/* Copyright (C) 2004 - 2006  db4objects Inc.  http://www.db4o.com

This file is part of the db4o open source object database.

db4o is free software; you can redistribute it and/or modify it under
the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation and as clarified by db4objects' GPL 
interpretation policy, available at
http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
Suite 350, San Mateo, CA 94403, USA.

db4o is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
namespace Mono.Cecil.Cil {

	public struct OpCode {

		string m_name;
		byte m_op1;
		byte m_op2;
		int m_size;

		FlowControl m_flowControl;
		OpCodeType m_opCodeType;
		OperandType m_operandType;
		StackBehaviour m_stackBehaviourPop;
		StackBehaviour m_stackBehaviourPush;

		public string Name {
			get { return m_name; }
		}

		public int Size {
			get { return m_size; }
		}

		public byte Op1 {
			get { return m_op1; }
		}

		public byte Op2 {
			get { return m_op2; }
		}

		public short Value {
			get { return m_size == 1 ? m_op2 : (short) ((m_op1 << 8) | m_op2); }
		}

		public FlowControl FlowControl {
			get { return m_flowControl; }
		}

		public OpCodeType OpCodeType {
			get { return m_opCodeType; }
		}

		public OperandType OperandType {
			get { return m_operandType; }
		}

		public StackBehaviour StackBehaviourPop {
			get { return m_stackBehaviourPop; }
		}

		public StackBehaviour StackBehaviourPush {
			get { return m_stackBehaviourPush; }
		}

		internal OpCode (string name, byte op1, byte op2, int size, FlowControl flowControl,
			OpCodeType opCodeType, OperandType operandType,
			StackBehaviour pop, StackBehaviour push)
		{
			m_name = name;
			m_op1 = op1;
			m_op2 = op2;
			m_size = size;
			m_flowControl = flowControl;
			m_opCodeType = opCodeType;
			m_operandType = operandType;
			m_stackBehaviourPop = pop;
			m_stackBehaviourPush = push;
		}

		public override int GetHashCode ()
		{
			return this.Value;
		}

		public override bool Equals (object obj)
		{
			if (!(obj is OpCode))
				return false;
			OpCode v = (OpCode) obj;
			return v.m_op1 == m_op1 && v.m_op2 == m_op2;
		}

		public static bool operator == (OpCode one, OpCode other)
		{
			return one.Equals (other);
		}

		public static bool operator != (OpCode one, OpCode other)
		{
			return !one.Equals (other);
		}

		public override string ToString ()
		{
			return m_name;
		}
	}
}