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checkmemoryleak.cpp
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checkmemoryleak.cpp
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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2012 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 "symboldatabase.h"
#include "mathlib.h"
#include "tokenize.h"
#include <algorithm>
#include <cstring>
#include <cstdlib>
#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;
}
/**
* Count function parameters
* \param tok Function name token before the '('
*/
static unsigned int countParameters(const Token *tok)
{
tok = tok->tokAt(2);
if (tok->str() == ")")
return 0;
unsigned int numpar = 1;
while (NULL != (tok = tok->nextArgument()))
numpar++;
return numpar;
}
/** List of functions that can be ignored when searching for memory leaks.
* These functions don't take the address of the given pointer
* This list needs to be alphabetically sorted so we can run bsearch on it.
* This list contains function names with const parameters e.g.: atof(const char *)
* Reference: http://www.aquaphoenix.com/ref/gnu_c_library/libc_492.html#SEC492
*/
static const char * const call_func_white_list[] = {
"_open", "_wopen", "access", "adjtime", "asctime", "asctime_r", "asprintf", "assert"
, "atof", "atoi", "atol", "chdir", "chmod", "chown"
, "clearerr", "creat", "ctime", "ctime_r", "delete", "execl", "execle"
, "execlp", "execv", "execve", "fchmod", "fclose", "fcntl"
, "fdatasync", "feof", "ferror", "fflush", "fgetc", "fgetpos", "fgets"
, "flock", "fmemopen", "fnmatch", "fopen", "fopencookie", "for", "fprintf", "fputc", "fputs", "fread", "free"
, "freopen", "fscanf", "fseek", "fseeko", "fsetpos", "fstat", "fsync", "ftell", "ftello"
, "ftruncate", "fwrite", "getc", "getenv","getgrnam", "gethostbyaddr", "gethostbyname", "getnetbyname"
, "getopt", "getopt_long", "getprotobyname", "getpwnam", "gets", "getservbyname", "getservbyport"
, "glob", "gmtime", "gmtime_r", "if", "index", "inet_addr", "inet_aton", "inet_network", "initgroups", "ioctl"
, "link", "localtime", "localtime_r"
, "lockf", "lseek", "lstat", "mblen", "mbstowcs", "mbtowc", "memchr", "memcmp", "memcpy", "memmove", "memset"
, "mkdir", "mkfifo", "mknod", "mkstemp"
, "obstack_printf", "obstack_vprintf", "open", "opendir", "parse_printf_format", "pathconf"
, "perror", "popen" ,"posix_fadvise", "posix_fallocate", "pread"
, "printf", "psignal", "puts", "pwrite", "qsort", "read", "readahead", "readdir", "readdir_r"
, "readlink", "readv"
, "realloc", "regcomp", "remove", "rename", "return", "rewind", "rewinddir", "rindex"
, "rmdir" ,"scandir", "scanf", "seekdir"
, "setbuf", "setbuffer", "sethostname", "setlinebuf", "setlocale" ,"setvbuf", "sizeof" ,"snprintf", "sprintf", "sscanf"
, "stat", "stpcpy", "strcasecmp", "strcat", "strchr", "strcmp", "strcoll"
, "strcpy", "strcspn", "strdup", "stricmp", "strlen", "strncasecmp", "strncat", "strncmp"
, "strncpy", "strpbrk","strrchr", "strspn", "strstr", "strtod", "strtok", "strtol", "strtoul", "strxfrm", "switch"
, "symlink", "sync_file_range", "system", "telldir", "tempnam", "time", "typeid", "unlink"
, "utime", "utimes", "vasprintf", "vfprintf", "vfscanf", "vprintf"
, "vscanf", "vsnprintf", "vsprintf", "vsscanf", "while", "wordexp","write", "writev"
};
static int call_func_white_list_compare(const void *a, const void *b)
{
return strcmp((const char *)a, *(const char * const *)b);
}
//---------------------------------------------------------------------------
bool CheckMemoryLeak::isclass(const Tokenizer *_tokenizer, const Token *tok, unsigned int varid) const
{
if (tok->isStandardType())
return false;
const Variable * var = _tokenizer->getSymbolDatabase()->getVariableFromVarId(varid);
// return false if the type is a simple record type without side effects
// a type that has no side effects (no constructors and no members with constructors)
/** @todo false negative: check base class for side effects */
/** @todo false negative: check constructors for side effects */
if (var && var->type() && var->type()->numConstructors == 0 &&
(var->type()->varlist.empty() || var->type()->needInitialization == Scope::True) &&
var->type()->derivedFrom.empty())
return false;
return true;
}
//---------------------------------------------------------------------------
