absyntax_utils/search_var_instance_decl.hh
author mjsousa
Thu, 29 May 2014 12:06:22 +0100
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child 939 5074236fb3c4
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Add error message for invalid datatype of transition condition. Generalize datatype narrowing algorithm for transition conditions.
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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) 2003-2011  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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/* Search in a VAR* END_VAR declaration for the delcration of the specified variable instance. 
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 * Will return:
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 *     - the declaration itself (get_decl() )
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 *     - the type of declaration in which the variable was declared (get_vartype() )
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 *
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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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 * For example, considering the following 'variables':
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 *    window.points[1].coordinate.x
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 *    window.points[1].colour
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 *    offset[99]
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 *
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 *   passing a reference to 'points', 'points[1]', 'points[1].colour', 'colour'
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 *    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.points[1].coordinate.x'
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 *   'window.points[1].coordinate'
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 *   'window.points[1]'
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 *   'window'
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 *   'window.points[1].colour'
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 *   'offset'
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 *   'offset[99]'
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 *
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 *
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 */
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/* Note: 
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 * Determining the declaration type of a specific variable instance (including
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 * function block instances) really means determining whether the variable was declared in a
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 *  VAR_INPUT
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 *  VAR_OUTPUT
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 *  VAR_IN_OUT
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 *  VAR
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 *  VAR_TEMP
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 *  VAR_EXTERNAL
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 *  VAR_GLOBAL
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 *  VAR <var_name> AT <location>   -> Located variable!
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 * 
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 */
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/* Note:
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 *  The 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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  public:
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    search_var_instance_decl_c(symbol_c *search_scope);
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  public:
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    typedef enum {
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        input_vt   ,  // VAR_INPUT
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        output_vt  ,  // VAR_OUTPUT
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        inoutput_vt,  // VAR_IN_OUT
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        private_vt ,  // VAR
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        temp_vt    ,  // VAR_TEMP
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        external_vt,  // VAR_EXTERNAL
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        global_vt  ,  // VAR_GLOBAL
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        located_vt ,   // VAR <var_name> AT <location>
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        none_vt
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      } vt_t;
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    typedef enum {
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        constant_opt  ,
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        retain_opt    ,
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        non_retain_opt,
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        none_opt
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      } opt_t;
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#if 0        
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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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    static const unsigned int none_opt        = 0x0000;
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    static const unsigned int constant_opt    = 0x0001;
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    static const unsigned int retain_opt      = 0x0002;
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    static const unsigned int non_retain_opt  = 0x0003;
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#endif    
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    symbol_c *   get_decl   (symbol_c *variable_instance_name); 
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    vt_t         get_vartype(symbol_c *variable_instance_name);
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    opt_t        get_option (symbol_c *variable_instance_name);
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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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    vt_t  current_vartype;
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    opt_t current_option;
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181
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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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    /******************************************/
217
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laurent
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181
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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(constant_option_c *symbol);
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    void *visit(retain_option_c *symbol);
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    void *visit(non_retain_option_c *symbol);
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181
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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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    /* ENO : BOOL */
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    void *visit(eno_param_declaration_c *symbol);
181
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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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   222
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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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   258
    
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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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   263
    /* 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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   267
    
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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.1.6  Sequential function chart elements */
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    /*********************************************/
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    /* | sequential_function_chart sfc_network */
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    // SYM_LIST(sequential_function_chart_c)
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    /* search_var_instance_decl_c inherits from serach_visitor_c, so no need to implement the following method. */
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    // void *visit(sequential_function_chart_c *symbol);
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    /* initial_step {step | transition | action} */
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    // SYM_LIST(sfc_network_c)
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    /* search_var_instance_decl_c inherits from serach_visitor_c, so no need to implement the following method. */
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    // void *visit(sfc_network_c *symbol);
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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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    /********************************/
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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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    /****************************************/
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    /* B.2 - Language IL (Instruction List) */
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    /****************************************/
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    /***********************************/
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    /* B 2.1 Instructions and Operands */
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    /***********************************/
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    /*| instruction_list il_instruction */
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    // SYM_LIST(instruction_list_c)
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    void *visit(instruction_list_c *symbol);
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    /***************************************/
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    /* B.3 - Language ST (Structured Text) */
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    /***************************************/
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    /********************/
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    /* B 3.2 Statements */
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    /********************/
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    // SYM_LIST(statement_list_c)
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    void *visit(statement_list_c *symbol);
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}; // search_var_instance_decl_c
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