cppcheck/CheckClass.cpp

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//---------------------------------------------------------------------------
#include "CheckClass.h"
#include "tokenize.h"
#include "CommonCheck.h"
#include <locale>
#include <list>
#include <string>
#include <sstream>
//---------------------------------------------------------------------------
struct VAR
{
bool is_class;
const char *name;
bool init;
bool is_pointer;
struct VAR *next;
};
//---------------------------------------------------------------------------
static struct VAR *ClassChecking_GetVarList(const char classname[])
{
// Locate class..
const char *pattern[] = {"class","","{",0};
pattern[1] = classname;
TOKEN *tok1 = findtoken(tokens, pattern);
// All classes..
struct _class
{
const char *name;
struct _class *next;
};
struct _class *classes = NULL;
const char *pattern_anyclass[] = {"class","",NULL};
for (TOKEN *t = findtoken(tokens,pattern_anyclass); t; t = findtoken(t->next,pattern_anyclass))
{
_class *newclass = new _class;
newclass->name = t->next->str;
newclass->next = classes;
classes = newclass;
}
// Get variable list..
bool is_class = false;
bool is_pointer = false;
struct VAR *varlist = NULL;
unsigned int indentlevel = 0;
for (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 (strchr(";{}", tok->str[0]))
is_class = is_pointer = false;
else if (IsName(tok->str))
{
for (_class *c = classes; c; c = c->next)
is_class |= (strcmp(c->name, tok->str) == 0);
}
if (tok->str[0] == '*')
is_pointer = true;
// Member variable?
if ((indentlevel == 1) &&
(tok->next->str[0] == ';') &&
(IsName(tok->str)) &&
(strcmp(tok->str,"const") != 0 ))
{
struct VAR *var = new VAR;
memset(var, 0, sizeof(struct VAR));
var->name = tok->str;
var->next = varlist;
var->is_class = is_class;
var->is_pointer = is_pointer;
varlist = var;
}
}
while (classes)
{
_class *next = classes->next;
delete classes;
classes = next;
}
return varlist;
}
//---------------------------------------------------------------------------
static TOKEN * ClassChecking_VarList_RemoveAssigned(TOKEN *_tokens, struct VAR *varlist, const char classname[], const char funcname[])
{
// Locate class member function
const char *pattern[] = {"","::","","(",NULL};
pattern[0] = classname;
pattern[2] = funcname;
// Locate member function implementation..
TOKEN *ftok = findtoken(_tokens, pattern);
if (!ftok)
return NULL;
bool BeginLine = false;
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 && strcmp(classname,funcname)==0)
{
if (Assign &&
IsName(ftok->str) &&
ftok->next->str[0]=='(')
{
for (struct VAR *var = varlist; var; var = var->next)
{
if (strcmp(var->name,ftok->str))
continue;
var->init = true;
break;
}
}
Assign |= (ftok->str[0] == ':');
}
if (ftok->str[0] == '{')
{
indentlevel++;
Assign = false;
}
if (ftok->str[0] == '}')
{
if (indentlevel <= 1)
break;
indentlevel--;
}
if (BeginLine && indentlevel>=1 && IsName(ftok->str))
{
// Clearing all variables..
if (match(ftok,"memset ( this ,"))
{
for (struct VAR *var = varlist; var; var = var->next)
var->init = true;
}
// Calling member function?
if (ftok->next->str[0] == '(')
ClassChecking_VarList_RemoveAssigned(tokens, varlist, classname, ftok->str);
// Assignment of member variable?
if (strcmp(ftok->next->str, "=") == 0)
{
for (struct VAR *var = varlist; var; var = var->next)
{
if (strcmp(var->name,ftok->str))
continue;
var->init = true;
break;
}
}
// Calling member function..
if (strcmp(ftok->next->str,".")==0 || strcmp(ftok->next->str,"->")==0)
{
// The functions 'clear' and 'Clear' are supposed to initialize variable.
#ifdef __linux__
if( strcasecmp( ftok->next->next->str,"clear") == 0)
#else
if (stricmp(ftok->next->next->str,"clear") == 0)
#endif
{
for (struct VAR *var = varlist; var; var = var->next)
{
if (strcmp(var->name,ftok->str))
continue;
var->init = true;
break;
}
}
}
}
BeginLine = (strchr("{};", ftok->str[0]));
}
return ftok;
}
//---------------------------------------------------------------------------
// ClassCheck: Check that all class constructors are ok.
//---------------------------------------------------------------------------
void CheckConstructors()
{
// Locate class
const char *pattern_classname[] = {"class","","{",NULL};
TOKEN *tok1 = findtoken(tokens, pattern_classname);
while (tok1)
{
const char *classname = tok1->next->str;
// Are there a class constructor?
const char *pattern_constructor[] = {"clKalle","::","clKalle","(",NULL};
pattern_constructor[0] = classname;
pattern_constructor[2] = classname;
if (!findtoken(tokens,pattern_constructor))
{
// There's no class implementation, it must be somewhere else.
tok1 = findtoken( tok1->next, pattern_classname );
continue;
}
// Check that all member variables are initialized..
struct VAR *varlist = ClassChecking_GetVarList(classname);
ClassChecking_VarList_RemoveAssigned(tokens, varlist, classname, classname);
// Check if any variables are uninitialized
for (struct VAR *var = varlist; var; var = var->next)
{
if (!var->init && (var->is_pointer || !var->is_class))
{
std::ostringstream ostr;
ostr << "Uninitialized member variable '" << classname << "::" << var->name << "'";
ReportErr(ostr.str());
}
}
// Delete the varlist..
while (varlist)
{
struct VAR *nextvar = varlist->next;
delete varlist;
varlist = nextvar;
}
tok1 = findtoken( tok1->next, pattern_classname );
}
}
//---------------------------------------------------------------------------
// ClassCheck: Unused private functions
//---------------------------------------------------------------------------
void CheckUnusedPrivateFunctions()
{
// Locate some class
const char *pattern_class[] = {"class","","{",NULL};
for (TOKEN *tok1 = findtoken(tokens, pattern_class); tok1; tok1 = 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 (!findtoken(tokens,pattern_classconstructor))
continue;
// Get private functions..
std::list<std::string> FuncList;
FuncList.clear();
bool priv = false;
unsigned int indent_level = 0;
for (TOKEN *tok = tok1; tok; tok = tok->next)
{
if (match(tok,"friend class"))
{
// 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 (std::isalpha(tok->str[0]) &&
tok->next->str[0]=='(' &&
strcmp(tok->str,classname) != 0)
{
FuncList.push_back(tok->str);
}
}
}
// Check that all private functions are used..
const char *pattern_function[] = {"","::",NULL};
pattern_function[0] = classname;
bool HasFuncImpl = false;
for (TOKEN *ftok = findtoken(tokens, pattern_function); ftok; ftok = findtoken(ftok->next,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;
if (ftok->str[0] == ';')
continue;
if (numpar != 0)
continue;
HasFuncImpl = true;
indent_level = 0;
while (ftok)
{
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;
}
}
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 |= (findtoken(tokens, _pattern) != NULL);
_pattern[0] = "(";
fp |= (findtoken(tokens, _pattern) != NULL);
_pattern[0] = ")";
fp |= (findtoken(tokens, _pattern) != NULL);
_pattern[0] = ",";
fp |= (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 CheckMemset()
{
// Locate all 'memset' tokens..
for (TOKEN *tok = tokens; tok; tok = tok->next)
{
if (strcmp(tok->str,"memset")!=0)
continue;
const char *type = NULL;
if (match(tok, "memset ( var , num , sizeof ( type ) )"))
type = getstr(tok, 8);
else if (match(tok, "memset ( & var , num , sizeof ( type ) )"))
type = getstr(tok, 9);
else if (match(tok, "memset ( var , num , sizeof ( struct type ) )"))
type = getstr(tok, 9);
else if (match(tok, "memset ( & var , num , sizeof ( struct type ) )"))
type = getstr(tok, 10);
// No type defined => The tokens didn't match
if (!(type && type[0]))
continue;
// It will be assumed that memset can be used upon 'this'.
// Todo: Check this too
if (strcmp(getstr(tok,2),"this") == 0)
continue;
// Warn if type is a class..
const char *pattern1[] = {"class","",NULL};
pattern1[1] = type;
if (findtoken(tokens,pattern1))
{
std::ostringstream ostr;
ostr << FileLine(tok) << ": Using 'memset' on class.";
ReportErr(ostr.str());
}
// Warn if type is a struct that contains any std::*
const char *pattern2[] = {"struct","","{",NULL};
pattern2[1] = type;
for (TOKEN *tstruct = 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 'memset' on struct that contains a 'std::" << getstr(tstruct,2) << "'";
ReportErr(ostr.str());
break;
}
}
}
}
//---------------------------------------------------------------------------
// ClassCheck: "void operator=("
//---------------------------------------------------------------------------
void CheckOperatorEq1()
{
const char *pattern[] = {"void", "operator", "=", "(", NULL};
if (TOKEN *tok = findtoken(tokens,pattern))
{
std::ostringstream ostr;
ostr << FileLine(tok) << ": 'operator=' should return something";
ReportErr(ostr.str());
}
}