public override bool VisitTopLevelExternDef([NotNull] GamaParser.TopLevelExternDefContext context)
{
var name = context.Symbol().GetText();
var list = NamespaceContext.FindFunctionRefGlobal(name);
if (list == null)
{
list = new GamaFunctionList(name);
NamespaceContext.This.Functions.Add(list);
}
var retty = InstanceTypes.Void;
var rettyfqtn = context.typeName();
if (rettyfqtn != null)
{
retty = NamespaceContext.FindTypeRefGlobal(rettyfqtn);
if (retty == null)
{
GlobalContext.AddError(new ErrorTypeNotFound(context.typeName()));
return(false);
}
}
var ellipsis = context.ellipsis() != null;
var parmslist = new GamaParamList();
var argtypes = new GamaTypeRef[0];
var argtypesnative = new LLVMTypeRef[0];
var fqtnlist = context.typeList();
if (fqtnlist != null)
{
var types = fqtnlist.typeName();
argtypesnative = new LLVMTypeRef[types.Length];
argtypes = new GamaTypeRef[types.Length];
for (int i = 0; i < types.Length; i++)
{
var ty = NamespaceContext.FindTypeRefGlobal(types[i]);
if (ty == null)
{
GlobalContext.AddError(new ErrorTypeNotFound(types[i]));
return(false);
}
parmslist.Add(i.ToString(), ty); // Adding parameter with a numeric name, doesn't matter since this is a extern.
argtypes[i] = ty;
argtypesnative[i] = ty.UnderlyingType;
}
}
if (list.FindFunction(parmslist) != null)
{
GlobalContext.AddError(new ErrorDuplicateFunction(context));
return(false);
}
var fnty = new GamaFunction(retty, argtypes, LLVMTypeRef.CreateFunction(retty.UnderlyingType, argtypesnative, ellipsis), ellipsis);
var modfn = GlobalContext.Module.AddFunction(name, fnty.UnderlyingType);
var fnref = new GamaFunctionRef(retty, parmslist, fnty, modfn, false);
list.AddFunction(fnref);
return(true);
}
