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cppcheck/lib/tokenize.h

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2011 Daniel Marjamäki and Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
//---------------------------------------------------------------------------
#ifndef tokenizeH
#define tokenizeH
//---------------------------------------------------------------------------
#include <string>
#include <map>
#include <list>
#include <vector>
#include <set>
class Token;
class ErrorLogger;
class Settings;
class SymbolDatabase;
/// @addtogroup Core
/// @{
/** @brief The main purpose is to tokenize the source code. It also has functions that simplify the token list */
class Tokenizer
{
private:
/** Deallocate lists */
void deallocateTokens();
public:
Tokenizer();
Tokenizer(const Settings * settings, ErrorLogger *errorLogger);
virtual ~Tokenizer();
/** Is the code JAVA/C#. Used for bailouts */
bool isJavaOrCSharp() const
{
if (_files.size() != 1)
return false;
const std::string::size_type pos = _files[0].rfind(".");
if (pos != std::string::npos)
return (_files[0].substr(pos) == ".java" ||
_files[0].substr(pos) == ".cs");
return false;
}
/**
* Tokenize code
* @param code input stream for code, e.g.
* \code
* #file "p.h"
* class Foo
* {
* private:
* void Bar();
* };
*
* #endfile
* void Foo::Bar()
* {
* }
* \endcode
*
* @param FileName The filename
* @param configuration E.g. "A" for code where "#ifdef A" is true
* @param preprocessorCondition Set this flag to true if the code is a preprocessor condition. It disables some simplifications
* @return false if source code contains syntax errors
*/
bool tokenize(std::istream &code,
const char FileName[],
const std::string &configuration = "",
const bool preprocessorCondition = false);
/**
* Create tokens from code.
* The code must be preprocessed first:
* - multiline strings are not handled.
* - UTF in the code are not handled.
* - comments are not handled.
* @param code input stream for code
*/
void createTokens(std::istream &code);
/** Set variable id */
void setVarId();
/**
* Simplify tokenlist
*
* @return false if there is an error that requires aborting
* the checking of this file.
*/
bool simplifyTokenList();
/**
* Delete all tokens in given token list
* @param tok token list to delete
*/
static void deleteTokens(Token *tok);
/**
* Simplify '* & %any% =' to '%any% ='
*/
void simplifyMulAnd(void);
/**
* Get parameter name of function
* @param ftok The token for the function name in a function
* implementation/declaration
* @param par parameter number (1,2,3,..)
* @return if the parameter was found then the parameter name is
* returned. Otherwise NULL is returned.
*/
static const char *getParameterName(const Token *ftok, unsigned int par);
/**
* Get file:line for a given token
* @param tok given token
* @return location for given token
*/
std::string fileLine(const Token *tok) const;
/**
* Calculates sizeof value for given type.
* @param type Token which will contain e.g. "int", "*", or string.
* @return sizeof for given type, or 0 if it can't be calculated.
*/
unsigned int sizeOfType(const Token *type) const;
/**
* Get filenames (the sourcefile + the files it include).
* The first filename is the filename for the sourcefile
* @return vector with filenames
*/
const std::vector<std::string> *getFiles() const;
/** recreate symbol database */
void fillFunctionList();
/**
* Get function token by function name
* @todo better handling of overloaded functions
* @todo only scan parent scopes
* @param funcname function name
*/
const Token *getFunctionTokenByName(const char funcname[]) const;
/** get tokens */
const Token *tokens() const;
/**
* get filename for given token
* @param tok The given token
* @return filename for the given token
*/
std::string file(const Token *tok) const;
/**
* get error messages that the tokenizer generate
*/
virtual void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings);
/** Simplify assignment in function call "f(x=g());" => "x=g();f(x);"
*/
void simplifyAssignmentInFunctionCall();
/**
* Simplify constant calculations such as "1+2" => "3"
* @return true if modifications to token-list are done.
* false if no modifications are done.
*/
bool simplifyCalculations();
/** Insert array size where it isn't given */
void arraySize();
/** Simplify labels */
void labels();
/** Remove macros in global scope */
void removeMacrosInGlobalScope();
/** Remove redundant assignment */
void removeRedundantAssignment();
/** Remove redudant code after return */
void removeRedundantCodeAfterReturn();
/**
* Replace sizeof() to appropriate size.
