absyntax_utils/function_call_iterator.hh
author Catarina Boucinha <ccb@fe.up.pt>
Thu, 27 Aug 2009 16:18:56 +0100
changeset 203 b8a2f4c86745
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child 265 4d222f46f8cc
permissions -rw-r--r--
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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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/*
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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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    identifier_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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