absyntax_utils/type_initial_value.cc
author mjsousa
Wed, 17 Dec 2014 13:47:37 +0000
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child 971 8aee27d46208
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When generating C code, use the const_value of a symbolic_variable when it is used in a subrange.
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/*
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 *  matiec - a compiler for the programming languages defined in IEC 61131-3
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 *
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 *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
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 *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
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 *
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 *  This program is free software: you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation, either version 3 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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 *
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 * This code is made available on the understanding that it will not be
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 * used in safety-critical situations without a full and competent review.
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 */
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/*
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 * An IEC 61131-3 compiler.
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 *
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 * Based on the
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 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
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 *
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 */
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/*
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 * Determine the default initial value of a type declaration.
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 *
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 * This is part of the 4th stage that generates
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 * a c++ source program equivalent to the IL and ST
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 * code.
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 */
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/* Given a type definition declration, determine its default
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 * initial value. Note that types based on other types
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 * may have to iterate through each type it is based on
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 * to determine the initial value.
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 * E.g.
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 *  TYPE
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 *    A_t : INT := 10;
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 *    B_t : A_t := 20;
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 *    C_t : B_t;
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 *    D_t : C_t := 40;
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 *  END_TYPE
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 * Where the default initial value for C_t is 20!
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 */
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/* NOTE: The main program only needs one instance of
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 *       this class of object. This class
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 *       is therefore a singleton.
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 */
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#include "absyntax_utils.hh"
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//#define DEBUG
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#ifdef DEBUG
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#define TRACE(classname) printf("\n____%s____\n",classname);
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#else
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#define TRACE(classname)
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#endif
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type_initial_value_c *type_initial_value_c::instance(void) {
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  if (_instance != NULL)
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    return _instance;
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  _instance = new type_initial_value_c;
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  null_literal = new ref_value_null_literal_c();
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  real_0       = new real_c("0");
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  integer_0    = new integer_c("0");
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  integer_1    = new integer_c("1");
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  bool_0       = new boolean_literal_c(new bool_type_name_c(),new boolean_false_c());
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  /* FIXME: Our current implementation only allows dates from 1970 onwards,
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   * but the standard defines the date 0001-01-01 as the default value
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   * for the DATE data type. Untill we fix our implementation, we use 1970-01-01
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   * as our default value!!
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   */
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//date_literal_0 =  new date_literal_c(integer_1, integer_1, integer_1);
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  date_literal_0    = new date_literal_c(new integer_c("1970"), integer_1, integer_1);
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  daytime_literal_0 = new daytime_c(integer_0, integer_0, real_0);
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  time_0       = new duration_c     (new time_type_name_c(), NULL, new interval_c(NULL, NULL, NULL, integer_0, NULL));  // T#0s
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  date_0       = new date_c         (new date_type_name_c(), date_literal_0);  //  D#0001-01-01
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  tod_0        = new time_of_day_c  (new  tod_type_name_c(), daytime_literal_0);  //  TOD#00:00:00
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  dt_0         = new date_and_time_c(new   dt_type_name_c(), date_literal_0, daytime_literal_0);  //  DT#0001-01-01-00:00:00
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  string_0     = new single_byte_character_string_c("''");
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  wstring_0    = new double_byte_character_string_c("\"\"");
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  return _instance;
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}
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type_initial_value_c::type_initial_value_c(void) {}
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symbol_c *type_initial_value_c::get(symbol_c *type) {
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  TRACE("type_initial_value_c::get(): called ");
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  return (symbol_c *)type->accept(*type_initial_value_c::instance());
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}
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void *type_initial_value_c::handle_type_spec(symbol_c *base_type_name, symbol_c *type_spec_init) {
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  if (type_spec_init != NULL)
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     return type_spec_init;
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  /* no initial value specified, so we return the initial value of the type this type is based on... */
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  return base_type_name->accept(*this);
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}
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void *type_initial_value_c::handle_type_name(symbol_c *type_name) {
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  /* look up the type declaration... */
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  symbol_c *type_decl = type_symtable.find_value(type_name);
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    /* Type declaration not found!! */
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    /* NOTE: Variables declared out of function block 'data types',for eg:  VAR  timer: TON; END_VAR
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     * do not have a default value, so (TON) will never be found in the type symbol table. This means 
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     * we cannot simply consider this an error and abort, but must rather return a NULL.
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     */
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  if (type_decl == type_symtable.end_value())   return NULL;
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  return type_decl->accept(*this);
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}
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/* visitor for identifier_c should no longer be necessary. All references to derived datatypes are now stored in then          */
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/* AST using either poutype_identifier_c or derived_datatype_identifier_c. In principe, the following should not be necesasry  */
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void *type_initial_value_c::visit(                 identifier_c *symbol) {return handle_type_name(symbol);} /* should never occur */
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void *type_initial_value_c::visit(         poutype_identifier_c *symbol) {return handle_type_name(symbol);} /* in practice it might never get called, as FB, Functions and Programs do not have initial value  */
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void *type_initial_value_c::visit(derived_datatype_identifier_c *symbol) {return handle_type_name(symbol);}
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/***********************************/
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/* B 1.3.1 - Elementary Data Types */
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/***********************************/
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void *type_initial_value_c::visit(time_type_name_c *symbol)         {return (void *)time_0;}
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void *type_initial_value_c::visit(bool_type_name_c *symbol)         {return (void *)bool_0;}
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void *type_initial_value_c::visit(sint_type_name_c *symbol)         {return (void *)integer_0;}
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void *type_initial_value_c::visit(int_type_name_c *symbol)          {return (void *)integer_0;}
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void *type_initial_value_c::visit(dint_type_name_c *symbol)         {return (void *)integer_0;}
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void *type_initial_value_c::visit(lint_type_name_c *symbol)         {return (void *)integer_0;}
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void *type_initial_value_c::visit(usint_type_name_c *symbol)        {return (void *)integer_0;}
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void *type_initial_value_c::visit(uint_type_name_c *symbol)         {return (void *)integer_0;}
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void *type_initial_value_c::visit(udint_type_name_c *symbol)        {return (void *)integer_0;}
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void *type_initial_value_c::visit(ulint_type_name_c *symbol)        {return (void *)integer_0;}
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void *type_initial_value_c::visit(real_type_name_c *symbol)         {return (void *)real_0;}
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void *type_initial_value_c::visit(lreal_type_name_c *symbol)        {return (void *)real_0;}
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void *type_initial_value_c::visit(date_type_name_c *symbol)         {return (void *)date_0;}
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void *type_initial_value_c::visit(tod_type_name_c *symbol)          {return (void *)tod_0;}
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void *type_initial_value_c::visit(dt_type_name_c *symbol)           {return (void *)dt_0;}
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void *type_initial_value_c::visit(byte_type_name_c *symbol)         {return (void *)integer_0;}
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void *type_initial_value_c::visit(word_type_name_c *symbol)         {return (void *)integer_0;}
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void *type_initial_value_c::visit(dword_type_name_c *symbol)        {return (void *)integer_0;}
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void *type_initial_value_c::visit(lword_type_name_c *symbol)        {return (void *)integer_0;}
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void *type_initial_value_c::visit(string_type_name_c *symbol)       {return (void *)string_0;}
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void *type_initial_value_c::visit(wstring_type_name_c *symbol)      {return (void *)wstring_0;}
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void *type_initial_value_c::visit(safetime_type_name_c *symbol)     {return (void *)time_0;}
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void *type_initial_value_c::visit(safebool_type_name_c *symbol)     {return (void *)bool_0;}
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void *type_initial_value_c::visit(safesint_type_name_c *symbol)     {return (void *)integer_0;}
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void *type_initial_value_c::visit(safeint_type_name_c *symbol)      {return (void *)integer_0;}
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void *type_initial_value_c::visit(safedint_type_name_c *symbol)     {return (void *)integer_0;}
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void *type_initial_value_c::visit(safelint_type_name_c *symbol)     {return (void *)integer_0;}
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void *type_initial_value_c::visit(safeusint_type_name_c *symbol)    {return (void *)integer_0;}
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void *type_initial_value_c::visit(safeuint_type_name_c *symbol)     {return (void *)integer_0;}
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void *type_initial_value_c::visit(safeudint_type_name_c *symbol)    {return (void *)integer_0;}
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void *type_initial_value_c::visit(safeulint_type_name_c *symbol)    {return (void *)integer_0;}
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void *type_initial_value_c::visit(safereal_type_name_c *symbol)     {return (void *)real_0;}
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void *type_initial_value_c::visit(safelreal_type_name_c *symbol)    {return (void *)real_0;}
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void *type_initial_value_c::visit(safedate_type_name_c *symbol)     {return (void *)date_0;}
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void *type_initial_value_c::visit(safetod_type_name_c *symbol)      {return (void *)tod_0;}
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void *type_initial_value_c::visit(safedt_type_name_c *symbol)       {return (void *)dt_0;}
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void *type_initial_value_c::visit(safebyte_type_name_c *symbol)     {return (void *)integer_0;}
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void *type_initial_value_c::visit(safeword_type_name_c *symbol)     {return (void *)integer_0;}
