private static void BuildMethodsInType(TypeDebugging type)
{
using (var ctor = type.GetMethodDebugging(
type.Builder.DefineConstructor(
MethodAttributes.Public | MethodAttributes.SpecialName |
MethodAttributes.RTSpecialName | MethodAttributes.HideBySig,
CallingConventions.Standard, Type.EmptyTypes)))
{
ctor.Emit(OpCodes.Ldarg_0);
var objectCtor = typeof(object).GetConstructor(Type.EmptyTypes);
ctor.Emit(OpCodes.Call, objectCtor);
ctor.Emit(OpCodes.Ret);
}
using (var method = type.GetMethodDebugging(
type.Builder.DefineMethod("ReflectArgument",
MethodAttributes.HideBySig | MethodAttributes.Static | MethodAttributes.Public,
typeof(int), new Type[] { typeof(int) })))
{
method.Emit(OpCodes.Ldarg_0);
method.Emit(OpCodes.Ret);
}
type.Builder.CreateType();
}
private static void BuildConstructor(TypeBuilder proxyBuilder, Type proxyType,
FieldBuilder wrappedType, FieldBuilder invokeHandlers, TypeDebugging debug)
{
var arguments = new Type[] { proxyType, typeof(IInvocationHandler[]) };
var constructor = proxyBuilder.DefineConstructor(
MethodAttributes.Public | MethodAttributes.SpecialName |
MethodAttributes.RTSpecialName | MethodAttributes.HideBySig,
CallingConventions.Standard, arguments);
using (var generator = debug.GetMethodDebugging(constructor))
{
// Call the base constructor.
generator.Emit(OpCodes.Ldarg_0);
var objectCtor = proxyType.GetConstructor(Type.EmptyTypes);
generator.Emit(OpCodes.Call, objectCtor);
// Store the target object.
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldarg_1);
generator.Emit(OpCodes.Stfld, wrappedType);
// Store the handlers.
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldarg_2);
generator.Emit(OpCodes.Stfld, invokeHandlers);
generator.Emit(OpCodes.Ret);
}
}
private static void BuildConstructor(TypeBuilder proxyBuilder, Type proxyType,
FieldBuilder wrappedType, FieldBuilder invokeHandlers, TypeDebugging debug)
{
var arguments = new Type[] { proxyType, typeof(IInvocationHandler[]) };
var constructor = proxyBuilder.DefineConstructor(
MethodAttributes.Public | MethodAttributes.SpecialName |
MethodAttributes.RTSpecialName | MethodAttributes.HideBySig,
CallingConventions.Standard, arguments);
using (var generator = debug.GetMethodDebugging(constructor))
{
// Call the base constructor.
generator.Emit(OpCodes.Ldarg_0);
var objectCtor = proxyType.GetConstructor(Type.EmptyTypes);
generator.Emit(OpCodes.Call, objectCtor);
// Store the target object.
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldarg_1);
generator.Emit(OpCodes.Stfld, wrappedType);
// Store the handlers.
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldarg_2);
generator.Emit(OpCodes.Stfld, invokeHandlers);
generator.Emit(OpCodes.Ret);
}
}
public static void CallGetMethodDebuggingWithMethodBuilderAfterDisposing()
{
TypeDebugging type = null;
using (var assembly = AssemblyCreationTests.CreateDebuggingAssembly("Me"))
{
using (type = AssemblyCreationTests.CreateDebuggingType(assembly,
assembly.Builder.GetDynamicModule("Me"), "Type")) { }
Assert.Throws <ObjectDisposedException>(() => type.GetMethodDebugging(null as MethodBuilder));
}
}
private static void BuildParameterlessConstructor(TypeBuilder proxyBuilder, Type proxyType,
TypeDebugging debug)
{
var constructor = proxyBuilder.DefineConstructor(
MethodAttributes.Private | MethodAttributes.SpecialName |
MethodAttributes.RTSpecialName | MethodAttributes.HideBySig,
CallingConventions.Standard, Type.EmptyTypes);
using (var generator = debug.GetMethodDebugging(constructor))
{
generator.Emit(OpCodes.Ldarg_0);
var objectCtor = proxyType.GetConstructor(Type.EmptyTypes);
generator.Emit(OpCodes.Call, objectCtor);
generator.Emit(OpCodes.Ret);
}
}
