(token, 11, 7)
def misra_11_8(data):
# TODO: reuse code in CERT-EXP05
for token in data.tokenlist:
if isCast(token):
# C-style cast
if not token.valueType:
continue
if not token.astOperand1.valueType:
continue
if token.valueType.pointer == 0:
continue
if token.astOperand1.valueType.pointer == 0:
continue
const1 = token.valueType.constness
const2 = token.astOperand1.valueType.constness
if (const1 % 2) < (const2 % 2):
reportError(token, 11, 8)
elif token.str == '(' and token.astOperand1 and token.astOperand2 and token.astOperand1.function:
# Function call
function = token.astOperand1.function
arguments = getArguments(token)
for argnr, argvar in function.argument.items():
if argnr < 1 or argnr > len(arguments):
continue
if not argvar.isPointer:
continue
argtok = arguments[argnr - 1]
if not argtok.valueType:
continue
if argtok.valueType.pointer == 0:
continue
const1 = argvar.isConst
const2 = arguments[argnr - 1].valueType.constness
if (const1 % 2) < (const2 % 2):
reportError(token, 11, 8)
def misra_11_9(data):
for directive in data.directives:
res1 = re.match(r'#define ([A-Za-z_][A-Za-z_0-9]*) (.*)', directive.str)
if not res1:
continue
name = res1.group(1)
if name == 'NULL':
continue
value = res1.group(2).replace(' ', '')
if value == '((void*)0)':
reportError(directive, 11, 9)
def misra_12_1_sizeof(rawTokens):
state = 0
for tok in rawTokens:
if tok.str.startswith('//') or tok.str.startswith('/*'):
continue
if tok.str == 'sizeof':
state = 1
elif state == 1:
if re.match(r'^[a-zA-Z_]', tok.str):
state = 2
else:
state = 0
elif state == 2:
if tok.str in {'+', '-', '*', '/', '%'}:
reportError(tok, 12, 1)
else:
state = 0
def misra_12_1(data):
for token in data.tokenlist:
p = getPrecedence(token)
if p < 2 or p > 12:
continue
p1 = getPrecedence(token.astOperand1)
if p < p1 <= 12 and numberOfParentheses(token.astOperand1, token):
reportError(token, 12, 1)
continue
p2 = getPrecedence(token.astOperand2)
if p < p2 <= 12 and numberOfParentheses(token, token.astOperand2):
reportError(token, 12, 1)
continue
def misra_12_2(data):
for token in data.tokenlist:
if not (token.str in {'<<', '>>'}):
continue
if (not token.astOperand2) or (not token.astOperand2.values):
continue
maxval = 0
for val in token.astOperand2.values:
if val.intvalue and val.intvalue > maxval:
maxval = val.intvalue
if maxval == 0:
continue
sz = bitsOfEssentialType(token.astOperand1)
if sz <= 0:
continue
if maxval >= sz:
reportError(token, 12, 2)
def misra_12_3(data):
for token in data.tokenlist:
if token.str != ',' or token.scope.type == 'Enum' or token.scope.type == 'Class' or token.scope.type == 'Global':
continue
if token.astParent and token.astParent.str in ['(', ',', '{']:
continue
reportError(token, 12, 3)
def misra_12_4(data):
if INT_BIT == 16:
max_uint = 0xffff
elif INT_BIT == 32:
max_uint = 0xffffffff
else:
return
for token in data.tokenlist:
if (not isConstantExpression(token)) or (not isUnsignedInt(token)):
continue
if not token.values:
continue
for value in token.values:
if value.intvalue < 0 or value.intvalue > max_uint:
reportError(token, 12, 4)
break
def misra_13_1(data):
for token in data.tokenlist:
if token.str != '=':
continue
init = token.next
if init and init.str == '{' and hasSideEffectsRecursive(init):
reportError(init, 13, 1)
def misra_13_3(data):
for token in data.tokenlist:
if token.str not in {'++', '--'}:
continue
astTop = token
while astTop.astParent and astTop.astParent.str not in {',', ';'}:
astTop = astTop.astParent
if countSideEffects(astTop) >= 2:
reportError(astTop, 13, 3)
def misra_13_4(data):
for token in data.tokenlist:
if token.str != '=':
continue
if not token.astParent:
continue
if token.astOperand1.str == '[' and token.astOperand1.previous.str in {'{', ','}:
continue
if not (token.astParent.str in [',', ';']):
reportError(token, 13, 4)
def misra_13_5(data):
