public MethodInvocationExpression GetCallbackMethodInvocation(AbstractTypeEmitter invocation, Expression[] args,
Reference targetField,
MethodEmitter invokeMethodOnTarget)
{
var @delegate = GetDelegate(invocation, invokeMethodOnTarget);
return new MethodInvocationExpression(@delegate, GetCallbackMethod(), args);
}
protected override void ImplementInvokeMethodOnTarget(AbstractTypeEmitter invocation, ParameterInfo[] parameters,
MethodEmitter invokeMethodOnTarget, Reference targetField)
{
invokeMethodOnTarget.CodeBuilder.AddStatement(
new ExpressionStatement(
new MethodInvocationExpression(SelfReference.Self, InvocationMethods.EnsureValidTarget)));
base.ImplementInvokeMethodOnTarget(invocation, parameters, invokeMethodOnTarget, targetField);
}
public MethodInvocationExpression GetCallbackMethodInvocation(AbstractTypeEmitter invocation, Expression[] args,
Reference targetField,
MethodEmitter invokeMethodOnTarget)
{
var allArgs = GetAllArgs(args, targetField);
var @delegate = (Reference)invocation.GetField("delegate");
return new MethodInvocationExpression(@delegate, GetCallbackMethod(), allArgs);
}
private Reference GetDelegate(AbstractTypeEmitter invocation, MethodEmitter invokeMethodOnTarget)
{
var closedDelegateType = delegateType.MakeGenericType(invocation.GenericTypeParams);
var localReference = invokeMethodOnTarget.CodeBuilder.DeclareLocal(closedDelegateType);
var closedMethodOnTarget = method.MethodOnTarget.MakeGenericMethod(invocation.GenericTypeParams);
var localTarget = new ReferenceExpression(targetReference);
invokeMethodOnTarget.CodeBuilder.AddStatement(
SetDelegate(localReference, localTarget, closedDelegateType, closedMethodOnTarget));
return localReference;
}
public MethodEmitter CreateAddMethod(string addMethodName, MethodAttributes attributes, MethodInfo methodToOverride)
{
if (addMethod != null)
{
throw new InvalidOperationException("An add method exists");
}
addMethod = new MethodEmitter(typeEmitter, addMethodName, attributes, methodToOverride);
return addMethod;
}
protected override MethodEmitter BuildProxiedMethodBody(MethodEmitter emitter, ClassEmitter @class,
ProxyGenerationOptions options, INamingScope namingScope)
{
var targetReference = getTargetReference(@class, MethodToOverride);
emitter.CodeBuilder.AddStatement(
new ExpressionStatement(
new IfNullExpression(targetReference, IfNull(emitter.ReturnType), IfNotNull(targetReference))));
return emitter;
}
public MethodEmitter CreateRemoveMethod(string removeMethodName, MethodAttributes attributes,
MethodInfo methodToOverride)
{
if (removeMethod != null)
{
throw new InvalidOperationException("A remove method exists");
}
removeMethod = new MethodEmitter(typeEmitter, removeMethodName, attributes, methodToOverride);
return removeMethod;
}
public MethodEmitter CreateGetMethod(string name, MethodAttributes attrs, MethodInfo methodToOverride,
params Type[] parameters)
{
if (getMethod != null)
{
throw new InvalidOperationException("A get method exists");
}
getMethod = new MethodEmitter(parentTypeEmitter, name, attrs, methodToOverride);
return getMethod;
}
public MethodEmitter CreateSetMethod(string name, MethodAttributes attrs, MethodInfo methodToOverride,
params Type[] parameters)
{
if (setMethod != null)
{
throw new InvalidOperationException("A set method exists");
}
setMethod = new MethodEmitter(parentTypeEmitter, name, attrs, methodToOverride);
return(setMethod);
}
private void InitOutParameters(MethodEmitter emitter, ParameterInfo[] parameters)
{
for (var index = 0; index < parameters.Length; index++)
{
var parameter = parameters[index];
if (parameter.IsOut)
{
emitter.CodeBuilder.AddStatement(
new AssignArgumentStatement(new ArgumentReference(parameter.ParameterType, index + 1, parameter.Attributes),
new DefaultValueExpression(parameter.ParameterType)));
}
}
}
protected override MethodEmitter BuildProxiedMethodBody(MethodEmitter emitter, ClassEmitter @class,
ProxyGenerationOptions options, INamingScope namingScope)
{
var targetReference = getTargetReference(@class, MethodToOverride);
var arguments = ArgumentsUtil.ConvertToArgumentReferenceExpression(MethodToOverride.GetParameters());
emitter.CodeBuilder.AddStatement(new ReturnStatement(
new MethodInvocationExpression(
targetReference,
MethodToOverride,
arguments) { VirtualCall = true }));
return emitter;
}
protected override MethodEmitter BuildProxiedMethodBody(MethodEmitter emitter, ClassEmitter @class,
ProxyGenerationOptions options, INamingScope namingScope)
{
InitOutParameters(emitter, MethodToOverride.GetParameters());
if (emitter.ReturnType == typeof(void))
{
emitter.CodeBuilder.AddStatement(new ReturnStatement());
}
else
{
emitter.CodeBuilder.AddStatement(new ReturnStatement(new DefaultValueExpression(emitter.ReturnType)));
}
return emitter;
}
public static void CopyOutAndRefParameters(TypeReference[] dereferencedArguments, LocalReference invocation,
MethodInfo method, MethodEmitter emitter)
{
var parameters = method.GetParameters();
if (!ArgumentsUtil.IsAnyByRef(parameters))
{
return; //saving the need to create locals if there is no need
}
var arguments = StoreInvocationArgumentsInLocal(emitter, invocation);
for (var i = 0; i < parameters.Length; i++)
{
if (!parameters[i].ParameterType.IsByRef)
{
continue;
}
emitter.CodeBuilder.AddStatement(AssignArgument(dereferencedArguments, i, arguments));
}
}
protected override MethodEmitter BuildProxiedMethodBody(MethodEmitter emitter, ClassEmitter @class, ProxyGenerationOptions options, INamingScope namingScope)
{
var invocationType = invocation;
Trace.Assert(MethodToOverride.IsGenericMethod == invocationType.IsGenericTypeDefinition);
var genericArguments = Type.EmptyTypes;
var constructor = invocation.GetConstructors()[0];
Expression proxiedMethodTokenExpression;
if (MethodToOverride.IsGenericMethod)
{
// bind generic method arguments to invocation's type arguments
genericArguments = emitter.MethodBuilder.GetGenericArguments();
invocationType = invocationType.MakeGenericType(genericArguments);
constructor = TypeBuilder.GetConstructor(invocationType, constructor);
// Not in the cache: generic method
proxiedMethodTokenExpression = new MethodTokenExpression(MethodToOverride.MakeGenericMethod(genericArguments));
}
else
{
var proxiedMethodToken = @class.CreateStaticField(namingScope.GetUniqueName("token_" + MethodToOverride.Name), typeof(MethodInfo));
@class.ClassConstructor.CodeBuilder.AddStatement(new AssignStatement(proxiedMethodToken, new MethodTokenExpression(MethodToOverride)));
proxiedMethodTokenExpression = proxiedMethodToken.ToExpression();
}
var methodInterceptors = SetMethodInterceptors(@class, namingScope, emitter, proxiedMethodTokenExpression);
var dereferencedArguments = IndirectReference.WrapIfByRef(emitter.Arguments);
var hasByRefArguments = HasByRefArguments(emitter.Arguments);
var arguments = GetCtorArguments(@class, proxiedMethodTokenExpression, dereferencedArguments, methodInterceptors);
