LANG.STRUCT.SE.STMT : Too Many Side Effects in Statement

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CodeSonar^® 9.2p0

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CodeSecure Inc

C and C++

LANG.STRUCT.SE.STMT : Too Many Side Effects in Statement

Summary

An expression statement contains two or more side effects.

There are two kinds of expression statement that will not trigger warnings of this class.

An expression statement that consists only of a single function call (see Too Many Side Effects in Function Call).
An expression statement that contains one or more comma operators.

Properties

Class Name

Too Many Side Effects in Statement

Significance

style

Mnemonic

LANG.STRUCT.SE.STMT

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 Statement"

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

extern int x, y;
extern int f(int);                             /* Functions are assumed to have side effects unless
                                                * SIDE_EFFECT_FREE_FUNCTIONS specifies otherwise */
extern int g(int, int);
void too_many_side_effects_statement(void){
    x++;                                                    /* only one side effect */
    x--, y--;                                               /* contains comma operator */
    x++ + y++;         /* 'Too Many Side Effects in Statement' warning issued here */
    f(x) + f(y);       /* 'Too Many Side Effects in Statement' warning issued here */
    g(x+=2, y+=4) + 2; /* 'Too Many Side Effects in Statement' warning issued here
                        * ('Too Many Side Effects in Function Call' warning also issued if enabled) */
    g(x+=3, y+=5);                                         /* consists only of a single function call
                                                            * ('Too Many Side Effects in Function Call'
                                                            *  warning issued if enabled) */
}

Relevant Configuration File Parameters

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

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