for token in data.tokenlist:
if token.isLogicalOp and hasSideEffectsRecursive(token.astOperand2):
reportError(token, 13, 5)
def misra_13_6(data):
for token in data.tokenlist:
if token.str == 'sizeof' and hasSideEffectsRecursive(token.next):
reportError(token, 13, 6)
def misra_14_1(data):
for token in data.tokenlist:
if token.str != 'for':
continue
exprs = getForLoopExpressions(token)
if exprs and hasFloatComparison(exprs[1]):
reportError(token, 14, 1)
def misra_14_2(data):
for token in data.tokenlist:
expressions = getForLoopExpressions(token)
if not expressions:
continue
if expressions[0] and not expressions[0].isAssignmentOp:
reportError(token, 14, 2)
elif hasSideEffectsRecursive(expressions[1]):
reportError(token, 14, 2)
def misra_14_4(data):
for token in data.tokenlist:
if token.str != '(':
continue
if not token.astOperand1 or not (token.astOperand1.str in ['if', 'while']):
continue
if not isBoolExpression(token.astOperand2):
reportError(token, 14, 4)
def misra_15_1(data):
for token in data.tokenlist:
if token.str == "goto":
reportError(token, 15, 1)
def misra_15_2(data):
for token in data.tokenlist:
if token.str != 'goto':
continue
if (not token.next) or (not token.next.isName):
continue
if not findGotoLabel(token):
reportError(token, 15, 2)
def misra_15_3(data):
for token in data.tokenlist:
if token.str != 'goto':
continue
if (not token.next) or (not token.next.isName):
continue
tok = findGotoLabel(token)
if not tok:
continue
scope = token.scope
while scope and scope != tok.scope:
scope = scope.nestedIn
if not scope:
reportError(token, 15, 3)
def misra_15_5(data):
for token in data.tokenlist:
if token.str == 'return' and token.scope.type != 'Function':
reportError(token, 15, 5)
def misra_15_6(rawTokens):
state = 0
indent = 0
tok1 = None
for token in rawTokens:
if token.str in ['if', 'for', 'while']:
if simpleMatch(token.previous, '# if'):
continue
if simpleMatch(token.previous, "} while"):
# is there a 'do { .. } while'?
start = rawlink(token.previous)
if start and simpleMatch(start.previous, 'do {'):
continue
if state == 2:
reportError(tok1, 15, 6)
state = 1
indent = 0
tok1 = token
elif token.str == 'else':
if simpleMatch(token.previous, '# else'):
continue
if simpleMatch(token, 'else if'):
continue
if state == 2:
reportError(tok1, 15, 6)
state = 2
indent = 0
tok1 = token
elif state == 1:
if indent == 0 and token.str != '(':
state = 0
continue
if token.str == '(':
indent = indent + 1
elif token.str == ')':
if indent == 0:
state = 0
elif indent == 1:
state = 2
indent = indent - 1
elif state == 2:
if token.str.startswith('//') or token.str.startswith('/*'):
continue
state = 0
if token.str != '{':
reportError(tok1, 15, 6)
def misra_15_7(data):
for token in data.tokenlist:
if not simpleMatch(token, '}'):
continue
if not token.scope.type == 'If':
continue
if not token.scope.nestedIn.type == 'Else':
continue
if not token.next.str == 'else':
reportError(token, 15, 7)
# TODO add 16.1 rule
def misra_16_2(data):
for token in data.tokenlist:
if token.str == 'case' and token.scope.type != 'Switch':
reportError(token, 16, 2)
def misra_16_3(rawTokens):
STATE_NONE = 0 # default state, not in switch case/default block
STATE_BREAK = 1 # break/comment is seen but not its ';'
STATE_OK = 2 # a case/default is allowed (we have seen 'break;'/'comment'/'{'/attribute)
state = STATE_NONE
for token in rawTokens:
if token.str == 'break' or token.str == 'return' or token.str == 'throw':
state = STATE_BREAK
elif token.str == ';':
if state == STATE_BREAK:
state = STATE_OK
else:
state = STATE_NONE
elif token.str.startswith('/*') or token.str.startswith('//'):
if 'fallthrough' in token.str.lower():
state = STATE_OK
elif simpleMatch(token, '[ [ fallthrough ] ] ;'):
state = STATE_BREAK
elif token.str == '{':
state = STATE_OK
elif token.str == '}' and state == STATE_OK:
# is this {} an unconditional block of code?
link = findRawLink(token)
if (link is None) or (link.previous is None) or (link.previous.str not in ':;{}'):
state = STATE_NONE
elif token.str == 'case' or token.str == 'default':
if state != STATE_OK:
reportError(token, 16, 3)
state = STATE_OK
def misra_16_4(data):
for token in data.tokenlist:
if token.str != 'switch':
continue
if not simpleMatch(token, 'switch ('):
continue
if not simpleMatch(token.next.link, ') {'):
continue
startTok = token.next.link.next
tok = startTok.next
while tok and tok.str != '}':
if tok.str == '{':
tok = tok.link
elif tok.str == 'default':
break
tok = tok.next
if tok and tok.str != 'default':
reportError(token, 16, 4)
def misra_16_5(data):
for token in data.tokenlist:
if token.str != 'default':
continue
if token.previous and token.previous.str == '{':
continue
tok2 = token
while tok2:
if tok2.str in {'}', 'case'}:
break
if tok2.str == '{':
tok2 = tok2.link
tok2 = tok2.next
if tok2 and tok2.str == 'case':
reportError(token, 16, 5)
def misra_16_6(data):
for token in data.tokenlist:
if not (simpleMatch(token, 'switch (') and simpleMatch(token.next.link, ') {')):
continue
tok = token.next.link.next.next
count = 0
while tok:
if tok.str in ['break', 'return', 'throw']:
count = count + 1
elif tok.str == '{':
tok = tok.link
if isNoReturnScope(tok):
count = count + 1
elif tok.str == '}':
break
tok = tok.next
if count < 2:
reportError(token, 16, 6)
def misra_16_7(data):
for token in data.tokenlist:
if simpleMatch(token, 'switch (') and isBoolExpression(token.next.astOperand2):
reportError(token, 16, 7)
def misra_17_1(data):
for token in data.tokenlist:
if isFunctionCall(token) and token.astOperand1.str in {'va_list', 'va_arg', 'va_start', 'va_end', 'va_copy'}:
reportError(token, 17, 1)
elif token.str == 'va_list':
reportError(token, 17, 1)
def misra_17_6(rawTokens):
for token in rawTokens:
if simpleMatch(token, '[ static'):
reportError(token, 17, 6)
def misra_17_8(data):
for token in data.tokenlist:
if not (token.isAssignmentOp or (token.str in {'++', '--'})):
continue
if not token.astOperand1:
continue
var = token.astOperand1.variable
if var and var.isArgument:
reportError(token, 17, 8)
def misra_18_5(data):
for var in data.variables:
if not var.isPointer:
continue
typetok = var.nameToken
count = 0
while typetok:
if typetok.str == '*':
count = count + 1
elif not typetok.isName:
break
typetok = typetok.previous
if count > 2:
reportError(var.nameToken, 18, 5)
def misra_18_8(data):
for var in data.variables:
if not var.isArray or not var.isLocal:
continue
# TODO Array dimensions are not available in dump, must look in tokens
typetok = var.nameToken.next
if not typetok or typetok.str != '[':
continue
if not isConstantExpression(typetok.astOperand2):
reportError(var.nameToken, 18, 8)
def misra_19_2(data):
for token in data.tokenlist:
if token.str == 'union':
reportError(token, 19, 2)
def misra_20_1(data):
for directive in data.directives:
if not directive.str.startswith('#include'):
continue
for token in data.tokenlist:
if token.file != directive.file:
continue
if int(token.linenr) < int(directive.linenr):
reportError(directive, 20, 1)
break
def misra_20_2(data):
for directive in data.directives:
if not directive.str.startswith('#include '):
