loop.java

myassembler（大学作业）

public class Loop extends Statement {
   private Expression condition;
   private Statement body;
   String operazione;
   int valore;

   public Loop(Expression c, Statement s) {
      body = (Statement)s.clone();
      condition = (Expression)c.clone();
   }

   public void run() throws ExecutionException {
      while (condition.eval() == 1) body.run();
   }

   public Object clone() {
      return new Loop(condition, body);
   }

   /* --------------------------------------- 
    * lj: condition
    *     jzero li
    *     body
    *     jump lj
    * li: ...
    */
   public String toString() {
      int truelabel = ++labels, falselabel = ++labels;
      toLabel = truelabel;
      String result = condition.toString()+labelling()+"JZERO L"+falselabel+"\n"+body.toString()+labelling()+"JUMP L"+truelabel+"\n";
      toLabel = falselabel;
      return result;
   }
}