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FieldInterceptorProxyBuilder.cs
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using System;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime.Serialization;
using NHibernate.Intercept;
using NHibernate.Util;
namespace NHibernate.Proxy
{
internal static class FieldInterceptorProxyBuilder
{
private const MethodAttributes constructorAttributes =
MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.RTSpecialName;
private static readonly System.Type FieldInterceptorAccessorType = typeof(IFieldInterceptorAccessor);
private static readonly PropertyInfo AccessorTypeFieldInterceptorProperty =
FieldInterceptorAccessorType.GetProperty(nameof(IFieldInterceptorAccessor.FieldInterceptor));
private static readonly System.Type FieldInterceptorType = typeof(IFieldInterceptor);
// 6.0 TODO: Remove
private static readonly System.Type FieldInterceptorExtensionsType = typeof(FieldInterceptorExtensions);
#pragma warning disable 618
private static readonly MethodInfo FieldInterceptorInterceptMethod = FieldInterceptorType.GetMethod(nameof(IFieldInterceptor.Intercept));
#pragma warning restore 618
private static readonly MethodInfo FieldInterceptorMarkDirtyMethod = FieldInterceptorType.GetMethod(nameof(IFieldInterceptor.MarkDirty));
// 6.0 TODO: Remove and replace usages with FieldInterceptorInterceptMethod
private static readonly MethodInfo FieldInterceptorInterceptExtensionMethod = FieldInterceptorExtensionsType.GetMethod(nameof(FieldInterceptorExtensions.Intercept));
private static readonly System.Type AbstractFieldInterceptorType = typeof(AbstractFieldInterceptor);
private static readonly FieldInfo AbstractFieldInterceptorInvokeImplementationField =
AbstractFieldInterceptorType.GetField(nameof(AbstractFieldInterceptor.InvokeImplementation));
private static readonly System.Type FieldInterceptorObjectReferenceType = typeof(FieldInterceptorObjectReference);
private static readonly ConstructorInfo FieldInterceptorObjectReferenceConstructor =
FieldInterceptorObjectReferenceType.GetConstructor(new[] { typeof(NHibernateProxyFactoryInfo), typeof(IFieldInterceptor) });
private static readonly MethodInfo FieldInterceptorObjectReferenceGetBaseDataMethod =
FieldInterceptorObjectReferenceType.GetMethod(nameof(FieldInterceptorObjectReference.GetBaseData));
private static readonly MethodInfo FieldInterceptorObjectReferenceSetNoAdditionalDataMethod =
FieldInterceptorObjectReferenceType.GetMethod(nameof(FieldInterceptorObjectReference.SetNoAdditionalData));
private static readonly ConstructorInfo InvalidOperationWithMessageConstructor =
typeof(InvalidOperationException).GetConstructor(new[] { typeof(string) });
public static TypeInfo CreateProxyType(System.Type baseType)
{
if (baseType.IsInterface)
{
throw new ArgumentException(
$"Field interceptor proxy does not support being build on an interface baseType ({baseType.FullName}).",
nameof(baseType));
}
// Avoid having a suffix ending with "Proxy", for disambiguation with INHibernateProxy proxies
var typeName = $"{baseType.Name}ProxyForFieldInterceptor";
var assemblyName = $"{typeName}Assembly";
var moduleName = $"{typeName}Module";
var name = new AssemblyName(assemblyName);
var assemblyBuilder = ProxyBuilderHelper.DefineDynamicAssembly(AppDomain.CurrentDomain, name);
#if NETFX || NETCOREAPP2_0
if (!baseType.IsVisible)
ProxyBuilderHelper.GenerateInstanceOfIgnoresAccessChecksToAttribute(assemblyBuilder, baseType.Assembly.GetName().Name);
#endif
var moduleBuilder = ProxyBuilderHelper.DefineDynamicModule(assemblyBuilder, moduleName);
const TypeAttributes typeAttributes = TypeAttributes.AutoClass | TypeAttributes.Class | TypeAttributes.Public | TypeAttributes.BeforeFieldInit;
var interfaces = new[]
{
typeof(IFieldInterceptorAccessor),
typeof(ISerializable)
};
var typeBuilder = moduleBuilder.DefineType(typeName, typeAttributes, baseType, interfaces);
var fieldInterceptorField = typeBuilder.DefineField("__fieldInterceptor", FieldInterceptorType, FieldAttributes.Private);
var proxyInfoField = typeBuilder.DefineField("__proxyInfo", typeof(NHibernateProxyFactoryInfo), FieldAttributes.Private);
ImplementConstructor(typeBuilder, baseType, proxyInfoField);
foreach (var method in ProxyBuilderHelper.GetProxiableMethods(baseType))
{
CreateProxiedMethod(typeBuilder, method, fieldInterceptorField);
}
ImplementIFieldInterceptorAccessor(typeBuilder, fieldInterceptorField);
ImplementISerializable(typeBuilder, proxyInfoField, fieldInterceptorField, baseType);
var proxyType = typeBuilder.CreateTypeInfo();
ProxyBuilderHelper.Save(assemblyBuilder);
return proxyType;
}
private static void CreateProxiedMethod(TypeBuilder typeBuilder, MethodInfo method, FieldInfo fieldInterceptorField)
{
if (ReflectHelper.IsPropertyGet(method))
{
ImplementGet(typeBuilder, method, fieldInterceptorField);
}
else if (ReflectHelper.IsPropertySet(method))
{
ImplementSet(typeBuilder, method, fieldInterceptorField);
}
// else skip
// The field interceptor proxy stores the entity data in its base implementation (unlike
// the NHibernateProxy which delegates the entity data to an instance of the entity).
