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: * Narrow class select and store a data type from candidate data types list for all symbols
msousa@417: */
msousa@417:
msousa@417: #include "narrow_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:
msousa@417: /* set to 1 to see debug info during execution */
msousa@417: static int debug = 0;
msousa@417:
msousa@417: narrow_candidate_datatypes_c::narrow_candidate_datatypes_c(symbol_c *ignore) {
msousa@417: }
msousa@417:
msousa@417: narrow_candidate_datatypes_c::~narrow_candidate_datatypes_c(void) {
msousa@417: }
msousa@417:
msousa@425:
msousa@425: /* Only set the symbol's desired datatype to 'datatype' if that datatype is in the candidate_datatype list */
msousa@425: static void set_datatype(symbol_c *datatype, symbol_c *symbol) {
msousa@425: symbol->datatype = NULL;
conti@445: if (search_in_candidate_datatype_list(datatype, symbol->candidate_datatypes) >= 0)
msousa@425: symbol->datatype = datatype;
msousa@425: }
msousa@425:
msousa@425:
msousa@425:
msousa@425:
msousa@417: bool narrow_candidate_datatypes_c::is_widening_compatible(symbol_c *left_type, symbol_c *right_type, symbol_c *result_type, const struct widen_entry widen_table[]) {
msousa@417: for (int k = 0; NULL != widen_table[k].left; k++) {
msousa@417: if ((typeid(*left_type) == typeid(*widen_table[k].left))
msousa@417: && (typeid(*right_type) == typeid(*widen_table[k].right))
msousa@417: && (typeid(*result_type) == typeid(*widen_table[k].result))) {
msousa@417: return true;
msousa@417: }
msousa@417: }
msousa@417: return false;
msousa@417: }
msousa@417:
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@421: void narrow_candidate_datatypes_c::narrow_nonformal_call(symbol_c *f_call, symbol_c *f_decl, int *ext_parm_count) {
msousa@417: symbol_c *call_param_value, *param_type;
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@421: if (NULL != ext_parm_count) *ext_parm_count = -1;
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: /* Obtaining the type of the value being passed in the function call */
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@424: /* This error should have been caught in fill_candidate_datatypes_c, but may occur here again when we handle FB invocations!
msousa@424: * In this case, we carry on analysing the code in order to be able to provide relevant error messages
msousa@424: * for that code too!
msousa@424: */
msousa@424: if(param_name == NULL) break;
msousa@417: } while ((strcmp(param_name->value, "EN") == 0) || (strcmp(param_name->value, "ENO") == 0));
msousa@417:
msousa@421: /* Set the desired datatype for this parameter, and call it recursively. */
msousa@424: /* Note that if the call has more parameters than those declared in the function/FB declaration,
msousa@424: * we may be setting this to NULL!
msousa@424: */
msousa@425: symbol_c *desired_datatype = base_type(fp_iterator.param_type());
msousa@425: if ((NULL != param_name) && (NULL == desired_datatype)) ERROR;
msousa@425: if ((NULL == param_name) && (NULL != desired_datatype)) ERROR;
msousa@425:
msousa@443: /* NOTE: When we are handling a nonformal function call made from IL, the first parameter is the 'default' or 'current'
msousa@451: * il value. However, a pointer to a copy of the prev_il_instruction is pre-pended into the operand list, so
msousa@443: * the call
msousa@443: * call_param_value->accept(*this);
msousa@451: * may actually be calling an object of the base symbol_c .
msousa@443: */
msousa@425: set_datatype(desired_datatype, call_param_value);
msousa@451: call_param_value->accept(*this);
msousa@421:
msousa@424: if (NULL != param_name)
msousa@424: if (extensible_parameter_highest_index < fp_iterator.extensible_param_index())
msousa@424: extensible_parameter_highest_index = fp_iterator.extensible_param_index();
msousa@424: }
msousa@421: /* In the case of a call to an extensible function, we store the highest index
msousa@421: * of the extensible parameters this particular call uses, in the symbol_c object
msousa@421: * of the function call itself!
msousa@421: * In calls to non-extensible functions, this value will be set to -1.
msousa@421: * This information is later used in stage4 to correctly generate the
msousa@421: * output code.
msousa@421: */
msousa@421: if ((NULL != ext_parm_count) && (extensible_parameter_highest_index >=0) /* if call to extensible function */)
msousa@421: *ext_parm_count = 1 + extensible_parameter_highest_index - fp_iterator.first_extensible_param_index();
msousa@421: }
msousa@421:
msousa@421:
msousa@421:
msousa@421: void narrow_candidate_datatypes_c::narrow_formal_call(symbol_c *f_call, symbol_c *f_decl, int *ext_parm_count) {
msousa@417: symbol_c *call_param_value, *call_param_name, *param_type;
msousa@417: symbol_c *verify_duplicate_param;
msousa@417: identifier_c *param_name;
msousa@417: function_param_iterator_c fp_iterator(f_decl);
msousa@417: function_call_param_iterator_c fcp_iterator(f_call);
msousa@417: int extensible_parameter_highest_index = -1;
msousa@417: identifier_c *extensible_parameter_name;
msousa@417: unsigned int i;
msousa@417:
msousa@421: if (NULL != ext_parm_count) *ext_parm_count = -1;
msousa@417: /* Iterating through the formal parameters of the function call */
msousa@417: while((call_param_name = fcp_iterator.next_f()) != NULL) {
msousa@417:
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@417: /* Find the corresponding parameter in function declaration */
msousa@417: param_name = fp_iterator.search(call_param_name);
msousa@417:
msousa@421: /* Set the desired datatype for this parameter, and call it recursively. */
msousa@424: /* NOTE: When handling a FB call, this narrow_formal_call() may be called to analyse
msousa@424: * an invalid FB call (call with parameters that do not exist on the FB declaration).
msousa@424: * For this reason, the param_name may come out as NULL!
msousa@424: */
msousa@425: symbol_c *desired_datatype = base_type(fp_iterator.param_type());
msousa@425: if ((NULL != param_name) && (NULL == desired_datatype)) ERROR;
msousa@425: if ((NULL == param_name) && (NULL != desired_datatype)) ERROR;
msousa@425:
msousa@450: /* set the desired data type for this parameter */
msousa@425: set_datatype(desired_datatype, call_param_value);
msousa@450: /* And recursively call that parameter/expression, so it can propagate that info */
msousa@451: call_param_value->accept(*this);
msousa@421:
msousa@455: /* set the extensible_parameter_highest_index, which will be needed in stage 4 */
msousa@455: /* This value says how many extensible parameters are being passed to the standard function */
msousa@424: if (NULL != param_name)
msousa@424: if (extensible_parameter_highest_index < fp_iterator.extensible_param_index())
msousa@424: extensible_parameter_highest_index = fp_iterator.extensible_param_index();
msousa@421: }
msousa@421: /* call is compatible! */
msousa@421:
msousa@421: /* In the case of a call to an extensible function, we store the highest index
msousa@417: * of the extensible parameters this particular call uses, in the symbol_c object
msousa@417: * of the function call itself!
