LANG.STRUCT.NCO : Nested Conditional Operator

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CodeSonar^® 9.2p0

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C and C++

LANG.STRUCT.NCO : Nested Conditional Operator

Summary

A ternary conditional ?: expression is nested in a larger expression.

Properties

Class Name

Nested Conditional Operator

Significance

style

Mnemonic

LANG.STRUCT.NCO

Categories

AUTOSARC++14	AUTOSARC++14:A5-16-1	The ternary conditional operator shall not be used as a sub-expression.
CWE	CWE:1124	Excessively Deep Nesting

Availability

Available for C and C++.

Enabling

Checks for this warning class are disabled by default, and require the unnormalized C ASTs for the project. To enable them, add the following WARNING_FILTER rule and RETAIN_UNNORMALIZED_C_AST specification to the project configuration file.

RETAIN_UNNORMALIZED_C_AST = Yes
WARNING_FILTER += allow class="Nested Conditional Operator"

Note that retaining the unnormalized ASTs will increase the disk space used to store the project representation, and may make the analysis take longer.

Example

int compute(int, int);

int nested_conditional(int x, int y) {
    int result;
    result = x < 5 ? 2 : 3;                             /* ok: no nesting */
    result += x < 10 ? 2 : 3;                           /* ok: no nesting */
    result = result + (x < 10 ? 2 : 3);        /* 'Nested Conditional Operator' warning issued here
                                                * - Note that this statement has the same semantics as the previous one,
                                                *   but different syntax with nesting on the RHS.
                                                */

    result += (x < 0 ? 0 : (y < 0 ? 1 : x+y)); /* 'Nested Conditional Operator' warning issued here */
    result += compute(x < 0 ? 0 : x,
                      y < 0 ? 0 : x);                   /* ok: function arguments are not considered nested */
    return result;
}

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.

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