9.5.3_e4.htm

来自「建立《编译原理网络课程》的目的不仅使学生掌握构造编译程序的原理和技术」· HTM 代码 · 共 41 行

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<p>
<img border="0" src="images/9_25_4.gif" align = left width="336" height="122">图2(d)中的分支语句产生的定值集合是什么?<p>
解析:简单地说,循环不影响gen和kill。如果定值d由S1产生,那么S1和S的结束点它都能到达。反过来,如果定值d由S产生,那么它肯定由S1产生。所以我们认为:
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<p>&nbsp;&nbsp;&nbsp;&nbsp;<span style="FONT-SIZE: large">gen[S]= gen[S1]</span></td>
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