author | lbessard |
Tue, 27 Feb 2007 17:24:10 +0100 | |
changeset 18 | e6af5eb5f546 |
parent 0 | fb772792efd1 |
permissions | -rwxr-xr-x |
0
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/* |
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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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/* |
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* Determine the default initial value of a type declaration. |
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* |
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* This is part of the 4th stage that generates |
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* a c++ source program equivalent to the IL and ST |
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* code. |
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*/ |
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//#include <stdio.h> /* required for NULL */ |
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//#include <string> |
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//#include <iostream> |
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//#include "../../util/symtable.hh" |
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//#include "generate_cc.hh" |
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/* Given a type definition declration, determine its default |
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* initial value. Note that types based on other types |
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* may have to iterate through each type it is based on |
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* to determine the initial value. |
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* E.g. |
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* TYPE |
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* A_t : INT := 10; |
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* B_t : A_t := 20; |
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* C_t : B_t; |
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* D_t : C_t := 40; |
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* END_TYPE |
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* Where the default initial value for C_t is 20! |
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*/ |
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/* NOTE: The main program only needs one instance of |
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* this class of object. This class |
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* is therefore a singleton. |
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*/ |
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class type_initial_value_c : public null_visitor_c { |
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private: |
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static type_initial_value_c *_instance; |
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/* constants for the default values of elementary data types... */ |
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static real_c *real_0; |
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static integer_c *integer_0, *integer_1; |
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static boolean_literal_c *bool_0; |
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static date_literal_c *date_literal_0; |
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static daytime_c *daytime_literal_0; |
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static duration_c *time_0; |
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static date_c *date_0; |
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static time_of_day_c *tod_0; |
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static date_and_time_c *dt_0; |
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static single_byte_character_string_c *string_0; |
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static double_byte_character_string_c *wstring_0; |
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public: |
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static type_initial_value_c *instance(void) { |
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if (_instance != NULL) |
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return _instance; |
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_instance = new type_initial_value_c; |
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real_0 = new real_c("0"); |
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integer_0 = new integer_c("0"); |
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integer_1 = new integer_c("1"); |
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bool_0 = new boolean_literal_c(new bool_type_name_c(),new boolean_false_c()); |
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/* FIXME: Our current implementation only allows dates from 1970 onwards, |
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* but the standard defines the date 0001-01-01 as the default value |
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* for the DATE data type. Untill we fix our implementation, we use 1970-01-01 |
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* as our default value!! |
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*/ |
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// date_literal_0 = new date_literal_c(integer_1, integer_1, integer_1); |
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date_literal_0 = new date_literal_c(new integer_c("1970"), integer_1, integer_1); |
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daytime_literal_0 = new daytime_c(integer_0, integer_0, real_0); |
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time_0 = new duration_c(NULL, new seconds_c(integer_0, NULL)); // T#0S |
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date_0 = new date_c(date_literal_0); // D#0001-01-01 |
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tod_0 = new time_of_day_c(daytime_literal_0); // TOD#00:00:00 |
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dt_0 = new date_and_time_c(date_literal_0, daytime_literal_0); // DT#0001-01-01-00:00:00 |
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string_0 = new single_byte_character_string_c("''"); |
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wstring_0 = new double_byte_character_string_c("\"\""); |
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return _instance; |
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} |
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protected: |
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type_initial_value_c(void) {} |
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public: |
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symbol_c *get(identifier_c *type_name) { |
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TRACE("type_initial_value_c::get(): called "); |
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return (symbol_c *)type_name->accept(*this); |
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} |
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|
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120 |
|
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private: |
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void *handle_type_spec(symbol_c *base_type_name, symbol_c *type_spec_init) { |
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if (type_spec_init != NULL) |
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return type_spec_init; |
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/* no initial value specified, so we return |
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* the initial value of the type this type is based on... |
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*/ |
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return base_type_name->accept(*this); |
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} |
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130 |
|
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public: |
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void *visit(identifier_c *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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/* NOTE: Variables declared out of function block 'data types', |
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* for eg: VAR timer: TON; END_VAR |
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* do not have a default value, so (TON) will never be found in the |
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* type symbol table. This means we cannot simply consider this |
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* an error and abort, but must rather return a NULL. |
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*/ |
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return NULL; |
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144 |
|
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return type_decl->accept(*this); |
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} |
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147 |
|
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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 *)time_0;} |
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void *visit(bool_type_name_c *symbol) {return (void *)bool_0;} |
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void *visit(sint_type_name_c *symbol) {return (void *)integer_0;} |
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void *visit(int_type_name_c *symbol) {return (void *)integer_0;} |
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void *visit(dint_type_name_c *symbol) {return (void *)integer_0;} |
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void *visit(lint_type_name_c *symbol) {return (void *)integer_0;} |
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void *visit(usint_type_name_c *symbol) {return (void *)integer_0;} |
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void *visit(uint_type_name_c *symbol) {return (void *)integer_0;} |
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void *visit(udint_type_name_c *symbol) {return (void *)integer_0;} |
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void *visit(ulint_type_name_c *symbol) {return (void *)integer_0;} |
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void *visit(real_type_name_c *symbol) {return (void *)real_0;} |
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void *visit(lreal_type_name_c *symbol) {return (void *)real_0;} |
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void *visit(date_type_name_c *symbol) {return (void *)date_0;} |
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void *visit(tod_type_name_c *symbol) {return (void *)tod_0;} |
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void *visit(dt_type_name_c *symbol) {return (void *)dt_0;} |
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void *visit(byte_type_name_c *symbol) {return (void *)integer_0;} |
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void *visit(word_type_name_c *symbol) {return (void *)integer_0;} |
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void *visit(dword_type_name_c *symbol) {return (void *)integer_0;} |
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void *visit(lword_type_name_c *symbol) {return (void *)integer_0;} |
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void *visit(string_type_name_c *symbol) {return (void *)string_0;} |
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void *visit(wstring_type_name_c *symbol) {return (void *)wstring_0;} |
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172 |
|
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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 handle_type_spec(symbol->simple_specification, symbol->constant); |
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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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return handle_type_spec(symbol->subrange_specification, symbol->signed_integer); |
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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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/* if no initial value explicitly given, then use the lowest value of the subrange */ |
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return symbol->subrange->accept(*this); |
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} |
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/* signed_integer DOTDOT signed_integer */ |
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void *visit(subrange_c *symbol) {return symbol->lower_limit;} |
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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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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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return handle_type_spec(symbol->enumerated_specification, symbol->enumerated_value); |
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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 no initial value explicitly given, then use the lowest value of the subrange */ |
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return (void *)symbol->elements[0]; |
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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;} |
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/* identifier ':' array_spec_init */ |
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void *visit(array_type_declaration_c *symbol) { |
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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 handle_type_spec(symbol->array_specification, symbol->array_initialization); |
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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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symbol_c *init_value = (symbol_c *)symbol->non_generic_type_name->accept(*this); |
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|
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/* Now build a array_initial_elements_list_c list, and populate it |
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* with 1 element of the array_initial_elements_c class |
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*/ |
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/* The array_initial_elements_c will contain a reference to the init_value, |
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* and another constant representing the number of elements in the array. |
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* In essence, we are building the equivilant of the following ST/IL code: |
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* New_array_t : ARRAY [1..30, 51..60] of INT := [40(XXX)]; |
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* from the user given code |
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* New_array_t : ARRAY [1..30, 51..60] of INT; |
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* and replacing XXX with the default initial value of INT. |
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*/ |
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/* now we need to determine the number of elements in the array... */ |
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/* Easier said than done, as the array may have a list of subranges, as in the |
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* example given above!! |
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*/ |
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/* TODO !!!!!*/ |
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/* For now, just assume an array with 1 element. |
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* I (Mario) want to finish off this part of the code before getting boged down |
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* in something else... |
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*/ |
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// NOTE: We are leaking memory, as the integer will never get free'd!! |
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integer_c *integer = new integer_c("1"); |
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// NOTE: We are leaking memory, as the array_initial_elements will never get free'd!! |
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array_initial_elements_c *array_initial_elements = new array_initial_elements_c(integer, init_value); |
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// NOTE: We are leaking memory, as the array_initial_elements_list will never get free'd!! |
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array_initial_elements_list_c *array_initial_elements_list = new array_initial_elements_list_c(); |
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array_initial_elements_list->add_element(array_initial_elements); |
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return (void *)array_initial_elements_list; |
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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;} |
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/* array_initialization: '[' array_initial_elements_list ']' */ |
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262 |
/* helper symbol for array_initialization */ |
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263 |
/* array_initial_elements_list ',' array_initial_elements */ |
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void *visit(array_initial_elements_list_c *symbol) {ERROR; return NULL;} |
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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;} |
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268 |
|
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269 |
|
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270 |
|
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271 |
/* TODO: from this point forward... */ |
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272 |
|
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/* structure_type_name ':' structure_specification */ |
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void *visit(structure_type_declaration_c *symbol) {return NULL;} |
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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) {return NULL;} |
