absyntax_utils/decompose_var_instance_name.cc
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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/* Decomposes a variable instance name into its constituents,
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 * example:
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 *    window.points[1].coordinate.x
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 *
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 *  will succesfully return
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 *        - window
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 *        - points
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 *        - coordinate
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 *        - x
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 * on succesive calls to decompose_var_instance_name_c::next_part()
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 */
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#include "decompose_var_instance_name.hh"
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decompose_var_instance_name_c::decompose_var_instance_name_c(symbol_c *variable_instance_name) {
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  variable_name = variable_instance_name;
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  next_variable_name = NULL;
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  current_recursive_variable_name = NULL;
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  previously_returned_variable_name = NULL;
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  current_array_subscript_list = NULL;
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}
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/* Get the next element in the strcutured variable */
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symbol_c *decompose_var_instance_name_c::get_next() {
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  /* We must always start from the top!
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   * See note in the structured_variable_c visitor
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   * to understand why...
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   */
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  current_array_subscript_list = NULL;
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  symbol_c *res = (symbol_c *)variable_name->accept(*this);
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  next_variable_name = current_recursive_variable_name;
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  if (previously_returned_variable_name == res)
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    return NULL;
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  previously_returned_variable_name = res;
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  return res;
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}
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/* If the current element in the structured variable is an array, return its subscript_list, 
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 * otherwise return NULL
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 */
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list_c *decompose_var_instance_name_c::get_current_arraysubs_list(void) {return current_array_subscript_list;}
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/*************************/
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/* B.1 - Common elements */
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/*************************/
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/*******************************************/
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/* B 1.1 - Letters, digits and identifiers */
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/*******************************************/
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/* sometimes (e.g. FB calls) the name of the variable is stored directly in an identifier_c object */
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void *decompose_var_instance_name_c::visit(identifier_c *symbol) {return (void *)symbol;}
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/*********************/
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/* B 1.4 - Variables */
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/*********************/
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void *decompose_var_instance_name_c::visit(symbolic_variable_c *symbol) {return (void *)(symbol->var_name);}
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/********************************************/
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/* B.1.4.1   Directly Represented Variables */
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/********************************************/
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void *decompose_var_instance_name_c::visit(direct_variable_c *symbol) {return (void *)symbol;}
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/*************************************/
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/* B.1.4.2   Multi-element Variables */
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/*************************************/
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/*  subscripted_variable '[' subscript_list ']' */
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// SYM_REF2(array_variable_c, subscripted_variable, subscript_list)
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void *decompose_var_instance_name_c::visit(array_variable_c *symbol) {
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  if (NULL == symbol->subscript_list) ERROR; // array may not have an empty subscript list!
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  current_array_subscript_list = dynamic_cast<list_c *>(symbol->subscript_list);
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  if (NULL == current_array_subscript_list) ERROR; // if it does not point to a subscript_list_c, then the abstract syntax tree has been changed, and this code needs to be fixed accordingly!
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  /* NOTE: the subscripted_variable may itself be a structure or an array!, so we must recursevily visit! */
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  /* the next line will call either:
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   *   - visit(structured_variable_c *) or visit(array_variable_c *), if the array variable is itself an element of another array os structure
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   *   - visit(symbolic_variable_c *) if it is a simple array variable
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   */
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  return symbol->subscripted_variable->accept(*this);
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}
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/*  record_variable '.' field_selector */
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/*  WARNING: input and/or output variables of function blocks
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 *           may be accessed as fields of a tructured variable!
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 *           Code handling a structured_variable_c must take
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 *           this into account!
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 */
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//SYM_REF2(structured_variable_c, record_variable, field_selector)
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void *decompose_var_instance_name_c::visit(structured_variable_c *symbol) {
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  /* NOTE: The following code will not work, as structured_variable_c
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   *       are grouped on the left, and not on the right!
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   *
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   *       example: window.origin.x
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   *       will result in
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   *       s1 = structured_variable_c("window, "origin");
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   *       s2 = structured_variable_c(s1, "x");
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   *       AND NOT
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   *       s1 = structured_variable_c("origin", "x");
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   *       s2 = structured_variable_c("window", s1);
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   *
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   *       as the following code assumes!!
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   *
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  current_variable_name = symbol->field_selector;
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  return symbol->record_variable->accept(*this);
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   */
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  /* The correct code, is therefore more complex... */
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  if (next_variable_name == symbol) {
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    return (void *)symbol->field_selector->accept(*this);
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  }
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  current_array_subscript_list = NULL;
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  current_recursive_variable_name = symbol;
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  /* the next line will call either:
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   *   - visit(structured_variable_c *) or visit(array_variable_c *), if the record variable has more elements to visit
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   *   - visit(symbolic_variable_c *) if it is the last element in the record variable
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   */
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  return symbol->record_variable->accept(*this); 
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}
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/********************************/
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/* B 2.2 - Operators */
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/********************************/
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void *decompose_var_instance_name_c::visit(LD_operator_c *symbol) {return (void *)&LD_operator_name;}
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void *decompose_var_instance_name_c::visit(S_operator_c *symbol) {return (void *)&S_operator_name;}
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void *decompose_var_instance_name_c::visit(R_operator_c *symbol) {return (void *)&R_operator_name;}
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void *decompose_var_instance_name_c::visit(S1_operator_c *symbol) {return (void *)&S1_operator_name;}
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void *decompose_var_instance_name_c::visit(R1_operator_c *symbol) {return (void *)&R1_operator_name;}
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void *decompose_var_instance_name_c::visit(CLK_operator_c *symbol) {return (void *)&CLK_operator_name;}
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void *decompose_var_instance_name_c::visit(CU_operator_c *symbol) {return (void *)&CU_operator_name;}
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void *decompose_var_instance_name_c::visit(CD_operator_c *symbol) {return (void *)&CD_operator_name;}
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void *decompose_var_instance_name_c::visit(PV_operator_c *symbol) {return (void *)&PV_operator_name;}
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void *decompose_var_instance_name_c::visit(IN_operator_c *symbol) {return (void *)&IN_operator_name;}
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void *decompose_var_instance_name_c::visit(PT_operator_c *symbol) {return (void *)&PT_operator_name;}
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identifier_c     decompose_var_instance_name_c::LD_operator_name("LD");
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identifier_c     decompose_var_instance_name_c::S_operator_name("S");
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identifier_c     decompose_var_instance_name_c::R_operator_name("R");
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identifier_c     decompose_var_instance_name_c::S1_operator_name("S1");
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identifier_c     decompose_var_instance_name_c::R1_operator_name("R1");
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identifier_c     decompose_var_instance_name_c::CLK_operator_name("CLK");
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identifier_c     decompose_var_instance_name_c::CU_operator_name("CU");
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identifier_c     decompose_var_instance_name_c::CD_operator_name("CD");
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identifier_c     decompose_var_instance_name_c::PV_operator_name("PV");
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identifier_c     decompose_var_instance_name_c::IN_operator_name("IN");
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identifier_c     decompose_var_instance_name_c::PT_operator_name("PT");
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