CERT C:Rule EXP32-C

Do not access a volatile object through a nonvolatile reference

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描述

规则定义

Do not access a volatile object through a nonvolatile reference.¹

Polyspace 实现

规则检查项检查是否存在去除 const 限定符的指针类型转换。

示例

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将类型转换为指针并去除 `volatile` 限定符

问题

Polyspace^® 标记违反此规则的隐式和显式转换。

风险

此规则禁止将指向 volatile 对象的指针转换为不指向 volatile 对象的指针。此类转换违反类型限定。

示例 - 删除限定符的转换

void foo(void) {
    volatile unsigned short *pvi;    /* pointer to volatile  */
    unsigned short          *pi;

    pi  = (unsigned short *)  pvi;   /* Non-compliant */

}

在此示例中，变量 pvi 的类型中包含限定符 volatile。当变量被转换为不具有 volatile 修饰符的类型时，该规则被违反。

检查信息

组：Rule 03. 表达式 (EXP)

版本历史记录

在 R2019a 中推出

另请参阅

检查 SEI CERT-C (-cert-c)

主题

检查并审查编码标准违规

外部网站

EXP32-C

¹ This software has been created by MathWorks incorporating portions of: the “SEI CERT-C Website,” © 2017 Carnegie Mellon University, the SEI CERT-C++ Web site © 2017 Carnegie Mellon University, ”SEI CERT C Coding Standard – Rules for Developing safe, Reliable and Secure systems – 2016 Edition,” © 2016 Carnegie Mellon University, and “SEI CERT C++ Coding Standard – Rules for Developing safe, Reliable and Secure systems in C++ – 2016 Edition” © 2016 Carnegie Mellon University, with special permission from its Software Engineering Institute.

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