//Adds a provided variable to the current scope or modifies an existing
//variable with the same name (this is required because match variables unlike
//regular variables in the same scope can shadow each other).
private int AddMatchVariable(string varName, ElaExpression exp, out bool newV)
{
var sv = ScopeVar.Empty;
newV = false;
//Here we first check if such a name is already added and if this is the case simply fetch an
//existing name.
if (CurrentScope.Parent != null && CurrentScope.Parent.Locals.TryGetValue(varName, out sv) &&
(sv.Flags & ElaVariableFlags.Parameter) == ElaVariableFlags.Parameter)
{
return(0 | sv.Address << 8);
}
else
{
var res = CurrentScope.TryChangeVariable(varName);
newV = true;
if (res != -1)
{
return(0 | res << 8);
}
return(AddVariable(varName, exp, ElaVariableFlags.None, -1));
}
}