private static void BuildParameterlessConstructor(TypeBuilder proxyBuilder, Type proxyType,
TypeDebugging debug)
{
var constructor = proxyBuilder.DefineConstructor(
MethodAttributes.Private | MethodAttributes.SpecialName |
MethodAttributes.RTSpecialName | MethodAttributes.HideBySig,
CallingConventions.Standard, Type.EmptyTypes);
using (var generator = debug.GetMethodDebugging(constructor))
{
generator.Emit(OpCodes.Ldarg_0);
var objectCtor = proxyType.GetConstructor(Type.EmptyTypes);
generator.Emit(OpCodes.Call, objectCtor);
generator.Emit(OpCodes.Ret);
}
}
private static void BuildIProxyTargetPropertyMethod(
TypeBuilder proxyBuilder, Type targetType, Type iProxyType,
FieldBuilder wrappedObject, TypeDebugging debug)
{
var attributes = MethodAttributes.HideBySig |
MethodAttributes.Virtual | MethodAttributes.Private;
var method = proxyBuilder.DefineMethod(GetTargetMethod,
attributes, targetType, Type.EmptyTypes);
proxyBuilder.DefineMethodOverride(method,
iProxyType.GetProperty(TargetProperty).GetGetMethod());
using (var generator = debug.GetMethodDebugging(method))
{
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, wrappedObject);
generator.Emit(OpCodes.Ret);
}
}
private static void BuildIProxyTargetPropertyMethod(
TypeBuilder proxyBuilder, Type targetType, Type iProxyType,
FieldBuilder wrappedObject, TypeDebugging debug)
{
var attributes = MethodAttributes.HideBySig |
MethodAttributes.Virtual | MethodAttributes.Private;
var method = proxyBuilder.DefineMethod(GetTargetMethod,
attributes, targetType, Type.EmptyTypes);
proxyBuilder.DefineMethodOverride(method,
iProxyType.GetProperty(TargetProperty).GetGetMethod());
using (var generator = debug.GetMethodDebugging(method))
{
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, wrappedObject);
generator.Emit(OpCodes.Ret);
}
}
private static void BuildMethodsInType(TypeDebugging type)
{
using (var ctor = type.GetMethodDebugging(
type.Builder.DefineConstructor(
MethodAttributes.Public | MethodAttributes.SpecialName |
MethodAttributes.RTSpecialName | MethodAttributes.HideBySig,
CallingConventions.Standard, Type.EmptyTypes)))
{
ctor.Emit(OpCodes.Ldarg_0);
var objectCtor = typeof(object).GetConstructor(Type.EmptyTypes);
ctor.Emit(OpCodes.Call, objectCtor);
ctor.Emit(OpCodes.Ret);
}
using (var method = type.GetMethodDebugging(
type.Builder.DefineMethod("ReflectArgument",
MethodAttributes.HideBySig | MethodAttributes.Static | MethodAttributes.Public,
typeof(int), new Type[] { typeof(int) })))
{
method.Emit(OpCodes.Ldarg_0);
method.Emit(OpCodes.Ret);
}
type.Builder.CreateType();
}
private static MethodBuilder BuildOnAfterMethodInvocation(TypeBuilder proxyBuilder,
FieldBuilder invokeHandlers, TypeDebugging debug)
{
var arguments = new Type[] { typeof(MethodBase), typeof(object[]),
Type.GetType("System.Object&"), typeof(Exception) };
var method = proxyBuilder.DefineMethod(OnAfterMethodInvocationMethod,
MethodAttributes.Private | MethodAttributes.HideBySig,
CallingConventions.HasThis,
typeof(void), arguments);
method.DefineParameter(1, ParameterAttributes.In, "currentMethod");
method.DefineParameter(2, ParameterAttributes.In, "arguments");
method.DefineParameter(3, ParameterAttributes.In | ParameterAttributes.Out, "returnValue");
method.DefineParameter(4, ParameterAttributes.In, "generatedException");
using (var generator = debug.GetMethodDebugging(method))
{
var i = generator.DeclareLocal(typeof(Int32));
var throwException = generator.DeclareLocal(typeof(bool));
var doNextHandlerAfterEx = generator.DefineLabel();
var incrementIAfterEx = generator.DefineLabel();
// Reset i = 0;
generator.Emit(OpCodes.Ldc_I4_0);
generator.Emit(OpCodes.Stloc, i);
generator.MarkLabel(doNextHandlerAfterEx);
// Load the next handler.
