DynamicReflectionDelegateFactory
using Newtonsoft.Json.Serialization;
using System;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime.CompilerServices;
namespace Newtonsoft.Json.Utilities
{
[System.Runtime.CompilerServices.NullableContext(1)]
[System.Runtime.CompilerServices.Nullable(0)]
internal class DynamicReflectionDelegateFactory : ReflectionDelegateFactory
{
internal static DynamicReflectionDelegateFactory Instance { get; } = new DynamicReflectionDelegateFactory();
[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Newtonsoft.Json relies on dynamically creating types that may not be available with Ahead of Time compilation.")]
private static DynamicMethod CreateDynamicMethod(string name, [System.Runtime.CompilerServices.Nullable(2)] Type returnType, Type[] parameterTypes, Type owner)
{
if (owner.IsInterface())
return new DynamicMethod(name, returnType, parameterTypes, owner.Module, true);
return new DynamicMethod(name, returnType, parameterTypes, owner, true);
}
[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Newtonsoft.Json relies on dynamically creating types that may not be available with Ahead of Time compilation.")]
public override ObjectConstructor<object> CreateParameterizedConstructor(MethodBase method)
{
DynamicMethod dynamicMethod = CreateDynamicMethod(method.ToString(), typeof(object), new Type[1] {
typeof(object[])
}, method.DeclaringType);
ILGenerator iLGenerator = dynamicMethod.GetILGenerator();
GenerateCreateMethodCallIL(method, iLGenerator, 0);
return (ObjectConstructor<object>)dynamicMethod.CreateDelegate(typeof(ObjectConstructor<object>));
}
[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Newtonsoft.Json relies on dynamically creating types that may not be available with Ahead of Time compilation.")]
[return: System.Runtime.CompilerServices.Nullable(new byte[] {
1,
1,
2
})]
public override MethodCall<T, object> CreateMethodCall<[System.Runtime.CompilerServices.Nullable(2)] T>(MethodBase method)
{
DynamicMethod dynamicMethod = CreateDynamicMethod(method.ToString(), typeof(object), new Type[2] {
typeof(object),
typeof(object[])
}, method.DeclaringType);
ILGenerator iLGenerator = dynamicMethod.GetILGenerator();
GenerateCreateMethodCallIL(method, iLGenerator, 1);
return (MethodCall<T, object>)dynamicMethod.CreateDelegate(typeof(MethodCall<T, object>));
}
private void GenerateCreateMethodCallIL(MethodBase method, ILGenerator generator, int argsIndex)
{
ParameterInfo[] parameters = method.GetParameters();
Label label = generator.DefineLabel();
generator.Emit(OpCodes.Ldarg, argsIndex);
generator.Emit(OpCodes.Ldlen);
generator.Emit(OpCodes.Ldc_I4, parameters.Length);
generator.Emit(OpCodes.Beq, label);
generator.Emit(OpCodes.Newobj, typeof(TargetParameterCountException).GetConstructor(ReflectionUtils.EmptyTypes));
generator.Emit(OpCodes.Throw);
generator.MarkLabel(label);
if (!method.IsConstructor && !method.IsStatic)
generator.PushInstance(method.DeclaringType);
LocalBuilder local = generator.DeclareLocal(typeof(IConvertible));
LocalBuilder local2 = generator.DeclareLocal(typeof(object));
OpCode opcode = (parameters.Length < 256) ? OpCodes.Ldloca_S : OpCodes.Ldloca;
OpCode opcode2 = (parameters.Length < 256) ? OpCodes.Ldloc_S : OpCodes.Ldloc;
for (int i = 0; i < parameters.Length; i++) {
ParameterInfo parameterInfo = parameters[i];
Type parameterType = parameterInfo.ParameterType;
if (parameterType.IsByRef) {
parameterType = parameterType.GetElementType();
LocalBuilder local3 = generator.DeclareLocal(parameterType);
if (!parameterInfo.IsOut) {
generator.PushArrayInstance(argsIndex, i);
if (parameterType.IsValueType()) {
Label label2 = generator.DefineLabel();
Label label3 = generator.DefineLabel();
generator.Emit(OpCodes.Brtrue_S, label2);
generator.Emit(opcode, local3);
generator.Emit(OpCodes.Initobj, parameterType);
generator.Emit(OpCodes.Br_S, label3);
generator.MarkLabel(label2);
generator.PushArrayInstance(argsIndex, i);
generator.UnboxIfNeeded(parameterType);
generator.Emit(OpCodes.Stloc_S, local3);
generator.MarkLabel(label3);
} else {
generator.UnboxIfNeeded(parameterType);
generator.Emit(OpCodes.Stloc_S, local3);
}
}
generator.Emit(opcode, local3);
} else if (parameterType.IsValueType()) {
generator.PushArrayInstance(argsIndex, i);
generator.Emit(OpCodes.Stloc_S, local2);
Label label4 = generator.DefineLabel();
Label label5 = generator.DefineLabel();
generator.Emit(OpCodes.Ldloc_S, local2);
generator.Emit(OpCodes.Brtrue_S, label4);
LocalBuilder local4 = generator.DeclareLocal(parameterType);
generator.Emit(opcode, local4);
generator.Emit(OpCodes.Initobj, parameterType);
generator.Emit(opcode2, local4);
generator.Emit(OpCodes.Br_S, label5);
generator.MarkLabel(label4);
if (parameterType.IsPrimitive()) {
MethodInfo method2 = typeof(IConvertible).GetMethod("To" + parameterType.Name, new Type[1] {
typeof(IFormatProvider)
});
if (method2 != (MethodInfo)null) {
Label label6 = generator.DefineLabel();
generator.Emit(OpCodes.Ldloc_S, local2);
generator.Emit(OpCodes.Isinst, parameterType);
generator.Emit(OpCodes.Brtrue_S, label6);
generator.Emit(OpCodes.Ldloc_S, local2);
generator.Emit(OpCodes.Isinst, typeof(IConvertible));
generator.Emit(OpCodes.Stloc_S, local);
generator.Emit(OpCodes.Ldloc_S, local);
generator.Emit(OpCodes.Brfalse_S, label6);
generator.Emit(OpCodes.Ldloc_S, local);
generator.Emit(OpCodes.Ldnull);
generator.Emit(OpCodes.Callvirt, method2);
generator.Emit(OpCodes.Br_S, label5);
generator.MarkLabel(label6);
}
}
generator.Emit(OpCodes.Ldloc_S, local2);
generator.UnboxIfNeeded(parameterType);
generator.MarkLabel(label5);
} else {
generator.PushArrayInstance(argsIndex, i);
generator.UnboxIfNeeded(parameterType);
}
}
if (method.IsConstructor)
generator.Emit(OpCodes.Newobj, (ConstructorInfo)method);
else
generator.CallMethod((MethodInfo)method);
Type type = method.IsConstructor ? method.DeclaringType : ((MethodInfo)method).ReturnType;
if (type != typeof(void))
generator.BoxIfNeeded(type);
else
generator.Emit(OpCodes.Ldnull);
generator.Return();
}
[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Newtonsoft.Json relies on dynamically creating types that may not be available with Ahead of Time compilation.")]
