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V3509. AUTOSAR. Unions should not be us…
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
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Contents

V3509. AUTOSAR. Unions should not be used.

03 Mar 2021

This diagnostic rule is based on the software development guidelines developed by AUTOSAR (AUTomotive Open System ARchitecture).

The analyzer issues the warning when it detects a union declaration.

Incorrect use of unions may cause various problems, such as reading incorrect values or undefined behavior.

For example, undefined behavior occurs when attempting to read from a member other than the one that the latest write operation was performed on.

Here is an example of code triggering this warning:

union U
{
  unsigned char uch;
  unsigned int ui;
} uni;
....
uni.uch = 'w';
int ui = uni.ui;

This diagnostic is classified as:

  • AUTOSAR-M9.5.1
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