344 lines
14 KiB
C#
344 lines
14 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Reflection;
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using System.Reflection.Emit;
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namespace Easy4net.Common
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{
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/// <summary>Delegate for calling a method that is not known at runtime.</summary>
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/// <param name="target">the object to be called or null if the call is to a static method.</param>
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/// <param name="parameters">the parameters to the method.</param>
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/// <returns>the return value for the method or null if it doesn't return anything.</returns>
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public delegate object FastInvokeHandler(object target, object[] parameters);
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/// <summary>Delegate for creating and object at runtime using the default constructor.</summary>
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/// <returns>the newly created object.</returns>
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public delegate object FastCreateInstanceHandler();
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/// <summary>Delegate to get an arbitraty property at runtime.</summary>
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/// <param name="target">the object instance whose property will be obtained.</param>
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/// <returns>the property value.</returns>
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public delegate object FastPropertyGetHandler(object target);
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/// <summary>Delegate to set an arbitrary property at runtime.</summary>
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/// <param name="target">the object instance whose property will be modified.</param>
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/// <param name="parameter"></param>
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public delegate void FastPropertySetHandler(object target, object parameter);
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/// <summary>Class with helper methods for dynamic invocation generating IL on the fly.</summary>
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public static class DynamicCalls
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{
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/// <summary>
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/// 用于存放GetMethodInvoker的Dictionary
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/// </summary>
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private static Dictionary<MethodInfo, FastInvokeHandler> dictInvoker = new Dictionary<MethodInfo, FastInvokeHandler>();
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/// <summary>
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/// 快速执行指定方法
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/// </summary>
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/// <param name="methodInfo"></param>
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/// <returns></returns>
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public static FastInvokeHandler GetMethodInvoker(MethodInfo methodInfo)
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{
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lock (dictInvoker)
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{
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if (dictInvoker.ContainsKey(methodInfo)) return dictInvoker[methodInfo];
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// generates a dynamic method to generate a FastInvokeHandler delegate
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DynamicMethod dynamicMethod = new DynamicMethod(string.Empty, typeof(object), new Type[] { typeof(object), typeof(object[]) }, methodInfo.DeclaringType.Module);
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ILGenerator ilGenerator = dynamicMethod.GetILGenerator();
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ParameterInfo[] parameters = methodInfo.GetParameters();
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Type[] paramTypes = new Type[parameters.Length];
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// copies the parameter types to an array
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for (int i = 0; i < paramTypes.Length; i++)
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{
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if (parameters[i].ParameterType.IsByRef)
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paramTypes[i] = parameters[i].ParameterType.GetElementType();
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else
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paramTypes[i] = parameters[i].ParameterType;
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}
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LocalBuilder[] locals = new LocalBuilder[paramTypes.Length];
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// generates a local variable for each parameter
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for (int i = 0; i < paramTypes.Length; i++)
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{
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locals[i] = ilGenerator.DeclareLocal(paramTypes[i], true);
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}
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// creates code to copy the parameters to the local variables
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for (int i = 0; i < paramTypes.Length; i++)
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{
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ilGenerator.Emit(OpCodes.Ldarg_1);
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EmitFastInt(ilGenerator, i);
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ilGenerator.Emit(OpCodes.Ldelem_Ref);
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EmitCastToReference(ilGenerator, paramTypes[i]);
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ilGenerator.Emit(OpCodes.Stloc, locals[i]);
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}
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if (!methodInfo.IsStatic)
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{
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// loads the object into the stack
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ilGenerator.Emit(OpCodes.Ldarg_0);
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}
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// loads the parameters copied to the local variables into the stack
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for (int i = 0; i < paramTypes.Length; i++)
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{
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if (parameters[i].ParameterType.IsByRef)
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ilGenerator.Emit(OpCodes.Ldloca_S, locals[i]);
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else
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ilGenerator.Emit(OpCodes.Ldloc, locals[i]);
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}
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// calls the method
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if (!methodInfo.IsStatic)
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{
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ilGenerator.EmitCall(OpCodes.Callvirt, methodInfo, null);
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}
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else
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{
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ilGenerator.EmitCall(OpCodes.Call, methodInfo, null);
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}
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// creates code for handling the return value
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if (methodInfo.ReturnType == typeof(void))
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{
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ilGenerator.Emit(OpCodes.Ldnull);
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}
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else
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{
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EmitBoxIfNeeded(ilGenerator, methodInfo.ReturnType);
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}
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// iterates through the parameters updating the parameters passed by ref
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for (int i = 0; i < paramTypes.Length; i++)
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{
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if (parameters[i].ParameterType.IsByRef)
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{
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ilGenerator.Emit(OpCodes.Ldarg_1);
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EmitFastInt(ilGenerator, i);
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ilGenerator.Emit(OpCodes.Ldloc, locals[i]);
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if (locals[i].LocalType.IsValueType)
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ilGenerator.Emit(OpCodes.Box, locals[i].LocalType);
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ilGenerator.Emit(OpCodes.Stelem_Ref);
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}
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}
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// returns the value to the caller
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ilGenerator.Emit(OpCodes.Ret);
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// converts the DynamicMethod to a FastInvokeHandler delegate to call to the method
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FastInvokeHandler invoker = (FastInvokeHandler)dynamicMethod.CreateDelegate(typeof(FastInvokeHandler));
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dictInvoker.Add(methodInfo, invoker);
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return invoker;
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}
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}
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/// <summary>
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/// 用于存放GetInstanceCreator的Dictionary
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/// </summary>
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private static Dictionary<Type, FastCreateInstanceHandler> dictCreator = new Dictionary<Type, FastCreateInstanceHandler>();
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/// <summary>Gets the instance creator delegate that can be use to create instances of the specified type.</summary>
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/// <param name="type">The type of the objects we want to create.</param>
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/// <returns>A delegate that can be used to create the objects.</returns>
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public static FastCreateInstanceHandler GetInstanceCreator(Type type)
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{
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lock (dictCreator)
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{
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if (dictCreator.ContainsKey(type)) return dictCreator[type];
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// generates a dynamic method to generate a FastCreateInstanceHandler delegate
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DynamicMethod dynamicMethod = new DynamicMethod(string.Empty, type, new Type[0], typeof(DynamicCalls).Module);
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ILGenerator ilGenerator = dynamicMethod.GetILGenerator();
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// generates code to create a new object of the specified type using the default constructor
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ilGenerator.Emit(OpCodes.Newobj, type.GetConstructor(Type.EmptyTypes));
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// returns the value to the caller
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ilGenerator.Emit(OpCodes.Ret);
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// converts the DynamicMethod to a FastCreateInstanceHandler delegate to create the object
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FastCreateInstanceHandler creator = (FastCreateInstanceHandler)dynamicMethod.CreateDelegate(typeof(FastCreateInstanceHandler));
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dictCreator.Add(type, creator);
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return creator;
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}
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}
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/// <summary>
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/// 用于存放GetPropertyGetter的Dictionary
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/// </summary>
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private static Dictionary<PropertyInfo, FastPropertyGetHandler> dictGetter = new Dictionary<PropertyInfo, FastPropertyGetHandler>();
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/// <summary>
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/// 快速获取成员属性
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/// </summary>
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/// <param name="propInfo"></param>
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/// <returns></returns>
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public static FastPropertyGetHandler GetPropertyGetter(PropertyInfo propInfo)
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{
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lock (dictGetter)
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{
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if (dictGetter.ContainsKey(propInfo)) return dictGetter[propInfo];
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// generates a dynamic method to generate a FastPropertyGetHandler delegate
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DynamicMethod dynamicMethod = new DynamicMethod(string.Empty, typeof(object), new Type[] { typeof(object) }, propInfo.DeclaringType.Module);
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ILGenerator ilGenerator = dynamicMethod.GetILGenerator();
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// loads the object into the stack
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ilGenerator.Emit(OpCodes.Ldarg_0);
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// calls the getter
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ilGenerator.EmitCall(OpCodes.Callvirt, propInfo.GetGetMethod(), null);
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// creates code for handling the return value
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EmitBoxIfNeeded(ilGenerator, propInfo.PropertyType);
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// returns the value to the caller
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ilGenerator.Emit(OpCodes.Ret);
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// converts the DynamicMethod to a FastPropertyGetHandler delegate to get the property
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FastPropertyGetHandler getter = (FastPropertyGetHandler)dynamicMethod.CreateDelegate(typeof(FastPropertyGetHandler));
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dictGetter.Add(propInfo, getter);
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return getter;
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}
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}
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/// <summary>
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/// 用于存放SetPropertySetter的Dictionary
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/// </summary>
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private static Dictionary<PropertyInfo, FastPropertySetHandler> dictSetter = new Dictionary<PropertyInfo, FastPropertySetHandler>();
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/// <summary>
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/// 快速设置成员属性
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/// </summary>
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/// <param name="propInfo"></param>
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/// <returns></returns>
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public static FastPropertySetHandler GetPropertySetter(PropertyInfo propInfo)
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{
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lock (dictSetter)
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{
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if (dictSetter.ContainsKey(propInfo)) return dictSetter[propInfo];
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// generates a dynamic method to generate a FastPropertySetHandler delegate
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DynamicMethod dynamicMethod = new DynamicMethod(string.Empty, null, new Type[] { typeof(object), typeof(object) }, propInfo.DeclaringType.Module);
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ILGenerator ilGenerator = dynamicMethod.GetILGenerator();
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// loads the object into the stack
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ilGenerator.Emit(OpCodes.Ldarg_0);
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// loads the parameter from the stack
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ilGenerator.Emit(OpCodes.Ldarg_1);
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// cast to the proper type (unboxing if needed)
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EmitCastToReference(ilGenerator, propInfo.PropertyType);
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// calls the setter
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ilGenerator.EmitCall(OpCodes.Callvirt, propInfo.GetSetMethod(), null);
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// terminates the call
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ilGenerator.Emit(OpCodes.Ret);
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// converts the DynamicMethod to a FastPropertyGetHandler delegate to get the property
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FastPropertySetHandler setter = (FastPropertySetHandler)dynamicMethod.CreateDelegate(typeof(FastPropertySetHandler));
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dictSetter.Add(propInfo, setter);
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return setter;
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}
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}
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/// <summary>Emits the cast to a reference, unboxing if needed.</summary>
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/// <param name="ilGenerator">The MSIL generator.</param>
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/// <param name="type">The type to cast.</param>
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private static void EmitCastToReference(ILGenerator ilGenerator, System.Type type)
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{
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if (type.IsValueType)
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{
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ilGenerator.Emit(OpCodes.Unbox_Any, type);
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}
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else
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{
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ilGenerator.Emit(OpCodes.Castclass, type);
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}
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}
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/// <summary>Boxes a type if needed.</summary>
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/// <param name="ilGenerator">The MSIL generator.</param>
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/// <param name="type">The type.</param>
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private static void EmitBoxIfNeeded(ILGenerator ilGenerator, System.Type type)
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{
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if (type.IsValueType)
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{
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ilGenerator.Emit(OpCodes.Box, type);
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}
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}
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/// <summary>Emits code to save an integer to the evaluation stack.</summary>
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/// <param name="ilGenerator">The MSIL generator.</param>
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/// <param name="value">The value to push.</param>
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private static void EmitFastInt(ILGenerator ilGenerator, int value)
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{
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// for small integers, emit the proper opcode
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switch (value)
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{
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case -1:
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ilGenerator.Emit(OpCodes.Ldc_I4_M1);
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return;
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case 0:
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ilGenerator.Emit(OpCodes.Ldc_I4_0);
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return;
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case 1:
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ilGenerator.Emit(OpCodes.Ldc_I4_1);
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return;
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case 2:
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ilGenerator.Emit(OpCodes.Ldc_I4_2);
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return;
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case 3:
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ilGenerator.Emit(OpCodes.Ldc_I4_3);
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return;
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case 4:
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ilGenerator.Emit(OpCodes.Ldc_I4_4);
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return;
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case 5:
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ilGenerator.Emit(OpCodes.Ldc_I4_5);
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return;
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case 6:
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ilGenerator.Emit(OpCodes.Ldc_I4_6);
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return;
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case 7:
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ilGenerator.Emit(OpCodes.Ldc_I4_7);
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return;
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case 8:
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ilGenerator.Emit(OpCodes.Ldc_I4_8);
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return;
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}
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// for bigger values emit the short or long opcode
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if (value > -129 && value < 128)
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{
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ilGenerator.Emit(OpCodes.Ldc_I4_S, (SByte)value);
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}
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else
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{
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ilGenerator.Emit(OpCodes.Ldc_I4, value);
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}
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}
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}
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}
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