private static DynamicMethod EmitDynamicMethod(Type rootType, string path, MethodDescription methodDesc, IEnumerable <Type> realParameterTypes, ICodecContainer codecContainer)
{
var dynamicMethod = new DynamicMethod("__dynproxy_" + path + "." + methodDesc,
methodDesc.ReturnType,
ConstructorParameterTypes.Concat(realParameterTypes).ToArray(),
Assembly.GetExecutingAssembly().ManifestModule, true);
var il = dynamicMethod.GetILGenerator();
var parameters = methodDesc.Parameters.Select((x, i) => new ParameterNecessity
{
Description = x,
Codec = codecContainer.GetEmittingCodecFor(x.Type),
ArgumentIndex = i + 3
}).ToArray();
var requestParameters = parameters
.Where(x => x.Description.Way == MethodParameterWay.Val || x.Description.Way == MethodParameterWay.Ref)
.ToArray();
var responseParameters = parameters
.Where(x => x.Description.Way == MethodParameterWay.Ref || x.Description.Way == MethodParameterWay.Out)
.ToArray();
bool hasRetval = methodDesc.ReturnType != typeof(void);
var locals = new LocalVariableCollection(il, responseParameters.Any() || hasRetval);
var dataArrayVar = il.DeclareLocal(typeof(byte[])); // byte[] dataArray
if (requestParameters.Any())
{
bool hasSizeOnStack = false;
foreach (var parameter in requestParameters)
{
switch (parameter.Description.Way)
{
case MethodParameterWay.Val:
parameter.Codec.EmitCalculateSize( // stack_0 += calculateSize(arg_i+1)
il, parameter.ArgumentIndex);
break;
case MethodParameterWay.Ref:
parameter.Codec.EmitCalculateSizeIndirect( // stack_0 += calculateSizeIndirect(arg_i+1)
il, parameter.ArgumentIndex, parameter.Description.Type);
break;
default:
throw new ArgumentOutOfRangeException();
}
if (hasSizeOnStack)
{
il.Emit(OpCodes.Add);
}
else
{
hasSizeOnStack = true;
}
}
il.Emit(OpCodes.Newarr, typeof(byte)); // dataArray = new byte[stack_0]
il.Emit(OpCodes.Stloc, dataArrayVar);
var dataPointerVar = // var pinned dataPointer = pin(dataArray)
il.Emit_PinArray(typeof(byte), dataArrayVar);
il.Emit(OpCodes.Ldloc, dataPointerVar); // data = dataPointer
il.Emit(OpCodes.Stloc, locals.DataPointer);
foreach (var parameter in requestParameters)
{
switch (parameter.Description.Way)
{
case MethodParameterWay.Val:
parameter.Codec.EmitEncode( // encode(arg_i+1)
il, locals, parameter.ArgumentIndex);
break;
case MethodParameterWay.Ref:
parameter.Codec.EmitEncodeIndirect( // encodeIndirect (arg_i+1)
il, locals, parameter.ArgumentIndex, parameter.Description.Type);
break;
default:
throw new ArgumentOutOfRangeException();
}
}
il.Emit_UnpinArray(dataPointerVar); // unpin(dataPointer)
}
else
{
il.Emit(OpCodes.Ldnull); // dataArray = null
il.Emit(OpCodes.Stloc, dataArrayVar);
}
il.Emit(OpCodes.Ldarg_0); // stack_0 = methodCallProcessor
il.Emit(OpCodes.Ldtoken, rootType); // stack_1 = typeof(T)
il.Emit(OpCodes.Call, GetTypeFromHandleMethod);
il.Emit(OpCodes.Ldstr, string.Format("{0}/{1}", // stack_2 = SuperServicePath/ServiceName/MethodName
path, methodDesc.Name));
il.Emit(OpCodes.Ldarg_1); // stack_3 = scope
il.Emit(OpCodes.Ldloc, dataArrayVar); // stack_4 = dataArray
il.Emit(OpCodes.Ldarg_2); // stack_5 = timeoutSettings
il.Emit(OpCodes.Callvirt, ProcessMethod); // stack_0 = stack_0.Process(stack_1, stack_2, stack_3, stack_4, stack_5)
if (responseParameters.Any() || hasRetval)
{
il.Emit(OpCodes.Stloc, dataArrayVar); // dataArray = stack_0
il.Emit(OpCodes.Ldloc, dataArrayVar); // remainingBytes = dataArray.Length
il.Emit(OpCodes.Ldlen);
il.Emit(OpCodes.Stloc, locals.RemainingBytes);
var dataPointerVar = // var pinned dataPointer = pin(dataArray)
il.Emit_PinArray(typeof(byte), dataArrayVar);
il.Emit(OpCodes.Ldloc, dataPointerVar); // data = dataPointer
il.Emit(OpCodes.Stloc, locals.DataPointer);
foreach (var parameter in responseParameters)
{
il.Emit(OpCodes.Ldarg, parameter.ArgumentIndex);// arg_i+1 = decode(data, remainingBytes, false)
parameter.Codec.EmitDecode(il, locals, false);
il.Emit_Stind(parameter.Description.Type);
}
if (hasRetval)
{
var retvalCodec = codecContainer.GetEmittingCodecFor(methodDesc.ReturnType);
retvalCodec.EmitDecode(il, locals, false); // stack_0 = decode(data, remainingBytes, false)
}
il.Emit_UnpinArray(dataPointerVar); // unpin(dataPointer)
}
else
{
il.Emit(OpCodes.Pop); // pop(stack_0)
}
il.Emit(OpCodes.Ret);
return(dynamicMethod);
}
public ServiceMethodHandler CreateMethodHandler(ServiceImplementationInfo serviceImplementationInfo, ServicePath servicePath)
{
var serviceInterface = serviceImplementationInfo.Description.Type;
var dynamicMethod = new DynamicMethod(
"__srpc__handle__" + serviceInterface.FullName + "__" + string.Join("_", servicePath),
typeof(byte[]), ParameterTypes, Assembly.GetExecutingAssembly().ManifestModule, true);
var il = dynamicMethod.GetILGenerator();
var locals = new LocalVariableCollection(il, true);
il.Emit(OpCodes.Ldarg_0); // stack_0 = (TServiceImplementation) arg_0
il.Emit(OpCodes.Castclass, serviceInterface);
var serviceDesc = serviceImplementationInfo.Description;
for (int i = 1; i < servicePath.Length - 1; i++)
{
var propertyInfo = serviceDesc.Type.GetProperty(servicePath[i]);
il.Emit(OpCodes.Callvirt, propertyInfo.GetGetMethod()); // stack_0 = stack_0.Property
SubserviceDescription subserviceDescription;
if (!serviceDesc.TryGetSubservice(servicePath[i], out subserviceDescription))
{
throw new InvalidPathException();
}
serviceDesc = subserviceDescription.Service;
}
var methodName = servicePath.MethodName;
MethodDescription methodDesc;
if (!serviceDesc.TryGetMethod(methodName, out methodDesc))
{
throw new InvalidPathException();
}
bool hasRetval = methodDesc.ReturnType != typeof(void);
var parameters = methodDesc.Parameters.Select((x, i) => new ParameterNecessity
{
Description = x,
Codec = codecContainer.GetEmittingCodecFor(x.Type),
LocalVariable = x.Way != MethodParameterWay.Val ? il.DeclareLocal(x.Type) : null,
ArgumentIndex = i
})
.ToArray();
var requestParameters = parameters
.Where(x => x.Description.Way == MethodParameterWay.Val || x.Description.Way == MethodParameterWay.Ref)
.ToArray();
var responseParameters = parameters
.Where(x => x.Description.Way == MethodParameterWay.Ref || x.Description.Way == MethodParameterWay.Out)
.ToArray();
LocalBuilder requestDataPointerVar = null;
if (requestParameters.Any())
{
il.Emit(OpCodes.Ldarg_1); // remainingBytes = arg_1.Length
il.Emit(OpCodes.Ldlen);
il.Emit(OpCodes.Stloc, locals.RemainingBytes);
requestDataPointerVar = // var pinned dataPointer = pin(arg_1)
il.Emit_PinArray(typeof(byte), 1);
il.Emit(OpCodes.Ldloc, requestDataPointerVar); // data = dataPointer
il.Emit(OpCodes.Stloc, locals.DataPointer);
}
foreach (var parameter in parameters)
{
switch (parameter.Description.Way)
{
case MethodParameterWay.Val:
parameter.Codec.EmitDecode(il, locals, false); // stack_i = decode(data, remainingBytes, false)
break;
case MethodParameterWay.Ref:
parameter.Codec.EmitDecode(il, locals, false); // param_i = decode(data, remainingBytes, false)
il.Emit(OpCodes.Stloc, parameter.LocalVariable);
il.Emit(OpCodes.Ldloca, parameter.LocalVariable); // stack_i = *param_i
break;
case MethodParameterWay.Out:
il.Emit(OpCodes.Ldloca, parameter.LocalVariable); // stack_i = *param_i
break;
default:
throw new ArgumentOutOfRangeException();
}
}
if (requestParameters.Any())
{
il.Emit_UnpinArray(requestDataPointerVar); // unpin(dataPointer)
}
il.Emit(OpCodes.Callvirt, methodDesc.MethodInfo); // stack_0 = stack_0.Method(stack_1, stack_2, ...)
if (hasRetval || responseParameters.Any())
{
IEmittingCodec retvalCodec = null;
LocalBuilder retvalVar = null;
if (hasRetval)
{
retvalCodec = codecContainer.GetEmittingCodecFor(methodDesc.ReturnType);
retvalVar = il.DeclareLocal(methodDesc.ReturnType); // var ret = stack_0
il.Emit(OpCodes.Stloc, retvalVar);
retvalCodec.EmitCalculateSize(il, retvalVar); // stack_0 = calculateSize(ret)
}
bool hasSizeOnStack = hasRetval;
foreach (var parameter in responseParameters)
{
parameter.Codec.EmitCalculateSize(il, parameter.LocalVariable); // stack_0 += calculateSize(param_i)
if (hasSizeOnStack)
{
il.Emit(OpCodes.Add);
}
else
{
hasSizeOnStack = true;
}
}
var dataArrayVar = il.DeclareLocal(typeof(byte[])); // var dataArray = new byte[size of retval]
il.Emit(OpCodes.Newarr, typeof(byte));
il.Emit(OpCodes.Stloc, dataArrayVar);
var responseDataPointerVar = // var pinned dataPointer = pin(dataArrayVar)
il.Emit_PinArray(typeof(byte), dataArrayVar);
il.Emit(OpCodes.Ldloc, responseDataPointerVar); // data = dataPointer
il.Emit(OpCodes.Stloc, locals.DataPointer);
foreach (var parameter in responseParameters)
{
parameter.Codec.EmitEncode(il, locals, parameter.LocalVariable);// encode(data, param_i)
}
if (hasRetval)
{
retvalCodec.EmitEncode(il, locals, retvalVar); // encode(data, ret)
}
il.Emit_UnpinArray(responseDataPointerVar); // unpin(dataPointer)
il.Emit(OpCodes.Ldloc, dataArrayVar); // stack_0 = dataArray
}
else
{
il.Emit(OpCodes.Ldc_I4, 0); // stack_0 = new byte[0]
il.Emit(OpCodes.Newarr, typeof(byte));
}
il.Emit(OpCodes.Ret);
return((ServiceMethodHandler)dynamicMethod.CreateDelegate(typeof(ServiceMethodHandler)));
}
