mario@181: /*
msousa@265:  *  matiec - a compiler for the programming languages defined in IEC 61131-3
msousa@265:  *
msousa@265:  *  Copyright (C) 2003-2011  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: 
msousa@504: /* Search in a VAR* END_VAR declaration for the delcration of the specified variable instance. 
msousa@504:  * Will return:
msousa@504:  *     - the declaration itself (get_decl() )
msousa@504:  *     - the type of declaration in which the variable was declared (get_vartype() )
msousa@504:  *
mario@181:  * The variable instance may NOT be a member of a structure of a memeber
mario@181:  * of a structure of an element of an array of ...
mario@181:  *
msousa@504:  * For example, considering the following 'variables':
mario@181:  *    window.points[1].coordinate.x
mario@181:  *    window.points[1].colour
msousa@504:  *    offset[99]
msousa@504:  *
msousa@504:  *   passing a reference to 'points', 'points[1]', 'points[1].colour', 'colour'
msousa@504:  *    ARE NOT ALLOWED!
mario@181:  *
mario@181:  * This class must only be passed the name of the variable that will appear
mario@181:  * in the variable declaration. In the above examples, this would be
msousa@504:  *   'window.points[1].coordinate.x'
msousa@504:  *   'window.points[1].coordinate'
msousa@504:  *   'window.points[1]'
msousa@504:  *   'window'
msousa@504:  *   'window.points[1].colour'
msousa@504:  *   'offset'
msousa@504:  *   'offset[99]'
msousa@504:  *
msousa@504:  *
msousa@504:  */
msousa@504:  
msousa@504: /* Note: 
msousa@504:  * Determining the declaration type of a specific variable instance (including
msousa@504:  * function block instances) really means determining whether the variable was declared in a
msousa@504:  *  VAR_INPUT
msousa@504:  *  VAR_OUTPUT
msousa@504:  *  VAR_IN_OUT
msousa@504:  *  VAR
msousa@504:  *  VAR_TEMP
msousa@504:  *  VAR_EXTERNAL
msousa@504:  *  VAR_GLOBAL
msousa@504:  *  VAR <var_name> AT <location>   -> Located variable!
msousa@504:  * 
msousa@504:  */
msousa@504: 
msousa@504: /* Note:
msousa@504:  *  The current_type_decl that this class returns may reference the
mario@181:  * name of a type, or the type declaration itself!
mario@181:  * For an example of the first, consider a variable declared as ...
mario@181:  * x : AAA;
mario@181:  * where the AAA type is previously declared as whatever.
mario@181:  * For an example of the second, consider a variable declared as ...
mario@181:  * x : array of int [10];  ---->  is allowed
mario@181:  *
mario@181:  * If it is the first, we will return a reference to the name, if the second
mario@181:  * we return a reference to the declaration!!
mario@181:  */
mario@181: 
mario@181: 
mario@181: class search_var_instance_decl_c: public search_visitor_c {
mario@181: 
mario@181:   private:
mario@181:     symbol_c *search_scope;
mario@181:     symbol_c *search_name;
mario@181:     symbol_c *current_type_decl;
mario@181: 
mario@181:     /* variable used to store the type of variable currently being processed... */
mario@181:     /* Will contain a single value of generate_c_vardecl_c::XXXX_vt */
mario@181:     unsigned int current_vartype;
mario@181: 
mario@181:   public:
mario@181:     search_var_instance_decl_c(symbol_c *search_scope);
mario@181:     symbol_c *get_decl(symbol_c *variable_instance_name);
msousa@417:     
msousa@417:     unsigned int get_vartype(symbol_c *variable_instance_name);
mario@181: 
mario@181:   public:
mario@181: 
mario@181:     /* the types of variables that need to be processed... */
mario@181:     static const unsigned int none_vt     = 0x0000;
mario@181:     static const unsigned int input_vt    = 0x0001;  // VAR_INPUT
mario@181:     static const unsigned int output_vt   = 0x0002;  // VAR_OUTPUT
mario@181:     static const unsigned int inoutput_vt = 0x0004;  // VAR_IN_OUT
mario@181:     static const unsigned int private_vt  = 0x0008;  // VAR
mario@181:     static const unsigned int temp_vt     = 0x0010;  // VAR_TEMP
mario@181:     static const unsigned int external_vt = 0x0020;  // VAR_EXTERNAL
mario@181:     static const unsigned int global_vt   = 0x0040;  // VAR_GLOBAL
