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


LANG.CAST.REINTERPRET : Cast: reinterpret_cast

要旨

A use of reinterpret_cast, which can lead to undefined behavior.

The following will not trigger a warning of this class, because their behavior is well defined.

Exception case 1 reinterpret_cast<T *>(p)
where
  • p is a pointer, and
  • T is one of {void, char, unsigned char, std::byte}, possibly cv-qualified.
Exception case 2 reinterpret_cast<T>(p)
where
  • p is a pointer, and
  • T is an integer type long enough to represent a pointer value.

プロパティ

クラス名 Cast: reinterpret_cast
日本語クラス名 Cast: reinterpret_cast
クラス分類 スタイル (style)
ニーモニック LANG.CAST.REINTERPRET
カテゴリー
AUTOSARC++14 AUTOSARC++14:A5-2-4 reinterpret_cast shall not be used.
MisraC++2023 MisraC++2023:8.2.5 reinterpret_cast shall not be used
CWE CWE:704 Incorrect Type Conversion or Cast
JSF++ JSF++:183 Every possible measure should be taken to avoid type casting.
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="Cast: reinterpret_cast"
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。

#include <cstdint>

class Base {
};

class Derived : public Base {
};

void reinterpret_cast_examples(Base *b, float *f, char c)
{
    reinterpret_cast<int *>(f);       // 'Cast: reinterpret_cast' warning issued here
    reinterpret_cast<Derived *>(b);   // 'Cast: reinterpret_cast' warning issued here;
                                      // use static_cast instead

    reinterpret_cast<void *>(b);                     // ok: casting a pointer to void*
                                                     //     (exception case 1)
    reinterpret_cast<void *>(c);      // 'Cast: reinterpret_cast' warning issued here
                                      // - exception case 1 applies only when casting a pointer

    reinterpret_cast<std::uintptr_t>(b);             // ok: casting a pointer to an integer type
                                                     //     large enough represent a pointer value
                                                     //     (exception case 2)

    // Exception case 2 applies only when casting a pointer.
    // The following reinterpret_cast expression is commented out
    // because it typically causes a parse error instead of triggering a warning.
    // reinterpret_cast<std::uintptr_t>(c);
}

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。

 

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