absyntax_utils/search_var_instance_decl.cc
author laurent
Thu, 22 Apr 2010 00:29:30 +0200
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parent 226 29f8ffc203c1
child 265 4d222f46f8cc
permissions -rwxr-xr-x
Bug when parsing standard function block call in IL
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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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/* Determine the data type of a specific variable instance, including
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 * function block instances.
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 * A reference to the relevant variable declaration is returned.
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 * The variable instance may NOT be a member of a structure of a member
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 * of a structure of an element of an array of ...
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 *
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 * example:
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 *    window.points[1].coordinate.x
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 *    window.points[1].colour
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 *    etc... 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' !!
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 *
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 *
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 * If you need to pass a complete name of a variable instance (such as
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 * 'window.points[1].coordinate.x') use the search_varfb_instance_type_c instead!
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 */
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/* Note that 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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#include "absyntax_utils.hh"
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search_var_instance_decl_c::search_var_instance_decl_c(symbol_c *search_scope) {
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  this->current_vartype = none_vt;
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  this->search_scope = search_scope;
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  this->search_name = NULL;
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  this->current_type_decl = NULL;
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}
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symbol_c *search_var_instance_decl_c::get_decl(symbol_c *variable_instance_name) {
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  this->current_vartype = none_vt;
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  this->search_name = variable_instance_name;
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  return (symbol_c *)search_scope->accept(*this);
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}
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unsigned int search_var_instance_decl_c::get_vartype(void) {
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  return current_vartype;
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}
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/***************************/
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/* B 0 - Programming Model */
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/***************************/
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void *search_var_instance_decl_c::visit(library_c *symbol) {
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  /* we do not want to search multiple declaration scopes,
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   * so we do not visit all the functions, function blocks, etc...
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   */
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  return NULL;
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}
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/******************************************/
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/* B 1.4.3 - Declaration & Initialization */
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/******************************************/
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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 *search_var_instance_decl_c::visit(input_declarations_c *symbol) {
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  current_vartype = input_vt;
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  void *res = symbol->input_declaration_list->accept(*this);
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  if (res == NULL) {
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    current_vartype = none_vt;
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  }
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  return res;
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}
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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 *search_var_instance_decl_c::visit(output_declarations_c *symbol) {
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  current_vartype = output_vt;
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  void *res = symbol->var_init_decl_list->accept(*this);
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  if (res == NULL) {
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    current_vartype = none_vt;
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  }
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  return res;
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}
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/*  VAR_IN_OUT var_declaration_list END_VAR */
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void *search_var_instance_decl_c::visit(input_output_declarations_c *symbol) {
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  current_vartype = inoutput_vt;
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  void *res = symbol->var_declaration_list->accept(*this);
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  if (res == NULL) {
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    current_vartype = none_vt;
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  }
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  return res;
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}
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/* ENO : BOOL */
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void *search_var_instance_decl_c::visit(eno_param_declaration_c *symbol) {
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  if (compare_identifiers(symbol->name, search_name) == 0)
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    return symbol->type;
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  return NULL;
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}
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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 *search_var_instance_decl_c::visit(var_declarations_c *symbol) {
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  current_vartype = private_vt;
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  void *res = symbol->var_init_decl_list->accept(*this);
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  if (res == NULL) {
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    current_vartype = none_vt;
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  }
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  return res;
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}
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/*  VAR RETAIN var_init_decl_list END_VAR */
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void *search_var_instance_decl_c::visit(retentive_var_declarations_c *symbol) {
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  current_vartype = private_vt;
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  void *res = symbol->var_init_decl_list->accept(*this);
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  if (res == NULL) {
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    current_vartype = none_vt;
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  }
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  return res;
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}
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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 *search_var_instance_decl_c::visit(located_var_declarations_c *symbol) {
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  current_vartype = located_vt;
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  void *res = symbol->located_var_decl_list->accept(*this);
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  if (res == NULL) {
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    current_vartype = none_vt;
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  }
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  return res;
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}
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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 *search_var_instance_decl_c::visit(external_var_declarations_c *symbol) {
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  current_vartype = external_vt;
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  void *res = symbol->external_declaration_list->accept(*this);
