在编译的哪个步骤中删除注释? [英] In which step of compilation are comments removed?

问题描述

编译一个程序有几个步骤:

• 线重建
• 词法分析
• 预处理.
• 语法分析
• 语义分析

第一步去除评论是线路重构"吗?

Is removal of comments in the first step "line reconstruction"?

推荐答案

• 预处理是它自己的一个阶段，它有自己的扫描和解析，先于词法分析.
• 我是一名编译器作家，我从未听说过行重建".编译器不处理行:它们处理令牌流.您的引文特别指出，这是一些奇怪语言的特例.
• 您忽略了流程分析、优化、寄存器分配和代码生成等.
• 在词法分析过程中，评论被忽略，而不是被删除，有时在概念上将其描述为筛选"和扫描"，在这种情况下，您可以说评论被筛选掉，就像空格一样.
• Preprocessing is a phase of its own with its own scanning and parsing, which precede lexical analysis.
• I'm a compiler writer and I've never heard of 'line reconstruction'. Compilers don't process lines: they process token streams. Your citation specifically says this is a special case for a few odd languages.
• You've left out flow analysis, optimization, register allocation, and code generation, and a few more.
• Comments are ignored, not removed, during lexical analysis, which is sometimes conceptually described as 'screening' and 'scanning', in which case you can say comments are screened out, like white space.

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