set.java

来自「A compiler for a subset of the Java lang」· Java 代码 · 共 37 行

package inter;
import symbols.*;

public class Set extends Stmt {

   public Id id; public Expr expr;

   public Set(Id i, Expr x) {
      id = i; expr = x;
      if ( check(id.type, expr.type) == null ) error("type error");
   }

   public Type check(Type p1, Type p2) {
      if ( Type.numeric(p1) && Type.numeric(p2) ) return p2;
      else if ( p1 == Type.Bool && p2 == Type.Bool ) return p2;
      else return null;
   }

   public void gen(int b, int a) {
      //emit( id.toString() + " = " + expr.gen().toString() );
	  emit(expr.gen().toString());
	  if(expr.type == Type.Int)
	  {
		  emit("istore " + id.lvaIdx + "\n");
	  }
	  else if(expr.type == Type.Float)
	  {
		  emit("fstore " + id.lvaIdx + "\n");
	  }
	  else if(expr.type == Type.Complex)
	  {
		  emit("fstore " + (id.lvaIdx + 4) + "\n");
    	  emit("fstore " + id.lvaIdx + "\n");
	  }
   }
}