public void NestedInterface()
{
ClassEmitter outerEmitter = new ClassEmitter(generator.ProxyBuilder.ModuleScope, "IOuter", null, Type.EmptyTypes,
TypeAttributes.Interface | TypeAttributes.Abstract | TypeAttributes.Public, false);
NestedClassEmitter innerEmitter = new NestedClassEmitter(outerEmitter, "IInner",
TypeAttributes.Interface | TypeAttributes.Abstract | TypeAttributes.NestedPublic, null, Type.EmptyTypes);
innerEmitter.CreateMethod("MyMethod", MethodAttributes.Public | MethodAttributes.Abstract | MethodAttributes.Virtual,
typeof(void), Type.EmptyTypes);
Type inner = innerEmitter.BuildType();
Type outer = outerEmitter.BuildType();
Assert.IsTrue(inner.IsInterface);
MethodInfo method = inner.GetMethod("MyMethod");
Assert.IsNotNull(method);
Assert.AreSame(inner, outer.GetNestedType("IInner", BindingFlags.Public));
}
protected void CreateEmptyIInvocationInvokeOnTarget(NestedClassEmitter nested)
{
const MethodAttributes methodAtts = MethodAttributes.Public | MethodAttributes.Final | MethodAttributes.Virtual;
MethodEmitter method =
nested.CreateMethod("InvokeMethodOnTarget", methodAtts, typeof(void));
// TODO: throw exception
String message =
String.Format("This is a DynamicProxy2 error: the interceptor attempted " +
"to 'Proceed' for a method without a target, for example, an interface method or an abstract method");
method.CodeBuilder.AddStatement(new ThrowStatement(typeof(NotImplementedException), message));
method.CodeBuilder.AddStatement(new ReturnStatement());
}
/// <summary>
/// Generates the constructor for the nested class that extends
/// <see cref="AbstractInvocation"/>
/// </summary>
/// <param name="targetFieldType"></param>
/// <param name="nested"></param>
/// <param name="targetField"></param>
/// <param name="version"></param>
protected void CreateIInvocationConstructor(
Type targetFieldType, NestedClassEmitter nested, FieldReference targetField, ConstructorVersion version)
{
ArgumentReference cArg0 = new ArgumentReference(targetFieldType);
ArgumentReference cArg1 = new ArgumentReference(typeof(IInterceptor[]));
ArgumentReference cArg2 = new ArgumentReference(typeof(Type));
ArgumentReference cArg3 = new ArgumentReference(typeof(MethodInfo));
ArgumentReference cArg4 = null;
ArgumentReference cArg6 = new ArgumentReference(typeof(object));
if (version == ConstructorVersion.WithTargetMethod)
{
cArg4 = new ArgumentReference(typeof(MethodInfo));
}
ArgumentReference cArg5 = new ArgumentReference(typeof(object[]));
ConstructorEmitter constructor;
if (cArg4 == null)
{
constructor = nested.CreateConstructor(cArg0, cArg1, cArg2, cArg3, cArg5, cArg6);
}
else
{
constructor = nested.CreateConstructor(cArg0, cArg1, cArg2, cArg3, cArg4, cArg5, cArg6);
}
constructor.CodeBuilder.AddStatement(new AssignStatement(targetField, cArg0.ToExpression()));
if (cArg4 == null)
{
constructor.CodeBuilder.InvokeBaseConstructor(Constants.AbstractInvocationConstructorWithoutTargetMethod,
cArg0,
cArg6,
cArg1,
cArg2,
cArg3,
cArg5);
}
else
{
constructor.CodeBuilder.InvokeBaseConstructor(Constants.AbstractInvocationConstructorWithTargetMethod,
cArg0,
cArg6,
cArg1,
cArg2,
cArg3,
cArg4,
cArg5);
}
constructor.CodeBuilder.AddStatement(new ReturnStatement());
}
/// <summary>
/// If callbackMethod is null the InvokeOnTarget implementation
/// is just the code to throw an exception
/// </summary>
/// <param name="emitter"></param>
/// <param name="targetType"></param>
/// <param name="targetForInvocation"></param>
/// <param name="methodInfo"></param>
/// <param name="callbackMethod"></param>
/// <param name="version"></param>
/// <param name="allowChangeTarget">If true the invocation will implement the IChangeProxyTarget interface</param>
/// <returns></returns>
protected NestedClassEmitter BuildInvocationNestedType(
ClassEmitter emitter,
Type targetType,
Type targetForInvocation,
MethodInfo methodInfo,
MethodInfo callbackMethod,
ConstructorVersion version,
bool allowChangeTarget)
{
CheckNotGenericTypeDefinition(targetType, "targetType");
CheckNotGenericTypeDefinition(targetForInvocation, "targetForInvocation");
nestedCounter++;
Type[] interfaces = new Type[0];
if (allowChangeTarget)
{
interfaces = new Type[] {typeof(IChangeProxyTarget)};
}
NestedClassEmitter nested =
new NestedClassEmitter(emitter,
"Invocation" + methodInfo.Name + "_" + nestedCounter.ToString(),
typeof(AbstractInvocation),
interfaces);
// invocation only needs to mirror the generic parameters of the MethodInfo
// targetType cannot be a generic type definition
nested.CreateGenericParameters(methodInfo.GetGenericArguments());
// Create the invocation fields
FieldReference targetRef = nested.CreateField("target", targetForInvocation);
// Create constructor
CreateIInvocationConstructor(targetForInvocation, nested, targetRef, version);
if (allowChangeTarget)
{
ArgumentReference argument1 = new ArgumentReference(typeof(object));
MethodEmitter methodEmitter =
nested.CreateMethod("ChangeInvocationTarget", MethodAttributes.Public | MethodAttributes.Virtual,
typeof(void), argument1);
methodEmitter.CodeBuilder.AddStatement(
new AssignStatement(targetRef,
new ConvertExpression(targetType, argument1.ToExpression())
)
);
methodEmitter.CodeBuilder.AddStatement(new ReturnStatement());
}
// InvokeMethodOnTarget implementation
if (callbackMethod != null)
{
ParameterInfo[] parameters = methodInfo.GetParameters();
CreateIInvocationInvokeOnTarget(emitter, nested, parameters, targetRef, callbackMethod);
}
else
{
CreateEmptyIInvocationInvokeOnTarget(nested);
}
nested.DefineCustomAttribute(new SerializableAttribute());
return nested;
}
protected void CreateIInvocationInvokeOnTarget(
ClassEmitter targetTypeEmitter,
NestedClassEmitter nested,
ParameterInfo[] parameters,
FieldReference targetField,
MethodInfo callbackMethod)
{
const MethodAttributes methodAtts = MethodAttributes.Public | MethodAttributes.Final | MethodAttributes.Virtual;
MethodEmitter method =
nested.CreateMethod ("InvokeMethodOnTarget", methodAtts, typeof (void));
Expression[] args = new Expression[parameters.Length];
// Idea: instead of grab parameters one by one
// we should grab an array
Hashtable byRefArguments = new Hashtable();
for(int i = 0; i < parameters.Length; i++)
{
ParameterInfo param = parameters[i];
Type paramType = param.ParameterType;
if (HasGenericParameters(paramType))
{
paramType = paramType.GetGenericTypeDefinition().MakeGenericType(nested.GetGenericArgumentsFor(paramType));
}
else if (paramType.IsGenericParameter)
{
paramType = nested.GetGenericArgument(paramType.Name);
}
if (paramType.IsByRef)
{
LocalReference localReference = method.CodeBuilder.DeclareLocal(paramType.GetElementType());
method.CodeBuilder.AddStatement(
new AssignStatement(localReference,
new ConvertExpression(paramType.GetElementType(),
new MethodInvocationExpression(SelfReference.Self,
typeof(AbstractInvocation).GetMethod(
"GetArgumentValue"),
new LiteralIntExpression(i)))));
ByRefReference byRefReference = new ByRefReference(localReference);
args[i] = new ReferenceExpression(byRefReference);
byRefArguments[i] = localReference;
}
else
{
args[i] =
new ConvertExpression(paramType,
new MethodInvocationExpression(SelfReference.Self,
typeof(AbstractInvocation).GetMethod("GetArgumentValue"),
new LiteralIntExpression(i)));
}
}
MethodInvocationExpression baseMethodInvExp;
if (callbackMethod.IsGenericMethod)
{
callbackMethod = callbackMethod.MakeGenericMethod(nested.GetGenericArgumentsFor(callbackMethod));
}
baseMethodInvExp = new MethodInvocationExpression(targetField, callbackMethod, args);
baseMethodInvExp.VirtualCall = true;
LocalReference ret_local = null;
if (callbackMethod.ReturnType != typeof(void))
{
if (callbackMethod.ReturnType.IsGenericParameter)
{
ret_local = method.CodeBuilder.DeclareLocal(nested.GetGenericArgument(callbackMethod.ReturnType.Name));
}
else if (HasGenericParameters(callbackMethod.ReturnType))
{
ret_local =
method.CodeBuilder.DeclareLocal(
callbackMethod.ReturnType.GetGenericTypeDefinition().MakeGenericType(
nested.GetGenericArgumentsFor(callbackMethod.ReturnType)));
}
else
{
ret_local = method.CodeBuilder.DeclareLocal(callbackMethod.ReturnType);
}
method.CodeBuilder.AddStatement(new AssignStatement(ret_local, baseMethodInvExp));
}
else
{
method.CodeBuilder.AddStatement(new ExpressionStatement(baseMethodInvExp));
}
foreach(DictionaryEntry byRefArgument in byRefArguments)
{
int index = (int) byRefArgument.Key;
LocalReference localReference = (LocalReference) byRefArgument.Value;
method.CodeBuilder.AddStatement(
new ExpressionStatement(
new MethodInvocationExpression(SelfReference.Self,
typeof(AbstractInvocation).GetMethod("SetArgumentValue"),
new LiteralIntExpression(index),
new ConvertExpression(typeof(object), localReference.Type,
new ReferenceExpression(localReference)))
));
}
if (callbackMethod.ReturnType != typeof(void))
{
MethodInvocationExpression setRetVal =
new MethodInvocationExpression(SelfReference.Self,
typeof(AbstractInvocation).GetMethod("set_ReturnValue"),
new ConvertExpression(typeof(object), ret_local.Type, ret_local.ToExpression()));
method.CodeBuilder.AddStatement(new ExpressionStatement(setRetVal));
}
method.CodeBuilder.AddStatement(new ReturnStatement());
}
protected MethodEmitter ImplementProxiedMethod(
Type targetType,
MethodEmitter methodEmitter,
MethodInfo method,
ClassEmitter emitter,
NestedClassEmitter invocationImpl,
FieldReference interceptorsField,
Reference targetRef,
ConstructorVersion version,
MethodInfo methodOnTarget)
{
CheckNotGenericTypeDefinition(targetType, "targetType");
methodEmitter.CopyParametersAndReturnTypeFrom(method, emitter);
TypeReference[] dereferencedArguments = IndirectReference.WrapIfByRef(methodEmitter.Arguments);
Type iinvocation = invocationImpl.TypeBuilder;
Trace.Assert(method.IsGenericMethod == iinvocation.IsGenericTypeDefinition);
bool isGenericInvocationClass = false;
Type[] genericMethodArgs = new Type[0];
if (method.IsGenericMethod)
{
// bind generic method arguments to invocation's type arguments
genericMethodArgs = methodEmitter.MethodBuilder.GetGenericArguments();
iinvocation = iinvocation.MakeGenericType(genericMethodArgs);
isGenericInvocationClass = true;
}
LocalReference invocationImplLocal = methodEmitter.CodeBuilder.DeclareLocal(iinvocation);
// TODO: Initialize iinvocation instance
// with ordinary arguments and in and out arguments
Expression interceptors;
// if (useSelector)
{
// TODO: Generate code that checks the return of selector
// if no interceptors is returned, should we invoke the base.Method directly?
}
// else
{
interceptors = interceptorsField.ToExpression();
}
Expression typeTokenFieldExp = typeTokenField.ToExpression();
Expression methodInfoTokenExp;
if (method2TokenField.ContainsKey(method)) // Token is in the cache
{
methodInfoTokenExp = ((FieldReference) method2TokenField[method]).ToExpression();
}
else
{
// Not in the cache: generic method
methodInfoTokenExp = new MethodTokenExpression(method.MakeGenericMethod(genericMethodArgs));
}
ConstructorInfo constructor = invocationImpl.Constructors[0].ConstructorBuilder;
if (isGenericInvocationClass)
{
constructor = TypeBuilder.GetConstructor(iinvocation, invocationImpl.Constructors[0].ConstructorBuilder);
}
NewInstanceExpression newInvocImpl;
if (version == ConstructorVersion.WithTargetMethod)
{
Expression methodOnTargetTokenExp;
if (method2TokenField.ContainsKey(methodOnTarget)) // Token is in the cache
{
methodOnTargetTokenExp = ((FieldReference) method2TokenField[methodOnTarget]).ToExpression();
}
else
{
// Not in the cache: generic method
methodOnTargetTokenExp = new MethodTokenExpression(methodOnTarget.MakeGenericMethod(genericMethodArgs));
}
newInvocImpl =
new NewInstanceExpression(constructor,
targetRef.ToExpression(),
interceptors,
typeTokenFieldExp,
methodOnTargetTokenExp,
methodInfoTokenExp,
new ReferencesToObjectArrayExpression(dereferencedArguments),
SelfReference.Self.ToExpression());
}
else
{
newInvocImpl =
new NewInstanceExpression(constructor,
targetRef.ToExpression(),
interceptors,
typeTokenFieldExp,
methodInfoTokenExp,
new ReferencesToObjectArrayExpression(dereferencedArguments),
SelfReference.Self.ToExpression());
