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/* -*- C++ -*-
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2025 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/>.
*/
//---------------------------------------------------------------------------
#ifndef checkleakautovarH
#define checkleakautovarH
//---------------------------------------------------------------------------
#include "check.h"
#include "config.h"
#include "library.h"
#include <cstdint>
#include <map>
#include <set>
#include <string>
#include <utility>
class ErrorLogger;
class Settings;
class Token;
class Tokenizer;
class CPPCHECKLIB VarInfo {
public:
enum AllocStatus : std::int8_t { REALLOC = -3, OWNED = -2, DEALLOC = -1, NOALLOC = 0, ALLOC = 1 };
struct AllocInfo {
AllocStatus status;
/** Allocation type. If it is a positive value then it corresponds to
* a Library allocation id. A negative value is a builtin
* checkleakautovar allocation type.
*/
int type;
int reallocedFromType = -1;
const Token * allocTok;
explicit AllocInfo(int type_ = 0, AllocStatus status_ = NOALLOC, const Token* allocTok_ = nullptr) : status(status_), type(type_), allocTok(allocTok_) {}
bool managed() const {
return status < 0;
}
};
enum Usage : std::uint8_t { USED, NORET };
std::map<int, AllocInfo> alloctype;
std::map<int, std::pair<const Token*, Usage>> possibleUsage;
std::set<int> conditionalAlloc;
std::set<int> referenced;
void clear() {
alloctype.clear();
possibleUsage.clear();
conditionalAlloc.clear();
referenced.clear();
}
void erase(nonneg int varid) {
alloctype.erase(varid);
possibleUsage.erase(varid);
conditionalAlloc.erase(varid);
referenced.erase(varid);
}
void swap(VarInfo &other) NOEXCEPT {
alloctype.swap(other.alloctype);
possibleUsage.swap(other.possibleUsage);
conditionalAlloc.swap(other.conditionalAlloc);
referenced.swap(other.referenced);
}
void reallocToAlloc(nonneg int varid) {
const AllocInfo& alloc = alloctype[varid];
if (alloc.reallocedFromType >= 0) {
const auto it = alloctype.find(alloc.reallocedFromType);
if (it != alloctype.end() && it->second.status == REALLOC) {
it->second.status = ALLOC;
}
}
}
/** set possible usage for all variables */
void possibleUsageAll(const std::pair<const Token*, Usage>& functionUsage);
};
/// @addtogroup Checks
/// @{
/**
* @brief Check for leaks
*/
class CPPCHECKLIB CheckLeakAutoVar : public Check {
public:
/** This constructor is used when registering the CheckLeakAutoVar */
CheckLeakAutoVar() : Check(myName()) {}
private:
/** This constructor is used when running checks. */
CheckLeakAutoVar(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
: Check(myName(), tokenizer, settings, errorLogger) {}
void runChecks(const Tokenizer &tokenizer, ErrorLogger *errorLogger) override;
/** check for leaks in all scopes */
void check();
/** check for leaks in a function scope */
bool checkScope(const Token * startToken,
VarInfo &varInfo,
std::set<int> notzero,
nonneg int recursiveCount);
/** Check token inside expression.
* @param tok token inside expression.
* @param varInfo Variable info
* @return next token to process (if no other checks needed for this token). NULL if other checks could be performed.
*/
const Token * checkTokenInsideExpression(const Token * tok, VarInfo &varInfo, bool inFuncCall = false);
/** parse function call */
void functionCall(const Token *tokName, const Token *tokOpeningPar, VarInfo &varInfo, const VarInfo::AllocInfo& allocation, const Library::AllocFunc* af);
/** parse changes in allocation status */
void changeAllocStatus(VarInfo &varInfo, const VarInfo::AllocInfo& allocation, const Token* tok, const Token* arg);
/** update allocation status if reallocation function */
void changeAllocStatusIfRealloc(std::map<int, VarInfo::AllocInfo> &alloctype, const Token *fTok, const Token *retTok) const;
/** return. either "return" or end of variable scope is seen */
void ret(const Token *tok, VarInfo &varInfo, bool isEndOfScope = false);
/** if variable is allocated then there is a leak */
void leakIfAllocated(const Token *vartok, const VarInfo &varInfo);
void leakError(const Token* tok, const std::string &varname, int type) const;
void mismatchError(const Token* deallocTok, const Token* allocTok, const std::string &varname) const;
void deallocUseError(const Token *tok, const std::string &varname) const;
void deallocReturnError(const Token *tok, const Token *deallocTok, const std::string &varname);
void doubleFreeError(const Token *tok, const Token *prevFreeTok, const std::string &varname, int type);
/** message: user configuration is needed to complete analysis */
void configurationInfo(const Token* tok, const std::pair<const Token*, VarInfo::Usage>& functionUsage);
void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const override;
static std::string myName() {
return "Leaks (auto variables)";
}
std::string classInfo() const override {
return "Detect when a auto variable is allocated but not deallocated or deallocated twice.\n";
}
};
/// @}
//---------------------------------------------------------------------------
#endif // checkleakautovarH
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