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  if (res == NULL) {
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    current_vartype = none_vt;
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  }
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  return res;
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}
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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 *search_var_instance_decl_c::visit(global_var_declarations_c *symbol) {
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  current_vartype = global_vt;
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  void *res = symbol->global_var_decl_list->accept(*this);
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  if (res == NULL) {
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    current_vartype = none_vt;
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  }
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  return res;
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}
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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 *search_var_instance_decl_c::visit(var1_init_decl_c *symbol) {
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  current_type_decl = symbol->spec_init;
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  return symbol->var1_list->accept(*this);
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}
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/* var1_list ',' variable_name */
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// SYM_LIST(var1_list_c)
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void *search_var_instance_decl_c::visit(var1_list_c *symbol) {
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  list_c *list = symbol;
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  for(int i = 0; i < list->n; i++) {
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    if (compare_identifiers(list->elements[i], search_name) == 0)
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   /* by now, current_type_decl should be != NULL */
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      return current_type_decl;
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  }
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  return NULL;
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}
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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 *search_var_instance_decl_c::visit(fb_name_decl_c *symbol) {
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  current_type_decl = symbol->function_block_type_name;
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  return symbol->fb_name_list->accept(*this);
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}
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/* name_list ',' fb_name */
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void *search_var_instance_decl_c::visit(fb_name_list_c *symbol) {
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  list_c *list = symbol;
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  for(int i = 0; i < list->n; i++) {
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    if (compare_identifiers(list->elements[i], search_name) == 0)
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  /* by now, current_fb_declaration should be != NULL */
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      return current_type_decl;
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  }
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  return NULL;
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}
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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 *search_var_instance_decl_c::visit(array_var_init_decl_c *symbol) {
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  current_type_decl = symbol->array_spec_init;
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  return symbol->var1_list->accept(*this);
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}
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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 *search_var_instance_decl_c::visit(structured_var_init_decl_c *symbol) {
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  current_type_decl = symbol->initialized_structure;
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  return symbol->var1_list->accept(*this);
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}
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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 *search_var_instance_decl_c::visit(array_var_declaration_c *symbol) {
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  current_type_decl = symbol->array_specification;
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  return symbol->var1_list->accept(*this);
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}
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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 *search_var_instance_decl_c::visit(structured_var_declaration_c *symbol) {
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  current_type_decl = symbol->structure_type_name;
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  return symbol->var1_list->accept(*this);
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}
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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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/*  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 *search_var_instance_decl_c::visit(external_declaration_c *symbol) {
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  if (compare_identifiers(symbol->global_var_name, search_name) == 0)
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      return symbol->specification;
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  return NULL;
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}
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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 *search_var_instance_decl_c::visit(global_var_decl_c *symbol) {
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  if (symbol->type_specification != NULL) {
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    current_type_decl = symbol->type_specification;
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    return symbol->global_var_spec->accept(*this);
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  }
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  else
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    return NULL;
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}
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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 *search_var_instance_decl_c::visit(global_var_spec_c *symbol) {
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  if (symbol->global_var_name != NULL && compare_identifiers(symbol->global_var_name, search_name) == 0)
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      return current_type_decl;
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  else
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    return symbol->location->accept(*this);
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}
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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 *search_var_instance_decl_c::visit(global_var_list_c *symbol) {
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  list_c *list = symbol;
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  for(int i = 0; i < list->n; i++) {
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    if (compare_identifiers(list->elements[i], search_name) == 0)
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      /* by now, current_type_decl should be != NULL */
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      return current_type_decl;
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  }
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  return NULL;
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}
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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 *search_var_instance_decl_c::visit(located_var_decl_c *symbol) {
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  if (symbol->variable_name != NULL && compare_identifiers(symbol->variable_name, search_name) == 0)
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   312
    return symbol->located_var_spec_init;
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   313
  else {
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   314
    current_type_decl = symbol->located_var_spec_init;
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   315
    return symbol->location->accept(*this);
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   316
  }
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   317
}
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   318
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   319
/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
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   320
/* type_specification ->may be NULL ! */
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   321
// SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
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   322
// TODO!!
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   323
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   324
/*  AT direct_variable */
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   325
// SYM_REF2(location_c, direct_variable, unused)
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   326
void *search_var_instance_decl_c::visit(location_c *symbol) {
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   327
  if (compare_identifiers(symbol->direct_variable, search_name) == 0)
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   328
    return current_type_decl;
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   329
  else
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    return NULL;
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   331
}
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   332
        
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   333
/*| global_var_list ',' global_var_name */
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   334
// SYM_LIST(global_var_list_c)
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   335
// TODO!!
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   336
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   337
/*  var1_list ':' single_byte_string_spec */
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   338
// SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec)
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   339
void *search_var_instance_decl_c::visit(single_byte_string_var_declaration_c *symbol) {
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   340
  current_type_decl = symbol->single_byte_string_spec;
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   341
  return symbol->var1_list->accept(*this);
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   342
}
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   343
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   344
/*  STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */
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   345
/* integer ->may be NULL ! */
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   346
/* single_byte_character_string ->may be NULL ! */
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   347
// SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string)
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   348
// TODO!!
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   349
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   350
/*  var1_list ':' double_byte_string_spec */
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   351
// SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec)
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   352
void *search_var_instance_decl_c::visit(double_byte_string_var_declaration_c *symbol) {
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   353
  current_type_decl = symbol->double_byte_string_spec;
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   354
  return symbol->var1_list->accept(*this);
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   355
}
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   356
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   357
/*  WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */
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   358
/* integer ->may be NULL ! */
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   359
/* double_byte_character_string ->may be NULL ! */
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   360
// SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string)
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   361
// TODO!!
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   362
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   363
/*  variable_name incompl_location ':' var_spec */
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   364
// SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused)
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   365
// TODO!!
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diff changeset
   366
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   367
/*  AT incompl_location_token */
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   368
// SYM_TOKEN(incompl_location_c)
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   369
// TODO!!
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diff changeset
   370
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diff changeset
   371
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   372
/**************************************/
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   373
/* B.1.5 - Program organization units */
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   374
/**************************************/
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   375
/***********************/
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diff changeset
   376
/* B 1.5.1 - Functions */
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   377
/***********************/
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   378
// SYM_REF4(function_declaration_c, derived_function_name, type_name, var_declarations_list, function_body)
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   379
void *search_var_instance_decl_c::visit(function_declaration_c *symbol) {
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   380
  /* functions have a variable named after themselves, to store
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   381
   * the variable that will be returned!!
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diff changeset
   382
   */
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diff changeset
   383
  if (compare_identifiers(symbol->derived_function_name, search_name) == 0)
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   384
      return symbol->type_name;
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diff changeset
   385
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diff changeset
   386
  /* no need to search through all the body, so we only
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diff changeset
   387
   * visit the variable declarations...!
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diff changeset
   388
   */
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   389
  return symbol->var_declarations_list->accept(*this);
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diff changeset
   390
}
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diff changeset
   391
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diff changeset
   392
/*****************************/
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diff changeset
   393
/* B 1.5.2 - Function Blocks */
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   394
/*****************************/
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   395
void *search_var_instance_decl_c::visit(function_block_declaration_c *symbol) {
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diff changeset
   396
  /* no need to search through all the body, so we only
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diff changeset
   397
   * visit the variable declarations...!
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diff changeset
   398
   */
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diff changeset
   399
  return symbol->var_declarations->accept(*this);
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diff changeset
   400
}
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diff changeset
   401
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diff changeset
   402
/**********************/
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diff changeset
   403
/* B 1.5.3 - Programs */
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diff changeset
   404
/**********************/
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diff changeset
   405
void *search_var_instance_decl_c::visit(program_declaration_c *symbol) {
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diff changeset
   406
  /* no need to search through all the body, so we only
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parents:
diff changeset
   407
   * visit the variable declarations...!
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parents:
diff changeset
   408
   */
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diff changeset
   409
  return symbol->var_declarations->accept(*this);
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diff changeset
   410
}
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parents:
diff changeset
   411
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diff changeset
   412
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diff changeset
   413
/********************************/
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diff changeset
   414
/* B 1.7 Configuration elements */
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diff changeset
   415
/********************************/
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diff changeset
   416
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diff changeset
   417
/*
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diff changeset
   418
CONFIGURATION configuration_name
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diff changeset
   419
   optional_global_var_declarations
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   420
   (resource_declaration_list | single_resource_declaration)
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diff changeset
   421
   optional_access_declarations
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diff changeset
   422
   optional_instance_specific_initializations
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diff changeset
   423
END_CONFIGURATION
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diff changeset
   424
*/
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diff changeset
   425
/*
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diff changeset
   426
SYM_REF6(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, unused)
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diff changeset
   427
*/
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diff changeset
   428
void *search_var_instance_decl_c::visit(configuration_declaration_c *symbol) {
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diff changeset
   429
  /* no need to search through all the configuration, so we only
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   430
   * visit the global variable declarations...!
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parents:
diff changeset
   431
   */
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diff changeset
   432
  if (symbol->global_var_declarations != NULL)
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diff changeset
   433
    return symbol->global_var_declarations->accept(*this);
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diff changeset
   434
  else
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diff changeset
   435
    return NULL;
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parents:
diff changeset
   436
}
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   437
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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diff changeset
   438
/*
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diff changeset
   439
RESOURCE resource_name ON resource_type_name
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diff changeset
   440
   optional_global_var_declarations
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diff changeset
   441
   single_resource_declaration
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diff changeset
   442
END_RESOURCE
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diff changeset
   443
*/
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diff changeset
   444
// SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration)
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diff changeset
   445
void *search_var_instance_decl_c::visit(resource_declaration_c *symbol) {
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diff changeset
   446
  /* no need to search through all the resource, so we only
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   447
   * visit the global variable declarations...!
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   448
   */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   449
  if (symbol->global_var_declarations != NULL)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   450
    return symbol->global_var_declarations->accept(*this);
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parents:
diff changeset
   451
  else
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   452
    return NULL;
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   453
}
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   454
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   455
/* task_configuration_list program_configuration_list */
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parents:
diff changeset
   456
// SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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diff changeset
   457
void *search_var_instance_decl_c::visit(single_resource_declaration_c *symbol) {
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diff changeset
   458
  /* no need to search through all the resource,
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   459
   * and there is no global variable declarations...!
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   460
   */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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diff changeset
   461
  return NULL;
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   462
}
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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diff changeset
   463
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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diff changeset
   464
#if 0
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diff changeset
   465
/*********************/
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diff changeset
   466
/* B 1.4 - Variables */
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parents:
diff changeset
   467
/*********************/
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parents:
diff changeset
   468
SYM_REF2(symbolic_variable_c, var_name, unused)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   469
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   470
/********************************************/
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   471
/* B.1.4.1   Directly Represented Variables */
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parents:
diff changeset
   472
/********************************************/
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   473
SYM_TOKEN(direct_variable_c)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   474
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   475
/*************************************/
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parents:
diff changeset
   476
/* B.1.4.2   Multi-element Variables */
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parents:
diff changeset
   477
/*************************************/
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   478
/*  subscripted_variable '[' subscript_list ']' */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   479
SYM_REF2(array_variable_c, subscripted_variable, subscript_list)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   480
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   481
/* subscript_list ',' subscript */
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parents:
diff changeset
   482
SYM_LIST(subscript_list_c)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   483
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   484
/*  record_variable '.' field_selector */
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parents:
diff changeset
   485
/*  WARNING: input and/or output variables of function blocks
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parents:
diff changeset
   486
 *           may be accessed as fields of a tructured variable!
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parents:
diff changeset
   487
 *           Code handling a structured_variable_c must take
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   488
 *           this into account!
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   489
 */
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parents:
diff changeset
   490
SYM_REF2(structured_variable_c, record_variable, field_selector)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   491
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   492
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   493
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   494
};
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parents:
diff changeset
   495
#endif