1404 lines
44 KiB
C++
1404 lines
44 KiB
C++
/*
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* cppcheck - c/c++ syntax checking
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* Copyright (C) 2007-2008 Daniel Marjamäki, Reijo Tomperi, Nicolas Le Cam
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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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#include "checkmemoryleak.h"
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#include <stdlib.h> // free
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#include <algorithm>
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#include <iostream>
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#include <sstream>
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#ifdef __BORLANDC__
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#include <mem.h> // <- memset
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#else
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#include <string.h>
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#endif
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//---------------------------------------------------------------------------
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CheckMemoryLeakClass::CheckMemoryLeakClass( const Tokenizer *tokenizer, const Settings &settings, ErrorLogger *errorLogger )
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: _settings(settings)
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{
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_tokenizer = tokenizer;
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_errorLogger = errorLogger;
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}
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CheckMemoryLeakClass::~CheckMemoryLeakClass()
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{
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}
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bool CheckMemoryLeakClass::isclass( const TOKEN *tok )
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{
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if ( tok->isStandardType() )
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return false;
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std::ostringstream pattern;
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pattern << "struct " << tok->str();
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if ( TOKEN::findmatch( _tokenizer->tokens(), pattern.str().c_str() ) )
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return false;
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return true;
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}
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//---------------------------------------------------------------------------
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CheckMemoryLeakClass::AllocType CheckMemoryLeakClass::GetAllocationType( const TOKEN *tok2 )
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{
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// What we may have...
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// * var = (char *)malloc(10);
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// * var = new char[10];
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// * var = strdup("hello");
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if ( tok2 && tok2->str() == "(" )
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{
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while ( tok2 && tok2->str() != ")" )
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tok2 = tok2->next();
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tok2 = tok2 ? tok2->next() : NULL;
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}
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if ( ! tok2 )
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return No;
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if ( ! tok2->isName() )
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return No;
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// Does tok2 point on "malloc", "strdup" or "kmalloc"..
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const char *mallocfunc[] = {"malloc",
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"calloc",
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"strdup",
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"kmalloc",
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"kzalloc",
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"kcalloc",
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0};
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for ( unsigned int i = 0; mallocfunc[i]; i++ )
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{
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if ( tok2->str() == mallocfunc[i] )
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return Malloc;
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}
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// Does tok2 point on "g_malloc", "g_strdup", ..
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const char *gmallocfunc[] = {"g_new",
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"g_new0",
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"g_try_new",
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"g_try_new0",
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"g_malloc",
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"g_malloc0",
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"g_try_malloc",
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"g_try_malloc0",
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"g_strdup",
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"g_strndup",
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0};
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for ( unsigned int i = 0; gmallocfunc[i]; i++ )
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{
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if ( tok2->str() == gmallocfunc[i] )
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return gMalloc;
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}
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if ( TOKEN::Match( tok2, "new %type% [;(]" ) )
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return New;
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if ( TOKEN::Match( tok2, "new %type% [" ) )
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return NewA;
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if ( TOKEN::Match( tok2, "fopen (" ) )
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return FOPEN;
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if ( TOKEN::Match( tok2, "popen (" ) )
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return POPEN;
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// Userdefined allocation function..
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std::list<AllocFunc>::const_iterator it = _listAllocFunc.begin();
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while ( it != _listAllocFunc.end() )
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{
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if ( tok2->str() == it->funcname )
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return it->alloctype;
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++it;
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}
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return No;
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}
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CheckMemoryLeakClass::AllocType CheckMemoryLeakClass::GetReallocationType( const TOKEN *tok2 )
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{
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// What we may have...
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// * var = (char *)realloc(..;
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if ( tok2 && tok2->str() == "(" )
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{
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while ( tok2 && tok2->str() != ")" )
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tok2 = tok2->next();
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tok2 = tok2 ? tok2->next() : NULL;
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}
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if ( ! tok2 )
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return No;
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if ( TOKEN::Match(tok2, "realloc") )
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return Malloc;
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// GTK memory reallocation..
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if ( TOKEN::Match(tok2, "g_realloc|g_try_realloc|g_renew|g_try_renew") )
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return gMalloc;
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return No;
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}
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CheckMemoryLeakClass::AllocType CheckMemoryLeakClass::GetDeallocationType( const TOKEN *tok, const char *varnames[] )
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{
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if ( TOKEN::Match(tok, "delete %var1% ;", varnames) )
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return New;
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if ( TOKEN::Match(tok, "delete [ ] %var1% ;", varnames) )
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return NewA;
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if ( TOKEN::Match(tok, "free ( %var1% ) ;", varnames) ||
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TOKEN::Match(tok, "kfree ( %var1% ) ;", varnames) )
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{
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return Malloc;
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}
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if ( TOKEN::Match(tok, "g_free ( %var1% ) ;", varnames) )
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return gMalloc;
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if ( TOKEN::Match(tok, "fclose ( %var1% )", varnames) )
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return FOPEN;
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if ( TOKEN::Match(tok, "pclose ( %var1% )", varnames) )
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return POPEN;
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return No;
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}
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//--------------------------------------------------------------------------
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const char * CheckMemoryLeakClass::call_func( const TOKEN *tok, std::list<const TOKEN *> callstack, const char *varnames[], AllocType &alloctype, AllocType &dealloctype )
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{
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// Keywords that are not function calls..
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if (TOKEN::Match(tok,"if|for|while"))
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return 0;
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// String functions that are not allocating nor deallocating memory..
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if (TOKEN::Match(tok, "strcpy|strncpy|strcat|strncat|strcmp|strncmp|strcasecmp|stricmp|sprintf|strchr|strrchr|strstr"))
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return 0;
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// Memory functions that are not allocating nor deallocating memory..
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if (TOKEN::Match(tok, "memset|memcpy|memmove|memchr"))
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return 0;
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// I/O functions that are not allocating nor deallocating memory..
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if (TOKEN::Match(tok, "fgets|fgetc|fputs|fputc|printf"))
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return 0;
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// Convert functions that are not allocating nor deallocating memory..
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if (TOKEN::Match(tok, "atoi|atof|atol|strtol|strtoul|strtod"))
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return 0;
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if (GetAllocationType(tok)!=No || GetReallocationType(tok)!=No || GetDeallocationType(tok,varnames)!=No)
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return 0;
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if ( callstack.size() > 2 )
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return "dealloc";
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const char *funcname = tok->aaaa();
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for ( std::list<const TOKEN *>::const_iterator it = callstack.begin(); it != callstack.end(); ++it )
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{
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if ( (*it)->str() == funcname )
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return "dealloc";
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}
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callstack.push_back(tok);
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int par = 1;
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int parlevel = 0;
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for ( ; tok; tok = tok->next() )
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{
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if ( tok->str() == "(" )
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++parlevel;
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else if ( tok->str() == ")" )
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{
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--parlevel;
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if ( parlevel < 1 )
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return NULL;
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}
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if ( parlevel == 1 )
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{
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if ( tok->str() == "," )
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++par;
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if ( TOKEN::Match(tok, "[,()] %var1% [,()]", varnames) )
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{
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const TOKEN *ftok = _tokenizer->GetFunctionTokenByName(funcname);
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const char *parname = Tokenizer::getParameterName( ftok, par );
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if ( ! parname )
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return "use";
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// Check if the function deallocates the variable..
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while ( ftok && (ftok->str() != "{") )
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ftok = ftok->next();
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TOKEN *func = getcode( ftok->tokAt(1), callstack, parname, alloctype, dealloctype );
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simplifycode( func );
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const TOKEN *func_ = func;
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while ( func_ && func_->str() == ";" )
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func_ = func_->next();
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/*
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for (const TOKEN *t = func; t; t = t->next())
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{
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std::cout << t->str() << "\n";
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}*/
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const char *ret = 0;
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if (TOKEN::findmatch(func_, "goto"))
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{
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// TODO : "goto" isn't handled well
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if ( TOKEN::findmatch(func_, "dealloc") )
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ret = "dealloc";
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else if ( TOKEN::findmatch(func_, "use") )
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ret = "use";
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}
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else if ( TOKEN::findmatch(func_, "dealloc") )
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ret = "dealloc";
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else if ( TOKEN::findmatch(func_, "use") )
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ret = "use";
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Tokenizer::deleteTokens(func);
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return ret;
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}
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}
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}
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return NULL;
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}
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//--------------------------------------------------------------------------
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void CheckMemoryLeakClass::MismatchError( const TOKEN *Tok1, const std::list<const TOKEN *> &callstack, const char varname[] )
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{
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std::ostringstream errmsg;
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for ( std::list<const TOKEN *>::const_iterator tok = callstack.begin(); tok != callstack.end(); ++tok )
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errmsg << _tokenizer->fileLine(*tok) << " -> ";
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errmsg << _tokenizer->fileLine(Tok1) << ": Mismatching allocation and deallocation: " << varname;
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_errorLogger->reportErr( errmsg.str() );
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}
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//---------------------------------------------------------------------------
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void CheckMemoryLeakClass::MemoryLeak( const TOKEN *tok, const char varname[], AllocType alloctype )
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{
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std::ostringstream errmsg;
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errmsg << _tokenizer->fileLine(tok);
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if( alloctype == CheckMemoryLeakClass::FOPEN ||
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alloctype == CheckMemoryLeakClass::POPEN )
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errmsg << ": Resource leak: ";
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else
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errmsg << ": Memory leak: ";
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errmsg << varname;
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_errorLogger->reportErr( errmsg.str() );
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}
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//---------------------------------------------------------------------------
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void CheckMemoryLeakClass::instoken(TOKEN *tok, const char str[])
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{
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tok->insertToken( str );
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}
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//---------------------------------------------------------------------------
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bool CheckMemoryLeakClass::notvar(const TOKEN *tok, const char *varnames[])
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{
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return bool( TOKEN::Match(tok, "! %var1% [;)&|]", varnames) ||
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TOKEN::Match(tok, "! ( %var1% )", varnames) ||
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TOKEN::Match(tok, "unlikely ( ! %var1% )", varnames) ||
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TOKEN::Match(tok, "unlikely ( %var1% == 0 )", varnames) ||
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TOKEN::Match(tok, "0 == %var1% [;)&|]", varnames) ||
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TOKEN::Match(tok, "%var1% == 0", varnames) );
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}
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TOKEN *CheckMemoryLeakClass::getcode(const TOKEN *tok, std::list<const TOKEN *> callstack, const char varname[], AllocType &alloctype, AllocType &dealloctype)
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{
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const char *varnames[2];
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varnames[0] = varname;
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varnames[1] = 0;
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TOKEN *rethead = 0, *rettail = 0;
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#define addtoken(_str) \
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{ \
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if (rettail) \
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{ \
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rettail->insertToken(_str); \
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rettail = rettail->next(); \
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} \
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else \
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{ \
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rethead = new TOKEN; \
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rettail = rethead; \
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rettail->setstr(_str); \
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} \
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\
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rettail->linenr( tok->linenr() ); \
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rettail->fileIndex( tok->fileIndex() ); \
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}
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// The first token should be ";"
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addtoken(";");
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bool isloop = false;
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int indentlevel = 0;
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int parlevel = 0;
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for ( ; tok; tok = tok->next() )
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{
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if ( tok->str() == "{" )
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{
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addtoken( "{" );
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indentlevel++;
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}
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else if ( tok->str() == "}" )
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{
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addtoken( "}" );
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if ( indentlevel <= 0 )
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break;
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indentlevel--;
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}
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if ( tok->str() == "(" )
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parlevel++;
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else if ( tok->str() == ")" )
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parlevel--;
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isloop &= ( parlevel > 0 );
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if ( parlevel == 0 && tok->str()==";")
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addtoken(";");
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if (TOKEN::Match(tok, "[(;{}] %var1% =", varnames))
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{
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AllocType alloc = GetAllocationType(tok->tokAt(3));
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if ( alloc == No )
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{
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alloc = GetReallocationType( tok->tokAt(3) );
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if ( alloc != No )
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{
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addtoken( "dealloc" );
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addtoken( ";" );
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}
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}
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// If "--all" hasn't been given, don't check classes..
