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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 variable.
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* The variable may be a simple variable, a function block instance, a
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* struture element within a data structured type (a struct or a fb), or
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* an array element.
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* A mixture of array element of a structure element of a structure element
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* of a .... is also suported!
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*
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* A reference to the relevant base type __definition__ is returned.
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* This means that if we find that the variable is of type MY_INT,
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* which was previously declared to be
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* TYPE MY_INT: INT := 9;
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* this class wil return INT, and __not__ MY_INT !!
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*
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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 ALLOWED!
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*
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* This class must be passed the scope within which the
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* variable was declared, and the variable name...
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*/
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class search_varfb_instance_type_c: public search_base_type_c {
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private:
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search_var_instance_decl_c search_var_instance_decl;
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decompose_var_instance_name_c *decompose_var_instance_name;
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symbol_c *current_structelement_name;
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bool search_base_type;
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public:
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search_varfb_instance_type_c(symbol_c *search_scope);
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symbol_c *get_type(symbol_c *variable_name, bool base_type = true);
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unsigned int get_vartype(symbol_c *variable_name);
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private:
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/* a helper function... */
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void *visit_list(list_c *list);
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/* a helper function... */
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void *base_type(symbol_c *symbol);
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private:
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/* We override the base class' visitor to identifier_c.
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* This is so because the base class does not consider a function block
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* to be a type, unlike this class that allows a variable instance
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* of a function block type...
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*/
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void *visit(identifier_c *type_name);
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/********************************/
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/* B 1.3.3 - Derived data types */
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/********************************/
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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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/* structure_type_name ':' structure_specification */
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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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// SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization)
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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); /* should never get called... */
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/* structure_element_name ASSIGN value */
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void *visit(structure_element_initialization_c *symbol); /* should never get called... */
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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 1.5.2 - 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_REF4(function_block_declaration_c, fblock_name, var_declarations, fblock_body, unused)
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void *visit(function_block_declaration_c *symbol);
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}; // search_varfb_instance_type_c
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