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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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* Conversion of basic abstract syntax constructs.
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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_c.hh"
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class generate_c_base_c: public iterator_visitor_c {
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protected:
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stage4out_c &s4o;
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private:
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/* Unlike programs that are mapped onto C++ classes, Function Blocks are mapped onto a data structure type
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* and a separate function conatining the code. This function is passed a pointer to an instance of the data
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* structure. This means that the code inside the functions must insert a pointer to the data structure whenever
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* it wishes to access a Function Block variable.
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* The variable_prefix_ variable will contain the correct string which needs to be prefixed to all variable accesses.
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* This string is set with the set_variable_prefix() member function.
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*/
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const char *variable_prefix_;
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public:
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generate_c_base_c(stage4out_c *s4o_ptr): s4o(*s4o_ptr) {variable_prefix_ = NULL;}
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~generate_c_base_c(void) {}
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void set_variable_prefix(const char *variable_prefix) {variable_prefix_ = variable_prefix;}
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void print_variable_prefix(void) {
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if (variable_prefix_ != NULL)
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s4o.print(variable_prefix_);
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}
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void *print_token(token_c *token, int offset = 0) {
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return s4o.printupper((token->value)+offset);
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}
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void *print_literal(symbol_c *type, symbol_c *value) {
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s4o.print("__");
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type->accept(*this);
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s4o.print("_LITERAL(");
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value->accept(*this);
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s4o.print(")");
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return NULL;
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}
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void *print_striped_token(token_c *token, int offset = 0) {
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std::string str = "";
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for (unsigned int i = offset; i < strlen(token->value); i++)
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if (token->value[i] != '_')
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str += token->value[i];
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return s4o.printupper(str);
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}
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void *print_striped_binary_token(token_c *token, unsigned int offset = 0) {
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/* convert the binary value to hexadecimal format... */
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unsigned char value, bit_mult;
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unsigned int i;
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int total_bits;
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char str[2] = {'A', '\0'}; /* since the s4o object is not prepared to print out one character at a time... */
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s4o.print("0x");
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total_bits = 0;
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for (i = offset; i < strlen(token->value); i++)
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if (token->value[i] != '_')
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total_bits++;
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value = 0;
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bit_mult = (unsigned char)1 << (((total_bits+3)%4)+1);
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for (i = offset; i < strlen(token->value); i++) {
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if (token->value[i] != '_') {
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bit_mult /= 2;
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value += bit_mult * ((token->value[i] == '0')? 0:1);
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if (bit_mult == 1) {
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str[0] = (value <= 9)? (char)'0' + value : (char)'A' + value;
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s4o.print(str);
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bit_mult = 0x10;
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value = 0;
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}
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}
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}
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return NULL;
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}
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void *print_list(list_c *list,
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std::string pre_elem_str = "",
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std::string inter_elem_str = "",
