Use duplicate symtable instead of symtable for enum constant value table (this will later allow us to detect semantic errors in IEC 61131-3 source code)
(*
* matiec - a compiler for the programming languages defined in IEC 61131-3
*
* Copyright (C) 2003-2011 Mario de Sousa (msousa@fe.up.pt)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*
* This code is made available on the understanding that it will not be
* used in safety-critical situations without a full and competent review.
*)
(* This is the library containing the standard function blocks defined in the standard. *)
(* FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10) *)
(* The standard functions *)
{#include "standard_functions.txt" }
(* The standard function blocks *)
{#include "edge_detection.txt" }
{#include "bistable.txt" }
{#include "counter.txt" }
{#include "timer.txt" }
{#include "derivative_st.txt" }
{#include "hysteresis_st.txt" }
{#include "integral_st.txt" }
{#include "pid_st.txt" }
{#include "ramp_st.txt" }
{#include "rtc.txt" }
(* Not in the standard, but useful nonetheless. *)
{#include "sema.txt" }