msousa@417: /*
msousa@417:  *  matiec - a compiler for the programming languages defined in IEC 61131-3
msousa@417:  *
msousa@417:  *  Copyright (C) 2009-2012  Mario de Sousa (msousa@fe.up.pt)
msousa@417:  *  Copyright (C) 2012       Manuele Conti (manuele.conti@sirius-es.it)
msousa@417:  *  Copyright (C) 2012       Matteo Facchinetti (matteo.facchinetti@sirius-es.it)
msousa@417:  *
msousa@417:  *  This program is free software: you can redistribute it and/or modify
msousa@417:  *  it under the terms of the GNU General Public License as published by
msousa@417:  *  the Free Software Foundation, either version 3 of the License, or
msousa@417:  *  (at your option) any later version.
msousa@417:  *
msousa@417:  *  This program is distributed in the hope that it will be useful,
msousa@417:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
msousa@417:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
msousa@417:  *  GNU General Public License for more details.
msousa@417:  *
msousa@417:  *  You should have received a copy of the GNU General Public License
msousa@417:  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
msousa@417:  *
msousa@417:  *
msousa@417:  * This code is made available on the understanding that it will not be
msousa@417:  * used in safety-critical situations without a full and competent review.
msousa@417:  */
msousa@417: 
msousa@417: /*
msousa@417:  * An IEC 61131-3 compiler.
msousa@417:  *
msousa@417:  * Based on the
msousa@417:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
msousa@417:  *
msousa@417:  */
msousa@417: 
msousa@417: 
msousa@417: /*
msousa@417:  *  Fill candidate list of data types for all symbols
msousa@417:  */
msousa@417: 
msousa@417: #include "fill_candidate_datatypes.hh"
msousa@417: #include "datatype_functions.hh"
msousa@417: #include <typeinfo>
msousa@417: #include <list>
msousa@417: #include <string>
msousa@417: #include <string.h>
msousa@417: #include <strings.h>
msousa@417: 
msousa@417: /* set to 1 to see debug info during execution */
msousa@417: static int debug = 0;
msousa@417: 
msousa@417: fill_candidate_datatypes_c::fill_candidate_datatypes_c(symbol_c *ignore) {
msousa@417: }
msousa@417: 
msousa@417: fill_candidate_datatypes_c::~fill_candidate_datatypes_c(void) {
msousa@417: }
msousa@417: 
msousa@417: symbol_c *fill_candidate_datatypes_c::widening_conversion(symbol_c *left_type, symbol_c *right_type, const struct widen_entry widen_table[]) {
msousa@417: 	int k;
msousa@417: 	/* find a widening table entry compatible */
msousa@417: 	for (k = 0; NULL != widen_table[k].left;  k++)
msousa@417: 		if ((typeid(*left_type) == typeid(*widen_table[k].left)) && (typeid(*right_type) == typeid(*widen_table[k].right)))
msousa@417: 			return widen_table[k].result;
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@421: 
msousa@421: 
msousa@421: 
msousa@420: /* returns true if compatible function/FB invocation, otherwise returns false */
msousa@424: /* Assumes that the candidate_datatype lists of all the parameters being passed haved already been filled in */
msousa@443: /*
msousa@443:  * All parameters being passed to the called function MUST be in the parameter list to which f_call points to!
msousa@443:  * This means that, for non formal function calls in IL, de current (default value) must be artificially added to the
msousa@443:  * beginning of the parameter list BEFORE calling handle_function_call().
msousa@443:  */
msousa@420: bool fill_candidate_datatypes_c::match_nonformal_call(symbol_c *f_call, symbol_c *f_decl) {
msousa@449: 	symbol_c *call_param_value,  *param_datatype;
msousa@417: 	identifier_c *param_name;
msousa@417: 	function_param_iterator_c       fp_iterator(f_decl);
msousa@417: 	function_call_param_iterator_c fcp_iterator(f_call);
msousa@417: 	int extensible_parameter_highest_index = -1;
msousa@417: 	unsigned int i;
msousa@417: 
msousa@417: 	/* Iterating through the non-formal parameters of the function call */
msousa@417: 	while((call_param_value = fcp_iterator.next_nf()) != NULL) {
msousa@417: 		/* Iterate to the next parameter of the function being called.
msousa@417: 		 * Get the name of that parameter, and ignore if EN or ENO.
msousa@417: 		 */
msousa@417: 		do {
msousa@417: 			param_name = fp_iterator.next();
msousa@417: 			/* If there is no other parameter declared, then we are passing too many parameters... */
msousa@420: 			if(param_name == NULL) return false;
msousa@417: 		} while ((strcmp(param_name->value, "EN") == 0) || (strcmp(param_name->value, "ENO") == 0));
msousa@417: 
msousa@417: 		/* Get the parameter type */
msousa@449: 		param_datatype = base_type(fp_iterator.param_type());
msousa@420: 		
msousa@420: 		/* check whether one of the candidate_data_types of the value being passed is the same as the param_type */
msousa@449: 		if (search_in_candidate_datatype_list(param_datatype, call_param_value->candidate_datatypes) < 0)
msousa@442: 			return false; /* return false if param_type not in the list! */
msousa@420: 	}
msousa@420: 	/* call is compatible! */
msousa@420: 	return true;
msousa@420: }
msousa@420: 
msousa@421: 
msousa@421: 
msousa@420: /* returns true if compatible function/FB invocation, otherwise returns false */
msousa@424: /* Assumes that the candidate_datatype lists of all the parameters being passed haved already been filled in */
msousa@420: bool fill_candidate_datatypes_c::match_formal_call(symbol_c *f_call, symbol_c *f_decl) {
msousa@449: 	symbol_c *call_param_value, *call_param_name, *param_datatype;
msousa@417: 	symbol_c *verify_duplicate_param;
msousa@417: 	identifier_c *param_name;
msousa@417: 	function_param_iterator_c       fp_iterator(f_decl);
msousa@417: 	function_call_param_iterator_c fcp_iterator(f_call);
msousa@417: 	int extensible_parameter_highest_index = -1;
msousa@417: 	identifier_c *extensible_parameter_name;
msousa@417: 	unsigned int i;
msousa@417: 
msousa@417: 	/* Iterating through the formal parameters of the function call */
msousa@417: 	while((call_param_name = fcp_iterator.next_f()) != NULL) {
msousa@417: 		/* Obtaining the value being passed in the function call */
msousa@417: 		call_param_value = fcp_iterator.get_current_value();
msousa@417: 		/* the following should never occur. If it does, then we have a bug in our code... */
msousa@417: 		if (NULL == call_param_value) ERROR;
msousa@417: 
msousa@449: 		/* Obtaining the assignment direction:  := (assign_in) or => (assign_out) */
msousa@449: 		function_call_param_iterator_c::assign_direction_t call_param_dir = fcp_iterator.get_assign_direction();
msousa@449: 
msousa@417: 		/* Checking if there are duplicated parameter values */
msousa@417: 		verify_duplicate_param = fcp_iterator.search_f(call_param_name);
msousa@417: 		if(verify_duplicate_param != call_param_value)
msousa@420: 			return false;
msousa@417: 
msousa@417: 		/* Obtaining the type of the value being passed in the function call */
msousa@417: 		std::vector <symbol_c *>&call_param_types = call_param_value->candidate_datatypes;
msousa@417: 
msousa@417: 		/* Find the corresponding parameter in function declaration */
msousa@417: 		param_name = fp_iterator.search(call_param_name);
msousa@421: 		if(param_name == NULL) return false;
msousa@449: 		/* Get the parameter data type */
msousa@449: 		param_datatype = base_type(fp_iterator.param_type());
msousa@449: 		/* Get the parameter direction: IN, OUT, IN_OUT */
msousa@449: 		function_param_iterator_c::param_direction_t param_dir = fp_iterator.param_direction();
msousa@449: 
msousa@449: 		/* check whether direction (IN, OUT, IN_OUT) and assignment types (:= , =>) are compatible !!! */
msousa@449: 		if          (function_call_param_iterator_c::assign_in  == call_param_dir) {
msousa@449: 			if ((function_param_iterator_c::direction_in    != param_dir) &&
msousa@449: 			    (function_param_iterator_c::direction_inout != param_dir))
msousa@449: 				return false;
msousa@449: 		} else if   (function_call_param_iterator_c::assign_out == call_param_dir) {
msousa@449: 			if ((function_param_iterator_c::direction_out   != param_dir))
msousa@449: 				return false;
msousa@449: 		} else ERROR;
msousa@449: 		
msousa@421: 		/* check whether one of the candidate_data_types of the value being passed is the same as the param_type */
msousa@449: 		if (search_in_candidate_datatype_list(param_datatype, call_param_types) < 0)
msousa@442: 			return false; /* return false if param_type not in the list! */
msousa@421: 	}
msousa@421: 	/* call is compatible! */
msousa@420: 	return true;
msousa@417: }
msousa@417: 
msousa@421: 
msousa@421: 
msousa@421: 
msousa@438: /* Handle a generic function call!
msousa@438:  * Assumes that the parameter_list containing the values being passed in this function invocation
msousa@438:  * has already had all the candidate_datatype lists filled in!
msousa@438:  *
msousa@438:  * All parameters being passed to the called function MUST be in the parameter list to which f_call points to!
msousa@438:  * This means that, for non formal function calls in IL, de current (default value) must be artificially added to the
msousa@438:  * beginning of the parameter list BEFORE calling handle_function_call().
msousa@438:  */
msousa@438: /*
msousa@438: typedef struct {
msousa@438:   symbol_c *function_name,
msousa@438:   symbol_c *nonformal_operand_list,
msousa@438:   symbol_c *   formal_operand_list,
msousa@438: 
msousa@438:   std::vector <symbol_c *> &candidate_functions,  
msousa@438:   symbol_c &*called_function_declaration,
msousa@438:   int      &extensible_param_count
msousa@438: } generic_function_call_t;
msousa@438: */
msousa@438: /*
msousa@438: void narrow_candidate_datatypes_c::narrow_function_invocation(symbol_c *fcall, generic_function_call_t fcall_data) {
msousa@438: void *fill_candidate_datatypes_c::handle_function_call(symbol_c *f_call, symbol_c *function_name, invocation_type_t invocation_type,
msousa@438:                                                        std::vector <symbol_c *> *candidate_datatypes,
msousa@438:                                                        std::vector <symbol_c *> *candidate_functions) {
msousa@438:   */
msousa@438: void fill_candidate_datatypes_c::handle_function_call(symbol_c *fcall, generic_function_call_t fcall_data) {
msousa@438: 	function_declaration_c *f_decl;
msousa@438: 	list_c *parameter_list;
msousa@438: 	list_c *parameter_candidate_datatypes;
msousa@438: 	symbol_c *returned_parameter_type;
msousa@438: 
msousa@438: 	if (debug) std::cout << "function()\n";
msousa@438: 
msousa@438: 	function_symtable_t::iterator lower = function_symtable.lower_bound(fcall_data.function_name);
msousa@438: 	function_symtable_t::iterator upper = function_symtable.upper_bound(fcall_data.function_name);
msousa@438: 	/* If the name of the function being called is not found in the function symbol table, then this is an invalid call */
msousa@438: 	/* Since the lexical parser already checks for this, then if this occurs then we have an internal compiler error. */
msousa@438: 	if (lower == function_symtable.end()) ERROR;
msousa@438: 	
msousa@438: 	/* Look for all compatible function declarations, and add their return datatypes 
msousa@438: 	 * to the candidate_datatype list of this function invocation. 