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, invokeHandlers);
generator.Emit(OpCodes.Ldloc, i);
generator.Emit(OpCodes.Ldelem_Ref);
// Load the handler's arguments.
generator.Emit(OpCodes.Ldarg_1);
generator.Emit(OpCodes.Ldarg_2);
generator.Emit(OpCodes.Ldarg_3);
generator.Emit(OpCodes.Ldarg, 4);
// AfterInvocationHandler
generator.Emit(OpCodes.Callvirt,
typeof(IInvocationHandler).GetMethod(AfterInvocation));
// If the return value == true, rethrow generatedException.
generator.Emit(OpCodes.Stloc, throwException);
generator.Emit(OpCodes.Ldloc, throwException);
generator.Emit(OpCodes.Brfalse, incrementIAfterEx);
generator.Emit(OpCodes.Ldarg, 4);
generator.Emit(OpCodes.Throw);
// Increment i.
generator.MarkLabel(incrementIAfterEx);
generator.Emit(OpCodes.Ldloc, i);
generator.Emit(OpCodes.Ldc_I4_1);
generator.Emit(OpCodes.Add);
generator.Emit(OpCodes.Stloc, i);
// See if i < invokeHandlers.Length.
generator.Emit(OpCodes.Ldloc, i);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, invokeHandlers);
generator.Emit(OpCodes.Ldlen);
generator.Emit(OpCodes.Conv_I4);
generator.Emit(OpCodes.Blt, doNextHandlerAfterEx);
// Exit loop and return
generator.Emit(OpCodes.Ret);
}
return method;
}
private static void BuildTargetMethods(TypeBuilder proxyBuilder, MethodBuilder onBeforeMethodInvocation,
MethodBuilder onAfterMethodInvocation, Type targetType,
FieldBuilder wrappedObject, Dictionary<MethodInfo, MethodMappings> targets, TypeDebugging debug)
{
var methodAttribs = MethodAttributes.HideBySig |
MethodAttributes.Virtual | MethodAttributes.Private;
foreach (var target in targets)
{
var targetMethod = target.Key;
var arguments = new Type[targetMethod.GetParameters().Length];
for (int i = 0; i < targetMethod.GetParameters().Length; i++)
{
arguments[i] = targetMethod.GetParameters()[i].ParameterType;
}
var method = proxyBuilder.DefineMethod(
targetMethod.Name + Proxy.ProxyExtension, methodAttribs, targetMethod.ReturnType, arguments);
ProxyMethodBuilder.HandleGenericMethodArguments(targetMethod, method);
// Determine if this method should override
// the mapped method (OverridesInterfaceMethods == false)
// or a number of itf. methods (OverridesInterfaceMethods == true)
var mappings = target.Value;
if (!mappings.OverridesInterfaceMethods)
{
proxyBuilder.DefineMethodOverride(method, targetMethod);
}
else
{
for (int itfs = 0; itfs < mappings.MappedMethods.Count; itfs++)
{
proxyBuilder.DefineMethodOverride(method, mappings.MappedMethods[itfs]);
}
}
using (var generator = debug.GetMethodDebugging(method))
{
var argumentValues = generator.DeclareLocal(typeof(object[]));
var callMethod = generator.DeclareLocal(typeof(bool));
generator.DeclareLocal(typeof(Type));
var generatedException = generator.DeclareLocal(typeof(Exception));
LocalBuilder returnValue = null;
var wrappedReturnValue = generator.DeclareLocal(typeof(object));
var baseMethod = generator.DeclareLocal(typeof(MethodBase));
var endCall = generator.DefineLabel();
// Check for a return value.
if (targetMethod.ReturnType != typeof(void))
{
returnValue = generator.DeclareLocal(targetMethod.ReturnType);
}
generator.Emit(OpCodes.Ldnull);
generator.Emit(OpCodes.Stloc, generatedException);
generator.Emit(OpCodes.Ldc_I4, targetMethod.GetParameters().Length);
generator.Emit(OpCodes.Newarr, typeof(object));
generator.Emit(OpCodes.Stloc, argumentValues);
// Get the target method.
generator.Emit(OpCodes.Ldtoken, targetMethod);
if (targetType.IsGenericType)
{
generator.Emit(OpCodes.Ldtoken, targetType);
generator.Emit(OpCodes.Call,
typeof(MethodBase).GetMethod(GetMethodFromHandleMethod,
new Type[] { typeof(RuntimeMethodHandle), typeof(RuntimeTypeHandle) }));
}
else
{
generator.Emit(OpCodes.Call,
typeof(MethodBase).GetMethod(GetMethodFromHandleMethod,
new Type[] { typeof(RuntimeMethodHandle) }));
}
generator.Emit(OpCodes.Stloc, baseMethod);
// call OnBeforeMethodInvocation.
