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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) 2003-2012  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 on which another data type is based on. */

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/*

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 * What is a Base Type?

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 *    A base type is the fundamental data type from which the type is derived.

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 *    The main idea is that if two datatyes (A and B) share a common base type, 

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 *    then these two datatypes may be used interchangeably in an expression.

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 * 

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 * What is an Equivalent Type? 

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 *    An equivalent type is the data type from which the type is derived.

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 *    The Base type and the Equivalent type will always be the same, with the

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 *    exception of subranges!

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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_int3_t : new_int2_t := 3; END_TYPE;

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 *      TYPE new_sub_t  : INT (4..10); END_TYPE;

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 *      TYPE new_sub2_t : new_sub_t  := 5 ; END_TYPE;

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 *      TYPE new_sub3_t : new_sub2_t := 6 ; END_TYPE;

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 *      TYPE new_sub4_t : new_int3_t (4..10); END_TYPE;    <-----  This is NOT legal syntax!

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 *

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 *    new_int_t   : base type->INT          equivalent type->INT

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 *    new_int2_t  : base type->INT          equivalent type->INT

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 *    new_int3_t  : base type->INT          equivalent type->INT

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 *    new_sub_t   : base type->INT          equivalent type->new_sub_t

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 *    new_sub2_t  : base type->INT          equivalent type->new_sub_t

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 *    new_sub3_t  : base type->INT          equivalent type->new_sub_t

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 *

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 * Note too that a FB declaration is also considered a base type, as

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 * we may have FB instances declared of a specific FB type.

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 */

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class search_base_type_c: public null_visitor_c {

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  private:

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    symbol_c *current_basetype_name;

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    symbol_c *current_basetype;

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    symbol_c *current_equivtype;

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    static search_base_type_c *search_base_type_singleton; // Make this a singleton class!

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  private:  

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    static void create_singleton(void);

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  public:

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    search_base_type_c(void);

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    static symbol_c *get_equivtype_decl(symbol_c *symbol);  /* get the Equivalent Type declaration */

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    static symbol_c *get_basetype_decl (symbol_c *symbol);  /* get the Base       Type declaration */

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    static symbol_c *get_basetype_id   (symbol_c *symbol);  /* get the Base       Type identifier  */

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  public:

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

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  /* B.1 - Common elements */

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

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

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  /* B 1.1 - Letters, digits and identifiers */

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

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    void *visit(identifier_c *type_name);

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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(neg_real_c *symbol);

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    void *visit(integer_c *symbol);

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    void *visit(neg_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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    void *visit(boolean_true_c *symbol);

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    void *visit(boolean_false_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(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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      /* 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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  /*  var1_list ':' structure_type_name */

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    void *visit(structured_var_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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  /* function_block_type_name ASSIGN structure_initialization */

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  /* structure_initialization -> may be NULL ! */

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    void *visit(fb_spec_init_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);       // Defined in IEC 61131-3 v3

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  /* ref_spec [ ASSIGN ref_initialization ]; *//* NOTE: ref_initialization may be NULL!! */

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    void *visit(ref_spec_init_c *symbol);  // Defined in IEC 61131-3 v3

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  /* identifier ':' ref_spec_init */

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    void *visit(ref_type_decl_c *symbol);  // Defined in IEC 61131-3 v3

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

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  /* B 1.5.2 - Function Blocks */

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

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  /*  FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */

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  // SYM_REF3(function_block_declaration_c, fblock_name, var_declarations, fblock_body)

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    void *visit(function_block_declaration_c *symbol);

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

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  /* B.1.6  Sequential function chart elements */

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

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  /* INITIAL_STEP step_name ':' action_association_list END_STEP */

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  // SYM_REF2(initial_step_c, step_name, action_association_list)

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    void *visit(initial_step_c *symbol);

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  /* STEP step_name ':' action_association_list END_STEP */

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  // SYM_REF2(step_c, step_name, action_association_list)

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    void *visit(step_c *symbol);

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}; // search_base_type_c

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