absyntax_utils/function_call_iterator.hh
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Tue, 28 Jun 2016 13:34:29 +0000
branchfix_compilation_warnings
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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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 * Function call parameter iterator.
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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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#include "../absyntax/visitor.hh"
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/* given a function_body_c, iterate through each
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 * function/FB call in that code.
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 */
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class function_call_iterator_c : public iterator_visitor_c {
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  private:
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    symbol_c *start_symbol;
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    int next_fcall, fcall_count;
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    symbol_c *current_fcall_name;
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    symbol_c *current_finvocation;
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  public:
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    /* initialise the iterator object.
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     * We must be given a reference to the function declaration
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     * that will be analysed...
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     */
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    function_call_iterator_c(symbol_c *symbol);
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    /* Skip to the next function call. After object creation,
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     * the object references _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 function call...
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     *
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     * Returns the function_invocation_c!
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     */
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    symbol_c *next(void);
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    /* Returns the name of the currently referenced function invocation */
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    token_c *fname(void);
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  private:
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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 3.1 - Expressions */
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  /***********************/
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    void *visit(function_invocation_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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  /* | function_name [il_operand_list] */
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  // SYM_REF2(il_function_call_c, function_name, il_operand_list)
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    void *visit(il_function_call_c *symbol);
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  /* | function_name '(' eol_list [il_param_list] ')' */
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  // SYM_REF2(il_formal_funct_call_c, function_name, il_param_list)
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  void *visit(il_formal_funct_call_c *symbol);
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}; // class function_call_iterator_c 
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