mario@181:     static const unsigned int located_vt  = 0x0080;  // VAR <var_name> AT <location>
mario@181: 
mario@181:   private:
mario@181:     /***************************/
mario@181:     /* B 0 - Programming Model */
mario@181:     /***************************/
mario@181:     void *visit(library_c *symbol);
mario@181: 
mario@181:     /******************************************/
mario@181:     /* B 1.4.3 - Declaration & Initialisation */
mario@181:     /******************************************/
laurent@217: 
mario@181:     /* edge -> The F_EDGE or R_EDGE directive */
mario@181:     // SYM_REF2(edge_declaration_c, edge, var1_list)
mario@181:     // TODO
mario@181:     void *visit(input_declarations_c *symbol);
mario@181:     /* VAR_OUTPUT [RETAIN | NON_RETAIN] var_init_decl_list END_VAR */
mario@181:     /* option -> may be NULL ! */
mario@181:     void *visit(output_declarations_c *symbol);
mario@181:     /*  VAR_IN_OUT var_declaration_list END_VAR */
mario@181:     void *visit(input_output_declarations_c *symbol);
ccb@202:     /* ENO : BOOL */
ccb@202:     void *visit(eno_param_declaration_c *symbol);
mario@181:     /* VAR [CONSTANT] var_init_decl_list END_VAR */
mario@181:     /* option -> may be NULL ! */
mario@181:     /* helper symbol for input_declarations */
mario@181:     void *visit(var_declarations_c *symbol);
mario@181:     /*  VAR RETAIN var_init_decl_list END_VAR */
mario@181:     void *visit(retentive_var_declarations_c *symbol);
mario@181:     /*  VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */
mario@181:     /* option -> may be NULL ! */
mario@181:     //SYM_REF2(located_var_declarations_c, option, located_var_decl_list)
mario@181:     void *visit(located_var_declarations_c *symbol);
mario@181:     /*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */
mario@181:     /* option -> may be NULL ! */
mario@181:     //SYM_REF2(external_var_declarations_c, option, external_declaration_list)
mario@181:     void *visit(external_var_declarations_c *symbol);
mario@181:     /*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */
mario@181:     /* option -> may be NULL ! */
mario@181:     //SYM_REF2(global_var_declarations_c, option, global_var_decl_list)
mario@181:     void *visit(global_var_declarations_c *symbol);
mario@181:     /* var1_list is one of the following...
mario@181:      *    simple_spec_init_c *
mario@181:      *    subrange_spec_init_c *
mario@181:      *    enumerated_spec_init_c *
mario@181:      */
mario@181:     // SYM_REF2(var1_init_decl_c, var1_list, spec_init)
mario@181:     void *visit(var1_init_decl_c *symbol);
mario@181:     /* var1_list ',' variable_name */
mario@181:     // SYM_LIST(var1_list_c)
mario@181:     void *visit(var1_list_c *symbol);
mario@181:     /* name_list ':' function_block_type_name ASSIGN structure_initialization */
mario@181:     /* structure_initialization -> may be NULL ! */
mario@181:     void *visit(fb_name_decl_c *symbol);
mario@181:     /* name_list ',' fb_name */
mario@181:     void *visit(fb_name_list_c *symbol);
mario@181:     /* var1_list ':' array_spec_init */
mario@181:     // SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init)
mario@181:     void *visit(array_var_init_decl_c *symbol);
mario@181:     /*  var1_list ':' initialized_structure */
mario@181:     // SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure)
mario@181:     void *visit(structured_var_init_decl_c *symbol);
mario@181:     /*  var1_list ':' array_specification */
mario@181:     // SYM_REF2(array_var_declaration_c, var1_list, array_specification)
mario@181:     void *visit(array_var_declaration_c *symbol);
mario@181:     /*  var1_list ':' structure_type_name */
mario@181:     // SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name)
mario@181:     void *visit(structured_var_declaration_c *symbol);
mario@181:     /*  [variable_name] location ':' located_var_spec_init */
mario@181:     /* variable_name -> may be NULL ! */
mario@181:     // SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)
mario@181:     // TODO!!
mario@181: 
mario@181:     /*  global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */
mario@181:     // SYM_REF2(external_declaration_c, global_var_name, specification)
mario@181:     void *visit(external_declaration_c *symbol);
mario@181:     /*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
mario@181:     /* type_specification ->may be NULL ! */
mario@181:     // SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
mario@181:     void *visit(global_var_decl_c *symbol);
mario@181:     /*| global_var_name location */
mario@181:     //SYM_REF2(global_var_spec_c, global_var_name, location)
mario@181:     void *visit(global_var_spec_c *symbol);
mario@181:     /*| global_var_list ',' global_var_name */
mario@181:     //SYM_LIST(global_var_list_c)
mario@181:     void *visit(global_var_list_c *symbol);
mario@181:     /*  [variable_name] location ':' located_var_spec_init */
mario@181:     /* variable_name -> may be NULL ! */
mario@181:     //SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)
mario@181:     void *visit(located_var_decl_c *symbol);
mario@181:     /*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
mario@181:     /* type_specification ->may be NULL ! */
mario@181:     // SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
mario@181:     // TODO!!
mario@181:     /*  AT direct_variable */
mario@181:     // SYM_REF2(location_c, direct_variable, unused)
mario@181:     void *visit(location_c *symbol);
mario@181:     /*| global_var_list ',' global_var_name */
mario@181:     // SYM_LIST(global_var_list_c)
mario@181:     // TODO!!
mario@181:     /*  var1_list ':' single_byte_string_spec */
mario@181:     // SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec)
mario@181:     void *visit(single_byte_string_var_declaration_c *symbol);
mario@181:     /*  STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */
mario@181:     /* integer ->may be NULL ! */
mario@181:     /* single_byte_character_string ->may be NULL ! */
mario@181:     // SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string)
mario@181:     // TODO!!
mario@181:     
mario@181:     /*  var1_list ':' double_byte_string_spec */
mario@181:     // SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec)
mario@181:     void *visit(double_byte_string_var_declaration_c *symbol);
mario@181:     /*  WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */
mario@181:     /* integer ->may be NULL ! */
mario@181:     /* double_byte_character_string ->may be NULL ! */
mario@181:     // SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string)
mario@181:     // TODO!!
mario@181:     
mario@181:     /*  variable_name incompl_location ':' var_spec */
mario@181:     // SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused)
mario@181:     // TODO!!
mario@181:     
mario@181:     /*  AT incompl_location_token */
mario@181:     // SYM_TOKEN(incompl_location_c)
mario@181:     // TODO!!
mario@181: 
mario@181: 
mario@181:     /**************************************/
mario@181:     /* B.1.5 - Program organization units */
mario@181:     /**************************************/
mario@181:     /***********************/
mario@181:     /* B 1.5.1 - Functions */
mario@181:     /***********************/
mario@181:     // SYM_REF4(function_declaration_c, derived_function_name, type_name, var_declarations_list, function_body)
mario@181:     void *visit(function_declaration_c *symbol);
mario@181: 
mario@181:     /*****************************/
mario@181:     /* B 1.5.2 - Function Blocks */
mario@181:     /*****************************/
mario@181:     void *visit(function_block_declaration_c *symbol);
mario@181: 
mario@181:     /**********************/
mario@181:     /* B 1.5.3 - Programs */
mario@181:     /**********************/
mario@181:     void *visit(program_declaration_c *symbol);
mario@181: 
mario@181:     /********************************/
mario@181:     /* B 1.7 Configuration elements */
mario@181:     /********************************/
mario@181:     
mario@181:     /*
mario@181:     CONFIGURATION configuration_name
mario@181:        optional_global_var_declarations
mario@181:        (resource_declaration_list | single_resource_declaration)
mario@181:        optional_access_declarations
mario@181:        optional_instance_specific_initializations
mario@181:     END_CONFIGURATION
mario@181:     */
mario@181:     /*
mario@181:     SYM_REF6(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, unused)
mario@181:     */                                                                                                            
mario@181:     void *visit(configuration_declaration_c *symbol);
mario@181:     /*
mario@181:     RESOURCE resource_name ON resource_type_name
mario@181:        optional_global_var_declarations
mario@181:        single_resource_declaration
mario@181:     END_RESOURCE
mario@181:     */
mario@181:     // SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration)
mario@181:     void *visit(resource_declaration_c *symbol);
mario@181: 
mario@181:     /* task_configuration_list program_configuration_list */
mario@181:     // SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)
mario@181:     void *visit(single_resource_declaration_c *symbol);
mario@181: 
mario@181: }; // search_var_instance_decl_c
mario@181: