cppcheck/CheckClass.cpp

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/*
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* c++check - c/c++ syntax checking
* Copyright (C) 2007 Daniel Marjamäki
*
* 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 "CommonCheck.h"
#include <locale>
#include <string>
#include <sstream>
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#include <cstring>
#include <algorithm>
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#ifdef __BORLANDC__
#include <ctype.h>
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#include <mem.h>
#endif
//---------------------------------------------------------------------------
extern bool CheckCodingStyle;
//---------------------------------------------------------------------------
struct VAR *CheckClass::ClassChecking_GetVarList(const TOKEN *tok1)
{
// Get variable list..
struct VAR *varlist = NULL;
unsigned int indentlevel = 0;
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for (const TOKEN *tok = tok1; tok; tok = tok->next)
{
if (!tok->next)
break;
if (tok->str[0] == '{')
indentlevel++;
if (tok->str[0] == '}')
{
if (indentlevel <= 1)
break;
indentlevel--;
}
if (indentlevel==1 && (strchr(";{}", tok->str[0]) || (tok->str[0]!=':' && strchr(tok->str, ':'))))
{
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const TOKEN *next = tok->next;
const char *varname = 0;
// Is it a variable declaration?
if ( Match(next,"%type% %var% ;") )
{
const char *types[] = {"bool", "char", "int", "short", "long", "float", "double", 0};
for ( int type = 0; types[type]; type++ )
{
if ( strcmp(next->str, types[type]) == 0)
{
varname = next->next->str;
break;
}
}
}
// Pointer?
else if ( Match(next, "%type% * %var% ;") )
{
varname = Tokenizer::getstr(next, 2);
}
if (varname)
{
struct VAR *var = new VAR;
memset(var, 0, sizeof(struct VAR));
var->name = varname;
var->init = false;
var->next = varlist;
varlist = var;
}
}
}
return varlist;
}
//---------------------------------------------------------------------------
CheckClass::CheckClass( Tokenizer *tokenizer )
{
_tokenizer = tokenizer;
}
CheckClass::~CheckClass()
{
}
const TOKEN * CheckClass::FindClassFunction( const TOKEN *tok, const char classname[], const char funcname[], int &indentlevel )
{
const char *_classname[2] = {0,0};
const char *_funcname[2] = {0,0};
_classname[0] = classname;
_funcname[0] = funcname;
if ( indentlevel < 0 || tok == NULL )
return NULL;
for ( ;tok; tok = tok->next )
{
if ( indentlevel == 0 &&
( Match(tok, "class %var1% {", _classname) ||
Match(tok, "class %var1% : %type% {", _classname) ) )
{
if ( Match(tok, "class %var% {") )
tok = Tokenizer::gettok(tok, 3);
else
tok = Tokenizer::gettok(tok, 5);
indentlevel = 1;
}
if ( tok->str[0] == '{' )
{
// If indentlevel==0 don't go to indentlevel 1. Skip the block.
if ( indentlevel > 0 )
++indentlevel;
else
{
for ( ; tok; tok = tok->next )
{
if ( tok->str[0] == '{' )
++indentlevel;
else if ( tok->str[0] == '}' )
{
--indentlevel;
if ( indentlevel <= 0 )
break;
}
}
if ( tok == NULL )
return NULL;
continue;
}
}
if ( tok->str[0] == '}' )
{
indentlevel--;
if ( indentlevel < 0 )
return NULL;
}
if ( indentlevel == 1 )
{
// Member function implemented in the class declaration?
if ( Match( tok, "%var1% (", _funcname ) )
{
const TOKEN *tok2 = tok;
while ( tok2 && tok2->str[0] != '{' && tok2->str[0] != ';' )
tok2 = tok2->next;
if ( tok2 && tok2->str[0] == '{' )
return tok;
}
}
else if ( indentlevel == 0 && Match(tok, "%var1% :: %var2% (", _classname, _funcname) )
{
return tok;
}
}
// Not found
return NULL;
}
//---------------------------------------------------------------------------
void CheckClass::InitVar(struct VAR *varlist, const char varname[])
{
for (struct VAR *var = varlist; var; var = var->next)
{
if ( strcmp(var->name, varname) == 0 )
{
var->init = true;
break;
}
}
}
//---------------------------------------------------------------------------
void CheckClass::ClassChecking_VarList_Initialize(const TOKEN *tok1, const TOKEN *ftok, struct VAR *varlist, const char classname[], std::list<std::string> &callstack)
{
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 && Match(ftok, "%var% ("))
{
InitVar( varlist, ftok->str );
}
Assign |= (ftok->str[0] == ':');
}
if (ftok->str[0] == '{')
{
indentlevel++;
Assign = false;
}
if (ftok->str[0] == '}')
{
if (indentlevel <= 1)
break;
indentlevel--;
}
if ( indentlevel < 1 )
continue;
// Before a new statement there is "[{};)=]" or "else"
if ( ! Match(ftok, "[{};)=]") && ! Match(ftok, "else") )
continue;
// Using the operator= function to initialize all variables..
if ( Match(ftok->next, "* this = ") )
{
for (struct VAR *var = varlist; var; var = var->next)
var->init = true;
break;
}
if (!Match(ftok->next, "%var%") && !Match(ftok->next, "this . %var%"))
continue;
// Goto the first token in this statement..
ftok = ftok->next;
// Skip "this->"
if ( Match(ftok, "this .") )
ftok = Tokenizer::gettok(ftok, 2);
// Clearing all variables..
if (Match(ftok,"memset ( this ,"))
{
for (struct VAR *var = varlist; var; var = var->next)
var->init = true;
break;
}
// Calling member function?
else if (Match(ftok, "%var% ("))
{
// No recursive calls!
if ( std::find(callstack.begin(),callstack.end(),ftok->str) == callstack.end() )
{
callstack.push_back( ftok->str );
int i = 0;
const TOKEN *ftok2 = FindClassFunction( tok1, classname, ftok->str, i );
ClassChecking_VarList_Initialize(tok1, ftok2, varlist, classname, callstack);
}
}
// Assignment of member variable?
else if (Match(ftok, "%var% ="))
{
InitVar( varlist, ftok->str );
}
// The functions 'clear' and 'Clear' are supposed to initialize variable.
if (Match(ftok,"%var% . clear (") || Match(ftok,"%var% . Clear ("))
{
InitVar( varlist, ftok->str );
}
}
}
//---------------------------------------------------------------------------
// ClassCheck: Check that all class constructors are ok.
//---------------------------------------------------------------------------
void CheckClass::CheckConstructors()
{
// Locate class
const char *pattern_classname[] = {"class","","{",NULL};
const TOKEN *tok1 = Tokenizer::findtoken(tokens, pattern_classname);
while (tok1)
{
const char *classname = tok1->next->str;
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if ( ! IsName(classname) )
{
tok1 = Tokenizer::findtoken( tok1->next, pattern_classname );
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continue;
}
// Are there a class constructor?
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const char *constructor_pattern[] = {"","clKalle","(",NULL};
constructor_pattern[1] = classname;
const TOKEN *constructor_token = Tokenizer::findtoken( tokens, constructor_pattern );
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while ( constructor_token && constructor_token->str[0] == '~' )
constructor_token = Tokenizer::findtoken( constructor_token->next, constructor_pattern );
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if ( ! constructor_token )
{
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// There's no class constructor
if ( CheckCodingStyle )
{
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// Check that all member variables are initialized..
struct VAR *varlist = ClassChecking_GetVarList(tok1);
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if ( varlist )
{
std::ostringstream ostr;
ostr << FileLine(tok1);
ostr << " The class '" << classname << "' has no constructor";
ReportErr(ostr.str());
}
// Delete the varlist..
while (varlist)
{
struct VAR *nextvar = varlist->next;
delete varlist;
varlist = nextvar;
}
}
tok1 = Tokenizer::findtoken( tok1->next, pattern_classname );
continue;
}
// Check that all member variables are initialized..
struct VAR *varlist = ClassChecking_GetVarList(tok1);
int indentlevel = 0;
constructor_token = FindClassFunction( tok1, classname, classname, indentlevel );
std::list<std::string> callstack;
ClassChecking_VarList_Initialize(tok1, constructor_token, varlist, classname, callstack);
while ( constructor_token )
{
// Check if any variables are uninitialized
for (struct VAR *var = varlist; var; var = var->next)
{
// Is it a static member variable?
const char *pattern[] = {"","::","","=",NULL};
pattern[0] = classname;
pattern[2] = var->name;
if (Tokenizer::findtoken(tokens, pattern))
continue;
if (!var->init)
{
std::ostringstream ostr;
ostr << FileLine(constructor_token);
ostr << " Uninitialized member variable '" << classname << "::" << var->name << "'";
ReportErr(ostr.str());
}
}
for ( struct VAR *var = varlist; var; var = var->next )
var->init = false;
constructor_token = FindClassFunction( constructor_token->next, classname, classname, indentlevel );
ClassChecking_VarList_Initialize(tok1, constructor_token, varlist, classname, callstack);
}
// Delete the varlist..
while (varlist)
{
struct VAR *nextvar = varlist->next;
delete varlist;
varlist = nextvar;
}
tok1 = Tokenizer::findtoken( tok1->next, pattern_classname );
}
}
//---------------------------------------------------------------------------
// ClassCheck: Unused private functions
//---------------------------------------------------------------------------
void CheckClass::CheckUnusedPrivateFunctions()
{
// Locate some class
const char *pattern_class[] = {"class","","{",NULL};
for (const TOKEN *tok1 = Tokenizer::findtoken(tokens, pattern_class); tok1; tok1 = Tokenizer::findtoken(tok1->next, pattern_class))
{
const char *classname = tok1->next->str;
// The class implementation must be available..
const char *pattern_classconstructor[] = {"","::","",NULL};
pattern_classconstructor[0] = classname;
pattern_classconstructor[2] = classname;
if (!Tokenizer::findtoken(tokens,pattern_classconstructor))
continue;
// Get private functions..
std::list<std::string> FuncList;
FuncList.clear();
bool priv = false;
unsigned int indent_level = 0;
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for (const TOKEN *tok = tok1; tok; tok = tok->next)
{
if (Match(tok,"friend %var%"))
{
// Todo: Handle friend classes
FuncList.clear();
break;
}
if (tok->str[0] == '{')
indent_level++;
if (tok->str[0] == '}')
{
if (indent_level <= 1)
break;
indent_level--;
}
if (strcmp(tok->str,"};") == 0)
break;
if (strcmp(tok->str,"private:") == 0)
priv = true;
else if (strcmp(tok->str,"public:") == 0)
priv = false;
else if (strcmp(tok->str,"protected:") == 0)
priv = false;
else if (priv && indent_level == 1)
{
if ( Match(tok, "typedef %type% (") )
tok = Tokenizer::gettok(tok, 2);
if (Match(tok, "%var% (") &&
!Match(tok,classname))
{
FuncList.push_back(tok->str);
}
}
}
// Check that all private functions are used..
const char *pattern_function[] = {"","::",NULL};
pattern_function[0] = classname;
bool HasFuncImpl = false;
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const TOKEN *ftok = tokens;
while (ftok)
{
ftok = Tokenizer::findtoken(ftok,pattern_function);
int numpar = 0;
while (ftok && ftok->str[0]!=';' && ftok->str[0]!='{')
{
if (ftok->str[0] == '(')
numpar++;
else if (ftok->str[0] == ')')
numpar--;
ftok = ftok->next;
}
if (!ftok)
break;
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if (ftok->str[0] != ';' && numpar == 0)
{
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HasFuncImpl = true;
indent_level = 0;
while (ftok)
{
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if (ftok->str[0] == '{')
indent_level++;
if (ftok->str[0] == '}')
{
if (indent_level<=1)
break;
indent_level--;
}
if (ftok->next && ftok->next->str[0] == '(')
FuncList.remove(ftok->str);
ftok = ftok->next;
}
}
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if (ftok)
ftok = ftok->next;
}
while (HasFuncImpl && !FuncList.empty())
{
bool fp = false;
// Final check; check if the function pointer is used somewhere..
const char *_pattern[] = {"=","",NULL};
_pattern[1] = FuncList.front().c_str();
fp |= (Tokenizer::findtoken(tokens, _pattern) != NULL);
_pattern[0] = "return";
fp |= (Tokenizer::findtoken(tokens, _pattern) != NULL);
_pattern[0] = "(";
fp |= (Tokenizer::findtoken(tokens, _pattern) != NULL);
_pattern[0] = ")";
fp |= (Tokenizer::findtoken(tokens, _pattern) != NULL);
_pattern[0] = ",";
fp |= (Tokenizer::findtoken(tokens, _pattern) != NULL);
if (!fp)
{
std::ostringstream ostr;
ostr << "Class '" << classname << "', unused private function: '" << FuncList.front() << "'";
ReportErr(ostr.str());
}
FuncList.pop_front();
}
}
}
//---------------------------------------------------------------------------
// ClassCheck: Check that memset is not used on classes
//---------------------------------------------------------------------------
void CheckClass::CheckMemset()
{
// Locate all 'memset' tokens..
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for (const TOKEN *tok = tokens; tok; tok = tok->next)
{
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if (!Match(tok,"memset") && !Match(tok,"memcpy") && !Match(tok,"memmove"))
continue;
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// Todo: Handle memcpy and memmove
const char *type = NULL;
if (Match(tok, "memset ( %var% , %num% , sizeof ( %type% ) )"))
type = Tokenizer::getstr(tok, 8);
else if (Match(tok, "memset ( & %var% , %num% , sizeof ( %type% ) )"))
type = Tokenizer::getstr(tok, 9);
else if (Match(tok, "memset ( %var% , %num% , sizeof ( struct %type% ) )"))
type = Tokenizer::getstr(tok, 9);
else if (Match(tok, "memset ( & %var% , %num% , sizeof ( struct %type% ) )"))
type = Tokenizer::getstr(tok, 10);
else if (Match(tok, "%type% ( %var% , %var% , sizeof ( %type% ) )"))
type = Tokenizer::getstr(tok, 8);
// No type defined => The tokens didn't match
if (!(type && type[0]))
continue;
// Warn if type is a class..
const char *pattern1[] = {"class","",NULL};
pattern1[1] = type;
if (Tokenizer::findtoken(tokens,pattern1))
{
std::ostringstream ostr;
ostr << FileLine(tok) << ": Using '" << tok->str << "' on class.";
ReportErr(ostr.str());
continue;
}
// Warn if type is a struct that contains any std::*
const char *pattern2[] = {"struct","","{",NULL};
pattern2[1] = type;
for (const TOKEN *tstruct = Tokenizer::findtoken(tokens, pattern2); tstruct; tstruct = tstruct->next)
{
if (tstruct->str[0] == '}')
break;
if (Match(tstruct, "std :: %type% %var% ;"))
{
std::ostringstream ostr;
ostr << FileLine(tok) << ": Using '" << tok->str << "' on struct that contains a 'std::" << Tokenizer::getstr(tstruct,2) << "'";
ReportErr(ostr.str());
break;
}
}
}
}
//---------------------------------------------------------------------------
// ClassCheck: "void operator=("
//---------------------------------------------------------------------------
void CheckClass::CheckOperatorEq1()
{
const char *pattern[] = {"void", "operator", "=", "(", NULL};
if (const TOKEN *tok = Tokenizer::findtoken(tokens,pattern))
{
std::ostringstream ostr;
ostr << FileLine(tok) << ": 'operator=' should return something";
ReportErr(ostr.str());
}
}