JavaScript is not currently enabled, but is required for full CodeSonar manual search and browse functionality.

If you are viewing this file in your hub's Web GUI, enable JavaScript in your browser: you will also need it for GUI functionality.

If you opened this file directly from disk, your browser may be directly suppressing JavaScript functionality: certain browsers perform this suppression on local files (but not files delivered by web servers) for security reasons.

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


LANG.TYPE.CGEN.IMPTC : Implicit Pointer Type Conversion in Selection of C Generic

要旨

The default association for a C generic selection expression is selected, but a human reader might expect a different outcome if they (mistakenly) believe that implicit pointer conversion will take place.

The controlling expression of a C generic selection undergoes lvalue conversion, but does not undergo implicit pointer conversion. Once lvalue conversion has taken place, the controlling expression type must exactly match an association type in the association list in order for that association to be selected: otherwise, the default association is selected.

プロパティ

クラス名 Implicit Pointer Type Conversion in Selection of C Generic
日本語クラス名 Implicit Pointer Type Conversion in Selection of C Generic
クラス分類 スタイル (style)
ニーモニック LANG.TYPE.CGEN.IMPTC
カテゴリー
MisraC2025 MisraC2025:23.5 A generic selection should not depend on implicit pointer type conversion
MisraC2023 MisraC2023:23.5 A generic selection should not depend on implicit pointer type conversion
Misra2012 Misra2012:23.5 A generic selection should not depend on implicit pointer type conversion
対応言語 C のみ利用可能です。 C++ は利用できません。
有効/無効設定 このワーニングクラスのチェックはデフォルトで無効になっており、プロジェクトには非正規の C向けAST が必要になります。有効にするにはプロジェクト設定ファイル (configuration file) に以下の WARNING_FILTER ルールと RETAIN_UNNORMALIZED_C_AST 設定を追加してください。
RETAIN_UNNORMALIZED_C_AST = Yes
WARNING_FILTER += allow class="Implicit Pointer Type Conversion in Selection of C Generic"
注:非正規化された AST を継続して使用した場合、使用ディスク容量が増加し解析時間が長くなる可能性があります。

#define QUALINT_PTRS(y) (_Generic(y,                \
                                  const int*: 0,    \
                                  volatile int*: 1, \
                                  default: -1))

#define INT_PTR(y) (_Generic(y,          \
                             int*: 0,    \
                             default: -1))

int lang_type_cgen_imptc(int *pi, void *pv, float *pf){
    int rv = 0;
    rv += QUALINT_PTRS(pi); /* 'Implicit Pointer Type Conversion in Selection of C Generic' warning issued here
                             * - selection type int* does not match any non-default association type {const int*, volatile int*},
                             *   but author/reader might have expected otherwise.
                             */
    rv += INT_PTR(pi);                        /* ok: selection type int* matches int* association type */
    rv += INT_PTR(pv);      /* 'Implicit Pointer Type Conversion in Selection of C Generic' warning issued here
                             * - selection type int* does not match any non-default association type {void*},
                             *   but author/reader might have expected otherwise.
                             */
    rv += INT_PTR(pf);                        /* ok: selection type int* does not match non-default association type float*, but
                                               * this is not likely to reflect (or cause) confusion about implicit conversion.
                                               */
    return rv;
}

関連のある設定ファイルパラメータ

設定ファイルの以下のパラメータがこのワーニングクラスのチェックに影響します。

 

To report problems with this documentation, please visit https://support.codesecure.com/.