constant.java

来自「A compiler for a subset of the Java lang」· Java 代码 · 共 35 行

package inter;
import lexer.*; import symbols.*;

public class Constant extends Expr {

   public Constant(Token tok, Type p) { super(tok, p); }
   public Constant(int i) { super(new Num(i), Type.Int); }

   public static final Constant
      True  = new Constant(Word.True,  Type.Bool),
      False = new Constant(Word.False, Type.Bool);

   public void jumping(int t, int f) {
      if ( this == True && t != 0 ) emit("goto L" + t);
      else if ( this == False && f != 0) emit("goto L" + f);
   }
   
   public String toString()
   {
	   if(type == Type.Int)
	   {
		   return "ldc " + ((Num)op).value + "\n";
	   }
	   else if(type == Type.Float)
	   {
		   return "ldc " + ((Real) op).value + "\n";   
	   }
	   else if(type == Type.Complex)
	   {
		   return "ldc 0.0\nldc " + ((Complex) op).iValue + "\n";
	   }
	   return "nop\n";
   }
}