属性文法第6章
其任务是对语法分析所识别出的各类语法范畴，分析其含义，并进行初步翻译。
　　　　　　包括两个方面的工作。
　　　　　　首先是对各种语法范畴进行静态语义检查，例如，变量是否定义、类型是否正确等等。
　　　　　　如果语义正确，则进行中间代码的翻译。(Sixth chapter of attribute grammar

The task is to analyze all kinds of grammatical categories identified by grammatical analysis, analyze its meaning, and carry out a preliminary translation.

It includes two aspects of work.

The first is to carry out static semantic checks on various grammatical categories, for example, whether variables are defined, type is correct, and so on.

If the semantics are correct, the translation of the intermediate code is performed.)