author | mario |
Thu, 01 Feb 2007 11:43:09 +0100 | |
changeset 8 | 89902a42698e |
parent 0 | fb772792efd1 |
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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/* Returns the function block type declaration |
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* of a specific function block instance. |
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*/ |
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/* Returns the type name of a specific function block |
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* instance. This class will search the variable |
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* declarations inside the scope given to it |
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* searching for the declaration of the function |
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* block instance. |
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* |
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* The class constructor must be given the search scope |
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* (function, function block or program within which |
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* the function block instance was declared). |
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* |
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* This class will search the tree from the root given to the |
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* constructor. Another option would be to build a symbol table, |
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* and search that instead. Building the symbol table would be done |
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* while visiting the variable declaration objects in the parse |
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* tree. Unfortuantely, generate_cc_c does not visit these |
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* objects, delegating it to another class. This means that |
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* we would need another specialised class just to build the |
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* symbol table. We might just as well have a specialised class |
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* that searches the tree itself for the relevant info. This |
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* class is exactly that...! |
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*/ |
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class search_fb_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_fb_type_name; |
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|
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public: |
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search_fb_instance_decl_c(symbol_c *search_scope) { |
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this->search_scope = search_scope; |
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this->current_fb_type_name = NULL; |
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} |
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symbol_c *get_type_name(symbol_c *fb_instance_name) { |
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this->search_name = fb_instance_name; |
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return (symbol_c *)search_scope->accept(*this); |
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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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/* B 1.4.3 - Declaration & Initialisation */ |
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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_fb_type_name = symbol->function_block_type_name; |
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return symbol->fb_name_list->accept(*this); |
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} |
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|
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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_fb_type_name; |
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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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/* B.1.5 - Program organization units */ |
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/**************************************/ |
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/***********************/ |
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/* B 1.5.1 - Functions */ |
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/***********************/ |
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void *visit(function_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_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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|
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|
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141 |