358 lines
12 KiB
C++
358 lines
12 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2009 Daniel Marjamäki and 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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/// @addtogroup Checks
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/// @{
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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 two 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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*/
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#include "check.h"
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#include <list>
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#include <string>
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#include <vector>
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class Token;
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/** @brief Base class for memory leaks checking */
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class CheckMemoryLeak
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{
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private:
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const Tokenizer * const tokenizer;
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ErrorLogger * const errorLogger;
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/** Disable the default constructors */
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CheckMemoryLeak();
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/** Disable the default constructors */
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CheckMemoryLeak(const CheckMemoryLeak &);
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/** disable assignment operator */
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void operator=(const CheckMemoryLeak &);
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/**
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* Report error. Similar with the function Check::reportError
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* @param location 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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*/
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void reportErr(const Token *location, Severity::e severity, const std::string &id, const std::string &msg) 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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*/
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void reportErr(const std::list<const Token *> &callstack, Severity::e severity, const std::string &id, const std::string &msg) const;
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public:
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CheckMemoryLeak(const Tokenizer *t, ErrorLogger *e)
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: tokenizer(t), errorLogger(e)
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{
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}
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/** 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, gMalloc, New, NewArray, File, Fd, Pipe, Dir, Many };
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void memoryLeak(const Token *tok, const std::string &varname, AllocType alloctype, bool all);
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/**
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* Get type of deallocation at given position
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* @param tok position
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* @param varnames variable names
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* @return type of deallocation
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*/
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AllocType getDeallocationType(const Token *tok, const char *varnames[]) const;
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/**
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* 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, unsigned int varid) const;
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/**
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* Get type of allocation at given position
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*/
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AllocType getAllocationType(const Token *tok2, unsigned int varid) const;
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/**
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* Get type of reallocation at given position
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*/
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AllocType getReallocationType(const Token *tok2, unsigned int varid) const;
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bool isclass(const Tokenizer *_tokenizer, const Token *typestr) const;
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void memleakError(const Token *tok, const std::string &varname, bool all);
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void resourceLeakError(const Token *tok, const std::string &varname, bool all);
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void deallocDeallocError(const Token *tok, const std::string &varname);
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void deallocuseError(const Token *tok, const std::string &varname);
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void mismatchSizeError(const Token *tok, const std::string &sz);
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void mismatchAllocDealloc(const std::list<const Token *> &callstack, const std::string &varname);
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/** What type of allocated memory does the given function return? */
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AllocType functionReturnType(const Token *tok) const;
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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 CheckMemoryLeakInFunction : private Check, private CheckMemoryLeak
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{
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public:
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/** This constructor is used when registering this class */
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CheckMemoryLeakInFunction() : Check(), CheckMemoryLeak(0, 0)
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{ }
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/** 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(tokenizer, settings, errorLogger), CheckMemoryLeak(tokenizer, errorLogger)
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{ }
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void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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{
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CheckMemoryLeakInFunction checkMemoryLeak(tokenizer, settings, errorLogger);
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checkMemoryLeak.check();
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}
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void check();
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#ifndef _MSC_VER
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private:
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#endif
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bool matchFunctionsThatReturnArg(const Token *tok, unsigned int varid) const;
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/**
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* Check if there is a "!var" match inside a condition
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* @param tok first token to match
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* @param varid variabla id
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* @param endpar if this is true the "!var" must be followed by ")"
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* @return true if match
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*/
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bool notvar(const Token *tok, unsigned int varid, bool endpar = false) const;
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/**
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* Inspect a function call. the call_func and getcode are recursive
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* @param tok token where the function call occurs
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* @param callstack callstack
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* @param varid variable id to check
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* @param alloctype if memory is allocated, this indicates the type of allocation
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* @param dealloctype if memory is deallocated, this indicates the type of deallocation
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* @param all is the code simplified according to the "--all" rules or not?
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* @param sz not used by call_func - see getcode
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* @return These are the possible return values:
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* - NULL : no significant code
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* - "recursive" : recursive function
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* - "alloc" : the function returns allocated memory
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* - "dealloc" : the function deallocates the variable
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* - "dealloc_"
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* - "use" : the variable is used (unknown usage of the variable => the checking bails out)
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* - "callfunc"
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* - "&use"
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*/
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const char * call_func(const Token *tok, std::list<const Token *> callstack, const unsigned int varid, AllocType &alloctype, AllocType &dealloctype, bool &all, unsigned int sz);
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/**
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* Extract a new tokens list that is easier to parse than the "_tokenizer->tokens()", the
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* extracted tokens list describes how the given variable is used.
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* The getcode and call_func are recursive
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* @param tok start parse token
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* @param callstack callstack
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* @param varid variable id
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* @param alloctype keep track of what type of allocation is used
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* @param dealloctype keeps track of what type of deallocation is used
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* @param classmember should be set if the inspected function is a class member
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* @param all has the getcode been simplified according to the "--all" rules?
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* @param sz size of type, used to check for mismatching size of allocation. for example "int *a;" => the sz is "sizeof(int)"
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* @return Newly allocated token array. Caller needs to release reserved
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* memory by calling Tokenizer::deleteTokens(returnValue);
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* Returned tokens:
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* - alloc : the variable is allocated
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* - dealloc : the variable is deallocated
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* - realloc : the variable is reallocated
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* - use : unknown usage -> bail out checking of this execution path
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* - &use : the address of the variable is taken
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* - ::use : calling member function of class
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* - assign : the variable is assigned a new value
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* - if : there is an "if"
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* - if(var) : corresponds with "if ( var != 0 )"
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* - if(!var) : corresponds with "if ( var == 0 )"
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* - ifv : the variable is used in some way in a "if"
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* - loop : corresponds to either a "for" or a "while"
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* - continue : corresponds to "continue"
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* - break : corresponds to "break"
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* - goto : corresponds to a "goto"
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* - return : corresponds to a "return"
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*/
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Token *getcode(const Token *tok, std::list<const Token *> callstack, const unsigned int varid, AllocType &alloctype, AllocType &dealloctype, bool classmember, bool &all, unsigned int sz);
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/**
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* Simplify code e.g. by replacing empty "{ }" with ";"
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* @param tok first token. The tokens list can be modified.
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* @param all is the code simplified according to the "--all" rules or not
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*/
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void simplifycode(Token *tok, bool &all);
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static const Token *findleak(const Token *tokens, bool all);
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/**
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* Checking the variable varname
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* @param Tok1 start token
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* @param varname name of variable (for error messages)
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* @param varid variable id
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* @param classmember is the scope inside a class member function
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* @param sz size of type.. if the variable is a "int *" then sz should be "sizeof(int)"
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*/
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void checkScope(const Token *Tok1, const std::string &varname, unsigned int varid, bool classmember, unsigned int sz);
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void getErrorMessages()
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{
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memleakError(0, "varname", false);
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resourceLeakError(0, "varname", false);
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deallocDeallocError(0, "varname");
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deallocuseError(0, "varname");
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mismatchSizeError(0, "sz");
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std::list<const Token *> callstack;
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mismatchAllocDealloc(callstack, "varname");
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}
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std::string name() const
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{
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return "Memory leaks (function variables)";
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}
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std::string classInfo() const
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{
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return "Is there any allocated memory when a function goes out of scope";
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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 CheckMemoryLeakInClass : private Check, private CheckMemoryLeak
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{
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public:
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CheckMemoryLeakInClass() : Check(), CheckMemoryLeak(0, 0)
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{ }
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CheckMemoryLeakInClass(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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: Check(tokenizer, settings, errorLogger), CheckMemoryLeak(tokenizer, errorLogger)
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{ }
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void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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{
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CheckMemoryLeakInClass checkMemoryLeak(tokenizer, settings, errorLogger);
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checkMemoryLeak.check();
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}
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void check();
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private:
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void parseClass(const Token *tok1, std::vector<const char *> &classname);
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void variable(const char classname[], const Token *tokVarname);
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void getErrorMessages()
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{ }
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std::string name() const
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{
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return "Memory leaks (class variables)";
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}
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std::string classInfo() const
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{
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return "If the constructor allocate memory then the destructor must deallocate it.";
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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 CheckMemoryLeakStructMember : private Check, private CheckMemoryLeak
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{
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public:
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CheckMemoryLeakStructMember() : Check(), CheckMemoryLeak(0, 0)
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{ }
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CheckMemoryLeakStructMember(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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: Check(tokenizer, settings, errorLogger), CheckMemoryLeak(tokenizer, errorLogger)
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{ }
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void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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{
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CheckMemoryLeakStructMember checkMemoryLeak(tokenizer, settings, errorLogger);
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checkMemoryLeak.check();
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}
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void check();
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private:
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void getErrorMessages()
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{ }
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std::string name() const
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{
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return "Memory leaks (struct members)";
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}
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std::string classInfo() const
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{
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return "Don't forget to deallocate struct members";
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}
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};
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/// @}
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//---------------------------------------------------------------------------
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#endif
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