diff -r e657008f43d0 -r da1a8186f86f absyntax_utils/get_sizeof_datatype.hh --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/absyntax_utils/get_sizeof_datatype.hh Thu Aug 27 16:06:46 2009 +0100 @@ -0,0 +1,212 @@ +/* + * (c) 2009 Mario de Sousa + * + * Offered to the public under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General + * Public License for more details. + * + * This code is made available on the understanding that it will not be + * used in safety-critical situations without a full and competent review. + */ + +/* + * An IEC 61131-3 IL and ST compiler. + * + * Based on the + * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10) + * + */ + + +/* Determine the size, in bits, of the data type. + * + * NOTE: Currently, only elementary data types with well defined sizes (in the standard) are supported. + * - derived data types are not supported, and these will return 0 + * - TIME, DATE, TIME_OF_DAY, and DATE_AND_TIME are not supported, and will return 0 + * - STRING and WSTRING are not supported, and the standard merely defines bit per character, + * and not the maximum number of characters, so these will return 0 + * + * We also support the 'Numeric Literals' Data types. + * i.e., numeric literals are considerd basic data types + * as their data type is undefined (e.g. the datat type of '30' + * could be 'INT' or 'SINT' or 'LINT' or 'USINT' or ... + * + * For numeric literals, we return the minimum number of bits + * required to store the value. + * + * E.g. TYPE new_int_t : INT; END_TYPE; + * TYPE new_int2_t : INT = 2; END_TYPE; + * TYPE new_subr_t : INT (4..5); END_TYPE; + * + * sizeof(SINT) -> 8 + * sizeof(INT) -> 16 + * sizeof(DINT) -> 32 + * sizeof(LINT) -> 64 + * + * sizeof('1') -> 1 + * sizeof('015') -> 4 # Leading zeros are ignored! + * sizeof('0') -> 1 # This is a special case! Even the value 0 needs at least 1 bit to store! + * sizeof('16') -> 5 + * sizeof('2#00101') -> 3 + * sizeof('8#334') -> 9 + * sizeof('16#2A') -> 8 + * + * sizeof('7.4') -> 32 # all real literals return 32 bits, the size of a 'REAL' + * # TODO: study IEC 60559 for the range of values that may be + * # stored in a REAL (basic single width floating point format) + * # and in a LREAL (basic double width floating point format) + * # and see if some real literals need to return 64 instead! + */ + +#include "../absyntax/visitor.hh" + +class get_sizeof_datatype_c: public null_visitor_c { + + public: + static int getsize(symbol_c *data_type_symbol); + ~get_sizeof_datatype_c(void); + + private: + /* this class is a singleton. So we need a pointer to the single instance... */ + static get_sizeof_datatype_c *singleton; + + private: + /*********************/ + /* B 1.2 - Constants */ + /*********************/ + + /******************************/ + /* B 1.2.1 - Numeric Literals */ + /******************************/ + /* Numeric literals without any explicit type cast have unknown data type, + * so we continue considering them as their own basic data types until + * they can be resolved (for example, when using '30+x' where 'x' is a LINT variable, the + * numeric literal '30' must then be considered a LINT so the ADD function may be called + * with all inputs of the same data type. + * If 'x' were a SINT, then the '30' would have to be a SINT too! + */ + void *visit(real_c *symbol); + void *visit(integer_c *symbol); + void *visit(binary_integer_c *symbol); + void *visit(octal_integer_c *symbol); + void *visit(hex_integer_c *symbol); + + /***********************************/ + /* B 1.3.1 - Elementary Data Types */ + /***********************************/ +// void *visit(time_type_name_c *symbol); + void *visit(bool_type_name_c *symbol); + void *visit(sint_type_name_c *symbol); + void *visit(int_type_name_c *symbol); + void *visit(dint_type_name_c *symbol); + void *visit(lint_type_name_c *symbol); + void *visit(usint_type_name_c *symbol); + void *visit(uint_type_name_c *symbol); + void *visit(udint_type_name_c *symbol); + void *visit(ulint_type_name_c *symbol); + void *visit(real_type_name_c *symbol); + void *visit(lreal_type_name_c *symbol); +// void *visit(date_type_name_c *symbol); +// void *visit(tod_type_name_c *symbol); +// void *visit(dt_type_name_c *symbol) ; + void *visit(byte_type_name_c *symbol); + void *visit(word_type_name_c *symbol); + void *visit(dword_type_name_c *symbol); + void *visit(lword_type_name_c *symbol); +// void *visit(string_type_name_c *symbol); +// void *visit(wstring_type_name_c *symbol); + + /******************************************************/ + /* Extensions to the base standard as defined in */ + /* "Safety Software Technical Specification, */ + /* Part 1: Concepts and Function Blocks, */ + /* Version 1.0 – Official Release" */ + /* by PLCopen - Technical Committee 5 - 2006-01-31 */ + /******************************************************/ + void *visit(safebool_type_name_c *symbol); + + /********************************/ + /* B 1.3.3 - Derived data types */ + /********************************/ +#if 0 + /* simple_type_name ':' simple_spec_init */ + void *visit(simple_type_declaration_c *symbol); + /* simple_specification ASSIGN constant */ + void *visit(simple_spec_init_c *symbol); + /* subrange_type_name ':' subrange_spec_init */ + void *visit(subrange_type_declaration_c *symbol); + /* subrange_specification ASSIGN signed_integer */ + void *visit(subrange_spec_init_c *symbol); + /* integer_type_name '(' subrange')' */ + void *visit(subrange_specification_c *symbol); + /* signed_integer DOTDOT signed_integer */ + void *visit(subrange_c *symbol); + + /* enumerated_type_name ':' enumerated_spec_init */ + void *visit(enumerated_type_declaration_c *symbol); + /* enumerated_specification ASSIGN enumerated_value */ + void *visit(enumerated_spec_init_c *symbol); + /* helper symbol for enumerated_specification->enumerated_spec_init */ + /* enumerated_value_list ',' enumerated_value */ + void *visit(enumerated_value_list_c *symbol); + /* enumerated_type_name '#' identifier */ + // SYM_REF2(enumerated_value_c, type, value) + void *visit(enumerated_value_c *symbol); + /* identifier ':' array_spec_init */ + void *visit(array_type_declaration_c *symbol); + /* array_specification [ASSIGN array_initialization} */ + /* array_initialization may be NULL ! */ + void *visit(array_spec_init_c *symbol); + /* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */ + void *visit(array_specification_c *symbol); + /* helper symbol for array_specification */ + /* array_subrange_list ',' subrange */ + void *visit(array_subrange_list_c *symbol); + /* array_initialization: '[' array_initial_elements_list ']' */ + /* helper symbol for array_initialization */ + /* array_initial_elements_list ',' array_initial_elements */ + void *visit(array_initial_elements_list_c *symbol); + /* integer '(' [array_initial_element] ')' */ + /* array_initial_element may be NULL ! */ + void *visit(array_initial_elements_c *symbol); + /* structure_type_name ':' structure_specification */ + /* NOTE: structure_specification will point to either a + * initialized_structure_c + * OR A + * structure_element_declaration_list_c + */ + void *visit(structure_type_declaration_c *symbol); + /* structure_type_name ASSIGN structure_initialization */ + /* structure_initialization may be NULL ! */ + void *visit(initialized_structure_c *symbol); + /* helper symbol for structure_declaration */ + /* structure_declaration: STRUCT structure_element_declaration_list END_STRUCT */ + /* structure_element_declaration_list structure_element_declaration ';' */ + void *visit(structure_element_declaration_list_c *symbol); + /* structure_element_name ':' *_spec_init */ + void *visit(structure_element_declaration_c *symbol); + /* helper symbol for structure_initialization */ + /* structure_initialization: '(' structure_element_initialization_list ')' */ + /* structure_element_initialization_list ',' structure_element_initialization */ + void *visit(structure_element_initialization_list_c *symbol); + /* structure_element_name ASSIGN value */ + void *visit(structure_element_initialization_c *symbol); + /* string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */ + /* + SYM_REF4(string_type_declaration_c, string_type_name, + elementary_string_type_name, + string_type_declaration_size, + string_type_declaration_init) // may be == NULL! + */ + void *visit(string_type_declaration_c *symbol); +#endif +}; // get_sizeof_datatype_c + + + +