msousa@438: 	 *
msousa@438: 	 * If only one function exists, we add its return datatype to the candidate_datatype list,
msousa@438: 	 * even if the parameters passed to it are invalid.
msousa@438: 	 * This guarantees that the remainder of the expression in which the function call is inserted
msousa@438: 	 * is treated as if the function call returns correctly, and therefore does not generate
msousa@438: 	 * spurious error messages.
msousa@438: 	 * Even if the parameters to the function call are invalid, doing this is still safe, as the 
msousa@438: 	 * expressions inside the function call will themselves have erros and will  guarantee that 
msousa@438: 	 * compilation is aborted in stage3 (in print_datatypes_error_c).
msousa@438: 	 */
msousa@438: 	if (function_symtable.multiplicity(fcall_data.function_name) == 1) {
msousa@438: 		f_decl = function_symtable.get_value(lower);
msousa@438: 		returned_parameter_type = base_type(f_decl->type_name);
msousa@438: 		fcall_data.candidate_functions.push_back(f_decl);
msousa@438: 		fcall->    candidate_datatypes.push_back(returned_parameter_type);
msousa@438: 	}
msousa@438: 	for(; lower != upper; lower++) {
msousa@438: 		bool compatible = false;
msousa@438: 		
msousa@438: 		f_decl = function_symtable.get_value(lower);
msousa@438: 		/* Check if function declaration in symbol_table is compatible with parameters */
msousa@438: 		if (NULL != fcall_data.nonformal_operand_list) compatible=match_nonformal_call(fcall, f_decl);
msousa@438: 		if (NULL != fcall_data.   formal_operand_list) compatible=   match_formal_call(fcall, f_decl);
msousa@438: 		if (compatible) {
msousa@438: 			/* Add the data type returned by the called functions. 
msousa@438: 			 * However, only do this if this data type is not already present in the candidate_datatypes list_c
msousa@438: 			 */
msousa@438: 			/* TODO
msousa@438: 			 * call  int search_in_datatype_list(symbol_c *datatype, std::vector <symbol_c *> candidate_datatypes);
msousa@438: 			 * instead of using for loop!
msousa@438: 			 */
msousa@438: 			unsigned int k;
msousa@438: 			returned_parameter_type = base_type(f_decl->type_name);
msousa@438: 			for(k = 0; k < fcall->candidate_datatypes.size(); k++) {
msousa@438: 				if (is_type_equal(returned_parameter_type, fcall->candidate_datatypes[k]))
msousa@438: 					break;
msousa@438: 			}
msousa@438: 			if (k >= fcall->candidate_datatypes.size()) {
msousa@438: 				fcall->    candidate_datatypes.push_back(returned_parameter_type);
msousa@438: 				fcall_data.candidate_functions.push_back(f_decl);
msousa@438: 			}
msousa@438: 		}
msousa@438: 	}
msousa@438: 	if (debug) std::cout << "end_function() [" << fcall->candidate_datatypes.size() << "] result.\n";
msousa@438: 	return;
msousa@438: }
msousa@438: 
msousa@438: 
msousa@447: /* handle implicit FB call in IL.
msousa@448:  * e.g.  CLK ton_var
msousa@447:  *        CU counter_var
msousa@447:  *
msousa@447:  * The algorithm will be to build a fake il_fb_call_c equivalent to the implicit IL FB call, and let 
msousa@447:  * the visit(il_fb_call_c *) method handle it!
msousa@447:  */
msousa@447: void fill_candidate_datatypes_c::handle_implicit_il_fb_call(symbol_c *il_instruction, const char *param_name, symbol_c *&called_fb_declaration) {
msousa@448: 	if (NULL == il_operand)
msousa@448: 		/* No FB to call was specified. There is nothing we can do... */
msousa@448: 		return;
msousa@448: 
msousa@447: 	symbol_c *fb_type_id = search_varfb_instance_type->get_basetype_id(il_operand);
msousa@447: 	/* This is a call to a non-declared FB/Variable is a semantic error (which is currently caught by stage 2, so this should never occur)
msousa@447: 	 * or no operand was given (il_operand == NULL). In this case, we just give up!
msousa@447: 	 */
msousa@447: 	if (NULL == fb_type_id)
msousa@447: 		return;
msousa@447: 
msousa@447: 	function_block_declaration_c *fb_decl = function_block_type_symtable.find_value(fb_type_id);
msousa@447: 	if (function_block_type_symtable.end_value() == fb_decl)
msousa@447: 		/* The il_operand is not the name of a FB instance. Most probably it is the name of a variable of some other type.
msousa@447: 		 * this is a smeantic error, so there is no way we can evaluate the rest of the code. We simply give up, and leave
msousa@447: 		 * the candidate_datatype_list empty, and the called_fb_declaration pointing to NULL
msousa@447: 		 */
msousa@447: 		return;
msousa@447: 
msousa@448: 	if (NULL == prev_il_instruction) {
msousa@448: 		/* This IL implicit FB call (e.g. CLK ton_var) is not preceded by another IL instruction
msousa@448: 		 * (or list of instructions) that will set the IL current/default value.
msousa@448: 		 * We cannot proceed verifying type compatibility of something that does not ecist.
msousa@448: 		 */
msousa@448: 		return;
msousa@448: 	}
msousa@447: 
msousa@450: 	/* The value being passed to the 'param_name' parameter is actually the prev_il_instruction.
msousa@450: 	 * However, we do not place that object directly in the fake il_param_list_c that we will be
msousa@450: 	 * creating, since the visit(il_fb_call_c *) method will recursively call every object in that list.
msousa@450: 	 * The il_prev_intruction object has already been visited. We DO NOT want to visit it again.
msousa@450: 	 * The easiest way to work around this is to simply use a new object, and copy the relevant details to that object!
msousa@450: 	 */
msousa@450: 	symbol_c param_value;
msousa@450: 	copy_candidate_datatype_list(prev_il_instruction/*from*/, &param_value/*to*/);
msousa@450: 	
msousa@447: 	identifier_c variable_name(param_name);
msousa@447: 	// SYM_REF1(il_assign_operator_c, variable_name)
msousa@447: 	il_assign_operator_c il_assign_operator(&variable_name);  
msousa@447: 	// SYM_REF3(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list)
msousa@450: 	il_param_assignment_c il_param_assignment(&il_assign_operator, &param_value/*il_operand*/, NULL);
msousa@447: 	il_param_list_c il_param_list;
msousa@447: 	il_param_list.add_element(&il_param_assignment);
msousa@447: 	// SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list, symbol_c *called_fb_declaration)
msousa@447: 	il_fb_call_c il_fb_call(NULL, il_operand, NULL, &il_param_list);
msousa@447: 	
msousa@447: 	il_fb_call.accept(*this);
msousa@447: 	copy_candidate_datatype_list(&il_fb_call/*from*/, il_instruction/*to*/);
msousa@447: 	called_fb_declaration = il_fb_call.called_fb_declaration;
msousa@447: }
msousa@438: 
msousa@438: 
msousa@417: /* a helper function... */
msousa@417: symbol_c *fill_candidate_datatypes_c::base_type(symbol_c *symbol) {
msousa@417: 	/* NOTE: symbol == NULL is valid. It will occur when, for e.g., an undefined/undeclared symbolic_variable is used
msousa@417: 	 *       in the code.
msousa@417: 	 */
msousa@417: 	if (symbol == NULL) return NULL;
msousa@417: 	return (symbol_c *)symbol->accept(search_base_type);
msousa@417: }
msousa@417: 
msousa@417: /*********************/
msousa@417: /* B 1.2 - Constants */
msousa@417: /*********************/
msousa@417: /******************************/
msousa@417: /* B 1.2.1 - Numeric Literals */
msousa@417: /******************************/
msousa@417: void *fill_candidate_datatypes_c::visit(real_c *symbol) {
msousa@417: 	int calc_size;
msousa@417: 
msousa@417: 	calc_size = sizeoftype(symbol);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::real_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::real_type_name);
msousa@429: 	if (calc_size <= sizeoftype(&search_constant_type_c::lreal_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::lreal_type_name);
msousa@417: 	if (debug) std::cout << "ANY_REAL [" << symbol->candidate_datatypes.size() << "]" << std::endl;
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(integer_c *symbol) {
msousa@417: 	int calc_size;
msousa@417: 
msousa@417: 	calc_size = sizeoftype(symbol);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::bool_type_name))
msousa@417: 	        symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::byte_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::byte_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::word_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::word_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::dword_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::dword_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::lword_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::lword_type_name);
msousa@417: 
msousa@417: 	if (calc_size < sizeoftype(&search_constant_type_c::sint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::sint_type_name);
msousa@417: 	if (calc_size < sizeoftype(&search_constant_type_c::int_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::int_type_name);
msousa@417: 	if (calc_size < sizeoftype(&search_constant_type_c::dint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::dint_type_name);
msousa@417: 	if (calc_size < sizeoftype(&search_constant_type_c::lint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::lint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::usint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::usint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::uint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::uint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::udint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::udint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::ulint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::ulint_type_name);
msousa@417: 	if (debug) std::cout << "ANY_INT [" << symbol->candidate_datatypes.size()<< "]" << std::endl;
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(neg_real_c *symbol) {
msousa@417: 	if (sizeoftype(symbol) <= sizeoftype(&search_constant_type_c::real_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::real_type_name);
msousa@417: 	symbol->candidate_datatypes.push_back(&search_constant_type_c::lreal_type_name);
msousa@417: 	if (debug) std::cout << "neg ANY_REAL [" << symbol->candidate_datatypes.size() << "]" << std::endl;
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(neg_integer_c *symbol) {
msousa@417: 	int calc_size;
msousa@417: 
msousa@417: 	calc_size = sizeoftype(symbol);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::int_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::int_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::sint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::sint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::dint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::dint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::lint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::lint_type_name);
msousa@417: 	if (debug) std::cout << "neg ANY_INT [" << symbol->candidate_datatypes.size() << "]" << std::endl;
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(binary_integer_c *symbol) {
msousa@417: 	int calc_size;
msousa@417: 
msousa@417: 	calc_size = sizeoftype(symbol);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::bool_type_name))
msousa@417: 	        symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::byte_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::byte_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::word_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::word_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::dword_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::dword_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::lword_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::lword_type_name);
msousa@417: 	
msousa@417: 	if (calc_size < sizeoftype(&search_constant_type_c::sint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::sint_type_name);
msousa@417: 	if (calc_size < sizeoftype(&search_constant_type_c::int_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::int_type_name);
msousa@417: 	if (calc_size < sizeoftype(&search_constant_type_c::dint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::dint_type_name);
msousa@417: 	if (calc_size < sizeoftype(&search_constant_type_c::lint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::lint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::usint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::usint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::uint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::uint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::udint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::udint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::ulint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::ulint_type_name);
msousa@417: 	if (debug) std::cout << "ANY_INT [" << symbol->candidate_datatypes.size()<< "]" << std::endl;
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(octal_integer_c *symbol) {
msousa@417: 	int calc_size;
msousa@417: 
msousa@417: 	calc_size = sizeoftype(symbol);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::bool_type_name))
msousa@417: 	        symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::byte_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::byte_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::word_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::word_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::dword_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::dword_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::lword_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::lword_type_name);
msousa@417: 
msousa@417: 	if (calc_size < sizeoftype(&search_constant_type_c::sint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::sint_type_name);
msousa@417: 	if (calc_size < sizeoftype(&search_constant_type_c::int_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::int_type_name);
msousa@417: 	if (calc_size < sizeoftype(&search_constant_type_c::dint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::dint_type_name);
msousa@417: 	if (calc_size < sizeoftype(&search_constant_type_c::lint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::lint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::usint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::usint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::uint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::uint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::udint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::udint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::ulint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::ulint_type_name);
msousa@417: 	if (debug) std::cout << "ANY_INT [" << symbol->candidate_datatypes.size()<< "]" << std::endl;
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(hex_integer_c *symbol) {
msousa@417: 	int calc_size;
msousa@417: 
msousa@417: 	calc_size = sizeoftype(symbol);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::bool_type_name))
msousa@417: 	        symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::byte_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::byte_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::word_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::word_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::dword_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::dword_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::lword_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::lword_type_name);
msousa@417: 
msousa@417: 	if (calc_size < sizeoftype(&search_constant_type_c::sint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::sint_type_name);
msousa@417: 	if (calc_size < sizeoftype(&search_constant_type_c::int_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::int_type_name);
msousa@417: 	if (calc_size < sizeoftype(&search_constant_type_c::dint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::dint_type_name);
msousa@417: 	if (calc_size < sizeoftype(&search_constant_type_c::lint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::lint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::usint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::usint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::uint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::uint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::udint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::udint_type_name);
msousa@417: 	if (calc_size <= sizeoftype(&search_constant_type_c::ulint_type_name))
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::ulint_type_name);
msousa@417: 	if (debug) std::cout << "ANY_INT [" << symbol->candidate_datatypes.size()<< "]" << std::endl;
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@427: // SYM_REF2(integer_literal_c, type, value)
msousa@417: void *fill_candidate_datatypes_c::visit(integer_literal_c *symbol) {
msousa@427: 	symbol->value->accept(*this);
conti@445: 	if (search_in_candidate_datatype_list(symbol->type, symbol->value->candidate_datatypes) >= 0)
msousa@427: 		symbol->candidate_datatypes.push_back(symbol->type);
msousa@417: 	if (debug) std::cout << "INT_LITERAL [" << symbol->candidate_datatypes.size() << "]\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(real_literal_c *symbol) {
msousa@427: 	symbol->value->accept(*this);
conti@445: 	if (search_in_candidate_datatype_list(symbol->type, symbol->value->candidate_datatypes) >= 0)
msousa@427: 		symbol->candidate_datatypes.push_back(symbol->type);
msousa@417: 	if (debug) std::cout << "REAL_LITERAL [" << symbol->candidate_datatypes.size() << "]\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(bit_string_literal_c *symbol) {
msousa@427: 	symbol->value->accept(*this);
conti@445: 	if (search_in_candidate_datatype_list(symbol->type, symbol->value->candidate_datatypes) >= 0)
msousa@427: 		symbol->candidate_datatypes.push_back(symbol->type);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(boolean_literal_c *symbol) {
msousa@427:  	symbol->value->accept(*this);
conti@445:  	if (search_in_candidate_datatype_list(symbol->type, symbol->value->candidate_datatypes) >= 0)
msousa@427: 		/* if an explicit datat type has been provided (e.g. SAFEBOOL#true), check whether
msousa@427: 		 * the possible datatypes of the value is consistent with the desired type.
msousa@427: 		 */
msousa@427: 		symbol->candidate_datatypes.push_back(symbol->type);
msousa@427: 	else {
msousa@427: 		/* Then only a literal TRUE or FALSE was given! */
msousa@427: 		/* In this case, symbol->type will be NULL!     */
msousa@427: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@427: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::safebool_type_name);
msousa@427: 	}
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(boolean_true_c *symbol) {
msousa@417: 	symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@427: 	symbol->candidate_datatypes.push_back(&search_constant_type_c::safebool_type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(boolean_false_c *symbol) {
msousa@417: 	symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@427: 	symbol->candidate_datatypes.push_back(&search_constant_type_c::safebool_type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: /*******************************/
msousa@417: /* B.1.2.2   Character Strings */
msousa@417: /*******************************/
msousa@417: void *fill_candidate_datatypes_c::visit(double_byte_character_string_c *symbol) {
msousa@417: 	symbol->candidate_datatypes.push_back(&search_constant_type_c::wstring_type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(single_byte_character_string_c *symbol) {
msousa@417: 	symbol->candidate_datatypes.push_back(&search_constant_type_c::string_type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: /***************************/
msousa@417: /* B 1.2.3 - Time Literals */
msousa@417: /***************************/
msousa@417: /************************/
msousa@417: /* B 1.2.3.1 - Duration */
msousa@417: /************************/
msousa@417: void *fill_candidate_datatypes_c::visit(duration_c *symbol) {
msousa@437: 	/* TODO: check whether the literal follows the rules specified in section '2.2.3.1 Duration' of the standard! */
msousa@417: 	symbol->candidate_datatypes.push_back(symbol->type_name);
msousa@417: 	if (debug) std::cout << "TIME_LITERAL [" << symbol->candidate_datatypes.size() << "]\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: /************************************/
msousa@417: /* B 1.2.3.2 - Time of day and Date */
msousa@417: /************************************/
msousa@417: void *fill_candidate_datatypes_c::visit(time_of_day_c *symbol) {
msousa@417: 	symbol->candidate_datatypes.push_back(symbol->type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(date_c *symbol) {
msousa@417: 	symbol->candidate_datatypes.push_back(symbol->type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(date_and_time_c *symbol) {
msousa@417: 	symbol->candidate_datatypes.push_back(symbol->type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: /**********************/
msousa@417: /* B 1.3 - Data types */
msousa@417: /**********************/
msousa@417: /********************************/
msousa@417: /* B 1.3.3 - Derived data types */
msousa@417: /********************************/
msousa@417: /*  signed_integer DOTDOT signed_integer */
msousa@417: // SYM_REF2(subrange_c, lower_limit, upper_limit)
msousa@417: void *fill_candidate_datatypes_c::visit(subrange_c *symbol) {
msousa@417: 	symbol->lower_limit->accept(*this);
msousa@417: 	symbol->upper_limit->accept(*this);
msousa@417: 	
msousa@417: 	for (unsigned int u = 0; u < symbol->upper_limit->candidate_datatypes.size(); u++) {
msousa@417: 		for(unsigned int l = 0; l < symbol->lower_limit->candidate_datatypes.size(); l++) {
msousa@417: 			if (is_type_equal(symbol->upper_limit->candidate_datatypes[u], symbol->lower_limit->candidate_datatypes[l]))
msousa@417: 				symbol->candidate_datatypes.push_back(symbol->lower_limit->candidate_datatypes[l]);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@443: /*  TYPE type_declaration_list END_TYPE */
msousa@443: // SYM_REF1(data_type_declaration_c, type_declaration_list)
msousa@443: /* NOTE: Not required. already handled by iterator_visitor_c base class */
msousa@443: /*
msousa@417: void *fill_candidate_datatypes_c::visit(data_type_declaration_c *symbol) {
msousa@443: 	symbol->type_declaration_list->accept(*this);
msousa@443: 	return NULL;
msousa@443: }
msousa@443: */
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(enumerated_value_c *symbol) {
msousa@417: 	symbol_c *enumerated_type;
msousa@417: 
msousa@417: 	if (NULL != symbol->type)
msousa@417: 		enumerated_type = symbol->type;
msousa@417: 	else {
msousa@417: 		enumerated_type = enumerated_value_symtable.find_value(symbol->value);
msousa@417: 		if (enumerated_type == enumerated_value_symtable.end_value())
msousa@417: 			enumerated_type = NULL;
msousa@417: 	}
msousa@417: 	enumerated_type = base_type(enumerated_type);
msousa@417: 	if (NULL != enumerated_type)
msousa@417: 		symbol->candidate_datatypes.push_back(enumerated_type);
msousa@417: 
msousa@417: 	if (debug) std::cout << "ENUMERATE [" << symbol->candidate_datatypes.size() << "]\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: /*********************/
msousa@417: /* B 1.4 - Variables */
msousa@417: /*********************/
msousa@417: void *fill_candidate_datatypes_c::visit(symbolic_variable_c *symbol) {
msousa@417: 	symbol_c *result = search_varfb_instance_type->get_basetype_decl(symbol);
msousa@417: 	if (NULL != result)
msousa@417: 		symbol->candidate_datatypes.push_back(result);
msousa@417: 	if (debug) std::cout << "VAR [" << symbol->candidate_datatypes.size() << "]\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: /********************************************/
msousa@417: /* B 1.4.1 - Directly Represented Variables */
msousa@417: /********************************************/
msousa@417: void *fill_candidate_datatypes_c::visit(direct_variable_c *symbol) {
msousa@417: 	/* Comment added by mario:
msousa@417: 	 * The following code is safe, actually, as the lexical parser guarantees the correct IEC61131-3 syntax was used.
msousa@417: 	 */
msousa@417: 	/* However, we should probably add an assertion in case we later change the lexical parser! */
msousa@417: 	/* if (symbol->value == NULL) ERROR;
msousa@417: 	 * if (symbol->value[0] == '\0') ERROR;
msousa@417: 	 * if (symbol->value[1] == '\0') ERROR;
msousa@417: 	 */
msousa@417: 	switch (symbol->value[2]) {
msousa@417: 	case 'X': // bit - 1 bit
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 		break;
msousa@417: 
msousa@417: 	case 'B': // byte - 8 bits
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::byte_type_name);
msousa@417: 		break;
msousa@417: 
msousa@417: 	case 'W': // word - 16 bits
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::word_type_name);
msousa@417: 		break;
msousa@417: 
msousa@417: 	case 'D': // double word - 32 bits
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::dword_type_name);
msousa@417: 		break;
msousa@417: 
msousa@417: 	case 'L': // long word - 64 bits
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::lword_type_name);
msousa@417: 		break;
msousa@417: 
msousa@417: 	default:  // if none of the above, then the empty string was used <=> boolean
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 		break;
msousa@417: 	}
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: /*************************************/
msousa@417: /* B 1.4.2 - Multi-element variables */
msousa@417: /*************************************/
msousa@417: /*  subscripted_variable '[' subscript_list ']' */
msousa@417: // SYM_REF2(array_variable_c, subscripted_variable, subscript_list)
msousa@417: void *fill_candidate_datatypes_c::visit(array_variable_c *symbol) {
msousa@417: 	/* get the declaration of the data type __stored__ in the array... */
msousa@417: 	/* if we were to want the data type of the array itself, then we should call_param_name
msousa@417: 	 * search_varfb_instance_type->get_basetype_decl(symbol->subscripted_variable)
msousa@417: 	 */
msousa@417: 	symbol_c *result = search_varfb_instance_type->get_basetype_decl(symbol);
msousa@417: 	if (NULL != result) symbol->candidate_datatypes.push_back(result);
msousa@417: 	
msousa@417: 	/* recursively call the subscript list, so we can check the data types of the expressions used for the subscripts */
msousa@417: 	symbol->subscript_list->accept(*this);
msousa@417: 
msousa@417: 	if (debug) std::cout << "ARRAY_VAR [" << symbol->candidate_datatypes.size() << "]\n";	
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: /* subscript_list ',' subscript */
msousa@417: // SYM_LIST(subscript_list_c)
msousa@417: /* NOTE: we inherit from iterator visitor, so we do not need to implement this method... */
msousa@417: #if 0
msousa@417: void *fill_candidate_datatypes_c::visit(subscript_list_c *symbol) {
msousa@417: }
msousa@417: #endif
msousa@417: 
msousa@417: 
msousa@417: /*  record_variable '.' field_selector */
msousa@417: /*  WARNING: input and/or output variables of function blocks
msousa@417:  *           may be accessed as fields of a structured variable!
msousa@417:  *           Code handling a structured_variable_c must take
msousa@417:  *           this into account!
msousa@417:  */
msousa@417: // SYM_REF2(structured_variable_c, record_variable, field_selector)
msousa@417: /* NOTE: We do not need to recursively determine the data types of each field_selector, as the search_varfb_instance_type
msousa@417:  * will do that for us. So we determine the candidate datatypes only for the full structured_variable.
msousa@417:  */
msousa@417: void *fill_candidate_datatypes_c::visit(structured_variable_c *symbol) {
msousa@417: 	symbol_c *result = search_varfb_instance_type->get_basetype_decl(symbol);
msousa@417: 	if (NULL != result) symbol->candidate_datatypes.push_back(result);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: /************************************/
msousa@417: /* B 1.5 Program organization units */
msousa@417: /************************************/
msousa@417: /*********************/
msousa@417: /* B 1.5.1 Functions */
msousa@417: /*********************/
msousa@417: void *fill_candidate_datatypes_c::visit(function_declaration_c *symbol) {
msousa@417: 	search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
msousa@417: 	symbol->var_declarations_list->accept(*this);
msousa@417: 	if (debug) printf("Filling candidate data types list in body of function %s\n", ((token_c *)(symbol->derived_function_name))->value);
msousa@417: 	il_parenthesis_level = 0;
msousa@417: 	symbol->function_body->accept(*this);
msousa@417: 	delete search_varfb_instance_type;
msousa@417: 	search_varfb_instance_type = NULL;
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: /***************************/
msousa@417: /* B 1.5.2 Function blocks */
msousa@417: /***************************/
msousa@417: void *fill_candidate_datatypes_c::visit(function_block_declaration_c *symbol) {
msousa@417: 	search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
msousa@417: 	symbol->var_declarations->accept(*this);
msousa@417: 	if (debug) printf("Filling candidate data types list in body of FB %s\n", ((token_c *)(symbol->fblock_name))->value);
msousa@417: 	il_parenthesis_level = 0;
msousa@417: 	symbol->fblock_body->accept(*this);
msousa@417: 	delete search_varfb_instance_type;
msousa@417: 	search_varfb_instance_type = NULL;
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: /**********************/
msousa@417: /* B 1.5.3 - Programs */
msousa@417: /**********************/
msousa@417: void *fill_candidate_datatypes_c::visit(program_declaration_c *symbol) {
msousa@417: 	search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
msousa@417: 	symbol->var_declarations->accept(*this);
msousa@417: 	if (debug) printf("Filling candidate data types list in body of program %s\n", ((token_c *)(symbol->program_type_name))->value);
msousa@417: 	il_parenthesis_level = 0;
msousa@417: 	symbol->function_block_body->accept(*this);
msousa@417: 	delete search_varfb_instance_type;
msousa@417: 	search_varfb_instance_type = NULL;
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: 
msousa@417: /********************************/
msousa@417: /* B 1.7 Configuration elements */
msousa@417: /********************************/
msousa@417: void *fill_candidate_datatypes_c::visit(configuration_declaration_c *symbol) {
msousa@417: #if 0
msousa@417: 	// TODO !!!
msousa@417: 	/* for the moment we must return NULL so semantic analysis of remaining code is not interrupted! */
msousa@417: #endif
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: /****************************************/
msousa@417: /* B.2 - Language IL (Instruction List) */
msousa@417: /****************************************/
msousa@417: /***********************************/
msousa@417: /* B 2.1 Instructions and Operands */
msousa@417: /***********************************/
msousa@443: 
msousa@443: /*| instruction_list il_instruction */
msousa@443: // SYM_LIST(instruction_list_c)
msousa@417: // void *visit(instruction_list_c *symbol);
msousa@443: 
msousa@443: 
msousa@443: /* | label ':' [il_incomplete_instruction] eol_list */
msousa@443: // SYM_REF2(il_instruction_c, label, il_instruction)
msousa@443: // void *visit(instruction_list_c *symbol);
msousa@443: void *fill_candidate_datatypes_c::visit(il_instruction_c *symbol) {
msousa@448: 	if (NULL == symbol->il_instruction) {
msousa@450: 		/* This empty/null il_instruction does not change the value of the current/default IL variable.
msousa@450: 		 * So it inherits the candidate_datatypes from it's previous IL instructions!
msousa@450: 		 */
msousa@450: 		if (NULL != symbol->prev_il_instruction)
msousa@450: 			copy_candidate_datatype_list(symbol->prev_il_instruction /*from*/, symbol /*to*/);	
msousa@448: 	} else {
msousa@448: 		prev_il_instruction = symbol->prev_il_instruction;
msousa@448: 		symbol->il_instruction->accept(*this);
msousa@448: 		prev_il_instruction = NULL;
msousa@448: 
msousa@448: 		/* This object has (inherits) the same candidate datatypes as the il_instruction */
msousa@448: 		copy_candidate_datatype_list(symbol->il_instruction /*from*/, symbol /*to*/);	
msousa@448: 	}
msousa@443: 
msousa@443: 	return NULL;
msousa@443: }
msousa@443: 
msousa@443: 
msousa@443: 
msousa@417: void *fill_candidate_datatypes_c::visit(il_simple_operation_c *symbol) {
msousa@417: 	/* determine the data type of the operand */
msousa@417: 	if (NULL != symbol->il_operand) {
msousa@417: 		symbol->il_operand->accept(*this);
msousa@417: 	}
msousa@417: 	/* recursive call to fill the candidate data types list */
msousa@417: 	il_operand = symbol->il_operand;
msousa@417: 	symbol->il_simple_operator->accept(*this);
msousa@417: 	il_operand = NULL;
msousa@443: 	/* This object has (inherits) the same candidate datatypes as the il_simple_operator */
msousa@443: 	copy_candidate_datatype_list(symbol->il_simple_operator /*from*/, symbol /*to*/);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@438: 
msousa@438: /* | function_name [il_operand_list] */
msousa@438: /* NOTE: The parameters 'called_function_declaration' and 'extensible_param_count' are used to pass data between the stage 3 and stage 4. */
msousa@438: // SYM_REF2(il_function_call_c, function_name, il_operand_list, symbol_c *called_function_declaration; int extensible_param_count;)
msousa@417: void *fill_candidate_datatypes_c::visit(il_function_call_c *symbol) {
msousa@438: 	/* The first parameter of a non formal function call in IL will be the 'current value' (i.e. the prev_il_instruction)
msousa@438: 	 * In order to be able to handle this without coding special cases, we will simply prepend that symbol
msousa@438: 	 * to the il_operand_list, and remove it later (in the print_datatypes_error_c).
msousa@438: 	 *
msousa@438: 	 * However, if no further paramters are given, then il_operand_list will be NULL, and we will
msousa@438: 	 * need to create a new object to hold the pointer to prev_il_instruction.
msousa@438: 	 * This change will also be undone later in print_datatypes_error_c.
msousa@438: 	 */
msousa@438: 	if (NULL == symbol->il_operand_list)  symbol->il_operand_list = new il_operand_list_c;
msousa@438: 	if (NULL == symbol->il_operand_list)  ERROR;
msousa@438: 
msousa@438: 	symbol->il_operand_list->accept(*this);
msousa@438: 
msousa@438: 	if (NULL == prev_il_instruction)      return NULL;
msousa@438: 	((list_c *)symbol->il_operand_list)->insert_element(prev_il_instruction, 0);	
msousa@438: 
msousa@438: 	generic_function_call_t fcall_param = {
msousa@441: 		/* fcall_param.function_name               = */ symbol->function_name,
msousa@441: 		/* fcall_param.nonformal_operand_list      = */ symbol->il_operand_list,
msousa@441: 		/* fcall_param.formal_operand_list         = */ NULL,
msousa@441: 		/* enum {POU_FB, POU_function} POU_type    = */ generic_function_call_t::POU_function,
msousa@441: 		/* fcall_param.candidate_functions         = */ symbol->candidate_functions,
msousa@441: 		/* fcall_param.called_function_declaration = */ symbol->called_function_declaration,
msousa@441: 		/* fcall_param.extensible_param_count      = */ symbol->extensible_param_count
msousa@438: 	};
msousa@438: 	handle_function_call(symbol, fcall_param);
msousa@438: 
msousa@438: 	if (debug) std::cout << "il_function_call_c [" << symbol->candidate_datatypes.size() << "] result.\n";
msousa@438: 	return NULL;
msousa@438: }
msousa@438: 
msousa@438: 
msousa@417: /* | il_expr_operator '(' [il_operand] eol_list [simple_instr_list] ')' */
msousa@417: // SYM_REF3(il_expression_c, il_expr_operator, il_operand, simple_instr_list);
msousa@417: void *fill_candidate_datatypes_c::visit(il_expression_c *symbol) {
msousa@417:   if (NULL != symbol->il_operand)
msousa@417:     symbol->il_operand->accept(*this);
msousa@417:   
msousa@417:   il_parenthesis_level++;
msousa@417: 
msousa@417:   /* Note that prev_il_instruction will actually be used to get the current value store in the il_default_variable */
msousa@417:   /* If a symbol->il_operand is provided, then that will be the result before executing the simple_instr_list.
msousa@417:    * If this symbol is NULL, then the current result is also NULL, which is correct for what we want to do!
