mario@181: /*
msousa@265:  *  matiec - a compiler for the programming languages defined in IEC 61131-3
msousa@265:  *
msousa@417:  *  Copyright (C) 2003-2012  Mario de Sousa (msousa@fe.up.pt)
Edouard@279:  *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
msousa@265:  *
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: /* Determine the data type on which another data type is based on.
mario@181:  * If a new default initial value is given, we DO NOT consider it a
mario@181:  * new base class, and continue looking further!
mario@181:  *
mario@181:  * E.g. TYPE new_int_t : INT; END_TYPE;
mario@181:  *      TYPE new_int2_t : INT = 2; END_TYPE;
mario@181:  *      TYPE new_subr_t : INT (4..5); END_TYPE;
mario@181:  *
mario@181:  *    new_int_t is really an INT!!
mario@181:  *    new_int2_t is also really an INT!!
mario@181:  *    new_subr_t is also really an INT!!
ccb@202:  *
ccb@202:  * Note that a FB declaration is also considered a base type, as
ccb@202:  * we may have FB instances declared of a specific FB type.
mario@181:  */
mario@181: #include "absyntax_utils.hh"
msousa@596: #include "../main.hh" // required for ERROR() and ERROR_MSG() macros.
mario@181: 
mario@181: 
msousa@718: /* pointer to singleton instance */
msousa@718: search_base_type_c *search_base_type_c::search_base_type_singleton = NULL;
msousa@718: 
msousa@718: 
mario@181: 
msousa@726: search_base_type_c::search_base_type_c(void) {current_type_name = NULL; current_basetype = NULL;}
mario@181: 
msousa@718: /* static method! */
msousa@718: void search_base_type_c::create_singleton(void) {
msousa@718:   if (NULL == search_base_type_singleton)   search_base_type_singleton = new search_base_type_c();
msousa@718:   if (NULL == search_base_type_singleton)   ERROR;
msousa@718: }
msousa@718: 
msousa@718: /* static method! */
msousa@417: symbol_c *search_base_type_c::get_basetype_decl(symbol_c *symbol) {
msousa@718:   create_singleton();
msousa@718:   if (NULL == symbol)    return NULL; 
msousa@726:   search_base_type_singleton->current_type_name = NULL;
msousa@726:   search_base_type_singleton->current_basetype  = NULL; 
msousa@718:   return (symbol_c *)symbol->accept(*search_base_type_singleton);
msousa@718: }
msousa@718: 
msousa@718: /* static method! */
msousa@417: symbol_c *search_base_type_c::get_basetype_id  (symbol_c *symbol) {
msousa@718:   create_singleton();
msousa@726:   if (NULL == symbol)    return NULL; 
msousa@718:   search_base_type_singleton->current_type_name = NULL;
msousa@726:   search_base_type_singleton->current_basetype  = NULL; 
msousa@718:   symbol->accept(*search_base_type_singleton);
msousa@718:   return (symbol_c *)search_base_type_singleton->current_type_name;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: 
msousa@417: /*************************/
msousa@417: /* B.1 - Common elements */
msousa@417: /*************************/
msousa@417: 
msousa@417: /*******************************************/
msousa@417: /* B 1.1 - Letters, digits and identifiers */
msousa@417: /*******************************************/
msousa@417: void *search_base_type_c::visit(identifier_c *type_name) {
msousa@417:   symbol_c *type_decl;
msousa@417: 
msousa@417:   this->current_type_name = type_name;
msousa@726:   /* if we have reached this point, it is because the current_basetype is not yet pointing to the base datatype we are looking for,
msousa@726:    * so we will be searching for the delcaration of the type named in type_name, which might be the base datatype (we search recursively!)
msousa@726:    */
msousa@726:   this->current_basetype  = NULL; 
msousa@417:   
msousa@417:   /* look up the type declaration... */
msousa@417:   type_decl = type_symtable.find_value(type_name);
msousa@417:   if (type_decl != type_symtable.end_value())
msousa@417:     return type_decl->accept(*this);
msousa@417:     
msousa@417:   type_decl = function_block_type_symtable.find_value(type_name);
msousa@417:   if (type_decl != function_block_type_symtable.end_value())
msousa@417:     return type_decl->accept(*this);
msousa@417:   
msousa@417:   /* Type declaration not found!! */
msousa@417:     ERROR;
msousa@417:     
msousa@417:   return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
ccb@202: /*********************/
ccb@202: /* B 1.2 - Constants */
ccb@202: /*********************/
ccb@202: 
ccb@202: /******************************/
ccb@202: /* B 1.2.1 - Numeric Literals */
ccb@202: /******************************/
ccb@202:  /* Numeric literals without any explicit type cast have unknown data type, 
ccb@202:   * so we continue considering them as their own basic data types until
ccb@202:   * they can be resolved (for example, when using '30+x' where 'x' is a LINT variable, the
ccb@202:   * numeric literal '30' must then be considered a LINT so the ADD function may be called
ccb@202:   * with all inputs of the same data type.
ccb@202:   * If 'x' were a SINT, then the '30' would have to be a SINT too!
ccb@202:   */
msousa@617: void *search_base_type_c::visit(real_c *symbol)                   {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(neg_real_c *symbol)               {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(integer_c *symbol)                {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(neg_integer_c *symbol)            {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(binary_integer_c *symbol)         {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(octal_integer_c *symbol)          {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(hex_integer_c *symbol)            {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(boolean_true_c *symbol)           {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(boolean_false_c *symbol)          {return (void *)symbol;}
ccb@202: 
ccb@202: 
mario@181: /***********************************/
mario@181: /* B 1.3.1 - Elementary Data Types */
mario@181: /***********************************/
msousa@617: void *search_base_type_c::visit(time_type_name_c *symbol)         {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(bool_type_name_c *symbol)         {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(sint_type_name_c *symbol)         {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(int_type_name_c *symbol)          {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(dint_type_name_c *symbol)         {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(lint_type_name_c *symbol)         {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(usint_type_name_c *symbol)        {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(uint_type_name_c *symbol)         {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(udint_type_name_c *symbol)        {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(ulint_type_name_c *symbol)        {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(real_type_name_c *symbol)         {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(lreal_type_name_c *symbol)        {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(date_type_name_c *symbol)         {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(tod_type_name_c *symbol)          {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(dt_type_name_c *symbol)           {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(byte_type_name_c *symbol)         {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(word_type_name_c *symbol)         {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(dword_type_name_c *symbol)        {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(lword_type_name_c *symbol)        {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(string_type_name_c *symbol)       {return (void *)symbol;}
msousa@617: void *search_base_type_c::visit(wstring_type_name_c *symbol)      {return (void *)symbol;}
msousa@257: 
msousa@257: 
mario@181: /******************************************************/
mario@181: /* Extensions to the base standard as defined in      */
mario@181: /* "Safety Software Technical Specification,          */
mario@181: /*  Part 1: Concepts and Function Blocks,             */
mario@181: /*  Version 1.0 – Official Release"                   */
mario@181: /* by PLCopen - Technical Committee 5 - 2006-01-31    */
mario@181: /******************************************************/
msousa@257: 
msousa@257: void *search_base_type_c::visit(safetime_type_name_c *symbol)     {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safebool_type_name_c *symbol)     {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safesint_type_name_c *symbol)     {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safeint_type_name_c *symbol)      {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safedint_type_name_c *symbol)     {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safelint_type_name_c *symbol)     {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safeusint_type_name_c *symbol)    {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safeuint_type_name_c *symbol)     {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safeudint_type_name_c *symbol)    {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safeulint_type_name_c *symbol)    {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safereal_type_name_c *symbol)     {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safelreal_type_name_c *symbol)    {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safedate_type_name_c *symbol)     {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safetod_type_name_c *symbol)      {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safedt_type_name_c *symbol)       {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safebyte_type_name_c *symbol)     {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safeword_type_name_c *symbol)     {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safedword_type_name_c *symbol)    {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safelword_type_name_c *symbol)    {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safestring_type_name_c *symbol)   {return (void *)symbol;}
msousa@257: void *search_base_type_c::visit(safewstring_type_name_c *symbol)  {return (void *)symbol;}
mario@181: 
mario@181: /********************************/
mario@181: /* B 1.3.3 - Derived data types */
mario@181: /********************************/
mario@181: /*  simple_type_name ':' simple_spec_init */
mario@181: void *search_base_type_c::visit(simple_type_declaration_c *symbol) {
mario@181:   return symbol->simple_spec_init->accept(*this);
mario@181: }
mario@181: /* simple_specification ASSIGN constant */
mario@181: void *search_base_type_c::visit(simple_spec_init_c *symbol) {
mario@181:   return symbol->simple_specification->accept(*this);
mario@181: }
mario@181: 
mario@181: /*  subrange_type_name ':' subrange_spec_init */
mario@181: void *search_base_type_c::visit(subrange_type_declaration_c *symbol) {
mario@181:   return symbol->subrange_spec_init->accept(*this);
mario@181: }
mario@181: 
mario@181: /* subrange_specification ASSIGN signed_integer */
mario@181: void *search_base_type_c::visit(subrange_spec_init_c *symbol) {
mario@181:   return symbol->subrange_specification->accept(*this);
mario@181: }
mario@181: 
mario@181: /*  integer_type_name '(' subrange')' */
mario@181: void *search_base_type_c::visit(subrange_specification_c *symbol) {
mario@181:   return symbol->integer_type_name->accept(*this);
mario@181: }
mario@181: 
mario@181: /*  signed_integer DOTDOT signed_integer */
msousa@617: void *search_base_type_c::visit(subrange_c *symbol)                                     {ERROR; return NULL;} /* should never get called... */
mario@181: 
mario@181: /*  enumerated_type_name ':' enumerated_spec_init */
mario@181: void *search_base_type_c::visit(enumerated_type_declaration_c *symbol) {
mario@181:   this->current_type_name = symbol->enumerated_type_name;
msousa@726:   /* NOTE: We want search_base_type_c to return a enumerated_type_declaration_c as the base datatpe if possible
msousa@726:    *       (i.e. if it is a named datatype declared inside a TYPE ... END_TYPE declarations, as opposed to an
msousa@726:    *        anonymous datatype declared in a VAR ... AND_VAR declaration).
msousa@726:    *       However, we cannot return this symbol just yet, as it may not be the final base datatype.
msousa@726:    *       So we store it in a temporary current_basetype variable!
msousa@726:    */
msousa@726:   this->current_basetype  = symbol; 
mario@181:   return symbol->enumerated_spec_init->accept(*this);
mario@181: }
mario@181: 
mario@181: /* enumerated_specification ASSIGN enumerated_value */
mario@181: void *search_base_type_c::visit(enumerated_spec_init_c *symbol) {
msousa@726:   // current_basetype may have been set in the previous enumerated_type_declaration_c visitor, in which case we do not want to overwrite the value!
msousa@726:   if (NULL == this->current_basetype)
msousa@726:     this->current_basetype  = symbol; 
msousa@726:   /* NOTE: the following line may call either the visitor to 
msousa@726:    *         - identifier_c, in which case this is not yet the base datatype we are looking for (it will set current_basetype to NULL!)
msousa@726:    *         - enumerated_value_list_c, in which case we have found the base datatype.
msousa@726:    */
msousa@726:   return symbol->enumerated_specification->accept(*this); 
mario@181: }
mario@181: 
mario@181: /* helper symbol for enumerated_specification->enumerated_spec_init */
mario@181: /* enumerated_value_list ',' enumerated_value */
msousa@652: void *search_base_type_c::visit(enumerated_value_list_c *symbol) {
msousa@726:   // current_basetype may have been set in the previous enumerated_type_declaration_c or enumerated_spec_init_c visitors, in which case we do not want to overwrite the value!
msousa@726:   if (NULL == this->current_basetype) 
msousa@726:     this->current_basetype  = symbol; 
msousa@726:   return (void *)current_basetype;
msousa@652: }
mario@181: 
mario@181: /* enumerated_type_name '#' identifier */
mario@181: // SYM_REF2(enumerated_value_c, type, value)
msousa@617: void *search_base_type_c::visit(enumerated_value_c *symbol)                             {ERROR; return NULL;} /* should never get called... */
mario@181: 
mario@181: /*  identifier ':' array_spec_init */
mario@181: void *search_base_type_c::visit(array_type_declaration_c *symbol) {
mario@181:   this->current_type_name = symbol->identifier;
mario@181:   return symbol->array_spec_init->accept(*this);
mario@181: }
mario@181: 
mario@181: /* array_specification [ASSIGN array_initialization} */
mario@181: /* array_initialization may be NULL ! */
mario@181: void *search_base_type_c::visit(array_spec_init_c *symbol) {
msousa@417:   /* Note that the 'array_specification' may be either an identifier of a previsously defined array type, 
msousa@417:    * or an array_specification_c, so we can not stop here and simply return a array_spec_init_c, 
msousa@417:    * especially if we are looking for the base class!
msousa@417:    */  
mario@181:   return symbol->array_specification->accept(*this);
mario@181: }
mario@181: 
mario@181: /* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
msousa@617: void *search_base_type_c::visit(array_specification_c *symbol)                          {return (void *)symbol;}
mario@181: 
mario@181: /* helper symbol for array_specification */
mario@181: /* array_subrange_list ',' subrange */
msousa@617: void *search_base_type_c::visit(array_subrange_list_c *symbol)                          {ERROR; return NULL;} /* should never get called... */
mario@181: 
mario@181: /* array_initialization:  '[' array_initial_elements_list ']' */
mario@181: /* helper symbol for array_initialization */
mario@181: /* array_initial_elements_list ',' array_initial_elements */
msousa@617: void *search_base_type_c::visit(array_initial_elements_list_c *symbol)                  {ERROR; return NULL;} /* should never get called... */
mario@181: 
mario@181: /* integer '(' [array_initial_element] ')' */
mario@181: /* array_initial_element may be NULL ! */
msousa@617: void *search_base_type_c::visit(array_initial_elements_c *symbol)                       {ERROR; return NULL;} /* should never get called... */
mario@181: 
mario@181: /*  structure_type_name ':' structure_specification */
mario@181: /* NOTE: structure_specification will point to either a
mario@181:  *       initialized_structure_c
mario@181:  *       OR A
mario@181:  *       structure_element_declaration_list_c
mario@181:  */
mario@181: void *search_base_type_c::visit(structure_type_declaration_c *symbol)  {
mario@181:   this->current_type_name = symbol->structure_type_name;
mario@181:   return symbol->structure_specification->accept(*this);
mario@181: }
mario@181: 
Laurent@412: /*  var1_list ':' structure_type_name */
Laurent@412: void *search_base_type_c::visit(structured_var_declaration_c *symbol) {
Laurent@625: 	return symbol;
Laurent@412: }
Laurent@412: 
mario@181: /* structure_type_name ASSIGN structure_initialization */
mario@181: /* structure_initialization may be NULL ! */
mario@181: void *search_base_type_c::visit(initialized_structure_c *symbol)	{
mario@181:   return symbol->structure_type_name->accept(*this);
mario@181: }
mario@181: 
mario@181: /* helper symbol for structure_declaration */
mario@181: /* structure_declaration:  STRUCT structure_element_declaration_list END_STRUCT */
mario@181: /* structure_element_declaration_list structure_element_declaration ';' */
msousa@617: void *search_base_type_c::visit(structure_element_declaration_list_c *symbol)           {return (void *)symbol;}
mario@181: 
mario@181: /*  structure_element_name ':' *_spec_init */
msousa@617: void *search_base_type_c::visit(structure_element_declaration_c *symbol)                {ERROR; return NULL;} /* should never get called... */
mario@181: 
mario@181: /* helper symbol for structure_initialization */
mario@181: /* structure_initialization: '(' structure_element_initialization_list ')' */
mario@181: /* structure_element_initialization_list ',' structure_element_initialization */
msousa@617: void *search_base_type_c::visit(structure_element_initialization_list_c *symbol)        {ERROR; return NULL;} /* should never get called... */
mario@181: 
mario@181: /*  structure_element_name ASSIGN value */
msousa@617: void *search_base_type_c::visit(structure_element_initialization_c *symbol)             {ERROR; return NULL;} /* should never get called... */
mario@181: 
mario@181: /*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */
mario@181: /*
mario@181: SYM_REF4(string_type_declaration_c,	string_type_name,
mario@181: 					elementary_string_type_name,
mario@181: 					string_type_declaration_size,
mario@181: 					string_type_declaration_init) // may be == NULL!
mario@181: */
msousa@617: void *search_base_type_c::visit(string_type_declaration_c *symbol)	                {return (void *)symbol;}
mario@181: 
msousa@808: 
msousa@810: /*  function_block_type_name ASSIGN structure_initialization */
msousa@808: /* structure_initialization -> may be NULL ! */
msousa@810: // SYM_REF2(fb_spec_init_c, function_block_type_name, structure_initialization)
msousa@810: void *search_base_type_c::visit(fb_spec_init_c *symbol)	{
msousa@808:   return symbol->function_block_type_name->accept(*this);
msousa@808: }
msousa@808: 
ccb@202: 
msousa@810: 
ccb@202: /*****************************/
ccb@202: /* B 1.5.2 - Function Blocks */
ccb@202: /*****************************/
ccb@202: /*  FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */
ccb@202: // SYM_REF3(function_block_declaration_c, fblock_name, var_declarations, fblock_body)
Laurent@706: void *search_base_type_c::visit(function_block_declaration_c *symbol)                   {
Laurent@706: 	return (void *)symbol;
Laurent@706: }
msousa@617: 
msousa@617: 
msousa@617: 
msousa@619: /*********************************************/
msousa@619: /* B.1.6  Sequential function chart elements */
msousa@619: /*********************************************/
msousa@619: /* INITIAL_STEP step_name ':' action_association_list END_STEP */
msousa@619: // SYM_REF2(initial_step_c, step_name, action_association_list)
msousa@619: void *search_base_type_c::visit(initial_step_c *symbol) {
msousa@619:   this->current_type_name = NULL; /* this pseudo data type does not have a type name! */
msousa@619:   return (void *)symbol;
msousa@619: }
msousa@619: 
msousa@619: /* STEP step_name ':' action_association_list END_STEP */
msousa@619: // SYM_REF2(step_c, step_name, action_association_list)
msousa@619: void *search_base_type_c::visit(step_c *symbol) {
msousa@619:   this->current_type_name = NULL; /* this pseudo data type does not have a type name! */
msousa@619:   return (void *)symbol;
msousa@619: }
msousa@619: