Fishery
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bbradson
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// Copyright (c) 2022 bradson
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at https://mozilla.org/MPL/2.0/.
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using System.Diagnostics.CodeAnalysis;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Reflection.Emit;
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using System.Runtime.CompilerServices;
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using Mono.Cecil;
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using MonoMod.Utils;
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using Verse;
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using static Mono.Cecil.Mixin;
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namespace FisheryLib;
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public static class Reflection
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{
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public static CodeInstructions GetCodeInstructions(Delegate method)
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=> PatchProcessor.GetCurrentInstructions(method.Method);
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public static CodeInstructions GetCodeInstructions(Expression<Action> method)
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=> PatchProcessor.GetCurrentInstructions(SymbolExtensions.GetMethodInfo(method));
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public static CodeInstructions MakeReplacementCall(Delegate method)
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=> MakeReplacementCall(method.Method);
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public static CodeInstructions MakeReplacementCall(MethodInfo method)
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{
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if (!method.IsStatic)
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yield return FishTranspiler.This;
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foreach (var argument in method.GetParameters())
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yield return FishTranspiler.Argument(argument);
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yield return FishTranspiler.Call(method);
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yield return FishTranspiler.Return;
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}
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public static Type Type(string assembly, string type) => System.Type.GetType($"{type}, {assembly}");
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public static MethodInfo MethodInfo<T>(T method) where T : Delegate => method.Method;
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public static MethodInfo MethodInfo(string assembly, string type, string name, Type[]? parameters = null, Type[]? generics = null)
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=> AccessTools.Method(Type(assembly, type), name, parameters, generics);
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public static IEnumerable<MethodInfo> MethodsOfName(Type type, string name)
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{
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var methods = MethodsOfNameSilentFail(type, name).ToArray();
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if (!methods.Any())
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ThrowForMethodsOfName(type, name);
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return methods;
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}
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private static void ThrowForMethodsOfName(Type type, string name) => ThrowHelper.ThrowArgumentException($"No methods found for {type.FullDescription()}:{name}");
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public static IEnumerable<MethodInfo> MethodsOfNameSilentFail(Type type, string name)
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=> type?.GetMethods(AccessTools.allDeclared)
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.Where(m => m.Name == name)
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?? Enumerable.Empty<MethodInfo>();
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public static FieldInfo FieldInfo(string assembly, string type, string name) => AccessTools.Field(Type(assembly, type), name);
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public static bool IsAssignableTo(this Type type, [NotNullWhen(true)] Type? targetType, params Type[] generics)
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{
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Guard.IsNotNull(type);
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return targetType != null
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&& (generics is { Length: >= 1 }
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? targetType.MakeGenericType(generics)
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: targetType)
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.IsAssignableFrom(type);
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}
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public static bool AreAssignableFrom(this IEnumerable<Type> types, IEnumerable<Type> targetTypes)
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=> targetTypes.AreAssignableTo(types);
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public static bool AreAssignableTo(this IEnumerable<Type> types, IEnumerable<Type> targetTypes)
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{
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Guard.IsNotNull(types);
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Guard.IsNotNull(targetTypes);
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using var typesEnumerator = types.GetEnumerator();
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using var targetTypesEnumerator = targetTypes.GetEnumerator();
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while (typesEnumerator.MoveNext())
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{
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if (!targetTypesEnumerator.MoveNext()
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|| !targetTypesEnumerator.Current.IsAssignableFrom(typesEnumerator.Current))
