asmdirective.java

用Java实现的编译器。把源代码编译成SPARC汇编程序

// $Id: ASMDirective.java,v 1.6 1999/12/01 17:48:58 deberg Exp $

package java6035.tools.ASM;

/**
 * ASMDirective
 *
 * represents a directive in ASM file.
 */

public abstract class ASMDirective extends ASMEntry
{
    public static final int SECTION   = 0;
    public static final int ALIGN     = 1;
    public static final int ASCII     = 2;
    public static final int ASCIZ     = 3;
    public static final int BYTE      = 4;
    public static final int HALF      = 5;
    public static final int WORD      = 6;
	public static final int SKIP	  = 7;
    public static final int COMMON    = 8 ;
    public static final int GLOBAL    = 9 ;
    public static final int LOCAL     = 10;
    public static final int SIZE	  =	11;
	public static final int FILE	  =	12;
		
    protected int asmkind() { return ASMDIRECTIVE; }

    protected int type;

    ASMDirective() {
	System.err.println("Illegal constructor call.\n" + 
			   "Dying a terrible death.");
	System.exit(-1);
    }

    ASMDirective(int type)
    {
	this.type = type;
    }

    /**
     * Returns the type of the directive.
     */
    public final int getType()
    {
	return this.type;
    }

    /**
     * Returns the string representation.
     */
    public String toString()
    {
	switch(type) {
        case SECTION: 
            return ".section";
        case ALIGN:
            return ".align";
        case ASCII:
            return ".ascii";
        case ASCIZ:
            return ".asciz";
        case BYTE:
            return ".byte";
        case HALF:
            return ".half";
        case WORD:
            return ".word";
        case SKIP:
            return ".skip";
        case COMMON:
            return ".common";
        case GLOBAL:
            return ".global";
		case LOCAL:
			return ".local";
		case SIZE:
			return ".size";
		case FILE:
			return ".file";
        default:
            throw new ASMException("Illegal directive: "+type);
	}
    }
}