private void CreateMethod(ProxyClassBuildingContext classContext, string path, MethodDescription methodDesc)
{
var methodBuilder = classContext.Builder.DefineMethod(methodDesc.Name,
MethodAttributes.Public | MethodAttributes.Final | MethodAttributes.HideBySig |
MethodAttributes.NewSlot | MethodAttributes.Virtual);
var genericTypeParameterBuilders = methodDesc.GenericParameters.Any()
? methodBuilder.DefineGenericParameters(methodDesc.GenericParameters.Select(x => x.Name).ToArray())
: new GenericTypeParameterBuilder[0];
var genericTypeParameterCodecs = genericTypeParameterBuilders.Select(x => new ProxyMethodGenericArgumentCodec(x)).ToArray();
var genericArgumentMap = genericTypeParameterBuilders.ToDictionary(x => x.Name, x => (Type)x);
var parameterDescriptions = methodDesc.Parameters.Select(x => x.DeepSubstituteGenerics(genericArgumentMap)).ToArray();
var parameterTypesAdjustedForRefs = parameterDescriptions.Select(x => x.Way == MethodParameterWay.Val ? x.Type : x.Type.MakeByRefType()).ToArray();
var allParameterCodecs = parameterDescriptions.Select(x => new ProxyMethodParameterCodec(x)).ToArray();
var retvalType = methodDesc.ReturnType.DeepSubstituteGenerics(genericArgumentMap);
methodBuilder.SetParameters(parameterTypesAdjustedForRefs);
methodBuilder.SetReturnType(retvalType);
methodBuilder.SetImplementationFlags(MethodImplAttributes.Managed);
var il = new MyILGenerator(methodBuilder.GetILGenerator());
var emittingContext = new ProxyMethodEmittingContext(il, classContext.Fields);
var requestDataArrayVar = il.DeclareLocal(typeof(byte[])); // byte[] dataArray
var requestParametersCodecs = allParameterCodecs.Where(x => x.IsRequestParameter).ToArray();
if (requestParametersCodecs.Any() || genericTypeParameterBuilders.Any())
{
bool haveSizeOnStack = false;
foreach (var codec in genericTypeParameterCodecs)
{
codec.EmitCalculateSize(emittingContext); // stack_0 += CalculateSize(T_i)
EmitAddIf(il, ref haveSizeOnStack);
}
foreach (var parameter in requestParametersCodecs)
{
parameter.EmitCalculateSize(emittingContext); // stack_0 += CalculateSize(arg_i)
EmitAddIf(il, ref haveSizeOnStack);
}
il.Newarr(typeof(byte)); // dataArray = new byte[stack_0]
il.Stloc(requestDataArrayVar);
var pinnedVar = il.PinArray(typeof(byte), requestDataArrayVar); // var pinned dataPointer = pin(dataArray)
il.Ldloc(pinnedVar); // data = dataPointer
il.Stloc(emittingContext.DataPointerVar);
foreach (var codec in genericTypeParameterCodecs)
{
codec.EmitEncode(emittingContext); // Encode(T_i, data)
}
foreach (var codec in requestParametersCodecs)
{
codec.EmitEncode(emittingContext); // Encode(arg_i, data)
}
}
else
{
il.Ldnull(); // dataArray = null
il.Stloc(requestDataArrayVar);
}
il.Ldarg(0); // stack_0 = methodCallProcessor
il.Ldfld(classContext.Fields.Processor);
il.Ldtoken(classContext.InterfaceType); // stack_1 = typeof(T)
il.Call(TypeMethods.GetTypeFromHandle);
il.Ldstr(string.Format("{0}/{1}", path, methodDesc.Name)); // stack_2 = SuperServicePath/ServiceName/MethodName
il.Ldarg(0); // stack_3 = scope
il.Ldfld(classContext.Fields.Scope);
il.Ldloc(requestDataArrayVar); // stack_4 = dataArray
il.Ldarg(0); // stack_5 = timeoutSettings
il.Ldfld(classContext.Fields.TimeoutSettings);
var responseParameterCodecs = allParameterCodecs.Where(x => x.IsResponseParameter).ToArray();
if (responseParameterCodecs.Any() && methodDesc.RemotingType != MethodRemotingType.Direct)
{
throw new ArgumentException(string.Format("Error processing {0} method: only direct methods can have Ref or Out parameters", path));
}
switch (methodDesc.RemotingType)
{
case MethodRemotingType.Direct:
EmitProcessDirect(emittingContext, responseParameterCodecs, retvalType);
break;
case MethodRemotingType.AsyncVoid:
EmitProcessAsyncVoid(il);
break;
case MethodRemotingType.AsyncWithRetval:
EmitProcessAsyncWithRetval(classContext, emittingContext, methodDesc.Name, genericTypeParameterBuilders, retvalType);
break;
default:
throw new ArgumentOutOfRangeException();
}
il.Ret();
}