public void RegisterFunction(string name, LibraryFunction functionRef, int numberOfRequiredParameters)
{
ExternalFunctionRef extFuncRef = new ExternalFunctionRef(name, functionRef, numberOfRequiredParameters);
// TODO: check for object redefinition
libraryData.Insert(name, new ExternalFunctionRefValue(extFuncRef));
}
public void RegisterGlobalFunction(string name, LibraryFunction functionRef, int numberOfRequiredParameters)
{
ExternalFunctionRef extFuncRef = new ExternalFunctionRef(name, functionRef, numberOfRequiredParameters);
// TODO: check for object redefinition
ValueStore functionObject = state.RegisterGlobalObject(name);
functionObject.Value = new ExternalFunctionRefValue(extFuncRef);
}
/// <summary>
/// Constructor, which initializes the new external-function-refference value with the desired refference.
/// </summary>
/// <param name="functionRef">An initialized and valid external function refference.</param>
public ExternalFunctionRefValue(ExternalFunctionRef functionRef)
{
valueType = ValueTypeID.TYPE_CFUNCTIONREF;
val = functionRef;
}
public override void Eval(EvaluatorState ev)
{
//Console.WriteLine(this.ToString());
// pointer to _argc
IValue argcValue = ev.Stack.ReadTop();
if (argcValue.TypeOf() != ValueTypeID.TYPE_NUMBER)
{
Console.WriteLine(">> exp. argc");
// TODO: add more specific error code here
throw new SharpNektonException(new SharpNektonError(SharpNektonErrorID.E_BADTYPE));
}
// get number of passed params
int numberOfPassedParams = (int)argcValue.GetNumericValue();
// functionref is stored on the stack[numparams] by pushp instuction,
// so GetVal() is not neccessary
IValue functionRefValue = ev.Stack.ReadN(ev.Stack.StackTop - (numberOfPassedParams + 1)); // n + 1 = count with _argc
switch (functionRefValue.TypeOf())
{
case ValueTypeID.TYPE_FUNCTIONREF:
// store the return address on the stack
ev.Stack.Push(new RTSAValue(ev.RegPC));
// check parameter counts
FunctionRef functionRef = (FunctionRef)functionRefValue.GetObjectValue();
if (CheckParams(functionRef.NumberOfDefinedParameters, numberOfPassedParams) == false)
{
throw new SharpNektonException(new SharpNektonError(SharpNektonErrorID.E_BADPARAMCOUNT));
}
// set PC to new address and test it
OpCodeListItem functionStartAddress = functionRef.CodePart.First();
if (functionStartAddress != null)
{
ev.RegPC = functionStartAddress;
}
else
{
// TODO: add more specific error code here
throw new SharpNektonException(new SharpNektonError(SharpNektonErrorID.E_BADJMPTARGET));
}
break;
case ValueTypeID.TYPE_CFUNCTIONREF:
// check parameter counts
ExternalFunctionRef extFunctionRef = (ExternalFunctionRef)functionRefValue.GetObjectValue();
if (CheckParams(extFunctionRef.NumberOfDefinedParameters, numberOfPassedParams) == false)
{
throw new SharpNektonException(new SharpNektonError(SharpNektonErrorID.E_BADPARAMCOUNT));
}
// call the function
extFunctionRef.FunctionRef(numberOfPassedParams);
break;
default:
//Console.WriteLine(">> type is {0}", functionRefValue.TypeOf().ToString());
throw new SharpNektonException(new SharpNektonError(SharpNektonErrorID.E_EXPTYPEFUNCREF));
}
}