immedexpr.java

来自「用Java实现的编译器。把源代码编译成SPARC汇编程序」· Java 代码 · 共 50 行

// $Id: ImmedExpr.java,v 1.8 1999/09/29 06:20:44 deberg Exp $

package java6035.tools.IR;

/**
 * ImmedExpr is the abstract class to represent immediates. Students
 * should replace this class with one of their own.  */

public abstract class ImmedExpr extends Expression implements Rhs
{
    protected int expkind()
    {
	return IMMED_EXPR;
    }

    /**
     * Walkable interface: returns the name of the node.
     */
    public String getNodeName()
    {
	return "immed_expr";
    }

    /**
     * Walkable interface: returns the number of neighbors.
     */
    public int getNeighborCount()
    {
	return 0;
    }

    /**
     * Walkable interface: returns the specified neighbor: 0, type; 
     * 1, size.
     */
    public Object getNeighbor(int index)
    {
	return null;
    }

    public String PPrint(int indent, boolean recursive)
    {
        String output = new String();
        for(int i=0;i<indent;i++) output += " ";
        output += "(/* must implement PPrint() of Immediates */)\n";

        return output;
    }
}