var ctorArguments = ModifyArguments(@class, arguments);
var invocationLocal = emitter.CodeBuilder.DeclareLocal(invocationType);
emitter.CodeBuilder.AddStatement(new AssignStatement(invocationLocal,
new NewInstanceExpression(constructor, ctorArguments)));
if (MethodToOverride.ContainsGenericParameters)
{
EmitLoadGenricMethodArguments(emitter, MethodToOverride.MakeGenericMethod(genericArguments), invocationLocal);
}
if (hasByRefArguments)
{
emitter.CodeBuilder.AddStatement(new TryStatement());
}
var proceed = new ExpressionStatement(new MethodInvocationExpression(invocationLocal, InvocationMethods.Proceed));
emitter.CodeBuilder.AddStatement(proceed);
if (hasByRefArguments)
{
emitter.CodeBuilder.AddStatement(new FinallyStatement());
}
GeneratorUtil.CopyOutAndRefParameters(dereferencedArguments, invocationLocal, MethodToOverride, emitter);
if (hasByRefArguments)
{
emitter.CodeBuilder.AddStatement(new EndExceptionBlockStatement());
}
if (MethodToOverride.ReturnType != typeof(void))
{
// Emit code to return with cast from ReturnValue
var getRetVal = new MethodInvocationExpression(invocationLocal, InvocationMethods.GetReturnValue);
emitter.CodeBuilder.AddStatement(new ReturnStatement(new ConvertExpression(emitter.ReturnType, getRetVal)));
}
else
{
emitter.CodeBuilder.AddStatement(new ReturnStatement());
}
return emitter;
}
private void EmitLoadGenricMethodArguments(MethodEmitter methodEmitter, MethodInfo method, Reference invocationLocal)
{
var genericParameters = method.GetGenericArguments().FindAll(t => t.IsGenericParameter);
var genericParamsArrayLocal = methodEmitter.CodeBuilder.DeclareLocal(typeof(Type[]));
methodEmitter.CodeBuilder.AddStatement(
new AssignStatement(genericParamsArrayLocal, new NewArrayExpression(genericParameters.Length, typeof(Type))));
for (var i = 0; i < genericParameters.Length; ++i)
{
methodEmitter.CodeBuilder.AddStatement(
new AssignArrayStatement(genericParamsArrayLocal, i, new TypeTokenExpression(genericParameters[i])));
}
methodEmitter.CodeBuilder.AddExpression(
new MethodInvocationExpression(invocationLocal,
InvocationMethods.SetGenericMethodArguments,
new ReferenceExpression(
genericParamsArrayLocal)));
}
private Expression SetMethodInterceptors(ClassEmitter @class, INamingScope namingScope, MethodEmitter emitter, Expression proxiedMethodTokenExpression)
{
var selector = @class.GetField("__selector");
if(selector == null)
{
return null;
}
var methodInterceptorsField = BuildMethodInterceptorsField(@class, MethodToOverride, namingScope);
var emptyInterceptors = new NewArrayExpression(0, typeof(IInterceptor));
var selectInterceptors = new MethodInvocationExpression(selector, InterceptorSelectorMethods.SelectInterceptors,
new MethodInvocationExpression(null,
TypeUtilMethods.GetTypeOrNull,
getTargetExpression(@class, MethodToOverride)),
proxiedMethodTokenExpression, interceptors.ToExpression())
{ VirtualCall = true };
emitter.CodeBuilder.AddExpression(
new IfNullExpression(methodInterceptorsField,
new AssignStatement(methodInterceptorsField,
new NullCoalescingOperatorExpression(selectInterceptors, emptyInterceptors))));
return methodInterceptorsField.ToExpression();
}
private static LocalReference StoreInvocationArgumentsInLocal(MethodEmitter emitter, LocalReference invocation)
{
var invocationArgs = emitter.CodeBuilder.DeclareLocal(typeof(object[]));
emitter.CodeBuilder.AddStatement(GetArguments(invocationArgs, invocation));
return invocationArgs;
}