// As such, it only needs to intercept the properties, and can let the other methods be handled
// by its base implementation.
}
private static void ImplementConstructor(TypeBuilder typeBuilder, System.Type parentType, FieldInfo proxyInfoField)
{
var constructor = typeBuilder.DefineConstructor(constructorAttributes, CallingConventions.Standard, new[] { typeof(NHibernateProxyFactoryInfo) });
constructor.SetImplementationFlags(MethodImplAttributes.IL | MethodImplAttributes.Managed);
var IL = constructor.GetILGenerator();
ProxyBuilderHelper.CallDefaultBaseConstructor(IL, parentType);
// __proxyInfo == proxyInfo;
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Ldarg_1);
IL.Emit(OpCodes.Stfld, proxyInfoField);
IL.Emit(OpCodes.Ret);
}
private static void ImplementISerializable(
TypeBuilder typeBuilder,
FieldInfo proxyInfoField,
FieldInfo fieldInterceptorField,
System.Type baseType)
{
ProxyBuilderHelper.MakeProxySerializable(typeBuilder);
ImplementDeserializationConstructor(typeBuilder, baseType);
ImplementGetObjectData(typeBuilder, proxyInfoField, fieldInterceptorField, baseType);
}
private static void ImplementDeserializationConstructor(TypeBuilder typeBuilder, System.Type parentType)
{
var parameterTypes = new[] { typeof (SerializationInfo), typeof (StreamingContext) };
var constructor = typeBuilder.DefineConstructor(constructorAttributes, CallingConventions.Standard, parameterTypes);
constructor.SetImplementationFlags(MethodImplAttributes.IL | MethodImplAttributes.Managed);
var IL = constructor.GetILGenerator();
if (typeof(ISerializable).IsAssignableFrom(parentType))
{
var baseConstructor = parentType.GetConstructor(
BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public,
null,
parameterTypes,
null);
if (baseConstructor == null)
{
// Throw new InvalidOperationException(<message>);
IL.Emit(
OpCodes.Ldstr,
$"Proxy for class {parentType.FullName} cannot be deserialized because the class implements " +
$"{nameof(ISerializable)} without having a deserialization constructor (see CA2229).");
IL.Emit(OpCodes.Newobj, InvalidOperationWithMessageConstructor);
IL.Emit(OpCodes.Throw);
}
else
{
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Ldarg_1);
IL.Emit(OpCodes.Ldarg_2);
IL.Emit(OpCodes.Call, baseConstructor);
}
}
else
ProxyBuilderHelper.CallDefaultBaseConstructor(IL, parentType);
// Everything else is done in FieldInterceptorObjectReference.
