author | mario |
Thu, 01 Feb 2007 10:59:57 +0100 | |
changeset 5 | 8860f9917bbc |
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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* Function parameter iterator. |
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* Iterate through the in/out parameters of a function declaration. |
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* Function blocks are also suported. |
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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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#include "../../absyntax/visitor.hh" |
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/* given a function_declaration_c, iterate through each |
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* function in/out/inout parameter, returning the name |
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* of each parameter...function_param_iterator_c |
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*/ |
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class function_param_iterator_c : public null_visitor_c { |
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public: |
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/* A type to specify the type of parameter. |
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* VAR_INPUT => direction_in |
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* VAR_OUTPUT => direction_out |
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* VAR_IN_OUT => direction_inout |
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* VAR_EXTERNAL => direction_extref |
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* |
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* Note that VAR_EXTERNAL declares variables that are in reality references |
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* to global variables. This is used only inside programs! |
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* These references to external variables must be correctly initialised to refer |
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* to the correct global variable. Note that the user may define which variable is to be |
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* referenced in a CONFIGURATION, and that different instantiations of a program |
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* may have the same external variable reference diffenrent global variables! |
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* The references must therefore be correctly initialised when the program instance |
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* is created. This may be done by the PROGRAM class constructor since the ST and IL |
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* languages do not allow the VAR_EXTERNAL reference to change at runtime |
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* for a specific instance. |
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* |
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* We therefore need to call a PROGRAM class constructor with the variables |
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* that should be refernced by the VAR_EXTERNAL variables. The direction_extref will |
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* be used to identify these parameters! |
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*/ |
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typedef enum {direction_in, direction_out, direction_inout, direction_extref} param_direction_t ; |
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private: |
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/* a pointer to the function_block_declaration_c |
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* or function_declaration_c currently being analysed. |
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*/ |
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symbol_c *f_decl; |
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int next_param, param_count; |
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identifier_c *current_param_name; |
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symbol_c *current_param_type; |
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symbol_c *current_param_default_value; |
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param_direction_t current_param_direction; |
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private: |
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void* handle_param_list(list_c *list) { |
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if (next_param <= param_count + list->n) |
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return list->elements[next_param - param_count - 1]; |
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|
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/* the desired param is not on this list... */ |
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param_count += list->n; |
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return NULL; |
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} |
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|
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void* handle_single_param(symbol_c *var_name) { |
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param_count++; |
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if (next_param == param_count) |
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return var_name; |
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|
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/* not yet the desired param... */ |
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return NULL; |
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} |
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|
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void* iterate_list(list_c *list) { |
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void *res; |
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for (int i = 0; i < list->n; i++) { |
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res = list->elements[i]->accept(*this); |
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if (res != NULL) |
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return res; |
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} |
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return NULL; |
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} |
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122 |
|
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123 |
|
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public: |
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/* start off at the first parameter once again... */ |
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void reset(void) { |
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next_param = param_count = 0; |
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current_param_name = NULL; |
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current_param_type = current_param_default_value = NULL; |
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} |
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131 |
|
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/* initialise the iterator object. |
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* We must be given a reference to the function declaration |
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* that will be analysed... |
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*/ |
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function_param_iterator_c(function_declaration_c *f_decl) { |
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this->f_decl = f_decl; |
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reset(); |
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} |
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140 |
|
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/* initialise the iterator object. |
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* We must be given a reference to the function block declaration |
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* that will be analysed... |
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*/ |
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function_param_iterator_c(function_block_declaration_c *fb_decl) { |
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this->f_decl = fb_decl; |
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reset(); |
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} |
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149 |
|
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/* initialise the iterator object. |
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* We must be given a reference to the program declaration |
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* that will be analysed... |
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*/ |
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function_param_iterator_c(program_declaration_c *p_decl) { |
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this->f_decl = p_decl; |
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reset(); |
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} |
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|
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/* Skip to the next parameter. After object creation, |
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* the object references on parameter _before_ the first, so |
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* this function must be called once to get the object to |
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* reference the first parameter... |
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* |
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* Returns the parameter's name! |
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*/ |
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identifier_c *next(void) { |
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void *res; |
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param_count = 0; |
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next_param++; |
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res = f_decl->accept(*this); |
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if (res == NULL) |
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return NULL; |
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|
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symbol_c *sym = (symbol_c *)res; |
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identifier_c *identifier = dynamic_cast<identifier_c *>(sym); |
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if (identifier == NULL) |
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ERROR; |
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|
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current_param_name = identifier; |
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return current_param_name; |
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} |
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|
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/* Returns the currently referenced parameter's default value, |
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* or NULL if none is specified in the function declrataion itself. |
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*/ |
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symbol_c *default_value(void) { |
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return current_param_default_value; |
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} |
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|
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/* Returns the currently referenced parameter's type name. */ |
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symbol_c *param_type(void) { |
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return current_param_type; |
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} |
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|
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/* Returns the currently referenced parameter's data passing direction. |
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* i.e. VAR_INPUT, VAR_OUTPUT or VAR_INOUT |
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*/ |
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param_direction_t param_direction(void) { |
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return current_param_direction; |
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} |
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|
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/******************************************/ |
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203 |
/* B 1.4.3 - Declaration & Initialisation */ |
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/******************************************/ |
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void *visit(input_declarations_c *symbol) { |
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TRACE("input_declarations_c"); |
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current_param_direction = direction_in; |
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return symbol->input_declaration_list->accept(*this); |
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} |
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void *visit(input_declaration_list_c *symbol) {TRACE("input_declaration_list_c"); return iterate_list(symbol);} |
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void *visit(edge_declaration_c *symbol) {TRACE("edge_declaration_c"); return symbol->var1_list->accept(*this);} |
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212 |
|
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#if 0 |
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/* var1_list ':' array_spec_init */ |
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SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init) |
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|
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/* var1_list ':' initialized_structure */ |
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SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure) |
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|
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/* name_list ':' function_block_type_name ASSIGN structure_initialization */ |
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/* structure_initialization -> may be NULL ! */ |
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SYM_REF4(fb_name_decl_c, fb_name_list, function_block_type_name, structure_initialization, unused) |
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223 |
|
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/* name_list ',' fb_name */ |
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SYM_LIST(fb_name_list_c) |
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#endif |
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|
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void *visit(output_declarations_c *symbol) { |
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TRACE("output_declarations_c"); |
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current_param_direction = direction_out; |
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return symbol->var_init_decl_list->accept(*this); |
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} |
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void *visit(input_output_declarations_c *symbol) { |
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TRACE("input_output_declarations_c"); |
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current_param_direction = direction_inout; |
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return symbol->var_declaration_list->accept(*this); |
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237 |
} |
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void *visit(var_declaration_list_c *symbol) {TRACE("var_declaration_list_c"); return iterate_list(symbol);} |
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239 |
|
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240 |
#if 0 |
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/* var1_list ':' array_specification */ |
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SYM_REF2(array_var_declaration_c, var1_list, array_specification) |
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|
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/* var1_list ':' structure_type_name */ |
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SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name) |
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#endif |
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247 |
|
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/* VAR [CONSTANT] var_init_decl_list END_VAR */ |
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void *visit(var_declarations_c *symbol) {TRACE("var_declarations_c"); return NULL;} |
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250 |
|
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251 |
#if 0 |
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/* VAR RETAIN var_init_decl_list END_VAR */ |
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SYM_REF2(retentive_var_declarations_c, var_init_decl_list, unused) |
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254 |
|
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/* VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */ |
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/* option -> may be NULL ! */ |
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257 |
SYM_REF2(located_var_declarations_c, option, located_var_decl_list) |
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258 |
|
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/* helper symbol for located_var_declarations */ |
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/* located_var_decl_list located_var_decl ';' */ |
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SYM_LIST(located_var_decl_list_c) |
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262 |
|
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/* [variable_name] location ':' located_var_spec_init */ |
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/* variable_name -> may be NULL ! */ |
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SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused) |
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#endif |
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267 |
|
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/*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */ |
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/* option -> may be NULL ! */ |
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// SYM_REF2(external_var_declarations_c, option, external_declaration_list) |
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void *visit(external_var_declarations_c *symbol) { |
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TRACE("external_var_declarations_c"); |
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current_param_direction = direction_extref; |
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return symbol->external_declaration_list->accept(*this); |
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} |
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276 |
|
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/* helper symbol for external_var_declarations */ |
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/*| external_declaration_list external_declaration';' */ |
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// SYM_LIST(external_declaration_list_c) |
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void *visit(external_declaration_list_c *symbol) {TRACE("external_declaration_list_c"); return iterate_list(symbol);} |
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281 |
|
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/* global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */ |
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//SYM_REF2(external_declaration_c, global_var_name, specification) |
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void *visit(external_declaration_c *symbol) { |
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TRACE("external_declaration_c"); |
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/* It is OK to store these values in the current_param_XXX |
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* variables, because if the desired parameter is not in the |
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* variable list we will be analysing, the current_param_XXXX |
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* variables will get overwritten when we visit the next |
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* var1_init_decl_c list! |
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*/ |
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current_param_default_value = spec_init_sperator_c::get_init(symbol->specification); |
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current_param_type = spec_init_sperator_c::get_spec(symbol->specification); |
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294 |
|
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return handle_single_param(symbol->global_var_name); |
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} |
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297 |
|
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298 |
|
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#if 0 |
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/*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */ |
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301 |
/* option -> may be NULL ! */ |
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302 |
SYM_REF2(global_var_declarations_c, option, global_var_decl_list) |
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303 |
|
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/* helper symbol for global_var_declarations */ |
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305 |
/*| global_var_decl_list global_var_decl ';' */ |
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306 |
SYM_LIST(global_var_decl_list_c) |
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307 |
|
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308 |
/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */ |
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309 |
/* type_specification ->may be NULL ! */ |
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310 |
SYM_REF2(global_var_decl_c, global_var_spec, type_specification) |
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311 |
|
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/*| global_var_name location */ |
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313 |
SYM_REF2(global_var_spec_c, global_var_name, location) |
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314 |
|
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/* AT direct_variable */ |
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316 |
SYM_REF2(location_c, direct_variable, unused) |
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317 |
|
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/*| global_var_list ',' global_var_name */ |
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319 |
SYM_LIST(global_var_list_c) |
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320 |
|
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321 |
/* var1_list ':' single_byte_string_spec */ |
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322 |
SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec) |
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323 |
|
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/* STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */ |
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325 |
/* integer ->may be NULL ! */ |
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326 |
/* single_byte_character_string ->may be NULL ! */ |
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327 |
SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string) |
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328 |
|
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329 |
/* var1_list ':' double_byte_string_spec */ |
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330 |
SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec) |
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331 |
|
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332 |
/* WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */ |
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333 |
/* integer ->may be NULL ! */ |
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334 |
/* double_byte_character_string ->may be NULL ! */ |
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335 |
SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string) |
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336 |
|
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337 |
/*| VAR [RETAIN|NON_RETAIN] incompl_located_var_decl_list END_VAR */ |
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338 |
/* option ->may be NULL ! */ |
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339 |
SYM_REF2(incompl_located_var_declarations_c, option, incompl_located_var_decl_list) |
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340 |
|
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341 |
/* helper symbol for incompl_located_var_declarations */ |
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342 |
/*| incompl_located_var_decl_list incompl_located_var_decl ';' */ |
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343 |
SYM_LIST(incompl_located_var_decl_list_c) |
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344 |
|
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345 |
/* variable_name incompl_location ':' var_spec */ |
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346 |
SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused) |
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347 |
|
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/* AT incompl_location_token */ |
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349 |
SYM_TOKEN(incompl_location_c) |
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350 |
#endif |
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351 |
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352 |
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void *visit(var1_init_decl_c *symbol) { |
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TRACE("var1_init_decl_c"); |
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/* It is OK to store these values in the current_param_XXX |
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* variables, because if the desired parameter is not in the |
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357 |
* variable list we will be analysing, the current_param_XXXX |
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* variables will get overwritten when we visit the next |
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* var1_init_decl_c list! |
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360 |
*/ |
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current_param_default_value = spec_init_sperator_c::get_init(symbol->spec_init); |
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current_param_type = spec_init_sperator_c::get_spec(symbol->spec_init); |
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363 |
|
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364 |
return symbol->var1_list->accept(*this); |
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365 |
} |
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366 |
|
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367 |
|
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368 |
|
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369 |
void *visit(var1_list_c *symbol) { |
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TRACE("var1_list_c"); |
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return handle_param_list(symbol); |
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372 |
} |
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373 |
|
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374 |
void *visit(var_init_decl_list_c *symbol) {TRACE("var_init_decl_list_c"); return iterate_list(symbol);} |
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375 |
|
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376 |
|
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377 |
/***********************/ |
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378 |
/* B 1.5.1 - Functions */ |
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379 |
/***********************/ |
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void *visit(function_declaration_c *symbol) {TRACE("function_declaration_c"); return symbol->var_declarations_list->accept(*this);} |
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381 |
/* intermediate helper symbol for function_declaration */ |
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382 |
void *visit(var_declarations_list_c *symbol) {TRACE("var_declarations_list_c"); return iterate_list(symbol);} |
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383 |
void *visit(function_var_decls_c *symbol) {TRACE("function_var_decls_c"); /* ignore */ return NULL;} |
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384 |
|
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385 |
|
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386 |
/*****************************/ |
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387 |
/* B 1.5.2 - Function Blocks */ |
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388 |
/*****************************/ |
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389 |
/* FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */ |
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390 |
void *visit(function_block_declaration_c *symbol) {TRACE("function_block_declaration_c"); return symbol->var_declarations->accept(*this);} |
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391 |
|
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392 |
/* intermediate helper symbol for function_declaration */ |
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393 |
/* { io_var_declarations | other_var_declarations } */ |
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394 |
/* |
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395 |
* NOTE: we re-use the var_declarations_list_c |
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396 |
*/ |
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397 |
|
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398 |
/* VAR_TEMP temp_var_decl_list END_VAR */ |
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399 |
void *visit(temp_var_decls_c *symbol) {TRACE("temp_var_decls_c"); /* ignore */ return NULL;} |
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400 |
void *visit(temp_var_decls_list_c *symbol) {TRACE("temp_var_decls_list_c"); /* ignore */ return NULL;} |
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401 |
|
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402 |
/* VAR NON_RETAIN var_init_decl_list END_VAR */ |
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403 |
void *visit(non_retentive_var_decls_c *symbol) {TRACE("non_retentive_var_decls_c"); /* ignore */ return NULL;} |
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404 |
|
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405 |
|
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406 |
/**********************/ |
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407 |
/* B 1.5.3 - Programs */ |
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408 |
/**********************/ |
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409 |
/* PROGRAM program_type_name program_var_declarations_list function_block_body END_PROGRAM */ |
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// SYM_REF4(program_declaration_c, program_type_name, var_declarations, function_block_body, unused) |
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void *visit(program_declaration_c *symbol) {TRACE("program_declaration_c"); return symbol->var_declarations->accept(*this);} |
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412 |
|
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413 |
/* intermediate helper symbol for program_declaration_c */ |
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414 |
/* { io_var_declarations | other_var_declarations } */ |
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415 |
/* |
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* NOTE: we re-use the var_declarations_list_c |
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417 |
*/ |
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418 |
|
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419 |
}; |
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420 |
|
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421 |
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422 |
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423 |
|
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424 |
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425 |
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426 |