dhalf.java

用Java实现的编译器。把源代码编译成SPARC汇编程序

// $Id: dHalf.java,v 1.3 2000/10/21 23:18:13 mdeeds Exp $

package java6035.tools.ASM;

/**
 * dHalf
 *
 * represents an .half directive in ASM file. ".half h1, ..., hn" stores
 * the n 16-bit quantities in successive memory words. Each value must fit 
 * into the 16 bit width
 */

public class dHalf extends ASMDirective
{
    protected Object[] entries;

    /**
     * constructs a dHalf object of the size given. Elements are
     * initialized to 0, and will be filled in later.
     */
    public dHalf(int size)
    {
		super(ASMDirective.HALF);
		this.entries = new Object[size];
		for(int i=0; i<size; i++) {
		    this.entries[i] = new Long(0);
		}
    }


    /**
     * Returns the nth element of the dHalf object.
     */
    public Object elementAt(int n)
    {
		return this.entries[n];
    }


    /**
     * Replaces the @param n th element of the dHalf object with new
     * value, @param s.  @param n = 0 specifies the first element.
     **/
    public void setElementAt(int n, String s)
    {
		this.entries[n] = s;
    }

    
    /**
     * Replaces the @param n th element of the dHalf object with new
     * value, @param l.  @param n = 0 specifies the first element.  
     **/
    public void setElementAt(int n, Long l)
    {
		this.entries[n] = l;
    }


    /**
     * Returns the string representation.
     */
    public String toString()
    {
		String s = ".word ";
		int length = entries.length;
	
		if (length == 0) return "";
	
		s += entries[0].toString();	

		for(int i=1; i<length; i++) 
		{
		   s += ","+entries[i].toString();
		}
	
		return s;
    }
}