mario@181: /*
msousa@265:  *  matiec - a compiler for the programming languages defined in IEC 61131-3
mario@181:  *
msousa@265:  *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
Edouard@279:  *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
mario@181:  *
msousa@265:  *  This program is free software: you can redistribute it and/or modify
msousa@265:  *  it under the terms of the GNU General Public License as published by
msousa@265:  *  the Free Software Foundation, either version 3 of the License, or
msousa@265:  *  (at your option) any later version.
msousa@265:  *
msousa@265:  *  This program is distributed in the hope that it will be useful,
msousa@265:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
msousa@265:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
msousa@265:  *  GNU General Public License for more details.
msousa@265:  *
msousa@265:  *  You should have received a copy of the GNU General Public License
msousa@265:  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
msousa@265:  *
mario@181:  *
mario@181:  * This code is made available on the understanding that it will not be
mario@181:  * used in safety-critical situations without a full and competent review.
mario@181:  */
mario@181: 
mario@181: /*
msousa@265:  * An IEC 61131-3 compiler.
mario@181:  *
mario@181:  * Based on the
mario@181:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
mario@181:  *
mario@181:  */
mario@181: 
mario@181: /*
mario@181:  * Seperation of type specification and default value constructs
mario@181:  * (for e.g. simple_spec_init_c), into a type specificiation part,
mario@181:  * and a default value part.
mario@181:  */
mario@181: 
mario@181: #include "spec_init_separator.hh"
msousa@596: #include "../main.hh" // required for ERROR() and ERROR_MSG() macros.
msousa@596: 
mario@181: 
mario@181: //#define DEBUG
mario@181: #ifdef DEBUG
mario@181: #define TRACE(classname) printf("\n____%s____\n",classname);
mario@181: #else
mario@181: #define TRACE(classname)
mario@181: #endif
mario@181: 
mario@181: 
mario@181: 
mario@181: spec_init_sperator_c *spec_init_sperator_c::get_class_instance(void) {
mario@181:   if (NULL == class_instance)
mario@181:     class_instance = new spec_init_sperator_c();
mario@181: 
mario@181:   if (NULL == class_instance)
mario@181:     ERROR;
mario@181: 
mario@181:   return class_instance;
mario@181: }
mario@181: 
mario@181:  /* the only two public functions... */
mario@181: symbol_c *spec_init_sperator_c::get_spec(symbol_c *spec_init) {
mario@181:    search_what = search_spec;
mario@181:    return (symbol_c *)spec_init->accept(*get_class_instance());
mario@181: }
mario@181: 
mario@181: symbol_c *spec_init_sperator_c::get_init(symbol_c *spec_init) {
mario@181:    search_what = search_init;
mario@181:    return (symbol_c *)spec_init->accept(*get_class_instance());
mario@181: }
mario@181: 
mario@181: /*******************************************/
mario@181: /* B 1.1 - Letters, digits and identifiers */
mario@181: /*******************************************/
mario@181: // SYM_TOKEN(identifier_c)
mjsousa@958: /* visitor for identifier_c should no longer be necessary. All references to derived datatypes are now stored in then */
mjsousa@958: /* AST using either poutype_identifier_c or derived_datatype_identifier_c                                             */
mjsousa@958: void *spec_init_sperator_c::visit(                 identifier_c *symbol) { ERROR; return NULL;} /* should never occur */
mjsousa@958: 
mjsousa@958: void *spec_init_sperator_c::visit(         poutype_identifier_c *symbol) {
mjsousa@958:   TRACE("spec_init_sperator_c::poutype_identifier_c");
mjsousa@945:   switch (search_what) {
mjsousa@945:     /* if we ever get called sith a simple identifier_c, then it must be a previously declared type... */
mjsousa@945:     case search_spec: return symbol;
mjsousa@945:     case search_init: return NULL;
mjsousa@945:   }
mjsousa@945:   ERROR; /* should never occur */
mjsousa@945:   return NULL;
mjsousa@945:   }
mjsousa@945:   
mjsousa@945:   
mjsousa@945: void *spec_init_sperator_c::visit(derived_datatype_identifier_c *symbol) {
mjsousa@958:   TRACE("spec_init_sperator_c::derived_datatype_identifier_c");
mario@181:   switch (search_what) {
mario@181:     /* if we ever get called sith a simple identifier_c, then it must be a previously declared type... */
mario@181:     case search_spec: return symbol;
mario@181:     case search_init: return NULL;
mario@181:   }
mario@181:   ERROR; /* should never occur */
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: 
mario@181: /********************************/
mario@181: /* B 1.3.3 - Derived data types */
mario@181: /********************************/
mario@181: 
mario@181: /* simple_specification ASSIGN constant */
mario@181: void *spec_init_sperator_c::visit(simple_spec_init_c *symbol) {
mario@181:   TRACE("spec_init_sperator_c::simple_spec_init_c");
mario@181:   switch (search_what) {
mario@181:     case search_spec: return symbol->simple_specification;
mario@181:     case search_init: return symbol->constant;
mario@181:   }
mario@181:   ERROR; /* should never occur */
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: /* subrange_specification ASSIGN signed_integer */
mario@181: void *spec_init_sperator_c::visit(subrange_spec_init_c *symbol) {
mario@181:   TRACE("spec_init_sperator_c::subrange_spec_init_c");
mario@181:   switch (search_what) {
mario@181:     case search_spec: return symbol->subrange_specification->accept(*this);
mario@181:     case search_init: return symbol->signed_integer;
mario@181:   }
mario@181:   ERROR; /* should never occur */
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: /*  integer_type_name '(' subrange')' */
mario@181: void *spec_init_sperator_c::visit(subrange_specification_c *symbol) {
mario@181:   TRACE("spec_init_sperator_c::subrange_specification_c");
mario@181:   switch (search_what) {
mario@181:     case search_spec: return symbol->integer_type_name;
mario@181:     case search_init: return NULL; /* should never occur */
mario@181:   }
mario@181:   ERROR; /* should never occur */
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: /* array_specification [ASSIGN array_initialization} */
mario@181: /* array_initialization may be NULL ! */
mario@181: void *spec_init_sperator_c::visit(array_spec_init_c *symbol) {
mario@181:   TRACE("spec_init_sperator_c::array_spec_init_c");
mario@181:   switch (search_what) {
mario@181:     case search_spec: return symbol->array_specification;
mario@181:     case search_init: return symbol->array_initialization;
mario@181:   }
mario@181:   return NULL;
mario@181: }
mario@181: 
mjsousa@912: /* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
mjsousa@912: /* NOTE: this symbol may be used directly in implictly defined variables in VAR_TEMP!! 
mjsousa@912:  *       so we must consider it here too!
mjsousa@912:  */
mjsousa@912: void *spec_init_sperator_c::visit(array_specification_c *symbol) {
mjsousa@912:   TRACE("spec_init_sperator_c::array_spec_init_c");
mjsousa@912:   switch (search_what) {
mjsousa@912:     case search_spec: return symbol;
mjsousa@912:     case search_init: return NULL;
mjsousa@912:   }
mjsousa@912:   return NULL;
mjsousa@912: }
mjsousa@912: 
mario@181: /* enumerated_specification ASSIGN enumerated_value */
mario@181: void *spec_init_sperator_c::visit(enumerated_spec_init_c *symbol) {
mario@181:   TRACE("spec_init_sperator_c::enumerated_spec_init_c");
mario@181:   switch (search_what) {
mario@181:     case search_spec: return symbol->enumerated_specification;
mario@181:     case search_init: return symbol->enumerated_value;
mario@181:   }
mario@181:   ERROR; /* should never occur */
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: /* structure_type_name ASSIGN structure_initialization */
mario@181: /* structure_initialization may be NULL ! */
mario@181: //SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization)
mario@181: void *spec_init_sperator_c::visit(initialized_structure_c *symbol) {
mario@181:   TRACE("spec_init_sperator_c::initialized_structure_c");
mario@181:   switch (search_what) {
mario@181:     case search_spec: return symbol->structure_type_name;
mario@181:     case search_init: return symbol->structure_initialization;
mario@181:   }
mario@181:   ERROR; /* should never occur */
mario@181:   return NULL;
mario@181: }
mario@181: 
msousa@810: /*  function_block_type_name ASSIGN structure_initialization */
msousa@810: /* structure_initialization -> may be NULL ! */
msousa@810: //SYM_REF2(fb_spec_init_c, function_block_type_name, structure_initialization)
msousa@810: void *spec_init_sperator_c::visit(fb_spec_init_c *symbol) {
msousa@810:   TRACE("spec_init_sperator_c::fb_spec_init_c");
msousa@810:   switch (search_what) {
msousa@810:     case search_spec: return symbol->function_block_type_name;
msousa@810:     case search_init: return symbol->structure_initialization;
msousa@810:   }
msousa@810:   ERROR; /* should never occur */
msousa@810:   return NULL;
msousa@810: }
mario@181: 
mjsousa@909: 
mjsousa@909: /* ref_spec:  REF_TO (non_generic_type_name | function_block_type_name) */
mjsousa@909: // SYM_REF1(ref_spec_c, type_name)
mjsousa@909: void *spec_init_sperator_c::visit(ref_spec_c *symbol) {
mjsousa@909:   TRACE("spec_init_sperator_c::ref_spec_c");
mjsousa@909:   /* This visitor should never really be called, but there is no harm in including it... */
mjsousa@909:   switch (search_what) {
mjsousa@909:     case search_spec: return symbol;
mjsousa@909:     case search_init: return NULL; /* should never occur */
mjsousa@909:   }
mjsousa@909:   ERROR; /* should never occur */
mjsousa@909:   return NULL;
mjsousa@909: }
mjsousa@909: 
mjsousa@909: 
mjsousa@909: /* For the moment, we do not support initialising reference data types */
mjsousa@909: /* ref_spec_init: ref_spec [ ASSIGN ref_initialization ] */ 
mjsousa@909: /* NOTE: ref_initialization may be NULL!! */
mjsousa@909: // SYM_REF2(ref_spec_init_c, ref_spec, ref_initialization)
mjsousa@909: void *spec_init_sperator_c::visit(ref_spec_init_c *symbol) {
mjsousa@909:   TRACE("spec_init_sperator_c::ref_spec_init_c");
mjsousa@909:   switch (search_what) {
mjsousa@909:     case search_spec: return symbol->ref_spec;
mjsousa@909:     case search_init: return symbol->ref_initialization;
mjsousa@909:   }
mjsousa@909:   ERROR; /* should never occur */
mjsousa@909:   return NULL;
mjsousa@958: 
mjsousa@909: }
mjsousa@909: 
mjsousa@909: 
mjsousa@909: 
mario@181: /******************************************/
mario@181: /* B 1.4.3 - Declaration & Initialisation */
mario@181: /******************************************/
mario@181: 
msousa@350: /* STRING '[' integer ']' 
msousa@350:  * STRING ASSIGN single_byte_character_string
msousa@350:  * STRING '[' integer ']' ASSIGN single_byte_character_string
msousa@350:  */
msousa@350: void *spec_init_sperator_c::visit(single_byte_string_spec_c *symbol) {
msousa@350:   TRACE("spec_init_sperator_c::single_byte_string_spec_c");
msousa@350:   switch (search_what) {
msousa@350:     case search_spec: return symbol->string_spec;
msousa@350:     case search_init: return symbol->single_byte_character_string;
msousa@350:   }
msousa@350:   ERROR; /* should never occur */
msousa@350:   return NULL;
msousa@350: }
msousa@350: 
msousa@350: /* WSTRING '[' integer ']' 
msousa@350:  * WSTRING ASSIGN double_byte_character_string
msousa@350:  * WSTRING '[' integer ']' ASSIGN double_byte_character_string
msousa@350:  */
msousa@350: void *spec_init_sperator_c::visit(double_byte_string_spec_c *symbol) {
msousa@350:   TRACE("spec_init_sperator_c::double_byte_string_spec_c");
msousa@350:   switch (search_what) {
msousa@350:     case search_spec: return symbol->string_spec;
msousa@350:     case search_init: return symbol->double_byte_character_string;
msousa@350:   }
msousa@350:   ERROR; /* should never occur */
msousa@350:   return NULL;
msousa@350: }
msousa@350: 
msousa@350: 
mario@181: spec_init_sperator_c *spec_init_sperator_c ::class_instance = NULL;
mario@181: spec_init_sperator_c::search_what_t spec_init_sperator_c::search_what;