mario@181: /*
msousa@265:  *  matiec - a compiler for the programming languages defined in IEC 61131-3
msousa@265:  *
msousa@417:  *  Copyright (C) 2003-2012  Mario de Sousa (msousa@fe.up.pt)
Edouard@279:  *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
msousa@265:  *
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: 
mjsousa@858: /* Determine the data type on which another data type is based on. */
mjsousa@858: 
mjsousa@858: /*
mjsousa@858:  * What is a Base Type?
mjsousa@858:  *    A base type is the fundamental data type from which the type is derived.
mjsousa@858:  *    The main idea is that if two datatyes (A and B) share a common base type, 
mjsousa@858:  *    then these two datatypes may be used interchangeably in an expression.
mjsousa@858:  * 
mjsousa@858:  * What is an Equivalent Type? 
mjsousa@858:  *    An equivalent type is the data type from which the type is derived.
mjsousa@858:  *    The Base type and the Equivalent type will always be the same, with the
mjsousa@858:  *    exception of subranges!
mjsousa@858:  *
mjsousa@858:  * E.g. TYPE new_int_t  : INT; END_TYPE;
mjsousa@858:  *      TYPE new_int2_t : INT := 2; END_TYPE;
mjsousa@858:  *      TYPE new_int3_t : new_int2_t := 3; END_TYPE;
mjsousa@858:  *      TYPE new_sub_t  : INT (4..10); END_TYPE;
mjsousa@858:  *      TYPE new_sub2_t : new_sub_t  := 5 ; END_TYPE;
mjsousa@858:  *      TYPE new_sub3_t : new_sub2_t := 6 ; END_TYPE;
mjsousa@858:  *      TYPE new_sub4_t : new_int3_t (4..10); END_TYPE;    <-----  This is NOT legal syntax!
mjsousa@858:  *
mjsousa@858:  *    new_int_t   : base type->INT          equivalent type->INT
mjsousa@858:  *    new_int2_t  : base type->INT          equivalent type->INT
mjsousa@858:  *    new_int3_t  : base type->INT          equivalent type->INT
mjsousa@858:  *    new_sub_t   : base type->INT          equivalent type->new_sub_t
mjsousa@858:  *    new_sub2_t  : base type->INT          equivalent type->new_sub_t
mjsousa@858:  *    new_sub3_t  : base type->INT          equivalent type->new_sub_t
mjsousa@858:  *
mjsousa@858:  * Note too that a FB declaration is also considered a base type, as
ccb@202:  * we may have FB instances declared of a specific FB type.
mario@181:  */
mario@181: 
mario@181: 
mario@181: class search_base_type_c: public null_visitor_c {
mario@181: 
mario@181:   private:
mjsousa@858:     symbol_c *current_basetype_name;
msousa@726:     symbol_c *current_basetype;
mjsousa@858:     symbol_c *current_equivtype;
msousa@718:     static search_base_type_c *search_base_type_singleton; // Make this a singleton class!
msousa@718:     
msousa@718:   private:  
msousa@718:     static void create_singleton(void);
mario@181: 
mario@181:   public:
mario@181:     search_base_type_c(void);
mjsousa@858:     static symbol_c *get_equivtype_decl(symbol_c *symbol);  /* get the Equivalent Type declaration */
mjsousa@858:     static symbol_c *get_basetype_decl (symbol_c *symbol);  /* get the Base       Type declaration */
mjsousa@858:     static symbol_c *get_basetype_id   (symbol_c *symbol);  /* get the Base       Type identifier  */
mario@181: 
mario@181:   public:
msousa@417:   /*************************/
msousa@417:   /* B.1 - Common elements */
msousa@417:   /*************************/
msousa@417:   /*******************************************/
msousa@417:   /* B 1.1 - Letters, digits and identifiers */
msousa@417:   /*******************************************/
msousa@417:     void *visit(identifier_c *type_name);
msousa@417: 
msousa@417:     
msousa@417:   /*********************/
msousa@417:   /* B 1.2 - Constants */
msousa@417:   /*********************/
msousa@417:   /******************************/
msousa@417:   /* B 1.2.1 - Numeric Literals */
msousa@417:   /******************************/
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 *visit(real_c *symbol);
msousa@257:     void *visit(neg_real_c *symbol);
ccb@202:     void *visit(integer_c *symbol);
msousa@257:     void *visit(neg_integer_c *symbol);
ccb@202:     void *visit(binary_integer_c *symbol);
ccb@202:     void *visit(octal_integer_c *symbol);
ccb@202:     void *visit(hex_integer_c *symbol);
msousa@257:     void *visit(boolean_true_c *symbol);
msousa@257:     void *visit(boolean_false_c *symbol);
ccb@202: 
ccb@202: 
mario@181:   /***********************************/
mario@181:   /* B 1.3.1 - Elementary Data Types */
mario@181:   /***********************************/
mario@181:     void *visit(time_type_name_c *symbol);
mario@181:     void *visit(bool_type_name_c *symbol);
mario@181:     void *visit(sint_type_name_c *symbol);
mario@181:     void *visit(int_type_name_c *symbol);
mario@181:     void *visit(dint_type_name_c *symbol);
mario@181:     void *visit(lint_type_name_c *symbol);
mario@181:     void *visit(usint_type_name_c *symbol);
mario@181:     void *visit(uint_type_name_c *symbol);
mario@181:     void *visit(udint_type_name_c *symbol);
mario@181:     void *visit(ulint_type_name_c *symbol);
mario@181:     void *visit(real_type_name_c *symbol);
mario@181:     void *visit(lreal_type_name_c *symbol);
mario@181:     void *visit(date_type_name_c *symbol);
mario@181:     void *visit(tod_type_name_c *symbol);
Laurent@706:     void *visit(dt_type_name_c *symbol);
mario@181:     void *visit(byte_type_name_c *symbol);
mario@181:     void *visit(word_type_name_c *symbol);
mario@181:     void *visit(dword_type_name_c *symbol);
mario@181:     void *visit(lword_type_name_c *symbol);
mario@181:     void *visit(string_type_name_c *symbol);
mario@181:     void *visit(wstring_type_name_c *symbol);
ccb@202: 
mario@181:     /******************************************************/
mario@181:     /* Extensions to the base standard as defined in      */
mario@181:     /* "Safety Software Technical Specification,          */
mario@181:     /*  Part 1: Concepts and Function Blocks,             */
mario@181:     /*  Version 1.0 – Official Release"                   */
mario@181:     /* by PLCopen - Technical Committee 5 - 2006-01-31    */
mario@181:     /******************************************************/
msousa@257:     void *visit(safetime_type_name_c *symbol);
mario@181:     void *visit(safebool_type_name_c *symbol);
msousa@257:     void *visit(safesint_type_name_c *symbol);
msousa@257:     void *visit(safeint_type_name_c *symbol);
msousa@257:     void *visit(safedint_type_name_c *symbol);
msousa@257:     void *visit(safelint_type_name_c *symbol);
msousa@257:     void *visit(safeusint_type_name_c *symbol);
msousa@257:     void *visit(safeuint_type_name_c *symbol);
msousa@257:     void *visit(safeudint_type_name_c *symbol);
msousa@257:     void *visit(safeulint_type_name_c *symbol);
msousa@257:     void *visit(safereal_type_name_c *symbol);
msousa@257:     void *visit(safelreal_type_name_c *symbol);
msousa@257:     void *visit(safedate_type_name_c *symbol);
msousa@257:     void *visit(safetod_type_name_c *symbol);
Laurent@706:     void *visit(safedt_type_name_c *symbol);
msousa@257:     void *visit(safebyte_type_name_c *symbol);
msousa@257:     void *visit(safeword_type_name_c *symbol);
msousa@257:     void *visit(safedword_type_name_c *symbol);
msousa@257:     void *visit(safelword_type_name_c *symbol);
msousa@257:     void *visit(safestring_type_name_c *symbol);
msousa@257:     void *visit(safewstring_type_name_c *symbol);
mario@181: 
mario@181:   /********************************/
mario@181:   /* B 1.3.3 - Derived data types */
mario@181:   /********************************/
mario@181:   /*  simple_type_name ':' simple_spec_init */
mario@181:     void *visit(simple_type_declaration_c *symbol);
mario@181:   /* simple_specification ASSIGN constant */
mario@181:     void *visit(simple_spec_init_c *symbol);
mario@181:   /*  subrange_type_name ':' subrange_spec_init */
mario@181:     void *visit(subrange_type_declaration_c *symbol);
mario@181:   /* subrange_specification ASSIGN signed_integer */
mario@181:     void *visit(subrange_spec_init_c *symbol);
mario@181:   /*  integer_type_name '(' subrange')' */
mario@181:     void *visit(subrange_specification_c *symbol);
mario@181:   /*  signed_integer DOTDOT signed_integer */
mario@181:     void *visit(subrange_c *symbol);
mario@181: 
mario@181:   /*  enumerated_type_name ':' enumerated_spec_init */
mario@181:     void *visit(enumerated_type_declaration_c *symbol);
mario@181:   /* enumerated_specification ASSIGN enumerated_value */
mario@181:     void *visit(enumerated_spec_init_c *symbol);
mario@181:   /* helper symbol for enumerated_specification->enumerated_spec_init */
mario@181:   /* enumerated_value_list ',' enumerated_value */
mario@181:     void *visit(enumerated_value_list_c *symbol);
mario@181:   /* enumerated_type_name '#' identifier */
mario@181:   // SYM_REF2(enumerated_value_c, type, value)
