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/*
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* (c) 2003 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 data type of a specific variable instance, including
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* function block instances.
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* A reference to the relevant variable declaration is returned.
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* The variable instance may NOT be a member of a structure of a memeber
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* of a structure of an element of an array of ...
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*
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* example:
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* window.points[1].coordinate.x
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* window.points[1].colour
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* etc... ARE NOT ALLOWED!
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*
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* This class must only be passed the name of the variable that will appear
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* in the variable declaration. In the above examples, this would be
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* 'window' !!
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*
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*
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* If you need to pass a complete name of a variable instance (such as
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* 'window.points[1].coordinate.x') use the search_varfb_instance_type_c instead!
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*/
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/* Note that current_type_decl that this class returns may reference the
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* name of a type, or the type declaration itself!
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* For an example of the first, consider a variable declared as ...
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* x : AAA;
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* where the AAA type is previously declared as whatever.
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* For an example of the second, consider a variable declared as ...
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* x : array of int [10]; ----> is allowed
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*
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* If it is the first, we will return a reference to the name, if the second
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* we return a reference to the declaration!!
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*/
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class search_var_instance_decl_c: public search_visitor_c {
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private:
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symbol_c *search_scope;
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symbol_c *search_name;
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symbol_c *current_type_decl;
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/* variable used to store the type of variable currently being processed... */
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/* Will contain a single value of generate_c_vardecl_c::XXXX_vt */
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unsigned int current_vartype;
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public:
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search_var_instance_decl_c(symbol_c *search_scope);
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symbol_c *get_decl(symbol_c *variable_instance_name);
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unsigned int get_vartype();
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public:
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/* the types of variables that need to be processed... */
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static const unsigned int none_vt = 0x0000;
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static const unsigned int input_vt = 0x0001; // VAR_INPUT
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static const unsigned int output_vt = 0x0002; // VAR_OUTPUT
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static const unsigned int inoutput_vt = 0x0004; // VAR_IN_OUT
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static const unsigned int private_vt = 0x0008; // VAR
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static const unsigned int temp_vt = 0x0010; // VAR_TEMP
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static const unsigned int external_vt = 0x0020; // VAR_EXTERNAL
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static const unsigned int global_vt = 0x0040; // VAR_GLOBAL
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static const unsigned int located_vt = 0x0080; // VAR <var_name> AT <location>
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private:
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/***************************/
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/* B 0 - Programming Model */
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/***************************/
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void *visit(library_c *symbol);
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/******************************************/
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/* B 1.4.3 - Declaration & Initialisation */
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/******************************************/
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/* edge -> The F_EDGE or R_EDGE directive */
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// SYM_REF2(edge_declaration_c, edge, var1_list)
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// TODO
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void *visit(input_declarations_c *symbol);
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/* VAR_OUTPUT [RETAIN | NON_RETAIN] var_init_decl_list END_VAR */
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/* option -> may be NULL ! */
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void *visit(output_declarations_c *symbol);
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/* VAR_IN_OUT var_declaration_list END_VAR */
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void *visit(input_output_declarations_c *symbol);
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/* VAR [CONSTANT] var_init_decl_list END_VAR */
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/* option -> may be NULL ! */
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/* helper symbol for input_declarations */
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void *visit(var_declarations_c *symbol);
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/* VAR RETAIN var_init_decl_list END_VAR */
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void *visit(retentive_var_declarations_c *symbol);
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/* VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */
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/* option -> may be NULL ! */
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//SYM_REF2(located_var_declarations_c, option, located_var_decl_list)
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void *visit(located_var_declarations_c *symbol);
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/*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */
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/* option -> may be NULL ! */
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//SYM_REF2(external_var_declarations_c, option, external_declaration_list)
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void *visit(external_var_declarations_c *symbol);
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/*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */
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/* option -> may be NULL ! */
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//SYM_REF2(global_var_declarations_c, option, global_var_decl_list)
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void *visit(global_var_declarations_c *symbol);
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/* var1_list is one of the following...
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* simple_spec_init_c *
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* subrange_spec_init_c *
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* enumerated_spec_init_c *
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*/
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// SYM_REF2(var1_init_decl_c, var1_list, spec_init)
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void *visit(var1_init_decl_c *symbol);
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/* var1_list ',' variable_name */
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// SYM_LIST(var1_list_c)
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void *visit(var1_list_c *symbol);
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/* name_list ':' function_block_type_name ASSIGN structure_initialization */
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/* structure_initialization -> may be NULL ! */
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void *visit(fb_name_decl_c *symbol);
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/* name_list ',' fb_name */
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void *visit(fb_name_list_c *symbol);
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/* var1_list ':' array_spec_init */
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// SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init)
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void *visit(array_var_init_decl_c *symbol);
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/* var1_list ':' initialized_structure */
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// SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure)
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void *visit(structured_var_init_decl_c *symbol);
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/* var1_list ':' array_specification */
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// SYM_REF2(array_var_declaration_c, var1_list, array_specification)
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void *visit(array_var_declaration_c *symbol);
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/* var1_list ':' structure_type_name */
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// SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name)
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void *visit(structured_var_declaration_c *symbol);
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/* [variable_name] location ':' located_var_spec_init */
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/* variable_name -> may be NULL ! */
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// SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)
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// TODO!!
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/* global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */
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// SYM_REF2(external_declaration_c, global_var_name, specification)
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void *visit(external_declaration_c *symbol);
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/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
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/* type_specification ->may be NULL ! */
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// SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
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void *visit(global_var_decl_c *symbol);
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/*| global_var_name location */
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//SYM_REF2(global_var_spec_c, global_var_name, location)
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void *visit(global_var_spec_c *symbol);
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/*| global_var_list ',' global_var_name */
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//SYM_LIST(global_var_list_c)
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void *visit(global_var_list_c *symbol);
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/* [variable_name] location ':' located_var_spec_init */
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/* variable_name -> may be NULL ! */
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//SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)
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void *visit(located_var_decl_c *symbol);
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/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
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/* type_specification ->may be NULL ! */
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// SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
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// TODO!!
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/* AT direct_variable */
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// SYM_REF2(location_c, direct_variable, unused)
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void *visit(location_c *symbol);
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/*| global_var_list ',' global_var_name */
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// SYM_LIST(global_var_list_c)
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// TODO!!
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/* var1_list ':' single_byte_string_spec */
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// SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec)
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void *visit(single_byte_string_var_declaration_c *symbol);
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/* STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */
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/* integer ->may be NULL ! */
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/* single_byte_character_string ->may be NULL ! */
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// SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string)
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// TODO!!
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/* var1_list ':' double_byte_string_spec */
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// SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec)
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void *visit(double_byte_string_var_declaration_c *symbol);
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/* WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */
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/* integer ->may be NULL ! */
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/* double_byte_character_string ->may be NULL ! */
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// SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string)
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// TODO!!
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/* variable_name incompl_location ':' var_spec */
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// SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused)
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// TODO!!
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/* AT incompl_location_token */
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// SYM_TOKEN(incompl_location_c)
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// TODO!!
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/**************************************/
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/* B.1.5 - Program organization units */
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/**************************************/
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/***********************/
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/* B 1.5.1 - Functions */
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/***********************/
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// SYM_REF4(function_declaration_c, derived_function_name, type_name, var_declarations_list, function_body)
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void *visit(function_declaration_c *symbol);
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/*****************************/
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/* B 1.5.2 - Function Blocks */
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/*****************************/
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void *visit(function_block_declaration_c *symbol);
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/**********************/
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/* B 1.5.3 - Programs */
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/**********************/
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void *visit(program_declaration_c *symbol);
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/********************************/
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/* B 1.7 Configuration elements */
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/********************************/
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/*
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CONFIGURATION configuration_name
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optional_global_var_declarations
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(resource_declaration_list | single_resource_declaration)
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optional_access_declarations
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optional_instance_specific_initializations
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END_CONFIGURATION
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*/
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/*
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SYM_REF6(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, unused)
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*/
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void *visit(configuration_declaration_c *symbol);
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/*
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RESOURCE resource_name ON resource_type_name
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optional_global_var_declarations
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single_resource_declaration
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END_RESOURCE
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*/
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// SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration)
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void *visit(resource_declaration_c *symbol);
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/* task_configuration_list program_configuration_list */
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// SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)
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void *visit(single_resource_declaration_c *symbol);
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#if 0
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/*********************/
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/* B 1.4 - Variables */
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/*********************/
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SYM_REF2(symbolic_variable_c, var_name, unused)
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/********************************************/
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/* B.1.4.1 Directly Represented Variables */
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/********************************************/
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SYM_TOKEN(direct_variable_c)
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/*************************************/
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/* B.1.4.2 Multi-element Variables */
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/*************************************/
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/* subscripted_variable '[' subscript_list ']' */
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SYM_REF2(array_variable_c, subscripted_variable, subscript_list)
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/* subscript_list ',' subscript */
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SYM_LIST(subscript_list_c)
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/* record_variable '.' field_selector */
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/* WARNING: input and/or output variables of function blocks
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* may be accessed as fields of a tructured variable!
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* Code handling a structured_variable_c must take
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* this into account!
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*/
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SYM_REF2(structured_variable_c, record_variable, field_selector)
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#endif
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}; // search_var_instance_decl_c
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