private DelegateInfo DelegateInfo()
{
if (delegateInfo != null)
{
return(delegateInfo);
}
Delegate del = Delegate;
MethodInfo methInfo = del.Method;
ParameterInfo[] paramInfos = methInfo.GetParameters();
DelegateParameter[] delParams = new DelegateParameter[paramInfos.Length];
for (int i = 0; i < paramInfos.Length; i++)
{
delParams[i] = new DelegateParameter()
{
ParameterType = paramInfos[i].ParameterType,
IsParams = (i == paramInfos.Length - 1) ? Attribute.IsDefined(paramInfos[i], typeof(ParamArrayAttribute)) : false
};
}
delegateInfo = new DelegateInfo()
{
Name = methInfo.Name, ReturnType = methInfo.ReturnType, Parameters = delParams
};
return(delegateInfo);
}
public void Invoke(ICpu cpu)
{
var args = new List <object>();
var paramArrayArgs = new List <Structure>();
// Will be true iff the lastmost parameter of the delegate is using the C# 'param' keyword and thus
// expects the remainder of the arguments marshalled together into one array object.
bool isParamArrayArg = false;
CpuUtility.ReverseStackArgs(cpu, false);
for (int i = 0; i < delInfo.Parameters.Length; ++i)
{
DelegateParameter paramInfo = delInfo.Parameters[i];
object arg = cpu.PopValueArgument();
Type argType = arg.GetType();
isParamArrayArg = i == delInfo.Parameters.Length - 1 && delInfo.Parameters[i].IsParams;
if (arg != null && arg.GetType() == CpuUtility.ArgMarkerType)
{
if (isParamArrayArg)
{
break; // with param arguments, you want to consume everything to the arg bottom - it's normal.
}
else
{
throw new KOSArgumentMismatchException(delInfo.Parameters.Length, delInfo.Parameters.Length - (i + 1));
}
}
// Either the expected type of this one parameter, or if it's a 'param' array as the last arg, then
// the expected type of that array's elements:
Type paramType = (paramInfo.IsParams ? paramInfo.ParameterType.GetElementType() : paramInfo.ParameterType);
// Parameter type-safe checking:
bool inheritable = paramType.IsAssignableFrom(argType);
if (!inheritable)
{
bool castError = false;
// If it's not directly assignable to the expected type, maybe it's "castable" to it:
try
{
arg = Convert.ChangeType(arg, Type.GetTypeCode(paramType));
}
catch (InvalidCastException)
{
throw new KOSCastException(argType, paramType);
}
catch (FormatException)
{
castError = true;
}
if (castError)
{
throw new Exception(string.Format("Argument {0}({1}) to method {2} should be {3} instead of {4}.", (delInfo.Parameters.Length - i), arg, delInfo.Name, paramType.Name, argType));
}
}
if (isParamArrayArg)
{
paramArrayArgs.Add(Structure.FromPrimitiveWithAssert(arg));
--i; // keep hitting the last item in the param list again and again until a forced break because of arg bottom marker.
}
else
{
args.Add(Structure.FromPrimitiveWithAssert(arg));
}
}
if (isParamArrayArg)
{
// collect the param array args that were at the end into the one single
// array item that will be sent to the method when invoked:
args.Add(paramArrayArgs.ToArray());
}
// Consume the bottom marker under the args, which had better be
// immediately under the args we just popped, or the count was off.
if (!isParamArrayArg) // A param array arg will have already consumed the arg bottom mark.
{
bool foundArgMarker = false;
int numExtraArgs = 0;
while (cpu.GetArgumentStackSize() > 0 && !foundArgMarker)
{
object marker = cpu.PopValueArgument();
if (marker != null && marker.GetType() == CpuUtility.ArgMarkerType)
{
foundArgMarker = true;
}
else
{
++numExtraArgs;
}
}
if (numExtraArgs > 0)
{
throw new KOSArgumentMismatchException(delInfo.Parameters.Length, delInfo.Parameters.Length + numExtraArgs);
}
}
// Delegate.DynamicInvoke expects a null, rather than an array of zero length, when
// there are no arguments to pass:
object[] argArray = (args.Count > 0) ? args.ToArray() : null;
object val = call(argArray);
if (delInfo.ReturnType == typeof(void))
{
value = ScalarValue.Create(0);
}
else
{
value = Structure.FromPrimitiveWithAssert(val);
}
}