codegen.java

一个C语言子集的编译器

/*
 * @(#)CodeGen.java	1.0.0  05/13/2007
 *
 * Copyright 2007 Xuxt@buaa, No.34060520 All rights reserved.
 */
package com.king4solomon.homework.compiler.core;

import java.util.*;
import com.king4solomon.homework.compiler.gui.*;
import com.king4solomon.homework.compiler.pvm.Instruction;

/**
 * @author Xuxt@buaa
 * @version 1.0.0
 */
public class CodeGen {

	
	public static void gen(int instr, int lv, int a) {
		codeBuf.add(new Instruction(instr, lv, a));
		px++;
		CodePane.clear();
		int num = 1;
		for (Instruction i : codeBuf) {
			CodePane.appand(num++ + "    " + instructions[i.instruction]
					+ "    " + i.level + "    " + i.value);
		}
	}

	
	public static void gen(int instr, int tp, String val) {
		codeBuf.add(new Instruction(instr, tp, val));
		px++;
		CodePane.clear();
		int num = 1;
		for (Instruction i : codeBuf) {
			CodePane.appand(num++ + "    " + instructions[i.instruction]
					+ "    " + i.level + "    " + i.value);
		}
	}

	
	public static void reset(int idx, int instr, int lv, int a) {
		codeBuf.set(idx - 1, new Instruction(instr, lv, a));
		CodePane.clear();
		int num = 1;
		for (Instruction i : codeBuf) {
			CodePane.appand(num++ + "    " + instructions[i.instruction]
					+ "    " + i.level + "    " + i.value);
		}
	}


	public static void init() {
		px = 1;
		codeBuf = new ArrayList<Instruction>();
	}

	
	public static ArrayList<Instruction> getCode() {
		return codeBuf;
	}

	
	public static int px;

	
	private static ArrayList<Instruction> codeBuf = new ArrayList<Instruction>();

	
	public static String[] instructions = { "JMP", "JPC", "RED", "WRT", "STO",
			"LOD", "OPR", "LIT", "INT", "CAL", "RET", "STR", "", "STC", "LDR",
			"", "LDC", "HLT", "LST", "CRJ", "CRC", "TPC"};

}