364 lines
13 KiB
C++
364 lines
13 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2023 Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//---------------------------------------------------------------------------
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#ifndef checkmemoryleakH
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#define checkmemoryleakH
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//---------------------------------------------------------------------------
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/**
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* @file
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*
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* %Check for memory leaks
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*
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* The checking is split up into three specialized classes.
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* - CheckMemoryLeakInFunction can detect when a function variable is allocated but not deallocated properly.
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* - CheckMemoryLeakInClass can detect when a class variable is allocated but not deallocated properly.
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* - CheckMemoryLeakStructMember checks allocation/deallocation of structs and struct members
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*/
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#include "check.h"
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#include "config.h"
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#include "errortypes.h"
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#include "tokenize.h"
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#include <list>
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#include <string>
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class Function;
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class Scope;
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class Settings;
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class Token;
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class Variable;
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class ErrorLogger;
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/// @addtogroup Core
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/// @{
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/** @brief Base class for memory leaks checking */
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class CPPCHECKLIB CheckMemoryLeak {
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private:
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/** For access to the tokens */
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const Tokenizer * const mTokenizer_;
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/** ErrorLogger used to report errors */
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ErrorLogger * const mErrorLogger_;
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/** Enabled standards */
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const Settings * const mSettings_;
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/**
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* Report error. Similar with the function Check::reportError
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* @param tok the token where the error occurs
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* @param severity the severity of the bug
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* @param id type of message
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* @param msg text
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* @param cwe cwe number
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*/
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void reportErr(const Token *tok, Severity severity, const std::string &id, const std::string &msg, const CWE &cwe) const;
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/**
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* Report error. Similar with the function Check::reportError
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* @param callstack callstack of error
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* @param severity the severity of the bug
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* @param id type of message
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* @param msg text
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* @param cwe cwe number
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*/
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void reportErr(const std::list<const Token *> &callstack, Severity severity, const std::string &id, const std::string &msg, const CWE &cwe) const;
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public:
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CheckMemoryLeak() = delete;
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CheckMemoryLeak(const CheckMemoryLeak &) = delete;
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void operator=(const CheckMemoryLeak &) = delete;
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CheckMemoryLeak(const Tokenizer *t, ErrorLogger *e, const Settings *s)
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: mTokenizer_(t), mErrorLogger_(e), mSettings_(s) {}
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/** @brief What type of allocation are used.. the "Many" means that several types of allocation and deallocation are used */
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enum AllocType { No, Malloc, New, NewArray, File, Fd, Pipe, OtherMem, OtherRes, Many };
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void memoryLeak(const Token *tok, const std::string &varname, AllocType alloctype) const;
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/**
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* @brief Get type of deallocation at given position
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* @param tok position
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* @param varid variable id
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* @return type of deallocation
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*/
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AllocType getDeallocationType(const Token *tok, nonneg int varid) const;
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/**
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* @brief Get type of allocation at given position
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*/
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AllocType getAllocationType(const Token *tok2, nonneg int varid, std::list<const Function*> *callstack = nullptr) const;
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/**
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* @brief Get type of reallocation at given position
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*/
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AllocType getReallocationType(const Token *tok2, nonneg int varid) const;
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/**
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* Check if token reopens a standard stream
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* @param tok token to check
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*/
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bool isReopenStandardStream(const Token *tok) const;
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/**
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* Check if token opens /dev/null
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* @param tok token to check
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*/
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bool isOpenDevNull(const Token *tok) const;
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/**
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* Report that there is a memory leak (new/malloc/etc)
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* @param tok token where memory is leaked
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* @param varname name of variable
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*/
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void memleakError(const Token *tok, const std::string &varname) const;
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/**
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* Report that there is a resource leak (fopen/popen/etc)
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* @param tok token where resource is leaked
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* @param varname name of variable
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*/
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void resourceLeakError(const Token *tok, const std::string &varname) const;
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void deallocuseError(const Token *tok, const std::string &varname) const;
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void mismatchAllocDealloc(const std::list<const Token *> &callstack, const std::string &varname) const;
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void memleakUponReallocFailureError(const Token *tok, const std::string &reallocfunction, const std::string &varname) const;
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/** What type of allocated memory does the given function return? */
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AllocType functionReturnType(const Function* func, std::list<const Function*> *callstack = nullptr) const;
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};
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/// @}
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/// @addtogroup Checks
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/// @{
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/**
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* @brief %CheckMemoryLeakInFunction detects when a function variable is allocated but not deallocated properly.
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*
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* The checking is done by looking at each function variable separately. By repeating these 4 steps over and over:
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* -# locate a function variable
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* -# create a simple token list that describes the usage of the function variable.
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* -# simplify the token list.
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* -# finally, check if the simplified token list contain any leaks.
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*/
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class CPPCHECKLIB CheckMemoryLeakInFunction : public Check, public CheckMemoryLeak {
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friend class TestMemleakInFunction;
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public:
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/** @brief This constructor is used when registering this class */
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CheckMemoryLeakInFunction() : Check(myName()), CheckMemoryLeak(nullptr, nullptr, nullptr) {}
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private:
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/** @brief This constructor is used when running checks */
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CheckMemoryLeakInFunction(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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: Check(myName(), tokenizer, settings, errorLogger), CheckMemoryLeak(tokenizer, errorLogger, settings) {}
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void runChecks(const Tokenizer &tokenizer, ErrorLogger *errorLogger) override {
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CheckMemoryLeakInFunction checkMemoryLeak(&tokenizer, tokenizer.getSettings(), errorLogger);
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checkMemoryLeak.checkReallocUsage();
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}
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/**
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* Checking for a memory leak caused by improper realloc usage.
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*/
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void checkReallocUsage();
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/** Report all possible errors (for the --errorlist) */
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void getErrorMessages(ErrorLogger *e, const Settings *settings) const override {
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CheckMemoryLeakInFunction c(nullptr, settings, e);
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c.memleakError(nullptr, "varname");
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c.resourceLeakError(nullptr, "varname");
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c.deallocuseError(nullptr, "varname");
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const std::list<const Token *> callstack;
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c.mismatchAllocDealloc(callstack, "varname");
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c.memleakUponReallocFailureError(nullptr, "realloc", "varname");
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}
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/**
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* Get name of class (--doc)
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* @return name of class
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*/
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static std::string myName() {
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return "Memory leaks (function variables)";
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}
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/**
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* Get class information (--doc)
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* @return Wiki formatted information about this class
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*/
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std::string classInfo() const override {
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return "Is there any allocated memory when a function goes out of scope\n";
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}
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};
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/**
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* @brief %Check class variables, variables that are allocated in the constructor should be deallocated in the destructor
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*/
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class CPPCHECKLIB CheckMemoryLeakInClass : public Check, private CheckMemoryLeak {
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friend class TestMemleakInClass;
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public:
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CheckMemoryLeakInClass() : Check(myName()), CheckMemoryLeak(nullptr, nullptr, nullptr) {}
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private:
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CheckMemoryLeakInClass(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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: Check(myName(), tokenizer, settings, errorLogger), CheckMemoryLeak(tokenizer, errorLogger, settings) {}
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void runChecks(const Tokenizer &tokenizer, ErrorLogger *errorLogger) override {
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if (!tokenizer.isCPP())
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return;
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CheckMemoryLeakInClass checkMemoryLeak(&tokenizer, tokenizer.getSettings(), errorLogger);
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checkMemoryLeak.check();
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}
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void check();
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void variable(const Scope *scope, const Token *tokVarname);
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/** Public functions: possible double-allocation */
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void checkPublicFunctions(const Scope *scope, const Token *classtok);
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void publicAllocationError(const Token *tok, const std::string &varname);
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void unsafeClassError(const Token *tok, const std::string &classname, const std::string &varname);
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void getErrorMessages(ErrorLogger *e, const Settings *settings) const override {
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CheckMemoryLeakInClass c(nullptr, settings, e);
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c.publicAllocationError(nullptr, "varname");
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c.unsafeClassError(nullptr, "class", "class::varname");
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}
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static std::string myName() {
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return "Memory leaks (class variables)";
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}
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std::string classInfo() const override {
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return "If the constructor allocate memory then the destructor must deallocate it.\n";
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}
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};
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/** @brief detect simple memory leaks for struct members */
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class CPPCHECKLIB CheckMemoryLeakStructMember : public Check, private CheckMemoryLeak {
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friend class TestMemleakStructMember;
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public:
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CheckMemoryLeakStructMember() : Check(myName()), CheckMemoryLeak(nullptr, nullptr, nullptr) {}
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private:
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CheckMemoryLeakStructMember(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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: Check(myName(), tokenizer, settings, errorLogger), CheckMemoryLeak(tokenizer, errorLogger, settings) {}
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void runChecks(const Tokenizer &tokenizer, ErrorLogger *errorLogger) override {
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CheckMemoryLeakStructMember checkMemoryLeak(&tokenizer, tokenizer.getSettings(), errorLogger);
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checkMemoryLeak.check();
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}
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void check();
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/** Is local variable allocated with malloc? */
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bool isMalloc(const Variable *variable) const;
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void checkStructVariable(const Variable* const variable) const;
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void getErrorMessages(ErrorLogger * /*errorLogger*/, const Settings * /*settings*/) const override {}
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static std::string myName() {
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return "Memory leaks (struct members)";
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}
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std::string classInfo() const override {
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return "Don't forget to deallocate struct members\n";
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}
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};
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/** @brief detect simple memory leaks (address not taken) */
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class CPPCHECKLIB CheckMemoryLeakNoVar : public Check, private CheckMemoryLeak {
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friend class TestMemleakNoVar;
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public:
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CheckMemoryLeakNoVar() : Check(myName()), CheckMemoryLeak(nullptr, nullptr, nullptr) {}
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private:
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CheckMemoryLeakNoVar(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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: Check(myName(), tokenizer, settings, errorLogger), CheckMemoryLeak(tokenizer, errorLogger, settings) {}
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void runChecks(const Tokenizer &tokenizer, ErrorLogger *errorLogger) override {
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CheckMemoryLeakNoVar checkMemoryLeak(&tokenizer, tokenizer.getSettings(), errorLogger);
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checkMemoryLeak.check();
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}
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void check();
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/**
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* @brief %Check if an input argument to a function is the return value of an allocation function
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* like malloc(), and the function does not release it.
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* @param scope The scope of the function to check.
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*/
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void checkForUnreleasedInputArgument(const Scope *scope);
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/**
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* @brief %Check if a call to an allocation function like malloc() is made and its return value is not assigned.
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* @param scope The scope of the function to check.
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*/
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void checkForUnusedReturnValue(const Scope *scope);
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/**
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* @brief %Check if an exception could cause a leak in an argument constructed with shared_ptr/unique_ptr.
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* @param scope The scope of the function to check.
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*/
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void checkForUnsafeArgAlloc(const Scope *scope);
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void functionCallLeak(const Token *loc, const std::string &alloc, const std::string &functionCall);
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void returnValueNotUsedError(const Token* tok, const std::string &alloc);
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void unsafeArgAllocError(const Token *tok, const std::string &funcName, const std::string &ptrType, const std::string &objType);
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void getErrorMessages(ErrorLogger *e, const Settings *settings) const override {
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CheckMemoryLeakNoVar c(nullptr, settings, e);
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c.functionCallLeak(nullptr, "funcName", "funcName");
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c.returnValueNotUsedError(nullptr, "funcName");
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c.unsafeArgAllocError(nullptr, "funcName", "shared_ptr", "int");
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}
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static std::string myName() {
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return "Memory leaks (address not taken)";
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}
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std::string classInfo() const override {
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return "Not taking the address to allocated memory\n";
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}
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};
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/// @}
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//---------------------------------------------------------------------------
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#endif // checkmemoryleakH
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