continue
for pattern in {'\\', '//', '/*', "'"}:
if pattern in directive.str:
reportError(directive, 20, 2)
break
def misra_20_3(rawTokens):
linenr = -1
for token in rawTokens:
if token.str.startswith('/') or token.linenr == linenr:
continue
linenr = token.linenr
if not simpleMatch(token, '# include'):
continue
headerToken = token.next.next
if not headerToken or not (headerToken.str.startswith('<') or headerToken.str.startswith('"')):
reportError(token, 20, 3)
def misra_20_4(data):
for directive in data.directives:
res = re.search(r'#define ([a-z][a-z0-9_]+)', directive.str)
if res and (res.group(1) in KEYWORDS):
reportError(directive, 20, 4)
def misra_20_5(data):
for directive in data.directives:
if directive.str.startswith('#undef '):
reportError(directive, 20, 5)
def misra_20_13(data):
for directive in data.directives:
dir = directive.str
if dir.find(' ') > 0:
dir = dir[:dir.find(' ')]
if dir.find('(') > 0:
dir = dir[:dir.find('(')]
if dir not in ['#define', '#elif', '#else', '#endif', '#error', '#if', '#ifdef', '#ifndef', '#include', '#pragma', '#undef', '#warning']:
reportError(directive, 20, 13)
def misra_20_14(data):
# stack for #if blocks. contains the #if directive until the corresponding #endif is seen.
# the size increases when there are inner #if directives.
ifStack = []
for directive in data.directives:
if directive.str.startswith('#if '):
ifStack.append(directive)
elif directive.str == '#else' or directive.str.startswith('#elif '):
if len(ifStack)==0:
reportError(directive, 20, 14)
ifStack.append(directive)
elif directive.file != ifStack[-1].file:
reportError(directive, 20, 14)
elif directive.str == '#endif':
if len(ifStack) == 0:
reportError(directive, 20, 14)
elif directive.file != ifStack[-1].file:
reportError(directive, 20, 14)
ifStack.pop()
def misra_21_3(data):
for token in data.tokenlist:
if isFunctionCall(token) and (token.astOperand1.str in {'malloc', 'calloc', 'realloc', 'free'}):
reportError(token, 21, 3)
def misra_21_4(data):
directive = findInclude(data.directives, '<setjmp.h>')
if directive:
reportError(directive, 21, 4)
def misra_21_5(data):
directive = findInclude(data.directives, '<signal.h>')
if directive:
reportError(directive, 21, 5)
def misra_21_7(data):
for token in data.tokenlist:
if isFunctionCall(token) and (token.astOperand1.str in {'atof', 'atoi', 'atol', 'atoll'}):
reportError(token, 21, 7)
def misra_21_8(data):
for token in data.tokenlist:
if isFunctionCall(token) and (token.astOperand1.str in {'abort', 'getenv', 'system'}):
reportError(token, 21, 8)
def misra_21_9(data):
for token in data.tokenlist:
if (token.str in {'bsearch', 'qsort'}) and token.next and token.next.str == '(':
reportError(token, 21, 9)
def misra_21_11(data):
directive = findInclude(data.directives, '<tgmath.h>')
if directive:
reportError(directive, 21, 11)
def loadRuleTexts(filename):
num1 = 0
num2 = 0
appendixA = False
ruleText = False
global ruleTexts
for line in open(filename, 'rt'):
line = line.replace('\r', '').replace('\n', '')
if len(line) == 0:
if ruleText:
num1 = 0
num2 = 0
ruleText = False
continue
if not appendixA:
if line.find('Appendix A') >= 0 and line.find('Summary of guidelines') >= 10:
appendixA = True
continue
if line.find('Appendix B') >= 0:
break
