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V621. Consider inspecting the 'for' ope…
Analyzer Diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
AUTOSAR errors
Additional information
Contents

V621. Consider inspecting the 'for' operator. It's possible that the loop will be executed incorrectly or won't be executed at all.

Jul 03 2012

The analyzer has detected a potential error: odd initial and finite counter values are used in the 'for' operator. It may cause incorrect loop execution and break the program execution logic.

Consider the following example:

signed char i;
for (i = -10; i < 100; i--)
{
  ...
};

Perhaps there is a misprint here causing the initial and finite values to be mixed up. The error may also occur if operators '++' and '--' are mixed up.

This is the correct code:

for (i = -10; i < 100; i++)
{
  ...
};

The following code is also correct:

for (i = 100; i > -10; i--)
{
...
};

Consider the following code sample found by the analyzer in a real application:

void CertificateRequest::Build()
{
    ...
    uint16 authCount = 0;

    for (int j = 0; j < authCount; j++) {
      int sz = REQUEST_HEADER + MIN_DIS_SIZE;
      ...
    }
}

The 'authCount' variable is initialized by an incorrect value or perhaps there is even some other variable to be used here.

This diagnostic is classified as:

You can look at examples of errors detected by the V621 diagnostic.

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