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#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion
#if NETFX
using System;using System.Collections.Generic;#if NET20
using Newtonsoft.Json.Utilities.LinqBridge;#endif
using System.Reflection;using System.Reflection.Emit;using Newtonsoft.Json.Serialization;using System.Globalization;
namespace Newtonsoft.Json.Utilities{ internal class DynamicReflectionDelegateFactory : ReflectionDelegateFactory { internal static DynamicReflectionDelegateFactory Instance { get; } = new DynamicReflectionDelegateFactory();
private static DynamicMethod CreateDynamicMethod(string name, Type returnType, Type[] parameterTypes, Type owner) { DynamicMethod dynamicMethod = !owner.IsInterface() ? new DynamicMethod(name, returnType, parameterTypes, owner, true) : new DynamicMethod(name, returnType, parameterTypes, owner.Module, true);
return dynamicMethod; }
public override ObjectConstructor<object> CreateParameterizedConstructor(MethodBase method) { DynamicMethod dynamicMethod = CreateDynamicMethod(method.ToString(), typeof(object), new[] { typeof(object[]) }, method.DeclaringType); ILGenerator generator = dynamicMethod.GetILGenerator();
GenerateCreateMethodCallIL(method, generator, 0); return (ObjectConstructor<object>)dynamicMethod.CreateDelegate(typeof(ObjectConstructor<object>)); }
public override MethodCall<T, object> CreateMethodCall<T>(MethodBase method) { DynamicMethod dynamicMethod = CreateDynamicMethod(method.ToString(), typeof(object), new[] { typeof(object), typeof(object[]) }, method.DeclaringType); ILGenerator generator = dynamicMethod.GetILGenerator();
GenerateCreateMethodCallIL(method, generator, 1);
return (MethodCall<T, object>)dynamicMethod.CreateDelegate(typeof(MethodCall<T, object>)); }
private void GenerateCreateMethodCallIL(MethodBase method, ILGenerator generator, int argsIndex) { ParameterInfo[] args = method.GetParameters();
Label argsOk = generator.DefineLabel();
// throw an error if the number of argument values doesn't match method parameters
generator.Emit(OpCodes.Ldarg, argsIndex); generator.Emit(OpCodes.Ldlen); generator.Emit(OpCodes.Ldc_I4, args.Length); generator.Emit(OpCodes.Beq, argsOk); generator.Emit(OpCodes.Newobj, typeof(TargetParameterCountException).GetConstructor(ReflectionUtils.EmptyTypes)); generator.Emit(OpCodes.Throw);
generator.MarkLabel(argsOk);
if (!method.IsConstructor && !method.IsStatic) { generator.PushInstance(method.DeclaringType); }
LocalBuilder localConvertible = generator.DeclareLocal(typeof(IConvertible)); LocalBuilder localObject = generator.DeclareLocal(typeof(object));
for (int i = 0; i < args.Length; i++) { ParameterInfo parameter = args[i]; Type parameterType = parameter.ParameterType;
if (parameterType.IsByRef) { parameterType = parameterType.GetElementType();
LocalBuilder localVariable = generator.DeclareLocal(parameterType);
// don't need to set variable for 'out' parameter
if (!parameter.IsOut) { generator.PushArrayInstance(argsIndex, i);
if (parameterType.IsValueType()) { Label skipSettingDefault = generator.DefineLabel(); Label finishedProcessingParameter = generator.DefineLabel();
// check if parameter is not null
generator.Emit(OpCodes.Brtrue_S, skipSettingDefault);
// parameter has no value, initialize to default
generator.Emit(OpCodes.Ldloca_S, localVariable); generator.Emit(OpCodes.Initobj, parameterType); generator.Emit(OpCodes.Br_S, finishedProcessingParameter);
// parameter has value, get value from array again and unbox and set to variable
generator.MarkLabel(skipSettingDefault); generator.PushArrayInstance(argsIndex, i); generator.UnboxIfNeeded(parameterType); generator.Emit(OpCodes.Stloc_S, localVariable);
// parameter finished, we out!
generator.MarkLabel(finishedProcessingParameter); } else { generator.UnboxIfNeeded(parameterType); generator.Emit(OpCodes.Stloc_S, localVariable); } }
generator.Emit(OpCodes.Ldloca_S, localVariable); } else if (parameterType.IsValueType()) { generator.PushArrayInstance(argsIndex, i); generator.Emit(OpCodes.Stloc_S, localObject);
// have to check that value type parameters aren't null
// otherwise they will error when unboxed
Label skipSettingDefault = generator.DefineLabel(); Label finishedProcessingParameter = generator.DefineLabel();
// check if parameter is not null
generator.Emit(OpCodes.Ldloc_S, localObject); generator.Emit(OpCodes.Brtrue_S, skipSettingDefault);
// parameter has no value, initialize to default
LocalBuilder localVariable = generator.DeclareLocal(parameterType); generator.Emit(OpCodes.Ldloca_S, localVariable); generator.Emit(OpCodes.Initobj, parameterType); generator.Emit(OpCodes.Ldloc_S, localVariable); generator.Emit(OpCodes.Br_S, finishedProcessingParameter);
// argument has value, try to convert it to parameter type
generator.MarkLabel(skipSettingDefault); if (parameterType.IsPrimitive()) { // for primitive types we need to handle type widening (e.g. short -> int)
MethodInfo toParameterTypeMethod = typeof(IConvertible) .GetMethod("To" + parameterType.Name, new[] { typeof(IFormatProvider) }); if (toParameterTypeMethod != null) { Label skipConvertible = generator.DefineLabel();
// check if argument type is an exact match for parameter type
// in this case we may use cheap unboxing instead
generator.Emit(OpCodes.Ldloc_S, localObject); generator.Emit(OpCodes.Isinst, parameterType); generator.Emit(OpCodes.Brtrue_S, skipConvertible);
// types don't match, check if argument implements IConvertible
generator.Emit(OpCodes.Ldloc_S, localObject); generator.Emit(OpCodes.Isinst, typeof(IConvertible)); generator.Emit(OpCodes.Stloc_S, localConvertible); generator.Emit(OpCodes.Ldloc_S, localConvertible); generator.Emit(OpCodes.Brfalse_S, skipConvertible);
// convert argument to parameter type
generator.Emit(OpCodes.Ldloc_S, localConvertible); generator.Emit(OpCodes.Ldnull); generator.Emit(OpCodes.Callvirt, toParameterTypeMethod); generator.Emit(OpCodes.Br_S, finishedProcessingParameter);
generator.MarkLabel(skipConvertible); } }
// we got here because either argument type matches parameter (conversion will succeed),
// or argument type doesn't match parameter, but we're out of options (conversion will fail)
generator.Emit(OpCodes.Ldloc_S, localObject);
generator.UnboxIfNeeded(parameterType); // parameter finished, we out!
generator.MarkLabel(finishedProcessingParameter); } else { generator.PushArrayInstance(argsIndex, i);
generator.UnboxIfNeeded(parameterType); } }
if (method.IsConstructor) { generator.Emit(OpCodes.Newobj, (ConstructorInfo)method); } else { generator.CallMethod((MethodInfo)method); }
Type returnType = method.IsConstructor ? method.DeclaringType : ((MethodInfo)method).ReturnType;
if (returnType != typeof(void)) { generator.BoxIfNeeded(returnType); } else { generator.Emit(OpCodes.Ldnull); }
generator.Return(); }
public override Func<T> CreateDefaultConstructor<T>(Type type) { DynamicMethod dynamicMethod = CreateDynamicMethod("Create" + type.FullName, typeof(T), ReflectionUtils.EmptyTypes, type); dynamicMethod.InitLocals = true; ILGenerator generator = dynamicMethod.GetILGenerator();
GenerateCreateDefaultConstructorIL(type, generator, typeof(T));
return (Func<T>)dynamicMethod.CreateDelegate(typeof(Func<T>)); }
private void GenerateCreateDefaultConstructorIL(Type type, ILGenerator generator, Type delegateType) { if (type.IsValueType()) { generator.DeclareLocal(type); generator.Emit(OpCodes.Ldloc_0);
// only need to box if the delegate isn't returning the value type
if (type != delegateType) { generator.Emit(OpCodes.Box, type); } } else { ConstructorInfo constructorInfo = type.GetConstructor(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance, null, ReflectionUtils.EmptyTypes, null);
if (constructorInfo == null) { throw new ArgumentException("Could not get constructor for {0}.".FormatWith(CultureInfo.InvariantCulture, type)); }
generator.Emit(OpCodes.Newobj, constructorInfo); }
generator.Return(); }
public override Func<T, object> CreateGet<T>(PropertyInfo propertyInfo) { DynamicMethod dynamicMethod = CreateDynamicMethod("Get" + propertyInfo.Name, typeof(object), new[] { typeof(T) }, propertyInfo.DeclaringType); ILGenerator generator = dynamicMethod.GetILGenerator();
GenerateCreateGetPropertyIL(propertyInfo, generator);
return (Func<T, object>)dynamicMethod.CreateDelegate(typeof(Func<T, object>)); }
private void GenerateCreateGetPropertyIL(PropertyInfo propertyInfo, ILGenerator generator) { MethodInfo getMethod = propertyInfo.GetGetMethod(true); if (getMethod == null) { throw new ArgumentException("Property '{0}' does not have a getter.".FormatWith(CultureInfo.InvariantCulture, propertyInfo.Name)); }
if (!getMethod.IsStatic) { generator.PushInstance(propertyInfo.DeclaringType); }
generator.CallMethod(getMethod); generator.BoxIfNeeded(propertyInfo.PropertyType); generator.Return(); }
public override Func<T, object> CreateGet<T>(FieldInfo fieldInfo) { if (fieldInfo.IsLiteral) { object constantValue = fieldInfo.GetValue(null); Func<T, object> getter = o => constantValue; return getter; }
DynamicMethod dynamicMethod = CreateDynamicMethod("Get" + fieldInfo.Name, typeof(T), new[] { typeof(object) }, fieldInfo.DeclaringType); ILGenerator generator = dynamicMethod.GetILGenerator();
GenerateCreateGetFieldIL(fieldInfo, generator);
return (Func<T, object>)dynamicMethod.CreateDelegate(typeof(Func<T, object>)); }
private void GenerateCreateGetFieldIL(FieldInfo fieldInfo, ILGenerator generator) { if (!fieldInfo.IsStatic) { generator.PushInstance(fieldInfo.DeclaringType); generator.Emit(OpCodes.Ldfld, fieldInfo); } else { generator.Emit(OpCodes.Ldsfld, fieldInfo); }
generator.BoxIfNeeded(fieldInfo.FieldType); generator.Return(); }
public override Action<T, object> CreateSet<T>(FieldInfo fieldInfo) { DynamicMethod dynamicMethod = CreateDynamicMethod("Set" + fieldInfo.Name, null, new[] { typeof(T), typeof(object) }, fieldInfo.DeclaringType); ILGenerator generator = dynamicMethod.GetILGenerator();
GenerateCreateSetFieldIL(fieldInfo, generator);
return (Action<T, object>)dynamicMethod.CreateDelegate(typeof(Action<T, object>)); }
internal static void GenerateCreateSetFieldIL(FieldInfo fieldInfo, ILGenerator generator) { if (!fieldInfo.IsStatic) { generator.PushInstance(fieldInfo.DeclaringType); }
generator.Emit(OpCodes.Ldarg_1); generator.UnboxIfNeeded(fieldInfo.FieldType);
if (!fieldInfo.IsStatic) { generator.Emit(OpCodes.Stfld, fieldInfo); } else { generator.Emit(OpCodes.Stsfld, fieldInfo); }
generator.Return(); }
public override Action<T, object> CreateSet<T>(PropertyInfo propertyInfo) { DynamicMethod dynamicMethod = CreateDynamicMethod("Set" + propertyInfo.Name, null, new[] { typeof(T), typeof(object) }, propertyInfo.DeclaringType); ILGenerator generator = dynamicMethod.GetILGenerator();
GenerateCreateSetPropertyIL(propertyInfo, generator);
return (Action<T, object>)dynamicMethod.CreateDelegate(typeof(Action<T, object>)); }
internal static void GenerateCreateSetPropertyIL(PropertyInfo propertyInfo, ILGenerator generator) { MethodInfo setMethod = propertyInfo.GetSetMethod(true); if (!setMethod.IsStatic) { generator.PushInstance(propertyInfo.DeclaringType); }
generator.Emit(OpCodes.Ldarg_1); generator.UnboxIfNeeded(propertyInfo.PropertyType); generator.CallMethod(setMethod); generator.Return(); } }}
#endif
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