author | lbessard |
Fri, 21 Nov 2008 13:43:49 +0100 | |
changeset 151 | 3b898fb11e73 |
parent 146 | eef5e62048c7 |
child 160 | 59d58f5e6caa |
permissions | -rwxr-xr-x |
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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_c.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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bool en_declared; |
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bool eno_declared; |
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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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/* 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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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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/* not yet the desired param... */ |
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return NULL; |
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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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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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en_declared = false; |
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eno_declared = false; |
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} |
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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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/* 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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/* 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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/* 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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identifier_c *identifier; |
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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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symbol_c *sym = (symbol_c *)res; |
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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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else if (!en_declared) { |
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current_param_direction = direction_in; |
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identifier = declare_en_param(); |
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} |
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else if (!eno_declared) { |
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current_param_direction = direction_out; |
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identifier = declare_eno_param(); |
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} |
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else |
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return NULL; |
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current_param_name = identifier; |
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return current_param_name; |
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} |
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identifier_c *declare_en_param(void) { |
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en_declared = true; |
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identifier_c *identifier = new identifier_c("EN"); |
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current_param_type = (symbol_c*)(new bool_type_name_c()); |
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current_param_default_value = (symbol_c*)(new boolean_literal_c(current_param_type, new boolean_true_c())); |
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return identifier; |
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} |
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identifier_c *declare_eno_param(void) { |
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eno_declared = true; |
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identifier_c *identifier = new identifier_c("ENO"); |
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current_param_type = (symbol_c*)(new bool_type_name_c()); |
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current_param_default_value = NULL; |
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return identifier; |
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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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/* 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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/* 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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/* 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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void *visit(en_param_declaration_c *symbol) { |
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TRACE("en_param_declaration_c"); |
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if (en_declared) ERROR; |
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return (void *)declare_en_param(); |
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} |
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#if 0 |
248 |
/* 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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/* var1_list ':' initialized_structure */ |
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SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure) |
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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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/* name_list ',' fb_name */ |
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SYM_LIST(fb_name_list_c) |
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#endif |
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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(eno_param_declaration_c *symbol) { |
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TRACE("eno_param_declaration_c"); |
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if (eno_declared) ERROR; |
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return (void *)declare_eno_param(); |
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} |
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void *visit(input_output_declarations_c *symbol) { |
273 |
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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} |
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void *visit(var_declaration_list_c *symbol) {TRACE("var_declaration_list_c"); return iterate_list(symbol);} |
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#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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/* 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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/* 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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#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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/* VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */ |
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/* option -> may be NULL ! */ |
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SYM_REF2(located_var_declarations_c, option, located_var_decl_list) |
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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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301 |
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302 |
/* [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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/*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */ |
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308 |
/* option -> may be NULL ! */ |
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// SYM_REF2(external_var_declarations_c, option, external_declaration_list) |
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310 |
void *visit(external_var_declarations_c *symbol) { |
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311 |
TRACE("external_var_declarations_c"); |
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312 |
current_param_direction = direction_extref; |
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return symbol->external_declaration_list->accept(*this); |
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} |
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315 |
||
316 |
/* helper symbol for external_var_declarations */ |
|
317 |
/*| external_declaration_list external_declaration';' */ |
|
318 |
// SYM_LIST(external_declaration_list_c) |
|
319 |
void *visit(external_declaration_list_c *symbol) {TRACE("external_declaration_list_c"); return iterate_list(symbol);} |
|
320 |
||
321 |
/* global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */ |
|
322 |
//SYM_REF2(external_declaration_c, global_var_name, specification) |
|
323 |
void *visit(external_declaration_c *symbol) { |
|
324 |
TRACE("external_declaration_c"); |
|
325 |
/* It is OK to store these values in the current_param_XXX |
|
326 |
* variables, because if the desired parameter is not in the |
|
327 |
* variable list we will be analysing, the current_param_XXXX |
|
328 |
* variables will get overwritten when we visit the next |
|
329 |
* var1_init_decl_c list! |
|
330 |
*/ |
|
331 |
current_param_default_value = spec_init_sperator_c::get_init(symbol->specification); |
|
332 |
current_param_type = spec_init_sperator_c::get_spec(symbol->specification); |
|
333 |
||
334 |
return handle_single_param(symbol->global_var_name); |
|
335 |
} |
|
336 |
||
337 |
||
338 |
#if 0 |
|
339 |
/*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */ |
|
340 |
/* option -> may be NULL ! */ |
|
341 |
SYM_REF2(global_var_declarations_c, option, global_var_decl_list) |
|
342 |
||
343 |
/* helper symbol for global_var_declarations */ |
|
344 |
/*| global_var_decl_list global_var_decl ';' */ |
|
345 |
SYM_LIST(global_var_decl_list_c) |
|
346 |
||
347 |
/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */ |
|
348 |
/* type_specification ->may be NULL ! */ |
|
349 |
SYM_REF2(global_var_decl_c, global_var_spec, type_specification) |
|
350 |
||
351 |
/*| global_var_name location */ |
|
352 |
SYM_REF2(global_var_spec_c, global_var_name, location) |
|
353 |
||
354 |
/* AT direct_variable */ |
|
355 |
SYM_REF2(location_c, direct_variable, unused) |
|
356 |
||
357 |
/*| global_var_list ',' global_var_name */ |
|
358 |
SYM_LIST(global_var_list_c) |
|
359 |
||
360 |
/* var1_list ':' single_byte_string_spec */ |
|
361 |
SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec) |
|
362 |
||
363 |
/* STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */ |
|
364 |
/* integer ->may be NULL ! */ |
|
365 |
/* single_byte_character_string ->may be NULL ! */ |
|
366 |
SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string) |
|
367 |
||
368 |
/* var1_list ':' double_byte_string_spec */ |
|
369 |
SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec) |
|
370 |
||
371 |
/* WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */ |
|
372 |
/* integer ->may be NULL ! */ |
|
373 |
/* double_byte_character_string ->may be NULL ! */ |
|
374 |
SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string) |
|
375 |
||
376 |
/*| VAR [RETAIN|NON_RETAIN] incompl_located_var_decl_list END_VAR */ |
|
377 |
/* option ->may be NULL ! */ |
|
378 |
SYM_REF2(incompl_located_var_declarations_c, option, incompl_located_var_decl_list) |
|
379 |
||
380 |
/* helper symbol for incompl_located_var_declarations */ |
|
381 |
/*| incompl_located_var_decl_list incompl_located_var_decl ';' */ |
|
382 |
SYM_LIST(incompl_located_var_decl_list_c) |
|
383 |
||
384 |
/* variable_name incompl_location ':' var_spec */ |
|
385 |
SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused) |
|
386 |
||
387 |
/* AT incompl_location_token */ |
|
388 |
SYM_TOKEN(incompl_location_c) |
|
389 |
#endif |
|
390 |
||
391 |
||
392 |
void *visit(var1_init_decl_c *symbol) { |
|
393 |
TRACE("var1_init_decl_c"); |
|
394 |
/* It is OK to store these values in the current_param_XXX |
|
395 |
* variables, because if the desired parameter is not in the |
|
396 |
* variable list we will be analysing, the current_param_XXXX |
|
397 |
* variables will get overwritten when we visit the next |
|
398 |
* var1_init_decl_c list! |
|
399 |
*/ |
|
400 |
current_param_default_value = spec_init_sperator_c::get_init(symbol->spec_init); |
|
401 |
current_param_type = spec_init_sperator_c::get_spec(symbol->spec_init); |
|
402 |
||
403 |
return symbol->var1_list->accept(*this); |
|
404 |
} |
|
405 |
||
406 |
||
407 |
||
408 |
void *visit(var1_list_c *symbol) { |
|
409 |
TRACE("var1_list_c"); |
|
410 |
return handle_param_list(symbol); |
|
411 |
} |
|
412 |
||
413 |
void *visit(var_init_decl_list_c *symbol) {TRACE("var_init_decl_list_c"); return iterate_list(symbol);} |
|
414 |
||
415 |
||
416 |
/***********************/ |
|
417 |
/* B 1.5.1 - Functions */ |
|
418 |
/***********************/ |
|
419 |
void *visit(function_declaration_c *symbol) {TRACE("function_declaration_c"); return symbol->var_declarations_list->accept(*this);} |
|
420 |
/* intermediate helper symbol for function_declaration */ |
|
421 |
void *visit(var_declarations_list_c *symbol) {TRACE("var_declarations_list_c"); return iterate_list(symbol);} |
|
422 |
void *visit(function_var_decls_c *symbol) {TRACE("function_var_decls_c"); /* ignore */ return NULL;} |
|
423 |
||
424 |
||
425 |
/*****************************/ |
|
426 |
/* B 1.5.2 - Function Blocks */ |
|
427 |
/*****************************/ |
|
428 |
/* FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */ |
|
429 |
void *visit(function_block_declaration_c *symbol) {TRACE("function_block_declaration_c"); return symbol->var_declarations->accept(*this);} |
|
430 |
||
431 |
/* intermediate helper symbol for function_declaration */ |
|
432 |
/* { io_var_declarations | other_var_declarations } */ |
|
433 |
/* |
|
434 |
* NOTE: we re-use the var_declarations_list_c |
|
435 |
*/ |
|
436 |
||
437 |
/* VAR_TEMP temp_var_decl_list END_VAR */ |
|
438 |
void *visit(temp_var_decls_c *symbol) {TRACE("temp_var_decls_c"); /* ignore */ return NULL;} |
|
439 |
void *visit(temp_var_decls_list_c *symbol) {TRACE("temp_var_decls_list_c"); /* ignore */ return NULL;} |
|
440 |
||
441 |
/* VAR NON_RETAIN var_init_decl_list END_VAR */ |
|
442 |
void *visit(non_retentive_var_decls_c *symbol) {TRACE("non_retentive_var_decls_c"); /* ignore */ return NULL;} |
|
443 |
||
444 |
||
445 |
/**********************/ |
|
446 |
/* B 1.5.3 - Programs */ |
|
447 |
/**********************/ |
|
448 |
/* PROGRAM program_type_name program_var_declarations_list function_block_body END_PROGRAM */ |
|
449 |
// SYM_REF4(program_declaration_c, program_type_name, var_declarations, function_block_body, unused) |
|
450 |
void *visit(program_declaration_c *symbol) {TRACE("program_declaration_c"); return symbol->var_declarations->accept(*this);} |
|
451 |
||
452 |
/* intermediate helper symbol for program_declaration_c */ |
|
453 |
/* { io_var_declarations | other_var_declarations } */ |
|
454 |
/* |
|
455 |
* NOTE: we re-use the var_declarations_list_c |
|
456 |
*/ |
|
457 |
||
458 |
}; |
|
459 |
||
460 |
||
461 |
||
462 |
||
463 |
||
464 |
||
465 |