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 .
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
msousa@417: #include
msousa@417: #include
msousa@417: #include
msousa@417: #include
msousa@417:
msousa@417: /* set to 1 to see debug info during execution */
msousa@454: 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@478: 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@478: if ((typeid(*left_type) == typeid(*widen_table[k].left)) && (typeid(*right_type) == typeid(*widen_table[k].right)))
conti@476: return widen_table[k].result;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@421:
msousa@465: /* add a data type to a candidate data type list, while guaranteeing no duplicate entries! */
msousa@465: /* Returns true if it really did add the datatype to the list, or false if it was already present in the list! */
msousa@465: bool fill_candidate_datatypes_c::add_datatype_to_candidate_list(symbol_c *symbol, symbol_c *datatype) {
msousa@478: /* If it is an invalid data type, do not insert!
msousa@478: * NOTE: it reduces overall code size to do this test here, instead of doing every time before calling the add_datatype_to_candidate_list() function.
msousa@478: */
msousa@478: if (!is_type_valid(datatype)) /* checks for NULL and invalid_type_name_c */
msousa@478: return false;
msousa@478:
msousa@465: if (search_in_candidate_datatype_list(datatype, symbol->candidate_datatypes) >= 0)
msousa@465: /* already in the list, Just return! */
msousa@465: return false;
msousa@465:
msousa@465: /* not yet in the candidate data type list, so we insert it now! */
msousa@465: symbol->candidate_datatypes.push_back(datatype);
msousa@465: return true;
msousa@465: }
msousa@465:
msousa@465:
msousa@472: bool fill_candidate_datatypes_c::add_2datatypes_to_candidate_list(symbol_c *symbol, symbol_c *datatype1, symbol_c *datatype2) {
msousa@472: add_datatype_to_candidate_list(symbol, datatype1);
msousa@472: add_datatype_to_candidate_list(symbol, datatype2);
msousa@472: return true;
msousa@472: }
msousa@465:
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@455: /* TODO: verify if it is lvalue when INOUT or OUTPUT parameters! */
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@455: bool fill_candidate_datatypes_c::match_formal_call(symbol_c *f_call, symbol_c *f_decl, symbol_c **first_param_datatype) {
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@455: bool is_first_param = true;
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 &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@455:
msousa@455: /* If this is the first parameter, then copy the datatype to *first_param_datatype */
msousa@455: if (is_first_param)
msousa@455: if (NULL != first_param_datatype)
msousa@455: *first_param_datatype = param_datatype;
msousa@455: is_first_param = false;
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 &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 *candidate_datatypes,
msousa@438: std::vector *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@465: if (add_datatype_to_candidate_list(fcall, returned_parameter_type))
msousa@465: /* we only add it to the function declaration list if this entry was not already present in the candidate datatype list! */
msousa@465: fcall_data.candidate_functions.push_back(f_decl);
msousa@465:
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@465: returned_parameter_type = base_type(f_decl->type_name);
msousa@465: if (add_datatype_to_candidate_list(fcall, returned_parameter_type))
msousa@465: /* we only add it to the function declaration list if this entry was not already present in the candidate datatype list! */
msousa@438: fcall_data.candidate_functions.push_back(f_decl);
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: void fill_candidate_datatypes_c::handle_implicit_il_fb_call(symbol_c *il_instruction, const char *param_name, symbol_c *&called_fb_declaration) {
msousa@447: symbol_c *fb_type_id = search_varfb_instance_type->get_basetype_id(il_operand);
msousa@455: /* Although a call to a non-declared FB is a semantic error, this is currently caught by stage 2! */
msousa@455: if (NULL == fb_type_id) ERROR;
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@455: * this is a semantic error.
msousa@447: */
msousa@455: fb_decl = NULL;
msousa@455:
msousa@455: /* The narrow_candidate_datatypes_c does not rely on this called_fb_declaration pointer being == NULL to conclude that
msousa@455: * we have a datatype incompatibility error, so we set it to fb_decl to allow the print_datatype_error_c to print out
msousa@455: * more informative error messages!
msousa@450: */
msousa@455: called_fb_declaration = fb_decl;
msousa@455:
msousa@455: /* This implicit FB call does not change the value stored in the current/default IL variable */
msousa@456: /* It does, however, require that the datatype be compatible with the input parameter of the FB being called.
msousa@456: * If we were to follow the filling & narrowing algorithm correctly (implemented in fill_candidate_datatypes_c
msousa@456: * & narrow_candidate_datatypes_c respectively), we should be restricting the candidate_datatpes to the datatypes
msousa@456: * that are compatible to the FB call.
msousa@456: * However, doing the above will often result in some very confusing error messages for the user, especially in the case
msousa@456: * in which the FB call is wrong, so the resulting cadidate datatypes is an empty list. In this case, the user would see
msousa@456: * many error messages related to the IL instructions that follow the FB call, even though those IL instructions may be perfectly
msousa@456: * correct.
msousa@456: * For now, we will simply let the narrow_candidate_datatypes_c verify if the datatypes are compatible (something that should be done
msousa@456: * here).
msousa@456: */
msousa@455: if (NULL != prev_il_instruction)
msousa@467: il_instruction->candidate_datatypes = prev_il_instruction->candidate_datatypes;
msousa@455:
msousa@455: if (debug) std::cout << "handle_implicit_il_fb_call() [" << prev_il_instruction->candidate_datatypes.size() << "] ==> " << il_instruction->candidate_datatypes.size() << " result.\n";
msousa@447: }
msousa@438:
msousa@438:
msousa@479:
msousa@479:
msousa@479: /* handle a binary IL operator, like ADD, SUB, etc... */
msousa@479: void *fill_candidate_datatypes_c::handle_binary_operator(const struct widen_entry widen_table[], symbol_c *symbol, symbol_c *l_expr, symbol_c *r_expr) {
msousa@479: if (NULL == l_expr) /* if no prev_il_instruction */
msousa@479: return NULL;
msousa@479:
msousa@479: for(unsigned int i = 0; i < l_expr->candidate_datatypes.size(); i++)
msousa@479: for(unsigned int j = 0; j < r_expr->candidate_datatypes.size(); j++)
msousa@479: /* NOTE: add_datatype_to_candidate_list() will only really add the datatype if it is != NULL !!! */
msousa@479: add_datatype_to_candidate_list(symbol, widening_conversion(l_expr->candidate_datatypes[i], r_expr->candidate_datatypes[j], widen_table));
msousa@479:
msousa@479: if (debug) std::cout << "[" << l_expr->candidate_datatypes.size() << "," << r_expr->candidate_datatypes.size() << "] ==> " << symbol->candidate_datatypes.size() << " result.\n";
msousa@479: return NULL;
msousa@479: }
msousa@479:
msousa@479:
msousa@479: /* handle a binary ST expression, like '+', '-', etc... */
msousa@479: void *fill_candidate_datatypes_c::handle_binary_expression(const struct widen_entry widen_table[], symbol_c *symbol, symbol_c *l_expr, symbol_c *r_expr) {
msousa@479: l_expr->accept(*this);
msousa@479: r_expr->accept(*this);
msousa@479: return handle_binary_operator(widen_table, symbol, l_expr, r_expr);
msousa@479: }
msousa@479:
msousa@479:
msousa@479:
msousa@479:
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@472: #define sizeoftype(symbol) get_sizeof_datatype_c::getsize(symbol)
msousa@472:
msousa@472: void *fill_candidate_datatypes_c::handle_any_integer(symbol_c *symbol) {
msousa@472: int calc_size;
msousa@472:
msousa@472: calc_size = sizeoftype(symbol);
msousa@472: if (calc_size <= sizeoftype(&search_constant_type_c::bool_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::bool_type_name, &search_constant_type_c::safebool_type_name);
msousa@472: if (calc_size <= sizeoftype(&search_constant_type_c::byte_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::byte_type_name, &search_constant_type_c::safebyte_type_name);
msousa@472: if (calc_size <= sizeoftype(&search_constant_type_c::word_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::word_type_name, &search_constant_type_c::safeword_type_name);
msousa@472: if (calc_size <= sizeoftype(&search_constant_type_c::dword_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::dword_type_name, &search_constant_type_c::safedword_type_name);
msousa@472: if (calc_size <= sizeoftype(&search_constant_type_c::lword_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::lword_type_name, &search_constant_type_c::safelword_type_name);
msousa@472:
msousa@472: if (calc_size < sizeoftype(&search_constant_type_c::sint_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::sint_type_name, &search_constant_type_c::safesint_type_name);
msousa@472: if (calc_size < sizeoftype(&search_constant_type_c::int_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::int_type_name, &search_constant_type_c::safeint_type_name);
msousa@472: if (calc_size < sizeoftype(&search_constant_type_c::dint_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::dint_type_name, &search_constant_type_c::safedint_type_name);
msousa@472: if (calc_size < sizeoftype(&search_constant_type_c::lint_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::lint_type_name, &search_constant_type_c::safelint_type_name);
msousa@472: if (calc_size <= sizeoftype(&search_constant_type_c::usint_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::usint_type_name, &search_constant_type_c::safeusint_type_name);
msousa@472: if (calc_size <= sizeoftype(&search_constant_type_c::uint_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::uint_type_name, &search_constant_type_c::safeuint_type_name);
msousa@472: if (calc_size <= sizeoftype(&search_constant_type_c::udint_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::udint_type_name, &search_constant_type_c::safeudint_type_name);
msousa@472: if (calc_size <= sizeoftype(&search_constant_type_c::ulint_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::ulint_type_name, &search_constant_type_c::safeulint_type_name);
msousa@479:
msousa@479: if (debug) std::cout << "ANY_INT [" << symbol->candidate_datatypes.size()<< "]" << std::endl;
msousa@472: return NULL;
msousa@472: }
msousa@472:
msousa@472:
msousa@472:
msousa@472:
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@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::real_type_name, &search_constant_type_c::safereal_type_name);
msousa@429: if (calc_size <= sizeoftype(&search_constant_type_c::lreal_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::lreal_type_name, &search_constant_type_c::safelreal_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@472:
msousa@472: void *fill_candidate_datatypes_c::visit(neg_real_c *symbol) {
msousa@417: int calc_size;
msousa@417:
msousa@417: calc_size = sizeoftype(symbol);
msousa@472: if (calc_size <= sizeoftype(&search_constant_type_c::real_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::real_type_name, &search_constant_type_c::safereal_type_name);
msousa@472: if (calc_size <= sizeoftype(&search_constant_type_c::lreal_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::lreal_type_name, &search_constant_type_c::safelreal_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@472:
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@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::int_type_name, &search_constant_type_c::safeint_type_name);
msousa@417: if (calc_size <= sizeoftype(&search_constant_type_c::sint_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::sint_type_name, &search_constant_type_c::safesint_type_name);
msousa@417: if (calc_size <= sizeoftype(&search_constant_type_c::dint_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::dint_type_name, &search_constant_type_c::safedint_type_name);
msousa@417: if (calc_size <= sizeoftype(&search_constant_type_c::lint_type_name))
msousa@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::lint_type_name, &search_constant_type_c::safelint_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@472:
msousa@479: void *fill_candidate_datatypes_c::visit(integer_c *symbol) {return handle_any_integer(symbol);}
msousa@479: void *fill_candidate_datatypes_c::visit(binary_integer_c *symbol) {return handle_any_integer(symbol);}
msousa@479: void *fill_candidate_datatypes_c::visit(octal_integer_c *symbol) {return handle_any_integer(symbol);}
msousa@479: void *fill_candidate_datatypes_c::visit(hex_integer_c *symbol) {return handle_any_integer(symbol);}
msousa@417:
msousa@472:
msousa@427: // SYM_REF2(integer_literal_c, type, value)
msousa@472: /*
msousa@472: * integer_literal:
msousa@472: * integer_type_name '#' signed_integer
msousa@472: * | integer_type_name '#' binary_integer
msousa@472: * | integer_type_name '#' octal_integer
msousa@472: * | integer_type_name '#' hex_integer
msousa@472: */
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@465: add_datatype_to_candidate_list(symbol, 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@465: add_datatype_to_candidate_list(symbol, 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@465: add_datatype_to_candidate_list(symbol, 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@465: add_datatype_to_candidate_list(symbol, 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@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::bool_type_name, &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@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::bool_type_name, &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@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::bool_type_name, &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@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::wstring_type_name, &search_constant_type_c::safewstring_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@472: add_2datatypes_to_candidate_list(symbol, &search_constant_type_c::string_type_name, &search_constant_type_c::safestring_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@459:
msousa@472: add_datatype_to_candidate_list(symbol, 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@479: void *fill_candidate_datatypes_c::visit(time_of_day_c *symbol) {add_datatype_to_candidate_list(symbol, symbol->type_name); return NULL;}
msousa@479: void *fill_candidate_datatypes_c::visit(date_c *symbol) {add_datatype_to_candidate_list(symbol, symbol->type_name); return NULL;}
msousa@479: void *fill_candidate_datatypes_c::visit(date_and_time_c *symbol) {add_datatype_to_candidate_list(symbol, symbol->type_name); return NULL;}
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@465: add_datatype_to_candidate_list(symbol, 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@465: add_datatype_to_candidate_list(symbol, 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@479: add_datatype_to_candidate_list(symbol, search_varfb_instance_type->get_basetype_decl(symbol)); /* will only add if non NULL */
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@479: case 'X': /* bit - 1 bit */ add_datatype_to_candidate_list(symbol, &search_constant_type_c::bool_type_name); break;
msousa@479: case 'B': /* byte - 8 bits */ add_datatype_to_candidate_list(symbol, &search_constant_type_c::byte_type_name); break;
msousa@479: case 'W': /* word - 16 bits */ add_datatype_to_candidate_list(symbol, &search_constant_type_c::word_type_name); break;
msousa@479: case 'D': /* dword - 32 bits */ add_datatype_to_candidate_list(symbol, &search_constant_type_c::dword_type_name); break;
msousa@479: case 'L': /* lword - 64 bits */ add_datatype_to_candidate_list(symbol, &search_constant_type_c::lword_type_name); break;
msousa@479: /* if none of the above, then the empty string was used <=> boolean */
msousa@479: default: add_datatype_to_candidate_list(symbol, &search_constant_type_c::bool_type_name); 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@465: if (NULL != result) add_datatype_to_candidate_list(symbol, 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@455: // void *fill_candidate_datatypes_c::visit(subscript_list_c *symbol)
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@479: add_datatype_to_candidate_list(symbol, search_varfb_instance_type->get_basetype_decl(symbol)); /* will only add if non NULL */
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@479: if (debug) printf("Filling candidate data types list of function %s\n", ((token_c *)(symbol->derived_function_name))->value);
msousa@417: search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
msousa@417: symbol->var_declarations_list->accept(*this);
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@479: if (debug) printf("Filling candidate data types list of FB %s\n", ((token_c *)(symbol->fblock_name))->value);
msousa@417: search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
msousa@417: symbol->var_declarations->accept(*this);
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@479: if (debug) printf("Filling candidate data types list in program %s\n", ((token_c *)(symbol->program_type_name))->value);
msousa@417: search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
msousa@417: symbol->var_declarations->accept(*this);
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: // TODO !!!
msousa@417: /* for the moment we must return NULL so semantic analysis of remaining code is not interrupted! */
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@464: void *fill_candidate_datatypes_c::visit(instruction_list_c *symbol) {
msousa@465: /* In order to fill the data type candidates correctly
msousa@465: * in IL instruction lists containing JMPs to labels that come before the JMP instruction
msousa@464: * itself, we need to run the fill candidate datatypes algorithm twice on the Instruction List.
msousa@464: * e.g.: ...
msousa@464: * ld 23
msousa@464: * label1:st byte_var
msousa@464: * ld 34
msousa@464: * JMP label1
msousa@464: *
msousa@464: * Note that the second time we run the algorithm, most of the candidate datatypes are already filled
msousa@464: * in, so it will be able to produce tha correct candidate datatypes for the IL instruction referenced
msousa@464: * by the label, as in the 2nd pass we already know the candidate datatypes of the JMP instruction!
msousa@464: */
msousa@464: for(int j = 0; j < 2; j++) {
msousa@464: for(int i = 0; i < symbol->n; i++) {
msousa@464: symbol->elements[i]->accept(*this);
msousa@464: }
msousa@464: }
msousa@464: return NULL;
msousa@464: }
msousa@443:
msousa@443:
msousa@459:
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@459: intersect_prev_candidate_datatype_lists(symbol);
msousa@448: } else {
msousa@459: il_instruction_c fake_prev_il_instruction = *symbol;
msousa@459: intersect_prev_candidate_datatype_lists(&fake_prev_il_instruction);
msousa@459:
msousa@457: if (symbol->prev_il_instruction.size() == 0) prev_il_instruction = NULL;
msousa@459: else prev_il_instruction = &fake_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@467: symbol->candidate_datatypes = symbol->il_instruction->candidate_datatypes;
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@467: symbol->candidate_datatypes = symbol->il_simple_operator->candidate_datatypes;
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@451: * to the il_operand_list, and remove it after calling handle_function_call().
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: */
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@451: if (NULL != prev_il_instruction) {
msousa@451: ((list_c *)symbol->il_operand_list)->insert_element(prev_il_instruction, 0);
msousa@451:
msousa@451: generic_function_call_t fcall_param = {
msousa@451: /* fcall_param.function_name = */ symbol->function_name,
msousa@451: /* fcall_param.nonformal_operand_list = */ symbol->il_operand_list,
msousa@451: /* fcall_param.formal_operand_list = */ NULL,
msousa@451: /* enum {POU_FB, POU_function} POU_type = */ generic_function_call_t::POU_function,
msousa@451: /* fcall_param.candidate_functions = */ symbol->candidate_functions,
msousa@451: /* fcall_param.called_function_declaration = */ symbol->called_function_declaration,
msousa@451: /* fcall_param.extensible_param_count = */ symbol->extensible_param_count
msousa@451: };
msousa@451: handle_function_call(symbol, fcall_param);
msousa@451:
msousa@451: /* Undo the changes to the abstract syntax tree we made above... */
msousa@451: ((list_c *)symbol->il_operand_list)->remove_element(0);
msousa@451: }
msousa@451:
msousa@451: /* Undo the changes to the abstract syntax tree we made above... */
msousa@451: if (((list_c *)symbol->il_operand_list)->n == 0) {
msousa@451: /* if the list becomes empty, then that means that it did not exist before we made these changes, so we delete it! */
msousa@451: delete symbol->il_operand_list;
msousa@451: symbol->il_operand_list = NULL;
msousa@451: }
msousa@451:
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@453: symbol_c *prev_il_instruction_backup = prev_il_instruction;
msousa@453:
msousa@417: if (NULL != symbol->il_operand)
msousa@417: symbol->il_operand->accept(*this);
msousa@453:
msousa@453: if(symbol->simple_instr_list != NULL)
msousa@417: symbol->simple_instr_list->accept(*this);
msousa@417:
msousa@417: /* Now check the if the data type semantics of operation are correct, */
msousa@452: il_operand = symbol->simple_instr_list;
msousa@417: prev_il_instruction = prev_il_instruction_backup;
msousa@417: symbol->il_expr_operator->accept(*this);
msousa@417: il_operand = NULL;
msousa@454:
msousa@454: /* This object has the same candidate datatypes as the il_expr_operator. */
msousa@467: symbol->candidate_datatypes = symbol->il_expr_operator->candidate_datatypes;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@462:
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@462: /* This object has the same candidate datatypes as the il_jump_operator. */
msousa@467: symbol->candidate_datatypes = symbol->il_jump_operator->candidate_datatypes;
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@455: /* We do not call
msousa@455: * fb_decl = search_varfb_instance_type->get_basetype_decl(symbol->fb_name);
msousa@455: * because we want to make sure it is a FB instance, and not some other data type...
msousa@455: */
msousa@455: symbol_c *fb_type_id = search_varfb_instance_type->get_basetype_id(symbol->fb_name);
msousa@455: /* Although a call to a non-declared FB is a semantic error, this is currently caught by stage 2! */
msousa@455: if (NULL == fb_type_id) ERROR;
msousa@455:
msousa@455: function_block_declaration_c *fb_decl = function_block_type_symtable.find_value(fb_type_id);
msousa@455: if (function_block_type_symtable.end_value() == fb_decl)
msousa@455: /* The fb_name not the name of a FB instance. Most probably it is the name of a variable of some other type. */
msousa@455: fb_decl = NULL;
msousa@455:
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@455: if (symbol-> il_param_list != NULL) symbol->il_param_list->accept(*this);
msousa@455: if (symbol->il_operand_list != NULL) symbol->il_operand_list->accept(*this);
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@455: /* Let the il_call_operator (CAL, CALC, or CALCN) determine the candidate datatypes of the il_fb_call_c... */
msousa@455: /* NOTE: We ignore whether the call is 'compatible' or not when filling in the candidate datatypes list.
msousa@455: * Even if it is not compatible, we fill in the candidate datatypes list correctly so that the following
msousa@455: * IL instructions may be handled correctly and debuged.
msousa@455: * Doing this is actually safe, as the parameter_list will still contain errors that will be found by
msousa@455: * print_datatypes_error_c, so the code will never reach stage 4!
msousa@455: */
msousa@455: symbol->il_call_operator->accept(*this);
msousa@467: symbol->candidate_datatypes = symbol->il_call_operator->candidate_datatypes;
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@452:
msousa@452: // void *visit(il_operand_list_c *symbol);
msousa@452:
msousa@452:
msousa@452: /* | simple_instr_list il_simple_instruction */
msousa@452: /* This object is referenced by il_expression_c objects */
msousa@452: void *fill_candidate_datatypes_c::visit(simple_instr_list_c *symbol) {
msousa@453: if (symbol->n <= 0)
msousa@453: return NULL; /* List is empty! Nothing to do. */
msousa@453:
msousa@453: for(int i = 0; i < symbol->n; i++)
msousa@452: symbol->elements[i]->accept(*this);
msousa@453:
msousa@453: /* This object has (inherits) the same candidate datatypes as the last il_instruction */
msousa@467: symbol->candidate_datatypes = symbol->elements[symbol->n-1]->candidate_datatypes;
msousa@452:
msousa@452: if (debug) std::cout << "simple_instr_list_c [" << symbol->candidate_datatypes.size() << "] result.\n";
msousa@452: return NULL;
msousa@452: }
msousa@452:
msousa@457:
msousa@457:
msousa@457:
msousa@453: // SYM_REF1(il_simple_instruction_c, il_simple_instruction, symbol_c *prev_il_instruction;)
msousa@453: void *fill_candidate_datatypes_c::visit(il_simple_instruction_c *symbol) {
msousa@459: if (symbol->prev_il_instruction.size() > 1) ERROR; /* There should be no labeled insructions inside an IL expression! */
msousa@457: if (symbol->prev_il_instruction.size() == 0) prev_il_instruction = NULL;
msousa@457: else prev_il_instruction = symbol->prev_il_instruction[0];
msousa@453: symbol->il_simple_instruction->accept(*this);
msousa@453: prev_il_instruction = NULL;
msousa@453:
msousa@453: /* This object has (inherits) the same candidate datatypes as the il_simple_instruction it points to */
msousa@467: symbol->candidate_datatypes = symbol->il_simple_instruction->candidate_datatypes;
msousa@453: return NULL;
msousa@453: }
msousa@453:
msousa@453:
msousa@417: /*
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@465: add_datatype_to_candidate_list(symbol, 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@465: add_datatype_to_candidate_list(symbol, 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@465: add_datatype_to_candidate_list(symbol, 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@465: add_datatype_to_candidate_list(symbol, 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@470: /* NOTE: the standard allows syntax in which the NOT operator is followed by an optional
msousa@470: * NOT []
msousa@470: * However, it does not define the semantic of the NOT operation when the is specified.
msousa@470: * We therefore consider it an error if an il_operand is specified!
msousa@470: */
msousa@470: if (NULL == prev_il_instruction) return NULL;
msousa@470: for (unsigned int i = 0; i < prev_il_instruction->candidate_datatypes.size(); i++) {
msousa@470: if (is_ANY_BIT_compatible(prev_il_instruction->candidate_datatypes[i]))
msousa@470: add_datatype_to_candidate_list(symbol, prev_il_instruction->candidate_datatypes[i]);
msousa@470: }
msousa@470: if (debug) std::cout << "NOT_operator [" << prev_il_instruction->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(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];
msousa@473: /* TODO: I believe the following is wrong! The data types of prev_instruction_type and operand_type DO NOT have to be equal.
msousa@473: * the prev_instruction_type MUST be BOOL compatible.
msousa@473: * I am not too sure about operand_type, does it have to be BOOL compatible, or can it be ANY_BIT compatible? Must check!
msousa@473: */
conti@440: if (is_type_equal(prev_instruction_type,operand_type) && is_ANY_BOOL_compatible(operand_type))
msousa@465: add_datatype_to_candidate_list(symbol, 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];
msousa@473: /* TODO: I believe the following is wrong! The data types of prev_instruction_type and operand_type DO NOT have to be equal.
msousa@473: * the prev_instruction_type MUST be BOOL compatible.
msousa@473: * I am not too sure about operand_type, does it have to be BOOL compatible, or can it be ANY_BIT compatible? Must check!
msousa@473: */
conti@440: if (is_type_equal(prev_instruction_type,operand_type) && is_ANY_BOOL_compatible(operand_type))
msousa@465: add_datatype_to_candidate_list(symbol, 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@479: void *fill_candidate_datatypes_c::visit(S1_operator_c *symbol) {handle_implicit_il_fb_call(symbol, "S1", symbol->called_fb_declaration); return NULL;}
msousa@479: void *fill_candidate_datatypes_c::visit(R1_operator_c *symbol) {handle_implicit_il_fb_call(symbol, "R1", symbol->called_fb_declaration); return NULL;}
msousa@479: void *fill_candidate_datatypes_c::visit(CLK_operator_c *symbol) {handle_implicit_il_fb_call(symbol, "CLK", symbol->called_fb_declaration); return NULL;}
msousa@479: void *fill_candidate_datatypes_c::visit(CU_operator_c *symbol) {handle_implicit_il_fb_call(symbol, "CU", symbol->called_fb_declaration); return NULL;}
