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| CodeSonar® 9.0p0 Hot Tips | CONFIDENTIAL | CodeSecure Inc |
A power function is called with zero in the "base" argument position and zero or a negative value in the "exponent" argument position.
| Class Name | Undefined Power of Zero | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Significance | reliability | ||||||||||||||||||||||||
| Mnemonic | MATH.DOMAIN.POW | ||||||||||||||||||||||||
| Categories |
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| Availability | Available for C and C++. |
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| Enabling | Checks for this warning class are enabled by
default. To disable them, add the following WARNING_FILTER rule to the
project configuration file.
WARNING_FILTER += discard class="Undefined Power of Zero" |
CodeSonar ships with library models that allow it to recognize functions such as libm pow() that compute a power. If one of these functions is called with zero in the "base" parameter position and zero or a negative value in the "power" parameter position, a warning will be issued.
If you have created a custom library model for some function f() in terms of one of these existing models, calls to f() will also be capable of triggering Undefined Power of Zero warnings.
Japanese (ja)
#include <math.h>
double call_pow(double base, double exp){
double a = pow(1,1); /* ok: base and exponent both > 0 */
double b = pow(0,5); /* ok: exponent > 0 */
double c = pow(0,-1); /* 'Undefined Power of Zero' warning issued here */
double d = pow(base,-1); /* EVIDENCED ONLY: 'Undefined Power of Zero' warning issued here
* if CodeSonar has evidence that call_pow() is called with a value ==0 as the first argument. */
double e = pow(0,exp); /* 'Undefined Power of Zero' warning issued here */
double f = pow(base,exp); /* EVIDENCED ONLY: 'Undefined Power of Zero' warning issued here
* if CodeSonar has evidence that call_pow() is called with a value ==0 as the first argument. */
return a+b+c+d+e+f;
}
The following configuration file parameters affect checks for this warning class.