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void *type_initial_value_c::visit(safedword_type_name_c *symbol)    {return (void *)integer_0;}
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void *type_initial_value_c::visit(safelword_type_name_c *symbol)    {return (void *)integer_0;}
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void *type_initial_value_c::visit(safestring_type_name_c *symbol)   {return (void *)string_0;}
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void *type_initial_value_c::visit(safewstring_type_name_c *symbol)  {return (void *)wstring_0;}
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/********************************/
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/* B 1.3.3 - Derived data types */
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/********************************/
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/*  simple_type_name ':' simple_spec_init */
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void *type_initial_value_c::visit(simple_type_declaration_c *symbol) {
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  return symbol->simple_spec_init->accept(*this);
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}
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/* simple_specification ASSIGN constant */
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void *type_initial_value_c::visit(simple_spec_init_c *symbol) {
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  return handle_type_spec(symbol->simple_specification, symbol->constant);
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}
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/*  subrange_type_name ':' subrange_spec_init */
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void *type_initial_value_c::visit(subrange_type_declaration_c *symbol) {
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  return symbol->subrange_spec_init->accept(*this);
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}
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/* subrange_specification ASSIGN signed_integer */
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void *type_initial_value_c::visit(subrange_spec_init_c *symbol) {
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  return handle_type_spec(symbol->subrange_specification, symbol->signed_integer);
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}
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/*  integer_type_name '(' subrange')' */
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void *type_initial_value_c::visit(subrange_specification_c *symbol) {
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 /* if no initial value explicitly given, then use the lowest value of the subrange */
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  if (symbol->subrange != NULL)
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    return symbol->subrange->accept(*this);
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  else
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    return symbol->integer_type_name->accept(*this);
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}
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/*  signed_integer DOTDOT signed_integer */
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void *type_initial_value_c::visit(subrange_c *symbol)	{return symbol->lower_limit;}
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/*  enumerated_type_name ':' enumerated_spec_init */
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void *type_initial_value_c::visit(enumerated_type_declaration_c *symbol) {
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  return symbol->enumerated_spec_init->accept(*this);
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}
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/* enumerated_specification ASSIGN enumerated_value */
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void *type_initial_value_c::visit(enumerated_spec_init_c *symbol) {
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  return handle_type_spec(symbol->enumerated_specification, symbol->enumerated_value);
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}
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/* helper symbol for enumerated_specification->enumerated_spec_init */
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/* enumerated_value_list ',' enumerated_value */
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void *type_initial_value_c::visit(enumerated_value_list_c *symbol) {
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  /* stage1_2 never creates an enumerated_value_list_c with no entries. If this occurs, then something must have changed! */
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  if (symbol->n <= 0) ERROR;
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 /* if no initial value explicitly given, then use the lowest value of the subrange */
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  return (void *)symbol->elements[0];
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}
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/* enumerated_type_name '#' identifier */
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// SYM_REF2(enumerated_value_c, type, value)
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void *type_initial_value_c::visit(enumerated_value_c *symbol)	{ERROR; return NULL;}
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/*  identifier ':' array_spec_init */
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void *type_initial_value_c::visit(array_type_declaration_c *symbol) {
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  return symbol->array_spec_init->accept(*this);
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}
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/* array_specification [ASSIGN array_initialization} */
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/* array_initialization may be NULL ! */
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void *type_initial_value_c::visit(array_spec_init_c *symbol) {
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  return handle_type_spec(symbol->array_specification, symbol->array_initialization);
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}
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/* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
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void *type_initial_value_c::visit(array_specification_c *symbol)	{
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  //symbol_c *init_value = (symbol_c *)symbol->non_generic_type_name->accept(*this);
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  /* Now build a array_initial_elements_list_c list, and populate it
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   * with 1 element of the array_initial_elements_c class
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   */
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  /* The array_initial_elements_c will contain a reference to the init_value,
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   * and another constant representing the number of elements in the array.
