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Package <Unnamed>
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<TD WIDTH="15%"><B><A HREF="Err.html" title="class in <Unnamed>">Err</A></B></TD>
<TD>这个类只是包含了报错函数以及错误计数器。</TD>
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<TD WIDTH="15%"><B><A HREF="Instr.html" title="class in <Unnamed>">Instr</A></B></TD>
<TD>这个类对应C语言版本中的 fct 枚举类型和 instruction 结构，代表虚拟机指令</TD>
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<TD WIDTH="15%"><B><A HREF="Interpreter.html" title="class in <Unnamed>">Interpreter</A></B></TD>
<TD>类P-Code代码解释器（含代码生成函数），这个类包含了C语言版中两个重要的全局变量 cx 和 code</TD>
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<TD WIDTH="15%"><B><A HREF="Parser.html" title="class in <Unnamed>">Parser</A></B></TD>
<TD>语法分析器。</TD>
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<TD WIDTH="15%"><B><A HREF="PL0.html" title="class in <Unnamed>">PL0</A></B></TD>
<TD>这个版本的 PL/0 编译器根据 C 语言的版本改写而成。</TD>
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<TD WIDTH="15%"><B><A HREF="Scanner.html" title="class in <Unnamed>">Scanner</A></B></TD>
<TD>词法分析器负责的工作是从源代码里面读取文法符号，这是PL/0编译器的主要组成部分之一。</TD>
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<TD WIDTH="15%"><B><A HREF="Symbol.html" title="class in <Unnamed>">Symbol</A></B></TD>
<TD>C语言版本中采用全局变量sym来存储符号码，并用全局变量id和num来传递语义值。</TD>
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<TD WIDTH="15%"><B><A HREF="Table.html" title="class in <Unnamed>">Table</A></B></TD>
<TD>这个类封装了PL/0编译器的符号表，C语言版本中关键的全局变量tx和table[]就在这里。</TD>
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