msousa@479: void *fill_candidate_datatypes_c::visit(CD_operator_c *symbol) {handle_implicit_il_fb_call(symbol, "CD", symbol->called_fb_declaration); return NULL;}
msousa@479: void *fill_candidate_datatypes_c::visit(PV_operator_c *symbol) {handle_implicit_il_fb_call(symbol, "PV", symbol->called_fb_declaration); return NULL;}
msousa@479: void *fill_candidate_datatypes_c::visit(IN_operator_c *symbol) {handle_implicit_il_fb_call(symbol, "IN", symbol->called_fb_declaration); return NULL;}
msousa@479: void *fill_candidate_datatypes_c::visit(PT_operator_c *symbol) {handle_implicit_il_fb_call(symbol, "PT", symbol->called_fb_declaration); return NULL;}
msousa@447:
msousa@481: void *fill_candidate_datatypes_c::visit(AND_operator_c *symbol) {return handle_binary_operator(widen_AND_table, symbol, prev_il_instruction, il_operand);}
msousa@481: void *fill_candidate_datatypes_c::visit(OR_operator_c *symbol) {return handle_binary_operator(widen_OR_table, symbol, prev_il_instruction, il_operand);}
msousa@481: void *fill_candidate_datatypes_c::visit(XOR_operator_c *symbol) {return handle_binary_operator(widen_XOR_table, symbol, prev_il_instruction, il_operand);}
msousa@481:
msousa@481:
msousa@481: 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@465: add_datatype_to_candidate_list(symbol, prev_instruction_type);
msousa@417: }
msousa@417: }
msousa@481: if (debug) std::cout << "ANDN [" << prev_il_instruction->candidate_datatypes.size() << "," << il_operand->candidate_datatypes.size() << "] ==> " << symbol->candidate_datatypes.size() << " result.\n";
msousa@481: return NULL;
msousa@481: }
msousa@481:
msousa@481: 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@465: add_datatype_to_candidate_list(symbol, prev_instruction_type);
msousa@417: }
msousa@417: }
msousa@481: if (debug) std::cout << "ORN [" << prev_il_instruction->candidate_datatypes.size() << "," << il_operand->candidate_datatypes.size() << "] ==> " << symbol->candidate_datatypes.size() << " result.\n";
msousa@481: return NULL;
msousa@481: }
msousa@481:
msousa@481: 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@465: add_datatype_to_candidate_list(symbol, prev_instruction_type);
msousa@417: }
msousa@417: }
msousa@453: if (debug) std::cout << "XORN [" << 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@479: void *fill_candidate_datatypes_c::visit(ADD_operator_c *symbol) {return handle_binary_operator(widen_ADD_table, symbol, prev_il_instruction, il_operand);}
msousa@479: void *fill_candidate_datatypes_c::visit(SUB_operator_c *symbol) {return handle_binary_operator(widen_SUB_table, symbol, prev_il_instruction, il_operand);}
msousa@479: void *fill_candidate_datatypes_c::visit(MUL_operator_c *symbol) {return handle_binary_operator(widen_MUL_table, symbol, prev_il_instruction, il_operand);}
msousa@479: void *fill_candidate_datatypes_c::visit(DIV_operator_c *symbol) {return handle_binary_operator(widen_DIV_table, symbol, prev_il_instruction, il_operand);}
msousa@480: void *fill_candidate_datatypes_c::visit(MOD_operator_c *symbol) {return handle_binary_operator(widen_MOD_table, symbol, prev_il_instruction, il_operand);}
msousa@480:
msousa@480:
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@465: if (found) add_datatype_to_candidate_list(symbol, &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@465: if (found) add_datatype_to_candidate_list(symbol, &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@465: if (found) add_datatype_to_candidate_list(symbol, &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@465: if (found) add_datatype_to_candidate_list(symbol, &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@465: if (found) add_datatype_to_candidate_list(symbol, &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@465: if (found) add_datatype_to_candidate_list(symbol, &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@465: add_datatype_to_candidate_list(symbol, 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@472: if (is_ANY_BOOL_compatible(prev_il_instruction->candidate_datatypes[i]))
msousa@465: add_datatype_to_candidate_list(symbol, 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@472: if (is_ANY_BOOL_compatible(prev_il_instruction->candidate_datatypes[i]))
msousa@465: add_datatype_to_candidate_list(symbol, 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@465: add_datatype_to_candidate_list(symbol, 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@472: if (is_ANY_BOOL_compatible(prev_il_instruction->candidate_datatypes[i]))
msousa@465: add_datatype_to_candidate_list(symbol, 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@472: if (is_ANY_BOOL_compatible(prev_il_instruction->candidate_datatypes[i]))
msousa@465: add_datatype_to_candidate_list(symbol, 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@465: add_datatype_to_candidate_list(symbol, 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@472: if (is_ANY_BOOL_compatible(prev_il_instruction->candidate_datatypes[i]))
msousa@465: add_datatype_to_candidate_list(symbol, 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@472: if (is_ANY_BOOL_compatible(prev_il_instruction->candidate_datatypes[i]))
msousa@465: add_datatype_to_candidate_list(symbol, 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@481: void *fill_candidate_datatypes_c::visit(or_expression_c *symbol) {return handle_binary_expression(widen_OR_table, symbol, symbol->l_exp, symbol->r_exp);}
msousa@481: void *fill_candidate_datatypes_c::visit(xor_expression_c *symbol) {return handle_binary_expression(widen_XOR_table, symbol, symbol->l_exp, symbol->r_exp);}
msousa@481: void *fill_candidate_datatypes_c::visit(and_expression_c *symbol) {return handle_binary_expression(widen_AND_table, symbol, symbol->l_exp, symbol->r_exp);}
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@465: if (found) add_datatype_to_candidate_list(symbol, &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@465: add_datatype_to_candidate_list(symbol, &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@465: add_datatype_to_candidate_list(symbol, &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@465: add_datatype_to_candidate_list(symbol, &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@465: add_datatype_to_candidate_list(symbol, &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@465: add_datatype_to_candidate_list(symbol, &search_constant_type_c::bool_type_name);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@479:
msousa@479: /* The following code is correct when handling the addition of 2 symbolic_variables
msousa@479: * In this case, adding two variables (e.g. USINT_var1 + USINT_var2) will always yield
msousa@479: * the same data type, even if the result of the adition could not fit inside the same
msousa@479: * data type (due to overflowing)
msousa@479: *
msousa@479: * However, when adding two literals (e.g. USINT#42 + USINT#3)
msousa@479: * we should be able to detect overflows of the result, and therefore not consider
msousa@479: * that the result may be of type USINT.
msousa@479: * Currently we do not yet detect these overflows, and allow handling the sum of two USINTs
msousa@479: * as always resulting in an USINT, even in the following expression
msousa@479: * (USINT#65535 + USINT#2).
msousa@479: *
msousa@479: * In the future we can add some code to reduce
msousa@479: * all the expressions that are based on literals into the resulting literal
msousa@479: * value (maybe some visitor class that will run before or after data type
msousa@479: * checking). Since this class will have to be very careful to make sure it implements the same mathematical
msousa@479: * details (e.g. how to round and truncate numbers) as defined in IEC 61131-3, we will leave this to the future.
msousa@479: * Also, the question will arise if we should also replace calls to standard
msousa@479: * functions if the input parameters are all literals (e.g. ADD(42, 42)). This
msousa@479: * means this class will be more difficult than it appears at first.
msousa@479: */
msousa@479: void *fill_candidate_datatypes_c::visit(add_expression_c *symbol) {return handle_binary_expression(widen_ADD_table, symbol, symbol->l_exp, symbol->r_exp);}
msousa@479: void *fill_candidate_datatypes_c::visit(sub_expression_c *symbol) {return handle_binary_expression(widen_SUB_table, symbol, symbol->l_exp, symbol->r_exp);}
msousa@479: void *fill_candidate_datatypes_c::visit(mul_expression_c *symbol) {return handle_binary_expression(widen_MUL_table, symbol, symbol->l_exp, symbol->r_exp);}
msousa@479: void *fill_candidate_datatypes_c::visit(div_expression_c *symbol) {return handle_binary_expression(widen_DIV_table, symbol, symbol->l_exp, symbol->r_exp);}
msousa@480: void *fill_candidate_datatypes_c::visit(mod_expression_c *symbol) {return handle_binary_expression(widen_MOD_table, symbol, symbol->l_exp, symbol->r_exp);}
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@465: add_datatype_to_candidate_list(symbol, 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@465: add_datatype_to_candidate_list(symbol, 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@465: add_datatype_to_candidate_list(symbol, 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@465: add_datatype_to_candidate_list(symbol, 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@455: symbol_c *fb_type_id = search_varfb_instance_type->get_basetype_id(symbol->fb_name);
msousa@455: /* Although a call to a non-declared FB is a semantic error, this is currently caught by stage 2! */
msousa@455: if (NULL == fb_type_id) ERROR;
msousa@455:
msousa@455: function_block_declaration_c *fb_decl = function_block_type_symtable.find_value(fb_type_id);
msousa@455: if (function_block_type_symtable.end_value() == fb_decl)
msousa@455: /* The fb_name not the name of a FB instance. Most probably it is the name of a variable of some other type. */
msousa@455: fb_decl = NULL;
msousa@455:
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@455:
msousa@455: if (symbol-> formal_param_list != NULL) symbol->formal_param_list->accept(*this);
msousa@455: if (symbol->nonformal_param_list != NULL) symbol->nonformal_param_list->accept(*this);
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: