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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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/* Determine the data type of a specific constant or variable.

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 * A reference to the relevant type definition is returned.

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 *

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 * For example:

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 *       22          -> returns reference to a int_type_name_c object.

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 *       22.2        -> returns reference to a real_type_name_c object.

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 *       LREAL#22.2  -> returns reference to a lreal_type_name_c object.

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 *       etc...

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 */

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#include "../util/symtable.hh"

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#include "search_constant_type.hh"

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#include "absyntax_utils.hh"

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#define ERROR error_exit(__FILE__,__LINE__)

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/* function defined in main.cc */

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extern void error_exit(const char *file_name, int line_no);

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symbol_c *search_constant_type_c::get_type(symbol_c *constant) {

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  return (symbol_c *)constant->accept(*this);

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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 1.2.1 - 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_constant_type_c::visit(real_c *symbol)           {return (void *)symbol;}

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

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

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

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

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

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

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void *search_constant_type_c::visit(integer_literal_c *symbol)

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  {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}

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void *search_constant_type_c::visit(real_literal_c *symbol)

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  {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}

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void *search_constant_type_c::visit(bit_string_literal_c *symbol)

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  {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}

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void *search_constant_type_c::visit(boolean_literal_c *symbol)

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  {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}

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

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

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

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/* B.1.2.2   Character Strings */

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

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void *search_constant_type_c::visit(double_byte_character_string_c *symbol) {return (void *)&wstring_type_name;}

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void *search_constant_type_c::visit(single_byte_character_string_c *symbol) {return (void *)&string_type_name;}

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

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/* B 1.2.3 - Time Literals */

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

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

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/* B 1.2.3.1 - Duration */

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

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void *search_constant_type_c::visit(neg_time_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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void *search_constant_type_c::visit(duration_c *symbol) {return (void *)(symbol->type_name);}

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void *search_constant_type_c::visit(fixed_point_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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void *search_constant_type_c::visit(days_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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void *search_constant_type_c::visit(hours_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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void *search_constant_type_c::visit(minutes_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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void *search_constant_type_c::visit(seconds_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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void *search_constant_type_c::visit(milliseconds_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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

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/* B 1.2.3.2 - Time of day and Date */

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

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void *search_constant_type_c::visit(time_of_day_c *symbol) {return (void *)(symbol->type_name);}

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void *search_constant_type_c::visit(daytime_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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void *search_constant_type_c::visit(date_c *symbol) {return (void *)(symbol->type_name);}

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void *search_constant_type_c::visit(date_literal_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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void *search_constant_type_c::visit(date_and_time_c *symbol) {return (void *)(symbol->type_name);}

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

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/* B 1.3.3 - Derived data types */

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

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void *search_constant_type_c::visit(enumerated_value_c *symbol) {

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  if (symbol->type != NULL)

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    return (void *)(symbol->type);

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  symbol_c *value_type = enumerated_value_symtable.find_value(symbol->value);

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  if (value_type == enumerated_value_symtable.end_value())

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    return NULL;

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  return (void *)value_type;

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}

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real_type_name_c     search_constant_type_c::real_type_name;

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sint_type_name_c     search_constant_type_c::sint_type_name;

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lint_type_name_c     search_constant_type_c::lint_type_name;

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dint_type_name_c     search_constant_type_c::dint_type_name;

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date_type_name_c     search_constant_type_c::date_type_name;

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dword_type_name_c    search_constant_type_c::dword_type_name;

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dt_type_name_c       search_constant_type_c::dt_type_name;

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tod_type_name_c      search_constant_type_c::tod_type_name;

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udint_type_name_c    search_constant_type_c::udint_type_name;

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word_type_name_c     search_constant_type_c::word_type_name;

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wstring_type_name_c  search_constant_type_c::wstring_type_name;

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string_type_name_c   search_constant_type_c::string_type_name;

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lword_type_name_c    search_constant_type_c::lword_type_name;

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uint_type_name_c     search_constant_type_c::uint_type_name;

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lreal_type_name_c    search_constant_type_c::lreal_type_name;

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byte_type_name_c     search_constant_type_c::byte_type_name;

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usint_type_name_c    search_constant_type_c::usint_type_name;

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ulint_type_name_c    search_constant_type_c::ulint_type_name;

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bool_type_name_c     search_constant_type_c::bool_type_name;

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time_type_name_c     search_constant_type_c::time_type_name;

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int_type_name_c      search_constant_type_c::int_type_name;

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// safebool_type_name_c    search_constant_type_c::safebool_type_name;

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  /* The following is required because the expression (TOD_var - TOD_var) will result in a data type

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   *  (in this case, TIME) that is neither of the expression elements...

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   */

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safetime_type_name_c     search_constant_type_c::safetime_type_name;

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safetod_type_name_c      search_constant_type_c::safetod_type_name;

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safedt_type_name_c       search_constant_type_c::safedt_type_name;

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/* temporarily here until we remove the st_code_gen.c and il_code_gen.c files... */

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/* It should then move to search_expression_type_c                               */

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integer_c search_constant_type_c::integer("1");

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real_c search_constant_type_c::real("1.0");