mario@181:     void *visit(enumerated_value_c *symbol);
mario@181:   /*  identifier ':' array_spec_init */
mario@181:     void *visit(array_type_declaration_c *symbol);
mario@181:   /* array_specification [ASSIGN array_initialization} */
mario@181:   /* array_initialization may be NULL ! */
mario@181:     void *visit(array_spec_init_c *symbol);
mario@181:   /* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
mario@181:     void *visit(array_specification_c *symbol);
mario@181:   /* helper symbol for array_specification */
mario@181:   /* array_subrange_list ',' subrange */
mario@181:     void *visit(array_subrange_list_c *symbol);
mario@181:   /* array_initialization:  '[' array_initial_elements_list ']' */
mario@181:   /* helper symbol for array_initialization */
mario@181:   /* array_initial_elements_list ',' array_initial_elements */
mario@181:     void *visit(array_initial_elements_list_c *symbol);
mario@181:   /* integer '(' [array_initial_element] ')' */
mario@181:   /* array_initial_element may be NULL ! */
mario@181:     void *visit(array_initial_elements_c *symbol);
mario@181:   /*  structure_type_name ':' structure_specification */
mario@181:       /* NOTE: structure_specification will point to either a
mario@181:        *       initialized_structure_c
mario@181:        *       OR A
mario@181:        *       structure_element_declaration_list_c
mario@181:        */
mario@181:     void *visit(structure_type_declaration_c *symbol);
Laurent@412:   /*  var1_list ':' structure_type_name */
Laurent@412:     void *visit(structured_var_declaration_c *symbol);
mario@181:   /* structure_type_name ASSIGN structure_initialization */
mario@181:   /* structure_initialization may be NULL ! */
mario@181:     void *visit(initialized_structure_c *symbol);
mario@181:   /* helper symbol for structure_declaration */
mario@181:   /* structure_declaration:  STRUCT structure_element_declaration_list END_STRUCT */
mario@181:   /* structure_element_declaration_list structure_element_declaration ';' */
mario@181:     void *visit(structure_element_declaration_list_c *symbol);
mario@181:   /*  structure_element_name ':' *_spec_init */
mario@181:     void *visit(structure_element_declaration_c *symbol);
mario@181:   /* helper symbol for structure_initialization */
mario@181:   /* structure_initialization: '(' structure_element_initialization_list ')' */
mario@181:   /* structure_element_initialization_list ',' structure_element_initialization */
mario@181:     void *visit(structure_element_initialization_list_c *symbol);
mario@181:   /*  structure_element_name ASSIGN value */
mario@181:     void *visit(structure_element_initialization_c *symbol);
mario@181:   /*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */
mario@181:   /*
Laurent@706:   SYM_REF4(string_type_declaration_c, string_type_name,
mario@181:   					elementary_string_type_name,
mario@181:   					string_type_declaration_size,
mario@181:   					string_type_declaration_init) // may be == NULL!
mario@181:   */
mario@181:     void *visit(string_type_declaration_c *symbol);
ccb@202: 
msousa@810:   /* function_block_type_name ASSIGN structure_initialization */
msousa@808:   /* structure_initialization -> may be NULL ! */
msousa@810:     void *visit(fb_spec_init_c *symbol);
msousa@808:     
ccb@202:   /*****************************/
ccb@202:   /* B 1.5.2 - Function Blocks */
ccb@202:   /*****************************/
ccb@202:   /*  FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */
ccb@202:   // SYM_REF3(function_block_declaration_c, fblock_name, var_declarations, fblock_body)
ccb@202:     void *visit(function_block_declaration_c *symbol);
ccb@202: 
msousa@619:   /*********************************************/
msousa@619:   /* B.1.6  Sequential function chart elements */
msousa@619:   /*********************************************/
msousa@619:   /* INITIAL_STEP step_name ':' action_association_list END_STEP */
msousa@619:   // SYM_REF2(initial_step_c, step_name, action_association_list)
msousa@619:     void *visit(initial_step_c *symbol);
msousa@619: 
msousa@619:   /* STEP step_name ':' action_association_list END_STEP */
msousa@619:   // SYM_REF2(step_c, step_name, action_association_list)
msousa@619:     void *visit(step_c *symbol);
msousa@619: 
msousa@619: 
mario@181: }; // search_base_type_c
mario@181: 
mario@181: 
mario@181: 
mario@181: