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Interpreter
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SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
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Class Interpreter</H2>
<PRE>
java.lang.Object
<IMG SRC="./resources/inherit.gif" ALT="extended by "><B>Interpreter</B>
</PRE>
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<DL>
<DT><PRE>public class <B>Interpreter</B><DT>extends java.lang.Object</DL>
</PRE>
<P>
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
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<B>Field Summary</B></FONT></TH>
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<CODE> <A HREF="Instr.html" title="class in <Unnamed>">Instr</A>[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="Interpreter.html#code">code</A></B></CODE>
<BR>
存放虚拟机代码的数组</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Interpreter.html#cx">cx</A></B></CODE>
<BR>
虚拟机代码指针，取值范围[0, cxmax-1]</TD>
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<CODE>(package private) int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Interpreter.html#stacksize">stacksize</A></B></CODE>
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<TD><CODE><B><A HREF="Interpreter.html#Interpreter()">Interpreter</A></B>()</CODE>
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<CODE>private int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Interpreter.html#base(int, int[], int)">base</A></B>(int l,
int[] s,
int b)</CODE>
<BR>
通过给定的层次差来获得该层的堆栈帧基地址</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="Interpreter.html#gen(int, int, int)">gen</A></B>(int x,
int y,
int z)</CODE>
<BR>
生成虚拟机代码</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="Interpreter.html#interpret()">interpret</A></B>()</CODE>
<BR>
解释程序</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="Interpreter.html#listcode(int)">listcode</A></B>(int start)</CODE>
<BR>
输出目标代码清单</TD>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<A NAME="stacksize"><!-- --></A><H3>
stacksize</H3>
<PRE>
final int <B>stacksize</B></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="constant-values.html#Interpreter.stacksize">Constant Field Values</A></DL>
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<HR>
<A NAME="cx"><!-- --></A><H3>
cx</H3>
<PRE>
public int <B>cx</B></PRE>
<DL>
<DD>虚拟机代码指针，取值范围[0, cxmax-1]
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<DL>
</DL>
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<A NAME="code"><!-- --></A><H3>
code</H3>
<PRE>
public <A HREF="Instr.html" title="class in <Unnamed>">Instr</A>[] <B>code</B></PRE>
<DL>
<DD>存放虚拟机代码的数组
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<DL>
</DL>
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<A NAME="Interpreter()"><!-- --></A><H3>
Interpreter</H3>
<PRE>
public <B>Interpreter</B>()</PRE>
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<A NAME="gen(int, int, int)"><!-- --></A><H3>
gen</H3>
<PRE>
public void <B>gen</B>(int x,
int y,
int z)</PRE>
<DL>
<DD>生成虚拟机代码
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>x</CODE> - instruction.f<DD><CODE>y</CODE> - instruction.l<DD><CODE>z</CODE> - instruction.a</DL>
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<A NAME="listcode(int)"><!-- --></A><H3>
listcode</H3>
<PRE>
public void <B>listcode</B>(int start)</PRE>
<DL>
<DD>输出目标代码清单
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>start</CODE> - 开始输出的位置</DL>
</DD>
</DL>
<HR>
<A NAME="interpret()"><!-- --></A><H3>
interpret</H3>
<PRE>
public void <B>interpret</B>()</PRE>
<DL>
<DD>解释程序
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="base(int, int[], int)"><!-- --></A><H3>
base</H3>
<PRE>
private int <B>base</B>(int l,
int[] s,
int b)</PRE>
<DL>
<DD>通过给定的层次差来获得该层的堆栈帧基地址
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>l</CODE> - 目标层次与当前层次的层次差<DD><CODE>s</CODE> - 运行栈<DD><CODE>b</CODE> - 当前层堆栈帧基地址
<DT><B>Returns:</B><DD>目标层次的堆栈帧基地址</DL>
</DD>
</DL>
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