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{
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return false;
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}
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}
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return !targetTypesEnumerator.MoveNext();
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}
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public static bool IsNullable(this Type type)
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{
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Guard.IsNotNull(type);
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return type.IsGenericType
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&& type.GetGenericTypeDefinition() == typeof(Nullable<>);
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}
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public static bool IsNullable(this Type nullableType, [NotNullWhen(true)] out Type? valueType)
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{
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if (nullableType.IsNullable())
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{
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valueType = nullableType.GetGenericArguments()[0];
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return true;
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}
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else
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{
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valueType = null;
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return false;
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}
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}
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public static bool HasGenericInterfaceDefinition(this Type type, Type interfaceType)
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{
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Guard.IsNotNull(type);
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return Array.Exists(type.GetInterfaces(), @interface
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=> @interface.IsGenericType
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&& @interface.GetGenericTypeDefinition() == interfaceType);
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}
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public static unsafe IntPtr GetFunctionPointer(this MethodBase method) => method.MethodHandle.GetFunctionPointer();
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public static unsafe delegate*<T> GetFunctionPointer<T>(this MethodBase method) => (delegate*<T>)method.MethodHandle.GetFunctionPointer();
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public static unsafe delegate*<T_in, T_out> GetFunctionPointer<T_in, T_out>(this MethodBase method) => (delegate*<T_in, T_out>)method.MethodHandle.GetFunctionPointer();
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public static unsafe delegate*<T1, T2, T_out> GetFunctionPointer<T1, T2, T_out>(this MethodBase method) => (delegate*<T1, T2, T_out>)method.MethodHandle.GetFunctionPointer();
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public static unsafe delegate*<T1, T2, T3, T_out> GetFunctionPointer<T1, T2, T3, T_out>(this MethodBase method) => (delegate*<T1, T2, T3, T_out>)method.MethodHandle.GetFunctionPointer();
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public static unsafe delegate*<T1, T2, T3, T4, T_out> GetFunctionPointer<T1, T2, T3, T4, T_out>(this MethodBase method) => (delegate*<T1, T2, T3, T4, T_out>)method.MethodHandle.GetFunctionPointer();
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public static unsafe delegate*<T1, T2, T3, T4, T5, T_out> GetFunctionPointer<T1, T2, T3, T4, T5, T_out>(this MethodBase method) => (delegate*<T1, T2, T3, T4, T5, T_out>)method.MethodHandle.GetFunctionPointer();
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public static unsafe delegate*<T1, T2, T3, T4, T5, T6, T_out> GetFunctionPointer<T1, T2, T3, T4, T5, T6, T_out>(this MethodBase method) => (delegate*<T1, T2, T3, T4, T5, T6, T_out>)method.MethodHandle.GetFunctionPointer();
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public static unsafe delegate*<T1, T2, T3, T4, T5, T6, T7, T_out> GetFunctionPointer<T1, T2, T3, T4, T5, T6, T7, T_out>(this MethodBase method) => (delegate*<T1, T2, T3, T4, T5, T6, T7, T_out>)method.MethodHandle.GetFunctionPointer();
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/// <summary>
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/// Finds a constructor with parameters that are either assignable to or assignable from the types in the provided parameters array
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/// </summary>
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/// <param name="type">The type of the object to construct</param>
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/// <param name="parameters">An array of parameter types that are either assignable to or from the parameters of a constructor for the target type</param>
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/// <param name="searchForStatic">Search for static constructors instead of instance constructors</param>
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/// <param name="throwOnFailure">Throw an exception on failure to find a matching constructor</param>
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/// <returns>A ConstructorInfo that best matches the provided arguments. Null on failure if throwOnFailure is set to false</returns>
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public static ConstructorInfo? MatchingConstructor(Type type, Type[]? parameters = null, bool searchForStatic = false, bool throwOnFailure = true)
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{
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Guard.IsNotNull(type);
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parameters ??= Array.Empty<Type>();
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var flags = searchForStatic ? (AccessTools.all & ~BindingFlags.Instance) : (AccessTools.all & ~BindingFlags.Static);
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return TryGetConstructor(type, flags, paramTypes => paramTypes.AreAssignableFrom(parameters))
