private void Visit(VariableExpr variableExpr)
{
Symbol symbol = Symbols.Lookup(variableExpr.Identifier);
if (symbol != null)
{
variableExpr.VariableSymbol = symbol;
var currentFunction = FunctionStack.Peek();
if (!currentFunction.Locals.Contains(symbol) &&
!currentFunction.Parameters.Contains(symbol) &&
!currentFunction.FreeVariables.Contains(symbol))
{
FunctionStack.Peek().FreeVariables.Add(symbol);
}
TypeStack.Push(symbol.Type);
variableExpr.Type = symbol.Type;
}
else
{
AddError(string.Format("Undeclared variable '{0}'", variableExpr.Identifier), variableExpr);
TypeStack.Push(TypeInfo.BasicVoid);
}
}
