LCC编译器的源程序分析(63)创建DAG森林的源程序

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#001//

#002void walk(Tree tp, int tlab, int flab)

#003{

#004//创建DAG森林.

#005listnodes(tp, tlab, flab);

#006

#007//如果DAG森林生成.

#008if (forest)

#009{

#010 Node list = forest->link;

#011 forest->link = NULL;

#012

#013 //把多次引用的DAG节点,修改为对临时变量的引用.

#014 if (!IR->wants_dag && errcnt == 0)

#015 {

#016 list = undag(list);

#017 }

#018

#019 //创建代码块保存DAG的列表.

#020 AppendCode(code::Gen)->u.forest = list;

#021 forest = NULL;

#022}

#023

#024reset();

#025deallocate(STMT);

#026}

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