}
methodEmitter.CodeBuilder.AddStatement(new AssignStatement(invocationImplLocal, newInvocImpl));
if (method.ContainsGenericParameters)
{
EmitLoadGenricMethodArguments(methodEmitter, method.MakeGenericMethod(genericMethodArgs), invocationImplLocal);
}
methodEmitter.CodeBuilder.AddStatement(
new ExpressionStatement(new MethodInvocationExpression(invocationImplLocal, Constants.AbstractInvocationProceed)));
CopyOutAndRefParameters(dereferencedArguments, invocationImplLocal, method, methodEmitter);
if (method.ReturnType != typeof(void))
{
// Emit code to return with cast from ReturnValue
MethodInvocationExpression getRetVal =
new MethodInvocationExpression(invocationImplLocal, typeof(AbstractInvocation).GetMethod("get_ReturnValue"));
methodEmitter.CodeBuilder.AddStatement(
new ReturnStatement(new ConvertExpression(methodEmitter.ReturnType, getRetVal)));
}
else
{
methodEmitter.CodeBuilder.AddStatement(new ReturnStatement());
}
return methodEmitter;
}
protected MethodEmitter CreateProxiedMethod(
Type targetType,
MethodInfo method,
ClassEmitter emitter,
NestedClassEmitter invocationImpl,
FieldReference interceptorsField,
Reference targetRef,
ConstructorVersion version,
MethodInfo methodOnTarget)
{
CheckNotGenericTypeDefinition(targetType, "targetType");
MethodAttributes atts = ObtainMethodAttributes(method);
MethodEmitter methodEmitter = emitter.CreateMethod(method.Name, atts);
return
ImplementProxiedMethod(targetType,
methodEmitter,
method,
emitter,
invocationImpl,
interceptorsField,
targetRef,
version,
methodOnTarget);
}
public void AddNestedClass(NestedClassEmitter nestedClass)
{
nested.Add(nestedClass);
}
public void Add(NestedClassEmitter nested)
{
InnerList.Add(nested);
}
protected MethodEmitter ImplementProxiedMethod(
Type targetType,
MethodEmitter methodEmitter,
MethodInfo method,
ClassEmitter emitter,
NestedClassEmitter invocationImpl,
FieldReference interceptorsField,
Reference targetRef,
ConstructorVersion version,
MethodInfo methodOnTarget)
{
CheckNotGenericTypeDefinition(targetType, "targetType");
methodEmitter.CopyParametersAndReturnTypeFrom(method, emitter);
TypeReference[] dereferencedArguments = IndirectReference.WrapIfByRef(methodEmitter.Arguments);
Type iinvocation = invocationImpl.TypeBuilder;
Trace.Assert(method.IsGenericMethod == iinvocation.IsGenericTypeDefinition);
bool isGenericInvocationClass = false;
Type[] genericMethodArgs = new Type[0];
if (method.IsGenericMethod)
{
// bind generic method arguments to invocation's type arguments
genericMethodArgs = methodEmitter.MethodBuilder.GetGenericArguments();
iinvocation = iinvocation.MakeGenericType(genericMethodArgs);
isGenericInvocationClass = true;
}
Expression typeTokenFieldExp = typeTokenField.ToExpression();
Expression methodInfoTokenExp;
string tokenFieldName;
if (method2TokenField.ContainsKey(method)) // Token is in the cache
{
FieldReference methodTokenField = method2TokenField[method];
tokenFieldName = methodTokenField.Reference.Name;
methodInfoTokenExp = methodTokenField.ToExpression();
}
else
{
// Not in the cache: generic method
MethodInfo genericMethod = method.MakeGenericMethod(genericMethodArgs);
// Need random suffix added to the name, so that we don't end up with duplicate field names for
// methods with the same name, but different generic parameters
tokenFieldName = string.Format("{0}_{1}_{2}", genericMethod.Name, genericMethodArgs.Length,
Guid.NewGuid().ToString("N"));
methodInfoTokenExp = new MethodTokenExpression(genericMethod);
}
LocalReference invocationImplLocal = methodEmitter.CodeBuilder.DeclareLocal(iinvocation);
// TODO: Initialize iinvocation instance with ordinary arguments and in and out arguments
Expression interceptors = interceptorsField.ToExpression();
// Create the field to store the selected interceptors for this method if an InterceptorSelector is specified
FieldReference methodInterceptors = null;
if (proxyGenerationOptions.Selector != null)
{
// If no interceptors are returned, should we invoke the base.Method directly? Looks like we should not.
methodInterceptors = emitter.CreateField(string.Format("{0}_interceptors", tokenFieldName), typeof(IInterceptor[]));
}
ConstructorInfo constructor = invocationImpl.Constructors[0].ConstructorBuilder;
if (isGenericInvocationClass)
{
constructor = TypeBuilder.GetConstructor(iinvocation, constructor);
}
NewInstanceExpression newInvocImpl;
if (version == ConstructorVersion.WithTargetMethod)
{
Expression methodOnTargetTokenExp;
if (method2TokenField.ContainsKey(methodOnTarget)) // Token is in the cache
{
methodOnTargetTokenExp = method2TokenField[methodOnTarget].ToExpression();
}
else
{
// Not in the cache: generic method
methodOnTargetTokenExp = new MethodTokenExpression(methodOnTarget.MakeGenericMethod(genericMethodArgs));
}
if (methodInterceptors == null)
{
newInvocImpl = //actual contructor call
new NewInstanceExpression(constructor,
targetRef.ToExpression(),
interceptors,
typeTokenFieldExp,
methodOnTargetTokenExp,
methodInfoTokenExp,
new ReferencesToObjectArrayExpression(dereferencedArguments),
SelfReference.Self.ToExpression());
}
else
{
MethodInvocationExpression methodInvocationExpression =
new MethodInvocationExpression(proxyGenerationOptionsField, proxyGenerationOptions_Selector);
methodInvocationExpression.VirtualCall = true;
newInvocImpl = //actual contructor call
new NewInstanceExpression(constructor,
targetRef.ToExpression(),
interceptors,
typeTokenFieldExp,
methodOnTargetTokenExp,
methodInfoTokenExp,
new ReferencesToObjectArrayExpression(dereferencedArguments),
SelfReference.Self.ToExpression(),
methodInvocationExpression,
new AddressOfReferenceExpression(methodInterceptors));
}
}
else
{
if (methodInterceptors == null)
{
newInvocImpl =
new NewInstanceExpression(constructor,
targetRef.ToExpression(),
interceptors,
typeTokenFieldExp,
methodInfoTokenExp,
new ReferencesToObjectArrayExpression(dereferencedArguments),
SelfReference.Self.ToExpression());
}
else
{
MethodInvocationExpression methodInvocationExpression =
new MethodInvocationExpression(proxyGenerationOptionsField, proxyGenerationOptions_Selector);
methodInvocationExpression.VirtualCall = true;
newInvocImpl =
new NewInstanceExpression(constructor,
targetRef.ToExpression(),
interceptors,
typeTokenFieldExp,
methodInfoTokenExp,
new ReferencesToObjectArrayExpression(dereferencedArguments),
SelfReference.Self.ToExpression(),
methodInvocationExpression,
new AddressOfReferenceExpression(methodInterceptors));
}
}
methodEmitter.CodeBuilder.AddStatement(new AssignStatement(invocationImplLocal, newInvocImpl));
if (method.ContainsGenericParameters)
{
EmitLoadGenricMethodArguments(methodEmitter, method.MakeGenericMethod(genericMethodArgs), invocationImplLocal);
}
methodEmitter.CodeBuilder.AddStatement(
new ExpressionStatement(new MethodInvocationExpression(invocationImplLocal, Constants.AbstractInvocationProceed)));
CopyOutAndRefParameters(dereferencedArguments, invocationImplLocal, method, methodEmitter);
if (method.ReturnType != typeof(void))
{
// Emit code to return with cast from ReturnValue
MethodInvocationExpression getRetVal =
new MethodInvocationExpression(invocationImplLocal, typeof(AbstractInvocation).GetMethod("get_ReturnValue"));
methodEmitter.CodeBuilder.AddStatement(
new ReturnStatement(new ConvertExpression(methodEmitter.ReturnType, getRetVal)));
}
else
{
methodEmitter.CodeBuilder.AddStatement(new ReturnStatement());
}
return methodEmitter;
}