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V1020. Function exited without performi…
Analyzer diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
Customer specific requests (C++)
MISRA errors
AUTOSAR errors
OWASP errors (C#)
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Additional information
Contents

V1020. Function exited without performing epilogue actions. It is possible that there is an error.

09 Jui 2018

The analyzer has detected a function body that contains a block of code starting and ending with calls to functions with opposite names, while the code between these calls contains a condition causing the function under analysis to return without calling the epilogue function.

Consider the following example:

int pthread_cond_destroy(pthread_cond_t * cond)
{ 
  EnterCriticalSection(&ptw32_cond_list_lock);
  /* ... */  
  if (sem_wait (&(cv->semBlockLock)) != 0)
  {
    return errno; // <= V1020 Warning
  }
  /* ... */
  LeaveCriticalSection(&ptw32_cond_list_lock);
  return 0;
}

There are the calls to 'EnterCriticalSection' and 'LeaveCriticalSection' with the opposite words 'Enter' and 'Leave' at the beginning and end of the function body. The code in between contains a return statement with a missing call to 'LeaveCriticalSection' before it. This is what the fixed code should look like:

int pthread_cond_destroy(pthread_cond_t * cond)
{ 
  EnterCriticalSection(&ptw32_cond_list_lock);
  /* ... */  
  if (sem_wait (&(cv->semBlockLock)) != 0)
  {
    LeaveCriticalSection(&ptw32_cond_list_lock);
    return errno; 
  }
  /* ... */
  LeaveCriticalSection(&ptw32_cond_list_lock);
  return 0;
}

This diagnostic is classified as:

You can look at examples of errors detected by the V1020 diagnostic.

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