134 lines
3.6 KiB
C#
Executable File
134 lines
3.6 KiB
C#
Executable File
#region Copyright & License Information
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/*
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* Copyright 2007-2010 The OpenRA Developers (see AUTHORS)
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation. For more information,
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* see LICENSE.
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*/
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#endregion
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using System;
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using System.Linq;
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using System.Reflection;
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using System.Reflection.Emit;
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using OpenRA.FileFormats;
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namespace OpenRA
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{
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public class SyncAttribute : Attribute { }
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public static class Sync
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{
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static Cache<Type, Func<object, int>> hashFuncCache = new Cache<Type, Func<object, int>>( t => GenerateHashFunc( t ) );
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public static int CalculateSyncHash( object obj )
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{
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return hashFuncCache[ obj.GetType() ]( obj );
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}
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static void EmitSyncOpcodes(Type type, ILGenerator il)
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{
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if (type == typeof(int))
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{
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il.Emit(OpCodes.Xor);
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}
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else if (type == typeof(bool))
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{
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var l = il.DefineLabel();
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il.Emit(OpCodes.Ldc_I4, 0xaaa);
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il.Emit(OpCodes.Brtrue, l);
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il.Emit(OpCodes.Pop);
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il.Emit(OpCodes.Ldc_I4, 0x555);
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il.MarkLabel(l);
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il.Emit(OpCodes.Xor);
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}
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else if (type == typeof(int2))
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{
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il.EmitCall(OpCodes.Call, ((Func<int2, int>)hash_int2).Method, null);
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il.Emit(OpCodes.Xor);
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}
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else if (type == typeof(TypeDictionary))
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{
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il.EmitCall(OpCodes.Call, ((Func<TypeDictionary, int>)hash_tdict).Method, null);
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il.Emit(OpCodes.Xor);
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}
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else if (type == typeof(Actor))
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{
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il.EmitCall(OpCodes.Call, ((Func<Actor, int>)hash_actor).Method, null);
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il.Emit(OpCodes.Xor);
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}
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else if (type == typeof(Player))
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{
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il.EmitCall(OpCodes.Call, ((Func<Player, int>)hash_player).Method, null);
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il.Emit(OpCodes.Xor);
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}
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else if (type.HasAttribute<SyncAttribute>())
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{
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il.EmitCall(OpCodes.Call, ((Func<object, int>)CalculateSyncHash).Method, null);
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il.Emit(OpCodes.Xor);
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}
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else
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throw new NotImplementedException("SyncAttribute on member of unhashable type: {0}".F(type.FullName));
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}
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public static Func<object, int> GenerateHashFunc(Type t)
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{
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var d = new DynamicMethod("hash_{0}".F(t.Name), typeof(int), new Type[] { typeof(object) }, t);
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var il = d.GetILGenerator();
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var this_ = il.DeclareLocal(t).LocalIndex;
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il.Emit(OpCodes.Ldarg_0);
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il.Emit(OpCodes.Castclass, t);
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il.Emit(OpCodes.Stloc, this_);
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il.Emit(OpCodes.Ldc_I4_0);
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const BindingFlags bf = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance;
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foreach (var field in t.GetFields(bf).Where(x => x.HasAttribute<SyncAttribute>()))
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{
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il.Emit(OpCodes.Ldloc, this_);
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il.Emit(OpCodes.Ldfld, field);
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EmitSyncOpcodes(field.FieldType, il);
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}
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foreach (var prop in t.GetProperties(bf).Where(x => x.HasAttribute<SyncAttribute>()))
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{
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il.Emit(OpCodes.Ldloc, this_);
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il.EmitCall(OpCodes.Call, prop.GetGetMethod(), null);
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EmitSyncOpcodes(prop.PropertyType, il);
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}
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il.Emit(OpCodes.Ret);
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return (Func<object, int>)d.CreateDelegate(typeof(Func<object, int>));
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}
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public static int hash_int2( int2 i2 )
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{
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return ( ( i2.X * 5 ) ^ ( i2.Y * 3 ) ) / 4;
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}
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public static int hash_tdict( TypeDictionary d )
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{
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int ret = 0;
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foreach( var o in d )
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ret += CalculateSyncHash( o );
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return ret;
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}
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public static int hash_actor( Actor a )
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{
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if( a != null )
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return (int)( a.ActorID << 16 );
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return 0;
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}
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public static int hash_player( Player p )
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{
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if( p != null )
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return p.Index * 0x567;
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return 0;
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}
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}
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}
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