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

LANG.CAST.PC.DCVBASE : Derived Class From Virtual Base

要旨

A pointer to virtual base class is cast to a pointer to a derived class by static_cast or a C-style cast.

プロパティ

クラス名 Derived Class From Virtual Base
日本語クラス名 Derived Class From Virtual Base
クラス分類 信頼性 (reliability)
ニーモニック LANG.CAST.PC.DCVBASE
カテゴリー
Misra2004 Misra2004:11.4 A cast should not be performed between a pointer to object type and a different pointer to object type
AUTOSARC++14 AUTOSARC++14:M5-2-2 A pointer to a virtual base class shall only be cast to a pointer to a derived class by means of dynamic_cast.
  AUTOSARC++14:A5-2-4 reinterpret_cast shall not be used.
MisraC++2008 MisraC++2008:5-2-2 A pointer to a virtual base class shall only be cast to a pointer to a derived class by means of dynamic_cast.
  MisraC++2008:5-2-7 An object with pointer type shall not be converted to an unrelated pointer type, either directly or indirectly.
MisraC++2023 MisraC++2023:8.2.1 A virtual base class shall only be cast to a derived class by means of dynamic_cast
  MisraC++2023:8.2.5 reinterpret_cast shall not be used
CWE CWE:704 Incorrect Type Conversion or Cast
TS17961 TS17961:5.1-ptrcomp Accessing an object through a pointer to an incompatible type
CERT-C CERT-C:EXP36-C Do not cast pointers into more strictly aligned pointer types
JSF++ JSF++:178 Down casting (casting from base to derived class) shall only be allowed through certain mechanisms.
  JSF++:179 A pointer to a virtual base class shall not be converted to a pointer to a derived class.
  JSF++:182 Type casting from any type to or from pointers shall not be used.
  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います。チェックを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 ルールを追加してください。 
WARNING_FILTER += allow class="Derived Class From Virtual Base"

例 

class Base {
  public:
    virtual void polymorphic(void);
};

class Derived : public virtual Base { };

Derived d;
Derived *pD1, *pD2, *pD3;

void virtual_base_cast(void) {
    Base * pB = &d;

    /* These two casts will cause errors in many compilers.
     * We guard the statements with "#ifdef __CODESONAR__ ... #endif" so that they
     * are preprocessed out by the native compiler (so the example can be compiled)
     * but still observed by the CodeSonar analysis.
     */
#ifdef __CODESONAR__
    pD1 = (Derived *)pB;              // 'Derived Class From Virtual Base' warning issued here
    pD2 = static_cast<Derived *>(pB); // 'Derived Class From Virtual Base' warning issued here
#endif
    pD3 = dynamic_cast<Derived *>(pB);                 // ok: not static_cast or C-style cast
}

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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