res = re.match(r'^Rule ([0-9]+).([0-9]+)', line)
if res:
num1 = int(res.group(1))
num2 = int(res.group(2))
ruleText = False
continue
if re.match(r'^[ ]*(Advisory|Required|Mandatory)$', line):
ruleText = False
elif re.match(r'^[#A-Z].*', line):
if ruleText:
num2 = num2 + 1
num = num1 * 100 + num2
ruleTexts[num] = line
ruleText = True
elif ruleText and re.match(r'^[a-z].*', line):
num = num1 * 100 + num2
ruleTexts[num] = ruleTexts[num] + ' ' + line
continue
if len(sys.argv) == 1:
print("""
Syntax: misra.py [OPTIONS] <dumpfiles>
OPTIONS:
--rule-texts=<file> Load rule texts from plain text file.
If you have the tool 'pdftotext' you might be able
to generate this textfile with such command:
$ pdftotext MISRA_C_2012.pdf MISRA_C_2012.txt
Otherwise you can more or less copy/paste the chapter
Appendix A Summary of guidelines
from the MISRA pdf. You can buy the MISRA pdf from
http://www.misra.org.uk/
Format:
<..arbitrary text..>
Appendix A Summary of guidelines
Rule 1.1
Rule text for 1.1
Rule 1.2
Rule text for 1.2
<...>
""")
sys.exit(1)
def generateTable():
numberOfRules = {}
numberOfRules[1] = 3
numberOfRules[2] = 7
numberOfRules[3] = 2
numberOfRules[4] = 2
numberOfRules[5] = 9
numberOfRules[6] = 2
numberOfRules[7] = 4
numberOfRules[8] = 14
numberOfRules[9] = 5
numberOfRules[10] = 8
numberOfRules[11] = 9
numberOfRules[12] = 4
numberOfRules[13] = 6
numberOfRules[14] = 4
numberOfRules[15] = 7
numberOfRules[16] = 7
numberOfRules[17] = 8
numberOfRules[18] = 8
numberOfRules[19] = 2
numberOfRules[20] = 14
numberOfRules[21] = 12
numberOfRules[22] = 6
# what rules are handled by this addon?
addon = []
for line in open('misra.py'):
res = re.match(r'[ ]+misra_([0-9]+)_([0-9]+)[(].*', line)
if res is None:
continue
addon.append(res.group(1) + '.' + res.group(2))
# rules handled by cppcheck
cppcheck = ['1.3', '2.1', '2.2', '2.4', '2.6', '8.3', '12.2', '13.2', '13.6', '17.5', '18.1', '18.6', '20.6', '22.1', '22.2', '22.4', '22.6']
# rules that can be checked with compilers
compiler = ['1.1', '1.2']
# print table
for i1 in range(1,23):
for i2 in range(1,numberOfRules[i1]+1):
num = str(i1) + '.' + str(i2)
s = ''
if num in addon:
s = 'X (Addon)'
elif num in cppcheck:
s = 'X (Cppcheck)'
num = num + ' '
print(num[:8] + s)
sys.exit(1)
for arg in sys.argv[1:]:
if arg == '-verify':
VERIFY = True
elif arg.startswith('--rule-texts='):
filename = arg[13:]
if not os.path.isfile(filename):
print('Fatal error: file is not found: ' + filename)
sys.exit(1)
loadRuleTexts(filename)
elif ".dump" in arg:
continue
elif arg == "-generate-table":
generateTable()
else:
print('Fatal error: unhandled argument ' + arg)
sys.exit(1)
for arg in sys.argv[1:]:
if not arg.endswith('.dump'):
continue
data = cppcheckdata.parsedump(arg)
CHAR_BIT = data.platform.char_bit
SHORT_BIT = data.platform.short_bit
INT_BIT = data.platform.int_bit
LONG_BIT = data.platform.long_bit
LONG_LONG_BIT = data.platform.long_long_bit
POINTER_BIT = data.platform.pointer_bit
if VERIFY:
VERIFY_ACTUAL = []
VERIFY_EXPECTED = []
for tok in data.rawTokens:
if tok.str.startswith('//') and 'TODO' not in tok.str:
for word in tok.str[2:].split(' '):
if re.match(r'[0-9]+\.[0-9]+', word):
VERIFY_EXPECTED.append(str(tok.linenr) + ':' + word)
else:
print('Checking ' + arg + '...')
