LANG.CAST.PC.OBJ : Cast: Object Pointers

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CodeSonar^® 9.2p0

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C and C++

LANG.CAST.PC.OBJ : Cast: Object Pointers

Summary

A pointer to object is cast to a pointer to a different object type.

Exception: casting a pointer to object to pointer to char, signed char, or unsigned char will not trigger a warning of this class.

Properties

Class Name

Cast: Object Pointers

Significance

style

Mnemonic

LANG.CAST.PC.OBJ

Categories

MisraC2025	MisraC2025:11.3	A conversion shall not be performed between a pointer to object type and a pointer to a different object type
MisraC2023	MisraC2023:11.3	A conversion shall not be performed between a pointer to object type and a pointer to a different object type
Misra2012	Misra2012:11.3	A conversion shall not be performed between a pointer to object type and a pointer to a different object type
Misra2004	Misra2004:11.4	A cast should not be performed between a pointer to object type and a different pointer to object 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.
CWE	CWE:704	Incorrect Type Conversion or Cast
TS17961	TS17961:5.1-ptrcomp	Accessing an object through a pointer to an incompatible type
CERT-C	CERT-C:EXP36-C	Do not cast pointers into more strictly aligned pointer types
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: Object Pointers"

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

void use_pointers(int *x, int *y, char *z);

void PC_OBJ(short *s){
    int *i = s;                                /* not a cast ('Bad Initializer Type' warning issued) */
    int *j = (int *) s; /* 'Cast: Object Pointers' warning issued here */
    char *c = (char *) s;                      /* specific exception */
    use_pointers(i,j,c);
}

Relevant Configuration File Parameters

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

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