mario@181: /*
mario@181:  * (c) 2003 Mario de Sousa
mario@181:  *
mario@181:  * Offered to the public under the terms of the GNU General Public License
mario@181:  * as published by the Free Software Foundation; either version 2 of the
mario@181:  * License, or (at your option) any later version.
mario@181:  *
mario@181:  * This program is distributed in the hope that it will be useful, but
mario@181:  * WITHOUT ANY WARRANTY; without even the implied warranty of
mario@181:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
mario@181:  * Public License for more details.
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: /*
mario@181:  * An IEC 61131-3 IL and ST 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"
mario@181: 
mario@181: #define ERROR error_exit(__FILE__,__LINE__)
mario@181: /* function defined in main.cc */
mario@181: extern void error_exit(const char *file_name, int line_no);
mario@181: 
mario@181: 
mario@181: 
mario@181: search_base_type_c::search_base_type_c(void) {current_type_name = NULL;}
mario@181: 
mario@181: void *search_base_type_c::visit(identifier_c *type_name) {
mario@181:   this->current_type_name = type_name;
mario@181:   /* look up the type declaration... */
mario@181:   symbol_c *type_decl = type_symtable.find_value(type_name);
mario@181:   if (type_decl == type_symtable.end_value())
mario@181:     /* Type declaration not found!! */
mario@181:     ERROR;
mario@181: 
mario@181:   return type_decl->accept(*this);
mario@181: }
mario@181: 
mario@181: bool search_base_type_c::type_is_subrange(symbol_c* type_decl) {
mario@181:   this->is_subrange = false;
mario@181:   type_decl->accept(*this);
mario@181:   return this->is_subrange;
mario@181: }
mario@181: 
mario@181: bool search_base_type_c::type_is_enumerated(symbol_c* type_decl) {
mario@181:   this->is_enumerated = false;
mario@181:   type_decl->accept(*this);
mario@181:   return this->is_enumerated;
mario@181: }
mario@181: 
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:   */
ccb@202: void *search_base_type_c::visit(real_c *symbol)          	{return (void *)symbol;}
ccb@202: void *search_base_type_c::visit(integer_c *symbol)       	{return (void *)symbol;}
ccb@202: void *search_base_type_c::visit(binary_integer_c *symbol)	{return (void *)symbol;}
ccb@202: void *search_base_type_c::visit(octal_integer_c *symbol) 	{return (void *)symbol;}
ccb@202: void *search_base_type_c::visit(hex_integer_c *symbol)   	{return (void *)symbol;}
ccb@202: 
ccb@202: 
mario@181: /***********************************/
mario@181: /* B 1.3.1 - Elementary Data Types */
mario@181: /***********************************/
mario@181: void *search_base_type_c::visit(time_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(bool_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(sint_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(int_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(dint_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(lint_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(usint_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(uint_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(udint_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(ulint_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(real_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(lreal_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(date_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(tod_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(dt_type_name_c *symbol)		{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(byte_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(word_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(dword_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(lword_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(string_type_name_c *symbol)	{return (void *)symbol;}
mario@181: void *search_base_type_c::visit(wstring_type_name_c *symbol)	{return (void *)symbol;}
ccb@202: /*
ccb@202: void *search_base_type_c::visit(constant_int_type_name_c *symbol)	{return (void *)symbol;}
ccb@202: void *search_base_type_c::visit(constant_real_type_name_c *symbol)	{return (void *)symbol;}
ccb@202: */
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: /******************************************************/
mario@181: void *search_base_type_c::visit(safebool_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:   this->is_subrange = true;
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 */
mario@181: 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;
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) {
mario@181:   this->is_enumerated = true;
mario@181:   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 */
mario@181: void *search_base_type_c::visit(enumerated_value_list_c *symbol) {
mario@181:   if (NULL == this->current_type_name) ERROR;
mario@181:   return (void *)this->current_type_name;
mario@181: }
mario@181: 
mario@181: /* enumerated_type_name '#' identifier */
mario@181: // SYM_REF2(enumerated_value_c, type, value)
mario@181: 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) {
mario@181:   return symbol->array_specification->accept(*this);
mario@181: }
mario@181: 
mario@181: /* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
mario@181: void *search_base_type_c::visit(array_specification_c *symbol)	{
mario@181:   if (NULL == this->current_type_name) ERROR;
mario@181:   return symbol->non_generic_type_name->accept(*this);
mario@181: }
mario@181: 
mario@181: /* helper symbol for array_specification */
mario@181: /* array_subrange_list ',' subrange */
mario@181: 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 */
mario@181: 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 ! */
mario@181: 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: 
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 ';' */
mario@181: void *search_base_type_c::visit(structure_element_declaration_list_c *symbol)	{
mario@181:   if (NULL == this->current_type_name) ERROR;
mario@181:   return (void *)symbol;
mario@181: }
mario@181: 
mario@181: /*  structure_element_name ':' *_spec_init */
mario@181: 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 */
mario@181: 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 */
mario@181: 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: */
mario@181: void *search_base_type_c::visit(string_type_declaration_c *symbol)	{return symbol;}
mario@181: 
ccb@202:   
ccb@202: 
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)
ccb@202: void *search_base_type_c::visit(function_block_declaration_c *symbol) {
ccb@202:   return symbol;
ccb@202: }
ccb@202: