public override DynamicMetaObject FallbackInvoke(
DynamicMetaObject targetMO, DynamicMetaObject[] argMOs,
DynamicMetaObject errorSuggestion)
{
// First try COM binding.
DynamicMetaObject result;
if (ComBinder.TryBindInvoke(this, targetMO, argMOs, out result))
{
return result;
}
// Defer if any object has no value so that we evaulate their
// Expressions and nest a CallSite for the InvokeMember.
if (!targetMO.HasValue || argMOs.Any((a) => !a.HasValue))
{
var deferArgs = new DynamicMetaObject[argMOs.Length + 1];
for (int i = 0; i < argMOs.Length; i++)
{
deferArgs[i + 1] = argMOs[i];
}
deferArgs[0] = targetMO;
return Defer(deferArgs);
}
//Find our own binding.
if (targetMO.LimitType.IsSubclassOf(typeof(Delegate)))
{
var parms = targetMO.LimitType.GetMethod("Invoke").GetParameters();
if (parms.Length == argMOs.Length)
{
// Don't need to check if argument types match parameters.
// If they don't, users get an argument conversion error.
var callArgs = RuntimeHelpers.ConvertArguments(argMOs, parms);
var expression = Expression.Invoke(
Expression.Convert(targetMO.Expression, targetMO.LimitType),
callArgs);
return new DynamicMetaObject(
RuntimeHelpers.EnsureObjectResult(expression),
BindingRestrictions.GetTypeRestriction(targetMO.Expression,
targetMO.LimitType));
}
}
return errorSuggestion ??
RuntimeHelpers.CreateThrow(
targetMO, argMOs,
BindingRestrictions.GetTypeRestriction(targetMO.Expression,
targetMO.LimitType),
typeof(InvalidOperationException),
"Wrong number of arguments for function -- " +
targetMO.LimitType.ToString() + " got " + argMOs.ToString());
}
public override DynamicMetaObject FallbackInvokeMember(
DynamicMetaObject target, DynamicMetaObject[] args,
DynamicMetaObject errorSuggestion)
{
// First try COM binding.
DynamicMetaObject result;
if (ComBinder.TryBindInvokeMember(this, target, args, out result))
return result;
// Defer if any object has no value so that we evaulate their
// Expressions and nest a CallSite for the InvokeMember.
if (!target.HasValue || args.Any((a) => !a.HasValue))
{
var deferArgs = new DynamicMetaObject[args.Length + 1];
for (int i = 0; i < args.Length; i++)
{
deferArgs[i + 1] = args[i];
}
deferArgs[0] = target;
return Defer(deferArgs);
}
Func<DynamicMetaObject> getMethodNotFoundDMO = () => errorSuggestion ?? RuntimeHelpers.CreateThrow(target, args, RuntimeHelpers.GetTargetArgsRestrictions(target, args, false),
typeof(MissingMethodException), String.Format(RuntimeMessages.PublicMethodDoesNotExist_Method_Type, this.Name, target.Value.GetType()));
if (target.Value is HappyTypeTracker)
{
HappyTypeTracker typeTracker = (HappyTypeTracker) target.Value;
IHappyTracker found;
if (typeTracker.FindMemberTracker(this.Name, out found))
{
HappyMethodTracker tracker = found as HappyMethodTracker;
if(tracker == null)
{
return errorSuggestion ??
RuntimeHelpers.CreateThrow(
target, args, RuntimeHelpers.GetTargetArgsRestrictions(target, args, false),
typeof(MissingMemberException),
String.Format(RuntimeMessages.MemberIsNotInvokable_MemberNameTypeName, found.Name, typeTracker.Name), args.ToString());
}
return ResolveOverload(null, args, tracker.Methods, BindingRestrictions.GetInstanceRestriction(target.Expression, typeTracker));
}
return getMethodNotFoundDMO();
}
MethodInfo[] methods = target.Value.GetType().GetMethods(BindingFlags.Instance | BindingFlags.Public).Where(m => m.Name == Name).ToArray();
if(methods.Length != 0)
return this.ResolveOverload(target, args, methods);
return getMethodNotFoundDMO();
}
public override DynamicMetaObject FallbackInvokeMember(
DynamicMetaObject target,
DynamicMetaObject[] args,
DynamicMetaObject errorSuggestion)
{
if (!target.HasValue || args.Any((a) => !a.HasValue))
{
var deferArgs = new DynamicMetaObject[args.Length + 1];
for (var i = 0; i < args.Length; i++)
deferArgs[i + 1] = args[i];
deferArgs[0] = target;
return Defer(deferArgs);
}
// Find our own binding.
// Could consider allowing invoking static members from an instance.
const BindingFlags flags = BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.Public;
var members = target.LimitType.GetMember(Name, flags);
if ((members.Length == 1) && (members[0] is PropertyInfo || members[0] is FieldInfo))
{
// NEED TO TEST, should check for delegate value too
var mem = members[0];
throw new NotImplementedException();
//return new DynamicMetaObject(
// Expression.Dynamic(
// new SymplInvokeBinder(new CallInfo(args.Length)),
// typeof(object),
// args.Select(a => a.Expression).AddFirst(
// Expression.MakeMemberAccess(this.Expression, mem)));
// Don't test for eventinfos since we do nothing with them now.
}
else
{
// Get MethodInfos with right arg counts.
var methodInfos = members.
Select(m => m as MethodInfo).
Where(m => m.GetParameters().Length == args.Length);
// Get MethodInfos with param types that work for args. This works
// except for value args that need to pass to reftype params.
// We could detect that to be smarter and then explicitly StrongBox
// the args.
var res = new List<MethodInfo>();
foreach (var mem in methodInfos)
{
if (RuntimeHelper.ParametersMatchArguments(mem.GetParameters(), args))
res.Add(mem);
}
// False below means generate a type restriction on the MO.
// We are looking at the members target's Type.
var restrictions = RuntimeHelper.GetTargetArgsRestrictions(
target,
args,
false);
if (res.Count == 0)
{
return errorSuggestion ??
RuntimeHelper.CreateThrow(
target,
args,
restrictions,
typeof (MissingMemberException),
"Can't bind member invoke -- " + args.ToString());
}
// Could have tried just letting Expr.Call factory do the work,
// but if there is more than one applicable method using just
// assignablefrom, Expr.Call throws. It does not pick a "most
// applicable" method or any method.
var callArgs = new Expression[0];
return new DynamicMetaObject(
RuntimeHelper.EnsureObjectResult(
Expression.Call(
Expression.Convert(target.Expression, target.LimitType),
res[0],
callArgs)),
restrictions);
}
}