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std::string post_elem_str = "",
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visitor_c *visitor = NULL) {
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if (visitor == NULL) visitor = this;
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if (list->n > 0) {
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//std::cout << "generate_c_base_c::print_list(n = " << list->n << ") 000\n";
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s4o.print(pre_elem_str);
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list->elements[0]->accept(*visitor);
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}
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for(int i = 1; i < list->n; i++) {
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//std::cout << "generate_c_base_c::print_list " << i << "\n";
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s4o.print(inter_elem_str);
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list->elements[i]->accept(*visitor);
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}
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if (list->n > 0)
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s4o.print(post_elem_str);
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return NULL;
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}
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void *print_binary_expression(symbol_c *l_exp,
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symbol_c *r_exp,
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const char *operation) {
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s4o.print("(");
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l_exp->accept(*this);
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s4o.print(operation);
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r_exp->accept(*this);
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s4o.print(")");
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return NULL;
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}
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void *print_unary_expression(symbol_c *exp,
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const char *operation) {
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s4o.print(operation);
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s4o.print("(");
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exp->accept(*this);
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s4o.print(")");
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return NULL;
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}
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void *print_binary_function(const char *function,
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symbol_c *l_exp,
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symbol_c *r_exp) {
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s4o.print(function);
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s4o.print("(");
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l_exp->accept(*this);
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s4o.print(", ");
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r_exp->accept(*this);
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s4o.print(")");
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return NULL;
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}
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void *print_compare_function(const char *function,
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symbol_c *compare_type,
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symbol_c *l_exp,
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symbol_c *r_exp) {
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s4o.print(function);
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compare_type->accept(*this);
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s4o.print("(2, ");
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l_exp->accept(*this);
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s4o.print(", ");
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r_exp->accept(*this);
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s4o.print(")");
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return NULL;
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}
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/***************************/
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/* 2.1.6 - Pragmas */
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/***************************/
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/* Do not use print_token() as it will change everything into uppercase */
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void *visit(pragma_c *symbol) {return s4o.print(symbol->value);}
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/***************************/
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/* B 0 - Programming Model */
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/***************************/
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/* leave for derived classes... */
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/*************************/
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/* B.1 - Common elements */
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/*************************/
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/*******************************************/
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/* B 1.1 - Letters, digits and identifiers */
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/*******************************************/
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void *visit(identifier_c *symbol) {return print_token(symbol);}
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/*********************/
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/* B 1.2 - Constants */
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/*********************/
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/* originally empty... */
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/******************************/
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/* B 1.2.1 - Numeric Literals */
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/******************************/
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void *visit(real_c *symbol) {return print_striped_token(symbol);}
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void *visit(integer_c *symbol) {return print_striped_token(symbol);}
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void *visit(binary_integer_c *symbol) {return print_striped_binary_token(symbol, 2);}
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void *visit(octal_integer_c *symbol) {s4o.print("0"); return print_striped_token(symbol, 2);}
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void *visit(hex_integer_c *symbol) {s4o.print("0x"); return print_striped_token(symbol, 3);}
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void *visit(numeric_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}
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void *visit(integer_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}
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void *visit(real_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}
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void *visit(bit_string_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}
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void *visit(boolean_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}
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/* helper class for boolean_literal_c */
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void *visit(boolean_true_c *symbol) {s4o.print("TRUE"); return NULL;}
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void *visit(boolean_false_c *symbol) {s4o.print("FALSE"); return NULL;}
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void *visit(neg_expression_c *symbol) {
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s4o.print("-");
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symbol->exp->accept(*this);
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return NULL;
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}
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/*******************************/
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/* B.1.2.2 Character Strings */
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/*******************************/
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void *visit(double_byte_character_string_c *symbol) {
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// TO DO ...
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ERROR;
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return print_token(symbol);
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}
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void *visit(single_byte_character_string_c *symbol) {
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std::string str = "";
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unsigned int count = 0;
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str += '"';
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/* we ignore the first and last bytes, they will be the character ' */
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for (unsigned int i = 1; i < strlen(symbol->value) - 1; i++) {
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char c = symbol->value[i];
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if ((c == '\\') || (c == '"'))
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{str += '\\'; str += c; count ++; continue;}
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if (c != '$')
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{str += c; count++; continue;}
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/* this should be safe, since the code has passed the syntax parser!! */
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c = symbol->value[++i];
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switch (c) {
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case '$':
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case '\'':
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{str += c; count++; continue;}
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case 'L':
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case 'l':
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{str += "\x0A"; /* LF */; count++; continue;}
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case 'N':
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case 'n':
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{str += "\\x0A"; /* NL */; count++; continue;}
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case 'P':
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case 'p':
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{str += "\\f"; /* FF */; count++; continue;}
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case 'R':
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case 'r':
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{str += "\\r"; /* CR */; count++; continue;}
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case 'T':
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case 't':
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{str += "\\t"; /* tab */; count++; continue;}
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default: {
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if (isxdigit(c)) {
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/* this should be safe, since the code has passed the syntax parser!! */
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char c2 = symbol->value[++i];
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if (isxdigit(c2)) {
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str += '\\'; str += 'x'; str += c; str += c2;
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count++; continue;
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}
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}
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}
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/* otherwise we have an invalid string!! */
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/* This should not have got through the syntax parser! */
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ERROR;
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} /* switch() */
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} /* for() */
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str += '"';
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s4o.print("(STRING){");
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s4o.print_integer(count);
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s4o.print(",");
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s4o.print(str);
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s4o.print("}");
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return NULL;
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}
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/***************************/
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/* B 1.2.3 - Time Literals */
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/***************************/
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/************************/
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/* B 1.2.3.1 - Duration */
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/************************/
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/* The following output is actually the parameters to the constructor of the TIME class! */
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/* SYM_REF0(neg_time_c) */
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void *visit(neg_time_c *symbol) {s4o.print("-1"); /* negative time value */; return NULL;}
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/* SYM_REF2(duration_c, neg, interval) */
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void *visit(duration_c *symbol) {
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TRACE("duration_c");
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s4o.print("__time_to_timespec(");
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if (NULL == symbol->neg)
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s4o.print("1"); /* positive time value */
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else
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symbol->neg->accept(*this); /* this will print '-1' :-) */
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s4o.print(", ");
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symbol->interval->accept(*this);
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if (typeid(*symbol->interval) == typeid(hours_c)) {s4o.print(", 0");}
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if (typeid(*symbol->interval) == typeid(minutes_c)) {s4o.print(", 0, 0");}
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if (typeid(*symbol->interval) == typeid(seconds_c)) {s4o.print(", 0, 0, 0");}
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if (typeid(*symbol->interval) == typeid(milliseconds_c)) {s4o.print(", 0, 0, 0, 0");}
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s4o.print(")");
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return NULL;
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}
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/* SYM_TOKEN(fixed_point_c) */
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void *visit(fixed_point_c *symbol) {return print_token(symbol);}
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/* SYM_REF2(days_c, days, hours) */
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void *visit(days_c *symbol) {
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TRACE("days_c");
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if (NULL == symbol->hours)
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s4o.print("0, 0, 0, 0"); /* milliseconds, seconds, minutes, hours */
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else
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symbol->hours->accept(*this);
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s4o.print(", ");
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symbol->days->accept(*this);
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return NULL;
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}
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/* SYM_REF2(hours_c, hours, minutes) */
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void *visit(hours_c *symbol) {
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TRACE("hours_c");
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if (NULL == symbol->minutes)
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s4o.print("0, 0, 0"); /* milliseconds, seconds, minutes */
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else
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symbol->minutes->accept(*this);
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s4o.print(", ");
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symbol->hours->accept(*this);
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return NULL;
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}
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/* SYM_REF2(minutes_c, minutes, seconds) */
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void *visit(minutes_c *symbol) {
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TRACE("minutes_c");
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if (NULL == symbol->seconds)
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s4o.print("0, 0"); /* milliseconds, seconds */
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else
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symbol->seconds->accept(*this);
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s4o.print(", ");
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symbol->minutes->accept(*this);
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return NULL;
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}
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/* SYM_REF2(seconds_c, seconds, milliseconds) */
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void *visit(seconds_c *symbol) {
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TRACE("seconds_c");
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if (NULL == symbol->milliseconds)
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s4o.print("0"); /* milliseconds */
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else
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symbol->milliseconds->accept(*this);
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s4o.print(", ");
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symbol->seconds->accept(*this);
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return NULL;
|
|
425 |
}
|
|
426 |
|
|
427 |
|
|
428 |
/* SYM_REF2(milliseconds_c, milliseconds, unused) */
|
|
429 |
void *visit(milliseconds_c *symbol) {
|
|
430 |
TRACE("milliseconds_c");
|
|
431 |
symbol->milliseconds->accept(*this);
|
|
432 |
return NULL;
|
|
433 |
}
|
|
434 |
|
|
435 |
/************************************/
|
|
436 |
/* B 1.2.3.2 - Time of day and Date */
|
|
437 |
/************************************/
|
|
438 |
|
|
439 |
/* SYM_REF2(time_of_day_c, daytime, unused) */
|
|
440 |
void *visit(time_of_day_c *symbol) {
|
|
441 |
TRACE("time_of_day_c");
|
|
442 |
s4o.print("__tod_to_timespec(");
|
|
443 |
symbol->daytime->accept(*this);
|
|
444 |
s4o.print(")");
|
|
445 |
return NULL;
|
|
446 |
}
|
|
447 |
|
|
448 |
|
|
449 |
/* SYM_REF4(daytime_c, day_hour, day_minute, day_second, unused) */
|
|
450 |
void *visit(daytime_c *symbol) {
|
|
451 |
TRACE("daytime_c");
|
|
452 |
symbol->day_second->accept(*this);
|
|
453 |
s4o.print(", ");
|
|
454 |
symbol->day_minute->accept(*this);
|
|
455 |
s4o.print(", ");
|
|
456 |
symbol->day_hour->accept(*this);
|
|
457 |
return NULL;
|
|
458 |
}
|
|
459 |
|
|
460 |
|
|
461 |
/* SYM_REF2(date_c, date_literal, unused) */
|
|
462 |
void *visit(date_c *symbol) {
|
|
463 |
TRACE("date_c");
|
|
464 |
s4o.print("__date_to_timespec(");
|
|
465 |
symbol->date_literal->accept(*this);
|
|
466 |
s4o.print(")");
|
|
467 |
return NULL;
|
|
468 |
}
|
|
469 |
|
|
470 |
|
|
471 |
/* SYM_REF4(date_literal_c, year, month, day, unused) */
|
|
472 |
void *visit(date_literal_c *symbol) {
|
|
473 |
TRACE("date_literal_c");
|
|
474 |
symbol->day->accept(*this);
|
|
475 |
s4o.print(", ");
|
|
476 |
symbol->month->accept(*this);
|
|
477 |
s4o.print(", ");
|
|
478 |
symbol->year->accept(*this);
|
|
479 |
return NULL;
|
|
480 |
}
|
|
481 |
|
|
482 |
|
|
483 |
/* SYM_REF2(date_and_time_c, date_literal, daytime) */
|
|
484 |
void *visit(date_and_time_c *symbol) {
|
|
485 |
TRACE("date_and_time_c");
|
|
486 |
s4o.print("__dt_to_timespec(");
|
|
487 |
symbol->daytime->accept(*this);
|
|
488 |
s4o.print(", ");
|
|
489 |
symbol->date_literal->accept(*this);
|
|
490 |
s4o.print(")");
|
|
491 |
return NULL;
|
|
492 |
}
|
|
493 |
|
|
494 |
|
|
495 |
/**********************/
|
|
496 |
/* B.1.3 - Data types */
|
|
497 |
/**********************/
|
|
498 |
/***********************************/
|
|
499 |
/* B 1.3.1 - Elementary Data Types */
|
|
500 |
/***********************************/
|
|
501 |
void *visit(time_type_name_c *symbol) {s4o.print("TIME"); return NULL;}
|
|
502 |
void *visit(bool_type_name_c *symbol) {s4o.print("BOOL"); return NULL;}
|
|
503 |
void *visit(sint_type_name_c *symbol) {s4o.print("SINT"); return NULL;}
|
|
504 |
void *visit(int_type_name_c *symbol) {s4o.print("INT"); return NULL;}
|
|
505 |
void *visit(dint_type_name_c *symbol) {s4o.print("DINT"); return NULL;}
|
|
506 |
void *visit(lint_type_name_c *symbol) {s4o.print("LINT"); return NULL;}
|
|
507 |
void *visit(usint_type_name_c *symbol) {s4o.print("USINT"); return NULL;}
|
|
508 |
void *visit(uint_type_name_c *symbol) {s4o.print("UINT"); return NULL;}
|
|
509 |
void *visit(udint_type_name_c *symbol) {s4o.print("UDINT"); return NULL;}
|
|
510 |
void *visit(ulint_type_name_c *symbol) {s4o.print("ULINT"); return NULL;}
|
|
511 |
void *visit(real_type_name_c *symbol) {s4o.print("REAL"); return NULL;}
|
|
512 |
void *visit(lreal_type_name_c *symbol) {s4o.print("LREAL"); return NULL;}
|
|
513 |
void *visit(date_type_name_c *symbol) {s4o.print("DATE"); return NULL;}
|
|
514 |
void *visit(tod_type_name_c *symbol) {s4o.print("TOD"); return NULL;}
|
|
515 |
void *visit(dt_type_name_c *symbol) {s4o.print("DT"); return NULL;}
|
|
516 |
void *visit(byte_type_name_c *symbol) {s4o.print("BYTE"); return NULL;}
|
|
517 |
void *visit(word_type_name_c *symbol) {s4o.print("WORD"); return NULL;}
|
|
518 |
void *visit(lword_type_name_c *symbol) {s4o.print("LWORD"); return NULL;}
|
|
519 |
void *visit(dword_type_name_c *symbol) {s4o.print("DWORD"); return NULL;}
|
|
520 |
void *visit(string_type_name_c *symbol) {s4o.print("STRING"); return NULL;}
|
|
521 |
void *visit(wstring_type_name_c *symbol) {s4o.print("WSTRING"); return NULL;}
|
|
522 |
|
|
523 |
/********************************/
|
|
524 |
/* B.1.3.2 - Generic data types */
|
|
525 |
/********************************/
|
|
526 |
/* originally empty... */
|
|
527 |
|
|
528 |
/********************************/
|
|
529 |
/* B 1.3.3 - Derived data types */
|
|
530 |
/********************************/
|
|
531 |
/* leave for derived classes... */
|
|
532 |
|
|
533 |
/*********************/
|
|
534 |
/* B 1.4 - Variables */
|
|
535 |
/*********************/
|
|
536 |
void *visit(symbolic_variable_c *symbol) {
|
|
537 |
TRACE("symbolic_variable_c");
|
|
538 |
this->print_variable_prefix();
|
|
539 |
symbol->var_name->accept(*this);
|
|
540 |
return NULL;
|
|
541 |
}
|
|
542 |
|
|
543 |
/********************************************/
|
|
544 |
/* B.1.4.1 Directly Represented Variables */
|
|
545 |
/********************************************/
|
|
546 |
void *visit(direct_variable_c *symbol) {
|
|
547 |
TRACE("direct_variable_c");
|
|
548 |
/* Do not use print_token() as it will change everything into uppercase */
|
|
549 |
return s4o.printlocation(symbol->value);
|
|
550 |
}
|
|
551 |
|
|
552 |
|
|
553 |
|
|
554 |
/*************************************/
|
|
555 |
/* B.1.4.2 Multi-element Variables */
|
|
556 |
/*************************************/
|
|
557 |
#if 0
|
|
558 |
/* subscripted_variable '[' subscript_list ']' */
|
|
559 |
SYM_REF2(array_variable_c, subscripted_variable, subscript_list)
|
|
560 |
|
|
561 |
#endif
|
|
562 |
|
|
563 |
/* record_variable '.' field_selector */
|
|
564 |
/* WARNING: input and/or output variables of function blocks
|
|
565 |
* may be accessed as fields of a structured variable!
|
|
566 |
* Code handling a structured_variable_c must take
|
|
567 |
* this into account!
