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V2587. MISRA. The '//' and '/*' charact…
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
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Contents

V2587. MISRA. The '//' and '/*' character sequences should not appear within comments.

08 Jui 2021

This diagnostic rule is based on the MISRA (Motor Industry Software Reliability Association) software development standard.

This rule applies only to C.

Comments must not contain character sequences that are reserved to indicate a comment's beginning. This is possible if a comment block was not closed with the '*/' sequence or if a block was commented out line-by-line with the '//' sequences.

For example:

/* this comment is not closed
some_critical_function();
/* We're still inside the comment */

In the code above, the first comment block is not closed and the second block of comments is opened inside the first one. In this scenario, crucial code may end up inside comments.

The problem extends to single-line comments as well. For example:

int some_function(int x, int y)
{
    return x // /*
               + y
             // */
            ;
}

A single-line comment takes precedence over the multi-line one. Thus, the resulting expression is the following:

return x + y;

instead of the expected one:

int x = y;

The analyzer does not issue a warning if the '//' sequence is inside a single-line comment:

....
// some_unecessary_call_1(); // probably, should not do this
// some_unecessary_call_2(); // probably, should not do this too
....

In the code above, somebody must have added comments after method calls - and then commented out the entire code block as single-line comments.

This diagnostic is classified as:

  • MISRA-C-3.1
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