absyntax_utils/type_initial_value.hh
author mjsousa
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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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class type_initial_value_c : public null_visitor_c {
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  public:
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    static symbol_c *get(symbol_c *type);
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  private:
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    /* constants for the default values of elementary data types... */
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    static ref_value_null_literal_c       *null_literal;
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    static real_c                         *real_0;
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    static integer_c                      *integer_0, *integer_1;
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    static boolean_literal_c              *bool_0;
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    static date_literal_c                 *date_literal_0;
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    static daytime_c                      *daytime_literal_0;
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    static duration_c                     *time_0;
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    static date_c                         *date_0;
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    static time_of_day_c                  *tod_0;
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    static date_and_time_c                *dt_0;
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    static single_byte_character_string_c *string_0;
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    static double_byte_character_string_c *wstring_0;
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  protected:
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    type_initial_value_c(void);
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  private:
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    static type_initial_value_c *_instance;
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    static type_initial_value_c *instance(void);
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    void *handle_type_spec(symbol_c *base_type_name, symbol_c *type_spec_init);
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  private:
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    void *visit(identifier_c *type_name);
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    /***********************************/
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    /* B 1.3.1 - Elementary Data Types */
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    /***********************************/
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    void *visit(time_type_name_c *symbol);
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    void *visit(bool_type_name_c *symbol);
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    void *visit(sint_type_name_c *symbol);
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    void *visit(int_type_name_c *symbol);
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    void *visit(dint_type_name_c *symbol);
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    void *visit(lint_type_name_c *symbol);
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    void *visit(usint_type_name_c *symbol);
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    void *visit(uint_type_name_c *symbol);
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    void *visit(udint_type_name_c *symbol);
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    void *visit(ulint_type_name_c *symbol);
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    void *visit(real_type_name_c *symbol);
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    void *visit(lreal_type_name_c *symbol);
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    void *visit(date_type_name_c *symbol);
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    void *visit(tod_type_name_c *symbol);
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    void *visit(dt_type_name_c *symbol);
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    void *visit(byte_type_name_c *symbol);
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    void *visit(word_type_name_c *symbol);
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    void *visit(dword_type_name_c *symbol);
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    void *visit(lword_type_name_c *symbol);
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    void *visit(string_type_name_c *symbol);
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    void *visit(wstring_type_name_c *symbol);
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    void *visit(safetime_type_name_c *symbol);
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    void *visit(safebool_type_name_c *symbol);
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    void *visit(safesint_type_name_c *symbol);
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    void *visit(safeint_type_name_c *symbol);
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    void *visit(safedint_type_name_c *symbol);
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    void *visit(safelint_type_name_c *symbol);
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    void *visit(safeusint_type_name_c *symbol);
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    void *visit(safeuint_type_name_c *symbol);
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    void *visit(safeudint_type_name_c *symbol);
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    void *visit(safeulint_type_name_c *symbol);
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    void *visit(safereal_type_name_c *symbol);
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    void *visit(safelreal_type_name_c *symbol);
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    void *visit(safedate_type_name_c *symbol);
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    void *visit(safetod_type_name_c *symbol);
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    void *visit(safedt_type_name_c *symbol);
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    void *visit(safebyte_type_name_c *symbol);
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    void *visit(safeword_type_name_c *symbol);
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    void *visit(safedword_type_name_c *symbol);
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    void *visit(safelword_type_name_c *symbol);
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    void *visit(safestring_type_name_c *symbol);
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    void *visit(safewstring_type_name_c *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 *visit(simple_type_declaration_c *symbol);
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    /* simple_specification ASSIGN constant */
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    void *visit(simple_spec_init_c *symbol);
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    /*  subrange_type_name ':' subrange_spec_init */
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    void *visit(subrange_type_declaration_c *symbol);
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    /* subrange_specification ASSIGN signed_integer */
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    void *visit(subrange_spec_init_c *symbol);
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    /*  integer_type_name '(' subrange')' */
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    void *visit(subrange_specification_c *symbol);
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    /*  signed_integer DOTDOT signed_integer */
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    void *visit(subrange_c *symbol);
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    /*  enumerated_type_name ':' enumerated_spec_init */
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    void *visit(enumerated_type_declaration_c *symbol);
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    /* enumerated_specification ASSIGN enumerated_value */
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    void *visit(enumerated_spec_init_c *symbol);
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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 *visit(enumerated_value_list_c *symbol);
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    /* enumerated_type_name '#' identifier */
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    // SYM_REF2(enumerated_value_c, type, value)
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    void *visit(enumerated_value_c *symbol);
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    /*  identifier ':' array_spec_init */
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    void *visit(array_type_declaration_c *symbol);
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    /* array_specification [ASSIGN array_initialization} */
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    /* array_initialization may be NULL ! */
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    void *visit(array_spec_init_c *symbol);
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    /* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
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    void *visit(array_specification_c *symbol);
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    /* helper symbol for array_specification */
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    /* array_subrange_list ',' subrange */
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    void *visit(array_subrange_list_c *symbol);
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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 *visit(array_initial_elements_list_c *symbol);
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    /* integer '(' [array_initial_element] ')' */
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    /* array_initial_element may be NULL ! */
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    void *visit(array_initial_elements_c *symbol);
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    /*  structure_type_name ':' structure_specification */
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    void *visit(structure_type_declaration_c *symbol);
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    /* structure_type_name ASSIGN structure_initialization */
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    /* structure_initialization may be NULL ! */
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    void *visit(initialized_structure_c *symbol);
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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 *visit(structure_element_declaration_list_c *symbol);
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    /*  structure_element_name ':' *_spec_init */
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    void *visit(structure_element_declaration_c *symbol);
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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 *visit(structure_element_initialization_list_c *symbol);
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    /*  structure_element_name ASSIGN value */
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    void *visit(structure_element_initialization_c *symbol);
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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 */
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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 *visit(string_type_declaration_c *symbol);
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    /* REF_TO (non_generic_type_name | function_block_type_name) */
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    void *visit(ref_spec_c *symbol);
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    /* ref_spec [ ASSIGN ref_initialization ]; */
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    void *visit(ref_spec_init_c *symbol);
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    /* identifier ':' ref_spec_init */
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    void *visit(ref_type_decl_c *symbol);
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}; // type_initial_value_c
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