cppcheck/lib/checkclass.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2010 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/>.
*/
//---------------------------------------------------------------------------
#include "checkclass.h"
#include "tokenize.h"
#include "token.h"
#include "errorlogger.h"
#include <locale>
#include <cstring>
#include <string>
#include <sstream>
#include <algorithm>
//---------------------------------------------------------------------------
// Register CheckClass..
namespace
{
CheckClass instance;
}
//---------------------------------------------------------------------------
CheckClass::Var *CheckClass::getVarList(const Token *tok1)
{
// Get variable list..
Var *varlist = NULL;
unsigned int indentlevel = 0;
bool isStruct = tok1->str() == "struct";
bool priv = !isStruct;
for (const Token *tok = tok1; tok; tok = tok->next())
{
if (!tok->next())
break;
if (tok->str() == "{")
++indentlevel;
else if (tok->str() == "}")
{
if (indentlevel <= 1)
break;
--indentlevel;
}
if (indentlevel != 1)
continue;
// Borland C++: Skip all variables in the __published section.
// These are automaticly initialized.
if (tok->str() == "__published:")
{
priv = false;
for (; tok; tok = tok->next())
{
if (tok->str() == "{")
tok = tok->link();
if (Token::Match(tok->next(), "private:|protected:|public:"))
break;
}
if (tok)
continue;
else
break;
}
// "private:" "public:" "protected:" etc
const bool b((tok->str()[0] != ':') && tok->str().find(":") != std::string::npos);
if (b)
priv = bool(tok->str() == "private:");
// Search for start of statement..
if (! Token::Match(tok, "[;{}]") && ! b)
continue;
// This is the start of a statement
const Token *next = tok->next();
std::string varname;
// If next token contains a ":".. it is not part of a variable declaration
if (next->str().find(":") != std::string::npos)
continue;
// Borland C++: Ignore properties..
if (next->str() == "__property")
continue;
// Is it const..?
if (next->str() == "const")
{
next = next->next();
}
// Is it a static variable?
const bool isStatic(Token::simpleMatch(next, "static"));
if (isStatic)
{
next = next->next();
}
// Is it a mutable variable?
const bool isMutable(Token::simpleMatch(next, "mutable"));
if (isMutable)
{
next = next->next();
}
// Is it const..?
if (next->str() == "const")
{
next = next->next();
}
// Is it a variable declaration?
bool isClass = false;
if (Token::Match(next, "%type% %var% ;|:"))
{
if (!next->isStandardType())
isClass = true;
varname = next->strAt(1);
}
// Structure?
else if (Token::Match(next, "struct|union %type% %var% ;"))
{
varname = next->strAt(2);
}
// Pointer?
else if (Token::Match(next, "%type% * %var% ;"))
varname = next->strAt(2);
else if (Token::Match(next, "%type% %type% * %var% ;"))
varname = next->strAt(3);
else if (Token::Match(next, "%type% :: %type% * %var% ;"))
varname = next->strAt(4);
// Array?
else if (Token::Match(next, "%type% %var% [") && next->next()->str() != "operator")
{
if (!next->isStandardType())
isClass = true;
varname = next->strAt(1);
}
// Pointer array?
else if (Token::Match(next, "%type% * %var% ["))
varname = next->strAt(2);
else if (Token::Match(next, "%type% :: %type% * %var% ["))
varname = next->strAt(4);
// std::string..
else if (Token::Match(next, "%type% :: %type% %var% ;"))
{
isClass = true;
varname = next->strAt(3);
}
// Container..
else if (Token::Match(next, "%type% :: %type% <") ||
Token::Match(next, "%type% <"))
{
isClass = true;
// find matching ">"
int level = 0;
for (; next; next = next->next())
{
if (next->str() == "<")
level++;
else if (next->str() == ">")
{
level--;
if (level == 0)
break;
}
}
if (next && Token::Match(next, "> %var% ;"))
varname = next->strAt(1);
2010-05-25 06:55:49 +02:00
else if (next && Token::Match(next, "> * %var% ;"))
varname = next->strAt(2);
}
2010-05-25 06:55:49 +02:00
// If the varname was set in the if-blocks above, create a entry for this variable..
if (!varname.empty() && varname != "operator")
{
Var *var = new Var(varname, false, priv, isMutable, isStatic, isClass, varlist);
varlist = var;
}
}
return varlist;
}
//---------------------------------------------------------------------------
void CheckClass::initVar(Var *varlist, const std::string &varname)
{
for (Var *var = varlist; var; var = var->next)
{
if (var->name == varname)
{
var->init = true;
2010-01-22 19:29:24 +01:00
return;
}
}
}
//---------------------------------------------------------------------------
void CheckClass::initializeVarList(const Token *tok1, const Token *ftok, Var *varlist, const std::string &classname, std::list<std::string> &callstack, bool isStruct)
{
bool Assign = false;
unsigned int indentlevel = 0;
for (; ftok; ftok = ftok->next())
{
if (!ftok->next())
break;
// Class constructor.. initializing variables like this
// clKalle::clKalle() : var(value) { }
if (indentlevel == 0)
{
if (Assign && Token::Match(ftok, "%var% ("))
{
initVar(varlist, ftok->strAt(0));
// assignment in the initializer..
// : var(value = x)
if (Token::Match(ftok->tokAt(2), "%var% ="))
initVar(varlist, ftok->strAt(2));
}
Assign |= (ftok->str() == ":");
}
if (ftok->str() == "{")
{
++indentlevel;
Assign = false;
}
else if (ftok->str() == "}")
{
if (indentlevel <= 1)
break;
--indentlevel;
}
if (indentlevel < 1)
continue;
// Variable getting value from stream?
if (Token::Match(ftok, ">> %var%"))
{
initVar(varlist, ftok->strAt(1));
}
// Before a new statement there is "[{};)=]"
if (! Token::Match(ftok, "[{};()=]"))
continue;
if (Token::simpleMatch(ftok, "( !"))
ftok = ftok->next();
// Using the operator= function to initialize all variables..
if (Token::simpleMatch(ftok->next(), "* this = "))
{
for (Var *var = varlist; var; var = var->next)
var->init = true;
break;
}
if (Token::Match(ftok->next(), "%var% . %var% ("))
ftok = ftok->tokAt(2);
if (!Token::Match(ftok->next(), "%var%") &&
!Token::Match(ftok->next(), "this . %var%") &&
!Token::Match(ftok->next(), "* %var% =") &&
!Token::Match(ftok->next(), "( * this ) . %var%"))
continue;
// Goto the first token in this statement..
ftok = ftok->next();
// Skip "( * this )"
if (Token::simpleMatch(ftok, "( * this ) ."))
{
ftok = ftok->tokAt(5);
}
// Skip "this->"
if (Token::simpleMatch(ftok, "this ."))
ftok = ftok->tokAt(2);
// Skip "classname :: "
if (Token::Match(ftok, "%var% ::"))
ftok = ftok->tokAt(2);
// Clearing all variables..
if (Token::simpleMatch(ftok, "memset ( this ,"))
{
for (Var *var = varlist; var; var = var->next)
var->init = true;
return;
}
// Clearing array..
else if (Token::Match(ftok, "memset ( %var% ,"))
{
initVar(varlist, ftok->strAt(2));
ftok = ftok->next()->link();
continue;
}
// Calling member function?
else if (Token::Match(ftok, "%var% (") && ftok->str() != "if")
{
// Passing "this" => assume that everything is initialized
for (const Token * tok2 = ftok->next()->link(); tok2 && tok2 != ftok; tok2 = tok2->previous())
{
if (tok2->str() == "this")
{
for (Var *var = varlist; var; var = var->next)
var->init = true;
return;
}
}
// recursive call / calling overloaded function
// assume that all variables are initialized
if (std::find(callstack.begin(), callstack.end(), ftok->str()) != callstack.end())
{
for (Var *var = varlist; var; var = var->next)
var->init = true;
return;
}
int i = 0;
const Token *ftok2 = _tokenizer->findClassFunction(tok1, classname, ftok->strAt(0), i, isStruct);
if (ftok2)
{
callstack.push_back(ftok->str());
initializeVarList(tok1, ftok2, varlist, classname, callstack, isStruct);
callstack.pop_back();
}
else // there is a called member function, but it is not defined where we can find it, so we assume it initializes everything
{
// check if the function is part of this class..
const Token *tok = Token::findmatch(_tokenizer->tokens(), ((isStruct ? std::string("struct ") : std::string("class ")) + classname + " {|:").c_str());
bool derived = false;
while (tok && tok->str() != "{")
{
if (tok->str() == ":")
derived = true;
tok = tok->next();
}
for (tok = tok ? tok->next() : 0; tok; tok = tok->next())
{
if (tok->str() == "{")
{
tok = tok->link();
if (!tok)
break;
}
else if (tok->str() == "}")
{
break;
}
else if (tok->str() == ftok->str() || tok->str() == "friend")
{
if (tok->next()->str() == "(" || tok->str() == "friend")
{
tok = 0;
break;
}
}
}
// bail out..
if (!tok || derived)
{
for (Var *var = varlist; var; var = var->next)
var->init = true;
break;
}
// the function is external and it's neither friend nor inherited virtual function.
// assume all variables that are passed to it are initialized..
unsigned int indentlevel2 = 0;
for (tok = ftok->tokAt(2); tok; tok = tok->next())
{
if (tok->str() == "(")
++indentlevel2;
else if (tok->str() == ")")
{
if (indentlevel2 == 0)
break;
--indentlevel2;
}
if (tok->isName())
{
initVar(varlist, tok->strAt(0));
}
}
continue;
}
}
// Assignment of member variable?
else if (Token::Match(ftok, "%var% ="))
{
initVar(varlist, ftok->strAt(0));
}
// Assignment of array item of member variable?
else if (Token::Match(ftok, "%var% [ %any% ] ="))
{
initVar(varlist, ftok->strAt(0));
}
// Assignment of array item of member variable?
else if (Token::Match(ftok, "%var% [ %any% ] [ %any% ] ="))
{
initVar(varlist, ftok->strAt(0));
}
// Assignment of array item of member variable?
else if (Token::Match(ftok, "* %var% ="))
{
initVar(varlist, ftok->strAt(1));
}
// Assignment of struct member of member variable?
else if (Token::Match(ftok, "%var% . %any% ="))
{
initVar(varlist, ftok->strAt(0));
}
// The functions 'clear' and 'Clear' are supposed to initialize variable.
if (Token::Match(ftok, "%var% . clear|Clear ("))
{
initVar(varlist, ftok->strAt(0));
}
}
}
//---------------------------------------------------------------------------
// ClassCheck: Check that all class constructors are ok.
//---------------------------------------------------------------------------
struct Constructor
{
enum AccessControl { Public, Protected, Private };
Constructor(const Token * tok, AccessControl acc, bool body, bool equal, bool copy) :
token(tok), access(acc), hasBody(body), isOperatorEqual(equal), isCopyConstructor(copy)
{
}
const Token *token;
AccessControl access;
bool hasBody;
bool isOperatorEqual;
bool isCopyConstructor;
};
static bool argsMatch(const Token *first, const Token *second)
{
bool match = false;
while (first->str() == second->str())
{
// at end of argument list
if (first->str() == ")")
{
match = true;
break;
}
// skip default value assignment
else if (first->next()->str() == "=")
{
first = first->tokAt(2);
continue;
}
// definition missing variable name
else if (first->next()->str() == "," && second->next()->str() != ",")
second = second->next();
else if (first->next()->str() == ")" && second->next()->str() != ")")
second = second->next();
// argument list has different number of arguments
else if (second->str() == ")")
break;
// variable names are different
else if ((Token::Match(first->next(), "%var% ,|)|=") &&
Token::Match(second->next(), "%var% ,|)")) &&
(first->next()->str() != second->next()->str()))
{
// skip variable names
first = first->next();
second = second->next();
// skip default value assignment
if (first->next()->str() == "=")
first = first->tokAt(2);
}
first = first->next();
second = second->next();
}
return match;
}
struct SpaceInfo
{
bool isNamespace;
std::string className;
const Token * classEnd;
};
void CheckClass::constructors()
{
if (!_settings->_checkCodingStyle)
return;
const char pattern_class[] = "class|struct|namespace %var% [{:]";
std::vector<SpaceInfo> spaceInfo;
bool isNamespace = false;
std::string className;
for (const Token *tok1 = _tokenizer->tokens(); tok1; tok1 = tok1->next())
{
if (!spaceInfo.empty())
{
if (tok1 == spaceInfo.back().classEnd)
{
spaceInfo.pop_back();
continue;
}
}
// Locate class
if (Token::Match(tok1, pattern_class))
{
isNamespace = (tok1->str() == "namespace");
className = tok1->next()->str();
bool isStruct = tok1->str() == "struct";
const Token *tok2 = tok1->tokAt(2);
while (tok2->str() != "{")
tok2 = tok2->next();
SpaceInfo info;
info.isNamespace = isNamespace;
info.className = className;
info.classEnd = tok2->link();
spaceInfo.push_back(info);
if (isNamespace)
continue;
int indentlevel = 0;
Constructor::AccessControl access = isStruct ? Constructor::Public : Constructor::Private;
std::list<Constructor> constructorList;
unsigned int numConstructors = 0;
// check to end of class definition
for (const Token *tok = tok1; tok; tok = tok->next())
{
// Indentation
if (tok->str() == "{")
++indentlevel;
else if (tok->str() == "}")
{
--indentlevel;
if (indentlevel <= 0)
break;
}
// Parse class contents (indentlevel == 1)..
if (indentlevel == 1)
{
// What section are we in..
if (tok->str() == "private:")
access = Constructor::Private;
else if (tok->str() == "protected:")
access = Constructor::Protected;
else if (tok->str() == "public:")
access = Constructor::Public;
// Is there a constructor?
else if (Token::simpleMatch(tok, (className + " (").c_str()) ||
Token::simpleMatch(tok, "operator = ("))
{
bool operatorEqual = tok->str() == "operator";
bool copyConstructor = Token::Match(tok, "%var% ( const %var% & %var%| )");
const Token *next = operatorEqual ? tok->tokAt(2)->link() : tok->next()->link();
if (!operatorEqual)
numConstructors++;
// out of line function
if (Token::Match(next, ") ;"))
{
// find using names on stack
int stack_index = spaceInfo.size() - 1;
std::string classPattern;
int offset1, offset2;
if (operatorEqual)
{
classPattern = "operator = (";
offset1 = offset2 = 3;
}
else
{
classPattern = className + " (";
offset1 = offset2 = 2;
}
bool hasBody = false;
while (!hasBody && stack_index >= 0)
{
classPattern = spaceInfo[stack_index].className + std::string(" :: ") + classPattern;
offset2 += 2;
// start looking at end of class
const Token *constructor_token = spaceInfo[stack_index].classEnd;
while ((constructor_token = Token::findmatch(constructor_token, classPattern.c_str())) != NULL)
{
// skip destructor and other classes
if (!Token::Match(constructor_token->previous(), "~|::"))
{
if (argsMatch(tok->tokAt(offset1), constructor_token->tokAt(offset2)))
{
constructorList.push_back(Constructor(constructor_token, access, true, operatorEqual, copyConstructor));
hasBody = true;
break;
}
}
// skip function body
while (constructor_token->str() != "{")
constructor_token = constructor_token->next();
constructor_token = constructor_token->link();
}
stack_index--;
}
// function body found?
if (!hasBody)
{
constructorList.push_back(Constructor(tok, access, false, operatorEqual, copyConstructor));
}
tok = next->next();
}
// inline function
else
{
// skip destructor and other classes
if (!Token::Match(tok->previous(), "~|::"))
{
constructorList.push_back(Constructor(tok, access, true, operatorEqual, copyConstructor));
}
// skip over function body
tok = next->next();
while (tok->str() != "{")
tok = tok->next();
tok = tok->link();
}
}
}
}
// Get variables...
Var *varlist = getVarList(tok1);
// There are no constructors.
if (numConstructors == 0)
{
// If there is a private variable, there should be a constructor..
for (const Var *var = varlist; var; var = var->next)
{
if (var->priv && !var->isClass && !var->isStatic)
{
noConstructorError(tok1, className, isStruct);
break;
}
}
}
std::list<Constructor>::const_iterator it;
for (it = constructorList.begin(); it != constructorList.end(); ++it)
{
if (!it->hasBody)
continue;
std::list<std::string> callstack;
initializeVarList(tok1, it->token, varlist, className, callstack, isStruct);
// Check if any variables are uninitialized
for (Var *var = varlist; var; var = var->next)
{
// skip classes for regular constructor
if (var->isClass && !(it->isCopyConstructor || it->isOperatorEqual))
continue;
if (var->init || var->isStatic)
continue;
// It's non-static and it's not initialized => error
if (it->isOperatorEqual)
{
const Token *operStart = 0;
if (Token::simpleMatch(it->token, "operator = ("))
operStart = it->token->tokAt(2);
else
operStart = it->token->tokAt(4);
bool classNameUsed = false;
for (const Token *operTok = operStart; operTok != operStart->link(); operTok = operTok->next())
{
if (operTok->str() == className)
{
classNameUsed = true;
break;
}
}
if (classNameUsed)
operatorEqVarError(it->token, className, var->name);
}
else if (it->access != Constructor::Private && !var->isStatic)
uninitVarError(it->token, className, var->name);
}
// Mark all variables not used
for (Var *var = varlist; var; var = var->next)
var->init = false;
}
// Delete the varlist..
while (varlist)
{
Var *nextvar = varlist->next;
delete varlist;
varlist = nextvar;
}
}
}
}
//---------------------------------------------------------------------------
// ClassCheck: Unused private functions
//---------------------------------------------------------------------------
void CheckClass::privateFunctions()
{
if (!_settings->_checkCodingStyle)
return;
const char pattern_class[] = "class|struct %var% {|:";
// Locate some class
for (const Token *tok1 = Token::findmatch(_tokenizer->tokens(), pattern_class);
tok1; tok1 = Token::findmatch(tok1->next(), pattern_class))
{
/** @todo check that the whole class implementation is seen */
// until the todo above is fixed we only check classes that are
// declared in the source file
if (tok1->fileIndex() != 0)
continue;
const std::string &classname = tok1->next()->str();
// Get private functions..
std::list<const Token *> FuncList;
FuncList.clear();
bool isStruct = tok1->str() == "struct";
bool priv = !isStruct;
unsigned int indent_level = 0;
for (const Token *tok = tok1; tok; tok = tok->next())
{
if (Token::Match(tok, "friend %var%"))
{
/** @todo Handle friend classes */
FuncList.clear();
break;
}
if (tok->str() == "{")
++indent_level;
else if (tok->str() == "}")
{
if (indent_level <= 1)
break;
--indent_level;
}
else if (indent_level != 1)
continue;
else if (tok->str() == "private:")
priv = true;
else if (tok->str() == "public:")
priv = false;
else if (tok->str() == "protected:")
priv = false;
else if (priv)
{
if (Token::Match(tok, "typedef %type% ("))
tok = tok->tokAt(2)->link();
else if (Token::Match(tok, "[:,] %var% ("))
tok = tok->tokAt(2)->link();
else if (Token::Match(tok, "%var% (") &&
!Token::simpleMatch(tok->next()->link(), ") (") &&
!Token::Match(tok, classname.c_str()))
{
FuncList.push_back(tok);
}
}
/** @todo embedded class have access to private functions */
if (tok->str() == "class")
{
FuncList.clear();
break;
}
}
// Check that all private functions are used..
bool HasFuncImpl = false;
bool inclass = false;
indent_level = 0;
for (const Token *ftok = _tokenizer->tokens(); ftok; ftok = ftok->next())
{
if (ftok->str() == "{")
++indent_level;
else if (ftok->str() == "}")
{
if (indent_level > 0)
--indent_level;
if (indent_level == 0)
inclass = false;
}
if (Token::Match(ftok, ("class " + classname + " :|{").c_str()))
{
indent_level = 0;
inclass = true;
}
// Check member class functions to see what functions are used..
if ((inclass && indent_level == 1 && Token::Match(ftok, "%var% (")) ||
(Token::Match(ftok, (classname + " :: ~| %var% (").c_str())))
{
while (ftok && ftok->str() != ")")
ftok = ftok->next();
if (!ftok)
break;
if (Token::Match(ftok, ") : %var% ("))
{
while (!Token::Match(ftok->next(), "[{};]"))
{
if (Token::Match(ftok, "::|,|( %var% ,|)"))
{
// Remove function from FuncList
std::list<const Token *>::iterator it = FuncList.begin();
while (it != FuncList.end())
{
if (ftok->next()->str() == (*it)->str())
FuncList.erase(it++);
else
it++;
}
}
ftok = ftok->next();
}
}
if (!Token::Match(ftok, ") const| {"))
continue;
if (ftok->fileIndex() == 0)
HasFuncImpl = true;
// Parse function..
int indentlevel2 = 0;
for (const Token *tok2 = ftok; tok2; tok2 = tok2->next())
{
if (tok2->str() == "{")
++indentlevel2;
else if (tok2->str() == "}")
{
--indentlevel2;
if (indentlevel2 < 1)
break;
}
else if (Token::Match(tok2, "%var% ("))
{
// Remove function from FuncList
std::list<const Token *>::iterator it = FuncList.begin();
while (it != FuncList.end())
{
if (tok2->str() == (*it)->str())
FuncList.erase(it++);
else
it++;
}
}
}
}
}
while (HasFuncImpl && !FuncList.empty())
{
// Final check; check if the function pointer is used somewhere..
const std::string _pattern("return|(|)|,|= " + FuncList.front()->str());
if (!Token::findmatch(_tokenizer->tokens(), _pattern.c_str()))
{
unusedPrivateFunctionError(FuncList.front(), classname, FuncList.front()->str());
}
FuncList.pop_front();
}
}
}
//---------------------------------------------------------------------------
// ClassCheck: Check that memset is not used on classes
//---------------------------------------------------------------------------
void CheckClass::noMemset()
{
// Locate all 'memset' tokens..
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
{
if (!Token::Match(tok, "memset|memcpy|memmove"))
continue;
std::string type;
if (Token::Match(tok, "memset ( %var% , %num% , sizeof ( %type% ) )"))
type = tok->strAt(8);
else if (Token::Match(tok, "memset ( & %var% , %num% , sizeof ( %type% ) )"))
type = tok->strAt(9);
else if (Token::Match(tok, "memset ( %var% , %num% , sizeof ( struct %type% ) )"))
type = tok->strAt(9);
else if (Token::Match(tok, "memset ( & %var% , %num% , sizeof ( struct %type% ) )"))
type = tok->strAt(10);
else if (Token::Match(tok, "%type% ( %var% , %var% , sizeof ( %type% ) )"))
type = tok->strAt(8);
// No type defined => The tokens didn't match
if (type.empty())
continue;
// Warn if type is a class or struct that contains any std::* variables
const std::string pattern2(std::string("struct|class ") + type + " {");
for (const Token *tstruct = Token::findmatch(_tokenizer->tokens(), pattern2.c_str()); tstruct; tstruct = tstruct->next())
{
if (tstruct->str() == "}")
break;
// struct with function? skip function body..
if (Token::simpleMatch(tstruct, ") {"))
{
tstruct = tstruct->next()->link();
if (!tstruct)
break;
}
// before a statement there must be either:
// * private:|protected:|public:
// * { } ;
if (Token::Match(tstruct, "[;{}]") ||
tstruct->str().find(":") != std::string::npos)
{
if (Token::Match(tstruct->next(), "std :: %type% %var% ;"))
memsetStructError(tok, tok->str(), tstruct->strAt(3));
else if (Token::Match(tstruct->next(), "std :: %type% < "))
{
// backup the type
const std::string typestr(tstruct->strAt(3));
// check if it's a pointer variable..
unsigned int level = 0;
while (0 != (tstruct = tstruct->next()))
{
if (tstruct->str() == "<")
++level;
else if (tstruct->str() == ">")
{
if (level <= 1)
break;
--level;
}
else if (tstruct->str() == "(")
tstruct = tstruct->link();
}
if (!tstruct)
break;
// found error => report
if (Token::Match(tstruct, "> %var% ;"))
memsetStructError(tok, tok->str(), typestr);
}
}
}
}
}
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// ClassCheck: "void operator=("
//---------------------------------------------------------------------------
void CheckClass::operatorEq()
{
if (!_settings->_checkCodingStyle)
return;
const Token *tok2 = _tokenizer->tokens();
const Token *tok;
while ((tok = Token::findmatch(tok2, "void operator = (")) != NULL)
{
const Token *tok1 = tok;
while (tok1 && !Token::Match(tok1, "class|struct %var%"))
{
if (tok1->str() == "public:")
{
operatorEqReturnError(tok);
break;
}
if (tok1->str() == "private:" || tok1->str() == "protected:")
break;
tok1 = tok1->previous();
}
if (tok1 && Token::Match(tok1, "struct %var%"))
operatorEqReturnError(tok);
tok2 = tok->next();
}
}
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// ClassCheck: "C& operator=(const C&) { ... return *this; }"
// operator= should return a reference to *this
//---------------------------------------------------------------------------
// match two lists of tokens
static bool nameMatch(const Token * tok1, const Token * tok2, int length)
{
for (int i = 0; i < length; i++)
{
if (tok1->tokAt(i) == 0 || tok2->tokAt(i) == 0)
return false;
if (tok1->tokAt(i)->str() != tok2->tokAt(i)->str())
return false;
}
return true;
}
// create a class name from a list of tokens
static void nameStr(const Token * name, int length, std::string & str)
{
for (int i = 0; i < length; i++)
{
if (i != 0)
str += " ";
str += name->tokAt(i)->str();
}
}
void CheckClass::operatorEqRetRefThis_finderr(const Token *tok, const std::string &classname)
{
// find the ')'
const Token *tok1 = tok->tokAt(2)->link();
// is there an implementation?
if (Token::simpleMatch(tok1, ") {"))
{
bool foundReturn = false;
const Token *last = tok1->next()->link();
for (tok1 = tok1->tokAt(2); tok1 && tok1 != last; tok1 = tok1->next())
{
// check for return of reference to this
if (tok1->str() == "return")
{
foundReturn = true;
std::string cast("( " + classname + " & )");
if (Token::Match(tok1->next(), cast.c_str()))
tok1 = tok1->tokAt(4);
if (!(Token::Match(tok1->tokAt(1), "(| * this ;|=") ||
Token::Match(tok1->tokAt(1), "(| * this +=") ||
Token::Match(tok1->tokAt(1), "operator = (")))
operatorEqRetRefThisError(tok);
}
}
if (!foundReturn)
operatorEqRetRefThisError(tok);
}
}
void CheckClass::operatorEqRetRefThis()
{
if (!_settings->_checkCodingStyle)
return;
const Token *tok2 = _tokenizer->tokens();
const Token *tok;
while ((tok = Token::findmatch(tok2, "operator = (")) != NULL)
{
const Token *tok1 = tok;
if (tok1->tokAt(-2) && Token::Match(tok1->tokAt(-2), " %type% ::"))
{
// make sure this is an assignment operator
int nameLength = 1;
tok1 = tok1->tokAt(-2);
// check backwards for proper function signature
while (tok1->tokAt(-2) && Token::Match(tok1->tokAt(-2), " %type% ::"))
{
tok1 = tok1->tokAt(-2);
nameLength += 2;
}
const Token *className = tok1;
std::string nameString;
nameStr(className, nameLength, nameString);
if (tok1->tokAt(-1) && tok1->tokAt(-1)->str() == "&")
{
// check class name
if (tok1->tokAt(-(1 + nameLength)) && nameMatch(className, tok1->tokAt(-(1 + nameLength)), nameLength))
{
operatorEqRetRefThis_finderr(tok, className->str());
}
}
}
else
{
// make sure this is an assignment operator
tok1 = tok;
// check backwards for proper function signature
if (tok1->tokAt(-1) && tok1->tokAt(-1)->str() == "&")
{
const Token *className = 0;
bool isPublic = false;
while (tok1 && !Token::Match(tok1, "class|struct %var%"))
{
if (!isPublic)
{
if (tok1->str() == "public:")
isPublic = true;
}
tok1 = tok1->previous();
}
if (Token::Match(tok1, "struct|class %var%"))
{
// data members in structs are public by default
isPublic = bool(tok1->str() == "struct");
className = tok1->tokAt(1);
}
if (tok->tokAt(-2) && tok->tokAt(-2)->str() == className->str())
{
operatorEqRetRefThis_finderr(tok, className->str());
}
}
}
tok2 = tok->next();
}
}
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// ClassCheck: "C& operator=(const C& rhs) { if (this == &rhs) ... }"
// operator= should check for assignment to self
//
// For simple classes, an assignment to self check is only a potential optimization.
//
// For classes that allocate dynamic memory, assignment to self can be a real error
// if it is deallocated and allocated again without being checked for.
//
// This check is not valid for classes with multiple inheritance because a
// class can have multiple addresses so there is no trivial way to check for
// assignment to self.
//---------------------------------------------------------------------------
static bool hasDeallocation(const Token * first, const Token * last)
{
// This function is called when no simple check was found for assignment
// to self. We are currently looking for a specific sequence of:
// deallocate member ; ... member = allocate
// This check is far from ideal because it can cause false negatives.
// Unfortunately, this is necessary to prevent false positives.
// This check needs to do careful analysis someday to get this
// correct with a high degree of certainty.
for (const Token * tok = first; tok && (tok != last); tok = tok->next())
{
// check for deallocating memory
if (Token::Match(tok, "{|;|, free ( %var%"))
{
const Token * var = tok->tokAt(3);
// we should probably check that var is a pointer in this class
const Token * tok1 = tok->tokAt(4);
while (tok1 && (tok1 != last))
{
if (Token::Match(tok1, "%var% ="))
{
if (tok1->str() == var->str())
return true;
}
tok1 = tok1->next();
}
}
else if (Token::Match(tok, "{|;|, delete [ ] %var%"))
{
const Token * var = tok->tokAt(4);
// we should probably check that var is a pointer in this class
const Token * tok1 = tok->tokAt(5);
while (tok1 && (tok1 != last))
{
if (Token::Match(tok1, "%var% = new %type% ["))
{
if (tok1->str() == var->str())
return true;
}
tok1 = tok1->next();
}
}
else if (Token::Match(tok, "{|;|, delete %var%"))
{
const Token * var = tok->tokAt(2);
// we should probably check that var is a pointer in this class
const Token * tok1 = tok->tokAt(3);
while (tok1 && (tok1 != last))
{
if (Token::Match(tok1, "%var% = new"))
{
if (tok1->str() == var->str())
return true;
}
tok1 = tok1->next();
}
}
}
return false;
}
static bool hasAssignSelf(const Token * first, const Token * last, const Token * rhs)
{
for (const Token * tok = first; tok && tok != last; tok = tok->next())
{
if (Token::Match(tok, "if ("))
{
const Token * tok1 = tok->tokAt(2);
const Token * tok2 = tok->tokAt(1)->link();
if (tok1 && tok2)
{
for (; tok1 && tok1 != tok2; tok1 = tok1->next())
{
if (Token::Match(tok1, "this ==|!= & %var%"))
{
if (tok1->tokAt(3)->str() == rhs->str())
return true;
}
else if (Token::Match(tok1, "& %var% ==|!= this"))
{
if (tok1->tokAt(1)->str() == rhs->str())
return true;
}
}
}
}
}
return false;
}
static bool hasMultipleInheritanceInline(const Token * tok)
{
while (tok && tok->str() != "{")
{
if (tok->str() == ",")
return true;
tok = tok->next();
}
return false;
}
static bool hasMultipleInheritanceGlobal(const Token * start, const std::string & name)
{
const Token *tok = start;
std::string pattern;
std::string className = name;
// check for nested classes
while (className.find("::") != std::string::npos)
{
std::string tempName;
// there is probably a better way to do this
while (className[0] != ' ')
{
tempName += className[0];
className.erase(0, 1);
}
className.erase(0, 4);
pattern = "class|struct " + tempName;
tok = Token::findmatch(tok, pattern.c_str());
}
pattern = "class|struct " + className;
tok = Token::findmatch(tok, pattern.c_str());
return hasMultipleInheritanceInline(tok);
}
void CheckClass::operatorEqToSelf()
{
if (!_settings->_checkCodingStyle)
return;
const Token *tok2 = _tokenizer->tokens();
const Token *tok;
while ((tok = Token::findmatch(tok2, "operator = (")) != NULL)
{
const Token *tok1 = tok;
// make sure this is an assignment operator
if (tok1->tokAt(-2) && Token::Match(tok1->tokAt(-2), " %type% ::"))
{
int nameLength = 1;
tok1 = tok1->tokAt(-2);
// check backwards for proper function signature
while (tok1->tokAt(-2) && Token::Match(tok1->tokAt(-2), " %type% ::"))
{
tok1 = tok1->tokAt(-2);
nameLength += 2;
}
const Token *className = tok1;
std::string nameString;
nameStr(className, nameLength, nameString);
if (!hasMultipleInheritanceGlobal(_tokenizer->tokens(), nameString))
{
if (tok1->tokAt(-1) && tok1->tokAt(-1)->str() == "&")
{
// check returned class name
if (tok1->tokAt(-(1 + nameLength)) && nameMatch(className, tok1->tokAt(-(1 + nameLength)), nameLength))
{
// check forward for proper function signature
std::string pattern = "const " + nameString + " & %var% )";
if (Token::Match(tok->tokAt(3), pattern.c_str()))
{
const Token * rhs = tok->tokAt(5 + nameLength);
if (nameMatch(className, tok->tokAt(4), nameLength))
{
tok1 = tok->tokAt(2)->link();
if (tok1 && tok1->tokAt(1) && tok1->tokAt(1)->str() == "{" && tok1->tokAt(1)->link())
{
const Token *first = tok1->tokAt(1);
const Token *last = first->link();
if (!hasAssignSelf(first, last, rhs))
{
if (hasDeallocation(first, last))
operatorEqToSelfError(tok);
}
}
}
}
}
}
}
}
else
{
tok1 = tok;
// check backwards for proper function signature
if (tok1->tokAt(-1) && tok1->tokAt(-1)->str() == "&")
{
const Token *className = 0;
while (tok1 && !Token::Match(tok1, "class|struct %var%"))
tok1 = tok1->previous();
if (Token::Match(tok1, "struct|class %var%"))
className = tok1->tokAt(1);
if (!hasMultipleInheritanceInline(tok1))
{
if (Token::simpleMatch(tok->tokAt(-2), className->str().c_str()))
{
// check forward for proper function signature
if (Token::Match(tok->tokAt(3), "const %type% & %var% )"))
{
const Token * rhs = tok->tokAt(6);
if (tok->tokAt(4)->str() == className->str())
{
tok1 = tok->tokAt(2)->link();
if (tok1 && Token::simpleMatch(tok1->next(), "{"))
{
const Token *first = tok1->next();
const Token *last = first->link();
if (!hasAssignSelf(first, last, rhs))
{
if (hasDeallocation(first, last))
operatorEqToSelfError(tok);
}
}
}
}
}
}
}
}
tok2 = tok->next();
}
}
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// A destructor in a base class should be virtual
//---------------------------------------------------------------------------
void CheckClass::virtualDestructor()
{
// This error should only be given if:
// * base class doesn't have virtual destructor
// * derived class has non-empty destructor
// * base class is deleted
if (!_settings->inconclusive)
return;
const char pattern_classdecl[] = "class %var% : %var%";
const Token *derived = _tokenizer->tokens();
while ((derived = Token::findmatch(derived, pattern_classdecl)) != NULL)
{
// Check that the derived class has a non empty destructor..
{
std::ostringstream destructorPattern;
destructorPattern << "~ " << derived->strAt(1) << " ( ) {";
const Token *derived_destructor = Token::findmatch(_tokenizer->tokens(), destructorPattern.str().c_str());
// No destructor..
if (! derived_destructor)
{
derived = derived->next();
continue;
}
// Empty destructor..
if (Token::Match(derived_destructor, "~ %var% ( ) { }"))
{
derived = derived->next();
continue;
}
}
const Token *derivedClass = derived->tokAt(1);
// Iterate through each base class...
derived = derived->tokAt(3);
while (Token::Match(derived, "%var%"))
{
bool isPublic(derived->str() == "public");
// What kind of inheritance is it.. public|protected|private
if (Token::Match(derived, "public|protected|private"))
derived = derived->next();
// Name of base class..
const std::string baseName = derived->strAt(0);
// Update derived so it's ready for the next loop.
do
{
if (derived->str() == "{")
break;
if (derived->str() == ",")
{
derived = derived->next();
break;
}
derived = derived->next();
}
while (derived);
// If not public inheritance, skip checking of this base class..
if (! isPublic)
continue;
// Find the destructor declaration for the base class.
const Token *base = Token::findmatch(_tokenizer->tokens(), (std::string("%any% ~ ") + baseName + " (").c_str());
while (base && base->str() == "::")
base = Token::findmatch(base->next(), (std::string("%any% ~ ") + baseName + " (").c_str());
const Token *reverseTok = base;
while (Token::Match(base, "%var%") && base->str() != "virtual")
base = base->previous();
// Check that there is a destructor..
if (! base)
{
// Is the class declaration available?
base = Token::findmatch(_tokenizer->tokens(), (std::string("class ") + baseName + " {").c_str());
if (base)
{
virtualDestructorError(base, baseName, derivedClass->str());
}
continue;
}
// There is a destructor. Check that it's virtual..
else if (base->str() == "virtual")
continue;
// TODO: This is just a temporary fix, better solution is needed.
// Skip situations where base class has base classes of its own, because
// some of the base classes might have virtual destructor.
// Proper solution is to check all of the base classes. If base class is not
// found or if one of the base classes has virtual destructor, error should not
// be printed. See TODO test case "virtualDestructorInherited"
if (!Token::findmatch(_tokenizer->tokens(), (std::string("class ") + baseName + " {").c_str()))
continue;
// Make sure that the destructor is public (protected or private
// would not compile if inheritance is used in a way that would
// cause the bug we are trying to find here.)
int indent = 0;
while (reverseTok)
{
if (reverseTok->str() == "public:")
{
virtualDestructorError(base, baseName, derivedClass->str());
break;
}
else if (reverseTok->str() == "protected:" ||
reverseTok->str() == "private:")
{
// No bug, protected/private destructor is allowed
break;
}
else if (reverseTok->str() == "{")
{
indent++;
if (indent >= 1)
{
// We have found the start of the class without any sign
// of "public :" so we can assume that the destructor is not
// public and there is no bug in the code we are checking.
break;
}
}
else if (reverseTok->str() == "}")
indent--;
reverseTok = reverseTok->previous();
}
}
}
}
//---------------------------------------------------------------------------
void CheckClass::thisSubtractionError(const Token *tok)
{
reportError(tok, Severity::style, "thisSubtraction", "Suspicious pointer subtraction");
}
void CheckClass::thisSubtraction()
{
if (!_settings->_checkCodingStyle)
return;
const Token *tok = _tokenizer->tokens();
for (;;)
{
tok = Token::findmatch(tok, "this - %var%");
if (!tok)
break;
if (!Token::simpleMatch(tok->previous(), "*"))
thisSubtractionError(tok);
tok = tok->next();
}
}
//---------------------------------------------------------------------------
// check if this function is defined virtual in the base classes
bool CheckClass::isVirtual(const std::vector<std::string> &derivedFrom, const Token *functionToken) const
{
// check each base class
for (unsigned int i = 0; i < derivedFrom.size(); ++i)
{
std::string className;
if (derivedFrom[i].find("::") != std::string::npos)
{
/** @todo handle nested base classes and namespaces */
}
else
className = derivedFrom[i];
std::string classPattern = std::string("class|struct ") + className + std::string(" {|:");
// find the base class
const Token *classToken = Token::findmatch(_tokenizer->tokens(), classPattern.c_str());
// find the function in the base class
if (classToken)
{
std::vector<std::string> baseList;
const Token * tok = classToken;
while (tok->str() != "{")
{
// check for base classes
if (Token::Match(tok, ":|, public|protected|private"))
{
// jump to base class name
tok = tok->tokAt(2);
std::string base;
// handle nested base classea and namespacess
while (Token::Match(tok, "%var% ::"))
{
base += tok->str();
base += " :: ";
tok = tok->tokAt(2);
}
base += tok->str();
// save pattern for base class name
baseList.push_back(base);
}
tok = tok->next();
}
tok = tok->next();
for (; tok; tok = tok->next())
{
if (tok->str() == "{")
tok = tok->link();
else if (tok->str() == "}")
break;
else if (Token::Match(tok, "public:|protected:|private:"))
continue;
else if (tok->str() == "(")
tok = tok->link();
else if (tok->str() == "virtual")
{
// goto the function name
while (tok->next()->str() != "(")
tok = tok->next();
// do the function names match?
if (tok->str() == functionToken->str())
{
const Token *temp1 = tok->previous();
const Token *temp2 = functionToken->previous();
bool returnMatch = true;
// check for matching return parameters
while (temp1->str() != "virtual")
{
if (temp1->str() != temp2->str())
{
returnMatch = false;
break;
}
temp1 = temp1->previous();
temp2 = temp2->previous();
}
// check for matching function parameters
if (returnMatch && argsMatch(tok->tokAt(2), functionToken->tokAt(2)))
{
return true;
}
}
}
}
if (!baseList.empty())
{
if (isVirtual(baseList, functionToken))
return true;
}
}
}
return false;
}
struct NestInfo
{
std::string className;
const Token *classStart;
const Token *classEnd;
int levelEnd;
std::vector<std::string> derivedFrom;
};
// Can a function be const?
void CheckClass::checkConst()
{
if (!_settings->_checkCodingStyle)
return;
std::vector<NestInfo> nestInfo;
int level = 0;
Var *varlist = 0;
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
{
if (tok->str() == "{" && !nestInfo.empty())
level++;
else if (tok->str() == "}" && !nestInfo.empty())
{
level--;
if (level == nestInfo.back().levelEnd)
nestInfo.pop_back();
}
else if (Token::Match(tok, "class|struct %var% {|:"))
{
const Token *classTok = tok;
NestInfo info;
// get class name..
std::string classname(tok->strAt(1));
info.className = classname;
info.classStart = tok;
// goto initial '{'
while (tok && tok->str() != "{")
{
// check for base classes
if (Token::Match(tok, ":|, public|protected|private"))
{
// jump to base class name
tok = tok->tokAt(2);
std::string derivedFrom;
// handle derived base classes
while (Token::Match(tok, "%var% ::"))
{
derivedFrom += tok->str();
derivedFrom += " :: ";
tok = tok->tokAt(2);
}
derivedFrom += tok->str();
// save pattern for base class name
info.derivedFrom.push_back(derivedFrom);
}
tok = tok->next();
}
if (!tok)
break;
const Token *classEnd = tok->link();
info.classEnd = classEnd;
info.levelEnd = level++;
nestInfo.push_back(info);
// Delete the varlist..
while (varlist)
{
Var *nextvar = varlist->next;
delete varlist;
varlist = nextvar;
}
// Get class variables...
varlist = getVarList(classTok);
// parse in this class definition to see if there are any simple getter functions
for (const Token *tok2 = tok->next(); tok2; tok2 = tok2->next())
{
if (tok2->str() == "{")
tok2 = tok2->link();
else if (tok2->str() == "}")
break;
2010-01-24 13:45:56 +01:00
// start of statement?
if (!Token::Match(tok2->previous(), "[;{}]"))
2010-01-24 13:45:56 +01:00
continue;
// skip private: public: etc
if (tok2->isName() && tok2->str().find(":") != std::string::npos)
{
if (tok2->next()->str() == "}")
continue;
tok2 = tok2->next();
}
2010-01-24 13:45:56 +01:00
// static functions can't be const
// virtual functions may be non-const for a reason
if (Token::Match(tok2, "static|virtual"))
continue;
// don't warn for unknown types..
// LPVOID, HDC, etc
if (tok2->isName())
{
bool allupper = true;
const std::string s(tok2->str());
for (std::string::size_type pos = 0; pos < s.size(); ++pos)
{
unsigned char ch = s[pos];
if (!(ch == '_' || (ch >= 'A' && ch <= 'Z')))
{
allupper = false;
break;
}
}
if (allupper)
continue;
}
// member function?
if (isMemberFunc(tok2))
{
// goto function name..
while (tok2->next()->str() != "(")
tok2 = tok2->next();
// get function name
const std::string functionName((tok2->isName() ? "" : "operator") + tok2->str());
// skip constructor
if (functionName == classname)
continue;
const Token *functionToken = tok2;
// goto the ')'
tok2 = tok2->next()->link();
if (!tok2)
break;
// is this a non-const function that is implemented inline?
if (Token::simpleMatch(tok2, ") {"))
{
const Token *paramEnd = tok2;
// check if base class function is virtual
if (!info.derivedFrom.empty())
{
if (isVirtual(info.derivedFrom, functionToken))
continue;
}
// if nothing non-const was found. write error..
if (checkConstFunc(classname, varlist, paramEnd))
{
for (int i = nestInfo.size() - 2; i >= 0; i--)
classname = std::string(nestInfo[i].className + "::" + classname);
checkConstError(tok2, classname, functionName);
}
}
else if (Token::simpleMatch(tok2, ") ;")) // not inline
{
// check if base class function is virtual
if (!info.derivedFrom.empty())
{
if (isVirtual(info.derivedFrom, functionToken))
continue;
}
for (int i = nestInfo.size() - 1; i >= 0; i--)
{
const Token *found = nestInfo[i].classEnd;
std::string pattern(functionName + " (");
int namespaceLevel = 0;
for (int j = nestInfo.size() - 1; j >= i; j--, namespaceLevel++)
pattern = std::string(nestInfo[j].className + " :: " + pattern);
while ((found = Token::findmatch(found->next(), pattern.c_str())) != NULL)
{
const Token *paramEnd = found->tokAt(1 + (2 * namespaceLevel))->link();
if (!paramEnd)
break;
if (paramEnd->next()->str() != "{")
break;
if (sameFunc(namespaceLevel, tok2, paramEnd))
{
// if nothing non-const was found. write error..
if (checkConstFunc(classname, varlist, paramEnd))
{
for (int k = nestInfo.size() - 2; k >= 0; k--)
classname = std::string(nestInfo[k].className + "::" + classname);
checkConstError2(found, tok2, classname, functionName);
}
}
}
}
}
}
}
}
}
// Delete the varlist..
while (varlist)
{
Var *nextvar = varlist->next;
delete varlist;
varlist = nextvar;
}
}
bool CheckClass::sameFunc(int nest, const Token *firstEnd, const Token *secondEnd)
{
// check return type (search backwards until previous statement)
const Token * firstStart = firstEnd->link()->tokAt(-2);
const Token * secondStart = secondEnd->link()->tokAt((-2 * nest) - 2);
bool firstDone = false;
bool secondDone = false;
for ( ; ; )
{
firstDone = false;
secondDone = false;
if (!firstStart || Token::Match(firstStart, ";|}|{|public:|protected:|private:"))
firstDone = true;
if (!secondStart || Token::Match(secondStart, ";|}|{|public:|protected:|private:"))
secondDone = true;
if (firstDone != secondDone)
return false;
// both done and match
if (firstDone)
break;
if (secondStart->str() != firstStart->str())
return false;
firstStart = firstStart->previous();
secondStart = secondStart->previous();
}
// check parameter types (names can be different or missing)
firstStart = firstEnd->link()->next();
secondStart = secondEnd->link()->next();
for ( ; ; )
{
firstDone = false;
secondDone = false;
bool again = true;
while (again)
{
again = false;
if (firstStart == firstEnd)
firstDone = true;
if (secondStart == secondEnd)
secondDone = true;
// possible difference in number of parameters
if (firstDone != secondDone)
{
// check for missing names
if (firstDone)
{
if (secondStart->varId() != 0)
again = true;
}
else
{
if (firstStart->varId() != 0)
again = true;
}
if (!again)
return false;
}
// both done and match
if (firstDone && !again)
return true;
if (firstStart->varId() != 0)
{
// skip variable name
firstStart = firstStart->next();
again = true;
}
if (secondStart->varId() != 0)
{
// skip variable name
secondStart = secondStart->next();
again = true;
}
}
if (firstStart->str() != secondStart->str())
return false;
// retry after skipped variable names
if (!again)
{
firstStart = firstStart->next();
secondStart = secondStart->next();
}
}
return true;
}
// A const member function can return either a copy of or
// a const reference or pointer to something.
// Is this a member function with these signatures:
// type var ( returns a copy of something
// const type var ( returns a const copy of something
// const type & var ( returns a const reference to something
// const type * var ( returns a const pointer to something
// type operator any ( returns a copy of something
// const type operator any ( returns a const copy of something
// const type & operator any ( returns a const reference to something
// const type * operator any ( returns a const pointer to something
// Type can be anything from a standard type to a complex template.
bool CheckClass::isMemberFunc(const Token *tok)
{
bool isConst = false;
if (tok->str() == "const")
{
isConst = true;
tok = tok->next();
}
if (Token::Match(tok, "%type%"))
{
tok = tok->next();
if (Token::Match(tok, "%var% ("))
return true;
else if (Token::Match(tok, "operator %any% ("))
return true;
while (Token::Match(tok, ":: %type%"))
tok = tok->tokAt(2);
// template with parameter(s)?
if (Token::Match(tok, "< %type%"))
{
unsigned int level = 1;
tok = tok->tokAt(2);
while (tok)
{
if (tok->str() == "<")
level++;
else if (tok->str() == ">")
{
level--;
if (level == 0)
{
tok = tok->next();
break;
}
}
// check for templates returning pointers or references
else if (Token::Match(tok, "*|&"))
{
int back = -2;
if (tok->strAt(back) == "::")
back -= 2;
if (tok->strAt(back) != "const")
{
if (!isConst)
return false;
}
}
tok = tok->next();
}
}
// template with default type
else if (Token::Match(tok, "< >"))
tok = tok->tokAt(2);
// operator something
else if (Token::Match(tok, "operator %any% ("))
return true;
if (isConst)
{
while (Token::Match(tok, "*|&"))
{
tok = tok->next();
if (tok->str() == "const")
tok = tok->next();
}
}
if (Token::Match(tok, "%var% ("))
return true;
}
return false;
}
bool CheckClass::isMemberVar(const std::string &classname, const Var *varlist, const Token *tok)
{
while (tok->previous() && !Token::Match(tok->previous(), "}|{|;|public:|protected:|private:|return|:|?"))
{
if (Token::Match(tok->previous(), "* this"))
return true;
tok = tok->previous();
}
if (tok->str() == "this")
return true;
2010-05-25 06:55:49 +02:00
if (Token::Match(tok, "( * %var% ) ["))
tok = tok->tokAt(2);
// ignore class namespace
if (tok->str() == classname && tok->next()->str() == "::")
tok = tok->tokAt(2);
for (const Var *var = varlist; var; var = var->next)
{
if (var->name == tok->str())
{
return !var->isMutable;
}
}
return false;
}
bool CheckClass::checkConstFunc(const std::string &classname, const Var *varlist, const Token *tok)
{
// if the function doesn't have any assignment nor function call,
// it can be a const function..
unsigned int indentlevel = 0;
bool isconst = true;
for (const Token *tok1 = tok; tok1; tok1 = tok1->next())
{
if (tok1->str() == "{")
++indentlevel;
else if (tok1->str() == "}")
{
if (indentlevel <= 1)
break;
--indentlevel;
}
// assignment.. = += |= ..
else if (tok1->str() == "=" ||
(tok1->str().find("=") == 1 &&
tok1->str().find_first_of("<!>") == std::string::npos))
{
if (isMemberVar(classname, varlist, tok1->previous()))
{
isconst = false;
break;
}
}
// streaming: <<
else if (tok1->str() == "<<" && isMemberVar(classname, varlist, tok1->previous()))
{
isconst = false;
break;
}
// increment/decrement (member variable?)..
else if (Token::Match(tok1, "++|--"))
{
isconst = false;
break;
}
// function call..
else if ((tok1->str() != "return" && Token::Match(tok1, "%var% (") && tok1->str() != "c_str") ||
Token::Match(tok1, "%var% < %any% > ("))
{
isconst = false;
break;
}
// delete..
else if (tok1->str() == "delete")
{
isconst = false;
break;
}
}
return isconst;
}
void CheckClass::checkConstError(const Token *tok, const std::string &classname, const std::string &funcname)
{
reportError(tok, Severity::style, "functionConst", "The function '" + classname + "::" + funcname + "' can be const");
}
void CheckClass::checkConstError2(const Token *tok1, const Token *tok2, const std::string &classname, const std::string &funcname)
{
std::list<const Token *> toks;
toks.push_back(tok1);
toks.push_back(tok2);
reportError(toks, Severity::style, "functionConst", "The function '" + classname + "::" + funcname + "' can be const");
}
void CheckClass::noConstructorError(const Token *tok, const std::string &classname, bool isStruct)
{
reportError(tok, Severity::style, "noConstructor", "The " + std::string(isStruct ? "struct" : "class") + " '" + classname + "' has no constructor. Member variables not initialized.");
}
void CheckClass::uninitVarError(const Token *tok, const std::string &classname, const std::string &varname)
{
reportError(tok, Severity::style, "uninitVar", "Member variable not initialized in the constructor '" + classname + "::" + varname + "'");
}
void CheckClass::operatorEqVarError(const Token *tok, const std::string &classname, const std::string &varname)
{
reportError(tok, Severity::style, "operatorEqVarError", "Member variable '" + classname + "::" + varname + "' is not assigned a value in '" + classname + "::operator=" + "'");
}
void CheckClass::unusedPrivateFunctionError(const Token *tok, const std::string &classname, const std::string &funcname)
{
reportError(tok, Severity::style, "unusedPrivateFunction", "Unused private function '" + classname + "::" + funcname + "'");
}
void CheckClass::memsetClassError(const Token *tok, const std::string &memfunc)
{
reportError(tok, Severity::error, "memsetClass", "Using '" + memfunc + "' on class");
}
void CheckClass::memsetStructError(const Token *tok, const std::string &memfunc, const std::string &classname)
{
reportError(tok, Severity::error, "memsetStruct", "Using '" + memfunc + "' on struct that contains a 'std::" + classname + "'");
}
void CheckClass::operatorEqReturnError(const Token *tok)
{
reportError(tok, Severity::style, "operatorEq", "'operator=' should return something");
}
void CheckClass::virtualDestructorError(const Token *tok, const std::string &Base, const std::string &Derived)
{
reportError(tok, Severity::error, "virtualDestructor", "Class " + Base + " which is inherited by class " + Derived + " does not have a virtual destructor");
}
void CheckClass::operatorEqRetRefThisError(const Token *tok)
{
reportError(tok, Severity::style, "operatorEqRetRefThis", "'operator=' should return reference to self");
}
void CheckClass::operatorEqToSelfError(const Token *tok)
{
reportError(tok, Severity::style, "operatorEqToSelf", "'operator=' should check for assignment to self");
}