seq.java

来自「23种设计模式JAVA实现,很好很有用的东西.」· Java 代码 · 共 20 行

package inter;

public class Seq extends Stmt {

   Stmt stmt1; Stmt stmt2;

   public Seq(Stmt s1, Stmt s2) { stmt1 = s1; stmt2 = s2; }

   public void gen(int b, int a) {
      if ( stmt1 == Stmt.Null ) stmt2.gen(b, a);
      else if ( stmt2 == Stmt.Null ) stmt1.gen(b, a);
      else {
         int label = newlabel();
         stmt1.gen(b,label);
         emitlabel(label);
         stmt2.gen(label,a);
      }
   }
}