CheckMemoryLeak::AllocType CheckMemoryLeak::getAllocationType(const Token *tok2, unsigned int varid, std::list<const Token *> *callstack) 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"
};
for (unsigned int i = 0; i < sizeof(mallocfunc)/sizeof(*mallocfunc); 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"
};
for (unsigned int i = 0; i < sizeof(gmallocfunc)/sizeof(*gmallocfunc); i++) {
if (tok2->str() == gmallocfunc[i])
return gMalloc;
}
if (Token::Match(tok2, "new struct| %type% [;()]") ||
Token::Match(tok2, "new ( std :: nothrow ) struct| %type% [;()]") ||
Token::Match(tok2, "new ( nothrow ) struct| %type% [;()]"))
return New;
if (Token::Match(tok2, "new struct| %type% [") ||
Token::Match(tok2, "new ( std :: nothrow ) struct| %type% [") ||
Token::Match(tok2, "new ( nothrow ) struct| %type% ["))
return NewArray;
if (Token::Match(tok2, "fopen|tmpfile|g_fopen ("))
return File;
if (standards.posix) {
if (Token::Match(tok2, "open|openat|creat|mkstemp|mkostemp (")) {
// simple sanity check of function parameters..
// TODO: Make such check for all these functions
unsigned int num = countParameters(tok2);
if (tok2->str() == "open" && num != 2 && num != 3)
return No;
// 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;
}
// User function
const Token *ftok = tokenizer->getFunctionTokenByName(tok2->str().c_str());
if (ftok == NULL)
return No;
// Prevent recursion
if (callstack && std::find(callstack->begin(), callstack->end(), ftok) != callstack->end())
return No;
std::list<const Token *> cs;
if (!callstack)
callstack = &cs;
callstack->push_back(ftok);
return functionReturnType(ftok, callstack);
}
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 (tok && tok->str() == "::")
tok = tok->next();
if (Token::Match(tok, "free|kfree ( %varid% ) [;:]", varid) ||
Token::Match(tok, "free|kfree ( %varid% -", varid) ||
Token::Match(tok, "realloc ( %varid% , 0 ) ;", 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::simpleMatch(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::Match(tok, std::string("delete " + varname + " [,;]").c_str()))
return New;
if (Token::Match(tok, std::string("delete [ ] " + varname + " [,;]").c_str()))
return NewArray;
if (Token::Match(tok, std::string("delete ( " + varname + " ) [,;]").c_str()))
return New;
if (Token::Match(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()) ||
Token::simpleMatch(tok, std::string("realloc ( " + varname + " , 0 ) ;").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);
else
memleakError(tok, varname);
}
//---------------------------------------------------------------------------
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
{
const ErrorLogger::ErrorMessage errmsg(callstack, tokenizer?&tokenizer->list:0, severity, id, msg, false);
if (errorLogger)
errorLogger->reportErr(errmsg);
else
Check::reportError(errmsg);
}
void CheckMemoryLeak::memleakError(const Token *tok, const std::string &varname) const
{
reportErr(tok, Severity::error, "memleak", "Memory leak: " + varname);
}
void CheckMemoryLeak::memleakUponReallocFailureError(const Token *tok, const std::string &varname) const
{
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) const
{
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) const
{
reportErr(tok, Severity::error, "deallocDealloc", "Deallocating a deallocated pointer: " + varname);
}
void CheckMemoryLeak::deallocuseError(const Token *tok, const std::string &varname) const
{
reportErr(tok, Severity::error, "deallocuse", "Dereferencing '" + varname + "' after it is deallocated / released");
}
void CheckMemoryLeak::mismatchSizeError(const Token *tok, const std::string &sz) const
{
reportErr(tok, Severity::error, "mismatchSize", "The given size " + sz + " is mismatching");
}
void CheckMemoryLeak::mismatchAllocDealloc(const std::list<const Token *> &callstack, const std::string &varname) const
{
reportErr(callstack, Severity::error, "mismatchAllocDealloc", "Mismatching allocation and deallocation: " + varname);
}
CheckMemoryLeak::AllocType CheckMemoryLeak::functionReturnType(const Token *tok, std::list<const Token *> *callstack) const
{
if (!tok)
return No;
// Locate start of function
while (tok) {
if (tok->str() == "{" || tok->str() == "}")
return No;
if (tok->str() == "(") {
tok = tok->link();
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, callstack);
if (allocType != No)
return allocType;
}
}
// Not returning pointer value..
if (varid == 0)
return No;
if (this != NULL) {
// If variable is not local then alloctype shall be "No"
// Todo: there can be false negatives about mismatching allocation/deallocation.
// => Generate "alloc ; use ;" if variable is not local?
const Variable *var = tokenizer->getSymbolDatabase()->getVariableFromVarId(varid);
if (!var || !var->isLocal() || var->isStatic())
return No;
}
// Check if return pointer is allocated..
AllocType allocType = No;
while (NULL != (tok = tok->next())) {
if (Token::Match(tok, "%varid% =", varid)) {
allocType = getAllocationType(tok->tokAt(2), varid, callstack);
}
if (Token::Match(tok, "= %varid% ;", varid)) {
return No;
}
if (Token::Match(tok, "static %type% * %varid% [;{}=]", varid)) {
return No;
}
if (Token::Match(tok, "[(,] %varid% [,)]", varid)) {
return No;
}
if (tok->str() == "return")
return allocType;
}
return allocType;
}
const char *CheckMemoryLeak::functionArgAlloc(const Function *func, unsigned int targetpar, AllocType &allocType) const
{
allocType = No;
if (!func || !func->functionScope)
return "";
std::list<Variable>::const_iterator arg = func->argumentList.begin();
for (; arg != func->argumentList.end(); ++arg) {
if (arg->index() == targetpar-1)
break;
}
if (arg == func->argumentList.end())
return "";
// Is **
if (!arg->isPointer())
return "";
const Token* tok = arg->typeEndToken();
if (tok->str() == "const")
tok = tok->previous();
tok = tok->previous();
if (tok->str() != "*")
return "";
// Check if pointer is allocated.
int realloc = 0;
for (tok = func->functionScope->classStart; tok && tok != func->functionScope->classEnd; tok = tok->next()) {
if (tok->varId() == arg->varId()) {
if (Token::Match(tok->tokAt(-3), "free ( * %var% )")) {
realloc = 1;
allocType = No;
} else if (Token::Match(tok->previous(), "* %var% =")) {
allocType = getAllocationType(tok->tokAt(2), arg->varId());
if (allocType == No) {
allocType = getReallocationType(tok->tokAt(2), arg->varId());
}
if (allocType != No) {
if (realloc)
return "realloc";
return "alloc";
}
} else {
// unhandled variable usage: bailout
return "";
}
}
}
return "";
}
void CheckMemoryLeakInFunction::parse_noreturn()
{
if (noreturn.empty()) {
noreturn.insert("exit");
noreturn.insert("_exit");
noreturn.insert("_Exit");
noreturn.insert("abort");
noreturn.insert("err");
noreturn.insert("verr");
noreturn.insert("errx");
noreturn.insert("verrx");
noreturn.insert("ExitProcess");
noreturn.insert("ExitThread");
noreturn.insert("pthread_exit");
}
std::list<Scope>::const_iterator scope;
for (scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope) {
// only check functions
if (scope->type != Scope::eFunction)
continue;
// parse this function to check if it contains an "exit" call..
bool isNoreturn = false;
for (const Token *tok2 = scope->classStart->next(); tok2 != scope->classEnd; tok2 = tok2->next()) {
if (Token::Match(tok2->previous(), "[;{}] exit (")) {
isNoreturn = true;
break;
}
}
// This function is not a noreturn function
if (isNoreturn)
noreturn.insert(scope->className);
else
notnoreturn.insert(scope->className);
}
}
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));
}
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 != tok->linkAt(1); tok2 = tok2->next()) {
if (tok2->str() == "(") {
tok2 = tok2->nextArgument();
if (!tok2)
break;
}
if (tok2->varId() == varid) {
if (tok->strAt(-1) == ".")
return "use";
else if (tok2->strAt(1) == "=")
return "assign";
else
return "use_";
}
}
return 0;
}
if (noreturn.find(tok->str()) != noreturn.end() && tok->strAt(-1) != "=")
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->next(), 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";
TokenList::deleteTokens(func);
return ret;
}
// how many parameters is there in the function call?
unsigned int numpar = countParameters(tok);
if (numpar == 0) {
// Taking return value => it is not a noreturn function
if (tok->strAt(-1) == "=")
return NULL;
// Function is not noreturn
if (notnoreturn.find(funcname) != notnoreturn.end())
return NULL;
return "callfunc";
}
unsigned int par = 0;
const bool dot(tok->previous()->str() == ".");
const bool eq(tok->previous()->str() == "=");
tok = Token::findsimplematch(tok, "(");
if (tok)
tok = tok->next();
for (; tok; tok = tok->nextArgument()) {
++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 Function* function = _tokenizer->getSymbolDatabase()->findFunctionByToken(ftok);
if (!function)
return "recursive";
const Variable* param = function->getArgumentVar(par-1);
if (!param || !param->nameToken())
return "use";
if (!function->functionScope)
return "use";
Token *func = getcode(function->functionScope->classStart->next(), callstack, param->varId(), alloctype, dealloctype, false, sz);
//simplifycode(func);
const Token *func_ = func;
while (func_ && func_->str() == ";")
func_ = func_->next();
const char *ret = 0;
/** @todo handle "goto" */
if (Token::findsimplematch(func_, "dealloc"))
ret = "dealloc";
else if (Token::findsimplematch(func_, "use"))
ret = "use";
else if (Token::findsimplematch(func_, "&use"))
ret = "&use";
TokenList::deleteTokens(func);
return ret;
}
if (varid > 0 && Token::Match(tok, "& %varid% [,()]", varid)) {
const Token *ftok = _tokenizer->getFunctionTokenByName(funcname.c_str());
if (ftok == 0)
continue;
const Function* func = _tokenizer->getSymbolDatabase()->findFunctionByToken(ftok);
AllocType a;
const char *ret = functionArgAlloc(func, par, a);
if (a != No) {
if (alloctype == No)
alloctype = a;
else if (alloctype != a)
alloctype = Many;
allocpar = true;
return ret;
}
}
if (varid > 0 && Token::Match(tok, "%varid% . %var% [,)]", varid))
return "use";
}
return (eq || _settings->experimental) ? 0 : "callfunc";
}
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;
// variables whose value depends on if(!var). If one of these variables
// is used in a if-condition then generate "ifv" instead of "if".
std::set<unsigned int> extravar;
// The first token should be ";"
rethead = new Token(0);
rethead->str(";");
rethead->linenr(tok->linenr());
rethead->fileIndex(tok->fileIndex());
rettail = rethead;
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;
}
else if (tok->str() == "(")
++parlevel;
else if (tok->str() == ")")
--parlevel;
if (parlevel == 0 && tok->str() == ";")
addtoken(&rettail, tok, ";");
// Start of new statement.. check if the statement has anything interesting
if (varid > 0 && parlevel == 0 && Token::Match(tok, "[;{}]")) {
if (Token::Match(tok->next(), "[{};]"))
continue;
// function calls are interesting..
const Token *tok2 = tok;
while (Token::Match(tok2->next(), "%var% ."))
tok2 = tok2->tokAt(2);
if (Token::Match(tok2->next(), "%var% ("))
;
else if (Token::Match(tok->next(), "continue|break|return|throw|goto|do|else"))
;
else {
const Token *skipToToken = 0;
// scan statement for interesting keywords / varid
for (tok2 = tok->next(); tok2; tok2 = tok2->next()) {
if (tok2->str() == ";") {
// nothing interesting found => skip this statement
skipToToken = tok2->previous();
break;
}
if (tok2->varId() == varid ||
tok2->str() == ":" || tok2->str() == "{" || tok2->str() == "}") {
break;
}
}
if (skipToToken) {
tok = skipToToken;
continue;
}
}
}
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 {
if (Token::Match(tok, "%varid% = close ( %varid% )", varid)) {
addtoken(&rettail, tok, "dealloc");
addtoken(&rettail, tok, ";");
addtoken(&rettail, tok, "assign");
addtoken(&rettail, tok, ";");
tok = tok->tokAt(5);
continue;
}
// var = strcpy|.. ( var ,
if (Token::Match(tok, "[;{}] %varid% = memcpy|memmove|memset|strcpy|strncpy|strcat|strncat ( %varid% ,", varid)) {
tok = tok->linkAt(4);
continue;
}
if (Token::Match(tok->previous(), "[(;{}] %varid% =", varid) ||
Token::Match(tok, "asprintf|vasprintf ( & %varid% ,", varid)) {
CheckMemoryLeak::AllocType alloc;
if (Token::Match(tok, "asprintf|vasprintf (")) {
// todo: check how the return value is used.
if (!Token::Match(tok->previous(), "[;{}]")) {
TokenList::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);
if (Token::Match(tok, "%var% ("))
tok = tok->next()->link();
continue;
}
}
// don't check classes..
if (alloc == CheckMemoryLeak::New) {
if (Token::Match(tok->tokAt(2), "new struct| %type% [(;]")) {
const int offset = tok->strAt(3) == "struct" ? 1 : 0;
if (isclass(_tokenizer, tok->tokAt(3 + offset), varid)) {
alloc = No;
}
} else if (Token::Match(tok->tokAt(2), "new ( nothrow ) struct| %type%")) {
const int offset = tok->strAt(6) == "struct" ? 1 : 0;
if (isclass(_tokenizer, tok->tokAt(6 + offset), varid)) {
alloc = No;
}
} else if (Token::Match(tok->tokAt(2), "new ( std :: nothrow ) struct| %type%")) {
const int offset = tok->strAt(8) == "struct" ? 1 : 0;
if (isclass(_tokenizer, tok->tokAt(8 + offset), varid)) {
alloc = No;
}
}
if (alloc == No && alloctype == No)
alloctype = CheckMemoryLeak::New;
}
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->linkAt(3);
continue;
}
}
// assignment..
else {
// is the pointer in rhs?
bool rhs = false;
for (const Token *tok2 = tok->next(); tok2; tok2 = tok2->next()) {
if (tok2->str() == ";") {
if (rhs)
tok = tok2;
break;
}
if (Token::Match(tok2, "[=+(,] %varid%", varid)) {
if (!rhs && Token::Match(tok2, "[(,]")) {
addtoken(&rettail, tok, "use");
addtoken(&rettail, tok, ";");
}
rhs = true;
}
}
if (!rhs)
addtoken(&rettail, tok, "assign");
continue;
}
}
if (Token::Match(tok->previous(), "[;{})=|] ::| %var%")) {
if (Token::Match(tok, "%varid% ?", varid))
tok = tok->tokAt(2);
AllocType dealloc = getDeallocationType(tok, varid);
if (dealloc != No && tok->str() == "fcloseall" && alloctype != dealloc)
dealloc = No;
else if (dealloc != No) {