msousa@417: /*
msousa@417: * matiec - a compiler for the programming languages defined in IEC 61131-3
msousa@417: *
msousa@417: * Copyright (C) 2009-2012 Mario de Sousa (msousa@fe.up.pt)
msousa@417: * Copyright (C) 2012 Manuele Conti (manuele.conti@sirius-es.it)
msousa@417: * Copyright (C) 2012 Matteo Facchinetti (matteo.facchinetti@sirius-es.it)
msousa@417: *
msousa@417: * This program is free software: you can redistribute it and/or modify
msousa@417: * it under the terms of the GNU General Public License as published by
msousa@417: * the Free Software Foundation, either version 3 of the License, or
msousa@417: * (at your option) any later version.
msousa@417: *
msousa@417: * This program is distributed in the hope that it will be useful,
msousa@417: * but WITHOUT ANY WARRANTY; without even the implied warranty of
msousa@417: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
msousa@417: * GNU General Public License for more details.
msousa@417: *
msousa@417: * You should have received a copy of the GNU General Public License
msousa@417: * along with this program. If not, see .
msousa@417: *
msousa@417: *
msousa@417: * This code is made available on the understanding that it will not be
msousa@417: * used in safety-critical situations without a full and competent review.
msousa@417: */
msousa@417:
msousa@417: /*
msousa@417: * An IEC 61131-3 compiler.
msousa@417: *
msousa@417: * Based on the
msousa@417: * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
msousa@417: *
msousa@417: */
msousa@417:
msousa@417:
msousa@417: /*
msousa@417: * Narrow class select and store a data type from candidate data types list for all symbols
msousa@417: */
msousa@417:
msousa@417: #include "narrow_candidate_datatypes.hh"
msousa@417: #include "datatype_functions.hh"
msousa@417: #include
msousa@417: #include
msousa@417: #include
msousa@417: #include
msousa@417: #include
msousa@417:
msousa@417:
msousa@417: /* set to 1 to see debug info during execution */
msousa@417: static int debug = 0;
msousa@417:
msousa@417: narrow_candidate_datatypes_c::narrow_candidate_datatypes_c(symbol_c *ignore) {
msousa@417: }
msousa@417:
msousa@417: narrow_candidate_datatypes_c::~narrow_candidate_datatypes_c(void) {
msousa@417: }
msousa@417:
msousa@417: bool narrow_candidate_datatypes_c::is_widening_compatible(symbol_c *left_type, symbol_c *right_type, symbol_c *result_type, const struct widen_entry widen_table[]) {
msousa@417: for (int k = 0; NULL != widen_table[k].left; k++) {
msousa@417: if ((typeid(*left_type) == typeid(*widen_table[k].left))
msousa@417: && (typeid(*right_type) == typeid(*widen_table[k].right))
msousa@417: && (typeid(*result_type) == typeid(*widen_table[k].result))) {
msousa@417: return true;
msousa@417: }
msousa@417: }
msousa@417: return false;
msousa@417: }
msousa@417:
msousa@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@417: call_param_value->datatype = base_type(fp_iterator.param_type());
msousa@424: if ((NULL != param_name) && (NULL == call_param_value->datatype)) ERROR;
msousa@424: if ((NULL == param_name) && (NULL != call_param_value->datatype)) ERROR;
msousa@417: 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:
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@423: call_param_value->datatype = base_type(fp_iterator.param_type());
msousa@424: if ((NULL != param_name) && (NULL == call_param_value->datatype)) ERROR;
msousa@424: if ((NULL == param_name) && (NULL != call_param_value->datatype)) ERROR;
msousa@424:
msousa@423: 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@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@417:
msousa@417: /* a helper function... */
msousa@417: symbol_c *narrow_candidate_datatypes_c::base_type(symbol_c *symbol) {
msousa@417: /* NOTE: symbol == NULL is valid. It will occur when, for e.g., an undefined/undeclared symbolic_variable is used
msousa@417: * in the code.
msousa@417: */
msousa@423: if (symbol == NULL) return NULL;
msousa@423: return (symbol_c *)symbol->accept(search_base_type);
msousa@417: }
msousa@417:
msousa@417: /*********************/
msousa@417: /* B 1.2 - Constants */
msousa@417: /*********************/
msousa@417:
msousa@417: /**********************/
msousa@417: /* B 1.3 - Data types */
msousa@417: /**********************/
msousa@417: /********************************/
msousa@417: /* B 1.3.3 - Derived data types */
msousa@417: /********************************/
msousa@417: /* signed_integer DOTDOT signed_integer */
msousa@417: // SYM_REF2(subrange_c, lower_limit, upper_limit)
msousa@417: void *narrow_candidate_datatypes_c::visit(subrange_c *symbol) {
msousa@417: symbol->lower_limit->datatype = symbol->datatype;
msousa@417: symbol->lower_limit->accept(*this);
msousa@417: symbol->upper_limit->datatype = symbol->datatype;
msousa@417: symbol->upper_limit->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: /*********************/
msousa@417: /* B 1.4 - Variables */
msousa@417: /*********************/
msousa@417:
msousa@417: /********************************************/
msousa@417: /* B 1.4.1 - Directly Represented Variables */
msousa@417: /********************************************/
msousa@417:
msousa@417: /*************************************/
msousa@417: /* B 1.4.2 - Multi-element variables */
msousa@417: /*************************************/
msousa@417: /* subscripted_variable '[' subscript_list ']' */
msousa@417: // SYM_REF2(array_variable_c, subscripted_variable, subscript_list)
msousa@417: void *narrow_candidate_datatypes_c::visit(array_variable_c *symbol) {
msousa@417: /* we need to check the data types of the expressions used for the subscripts... */
msousa@417: symbol->subscript_list->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: /* subscript_list ',' subscript */
msousa@417: // SYM_LIST(subscript_list_c)
msousa@417: void *narrow_candidate_datatypes_c::visit(subscript_list_c *symbol) {
msousa@417: for (int i = 0; i < symbol->n; i++) {
msousa@417: for (unsigned int k = 0; k < symbol->elements[i]->candidate_datatypes.size(); k++) {
msousa@417: if (is_ANY_INT_type(symbol->elements[i]->candidate_datatypes[k]))
msousa@417: symbol->elements[i]->datatype = symbol->elements[i]->candidate_datatypes[k];
msousa@417: }
msousa@417: symbol->elements[i]->accept(*this);
msousa@417: }
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417:
msousa@417: /************************************/
msousa@417: /* B 1.5 Program organization units */
msousa@417: /************************************/
msousa@417: /*********************/
msousa@417: /* B 1.5.1 Functions */
msousa@417: /*********************/
msousa@417: void *narrow_candidate_datatypes_c::visit(function_declaration_c *symbol) {
msousa@417: search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
msousa@417: if (debug) printf("Narrowing candidate data types list in body of function %s\n", ((token_c *)(symbol->derived_function_name))->value);
msousa@417: prev_il_instruction = NULL;
msousa@417: symbol->function_body->accept(*this);
msousa@417: prev_il_instruction = NULL;
msousa@417: delete search_varfb_instance_type;
msousa@417: search_varfb_instance_type = NULL;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: /***************************/
msousa@417: /* B 1.5.2 Function blocks */
msousa@417: /***************************/
msousa@417: void *narrow_candidate_datatypes_c::visit(function_block_declaration_c *symbol) {
msousa@417: search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
msousa@417: if (debug) printf("Narrowing candidate data types list in body of FB %s\n", ((token_c *)(symbol->fblock_name))->value);
msousa@417: prev_il_instruction = NULL;
msousa@417: symbol->fblock_body->accept(*this);
msousa@417: prev_il_instruction = NULL;
msousa@417: delete search_varfb_instance_type;
msousa@417: search_varfb_instance_type = NULL;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: /********************/
msousa@417: /* B 1.5.3 Programs */
msousa@417: /********************/
msousa@417: void *narrow_candidate_datatypes_c::visit(program_declaration_c *symbol) {
msousa@417: search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
msousa@417: if (debug) printf("Narrowing candidate data types list in body of program %s\n", ((token_c *)(symbol->program_type_name))->value);
msousa@417: prev_il_instruction = NULL;
msousa@417: symbol->function_block_body->accept(*this);
msousa@417: prev_il_instruction = NULL;
msousa@417: delete search_varfb_instance_type;
msousa@417: search_varfb_instance_type = NULL;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: /********************************/
msousa@417: /* B 1.7 Configuration elements */
msousa@417: /********************************/
msousa@417: void *narrow_candidate_datatypes_c::visit(configuration_declaration_c *symbol) {
msousa@417: #if 0
msousa@417: // TODO !!!
