/
checkmemoryleak.cpp
3097 lines (2634 loc) · 103 KB
/
checkmemoryleak.cpp
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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2010 Daniel Marjamäki and Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "checkmemoryleak.h"
#include "mathlib.h"
#include "tokenize.h"
#include "executionpath.h"
#include <algorithm>
#include <cstring>
#include <cstdlib>
#include <iostream>
#include <sstream>
#include <set>
#include <stack>
//---------------------------------------------------------------------------
// Register this check class (by creating a static instance of it)
namespace
{
CheckMemoryLeakInFunction instance1;
CheckMemoryLeakInClass instance2;
CheckMemoryLeakStructMember instance3;
CheckMemoryLeakNoVar instance4;
}
// This list needs to be alphabetically sorted so we can run bsearch on it
static const char * const call_func_white_list[] =
{
"asctime", "asctime_r", "asprintf", "assert", "atof", "atoi", "atol", "clearerr"
, "ctime", "ctime_r", "delete", "fchmod", "fclose", "fcntl"
, "fdatasync", "feof", "ferror", "fflush", "fgetc", "fgetpos", "fgets"
, "flock", "for", "fprintf", "fputc", "fputs", "fread", "free", "fscanf", "fseek"
, "fseeko", "fsetpos", "fstat", "fsync", "ftell", "ftello", "ftruncate"
, "fwrite", "getc", "gets", "gmtime", "gmtime_r", "if", "ioctl"
, "localtime", "localtime_r"
, "lockf", "lseek", "memchr", "memcmp", "memcpy", "memmove", "memset"
, "posix_fadvise", "posix_fallocate", "pread"
, "printf", "puts", "pwrite", "qsort", "read", "readahead", "readdir", "readdir_r", "readv"
, "realloc", "return", "rewind", "rewinddir", "scandir", "scanf", "seekdir"
, "setbuf", "setbuffer", "setlinebuf", "setvbuf", "snprintf", "sprintf", "sscanf", "strcasecmp"
, "strcat", "strchr", "strcmp", "strcpy", "stricmp", "strlen", "strncat", "strncmp"
, "strncpy", "strrchr", "strstr", "strtod", "strtol", "strtoul", "switch"
, "sync_file_range", "telldir", "time", "typeid", "vfprintf", "vprintf"
, "vsnprintf", "vsprintf", "while", "write", "writev"
};
static int call_func_white_list_compare(const void *a, const void *b)
{
return strcmp((const char *)a, *(const char **)b);
}
//---------------------------------------------------------------------------
bool CheckMemoryLeak::isclass(const Tokenizer *_tokenizer, const Token *tok) const
{
if (tok->isStandardType())
return false;
std::ostringstream pattern;
pattern << "struct " << tok->str();
if (Token::findmatch(_tokenizer->tokens(), pattern.str().c_str()))
return false;
return true;
}
//---------------------------------------------------------------------------
CheckMemoryLeak::AllocType CheckMemoryLeak::getAllocationType(const Token *tok2, unsigned int varid) const
{
// What we may have...
// * var = (char *)malloc(10);
// * var = new char[10];
// * var = strdup("hello");
// * var = strndup("hello", 3);
if (tok2 && tok2->str() == "(")
{
tok2 = tok2->link();
tok2 = tok2 ? tok2->next() : NULL;
}
if (! tok2)
return No;
if (! tok2->isName())
return No;
// Does tok2 point on "malloc", "strdup" or "kmalloc"..
static const char * const mallocfunc[] = {"malloc",
"calloc",
"strdup",
"strndup",
"kmalloc",
"kzalloc",
"kcalloc",
0
};
for (unsigned int i = 0; mallocfunc[i]; i++)
{
if (tok2->str() == mallocfunc[i])
return Malloc;
}
// Using realloc..
if (varid && Token::Match(tok2, "realloc ( %any% ,") && tok2->tokAt(2)->varId() != varid)
return Malloc;
// Does tok2 point on "g_malloc", "g_strdup", ..
