LANG.STRUCT.INIT.ICDI : Inconsistent Chained Designator Initialization

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CodeSonar^® 9.2p0

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C and C++

LANG.STRUCT.INIT.ICDI : Inconsistent Chained Designator Initialization

Summary

Some elements of an object are initialized with designators, but some are initialized without designators.

Properties

Class Name

Inconsistent Chained Designator Initialization

Significance

style

Mnemonic

LANG.STRUCT.INIT.ICDI

Categories

MisraC2025	MisraC2025:9.6	An initializer using chained designators shall not contain initializers without designators
MisraC2023	MisraC2023:9.6	An initializer using chained designators shall not contain initializers without designators
Misra2012	Misra2012:9.6	An initializer using chained designators shall not contain initializers without designators
CWE	CWE:665	Improper Initialization

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="Inconsistent Chained Designator Initialization"

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

struct S { int x; int y; };

struct T {
    int w;
    struct S s;
    int z;
};

struct T t1 = { /* 'Inconsistent Chained Designator Initialization' warning issued here
                 * - fields .w and .s.y are initialized without designators
                 * - 'Partially Uninitialized Aggregate' warning also issued if enabled,
                 *    because field .z is not initialized at all
                 */
    1,
    .s.x = 2,
    3,          /* a human reader may assume that this initializes .z but it
                 * actually initializes .s.y, as if the initialization of t1
                 * was written  { 1, { 2, 3 }, 0 }
                 */
};

struct T t2 =  {                      /* ok: all fields initialized with designators */
    .w = 1,
    .s = {2, 3},
    .z = 4,
};

struct T t3 = { 1, {2,3}, 4 };        /* ok: no fields initialized without designators */

Relevant Configuration File Parameters

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

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