LANG.STRUCT.SE.SWITCH : Too Many Side Effects in Switch

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The controlling expression of a switch statement contains two or more side effects.

Class Name

Too Many Side Effects in Switch

Significance

style

Mnemonic

LANG.STRUCT.SE.SWITCH

Categories

JSF++	JSF++:204	A single operation with side-effects shall only be used in certain contexts.
JPL	JPL:19	Do not use expressions with side effects.

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="Too Many Side Effects in Switch"

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

extern int x, y;
extern int f(int);               /* Functions are assumed to have side effects unless
                                  * SIDE_EFFECT_FREE_FUNCTIONS specifies otherwise */

int too_many_side_effects_switch(void){
    switch (f(x)) {                                      /* only one side effect */
        case 1:
        case 2:
          return 5;
        default:
          ;
    }
    switch (f(y+=10)) { /* 'Too Many Side Effects in Switch' warning issued here */
        case 1:
        case 2:
          return 6;
        default:
          ;
    }
    return 7;
}

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

LANG.STRUCT.SE.SWITCH : Too Many Side Effects in Switch

Summary

Properties

Example

Relevant Configuration File Parameters