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if ( alloc == New && ! _settings._showAll )
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{
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if ( TOKEN::Match(tok->tokAt(3), "new %type% [(;]") )
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{
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if ( isclass( tok->tokAt(4) ) )
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alloc = No;
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}
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}
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if ( alloc != No )
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{
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addtoken("alloc");
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if (alloctype!=No && alloctype!=alloc)
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MismatchError(tok, callstack, varname);
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if (dealloctype!=No && dealloctype!=alloc)
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MismatchError(tok, callstack, varname);
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alloctype = alloc;
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}
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// assignment..
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else
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{
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// is the pointer in rhs?
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bool rhs = false;
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for ( const TOKEN *tok2 = tok->tokAt(2); tok2; tok2 = tok2->next() )
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{
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if ( tok2->str() == ";" )
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break;
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if ( tok2->str() == varname )
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{
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rhs = true;
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break;
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}
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}
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addtoken( (rhs ? "use" : "assign") );
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}
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}
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if ( TOKEN::Match(tok->previous(), "[;{})] %var%") )
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{
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AllocType dealloc = GetDeallocationType(tok, varnames);
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if ( dealloc != No )
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{
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addtoken("dealloc");
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if (alloctype!=No && alloctype!=dealloc)
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MismatchError(tok, callstack, varname);
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if (dealloctype!=No && dealloctype!=dealloc)
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MismatchError(tok, callstack, varname);
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dealloctype = dealloc;
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continue;
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}
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}
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// if else switch
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if ( TOKEN::Match(tok, "if ( %var1% )", varnames) ||
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TOKEN::Match(tok, "if ( %var1% != 0 )", varnames) ||
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TOKEN::Match(tok, "if ( 0 != %var1% )", varnames) )
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{
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addtoken("if(var)");
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// Make sure the "use" will not be added
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while ( tok->str() != ")" )
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tok = tok->next();
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}
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else if ( TOKEN::Match(tok, "if (") && notvar(tok->tokAt(2), varnames) )
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{
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addtoken("if(!var)");
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}
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else if ( TOKEN::Match(tok, "if ( true )") )
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{
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addtoken("if(true)");
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}
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else if ( TOKEN::Match(tok, "if ( false )") )
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{
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addtoken("if(false)");
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}
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else if ( TOKEN::Match(tok, "if") )
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{
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// Check if the condition depends on var somehow..
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bool dep = false;
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int parlevel = 0;
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for ( const TOKEN *tok2 = tok; tok2; tok2 = tok2->next() )
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{
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if ( tok2->str() == "(" )
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++parlevel;
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if ( tok2->str() == ")" )
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{
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--parlevel;
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if ( parlevel <= 0 )
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break;
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}
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if ( (tok2->str() != ".") &&
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TOKEN::Match(tok2->next(), "%var1%", varnames) &&
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!TOKEN::Match(tok2->next(), "%var1% .", varnames) )
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{
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dep = true;
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break;
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}
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}
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addtoken( (dep ? "ifv" : "if") );
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}
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else if ( (tok->str() == "else") || (tok->str() == "switch") )
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{
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addtoken(tok->aaaa());
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}
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if ( (tok->str() == "case") )
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{
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addtoken("case");
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addtoken(";");
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}
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if ( (tok->str() == "default") )
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{
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addtoken("case");
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addtoken(";");
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}
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|
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// Loops..
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if ((tok->str() == "for") || (tok->str() == "while") )
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{
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addtoken("loop");
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isloop = true;
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}
|
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if ( (tok->str() == "do") )
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{
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addtoken("do");
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}
|
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if ( isloop && notvar(tok,varnames) )
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addtoken("!var");
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// continue / break..
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if ( tok->str() == "continue" )
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addtoken("continue");
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if ( tok->str() == "break" )
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addtoken("break");
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// goto..
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if ( tok->str() == "goto" )
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{
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addtoken("goto");
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}
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|
// Return..
|
|
if ( tok->str() == "return" )
|
|
{
|
|
addtoken("return");
|
|
if ( TOKEN::Match(tok, "return %var1%", varnames) ||
|
|
TOKEN::Match(tok, "return & %var1%", varnames) )
|
|
addtoken("use");
|
|
}
|
|
|
|
// throw..
|
|
if ( tok->str() == "throw" )
|
|
addtoken("throw");
|
|
|
|
// Assignment..
|
|
if ( TOKEN::Match(tok,"[)=] %var1% [;)]", varnames) ||
|
|
TOKEN::Match(tok, "%var1% +=|-=", varnames) )
|
|
addtoken("use");
|
|
|
|
// Investigate function calls..
|
|
if ( TOKEN::Match(tok, "%var% (") )
|
|
{
|
|
const char *str = call_func(tok, callstack, varnames, alloctype, dealloctype);
|
|
if ( str )
|
|
addtoken( str );
|
|
}
|
|
|
|
// Callback..
|
|
if ( TOKEN::Match(tok, "( * %var% ) (") ||
|
|
TOKEN::Match(tok, "( %var% ) (") )
|
|
{
|
|
for ( const TOKEN *tok2 = tok->tokAt(4); tok2; tok2 = tok2->next() )
|
|
{
|
|
if ( TOKEN::Match(tok2, "[;{]") )
|
|
break;
|
|
else if ( tok2->str() == varname )
|
|
{
|
|
addtoken("use");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Linux lists..
|
|
if ( TOKEN::Match( tok, "[=(,] & %var1% [.[]", varnames ) )
|
|
{
|
|
// todo: better checking
|
|
addtoken("use");
|
|
}
|
|
}
|
|
|
|
return rethead;
|
|
}
|
|
|
|
void CheckMemoryLeakClass::erase(TOKEN *begin, const TOKEN *end)
|
|
{
|
|
TOKEN::eraseTokens( begin, end );
|
|
}
|
|
|
|
void CheckMemoryLeakClass::simplifycode(TOKEN *tok)
|
|
{
|
|
// reduce the code..
|
|
bool done = false;
|
|
while ( ! done )
|
|
{
|
|
done = true;
|
|
|
|
for ( TOKEN *tok2 = tok; tok2; tok2 = tok2 ? tok2->next() : NULL )
|
|
{
|
|
// Delete extra ";"
|
|
while (TOKEN::Match(tok2,"[;{}] ;"))
|
|
{
|
|
erase(tok2, tok2->tokAt(2));
|
|
done = false;
|
|
}
|
|
|
|
// Replace "{ }" with ";"
|
|
if ( TOKEN::Match(tok2->next(), "{ }") )
|
|
{
|
|
tok2->next()->setstr(";");
|
|
erase(tok2->next(), tok2->tokAt(3));
|
|
done = false;
|
|
}
|
|
|
|
// Delete braces around a single instruction..
|
|
if ( TOKEN::Match(tok2->next(), "{ %var% ; }") )
|
|
{
|
|
erase( tok2, tok2->tokAt(2) );
|
|
erase( tok2->next()->next(), tok2->tokAt(4) );
|
|
done = false;
|
|
}
|
|
if ( TOKEN::Match(tok2->next(), "{ %var% %var% ; }") )
|
|
{
|
|
erase( tok2, tok2->tokAt(2) );
|
|
erase( tok2->next()->next()->next(), tok2->tokAt(5) );
|
|
done = false;
|
|
}
|
|
|
|
|
|
if ( TOKEN::simpleMatch(tok2->next(), "if") )
|
|
{
|
|
// Delete empty if that is not followed by an else
|
|
if (TOKEN::Match(tok2->next(), "if ; !!else") )
|
|
{
|
|
erase(tok2, tok2->tokAt(2));
|
|
done = false;
|
|
}
|
|
|
|
// Delete "if ; else ;"
|
|
else if ( TOKEN::Match(tok2->next(), "if ; else ;") )
|
|
{
|
|
erase( tok2, tok2->tokAt(4) );
|
|
done = false;
|
|
}
|
|
|
|
// TODO Make this more generic. Delete "if ; else use ; use"
|
|
else if ( TOKEN::Match(tok2, "; if ; else assign|use ; assign|use") ||
|
|
TOKEN::Match(tok2, "; if assign|use ; else ; assign|use") )
|
|
{
|
|
erase( tok2, tok2->tokAt(4) );
|
|
done = false;
|
|
}
|
|
|
|
|
|
// Reduce "if assign|dealloc|use ;" that is not followed by an else..
|
|
// If "--all" has been given these are deleted
|
|
// Otherwise, only the "if" will be deleted
|
|
else if (TOKEN::Match(tok2, "[;{}] if assign|dealloc|use ; !!else") )
|
|
{
|
|
if ( _settings._showAll )
|
|
erase(tok2, tok2->tokAt(3));
|
|
else
|
|
erase( tok2, tok2->tokAt(2) );
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "if if" => "if"
|
|
else if ( TOKEN::Match(tok2, "if if") )
|
|
{
|
|
erase(tok2, tok2->tokAt(2));
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "if return ; alloc ;" => "alloc ;"
|
|
else if (TOKEN::Match(tok2, "[;{}] if return ; alloc ;"))
|
|
{
|
|
erase(tok2, tok2->tokAt(4));
|
|
done = false;
|
|
}
|
|
|
|
// "[;{}] if alloc ; else return ;" => "[;{}] alloc ;"
|
|
else if (TOKEN::Match(tok2,"[;{}] if alloc ; else return ;"))
|
|
{
|
|
erase(tok2, tok2->tokAt(2)); // Remove "if"
|
|
erase(tok2->next(), tok2->tokAt(5)); // Remove "; else return"
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "if ; else %var% ;" => "if %var% ;"
|
|
else if ( TOKEN::Match(tok2->next(), "if ; else %var% ;") )
|
|
{
|
|
erase( tok2->next(), tok2->tokAt(4) );
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "if ; else return use ;" => "if return use ;"
|
|
else if ( TOKEN::Match(tok2->next(), "if ; else return use ;") )
|
|
{
|
|
erase( tok2->next(), tok2->tokAt(4) );
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "if return ; if return ;" => "if return ;"
|
|
else if ( TOKEN::Match(tok2->next(), "if return ; if return ;") )
|
|
{
|
|
erase( tok2, tok2->tokAt(4) );
|
|
done = false;
|
|
}
|
|
|
|
// Delete first if in .. "if { dealloc|assign|use ; return ; } if return ;"
|
|
else if ( TOKEN::Match(tok2, "[;{}] if { dealloc|assign|use ; return ; } if return ;") )
|
|
{
|
|
erase(tok2, tok2->tokAt(8));
|
|
done = false;
|
|
}
|
|
|
|
// Reducing if..
|
|
else if ( _settings._showAll )
|
|
{
|
|
if (TOKEN::Match(tok2->next(), "if assign|dealloc|use ; else"))
|
|
{
|
|
erase(tok2->next(), tok2->tokAt(3));
|
|
done = false;
|
|
}
|
|
if (TOKEN::Match(tok2,"[;{}] if { assign|dealloc|use ; return ; } !!else") )
|
|
{
|
|
erase(tok2,tok2->tokAt(8));
|
|
done = false;
|
|
}
|
|
}
|
|
|
|
continue;
|
|
}
|
|
|
|
// Reduce "if(var) dealloc ;" and "if(var) use ;" that is not followed by an else..
|
|
if (TOKEN::Match(tok2, "[;{}] if(var) assign|dealloc|use ; !!else") )
|
|
{
|
|
erase(tok2, tok2->tokAt(2));
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "; if(!var) alloc ; !!else" => "; dealloc ; alloc ;"
|
|
if ( TOKEN::Match(tok2, "; if(!var) alloc ; !!else") )
|
|
{
|
|
// Remove the "if(!var)"
|
|
erase( tok2, tok2->tokAt(2) );
|
|
|
|
// Insert "dealloc ;" before the "alloc ;"
|
|
tok2->insertToken( ";" );
|
|
tok2->insertToken( "dealloc" );
|
|
|
|
done = false;
|
|
}
|
|
|
|
|
|
// Reduce "if* ;" that is not followed by an else..
|
|
if (TOKEN::Match(tok2->next(), "if(var)|if(!var)|if(true)|if(false)|ifv ; !!else") )
|
|
{
|
|
erase(tok2, tok2->tokAt(2));
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "else ;" => ";"
|
|
if ( TOKEN::Match(tok2->next(), "else ;") )
|
|
{
|
|
erase(tok2, tok2->tokAt(2));
|
|
done = false;
|
|
}
|
|
|
|
// Delete if block: "alloc; if return use ;"
|
|
if (TOKEN::Match(tok2,"alloc ; if return use ; !!else") )
|
|
{
|
|
erase(tok2, tok2->tokAt(5));
|
|
done = false;
|
|
}
|
|
|
|
|
|
// Replace "dealloc use ;" with "dealloc ;"
|
|
if ( TOKEN::Match(tok2, "dealloc use ;") )
|
|
{
|
|
erase(tok2, tok2->tokAt(2));
|
|
done = false;
|
|
}
|
|
|
|
// Remove the "if break|continue ;" that follows "dealloc ; alloc ;"
|
|
if ( ! _settings._showAll && TOKEN::Match(tok2, "dealloc ; alloc ; if break|continue ;") )
|
|
{
|
|
tok2 = tok2->next()->next()->next();
|
|
erase(tok2, tok2->tokAt(3));
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "do { alloc ; } " => "alloc ;"
|
|
// TODO: If the loop can be executed twice reduce to "loop alloc ;" instead
|
|
if ( TOKEN::Match(tok2->next(), "do { alloc ; }") )
|
|
{
|
|
erase(tok2, tok2->tokAt(3));
|
|
erase(tok2->next()->next(), tok2->tokAt(4));
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "loop if break ; => ";"
|
|
if ( TOKEN::Match( tok2->next(), "loop if break|continue ; !!else") )
|
|
{
|
|
erase( tok2, tok2->tokAt(4) );
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "loop { assign|dealloc|use ; alloc ; if break ; }" to "assign|dealloc|use ; alloc ;"
|
|
if ( TOKEN::Match( tok2->next(), "loop { assign|dealloc|use ; alloc ; if break|continue ; }" ) )
|
|
{
|
|
// erase "loop {"
|
|
erase( tok2, tok2->tokAt(3) );
|
|
// erase "if break|continue ; }"
|
|
tok2 = tok2->next()->next()->next()->next();
|
|
erase( tok2, tok2->tokAt(5) );
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "if(true) X ;" => "X ;"
|
|
if (TOKEN::Match(tok2->next(), "if(true) %var% ; !!else") )
|
|
{
|
|
erase( tok2, tok2->tokAt(2) );
|
|
done = false;
|
|
}
|
|
|
|
// Replace "loop { X ; break ; }" with "X ;"
|
|
if ( TOKEN::Match(tok2->next(), "loop { %var% ; break ; }") )
|
|
{
|
|
erase(tok2, tok2->tokAt(3));
|
|
erase(tok2->next()->next(), tok2->tokAt(6));
|
|
done = false;
|
|
}
|
|
|
|
// Replace "loop ;" with ";"
|
|
if ( TOKEN::Match(tok2->next(), "loop ;") )
|
|
{
|
|
erase(tok2, tok2->tokAt(2));
|
|
done = false;
|
|
}
|
|
|
|
// Replace "loop !var ;" with ";"
|
|
if ( TOKEN::Match(tok2->next(), "loop !var ;") )
|
|
{
|
|
erase(tok2, tok2->tokAt(4));
|
|
done = false;
|
|
}
|
|
|
|
// Replace "loop !var alloc ;" with " alloc ;"
|
|
if ( TOKEN::Match(tok2->next(), "loop !var alloc ;") )
|
|
{
|
|
erase(tok2, tok2->tokAt(3));
|
|
done = false;
|
|
}
|
|
|
|
// Delete if block in "alloc ; if(!var) return ;"
|
|
if ( TOKEN::Match(tok2, "alloc ; if(!var) return ;") )
|
|
{
|
|
erase(tok2, tok2->tokAt(4));
|
|
done = false;
|
|
}
|
|
|
|
// Delete if block: "alloc; if return use ;"
|
|
if (TOKEN::Match(tok2,"alloc ; if return use ; !!else") )
|
|
{
|
|
erase(tok2, tok2->tokAt(5));
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "[;{}] return ; %var%" => "[;{}] return ;"
|
|
if ( TOKEN::Match(tok2, "[;{}] return ; %var%") )
|
|
{
|
|
erase( tok2->next()->next(), tok2->tokAt(4) );
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "[;{}] return use ; %var%" => "[;{}] return use ;"
|
|
if ( TOKEN::Match(tok2, "[;{}] return use ; %var%") )
|
|
{
|
|
erase( tok2->next()->next()->next(), tok2->tokAt(5) );
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "if(var) return use ;" => "return use ;"
|
|
if ( TOKEN::Match(tok2->next(), "if(var) return use ; !!else") )
|
|
{
|
|
erase( tok2, tok2->tokAt(2) );
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "if(var) assign|dealloc|use ;" => "assign|dealloc|use ;"
|
|
if ( TOKEN::Match(tok2->next(), "if(var) assign|dealloc|use ; !!else") )
|
|
{
|
|
erase( tok2, tok2->tokAt(2) );
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "[;{}] alloc ; dealloc ;" => "[;{}]"
|
|
if ( TOKEN::Match(tok2, "[;{}] alloc ; dealloc ;") )
|
|
{
|
|
erase( tok2, tok2->tokAt(5) );
|
|
done = false;
|
|
}
|
|
|
|
// Reduce "if* alloc ; dealloc ;" => ";"
|
|
if ( TOKEN::Match(tok2->tokAt(2), "alloc ; dealloc ;") &&
|
|
tok2->next()->str().find("if") == 0 )
|
|
{
|
|
erase( tok2, tok2->tokAt(5) );
|
|
done = false;
|
|
}
|
|
|
|
// Delete second use in "use ; use ;"
|
|
while (TOKEN::Match(tok2, "[;{}] use ; use ;"))
|
|
{
|
|
erase(tok2, tok2->tokAt(3));
|
|
done = false;
|
|
}
|
|
|
|
// Delete first part in "use ; dealloc ;"
|
|
if (TOKEN::Match(tok2, "[;{}] use ; dealloc ;"))
|
|
{
|
|
erase(tok2, tok2->tokAt(3));
|
|
done = false;
|
|
}
|
|
|
|
// Delete first part in "use ; return use ;"
|
|
if (TOKEN::Match(tok2, "[;{}] use ; return use ;"))
|
|
{
|
|
erase(tok2, tok2->tokAt(2));
|
|
done = false;
|
|
}
|
|
|
|
// Delete second case in "case ; case ;"
|
|
while (TOKEN::Match(tok2, "case ; case ;"))
|
|
{
|
|
erase(tok2, tok2->tokAt(3));
|
|
done = false;
|
|
}
|
|
|
|
// Replace switch with if (if not complicated)
|
|
if (TOKEN::Match(tok2, "switch {"))
|
|
{
|
|
// Right now, I just handle if there are a few case and perhaps a default.
|
|
bool valid = false;
|
|
bool incase = false;
|
|
for ( const TOKEN * _tok = tok2->tokAt(2); _tok; _tok = _tok->next() )
|
|
{
|
|
if ( _tok->str() == "{" )
|
|
break;
|
|
|
|
else if ( _tok->str() == "}" )
|
|
{
|
|
valid = true;
|
|
break;
|
|
}
|
|
|
|
else if (strncmp(_tok->aaaa(),"if",2)==0)
|
|
break;
|
|
|
|
else if (_tok->str() == "switch")
|
|
break;
|
|
|
|
else if (_tok->str() == "loop")
|
|
break;
|
|
|
|
else if (incase && TOKEN::Match(_tok,"case"))
|
|
break;
|
|
|
|
incase |= TOKEN::Match(_tok,"case");
|
|
incase &= !TOKEN::Match(_tok,"break");
|
|
}
|
|
|
|
if ( !incase && valid )
|
|
{
|
|
done = false;
|
|
tok2->setstr(";");
|
|
erase( tok2, tok2->tokAt(2) );
|
|
tok2 = tok2->next();
|
|
bool first = true;
|
|
while (TOKEN::Match(tok2,"case") || TOKEN::Match(tok2,"default"))
|
|
{
|
|
bool def = TOKEN::Match(tok2, "default");
|
|
tok2->setstr(first ? "if" : "}");
|
|
if ( first )
|
|
{
|
|
first = false;
|
|
instoken( tok2, "{" );
|
|
}
|
|
else
|
|
{
|
|
// Insert "else [if] {
|
|
instoken( tok2, "{" );
|
|
if ( ! def )
|
|
instoken( tok2, "if" );
|
|
instoken( tok2, "else" );
|
|
}
|
|
while ( tok2 && tok2->str() != "}" && ! TOKEN::Match(tok2,"break ;") )
|
|
tok2 = tok2->next();
|
|
if (TOKEN::Match(tok2,"break ;"))
|
|
{
|
|
tok2->setstr(";");
|
|
tok2 = tok2->next()->next();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if ( TOKEN::Match(tok2, "throw") )
|
|
{
|
|
tok2->setstr( "return" );
|
|
done = false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
// Check for memory leaks for a function variable.
|
|
void CheckMemoryLeakClass::CheckMemoryLeak_CheckScope( const TOKEN *Tok1, const char varname[] )
|
|
{
|
|
std::list<const TOKEN *> callstack;
|
|
|
|
AllocType alloctype = No;
|
|
AllocType dealloctype = No;
|
|
|
|
TOKEN *tok = getcode( Tok1, callstack, varname, alloctype, dealloctype );
|
|
//tok->printOut( "getcode result" );
|
|
|
|
simplifycode( tok );
|
|
//tok->printOut( "simplifycode result" );
|
|
|
|
// If the variable is not allocated at all => no memory leak
|
|
if (TOKEN::findmatch(tok, "alloc") == 0)
|
|
{
|
|
Tokenizer::deleteTokens(tok);
|
|
return;
|
|
}
|
|
|
|
// TODO : handle "goto"
|
|
if (TOKEN::findmatch(tok, "goto"))
|
|
{
|
|
Tokenizer::deleteTokens(tok);
|
|
return;
|
|
}
|
|
|
|
const TOKEN *result;
|
|
if ( (result = TOKEN::findmatch(tok, "loop alloc ;")) != NULL )
|
|
{
|
|
MemoryLeak(result, varname, alloctype);
|
|
}
|
|
|
|
else if ( (result = TOKEN::findmatch(tok, "alloc ; if break|continue|return ;")) != NULL )
|
|
{
|
|
MemoryLeak(result->tokAt(3), varname, alloctype);
|
|
}
|
|
|
|
else if ( _settings._showAll && (result = TOKEN::findmatch(tok, "alloc ; ifv break|continue|return ;")) != NULL )
|
|
{
|
|
MemoryLeak(result->tokAt(3), varname, alloctype);
|
|
}
|
|
|
|
else if ( (result = TOKEN::findmatch(tok, "alloc ; alloc|assign|return ;")) != NULL )
|
|
{
|
|
MemoryLeak(result->tokAt(2), varname, alloctype);
|
|
}
|
|
|
|
else if ( ! TOKEN::findmatch(tok,"dealloc") &&
|
|
! TOKEN::findmatch(tok,"use") &&
|
|
! TOKEN::findmatch(tok,"return use ;") )
|
|
{
|
|
const TOKEN *last = tok;
|
|
while (last->next())
|
|
last = last->next();
|
|
MemoryLeak(last, varname, alloctype);
|
|
}
|
|
|
|
// detect cases that "simplifycode" don't handle well..
|
|
else if ( _settings._debug )
|
|
{
|
|
TOKEN *first = tok;
|
|
while ( first && first->str() == ";" )
|
|
first = first->next();
|
|
|
|
bool noerr = false;
|
|
noerr |= TOKEN::Match( first, "alloc ; }" );
|
|
noerr |= TOKEN::Match( first, "alloc ; dealloc ; }" );
|
|
noerr |= TOKEN::Match( first, "alloc ; return use ; }" );
|
|
noerr |= TOKEN::Match( first, "alloc ; use ; }" );
|
|
noerr |= TOKEN::Match( first, "alloc ; use ; return ; }" );
|
|
noerr |= TOKEN::Match( first, "if alloc ; dealloc ; }" );
|
|
noerr |= TOKEN::Match( first, "if alloc ; return use ; }" );
|
|
noerr |= TOKEN::Match( first, "if alloc ; use ; }" );
|
|
noerr |= TOKEN::Match( first, "alloc ; ifv return ; dealloc ; }" );
|
|
noerr |= TOKEN::Match( first, "alloc ; if return ; dealloc; }" );
|
|
|
|
// Unhandled case..
|
|
if ( ! noerr )
|
|
{
|
|
std::cout << "Token listing..\n ";
|
|
for ( const TOKEN *tok2 = tok; tok2; tok2 = tok2->next() )
|
|
std::cout << " " << tok2->str();
|
|
std::cout << "\n";
|
|
}
|
|
}
|
|
|
|
Tokenizer::deleteTokens(tok);
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Checks for memory leaks inside function..
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckMemoryLeakClass::CheckMemoryLeak_InFunction()
|
|
{
|
|
bool infunc = false;
|
|
int indentlevel = 0;
|
|
for (const TOKEN *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (tok->str() == "{")
|
|
indentlevel++;
|
|
|
|
else if (tok->str() == "}")
|
|
indentlevel--;
|
|
|
|
|
|
// In function..
|
|
if ( indentlevel == 0 )
|
|
{
|
|
if ( TOKEN::Match(tok, ") {") )
|
|
infunc = true;
|
|
|
|
else if ( TOKEN::Match(tok, "[;}]") )
|
|
infunc = false;
|
|
}
|
|
|
|
// Declare a local variable => Check
|
|
if (indentlevel>0 && infunc)
|
|
{
|
|
if ( TOKEN::Match(tok, "[{};] %type% * %var% [;=]") )
|
|
CheckMemoryLeak_CheckScope( tok->next(), tok->strAt(3) );
|
|
|
|
else if ( TOKEN::Match(tok, "[{};] %type% %type% * %var% [;=]") )
|
|
CheckMemoryLeak_CheckScope( tok->next(), tok->strAt(4) );
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Checks for memory leaks in classes..
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
void CheckMemoryLeakClass::CheckMemoryLeak_ClassMembers()
|
|
{
|
|
int indentlevel = 0;
|
|
for ( const TOKEN *tok = _tokenizer->tokens(); tok; tok = tok->next() )
|
|
{
|
|
if ( tok->str() == "{" )
|
|
indentlevel++;
|
|
|
|
else if ( tok->str() == "}" )
|
|
indentlevel--;
|
|
|
|
else if ( indentlevel == 0 && TOKEN::Match(tok, "class %var% [{:]") )
|
|
{
|
|
std::vector<const char *> classname;
|
|
classname.push_back( tok->strAt(1) );
|
|
CheckMemoryLeak_ClassMembers_ParseClass( tok, classname );
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void CheckMemoryLeakClass::CheckMemoryLeak_ClassMembers_ParseClass( const TOKEN *tok1, std::vector<const char *> &classname )
|
|
{
|
|
// Go into class.
|
|
while ( tok1 && tok1->str() != "{" )
|
|
tok1 = tok1->next();
|
|
if ( tok1 )
|
|
tok1 = tok1->next();
|
|
|
|
int indentlevel = 0;
|
|
for ( const TOKEN *tok = tok1; tok; tok = tok->next() )
|
|
{
|
|
if ( tok->str() == "{" )
|
|
indentlevel++;
|
|
|
|
else if ( tok->str() == "}" )
|
|
{
|
|
indentlevel--;
|
|
if ( indentlevel < 0 )
|
|
return;
|
|
}
|
|
|
|
// Only parse this particular class.. not subclasses
|
|
if ( indentlevel > 0 )
|
|
continue;
|
|
|
|
// Declaring subclass.. recursive checking
|
|
if ( TOKEN::Match(tok, "class %var% [{:]") )
|
|
{
|
|
classname.push_back( tok->strAt(1) );
|
|
CheckMemoryLeak_ClassMembers_ParseClass( tok, classname );
|
|
classname.pop_back();
|
|
}
|
|
|
|
// Declaring member variable.. check allocations and deallocations
|
|
if ( TOKEN::Match(tok->next(), "%type% * %var% ;") )
|
|
{
|
|
if ( tok->isName() || TOKEN::Match(tok, "[;}]"))
|
|
{
|
|
if (_settings._showAll || !isclass(tok->tokAt(1)))
|
|
CheckMemoryLeak_ClassMembers_Variable( classname, tok->strAt(3) );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckMemoryLeakClass::CheckMemoryLeak_ClassMembers_Variable( const std::vector<const char *> &classname, const char varname[] )
|
|
{
|
|
// Function pattern.. Check if member function
|
|
std::ostringstream fpattern;
|
|
for ( unsigned int i = 0; i < classname.size(); i++ )
|
|
{
|
|
fpattern << classname[i] << " :: ";
|
|
}
|
|
fpattern << "%var% (";
|
|
|
|
// Destructor pattern.. Check if class destructor..
|
|
std::ostringstream destructor;
|
|
for ( unsigned int i = 0; i < classname.size(); i++ )
|
|
{
|
|
destructor << classname[i] << " :: ";
|
|
}
|
|
destructor << " ~ " << classname.back() << " (";
|
|
|
|
// Pattern used in member function. "Var = ..."
|
|
std::ostringstream varname_eq;
|
|
varname_eq << varname << " =";
|
|
|
|
// Full variable name..
|
|
std::ostringstream FullVariableName;
|
|
for ( unsigned int i = 0; i < classname.size(); i++ )
|
|
FullVariableName << classname[i] << "::";
|
|
FullVariableName << varname;
|
|
|
|
// Check if member variable has been allocated and deallocated..
|
|
AllocType Alloc = No;
|
|
AllocType Dealloc = No;
|
|
|
|
// Loop through all tokens. Inspect member functions
|
|
bool memberfunction = false;
|
|
int indentlevel = 0;
|
|
for ( const TOKEN *tok = _tokenizer->tokens(); tok; tok = tok->next() )
|
|
{
|
|
if ( tok->str() == "{" )
|
|
indentlevel++;
|
|
|
|
else if ( tok->str() == "}" )
|
|
indentlevel--;
|
|
|
|
// Set the 'memberfunction' variable..
|
|
if ( indentlevel == 0 )
|
|
{
|
|
if ( TOKEN::Match(tok, "[;}]") )
|
|
memberfunction = false;
|
|
else if ( TOKEN::Match( tok, fpattern.str().c_str() ) || TOKEN::Match( tok, destructor.str().c_str() ) )
|
|
memberfunction = true;
|
|
}
|
|
|
|
// Parse member function..
|
|
if ( indentlevel > 0 && memberfunction )
|
|
{
|
|
// Allocate..
|
|
if ( TOKEN::Match( tok, varname_eq.str().c_str() ) )
|
|
{
|
|
AllocType alloc = GetAllocationType( tok->tokAt(2) );
|
|
if ( alloc != No )
|
|
{
|
|
std::list<const TOKEN *> callstack;
|
|
if ( Dealloc != No && Dealloc != alloc )
|
|
MismatchError( tok, callstack, FullVariableName.str().c_str() );
|
|
if ( Alloc != No && Alloc != alloc )
|
|
MismatchError( tok, callstack, FullVariableName.str().c_str() );
|
|
Alloc = alloc;
|
|
}
|
|
}
|
|
|
|
// Deallocate..
|
|
const char *varnames[2] = { "var", 0 };
|
|
varnames[0] = varname;
|
|
AllocType dealloc = GetDeallocationType( tok, varnames );
|
|
if ( dealloc != No )
|
|
{
|
|
std::list<const TOKEN *> callstack;
|
|
if ( Dealloc != No && Dealloc != dealloc )
|
|
MismatchError( tok, callstack, FullVariableName.str().c_str() );
|
|
if ( Alloc != No && Alloc != dealloc )
|
|
MismatchError( tok, callstack, FullVariableName.str().c_str() );
|
|
Dealloc = dealloc;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ( Alloc != No && Dealloc == No )
|
|
{
|
|
MemoryLeak( _tokenizer->tokens(), FullVariableName.str().c_str(), Alloc );
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Checks for memory leaks..
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckMemoryLeakClass::CheckMemoryLeak()
|
|
{
|
|
_listAllocFunc.clear();
|
|
|
|
// Check for memory leaks inside functions..
|
|
CheckMemoryLeak_InFunction();
|
|
|
|
// Check that all class members are deallocated..
|
|
if ( _settings._showAll )
|
|
CheckMemoryLeak_ClassMembers();
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Non-recursive function analysis
|
|
//---------------------------------------------------------------------------
|
|
|
|
TOKEN * CheckMemoryLeakClass::functionParameterCode(const TOKEN *ftok, int parameter)
|
|
{
|
|
int param = 1; // First parameter has index 1
|
|
|
|
// Extract the code for specified parameter...
|
|
for ( ; ftok; ftok = ftok->next() )
|
|
{
|
|
if ( ftok->str() == ")" )
|
|
break;
|
|
|
|
if ( ftok->str() == "," )
|
|
{
|
|
++param;
|
|
if ( param > parameter )
|
|
break;
|
|
}
|
|
|
|
if ( param != parameter )
|
|
continue;
|
|
|
|
if ( ! TOKEN::Match(ftok, "* %var% [,)]") )
|
|
continue;
|
|
|
|
// Extract and return the code for this parameter..
|
|
const char *parname = ftok->strAt(1);
|
|
|
|
// Goto function implementation..
|
|
while ( ftok && ftok->str() != "{" )
|
|
ftok = ftok->next();
|
|
ftok = ftok ? ftok->next() : NULL;
|
|
|
|
// Return the code..
|
|
AllocType alloc=No, dealloc=No;
|
|
std::list<const TOKEN *> callstack;
|
|
TOKEN *code = getcode( ftok, callstack, parname, alloc, dealloc );
|
|
simplifycode( code );
|
|
return code;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|