IL.Emit(OpCodes.Ret);
}
private static void ImplementGetObjectData(TypeBuilder typeBuilder, FieldInfo proxyInfoField, FieldInfo fieldInterceptorField, System.Type parentType)
{
var methodBuilder = ProxyBuilderHelper.GetObjectDataMethodBuilder(typeBuilder);
var IL = methodBuilder.GetILGenerator();
IL.DeclareLocal(FieldInterceptorObjectReferenceType);
// info.SetType(<FieldInterceptorObjectReferenceType>);
IL.Emit(OpCodes.Ldarg_1);
IL.Emit(OpCodes.Ldtoken, FieldInterceptorObjectReferenceType);
IL.Emit(OpCodes.Call, ReflectionCache.TypeMethods.GetTypeFromHandle);
IL.Emit(OpCodes.Callvirt, ProxyBuilderHelper.SerializationInfoSetTypeMethod);
// var objectReference = new FieldInterceptorObjectReference(this.__proxyInfo, this.__fieldInterceptor));
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Ldfld, proxyInfoField);
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Ldfld, fieldInterceptorField);
IL.Emit(OpCodes.Newobj, FieldInterceptorObjectReferenceConstructor);
IL.Emit(OpCodes.Stloc_0);
// objectReference.GetObjectData(info, context);
IL.Emit(OpCodes.Ldloc_0);
IL.Emit(OpCodes.Ldarg_1);
IL.Emit(OpCodes.Ldarg_2);
IL.Emit(OpCodes.Callvirt, ProxyBuilderHelper.SerializableGetObjectDataMethod);
if (typeof(ISerializable).IsAssignableFrom(parentType))
{
var parentGetObjectData = parentType.GetMethod(
nameof(ISerializable.GetObjectData),
BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance,
null,
new[] { typeof (SerializationInfo), typeof (StreamingContext) },
null);
if (parentGetObjectData == null)
{
// Throw new InvalidOperationException(<message>);
IL.Emit(
OpCodes.Ldstr,
$"Proxy for class {parentType.FullName} cannot be serialized because the class implements " +
$"{nameof(ISerializable)} without having a public or protected GetObjectData.");
IL.Emit(OpCodes.Newobj, InvalidOperationWithMessageConstructor);
IL.Emit(OpCodes.Throw);
typeBuilder.DefineMethodOverride(methodBuilder, ProxyBuilderHelper.SerializableGetObjectDataMethod);
return;
}
// base.GetObjectData(info, context);
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Ldarg_1);
IL.Emit(OpCodes.Ldarg_2);
IL.Emit(OpCodes.Call, parentGetObjectData);
// objectReference.SetNoAdditionalData(info);
IL.Emit(OpCodes.Ldloc_0);
IL.Emit(OpCodes.Ldarg_1);
IL.Emit(OpCodes.Callvirt, FieldInterceptorObjectReferenceSetNoAdditionalDataMethod);
}
else
{
// objectReference.SerializeBaseData(info, context, this, <parentType>);
IL.Emit(OpCodes.Ldloc_0);
IL.Emit(OpCodes.Ldarg_1);
IL.Emit(OpCodes.Ldarg_2);
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Ldtoken, parentType);
IL.Emit(OpCodes.Call, ReflectionCache.TypeMethods.GetTypeFromHandle);
IL.Emit(OpCodes.Callvirt, FieldInterceptorObjectReferenceGetBaseDataMethod);
}
IL.Emit(OpCodes.Ret);
typeBuilder.DefineMethodOverride(methodBuilder, ProxyBuilderHelper.SerializableGetObjectDataMethod);
}
private static void ImplementIFieldInterceptorAccessor(TypeBuilder typeBuilder, FieldInfo fieldInterceptorField)
{
ImplementGetFieldInterceptor(typeBuilder, fieldInterceptorField);
ImplementSetFieldInterceptor(typeBuilder, fieldInterceptorField);
}
private static void ImplementGetFieldInterceptor(TypeBuilder typeBuilder, FieldInfo fieldInterceptorField)
{
// get { return this.__fieldInterceptor; }
const MethodAttributes attributes =
MethodAttributes.Private | MethodAttributes.Final | MethodAttributes.HideBySig |
MethodAttributes.SpecialName | MethodAttributes.NewSlot | MethodAttributes.Virtual;
var getMethod = typeBuilder.DefineMethod(
$"{FieldInterceptorAccessorType.FullName}.get_{nameof(INHibernateProxy.HibernateLazyInitializer)}",
attributes, CallingConventions.HasThis, FieldInterceptorType, System.Type.EmptyTypes);
getMethod.SetImplementationFlags(MethodImplAttributes.Managed | MethodImplAttributes.IL);
var IL = getMethod.GetILGenerator();
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Ldfld, fieldInterceptorField);
IL.Emit(OpCodes.Ret);
typeBuilder.DefineMethodOverride(getMethod, AccessorTypeFieldInterceptorProperty.GetMethod);
}
private static void ImplementSetFieldInterceptor(TypeBuilder typeBuilder, FieldInfo fieldInterceptorField)
{
// set { this.__fieldInterceptor = value; }
const MethodAttributes attributes =
MethodAttributes.Private | MethodAttributes.Final | MethodAttributes.HideBySig |
MethodAttributes.SpecialName | MethodAttributes.NewSlot | MethodAttributes.Virtual;
var setMethod = typeBuilder.DefineMethod(
$"{FieldInterceptorAccessorType.FullName}.set_{nameof(INHibernateProxy.HibernateLazyInitializer)}",
attributes, CallingConventions.HasThis, null, new[] {FieldInterceptorType});
setMethod.SetImplementationFlags(MethodImplAttributes.Managed | MethodImplAttributes.IL);
var IL = setMethod.GetILGenerator();
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Ldarg_1);
IL.Emit(OpCodes.Stfld, fieldInterceptorField);
IL.Emit(OpCodes.Ret);
typeBuilder.DefineMethodOverride(setMethod, AccessorTypeFieldInterceptorProperty.SetMethod);
}
private static void ImplementGet(TypeBuilder typeBuilder, MethodInfo getter, FieldInfo fieldInterceptorField)
{
/*
var propValue = base.<getter>();
if (this.__fieldInterceptor != null)
{
var result = this.__fieldInterceptor.Intercept(this, <ReflectHelper.GetPropertyName(getter)>, propValue);
if (result != AbstractFieldInterceptor.InvokeImplementation)
{
return (<getter.ReturnType>)result;
}
}
return propValue;
*/
var methodOverride = ProxyBuilderHelper.GenerateMethodSignature(getter.Name, getter, typeBuilder);
var IL = methodOverride.GetILGenerator();
IL.DeclareLocal(getter.ReturnType); // propValue
IL.DeclareLocal(typeof(object)); // result
// var propValue = base.<getter>();
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Call, getter);
IL.Emit(OpCodes.Stloc_0);
// if (this.__fieldInterceptor != null)
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Ldfld, fieldInterceptorField);
IL.Emit(OpCodes.Ldnull);
var skipInterceptor = IL.DefineLabel();
IL.Emit(OpCodes.Beq, skipInterceptor);
// var result = this.__fieldInterceptor.Intercept(this, <ReflectHelper.GetPropertyName(getter)>, propValue);
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Ldfld, fieldInterceptorField);
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Ldstr, ReflectHelper.GetPropertyName(getter));
IL.Emit(OpCodes.Ldloc_0);
if (getter.ReturnType.IsValueType)
IL.Emit(OpCodes.Box, getter.ReturnType);
IL.Emit(OpCodes.Callvirt, FieldInterceptorInterceptMethod);
IL.Emit(OpCodes.Stloc_1);
// if (result != AbstractFieldInterceptor.InvokeImplementation)
IL.Emit(OpCodes.Ldloc_1);
IL.Emit(OpCodes.Ldsfld, AbstractFieldInterceptorInvokeImplementationField);
var skipInterceptorResult = IL.DefineLabel();
IL.Emit(OpCodes.Beq, skipInterceptorResult);
// return (<getter.ReturnType>)result;
IL.Emit(OpCodes.Ldloc_1);
IL.Emit(OpCodes.Unbox_Any, getter.ReturnType);
IL.Emit(OpCodes.Ret);
// end if (result != AbstractFieldInterceptor.InvokeImplementation)
IL.MarkLabel(skipInterceptorResult);
// end if (this.__fieldInterceptor != null)
IL.MarkLabel(skipInterceptor);
// return propValue;
IL.Emit(OpCodes.Ldloc_0);
IL.Emit(OpCodes.Ret);
typeBuilder.DefineMethodOverride(methodOverride, getter);
}
private static void ImplementSet(TypeBuilder typeBuilder, MethodInfo setter, FieldInfo fieldInterceptorField)
{
/*
if (this.__fieldInterceptor != null)
{
this.__fieldInterceptor.MarkDirty();
this.__fieldInterceptor.Intercept(this, <ReflectHelper.GetPropertyName(setter)>, value, true);
}
base.<setter>(value);
*/
var methodOverride = ProxyBuilderHelper.GenerateMethodSignature(setter.Name, setter, typeBuilder);
var IL = methodOverride.GetILGenerator();
// if (this.__fieldInterceptor != null)
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Ldfld, fieldInterceptorField);
IL.Emit(OpCodes.Ldnull);
var skipInterceptor = IL.DefineLabel();
IL.Emit(OpCodes.Beq, skipInterceptor);
// this.__fieldInterceptor.MarkDirty();
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Ldfld, fieldInterceptorField);
IL.Emit(OpCodes.Callvirt, FieldInterceptorMarkDirtyMethod);
// this.__fieldInterceptor.Intercept(this, <ReflectHelper.GetPropertyName(setter)>, propValue, true);
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Ldfld, fieldInterceptorField);
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Ldstr, ReflectHelper.GetPropertyName(setter));
IL.Emit(OpCodes.Ldarg_1);
var propertyType = setter.GetParameters()[0].ParameterType;
if (propertyType.IsValueType)
IL.Emit(OpCodes.Box, propertyType);
IL.Emit(OpCodes.Ldc_I4_1);
IL.EmitCall(OpCodes.Call, FieldInterceptorInterceptExtensionMethod, null);
IL.Emit(OpCodes.Pop);
// end if (this.__fieldInterceptor != null)
IL.MarkLabel(skipInterceptor);
// base.<setter>(value);
IL.Emit(OpCodes.Ldarg_0);
IL.Emit(OpCodes.Ldarg_1);
IL.Emit(OpCodes.Call, setter);
IL.Emit(OpCodes.Ret);
typeBuilder.DefineMethodOverride(methodOverride, setter);
}
}
}