MMRDelegateCommon.cs 5.2 KB

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  1. /*
  2. * Copyright (c) Contributors, http://opensimulator.org/
  3. * See CONTRIBUTORS.TXT for a full list of copyright holders.
  4. *
  5. * Redistribution and use in source and binary forms, with or without
  6. * modification, are permitted provided that the following conditions are met:
  7. * * Redistributions of source code must retain the above copyright
  8. * notice, this list of conditions and the following disclaimer.
  9. * * Redistributions in binary form must reproduce the above copyright
  10. * notice, this list of conditions and the following disclaimer in the
  11. * documentation and/or other materials provided with the distribution.
  12. * * Neither the name of the OpenSimulator Project nor the
  13. * names of its contributors may be used to endorse or promote products
  14. * derived from this software without specific prior written permission.
  15. *
  16. * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
  17. * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  18. * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  19. * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
  20. * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21. * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22. * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  23. * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24. * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  25. * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26. */
  27. using System;
  28. using System.Collections.Generic;
  29. using System.Reflection;
  30. using System.Reflection.Emit;
  31. namespace OpenSim.Region.ScriptEngine.Yengine
  32. {
  33. public class DelegateCommon
  34. {
  35. private string sig; // rettype(arg1type,arg2type,...), eg, "void(list,string,integer)"
  36. private Type type; // resultant delegate type
  37. private static Dictionary<string, DelegateCommon> delegateCommons = new Dictionary<string, DelegateCommon>();
  38. private static Dictionary<Type, DelegateCommon> delegateCommonsBySysType = new Dictionary<Type, DelegateCommon>();
  39. private static ModuleBuilder delegateModuleBuilder = null;
  40. public static Type[] constructorArgTypes = new Type[] { typeof(object), typeof(IntPtr) };
  41. private DelegateCommon()
  42. {
  43. }
  44. public static Type GetType(System.Type ret, System.Type[] args, string sig)
  45. {
  46. DelegateCommon dc;
  47. lock(delegateCommons)
  48. {
  49. if(!delegateCommons.TryGetValue(sig, out dc))
  50. {
  51. dc = new DelegateCommon();
  52. dc.sig = sig;
  53. dc.type = CreateDelegateType(sig, ret, args);
  54. delegateCommons.Add(sig, dc);
  55. delegateCommonsBySysType.Add(dc.type, dc);
  56. }
  57. }
  58. return dc.type;
  59. }
  60. public static Type TryGetType(string sig)
  61. {
  62. DelegateCommon dc;
  63. lock(delegateCommons)
  64. {
  65. if(!delegateCommons.TryGetValue(sig, out dc))
  66. dc = null;
  67. }
  68. return (dc == null) ? null : dc.type;
  69. }
  70. public static string TryGetName(Type t)
  71. {
  72. DelegateCommon dc;
  73. lock(delegateCommons)
  74. {
  75. if(!delegateCommonsBySysType.TryGetValue(t, out dc))
  76. dc = null;
  77. }
  78. return (dc == null) ? null : dc.sig;
  79. }
  80. // http://blog.bittercoder.com/PermaLink,guid,a770377a-b1ad-4590-9145-36381757a52b.aspx
  81. private static Type CreateDelegateType(string name, Type retType, Type[] argTypes)
  82. {
  83. if(delegateModuleBuilder == null)
  84. {
  85. AssemblyName assembly = new AssemblyName();
  86. assembly.Name = "CustomDelegateAssembly";
  87. AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assembly, AssemblyBuilderAccess.Run);
  88. delegateModuleBuilder = assemblyBuilder.DefineDynamicModule("CustomDelegateModule");
  89. }
  90. TypeBuilder typeBuilder = delegateModuleBuilder.DefineType(name,
  91. TypeAttributes.Public | TypeAttributes.Sealed | TypeAttributes.Class |
  92. TypeAttributes.AnsiClass | TypeAttributes.AutoClass, typeof(MulticastDelegate));
  93. ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(
  94. MethodAttributes.RTSpecialName | MethodAttributes.HideBySig | MethodAttributes.Public,
  95. CallingConventions.Standard, constructorArgTypes);
  96. constructorBuilder.SetImplementationFlags(MethodImplAttributes.Runtime | MethodImplAttributes.Managed);
  97. MethodBuilder methodBuilder = typeBuilder.DefineMethod("Invoke",
  98. MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.NewSlot |
  99. MethodAttributes.Virtual, retType, argTypes);
  100. methodBuilder.SetImplementationFlags(MethodImplAttributes.Managed | MethodImplAttributes.Runtime);
  101. return typeBuilder.CreateType();
  102. }
  103. }
  104. }