ProxyMethodBuilder.WindArguments(targetMethod, generator, argumentValues, true);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldloc, baseMethod);
generator.Emit(OpCodes.Ldloc, argumentValues);
generator.Emit(OpCodes.Call, onBeforeMethodInvocation);
generator.Emit(OpCodes.Stloc, callMethod);
ProxyMethodBuilder.UnwindArguments(targetMethod, generator, argumentValues, true);
// If the call should be cancelled, break to the end.
generator.Emit(OpCodes.Ldloc, callMethod);
generator.Emit(OpCodes.Brfalse, endCall);
// Call the real method.
generator.BeginExceptionBlock();
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, wrappedObject);
for (var argLoad = 0; argLoad < targetMethod.GetParameters().Length; argLoad++)
{
generator.Emit(OpCodes.Ldarg, argLoad + 1);
}
generator.Emit(OpCodes.Callvirt, targetMethod);
if (targetMethod.ReturnType != typeof(void))
{
generator.Emit(OpCodes.Stloc, returnValue);
}
// call OnAfterInvocation
ProxyMethodBuilder.WindArguments(targetMethod, generator, argumentValues, false);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldloc, baseMethod);
generator.Emit(OpCodes.Ldloc, argumentValues);
ProxyMethodBuilder.WrapReturnValue(targetMethod, generator, returnValue, wrappedReturnValue);
generator.Emit(OpCodes.Ldloc, generatedException);
generator.Emit(OpCodes.Call, onAfterMethodInvocation);
ProxyMethodBuilder.UnwrapReturnValue(targetMethod, generator, returnValue, wrappedReturnValue);
ProxyMethodBuilder.UnwindArguments(targetMethod, generator, argumentValues, false);
generator.BeginCatchBlock(typeof(Exception));
// call OnAfterInvocationWithException
generator.Emit(OpCodes.Stloc, generatedException);
ProxyMethodBuilder.WindArguments(targetMethod, generator, argumentValues, false);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldloc, baseMethod);
generator.Emit(OpCodes.Ldloc, argumentValues);
ProxyMethodBuilder.WrapReturnValue(targetMethod, generator, returnValue, wrappedReturnValue);
generator.Emit(OpCodes.Ldloc, generatedException);
generator.Emit(OpCodes.Call, onAfterMethodInvocation);
ProxyMethodBuilder.UnwrapReturnValue(targetMethod, generator, returnValue, wrappedReturnValue);
ProxyMethodBuilder.UnwindArguments(targetMethod, generator, argumentValues, false);
generator.EndExceptionBlock();
generator.MarkLabel(endCall);
// Finally...return.
if (targetMethod.ReturnType != typeof(void))
{
generator.Emit(OpCodes.Ldloc, returnValue);
}
generator.Emit(OpCodes.Ret);
}
}
}
private static MethodBuilder BuildOnBeforeMethodInvocation(
TypeBuilder proxyBuilder, FieldBuilder invokeHandlers, TypeDebugging debug)
{
var arguments = new Type[] { typeof(MethodBase), typeof(object[]) };
var method = proxyBuilder.DefineMethod(OnBeforeMethodInvocationMethod,
MethodAttributes.Private | MethodAttributes.HideBySig, CallingConventions.HasThis,
typeof(bool), arguments);
method.DefineParameter(1, ParameterAttributes.In, "currentMethod");
method.DefineParameter(2, ParameterAttributes.In, "arguments");
using (var generator = debug.GetMethodDebugging(method))
{
var callMethod = generator.DeclareLocal(typeof(bool));
var i = generator.DeclareLocal(typeof(Int32));
var doNextHandler = generator.DefineLabel();
var incrementI = generator.DefineLabel();
var finish = generator.DefineLabel();
// Initial local setup.
// i = 0
generator.Emit(OpCodes.Ldc_I4_0);
generator.Emit(OpCodes.Stloc, i);
// BeforeInvocationHandler Iteration
// Call BeforeInvocationHandler on each IL ref
// in invokeHandlers.
generator.MarkLabel(doNextHandler);
// Load the next handler.
