GetFieldCmd.java

package com.coding.mini_jvm.src.com.coderising.jvm.cmd;

import com.coding.mini_jvm.src.com.coderising.jvm.clz.ClassFile;
import com.coding.mini_jvm.src.com.coderising.jvm.constant.ConstantPool;
import com.coding.mini_jvm.src.com.coderising.jvm.constant.FieldRefInfo;
import com.coding.mini_jvm.src.com.coderising.jvm.engine.ExecutionResult;
import com.coding.mini_jvm.src.com.coderising.jvm.engine.JavaObject;
import com.coding.mini_jvm.src.com.coderising.jvm.engine.StackFrame;

public class GetFieldCmd extends TwoOperandCmd {

	public GetFieldCmd(ClassFile clzFile,String opCode) {
		super(clzFile,opCode);		
	}

	@Override
	public String toString(ConstantPool pool) {
		
		return super.getOperandAsField(pool);
	}

	@Override
	public void execute(StackFrame frame, ExecutionResult result) {
		FieldRefInfo fieldRefInfo = (FieldRefInfo)this.getConstantInfo(this.getIndex());
		String fieldName = fieldRefInfo.getFieldName();
		JavaObject jo = frame.getOprandStack().pop();
		frame.getOprandStack().push(jo.getFieldValue(fieldName));
	}


}