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View Code? Open in Web Editor NEW学习编译原理, 做一些记录
License: MIT License
学习编译原理, 做一些记录
License: MIT License
摘抄于一张 Compiler Construction: Principles and Practice 里的流程图
Source Code 源码
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Scanner 代码扫描器, 读入代码
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Tokens 输出一个个词
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Parser解析每个词
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Syntax Tree 生成语法分析树
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Semantic Analyzer 语义分析
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Annotated Tree 带语义注释的树
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Source Code Optimizer 源码优化器
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Intermediate Code 中间代码
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Code Genrator 代码生成器
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Target Code 目标代码
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Target Code Optimizer 目标代码优化器
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Target Code 目标代码
看Compiler Construction Principles and Practice, 在第131页底部, 感觉言简意赅
We have been using the term context-free without explaining why such rules are in fact "free of context." The simple reason is that nonterminals appear by themselves to the left of the arrow in context-free rules. Thus a rule A->α says that A may be replaced by α anywhere, regardless of where the A occurs.
我们已经用了词: 上下文无关, 而没有解释为什么这样的规则事实上就是"和上下文没有关系的". 简单的理由是: 非终结符自身在上下文无关规则的箭头左边.
于是, 若有一条规则: A->α, 则意味着A可能会在任何地方被α替换, 无论A在什么位置出现.
平时说话经常会用代词指代东西, 代词就是上下文有关的, 不然无法判断其指代, 而某个名字往往就是上下文无关的, 这个名字直接被理解为其对应的事物
比如: 那个男人, 可以有多个理解, 需要上下文, 而书就明确被大脑接收并替换为"书"这种东西
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