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, invokeHandlers);
generator.Emit(OpCodes.Ldloc, i);
generator.Emit(OpCodes.Ldelem_Ref);
// Load the handler's arguments.
generator.Emit(OpCodes.Ldarg_1);
generator.Emit(OpCodes.Ldarg_2);
// BeforeInvocationHandler.
generator.Emit(OpCodes.Callvirt,
typeof(IInvocationHandler).GetMethod(BeforeInvocation));
generator.Emit(OpCodes.Stloc, callMethod);
generator.Emit(OpCodes.Ldloc, callMethod);
// If the return value == false, stop loop.
generator.Emit(OpCodes.Brtrue, incrementI);
generator.Emit(OpCodes.Br, finish);
// Increment i.
generator.MarkLabel(incrementI);
generator.Emit(OpCodes.Ldloc, i);
generator.Emit(OpCodes.Ldc_I4_1);
generator.Emit(OpCodes.Add);
generator.Emit(OpCodes.Stloc, i);
// See if i < invokeHandlers.Length.
generator.Emit(OpCodes.Ldloc, i);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, invokeHandlers);
generator.Emit(OpCodes.Ldlen);
generator.Emit(OpCodes.Conv_I4);
generator.Emit(OpCodes.Blt, doNextHandler);
// Exit loop.
generator.MarkLabel(finish);
// Put callMethod on the stack and return.
generator.Emit(OpCodes.Ldloc, callMethod);
generator.Emit(OpCodes.Ret);
}
return method;
}
private static MethodBuilder BuildOnBeforeMethodInvocation(
TypeBuilder proxyBuilder, FieldBuilder invokeHandlers, TypeDebugging debug)
{
var arguments = new Type[] { typeof(MethodBase), typeof(object[]) };
var method = proxyBuilder.DefineMethod(OnBeforeMethodInvocationMethod,
MethodAttributes.Private | MethodAttributes.HideBySig, CallingConventions.HasThis,
typeof(bool), arguments);
method.DefineParameter(1, ParameterAttributes.In, "currentMethod");
method.DefineParameter(2, ParameterAttributes.In, "arguments");
using (var generator = debug.GetMethodDebugging(method))
{
var callMethod = generator.DeclareLocal(typeof(bool));
var i = generator.DeclareLocal(typeof(Int32));
var doNextHandler = generator.DefineLabel();
var incrementI = generator.DefineLabel();
var finish = generator.DefineLabel();
// Initial local setup.
// i = 0
generator.Emit(OpCodes.Ldc_I4_0);
generator.Emit(OpCodes.Stloc, i);
// BeforeInvocationHandler Iteration
// Call BeforeInvocationHandler on each IL ref
// in invokeHandlers.
generator.MarkLabel(doNextHandler);
// Load the next handler.
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, invokeHandlers);
generator.Emit(OpCodes.Ldloc, i);
generator.Emit(OpCodes.Ldelem_Ref);
// Load the handler's arguments.
generator.Emit(OpCodes.Ldarg_1);
generator.Emit(OpCodes.Ldarg_2);
// BeforeInvocationHandler.
generator.Emit(OpCodes.Callvirt,
typeof(IInvocationHandler).GetMethod(BeforeInvocation));
generator.Emit(OpCodes.Stloc, callMethod);
generator.Emit(OpCodes.Ldloc, callMethod);
// If the return value == false, stop loop.
generator.Emit(OpCodes.Brtrue, incrementI);
generator.Emit(OpCodes.Br, finish);
// Increment i.
generator.MarkLabel(incrementI);
generator.Emit(OpCodes.Ldloc, i);
generator.Emit(OpCodes.Ldc_I4_1);
generator.Emit(OpCodes.Add);
generator.Emit(OpCodes.Stloc, i);
// See if i < invokeHandlers.Length.
generator.Emit(OpCodes.Ldloc, i);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, invokeHandlers);
generator.Emit(OpCodes.Ldlen);
generator.Emit(OpCodes.Conv_I4);
generator.Emit(OpCodes.Blt, doNextHandler);
// Exit loop.
generator.MarkLabel(finish);
// Put callMethod on the stack and return.
