mario@181: /*
mario@181:  * (c) 2003 Mario de Sousa
mario@181:  *
mario@181:  * Offered to the public under the terms of the GNU General Public License
mario@181:  * as published by the Free Software Foundation; either version 2 of the
mario@181:  * License, or (at your option) any later version.
mario@181:  *
mario@181:  * This program is distributed in the hope that it will be useful, but
mario@181:  * WITHOUT ANY WARRANTY; without even the implied warranty of
mario@181:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
mario@181:  * Public License for more details.
mario@181:  *
mario@181:  * This code is made available on the understanding that it will not be
mario@181:  * used in safety-critical situations without a full and competent review.
mario@181:  */
mario@181: 
mario@181: /*
mario@181:  * An IEC 61131-3 IL and ST compiler.
mario@181:  *
mario@181:  * Based on the
mario@181:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
mario@181:  *
mario@181:  */
mario@181: 
mario@181: 
mario@181: /*
mario@181:  * Function parameter iterator.
mario@181:  * Iterate through the in/out parameters of a function declaration.
mario@181:  * Function blocks are also suported.
mario@181:  *
mario@181:  * This is part of the 4th stage that generates
mario@181:  * a c++ source program equivalent to the IL and ST
mario@181:  * code.
mario@181:  */
mario@181: 
mario@181: /* Given a function_declaration_c, iterate through each
mario@181:  * function in/out/inout parameter, returning the name
mario@181:  * of each parameter...function_param_iterator_c
mario@181:  */
mario@181: 
mario@181: 
mario@181: 
mario@181: #include "function_param_iterator.hh"
mario@181: #include "spec_init_separator.hh"
mario@181: #include <strings.h>
mario@181: 
mario@181: 
mario@181: //#define DEBUG
mario@181: #ifdef DEBUG
mario@181: #define TRACE(classname) printf("\n____%s____\n",classname);
mario@181: #else
mario@181: #define TRACE(classname)
mario@181: #endif
mario@181: 
mario@181: 
mario@181: #define ERROR error_exit(__FILE__,__LINE__)
mario@181: /* function defined in main.cc */
mario@181: extern void error_exit(const char *file_name, int line_no);
mario@181: 
mario@181: 
mario@181: 
mario@181: void* function_param_iterator_c::handle_param_list(list_c *list) {
mario@181:   if (next_param <= param_count + list->n)
mario@181:     return list->elements[next_param - param_count - 1];
mario@181: 
mario@181:   /* the desired param is not on this list... */
mario@181:   param_count += list->n;
mario@181:  return NULL;
mario@181: }
mario@181: 
mario@181: void* function_param_iterator_c::handle_single_param(symbol_c *var_name) {
mario@181:   param_count++;
mario@181:   if (next_param == param_count)
mario@181:     return var_name;
mario@181: 
mario@181:   /* not yet the desired param... */
mario@181:  return NULL;
mario@181: }
mario@181: 
mario@181: void* function_param_iterator_c::iterate_list(list_c *list) {
mario@181:   void *res;
mario@181:   for (int i = 0; i < list->n; i++) {
mario@181:     res = list->elements[i]->accept(*this);
mario@181:     if (res != NULL)
mario@181:         return res;
mario@181:   }
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: /* start off at the first parameter once again... */
mario@181: void function_param_iterator_c::reset(void) {
mario@181:   next_param = param_count = 0;
mario@181:   current_param_name = NULL;
mario@181:   current_param_type = current_param_default_value = NULL;
mario@181:   en_declared = false;
mario@181:   eno_declared = false;
mario@181: }
mario@181: 
mario@181: /* initialise the iterator object.
mario@181:  * We must be given a reference to the function declaration
mario@181:  * that will be analysed...
mario@181:  */
mario@181: function_param_iterator_c::function_param_iterator_c(function_declaration_c *f_decl) {
mario@181:   this->f_decl = f_decl;
mario@181:   reset();
mario@181: }
mario@181: 
mario@181: /* initialise the iterator object.
mario@181:  * We must be given a reference to the function block declaration
mario@181:  * that will be analysed...
mario@181:  */
mario@181: function_param_iterator_c::function_param_iterator_c(function_block_declaration_c *fb_decl) {
mario@181:   this->f_decl = fb_decl;
mario@181:   reset();
mario@181: }
mario@181: 
mario@181: /* initialise the iterator object.
mario@181:  * We must be given a reference to the program declaration
mario@181:  * that will be analysed...
mario@181:  */
mario@181: function_param_iterator_c::function_param_iterator_c(program_declaration_c *p_decl) {
mario@181:   this->f_decl = p_decl;
mario@181:   reset();
mario@181: }
mario@181: 
mario@181: /* Skip to the next parameter. After object creation,
mario@181:  * the object references on parameter _before_ the first, so
mario@181:  * this function must be called once to get the object to
mario@181:  * reference the first parameter...
