Skip to main content

IAR Embedded Workbench for RH850 3.20.x

CERT-EXP39-C_d

In this section:
Synopsis

Do not access a variable through a pointer of an incompatible type.

Enabled by default

Yes

Severity/Certainty

Medium/Low

mediumlow.png
Full description

Modifying a variable through a pointer of an incompatible type (other than unsigned char) can lead to unpredictable results. This check is identical to MISRAC2012-Rule-11.3.

Coding standards
CERT EXP39-C

Do not access a variable through a pointer of an incompatible type

MISRA C:2012 Rule-11.3

(Required) A cast shall not be performed between a pointer to object type and a pointer to a different object type

Code examples

The following code example fails the check and will give a warning:

typedef unsigned int uint32_t;
typedef unsigned char uint8_t;

void example(void) {
	uint8_t * p1;
	uint32_t * p2;
	p2 = (uint32_t *)p1;
}

The following code example passes the check and will not give a warning about this issue:

typedef unsigned int uint32_t;
typedef unsigned char uint8_t;

void example(void) {
	uint8_t * p1;
	uint8_t * p2;
	p2 = (uint8_t *)p1;
}