LANG.CAST.PC.AO : Cast: Non-integer Arithmetic Type/Object Pointer

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A cast between a pointer to object and one of the following types (as defined by the MISRA C 2012 standard): 'essentially Boolean', 'essentially character', 'essentially enum', 'essentially floating'.

Class Name

Cast: Non-integer Arithmetic Type/Object Pointer

Significance

reliability

Mnemonic

LANG.CAST.PC.AO

Categories

MisraC2023	MisraC2023:11.7	A cast shall not be performed between pointer to object and a non-integer arithmetic type
Misra2012	Misra2012:11.7	A cast shall not be performed between pointer to object and a non-integer arithmetic type
Misra2004	Misra2004:11.2	Conversions shall not be performed between a pointer to object and any type other than an integral type, another pointer to object type or a pointer to void
CWE	CWE:704	Incorrect Type Conversion or Cast
TS17961	TS17961:5.1-ptrcomp	5.1. Accessing an object through a pointer to an incompatible type
JSF++	JSF++:182	Type casting from any type to or from pointers shall not be used.
	JSF++:183	Every possible measure should be taken to avoid type casting.

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="Cast: Non-integer Arithmetic Type/Object Pointer"

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

void use_pointers(int* x, int *y);
void use_chars(char a, char b);

void PC_AtoO(char c){
    int *pi = (int *)c; /* 'Cast: Non-integer Arithmetic Type/Object Pointer' warning issued here */
    int *cpi = c;              /* not a cast */
    use_pointers(pi, cpi);
}

void PC_OtoA(int *pi){
    char c = (char) pi; /* 'Cast: Non-integer Arithmetic Type/Object Pointer' warning issued here */
    char cc = pi;              /* not a cast */
    use_chars(c, cc);
}

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

LANG.CAST.PC.AO : Cast: Non-integer Arithmetic Type/Object Pointer

Summary

Properties

Example

Relevant Configuration File Parameters