“死代码"与“死代码"之间有什么区别?和“无法访问的代码"?

问题描述

我认为这些术语是同义词，但是MISRA中有关无效代码的注释表明这是错误的?有什么不同?一个是另一个的子集吗?

I thought those terms where synonymous, but a note in MISRA regarding dead code indicates this to be wrong? What's the difference? Is one a subset of the other?

推荐答案

无效代码-已执行但冗余的代码，要么从不使用结果，要么不向程序的其余部分添加任何内容.浪费CPU性能.

Dead code - code that is executed but redundant, either the results were never used or adds nothing to the rest of the program. Wastes CPU performance.

function(){
    // dead code since it's calculated but not saved or used anywhere
    a + b;
}

无法访问的代码-不管逻辑流程如何，都永远不会到达的代码.区别在于它没有执行.

Unreachable code - code that will never be reached regardless of logic flow. Difference is it's not executed.

function(){
    return x;

    // unreachable since returned
    a = b + c;
}

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