msousa@417: /* for the moment we must return NULL so semantic analysis of remaining code is not interrupted! */
msousa@417: #endif
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: /****************************************/
msousa@417: /* B.2 - Language IL (Instruction List) */
msousa@417: /****************************************/
msousa@417: /***********************************/
msousa@417: /* B 2.1 Instructions and Operands */
msousa@417: /***********************************/
msousa@417: // void *visit(instruction_list_c *symbol);
msousa@417: void *narrow_candidate_datatypes_c::visit(il_simple_operation_c *symbol) {
msousa@417: il_operand = symbol->il_operand;
msousa@417: if (NULL != symbol->il_operand) {
msousa@417: symbol->il_operand->accept(*this);
msousa@417: }
msousa@417: /* recursive call to see whether data types are compatible */
msousa@417: symbol->il_simple_operator->accept(*this);
msousa@417: il_operand = NULL;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(il_function_call_c *symbol) {
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: /* MJS: Manuele, could you please not delete the following 2 lines of comments. They help me understand where this class is used
msousa@417: * and when it is created by bison - syntax parse, and how it can show up in the abstract syntax tree.
msousa@417: *
msousa@417: * Actually, it could be helpful if we could have all the similar comments already present in visit_expression_type_c
msousa@417: * in the 3 new classes fill/narrow/print candidate datatype
msousa@417: */
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@417: /* MJS: TODO... */
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(il_fb_call_c *symbol) {
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(il_formal_funct_call_c *symbol) {
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: /*
msousa@417: void *visit(il_operand_list_c *symbol);
msousa@417: void *visit(simple_instr_list_c *symbol);
msousa@417: void *visit(il_param_list_c *symbol);
msousa@417: void *visit(il_param_assignment_c *symbol);
msousa@417: void *visit(il_param_out_assignment_c *symbol);
msousa@417: */
msousa@417:
msousa@417: /*******************/
msousa@417: /* B 2.2 Operators */
msousa@417: /*******************/
msousa@417: void *narrow_candidate_datatypes_c::visit(LD_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(LDN_operator_c *symbol) {
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@417: il_operand->datatype = symbol->datatype;
msousa@417: il_operand->accept(*this);
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(ST_operator_c *symbol) {
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@417: il_operand->datatype = symbol->datatype;
msousa@417: il_operand->accept(*this);
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(STN_operator_c *symbol) {
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@417: il_operand->datatype = symbol->datatype;
msousa@417: il_operand->accept(*this);
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(NOT_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(S_operator_c *symbol) {
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@417: il_operand->datatype = symbol->datatype;
msousa@417: il_operand->accept(*this);
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(R_operator_c *symbol) {
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@417: il_operand->datatype = symbol->datatype;
msousa@417: il_operand->accept(*this);
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(S1_operator_c *symbol) {
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@417: il_operand->datatype = symbol->datatype;
msousa@417: il_operand->accept(*this);
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(R1_operator_c *symbol) {
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@417: il_operand->datatype = symbol->datatype;
msousa@417: il_operand->accept(*this);
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(CLK_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(CU_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(CD_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(PV_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(IN_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(PT_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(AND_operator_c *symbol) {
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@417: il_operand->datatype = symbol->datatype;
msousa@417: il_operand->accept(*this);
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(OR_operator_c *symbol) {
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@417: il_operand->datatype = symbol->datatype;
msousa@417: il_operand->accept(*this);
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(XOR_operator_c *symbol) {
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@417: il_operand->datatype = symbol->datatype;
msousa@417: il_operand->accept(*this);
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(ANDN_operator_c *symbol) {
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@417: il_operand->datatype = symbol->datatype;
msousa@417: il_operand->accept(*this);
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(ORN_operator_c *symbol) {
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@417: il_operand->datatype = symbol->datatype;
msousa@417: il_operand->accept(*this);
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(XORN_operator_c *symbol) {
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@417: il_operand->datatype = symbol->datatype;
msousa@417: il_operand->accept(*this);
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(ADD_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(SUB_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(MUL_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(DIV_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(MOD_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(GT_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(GE_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(EQ_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(LT_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(LE_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(NE_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(CAL_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(CALC_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(CALCN_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(RET_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(RETC_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(RETCN_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(JMP_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(JMPC_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(JMPCN_operator_c *symbol) {
msousa@417: prev_il_instruction = symbol;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: /* Symbol class handled together with function call checks */
msousa@417: // void *visit(il_assign_operator_c *symbol, variable_name);
msousa@417: /* Symbol class handled together with function call checks */
msousa@417: // void *visit(il_assign_operator_c *symbol, option, variable_name);
msousa@417:
msousa@417:
msousa@417: /***************************************/
msousa@417: /* B.3 - Language ST (Structured Text) */
msousa@417: /***************************************/
msousa@417: /***********************/
msousa@417: /* B 3.1 - Expressions */
msousa@417: /***********************/
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(or_expression_c *symbol) {
msousa@417: symbol_c * selected_type = NULL;
msousa@417: for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: if (is_type_equal(symbol->l_exp->candidate_datatypes[i], symbol->r_exp->candidate_datatypes[j])) {
msousa@417: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(xor_expression_c *symbol) {
msousa@417: symbol_c * selected_type = NULL;
msousa@417: for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: if (is_type_equal(symbol->l_exp->candidate_datatypes[i], symbol->r_exp->candidate_datatypes[j])) {
msousa@417: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(and_expression_c *symbol) {
msousa@417: symbol_c * selected_type = NULL;
msousa@417: for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: if (typeid(*symbol->l_exp->candidate_datatypes[i]) == typeid(*symbol->r_exp->candidate_datatypes[j])) {
msousa@417: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(equ_expression_c *symbol) {
msousa@417: /* Here symbol->datatype has already assigned to BOOL
msousa@417: * In conditional symbols like =, <>, =<, <, >, >= we have to set
msousa@417: * l_exp and r_exp expression matched with compatible type.