cfgNumber = 0
for cfg in data.configurations:
cfgNumber = cfgNumber + 1
if len(data.configurations) > 1:
print('Checking ' + arg + ', config "' + cfg.name + '"...')
if cfgNumber == 1:
misra_3_1(data.rawTokens)
misra_4_1(data.rawTokens)
misra_5_1(cfg)
misra_5_3(cfg)
misra_5_4(cfg)
misra_5_5(cfg)
# 6.1 require updates in Cppcheck (type info for bitfields are lost)
# 6.2 require updates in Cppcheck (type info for bitfields are lost)
if cfgNumber == 1:
misra_7_1(data.rawTokens)
misra_7_3(data.rawTokens)
misra_8_11(cfg)
misra_8_12(cfg)
if cfgNumber == 1:
misra_8_14(data.rawTokens)
misra_9_5(data.rawTokens)
misra_10_4(cfg)
misra_10_6(cfg)
misra_10_8(cfg)
misra_11_3(cfg)
misra_11_4(cfg)
misra_11_5(cfg)
misra_11_6(cfg)
misra_11_7(cfg)
misra_11_8(cfg)
misra_11_9(cfg)
if cfgNumber == 1:
misra_12_1_sizeof(data.rawTokens)
misra_12_1(cfg)
misra_12_2(cfg)
misra_12_3(cfg)
misra_12_4(cfg)
misra_13_1(cfg)
misra_13_3(cfg)
misra_13_4(cfg)
misra_13_5(cfg)
misra_13_6(cfg)
misra_14_1(cfg)
misra_14_2(cfg)
misra_14_4(cfg)
misra_15_1(cfg)
misra_15_2(cfg)
misra_15_3(cfg)
misra_15_5(cfg)
if cfgNumber == 1:
misra_15_6(data.rawTokens)
misra_15_7(cfg)
misra_16_2(cfg)
if cfgNumber == 1:
misra_16_3(data.rawTokens)
misra_16_4(cfg)
misra_16_5(cfg)
misra_16_6(cfg)
misra_16_7(cfg)
misra_17_1(cfg)
if cfgNumber == 1:
misra_17_6(data.rawTokens)
misra_17_8(cfg)
misra_18_5(cfg)
misra_18_8(cfg)
misra_19_2(cfg)
misra_20_1(cfg)
misra_20_2(cfg)
if cfgNumber == 1:
misra_20_3(data.rawTokens)
misra_20_4(cfg)
misra_20_5(cfg)
misra_20_13(cfg)
misra_20_14(cfg)
misra_21_3(cfg)
misra_21_4(cfg)
misra_21_5(cfg)
misra_21_7(cfg)
misra_21_8(cfg)
misra_21_9(cfg)
misra_21_11(cfg)
if VERIFY:
exitCode = 0
for expected in VERIFY_EXPECTED:
if expected not in VERIFY_ACTUAL:
print('Expected but not seen: ' + expected)
exitCode = 1
for actual in VERIFY_ACTUAL:
if actual not in VERIFY_EXPECTED:
print('Not expected: ' + actual)
exitCode = 1
sys.exit(exitCode)
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