*/
void simplifySizeof();
/**
* Simplify variable declarations (split up)
*/
void simplifyVarDecl();
/**
* Simplify variable initialization
* ; int *p(0);
* =>
* ; int *p = 0;
*/
void simplifyInitVar();
Token * initVar(Token * tok);
/**
* Collapse compound standard types into a single token.
* unsigned long long int => long _isUnsigned=true,_isLong=true
*/
void simplifyStdType();
/**
* Simplify question mark - colon operator
* Example: 0 ? (2/0) : 0 => 0
* @return true if something is modified
* false if nothing is done.
*/
bool simplifyQuestionMark();
/**
* Simplify compound assignments
* Example: ";a+=b;" => ";a=a+b;"
*/
void simplifyCompoundAssignment();
/**
* simplify if-assignments
* Example: "if(a=b);" => "a=b;if(a);"
*/
void simplifyIfAssign();
/**
* Simplify multiple assignments.
* Example: "a = b = c = 0;" => "a = 0; b = 0; c = 0;"
*/
void simplifyVariableMultipleAssign();
/**
* simplify if-not
* Example: "if(0==x);" => "if(!x);"
*/
void simplifyIfNot();
/**
* simplify if-not NULL
* Example: "if(0!=x);" => "if(x);"
* Special case: 'x = (0 != x);' is removed.
*/
void simplifyIfNotNull();
/** @brief simplify if (a) { if (a) */
void simplifyIfSameInnerCondition();
/**
* Simplify the "not" and "and" keywords to "!" and "&&"
* accordingly.
* Examples:
* - "if (not p)" => "if (!p)"
* - "if (p and q)" => "if (p && q)"
*/
bool simplifyLogicalOperators();
/**
* Simplify comma into a semicolon when possible:
* - "delete a, delete b" => "delete a; delete b;"
* - "a = 0, b = 0;" => "a = 0; b = 0;"
* - "return a(), b;" => "a(); return b;"
*/
void simplifyComma();
/** Add braces to an if-block
* @return true if no syntax errors
*/
bool simplifyIfAddBraces();
/**
* Add braces to an do-while block
*/
void simplifyDoWhileAddBraces();
/**
* typedef A mytype;
* mytype c;
*
* Becomes:
* typedef A mytype;
* A c;
*/
void simplifyTypedef();
/**
* Simplify casts
*/
void simplifyCasts();
/**
* A simplify function that replaces a variable with its value in cases
* when the value is known. e.g. "x=10; if(x)" => "x=10;if(10)"
*
* @return true if modifications to token-list are done.
* false if no modifications are done.
*/
bool simplifyKnownVariables();
/**
* Utility function for simplifyKnownVariables. Get data about an
* assigned variable.
*/
bool simplifyKnownVariablesGetData(unsigned int varid, Token **_tok2, Token **_tok3, std::string &value, unsigned int &valueVarId, bool &valueIsPointer, bool floatvar);
/**
* utility function for simplifyKnownVariables. Perform simplification
* of a given variable
*/
bool simplifyKnownVariablesSimplify(Token **tok2, Token *tok3, unsigned int varid, const std::string &structname, std::string &value, unsigned int valueVarId, bool valueIsPointer, const Token * const valueToken, int indentlevel);
/** Replace a "goto" with the statements */
void simplifyGoto();
/** Expand nested strcat() calls. */
void simplifyNestedStrcat();
/** Simplify "if else" */
void elseif();
void addtoken(const char str[], const unsigned int lineno, const unsigned int fileno, bool split = false);
void addtoken(const Token *tok, const unsigned int lineno, const unsigned int fileno);
/**
* Simplify the operator "?:"
*/
void simplifyConditionOperator();
/** Simplify conditions
* @return true if something is modified
* false if nothing is done.
*/
bool simplifyConditions();
/** Remove redundant code, e.g. if( false ) { int a; } should be
* removed, because it is never executed.
* @return true if something is modified
* false if nothing is done.
*/
bool removeReduntantConditions();
/**
* Remove redundant for:
* "for (x=0;x<1;x++) { }" => "{ x = 1; }"
*/
void removeRedundantFor();
/**
* Reduces "; ;" to ";", except in "( ; ; )"
*/
void removeRedundantSemicolons();
/** Simplify function calls - constant return value
* @return true if something is modified
* false if nothing is done.
*/
bool simplifyFunctionReturn();
/** Struct initialization */
void simplifyStructInit();
/** Struct simplification
* "struct S { } s;" => "struct S { }; S s;"
*/
void simplifyStructDecl();
/**
* Remove redundant parenthesis:
* - "((x))" => "(x)"
* - "(function())" => "function()"
* - "(delete x)" => "delete x"
* - "(delete [] x)" => "delete [] x"
* @return true if modifications to token-list are done.
* false if no modifications are done.
*/
bool simplifyRedundantParenthesis();
/** Simplify references */
void simplifyReference();
/**
* Simplify functions like "void f(x) int x; {"
* into "void f(int x) {"
*/
void simplifyFunctionParameters();
/**
* Simplify templates
*/
void simplifyTemplates();
/**
* Expand specialized templates : "template<>.."
* @return names of expanded templates
*/
std::set<std::string> simplifyTemplatesExpandSpecialized();
/**
* Get template declarations
* @return list of template declarations
*/
std::list<Token *> simplifyTemplatesGetTemplateDeclarations();
/**
* Get template instantiations
* @return list of template instantiations
*/
std::list<Token *> simplifyTemplatesGetTemplateInstantiations();
/**
* simplify template instantiations (use default argument values)
* @param templates list of template declarations
* @param instantiations list of template instantiations
*/
void simplifyTemplatesUseDefaultArgumentValues(const std::list<Token *> &templates,
const std::list<Token *> &instantiations);
/**
* Simplify templates : expand all instantiatiations for a template
* @todo It seems that inner templates should be instantiated recursively
* @param tok token where the template declaration begins
* @param used a list of template usages (not necessarily just for this template)
* @param expandedtemplates all templates that has been expanded so far. The full names are stored.
*/
void simplifyTemplatesInstantiate(const Token *tok,
std::list<Token *> &used,
std::set<std::string> &expandedtemplates);
/**
* Used after simplifyTemplates to perform a little cleanup.
* Sometimes the simplifyTemplates isn't fully successful and then
* there are function calls etc with "wrong" syntax.
*/
void simplifyTemplates2();
/**
* Simplify e.g. 'atol("0")' into '0'
*/
void simplifyMathFunctions();
/**
* Modify strings in the token list by replacing hex and oct
* values. E.g. "\x61" -> "a" and "\000" -> "\0"
* @param source The string to be modified, e.g. "\x61"
* @return Modified string, e.g. "a"
*/
std::string simplifyString(const std::string &source);
/**
* Use "<" comparison instead of ">"
* Use "<=" comparison instead of ">="
*/
void simplifyComparisonOrder();
/**
* Change "int const x;" into "const int x;"
*/
void simplifyConst();
/**
* simplify "while (0)"
*/
void simplifyWhile0();
/**
* Simplify while(func() && errno==EINTR)
*/
void simplifyErrNoInWhile();
/**
* Simplify while(func(f))
*/
void simplifyFuncInWhile();
/**
* Replace enum with constant value
*/
void simplifyEnum();
/**
* Remove "std::" before some function names
*/
void simplifyStd();
/** Simplify function pointers */
void simplifyFunctionPointers();
/**
* Remove exception specifications. This function calls itself recursively.
* @param tok First token in scope to cleanup
*/
void removeExceptionSpecifications(Token *tok) const;
void insertTokens(Token *dest, const Token *src, unsigned int n);
/**
* Copy tokens.
* @param dest destination token where copied tokens will be inserted after
* @param first first token to copy
* @param last last token to copy
* @return new location of last token copied
*/
Token *copyTokens(Token *dest, const Token *first, const Token *last);
/**
* Send error message to error logger about internal bug.
* @param tok the token that this bug concerns.
*/
void cppcheckError(const Token *tok) const;
/**
* Setup links for tokens so that one can call Token::link().
*
* @return false if there was a mismatch with tokens, this
* should mean that source code was not valid.
*/
bool createLinks();
/** Syntax error */
void syntaxError(const Token *tok);
/** Syntax error. Example: invalid number of ')' */
void syntaxError(const Token *tok, char c);
/**
* assert that tokens are ok - used during debugging for example
* to catch problems in simplifyTokenList.
* @return always true.
*/
bool validate() const;
/**
* Helper function for simplifyDoWhileAddBraces()
* @param tok This must be a "do" token, which is
* not followed by "{".
*/
bool simplifyDoWhileAddBracesHelper(Token *tok);
/**
* Remove __declspec()
*/
void simplifyDeclspec();
/**
* Remove calling convention
*/
void simplifyCallingConvention();
/**
* Remove __attribute__ ((?))
*/
void simplifyAttribute();
/**
* Remove keywords "volatile", "inline", "register", and "restrict"
*/
void simplifyKeyword();
/**
* Remove __asm
*/
void simplifyAsm();
/**
* Simplify bitfields - the field width is removed as we don't use it.
*/
void simplifyBitfields();
/**
* Remove __builtin_expect(...), likely(...), and unlikely(...)
*/
void simplifyBuiltinExpect();
/**
* Remove unnecessary member qualification
*/
void removeUnnecessaryQualification();
/**
* unnecessary member qualification error
*/
void unnecessaryQualificationError(const Token *tok, const std::string &qualification);
/**
* Remove Microsoft MFC 'DECLARE_MESSAGE_MAP()'
*/
void simplifyMicrosoftMFC();
/**
* Remove Borland code
*/
void simplifyBorland();
/**
* Remove Qt signals and slots
*/
void simplifyQtSignalsSlots();
/**
* Collapse operator name tokens into single token
* operator = => operator=
*/
void simplifyOperatorName();
/**
* This will return a short name describing function parameters
* e.g. parameters: (int a, char b) should get name "int,char,".
* This should help to identify functions with the same name,
* but with different parameters.
* @param start The "(" token
* @return, e.g. "int,char,"
*/
static std::string getNameForFunctionParams(const Token *start);
/**
* check for duplicate enum definition
*/
bool duplicateDefinition(Token **tokPtr, const Token *name);
/**
* duplicate enum definition error
*/
void duplicateEnumError(const Token *tok1, const Token *tok2, const std::string & type);
bool duplicateTypedef(Token **tokPtr, const Token *name, const Token *typeDef, bool undefinedStruct);
void duplicateTypedefError(const Token *tok1, const Token *tok2, const std::string & type);
/**
* Report error - duplicate declarations
*/
void duplicateDeclarationError(const Token *tok1, const Token *tok2, const std::string &type);
void unsupportedTypedef(const Token *tok) const;
/** Was there templates in the code? */
bool codeWithTemplates() const
{
return _codeWithTemplates;
}
void setSettings(const Settings *settings)
{
_settings = settings;
}
const SymbolDatabase *getSymbolDatabase() const;
Token *deleteInvalidTypedef(Token *typeDef);
/**
* Get variable count.
* @return number of variables
*/
unsigned int varIdCount() const
{
return _varId;
}
/**
* Simplify e.g. 'return(strncat(temp,"a",1));' into
* strncat(temp,"a",1); return temp;
*/
void simplifyReturn();
private:
/** Disable copy constructor, no implementation */
Tokenizer(const Tokenizer &);
/** Disable assignment operator, no implementation */
Tokenizer &operator=(const Tokenizer &);
/** Token list */
Token *_tokens, *_tokensBack;
/** sizeof information for known types */
std::map<std::string, unsigned int> _typeSize;
/** filenames for the tokenized source code (source + included) */
std::vector<std::string> _files;
/** settings */
const Settings * _settings;
/** errorlogger */
ErrorLogger * const _errorLogger;
/** E.g. "A" for code where "#ifdef A" is true. This is used to
print additional information in error situations. */
std::string _configuration;
/**
* was there any templates? templates that are "unused" are
* removed from the token list
*/
bool _codeWithTemplates;
/** Symbol database that all checks etc can use */
mutable SymbolDatabase *_symbolDatabase;
/** variable count */
unsigned int _varId;
};
/// @}
//---------------------------------------------------------------------------
#endif
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