msousa@417:    */
msousa@417:   symbol_c *prev_il_instruction_backup = prev_il_instruction;
msousa@417:   prev_il_instruction = symbol->il_operand;
msousa@417:   
msousa@417:   if(symbol->simple_instr_list != NULL) {
msousa@417:     symbol->simple_instr_list->accept(*this);
msousa@417:   }
msousa@417: 
msousa@417:   il_parenthesis_level--;
msousa@417:   if (il_parenthesis_level < 0) ERROR;
msousa@417: 
msousa@417:   /* Now check the if the data type semantics of operation are correct,  */
msousa@417:   il_operand = prev_il_instruction;
msousa@417:   prev_il_instruction = prev_il_instruction_backup;
msousa@417:   symbol->il_expr_operator->accept(*this);
msousa@417:   il_operand = NULL;
msousa@417:   return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(il_jump_operation_c *symbol) {
msousa@417:   /* recursive call to fill the candidate data types list */
msousa@417:   il_operand = NULL;
msousa@417:   symbol->il_jump_operator->accept(*this);
msousa@417:   il_operand = NULL;
msousa@417:   return NULL;
msousa@417: }
msousa@417: 
msousa@439: 
msousa@439: /*   il_call_operator prev_declared_fb_name
msousa@439:  * | il_call_operator prev_declared_fb_name '(' ')'
msousa@439:  * | il_call_operator prev_declared_fb_name '(' eol_list ')'
msousa@439:  * | il_call_operator prev_declared_fb_name '(' il_operand_list ')'
msousa@439:  * | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')'
msousa@439:  */
msousa@439: /* NOTE: The parameter 'called_fb_declaration'is used to pass data between stage 3 and stage4 (although currently it is not used in stage 4 */
msousa@439: // SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list, symbol_c *called_fb_declaration)
msousa@417: void *fill_candidate_datatypes_c::visit(il_fb_call_c *symbol) {
msousa@439: 	bool compatible = false;
msousa@439: 	symbol_c *fb_decl = search_varfb_instance_type->get_basetype_decl(symbol->fb_name);
msousa@439: 	/* Although a call to a non-declared FB is a semantic error, this is currently caught by stage 2! */
msousa@439: 	if (NULL == fb_decl) ERROR;
msousa@439: 
msousa@439: 	if (symbol->  il_param_list != NULL) {
msousa@439: 		symbol->il_param_list->accept(*this);
msousa@439: 		compatible = match_formal_call(symbol, fb_decl);
msousa@439: 	}
msousa@439: 	if (symbol->il_operand_list != NULL) {
msousa@439: 		symbol->il_operand_list->accept(*this);
msousa@439: 		compatible = match_nonformal_call(symbol, fb_decl);
msousa@439: 	}
msousa@439: 
msousa@439: 	/* The print_datatypes_error_c does not rely on this called_fb_declaration pointer being != NULL to conclude that
msousa@439: 	 * we have a datat type incompatibility error, so setting it to the correct fb_decl is actually safe,
msousa@439: 	 * as the compiler will never reach the compilation stage!
msousa@439: 	 */
msousa@439: 	symbol->called_fb_declaration = fb_decl;
msousa@439: 
msousa@450: 	/* This object has the same candidate datatypes as the prev_il_instruction, since it does not change the value stored in the current/default IL variable. */
msousa@450: 	copy_candidate_datatype_list(prev_il_instruction/*from*/, symbol/*to*/);
msousa@450: 
msousa@439: 	if (debug) std::cout << "FB [] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@439: 	return NULL;
msousa@439: }
msousa@439: 
msousa@417: 
msousa@438: /* | function_name '(' eol_list [il_param_list] ')' */
msousa@438: /* NOTE: The parameter 'called_function_declaration' is used to pass data between the stage 3 and stage 4. */
msousa@438: // SYM_REF2(il_formal_funct_call_c, function_name, il_param_list, symbol_c *called_function_declaration; int extensible_param_count;)
msousa@417: void *fill_candidate_datatypes_c::visit(il_formal_funct_call_c *symbol) {
msousa@438: 	symbol->il_param_list->accept(*this);
msousa@438: 
msousa@438: 	generic_function_call_t fcall_param = {
msousa@441: 		/* fcall_param.function_name               = */ symbol->function_name,
msousa@441: 		/* fcall_param.nonformal_operand_list      = */ NULL,
msousa@441: 		/* fcall_param.formal_operand_list         = */ symbol->il_param_list,
msousa@441: 		/* enum {POU_FB, POU_function} POU_type    = */ generic_function_call_t::POU_function,
msousa@441: 		/* fcall_param.candidate_functions         = */ symbol->candidate_functions,
msousa@441: 		/* fcall_param.called_function_declaration = */ symbol->called_function_declaration,
msousa@441: 		/* fcall_param.extensible_param_count      = */ symbol->extensible_param_count
msousa@438: 	};
msousa@438: 	handle_function_call(symbol, fcall_param);
msousa@438: 
msousa@438: 	if (debug) std::cout << "il_formal_funct_call_c [" << symbol->candidate_datatypes.size() << "] result.\n";
msousa@438: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: /*
msousa@417:     void *visit(il_operand_list_c *symbol);
msousa@417:     void *visit(simple_instr_list_c *symbol);
msousa@417:     void *visit(il_param_list_c *symbol);
msousa@417:     void *visit(il_param_assignment_c *symbol);
msousa@417:     void *visit(il_param_out_assignment_c *symbol);
msousa@417: */
msousa@417: 
msousa@417: /*******************/
msousa@417: /* B 2.2 Operators */
msousa@417: /*******************/
msousa@417: void *fill_candidate_datatypes_c::visit(LD_operator_c *symbol) {
msousa@417: 	for(unsigned int i = 0; i < il_operand->candidate_datatypes.size(); i++) {
msousa@417: 		symbol->candidate_datatypes.push_back(il_operand->candidate_datatypes[i]);
msousa@417: 	}
msousa@417: 	if (debug) std::cout << "LD [" <<  il_operand->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(LDN_operator_c *symbol) {
msousa@417: 	for(unsigned int i = 0; i < il_operand->candidate_datatypes.size(); i++) {
msousa@417: 		if      (is_ANY_BIT_compatible(il_operand->candidate_datatypes[i]))
msousa@417: 			symbol->candidate_datatypes.push_back(il_operand->candidate_datatypes[i]);
msousa@417: 	}
msousa@417: 	if (debug) std::cout << "LDN [" << il_operand->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(ST_operator_c *symbol) {
msousa@417: 	symbol_c *prev_instruction_type, *operand_type;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			prev_instruction_type = prev_il_instruction->candidate_datatypes[i];
msousa@417: 			operand_type = il_operand->candidate_datatypes[j];
conti@440: 			if (is_type_equal(prev_instruction_type, operand_type))
msousa@417: 				symbol->candidate_datatypes.push_back(prev_instruction_type);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (debug) std::cout << "ST [" << prev_il_instruction->candidate_datatypes.size() << "," << il_operand->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(STN_operator_c *symbol) {
msousa@417: 	symbol_c *prev_instruction_type, *operand_type;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			prev_instruction_type = prev_il_instruction->candidate_datatypes[i];
msousa@417: 			operand_type = il_operand->candidate_datatypes[j];
conti@440: 			if (is_type_equal(prev_instruction_type,operand_type) && is_ANY_BIT_compatible(operand_type))
msousa@417: 				symbol->candidate_datatypes.push_back(prev_instruction_type);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (debug) std::cout << "STN [" << prev_il_instruction->candidate_datatypes.size() << "," << il_operand->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(NOT_operator_c *symbol) {
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@447: 
msousa@417: void *fill_candidate_datatypes_c::visit(S_operator_c *symbol) {
msousa@447:   /* TODO: what if this is a FB call ?? */
msousa@417: 	symbol_c *prev_instruction_type, *operand_type;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			prev_instruction_type = prev_il_instruction->candidate_datatypes[i];
msousa@417: 			operand_type = il_operand->candidate_datatypes[j];
conti@440: 			if (is_type_equal(prev_instruction_type,operand_type) && is_ANY_BOOL_compatible(operand_type))
msousa@417: 				symbol->candidate_datatypes.push_back(prev_instruction_type);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (debug) std::cout << "S [" << prev_il_instruction->candidate_datatypes.size() << "," << il_operand->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@447: 
msousa@417: void *fill_candidate_datatypes_c::visit(R_operator_c *symbol) {
msousa@447:   /* TODO: what if this is a FB call ?? */
msousa@417: 	symbol_c *prev_instruction_type, *operand_type;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			prev_instruction_type = prev_il_instruction->candidate_datatypes[i];
msousa@417: 			operand_type = il_operand->candidate_datatypes[j];
conti@440: 			if (is_type_equal(prev_instruction_type,operand_type) && is_ANY_BOOL_compatible(operand_type))
msousa@417: 				symbol->candidate_datatypes.push_back(prev_instruction_type);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (debug) std::cout << "R [" << prev_il_instruction->candidate_datatypes.size() << "," << il_operand->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@447: 
msousa@417: void *fill_candidate_datatypes_c::visit(S1_operator_c *symbol) {
msousa@447: 	handle_implicit_il_fb_call(symbol, "S1", symbol->called_fb_declaration);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(R1_operator_c *symbol) {
msousa@447: 	handle_implicit_il_fb_call(symbol, "R1", symbol->called_fb_declaration);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(CLK_operator_c *symbol) {
msousa@447: 	handle_implicit_il_fb_call(symbol, "CLK", symbol->called_fb_declaration);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(CU_operator_c *symbol) {
msousa@447: 	handle_implicit_il_fb_call(symbol, "CU", symbol->called_fb_declaration);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(CD_operator_c *symbol) {
msousa@447: 	handle_implicit_il_fb_call(symbol, "CD", symbol->called_fb_declaration);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(PV_operator_c *symbol) {
msousa@447: 	handle_implicit_il_fb_call(symbol, "PV", symbol->called_fb_declaration);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(IN_operator_c *symbol) {
msousa@447: 	handle_implicit_il_fb_call(symbol, "IN", symbol->called_fb_declaration);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(PT_operator_c *symbol) {
msousa@447: 	handle_implicit_il_fb_call(symbol, "PT", symbol->called_fb_declaration);
msousa@447: 	return NULL;
msousa@447: }
msousa@447: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(AND_operator_c *symbol) {
msousa@417: 	symbol_c *prev_instruction_type, *operand_type;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			prev_instruction_type = prev_il_instruction->candidate_datatypes[i];
msousa@417: 			operand_type = il_operand->candidate_datatypes[j];
msousa@417: 			if (is_type_equal(prev_instruction_type, operand_type) &&
msousa@417: 					is_ANY_BIT_compatible(operand_type))
msousa@417: 				symbol->candidate_datatypes.push_back(prev_instruction_type);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(OR_operator_c *symbol) {
msousa@417: 	symbol_c *prev_instruction_type, *operand_type;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			prev_instruction_type = prev_il_instruction->candidate_datatypes[i];
msousa@417: 			operand_type = il_operand->candidate_datatypes[j];
msousa@417: 			if (is_type_equal(prev_instruction_type, operand_type) &&
msousa@417: 					is_ANY_BIT_compatible(operand_type))
msousa@417: 				symbol->candidate_datatypes.push_back(prev_instruction_type);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(XOR_operator_c *symbol) {
msousa@417: 	symbol_c *prev_instruction_type, *operand_type;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			prev_instruction_type = prev_il_instruction->candidate_datatypes[i];
msousa@417: 			operand_type = il_operand->candidate_datatypes[j];
msousa@417: 			if (is_type_equal(prev_instruction_type, operand_type) &&
msousa@417: 					is_ANY_BIT_compatible(operand_type))
msousa@417: 				symbol->candidate_datatypes.push_back(prev_instruction_type);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(ANDN_operator_c *symbol) {
msousa@417: 	symbol_c *prev_instruction_type, *operand_type;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			prev_instruction_type = prev_il_instruction->candidate_datatypes[i];
msousa@417: 			operand_type = il_operand->candidate_datatypes[j];
msousa@417: 			if (is_type_equal(prev_instruction_type, operand_type) &&
msousa@417: 					is_ANY_BIT_compatible(operand_type))
msousa@417: 				symbol->candidate_datatypes.push_back(prev_instruction_type);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(ORN_operator_c *symbol) {
msousa@417: 	symbol_c *prev_instruction_type, *operand_type;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			prev_instruction_type = prev_il_instruction->candidate_datatypes[i];
msousa@417: 			operand_type = il_operand->candidate_datatypes[j];
msousa@417: 			if (is_type_equal(prev_instruction_type, operand_type) &&
msousa@417: 					is_ANY_BIT_compatible(operand_type))
msousa@417: 				symbol->candidate_datatypes.push_back(prev_instruction_type);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(XORN_operator_c *symbol) {
msousa@417: 	symbol_c *prev_instruction_type, *operand_type;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			prev_instruction_type = prev_il_instruction->candidate_datatypes[i];
msousa@417: 			operand_type = il_operand->candidate_datatypes[j];
msousa@417: 			if (is_type_equal(prev_instruction_type, operand_type) &&
msousa@417: 					is_ANY_BIT_compatible(operand_type))
msousa@417: 				symbol->candidate_datatypes.push_back(prev_instruction_type);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(ADD_operator_c *symbol) {
msousa@417: 	symbol_c *prev_instruction_type, *operand_type;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for(unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			prev_instruction_type = prev_il_instruction->candidate_datatypes[i];
msousa@417: 			operand_type = il_operand->candidate_datatypes[j];
msousa@417: 			if (is_type_equal(prev_instruction_type, operand_type) &&
msousa@417: 					is_ANY_NUM_compatible(prev_instruction_type))
msousa@417: 				symbol->candidate_datatypes.push_back(prev_instruction_type);
msousa@417: 			else {
msousa@417: 				symbol_c *result = widening_conversion(prev_instruction_type, operand_type, widen_ADD_table);
msousa@417: 				if (result)
msousa@417: 					symbol->candidate_datatypes.push_back(result);
msousa@417: 
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (debug) std::cout <<  "ADD [" << prev_il_instruction->candidate_datatypes.size() << "," << il_operand->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(SUB_operator_c *symbol) {
msousa@417: 	symbol_c *prev_instruction_type, *operand_type;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for(unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			prev_instruction_type = prev_il_instruction->candidate_datatypes[i];
msousa@417: 			operand_type = il_operand->candidate_datatypes[j];
msousa@417: 			if (is_type_equal(prev_instruction_type, operand_type) &&
msousa@417: 					is_ANY_NUM_compatible(prev_instruction_type))
msousa@417: 				symbol->candidate_datatypes.push_back(prev_instruction_type);
msousa@417: 			else {
msousa@417: 				symbol_c *result = widening_conversion(prev_instruction_type, operand_type, widen_SUB_table);
msousa@417: 				if (result)
msousa@417: 					symbol->candidate_datatypes.push_back(result);
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (debug) std::cout <<  "SUB [" << prev_il_instruction->candidate_datatypes.size() << "," << il_operand->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(MUL_operator_c *symbol) {
msousa@417: 	symbol_c *prev_instruction_type, *operand_type;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for(unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			prev_instruction_type = prev_il_instruction->candidate_datatypes[i];
msousa@417: 			operand_type = il_operand->candidate_datatypes[j];
msousa@417: 			if (is_type_equal(prev_instruction_type, operand_type) &&
msousa@417: 					is_ANY_NUM_compatible(prev_instruction_type))
msousa@417: 				symbol->candidate_datatypes.push_back(prev_instruction_type);
msousa@417: 			else {
msousa@417: 				symbol_c *result = widening_conversion(prev_instruction_type, operand_type, widen_MUL_table);
msousa@417: 				if (result)
msousa@417: 					symbol->candidate_datatypes.push_back(result);
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (debug) std::cout <<  "MUL [" << prev_il_instruction->candidate_datatypes.size() << "," << il_operand->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(DIV_operator_c *symbol) {
msousa@417: 	symbol_c *prev_instruction_type, *operand_type;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for(unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			prev_instruction_type = prev_il_instruction->candidate_datatypes[i];
msousa@417: 			operand_type = il_operand->candidate_datatypes[j];
msousa@417: 			if (is_type_equal(prev_instruction_type, operand_type) &&
msousa@417: 					is_ANY_NUM_compatible(prev_instruction_type))
msousa@417: 				symbol->candidate_datatypes.push_back(prev_instruction_type);
msousa@417: 			else {
msousa@417: 				symbol_c *result = widening_conversion(prev_instruction_type, operand_type, widen_DIV_table);
msousa@417: 				if (result)
msousa@417: 					symbol->candidate_datatypes.push_back(result);
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (debug) std::cout <<  "DIV [" << prev_il_instruction->candidate_datatypes.size() << "," << il_operand->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(MOD_operator_c *symbol) {
msousa@417: 	symbol_c *prev_instruction_type, *operand_type;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for(unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			prev_instruction_type = prev_il_instruction->candidate_datatypes[i];
msousa@417: 			operand_type = il_operand->candidate_datatypes[j];
msousa@417: 			if (is_type_equal(prev_instruction_type, operand_type) &&
msousa@417: 					is_ANY_INT_compatible(prev_instruction_type))
msousa@417: 				symbol->candidate_datatypes.push_back(prev_instruction_type);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (debug) std::cout <<  "MOD [" << prev_il_instruction->candidate_datatypes.size() << "," << il_operand->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(GT_operator_c *symbol) {
msousa@417: 	bool found = false;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for(unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			if (is_type_equal(prev_il_instruction->candidate_datatypes[i], il_operand->candidate_datatypes[j])
msousa@417: 					&& is_ANY_ELEMENTARY_compatible(prev_il_instruction->candidate_datatypes[i])) {
msousa@417: 				found = true;
msousa@417: 				break;
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (found) symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(GE_operator_c *symbol) {
msousa@417: 	bool found = false;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for(unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			if (is_type_equal(prev_il_instruction->candidate_datatypes[i], il_operand->candidate_datatypes[j])
msousa@417: 					&& is_ANY_ELEMENTARY_compatible(prev_il_instruction->candidate_datatypes[i])) {
msousa@417: 				found = true;
msousa@417: 				break;
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (found) symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(EQ_operator_c *symbol) {
msousa@417: 	bool found = false;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for(unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			if (is_type_equal(prev_il_instruction->candidate_datatypes[i], il_operand->candidate_datatypes[j])
msousa@417: 					&& is_ANY_ELEMENTARY_compatible(prev_il_instruction->candidate_datatypes[i])) {
msousa@417: 				found = true;
msousa@417: 				break;
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (found) symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(LT_operator_c *symbol) {
msousa@417: 	bool found = false;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for(unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			if (is_type_equal(prev_il_instruction->candidate_datatypes[i], il_operand->candidate_datatypes[j])
msousa@417: 					&& is_ANY_ELEMENTARY_compatible(prev_il_instruction->candidate_datatypes[i])) {
msousa@417: 				found = true;
msousa@417: 				break;
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (found) symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(LE_operator_c *symbol) {
msousa@417: 	bool found = false;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for(unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			if (is_type_equal(prev_il_instruction->candidate_datatypes[i], il_operand->candidate_datatypes[j])
msousa@417: 					&& is_ANY_ELEMENTARY_compatible(prev_il_instruction->candidate_datatypes[i])) {
msousa@417: 				found = true;
msousa@417: 				break;
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (found) symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(NE_operator_c *symbol) {
msousa@417: 	bool found = false;
msousa@417: 
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for(unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
msousa@417: 			if (is_type_equal(prev_il_instruction->candidate_datatypes[i], il_operand->candidate_datatypes[j])
msousa@417: 					&& is_ANY_ELEMENTARY_compatible(prev_il_instruction->candidate_datatypes[i])) {
msousa@417: 				found = true;
msousa@417: 				break;
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (found) symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(CAL_operator_c *symbol) {
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 	        /* does not need to be bool type !! */
msousa@417: 		symbol->candidate_datatypes.push_back(prev_il_instruction->candidate_datatypes[i]);
msousa@417: 	}
msousa@417: 	if (debug) std::cout <<  "CAL [" << prev_il_instruction->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(CALC_operator_c *symbol) {
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		if (is_type(prev_il_instruction->candidate_datatypes[i], bool_type_name_c))
msousa@417: 			symbol->candidate_datatypes.push_back(prev_il_instruction->candidate_datatypes[i]);
msousa@417: 	}
msousa@417: 	if (debug) std::cout <<  "CALC [" << prev_il_instruction->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(CALCN_operator_c *symbol) {
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		if (is_type(prev_il_instruction->candidate_datatypes[i], bool_type_name_c))
msousa@417: 			symbol->candidate_datatypes.push_back(prev_il_instruction->candidate_datatypes[i]);
msousa@417: 	}
msousa@417: 	if (debug) std::cout <<  "CALCN [" << prev_il_instruction->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(RET_operator_c *symbol) {
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 	        /* does not need to be bool type !! */
msousa@417: 		symbol->candidate_datatypes.push_back(prev_il_instruction->candidate_datatypes[i]);
msousa@417: 	}
msousa@417: 	if (debug) std::cout <<  "RET [" << prev_il_instruction->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(RETC_operator_c *symbol) {
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		if (is_type(prev_il_instruction->candidate_datatypes[i], bool_type_name_c))
msousa@417: 			symbol->candidate_datatypes.push_back(prev_il_instruction->candidate_datatypes[i]);
msousa@417: 	}
msousa@417: 	if (debug) std::cout <<  "RETC [" << prev_il_instruction->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(RETCN_operator_c *symbol) {
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		if (is_type(prev_il_instruction->candidate_datatypes[i], bool_type_name_c))
msousa@417: 			symbol->candidate_datatypes.push_back(prev_il_instruction->candidate_datatypes[i]);
msousa@417: 	}
msousa@417: 	if (debug) std::cout <<  "RETCN [" << prev_il_instruction->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(JMP_operator_c *symbol) {
msousa@417: 	if (NULL == prev_il_instruction) return NULL;
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 	        /* does not need to be bool type !! */
msousa@417: 		symbol->candidate_datatypes.push_back(prev_il_instruction->candidate_datatypes[i]);
msousa@417: 	}
msousa@417: 	if (debug) std::cout <<  "JMP [" << prev_il_instruction->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(JMPC_operator_c *symbol) {
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		if (is_type(prev_il_instruction->candidate_datatypes[i], bool_type_name_c))
msousa@417: 			symbol->candidate_datatypes.push_back(prev_il_instruction->candidate_datatypes[i]);
msousa@417: 	}
msousa@417: 	if (debug) std::cout <<  "JMPC [" << prev_il_instruction->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(JMPCN_operator_c *symbol) {
msousa@417: 	for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@417: 		if (is_type(prev_il_instruction->candidate_datatypes[i], bool_type_name_c))
msousa@417: 			symbol->candidate_datatypes.push_back(prev_il_instruction->candidate_datatypes[i]);
msousa@417: 	}
msousa@417: 	if (debug) std::cout <<  "JMPCN [" << prev_il_instruction->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: /* Symbol class handled together with function call checks */
msousa@417: // void *visit(il_assign_operator_c *symbol, variable_name);
msousa@417: /* Symbol class handled together with function call checks */
msousa@417: // void *visit(il_assign_operator_c *symbol, option, variable_name);
msousa@417: 
msousa@417: /***************************************/
msousa@417: /* B.3 - Language ST (Structured Text) */
msousa@417: /***************************************/
msousa@417: /***********************/
msousa@417: /* B 3.1 - Expressions */
msousa@417: /***********************/
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(or_expression_c *symbol) {
msousa@417: 	symbol->l_exp->accept(*this);
msousa@417: 	symbol->r_exp->accept(*this);
msousa@417: 	for (unsigned  int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		for (unsigned  int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: 			if (is_type_equal(symbol->l_exp->candidate_datatypes[i], symbol->r_exp->candidate_datatypes[j])
