instruction.java

用Java实现的编译器。把源代码编译成SPARC汇编程序

// $Id: Instruction.java,v 1.5 1999/10/06 03:40:00 deberg Exp $

package java6035.tools.IR;

/**
 * Instruction class represents a statement or instruction in your program.
 * There are several forms of instructions in this package:
 *
 * <PRE>
 * assignment instrs         SimpleInstr class
 * expression statement      SimpleInstr class
 * branch instrs             BranchInstr class
 * label instr               LabelInstr  class
 * return instr              ReturnInstr class
 * </PRE>
 */

public abstract class Instruction extends TreeNode 
{
    public String PPrint(int indent, boolean recursive)
    {
        String output = new String();
        for(int i=0;i<indent;i++) output += " ";
        output += "PPrint of instructions not supported\n";

        return output;
    }
}