Dragon Book reading notes 1

saintony

于 2011-07-19 14:50:25 发布

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分类专栏： Basics & Theories 文章标签： compiler optimization algorithm tree regex input

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本文深入探讨了现代编译器设计的核心组成部分——词法解析和优化过程。从输入到语法树形成，再到利用DFA进行优化，作者详细解释了这些步骤如何创新地实现编译器的高效运行。

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This note is on the intro. and lexical parts.

Since I studied my compiler course pretty well (I think), the first 2 chapters look some familiar. Well yea, the backend is always the hotspot of modern compiler design. Sb. said to me years ago, that after Knuth invented his grammar analysis algorithm (I forgot the name when I typing this..), the front end research was finalized. maybe, who knows..

First component of a compiler, lexical parser, elaborated in chapter 3, consists of a complete automata. In this chapter, the regex is the input of a lexical analyzer, then a syntax tree is formed, and a DFA will derives from this tree – this step sounds quite innovative to me. then the optimization algo. on a NFA is introduced – grouping the “important” nodes in a NFA.