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cppcheck/main.cpp

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#include <fstream>
#include <iostream>
#include <list>
#include <sstream>
#include <string>
#include <vector>
#include <ctype.h>
#include <string.h>
//---------------------------------------------------------------------------
std::vector<std::string> Files;
static bool Debug = false;
//---------------------------------------------------------------------------
struct TOKEN
{
unsigned int FileIndex;
char *str;
unsigned int linenr;
struct TOKEN *next;
};
struct TOKEN *tokens, *tokens_back;
void Tokenize(const char FileName[]);
//---------------------------------------------------------------------------
std::vector<std::string> VariableNames;
struct STATEMENT
{
enum etype {OBRACE, EBRACE, DECL, ASSIGN, NEW, DELETE, NEWARRAY, DELETEARRAY};
etype Type;
unsigned int VarIndex;
TOKEN *Token;
};
std::list<STATEMENT> Statements;
void CreateStatementList();
//---------------------------------------------------------------------------
// Memory leak..
void CheckMemoryLeak();
// Class
void CheckConstructors();
void CheckUnusedPrivateFunctions();
void CheckMemset();
void CheckOperatorEq1(); // Warning upon "void operator=(.."
// Casting
void WarningOldStylePointerCast();
// Headers..
void WarningHeaderWithImplementation();
void WarningIncludeHeader();
// Use standard functions instead
void WarningIsDigit();
// Redundant code
void WarningRedundantCode();
//---------------------------------------------------------------------------
static void CppCheck(const char FileName[]);
int main(int argc, char* argv[])
{
Debug = (argc == 3 && strcmp(argv[1], "--debug")==0);
if (argc == 1 || argc > 3)
{
std::cout << "Syntax:\n checkcode filename\n";
return 0;
}
CppCheck(argv[argc - 1]);
return 0;
}
static void CppCheck(const char FileName[])
{
tokens = tokens_back = NULL;
Files.clear();
Tokenize(FileName);
CreateStatementList();
// Memory leak
CheckMemoryLeak();
//std::ofstream f("tokens.txt");
//for (TOKEN *tok = tokens; tok; tok = tok->next)
// f << "[" << Files[tok->FileIndex] << ":" << tok->linenr << "]:" << tok->str << '\n';
//f.close();
// Check that all class constructors are ok.
// Temporarily inactivated to avoid any false positives
//CheckConstructors();
// Check that all private functions are called.
// Temporarily inactivated to avoid any false positives
CheckUnusedPrivateFunctions();
// Check that the memsets are valid.
// This function can do dangerous things if used wrong.
CheckMemset();
CheckOperatorEq1();
// Found implementation in header
// Since this is not a bug I am not enabling it right now
//WarningHeaderWithImplementation();
// Warning upon c-style pointer casts
const char *ext = strrchr(FileName, '.');
if (ext && stricmp(ext,".c"))
WarningOldStylePointerCast();
// Use standard functions instead
WarningIsDigit();
// Including header
//WarningIncludeHeader();
// if (a) delete a;
WarningRedundantCode();
// Clean up tokens..
while (tokens)
{
TOKEN *next = tokens->next;
free(tokens->str);
delete tokens;
tokens = next;
}
}
//---------------------------------------------------------------------------
void addtoken(const char str[], const unsigned int lineno, const unsigned int fileno)
{
if (str[0] == 0)
return;
TOKEN *newtoken = new TOKEN;
memset(newtoken, 0, sizeof(TOKEN));
newtoken->str = strdup(str);
newtoken->linenr = lineno;
newtoken->FileIndex = fileno;
if (tokens_back)
{
tokens_back->next = newtoken;
tokens_back = newtoken;
}
else
{
tokens = tokens_back = newtoken;
}
}
//---------------------------------------------------------------------------
void combine_2tokens(TOKEN *tok, const char str1[], const char str2[])
{
if (!(tok && tok->next))
return;
if (strcmp(tok->str,str1) || strcmp(tok->next->str,str2))
return;
free(tok->str);
free(tok->next->str);
tok->str = static_cast<char *>(malloc(strlen(str1)+strlen(str2)+1));
strcpy(tok->str, str1);
strcat(tok->str, str2);
TOKEN *toknext = tok->next;
tok->next = toknext->next;
delete toknext;
}
//---------------------------------------------------------------------------
void Tokenize(const char FileName[])
{
// Has this file been tokenized already?
for (unsigned int i = 0; i < Files.size(); i++)
{
if ( stricmp(Files[i].c_str(), FileName) == 0 )
return;
}
std::ifstream fin(FileName);
if (!fin.is_open())
return;
unsigned int CurrentFile = Files.size();
Files.push_back(FileName);
unsigned int lineno = 1;
char CurrentToken[100];
memset(CurrentToken, 0, sizeof(CurrentToken));
char *pToken = CurrentToken;
for (char ch = (char)fin.get(); !fin.eof(); ch = (char)fin.get())
{
if (ch == '#' && !CurrentToken[0])
{
std::string line;
getline(fin,line);
line = "#" + line;
if (strncmp(line.c_str(),"#include",8)==0 &&
line.find("\"") != std::string::npos)
{
// Extract the filename
line.erase(0, line.find("\"")+1);
line.erase(line.find("\""));
}
// Relative path..
if (strchr(FileName,'\\'))
{
char path[1000];
memset(path,0,sizeof(path));
const char *p = strrchr(FileName, '\\');
memcpy(path, FileName, p-FileName+1);
line = path + line;
}
addtoken("#include", lineno, CurrentFile);
addtoken(line.c_str(), lineno, CurrentFile);
Tokenize(line.c_str());
lineno++;
continue;
}
if (ch == '\n')
{
// Add current token..
addtoken(CurrentToken, lineno++, CurrentFile);
memset(CurrentToken, 0, sizeof(CurrentToken));
pToken = CurrentToken;
continue;
}
// Comments..
if (ch == '/' && !fin.eof())
{
// Add current token..
addtoken(CurrentToken, lineno, CurrentFile);
memset(CurrentToken, 0, sizeof(CurrentToken));
pToken = CurrentToken;
// Read next character..
ch = (char)fin.get();
// If '//'..
if (ch == '/')
{
while (!fin.eof() && (char)fin.get()!='\n');
lineno++;
continue;
}
// If '/*'..
if (ch == '*')
{
char chPrev;
ch = chPrev = 'A';
while (!fin.eof() && (chPrev!='*' || ch!='/'))
{
chPrev = ch;
ch = (char)fin.get();
if (ch == '\n')
lineno++;
}
continue;
}
// Not a comment.. add token..
addtoken("/", lineno, CurrentFile);
}
// char..
if (ch == '\'')
{
// Add previous token
addtoken(CurrentToken, lineno, CurrentFile);
memset(CurrentToken, 0, sizeof(CurrentToken));
// Read this ..
CurrentToken[0] = ch;
CurrentToken[1] = (char)fin.get();
CurrentToken[2] = (char)fin.get();
if (CurrentToken[1] == '\\')
CurrentToken[3] = (char)fin.get();
// Add token and start on next..
addtoken(CurrentToken, lineno, CurrentFile);
memset(CurrentToken, 0, sizeof(CurrentToken));
pToken = CurrentToken;
continue;
}
// String..
if (ch == '\"')
{
addtoken(CurrentToken, lineno, CurrentFile);
memset(CurrentToken, 0, sizeof(CurrentToken));
pToken = CurrentToken;
bool special = false;
char c = ch;
do
{
// Append token..
*pToken = c;
pToken++;
// Special sequence '\.'
if (special)
special = false;
else
special = (c == '\\');
// Get next character
c = (char)fin.get();
}
while (special || c != '\"');
*pToken = '\"';
addtoken(CurrentToken, lineno, CurrentFile);
memset(CurrentToken, 0, sizeof(CurrentToken));
pToken = CurrentToken;
continue;
}
if (strchr("+-*/%&|^?!=<>[](){};:,.",ch))
{
addtoken(CurrentToken, lineno, CurrentFile);
memset(CurrentToken, 0, sizeof(CurrentToken));
CurrentToken[0] = ch;
addtoken(CurrentToken, lineno, CurrentFile);
memset(CurrentToken, 0, sizeof(CurrentToken));
pToken = CurrentToken;
continue;
}
if (std::isspace(ch) || std::iscntrl(ch))
{
addtoken(CurrentToken, lineno, CurrentFile);
pToken = CurrentToken;
memset(CurrentToken, 0, sizeof(CurrentToken));
continue;
}
*pToken = ch;
pToken++;
}
// Combine tokens..
for (TOKEN *tok = tokens; tok && tok->next; tok = tok->next)
{
combine_2tokens(tok, "<", "<");
combine_2tokens(tok, ">", ">");
combine_2tokens(tok, "&", "&");
combine_2tokens(tok, "|", "|");
combine_2tokens(tok, "+", "=");
combine_2tokens(tok, "-", "=");
combine_2tokens(tok, "*", "=");
combine_2tokens(tok, "/", "=");
combine_2tokens(tok, "&", "=");
combine_2tokens(tok, "|", "=");
combine_2tokens(tok, "=", "=");
combine_2tokens(tok, "!", "=");
combine_2tokens(tok, "<", "=");
combine_2tokens(tok, ">", "=");
combine_2tokens(tok, ":", ":");
combine_2tokens(tok, "-", ">");
combine_2tokens(tok, "private", ":");
combine_2tokens(tok, "protected", ":");
combine_2tokens(tok, "public", ":");
}
}
//---------------------------------------------------------------------------
void ReportErr(const std::string errmsg)
{
std::cerr << errmsg << std::endl;
}
//---------------------------------------------------------------------------
bool IsName(const char str[])
{
return (str[0]=='_' || isalpha(str[0]));
}
TOKEN *findtoken(TOKEN *tok1, const char *tokenstr[])
{
for (TOKEN *ret = tok1; ret; ret = ret->next)
{
unsigned int i = 0;
TOKEN *tok = ret;
while (tokenstr[i])
{
if (!tok)
return NULL;
if (*(tokenstr[i]) && strcmp(tokenstr[i],tok->str))
break;
tok = tok->next;
i++;
}
if (!tokenstr[i])
return ret;
}
return NULL;
}
static bool match(TOKEN *tok, const std::string pattern)
{
if (!tok)
return false;
const char *p = pattern.c_str();
while (*p)
{
char str[50];
char *s = str;
while (*p==' ')
p++;
while (*p && *p!=' ')
{
*s = *p;
s++;
p++;
}
*s = 0;
if (str[0] == 0)
return true;
if (strcmp(str,"var")==0 || strcmp(str,"type")==0)
{
if (!IsName(tok->str))
return false;
}
else if (strcmp(str,"num")==0)
{
if (!isdigit(tok->str[0]))
return false;
}
else if (strcmp(str, tok->str) != 0)
return false;
tok = tok->next;
if (!tok)
return false;
}
return true;
}
TOKEN *gettok(TOKEN *tok, int index)
{
while (tok && index>0)
{
tok = tok->next;
index--;
}
return tok;
}
const char *getstr(TOKEN *tok, int index)
{
tok = gettok(tok, index);
return tok ? tok->str : "";
}
std::string FileLine(TOKEN *tok)
{
std::ostringstream ostr;
ostr << "[" << Files[tok->FileIndex] << ":" << tok->linenr << "]";
return ostr.str();
}
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// Create statement list
//---------------------------------------------------------------------------
void AppendStatement(STATEMENT::etype Type, TOKEN *tok, std::string Var="")
{
STATEMENT NewStatement;
NewStatement.Type = Type;
NewStatement.Token = tok;
if (Var.empty())
{
NewStatement.VarIndex = 0;
}
else
{
bool Found = false;
for (unsigned int i = 0; i < VariableNames.size(); i++)
{
if (VariableNames[i] == Var)
{
Found = true;
NewStatement.VarIndex = i;
break;
}
}
if ( ! Found )
{
NewStatement.VarIndex = VariableNames.size();
VariableNames.push_back(Var);
}
}
Statements.push_back(NewStatement);
}
TOKEN *GotoNextStatement(TOKEN *tok)
{
if (tok && (tok->str[0]=='{' || tok->str[0]=='}'))
return tok->next;
if (tok)
tok = tok->next;
int parlevel = 0;
for (; tok; tok = tok->next)
{
if (tok->str[0] == '(')
parlevel++;
else if (tok->str[0] == ')')
parlevel--;
if (strchr("{}", tok->str[0]))
break;
if (tok->str[0] == ';')
{
while (tok && tok->str[0] == ';')
tok = tok->next;
break;
}
}
return tok;
}
void CreateStatementList()
{
// Clear lists..
VariableNames.clear();
Statements.clear();
int indentlevel = 0;
for (TOKEN *tok = tokens; tok; tok = GotoNextStatement(tok))
{
if (tok->str[0] == '{')
{
AppendStatement(STATEMENT::OBRACE, tok);
indentlevel++;
}
else if (tok->str[0] == '}')
{
AppendStatement(STATEMENT::EBRACE, tok);
indentlevel--;
}
else if (indentlevel >= 1)
{
// Declaring variables..
if (IsName(tok->str))
{
const char *str1 = getstr(tok, 1);
bool decl = IsName(str1) || str1[0]=='*';
for (TOKEN *tok2 = decl ? tok->next : NULL; tok2; tok2 = tok2->next)
{
if (tok2->str[0] == ';' || tok2->str[0] == '.')
break;
const char *str1 = getstr(tok2, 1);
if (IsName(tok2->str) && strchr("[=,;",str1[0]))
{
AppendStatement(STATEMENT::DECL, tok2, tok2->str);
while (tok2 && !strchr(",;", tok2->str[0]))
tok2 = tok2->next;
if (tok2->str[0] == ';')
break;
}
}
}
// Assign..
for (TOKEN *tok2 = tok; tok2; tok2 = tok2->next)
{
if (tok2->str[0]==';')
break;
if (!IsName(tok2->str))
continue;
// Get variable name..
std::ostringstream varname;
varname << tok2->str;
bool isname = true;
TOKEN *eq = NULL;
for (TOKEN *tok3 = tok2->next; tok3; tok3 = tok3->next)
{
if (tok3->str[0]==';' || tok3->str[0]=='*' || tok3->str[0]==',')
break;
if (strcmp(tok3->str,"=")==0)
{
eq = tok3;
break;
}
if (isname && IsName(tok3->str))
break;
isname = IsName(tok3->str);
varname << tok3->str;
}
// Equal with..
if (eq != NULL)
{
TOKEN *rs = eq->next;
if ( match(rs,"new type ;") )
AppendStatement(STATEMENT::NEW, tok2, varname.str());
else if ( match(rs, "new type (") )
AppendStatement(STATEMENT::NEW, tok2, varname.str());
else if ( match(rs, "new type [") )
AppendStatement(STATEMENT::NEWARRAY, tok2, varname.str());
else
AppendStatement(STATEMENT::ASSIGN, tok2, varname.str());
tok2 = eq;
}
}
// Delete..
for (TOKEN *tok2 = tok; tok2; tok2 = tok2->next)
{
if (tok2->str[0]==';')
break;
if (match(tok2,"delete var ;"))
AppendStatement(STATEMENT::DELETE, tok2, getstr(tok2,1));
if (match(tok2,"delete [ ] var ;"))
AppendStatement(STATEMENT::DELETEARRAY, tok2, getstr(tok2,3));
}
}
}
if (Debug)
{
std::list<STATEMENT>::const_iterator it;
for (it = Statements.begin(); it != Statements.end(); it++)
{
STATEMENT s = *it;
switch (s.Type)
{
case STATEMENT::OBRACE:
std::cout << "{\n";
break;
case STATEMENT::EBRACE:
std::cout << "}\n";
break;
case STATEMENT::DECL:
std::cout << "decl " << VariableNames[s.VarIndex] << "\n";
break;
case STATEMENT::ASSIGN:
std::cout << "assign " << VariableNames[s.VarIndex] << "\n";
break;
case STATEMENT::NEW:
std::cout << "new " << VariableNames[s.VarIndex] << "\n";
break;
case STATEMENT::NEWARRAY:
std::cout << "new[] " << VariableNames[s.VarIndex] << "\n";
break;
case STATEMENT::DELETE:
std::cout << "delete " << VariableNames[s.VarIndex] << "\n";
break;
case STATEMENT::DELETEARRAY:
std::cout << "delete[] " << VariableNames[s.VarIndex] << "\n";
break;
}
}
}
}
//---------------------------------------------------------------------------
struct VAR
{
bool is_class;
const char *name;
bool init;
bool is_pointer;
struct VAR *next;
};
//---------------------------------------------------------------------------
struct VAR *ClassChecking_GetVarList(const char classname[])
{
// Locate class..
const char *pattern[] = {"class","","{",NULL};
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;
}
//---------------------------------------------------------------------------
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.
if (stricmp(ftok->next->next->str,"clear") == 0)
{
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;
}
//---------------------------------------------------------------------------
// Memory leak..
//---------------------------------------------------------------------------
void CheckMemoryLeak()
{
struct _variable
{
int indentlevel;
unsigned int varindex;
enum {Any, Data, New, NewA} value;
};
std::vector<_variable *> varlist;
// Parse the statement list and locate memory leaks..
int indentlevel = 0;
std::list<STATEMENT>::const_iterator it;
for (it = Statements.begin(); it != Statements.end(); it++)
{
switch (it->Type)
{
case STATEMENT::OBRACE:
indentlevel++;
break;
case STATEMENT::EBRACE:
// Check if any variables go out of scope..
if (indentlevel >= 1)
{
for (unsigned int i = 0; i < varlist.size(); i++)
{
if (varlist[i]->indentlevel != indentlevel)
continue;
// This is highly inaccurate at the moment
if (Debug)
{
if (varlist[i]->value == _variable::New || varlist[i]->value == _variable::NewA)
{
std::ostringstream ostr;
ostr << "Memory leak:" << VariableNames[varlist[i]->varindex];
ReportErr(ostr.str());
}
}
// Delete this instance..
delete varlist[i];
varlist.erase(varlist.begin()+i);
}
}
indentlevel--;
break;
case STATEMENT::DECL:
if (indentlevel > 0)
{
_variable *NewVar = new _variable;
NewVar->indentlevel = indentlevel;
NewVar->varindex = it->VarIndex;
varlist.push_back(NewVar);
}
break;
case STATEMENT::NEW:
case STATEMENT::NEWARRAY:
case STATEMENT::DELETE:
case STATEMENT::DELETEARRAY:
for (unsigned int i = 0; i < varlist.size(); i++)
{
if ( varlist[i]->varindex == it->VarIndex )
{
bool isalloc = (varlist[i]->value==_variable::New || varlist[i]->value==_variable::NewA);
bool alloc = (it->Type==STATEMENT::NEW || it->Type==STATEMENT::NEWARRAY);
// Already allocated and then allocated again..
//bool err = (isalloc & alloc);
if (isalloc && !alloc)
{
// Check that the deallocation matches..
bool a1 = (varlist[i]->value == _variable::NewA);
bool a2 = (it->Type == STATEMENT::DELETEARRAY);
if (a1 != a2)
{
std::ostringstream ostr;
ostr << FileLine(it->Token) << ": Mismatching allocation and deallocation";
ReportErr(ostr.str());
}
}
if ( it->Type == STATEMENT::NEW )
varlist[i]->value = _variable::New;
if ( it->Type == STATEMENT::NEWARRAY )
varlist[i]->value = _variable::NewA;
if ( it->Type == STATEMENT::DELETE )
varlist[i]->value = _variable::Any;
if ( it->Type == STATEMENT::DELETEARRAY )
varlist[i]->value = _variable::Any;
break;
}
}
break;
}
}
}
//---------------------------------------------------------------------------
// 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 );
}
}
//---------------------------------------------------------------------------
// Check: 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 (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();
}
}
}
//---------------------------------------------------------------------------
// Class: 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;
}
}
}
}
//---------------------------------------------------------------------------
// Class: "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());
}
}
//---------------------------------------------------------------------------
// HEADERS - No implementation in a header
//---------------------------------------------------------------------------
void WarningHeaderWithImplementation()
{
for (TOKEN *tok = tokens; tok; tok = tok->next)
{
// Only interested in included file
if (tok->FileIndex == 0)
continue;
if (match(tok, ") {"))
{
std::ostringstream ostr;
ostr << FileLine(tok) << ": Found implementation in header";
ReportErr(ostr.str());
}
}
}
//---------------------------------------------------------------------------
// Warning on C-Style casts.. p = (kalle *)foo;
//---------------------------------------------------------------------------
void WarningOldStylePointerCast()
{
for (TOKEN *tok = tokens; tok; tok = tok->next)
{
// Old style pointer casting..
if (!match(tok, "( type * ) var"))
continue;
// Is "type" a class?
const char *pattern[] = {"class","",NULL};
pattern[1] = getstr(tok, 1);
if (!findtoken(tokens, pattern))
continue;
std::ostringstream ostr;
ostr << FileLine(tok) << ": C-style pointer casting";
ReportErr(ostr.str());
}
}
//---------------------------------------------------------------------------
// Use standard function "isdigit" instead
//---------------------------------------------------------------------------
void WarningIsDigit()
{
for (TOKEN *tok = tokens; tok; tok = tok->next)
{
bool err = false;
err |= match(tok, "var >= '0' && var <= '9'");
err |= match(tok, "* var >= '0' && * var <= '9'");
err |= match(tok, "( var >= '0' ) && ( var <= '9' )");
err |= match(tok, "( * var >= '0' ) && ( * var <= '9' )");
if (err)
{
std::ostringstream ostr;
ostr << FileLine(tok) << ": The condition can be simplified; use 'isdigit'";
ReportErr(ostr.str());
}
}
}
//---------------------------------------------------------------------------
void WarningIncludeHeader()
{
// Including..
for (TOKEN *includetok = tokens; includetok; includetok = includetok->next)
{
if (strcmp(includetok->str, "#include") != 0)
continue;
// Get fileindex of included file..
unsigned int hfile = 0;
const char *includefile = includetok->next->str;
while (hfile < Files.size())
{
if (stricmp(Files[hfile].c_str(), includefile) == 0)
break;
hfile++;
}
if (hfile == Files.size())
continue;
// This header is needed if:
// * It contains some needed class declaration
// * It contains some needed function declaration
// * It contains some needed constant value
// * It contains some needed variable
// * It contains some needed enum
bool Needed = false;
bool NeedDeclaration = false;
int indentlevel = 0;
for (TOKEN *tok1 = tokens; tok1; tok1 = tok1->next)
{
if (tok1->FileIndex != hfile)
continue;
if (!tok1->next)
continue;
if (!tok1->next->next)
continue;
// I'm only interested in stuff that is declared at indentlevel 0
if (tok1->str[0] == '{')
indentlevel++;
if (tok1->str[0] == '}')
indentlevel--;
if (indentlevel != 0)
continue;
// Class or namespace declaration..
if (match(tok1,"class var {") ||
match(tok1,"class var :") ||
match(tok1,"namespace var {"))
{
std::string classname = getstr(tok1, 1);
// Try to find class usage in "parent" file..
for (TOKEN *tok2 = tokens; tok2; tok2 = tok2->next)
{
if (tok2->FileIndex != includetok->FileIndex)
continue;
// Inheritage..
Needed |= match(tok2, "class var : " + classname);
Needed |= match(tok2, "class var : type " + classname);
// Allocating..
Needed |= match(tok2, "new " + classname);
// Using class..
Needed |= match(tok2, classname + " ::");
Needed |= match(tok2, classname + " var");
NeedDeclaration |= match(tok2, classname + " *");
}
if (Needed | NeedDeclaration)
break;
}
// Variable..
std::string varname = "";
if (match(tok1, "type var ;") || match(tok1, "type var ["))
varname = getstr(tok1, 1);
if (match(tok1, "type * var ;") || match(tok1, "type * var ["))
varname = getstr(tok1, 2);
if (!varname.empty())
{
for (TOKEN *tok2 = tokens; tok2; tok2 = tok2->next)
{
if (tok2->FileIndex != includetok->FileIndex)
continue;
NeedDeclaration |= (tok2->str == varname);
Needed |= match(tok2, varname + " .");
Needed |= match(tok2, varname + " ->");
Needed |= match(tok2, varname + " =");
}
if (Needed | NeedDeclaration)
break;
}
// enum
if (match(tok1,"enum var {"))
{
std::string enumname = getstr(tok1, 1);
// Try to find enum usage in "parent" file..
for (TOKEN *tok2 = tokens; tok2; tok2 = tok2->next)
{
if (tok2->FileIndex != includetok->FileIndex)
continue;
Needed |= (enumname == tok2->str);
}
if (Needed)
break;
}
}
// Not a header file?
if (includetok->FileIndex == 0)
Needed |= NeedDeclaration;
// Not needed!
if (!Needed)
{
std::ostringstream ostr;
ostr << FileLine(includetok) << ": The included header '" << includefile << "' is not needed";
if (NeedDeclaration)
ostr << " (but a declaration in it is needed)";
ReportErr(ostr.str());
}
}
}
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// Redundant code..
//---------------------------------------------------------------------------
void WarningRedundantCode()
{
for (TOKEN *tok = tokens; tok; tok = tok->next)
{
if (strcmp(tok->str,"if"))
continue;
const char *varname1 = NULL;
TOKEN *tok2 = NULL;
if (match(tok,"if ( var )"))
{
varname1 = getstr(tok, 2);
tok2 = gettok(tok, 4);
}
else if (match(tok,"if ( var != NULL )"))
{
varname1 = getstr(tok, 2);
tok2 = gettok(tok, 6);
}
if (varname1==NULL || tok2==NULL)
continue;
bool err = false;
if (match(tok2,"delete var ;"))
err = (strcmp(getstr(tok2,1),varname1)==0);
else if (match(tok2,"{ delete var ; }"))
err = (strcmp(getstr(tok2,2),varname1)==0);
else if (match(tok2,"free ( var )"))
err = (strcmp(getstr(tok2,2),varname1)==0);
else if (match(tok2,"{ free ( var ) ; }"))
err = (strcmp(getstr(tok2,3),varname1)==0);
if (err)
{
std::ostringstream ostr;
ostr << FileLine(tok) << ": Redundant condition. It is safe to deallocate a NULL pointer";
ReportErr(ostr.str());
}
}
}
//---------------------------------------------------------------------------
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