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CodeSonar® 9.2p0 CONFIDENTIAL CodeSecure Inc
C and C++

CONCURRENCY.C_ATOMIC.DAF : Direct Access to Field of C Atomic Object

Summary

An expression directly accesses a field of an atomic object of struct or union type.

Properties

Class Name Direct Access to Field of C Atomic Object
Significance reliability
Mnemonic CONCURRENCY.C_ATOMIC.DAF
Categories
MisraC2025 MisraC2025:12.6 Structure and union members of atomic objects shall not be directly accessed
MisraC2023 MisraC2023:12.6 Structure and union members of atomic objects shall not be directly accessed
Misra2012 Misra2012:12.6 Structure and union members of atomic objects shall not be directly accessed
Availability Available for C only (not C++).
Enabling Checks for this warning class are enabled by default. However, warning instances of this class that are issued as parser errors (rather than parser warnings) will be discarded when using factory configuration settings. To prevent these instances from being discarded, add the following WARNING_FILTER rule to the project configuration file. 
WARNING_FILTER += allow class="Direct Access to Field of C Atomic Object"
To disable checks for this warning class, add the following WARNING_FILTER rule to the project configuration file. 
WARNING_FILTER += discard class="Direct Access to Field of C Atomic Object"

Example 

#include <stdatomic.h>

typedef struct {
    int x;
} ss_t;

void atomic_daf(ss_t *nonatomic, _Atomic ss_t *atomicA, _Atomic ss_t *atomicB){
    atomicA->x = 0; /* 'Direct Access to Field of C Atomic Object' warning issued here */
    nonatomic->x = 0;                   /* ok: not an atomic object */
    atomic_store(atomicB, *nonatomic);  /* ok: not a direct field access */
}

Relevant Configuration File Parameters

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

 

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