LANG.STRUCT.FNADDR : Implicit Address of Function

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An expression implicitly takes the address of a function (without using the & operator).

Class Name

Implicit Address of Function

Significance

style

Mnemonic

LANG.STRUCT.FNADDR

Categories

MisraC2023	MisraC2023:17.12	A function identifier should only be used with either a preceding &, or with a parenthesized parameter list
Misra2012	Misra2012:17.12	A function identifier should only be used with either a preceding &, or with a parenthesized parameter list
Misra2004	Misra2004:16.9	A function identifier shall only be used with either a preceding &, or with a parenthesised parameter list, which may be empty
AUTOSARC++14	AUTOSARC++14:M8-4-4	A function identifier shall either be used to call the function or it shall be preceded by &.
MisraC++2008	MisraC++2008:8-4-4	A function identifier shall either be used to call the function or it shall be preceded by &.

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="Implicit Address of Function"

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

typedef void (*ftype)(void);
void callfn(ftype fin);
void f(void);

int lang_struct_fnaddr(void){
    int rv = 0;
    if (f) {rv = 1;}   /* 'Implicit Address of Function' warning issued here */
    f;                 /* 'Implicit Address of Function' warning issued here */
    callfn(f);         /* 'Implicit Address of Function' warning issued here */

    f();                                                      /* normal function call */
    callfn(&f);                                               /* explicit addressing */
    return rv;
}

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

LANG.STRUCT.FNADDR : Implicit Address of Function

Summary

Properties

Example

Relevant Configuration File Parameters