static const char * const gmallocfunc[] = {"g_new",
"g_new0",
"g_try_new",
"g_try_new0",
"g_malloc",
"g_malloc0",
"g_try_malloc",
"g_try_malloc0",
"g_strdup",
"g_strndup",
"g_strdup_printf",
0
};
for (unsigned int i = 0; gmallocfunc[i]; i++)
{
if (tok2->str() == gmallocfunc[i])
return gMalloc;
}
if (Token::Match(tok2, "new %type% [;()]") ||
Token::Match(tok2, "new ( std :: nothrow ) %type% [;()]") ||
Token::Match(tok2, "new ( nothrow ) %type% [;()]"))
return New;
if (Token::Match(tok2, "new %type% [") ||
Token::Match(tok2, "new ( std :: nothrow ) %type% [") ||
Token::Match(tok2, "new ( nothrow ) %type% ["))
return NewArray;
if (Token::Match(tok2, "fopen|tmpfile|g_fopen ("))
return File;
if (Token::Match(tok2, "open|openat|creat|mkstemp|mkostemp ("))
{
// is there a user function with this name?
if (tokenizer && Token::findmatch(tokenizer->tokens(), ("%type% *|&| " + tok2->str()).c_str()))
return No;
return Fd;
}
if (Token::simpleMatch(tok2, "popen ("))
return Pipe;
if (Token::Match(tok2, "opendir|fdopendir ("))
return Dir;
return No;
}
CheckMemoryLeak::AllocType CheckMemoryLeak::getReallocationType(const Token *tok2, unsigned int varid) const
{
// What we may have...
// * var = (char *)realloc(..;
if (tok2 && tok2->str() == "(")
{
tok2 = tok2->link();
tok2 = tok2 ? tok2->next() : NULL;
}
if (! tok2)
return No;
if (varid > 0 && ! Token::Match(tok2, "%var% ( %varid% [,)]", varid))
return No;
if (tok2->str() == "realloc")
return Malloc;
// GTK memory reallocation..
if (Token::Match(tok2, "g_realloc|g_try_realloc|g_renew|g_try_renew"))
return gMalloc;
return No;
}
CheckMemoryLeak::AllocType CheckMemoryLeak::getDeallocationType(const Token *tok, unsigned int varid) const
{
if (Token::Match(tok, "delete %varid% ;", varid))
return New;
if (Token::Match(tok, "delete [ ] %varid% ;", varid))
return NewArray;
if (Token::Match(tok, "delete ( %varid% ) ;", varid))
return New;
if (Token::Match(tok, "delete [ ] ( %varid% ) ;", varid))
return NewArray;
if (Token::Match(tok, "free|kfree ( %varid% ) ;", varid) ||
Token::Match(tok, "free|kfree ( %varid% -", varid))
return Malloc;
if (Token::Match(tok, "g_free ( %varid% ) ;", varid) ||
Token::Match(tok, "g_free ( %varid% -", varid))
return gMalloc;
if (Token::Match(tok, "fclose ( %varid% )", varid) ||
Token::Match(tok, "fcloseall ( )"))
return File;
if (Token::Match(tok, "close ( %varid% )", varid))
return Fd;
if (Token::Match(tok, "pclose ( %varid% )", varid))
return Pipe;
if (Token::Match(tok, "closedir ( %varid% )", varid))
return Dir;
return No;
}
CheckMemoryLeak::AllocType CheckMemoryLeak::getDeallocationType(const Token *tok, const std::string &varname) const
{
if (Token::simpleMatch(tok, std::string("delete " + varname + " ;").c_str()))
return New;
if (Token::simpleMatch(tok, std::string("delete [ ] " + varname + " ;").c_str()))
return NewArray;
if (Token::simpleMatch(tok, std::string("delete ( " + varname + " ) ;").c_str()))
return New;
if (Token::simpleMatch(tok, std::string("delete [ ] ( " + varname + " ) ;").c_str()))
return NewArray;
if (Token::simpleMatch(tok, std::string("free ( " + varname + " ) ;").c_str()) ||
Token::simpleMatch(tok, std::string("kfree ( " + varname + " ) ;").c_str()))
return Malloc;
if (Token::simpleMatch(tok, std::string("g_free ( " + varname + " ) ;").c_str()))
return gMalloc;
if (Token::simpleMatch(tok, std::string("fclose ( " + varname + " )").c_str()) ||
Token::simpleMatch(tok, "fcloseall ( )"))
return File;
if (Token::simpleMatch(tok, std::string("close ( " + varname + " )").c_str()))
return Fd;
if (Token::simpleMatch(tok, std::string("pclose ( " + varname + " )").c_str()))
return Pipe;
if (Token::simpleMatch(tok, std::string("closedir ( " + varname + " )").c_str()))
return Dir;
return No;
}
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
void CheckMemoryLeak::memoryLeak(const Token *tok, const std::string &varname, AllocType alloctype)
{
if (alloctype == CheckMemoryLeak::File ||
alloctype == CheckMemoryLeak::Pipe ||
alloctype == CheckMemoryLeak::Fd ||
alloctype == CheckMemoryLeak::Dir)
resourceLeakError(tok, varname.c_str());
else
memleakError(tok, varname.c_str());
}
//---------------------------------------------------------------------------
void CheckMemoryLeak::reportErr(const Token *tok, Severity::SeverityType severity, const std::string &id, const std::string &msg) const
{
std::list<const Token *> callstack;
if (tok)
callstack.push_back(tok);
reportErr(callstack, severity, id, msg);
}
void CheckMemoryLeak::reportErr(const std::list<const Token *> &callstack, Severity::SeverityType severity, const std::string &id, const std::string &msg) const
{
std::list<ErrorLogger::ErrorMessage::FileLocation> locations;
for (std::list<const Token *>::const_iterator it = callstack.begin(); it != callstack.end(); ++it)
{
const Token * const tok = *it;
ErrorLogger::ErrorMessage::FileLocation loc;
loc.line = tok->linenr();
loc.setfile(tokenizer->file(tok));
locations.push_back(loc);
}
const ErrorLogger::ErrorMessage errmsg(locations, severity, msg, id);
if (errorLogger)
errorLogger->reportErr(errmsg);
else
Check::reportError(errmsg);
}
void CheckMemoryLeak::memleakError(const Token *tok, const std::string &varname)
{
reportErr(tok, Severity::error, "memleak", "Memory leak: " + varname);
}
void CheckMemoryLeak::memleakUponReallocFailureError(const Token *tok, const std::string &varname)
{
reportErr(tok, Severity::error, "memleakOnRealloc", "Common realloc mistake: \"" + varname + "\" nulled but not freed upon failure");
}
void CheckMemoryLeak::resourceLeakError(const Token *tok, const std::string &varname)
{
std::string errmsg("Resource leak");
if (!varname.empty())
errmsg += ": " + varname;
reportErr(tok, Severity::error, "resourceLeak", errmsg);
}
void CheckMemoryLeak::deallocDeallocError(const Token *tok, const std::string &varname)
{
reportErr(tok, Severity::error, "deallocDealloc", "Deallocating a deallocated pointer: " + varname);
}
void CheckMemoryLeak::deallocuseError(const Token *tok, const std::string &varname)
{
reportErr(tok, Severity::error, "deallocuse", "Dereferencing '" + varname + "' after it is deallocated / released");
}
void CheckMemoryLeak::mismatchSizeError(const Token *tok, const std::string &sz)
{
reportErr(tok, Severity::error, "mismatchSize", "The given size " + sz + " is mismatching");
}
void CheckMemoryLeak::mismatchAllocDealloc(const std::list<const Token *> &callstack, const std::string &varname)
{
reportErr(callstack, Severity::error, "mismatchAllocDealloc", "Mismatching allocation and deallocation: " + varname);
}
CheckMemoryLeak::AllocType CheckMemoryLeak::functionReturnType(const Token *tok) const
{
// Locate the start of the function..
unsigned int parlevel = 0;
while (tok)
{
if (tok->str() == "{" || tok->str() == "}")
return No;
if (tok->str() == "(")
{
if (parlevel != 0)
return No;
++parlevel;
}
else if (tok->str() == ")")
{
if (parlevel != 1)
return No;
break;
}
tok = tok->next();
}
// Is this the start of a function?
if (!Token::Match(tok, ") const| {"))
return No;
while (tok->str() != "{")
tok = tok->next();
// Get return pointer..
unsigned int varid = 0;
unsigned int indentlevel = 0;
for (const Token *tok2 = tok; tok2; tok2 = tok2->next())
{
if (tok2->str() == "{")
++indentlevel;
else if (tok2->str() == "}")
{
if (indentlevel <= 1)
return No;
--indentlevel;
}
if (Token::Match(tok2, "return %var% ;"))
{
if (indentlevel != 1)
return No;
varid = tok2->next()->varId();
break;
}
else if (tok2->str() == "return")
{
AllocType allocType = getAllocationType(tok2->next(), 0);
if (allocType != No)
return allocType;
allocType = getReallocationType(tok2->next(), 0);
if (allocType != No)
return allocType;
}
}
// Not returning pointer value..
if (varid == 0)
return No;
// Check if return pointer is allocated..
AllocType allocType = No;
while (0 != (tok = tok->next()))
{
if (Token::Match(tok, "%varid% =", varid))
{
allocType = getAllocationType(tok->tokAt(2), varid);
if (allocType == No)
{
allocType = getReallocationType(tok->tokAt(2), varid);
}
if (allocType != No)
return allocType;
}
if (tok->str() == "return")
return allocType;
}
return No;
}
const char *CheckMemoryLeak::functionArgAlloc(const Token *tok, unsigned int targetpar, AllocType &allocType) const
{
// Find the varid of targetpar, then locate the start of the function..
unsigned int parlevel = 0;
unsigned int par = 0;
unsigned int varid = 0;
allocType = No;
while (tok)
{
if (tok->str() == "{" || tok->str() == "}")
return "";
if (tok->str() == "(")
{
if (parlevel != 0)
return "";
++parlevel;
++par;
}
else if (tok->str() == ")")
{
if (parlevel != 1)
return "";
break;
}
else if (parlevel == 1 && tok->str() == ",")
{
++par;
}
tok = tok->next();
if (parlevel == 1 && par == targetpar && Token::Match(tok, "%type% * * %var%"))
{
varid = tok->tokAt(3)->varId();
}
}
if (varid == 0)
return "";
// Is this the start of a function?
if (!Token::Match(tok, ") const| {"))
return "";
while (tok->str() != "{")
tok = tok->next();
// Check if pointer is allocated.
unsigned int indentlevel = 0;
int realloc = 0;
while (0 != (tok = tok->next()))
{
if (tok->str() == "{")
++indentlevel;
else if (tok->str() == "}")
{
if (indentlevel <= 1)
break;
--indentlevel;
}
else if (tok->varId() == varid)
{
if (Token::Match(tok->tokAt(-3), "free ( * %varid% )", varid))
{
realloc = 1;
allocType = No;
}
else if (Token::Match(tok->previous(), "* %varid% =", varid))
{
allocType = getAllocationType(tok->tokAt(2), varid);
if (allocType == No)
{
allocType = getReallocationType(tok->tokAt(2), varid);
}
if (allocType != No)
{
if (realloc)
return "realloc";
return "alloc";
}
}
else
{
// unhandled variable usage: bailout
return "";
}
}
}
return "";
}
void CheckMemoryLeakInFunction::parse_noreturn()
{
noreturn.insert("exit");
noreturn.insert("_exit");
noreturn.insert("_Exit");
noreturn.insert("abort");
noreturn.insert("err");
noreturn.insert("verr");
noreturn.insert("errx");
noreturn.insert("verrx");
std::list<SymbolDatabase::SpaceInfo *>::const_iterator i;
for (i = symbolDatabase->spaceInfoList.begin(); i != symbolDatabase->spaceInfoList.end(); ++i)
{
SymbolDatabase::SpaceInfo *info = *i;
// only check functions
if (info->type != SymbolDatabase::SpaceInfo::Function)
continue;
// parse this function to check if it contains an "exit" call..
unsigned int indentlevel = 1;
for (const Token *tok2 = info->classStart->next(); tok2; tok2 = tok2->next())
{
if (tok2->str() == "{")
++indentlevel;
else if (tok2->str() == "}")
{
--indentlevel;
if (indentlevel == 0)
break;
}
if (Token::Match(tok2, "[;{}] exit ("))
{
noreturn.insert(info->className);
break;
}
}
}
}
bool CheckMemoryLeakInFunction::matchFunctionsThatReturnArg(const Token *tok, unsigned int varid) const
{
return Token::Match(tok, "; %varid% = strcat|memcpy|memmove|strcpy ( %varid% ,", varid);
}
bool CheckMemoryLeakInFunction::notvar(const Token *tok, unsigned int varid, bool endpar) const
{
const std::string end(endpar ? " &&|)" : " [;)&|]");
return bool(Token::Match(tok, ("! %varid%" + end).c_str(), varid) ||
Token::Match(tok, ("! ( %varid% )" + end).c_str(), varid));
}
static int countParameters(const Token *tok)
{
if (!Token::Match(tok, "%var% ("))
return -1;
if (Token::Match(tok->tokAt(2), "void| )"))
return 0;
int numpar = 1;
int parlevel = 0;
for (; tok; tok = tok->next())
{
if (tok->str() == "(")
++parlevel;
else if (tok->str() == ")")
{
if (parlevel <= 1)
return numpar;
--parlevel;
}
else if (parlevel == 1 && tok->str() == ",")
{
++numpar;
}
}
return -1;
}
bool CheckMemoryLeakInFunction::test_white_list(const std::string &funcname)
{
return (std::bsearch(funcname.c_str(), call_func_white_list,
sizeof(call_func_white_list) / sizeof(call_func_white_list[0]),
sizeof(call_func_white_list[0]), call_func_white_list_compare) != NULL);
}
const char * CheckMemoryLeakInFunction::call_func(const Token *tok, std::list<const Token *> callstack, const unsigned int varid, AllocType &alloctype, AllocType &dealloctype, bool &allocpar, unsigned int sz)
{
if (test_white_list(tok->str()))
{
if (tok->str() == "asprintf" ||
tok->str() == "delete" ||
tok->str() == "fclose" ||
tok->str() == "for" ||
tok->str() == "free" ||
tok->str() == "if" ||
tok->str() == "realloc" ||
tok->str() == "return" ||
tok->str() == "switch" ||
tok->str() == "while")
{
return 0;
}
// is the varid a parameter?
for (const Token *tok2 = tok->tokAt(2); tok2; tok2 = tok2->next())
{
if (tok2->str() == "(" || tok2->str() == ")")
break;
if (tok2->varId() == varid)
return "use_";
}
return 0;
}
if (noreturn.find(tok->str()) != noreturn.end())
return "exit";
if (varid > 0 && (getAllocationType(tok, varid) != No || getReallocationType(tok, varid) != No || getDeallocationType(tok, varid) != No))
return 0;
if (callstack.size() > 2)
return "dealloc_";
const std::string funcname(tok->str());
for (std::list<const Token *>::const_iterator it = callstack.begin(); it != callstack.end(); ++it)
{
if ((*it) && (*it)->str() == funcname)
return "recursive";
}
callstack.push_back(tok);
// lock/unlock..
if (varid == 0)
{
const Token *ftok = _tokenizer->getFunctionTokenByName(funcname.c_str());
while (ftok && (ftok->str() != "{"))
ftok = ftok->next();
if (!ftok)
return 0;
Token *func = getcode(ftok->tokAt(1), callstack, 0, alloctype, dealloctype, false, 1);
simplifycode(func);
const char *ret = 0;
if (Token::simpleMatch(func, "; alloc ; }"))
ret = "alloc";
else if (Token::simpleMatch(func, "; dealloc ; }"))
ret = "dealloc";
Tokenizer::deleteTokens(func);
return ret;
}
// Check if this is a function that allocates memory..
if (Token::Match(tok->tokAt(-3), "[;{}] %varid% = %var% (", varid))
{
const Token *ftok = _tokenizer->getFunctionTokenByName(funcname.c_str());
AllocType a = functionReturnType(ftok);
if (a != No)
{
if (alloctype == No)
alloctype = a;
else if (alloctype != a)
alloctype = Many;
return "alloc";
}
}
// how many parameters is there in the function call?
int numpar = countParameters(tok);
if (numpar <= 0)
return "callfunc";
unsigned int par = 1;
unsigned int parlevel = 0;
const bool dot(tok->previous()->str() == ".");
for (; tok; tok = tok->next())
{
if (tok->str() == "(")
++parlevel;
else if (tok->str() == ")")
{
--parlevel;
if (parlevel < 1)
{
return (_settings->inconclusive) ? 0 : "callfunc";
}
}
if (parlevel == 1)
{
if (tok->str() == ",")
++par;
if (varid > 0 && Token::Match(tok, "[,()] %varid% [,()]", varid))
{
if (dot)
return "use";
const Token *ftok = _tokenizer->getFunctionTokenByName(funcname.c_str());
if (!ftok)
return "use";
// how many parameters does the function want?
if (numpar != countParameters(ftok))
return "recursive";
const char *parname = Tokenizer::getParameterName(ftok, par);
if (! parname)
return "recursive";
unsigned int parameterVarid = 0;
{
const Token *partok = Token::findmatch(ftok, parname);
if (partok)
parameterVarid = partok->varId();
}
if (parameterVarid == 0)
return "recursive";
// Check if the function deallocates the variable..
while (ftok && (ftok->str() != "{"))
ftok = ftok->next();
Token *func = getcode(ftok->tokAt(1), callstack, parameterVarid, alloctype, dealloctype, false, sz);
//simplifycode(func, all);
const Token *func_ = func;
while (func_ && func_->str() == ";")
func_ = func_->next();
const char *ret = 0;
/** @todo handle "goto" */
if (Token::findmatch(func_, "dealloc"))
ret = "dealloc";
else if (Token::findmatch(func_, "use"))
ret = "use";
else if (Token::findmatch(func_, "&use"))
ret = "&use";
Tokenizer::deleteTokens(func);
return ret;
}
if (varid > 0 && Token::Match(tok, "[,()] & %varid% [,()]", varid))
{
const Token *ftok = _tokenizer->getFunctionTokenByName(funcname.c_str());
AllocType a;
const char *ret = functionArgAlloc(ftok, par, a);
if (a != No)
{
if (alloctype == No)
alloctype = a;
else if (alloctype != a)
alloctype = Many;
allocpar = true;
return ret;
}
}
}
}
return NULL;
}
static void addtoken(Token **rettail, const Token *tok, const std::string &str)
{
(*rettail)->insertToken(str);
(*rettail) = (*rettail)->next();
(*rettail)->linenr(tok->linenr());
(*rettail)->fileIndex(tok->fileIndex());
}
Token *CheckMemoryLeakInFunction::getcode(const Token *tok, std::list<const Token *> callstack, const unsigned int varid, CheckMemoryLeak::AllocType &alloctype, CheckMemoryLeak::AllocType &dealloctype, bool classmember, unsigned int sz)
{
Token *rethead = 0, *rettail = 0;
// The first token should be ";"
rethead = new Token(0);
rethead->str(";");
rethead->linenr(tok->linenr());
rethead->fileIndex(tok->fileIndex());
rettail = rethead;
bool isloop = false;
int indentlevel = 0;
int parlevel = 0;
for (; tok; tok = tok->next())
{
if (tok->str() == "{")
{
addtoken(&rettail, tok, "{");
++indentlevel;
}
else if (tok->str() == "}")
{
addtoken(&rettail, tok, "}");
if (indentlevel <= 0)
break;
--indentlevel;
}
if (tok->str() == "(")
++parlevel;
else if (tok->str() == ")")
--parlevel;
isloop &= (parlevel > 0);
if (parlevel == 0 && tok->str() == ";")
addtoken(&rettail, tok, ";");
if (varid == 0)
{
if (!callstack.empty() && Token::Match(tok, "[;{}] __cppcheck_lock|__cppcheck_unlock ( ) ;"))
{
// Type of leak = Resource leak
alloctype = dealloctype = CheckMemoryLeak::File;
if (tok->next()->str() == "__cppcheck_lock")
{
addtoken(&rettail, tok, "alloc");
}
else
{
addtoken(&rettail, tok, "dealloc");
}
tok = tok->tokAt(3);
continue;
}
if (Token::simpleMatch(tok, "if ("))
{
addtoken(&rettail, tok, "if");
tok = tok->next()->link();
continue;
}
}
else
{
// var = strcpy|.. ( var ,
if (Token::Match(tok, "[;{}] %varid% = memcpy|memmove|memset|strcpy|strncpy|strcat|strncat ( %varid% ,", varid))
{
tok = tok->tokAt(4)->link();
continue;
}
if (Token::Match(tok->previous(), "[(;{}] %varid% =", varid) ||
Token::Match(tok, "asprintf ( & %varid% ,", varid))
{
CheckMemoryLeak::AllocType alloc;
if (Token::simpleMatch(tok, "asprintf ("))
{
// todo: check how the return value is used.
if (!Token::Match(tok->previous(), "[;{}]"))
{
Tokenizer::deleteTokens(rethead);
return 0;
}
alloc = Malloc;
tok = tok->next()->link();
}
else
{
alloc = getAllocationType(tok->tokAt(2), varid);
}
bool realloc = false;
if (sz > 1 &&
Token::Match(tok->tokAt(2), "malloc ( %num% )") &&
(MathLib::toLongNumber(tok->strAt(4)) % long(sz)) != 0)
{
mismatchSizeError(tok->tokAt(4), tok->strAt(4));
}
if (alloc == CheckMemoryLeak::No)
{
alloc = getReallocationType(tok->tokAt(2), varid);
if (alloc != CheckMemoryLeak::No)
{
addtoken(&rettail, tok, "realloc");
addtoken(&rettail, tok, ";");
realloc = true;
tok = tok->tokAt(2);
continue;
}
}
// don't check classes..
if (alloc == CheckMemoryLeak::New)
{
if (Token::Match(tok->tokAt(2), "new %type% [(;]"))
{
if (isclass(_tokenizer, tok->tokAt(3)))
{
alloc = No;
}
}
else if (Token::Match(tok->tokAt(2), "new ( nothrow ) %type%"))
{
if (isclass(_tokenizer, tok->tokAt(6)))
{
alloc = No;
}
}
else if (Token::Match(tok->tokAt(2), "new ( std :: nothrow ) %type%"))
{
if (isclass(_tokenizer, tok->tokAt(8)))
{
alloc = No;
}
}
}
if (alloc != No)
{
if (! realloc)
addtoken(&rettail, tok, "alloc");
if (alloctype != No && alloctype != alloc)
alloc = Many;
if (alloc != Many && dealloctype != No && dealloctype != Many && dealloctype != alloc)
{
callstack.push_back(tok);
mismatchAllocDealloc(callstack, Token::findmatch(_tokenizer->tokens(), "%varid%", varid)->str());
callstack.pop_back();
}
alloctype = alloc;
if (Token::Match(tok, "%var% = %type% ("))
{
tok = tok->tokAt(3)->link();
continue;
}
}