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@552: /* NOTE: The algorithm implemented here assumes that candidate datatype lists have already been filled!
msousa@552: * BEFORE running this visitor, be sure to CALL the fill_candidate_datatype_c visitor!
msousa@552: */
msousa@552:
msousa@552:
msousa@417: /*
msousa@552: * Choose, from the list of all the possible datatypes each expression may take, the single datatype that it will in fact take.
msousa@552: * The resulting (chosen) datatype, will be stored in the symbol_c.datatype variable, leaving the candidate datatype list untouched!
msousa@552: *
msousa@552: * For rvalue expressions, this decision will be based on the datatype of the lvalue expression.
msousa@552: * For lvalue expressions, the candidate datatype list should have a single entry.
msousa@552: *
msousa@552: * For example, the very simple literal '0' in 'foo := 0', may represent a:
msousa@552: * BOOL, BYTE, WORD, DWORD, LWORD, USINT, SINT, UINT, INT, UDINT, DINT, ULINT, LINT (as well as the SAFE versions of these data tyes too!)
msousa@552: *
msousa@552: * In this class, the datatype of '0' will be set to the same datatype as the 'foo' variable.
msousa@552: * If the intersection of the candidate datatype lists of the left and right side expressions is empty,
msousa@552: * then a datatype error has been found, and the datatype is either left at NULL, or set to a pointer of an invalid_type_name_c object!
msousa@417: */
msousa@417:
msousa@552:
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) {
conti@661: search_varfb_instance_type = NULL;
conti@661: fake_prev_il_instruction = NULL;
msousa@674: current_il_instruction = NULL;
conti@661: il_operand = NULL;
mjsousa@889: current_scope = NULL;
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@459:
msousa@459: /* If we are trying to set to the undefined type, and the symbol's datatype has already been set to something else,
msousa@459: * we abort the compoiler as I don't think this should ever occur.
msousa@466: * NOTE: In order to handle JMPs to labels that come before the JMP itself, we run the narrow algorithm twice.
msousa@466: * This means that this situation may legally occur, so we cannot abort the compiler here!
msousa@466: */
msousa@466: // if ((NULL == datatype) && (NULL != symbol->datatype)) ERROR;
msousa@466: if ((NULL == datatype) && (NULL != symbol->datatype)) return;
msousa@459: if ((NULL == datatype) && (NULL == symbol->datatype)) return;
msousa@459:
msousa@459: if (search_in_candidate_datatype_list(datatype, symbol->candidate_datatypes) < 0)
msousa@693: symbol->datatype = &(get_datatype_info_c::invalid_type_name);
msousa@459: else {
msousa@459: if (NULL == symbol->datatype)
msousa@459: /* not yet set to anything, so we set it to the requested data type */
msousa@459: symbol->datatype = datatype;
msousa@459: else {
msousa@459: /* had already been set previously to some data type. Let's check if they are the same! */
msousa@676: if (!get_datatype_info_c::is_type_equal(symbol->datatype, datatype))
msousa@693: symbol->datatype = &(get_datatype_info_c::invalid_type_name);
msousa@459: // else
msousa@459: /* we leave it unchanged, as it is the same as the requested data type! */
msousa@459: }
msousa@459: }
msousa@425: }
msousa@425:
msousa@425:
msousa@425:
msousa@457: /* Only set the symbol's desired datatype to 'datatype' if that datatype is in the candidate_datatype list */
msousa@459: // static void set_datatype_in_prev_il_instructions(symbol_c *datatype, std::vector prev_il_instructions) {
msousa@459: static void set_datatype_in_prev_il_instructions(symbol_c *datatype, il_instruction_c *symbol) {
msousa@459: if (NULL == symbol) ERROR;
msousa@457: for (unsigned int i = 0; i < symbol->prev_il_instruction.size(); i++)
msousa@457: set_datatype(datatype, symbol->prev_il_instruction[i]);
msousa@457: }
msousa@457:
msousa@457:
msousa@425:
msousa@480: bool narrow_candidate_datatypes_c::is_widening_compatible(const struct widen_entry widen_table[], symbol_c *left_type, symbol_c *right_type, symbol_c *result_type, bool *deprecated_status) {
msousa@515: /* NOTE: According to our algorithm, left_type and right_type should never by NULL (if they are, we have an internal compiler error!
msousa@515: * However, result_type may be NULL if the code has a data type semantic error!
msousa@515: */
msousa@515: if ((NULL == left_type) || (NULL == right_type) || (NULL == result_type))
msousa@515: return false;
msousa@515:
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@478: && (typeid(*result_type) == typeid(*widen_table[k].result))) {
msousa@480: if (NULL != deprecated_status)
msousa@480: *deprecated_status = (widen_table[k].status == widen_entry::deprecated);
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@676: if (get_datatype_info_c::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@456: 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) {
mjsousa@834: set_datatype(called_fb_declaration, il_operand); /* only set it if it is in the candidate datatypes list! */
msousa@455: il_operand->accept(*this);
msousa@455: }
msousa@455:
msousa@459: if (0 == fake_prev_il_instruction->prev_il_instruction.size()) {
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@456: return NULL;
msousa@448: }
msousa@448:
mjsousa@834: symbol_c *fb_decl = (NULL == il_operand)? NULL : il_operand->datatype;
mjsousa@834:
msousa@455: if (NULL == fb_decl) {
mjsousa@834: /* the il_operand is a not FB instance, or it simply does not even exist, */
msousa@459: /* so we simply pass on the required datatype to the prev_il_instructions */
msousa@459: /* The invalid FB invocation will be caught in the print_datatypes_error_c by analysing NULL value in il_operand->datatype! */
msousa@459: set_datatype_in_prev_il_instructions(il_instruction->datatype, fake_prev_il_instruction);
msousa@456: return NULL;
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@459: symbol_c param_value = *fake_prev_il_instruction; /* copy the candidate_datatypes list ! */
msousa@461:
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: 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@459: * and we set it to invalid_type_name.
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@676: if ((NULL == il_instruction->datatype) || (get_datatype_info_c::is_type_equal(param_value.datatype, il_instruction->datatype))) {
msousa@459: set_datatype_in_prev_il_instructions(param_value.datatype, fake_prev_il_instruction);
msousa@455: } else {
msousa@693: set_datatype_in_prev_il_instructions(&get_datatype_info_c::invalid_type_name, fake_prev_il_instruction);
msousa@455: }
msousa@456: return NULL;
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@718: /* NOTE: symbol == NULL is valid. It will occur when, for e.g., an undefined/undeclared symbolic_variable is used in the code. */
msousa@423: if (symbol == NULL) return NULL;
msousa@718: return search_base_type_c::get_basetype_decl(symbol);
msousa@417: }
msousa@417:
msousa@726:
msousa@726:
msousa@417:
msousa@417: /**********************/
msousa@417: /* B 1.3 - Data types */
msousa@417: /**********************/
msousa@797: /***********************************/
msousa@797: /* B 1.3.1 - Elementary Data Types */
msousa@797: /***********************************/
msousa@797: /* NOTE: elementary datatypes are their own basetype ! */
msousa@797: void *narrow_candidate_datatypes_c::visit( time_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( bool_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( sint_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( int_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( dint_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( lint_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( usint_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( uint_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( udint_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( ulint_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( real_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( lreal_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( date_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( tod_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( dt_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( byte_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( word_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( dword_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( lword_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( string_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit( wstring_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797:
msousa@797: void *narrow_candidate_datatypes_c::visit(safetime_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safebool_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safesint_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safeint_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safedint_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safelint_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safeusint_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safeuint_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safeudint_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safeulint_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safereal_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safelreal_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safedate_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safetod_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safedt_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safebyte_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safeword_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safedword_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safelword_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safestring_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797: void *narrow_candidate_datatypes_c::visit(safewstring_type_name_c *symbol) {symbol->datatype = search_base_type_c::get_basetype_decl(symbol); return NULL;}
msousa@797:
msousa@797:
msousa@797: /********************************/
msousa@797: /* B.1.3.2 - Generic data types */
msousa@797: /********************************/
msousa@797: /* empty!! */
msousa@797:
msousa@417: /********************************/
msousa@417: /* B 1.3.3 - Derived data types */
msousa@417: /********************************/
msousa@806: void *narrow_candidate_datatypes_c::narrow_spec_init(symbol_c *symbol, symbol_c *type_decl, symbol_c *init_value) {
msousa@806: // If we are handling an anonymous datatype (i.e. a datatype implicitly declared inside a VAR ... END_VAR declaration)
msousa@806: // then the symbol->datatype has not yet been set by the previous visit(type_decl) method, because it does not exist!
msousa@806: // So we set the datatype ourselves!
msousa@806: if ((NULL == symbol->datatype) && (symbol->candidate_datatypes.size() == 1))
msousa@806: symbol->datatype = symbol->candidate_datatypes[0];
msousa@806:
msousa@806: set_datatype(symbol->datatype, type_decl);
msousa@806: type_decl->accept(*this);
msousa@806:
msousa@806: if (NULL != init_value) {
msousa@806: set_datatype(symbol->datatype, init_value);
msousa@806: init_value->accept(*this);
msousa@806: }
msousa@806: return NULL;
msousa@806: }
msousa@806:
msousa@806:
msousa@806: void *narrow_candidate_datatypes_c::narrow_type_decl(symbol_c *symbol, symbol_c *type_name, symbol_c *spec_init) {
msousa@806: if (symbol->candidate_datatypes.size() == 1) {
msousa@806: symbol->datatype = symbol->candidate_datatypes[0];
msousa@806:
msousa@806: set_datatype(symbol->datatype, type_name);
msousa@806: set_datatype(symbol->datatype, spec_init);
msousa@806: spec_init->accept(*this);
msousa@806: }
msousa@806: return NULL;
msousa@806: }
msousa@806:
msousa@806:
msousa@726: /* TYPE type_declaration_list END_TYPE */
msousa@726: // SYM_REF1(data_type_declaration_c, type_declaration_list)
msousa@726: /* NOTE: Not required. already handled by iterator_visitor_c base class */
msousa@726:
msousa@726: /* helper symbol for data_type_declaration */
msousa@726: // SYM_LIST(type_declaration_list_c)
msousa@726: /* NOTE: Not required. already handled by iterator_visitor_c base class */
msousa@726:
msousa@726: /* simple_type_name ':' simple_spec_init */
msousa@726: // SYM_REF2(simple_type_declaration_c, simple_type_name, simple_spec_init)
msousa@806: void *narrow_candidate_datatypes_c::visit(simple_type_declaration_c *symbol) {return narrow_type_decl(symbol, symbol->simple_type_name, symbol->simple_spec_init);}
msousa@726:
msousa@502: /* simple_specification ASSIGN constant */
msousa@502: // SYM_REF2(simple_spec_init_c, simple_specification, constant)
msousa@806: void *narrow_candidate_datatypes_c::visit(simple_spec_init_c *symbol) {return narrow_spec_init(symbol, symbol->simple_specification, symbol->constant);}
msousa@502:
msousa@726: /* subrange_type_name ':' subrange_spec_init */
msousa@726: // SYM_REF2(subrange_type_declaration_c, subrange_type_name, subrange_spec_init)
msousa@806: void *narrow_candidate_datatypes_c::visit(subrange_type_declaration_c *symbol) {return narrow_type_decl(symbol, symbol->subrange_type_name, symbol->subrange_spec_init);}
msousa@726:
msousa@726: /* subrange_specification ASSIGN signed_integer */
msousa@726: // SYM_REF2(subrange_spec_init_c, subrange_specification, signed_integer)
msousa@806: void *narrow_candidate_datatypes_c::visit(subrange_spec_init_c *symbol) {return narrow_spec_init(symbol, symbol->subrange_specification, symbol->signed_integer);}
msousa@726:
msousa@726: /* integer_type_name '(' subrange')' */
msousa@726: // SYM_REF2(subrange_specification_c, integer_type_name, subrange)
msousa@806: void *narrow_candidate_datatypes_c::visit(subrange_specification_c *symbol) {
msousa@806: set_datatype(symbol->datatype, symbol->integer_type_name);
msousa@806: symbol->integer_type_name->accept(*this);
msousa@806: set_datatype(symbol->datatype, symbol->integer_type_name);
msousa@806: symbol->integer_type_name->accept(*this);
msousa@806: return NULL;
msousa@806: }
msousa@502:
msousa@417: /* signed_integer DOTDOT signed_integer */
msousa@726: /* dimension will be filled in during stage 3 (array_range_check_c) with the number of elements in this subrange */
msousa@726: // SYM_REF2(subrange_c, lower_limit, upper_limit, unsigned long long int dimension;)
msousa@417: void *narrow_candidate_datatypes_c::visit(subrange_c *symbol) {
msousa@806: set_datatype(symbol->datatype, symbol->lower_limit);
msousa@417: symbol->lower_limit->accept(*this);
msousa@806: set_datatype(symbol->datatype, symbol->upper_limit);
msousa@417: symbol->upper_limit->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@726: /* enumerated_type_name ':' enumerated_spec_init */
msousa@726: // SYM_REF2(enumerated_type_declaration_c, enumerated_type_name, enumerated_spec_init)
msousa@806: void *narrow_candidate_datatypes_c::visit(enumerated_type_declaration_c *symbol) {return narrow_type_decl(symbol, symbol->enumerated_type_name, symbol->enumerated_spec_init);}
msousa@726:
msousa@726:
msousa@726: /* enumerated_specification ASSIGN enumerated_value */
msousa@726: // SYM_REF2(enumerated_spec_init_c, enumerated_specification, enumerated_value)
msousa@806: void *narrow_candidate_datatypes_c::visit(enumerated_spec_init_c *symbol) {return narrow_spec_init(symbol, symbol->enumerated_specification, symbol->enumerated_value);}
msousa@726:
msousa@726: /* helper symbol for enumerated_specification->enumerated_spec_init */
msousa@726: /* enumerated_value_list ',' enumerated_value */
msousa@726: // SYM_LIST(enumerated_value_list_c)
msousa@726: void *narrow_candidate_datatypes_c::visit(enumerated_value_list_c *symbol) {
msousa@806: //if (NULL == symbol->datatype) ERROR; // Comented out-> Reserve this check for the print_datatypes_error_c ???
msousa@806: for(int i = 0; i < symbol->n; i++) set_datatype(symbol->datatype, symbol->elements[i]);
msousa@806: //for(int i = 0; i < symbol->n; i++) if (NULL == symbol->elements[i]->datatype) ERROR; // Comented out-> Reserve this check for the print_datatypes_error_c ???
msousa@726: return NULL;
msousa@726: }
msousa@726:
msousa@726:
msousa@726: /* enumerated_type_name '#' identifier */
msousa@726: // SYM_REF2(enumerated_value_c, type, value)
msousa@726: // void *narrow_candidate_datatypes_c::visit(enumerated_value_c *symbol) {/* do nothing! */ return NULL;}
msousa@726:
msousa@726:
msousa@726: /* identifier ':' array_spec_init */
msousa@726: // SYM_REF2(array_type_declaration_c, identifier, array_spec_init)
msousa@806: void *narrow_candidate_datatypes_c::visit(array_type_declaration_c *symbol) {return narrow_type_decl(symbol, symbol->identifier, symbol->array_spec_init);}
msousa@726:
msousa@726: /* array_specification [ASSIGN array_initialization} */
msousa@726: /* array_initialization may be NULL ! */
msousa@726: // SYM_REF2(array_spec_init_c, array_specification, array_initialization)
msousa@806: void *narrow_candidate_datatypes_c::visit(array_spec_init_c *symbol) {return narrow_spec_init(symbol, symbol->array_specification, symbol->array_initialization);}
msousa@726:
msousa@726: /* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
msousa@726: // SYM_REF2(array_specification_c, array_subrange_list, non_generic_type_name)
msousa@806: // Not needed!!
msousa@726:
msousa@726: /* helper symbol for array_specification */
msousa@726: /* array_subrange_list ',' subrange */
msousa@726: // SYM_LIST(array_subrange_list_c)
msousa@806: // Not needed ??
msousa@726:
msousa@726: /* array_initialization: '[' array_initial_elements_list ']' */
msousa@726: /* helper symbol for array_initialization */
msousa@726: /* array_initial_elements_list ',' array_initial_elements */
msousa@726: // SYM_LIST(array_initial_elements_list_c)
msousa@806: // Not needed ???
msousa@726:
msousa@726: /* integer '(' [array_initial_element] ')' */
msousa@726: /* array_initial_element may be NULL ! */
msousa@726: // SYM_REF2(array_initial_elements_c, integer, array_initial_element)
msousa@806: // Not needed ???
msousa@726:
msousa@726: /* structure_type_name ':' structure_specification */
msousa@726: // SYM_REF2(structure_type_declaration_c, structure_type_name, structure_specification)
msousa@806: void *narrow_candidate_datatypes_c::visit(structure_type_declaration_c *symbol) {return narrow_type_decl(symbol, symbol->structure_type_name, symbol->structure_specification);}
msousa@726:
msousa@726: /* structure_type_name ASSIGN structure_initialization */
msousa@726: /* structure_initialization may be NULL ! */
msousa@726: // SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization)
msousa@806: void *narrow_candidate_datatypes_c::visit(initialized_structure_c *symbol) {return narrow_spec_init(symbol, symbol->structure_type_name, symbol->structure_initialization);}
msousa@726:
msousa@726: /* helper symbol for structure_declaration */
msousa@726: /* structure_declaration: STRUCT structure_element_declaration_list END_STRUCT */
msousa@726: /* structure_element_declaration_list structure_element_declaration ';' */
msousa@726: // SYM_LIST(structure_element_declaration_list_c)
msousa@806: // Not needed ???
msousa@726:
msousa@726: /* structure_element_name ':' *_spec_init */
msousa@726: // SYM_REF2(structure_element_declaration_c, structure_element_name, spec_init)
msousa@806: // Not needed ???
msousa@726:
msousa@726: /* helper symbol for structure_initialization */
msousa@726: /* structure_initialization: '(' structure_element_initialization_list ')' */
msousa@726: /* structure_element_initialization_list ',' structure_element_initialization */
msousa@726: // SYM_LIST(structure_element_initialization_list_c)
msousa@806: // Not needed ???
msousa@726:
msousa@726: /* structure_element_name ASSIGN value */
msousa@726: // SYM_REF2(structure_element_initialization_c, structure_element_name, value)
msousa@806: // Not needed ???
msousa@726:
msousa@726: /* string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */
msousa@726: // SYM_REF4(string_type_declaration_c, string_type_name, elementary_string_type_name, string_type_declaration_size, string_type_declaration_init/* may be == NULL! */)
msousa@726:
msousa@726:
msousa@810: /* structure_type_name ASSIGN structure_initialization */
msousa@810: /* structure_initialization may be NULL ! */
msousa@810: // SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization)
msousa@810: void *narrow_candidate_datatypes_c::visit(fb_spec_init_c *symbol) {return narrow_spec_init(symbol, symbol->function_block_type_name, symbol->structure_initialization);}
msousa@726:
msousa@726:
mjsousa@909: /* REF_TO (non_generic_type_name | function_block_type_name) */
mjsousa@909: // SYM_REF1(ref_spec_c, type_name)
mjsousa@909: void *narrow_candidate_datatypes_c::visit(ref_spec_c *symbol) {
mjsousa@909: /* First handle the datatype being referenced (pointed to) */
mjsousa@909: if (symbol->type_name->candidate_datatypes.size() == 1) {
mjsousa@909: symbol->type_name->datatype = symbol->type_name->candidate_datatypes[0];
mjsousa@909: symbol->type_name->accept(*this);
mjsousa@909: }
mjsousa@909:
mjsousa@909: /* Now handle the reference datatype itself (i.e. the pointer) */
mjsousa@909: // If we are handling an anonymous datatype (i.e. a datatype implicitly declared inside a VAR ... END_VAR declaration)
mjsousa@909: // then the symbol->datatype has not yet been set by the previous visit(type_decl) method, because it does not exist!
mjsousa@909: // So we set the datatype ourselves!
mjsousa@909: if ((NULL == symbol->datatype) && (symbol->candidate_datatypes.size() == 1))
mjsousa@909: symbol->datatype = symbol->candidate_datatypes[0];
mjsousa@909:
mjsousa@909: return NULL;
mjsousa@909: }
mjsousa@909:
mjsousa@909: /* For the moment, we do not support initialising reference data types */
mjsousa@909: /* ref_spec [ ASSIGN ref_initialization ] */
mjsousa@909: /* NOTE: ref_initialization may be NULL!! */
mjsousa@909: // SYM_REF2(ref_spec_init_c, ref_spec, ref_initialization)
mjsousa@909: void *narrow_candidate_datatypes_c::visit(ref_spec_init_c *symbol) {return narrow_spec_init(symbol, symbol->ref_spec, symbol->ref_initialization);}
mjsousa@909:
mjsousa@909: /* identifier ':' ref_spec_init */
mjsousa@909: // SYM_REF2(ref_type_decl_c, ref_type_name, ref_spec_init)
mjsousa@909: void *narrow_candidate_datatypes_c::visit(ref_type_decl_c *symbol) {return narrow_type_decl(symbol, symbol->ref_type_name, symbol->ref_spec_init);}
mjsousa@909:
mjsousa@909:
mjsousa@909:
msousa@417: /*********************/
msousa@417: /* B 1.4 - Variables */
msousa@417: /*********************/
mjsousa@843: // SYM_REF1(symbolic_variable_c, var_name)
mjsousa@843: void *narrow_candidate_datatypes_c::visit(symbolic_variable_c *symbol) {
mjsousa@889: symbol->scope = current_scope; // the scope in which this variable was declared!
mjsousa@843: symbol->var_name->datatype = symbol->datatype;
mjsousa@843: return NULL;
mjsousa@843: }
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);
mjsousa@827:
mjsousa@827: /* Set the datatype of the subscripted variable and visit it recursively. For the reason why we do this, */
mjsousa@827: /* Please read the comments in the array_variable_c and structured_variable_c visitors in the fill_candidate_datatypes.cc file! */
mjsousa@827: symbol->subscripted_variable->accept(*this); // visit recursively
mjsousa@827:
mjsousa@827: if (symbol->subscripted_variable->candidate_datatypes.size() == 1)
mjsousa@827: symbol->subscripted_variable->datatype = symbol->subscripted_variable->candidate_datatypes[0]; // set the datatype
mjsousa@827:
mjsousa@889: // the scope in which this variable was declared! It will be the same as the subscripted variable (a symbolic_variable_ !)
mjsousa@889: symbol->scope = symbol->subscripted_variable->scope;
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@666: if (get_datatype_info_c::is_ANY_INT(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:
mjsousa@827: /* record_variable '.' field_selector */
mjsousa@827: /* WARNING: input and/or output variables of function blocks
mjsousa@827: * may be accessed as fields of a structured variable!
mjsousa@827: * Code handling a structured_variable_c must take
mjsousa@827: * this into account!
mjsousa@827: */
mjsousa@827: // SYM_REF2(structured_variable_c, record_variable, field_selector)
mjsousa@827: void *narrow_candidate_datatypes_c::visit(structured_variable_c *symbol) {
mjsousa@827: /* Set the datatype of the record_variable and visit it recursively. For the reason why we do this, */
mjsousa@827: /* Please read the comments in the array_variable_c and structured_variable_c visitors in the fill_candidate_datatypes.cc file! */
mjsousa@827: symbol->record_variable->accept(*this); // visit recursively
mjsousa@827:
mjsousa@827: if (symbol->record_variable->candidate_datatypes.size() == 1)
mjsousa@827: symbol->record_variable->datatype = symbol->record_variable->candidate_datatypes[0]; // set the datatype
mjsousa@827:
mjsousa@889: symbol->scope = symbol->record_variable->datatype; // the scope in which this variable was declared!
mjsousa@827: return NULL;
mjsousa@827: }
mjsousa@827:
msousa@502:
msousa@502: /******************************************/
msousa@502: /* B 1.4.3 - Declaration & Initialisation */
msousa@502: /******************************************/
msousa@502:
msousa@502: void *narrow_candidate_datatypes_c::visit(var1_list_c *symbol) {
msousa@502: #if 0 /* We don't really need to set the datatype of each variable. We just check the declaration itself! */
msousa@502: for(int i = 0; i < symbol->n; i++) {
msousa@502: if (symbol->elements[i]->candidate_datatypes.size() == 1)
msousa@502: symbol->elements[i]->datatype = symbol->elements[i]->candidate_datatypes[0];
msousa@502: }
msousa@502: #endif
msousa@502: return NULL;
msousa@502: }
msousa@502:
msousa@502:
msousa@502: /* AT direct_variable */
msousa@502: // SYM_REF1(location_c, direct_variable)
msousa@502: void *narrow_candidate_datatypes_c::visit(location_c *symbol) {
msousa@502: set_datatype(symbol->datatype, symbol->direct_variable);
msousa@502: symbol->direct_variable->accept(*this); /* currently does nothing! */
msousa@502: return NULL;
msousa@502: }
msousa@502:
msousa@502:
msousa@502: /* [variable_name] location ':' located_var_spec_init */
msousa@502: /* variable_name -> may be NULL ! */
msousa@502: // SYM_REF3(located_var_decl_c, variable_name, location, located_var_spec_init)
msousa@502: void *narrow_candidate_datatypes_c::visit(located_var_decl_c *symbol) {
msousa@502: /* let the var_spec_init set its own symbol->datatype value */
msousa@502: symbol->located_var_spec_init->accept(*this);
msousa@502:
msousa@502: if (NULL != symbol->variable_name)
msousa@502: set_datatype(symbol->located_var_spec_init->datatype, symbol->variable_name);
msousa@502:
msousa@502: set_datatype(symbol->located_var_spec_init->datatype, symbol->location);
msousa@502: symbol->location->accept(*this);
msousa@502: return NULL;
msousa@502: }
msousa@502:
msousa@502:
msousa@808:
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@798: /* set the function_declaration_c->datatype to the datatype returned by the function! */
msousa@798: symbol->type_name->datatype = search_base_type_c::get_basetype_decl(symbol->type_name);
msousa@798: symbol->datatype = symbol->type_name->datatype;
msousa@798:
mjsousa@889: current_scope = 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;
mjsousa@889: current_scope = 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) {
mjsousa@889: current_scope = 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;
mjsousa@889: current_scope = NULL;
mjsousa@889:
msousa@807: // A FB declaration can also be used as a Datatype! We now do the narrow algorithm considering it as such!
msousa@807: if (symbol->candidate_datatypes.size() == 1)
msousa@807: symbol->datatype = symbol->candidate_datatypes[0];
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) {
mjsousa@889: current_scope = 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;
mjsousa@889: current_scope = NULL;
msousa@417: return NULL;
msousa@417: }
msousa@417:
Laurent@802: /********************************************/
Laurent@802: /* B 1.6 Sequential function chart elements */
Laurent@802: /********************************************/
Laurent@802: void *narrow_candidate_datatypes_c::visit(transition_condition_c *symbol) {
mjsousa@895: // We can safely ask for a BOOL type, as even if the result is a SAFEBOOL, in that case it will aslo include BOOL as a possible datatype.
mjsousa@895: set_datatype(&get_datatype_info_c::bool_type_name /* datatype*/, symbol /* symbol */);
mjsousa@895:
Laurent@802: if (symbol->transition_condition_il != NULL) {
mjsousa@895: set_datatype(symbol->datatype, symbol->transition_condition_il);
Laurent@802: symbol->transition_condition_il->accept(*this);
Laurent@802: }
Laurent@802: if (symbol->transition_condition_st != NULL) {
mjsousa@895: set_datatype(symbol->datatype, symbol->transition_condition_st);
Laurent@802: symbol->transition_condition_st->accept(*this);
Laurent@802: }
Laurent@802: return NULL;
Laurent@802: }
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@466: /* In order to execute the narrow algoritm correctly
msousa@466: * in IL instruction lists containing JMPs to labels that come before the JMP instruction
msousa@466: * itself, we need to run the narrow algorithm twice on the Instruction List.
msousa@466: * e.g.: ...
msousa@466: * ld 23
msousa@466: * label1:st byte_var
msousa@466: * ld 34
msousa@466: * JMP label1
msousa@466: *
msousa@466: * Note that the second time we run the narrow, most of the datatypes are already filled
msousa@466: * in, so it will be able to produce tha correct datatypes for the IL instruction referenced
msousa@466: * by the label, as in the 2nd pass we already know the datatypes of the JMP instruction!
msousa@466: */
msousa@466: for(int j = 0; j < 2; j++) {
msousa@466: for(int i = symbol->n-1; i >= 0; i--) {
msousa@466: symbol->elements[i]->accept(*this);
msousa@466: }
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@459: set_datatype_in_prev_il_instructions(symbol->datatype, symbol);
msousa@448: } else {
msousa@459: il_instruction_c tmp_prev_il_instruction(NULL, NULL);
msousa@459: /* the narrow algorithm will need access to the intersected candidate_datatype lists of all prev_il_instructions, as well as the
msousa@459: * list of the prev_il_instructions.
msousa@459: * Instead of creating two 'global' (within the class) variables, we create a single il_instruction_c variable (fake_prev_il_instruction),
msousa@459: * and shove that data into this single variable.
msousa@459: */
msousa@459: tmp_prev_il_instruction.prev_il_instruction = symbol->prev_il_instruction;
msousa@459: intersect_prev_candidate_datatype_lists(&tmp_prev_il_instruction);
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@459: fake_prev_il_instruction = &tmp_prev_il_instruction;
msousa@674: current_il_instruction = symbol;
msousa@459: symbol->il_instruction->datatype = symbol->datatype;
msousa@448: symbol->il_instruction->accept(*this);
msousa@459: fake_prev_il_instruction = NULL;
msousa@674: current_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@534: * This change will also be undone at the end of this method.
msousa@451: */
msousa@459: symbol_c param_value = *fake_prev_il_instruction; /* copy the candidate_datatypes list */
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: ((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@459: set_datatype_in_prev_il_instructions(param_value.datatype, fake_prev_il_instruction);
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@459: il_instruction_c *save_fake_prev_il_instruction = fake_prev_il_instruction; /*this is not really necessary, but lets play it safe */
msousa@452: symbol->simple_instr_list->accept(*this);
msousa@459: fake_prev_il_instruction = save_fake_prev_il_instruction;
msousa@690:
msousa@690: /* Since stage2 will insert an artificial (and equivalent) LD to the simple_instr_list when an 'il_operand' exists, we know
msousa@690: * that if (symbol->il_operand != NULL), then the first IL instruction in the simple_instr_list will be the equivalent and artificial
msousa@690: * 'LD ' IL instruction.
msousa@690: * Just to be consistent, we will copy the datatype info back into the il_operand, even though this should not be necessary!
msousa@690: */
msousa@690: if ((NULL != symbol->il_operand) && ((NULL == symbol->simple_instr_list) || (0 == ((list_c *)symbol->simple_instr_list)->n))) ERROR; // stage2 is not behaving as we expect it to!
msousa@690: if (NULL != symbol->il_operand)
msousa@690: symbol->il_operand->datatype = ((list_c *)symbol->simple_instr_list)->elements[0]->datatype;
msousa@690:
msousa@459: return NULL;
msousa@417: }
msousa@417:
msousa@456:
msousa@466:
msousa@466:
msousa@466: /* il_jump_operator label */
msousa@466: void *narrow_candidate_datatypes_c::visit(il_jump_operation_c *symbol) {
msousa@466: /* recursive call to fill the datatype */
msousa@466: symbol->il_jump_operator->datatype = symbol->datatype;
msousa@466: symbol->il_jump_operator->accept(*this);
msousa@466: return NULL;
msousa@466: }
msousa@466:
msousa@466:
msousa@466:
msousa@466:
msousa@466:
msousa@466:
msousa@466:
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: */
mjsousa@834: /* NOTE: The parameter 'called_fb_declaration'is used to pass data between stage 3 and stage4 */
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@459: if (symbol->prev_il_instruction.size() > 1) ERROR; /* There should be no labeled insructions inside an IL expression! */
msousa@459:
msousa@459: il_instruction_c tmp_prev_il_instruction(NULL, NULL);
msousa@459: /* the narrow algorithm will need access to the intersected candidate_datatype lists of all prev_il_instructions, as well as the
msousa@459: * list of the prev_il_instructions.
msousa@459: * Instead of creating two 'global' (within the class) variables, we create a single il_instruction_c variable (fake_prev_il_instruction),
msousa@459: * and shove that data into this single variable.
msousa@459: */
msousa@459: if (symbol->prev_il_instruction.size() > 0)
msousa@459: tmp_prev_il_instruction.candidate_datatypes = symbol->prev_il_instruction[0]->candidate_datatypes;
msousa@459: tmp_prev_il_instruction.prev_il_instruction = symbol->prev_il_instruction;
msousa@459:
msousa@459: /* copy the candidate_datatypes list */
msousa@459: fake_prev_il_instruction = &tmp_prev_il_instruction;
msousa@453: symbol->il_simple_instruction->datatype = symbol->datatype;
msousa@453: symbol->il_simple_instruction->accept(*this);
msousa@459: fake_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: /*******************/
mjsousa@836: /* Sets the datatype of the il_operand, and calls it recursively!
mjsousa@836: *
mjsousa@836: * NOTE 1: the il_operand __may__ be pointing to a parenthesized list of IL instructions.
mjsousa@836: * e.g. LD 33
mjsousa@836: * AND ( 45
mjsousa@836: * OR 56
mjsousa@836: * )
mjsousa@836: * When we handle the first 'AND' IL_operator, the il_operand will point to an simple_instr_list_c.
mjsousa@836: * In this case, when we call il_operand->accept(*this);, the prev_il_instruction pointer will be overwritten!
mjsousa@836: *
mjsousa@836: * So, if yoy wish to set the prev_il_instruction->datatype = symbol->datatype;
mjsousa@836: * do it __before__ calling set_il_operand_datatype() (which in turn calls il_operand->accept(*this)) !!
mjsousa@836: */
mjsousa@836: void *narrow_candidate_datatypes_c::set_il_operand_datatype(symbol_c *il_operand, symbol_c *datatype) {
mjsousa@836: if (NULL == il_operand) return NULL; /* if no IL operand => error in the source code!! */
mjsousa@836:
mjsousa@836: /* If il_operand already has a non-NULL datatype (remember, narrow algorithm runs twice over IL lists!),
mjsousa@836: * but narrow algorithm has not yet been able to determine what datatype it should take? This is strange,
mjsousa@836: * and most probably an error!
mjsousa@836: */
mjsousa@838: if ((NULL != il_operand->datatype) && (NULL == datatype)) ERROR;
mjsousa@836:
mjsousa@836: /* If the il_operand's datatype has already been set previously, and
mjsousa@836: * the narrow algorithm has already determined the datatype the il_operand should take!
mjsousa@836: * ...we just make sure that the new datatype is the same as the current il_operand's datatype
mjsousa@836: */
mjsousa@836: if ((NULL != il_operand->datatype) && (NULL != datatype)) {
mjsousa@838: /* Both datatypes are an invalid_type_name_c. This implies they are the same!! */
mjsousa@838: if ((!get_datatype_info_c::is_type_valid(datatype)) && ((!get_datatype_info_c::is_type_valid(il_operand->datatype))))
mjsousa@838: return NULL;;
mjsousa@836: /* OK, so both the datatypes are valid, but are they equal? */
mjsousa@838: if ( !get_datatype_info_c::is_type_equal(il_operand->datatype, datatype))
mjsousa@838: ERROR;
mjsousa@836: /* The datatypes are the same. We have nothing to do, so we simply return! */
mjsousa@836: return NULL;
mjsousa@836: }
mjsousa@836:
mjsousa@836: /* Set the il_operand's datatype. Note that the new 'datatype' may even be NULL!!! */
mjsousa@836: il_operand->datatype = datatype;
mjsousa@836: /* Even if we are not able to determine the il_operand's datatype ('datatype' is NULL), we still visit it recursively,
mjsousa@836: * to give a chance of any complex expressions embedded in the il_operand (e.g. expressions inside array subscripts!)
mjsousa@836: * to be narrowed too.
mjsousa@836: */
mjsousa@836: il_operand->accept(*this);
mjsousa@836: return NULL;
mjsousa@836: }
mjsousa@836:
mjsousa@836:
mjsousa@836:
mjsousa@836:
msousa@480: void *narrow_candidate_datatypes_c::narrow_binary_operator(const struct widen_entry widen_table[], symbol_c *symbol, bool *deprecated_operation) {
msousa@478: symbol_c *prev_instruction_type, *operand_type;
msousa@478: int count = 0;
msousa@478:
msousa@480: if (NULL != deprecated_operation)
msousa@480: *deprecated_operation = false;
msousa@480:
mjsousa@834: if (NULL == il_operand) return NULL; /* if no IL operand => error in the source code!! */
mjsousa@834:
mjsousa@834: /* NOTE 1: the il_operand __may__ be pointing to a parenthesized list of IL instructions.
msousa@478: * e.g. LD 33
msousa@478: * AND ( 45
msousa@478: * OR 56
msousa@478: * )
msousa@478: * When we handle the first 'AND' IL_operator, the il_operand will point to an simple_instr_list_c.
msousa@478: * In this case, when we call il_operand->accept(*this);, the prev_il_instruction pointer will be overwritten!
msousa@478: *
msousa@478: * We must therefore set the prev_il_instruction->datatype = symbol->datatype;
msousa@478: * __before__ calling il_operand->accept(*this) !!
msousa@478: *
msousa@478: * NOTE 2: We do not need to call prev_il_instruction->accept(*this), as the object to which prev_il_instruction
msousa@478: * is pointing to will be later narrowed by the call from the for() loop of the instruction_list_c
msousa@478: * (or simple_instr_list_c), which iterates backwards.
