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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) 2003-2012  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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/* Determine the data type on which another data type is based on.

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 * If a new default initial value is given, we DO NOT consider it a

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 * new base class, and continue looking further!

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 *

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 * E.g. TYPE new_int_t : INT; END_TYPE;

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 *      TYPE new_int2_t : INT = 2; END_TYPE;

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 *      TYPE new_subr_t : INT (4..5); END_TYPE;

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 *

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 *    new_int_t is really an INT!!

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 *    new_int2_t is also really an INT!!

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 *    new_subr_t is also really an INT!!

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 *

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 * Note that a FB declaration is also considered a base type, as

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 * we may have FB instances declared of a specific FB type.

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 */

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#include "absyntax_utils.hh"

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#include "../main.hh" // required for ERROR() and ERROR_MSG() macros.

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/* pointer to singleton instance */

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search_base_type_c *search_base_type_c::search_base_type_singleton = NULL;

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search_base_type_c::search_base_type_c(void) {current_basetype_name = NULL; current_basetype = NULL; current_equivtype = NULL;}

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/* static method! */

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void search_base_type_c::create_singleton(void) {

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  if (NULL == search_base_type_singleton)   search_base_type_singleton = new search_base_type_c();

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  if (NULL == search_base_type_singleton)   ERROR;

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}

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/* static method! */

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symbol_c *search_base_type_c::get_equivtype_decl(symbol_c *symbol) {

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  create_singleton();

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  if (NULL == symbol)    return NULL; 

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  search_base_type_singleton->current_basetype_name = NULL;

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  search_base_type_singleton->current_basetype  = NULL; 

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  search_base_type_singleton->current_equivtype = NULL; 

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  symbol_c *basetype = (symbol_c *)symbol->accept(*search_base_type_singleton);

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  if (NULL != search_base_type_singleton->current_equivtype)

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    return search_base_type_singleton->current_equivtype;

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  return basetype;

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}

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/* static method! */

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symbol_c *search_base_type_c::get_basetype_decl(symbol_c *symbol) {

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  create_singleton();

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  if (NULL == symbol)    return NULL; 

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  search_base_type_singleton->current_basetype_name = NULL;

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  search_base_type_singleton->current_basetype  = NULL; 

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  search_base_type_singleton->current_equivtype = NULL; 

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  return (symbol_c *)symbol->accept(*search_base_type_singleton);

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}

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/* static method! */

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symbol_c *search_base_type_c::get_basetype_id  (symbol_c *symbol) {

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  create_singleton();

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  if (NULL == symbol)    return NULL; 

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  search_base_type_singleton->current_basetype_name = NULL;

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  search_base_type_singleton->current_basetype  = NULL; 

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  search_base_type_singleton->current_equivtype = NULL; 

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  symbol->accept(*search_base_type_singleton);

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  return (symbol_c *)search_base_type_singleton->current_basetype_name;

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}

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/*************************/

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/* B.1 - Common elements */

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/*************************/

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/*******************************************/

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/* B 1.1 - Letters, digits and identifiers */

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/*******************************************/

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void *search_base_type_c::visit(identifier_c *type_name) {

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  symbol_c *type_decl;

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  this->current_basetype_name = type_name;

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  /* if we have reached this point, it is because the current_basetype is not yet pointing to the base datatype we are looking for,

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   * so we will be searching for the delcaration of the type named in type_name, which might be the base datatype (we search recursively!)

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   */

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  this->current_basetype  = NULL; 

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  /* look up the type declaration... */

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  type_decl = type_symtable.find_value(type_name);

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  if (type_decl != type_symtable.end_value())

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    return type_decl->accept(*this);

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  type_decl = function_block_type_symtable.find_value(type_name);

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  if (type_decl != function_block_type_symtable.end_value())

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    return type_decl->accept(*this);

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  /* Type declaration not found!! */

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    ERROR;

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  return NULL;

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}

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/*********************/

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/* B 1.2 - Constants */

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/*********************/

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/*********************************/

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/* B 1.2.XX - Reference Literals */

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/*********************************/

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/* defined in IEC 61131-3 v3 - Basically the 'NULL' keyword! */

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/* See the comment in fill_candidate_datatypes_c::visit(ref_value_null_literal_c) for reason why we use this symbol as a datatype! */

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void *search_base_type_c::visit(ref_value_null_literal_c *symbol) {return (void *)symbol;}

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/******************************/

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/* B 1.2.1 - Numeric Literals */

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/******************************/

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 /* Numeric literals without any explicit type cast have unknown data type, 

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  * so we continue considering them as their own basic data types until

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  * they can be resolved (for example, when using '30+x' where 'x' is a LINT variable, the

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  * numeric literal '30' must then be considered a LINT so the ADD function may be called

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  * with all inputs of the same data type.

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  * If 'x' were a SINT, then the '30' would have to be a SINT too!

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  */

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void *search_base_type_c::visit(real_c *symbol)                   {return (void *)symbol;}

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void *search_base_type_c::visit(neg_real_c *symbol)               {return (void *)symbol;}

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void *search_base_type_c::visit(integer_c *symbol)                {return (void *)symbol;}

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void *search_base_type_c::visit(neg_integer_c *symbol)            {return (void *)symbol;}

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void *search_base_type_c::visit(binary_integer_c *symbol)         {return (void *)symbol;}

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void *search_base_type_c::visit(octal_integer_c *symbol)          {return (void *)symbol;}

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void *search_base_type_c::visit(hex_integer_c *symbol)            {return (void *)symbol;}

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void *search_base_type_c::visit(boolean_true_c *symbol)           {return (void *)symbol;}

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void *search_base_type_c::visit(boolean_false_c *symbol)          {return (void *)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 *search_base_type_c::visit(time_type_name_c *symbol)         {return (void *)symbol;}

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void *search_base_type_c::visit(bool_type_name_c *symbol)         {return (void *)symbol;}

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void *search_base_type_c::visit(sint_type_name_c *symbol)         {return (void *)symbol;}

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void *search_base_type_c::visit(int_type_name_c *symbol)          {return (void *)symbol;}

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void *search_base_type_c::visit(dint_type_name_c *symbol)         {return (void *)symbol;}

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void *search_base_type_c::visit(lint_type_name_c *symbol)         {return (void *)symbol;}

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void *search_base_type_c::visit(usint_type_name_c *symbol)        {return (void *)symbol;}

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void *search_base_type_c::visit(uint_type_name_c *symbol)         {return (void *)symbol;}

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void *search_base_type_c::visit(udint_type_name_c *symbol)        {return (void *)symbol;}

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void *search_base_type_c::visit(ulint_type_name_c *symbol)        {return (void *)symbol;}

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void *search_base_type_c::visit(real_type_name_c *symbol)         {return (void *)symbol;}

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void *search_base_type_c::visit(lreal_type_name_c *symbol)        {return (void *)symbol;}

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void *search_base_type_c::visit(date_type_name_c *symbol)         {return (void *)symbol;}

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void *search_base_type_c::visit(tod_type_name_c *symbol)          {return (void *)symbol;}

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void *search_base_type_c::visit(dt_type_name_c *symbol)           {return (void *)symbol;}

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void *search_base_type_c::visit(byte_type_name_c *symbol)         {return (void *)symbol;}

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void *search_base_type_c::visit(word_type_name_c *symbol)         {return (void *)symbol;}

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void *search_base_type_c::visit(dword_type_name_c *symbol)        {return (void *)symbol;}

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void *search_base_type_c::visit(lword_type_name_c *symbol)        {return (void *)symbol;}

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void *search_base_type_c::visit(string_type_name_c *symbol)       {return (void *)symbol;}

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void *search_base_type_c::visit(wstring_type_name_c *symbol)      {return (void *)symbol;}

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/******************************************************/

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/* Extensions to the base standard as defined in      */

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/* "Safety Software Technical Specification,          */

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/*  Part 1: Concepts and Function Blocks,             */

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/*  Version 1.0 – Official Release"                   */

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/* by PLCopen - Technical Committee 5 - 2006-01-31    */

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/******************************************************/

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void *search_base_type_c::visit(safetime_type_name_c *symbol)     {return (void *)symbol;}

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void *search_base_type_c::visit(safebool_type_name_c *symbol)     {return (void *)symbol;}

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void *search_base_type_c::visit(safesint_type_name_c *symbol)     {return (void *)symbol;}

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void *search_base_type_c::visit(safeint_type_name_c *symbol)      {return (void *)symbol;}

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void *search_base_type_c::visit(safedint_type_name_c *symbol)     {return (void *)symbol;}

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void *search_base_type_c::visit(safelint_type_name_c *symbol)     {return (void *)symbol;}

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void *search_base_type_c::visit(safeusint_type_name_c *symbol)    {return (void *)symbol;}

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void *search_base_type_c::visit(safeuint_type_name_c *symbol)     {return (void *)symbol;}

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void *search_base_type_c::visit(safeudint_type_name_c *symbol)    {return (void *)symbol;}

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void *search_base_type_c::visit(safeulint_type_name_c *symbol)    {return (void *)symbol;}

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void *search_base_type_c::visit(safereal_type_name_c *symbol)     {return (void *)symbol;}

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void *search_base_type_c::visit(safelreal_type_name_c *symbol)    {return (void *)symbol;}

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void *search_base_type_c::visit(safedate_type_name_c *symbol)     {return (void *)symbol;}

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void *search_base_type_c::visit(safetod_type_name_c *symbol)      {return (void *)symbol;}

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void *search_base_type_c::visit(safedt_type_name_c *symbol)       {return (void *)symbol;}

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void *search_base_type_c::visit(safebyte_type_name_c *symbol)     {return (void *)symbol;}

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void *search_base_type_c::visit(safeword_type_name_c *symbol)     {return (void *)symbol;}

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void *search_base_type_c::visit(safedword_type_name_c *symbol)    {return (void *)symbol;}

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void *search_base_type_c::visit(safelword_type_name_c *symbol)    {return (void *)symbol;}

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void *search_base_type_c::visit(safestring_type_name_c *symbol)   {return (void *)symbol;}

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void *search_base_type_c::visit(safewstring_type_name_c *symbol)  {return (void *)symbol;}

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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 *search_base_type_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 *search_base_type_c::visit(simple_spec_init_c *symbol) {

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  return symbol->simple_specification->accept(*this);

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}

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/*  subrange_type_name ':' subrange_spec_init */

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void *search_base_type_c::visit(subrange_type_declaration_c *symbol) {

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  this->current_equivtype = 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 *search_base_type_c::visit(subrange_spec_init_c *symbol) {

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  if (NULL == this->current_equivtype)

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    this->current_equivtype = symbol;

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  return symbol->subrange_specification->accept(*this);

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}

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/*  integer_type_name '(' subrange')' */

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void *search_base_type_c::visit(subrange_specification_c *symbol) {

   247

  if (NULL == this->current_equivtype)

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    this->current_equivtype = symbol;

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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 *search_base_type_c::visit(subrange_c *symbol)                                     {ERROR; return NULL;} /* should never get called... */

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/*  enumerated_type_name ':' enumerated_spec_init */

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void *search_base_type_c::visit(enumerated_type_declaration_c *symbol) {

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  this->current_basetype_name = symbol->enumerated_type_name;

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  /* NOTE: We want search_base_type_c to return a enumerated_type_declaration_c as the base datatpe if possible

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   *       (i.e. if it is a named datatype declared inside a TYPE ... END_TYPE declarations, as opposed to an

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   *        anonymous datatype declared in a VAR ... AND_VAR declaration).

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   *       However, we cannot return this symbol just yet, as it may not be the final base datatype.

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   *       So we store it in a temporary current_basetype variable!

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   */

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  this->current_basetype  = 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 *search_base_type_c::visit(enumerated_spec_init_c *symbol) {

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  // current_basetype may have been set in the previous enumerated_type_declaration_c visitor, in which case we do not want to overwrite the value!

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  if (NULL == this->current_basetype)

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    this->current_basetype  = symbol; 

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  /* NOTE: the following line may call either the visitor to 

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   *         - identifier_c, in which case this is not yet the base datatype we are looking for (it will set current_basetype to NULL!)

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   *         - enumerated_value_list_c, in which case we have found the base datatype.

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   */

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  return symbol->enumerated_specification->accept(*this); 

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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 *search_base_type_c::visit(enumerated_value_list_c *symbol) {

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  // current_basetype may have been set in the previous enumerated_type_declaration_c or enumerated_spec_init_c visitors, in which case we do not want to overwrite the value!

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  if (NULL == this->current_basetype) 

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    this->current_basetype  = symbol; 

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  return (void *)current_basetype;

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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 *search_base_type_c::visit(enumerated_value_c *symbol)                             {ERROR; return NULL;} /* should never get called... */

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/*  identifier ':' array_spec_init */

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void *search_base_type_c::visit(array_type_declaration_c *symbol) {

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  this->current_basetype_name = symbol->identifier;

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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 *search_base_type_c::visit(array_spec_init_c *symbol) {

   302

  /* Note that the 'array_specification' may be either an identifier of a previsously defined array type, 

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   * or an array_specification_c, so we can not stop here and simply return a array_spec_init_c, 

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   * especially if we are looking for the base class!

   305

   */  

   306

  return symbol->array_specification->accept(*this);

   307

}

   308

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/* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */

   310

void *search_base_type_c::visit(array_specification_c *symbol)                          {return (void *)symbol;}

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   312

/* helper symbol for array_specification */

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/* array_subrange_list ',' subrange */

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void *search_base_type_c::visit(array_subrange_list_c *symbol)                          {ERROR; return NULL;} /* should never get called... */

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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 *search_base_type_c::visit(array_initial_elements_list_c *symbol)                  {ERROR; return NULL;} /* should never get called... */

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   321

/* integer '(' [array_initial_element] ')' */

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/* array_initial_element may be NULL ! */

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void *search_base_type_c::visit(array_initial_elements_c *symbol)                       {ERROR; return NULL;} /* should never get called... */

   324

   325

/*  structure_type_name ':' structure_specification */

   326

/* NOTE: structure_specification will point to either a

   327

 *       initialized_structure_c

   328

 *       OR A

   329

 *       structure_element_declaration_list_c

   330

 */

   331

void *search_base_type_c::visit(structure_type_declaration_c *symbol)  {

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  this->current_basetype_name = symbol->structure_type_name;

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  return symbol->structure_specification->accept(*this);

   334

}

   335

   336

/*  var1_list ':' structure_type_name */

   337

void *search_base_type_c::visit(structured_var_declaration_c *symbol) {

   338

	return symbol;

   339

}

   340

   341

/* structure_type_name ASSIGN structure_initialization */

   342

/* structure_initialization may be NULL ! */

   343

void *search_base_type_c::visit(initialized_structure_c *symbol)	{

   344

  return symbol->structure_type_name->accept(*this);

   345

}

   346

   347

/* helper symbol for structure_declaration */

   348

/* structure_declaration:  STRUCT structure_element_declaration_list END_STRUCT */

   349

/* structure_element_declaration_list structure_element_declaration ';' */

   350

void *search_base_type_c::visit(structure_element_declaration_list_c *symbol)           {return (void *)symbol;}

   351

   352

/*  structure_element_name ':' *_spec_init */

   353

void *search_base_type_c::visit(structure_element_declaration_c *symbol)                {ERROR; return NULL;} /* should never get called... */

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   355

/* helper symbol for structure_initialization */

   356

/* structure_initialization: '(' structure_element_initialization_list ')' */

   357

/* structure_element_initialization_list ',' structure_element_initialization */

   358

void *search_base_type_c::visit(structure_element_initialization_list_c *symbol)        {ERROR; return NULL;} /* should never get called... */

   359

   360

/*  structure_element_name ASSIGN value */

   361

void *search_base_type_c::visit(structure_element_initialization_c *symbol)             {ERROR; return NULL;} /* should never get called... */

   362

   363

/*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */

   364

/*

   365

SYM_REF4(string_type_declaration_c,	string_type_name,

   366

					elementary_string_type_name,

   367

					string_type_declaration_size,

   368

					string_type_declaration_init) // may be == NULL!

   369

*/

   370

void *search_base_type_c::visit(string_type_declaration_c *symbol)                      {return (void *)symbol;}

   371

   372

   373

/*  function_block_type_name ASSIGN structure_initialization */

   374

/* structure_initialization -> may be NULL ! */

   375

// SYM_REF2(fb_spec_init_c, function_block_type_name, structure_initialization)

   376

void *search_base_type_c::visit(fb_spec_init_c *symbol)	{

   377

  return symbol->function_block_type_name->accept(*this);

   378

}

   379

   380

   381

   382

/* ref_spec:  REF_TO (non_generic_type_name | function_block_type_name) */

   383

// SYM_REF1(ref_spec_c, type_name)

   384

void *search_base_type_c::visit(ref_spec_c *symbol)                                     {return (void *)symbol;}

   385

   386

/* For the moment, we do not support initialising reference data types */

   387

/* ref_spec_init: ref_spec [ ASSIGN ref_initialization ]; */ 

   388

/* NOTE: ref_initialization may be NULL!! */

   389

// SYM_REF2(ref_spec_init_c, ref_spec, ref_initialization)

   390

void *search_base_type_c::visit(ref_spec_init_c *symbol) {

   391

  return symbol->ref_spec->accept(*this);

   392

}

   393

   394

/* ref_type_decl: identifier ':' ref_spec_init */

   395

// SYM_REF2(ref_type_decl_c, ref_type_name, ref_spec_init)

   396

void *search_base_type_c::visit(ref_type_decl_c *symbol)  {

   397

  this->current_basetype_name = symbol->ref_type_name;

   398

  return symbol->ref_spec_init->accept(*this);

   399

}

   400

   401

   402

   403

/*****************************/

   404

/* B 1.5.2 - Function Blocks */

   405

/*****************************/

   406

/*  FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */

   407

// SYM_REF3(function_block_declaration_c, fblock_name, var_declarations, fblock_body)

   408

void *search_base_type_c::visit(function_block_declaration_c *symbol)                   {

   409

	return (void *)symbol;

   410

}

   411

   412

   413

   414

/*********************************************/

   415

/* B.1.6  Sequential function chart elements */

   416

/*********************************************/

   417

/* INITIAL_STEP step_name ':' action_association_list END_STEP */

   418

// SYM_REF2(initial_step_c, step_name, action_association_list)

   419

void *search_base_type_c::visit(initial_step_c *symbol) {

   420

  this->current_basetype_name = NULL; /* this pseudo data type does not have a type name! */

   421

  return (void *)symbol;

   422

}

   423

   424

/* STEP step_name ':' action_association_list END_STEP */

   425

// SYM_REF2(step_c, step_name, action_association_list)

   426

void *search_base_type_c::visit(step_c *symbol) {

   427

  this->current_basetype_name = NULL; /* this pseudo data type does not have a type name! */

   428

  return (void *)symbol;

   429

}

   430