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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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280 |
/* structure_element_declaration_list structure_element_declaration ';' */ |
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void *visit(structure_element_declaration_list_c *symbol) {return NULL;} |
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282 |
/* structure_element_name ':' *_spec_init */ |
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void *visit(structure_element_declaration_c *symbol) {return NULL;} |
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284 |
/* helper symbol for structure_initialization */ |
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285 |
/* structure_initialization: '(' structure_element_initialization_list ')' */ |
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286 |
/* structure_element_initialization_list ',' structure_element_initialization */ |
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void *visit(structure_element_initialization_list_c *symbol) {return NULL;} |
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/* structure_element_name ASSIGN value */ |
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void *visit(structure_element_initialization_c *symbol) {return NULL;} |
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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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292 |
* NOTE: |
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293 |
* (Summary: Contrary to what is expected, the |
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294 |
* string_type_declaration_c is not used to store |
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295 |
* simple string type declarations that do not include |
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* size limits. |
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297 |
* For e.g.: |
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298 |
* str1_type: STRING := "hello!" |
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* will be stored in a simple_type_declaration_c |
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* instead of a string_type_declaration_c. |
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301 |
* The following: |
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* str2_type: STRING [64] := "hello!" |
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* will be stored in a sring_type_declaration_c |
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304 |
* |
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305 |
* Read on for why this is done... |
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306 |
* End Summary) |
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307 |
* |
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* According to the spec, the valid construct |
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309 |
* TYPE new_str_type : STRING := "hello!"; END_TYPE |
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* has two possible routes to type_declaration... |
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311 |
* |
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312 |
* Route 1: |
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313 |
* type_declaration: single_element_type_declaration |
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314 |
* single_element_type_declaration: simple_type_declaration |
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315 |
* simple_type_declaration: identifier ':' simple_spec_init |
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* simple_spec_init: simple_specification ASSIGN constant |
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* (shift: identifier <- 'new_str_type') |
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* simple_specification: elementary_type_name |
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* elementary_type_name: STRING |
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* (shift: elementary_type_name <- STRING) |
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* (reduce: simple_specification <- elementary_type_name) |
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* (shift: constant <- "hello!") |
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323 |
* (reduce: simple_spec_init: simple_specification ASSIGN constant) |
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* (reduce: ...) |
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325 |
* |
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326 |
* |
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327 |
* Route 2: |
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328 |
* type_declaration: string_type_declaration |
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* string_type_declaration: identifier ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init |
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330 |
* (shift: identifier <- 'new_str_type') |
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331 |
* elementary_string_type_name: STRING |
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* (shift: elementary_string_type_name <- STRING) |
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* (shift: string_type_declaration_size <- empty ) |
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* string_type_declaration_init: ASSIGN character_string |
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* (shift: character_string <- "hello!") |
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* (reduce: string_type_declaration_init <- ASSIGN character_string) |
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* (reduce: string_type_declaration <- identifier ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init ) |
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* (reduce: type_declaration <- string_type_declaration) |
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339 |
* |
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340 |
* |
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341 |
* At first glance it seems that removing route 1 would make |
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* the most sense. Unfortunately the construct 'simple_spec_init' |
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* shows up multiple times in other rules, so changing this construct |
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* would also mean changing all the rules in which it appears. |
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* I (Mario) therefore chose to remove route 2 instead. This means |
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* that the above declaration gets stored in a |
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* simple_type_declaration_c, and not in a string_type_declaration_c |
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* as would be expected! |
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*/ |
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/* string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */ |
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#if 0 |
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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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#endif |
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void *visit(string_type_declaration_c *symbol) {return NULL;} |
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}; |
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359 |
|
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type_initial_value_c *type_initial_value_c::_instance = NULL; |
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real_c *type_initial_value_c::real_0 = NULL; |
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integer_c *type_initial_value_c::integer_0 = NULL; |
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integer_c *type_initial_value_c::integer_1 = NULL; |
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boolean_literal_c *type_initial_value_c::bool_0 = NULL; |
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date_literal_c *type_initial_value_c::date_literal_0 = NULL; |
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daytime_c *type_initial_value_c::daytime_literal_0 = NULL; |
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duration_c *type_initial_value_c::time_0 = NULL; |
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date_c *type_initial_value_c::date_0 = NULL; |
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time_of_day_c *type_initial_value_c::tod_0 = NULL; |
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date_and_time_c *type_initial_value_c::dt_0 = NULL; |
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single_byte_character_string_c *type_initial_value_c::string_0 = NULL; |
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double_byte_character_string_c *type_initial_value_c::wstring_0 = NULL; |
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|
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374 |
|
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375 |
|
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376 |
|
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377 |
|
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378 |