msousa@417: * Example:
msousa@417: * INT#14 = INT#81
msousa@417: * equ_expression_c symbol->datatype = BOOL from top visit
msousa@417: * symbol->l_exp->datatype => INT
msousa@417: * symbol->r_exp->datatype => INT
msousa@417: */
msousa@417: symbol_c * selected_type = NULL;
msousa@417: for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: if (typeid(*symbol->l_exp->candidate_datatypes[i]) == typeid(*symbol->r_exp->candidate_datatypes[j])) {
msousa@417: /*
msousa@417: * We do not need to check whether the type is an ANY_ELEMENTARY here.
msousa@417: * That was already done in fill_candidate_datatypes_c.
msousa@417: */
msousa@417: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(notequ_expression_c *symbol) {
msousa@417: symbol_c * selected_type = NULL;
msousa@417: for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: if (typeid(*symbol->l_exp->candidate_datatypes[i]) == typeid(*symbol->r_exp->candidate_datatypes[j])) {
msousa@417: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(lt_expression_c *symbol) {
msousa@417: symbol_c * selected_type = NULL;
msousa@417: for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: if (typeid(*symbol->l_exp->candidate_datatypes[i]) == typeid(*symbol->r_exp->candidate_datatypes[j])
msousa@417: && is_ANY_ELEMENTARY_type(symbol->l_exp->candidate_datatypes[i])) {
msousa@417: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(gt_expression_c *symbol) {
msousa@417: symbol_c * selected_type = NULL;
msousa@417: for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: if (typeid(*symbol->l_exp->candidate_datatypes[i]) == typeid(*symbol->r_exp->candidate_datatypes[j])
msousa@417: && is_ANY_ELEMENTARY_type(symbol->l_exp->candidate_datatypes[i])) {
msousa@417: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(le_expression_c *symbol) {
msousa@417: symbol_c * selected_type = NULL;
msousa@417: for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: if (typeid(*symbol->l_exp->candidate_datatypes[i]) == typeid(*symbol->r_exp->candidate_datatypes[j])
msousa@417: && is_ANY_ELEMENTARY_type(symbol->l_exp->candidate_datatypes[i])) {
msousa@417: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(ge_expression_c *symbol) {
msousa@417: symbol_c * selected_type = NULL;
msousa@417: for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: if (typeid(*symbol->l_exp->candidate_datatypes[i]) == typeid(*symbol->r_exp->candidate_datatypes[j])
msousa@417: && is_ANY_ELEMENTARY_type(symbol->l_exp->candidate_datatypes[i])) {
msousa@417: selected_type = symbol->l_exp->candidate_datatypes[i];
msousa@417: break;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417:
msousa@417: if (NULL != selected_type) {
msousa@417: symbol->l_exp->datatype = selected_type;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = selected_type;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: else
msousa@417: ERROR;
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(add_expression_c *symbol) {
msousa@417: int count = 0;
msousa@417:
msousa@417: if (is_ANY_NUM_compatible(symbol->datatype)) {
msousa@417: symbol->l_exp->datatype = symbol->datatype;
msousa@417: symbol->r_exp->datatype = symbol->datatype;
msousa@417: count++;
msousa@417: } else {
msousa@417: /* TIME data type */
msousa@417: for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: /* test widening compatibility */
msousa@417: if (is_widening_compatible(symbol->l_exp->candidate_datatypes[i],
msousa@417: symbol->r_exp->candidate_datatypes[j],
msousa@417: symbol->datatype, widen_ADD_table)) {
msousa@417: symbol->l_exp->datatype = symbol->l_exp->candidate_datatypes[i];
msousa@417: symbol->r_exp->datatype = symbol->r_exp->candidate_datatypes[j];
msousa@417: count ++;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417: if (count > 1)
msousa@417: ERROR;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(sub_expression_c *symbol) {
msousa@417: int count = 0;
msousa@417:
msousa@417: if (is_ANY_NUM_compatible(symbol->datatype)) {
