Our website uses cookies to enhance your browsing experience.
Accept
to the top
close form

Fill out the form in 2 simple steps below:

Your contact information:

Step 1
Congratulations! This is your promo code!

Desired license type:

Step 2
Team license
Enterprise license
** By clicking this button you agree to our Privacy Policy statement
close form
Request our prices
New License
License Renewal
--Select currency--
USD
EUR
* By clicking this button you agree to our Privacy Policy statement

close form
Free PVS‑Studio license for Microsoft MVP specialists
* By clicking this button you agree to our Privacy Policy statement

close form
To get the licence for your open-source project, please fill out this form
* By clicking this button you agree to our Privacy Policy statement

close form
I am interested to try it on the platforms:
* By clicking this button you agree to our Privacy Policy statement

close form
check circle
Message submitted.

Your message has been sent. We will email you at


If you do not see the email in your inbox, please check if it is filtered to one of the following folders:

  • Promotion
  • Updates
  • Spam

>
>
>
V600. The 'Foo' pointer is always not e…
menu mobile close menu
Analyzer diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Micro-Optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
Customer specific requests (C++)
MISRA errors
AUTOSAR errors
OWASP errors (C++)
OWASP errors (C#)
Problems related to code analyzer
Additional information
toggle menu Contents

V600. The 'Foo' pointer is always not equal to NULL. Consider inspecting the condition.

Jan 18 2012

The analyzer has detected a comparison of an array address to null. This comparison is meaningless and might signal an error in the program.

Consider the following code sample.

void Foo()
{
  short T_IND[8][13];
  ...
  if (T_IND[1][j]==0 && T_IND[5]!=0)
    T_buf[top[0]]= top[1]*T_IND[6][j];
  ...
}

The program handles a two-dimensional array. The code is difficult to read, so the error is not visible at first sight. But the analyzer will warn you that the "T_IND[5]!=0" comparison is meaningless. The pointer "T_IND[5]" is always not equal to zero.

After studying the V600 warnings you may find errors which are usually caused by misprints. For instance, it may turn out that the code above should be written in the following way:

if (T_IND[1][j]==0 && T_IND[5][j]!=0)

The V600 warning doesn't always indicate a real error. Careless refactoring is often the reason for generating the V600 warning. Let's examine the most common case. This is how the code looked at first:

int *p = (int *)malloc(sizeof(int) *ARRAY_SIZE);
...
if (!p)
  return false;
...
free(p);

Then it underwent some changes. It appeared that the ARRAY_SIZE value was small and the array was able to be created on the stack. As a result, we have the following code:

int p[ARRAY_SIZE];
...
if (!p)
  return false;
...

The V600 warning is generated here. But the code is correct. It simply turns out that the "if (!p)" check has become meaningless and can be removed.

This diagnostic is classified as:

You can look at examples of errors detected by the V600 diagnostic.