author | lbessard |
Tue, 27 Feb 2007 17:24:10 +0100 | |
changeset 18 | e6af5eb5f546 |
parent 0 | fb772792efd1 |
child 25 | e6a841e365b7 |
permissions | -rwxr-xr-x |
0
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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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/* |
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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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/* 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 memeber |
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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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class search_var_instance_decl_c: public search_visitor_c { |
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|
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private: |
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symbol_c *search_scope; |
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symbol_c *search_name; |
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symbol_c *current_type_decl; |
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|
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public: |
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search_var_instance_decl_c(symbol_c *search_scope) { |
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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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|
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symbol_c *get_decl(symbol_c *variable_instance_name) { |
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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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|
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public: |
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/***************************/ |
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/* B 0 - Programming Model */ |
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/***************************/ |
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void *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, fucntion blocks, etc... |
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*/ |
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return NULL; |
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} |
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|
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|
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|
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/******************************************/ |
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/* B 1.4.3 - Declaration & Initialisation */ |
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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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|
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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 *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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|
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/* var1_list ',' variable_name */ |
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// SYM_LIST(var1_list_c) |
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void *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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|
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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 *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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123 |
|
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/* name_list ',' fb_name */ |
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void *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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134 |
|
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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 *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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141 |
|
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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 *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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148 |
|
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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 *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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155 |
|
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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 *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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162 |
|
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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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167 |
|
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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 *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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|
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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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// TODO!! |
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180 |
|
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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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// TODO!! |
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|
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/* AT direct_variable */ |
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// SYM_REF2(location_c, direct_variable, unused) |
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// TODO!! |
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188 |
|
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/*| global_var_list ',' global_var_name */ |
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// SYM_LIST(global_var_list_c) |
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// TODO!! |
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192 |
|
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/* var1_list ':' single_byte_string_spec */ |
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194 |
// SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec) |
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void *visit(single_byte_string_var_declaration_c *symbol) { |
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current_type_decl = symbol->single_byte_string_spec; |
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return symbol->var1_list->accept(*this); |
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} |
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199 |
|
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/* STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */ |
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201 |
/* integer ->may be NULL ! */ |
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202 |
/* single_byte_character_string ->may be NULL ! */ |
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203 |
// SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string) |
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// TODO!! |
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205 |
|
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/* var1_list ':' double_byte_string_spec */ |
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207 |
// SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec) |
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void *visit(double_byte_string_var_declaration_c *symbol) { |
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current_type_decl = symbol->double_byte_string_spec; |
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return symbol->var1_list->accept(*this); |
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} |
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|
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/* WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */ |
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214 |
/* integer ->may be NULL ! */ |
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215 |
/* double_byte_character_string ->may be NULL ! */ |
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// SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string) |
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// TODO!! |
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218 |
|
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/* variable_name incompl_location ':' var_spec */ |
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220 |
// SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused) |
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221 |
// TODO!! |
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222 |
|
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/* AT incompl_location_token */ |
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224 |
// SYM_TOKEN(incompl_location_c) |
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225 |
// TODO!! |
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226 |
|
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227 |
|
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228 |
/**************************************/ |
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229 |
/* B.1.5 - Program organization units */ |
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230 |
/**************************************/ |
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/***********************/ |
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/* B 1.5.1 - Functions */ |
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/***********************/ |
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// SYM_REF4(function_declaration_c, derived_function_name, type_name, var_declarations_list, function_body) |
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void *visit(function_declaration_c *symbol) { |
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/* functions have a variable named after themselves, to store |
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* the variable that will be returned!! |
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*/ |
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if (compare_identifiers(symbol->derived_function_name, search_name) == 0) |
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return symbol->type_name; |
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|
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/* no need to search through all the body, so we only |
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* visit the variable declarations...! |
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*/ |
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return symbol->var_declarations_list->accept(*this); |
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} |
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|
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/*****************************/ |
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/* B 1.5.2 - Function Blocks */ |
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/*****************************/ |
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void *visit(function_block_declaration_c *symbol) { |
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/* no need to search through all the body, so we only |
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* visit the variable declarations...! |
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*/ |
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return symbol->var_declarations->accept(*this); |
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} |
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|
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/**********************/ |
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/* B 1.5.3 - Programs */ |
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/**********************/ |
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void *visit(program_declaration_c *symbol) { |
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/* no need to search through all the body, so we only |
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* visit the variable declarations...! |
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*/ |
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return symbol->var_declarations->accept(*this); |
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} |
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|
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|
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#if 0 |
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/*********************/ |
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/* B 1.4 - Variables */ |
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/*********************/ |
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SYM_REF2(symbolic_variable_c, var_name, unused) |
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|
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/********************************************/ |
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/* B.1.4.1 Directly Represented Variables */ |
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/********************************************/ |
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SYM_TOKEN(direct_variable_c) |
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|
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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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|
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/* subscript_list ',' subscript */ |
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SYM_LIST(subscript_list_c) |
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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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|
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#endif |
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}; |
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