generator.Emit(OpCodes.Ldloc, callMethod);
generator.Emit(OpCodes.Ret);
}
return(method);
}
private static void BuildTargetMethods(TypeBuilder proxyBuilder, MethodBuilder onBeforeMethodInvocation,
MethodBuilder onAfterMethodInvocation, Type targetType,
FieldBuilder wrappedObject, Dictionary <MethodInfo, MethodMappings> targets, TypeDebugging debug)
{
var methodAttribs = MethodAttributes.HideBySig |
MethodAttributes.Virtual | MethodAttributes.Private;
foreach (var target in targets)
{
var targetMethod = target.Key;
var arguments = new Type[targetMethod.GetParameters().Length];
for (int i = 0; i < targetMethod.GetParameters().Length; i++)
{
arguments[i] = targetMethod.GetParameters()[i].ParameterType;
}
var method = proxyBuilder.DefineMethod(
targetMethod.Name + Proxy.ProxyExtension, methodAttribs, targetMethod.ReturnType, arguments);
ProxyMethodBuilder.HandleGenericMethodArguments(targetMethod, method);
// Determine if this method should override
// the mapped method (OverridesInterfaceMethods == false)
// or a number of itf. methods (OverridesInterfaceMethods == true)
var mappings = target.Value;
if (!mappings.OverridesInterfaceMethods)
{
proxyBuilder.DefineMethodOverride(method, targetMethod);
}
else
{
for (int itfs = 0; itfs < mappings.MappedMethods.Count; itfs++)
{
proxyBuilder.DefineMethodOverride(method, mappings.MappedMethods[itfs]);
}
}
using (var generator = debug.GetMethodDebugging(method))
{
var argumentValues = generator.DeclareLocal(typeof(object[]));
var callMethod = generator.DeclareLocal(typeof(bool));
generator.DeclareLocal(typeof(Type));
var generatedException = generator.DeclareLocal(typeof(Exception));
LocalBuilder returnValue = null;
var wrappedReturnValue = generator.DeclareLocal(typeof(object));
var baseMethod = generator.DeclareLocal(typeof(MethodBase));
var endCall = generator.DefineLabel();
// Check for a return value.
if (targetMethod.ReturnType != typeof(void))
{
returnValue = generator.DeclareLocal(targetMethod.ReturnType);
}
generator.Emit(OpCodes.Ldnull);
generator.Emit(OpCodes.Stloc, generatedException);
generator.Emit(OpCodes.Ldc_I4, targetMethod.GetParameters().Length);
generator.Emit(OpCodes.Newarr, typeof(object));
generator.Emit(OpCodes.Stloc, argumentValues);
// Get the target method.
generator.Emit(OpCodes.Ldtoken, targetMethod);
if (targetType.IsGenericType)
{
generator.Emit(OpCodes.Ldtoken, targetType);
generator.Emit(OpCodes.Call,
typeof(MethodBase).GetMethod(GetMethodFromHandleMethod,
new Type[] { typeof(RuntimeMethodHandle), typeof(RuntimeTypeHandle) }));
}
else
{
generator.Emit(OpCodes.Call,
typeof(MethodBase).GetMethod(GetMethodFromHandleMethod,
new Type[] { typeof(RuntimeMethodHandle) }));
}
generator.Emit(OpCodes.Stloc, baseMethod);
// call OnBeforeMethodInvocation.
ProxyMethodBuilder.WindArguments(targetMethod, generator, argumentValues, true);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldloc, baseMethod);
generator.Emit(OpCodes.Ldloc, argumentValues);
generator.Emit(OpCodes.Call, onBeforeMethodInvocation);
generator.Emit(OpCodes.Stloc, callMethod);
ProxyMethodBuilder.UnwindArguments(targetMethod, generator, argumentValues, true);
// If the call should be cancelled, break to the end.
generator.Emit(OpCodes.Ldloc, callMethod);
generator.Emit(OpCodes.Brfalse, endCall);
// Call the real method.