|
|
568 |
*/
|
|
569 |
// SYM_REF2(structured_variable_c, record_variable, field_selector)
|
|
570 |
void *visit(structured_variable_c *symbol) {
|
|
571 |
TRACE("structured_variable_c");
|
|
572 |
|
|
573 |
symbol->record_variable->accept(*this);
|
|
574 |
s4o.print(".");
|
|
575 |
symbol->field_selector->accept(*this);
|
|
576 |
return NULL;
|
|
577 |
}
|
|
578 |
|
|
579 |
/******************************************/
|
|
580 |
/* B 1.4.3 - Declaration & Initialisation */
|
|
581 |
/******************************************/
|
|
582 |
/* leave for derived classes... */
|
|
583 |
|
|
584 |
/**************************************/
|
|
585 |
/* B.1.5 - Program organization units */
|
|
586 |
/**************************************/
|
|
587 |
/***********************/
|
|
588 |
/* B 1.5.1 - Functions */
|
|
589 |
/***********************/
|
|
590 |
/* leave for derived classes... */
|
|
591 |
|
|
592 |
/*****************************/
|
|
593 |
/* B 1.5.2 - Function Blocks */
|
|
594 |
/*****************************/
|
|
595 |
/* leave for derived classes... */
|
|
596 |
|
|
597 |
/**********************/
|
|
598 |
/* B 1.5.3 - Programs */
|
|
599 |
/**********************/
|
|
600 |
/* leave for derived classes... */
|
|
601 |
|
|
602 |
/*********************************************/
|
|
603 |
/* B.1.6 Sequential function chart elements */
|
|
604 |
/*********************************************/
|
|
605 |
|
|
606 |
/********************************/
|
|
607 |
/* B 1.7 Configuration elements */
|
|
608 |
/********************************/
|
|
609 |
/* leave for derived classes... */
|
|
610 |
|
|
611 |
/****************************************/
|
|
612 |
/* B.2 - Language IL (Instruction List) */
|
|
613 |
/****************************************/
|
|
614 |
/***********************************/
|
|
615 |
/* B 2.1 Instructions and Operands */
|
|
616 |
/***********************************/
|
|
617 |
/* leave for derived classes... */
|
|
618 |
|
|
619 |
/*******************/
|
|
620 |
/* B 2.2 Operators */
|
|
621 |
/*******************/
|
|
622 |
/* leave for derived classes... */
|
|
623 |
|
|
624 |
|
|
625 |
/***************************************/
|
|
626 |
/* B.3 - Language ST (Structured Text) */
|
|
627 |
/***************************************/
|
|
628 |
/***********************/
|
|
629 |
/* B 3.1 - Expressions */
|
|
630 |
/***********************/
|
|
631 |
/* leave for derived classes... */
|
|
632 |
|
|
633 |
/********************/
|
|
634 |
/* B 3.2 Statements */
|
|
635 |
/********************/
|
|
636 |
/* leave for derived classes... */
|
|
637 |
|
|
638 |
/*********************************/
|
|
639 |
/* B 3.2.1 Assignment Statements */
|
|
640 |
/*********************************/
|
|
641 |
/* leave for derived classes... */
|
|
642 |
|
|
643 |
/*****************************************/
|
|
644 |
/* B 3.2.2 Subprogram Control Statements */
|
|
645 |
/*****************************************/
|
|
646 |
/* leave for derived classes... */
|
|
647 |
|
|
648 |
/********************************/
|
|
649 |
/* B 3.2.3 Selection Statements */
|
|
650 |
/********************************/
|
|
651 |
/* leave for derived classes... */
|
|
652 |
|
|
653 |
/********************************/
|
|
654 |
/* B 3.2.4 Iteration Statements */
|
|
655 |
/********************************/
|
|
656 |
/* leave for derived classes... */
|
|
657 |
|
|
658 |
}; /* class generate_c_basic_c */
|
|
659 |
|
|
660 |
|
|
661 |
|
|
662 |
|
|
663 |
|
|
664 |
|
|
665 |
|
|
666 |
|
|
667 |
|
|
668 |
|
|
669 |
|
|
670 |
|
|
671 |
|
|
672 |
|