564 lines
18 KiB
C++
564 lines
18 KiB
C++
/*
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* c++check - c/c++ syntax checking
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* Copyright (C) 2007 Daniel Marjamäki
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/
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*/
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//---------------------------------------------------------------------------
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#include "CheckClass.h"
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#include "tokenize.h"
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#include "CommonCheck.h"
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#include <locale>
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#include <list>
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#include <string>
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#include <sstream>
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#include <cstring>
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#include <algorithm>
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#ifdef __BORLANDC__
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#include <ctype.h>
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#include <mem.h>
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#endif
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//---------------------------------------------------------------------------
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extern bool CheckCodingStyle;
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struct VAR
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{
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const char *name;
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bool init;
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struct VAR *next;
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};
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//---------------------------------------------------------------------------
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static struct VAR *ClassChecking_GetVarList(const char classname[])
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{
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// Locate class..
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const char *pattern[] = {"class","","{",0};
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pattern[1] = classname;
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const TOKEN *tok1 = findtoken(tokens, pattern);
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// Get variable list..
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struct VAR *varlist = NULL;
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unsigned int indentlevel = 0;
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for (const TOKEN *tok = tok1; tok; tok = tok->next)
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{
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if (!tok->next)
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break;
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if (tok->str[0] == '{')
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indentlevel++;
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if (tok->str[0] == '}')
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{
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if (indentlevel <= 1)
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break;
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indentlevel--;
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}
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if (indentlevel==1 && (strchr(";{}", tok->str[0]) || (tok->str[0]!=':' && strchr(tok->str, ':'))))
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{
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const TOKEN *next = tok->next;
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const char *varname = 0;
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// Is it a variable declaration?
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if ( Match(next,"%type% %var% ;") )
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{
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const char *types[] = {"bool", "char", "int", "short", "long", "float", "double", 0};
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for ( int type = 0; types[type]; type++ )
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{
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if ( strcmp(next->str, types[type]) == 0)
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{
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varname = next->next->str;
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break;
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}
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}
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}
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// Pointer?
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else if ( Match(next, "%type% * %var% ;") )
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{
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varname = getstr(next, 2);
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}
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if (varname)
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{
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struct VAR *var = new VAR;
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memset(var, 0, sizeof(struct VAR));
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var->name = varname;
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var->init = false;
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var->next = varlist;
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varlist = var;
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}
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}
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}
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return varlist;
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}
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//---------------------------------------------------------------------------
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static const TOKEN * FindClassFunction( const TOKEN *_tokens, const char classname[], const char funcname[], unsigned int &indentlevel )
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{
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const char *_classname[2] = {0,0};
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const char *_funcname[2] = {0,0};
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_classname[0] = classname;
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_funcname[0] = funcname;
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while ( _tokens )
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{
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if ( indentlevel > 0 )
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{
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if ( _tokens->str[0] == '{' )
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indentlevel++;
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else if ( _tokens->str[0] == '}' )
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indentlevel--;
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else if ( indentlevel == 1 )
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{
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// Member function is implemented in the class declaration..
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if ( Match( _tokens, "%var1% (", _funcname ) )
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{
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const TOKEN *tok2 = _tokens;
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while ( tok2 && tok2->str[0] != '{' && tok2->str[0] != ';' )
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tok2 = tok2->next;
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if ( tok2 && tok2->str[0] == '{' )
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return _tokens;
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}
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}
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}
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else if ( Match(_tokens, "class %var1% {", _classname) )
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{
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indentlevel = 1;
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_tokens = gettok( _tokens, 2 );
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}
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else if ( Match(_tokens, "%var1% :: %var2% (", _classname, _funcname) )
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{
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return _tokens;
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}
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_tokens = _tokens->next;
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}
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// Not found
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return NULL;
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}
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//---------------------------------------------------------------------------
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static void InitVar(struct VAR *varlist, const char varname[])
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{
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for (struct VAR *var = varlist; var; var = var->next)
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{
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if ( strcmp(var->name, varname) == 0 )
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{
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var->init = true;
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break;
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}
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}
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}
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//---------------------------------------------------------------------------
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static void ClassChecking_VarList_Initialize(const TOKEN *ftok, struct VAR *varlist, const char classname[], std::list<std::string> &callstack)
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{
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bool Assign = false;
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unsigned int indentlevel = 0;
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for (; ftok; ftok = ftok->next)
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{
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if (!ftok->next)
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break;
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// Class constructor.. initializing variables like this
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// clKalle::clKalle() : var(value) { }
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if (indentlevel==0)
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{
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if (Assign && Match(ftok, "%var% ("))
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{
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InitVar( varlist, ftok->str );
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}
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Assign |= (ftok->str[0] == ':');
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}
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if (ftok->str[0] == '{')
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{
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indentlevel++;
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Assign = false;
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}
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if (ftok->str[0] == '}')
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{
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if (indentlevel <= 1)
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break;
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indentlevel--;
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}
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if (indentlevel>=1 && Match(ftok, "[{};] %var%"))
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{
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ftok = ftok->next;
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// Clearing all variables..
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if (Match(ftok,"memset ( this ,"))
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{
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for (struct VAR *var = varlist; var; var = var->next)
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var->init = true;
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}
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// Calling member function?
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else if (Match(ftok, "%var% ("))
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{
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// No recursive calls!
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if ( std::find(callstack.begin(),callstack.end(),ftok->str) == callstack.end() )
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{
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callstack.push_back( ftok->str );
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unsigned int i = 0;
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const TOKEN *ftok2 = FindClassFunction( tokens, classname, ftok->str, i );
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ClassChecking_VarList_Initialize(ftok2, varlist, classname, callstack);
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}
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}
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// Assignment of member variable?
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else if (Match(ftok, "%var% ="))
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{
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InitVar( varlist, ftok->str );
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}
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// The functions 'clear' and 'Clear' are supposed to initialize variable.
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if (Match(ftok,"%var% . clear (") || Match(ftok,"%var% . Clear ("))
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{
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InitVar( varlist, ftok->str );
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}
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}
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}
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}
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//---------------------------------------------------------------------------
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// ClassCheck: Check that all class constructors are ok.
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//---------------------------------------------------------------------------
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void CheckConstructors()
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{
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// Locate class
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const char *pattern_classname[] = {"class","","{",NULL};
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const TOKEN *tok1 = findtoken(tokens, pattern_classname);
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while (tok1)
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{
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const char *classname = tok1->next->str;
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if ( ! IsName(classname) )
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{
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tok1 = findtoken( tok1->next, pattern_classname );
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continue;
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}
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// Are there a class constructor?
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const char *constructor_pattern[] = {"","clKalle","(",NULL};
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constructor_pattern[1] = classname;
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const TOKEN *constructor_token = findtoken( tokens, constructor_pattern );
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while ( constructor_token && constructor_token->str[0] == '~' )
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constructor_token = findtoken( constructor_token->next, constructor_pattern );
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if ( ! constructor_token )
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{
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// There's no class constructor
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if ( CheckCodingStyle )
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{
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// Check that all member variables are initialized..
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struct VAR *varlist = ClassChecking_GetVarList(classname);
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if ( varlist )
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{
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std::ostringstream ostr;
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ostr << FileLine(tok1);
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ostr << " The class '" << classname << "' has no constructor";
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ReportErr(ostr.str());
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}
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// Delete the varlist..
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while (varlist)
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{
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struct VAR *nextvar = varlist->next;
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delete varlist;
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varlist = nextvar;
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}
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}
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tok1 = findtoken( tok1->next, pattern_classname );
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continue;
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}
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// Check that all member variables are initialized..
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struct VAR *varlist = ClassChecking_GetVarList(classname);
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unsigned int indentlevel = 0;
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constructor_token = FindClassFunction( tokens, classname, classname, indentlevel );
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std::list<std::string> callstack;
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ClassChecking_VarList_Initialize(constructor_token, varlist, classname, callstack);
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while ( constructor_token )
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{
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// Check if any variables are uninitialized
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for (struct VAR *var = varlist; var; var = var->next)
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{
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// Is it a static member variable?
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const char *pattern[] = {"","::","","=",NULL};
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pattern[0] = classname;
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pattern[2] = var->name;
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if (findtoken(tokens, pattern))
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continue;
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if (!var->init)
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{
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std::ostringstream ostr;
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ostr << FileLine(constructor_token);
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ostr << " Uninitialized member variable '" << classname << "::" << var->name << "'";
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ReportErr(ostr.str());
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}
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}
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for ( struct VAR *var = varlist; var; var = var->next )
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var->init = false;
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constructor_token = FindClassFunction( constructor_token->next, classname, classname, indentlevel );
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ClassChecking_VarList_Initialize(constructor_token, varlist, classname, callstack);
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}
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// Delete the varlist..
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while (varlist)
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{
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struct VAR *nextvar = varlist->next;
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delete varlist;
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varlist = nextvar;
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}
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tok1 = findtoken( tok1->next, pattern_classname );
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}
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}
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//---------------------------------------------------------------------------
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// ClassCheck: Unused private functions
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//---------------------------------------------------------------------------
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void CheckUnusedPrivateFunctions()
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{
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// Locate some class
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const char *pattern_class[] = {"class","","{",NULL};
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for (const TOKEN *tok1 = findtoken(tokens, pattern_class); tok1; tok1 = findtoken(tok1->next, pattern_class))
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{
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const char *classname = tok1->next->str;
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// The class implementation must be available..
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const char *pattern_classconstructor[] = {"","::","",NULL};
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pattern_classconstructor[0] = classname;
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pattern_classconstructor[2] = classname;
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if (!findtoken(tokens,pattern_classconstructor))
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continue;
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// Get private functions..
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std::list<std::string> FuncList;
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FuncList.clear();
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bool priv = false;
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unsigned int indent_level = 0;
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for (const TOKEN *tok = tok1; tok; tok = tok->next)
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{
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if (Match(tok,"friend %var%"))
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{
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// Todo: Handle friend classes
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FuncList.clear();
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break;
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}
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if (tok->str[0] == '{')
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indent_level++;
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if (tok->str[0] == '}')
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{
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if (indent_level <= 1)
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break;
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indent_level--;
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}
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if (strcmp(tok->str,"};") == 0)
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break;
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if (strcmp(tok->str,"private:") == 0)
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priv = true;
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else if (strcmp(tok->str,"public:") == 0)
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priv = false;
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else if (strcmp(tok->str,"protected:") == 0)
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priv = false;
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else if (priv && indent_level == 1)
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{
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if (isalpha(tok->str[0]) &&
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tok->next->str[0]=='(' &&
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strcmp(tok->str,classname) != 0)
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{
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FuncList.push_back(tok->str);
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}
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}
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}
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// Check that all private functions are used..
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const char *pattern_function[] = {"","::",NULL};
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pattern_function[0] = classname;
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bool HasFuncImpl = false;
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for (const TOKEN *ftok = findtoken(tokens, pattern_function); ftok; ftok = findtoken(ftok->next,pattern_function))
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{
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int numpar = 0;
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while (ftok && ftok->str[0]!=';' && ftok->str[0]!='{')
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{
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if (ftok->str[0] == '(')
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numpar++;
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else if (ftok->str[0] == ')')
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numpar--;
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ftok = ftok->next;
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}
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if (!ftok)
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break;
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if (ftok->str[0] == ';')
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continue;
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if (numpar != 0)
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continue;
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HasFuncImpl = true;
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indent_level = 0;
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while (ftok)
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{
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if (ftok->str[0] == '{')
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indent_level++;
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if (ftok->str[0] == '}')
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{
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if (indent_level<=1)
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break;
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indent_level--;
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}
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if (ftok->next && ftok->next->str[0] == '(')
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FuncList.remove(ftok->str);
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ftok = ftok->next;
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}
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}
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while (HasFuncImpl && !FuncList.empty())
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{
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bool fp = false;
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// Final check; check if the function pointer is used somewhere..
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const char *_pattern[] = {"=","",NULL};
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_pattern[1] = FuncList.front().c_str();
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fp |= (findtoken(tokens, _pattern) != NULL);
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_pattern[0] = "(";
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fp |= (findtoken(tokens, _pattern) != NULL);
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_pattern[0] = ")";
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fp |= (findtoken(tokens, _pattern) != NULL);
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_pattern[0] = ",";
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fp |= (findtoken(tokens, _pattern) != NULL);
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if (!fp)
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{
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std::ostringstream ostr;
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ostr << "Class '" << classname << "', unused private function: '" << FuncList.front() << "'";
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ReportErr(ostr.str());
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}
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FuncList.pop_front();
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}
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}
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}
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//---------------------------------------------------------------------------
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// ClassCheck: Check that memset is not used on classes
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//---------------------------------------------------------------------------
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void CheckMemset()
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{
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// Locate all 'memset' tokens..
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for (const TOKEN *tok = tokens; tok; tok = tok->next)
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{
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if (!Match(tok,"memset") && !Match(tok,"memcpy") && !Match(tok,"memmove"))
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continue;
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// Todo: Handle memcpy and memmove
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const char *type = NULL;
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if (Match(tok, "memset ( %var% , %num% , sizeof ( %type% ) )"))
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type = getstr(tok, 8);
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else if (Match(tok, "memset ( & %var% , %num% , sizeof ( %type% ) )"))
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type = getstr(tok, 9);
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else if (Match(tok, "memset ( %var% , %num% , sizeof ( struct %type% ) )"))
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type = getstr(tok, 9);
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else if (Match(tok, "memset ( & %var% , %num% , sizeof ( struct %type% ) )"))
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type = getstr(tok, 10);
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else if (Match(tok, "%type% ( %var% , %var% , sizeof ( %type% ) )"))
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type = getstr(tok, 8);
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// No type defined => The tokens didn't match
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if (!(type && type[0]))
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continue;
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// Warn if type is a class..
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const char *pattern1[] = {"class","",NULL};
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pattern1[1] = type;
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if (findtoken(tokens,pattern1))
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{
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std::ostringstream ostr;
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ostr << FileLine(tok) << ": Using '" << tok->str << "' on class.";
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ReportErr(ostr.str());
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continue;
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}
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// Warn if type is a struct that contains any std::*
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const char *pattern2[] = {"struct","","{",NULL};
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pattern2[1] = type;
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for (const TOKEN *tstruct = findtoken(tokens, pattern2); tstruct; tstruct = tstruct->next)
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{
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if (tstruct->str[0] == '}')
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break;
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if (Match(tstruct, "std :: %type% %var% ;"))
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{
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std::ostringstream ostr;
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ostr << FileLine(tok) << ": Using '" << tok->str << "' on struct that contains a 'std::" << getstr(tstruct,2) << "'";
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ReportErr(ostr.str());
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break;
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}
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}
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}
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}
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//---------------------------------------------------------------------------
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// ClassCheck: "void operator=("
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//---------------------------------------------------------------------------
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void CheckOperatorEq1()
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{
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const char *pattern[] = {"void", "operator", "=", "(", NULL};
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if (const TOKEN *tok = findtoken(tokens,pattern))
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{
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std::ostringstream ostr;
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ostr << FileLine(tok) << ": 'operator=' should return something";
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ReportErr(ostr.str());
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}
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}
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