msousa@417: symbol->l_exp->datatype = symbol->datatype;
msousa@417: symbol->r_exp->datatype = symbol->datatype;
msousa@417: count++;
msousa@417: } else {
msousa@417: /* TIME data type */
msousa@417: for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: /* test widening compatibility */
msousa@417: if (is_widening_compatible(symbol->l_exp->candidate_datatypes[i],
msousa@417: symbol->r_exp->candidate_datatypes[j],
msousa@417: symbol->datatype, widen_SUB_table)) {
msousa@417: symbol->l_exp->datatype = symbol->l_exp->candidate_datatypes[i];
msousa@417: symbol->r_exp->datatype = symbol->r_exp->candidate_datatypes[j];
msousa@417: count ++;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417: if (count > 1)
msousa@417: ERROR;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(mul_expression_c *symbol) {
msousa@417: int count = 0;
msousa@417:
msousa@417: if (is_ANY_NUM_compatible(symbol->datatype)) {
msousa@417: symbol->l_exp->datatype = symbol->datatype;
msousa@417: symbol->r_exp->datatype = symbol->datatype;
msousa@417: count++;
msousa@417: } else {
msousa@417: /* TIME data type */
msousa@417: for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: /* test widening compatibility */
msousa@417: if (is_widening_compatible(symbol->l_exp->candidate_datatypes[i],
msousa@417: symbol->r_exp->candidate_datatypes[j],
msousa@417: symbol->datatype, widen_MUL_table)) {
msousa@417: symbol->l_exp->datatype = symbol->l_exp->candidate_datatypes[i];
msousa@417: symbol->r_exp->datatype = symbol->r_exp->candidate_datatypes[j];
msousa@417: count ++;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417: if (count > 1)
msousa@417: ERROR;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(div_expression_c *symbol) {
msousa@417: int count = 0;
msousa@417:
msousa@417: if (is_ANY_NUM_compatible(symbol->datatype)) {
msousa@417: symbol->l_exp->datatype = symbol->datatype;
msousa@417: symbol->r_exp->datatype = symbol->datatype;
msousa@417: count++;
msousa@417: } else {
msousa@417: /* TIME data type */
msousa@417: for(unsigned int i = 0; i < symbol->l_exp->candidate_datatypes.size(); i++) {
msousa@417: for(unsigned int j = 0; j < symbol->r_exp->candidate_datatypes.size(); j++) {
msousa@417: /* test widening compatibility */
msousa@417: if (is_widening_compatible(symbol->l_exp->candidate_datatypes[i],
msousa@417: symbol->r_exp->candidate_datatypes[j],
msousa@417: symbol->datatype, widen_DIV_table)) {
msousa@417: symbol->l_exp->datatype = symbol->l_exp->candidate_datatypes[i];
msousa@417: symbol->r_exp->datatype = symbol->r_exp->candidate_datatypes[j];
msousa@417: count ++;
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417: }
msousa@417: if (count > 1)
msousa@417: ERROR;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(mod_expression_c *symbol) {
msousa@417: symbol->l_exp->datatype = symbol->datatype;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = symbol->datatype;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(power_expression_c *symbol) {
msousa@417: symbol->l_exp->datatype = symbol->datatype;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: if (! symbol->r_exp->candidate_datatypes.size()){
msousa@417: symbol->r_exp->datatype = symbol->r_exp->candidate_datatypes[0];
msousa@417: symbol->r_exp->accept(*this);
msousa@417: }
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(neg_expression_c *symbol) {
msousa@417: symbol->exp->datatype = symbol->datatype;
msousa@417: symbol->exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(not_expression_c *symbol) {
msousa@417: symbol->exp->datatype = symbol->datatype;
msousa@417: symbol->exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(function_invocation_c *symbol) {
msousa@421: int ext_parm_count;
msousa@421:
msousa@424: /* set the called_function_declaration. */
msousa@421: symbol->called_function_declaration = NULL;
msousa@424: if (symbol->candidate_datatypes.size() == 1) {
msousa@424: /* If only one possible called function, then that is the function to call!