msousa@417: * In calls to non-extensible functions, this value will be set to -1.
msousa@417: * This information is later used in stage4 to correctly generate the
msousa@417: * output code.
msousa@417: */
msousa@421: if ((NULL != ext_parm_count) && (extensible_parameter_highest_index >=0) /* if call to extensible function */)
msousa@421: *ext_parm_count = 1 + extensible_parameter_highest_index - fp_iterator.first_extensible_param_index();
msousa@421: }
msousa@421:
msousa@421:
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: void narrow_candidate_datatypes_c::narrow_function_invocation(symbol_c *fcall, generic_function_call_t fcall_data) {
msousa@438: /* set the called_function_declaration. */
msousa@438: fcall_data.called_function_declaration = NULL;
msousa@438:
msousa@438: /* set the called_function_declaration taking into account the datatype that we need to return */
msousa@438: for(unsigned int i = 0; i < fcall->candidate_datatypes.size(); i++) {
msousa@438: if (is_type_equal(fcall->candidate_datatypes[i], fcall->datatype)) {
msousa@438: fcall_data.called_function_declaration = fcall_data.candidate_functions[i];
msousa@438: break;
msousa@438: }
msousa@438: }
msousa@438:
msousa@438: /* NOTE: If we can't figure out the declaration of the function being called, this is not
msousa@438: * necessarily an internal compiler error. It could be because the symbol->datatype is NULL
msousa@438: * (because the ST code being analysed has an error _before_ this function invocation).
msousa@438: * However, we don't just give, up, we carry on recursivly analysing the code, so as to be
msousa@438: * able to print out any error messages related to the parameters being passed in this function
msousa@438: * invocation.
msousa@438: */
msousa@438: /* if (NULL == symbol->called_function_declaration) ERROR; */
msousa@438: if (fcall->candidate_datatypes.size() == 1) {
msousa@438: /* If only one function declaration, then we use that (even if symbol->datatypes == NULL)
msousa@438: * so we can check for errors in the expressions used to pass parameters in this
msousa@438: * function invocation.
msousa@438: */
msousa@438: fcall_data.called_function_declaration = fcall_data.candidate_functions[0];
msousa@438: }
msousa@438:
msousa@438: /* If an overloaded function is being invoked, and we cannot determine which version to use,
msousa@438: * then we can not meaningfully verify the expressions used inside that function invocation.
msousa@438: * We simply give up!
msousa@438: */
msousa@438: if (NULL == fcall_data.called_function_declaration)
msousa@438: return;
msousa@438:
msousa@438: if (NULL != fcall_data.nonformal_operand_list) narrow_nonformal_call(fcall, fcall_data.called_function_declaration, &(fcall_data.extensible_param_count));
msousa@438: if (NULL != fcall_data. formal_operand_list) narrow_formal_call(fcall, fcall_data.called_function_declaration, &(fcall_data.extensible_param_count));
msousa@438:
msousa@438: return;
msousa@438: }
msousa@438:
msousa@438:
msousa@417:
msousa@448:
msousa@448: /* narrow implicit FB call in IL.
msousa@448: * e.g. CLK ton_var
msousa@448: * CU counter_var
msousa@448: *
msousa@448: * The algorithm will be to build a fake il_fb_call_c equivalent to the implicit IL FB call, and let
msousa@448: * the visit(il_fb_call_c *) method handle it!
msousa@448: */
msousa@448: void narrow_candidate_datatypes_c::narrow_implicit_il_fb_call(symbol_c *il_instruction, const char *param_name, symbol_c *&called_fb_declaration) {
msousa@455:
msousa@455: /* set the datatype of the il_operand, this is, the FB being called! */
msousa@455: if (NULL != il_operand) {
msousa@455: /* only set it if it is in the candidate datatypes list! */
msousa@455: set_datatype(called_fb_declaration, il_operand);
msousa@455: il_operand->accept(*this);
msousa@455: }
msousa@455: symbol_c *fb_decl = il_operand->datatype;
msousa@455:
msousa@448: if (NULL == prev_il_instruction) {
msousa@448: /* This IL implicit FB call (e.g. CLK ton_var) is not preceded by another IL instruction
msousa@448: * (or list of instructions) that will set the IL current/default value.
msousa@451: * We cannot proceed verifying type compatibility of something that does not exist.
msousa@448: */
msousa@448: return;
msousa@448: }
msousa@448:
msousa@455: if (NULL == fb_decl) {
msousa@455: /* the il_operand is a not FB instance */
msousa@455: /* so we simply pass on the required datatype to the prev_il_instruction */
msousa@455: /* The invalid FB invocation will be caught by the print_datatypes_error_c by analysing NULL value in il_operand->datatype! */
msousa@455: prev_il_instruction->datatype = il_instruction->datatype;
msousa@455: return;
msousa@455: }
msousa@455:
msousa@455:
msousa@451: /* The value being passed to the 'param_name' parameter is actually the prev_il_instruction.
msousa@451: * However, we do not place that object directly in the fake il_param_list_c that we will be
msousa@451: * creating, since the visit(il_fb_call_c *) method will recursively call every object in that list.
msousa@451: * The il_prev_intruction object will be visited once we have handled this implici IL FB call
msousa@451: * (called from the instruction_list_c for() loop that works backwards). We DO NOT want to visit it twice.
msousa@451: * (Anyway, if we let the visit(il_fb_call_c *) recursively visit the current prev_il_instruction, this pointer
msousa@451: * would be changed to the IL instruction coming before the current prev_il_instruction! => things would get all messed up!)
msousa@451: * The easiest way to work around this is to simply use a new object, and copy the relevant details to that object!
msousa@451: */
msousa@451: symbol_c param_value = *prev_il_instruction;
msousa@455:
msousa@448: identifier_c variable_name(param_name);
msousa@448: // SYM_REF1(il_assign_operator_c, variable_name)
msousa@448: il_assign_operator_c il_assign_operator(&variable_name);
msousa@448: // SYM_REF3(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list)
msousa@451: il_param_assignment_c il_param_assignment(&il_assign_operator, ¶m_value/*il_operand*/, NULL);
msousa@448: il_param_list_c il_param_list;
msousa@448: il_param_list.add_element(&il_param_assignment);
msousa@448: // SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list, symbol_c *called_fb_declaration)
msousa@455: CAL_operator_c CAL_operator;
msousa@455: il_fb_call_c il_fb_call(&CAL_operator, il_operand, NULL, &il_param_list);
msousa@455:
msousa@448: /* A FB call does not return any datatype, but the IL instructions that come after this
msousa@448: * FB call may require a specific datatype in the il current/default variable,
msousa@448: * so we must pass this information up to the IL instruction before the FB call, since it will
msousa@448: * be that IL instruction that will be required to produce the desired dtataype.
msousa@448: *
msousa@448: * The above will be done by the visit(il_fb_call_c *) method, so we must make sure to
msousa@448: * correctly set up the il_fb_call.datatype variable!
msousa@448: */
msousa@455: // copy_candidate_datatype_list(il_instruction/*from*/, &il_fb_call/*to*/);
msousa@455: il_fb_call.called_fb_declaration = called_fb_declaration;
msousa@448: il_fb_call.accept(*this);
msousa@455:
msousa@451: /* set the required datatype of the previous IL instruction! */
msousa@451: /* NOTE:
msousa@451: * When handling these implicit IL calls, the parameter_value being passed to the FB parameter
msousa@451: * is actually the prev_il_instruction.
msousa@451: *
msousa@451: * However, since the FB call does not change the value in the current/default IL variable, this value
msousa@451: * must also be used ny the IL instruction coming after this FB call.
msousa@451: *
msousa@451: * This means that we have two consumers/users for the same value.
msousa@451: * We must therefore check whether the datatype required by the IL instructions following this FB call
msousa@451: * is the same as that required for the first parameter. If not, then we have a semantic error,
msousa@451: * and we set it to NULL.
msousa@451: *
msousa@451: * However, we only do that if:
msousa@451: * - The IL instruction that comes after this IL FB call actually asked this FB call for a specific
msousa@451: * datatype in the current/default vairable, once this IL FB call returns.
msousa@451: * However, sometimes, (for e.g., this FB call is the last in the IL list) the subsequent FB to not aks this
msousa@451: * FB call for any datatype. In that case, then the datatype required to pass to the first parameter of the
msousa@451: * FB call must be left unchanged!
msousa@451: */
msousa@455: if ((NULL == il_instruction->datatype) || (is_type_equal(param_value.datatype, il_instruction->datatype))) {
msousa@455: prev_il_instruction->datatype = param_value.datatype;
msousa@455: } else {
msousa@455: prev_il_instruction->datatype = NULL;
msousa@455: }
msousa@448: }
msousa@448:
msousa@448:
msousa@417: /* a helper function... */
msousa@417: symbol_c *narrow_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@423: if (symbol == NULL) return NULL;
msousa@423: 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: /**********************/
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 *narrow_candidate_datatypes_c::visit(subrange_c *symbol) {
msousa@417: symbol->lower_limit->datatype = symbol->datatype;
msousa@417: symbol->lower_limit->accept(*this);
msousa@417: symbol->upper_limit->datatype = symbol->datatype;
msousa@417: symbol->upper_limit->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@443: /* simple_specification ASSIGN constant */
msousa@443: // SYM_REF2(simple_spec_init_c, simple_specification, constant)
msousa@443: void *narrow_candidate_datatypes_c::visit(simple_spec_init_c *symbol) {
msousa@443: symbol_c *datatype = base_type(symbol->simple_specification);
msousa@443: if (NULL != symbol->constant) {
conti@445: int typeoffset = search_in_candidate_datatype_list(datatype, symbol->constant->candidate_datatypes);
msousa@443: if (typeoffset >= 0)
msousa@443: symbol->constant->datatype = symbol->constant->candidate_datatypes[typeoffset];
msousa@443: }
msousa@443: return NULL;
msousa@443: }
msousa@417:
msousa@417: /*********************/
msousa@417: /* B 1.4 - Variables */
msousa@417: /*********************/
msousa@417:
msousa@417: /********************************************/
msousa@417: /* B 1.4.1 - Directly Represented Variables */
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 *narrow_candidate_datatypes_c::visit(array_variable_c *symbol) {
msousa@417: /* we need to check the data types of the expressions used for the subscripts... */
msousa@417: symbol->subscript_list->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: /* subscript_list ',' subscript */
msousa@417: // SYM_LIST(subscript_list_c)
msousa@417: void *narrow_candidate_datatypes_c::visit(subscript_list_c *symbol) {
msousa@417: for (int i = 0; i < symbol->n; i++) {
msousa@417: for (unsigned int k = 0; k < symbol->elements[i]->candidate_datatypes.size(); k++) {
msousa@417: if (is_ANY_INT_type(symbol->elements[i]->candidate_datatypes[k]))
msousa@417: symbol->elements[i]->datatype = symbol->elements[i]->candidate_datatypes[k];
msousa@417: }
msousa@417: symbol->elements[i]->accept(*this);
msousa@417: }
msousa@417: return NULL;
msousa@417: }
msousa@417:
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 *narrow_candidate_datatypes_c::visit(function_declaration_c *symbol) {
msousa@417: search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
msousa@443: symbol->var_declarations_list->accept(*this);
msousa@417: if (debug) printf("Narrowing candidate data types list in body of function %s\n", ((token_c *)(symbol->derived_function_name))->value);
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 *narrow_candidate_datatypes_c::visit(function_block_declaration_c *symbol) {
msousa@417: search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
msousa@443: symbol->var_declarations->accept(*this);
msousa@417: if (debug) printf("Narrowing candidate data types list in body of FB %s\n", ((token_c *)(symbol->fblock_name))->value);
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 *narrow_candidate_datatypes_c::visit(program_declaration_c *symbol) {
msousa@417: search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
msousa@443: symbol->var_declarations->accept(*this);
msousa@417: if (debug) printf("Narrowing candidate data types list in body of program %s\n", ((token_c *)(symbol->program_type_name))->value);
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: /* B 1.7 Configuration elements */
msousa@417: /********************************/
msousa@417: void *narrow_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: /****************************************/
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@443: void *narrow_candidate_datatypes_c::visit(instruction_list_c *symbol) {
msousa@450: /* In order to execute the narrow algoritm correctly, we need to go through the instructions backwards,
msousa@450: * so we can not use the base class' visitor
msousa@450: */
msousa@443: for(int i = symbol->n-1; i >= 0; i--) {
msousa@443: symbol->elements[i]->accept(*this);
msousa@443: }
msousa@443: return NULL;
msousa@443: }
msousa@443:
msousa@443: /* | label ':' [il_incomplete_instruction] eol_list */
msousa@443: // SYM_REF2(il_instruction_c, label, il_instruction)
msousa@443: // void *visit(instruction_list_c *symbol);
msousa@443: void *narrow_candidate_datatypes_c::visit(il_instruction_c *symbol) {
msousa@448: if (NULL == symbol->il_instruction) {
msousa@448: /* this empty/null il_instruction cannot generate the desired datatype. We pass on the request to the previous il instruction. */
msousa@448: if (NULL != symbol->prev_il_instruction)
msousa@448: symbol->prev_il_instruction->datatype = symbol->datatype;
msousa@448: } else {
msousa@448: /* Tell the il_instruction the datatype that it must generate - this was chosen by the next il_instruction (remember: we are iterating backwards!) */
msousa@448: symbol->il_instruction->datatype = symbol->datatype;
msousa@450: prev_il_instruction = symbol->prev_il_instruction;
msousa@448: symbol->il_instruction->accept(*this);
msousa@450: prev_il_instruction = NULL;
msousa@450: }
msousa@450: return NULL;
msousa@450: }
msousa@444:
msousa@444:
msousa@444:
msousa@444:
msousa@417: // void *visit(instruction_list_c *symbol);
msousa@417: void *narrow_candidate_datatypes_c::visit(il_simple_operation_c *symbol) {
msousa@443: /* Tell the il_simple_operator the datatype that it must generate - this was chosen by the next il_instruction (we iterate backwards!) */
msousa@443: symbol->il_simple_operator->datatype = symbol->datatype;
msousa@443: /* recursive call to see whether data types are compatible */
msousa@417: il_operand = symbol->il_operand;
msousa@417: symbol->il_simple_operator->accept(*this);
msousa@417: il_operand = NULL;
msousa@417: return NULL;
msousa@417: }
msousa@417:
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 *narrow_candidate_datatypes_c::visit(il_function_call_c *symbol) {
msousa@451: /* The first parameter of a non formal function call in IL will be the 'current value' (i.e. the prev_il_instruction)
msousa@451: * 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@451: * However, since handle_function_call() will be recursively calling all parameter, and we don't want
msousa@451: * to do that for the prev_il_instruction (since it has already been visited by the fill_candidate_datatypes_c)
msousa@451: * we create a new ____ symbol_c ____ object, and copy the relevant info to/from that object before/after
msousa@451: * the call to handle_function_call().
msousa@451: *
msousa@451: * However, if no further paramters are given, then il_operand_list will be NULL, and we will
msousa@451: * need to create a new object to hold the pointer to prev_il_instruction.
msousa@451: * This change will also be undone later in print_datatypes_error_c.
msousa@451: */
msousa@451: symbol_c param_value;
msousa@451: if (NULL == symbol->il_operand_list) symbol->il_operand_list = new il_operand_list_c;
msousa@451: if (NULL == symbol->il_operand_list) ERROR;
msousa@451:
msousa@451: if (NULL != prev_il_instruction)
msousa@451: param_value = *prev_il_instruction;
msousa@451: ((list_c *)symbol->il_operand_list)->insert_element(¶m_value, 0);
msousa@451:
msousa@438: generic_function_call_t fcall_param = {
msousa@441: /* fcall_param.function_name = */ symbol->function_name,
msousa@441: /* fcall_param.nonformal_operand_list = */ symbol->il_operand_list,
msousa@441: /* fcall_param.formal_operand_list = */ NULL,
msousa@441: /* enum {POU_FB, POU_function} POU_type = */ generic_function_call_t::POU_function,
msousa@441: /* fcall_param.candidate_functions = */ symbol->candidate_functions,
msousa@441: /* fcall_param.called_function_declaration = */ symbol->called_function_declaration,
msousa@441: /* fcall_param.extensible_param_count = */ symbol->extensible_param_count
msousa@438: };
msousa@438:
msousa@438: narrow_function_invocation(symbol, fcall_param);
msousa@451: if (NULL != prev_il_instruction)
msousa@451: prev_il_instruction->datatype = param_value.datatype;
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: 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@417: return NULL;
msousa@417: }
msousa@417:
msousa@452:
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 *narrow_candidate_datatypes_c::visit(il_expression_c *symbol) {
msousa@453: /* first handle the operation (il_expr_operator) that will use the result coming from the parenthesised IL list (i.e. simple_instr_list) */
msousa@453: symbol->il_expr_operator->datatype = symbol->datatype;
msousa@454: il_operand = symbol->simple_instr_list; /* This is not a bug! The parenthesised expression will be used as the operator! */
msousa@453: symbol->il_expr_operator->accept(*this);
msousa@453:
msousa@453: /* now give the parenthesised IL list a chance to narrow the datatypes */
msousa@454: /* The datatype that is must return was set by the call symbol->il_expr_operator->accept(*this) */
msousa@453: symbol_c *save_prev_il_instruction = prev_il_instruction; /*this is not really necessary, but lets play it safe */
msousa@452: symbol->simple_instr_list->accept(*this);
msousa@452: prev_il_instruction = save_prev_il_instruction;
msousa@417: return NULL;
msousa@417: }
msousa@417:
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 *narrow_candidate_datatypes_c::visit(il_fb_call_c *symbol) {
msousa@455: symbol_c *fb_decl = symbol->called_fb_declaration;
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: if (NULL != symbol->il_operand_list) narrow_nonformal_call(symbol, fb_decl);
msousa@439: if (NULL != symbol-> il_param_list) narrow_formal_call(symbol, fb_decl);
msousa@439:
msousa@455: /* Let the il_call_operator (CAL, CALC, or CALCN) set the datatype of prev_il_instruction... */
msousa@455: symbol->il_call_operator->datatype = symbol->datatype;
msousa@455: symbol->il_call_operator->accept(*this);
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 *narrow_candidate_datatypes_c::visit(il_formal_funct_call_c *symbol) {
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:
msousa@438: narrow_function_invocation(symbol, fcall_param);
msousa@450: /* The desired datatype of the previous il instruction was already set by narrow_function_invocation() */
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@452: // void *visit(il_operand_list_c *symbol);
msousa@453:
msousa@453:
msousa@453: /* | simple_instr_list il_simple_instruction */
msousa@453: /* This object is referenced by il_expression_c objects */
msousa@452: void *narrow_candidate_datatypes_c::visit(simple_instr_list_c *symbol) {
msousa@452: if (symbol->n > 0)
msousa@452: symbol->elements[symbol->n - 1]->datatype = symbol->datatype;
msousa@452:
msousa@452: for(int i = symbol->n-1; i >= 0; i--) {
msousa@452: symbol->elements[i]->accept(*this);
msousa@452: }
msousa@452: return NULL;
msousa@452: }
msousa@452:
msousa@453:
msousa@453: // SYM_REF1(il_simple_instruction_c, il_simple_instruction, symbol_c *prev_il_instruction;)
msousa@453: void *narrow_candidate_datatypes_c::visit(il_simple_instruction_c *symbol) {
msousa@453: prev_il_instruction = symbol->prev_il_instruction;
msousa@453: symbol->il_simple_instruction->datatype = symbol->datatype;
msousa@453: symbol->il_simple_instruction->accept(*this);
msousa@453: prev_il_instruction = NULL;
msousa@453: return NULL;
msousa@453: }
msousa@453:
msousa@452: // void *visit(il_param_list_c *symbol);
msousa@452: // void *visit(il_param_assignment_c *symbol);
msousa@452: // void *visit(il_param_out_assignment_c *symbol);
msousa@452:
msousa@417:
msousa@417: /*******************/
msousa@417: /* B 2.2 Operators */
msousa@417: /*******************/
msousa@443:
msousa@443: void *narrow_candidate_datatypes_c::handle_il_instruction(symbol_c *symbol) {
msousa@443: if (NULL == symbol->datatype)
msousa@443: /* next IL instructions were unable to determine the datatype this instruction should produce */
msousa@443: return NULL;
msousa@454: /* NOTE 1: the il_operand __may__ be pointing to a parenthesized list of IL instructions.
msousa@454: * e.g. LD 33
msousa@454: * AND ( 45
msousa@454: * OR 56
msousa@454: * )
msousa@454: * When we handle the first 'AND' IL_operator, the il_operand will point to an simple_instr_list_c.
msousa@454: * In this case, when we call il_operand->accept(*this);, the prev_il_instruction pointer will be overwritten!
msousa@454: *
msousa@454: * We must therefore set the prev_il_instruction->datatype = symbol->datatype;
msousa@454: * __before__ calling il_operand->accept(*this) !!
msousa@454: *
msousa@454: * NOTE 2: We do not need to call prev_il_instruction->accept(*this), as the object to which prev_il_instruction
msousa@454: * is pointing to will be later narrowed by the call from the for() loop of the instruction_list_c
msousa@454: * (or simple_instr_list_c), which iterates backwards.
msousa@454: */
msousa@454: /* set the desired datatype of the previous il instruction */
msousa@454: prev_il_instruction->datatype = symbol->datatype;
msousa@443: /* set the datatype for the operand */
msousa@443: il_operand->datatype = symbol->datatype;
msousa@443: il_operand->accept(*this);
msousa@443: return NULL;
msousa@443: }
msousa@443:
msousa@443: void *narrow_candidate_datatypes_c::visit(LD_operator_c *symbol) {
msousa@443: if (NULL == symbol->datatype)
msousa@443: /* next IL instructions were unable to determine the datatype this instruction should produce */
msousa@443: return NULL;
msousa@443: /* set the datatype for the operand */
msousa@443: il_operand->datatype = symbol->datatype;
msousa@443: il_operand->accept(*this);
msousa@443: return NULL;
msousa@443: }
msousa@443:
msousa@443:
msousa@443: void *narrow_candidate_datatypes_c::visit(LDN_operator_c *symbol) {
msousa@443: if (NULL == symbol->datatype)
msousa@443: /* next IL instructions were unable to determine the datatype this instruction should produce */
msousa@443: return NULL;
msousa@443: /* set the datatype for the operand */
msousa@443: il_operand->datatype = symbol->datatype;
msousa@443: il_operand->accept(*this);
msousa@443: return NULL;
msousa@443: }
msousa@443:
msousa@443: void *narrow_candidate_datatypes_c::visit(ST_operator_c *symbol) {
msousa@443: if (debug) printf("narrow_candidate_datatypes_c::visit(ST_operator_c *symbol) called.\n");
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@443: /* set the datatype for the operand */
msousa@417: il_operand->datatype = symbol->datatype;
msousa@417: il_operand->accept(*this);
msousa@443: /* set the desired datatype of the previous il instruction */
msousa@443: prev_il_instruction->datatype = symbol->datatype;
msousa@443: if (debug) printf("narrow_candidate_datatypes_c::visit(ST_operator_c *symbol) returning. previous_il_instruction->datatype = %p\n", prev_il_instruction->datatype);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(STN_operator_c *symbol) {
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@443: /* set the datatype for the operand */
msousa@417: il_operand->datatype = symbol->datatype;
msousa@417: il_operand->accept(*this);
msousa@443: /* set the desired datatype of the previous il instruction */
msousa@443: prev_il_instruction->datatype = symbol->datatype;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(NOT_operator_c *symbol) {
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@448: void *narrow_candidate_datatypes_c::visit(S_operator_c *symbol) {
msousa@448: /* TODO: what if this is a FB call? */
msousa@448: return handle_il_instruction(symbol);
msousa@448: }
msousa@448: void *narrow_candidate_datatypes_c::visit(R_operator_c *symbol) {
msousa@448: /* TODO: what if this is a FB call? */
msousa@448: return handle_il_instruction(symbol);
msousa@448: }
msousa@448:
msousa@448:
msousa@448: void *narrow_candidate_datatypes_c::visit(S1_operator_c *symbol) {
msousa@448: narrow_implicit_il_fb_call(symbol, "S1", symbol->called_fb_declaration);
msousa@448: return NULL;
msousa@448: }
msousa@448:
msousa@448: void *narrow_candidate_datatypes_c::visit(R1_operator_c *symbol) {
msousa@448: narrow_implicit_il_fb_call(symbol, "R1", symbol->called_fb_declaration);
msousa@448: return NULL;
msousa@448: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(CLK_operator_c *symbol) {
msousa@448: narrow_implicit_il_fb_call(symbol, "CLK", symbol->called_fb_declaration);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(CU_operator_c *symbol) {
msousa@448: narrow_implicit_il_fb_call(symbol, "CU", symbol->called_fb_declaration);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(CD_operator_c *symbol) {
msousa@448: narrow_implicit_il_fb_call(symbol, "CD", symbol->called_fb_declaration);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(PV_operator_c *symbol) {
msousa@448: narrow_implicit_il_fb_call(symbol, "PV", symbol->called_fb_declaration);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(IN_operator_c *symbol) {
msousa@448: narrow_implicit_il_fb_call(symbol, "IN", symbol->called_fb_declaration);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(PT_operator_c *symbol) {
msousa@448: narrow_implicit_il_fb_call(symbol, "PT", symbol->called_fb_declaration);
msousa@448: return NULL;
msousa@448: }
msousa@448:
msousa@448:
msousa@448:
msousa@448: void *narrow_candidate_datatypes_c::visit(AND_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@448: void *narrow_candidate_datatypes_c::visit(OR_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@448: void *narrow_candidate_datatypes_c::visit(XOR_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@443: void *narrow_candidate_datatypes_c::visit(ANDN_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@448: void *narrow_candidate_datatypes_c::visit(ORN_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@443: void *narrow_candidate_datatypes_c::visit(XORN_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@448: void *narrow_candidate_datatypes_c::visit(ADD_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@448: void *narrow_candidate_datatypes_c::visit(SUB_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@448: void *narrow_candidate_datatypes_c::visit(MUL_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@448: void *narrow_candidate_datatypes_c::visit(DIV_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@448: void *narrow_candidate_datatypes_c::visit(MOD_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@448: void *narrow_candidate_datatypes_c::visit(GT_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@448: void *narrow_candidate_datatypes_c::visit(GE_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@448: void *narrow_candidate_datatypes_c::visit(EQ_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@448: void *narrow_candidate_datatypes_c::visit(LT_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@448: void *narrow_candidate_datatypes_c::visit(LE_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@448: void *narrow_candidate_datatypes_c::visit(NE_operator_c *symbol) {return handle_il_instruction(symbol);}
msousa@448:
msousa@417:
msousa@455: // SYM_REF0(CAL_operator_c)
msousa@455: /* called from il_fb_call_c (symbol->il_call_operator->accpet(*this) ) */
msousa@417: void *narrow_candidate_datatypes_c::visit(CAL_operator_c *symbol) {
msousa@455: /* set the desired datatype of the previous il instruction */
msousa@455: /* This FB call does not change the value in the current/default IL variable, so we pass the required datatype to the previous IL instruction */
msousa@455: if (NULL != prev_il_instruction)
msousa@455: prev_il_instruction->datatype = symbol->datatype;
msousa@455: return NULL;
msousa@455: }
msousa@455:
msousa@455:
msousa@455: void *narrow_candidate_datatypes_c::narrow_conditional_flow_control_IL_instruction(symbol_c *symbol) {
msousa@455: /* if the next IL instructions needs us to provide a datatype other than a bool,
msousa@455: * then we have an internal compiler error - most likely in fill_candidate_datatypes_c
msousa@455: */
msousa@455: if ((NULL != symbol->datatype) && (!is_type(symbol->datatype, bool_type_name_c))) ERROR;
msousa@455: if (symbol->candidate_datatypes.size() > 1) ERROR;
msousa@455:
msousa@455: /* NOTE: If there is not IL instruction following this CALC, CALCN, JMPC, JMPC, ..., instruction,
msousa@455: * we must still provide a bool_type_name_c datatype (if possible, i.e. if it exists in the candidate datatype list).
msousa@455: * If it is not possible, we set it to NULL
msousa@455: */
msousa@455: if (symbol->candidate_datatypes.size() == 0) symbol->datatype = NULL;
msousa@455: else symbol->datatype = symbol->candidate_datatypes[0]; /* i.e. a bool_type_name_c! */
msousa@455: if ((NULL != symbol->datatype) && (!is_type(symbol->datatype, bool_type_name_c))) ERROR;
msousa@455:
msousa@455: /* set the required datatype of the previous IL instruction, i.e. a bool_type_name_c! */
msousa@455: if (NULL != prev_il_instruction) prev_il_instruction->datatype = symbol->datatype;
msousa@455: return NULL;
msousa@455: }
msousa@455:
msousa@455:
msousa@455: // SYM_REF0(CALC_operator_c)
msousa@455: /* called from il_fb_call_c (symbol->il_call_operator->accpet(*this) ) */
msousa@417: void *narrow_candidate_datatypes_c::visit(CALC_operator_c *symbol) {
msousa@455: return narrow_conditional_flow_control_IL_instruction(symbol);
msousa@455: }
msousa@455:
msousa@455:
msousa@455: // SYM_REF0(CALCN_operator_c)
msousa@455: /* called from il_fb_call_c (symbol->il_call_operator->accpet(*this) ) */
msousa@417: void *narrow_candidate_datatypes_c::visit(CALCN_operator_c *symbol) {
msousa@455: return narrow_conditional_flow_control_IL_instruction(symbol);
msousa@455: }
msousa@455:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(RET_operator_c *symbol) {
msousa@455: /* set the desired datatype of the previous il instruction */
msousa@455: /* This RET instruction does not change the value in the current/default IL variable, so we pass the required datatype to the previous IL instruction.
msousa@455: * Actually this should always be NULL, otherwise we have a bug in the flow_control_analysis_c
msousa@455: * However, since that class has not yet been completely finished, we do not yet check this assertion!
msousa@455: */
msousa@455: // if (NULL != symbol->datatype) ERROR;
msousa@455: if (NULL != prev_il_instruction)
msousa@455: prev_il_instruction->datatype = symbol->datatype;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(RETC_operator_c *symbol) {
msousa@455: return narrow_conditional_flow_control_IL_instruction(symbol);
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(RETCN_operator_c *symbol) {
msousa@455: return narrow_conditional_flow_control_IL_instruction(symbol);
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(JMP_operator_c *symbol) {
msousa@455: /* set the desired datatype of the previous il instruction */
msousa@455: /* This JMP instruction does not change the value in the current/default IL variable, so we pass the required datatype to the previous IL instruction.
msousa@455: * Actually this should always be NULL, otherwise we have a bug in the flow_control_analysis_c
msousa@455: * However, since that class has not yet been completely finished, we do not yet check this assertion!
msousa@455: */
msousa@455: // if (NULL != symbol->datatype) ERROR;
msousa@455: if (NULL != prev_il_instruction)
msousa@455: prev_il_instruction->datatype = symbol->datatype;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(JMPC_operator_c *symbol) {
msousa@455: return narrow_conditional_flow_control_IL_instruction(symbol);
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(JMPCN_operator_c *symbol) {
msousa@455: return narrow_conditional_flow_control_IL_instruction(symbol);
msousa@417: }
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: /***************************************/
msousa@417: /* B.3 - Language ST (Structured Text) */
msousa@417: /***************************************/
msousa@417: /***********************/
msousa@417: /* B 3.1 - Expressions */
msousa@417: /***********************/
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(or_expression_c *symbol) {
msousa@417: symbol_c * selected_type = NULL;
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: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(xor_expression_c *symbol) {
msousa@417: symbol_c * selected_type = NULL;
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: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(and_expression_c *symbol) {
msousa@417: symbol_c * selected_type = NULL;
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 (typeid(*symbol->l_exp->candidate_datatypes[i]) == typeid(*symbol->r_exp->candidate_datatypes[j])) {
msousa@417: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(equ_expression_c *symbol) {
msousa@417: /* Here symbol->datatype has already assigned to BOOL
msousa@417: * In conditional symbols like =, <>, =<, <, >, >= we have to set
msousa@417: * l_exp and r_exp expression matched with compatible type.
msousa@417: * Example:
msousa@417: * INT#14 = INT#81
msousa@417: * equ_expression_c symbol->datatype = BOOL from top visit
msousa@417: * symbol->l_exp->datatype => INT
msousa@417: * symbol->r_exp->datatype => INT
msousa@417: */
msousa@417: symbol_c * selected_type = NULL;
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 (typeid(*symbol->l_exp->candidate_datatypes[i]) == typeid(*symbol->r_exp->candidate_datatypes[j])) {
msousa@417: /*
msousa@417: * We do not need to check whether the type is an ANY_ELEMENTARY here.
msousa@417: * That was already done in fill_candidate_datatypes_c.
msousa@417: */
msousa@417: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@427:
msousa@427: symbol->l_exp->accept(*this);
msousa@427: symbol->r_exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(notequ_expression_c *symbol) {
msousa@417: symbol_c * selected_type = NULL;
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 (typeid(*symbol->l_exp->candidate_datatypes[i]) == typeid(*symbol->r_exp->candidate_datatypes[j])) {
msousa@417: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(lt_expression_c *symbol) {
msousa@417: symbol_c * selected_type = NULL;
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 (typeid(*symbol->l_exp->candidate_datatypes[i]) == typeid(*symbol->r_exp->candidate_datatypes[j])
msousa@417: && is_ANY_ELEMENTARY_type(symbol->l_exp->candidate_datatypes[i])) {
msousa@417: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(gt_expression_c *symbol) {
msousa@417: symbol_c * selected_type = NULL;
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 (typeid(*symbol->l_exp->candidate_datatypes[i]) == typeid(*symbol->r_exp->candidate_datatypes[j])
msousa@417: && is_ANY_ELEMENTARY_type(symbol->l_exp->candidate_datatypes[i])) {
msousa@417: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(le_expression_c *symbol) {
msousa@417: symbol_c * selected_type = NULL;
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 (typeid(*symbol->l_exp->candidate_datatypes[i]) == typeid(*symbol->r_exp->candidate_datatypes[j])
msousa@417: && is_ANY_ELEMENTARY_type(symbol->l_exp->candidate_datatypes[i])) {
msousa@417: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(ge_expression_c *symbol) {
msousa@417: symbol_c * selected_type = NULL;
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 (typeid(*symbol->l_exp->candidate_datatypes[i]) == typeid(*symbol->r_exp->candidate_datatypes[j])
msousa@417: && is_ANY_ELEMENTARY_type(symbol->l_exp->candidate_datatypes[i])) {
msousa@417: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(add_expression_c *symbol) {
msousa@417: int count = 0;
msousa@417:
msousa@417: if (is_ANY_NUM_compatible(symbol->datatype)) {
msousa@417: symbol->l_exp->datatype = symbol->datatype;
msousa@417: symbol->r_exp->datatype = symbol->datatype;
msousa@417: count++;
msousa@417: } else {
msousa@417: /* TIME data type */
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: /* test widening compatibility */
msousa@417: if (is_widening_compatible(symbol->l_exp->candidate_datatypes[i],
msousa@417: symbol->r_exp->candidate_datatypes[j],
msousa@417: symbol->datatype, widen_ADD_table)) {
msousa@417: symbol->l_exp->datatype = symbol->l_exp->candidate_datatypes[i];
msousa@417: symbol->r_exp->datatype = symbol->r_exp->candidate_datatypes[j];
msousa@417: count ++;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417: if (count > 1)
msousa@417: ERROR;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(sub_expression_c *symbol) {
msousa@417: int count = 0;
msousa@417:
msousa@417: if (is_ANY_NUM_compatible(symbol->datatype)) {
msousa@417: symbol->l_exp->datatype = symbol->datatype;
msousa@417: symbol->r_exp->datatype = symbol->datatype;
msousa@417: count++;
msousa@417: } else {
msousa@417: /* TIME data type */
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: /* test widening compatibility */
msousa@417: if (is_widening_compatible(symbol->l_exp->candidate_datatypes[i],
msousa@417: symbol->r_exp->candidate_datatypes[j],
msousa@417: symbol->datatype, widen_SUB_table)) {
msousa@417: symbol->l_exp->datatype = symbol->l_exp->candidate_datatypes[i];
msousa@417: symbol->r_exp->datatype = symbol->r_exp->candidate_datatypes[j];
msousa@417: count ++;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417: if (count > 1)
msousa@417: ERROR;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(mul_expression_c *symbol) {
msousa@417: int count = 0;
msousa@417:
msousa@417: if (is_ANY_NUM_compatible(symbol->datatype)) {
msousa@417: symbol->l_exp->datatype = symbol->datatype;
msousa@417: symbol->r_exp->datatype = symbol->datatype;
msousa@417: count++;
msousa@417: } else {
msousa@417: /* TIME data type */
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: /* test widening compatibility */
msousa@417: if (is_widening_compatible(symbol->l_exp->candidate_datatypes[i],
msousa@417: symbol->r_exp->candidate_datatypes[j],
msousa@417: symbol->datatype, widen_MUL_table)) {
msousa@417: symbol->l_exp->datatype = symbol->l_exp->candidate_datatypes[i];
msousa@417: symbol->r_exp->datatype = symbol->r_exp->candidate_datatypes[j];
msousa@417: count ++;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417: if (count > 1)
msousa@417: ERROR;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(div_expression_c *symbol) {
msousa@417: int count = 0;
msousa@417:
msousa@417: if (is_ANY_NUM_compatible(symbol->datatype)) {
msousa@417: symbol->l_exp->datatype = symbol->datatype;
msousa@417: symbol->r_exp->datatype = symbol->datatype;
msousa@417: count++;
msousa@417: } else {
msousa@417: /* TIME data type */
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: /* test widening compatibility */
msousa@417: if (is_widening_compatible(symbol->l_exp->candidate_datatypes[i],
msousa@417: symbol->r_exp->candidate_datatypes[j],
msousa@417: symbol->datatype, widen_DIV_table)) {
msousa@417: symbol->l_exp->datatype = symbol->l_exp->candidate_datatypes[i];
msousa@417: symbol->r_exp->datatype = symbol->r_exp->candidate_datatypes[j];
msousa@417: count ++;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417: if (count > 1)
msousa@417: ERROR;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(mod_expression_c *symbol) {
msousa@417: symbol->l_exp->datatype = symbol->datatype;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = symbol->datatype;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(power_expression_c *symbol) {
msousa@417: symbol->l_exp->datatype = symbol->datatype;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: if (! symbol->r_exp->candidate_datatypes.size()){
msousa@417: symbol->r_exp->datatype = symbol->r_exp->candidate_datatypes[0];
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(neg_expression_c *symbol) {
msousa@417: symbol->exp->datatype = symbol->datatype;
msousa@417: symbol->exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(not_expression_c *symbol) {
msousa@417: symbol->exp->datatype = symbol->datatype;
msousa@417: symbol->exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@438:
msousa@438: /* NOTE: The parameter 'called_function_declaration', 'extensible_param_count' and 'candidate_functions' are used to pass data between the stage 3 and stage 4. */
msousa@438: /* formal_param_list -> may be NULL ! */
msousa@438: /* nonformal_param_list -> may be NULL ! */
msousa@438: // SYM_REF3(function_invocation_c, function_name, formal_param_list, nonformal_param_list, symbol_c *called_function_declaration; int extensible_param_count; std::vector candidate_functions;)
msousa@417: void *narrow_candidate_datatypes_c::visit(function_invocation_c *symbol) {
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:
msousa@438: narrow_function_invocation(symbol, fcall_param);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: /********************/
msousa@417: /* B 3.2 Statements */
msousa@417: /********************/
msousa@417:
msousa@417:
msousa@417: /*********************************/
msousa@417: /* B 3.2.1 Assignment Statements */
msousa@417: /*********************************/
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(assignment_statement_c *symbol) {
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@417: symbol->l_exp->datatype = symbol->datatype;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = symbol->datatype;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: /*****************************************/
msousa@417: /* B 3.2.2 Subprogram Control Statements */
msousa@417: /*****************************************/
msousa@417:
msousa@423: void *narrow_candidate_datatypes_c::visit(fb_invocation_c *symbol) {
msousa@424: /* Note: We do not use the symbol->called_fb_declaration value (set in fill_candidate_datatypes_c)
msousa@424: * because we try to identify any other datatype errors in the expressions used in the
msousa@424: * parameters to the FB call (e.g. fb_var(var1 * 56 + func(var * 43)) )
msousa@424: * even it the call to the FB is invalid.
msousa@424: * This makes sense because it may be errors in those expressions which are
msousa@424: * making this an invalid call, so it makes sense to point them out to the user!
msousa@424: */
msousa@423: symbol_c *fb_decl = search_varfb_instance_type->get_basetype_decl(symbol->fb_name);
msousa@424:
msousa@424: /* Although a call to a non-declared FB is a semantic error, this is currently caught by stage 2! */
msousa@423: if (NULL == fb_decl) ERROR;
msousa@423: if (NULL != symbol->nonformal_param_list) narrow_nonformal_call(symbol, fb_decl);
msousa@423: if (NULL != symbol-> formal_param_list) narrow_formal_call(symbol, fb_decl);
msousa@423:
msousa@423: return NULL;
msousa@423: }
msousa@423:
msousa@423:
msousa@417: /********************************/
msousa@417: /* B 3.2.3 Selection Statements */
msousa@417: /********************************/
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(if_statement_c *symbol) {
msousa@417: for(unsigned int i = 0; i < symbol->expression->candidate_datatypes.size(); i++) {
msousa@417: if (is_type(symbol->expression->candidate_datatypes[i], bool_type_name_c))
msousa@417: symbol->expression->datatype = symbol->expression->candidate_datatypes[i];
msousa@417: }
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 *narrow_candidate_datatypes_c::visit(elseif_statement_c *symbol) {
msousa@417: for (unsigned int i = 0; i < symbol->expression->candidate_datatypes.size(); i++) {
msousa@417: if (is_type(symbol->expression->candidate_datatypes[i], bool_type_name_c))
msousa@417: symbol->expression->datatype = symbol->expression->candidate_datatypes[i];
msousa@417: }
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 *narrow_candidate_datatypes_c::visit(case_statement_c *symbol) {
msousa@417: for (unsigned int i = 0; i < symbol->expression->candidate_datatypes.size(); i++) {
msousa@417: if ((is_ANY_INT_type(symbol->expression->candidate_datatypes[i]))
msousa@417: || (search_base_type.type_is_enumerated(symbol->expression->candidate_datatypes[i])))
msousa@417: symbol->expression->datatype = symbol->expression->candidate_datatypes[i];
msousa@417: }
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->case_element_list) {
msousa@417: symbol->case_element_list->datatype = symbol->expression->datatype;
msousa@417: symbol->case_element_list->accept(*this);
msousa@417: }
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: /* helper symbol for case_statement */
msousa@417: // SYM_LIST(case_element_list_c)
msousa@417: void *narrow_candidate_datatypes_c::visit(case_element_list_c *symbol) {
msousa@417: for (int i = 0; i < symbol->n; i++) {
msousa@417: symbol->elements[i]->datatype = symbol->datatype;
msousa@417: symbol->elements[i]->accept(*this);
msousa@417: }
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: /* case_list ':' statement_list */
msousa@417: // SYM_REF2(case_element_c, case_list, statement_list)
msousa@417: void *narrow_candidate_datatypes_c::visit(case_element_c *symbol) {
msousa@417: symbol->case_list->datatype = symbol->datatype;
msousa@417: symbol->case_list->accept(*this);
msousa@417: symbol->statement_list->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: // SYM_LIST(case_list_c)
msousa@417: void *narrow_candidate_datatypes_c::visit(case_list_c *symbol) {
msousa@417: for (int i = 0; i < symbol->n; i++) {
msousa@417: for (unsigned int k = 0; k < symbol->elements[i]->candidate_datatypes.size(); k++) {
msousa@417: if (is_type_equal(symbol->datatype, symbol->elements[i]->candidate_datatypes[k]))
msousa@417: symbol->elements[i]->datatype = symbol->elements[i]->candidate_datatypes[k];
msousa@417: }
msousa@417: /* NOTE: this may be an integer, a subrange_c, or a enumerated value! */
msousa@417: symbol->elements[i]->accept(*this);
msousa@417: }
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: /********************************/
msousa@417: /* B 3.2.4 Iteration Statements */
msousa@417: /********************************/
msousa@417: void *narrow_candidate_datatypes_c::visit(for_statement_c *symbol) {
msousa@417: /* Control variable */
msousa@417: for(unsigned int i = 0; i < symbol->control_variable->candidate_datatypes.size(); i++) {
msousa@417: if (is_ANY_INT_type(symbol->control_variable->candidate_datatypes[i])) {
msousa@417: symbol->control_variable->datatype = symbol->control_variable->candidate_datatypes[i];
msousa@417: }
msousa@417: }
msousa@417: symbol->control_variable->accept(*this);
msousa@417: /* BEG expression */
msousa@417: for(unsigned int i = 0; i < symbol->beg_expression->candidate_datatypes.size(); i++) {
msousa@417: if (is_type_equal(symbol->control_variable->datatype,symbol->beg_expression->candidate_datatypes[i]) &&
msousa@417: is_ANY_INT_type(symbol->beg_expression->candidate_datatypes[i])) {
msousa@417: symbol->beg_expression->datatype = symbol->beg_expression->candidate_datatypes[i];
msousa@417: }
msousa@417: }
msousa@417: symbol->beg_expression->accept(*this);
msousa@417: /* END expression */
msousa@417: for(unsigned int i = 0; i < symbol->end_expression->candidate_datatypes.size(); i++) {
msousa@417: if (is_type_equal(symbol->control_variable->datatype,symbol->end_expression->candidate_datatypes[i]) &&
msousa@417: is_ANY_INT_type(symbol->end_expression->candidate_datatypes[i])) {
msousa@417: symbol->end_expression->datatype = symbol->end_expression->candidate_datatypes[i];
msousa@417: }
msousa@417: }
msousa@417: symbol->end_expression->accept(*this);
msousa@417: /* BY expression */
msousa@417: if (NULL != symbol->by_expression) {
msousa@417: for(unsigned int i = 0; i < symbol->by_expression->candidate_datatypes.size(); i++) {
msousa@417: if (is_type_equal(symbol->control_variable->datatype,symbol->by_expression->candidate_datatypes[i]) &&
msousa@417: is_ANY_INT_type(symbol->by_expression->candidate_datatypes[i])) {
msousa@417: symbol->by_expression->datatype = symbol->by_expression->candidate_datatypes[i];
msousa@417: }
msousa@417: }
msousa@417: symbol->by_expression->accept(*this);
msousa@417: }
msousa@417: if (NULL != symbol->statement_list)
msousa@417: symbol->statement_list->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(while_statement_c *symbol) {
msousa@417: for (unsigned int i = 0; i < symbol->expression->candidate_datatypes.size(); i++) {
msousa@417: if(is_BOOL_type(symbol->expression->candidate_datatypes[i]))
msousa@417: symbol->expression->datatype = symbol->expression->candidate_datatypes[i];
msousa@417: }
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: void *narrow_candidate_datatypes_c::visit(repeat_statement_c *symbol) {
msousa@417: for (unsigned int i = 0; i < symbol->expression->candidate_datatypes.size(); i++) {
msousa@417: if(is_BOOL_type(symbol->expression->candidate_datatypes[i]))
msousa@417: symbol->expression->datatype = symbol->expression->candidate_datatypes[i];
msousa@417: }
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: