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V3021. There are two 'if' statements wi…
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

V3021. There are two 'if' statements with identical conditional expressions. The first 'if' statement contains method return. This means that the second 'if' statement is senseless.

Nov 12 2015

The analyzer has detected an issue when the 'then' part of the 'if' operator never gets control. It happens because there is another 'if' before which contains the same condition whose 'then' part contains the unconditional 'return' operator. It may signal both a logical error in the program and an unnecessary second 'if' operator.

Consider the following example of incorrect code:

if (l >= 0x06C0 && l <= 0x06CE) return true;
if (l >= 0x06D0 && l <= 0x06D3) return true;
if (l == 0x06D5) return true;                 // <=
if (l >= 0x06E5 && l <= 0x06E6) return true;
if (l >= 0x0905 && l <= 0x0939) return true;
if (l == 0x06D5) return true;                 // <=
if (l >= 0x0958 && l <= 0x0961) return true;
if (l >= 0x0985 && l <= 0x098C) return true;

In this case, the 'l == 0x06D5' condition is doubled, and we just need to remove one of them to fix the code. However, it may be that the value being checked in the second case should be different from the first one.

This is the fixed code:

if (l >= 0x06C0 && l <= 0x06CE) return true;
if (l >= 0x06D0 && l <= 0x06D3) return true;
if (l == 0x06D5) return true;
if (l >= 0x06E5 && l <= 0x06E6) return true;
if (l >= 0x0905 && l <= 0x0939) return true;
if (l >= 0x0958 && l <= 0x0961) return true;
if (l >= 0x0985 && l <= 0x098C) return true;

This diagnostic is classified as:

You can look at examples of errors detected by the V3021 diagnostic.

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