ByteCodeCommand.java

package com.coderising.jvm.cmd;

import java.util.HashMap;
import java.util.Map;

public abstract class ByteCodeCommand {
	private int offset;
	private String opCode;
	private static Map<String,String> codeMap = new HashMap<String,String>();
	
	static{
		codeMap.put("01", "aconst_null");
		
		codeMap.put("BB", "new");
		codeMap.put("37", "lstore");
		codeMap.put("B7", "invokespecial");
		codeMap.put("B6", "invokevirtual");
		codeMap.put("B4", "getfield");
		codeMap.put("B5", "putfield");
		codeMap.put("B2", "getstatic");
		
		codeMap.put("2A", "aload_0");
		codeMap.put("2B", "aload_1");
		codeMap.put("2C", "aload_2");
		
		codeMap.put("10", "bipush");
		codeMap.put("15", "iload");
		codeMap.put("1A", "iload_0");
		codeMap.put("1B", "iload_1");
		codeMap.put("1C", "iload_2");
		codeMap.put("1D", "iload_3");
		
		codeMap.put("25", "fload_3");
		
		codeMap.put("1E", "lload_0");
		
		codeMap.put("24", "fload_2");
		codeMap.put("4C", "astore_1");
		
		codeMap.put("A2", "if_icmp_ge");
		codeMap.put("A4", "if_icmple");
		
		codeMap.put("A7", "goto");
		
		codeMap.put("B1", "return");
		codeMap.put("AC", "ireturn");
		codeMap.put("AE", "freturn");
		
		codeMap.put("03", "iconst_0");
		codeMap.put("04", "iconst_1");
		
		codeMap.put("3C", "istore_1");
		codeMap.put("3D", "istore_2");
		
		codeMap.put("59", "dup");
		
		codeMap.put("60", "iadd");
		codeMap.put("84", "iinc");
		
		codeMap.put("12", "ldc");
	}
	
	public int getOffset() {
		return offset;
	}
	public void setOffset(int offset) {
		this.offset = offset;
	}
	public String getOpCode() {
		return opCode;
	}
	public void setOpCode(String opCode) {
		this.opCode = opCode;
	}
	public String getReadableCodeText() {
		String str = codeMap.get(this.opCode);
		if(str == null) {
			str = this.opCode;
		}
		return str;
	}
	
	abstract public int getLength();
	
}