private MethodInfo EmitFunctionMethod(TypeBuilder dcType, string methName, SchemaObject funcInfo, string objectPrefix, MethodAttributes accessibility)
{
FunctionGenerator generator = new FunctionGenerator(this, dcType, funcInfo, methName, accessibility);
if (generator.Method == null)
{
return null;
}
generator.AddAttributes(objectPrefix);
ILGenerator iLGenerator = generator.Method.GetILGenerator();
LocalBuilder local = iLGenerator.DeclareLocal(typeof(object[]));
iLGenerator.Emit(OpCodes.Ldarg_0);
iLGenerator.Emit(OpCodes.Ldarg_0);
iLGenerator.Emit(OpCodes.Call, typeof(MethodBase).GetMethod("GetCurrentMethod", BindingFlags.Public | BindingFlags.Static, null, Type.EmptyTypes, null));
iLGenerator.Emit(OpCodes.Castclass, typeof(MethodInfo));
iLGenerator.Emit(OpCodes.Ldc_I4, funcInfo.Parameters.Count);
iLGenerator.Emit(OpCodes.Newarr, typeof(object));
iLGenerator.Emit(OpCodes.Stloc, local);
int arg = 0;
foreach (Parameter parameter in funcInfo.Parameters)
{
iLGenerator.Emit(OpCodes.Ldloc, local);
iLGenerator.Emit(OpCodes.Ldc_I4, arg);
iLGenerator.Emit(OpCodes.Ldarg, (int) (arg + 1));
if (parameter.ClrType.IsValueType)
{
iLGenerator.Emit(OpCodes.Box, parameter.ClrType);
}
iLGenerator.Emit(OpCodes.Stelem_Ref);
arg++;
}
iLGenerator.Emit(OpCodes.Ldloc, local);
MethodInfo meth = typeof(DataContext).GetMethod((funcInfo is TableFunction) ? "CreateMethodCallQuery" : "ExecuteMethodCall", BindingFlags.NonPublic | BindingFlags.Instance, null, new Type[] { typeof(object), typeof(MethodInfo), typeof(object[]) }, null);
if (funcInfo is TableFunction)
{
meth = meth.MakeGenericMethod(new Type[] { generator.ResultType });
}
iLGenerator.Emit(OpCodes.Call, meth);
if (funcInfo is ScalarFunction)
{
iLGenerator.Emit(OpCodes.Callvirt, typeof(IExecuteResult).GetProperty("ReturnValue").GetGetMethod());
iLGenerator.Emit(generator.ResultType.IsValueType ? OpCodes.Unbox_Any : OpCodes.Castclass, generator.ResultType);
}
iLGenerator.Emit(OpCodes.Ret);
return generator.Method;
}