msousa@417: 					&& is_ANY_BIT_compatible(symbol->l_exp->candidate_datatypes[i]))
msousa@417: 				symbol->candidate_datatypes.push_back(symbol->l_exp->candidate_datatypes[i]);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(xor_expression_c *symbol) {
msousa@417: 	symbol->l_exp->accept(*this);
msousa@417: 	symbol->r_exp->accept(*this);
msousa@417: 
msousa@417: 	for (unsigned  int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		for (unsigned  int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: 			if (is_type_equal(symbol->l_exp->candidate_datatypes[i], symbol->r_exp->candidate_datatypes[j])
msousa@417: 					&& is_ANY_BIT_compatible(symbol->l_exp->candidate_datatypes[i]))
msousa@417: 				symbol->candidate_datatypes.push_back(symbol->l_exp->candidate_datatypes[i]);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(and_expression_c *symbol) {
msousa@417: 	symbol->l_exp->accept(*this);
msousa@417: 	symbol->r_exp->accept(*this);
msousa@417: 
msousa@417: 	for (unsigned  int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		for (unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: 			if (is_type_equal(symbol->l_exp->candidate_datatypes[i], symbol->r_exp->candidate_datatypes[j])
msousa@417: 					&& is_ANY_BIT_compatible(symbol->l_exp->candidate_datatypes[i]))
msousa@417: 				symbol->candidate_datatypes.push_back(symbol->l_exp->candidate_datatypes[i]);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(equ_expression_c *symbol) {
msousa@417: 	symbol->l_exp->accept(*this);
msousa@417: 	symbol->r_exp->accept(*this);
msousa@417: 	bool found = false;
msousa@417: 
msousa@417: 	for (unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		for (unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: 			if (is_type_equal(symbol->l_exp->candidate_datatypes[i], symbol->r_exp->candidate_datatypes[j])
msousa@417: 					&& is_ANY_ELEMENTARY_compatible(symbol->l_exp->candidate_datatypes[i])) {
msousa@417: 				found = true;
msousa@417: 				break;
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (found) symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(notequ_expression_c *symbol)  {
msousa@417: 	symbol->l_exp->accept(*this);
msousa@417: 	symbol->r_exp->accept(*this);
msousa@417: 	bool found = false;
msousa@417: 
msousa@417: 	for (unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		for (unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: 			if (is_type_equal(symbol->l_exp->candidate_datatypes[i], symbol->r_exp->candidate_datatypes[j])
msousa@417: 					&& is_ANY_ELEMENTARY_compatible(symbol->l_exp->candidate_datatypes[i])) {
msousa@417: 				found = true;
msousa@417: 				break;
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (found)
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(lt_expression_c *symbol) {
msousa@417: 	symbol->l_exp->accept(*this);
msousa@417: 	symbol->r_exp->accept(*this);
msousa@417: 	bool found = false;
msousa@417: 
msousa@417: 	for (unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		for (unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: 			if (is_type_equal(symbol->l_exp->candidate_datatypes[i], symbol->r_exp->candidate_datatypes[j])
msousa@417: 					&& is_ANY_ELEMENTARY_compatible(symbol->l_exp->candidate_datatypes[i])) {
msousa@417: 				found = true;
msousa@417: 				break;
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (found)
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(gt_expression_c *symbol) {
msousa@417: 	symbol->l_exp->accept(*this);
msousa@417: 	symbol->r_exp->accept(*this);
msousa@417: 	bool found = false;
msousa@417: 
msousa@417: 	for (unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		for (unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: 			if (is_type_equal(symbol->l_exp->candidate_datatypes[i], symbol->r_exp->candidate_datatypes[j])
msousa@417: 					&& is_ANY_ELEMENTARY_compatible(symbol->l_exp->candidate_datatypes[i])) {
msousa@417: 				found = true;
msousa@417: 				break;
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (found)
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(le_expression_c *symbol) {
msousa@417: 	symbol->l_exp->accept(*this);
msousa@417: 	symbol->r_exp->accept(*this);
msousa@417: 	bool found = false;
msousa@417: 
msousa@417: 	for (unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		for (unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: 			if (is_type_equal(symbol->l_exp->candidate_datatypes[i], symbol->r_exp->candidate_datatypes[j])
msousa@417: 					&& is_ANY_ELEMENTARY_compatible(symbol->l_exp->candidate_datatypes[i])) {
msousa@417: 				found = true;
msousa@417: 				break;
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (found)
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(ge_expression_c *symbol) {
msousa@417: 	symbol->l_exp->accept(*this);
msousa@417: 	symbol->r_exp->accept(*this);
msousa@417: 	bool found = false;
msousa@417: 
msousa@417: 	for (unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		for (unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: 			if (is_type_equal(symbol->l_exp->candidate_datatypes[i], symbol->r_exp->candidate_datatypes[j])
msousa@417: 					&& is_ANY_ELEMENTARY_compatible(symbol->l_exp->candidate_datatypes[i])) {
msousa@417: 				found = true;
msousa@417: 				break;
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (found)
msousa@417: 		symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(add_expression_c *symbol) {
msousa@417: 	/* The following code is correct when handling the addition of 2 symbolic_variables
msousa@417: 	 * In this case, adding two variables (e.g. USINT_var1 + USINT_var2) will always yield
msousa@417: 	 * the same data type, even if the result of the adition could not fit inside the same
msousa@417: 	 * data type (due to overflowing)
msousa@417: 	 *
msousa@417: 	 * However, when adding two literals (e.g. USINT#42 + USINT#3)
msousa@417: 	 * we should be able to detect overflows of the result, and therefore not consider
msousa@417: 	 * that the result may be of type USINT.
msousa@417: 	 * Currently we do not yet detect these overflows, and allow handling the sum of two USINTs
msousa@417: 	 * as always resulting in an USINT, even in the following expression
msousa@417: 	 * (USINT#65535 + USINT#2).
msousa@417: 	 *
msousa@417: 	 * In the future we can add some code to reduce
msousa@417: 	 * all the expressions that are based on literals into the resulting literal
msousa@417: 	 * value (maybe some visitor class that will run before or after data type
msousa@417: 	 * checking). Since this class will have to be very careful to make sure it implements the same mathematical
msousa@417: 	 * details (e.g. how to round and truncate numbers) as defined in IEC 61131-3, we will leave this to the future.
msousa@417: 	 * Also, the question will arise if we should also replace calls to standard
msousa@417: 	 * functions if the input parameters are all literals (e.g. ADD(42, 42)). This
msousa@417: 	 * means this class will be more difficult than it appears at first.
msousa@417: 	 */
msousa@417: 	symbol_c *left_type, *right_type;
msousa@417: 
msousa@417: 	symbol->l_exp->accept(*this);
msousa@417: 	symbol->r_exp->accept(*this);
msousa@417: 	for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: 			left_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: 			right_type = symbol->r_exp->candidate_datatypes[j];
msousa@417: 			if (is_type_equal(left_type, right_type) && is_ANY_NUM_compatible(left_type))
msousa@417: 				symbol->candidate_datatypes.push_back(left_type);
msousa@417: 			else {
msousa@417: 				symbol_c *result = widening_conversion(left_type, right_type, widen_ADD_table);
msousa@417: 				if (result)
msousa@417: 					symbol->candidate_datatypes.push_back(result);
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (debug) std::cout <<  "+ [" << symbol->l_exp->candidate_datatypes.size() << "," << symbol->r_exp->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(sub_expression_c *symbol) {
msousa@417: 	symbol_c *left_type, *right_type;
msousa@417: 
msousa@417: 	symbol->l_exp->accept(*this);
msousa@417: 	symbol->r_exp->accept(*this);
msousa@417: 	for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: 			left_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: 			right_type = symbol->r_exp->candidate_datatypes[j];
msousa@417: 			if (is_type_equal(left_type, right_type) && is_ANY_NUM_compatible(left_type))
msousa@417: 				symbol->candidate_datatypes.push_back(left_type);
msousa@417: 			else {
msousa@417: 				symbol_c *result = widening_conversion(left_type, right_type, widen_SUB_table);
msousa@417: 				if (result)
msousa@417: 					symbol->candidate_datatypes.push_back(result);
msousa@417: 			}
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (debug) std::cout <<  "- [" << symbol->l_exp->candidate_datatypes.size() << "," << symbol->r_exp->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(mul_expression_c *symbol) {
msousa@417: 	symbol_c *left_type, *right_type;
msousa@417: 
msousa@417: 	symbol->l_exp->accept(*this);
msousa@417: 	symbol->r_exp->accept(*this);
msousa@417: 	for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: 			left_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: 			right_type = symbol->r_exp->candidate_datatypes[j];
msousa@417: 			if      (is_type_equal(left_type, right_type) && is_ANY_NUM_compatible(left_type))
msousa@417: 				symbol->candidate_datatypes.push_back(left_type);
msousa@417: 			else {
msousa@417: 				symbol_c *result = widening_conversion(left_type, right_type, widen_MUL_table);
msousa@417: 				if (result)
msousa@417: 					symbol->candidate_datatypes.push_back(result);
msousa@417: 			}
msousa@417: 
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (debug) std::cout << "* [" << symbol->l_exp->candidate_datatypes.size() << "," << symbol->r_exp->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(div_expression_c *symbol) {
msousa@417: 	symbol_c *left_type, *right_type;
msousa@417: 
msousa@417: 	symbol->l_exp->accept(*this);
msousa@417: 	symbol->r_exp->accept(*this);
msousa@417: 	for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: 			left_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: 			right_type = symbol->r_exp->candidate_datatypes[j];
msousa@417: 			if      (is_type_equal(left_type, right_type) && is_ANY_NUM_type(left_type))
msousa@417: 				symbol->candidate_datatypes.push_back(left_type);
msousa@417: 			else {
msousa@417: 				symbol_c *result = widening_conversion(left_type, right_type, widen_DIV_table);
msousa@417: 				if (result)
msousa@417: 					symbol->candidate_datatypes.push_back(result);
msousa@417: 			}
msousa@417: 
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (debug) std::cout << "/ [" << symbol->l_exp->candidate_datatypes.size() << "," << symbol->r_exp->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(mod_expression_c *symbol) {
msousa@417: 	symbol_c *left_type, *right_type;
msousa@417: 
msousa@417: 	symbol->l_exp->accept(*this);
msousa@417: 	symbol->r_exp->accept(*this);
msousa@417: 	for (unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: 			left_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: 			right_type = symbol->r_exp->candidate_datatypes[j];
msousa@417: 			if (is_type_equal(left_type, right_type) && is_ANY_INT_compatible(left_type))
msousa@417: 				symbol->candidate_datatypes.push_back(left_type);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (debug) std::cout << "mod [" << symbol->l_exp->candidate_datatypes.size() << "," << symbol->r_exp->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(power_expression_c *symbol) {
msousa@417: 	symbol_c *left_type, *right_type;
msousa@417: 	bool check_ok;
msousa@417: 
msousa@417: 	symbol->l_exp->accept(*this);
msousa@417: 	symbol->r_exp->accept(*this);
msousa@417: 	check_ok = false;
msousa@417: 	for (unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		left_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: 		if (is_ANY_REAL_compatible(left_type)) {
msousa@417: 			check_ok = true;
msousa@417: 			break;
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (! check_ok) return NULL;
msousa@417: 	check_ok = false;
msousa@417: 	for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: 		right_type = symbol->r_exp->candidate_datatypes[j];
msousa@417: 		if (is_ANY_NUM_compatible(right_type)) {
msousa@417: 			check_ok = true;
msousa@417: 			break;
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (! check_ok) return NULL;
msousa@417: 	for (unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		symbol->candidate_datatypes.push_back(symbol->l_exp->candidate_datatypes[i]);
msousa@417: 	}
msousa@417: 	if (debug) std::cout << "** [" << symbol->l_exp->candidate_datatypes.size() << "," << symbol->r_exp->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(neg_expression_c *symbol) {
msousa@435:   /* NOTE: The standard defines the syntax for this 'negation' operation, but
msousa@435:    *       does not define the its semantics.