mario@181:  *
mario@181:  * Returns the parameter's name!
mario@181:  */
mario@181: identifier_c *function_param_iterator_c::next(void) {
mario@181:   void *res;
mario@181:   identifier_c *identifier;
mario@181:   param_count = 0;
mario@181:   next_param++;
mario@181:   res = f_decl->accept(*this);
mario@181:   if (res != NULL) {
mario@181:     symbol_c *sym = (symbol_c *)res;
mario@181:     identifier = dynamic_cast<identifier_c *>(sym);
mario@181:     if (identifier == NULL)
mario@181:       ERROR;
mario@181:   }
mario@181:   else if (!en_declared) {
mario@181:     current_param_direction = direction_in;
mario@181:     identifier = declare_en_param();
mario@181:   }
mario@181:   else if (!eno_declared) {
mario@181:     current_param_direction = direction_out;
mario@181:     identifier = declare_eno_param();
mario@181:   }
mario@181:   else
mario@181:     return NULL;
mario@181:   
mario@181:   current_param_name = identifier;
mario@181:   return current_param_name;
mario@181: }
mario@181: 
mario@181: identifier_c *function_param_iterator_c::declare_en_param(void) {
mario@181:   en_declared = true;
mario@181:   identifier_c *identifier = new identifier_c("EN");
mario@181:   current_param_type = (symbol_c*)(new bool_type_name_c());
mario@181:   current_param_default_value = (symbol_c*)(new boolean_literal_c(current_param_type, new boolean_true_c()));
mario@181:   return identifier;
mario@181: }
mario@181: 
mario@181: identifier_c *function_param_iterator_c::declare_eno_param(void) {
mario@181:   eno_declared = true;
mario@181:   identifier_c *identifier = new identifier_c("ENO");
mario@181:   current_param_type = (symbol_c*)(new bool_type_name_c());
mario@181:   current_param_default_value = NULL;
mario@181:   return identifier;
mario@181: }
mario@181: 
mario@181: /* Returns the currently referenced parameter's default value,
mario@181:  * or NULL if none is specified in the function declrataion itself.
mario@181:  */
mario@181: symbol_c *function_param_iterator_c::default_value(void) {
mario@181:   return current_param_default_value;
mario@181: }
mario@181: 
mario@181: /* Returns the currently referenced parameter's type name. */
mario@181: symbol_c *function_param_iterator_c::param_type(void) {
mario@181:   return current_param_type;
mario@181: }
mario@181: 
mario@181: /* Returns the currently referenced parameter's data passing direction.
mario@181:  * i.e. VAR_INPUT, VAR_OUTPUT or VAR_INOUT
mario@181:  */
mario@181: function_param_iterator_c::param_direction_t function_param_iterator_c::param_direction(void) {
mario@181:   return current_param_direction;
mario@181: }
mario@181: 
mario@181: /****************************************/
mario@181: /* 1.4.3 - Declaration & Initialisation */
mario@181: /****************************************/
mario@181: void *function_param_iterator_c::visit(input_declarations_c *symbol) {
mario@181:   TRACE("input_declarations_c");
mario@181:   current_param_direction = direction_in;
mario@181:   return symbol->input_declaration_list->accept(*this);
mario@181: }
mario@181: 
mario@181: void *function_param_iterator_c::visit(input_declaration_list_c *symbol) {TRACE("input_declaration_list_c"); return iterate_list(symbol);}
mario@181: 
mario@181: void *function_param_iterator_c::visit(edge_declaration_c *symbol) {TRACE("edge_declaration_c"); return symbol->var1_list->accept(*this);}
mario@181: 
mario@181: void *function_param_iterator_c::visit(en_param_declaration_c *symbol) {
mario@181:   TRACE("en_param_declaration_c");
mario@181:   if (en_declared) ERROR;
mario@181:   return (void *)declare_en_param();
mario@181: }
mario@181: 
mario@181: /* var1_list ':' array_spec_init */
mario@181: //SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init)
mario@181: void *function_param_iterator_c::visit(array_var_init_decl_c *symbol) {TRACE("array_var_init_decl_c"); return symbol->var1_list->accept(*this);}
mario@181: 
mario@181: /*  var1_list ':' initialized_structure */
mario@181: //SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure)
mario@181: void *function_param_iterator_c::visit(structured_var_init_decl_c *symbol) {TRACE("structured_var_init_decl_c"); return symbol->var1_list->accept(*this);}
mario@181: 
mario@181: void *function_param_iterator_c::visit(output_declarations_c *symbol) {
mario@181:   TRACE("output_declarations_c");
mario@181:   current_param_direction = direction_out;
mario@181:   return symbol->var_init_decl_list->accept(*this);
mario@181: }
mario@181: void *function_param_iterator_c::visit(eno_param_declaration_c *symbol) {
mario@181:   TRACE("eno_param_declaration_c");
mario@181:   if (eno_declared) ERROR;
mario@181:   return (void *)declare_eno_param();
mario@181: }
mario@181: void *function_param_iterator_c::visit(input_output_declarations_c *symbol) {
mario@181:   TRACE("input_output_declarations_c");
mario@181:   current_param_direction = direction_inout;
mario@181:   return symbol->var_declaration_list->accept(*this);
mario@181: }
mario@181: void *function_param_iterator_c::visit(var_declaration_list_c *symbol) {TRACE("var_declaration_list_c"); return iterate_list(symbol);}
mario@181: 
mario@181: /*  var1_list ':' array_specification */
mario@181: //SYM_REF2(array_var_declaration_c, var1_list, array_specification)
mario@181: void *function_param_iterator_c::visit(array_var_declaration_c *symbol) {TRACE("array_var_declaration_c"); return symbol->var1_list->accept(*this);}
mario@181: 
mario@181: /*  var1_list ':' structure_type_name */
mario@181: //SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name)
mario@181: void *function_param_iterator_c::visit(structured_var_declaration_c *symbol) {TRACE("structured_var_declaration_c"); return symbol->var1_list->accept(*this);}
mario@181: 
mario@181: /* VAR [CONSTANT] var_init_decl_list END_VAR */
mario@181: void *function_param_iterator_c::visit(var_declarations_c *symbol) {TRACE("var_declarations_c"); return NULL;}
mario@181: 
mario@181: /*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */
mario@181: /* option -> may be NULL ! */
mario@181: // SYM_REF2(external_var_declarations_c, option, external_declaration_list)
mario@181: void *function_param_iterator_c::visit(external_var_declarations_c *symbol) {
mario@181:   TRACE("external_var_declarations_c");
mario@181:   current_param_direction = direction_extref;
mario@181:   return symbol->external_declaration_list->accept(*this);
mario@181: }
mario@181: 
mario@181: /* helper symbol for external_var_declarations */
mario@181: /*| external_declaration_list external_declaration';' */
mario@181: // SYM_LIST(external_declaration_list_c)
mario@181: void *function_param_iterator_c::visit(external_declaration_list_c *symbol) {TRACE("external_declaration_list_c"); return iterate_list(symbol);}
mario@181: 
mario@181: /*  global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */
mario@181: //SYM_REF2(external_declaration_c, global_var_name, specification)
mario@181: void *function_param_iterator_c::visit(external_declaration_c *symbol) {
mario@181:   TRACE("external_declaration_c");
mario@181:   /* It is OK to store these values in the current_param_XXX
mario@181:    * variables, because if the desired parameter is not in the
mario@181:    * variable list we will be analysing, the current_param_XXXX
mario@181:    * variables will get overwritten when we visit the next
mario@181:    * var1_init_decl_c list!
mario@181:    */
mario@181:   current_param_default_value = spec_init_sperator_c::get_init(symbol->specification);
mario@181:   current_param_type = spec_init_sperator_c::get_spec(symbol->specification);
mario@181: 
mario@181:   return handle_single_param(symbol->global_var_name);
mario@181: }
mario@181: 
mario@181: 
mario@181: #if 0
mario@181: /*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */
mario@181: /* option -> may be NULL ! */
mario@181: SYM_REF2(global_var_declarations_c, option, global_var_decl_list)
mario@181: 
mario@181: /* helper symbol for global_var_declarations */
mario@181: /*| global_var_decl_list global_var_decl ';' */
mario@181: SYM_LIST(global_var_decl_list_c)
mario@181: 
mario@181: /*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
mario@181: /* type_specification ->may be NULL ! */
mario@181: SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
mario@181: 
mario@181: /*| global_var_name location */
mario@181: SYM_REF2(global_var_spec_c, global_var_name, location)
mario@181: 
mario@181: /*  AT direct_variable */
mario@181: SYM_REF2(location_c, direct_variable, unused)
mario@181: 
mario@181: /*| global_var_list ',' global_var_name */
mario@181: SYM_LIST(global_var_list_c)
mario@181: 
mario@181: /*  var1_list ':' single_byte_string_spec */
mario@181: SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec)
mario@181: 
mario@181: /*  STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */
mario@181: /* integer ->may be NULL ! */
mario@181: /* single_byte_character_string ->may be NULL ! */
mario@181: SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string)
mario@181: 
mario@181: /*  var1_list ':' double_byte_string_spec */
mario@181: SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec)
mario@181: 
mario@181: /*  WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */
mario@181: /* integer ->may be NULL ! */
mario@181: /* double_byte_character_string ->may be NULL ! */
mario@181: SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string)
mario@181: 
mario@181: /*| VAR [RETAIN|NON_RETAIN] incompl_located_var_decl_list END_VAR */
mario@181: /* option ->may be NULL ! */
mario@181: SYM_REF2(incompl_located_var_declarations_c, option, incompl_located_var_decl_list)
mario@181: 
mario@181: /* helper symbol for incompl_located_var_declarations */
mario@181: /*| incompl_located_var_decl_list incompl_located_var_decl ';' */
mario@181: SYM_LIST(incompl_located_var_decl_list_c)
mario@181: 
mario@181: /*  variable_name incompl_location ':' var_spec */
mario@181: SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused)
mario@181: 
mario@181: /*  AT incompl_location_token */
mario@181: SYM_TOKEN(incompl_location_c)
mario@181: #endif
mario@181: 
mario@181: 
mario@181: void *function_param_iterator_c::visit(var1_init_decl_c *symbol) {
mario@181:   TRACE("var1_init_decl_c");
mario@181:   /* It is OK to store these values in the current_param_XXX
mario@181:    * variables, because if the desired parameter is not in the
mario@181:    * variable list we will be analysing, the current_param_XXXX
mario@181:    * variables will get overwritten when we visit the next
mario@181:    * var1_init_decl_c list!
mario@181:    */
mario@181:   current_param_default_value = spec_init_sperator_c::get_init(symbol->spec_init);
mario@181:   current_param_type = spec_init_sperator_c::get_spec(symbol->spec_init);
mario@181: 
mario@181:   return symbol->var1_list->accept(*this);
mario@181: }
mario@181: 
mario@181: 
mario@181: 
mario@181: void *function_param_iterator_c::visit(var1_list_c *symbol) {
mario@181:   TRACE("var1_list_c");
mario@181:   return handle_param_list(symbol);
mario@181: }
mario@181: 
mario@181: void *function_param_iterator_c::visit(var_init_decl_list_c *symbol) {TRACE("var_init_decl_list_c"); return iterate_list(symbol);}
mario@181: 
mario@181: 
mario@181: /***********************/
mario@181: /* B 1.5.1 - Functions */
mario@181: /***********************/
mario@181: void *function_param_iterator_c::visit(function_declaration_c *symbol) {TRACE("function_declaration_c"); return symbol->var_declarations_list->accept(*this);}
mario@181: /* intermediate helper symbol for function_declaration */
mario@181: void *function_param_iterator_c::visit(var_declarations_list_c *symbol) {TRACE("var_declarations_list_c"); return iterate_list(symbol);}
mario@181: void *function_param_iterator_c::visit(function_var_decls_c *symbol) {TRACE("function_var_decls_c"); /* ignore */ return NULL;}
mario@181: 
mario@181: 
mario@181: /*****************************/
mario@181: /* B 1.5.2 - Function Blocks */
mario@181: /*****************************/
mario@181: /*  FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */
mario@181: void *function_param_iterator_c::visit(function_block_declaration_c *symbol) {TRACE("function_block_declaration_c"); return symbol->var_declarations->accept(*this);}
mario@181: 
mario@181: /* intermediate helper symbol for function_declaration */
mario@181: /*  { io_var_declarations | other_var_declarations }   */
mario@181: /*
mario@181:  * NOTE: we re-use the var_declarations_list_c
mario@181:  */
mario@181: 
mario@181: /*  VAR_TEMP temp_var_decl_list END_VAR */
mario@181: void *function_param_iterator_c::visit(temp_var_decls_c *symbol) {TRACE("temp_var_decls_c"); /* ignore */ return NULL;}
mario@181: void *function_param_iterator_c::visit(temp_var_decls_list_c *symbol) {TRACE("temp_var_decls_list_c"); /* ignore */ return NULL;}
mario@181: 
mario@181: /*  VAR NON_RETAIN var_init_decl_list END_VAR */
mario@181: void *function_param_iterator_c::visit(non_retentive_var_decls_c *symbol) {TRACE("non_retentive_var_decls_c"); /* ignore */ return NULL;}
mario@181: 
mario@181: 
mario@181: /**********************/
mario@181: /* B 1.5.3 - Programs */
mario@181: /**********************/
mario@181: /*  PROGRAM program_type_name program_var_declarations_list function_block_body END_PROGRAM */
mario@181: // SYM_REF4(program_declaration_c, program_type_name, var_declarations, function_block_body, unused)
mario@181: void *function_param_iterator_c::visit(program_declaration_c *symbol) {TRACE("program_declaration_c"); return symbol->var_declarations->accept(*this);}
mario@181: 
mario@181: /* intermediate helper symbol for program_declaration_c */
mario@181: /*  { io_var_declarations | other_var_declarations }   */
mario@181: /*
mario@181:  * NOTE: we re-use the var_declarations_list_c
mario@181:  */
mario@181: 
mario@181: 
mario@181: 
mario@181: 
mario@181: 
mario@181: