author | lbessard |
Wed, 31 Jan 2007 19:23:46 +0100 | |
changeset 3 | 38850ee685e6 |
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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/* |
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* Seperation of type specification and default value constructs |
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* (for e.g. simple_spec_init_c), into a type specificiation part, |
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* and a default value part. |
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*/ |
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//#include <stdio.h> /* required for NULL */ |
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//#include <string> |
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//#include <iostream> |
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//#include "../../util/symtable.hh" |
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class spec_init_sperator_c: public null_visitor_c { |
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private: |
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/* this is a singleton class... */ |
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static spec_init_sperator_c *class_instance; |
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static spec_init_sperator_c *get_class_instance(void) { |
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if (NULL == class_instance) |
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class_instance = new spec_init_sperator_c(); |
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if (NULL == class_instance) |
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ERROR; |
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return class_instance; |
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} |
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private: |
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typedef enum {search_spec, search_init} search_what_t; |
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static search_what_t search_what; |
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public: |
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/* the only two public functions... */ |
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static symbol_c *get_spec(symbol_c *spec_init) { |
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search_what = search_spec; |
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return (symbol_c *)spec_init->accept(*get_class_instance()); |
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} |
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static symbol_c *get_init(symbol_c *spec_init) { |
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search_what = search_init; |
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return (symbol_c *)spec_init->accept(*get_class_instance()); |
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} |
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// private: |
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public: /* probably needs to be public so it may be visited... !! */ |
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/*******************************************/ |
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/* B 1.1 - Letters, digits and identifiers */ |
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/*******************************************/ |
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// SYM_TOKEN(identifier_c) |
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void *visit(identifier_c *symbol) { |
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TRACE("spec_init_sperator_c::identifier_c"); |
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switch (search_what) { |
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/* if we ever get called sith a simple identifier_c, then it must be a previously declared type... */ |
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case search_spec: return symbol; |
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case search_init: return NULL; |
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} |
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ERROR; /* should never occur */ |
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return NULL; |
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} |
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/********************************/ |
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/* B 1.3.3 - Derived data types */ |
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/********************************/ |
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/* simple_specification ASSIGN constant */ |
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void *visit(simple_spec_init_c *symbol) { |
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TRACE("spec_init_sperator_c::simple_spec_init_c"); |
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switch (search_what) { |
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case search_spec: return symbol->simple_specification; |
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case search_init: return symbol->constant; |
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} |
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ERROR; /* should never occur */ |
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return NULL; |
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} |
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/* subrange_specification ASSIGN signed_integer */ |
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void *visit(subrange_spec_init_c *symbol) { |
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TRACE("spec_init_sperator_c::subrange_spec_init_c"); |
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switch (search_what) { |
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case search_spec: return symbol->subrange_specification; |
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case search_init: return symbol->signed_integer; |
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} |
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ERROR; /* should never occur */ |
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return NULL; |
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} |
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|
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/* enumerated_specification ASSIGN enumerated_value */ |
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void *visit(enumerated_spec_init_c *symbol) { |
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TRACE("spec_init_sperator_c::enumerated_spec_init_c"); |
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switch (search_what) { |
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case search_spec: return symbol->enumerated_specification; |
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case search_init: return symbol->enumerated_value; |
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} |
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ERROR; /* should never occur */ |
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return NULL; |
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} |
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|
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/* structure_type_name ASSIGN structure_initialization */ |
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/* structure_initialization may be NULL ! */ |
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//SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization) |
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void *visit(initialized_structure_c *symbol) { |
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TRACE("spec_init_sperator_c::initialized_structure_c"); |
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switch (search_what) { |
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case search_spec: return symbol->structure_type_name; |
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case search_init: return symbol->structure_initialization; |
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} |
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ERROR; /* should never occur */ |
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return NULL; |
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} |
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146 |
|
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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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/* fb_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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TRACE("spec_init_sperator_c::fb_name_decl_c"); |
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switch (search_what) { |
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case search_spec: return symbol->function_block_type_name; |
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case search_init: return symbol->structure_initialization; |
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} |
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ERROR; /* should never occur */ |
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return NULL; |
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} |
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|
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}; /* class spec_init_sperator_c */ |
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|
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166 |
|
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|
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spec_init_sperator_c *spec_init_sperator_c ::class_instance = NULL; |
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spec_init_sperator_c::search_what_t spec_init_sperator_c::search_what; |