756 lines
22 KiB
Python
756 lines
22 KiB
Python
#/usr/bin/python
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#
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# MISRA C 2012 checkers
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#
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# Example usage of this addon (scan a sourcefile main.cpp)
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# cppcheck --dump main.cpp
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# python misra.py main.cpp.dump
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#
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# Limitations: This addon is released as open source. Rule texts can't be freely
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# distributed. https://www.misra.org.uk/forum/viewtopic.php?f=56&t=1189
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#
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# Total number of rules: 153
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import cppcheckdata
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import sys
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import re
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VERIFY = False
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VERIFY_EXPECTED = []
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VERIFY_ACTUAL = []
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def reportError(location, num1, num2):
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if VERIFY:
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VERIFY_ACTUAL.append(str(location.linenr) + ':' + str(num1) + '.' + str(num2))
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else:
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sys.stderr.write('[' + location.file + ':' + str(location.linenr) + '] misra ' + str(num1) + '.' + str(num2) + ' violation\n')
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def simpleMatch(token, pattern):
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for p in pattern.split(' '):
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if not token or token.str != p:
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return False
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token = token.next
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return True
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# Platform
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# TODO get this from dump
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CHAR_BITS = 8
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SHORT_BITS = 16
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INT_BITS = 32
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KEYWORDS = ['auto',
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'break',
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'case',
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'char',
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'const',
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'continue',
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'default',
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'do',
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'double',
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'else',
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'enum',
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'extern',
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'float',
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'for',
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'goto',
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'if',
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'int',
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'long',
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'register',
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'return',
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'short',
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'signed',
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'sizeof',
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'static',
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'struct',
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'switch',
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'typedef',
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'union',
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'unsigned',
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'void',
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'volatile',
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'while']
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def getEssentialType(expr):
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if not expr:
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return None
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if expr.variable:
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typeToken = expr.variable.typeStartToken
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while typeToken and typeToken.isName:
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if typeToken.str in ['char', 'short', 'int', 'long', 'float', 'double']:
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return typeToken.str
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typeToken = typeToken.next
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return None
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def bitsOfEssentialType(expr):
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type = getEssentialType(expr)
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if type is None:
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return 0
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# TODO get --platform type sizes
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if type == 'char':
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return CHAR_BITS
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if type == 'short':
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return SHORT_BITS
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if type == 'int':
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return INT_BITS
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return 0
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def isFunctionCall(expr):
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if not expr:
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return False
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if expr.str != '(' or not expr.astOperand1:
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return False
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if expr.astOperand1 != expr.previous:
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return False
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if expr.astOperand1.str in KEYWORDS:
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return False
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return True
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def countSideEffects(expr):
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if not expr or expr.str in [',', ';']:
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return 0
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ret = 0
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if expr.str in ['++', '--', '=']:
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ret = 1
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return ret + countSideEffects(expr.astOperand1) + countSideEffects(expr.astOperand2)
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def getForLoopExpressions(forToken):
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if not forToken or forToken.str != 'for':
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return None
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lpar = forToken.next
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if not lpar or lpar.str != '(':
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return None
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if not lpar.astOperand2 or lpar.astOperand2.str != ';':
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return None
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if not lpar.astOperand2.astOperand2 or lpar.astOperand2.astOperand2.str != ';':
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return None
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return [lpar.astOperand2.astOperand1, lpar.astOperand2.astOperand2.astOperand1, lpar.astOperand2.astOperand2.astOperand2]
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def hasFloatComparison(expr):
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if not expr:
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return False
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if expr.isLogicalOp:
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return hasFloatComparison(expr.astOperand1) or hasFloatComparison(expr.astOperand2)
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if expr.isComparisonOp:
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# TODO: Use ValueType
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return cppcheckdata.astIsFloat(expr.astOperand1) or cppcheckdata.astIsFloat(expr.astOperand2)
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return False
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def hasSideEffectsRecursive(expr):
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if not expr:
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return False
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if expr.str in ['++', '--', '=']:
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return True
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# Todo: Check function calls
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return hasSideEffectsRecursive(expr.astOperand1) or hasSideEffectsRecursive(expr.astOperand2)
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def isBoolExpression(expr):
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return expr and expr.str in ['!', '==', '!=', '<', '<=', '>', '>=', '&&', '||']
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def isConstantExpression(expr):
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if expr.isNumber:
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return True
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if expr.isName:
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return False
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if simpleMatch(expr.previous, 'sizeof ('):
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return True
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if expr.astOperand1 and not isConstantExpression(expr.astOperand1):
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return False
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if expr.astOperand2 and not isConstantExpression(expr.astOperand2):
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return False
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return True
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def isUnsignedInt(expr):
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# TODO this function is very incomplete. use ValueType?
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if not expr:
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return False
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if expr.isNumber:
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return expr.str.find('u')>0 or expr.str.find('U')>0
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if expr.str in ['+','-','*','/','%']:
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return isUnsignedInt(expr.astOperand1) or isUnsignedInt(expr.astOperand2)
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return False
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def getPrecedence(expr):
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if not expr:
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return 16
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if not expr.astOperand1 or not expr.astOperand2:
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return 16
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if expr.str in ['*', '/', '%']:
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return 12
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if expr.str in ['+', '-']:
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return 11
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if expr.str in ['<<', '>>']:
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return 10
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if expr.str in ['<', '>', '<=', '>=']:
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return 9
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if expr.str in ['==', '!=']:
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return 8
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if expr.str == '&':
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return 7
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if expr.str == '^':
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return 6
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if expr.str == '|':
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return 5
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if expr.str == '&&':
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return 4
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if expr.str == '||':
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return 3
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if expr.str in ['?',':']:
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return 2
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if expr.isAssignmentOp:
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return 1
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if expr.str == ',':
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return 0
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return -1
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def noParentheses(tok1, tok2):
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while tok1 and tok1 != tok2:
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if tok1.str == '(' or tok1.str == ')':
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return False
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tok1 = tok1.next
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return tok1 == tok2
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def findGotoLabel(gotoToken):
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label = gotoToken.next.str
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tok = gotoToken.next.next
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while tok:
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if tok.str == '}' and tok.scope.type == 'Function':
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break
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if tok.str == label and tok.next.str == ':':
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return tok
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tok = tok.next
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return None
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def findInclude(directives, header):
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for directive in directives:
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if directive.str == '#include ' + header:
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return directive
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return None
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def misra_5_1(data):
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for token in data.tokenlist:
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if token.isName and len(token.str) > 31:
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reportError(token, 5, 1)
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def misra_7_1(rawTokens):
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for tok in rawTokens:
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if re.match(r'^0[0-7]+$', tok.str):
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reportError(tok, 7, 1)
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def misra_7_3(rawTokens):
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for tok in rawTokens:
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if re.match(r'^[0-9]+l', tok.str):
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reportError(tok, 7, 3)
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def misra_12_1_sizeof(rawTokens):
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state = 0
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for tok in rawTokens:
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if tok.str.startswith('//') or tok.str.startswith('/*'):
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continue
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if tok.str == 'sizeof':
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state = 1
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elif state == 1:
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if re.match(r'^[a-zA-Z_]',tok.str):
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state = 2
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else:
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state = 0
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elif state == 2:
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if tok.str in ['+','-','*','/','%']:
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reportError(tok, 12, 1)
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else:
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state = 0
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def misra_12_1(data):
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for token in data.tokenlist:
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p = getPrecedence(token)
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if p < 2 or p > 12:
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continue
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p1 = getPrecedence(token.astOperand1)
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if p1 <= 12 and p1 > p and noParentheses(token.astOperand1,token):
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reportError(token, 12, 1)
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continue
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p2 = getPrecedence(token.astOperand2)
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if p2 <= 12 and p2 > p and noParentheses(token, token.astOperand2):
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reportError(token, 12, 1)
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continue
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def misra_12_2(data):
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for token in data.tokenlist:
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if not (token.str in ['<<','>>']):
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continue
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if (not token.astOperand2) or (not token.astOperand2.values):
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continue
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maxval = 0
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for val in token.astOperand2.values:
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if val.intvalue > maxval:
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maxval = val.intvalue
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if maxval == 0:
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continue
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sz = bitsOfEssentialType(token.astOperand1)
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if sz <= 0:
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continue
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if maxval >= sz:
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reportError(token, 12, 2)
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def misra_12_3(data):
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for token in data.tokenlist:
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if token.str != ',':
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continue
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if token.astParent and (token.astParent.str in ['(', ',', '{']):
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continue
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reportError(token, 12, 3)
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def misra_12_4(data):
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max_uint = 0
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if INT_BITS == 16:
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max_uint = 0xffff
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elif INT_BITS == 32:
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max_uint = 0xffffffff
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else:
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return
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for token in data.tokenlist:
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if (not isConstantExpression(token)) or (not isUnsignedInt(token)):
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continue
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if not token.values:
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continue
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for value in token.values:
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if value.intvalue < 0 or value.intvalue > max_uint:
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reportError(token, 12, 4)
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break
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def misra_13_1(data):
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for token in data.tokenlist:
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if token.str != '=':
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continue
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init = token.next
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if init and init.str == '{' and hasSideEffectsRecursive(init):
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reportError(init,13,1)
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def misra_13_3(data):
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for token in data.tokenlist:
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if not token.astOperand1:
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continue
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if token.astParent and token.astParent.str != ',':
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continue
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if token.str == ',':
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continue
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if countSideEffects(token) >= 2:
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reportError(token, 13, 3)
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def misra_13_4(data):
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for token in data.tokenlist:
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if token.str != '=':
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continue
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if not token.astParent:
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continue
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if not (token.astParent.str in [',', ';']):
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reportError(token, 13, 4)
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def misra_13_5(data):
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for token in data.tokenlist:
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if token.isLogicalOp and hasSideEffectsRecursive(token.astOperand2):
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reportError(token, 13, 5)
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def misra_13_6(data):
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for token in data.tokenlist:
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if token.str == 'sizeof' and hasSideEffectsRecursive(token.next):
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reportError(token, 13, 6)
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def misra_14_1(data):
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for token in data.tokenlist:
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if token.str != 'for':
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continue
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exprs = getForLoopExpressions(token)
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if exprs and hasFloatComparison(exprs[1]):
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reportError(token, 14, 1)
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def misra_14_2(data):
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for token in data.tokenlist:
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expressions = getForLoopExpressions(token)
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if not expressions:
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continue
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if expressions[0] and not expressions[0].isAssignmentOp:
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reportError(token, 14, 2)
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elif hasSideEffectsRecursive(expressions[1]):
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reportError(token, 14, 2)
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def misra_14_4(data):
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for token in data.tokenlist:
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if token.str != '(':
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continue
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if not token.astOperand1 or not (token.astOperand1.str in ['if', 'while']):
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continue
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if not isBoolExpression(token.astOperand2):
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reportError(token, 14, 4)
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def misra_15_1(data):
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for token in data.tokenlist:
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if token.str == "goto":
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reportError(token, 15, 1)
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def misra_15_2(data):
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for token in data.tokenlist:
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if token.str != 'goto':
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continue
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if (not token.next) or (not token.next.isName):
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continue
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if not findGotoLabel(token):
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reportError(token, 15, 2)
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def misra_15_3(data):
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for token in data.tokenlist:
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if token.str != 'goto':
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continue
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if (not token.next) or (not token.next.isName):
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continue
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tok = findGotoLabel(token)
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if not tok:
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continue
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scope = token.scope
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while scope and scope != tok.scope:
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scope = scope.nestedIn
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if not scope:
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reportError(token, 15, 3)
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def misra_15_5(data):
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for token in data.tokenlist:
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if token.str == 'return' and token.scope.type != 'Function':
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reportError(token, 15, 5)
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def misra_15_6(rawTokens):
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state = 0
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indent = 0
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for token in rawTokens:
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if token.str in ['if', 'for', 'while']:
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state = 1
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indent = 0
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elif state == 1:
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if token.str == '(':
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indent = indent + 1
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elif token.str == ')':
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if indent == 0:
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state = 0
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elif indent == 1:
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state = 2
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indent = indent - 1
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elif state == 2:
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if token.str.startswith('//') or token.str.startswith('/*'):
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continue
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state = 0
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if token.str != '{':
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reportError(token, 15, 6)
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def misra_15_7(data):
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for token in data.tokenlist:
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if not simpleMatch(token, 'if ('):
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continue
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if not simpleMatch(token.next.link, ') {'):
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continue
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if not simpleMatch(token.next.link.next.link, '} else'):
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reportError(token, 15, 7)
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# TODO add 16.1 rule
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def misra_16_2(data):
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for token in data.tokenlist:
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if token.str == 'case' and token.scope.type != 'Switch':
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reportError(token, 16, 2)
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def misra_16_3(rawTokens):
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# state: 0=no, 1=break is seen but not its ';', 2=after 'break;', 'comment', '{'
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state = 0
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for token in rawTokens:
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if token.str == 'break':
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state = 1
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elif token.str == ';':
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if state == 1:
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state = 2
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else:
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state = 0
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elif token.str.startswith('/*') or token.str.startswith('//'):
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if token.str.lower().find('fallthrough')>0:
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state = 2
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elif token.str == '{':
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state = 2
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elif token.str == 'case' and state != 2:
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reportError(token, 16, 3)
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def misra_16_4(data):
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for token in data.tokenlist:
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if token.str != 'switch':
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continue
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if not simpleMatch(token, 'switch ('):
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continue
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if not simpleMatch(token.next.link, ') {'):
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continue
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startTok = token.next.link.next
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tok = startTok.next
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while tok and tok.str != '}':
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if tok.str == '{':
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tok = tok.link
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elif tok.str == 'default':
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break
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tok = tok.next
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if tok and tok.str != 'default':
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reportError(token, 16, 4)
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def misra_16_5(data):
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for token in data.tokenlist:
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if token.str != 'default':
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continue
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if token.previous and token.previous.str == '{':
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continue
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tok2 = token
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while tok2:
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if tok2.str in ['}', 'case']:
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break
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if tok2.str == '{':
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tok2 = tok2.link
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tok2 = tok2.next
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if tok2 and tok2.str == 'case':
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reportError(token, 16, 5)
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def misra_16_6(data):
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for token in data.tokenlist:
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if not (simpleMatch(token, 'switch (') and simpleMatch(token.next.link, ') {')):
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continue
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tok = token.next.link.next.next
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count = 0
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while tok:
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if tok.str == 'break':
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count = count + 1
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elif tok.str == '{':
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tok = tok.link
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elif tok.str == '}':
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break
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tok = tok.next
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if count < 2:
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reportError(token, 16, 6)
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def misra_16_7(data):
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for token in data.tokenlist:
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if simpleMatch(token, 'switch (') and isBoolExpression(token.next.astOperand2):
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reportError(token, 16, 7)
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def misra_17_1(data):
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for token in data.tokenlist:
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if isFunctionCall(token) and token.astOperand1.str in ['va_list', 'va_arg', 'va_start', 'va_end' , 'va_copy']:
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reportError(token, 17, 1)
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def misra_17_6(rawTokens):
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|
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:
|
|
continue
|
|
# TODO Array dimensions are not available in dump
|
|
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 directive.str.find(pattern)>0:
|
|
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_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)
|
|
|
|
if '-verify' in sys.argv[1:]:
|
|
VERIFY = True
|
|
|
|
for arg in sys.argv[1:]:
|
|
if not arg.endswith('.dump'):
|
|
continue
|
|
|
|
data = cppcheckdata.parsedump(arg)
|
|
|
|
if VERIFY:
|
|
VERIFY_ACTUAL = []
|
|
VERIFY_EXPECTED = []
|
|
for tok in data.rawTokens:
|
|
if tok.str.startswith('//') and tok.str.find('TODO')<0:
|
|
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 + '"...')
|
|
|
|
misra_5_1(cfg)
|
|
if cfgNumber == 1:
|
|
misra_7_1(data.rawTokens)
|
|
misra_7_3(data.rawTokens)
|
|
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_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:
|
|
for expected in VERIFY_EXPECTED:
|
|
if not expected in VERIFY_ACTUAL:
|
|
print('Expected but not seen: ' + expected)
|
|
sys.exit(1)
|
|
for actual in VERIFY_ACTUAL:
|
|
if not actual in VERIFY_EXPECTED:
|
|
print('Not expected: ' + actual)
|
|
sys.exit(1)
|