104 lines
3.5 KiB
C#
104 lines
3.5 KiB
C#
using System;
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using System.Collections.Generic;
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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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namespace ARMeilleure.Translation
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{
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static class DelegateHelper
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{
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private const string DelegateTypesAssemblyName = "JitDelegateTypes";
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private static readonly ModuleBuilder _modBuilder;
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private static readonly Dictionary<string, Type> _delegateTypesCache;
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static DelegateHelper()
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{
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AssemblyBuilder asmBuilder = AssemblyBuilder.DefineDynamicAssembly(new AssemblyName(DelegateTypesAssemblyName), AssemblyBuilderAccess.Run);
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_modBuilder = asmBuilder.DefineDynamicModule(DelegateTypesAssemblyName);
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_delegateTypesCache = new Dictionary<string, Type>();
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}
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public static Delegate GetDelegate(MethodInfo info)
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{
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ArgumentNullException.ThrowIfNull(info);
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Type[] parameters = info.GetParameters().Select(pI => pI.ParameterType).ToArray();
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Type returnType = info.ReturnType;
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Type delegateType = GetDelegateType(parameters, returnType);
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return Delegate.CreateDelegate(delegateType, info);
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}
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private static Type GetDelegateType(Type[] parameters, Type returnType)
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{
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string key = GetFunctionSignatureKey(parameters, returnType);
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if (!_delegateTypesCache.TryGetValue(key, out Type delegateType))
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{
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delegateType = MakeDelegateType(parameters, returnType, key);
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_delegateTypesCache.TryAdd(key, delegateType);
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}
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return delegateType;
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}
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private static string GetFunctionSignatureKey(Type[] parameters, Type returnType)
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{
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string sig = GetTypeName(returnType);
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foreach (Type type in parameters)
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{
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sig += '_' + GetTypeName(type);
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}
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return sig;
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}
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private static string GetTypeName(Type type)
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{
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return type.FullName.Replace(".", string.Empty);
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}
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private const MethodAttributes CtorAttributes =
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MethodAttributes.RTSpecialName |
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MethodAttributes.HideBySig |
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MethodAttributes.Public;
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private const TypeAttributes DelegateTypeAttributes =
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TypeAttributes.Class |
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TypeAttributes.Public |
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TypeAttributes.Sealed |
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TypeAttributes.AnsiClass |
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TypeAttributes.AutoClass;
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private const MethodImplAttributes ImplAttributes =
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MethodImplAttributes.Runtime |
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MethodImplAttributes.Managed;
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private const MethodAttributes InvokeAttributes =
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MethodAttributes.Public |
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MethodAttributes.HideBySig |
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MethodAttributes.NewSlot |
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MethodAttributes.Virtual;
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private static readonly Type[] _delegateCtorSignature = { typeof(object), typeof(IntPtr) };
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private static Type MakeDelegateType(Type[] parameters, Type returnType, string name)
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{
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TypeBuilder builder = _modBuilder.DefineType(name, DelegateTypeAttributes, typeof(MulticastDelegate));
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builder.DefineConstructor(CtorAttributes, CallingConventions.Standard, _delegateCtorSignature).SetImplementationFlags(ImplAttributes);
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builder.DefineMethod("Invoke", InvokeAttributes, returnType, parameters).SetImplementationFlags(ImplAttributes);
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return builder.CreateTypeInfo();
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}
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}
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}
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