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   * In essence, we are building the equivilant of the following ST/IL code:
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   *    New_array_t : ARRAY [1..30, 51..60] of INT := [40(XXX)];
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   * from the user given code
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   *    New_array_t : ARRAY [1..30, 51..60] of INT;
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   * and replacing XXX with the default initial value of INT.
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   */
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  /* now we need to determine the number of elements in the array... */
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  /* Easier said than done, as the array may have a list of subranges, as in the
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   * example given above!!
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   */
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  /* TODO !!!!!*/
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  /* For now, just assume an array with 1 element.
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   * I (Mario) want to finish off this part of the code before getting boged down
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   * in something else...
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   */
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  // NOTE: We are leaking memory, as the integer will never get free'd!!
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  //integer_c *integer = new integer_c("1");
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  // NOTE: We are leaking memory, as the array_initial_elements will never get free'd!!
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  //array_initial_elements_c *array_initial_elements = new array_initial_elements_c(integer, init_value);
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  // NOTE: We are leaking memory, as the array_initial_elements_list will never get free'd!!
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  array_initial_elements_list_c *array_initial_elements_list  = new array_initial_elements_list_c();
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  //array_initial_elements_list->add_element(array_initial_elements);
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  return array_initial_elements_list;
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}
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/* helper symbol for array_specification */
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/* array_subrange_list ',' subrange */
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void *type_initial_value_c::visit(array_subrange_list_c *symbol)	{ERROR; return NULL;}
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/* array_initialization:  '[' array_initial_elements_list ']' */
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/* helper symbol for array_initialization */
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/* array_initial_elements_list ',' array_initial_elements */
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void *type_initial_value_c::visit(array_initial_elements_list_c *symbol)	{ERROR; return NULL;}
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/* integer '(' [array_initial_element] ')' */
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/* array_initial_element may be NULL ! */
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void *type_initial_value_c::visit(array_initial_elements_c *symbol)	{ERROR; return NULL;}
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/* TODO: from this point forward... */
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/*  structure_type_name ':' structure_specification */
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void *type_initial_value_c::visit(structure_type_declaration_c *symbol) {return NULL;}
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/* structure_type_name ASSIGN structure_initialization */
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/* structure_initialization may be NULL ! */
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void *type_initial_value_c::visit(initialized_structure_c *symbol)	{
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  return handle_type_spec(symbol->structure_type_name, symbol->structure_initialization);
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}
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/* helper symbol for structure_declaration */
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/* structure_declaration:  STRUCT structure_element_declaration_list END_STRUCT */
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/* structure_element_declaration_list structure_element_declaration ';' */
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void *type_initial_value_c::visit(structure_element_declaration_list_c *symbol)	{
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  structure_element_initialization_list_c *structure_element_initialization_list = new structure_element_initialization_list_c();
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  return structure_element_initialization_list;
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}
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/*  structure_element_name ':' *_spec_init */
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void *type_initial_value_c::visit(structure_element_declaration_c *symbol)	{return NULL;}
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/* helper symbol for structure_initialization */
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/* structure_initialization: '(' structure_element_initialization_list ')' */
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/* structure_element_initialization_list ',' structure_element_initialization */
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void *type_initial_value_c::visit(structure_element_initialization_list_c *symbol)	{return NULL;}
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/*  structure_element_name ASSIGN value */
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void *type_initial_value_c::visit(structure_element_initialization_c *symbol)	{return NULL;}
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/*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */
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/*
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 * NOTE:
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 * (Summary: Contrary to what is expected, the
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 *           string_type_declaration_c is not used to store
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 *           simple string type declarations that do not include
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 *           size limits.
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 *           For e.g.:
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 *             str1_type: STRING := "hello!"
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 *           will be stored in a simple_type_declaration_c
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 *           instead of a string_type_declaration_c.
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 *           The following:
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 *             str2_type: STRING [64] := "hello!"
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 *           will be stored in a sring_type_declaration_c
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 *
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 *           Read on for why this is done...
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 * End Summary)
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 *
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 * According to the spec, the valid construct
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 * TYPE new_str_type : STRING := "hello!"; END_TYPE
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 * has two possible routes to type_declaration...
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 *
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 * Route 1:
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 * type_declaration: single_element_type_declaration
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 * single_element_type_declaration: simple_type_declaration
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 * simple_type_declaration: identifier ':' simple_spec_init
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 * simple_spec_init: simple_specification ASSIGN constant
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 * (shift:  identifier <- 'new_str_type')
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 * simple_specification: elementary_type_name
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 * elementary_type_name: STRING
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 * (shift: elementary_type_name <- STRING)
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 * (reduce: simple_specification <- elementary_type_name)
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 * (shift: constant <- "hello!")
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 * (reduce: simple_spec_init: simple_specification ASSIGN constant)
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 * (reduce: ...)
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 *
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 *
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 * Route 2:
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 * type_declaration: string_type_declaration
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 * string_type_declaration: identifier ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init
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 * (shift:  identifier <- 'new_str_type')
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 * elementary_string_type_name: STRING
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 * (shift: elementary_string_type_name <- STRING)
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 * (shift: string_type_declaration_size <-  empty )
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 * string_type_declaration_init: ASSIGN character_string
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 * (shift: character_string <- "hello!")
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 * (reduce: string_type_declaration_init <- ASSIGN character_string)
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 * (reduce: string_type_declaration <- identifier ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init )
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 * (reduce: type_declaration <- string_type_declaration)
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 *
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 *
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 * At first glance it seems that removing route 1 would make
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 * the most sense. Unfortunately the construct 'simple_spec_init'
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 * shows up multiple times in other rules, so changing this construct
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 * would also mean changing all the rules in which it appears.
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 * I (Mario) therefore chose to remove route 2 instead. This means
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 * that the above declaration gets stored in a
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 * simple_type_declaration_c, and not in a string_type_declaration_c
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 * as would be expected!
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 */
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/*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */
433
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// SYM_REF4(string_type_declaration_c,	string_type_name,
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// 					elementary_string_type_name,
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// 					string_type_declaration_size,
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// 					string_type_declaration_init) /* may be == NULL! */
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void *type_initial_value_c::visit(string_type_declaration_c *symbol)	{
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  return handle_type_spec(symbol->elementary_string_type_name, symbol->string_type_declaration_init);
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}
181
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925
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/* REF_TO (non_generic_type_name | function_block_type_name) */
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void *type_initial_value_c::visit(ref_spec_c *symbol) {
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  return null_literal;
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}
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/* ref_spec [ ASSIGN ref_initialization ]; */
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/* NOTE: ref_initialization may be NULL!!  */
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void *type_initial_value_c::visit(ref_spec_init_c *symbol) {
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   390
  return handle_type_spec(symbol->ref_spec, symbol->ref_initialization);
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}
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/* identifier ':' ref_spec_init */
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   393
void *type_initial_value_c::visit(ref_type_decl_c *symbol) {
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   394
  return symbol->ref_spec_init->accept(*this);
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   395
}
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   403
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   404
type_initial_value_c            *type_initial_value_c::_instance         = NULL;
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   405
ref_value_null_literal_c        *type_initial_value_c::null_literal      = NULL;
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   406
real_c                          *type_initial_value_c::real_0            = NULL;
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   407
integer_c                       *type_initial_value_c::integer_0         = NULL;
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   408
integer_c                       *type_initial_value_c::integer_1         = NULL;
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   409
boolean_literal_c               *type_initial_value_c::bool_0            = NULL;
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   410
date_literal_c                  *type_initial_value_c::date_literal_0    = NULL;
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   411
daytime_c                       *type_initial_value_c::daytime_literal_0 = NULL;
a942c55fb769 Initialise REF_TO variables to NULL.
mjsousa
parents: 850
diff changeset
   412
duration_c                      *type_initial_value_c::time_0            = NULL;
a942c55fb769 Initialise REF_TO variables to NULL.
mjsousa
parents: 850
diff changeset
   413
date_c                          *type_initial_value_c::date_0            = NULL;
a942c55fb769 Initialise REF_TO variables to NULL.
mjsousa
parents: 850
diff changeset
   414
time_of_day_c                   *type_initial_value_c::tod_0             = NULL;
a942c55fb769 Initialise REF_TO variables to NULL.
mjsousa
parents: 850
diff changeset
   415
date_and_time_c                 *type_initial_value_c::dt_0              = NULL;
a942c55fb769 Initialise REF_TO variables to NULL.
mjsousa
parents: 850
diff changeset
   416
single_byte_character_string_c  *type_initial_value_c::string_0          = NULL;
a942c55fb769 Initialise REF_TO variables to NULL.
mjsousa
parents: 850
diff changeset
   417
double_byte_character_string_c  *type_initial_value_c::wstring_0         = NULL;