mario@181: /*
msousa@265:  *  matiec - a compiler for the programming languages defined in IEC 61131-3
mario@181:  *
msousa@265:  *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
Edouard@279:  *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
mario@181:  *
msousa@265:  *  This program is free software: you can redistribute it and/or modify
msousa@265:  *  it under the terms of the GNU General Public License as published by
msousa@265:  *  the Free Software Foundation, either version 3 of the License, or
msousa@265:  *  (at your option) any later version.
msousa@265:  *
msousa@265:  *  This program is distributed in the hope that it will be useful,
msousa@265:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
msousa@265:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
msousa@265:  *  GNU General Public License for more details.
msousa@265:  *
msousa@265:  *  You should have received a copy of the GNU General Public License
msousa@265:  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
msousa@265:  *
mario@181:  *
mario@181:  * This code is made available on the understanding that it will not be
mario@181:  * used in safety-critical situations without a full and competent review.
mario@181:  */
mario@181: 
mario@181: /*
msousa@265:  * An IEC 61131-3 compiler.
mario@181:  *
mario@181:  * Based on the
mario@181:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
mario@181:  *
mario@181:  */
mario@181: 
mario@181: /* Determine the data type of a specific constant or variable.
mario@181:  * A reference to the relevant type definition is returned.
mario@181:  *
mario@181:  * For example:
mario@181:  *       22          -> returns reference to a int_type_name_c object.
mario@181:  *       22.2        -> returns reference to a real_type_name_c object.
mario@181:  *       LREAL#22.2  -> returns reference to a lreal_type_name_c object.
mario@181:  *       etc...
mario@181:  */
mario@181: 
mario@181: 
laurent@328: #include "../util/symtable.hh"
mario@181: #include "search_constant_type.hh"
mario@181: 
laurent@328: /* A symbol table with all values declared for enumerated type... */
laurent@328: /* Note that if the value is defined multiple times the value
laurent@328:  * is the null pointer.
laurent@328:  */
laurent@328: extern symbol_c null_symbol4;
laurent@328: extern symtable_c<symbol_c *, &null_symbol4> enumerated_value_symtable;
laurent@328: 
mario@181: #define ERROR error_exit(__FILE__,__LINE__)
mario@181: /* function defined in main.cc */
mario@181: extern void error_exit(const char *file_name, int line_no);
mario@181: 
mario@181: symbol_c *search_constant_type_c::get_type(symbol_c *constant) {
mario@181:   return (symbol_c *)constant->accept(*this);
mario@181: }
mario@181: 
mario@181: 
mario@181: /*********************/
mario@181: /* B 1.2 - Constants */
mario@181: /*********************/
mario@181: 
mario@181: /******************************/
mario@181: /* B 1.2.1 - Numeric Literals */
mario@181: /******************************/
ccb@202: /* Numeric literals without any explicit type cast have unknown data type, 
ccb@202:   * so we continue considering them as their own basic data types until
ccb@202:   * they can be resolved (for example, when using '30+x' where 'x' is a LINT variable, the
ccb@202:   * numeric literal '30' must then be considered a LINT so the ADD function may be called
ccb@202:   * with all inputs of the same data type.
ccb@202:   * If 'x' were a SINT, then the '30' would have to be a SINT too!
ccb@202:   */
ccb@202: void *search_constant_type_c::visit(real_c *symbol)           {return (void *)symbol;}
msousa@257: void *search_constant_type_c::visit(neg_real_c *symbol)       {return (void *)symbol;}
ccb@202: void *search_constant_type_c::visit(integer_c *symbol)        {return (void *)symbol;}
msousa@257: void *search_constant_type_c::visit(neg_integer_c *symbol)    {return (void *)symbol;}
ccb@202: void *search_constant_type_c::visit(binary_integer_c *symbol) {return (void *)symbol;}
ccb@202: void *search_constant_type_c::visit(octal_integer_c *symbol)  {return (void *)symbol;}
ccb@202: void *search_constant_type_c::visit(hex_integer_c *symbol)    {return (void *)symbol;}
mario@181: 
mario@181: void *search_constant_type_c::visit(integer_literal_c *symbol)
mario@181:   {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}
mario@181: void *search_constant_type_c::visit(real_literal_c *symbol)
mario@181:   {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}
mario@181: void *search_constant_type_c::visit(bit_string_literal_c *symbol)
mario@181:   {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}
mario@181: void *search_constant_type_c::visit(boolean_literal_c *symbol)
mario@181:   {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}
mario@181: 
ccb@202: void *search_constant_type_c::visit(boolean_true_c *symbol)   {return (void *)symbol;}
ccb@202: void *search_constant_type_c::visit(boolean_false_c *symbol)  {return (void *)symbol;}
ccb@202: 
ccb@202: 
mario@181: /*******************************/
mario@181: /* B.1.2.2   Character Strings */
mario@181: /*******************************/
mario@181: void *search_constant_type_c::visit(double_byte_character_string_c *symbol) {return (void *)&wstring_type_name;}
mario@181: void *search_constant_type_c::visit(single_byte_character_string_c *symbol) {return (void *)&string_type_name;}
mario@181: 
mario@181: /***************************/
mario@181: /* B 1.2.3 - Time Literals */
mario@181: /***************************/
mario@181: /************************/
mario@181: /* B 1.2.3.1 - Duration */
mario@181: /************************/
mario@181: void *search_constant_type_c::visit(neg_time_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */
msousa@257: void *search_constant_type_c::visit(duration_c *symbol) {return (void *)(symbol->type_name);}
mario@181: void *search_constant_type_c::visit(fixed_point_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */
mario@181: void *search_constant_type_c::visit(days_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */
mario@181: void *search_constant_type_c::visit(hours_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */
mario@181: void *search_constant_type_c::visit(minutes_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */
mario@181: void *search_constant_type_c::visit(seconds_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */
mario@181: void *search_constant_type_c::visit(milliseconds_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */
mario@181: 
mario@181: /************************************/
mario@181: /* B 1.2.3.2 - Time of day and Date */
mario@181: /************************************/
msousa@257: void *search_constant_type_c::visit(time_of_day_c *symbol) {return (void *)(symbol->type_name);}
mario@181: void *search_constant_type_c::visit(daytime_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */
msousa@257: void *search_constant_type_c::visit(date_c *symbol) {return (void *)(symbol->type_name);}
mario@181: void *search_constant_type_c::visit(date_literal_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */
msousa@257: void *search_constant_type_c::visit(date_and_time_c *symbol) {return (void *)(symbol->type_name);}
msousa@257: 
laurent@328: /********************************/
laurent@328: /* B 1.3.3 - Derived data types */
laurent@328: /********************************/
laurent@328: void *search_constant_type_c::visit(enumerated_value_c *symbol) {
laurent@328: 	if (symbol->type != NULL)
laurent@328: 		return (void *)(symbol->type);
laurent@328: 
laurent@328: 	symbol_c *value_type = enumerated_value_symtable.find_value(symbol->value);
laurent@328: 	if (value_type == enumerated_value_symtable.end_value()) ERROR;
laurent@328: 
laurent@328: 	return (void *)value_type;
laurent@328: }
mario@181: 
mario@181: real_type_name_c     search_constant_type_c::real_type_name;
mario@181: sint_type_name_c     search_constant_type_c::sint_type_name;
mario@181: lint_type_name_c     search_constant_type_c::lint_type_name;
mario@181: dint_type_name_c     search_constant_type_c::dint_type_name;
mario@181: date_type_name_c     search_constant_type_c::date_type_name;
ccb@202: dword_type_name_c    search_constant_type_c::dword_type_name;
ccb@202: dt_type_name_c       search_constant_type_c::dt_type_name;
ccb@202: tod_type_name_c      search_constant_type_c::tod_type_name;
ccb@202: udint_type_name_c    search_constant_type_c::udint_type_name;
mario@181: word_type_name_c     search_constant_type_c::word_type_name;
ccb@202: wstring_type_name_c  search_constant_type_c::wstring_type_name;
ccb@202: string_type_name_c   search_constant_type_c::string_type_name;
ccb@202: lword_type_name_c    search_constant_type_c::lword_type_name;
mario@181: uint_type_name_c     search_constant_type_c::uint_type_name;
ccb@202: lreal_type_name_c    search_constant_type_c::lreal_type_name;
mario@181: byte_type_name_c     search_constant_type_c::byte_type_name;
ccb@202: usint_type_name_c    search_constant_type_c::usint_type_name;
ccb@202: ulint_type_name_c    search_constant_type_c::ulint_type_name;
mario@181: bool_type_name_c     search_constant_type_c::bool_type_name;
mario@181: time_type_name_c     search_constant_type_c::time_type_name;
ccb@202: int_type_name_c      search_constant_type_c::int_type_name;
mario@181: 
msousa@257: // safebool_type_name_c    search_constant_type_c::safebool_type_name;
msousa@257:   /* The following is required because the expression (TOD_var - TOD_var) will result in a data type
msousa@257:    *  (in this case, TIME) that is neither of the expression elements...
msousa@257:    */
msousa@257: safetime_type_name_c     search_constant_type_c::safetime_type_name;
msousa@257: safetod_type_name_c      search_constant_type_c::safetod_type_name;
msousa@257: safedt_type_name_c       search_constant_type_c::safedt_type_name;
msousa@257: 
msousa@257: 
msousa@257: 
ccb@202: /* temporarily here until we remove the st_code_gen.c and il_code_gen.c files... */
ccb@202: /* It should then move to search_expression_type_c                               */
ccb@202: integer_c search_constant_type_c::integer("1");