lbessard@70: /*
lbessard@70:  * (c) 2003 Mario de Sousa
lbessard@70:  *
lbessard@70:  * Offered to the public under the terms of the GNU General Public License
lbessard@70:  * as published by the Free Software Foundation; either version 2 of the
lbessard@70:  * License, or (at your option) any later version.
lbessard@70:  *
lbessard@70:  * This program is distributed in the hope that it will be useful, but
lbessard@70:  * WITHOUT ANY WARRANTY; without even the implied warranty of
lbessard@70:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
lbessard@70:  * Public License for more details.
lbessard@70:  *
lbessard@70:  * This code is made available on the understanding that it will not be
lbessard@70:  * used in safety-critical situations without a full and competent review.
lbessard@70:  */
lbessard@70: 
lbessard@70: /*
lbessard@70:  * An IEC 61131-3 IL and ST compiler.
lbessard@70:  *
lbessard@70:  * Based on the
lbessard@70:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
lbessard@70:  *
lbessard@70:  */
lbessard@70: 
lbessard@70: 
lbessard@70: /* Determine the data type on which another data type is based on.
lbessard@70:  * If a new default initial value is given, we DO NOT consider it a
lbessard@70:  * new base class, and continue looking further!
lbessard@70:  *
lbessard@70:  * E.g. TYPE new_int_t : INT; END_TYPE;
lbessard@70:  *      TYPE new_int2_t : INT = 2; END_TYPE;
lbessard@70:  *      TYPE new_subr_t : INT (4..5); END_TYPE;
lbessard@70:  *
lbessard@70:  *    new_int_t is really an INT!!
lbessard@70:  *    new_int2_t is also really an INT!!
lbessard@70:  *    new_subr_t is also really an INT!!
lbessard@70:  */
lbessard@70: class search_base_type_c: public null_visitor_c {
lbessard@70:   private:
lbessard@70:     symbol_c *current_type_name;
lbessard@98:     bool is_subrange;
lbessard@70: 
lbessard@70:   public:
lbessard@70:     search_base_type_c(void) {current_type_name = NULL;}
lbessard@98:     bool base_is_subrange() {return this->is_subrange;}
lbessard@70: 
lbessard@70:   public:
lbessard@70:     void *visit(identifier_c *type_name) {
lbessard@70:       this->current_type_name = type_name;
lbessard@70:       /* look up the type declaration... */
lbessard@70:       symbol_c *type_decl = type_symtable.find_value(type_name);
lbessard@70:       if (type_decl == type_symtable.end_value())
lbessard@70:         /* Type declaration not found!! */
lbessard@70:         ERROR;
lbessard@70: 
lbessard@70:       return type_decl->accept(*this);
lbessard@70:     }
lbessard@98:     
lbessard@98:     void *explore_type(symbol_c* type_decl) {
lbessard@98:       this->is_subrange = false;
lbessard@98:       return type_decl->accept(*this);
lbessard@98:     }
lbessard@70: 
lbessard@70: /***********************************/
lbessard@70: /* B 1.3.1 - Elementary Data Types */
lbessard@70: /***********************************/
lbessard@70:     void *visit(time_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(bool_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(sint_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(int_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(dint_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(lint_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(usint_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(uint_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(udint_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(ulint_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(real_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(lreal_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(date_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(tod_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(dt_type_name_c *symbol)		{return (void *)symbol;}
lbessard@70:     void *visit(byte_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(word_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(dword_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(lword_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(string_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(wstring_type_name_c *symbol)	{return (void *)symbol;}
lbessard@70:     void *visit(constant_int_type_name_c *symbol)    {return (void *)symbol;}
lbessard@70:     void *visit(constant_real_type_name_c *symbol)    {return (void *)symbol;}
lbessard@70: 
lbessard@70: /********************************/
lbessard@70: /* B 1.3.3 - Derived data types */
lbessard@70: /********************************/
lbessard@70: /*  simple_type_name ':' simple_spec_init */
lbessard@70:     void *visit(simple_type_declaration_c *symbol) {
lbessard@70:       return symbol->simple_spec_init->accept(*this);
lbessard@70:     }
lbessard@70: /* simple_specification ASSIGN constant */
lbessard@70:     void *visit(simple_spec_init_c *symbol) {
lbessard@70:       return symbol->simple_specification->accept(*this);
lbessard@70:     }
lbessard@70: 
lbessard@70: /*  subrange_type_name ':' subrange_spec_init */
lbessard@70:     void *visit(subrange_type_declaration_c *symbol) {
lbessard@70:       return symbol->subrange_spec_init->accept(*this);
lbessard@70:     }
lbessard@70: 
lbessard@70: /* subrange_specification ASSIGN signed_integer */
lbessard@70:     void *visit(subrange_spec_init_c *symbol) {
lbessard@98:       this->is_subrange = true;
lbessard@70:       return symbol->subrange_specification->accept(*this);
lbessard@70:     }
lbessard@70: 
lbessard@70: /*  integer_type_name '(' subrange')' */
lbessard@70:     void *visit(subrange_specification_c *symbol) {
lbessard@70:       return symbol->integer_type_name->accept(*this);
lbessard@70:     }
lbessard@70: 
lbessard@70: /*  signed_integer DOTDOT signed_integer */
lbessard@70:     void *visit(subrange_c *symbol) {ERROR; return NULL;} /* should never get called... */
lbessard@70: 
lbessard@70: /*  enumerated_type_name ':' enumerated_spec_init */
lbessard@70:     void *visit(enumerated_type_declaration_c *symbol) {
lbessard@70:       this->current_type_name = symbol->enumerated_type_name;
lbessard@70:       return symbol->enumerated_spec_init->accept(*this);
lbessard@70:     }
lbessard@70: 
lbessard@70: /* enumerated_specification ASSIGN enumerated_value */
lbessard@70:     void *visit(enumerated_spec_init_c *symbol) {
lbessard@70:       return symbol->enumerated_specification->accept(*this);
lbessard@70:     }
lbessard@70: 
lbessard@70: /* helper symbol for enumerated_specification->enumerated_spec_init */
lbessard@70: /* enumerated_value_list ',' enumerated_value */
lbessard@70:     void *visit(enumerated_value_list_c *symbol) {
lbessard@70:       if (NULL == this->current_type_name) ERROR;
lbessard@70:       return (void *)this->current_type_name;
lbessard@70:     }
lbessard@70: 
lbessard@70: /* enumerated_type_name '#' identifier */
lbessard@70: // SYM_REF2(enumerated_value_c, type, value)
lbessard@70:     void *visit(enumerated_value_c *symbol) {ERROR; return NULL;} /* should never get called... */
lbessard@70: 
lbessard@70: /*  identifier ':' array_spec_init */
lbessard@70:     void *visit(array_type_declaration_c *symbol) {
lbessard@70:       this->current_type_name = symbol->identifier;
lbessard@70:       return symbol->array_spec_init->accept(*this);
lbessard@70:     }
lbessard@70: 
lbessard@70: /* array_specification [ASSIGN array_initialization} */
lbessard@70: /* array_initialization may be NULL ! */
lbessard@70:     void *visit(array_spec_init_c *symbol) {
lbessard@70:       return symbol->array_specification->accept(*this);
lbessard@70:     }
lbessard@70: 
lbessard@70: /* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
lbessard@70:     void *visit(array_specification_c *symbol)	{
lbessard@70:       if (NULL == this->current_type_name) ERROR;
lbessard@98:       return symbol->non_generic_type_name->accept(*this);
lbessard@70:     }
lbessard@70: 
lbessard@70: /* helper symbol for array_specification */
lbessard@70: /* array_subrange_list ',' subrange */
lbessard@70:     void *visit(array_subrange_list_c *symbol)	{ERROR; return NULL;} /* should never get called... */
lbessard@70: 
lbessard@70: /* array_initialization:  '[' array_initial_elements_list ']' */
lbessard@70: /* helper symbol for array_initialization */
lbessard@70: /* array_initial_elements_list ',' array_initial_elements */
lbessard@70:     void *visit(array_initial_elements_list_c *symbol)	{ERROR; return NULL;} /* should never get called... */
lbessard@70: 
lbessard@70: /* integer '(' [array_initial_element] ')' */
lbessard@70: /* array_initial_element may be NULL ! */
lbessard@70:     void *visit(array_initial_elements_c *symbol)	{ERROR; return NULL;} /* should never get called... */
lbessard@70: 
lbessard@70: /*  structure_type_name ':' structure_specification */
lbessard@70:       /* NOTE: structure_specification will point to either a
lbessard@70:        *       initialized_structure_c
lbessard@70:        *       OR A
lbessard@70:        *       structure_element_declaration_list_c
lbessard@70:        */
lbessard@70:     void *visit(structure_type_declaration_c *symbol)  {
lbessard@70:       this->current_type_name = symbol->structure_type_name;
lbessard@70:       return symbol->structure_specification->accept(*this);
lbessard@70:     }
lbessard@70: 
lbessard@70: /* structure_type_name ASSIGN structure_initialization */
lbessard@70: /* structure_initialization may be NULL ! */
lbessard@70:     void *visit(initialized_structure_c *symbol)	{
lbessard@70:       return symbol->structure_type_name->accept(*this);
lbessard@70:     }
lbessard@70: 
lbessard@70: /* helper symbol for structure_declaration */
lbessard@70: /* structure_declaration:  STRUCT structure_element_declaration_list END_STRUCT */
lbessard@70: /* structure_element_declaration_list structure_element_declaration ';' */
lbessard@70:     void *visit(structure_element_declaration_list_c *symbol)	{
lbessard@70:       if (NULL == this->current_type_name) ERROR;
lbessard@70:       return (void *)this->current_type_name;
lbessard@70:     }
lbessard@70: 
lbessard@70: /*  structure_element_name ':' *_spec_init */
lbessard@70:     void *visit(structure_element_declaration_c *symbol) {ERROR; return NULL;} /* should never get called... */
lbessard@70: 
lbessard@70: /* helper symbol for structure_initialization */
lbessard@70: /* structure_initialization: '(' structure_element_initialization_list ')' */
lbessard@70: /* structure_element_initialization_list ',' structure_element_initialization */
lbessard@70:     void *visit(structure_element_initialization_list_c *symbol) {ERROR; return NULL;} /* should never get called... */
lbessard@70: 
lbessard@70: /*  structure_element_name ASSIGN value */
lbessard@70:     void *visit(structure_element_initialization_c *symbol) {ERROR; return NULL;} /* should never get called... */
lbessard@70: 
lbessard@70: /*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */
lbessard@70: /*
lbessard@70: SYM_REF4(string_type_declaration_c,	string_type_name,
lbessard@70: 					elementary_string_type_name,
lbessard@70: 					string_type_declaration_size,
lbessard@70: 					string_type_declaration_init) // may be == NULL!
lbessard@70: */
lbessard@70:     void *visit(string_type_declaration_c *symbol)	{return symbol;}
lbessard@70: };
lbessard@70: 
lbessard@70: 
lbessard@70: 
lbessard@70: