author | mario |
Mon, 25 May 2009 12:17:10 +0200 | |
changeset 177 | 697562a5da7c |
parent 160 | 59d58f5e6caa |
permissions | -rwxr-xr-x |
70 | 1 |
/* |
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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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* 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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/* Determine the data type on which another data type is based on. |
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* If a new default initial value is given, we DO NOT consider it a |
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* new base class, and continue looking further! |
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* |
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* E.g. TYPE new_int_t : INT; END_TYPE; |
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* TYPE new_int2_t : INT = 2; END_TYPE; |
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* TYPE new_subr_t : INT (4..5); END_TYPE; |
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* |
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* new_int_t is really an INT!! |
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* new_int2_t is also really an INT!! |
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* new_subr_t is also really an INT!! |
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*/ |
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class search_base_type_c: public null_visitor_c { |
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private: |
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symbol_c *current_type_name; |
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bool is_subrange; |
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bool is_enumerated; |
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public: |
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search_base_type_c(void) {current_type_name = NULL;} |
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public: |
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void *visit(identifier_c *type_name) { |
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this->current_type_name = type_name; |
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/* look up the type declaration... */ |
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symbol_c *type_decl = type_symtable.find_value(type_name); |
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if (type_decl == type_symtable.end_value()) |
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/* Type declaration not found!! */ |
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ERROR; |
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return type_decl->accept(*this); |
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} |
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bool type_is_subrange(symbol_c* type_decl) { |
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this->is_subrange = false; |
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type_decl->accept(*this); |
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return this->is_subrange; |
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} |
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bool type_is_enumerated(symbol_c* type_decl) { |
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this->is_enumerated = false; |
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type_decl->accept(*this); |
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return this->is_enumerated; |
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} |
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/***********************************/ |
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/* B 1.3.1 - Elementary Data Types */ |
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/***********************************/ |
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void *visit(time_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(bool_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(sint_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(int_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(dint_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(lint_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(usint_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(uint_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(udint_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(ulint_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(real_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(lreal_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(date_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(tod_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(dt_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(byte_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(word_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(dword_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(lword_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(string_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(wstring_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(constant_int_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(constant_real_type_name_c *symbol) {return (void *)symbol;} |
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void *visit(direct_variable_type_name_c *symbol) {return (void *)symbol;} |
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/******************************************************/ |
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/* Extensions to the base standard as defined in */ |
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/* "Safety Software Technical Specification, */ |
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/* Part 1: Concepts and Function Blocks, */ |
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/* Version 1.0 – Official Release" */ |
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/* by PLCopen - Technical Committee 5 - 2006-01-31 */ |
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/******************************************************/ |
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void *visit(safebool_type_name_c *symbol) {return (void *)symbol;} |
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/********************************/ |
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/* B 1.3.3 - Derived data types */ |
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/********************************/ |
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/* simple_type_name ':' simple_spec_init */ |
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void *visit(simple_type_declaration_c *symbol) { |
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return symbol->simple_spec_init->accept(*this); |
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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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return symbol->simple_specification->accept(*this); |
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} |
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/* subrange_type_name ':' subrange_spec_init */ |
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void *visit(subrange_type_declaration_c *symbol) { |
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return symbol->subrange_spec_init->accept(*this); |
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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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this->is_subrange = true; |
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return symbol->subrange_specification->accept(*this); |
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} |
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/* integer_type_name '(' subrange')' */ |
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void *visit(subrange_specification_c *symbol) { |
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return symbol->integer_type_name->accept(*this); |
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} |
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/* signed_integer DOTDOT signed_integer */ |
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void *visit(subrange_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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/* enumerated_type_name ':' enumerated_spec_init */ |
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void *visit(enumerated_type_declaration_c *symbol) { |
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this->current_type_name = symbol->enumerated_type_name; |
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return symbol->enumerated_spec_init->accept(*this); |
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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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this->is_enumerated = true; |
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return symbol->enumerated_specification->accept(*this); |
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} |
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/* helper symbol for enumerated_specification->enumerated_spec_init */ |
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/* enumerated_value_list ',' enumerated_value */ |
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void *visit(enumerated_value_list_c *symbol) { |
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if (NULL == this->current_type_name) ERROR; |
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return (void *)this->current_type_name; |
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} |
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/* enumerated_type_name '#' identifier */ |
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// SYM_REF2(enumerated_value_c, type, value) |
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void *visit(enumerated_value_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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/* identifier ':' array_spec_init */ |
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void *visit(array_type_declaration_c *symbol) { |
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this->current_type_name = symbol->identifier; |
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return symbol->array_spec_init->accept(*this); |
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} |
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/* array_specification [ASSIGN array_initialization} */ |
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/* array_initialization may be NULL ! */ |
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void *visit(array_spec_init_c *symbol) { |
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return symbol->array_specification->accept(*this); |
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} |
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/* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */ |
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void *visit(array_specification_c *symbol) { |
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if (NULL == this->current_type_name) ERROR; |
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return symbol->non_generic_type_name->accept(*this); |
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} |
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/* helper symbol for array_specification */ |
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/* array_subrange_list ',' subrange */ |
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void *visit(array_subrange_list_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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/* array_initialization: '[' array_initial_elements_list ']' */ |
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/* helper symbol for array_initialization */ |
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/* array_initial_elements_list ',' array_initial_elements */ |
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void *visit(array_initial_elements_list_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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/* integer '(' [array_initial_element] ')' */ |
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/* array_initial_element may be NULL ! */ |
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void *visit(array_initial_elements_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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/* structure_type_name ':' structure_specification */ |
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/* NOTE: structure_specification will point to either a |
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* initialized_structure_c |
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* OR A |
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* structure_element_declaration_list_c |
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*/ |
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void *visit(structure_type_declaration_c *symbol) { |
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this->current_type_name = symbol->structure_type_name; |
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return symbol->structure_specification->accept(*this); |
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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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void *visit(initialized_structure_c *symbol) { |
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return symbol->structure_type_name->accept(*this); |
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} |
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/* helper symbol for structure_declaration */ |
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/* structure_declaration: STRUCT structure_element_declaration_list END_STRUCT */ |
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/* structure_element_declaration_list structure_element_declaration ';' */ |
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void *visit(structure_element_declaration_list_c *symbol) { |
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if (NULL == this->current_type_name) ERROR; |
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return (void *)symbol; |
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} |
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/* structure_element_name ':' *_spec_init */ |
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void *visit(structure_element_declaration_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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/* helper symbol for structure_initialization */ |
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/* structure_initialization: '(' structure_element_initialization_list ')' */ |
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/* structure_element_initialization_list ',' structure_element_initialization */ |
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void *visit(structure_element_initialization_list_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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/* structure_element_name ASSIGN value */ |
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void *visit(structure_element_initialization_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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/* string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */ |
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/* |
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SYM_REF4(string_type_declaration_c, string_type_name, |
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elementary_string_type_name, |
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string_type_declaration_size, |
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string_type_declaration_init) // may be == NULL! |
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*/ |
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void *visit(string_type_declaration_c *symbol) {return symbol;} |
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}; |
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