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CheckMemoryLeakInFunction Class Reference

CheckMemoryLeakInFunction detects when a function variable is allocated but not deallocated properly. More...

#include <checkmemoryleak.h>

Inheritance diagram for CheckMemoryLeakInFunction:
Check CheckMemoryLeak

Public Member Functions

 CheckMemoryLeakInFunction ()
 This constructor is used when registering this class. More...
 
- Public Member Functions inherited from Check
 Check (const std::string &aname)
 This constructor is used when registering the CheckClass. More...
 
virtual ~Check ()
 
 Check (const Check &)=delete
 
Checkoperator= (const Check &)=delete
 
const std::string & name () const
 class name, used to generate documentation More...
 
virtual FileInfogetFileInfo (const Tokenizer &, const Settings &) const
 
virtual FileInfoloadFileInfoFromXml (const tinyxml2::XMLElement *xmlElement) const
 
virtual bool analyseWholeProgram (const CTU::FileInfo *ctu, const std::list< FileInfo * > &fileInfo, const Settings &, ErrorLogger &)
 
- Public Member Functions inherited from CheckMemoryLeak
 CheckMemoryLeak ()=delete
 
 CheckMemoryLeak (const CheckMemoryLeak &)=delete
 
CheckMemoryLeakoperator= (const CheckMemoryLeak &)=delete
 
 CheckMemoryLeak (const Tokenizer *t, ErrorLogger *e, const Settings *s)
 
void memoryLeak (const Token *tok, const std::string &varname, AllocType alloctype) const
 
AllocType getDeallocationType (const Token *tok, nonneg int varid) const
 Get type of deallocation at given position. More...
 
AllocType getAllocationType (const Token *tok2, nonneg int varid, std::list< const Function * > *callstack=nullptr) const
 Get type of allocation at given position. More...
 
AllocType getReallocationType (const Token *tok2, nonneg int varid) const
 Get type of reallocation at given position. More...
 
bool isReopenStandardStream (const Token *tok) const
 Check if token reopens a standard stream. More...
 
bool isOpenDevNull (const Token *tok) const
 Check if token opens /dev/null. More...
 
void memleakError (const Token *tok, const std::string &varname) const
 Report that there is a memory leak (new/malloc/etc) More...
 
void resourceLeakError (const Token *tok, const std::string &varname) const
 Report that there is a resource leak (fopen/popen/etc) More...
 
void deallocuseError (const Token *tok, const std::string &varname) const
 
void mismatchAllocDealloc (const std::list< const Token * > &callstack, const std::string &varname) const
 
void memleakUponReallocFailureError (const Token *tok, const std::string &reallocfunction, const std::string &varname) const
 
AllocType functionReturnType (const Function *func, std::list< const Function * > *callstack=nullptr) const
 What type of allocated memory does the given function return? More...
 

Private Member Functions

 CheckMemoryLeakInFunction (const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
 This constructor is used when running checks. More...
 
void runChecks (const Tokenizer &tokenizer, ErrorLogger *errorLogger) override
 run checks, the token list is not simplified More...
 
void checkReallocUsage ()
 Checking for a memory leak caused by improper realloc usage. More...
 
void getErrorMessages (ErrorLogger *e, const Settings *settings) const override
 Report all possible errors (for the –errorlist) More...
 
std::string classInfo () const override
 Get class information (–doc) More...
 

Static Private Member Functions

static std::string myName ()
 Get name of class (–doc) More...
 

Friends

class TestMemleakInFunction
 

Additional Inherited Members

- Public Types inherited from CheckMemoryLeak
enum  AllocType {
  No , Malloc , New , NewArray ,
  File , Fd , Pipe , OtherMem ,
  OtherRes , Many
}
 What type of allocation are used. More...
 
- Static Public Member Functions inherited from Check
static std::list< Check * > & instances ()
 List of registered check classes. More...
 
static void writeToErrorList (const ErrorMessage &errmsg)
 Write given error to stdout in xml format. More...
 
- Protected Member Functions inherited from Check
 Check (std::string aname, const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
 This constructor is used when running checks. More...
 
void reportError (const Token *tok, const Severity severity, const std::string &id, const std::string &msg)
 report an error More...
 
void reportError (const Token *tok, const Severity severity, const std::string &id, const std::string &msg, const CWE &cwe, Certainty certainty)
 report an error More...
 
void reportError (const std::list< const Token * > &callstack, Severity severity, const std::string &id, const std::string &msg)
 report an error More...
 
void reportError (const std::list< const Token * > &callstack, Severity severity, const std::string &id, const std::string &msg, const CWE &cwe, Certainty certainty)
 report an error More...
 
void reportError (const ErrorPath &errorPath, Severity severity, const char id[], const std::string &msg, const CWE &cwe, Certainty certainty)
 
void logChecker (const char id[])
 log checker More...
 
ErrorPath getErrorPath (const Token *errtok, const ValueFlow::Value *value, std::string bug) const
 
bool wrongData (const Token *tok, const char *str)
 Use WRONG_DATA in checkers when you check for wrong data. More...
 
- Static Protected Member Functions inherited from Check
static std::string getMessageId (const ValueFlow::Value &value, const char id[])
 
- Protected Attributes inherited from Check
const Tokenizer *const mTokenizer {}
 
const Settings *const mSettings {}
 
ErrorLogger *const mErrorLogger {}
 

Detailed Description

CheckMemoryLeakInFunction detects when a function variable is allocated but not deallocated properly.

The checking is done by looking at each function variable separately. By repeating these 4 steps over and over:

  1. locate a function variable
  2. create a simple token list that describes the usage of the function variable.
  3. simplify the token list.
  4. finally, check if the simplified token list contain any leaks.

Definition at line 167 of file checkmemoryleak.h.

Constructor & Destructor Documentation

◆ CheckMemoryLeakInFunction() [1/2]

CheckMemoryLeakInFunction::CheckMemoryLeakInFunction ( )
inline

This constructor is used when registering this class.

Definition at line 172 of file checkmemoryleak.h.

◆ CheckMemoryLeakInFunction() [2/2]

CheckMemoryLeakInFunction::CheckMemoryLeakInFunction ( const Tokenizer tokenizer,
const Settings settings,
ErrorLogger errorLogger 
)
inlineprivate

This constructor is used when running checks.

Definition at line 176 of file checkmemoryleak.h.

Member Function Documentation

◆ checkReallocUsage()

void CheckMemoryLeakInFunction::checkReallocUsage ( )
private

◆ classInfo()

std::string CheckMemoryLeakInFunction::classInfo ( ) const
inlineoverrideprivatevirtual

Get class information (–doc)

Returns
Wiki formatted information about this class

Implements Check.

Definition at line 212 of file checkmemoryleak.h.

◆ getErrorMessages()

void CheckMemoryLeakInFunction::getErrorMessages ( ErrorLogger e,
const Settings settings 
) const
inlineoverrideprivatevirtual

◆ myName()

static std::string CheckMemoryLeakInFunction::myName ( )
inlinestaticprivate

Get name of class (–doc)

Returns
name of class

Definition at line 204 of file checkmemoryleak.h.

◆ runChecks()

void CheckMemoryLeakInFunction::runChecks ( const Tokenizer ,
ErrorLogger  
)
inlineoverrideprivatevirtual

run checks, the token list is not simplified

Implements Check.

Definition at line 179 of file checkmemoryleak.h.

References checkReallocUsage(), and Tokenizer::getSettings().

Friends And Related Function Documentation

◆ TestMemleakInFunction

friend class TestMemleakInFunction
friend

Definition at line 168 of file checkmemoryleak.h.


The documentation for this class was generated from the following files: