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/*

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 * (c) 2009 Mario de Sousa

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 *

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 * Offered to the public under the terms of the GNU General Public License

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 * as published by the Free Software Foundation; either version 2 of the

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 * License, or (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, but

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 * WITHOUT ANY WARRANTY; without even the implied warranty of

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General

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 * Public License for more details.

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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 IL and ST 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 size, in bits, of the data type.

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 * 

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 * NOTE: Currently, only elementary data types with well defined sizes (in the standard) are supported.

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 *       - derived data types are not supported, and these will return 0

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 *       - TIME, DATE, TIME_OF_DAY, and DATE_AND_TIME are not supported, and will return 0

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 *       - STRING and WSTRING are not supported, and the standard merely defines bit per character,

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 *              and not the maximum number of characters, so these will return 0

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 *

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 *       We also support the 'Numeric Literals' Data types.

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 *       i.e., numeric literals are considerd basic data types

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 *       as their data type is undefined (e.g. the datat type of '30'

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 *       could be 'INT' or 'SINT' or 'LINT' or 'USINT' or ...

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 *

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 *       For numeric literals, we return the minimum number of bits

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 *       required to store the value.

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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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 *    sizeof(SINT) ->  8

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 *    sizeof(INT)  -> 16

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 *    sizeof(DINT) -> 32

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 *    sizeof(LINT) -> 64

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 *

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 *    sizeof('1')       ->  1

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 *    sizeof('015')     ->  4    # Leading zeros are ignored!

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 *    sizeof('0')       ->  1    # This is a special case! Even the value 0 needs at least 1 bit to store!

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 *    sizeof('16')      ->  5

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 *    sizeof('2#00101') ->  3

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 *    sizeof('8#334')   ->  9

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 *    sizeof('16#2A')   ->  8

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 *

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 *    sizeof('7.4')     ->  32   # all real literals return 32 bits, the size of a 'REAL'

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 *                               # TODO: study IEC 60559 for the range of values that may be

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 *                               #       stored in a REAL (basic single width floating point format)

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 *                               #       and in a LREAL (basic double width floating point format)

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 *                               #       and see if some real literals need to return 64 instead!

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 */

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#include "../absyntax/visitor.hh"

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class get_sizeof_datatype_c: public null_visitor_c {

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  public:

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    static int getsize(symbol_c *data_type_symbol);

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    ~get_sizeof_datatype_c(void);

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  private:

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    /* this class is a singleton. So we need a pointer to the single instance... */

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    static get_sizeof_datatype_c *singleton;

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  private:

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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 *visit(real_c *symbol);

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    void *visit(integer_c *symbol);

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    void *visit(binary_integer_c *symbol);

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    void *visit(octal_integer_c *symbol);

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    void *visit(hex_integer_c *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 *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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    /******************************************************/

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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 *visit(safebool_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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#if 0

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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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      /* NOTE: structure_specification will point to either a

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       *       initialized_structure_c

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       *       OR A

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       *       structure_element_declaration_list_c

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       */

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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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  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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  */

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    void *visit(string_type_declaration_c *symbol);

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#endif

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}; // get_sizeof_datatype_c

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