126 lines
3.8 KiB
C#
Executable File
126 lines
3.8 KiB
C#
Executable File
#region Copyright & License Information
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/*
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* Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
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* This file is part of OpenRA.
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*
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* OpenRA is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* OpenRA is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with OpenRA. If not, see <http://www.gnu.org/licenses/>.
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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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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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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.GetCustomAttributes( typeof( SyncAttribute ), true ).Length != 0 ) )
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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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if( field.FieldType == typeof( int ) )
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{
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il.Emit( OpCodes.Xor );
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}
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else if( field.FieldType == 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( field.FieldType == 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( field.FieldType == 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( field.FieldType == 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( field.FieldType == 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
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throw new NotImplementedException( "SyncAttribute on unhashable field" );
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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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internal 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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internal 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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internal 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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internal 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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