generator.BeginExceptionBlock();
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, wrappedObject);
for (var argLoad = 0; argLoad < targetMethod.GetParameters().Length; argLoad++)
{
generator.Emit(OpCodes.Ldarg, argLoad + 1);
}
generator.Emit(OpCodes.Callvirt, targetMethod);
if (targetMethod.ReturnType != typeof(void))
{
generator.Emit(OpCodes.Stloc, returnValue);
}
// call OnAfterInvocation
ProxyMethodBuilder.WindArguments(targetMethod, generator, argumentValues, false);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldloc, baseMethod);
generator.Emit(OpCodes.Ldloc, argumentValues);
ProxyMethodBuilder.WrapReturnValue(targetMethod, generator, returnValue, wrappedReturnValue);
generator.Emit(OpCodes.Ldloc, generatedException);
generator.Emit(OpCodes.Call, onAfterMethodInvocation);
ProxyMethodBuilder.UnwrapReturnValue(targetMethod, generator, returnValue, wrappedReturnValue);
ProxyMethodBuilder.UnwindArguments(targetMethod, generator, argumentValues, false);
generator.BeginCatchBlock(typeof(Exception));
// call OnAfterInvocationWithException
generator.Emit(OpCodes.Stloc, generatedException);
ProxyMethodBuilder.WindArguments(targetMethod, generator, argumentValues, false);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldloc, baseMethod);
generator.Emit(OpCodes.Ldloc, argumentValues);
ProxyMethodBuilder.WrapReturnValue(targetMethod, generator, returnValue, wrappedReturnValue);
generator.Emit(OpCodes.Ldloc, generatedException);
generator.Emit(OpCodes.Call, onAfterMethodInvocation);
ProxyMethodBuilder.UnwrapReturnValue(targetMethod, generator, returnValue, wrappedReturnValue);
ProxyMethodBuilder.UnwindArguments(targetMethod, generator, argumentValues, false);
generator.EndExceptionBlock();
generator.MarkLabel(endCall);
// Finally...return.
if (targetMethod.ReturnType != typeof(void))
{
generator.Emit(OpCodes.Ldloc, returnValue);
}
generator.Emit(OpCodes.Ret);
}
}
}
private static MethodBuilder BuildOnAfterMethodInvocation(TypeBuilder proxyBuilder,
FieldBuilder invokeHandlers, TypeDebugging debug)
{
var arguments = new Type[] { typeof(MethodBase), typeof(object[]),
Type.GetType("System.Object&"), typeof(Exception) };
var method = proxyBuilder.DefineMethod(OnAfterMethodInvocationMethod,
MethodAttributes.Private | MethodAttributes.HideBySig,
CallingConventions.HasThis,
typeof(void), arguments);
method.DefineParameter(1, ParameterAttributes.In, "currentMethod");
method.DefineParameter(2, ParameterAttributes.In, "arguments");
method.DefineParameter(3, ParameterAttributes.In | ParameterAttributes.Out, "returnValue");
method.DefineParameter(4, ParameterAttributes.In, "generatedException");
using (var generator = debug.GetMethodDebugging(method))
{
var i = generator.DeclareLocal(typeof(Int32));
var throwException = generator.DeclareLocal(typeof(bool));
var doNextHandlerAfterEx = generator.DefineLabel();
var incrementIAfterEx = generator.DefineLabel();
// Reset i = 0;
generator.Emit(OpCodes.Ldc_I4_0);
generator.Emit(OpCodes.Stloc, i);
generator.MarkLabel(doNextHandlerAfterEx);
// Load the next handler.
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, invokeHandlers);
generator.Emit(OpCodes.Ldloc, i);
generator.Emit(OpCodes.Ldelem_Ref);
// Load the handler's arguments.
generator.Emit(OpCodes.Ldarg_1);
generator.Emit(OpCodes.Ldarg_2);
generator.Emit(OpCodes.Ldarg_3);
generator.Emit(OpCodes.Ldarg, 4);
// AfterInvocationHandler
generator.Emit(OpCodes.Callvirt,
typeof(IInvocationHandler).GetMethod(AfterInvocation));
// If the return value == true, rethrow generatedException.
generator.Emit(OpCodes.Stloc, throwException);
generator.Emit(OpCodes.Ldloc, throwException);
generator.Emit(OpCodes.Brfalse, incrementIAfterEx);
generator.Emit(OpCodes.Ldarg, 4);
generator.Emit(OpCodes.Throw);
// Increment i.
generator.MarkLabel(incrementIAfterEx);
generator.Emit(OpCodes.Ldloc, i);
generator.Emit(OpCodes.Ldc_I4_1);
generator.Emit(OpCodes.Add);
generator.Emit(OpCodes.Stloc, i);
// See if i < invokeHandlers.Length.
generator.Emit(OpCodes.Ldloc, i);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, invokeHandlers);
generator.Emit(OpCodes.Ldlen);
generator.Emit(OpCodes.Conv_I4);
generator.Emit(OpCodes.Blt, doNextHandlerAfterEx);
// Exit loop and return
generator.Emit(OpCodes.Ret);
}
return(method);
}