msousa@435:    *
msousa@435:    *       We could be tempted to consider that the semantics of the
msousa@435:    *       'negation' operation are similar/identical to the semantics of the 
msousa@435:    *       SUB expression/operation. This would include assuming that the
msousa@435:    *       possible datatypes for the 'negation' operation is also
msousa@435:    *       the same as those for the SUB expression/operation, namely ANY_MAGNITUDE.
msousa@435:    *
msousa@435:    *       However, this would then mean that the following ST code would be 
msousa@435:    *       syntactically and semantically correct:
msousa@435:    *       uint_var := - (uint_var);
msousa@435:    *
msousa@435:    *       According to the standard, the above code should result in a 
msousa@435:    *       runtime error, when we try to apply a negative value to the
msousa@435:    *       UINT typed variable 'uint_var'.
msousa@435:    *
msousa@435:    *       It is much easier for the compiler to detect this at compile time,
msousa@435:    *       and it is probably safer to the resulting code too.
msousa@435:    *
msousa@435:    *       To detect these tyes of errors at compile time, the easisest solution
msousa@435:    *       is to only allow ANY_NUM datatytpes that are signed.
msousa@435:    *        So, that is what we do here!
msousa@435:    */
msousa@417: 	symbol->exp->accept(*this);
msousa@417: 	for (unsigned int i = 0; i < symbol->exp->candidate_datatypes.size(); i++) {
msousa@435: 		if (is_ANY_signed_MAGNITUDE_compatible(symbol->exp->candidate_datatypes[i]))
msousa@417: 			symbol->candidate_datatypes.push_back(symbol->exp->candidate_datatypes[i]);
msousa@417: 	}
msousa@417: 	if (debug) std::cout << "neg [" << symbol->exp->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(not_expression_c *symbol) {
msousa@417: 	symbol->exp->accept(*this);
msousa@417: 	for (unsigned int i = 0; i < symbol->exp->candidate_datatypes.size(); i++) {
msousa@417: 		if      (is_ANY_BIT_compatible(symbol->exp->candidate_datatypes[i]))
msousa@417: 			symbol->candidate_datatypes.push_back(symbol->exp->candidate_datatypes[i]);
msousa@417: 	}
msousa@417: 	if (debug) std::cout << "not [" << symbol->exp->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(function_invocation_c *symbol) {
msousa@438: 	if      (NULL != symbol->formal_param_list)        symbol->   formal_param_list->accept(*this);
msousa@438: 	else if (NULL != symbol->nonformal_param_list)     symbol->nonformal_param_list->accept(*this);
msousa@417: 	else ERROR;
msousa@438: 
msousa@438: 	generic_function_call_t fcall_param = {
msousa@441: 		/* fcall_param.function_name               = */ symbol->function_name,
msousa@441: 		/* fcall_param.nonformal_operand_list      = */ symbol->nonformal_param_list,
msousa@441: 		/* fcall_param.formal_operand_list         = */ symbol->formal_param_list,
msousa@441: 		/* enum {POU_FB, POU_function} POU_type    = */ generic_function_call_t::POU_function,
msousa@441: 		/* fcall_param.candidate_functions         = */ symbol->candidate_functions,
msousa@441: 		/* fcall_param.called_function_declaration = */ symbol->called_function_declaration,
msousa@441: 		/* fcall_param.extensible_param_count      = */ symbol->extensible_param_count
msousa@438: 	};
msousa@438: 	handle_function_call(symbol, fcall_param);
msousa@438: 
msousa@438: 	if (debug) std::cout << "function_invocation_c [" << symbol->candidate_datatypes.size() << "] result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@421: 
msousa@421: 
msousa@417: /********************/
msousa@417: /* B 3.2 Statements */
msousa@417: /********************/
msousa@417: // SYM_LIST(statement_list_c)
msousa@417: /* The visitor of the base class search_visitor_c will handle calling each instruction in the list.
msousa@417:  * We do not need to do anything here...
msousa@417:  */
msousa@417: // void *fill_candidate_datatypes_c::visit(statement_list_c *symbol)
msousa@417: 
msousa@417: 
msousa@417: /*********************************/
msousa@417: /* B 3.2.1 Assignment Statements */
msousa@417: /*********************************/
msousa@417: void *fill_candidate_datatypes_c::visit(assignment_statement_c *symbol) {
msousa@417: 	symbol_c *left_type, *right_type;
msousa@417: 
msousa@417: 	symbol->l_exp->accept(*this);
msousa@417: 	symbol->r_exp->accept(*this);
msousa@417: 	for (unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: 		for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: 			left_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: 			right_type = symbol->r_exp->candidate_datatypes[j];
msousa@417: 			if (is_type_equal(left_type, right_type))
msousa@417: 				symbol->candidate_datatypes.push_back(left_type);
msousa@417: 		}
msousa@417: 	}
msousa@417: 	if (debug) std::cout << ":= [" << symbol->l_exp->candidate_datatypes.size() << "," << symbol->r_exp->candidate_datatypes.size() << "] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
conti@418: /*****************************************/
conti@418: /* B 3.2.2 Subprogram Control Statements */
conti@418: /*****************************************/
conti@418: void *fill_candidate_datatypes_c::visit(fb_invocation_c *symbol) {
msousa@420: 	bool compatible = false;
conti@418: 	symbol_c *fb_decl = search_varfb_instance_type->get_basetype_decl(symbol->fb_name);
msousa@424: 	/* Although a call to a non-declared FB is a semantic error, this is currently caught by stage 2! */
conti@418: 	if (NULL == fb_decl) ERROR;
msousa@424: 
msousa@420: 	if (symbol->   formal_param_list != NULL) {
msousa@420: 		symbol->formal_param_list->accept(*this);
msousa@420: 		compatible = match_formal_call(symbol, fb_decl);
msousa@420: 	}
msousa@420: 	if (symbol->nonformal_param_list != NULL) {
msousa@420: 		symbol->nonformal_param_list->accept(*this);
msousa@420: 		compatible = match_nonformal_call(symbol, fb_decl);
msousa@420: 	}
msousa@424: 
msousa@431: 	/* The print_datatypes_error_c does not rely on this called_fb_declaration pointer being != NULL to conclude that
msousa@431: 	 * we have a datat type incompatibility error, so setting it to the correct fb_decl is actually safe,
msousa@431: 	 * as the compiler will never reach the compilation stage!
msousa@431: 	 */
msousa@431: 	symbol->called_fb_declaration = fb_decl;
msousa@424: 
conti@418: 	if (debug) std::cout << "FB [] ==> "  << symbol->candidate_datatypes.size() << " result.\n";
conti@418: 	return NULL;
conti@418: }
conti@418: 
msousa@417: 
msousa@417: 
msousa@417: /********************************/
msousa@417: /* B 3.2.3 Selection Statements */
msousa@417: /********************************/
msousa@417: void *fill_candidate_datatypes_c::visit(if_statement_c *symbol) {
msousa@417: 	symbol->expression->accept(*this);
msousa@417: 	if (NULL != symbol->statement_list)
msousa@417: 		symbol->statement_list->accept(*this);
msousa@417: 	if (NULL != symbol->elseif_statement_list)
msousa@417: 		symbol->elseif_statement_list->accept(*this);
msousa@417: 	if (NULL != symbol->else_statement_list)
msousa@417: 		symbol->else_statement_list->accept(*this);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(elseif_statement_c *symbol) {
msousa@417: 	symbol->expression->accept(*this);
msousa@417: 	if (NULL != symbol->statement_list)
msousa@417: 		symbol->statement_list->accept(*this);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: /* CASE expression OF case_element_list ELSE statement_list END_CASE */
msousa@417: // SYM_REF3(case_statement_c, expression, case_element_list, statement_list)
msousa@417: void *fill_candidate_datatypes_c::visit(case_statement_c *symbol) {
msousa@417: 	symbol->expression->accept(*this);
msousa@417: 	if (NULL != symbol->case_element_list)
msousa@417: 		symbol->case_element_list->accept(*this);
msousa@417: 	if (NULL != symbol->statement_list)
msousa@417: 		symbol->statement_list->accept(*this);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: /* helper symbol for case_statement */
msousa@417: // SYM_LIST(case_element_list_c)
msousa@417: /* NOTE: visitor method for case_element_list_c is not required since we inherit from iterator_visitor_c */
msousa@417: 
msousa@417: /*  case_list ':' statement_list */
msousa@417: // SYM_REF2(case_element_c, case_list, statement_list)
msousa@417: /* NOTE: visitor method for case_element_c is not required since we inherit from iterator_visitor_c */
msousa@417: 
msousa@417: // SYM_LIST(case_list_c)
msousa@417: /* NOTE: visitor method for case_list_c is not required since we inherit from iterator_visitor_c */
msousa@417: 
msousa@417: /********************************/
msousa@417: /* B 3.2.4 Iteration Statements */
msousa@417: /********************************/
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(for_statement_c *symbol) {
msousa@417: 	symbol->control_variable->accept(*this);
msousa@417: 	symbol->beg_expression->accept(*this);
msousa@417: 	symbol->end_expression->accept(*this);
msousa@417: 	if (NULL != symbol->by_expression)
msousa@417: 		symbol->by_expression->accept(*this);
msousa@417: 	if (NULL != symbol->statement_list)
msousa@417: 		symbol->statement_list->accept(*this);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(while_statement_c *symbol) {
msousa@417: 	symbol->expression->accept(*this);
msousa@417: 	if (NULL != symbol->statement_list)
msousa@417: 		symbol->statement_list->accept(*this);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: void *fill_candidate_datatypes_c::visit(repeat_statement_c *symbol) {
msousa@417: 	symbol->expression->accept(*this);
msousa@417: 	if (NULL != symbol->statement_list)
msousa@417: 		symbol->statement_list->accept(*this);
msousa@417: 	return NULL;
msousa@417: }
msousa@417: 
msousa@417: 
msousa@417: 
msousa@417: 
msousa@417: 
msousa@417: