absyntax_utils/array_dimension_iterator.hh
author Conti Manuele <conti.ma@alice.it>
Wed, 18 Apr 2012 14:19:40 +0200
changeset 524 52b18b3c7490
parent 377 60b012b7793f
child 562 044238931066
permissions -rwxr-xr-x
Implement check_assignment_to_expression in lvalue_check_c class.
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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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/*
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 * Array dimension iterator.
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 * Iterate through the dimensions of array specification.
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 *
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 * This is part of the 4th stage that generates
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 * a c++ source program equivalent to the IL and ST
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 * code.
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 */
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/* Given a array_specification_c, iterate through
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 * each subrange, returning the symbol of each subrange
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 * ...array_dimension_iterator_c
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 */
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#include "../absyntax/visitor.hh"
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class array_dimension_iterator_c : public null_visitor_c {
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  private:
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    /* a pointer to the array_specification_c currently being analyzed */
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    symbol_c *array_specification;
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    /* used when called to iterate() for a parameter */
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    symbol_c *current_array_dimension;
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  private:
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    void* iterate_list(list_c *list);
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  public:
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    /* start off at the first dimension once again... */
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    void reset(void);
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    /* initialize the iterator object.
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     * We must be given a reference to a case_list_c that will be analyzed...
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     */
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    array_dimension_iterator_c(symbol_c *symbol);
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    /* Skip to the next subrange. After object creation,
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     * the object references on subrange _before_ the first, so
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     * this function must be called once to get the object to
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     * reference the first subrange...
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     *
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     * Returns the subrange symbol!
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     */
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    symbol_c *next(void);
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    private:
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    /********************************/
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    /* B 1.3.3 - Derived data types */
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    /********************************/
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    /*  signed_integer DOTDOT signed_integer */
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    void *visit(subrange_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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    /* array_subrange_list ',' subrange */
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    void *visit(array_subrange_list_c *symbol);
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}; // function_param_iterator_c
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