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?? TryGetConstructor(type, flags, paramTypes => paramTypes.AreAssignableTo(parameters))
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?? (throwOnFailure ? ThrowHelper.ThrowInvalidOperationException<ConstructorInfo>(
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$"No constructor found for type: {type}, parameters: {parameters.ToStringSafeEnumerable()}, static: {searchForStatic}, found constructors: {type.GetConstructors(flags).ToStringSafeEnumerable()}")
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: null);
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}
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private static ConstructorInfo TryGetConstructor(Type type, BindingFlags flags, Predicate<IEnumerable<Type>> predicate)
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=> type.GetConstructors(flags).FirstOrDefault(c
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=> predicate(c.GetParameters().Select(p => p.ParameterType)));
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private static Delegate MakeStructDefaultConstructor(Type type)
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{
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var dm = new DynamicMethod("StructDefaultConstructor", type, Array.Empty<Type>(), type, true);
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var il = dm.GetILGenerator();
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var variable = il.DeclareLocal(type);
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il.Emit(FishTranspiler.LocalVariable(variable).Address());
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il.Emit(FishTranspiler.New(type));
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il.Emit(FishTranspiler.LocalVariable(variable));
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il.Emit(FishTranspiler.Return);
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return dm.CreateDelegate(typeof(Func<>).MakeGenericType(type));
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T New<T>()
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=> Create<T>.@new();
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T_result New<T_result, T_argument>(T_argument argument)
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=> Create<T_result, T_argument>.@new(argument);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T_result New<T_result, T1, T2>(T1 arg1, T2 arg2)
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=> Create<T_result, T1, T2>.@new(arg1, arg2);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T_result New<T_result, T1, T2, T3>(T1 arg1, T2 arg2, T3 arg3)
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=> Create<T_result, T1, T2, T3>.@new(arg1, arg2, arg3);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T_result New<T_result, T1, T2, T3, T4>(T1 arg1, T2 arg2, T3 arg3, T4 arg4)
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=> Create<T_result, T1, T2, T3, T4>.@new(arg1, arg2, arg3, arg4);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T_result New<T_result, T1, T2, T3, T4, T5>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5)
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=> Create<T_result, T1, T2, T3, T4, T5>.@new(arg1, arg2, arg3, arg4, arg5);
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private static class Create<T>
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{
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internal static Func<T> @new
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= typeof(T).IsValueType ? (Func<T>)MakeStructDefaultConstructor(typeof(T))
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: MatchingConstructor(typeof(T), Array.Empty<Type>())!.CreateDelegate<Func<T>>();
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}
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private static class Create<T_result, T_argument>
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{
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internal static Func<T_argument, T_result> @new
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= MatchingConstructor(typeof(T_result), new[] { typeof(T_argument) })!.CreateDelegate<Func<T_argument, T_result>>();
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}
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private static class Create<T_result, T1, T2>
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{
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internal static Func<T1, T2, T_result> @new
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= MatchingConstructor(typeof(T_result), new[] { typeof(T1), typeof(T2) })!.CreateDelegate<Func<T1, T2, T_result>>();
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}
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private static class Create<T_result, T1, T2, T3>
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{
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internal static Func<T1, T2, T3, T_result> @new
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= MatchingConstructor(typeof(T_result), new[] { typeof(T1), typeof(T2), typeof(T3) })!.CreateDelegate<Func<T1, T2, T3, T_result>>();
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}
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private static class Create<T_result, T1, T2, T3, T4>
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{
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internal static Func<T1, T2, T3, T4, T_result> @new
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= MatchingConstructor(typeof(T_result), new[] { typeof(T1), typeof(T2), typeof(T3), typeof(T4) })!.CreateDelegate<Func<T1, T2, T3, T4, T_result>>();
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}
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private static class Create<T_result, T1, T2, T3, T4, T5>
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{
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internal static Func<T1, T2, T3, T4, T5, T_result> @new
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= MatchingConstructor(typeof(T_result), new[] { typeof(T1), typeof(T2), typeof(T3), typeof(T4), typeof(T5) })!.CreateDelegate<Func<T1, T2, T3, T4, T5, T_result>>();
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}
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}
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