LANG.CAST.PC.PV : Conversion: Void Pointer to Object

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LANG.CAST.PC.PV : Conversion: Void Pointer to Object Pointer

A pointer to void is cast or coerced to a pointer to object.

Exception: casting or coercing a null pointer constant (such as NULL) to pointer to object will not trigger a warning of this class.

Class Name

Conversion: Void Pointer to Object Pointer

Significance

style

Mnemonic

LANG.CAST.PC.PV

Categories

MisraC2023	MisraC2023:11.5	A conversion should not be performed from pointer to void into pointer to object
Misra2012	Misra2012:11.5	A conversion should not be performed from pointer to void into pointer to object
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
AUTOSARC++14	AUTOSARC++14:M5-2-8	An object with integer type or pointer to void type shall not be converted to an object with pointer type.
MisraC++2008	MisraC++2008:5-2-7	An object with pointer type shall not be converted to an unrelated pointer type, either directly or indirectly.
	MisraC++2008:5-2-8	An object with integer type or pointer to void type shall not be converted to an object with pointer type.
MisraC++2023	MisraC++2023:8.2.6	An object with integral, enumerated, or pointer to void type shall not be converted to an object with pointer type
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
	TS17961:5.6-argcomp	5.6. Calling functions with incorrect arguments
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="Conversion: Void Pointer to 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.

#include <stddef.h>

void use_pointers(int *p1, int *p2);

void PC_PV(void *v){
    int *i;
    int *j;

    i = (int *) v;        /* 'Conversion: Void Pointer to Object Pointer' warning issued here */
    j = (int *) NULL;                  /* specific exception */
    
    use_pointers(i,j);
}

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

LANG.CAST.PC.PV : Conversion: Void Pointer to Object Pointer

Summary

Properties

Example

Relevant Configuration File Parameters