public override Func<T> CreateDefaultConstructor<[System.Runtime.CompilerServices.Nullable(2)] T>([DynamicallyAccessedMembers((DynamicallyAccessedMemberTypes)7)] Type type)
{
DynamicMethod dynamicMethod = CreateDynamicMethod("Create" + type.FullName, typeof(T), ReflectionUtils.EmptyTypes, type);
dynamicMethod.InitLocals = true;
ILGenerator iLGenerator = dynamicMethod.GetILGenerator();
GenerateCreateDefaultConstructorIL(type, iLGenerator, typeof(T));
return (Func<T>)dynamicMethod.CreateDelegate(typeof(Func<T>));
}
private void GenerateCreateDefaultConstructorIL([DynamicallyAccessedMembers((DynamicallyAccessedMemberTypes)7)] Type type, ILGenerator generator, Type delegateType)
{
if (type.IsValueType()) {
generator.DeclareLocal(type);
generator.Emit(OpCodes.Ldloc_0);
if (type != delegateType)
generator.Emit(OpCodes.Box, type);
} else {
ConstructorInfo constructor = type.GetConstructor(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, null, ReflectionUtils.EmptyTypes, null);
if (constructor == (ConstructorInfo)null)
throw new ArgumentException("Could not get constructor for {0}.".FormatWith(CultureInfo.InvariantCulture, type));
generator.Emit(OpCodes.Newobj, constructor);
}
generator.Return();
}
[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Newtonsoft.Json relies on dynamically creating types that may not be available with Ahead of Time compilation.")]
[return: System.Runtime.CompilerServices.Nullable(new byte[] {
1,
1,
2
})]
public override Func<T, object> CreateGet<[System.Runtime.CompilerServices.Nullable(2)] T>(PropertyInfo propertyInfo)
{
DynamicMethod dynamicMethod = CreateDynamicMethod("Get" + propertyInfo.Name, typeof(object), new Type[1] {
typeof(T)
}, propertyInfo.DeclaringType);
ILGenerator iLGenerator = dynamicMethod.GetILGenerator();
GenerateCreateGetPropertyIL(propertyInfo, iLGenerator);
return (Func<T, object>)dynamicMethod.CreateDelegate(typeof(Func<T, object>));
}
private void GenerateCreateGetPropertyIL(PropertyInfo propertyInfo, ILGenerator generator)
{
MethodInfo getMethod = propertyInfo.GetGetMethod(true);
if (getMethod == (MethodInfo)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();
}
[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Newtonsoft.Json relies on dynamically creating types that may not be available with Ahead of Time compilation.")]
[return: System.Runtime.CompilerServices.Nullable(new byte[] {
1,
1,
2
})]
public override Func<T, object> CreateGet<[System.Runtime.CompilerServices.Nullable(2)] T>(FieldInfo fieldInfo)
{
if (fieldInfo.IsLiteral) {
object constantValue = fieldInfo.GetValue(null);
return (T o) => constantValue;
}
DynamicMethod dynamicMethod = CreateDynamicMethod("Get" + fieldInfo.Name, typeof(T), new Type[1] {
typeof(object)
}, fieldInfo.DeclaringType);
ILGenerator iLGenerator = dynamicMethod.GetILGenerator();
GenerateCreateGetFieldIL(fieldInfo, iLGenerator);
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();
}
[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Newtonsoft.Json relies on dynamically creating types that may not be available with Ahead of Time compilation.")]
[return: System.Runtime.CompilerServices.Nullable(new byte[] {
1,
1,
2
})]
public override Action<T, object> CreateSet<[System.Runtime.CompilerServices.Nullable(2)] T>(FieldInfo fieldInfo)
{
DynamicMethod dynamicMethod = CreateDynamicMethod("Set" + fieldInfo.Name, null, new Type[2] {
typeof(T),
typeof(object)
}, fieldInfo.DeclaringType);
ILGenerator iLGenerator = dynamicMethod.GetILGenerator();
GenerateCreateSetFieldIL(fieldInfo, iLGenerator);
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();
}
[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Newtonsoft.Json relies on dynamically creating types that may not be available with Ahead of Time compilation.")]
[return: System.Runtime.CompilerServices.Nullable(new byte[] {
1,
1,
2
})]
public override Action<T, object> CreateSet<[System.Runtime.CompilerServices.Nullable(2)] T>(PropertyInfo propertyInfo)
{
DynamicMethod dynamicMethod = CreateDynamicMethod("Set" + propertyInfo.Name, null, new Type[2] {
typeof(T),
typeof(object)
}, propertyInfo.DeclaringType);
ILGenerator iLGenerator = dynamicMethod.GetILGenerator();
GenerateCreateSetPropertyIL(propertyInfo, iLGenerator);
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();
}
}
}