msousa@478: */
mjsousa@836: if (NULL != symbol->datatype) { // next IL instructions were able to determine the datatype this instruction should produce
mjsousa@836: for(unsigned int i = 0; i < fake_prev_il_instruction->candidate_datatypes.size(); i++) {
mjsousa@836: for(unsigned int j = 0; j < il_operand->candidate_datatypes.size(); j++) {
mjsousa@836: prev_instruction_type = fake_prev_il_instruction->candidate_datatypes[i];
mjsousa@836: operand_type = il_operand->candidate_datatypes[j];
mjsousa@836: if (is_widening_compatible(widen_table, prev_instruction_type, operand_type, symbol->datatype, deprecated_operation)) {
mjsousa@836: /* set the desired datatype of the previous il instruction */
mjsousa@836: set_datatype_in_prev_il_instructions(prev_instruction_type, fake_prev_il_instruction);
mjsousa@836: /* set the datatype for the operand */
mjsousa@836: set_il_operand_datatype(il_operand, operand_type);
mjsousa@836:
mjsousa@836: /* NOTE: DO NOT search any further! Return immediately!
mjsousa@836: * Since we support SAFE*** datatypes, multiple entries in the widen_table may be compatible.
mjsousa@836: * If we try to set more than one distinct datatype on the same symbol, then the datatype will be set to
mjsousa@836: * an invalid_datatype, which is NOT what we want!
mjsousa@836: */
mjsousa@836: return NULL;
mjsousa@836: }
msousa@478: }
msousa@478: }
msousa@478: }
mjsousa@836: /* We were not able to determine the required datatype, but we still give the il_operand a chance to be narrowed! */
mjsousa@836: set_il_operand_datatype(il_operand, NULL);
msousa@478: return NULL;
msousa@478: }
msousa@478:
msousa@478:
msousa@443:
msousa@480:
mjsousa@838: /* Narrow IL operators whose execution is conditional on the boolean value in the accumulator.
mjsousa@838: * Basically, narrow the JMPC, JMPCN, RETC, RETCN, CALC, and CALCN operators!
mjsousa@838: * Also does part of the S and R operator narrowing!!!
mjsousa@838: */
mjsousa@838: void *narrow_candidate_datatypes_c::narrow_conditional_operator(symbol_c *symbol) {
mjsousa@838: /* if the next IL instructions needs us to provide a datatype other than a BOOL or a SAFEBOOL,
mjsousa@838: * then we have an internal compiler error - most likely in fill_candidate_datatypes_c
mjsousa@838: */
mjsousa@838: // I (mario) am confident the fill/narrow algorithms are working correctly, so for now we can disable the assertions!
mjsousa@838: //if ((NULL != symbol->datatype) && (!get_datatype_info_c::is_BOOL_compatible(symbol->datatype))) ERROR;
mjsousa@838: //if (symbol->candidate_datatypes.size() > 2) ERROR; /* may contain, at most, a BOOL and a SAFEBOOL */
mjsousa@838:
mjsousa@838: /* NOTE: If there is no IL instruction following this S, R, CALC, CALCN, JMPC, JMPCN, RETC, or RETCN instruction,
mjsousa@838: * we must still provide a bool_type_name_c datatype (if possible, i.e. if it exists in the candidate datatype list).
mjsousa@838: * If it is not possible, we set it to NULL
mjsousa@838: *
mjsousa@838: * NOTE: Note that this algorithm we are implementing is slightly wrong.
mjsousa@838: * (a) It ignores that a SAFEBOOL may be needed instead of a BOOL datatype.
mjsousa@838: * (b) It also ignores that this method gets to be called twice on the same
mjsousa@838: * object (the narrow algorithm runs through the IL list twice in order to
mjsousa@838: * handle forward JMPs), so the assumption that we must immediately set our
mjsousa@838: * own datatype if we get called with a NULL symbol->datatype is incorrect
mjsousa@838: * (it may be that the second time it is called it will be with the correct datatype!).
mjsousa@838: *
mjsousa@838: * These two issues (a) and (b) together means that we should only really be setting our own
mjsousa@838: * datatype if we are certain that the following IL instructions will never set it for us
mjsousa@838: * - basically if the following IL instruction is a LD, or a JMP to a LD, or a JMP to a JMP to a LD,
mjsousa@838: * etc..., or a conditional JMP whose both branches go to LD, etc...!!!
mjsousa@838: *
mjsousa@838: * At the moment, it seems to me that we would need to write a visitor class to do this for us!
mjsousa@838: * I currently have other things on my mind at the moment, so I will leave this for later...
mjsousa@838: * For the moment we just set it to BOOL, and ignore the support of SAFEBOOL!
mjsousa@838: */
mjsousa@838: if (NULL == symbol->datatype) set_datatype(&get_datatype_info_c::bool_type_name /* datatype*/, symbol /* symbol */);
mjsousa@838: if (NULL == symbol->datatype) ERROR; // the BOOL is not on the candidate_datatypes! Strange... Probably a bug in fill_candidate_datatype_c
mjsousa@838:
mjsousa@838: /* set the required datatype of the previous IL instruction, i.e. a bool_type_name_c! */
mjsousa@838: set_datatype_in_prev_il_instructions(symbol->datatype, fake_prev_il_instruction);
mjsousa@838: return NULL;
mjsousa@838: }
mjsousa@838:
mjsousa@838:
mjsousa@838:
mjsousa@838: void *narrow_candidate_datatypes_c::narrow_S_and_R_operator(symbol_c *symbol, const char *param_name, symbol_c *called_fb_declaration) {
mjsousa@838: if (NULL != called_fb_declaration)
mjsousa@838: /* FB call semantics */
mjsousa@838: return narrow_implicit_il_fb_call(symbol, param_name, called_fb_declaration);
mjsousa@838:
mjsousa@838: /* Set/Reset semantics */
mjsousa@838: narrow_conditional_operator(symbol);
mjsousa@838: /* set the datatype for the il_operand */
mjsousa@838: if ((NULL != il_operand) && (il_operand->candidate_datatypes.size() > 0))
mjsousa@838: set_il_operand_datatype(il_operand, il_operand->candidate_datatypes[0]);
mjsousa@836: return NULL;
mjsousa@836: }
mjsousa@836:
mjsousa@836:
mjsousa@836:
mjsousa@839: void *narrow_candidate_datatypes_c::narrow_store_operator(symbol_c *symbol) {
mjsousa@836: if (symbol->candidate_datatypes.size() == 1) {
mjsousa@836: symbol->datatype = symbol->candidate_datatypes[0];
mjsousa@836: /* set the desired datatype of the previous il instruction */
mjsousa@836: set_datatype_in_prev_il_instructions(symbol->datatype, fake_prev_il_instruction);
mjsousa@836: /* In the case of the ST operator, we must set the datatype of the il_instruction_c object that points to this ST_operator_c ourselves,
mjsousa@836: * since the following il_instruction_c objects have not done it, as is normal/standard for other instructions!
mjsousa@836: */
mjsousa@836: current_il_instruction->datatype = symbol->datatype;
mjsousa@836: }
mjsousa@834:
mjsousa@834: /* set the datatype for the operand */
mjsousa@836: set_il_operand_datatype(il_operand, symbol->datatype);
msousa@417: return NULL;
msousa@417: }
msousa@417:
mjsousa@839:
mjsousa@839:
mjsousa@839: void *narrow_candidate_datatypes_c::visit( LD_operator_c *symbol) {return set_il_operand_datatype(il_operand, symbol->datatype);}
mjsousa@839: void *narrow_candidate_datatypes_c::visit( LDN_operator_c *symbol) {return set_il_operand_datatype(il_operand, symbol->datatype);}
mjsousa@839:
mjsousa@839: void *narrow_candidate_datatypes_c::visit( ST_operator_c *symbol) {return narrow_store_operator(symbol);}
mjsousa@839: void *narrow_candidate_datatypes_c::visit( STN_operator_c *symbol) {return narrow_store_operator(symbol);}
mjsousa@838:
mjsousa@838:
mjsousa@838: /* NOTE: the standard allows syntax in which the NOT operator is followed by an optional
mjsousa@838: * NOT []
mjsousa@838: * However, it does not define the semantic of the NOT operation when the is specified.
mjsousa@838: * We therefore consider it an error if an il_operand is specified!
mjsousa@838: * This error will be detected in print_datatypes_error_c!!
mjsousa@838: */
mjsousa@838: /* This operator does not change the data type, it simply inverts the bits in the ANT_BIT data types! */
mjsousa@838: /* So, we merely set the desired datatype of the previous il instruction */
mjsousa@838: void *narrow_candidate_datatypes_c::visit( NOT_operator_c *symbol) {set_datatype_in_prev_il_instructions(symbol->datatype, fake_prev_il_instruction);return NULL;}
mjsousa@838:
mjsousa@838: void *narrow_candidate_datatypes_c::visit( S_operator_c *symbol) {return narrow_S_and_R_operator (symbol, "S", symbol->called_fb_declaration);}
mjsousa@838: void *narrow_candidate_datatypes_c::visit( R_operator_c *symbol) {return narrow_S_and_R_operator (symbol, "R", symbol->called_fb_declaration);}
msousa@448:
msousa@456: void *narrow_candidate_datatypes_c::visit( S1_operator_c *symbol) {return narrow_implicit_il_fb_call(symbol, "S1", symbol->called_fb_declaration);}
msousa@456: void *narrow_candidate_datatypes_c::visit( R1_operator_c *symbol) {return narrow_implicit_il_fb_call(symbol, "R1", symbol->called_fb_declaration);}
msousa@456: void *narrow_candidate_datatypes_c::visit( CLK_operator_c *symbol) {return narrow_implicit_il_fb_call(symbol, "CLK", symbol->called_fb_declaration);}
msousa@456: void *narrow_candidate_datatypes_c::visit( CU_operator_c *symbol) {return narrow_implicit_il_fb_call(symbol, "CU", symbol->called_fb_declaration);}
msousa@456: void *narrow_candidate_datatypes_c::visit( CD_operator_c *symbol) {return narrow_implicit_il_fb_call(symbol, "CD", symbol->called_fb_declaration);}
msousa@456: void *narrow_candidate_datatypes_c::visit( PV_operator_c *symbol) {return narrow_implicit_il_fb_call(symbol, "PV", symbol->called_fb_declaration);}
msousa@456: void *narrow_candidate_datatypes_c::visit( IN_operator_c *symbol) {return narrow_implicit_il_fb_call(symbol, "IN", symbol->called_fb_declaration);}
msousa@456: void *narrow_candidate_datatypes_c::visit( PT_operator_c *symbol) {return narrow_implicit_il_fb_call(symbol, "PT", symbol->called_fb_declaration);}
msousa@456:
msousa@481: void *narrow_candidate_datatypes_c::visit( AND_operator_c *symbol) {return narrow_binary_operator(widen_AND_table, symbol);}
msousa@481: void *narrow_candidate_datatypes_c::visit( OR_operator_c *symbol) {return narrow_binary_operator( widen_OR_table, symbol);}
msousa@481: void *narrow_candidate_datatypes_c::visit( XOR_operator_c *symbol) {return narrow_binary_operator(widen_XOR_table, symbol);}
msousa@483: void *narrow_candidate_datatypes_c::visit(ANDN_operator_c *symbol) {return narrow_binary_operator(widen_AND_table, symbol);}
msousa@483: void *narrow_candidate_datatypes_c::visit( ORN_operator_c *symbol) {return narrow_binary_operator( widen_OR_table, symbol);}
msousa@483: void *narrow_candidate_datatypes_c::visit(XORN_operator_c *symbol) {return narrow_binary_operator(widen_XOR_table, symbol);}
msousa@480: void *narrow_candidate_datatypes_c::visit( ADD_operator_c *symbol) {return narrow_binary_operator(widen_ADD_table, symbol, &(symbol->deprecated_operation));}
msousa@480: void *narrow_candidate_datatypes_c::visit( SUB_operator_c *symbol) {return narrow_binary_operator(widen_SUB_table, symbol, &(symbol->deprecated_operation));}
msousa@480: void *narrow_candidate_datatypes_c::visit( MUL_operator_c *symbol) {return narrow_binary_operator(widen_MUL_table, symbol, &(symbol->deprecated_operation));}
msousa@480: void *narrow_candidate_datatypes_c::visit( DIV_operator_c *symbol) {return narrow_binary_operator(widen_DIV_table, symbol, &(symbol->deprecated_operation));}
msousa@480: void *narrow_candidate_datatypes_c::visit( MOD_operator_c *symbol) {return narrow_binary_operator(widen_MOD_table, symbol);}
msousa@484: void *narrow_candidate_datatypes_c::visit( GT_operator_c *symbol) {return narrow_binary_operator(widen_CMP_table, symbol);}
msousa@484: void *narrow_candidate_datatypes_c::visit( GE_operator_c *symbol) {return narrow_binary_operator(widen_CMP_table, symbol);}
msousa@484: void *narrow_candidate_datatypes_c::visit( EQ_operator_c *symbol) {return narrow_binary_operator(widen_CMP_table, symbol);}
msousa@484: void *narrow_candidate_datatypes_c::visit( LT_operator_c *symbol) {return narrow_binary_operator(widen_CMP_table, symbol);}
msousa@484: void *narrow_candidate_datatypes_c::visit( LE_operator_c *symbol) {return narrow_binary_operator(widen_CMP_table, symbol);}
msousa@484: void *narrow_candidate_datatypes_c::visit( NE_operator_c *symbol) {return narrow_binary_operator(widen_CMP_table, symbol);}
msousa@448:
msousa@417:
mjsousa@838: /* visitors to CAL_operator_c, CALC_operator_c and CALCN_operator_c are called from visit(il_fb_call_c *) {symbol->il_call_operator->accept(*this)} */
msousa@487: /* NOTE: The CAL, JMP and RET instructions simply set the desired datatype of the previous il instruction since they do not change the value in the current/default IL variable */
msousa@487: void *narrow_candidate_datatypes_c::visit( CAL_operator_c *symbol) {set_datatype_in_prev_il_instructions(symbol->datatype, fake_prev_il_instruction); return NULL;}
msousa@487: void *narrow_candidate_datatypes_c::visit( RET_operator_c *symbol) {set_datatype_in_prev_il_instructions(symbol->datatype, fake_prev_il_instruction); return NULL;}
msousa@487: void *narrow_candidate_datatypes_c::visit( JMP_operator_c *symbol) {set_datatype_in_prev_il_instructions(symbol->datatype, fake_prev_il_instruction); return NULL;}
mjsousa@838: void *narrow_candidate_datatypes_c::visit( CALC_operator_c *symbol) {return narrow_conditional_operator(symbol);}
mjsousa@838: void *narrow_candidate_datatypes_c::visit(CALCN_operator_c *symbol) {return narrow_conditional_operator(symbol);}
mjsousa@838: void *narrow_candidate_datatypes_c::visit( RETC_operator_c *symbol) {return narrow_conditional_operator(symbol);}
mjsousa@838: void *narrow_candidate_datatypes_c::visit(RETCN_operator_c *symbol) {return narrow_conditional_operator(symbol);}
mjsousa@838: void *narrow_candidate_datatypes_c::visit( JMPC_operator_c *symbol) {return narrow_conditional_operator(symbol);}
mjsousa@838: void *narrow_candidate_datatypes_c::visit(JMPCN_operator_c *symbol) {return narrow_conditional_operator(symbol);}
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: /***********************/
mjsousa@873: /* SYM_REF1(ref_expression_c, exp) --> an extension to the IEC 61131-3 standard - based on the IEC 61131-3 v3 standard. Returns address of the varible! */
mjsousa@873: void *narrow_candidate_datatypes_c::visit( ref_expression_c *symbol) {
mjsousa@873: if (symbol->exp->candidate_datatypes.size() > 0) {
mjsousa@873: symbol->exp->datatype = symbol->exp->candidate_datatypes[0]; /* just use the first possible datatype */
mjsousa@873: symbol->exp->accept(*this);
mjsousa@873: }
mjsousa@873: return NULL;
mjsousa@873: }
mjsousa@873:
mjsousa@873:
mjsousa@873:
msousa@652: /* allow_enums is FALSE by default!!
msousa@652: * deprecated_operation is NULL by default!!
msousa@652: * if (allow_enums) then consider that we are ectually processing an equ_expression or notequ_expression, where two enums of the same data type may also be legally compared
msousa@652: * e.g. symbol := l_expr == r_expr
msousa@652: * symbol := l_expr != r_expr
msousa@652: * In the above situation it is a legal operation when (l_expr.datatype == r_expr.datatype) && is_enumerated(r/l_expr.datatype) && is_bool(symbol.datatype)
msousa@652: */
msousa@652: void *narrow_candidate_datatypes_c::narrow_binary_expression(const struct widen_entry widen_table[], symbol_c *symbol, symbol_c *l_expr, symbol_c *r_expr, bool *deprecated_operation, bool allow_enums) {
msousa@480: symbol_c *l_type, *r_type;
msousa@480: int count = 0;
msousa@652:
msousa@652: if (NULL != deprecated_operation)
msousa@480: *deprecated_operation = false;
msousa@480:
msousa@480: for(unsigned int i = 0; i < l_expr->candidate_datatypes.size(); i++) {
msousa@480: for(unsigned int j = 0; j < r_expr->candidate_datatypes.size(); j++) {
msousa@480: /* test widening compatibility */
msousa@480: l_type = l_expr->candidate_datatypes[i];
msousa@480: r_type = r_expr->candidate_datatypes[j];
msousa@652: if (is_widening_compatible(widen_table, l_type, r_type, symbol->datatype, deprecated_operation)) {
msousa@652: l_expr->datatype = l_type;
msousa@652: r_expr->datatype = r_type;
msousa@652: count ++;
msousa@854: } else if ((l_type == r_type) && get_datatype_info_c::is_enumerated(l_type) && get_datatype_info_c::is_BOOL_compatible(symbol->datatype)) {
msousa@652: if (NULL != deprecated_operation) *deprecated_operation = false;
msousa@480: l_expr->datatype = l_type;
msousa@480: r_expr->datatype = r_type;
msousa@480: count ++;
msousa@480: }
msousa@652:
msousa@480: }
msousa@480: }
msousa@480: // if (count > 1) ERROR; /* Since we also support SAFE data types, this assertion is not necessarily always tru! */
msousa@676: if (get_datatype_info_c::is_type_valid(symbol->datatype) && (count <= 0)) ERROR;
msousa@480:
msousa@480: l_expr->accept(*this);
msousa@480: r_expr->accept(*this);
msousa@480: return NULL;
msousa@480: }
msousa@480:
msousa@417:
msousa@652: void *narrow_candidate_datatypes_c::narrow_equality_comparison(const struct widen_entry widen_table[], symbol_c *symbol, symbol_c *l_expr, symbol_c *r_expr, bool *deprecated_operation) {
msousa@652: return narrow_binary_expression(widen_table, symbol, l_expr, r_expr, deprecated_operation, true);
msousa@652: }
msousa@652:
msousa@652:
msousa@652: void *narrow_candidate_datatypes_c::visit( or_expression_c *symbol) {return narrow_binary_expression ( widen_OR_table, symbol, symbol->l_exp, symbol->r_exp);}
msousa@652: void *narrow_candidate_datatypes_c::visit( xor_expression_c *symbol) {return narrow_binary_expression (widen_XOR_table, symbol, symbol->l_exp, symbol->r_exp);}
msousa@652: void *narrow_candidate_datatypes_c::visit( and_expression_c *symbol) {return narrow_binary_expression (widen_AND_table, symbol, symbol->l_exp, symbol->r_exp);}
msousa@652:
msousa@652: void *narrow_candidate_datatypes_c::visit( equ_expression_c *symbol) {return narrow_equality_comparison(widen_CMP_table, symbol, symbol->l_exp, symbol->r_exp);}
msousa@652: void *narrow_candidate_datatypes_c::visit(notequ_expression_c *symbol) {return narrow_equality_comparison(widen_CMP_table, symbol, symbol->l_exp, symbol->r_exp);}
msousa@652: void *narrow_candidate_datatypes_c::visit( lt_expression_c *symbol) {return narrow_binary_expression (widen_CMP_table, symbol, symbol->l_exp, symbol->r_exp);}
msousa@652: void *narrow_candidate_datatypes_c::visit( gt_expression_c *symbol) {return narrow_binary_expression (widen_CMP_table, symbol, symbol->l_exp, symbol->r_exp);}
msousa@652: void *narrow_candidate_datatypes_c::visit( le_expression_c *symbol) {return narrow_binary_expression (widen_CMP_table, symbol, symbol->l_exp, symbol->r_exp);}
msousa@652: void *narrow_candidate_datatypes_c::visit( ge_expression_c *symbol) {return narrow_binary_expression (widen_CMP_table, symbol, symbol->l_exp, symbol->r_exp);}
msousa@652:
msousa@652: void *narrow_candidate_datatypes_c::visit( add_expression_c *symbol) {return narrow_binary_expression (widen_ADD_table, symbol, symbol->l_exp, symbol->r_exp, &symbol->deprecated_operation);}
msousa@652: void *narrow_candidate_datatypes_c::visit( sub_expression_c *symbol) {return narrow_binary_expression (widen_SUB_table, symbol, symbol->l_exp, symbol->r_exp, &symbol->deprecated_operation);}
msousa@652: void *narrow_candidate_datatypes_c::visit( mul_expression_c *symbol) {return narrow_binary_expression (widen_MUL_table, symbol, symbol->l_exp, symbol->r_exp, &symbol->deprecated_operation);}
msousa@652: void *narrow_candidate_datatypes_c::visit( div_expression_c *symbol) {return narrow_binary_expression (widen_DIV_table, symbol, symbol->l_exp, symbol->r_exp, &symbol->deprecated_operation);}
msousa@652: void *narrow_candidate_datatypes_c::visit( mod_expression_c *symbol) {return narrow_binary_expression (widen_MOD_table, symbol, symbol->l_exp, symbol->r_exp);}
msousa@652: void *narrow_candidate_datatypes_c::visit( power_expression_c *symbol) {return narrow_binary_expression (widen_EXPT_table,symbol, symbol->l_exp, symbol->r_exp);}
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@666: if (get_datatype_info_c::is_BOOL_compatible(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->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@666: if (get_datatype_info_c::is_BOOL_compatible(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: /* 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@666: if ((get_datatype_info_c::is_ANY_INT(symbol->expression->candidate_datatypes[i]))
msousa@854: || (get_datatype_info_c::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@676: if (get_datatype_info_c::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@666: if (get_datatype_info_c::is_ANY_INT(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@676: if (get_datatype_info_c::is_type_equal(symbol->control_variable->datatype,symbol->beg_expression->candidate_datatypes[i]) &&
msousa@666: get_datatype_info_c::is_ANY_INT(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@676: if (get_datatype_info_c::is_type_equal(symbol->control_variable->datatype,symbol->end_expression->candidate_datatypes[i]) &&
msousa@666: get_datatype_info_c::is_ANY_INT(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@676: if (get_datatype_info_c::is_type_equal(symbol->control_variable->datatype,symbol->by_expression->candidate_datatypes[i]) &&
msousa@666: get_datatype_info_c::is_ANY_INT(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@666: if(get_datatype_info_c::is_BOOL(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@666: if(get_datatype_info_c::is_BOOL(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: