absyntax_utils/search_constant_type.cc
author Mario de Sousa <msousa@fe.up.pt>
Thu, 14 Jun 2012 12:00:19 +0100
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child 596 4efb11e44065
permissions -rw-r--r--
Clean up code (remove parsing of integers in stage 4).
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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(interval_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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invalid_type_name_c  search_constant_type_c::invalid_type_name;
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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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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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safedate_type_name_c     search_constant_type_c::safedate_type_name;
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safereal_type_name_c     search_constant_type_c::safereal_type_name;
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safesint_type_name_c     search_constant_type_c::safesint_type_name;
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safelint_type_name_c     search_constant_type_c::safelint_type_name;
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safedint_type_name_c     search_constant_type_c::safedint_type_name;
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safedword_type_name_c    search_constant_type_c::safedword_type_name;
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safeudint_type_name_c    search_constant_type_c::safeudint_type_name;
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safeword_type_name_c     search_constant_type_c::safeword_type_name;
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safewstring_type_name_c  search_constant_type_c::safewstring_type_name;
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safestring_type_name_c   search_constant_type_c::safestring_type_name;
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safelword_type_name_c    search_constant_type_c::safelword_type_name;
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safeuint_type_name_c     search_constant_type_c::safeuint_type_name;
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safelreal_type_name_c    search_constant_type_c::safelreal_type_name;
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safebyte_type_name_c     search_constant_type_c::safebyte_type_name;
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safeusint_type_name_c    search_constant_type_c::safeusint_type_name;
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safeulint_type_name_c    search_constant_type_c::safeulint_type_name;
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safebool_type_name_c     search_constant_type_c::safebool_type_name;
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safeint_type_name_c      search_constant_type_c::safeint_type_name;
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