msousa@424: * In this case we ignore the symbol->datatype value (that may even be NULL).
msousa@424: * This helps in identifying potential errors in the expressions used inside this function call
msousa@424: * even if there is a previous error, allowing us to make a more thorough analysis of the semantics
msousa@424: * of the ST code, and providing as many relevant error messages as possible!
msousa@424: * If symbol->datatype isn't NULL, then this chosen function should be returning the required datatype,
msousa@424: * otherwise we have a bug in our stage3 code!
msousa@424: */
msousa@424: symbol->called_function_declaration = symbol->candidate_functions[0];
msousa@424: if ((NULL != symbol->datatype) && (!is_type_equal(symbol->candidate_datatypes[0], symbol->datatype)))
msousa@424: ERROR;
msousa@424: }
msousa@424: else {
msousa@424: /* set the called_function_declaration taking into account the datatype that we need to return */
msousa@424: symbol->called_function_declaration = NULL;
msousa@424: for(unsigned int i = 0; i < symbol->candidate_datatypes.size(); i++) {
msousa@424: if (is_type_equal(symbol->candidate_datatypes[i], symbol->datatype)) {
msousa@424: symbol->called_function_declaration = symbol->candidate_functions[i];
msousa@424: break;
msousa@424: }
msousa@424: }
msousa@424: }
msousa@424: /* NOTE: If we can't figure out the declaration of the function being called, this is not
msousa@424: * necessarily an internal compiler error. It could be because the symbol->datatype is NULL
msousa@424: * (because the ST code being analysed has an error _before_ this function invocation).
msousa@424: * However, we don't just give, up, we carry on recursivly analysing the code, so as to be
msousa@424: * able to print out any error messages related to underlying code that could be partially correct.
msousa@424: */
msousa@424: /* if (NULL == symbol->called_function_declaration) ERROR; */
msousa@421:
msousa@421: if (NULL != symbol->nonformal_param_list) narrow_nonformal_call(symbol, symbol->called_function_declaration, &ext_parm_count);
msousa@421: if (NULL != symbol-> formal_param_list) narrow_formal_call(symbol, symbol->called_function_declaration, &ext_parm_count);
msousa@421: symbol->extensible_param_count = ext_parm_count;
msousa@417:
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: /********************/
msousa@417: /* B 3.2 Statements */
msousa@417: /********************/
msousa@417:
msousa@417:
msousa@417: /*********************************/
msousa@417: /* B 3.2.1 Assignment Statements */
msousa@417: /*********************************/
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(assignment_statement_c *symbol) {
msousa@417: if (symbol->candidate_datatypes.size() != 1)
msousa@417: return NULL;
msousa@417: symbol->datatype = symbol->candidate_datatypes[0];
msousa@417: symbol->l_exp->datatype = symbol->datatype;
msousa@417: symbol->l_exp->accept(*this);
msousa@417: symbol->r_exp->datatype = symbol->datatype;
msousa@417: symbol->r_exp->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: /*****************************************/
msousa@417: /* B 3.2.2 Subprogram Control Statements */
msousa@417: /*****************************************/
msousa@417:
msousa@423: void *narrow_candidate_datatypes_c::visit(fb_invocation_c *symbol) {
msousa@424: /* Note: We do not use the symbol->called_fb_declaration value (set in fill_candidate_datatypes_c)
msousa@424: * because we try to identify any other datatype errors in the expressions used in the
msousa@424: * parameters to the FB call (e.g. fb_var(var1 * 56 + func(var * 43)) )
msousa@424: * even it the call to the FB is invalid.
msousa@424: * This makes sense because it may be errors in those expressions which are
msousa@424: * making this an invalid call, so it makes sense to point them out to the user!
msousa@424: */
msousa@423: symbol_c *fb_decl = search_varfb_instance_type->get_basetype_decl(symbol->fb_name);
msousa@424:
msousa@424: /* Although a call to a non-declared FB is a semantic error, this is currently caught by stage 2! */
msousa@423: if (NULL == fb_decl) ERROR;
msousa@423: if (NULL != symbol->nonformal_param_list) narrow_nonformal_call(symbol, fb_decl);
msousa@423: if (NULL != symbol-> formal_param_list) narrow_formal_call(symbol, fb_decl);
msousa@423:
msousa@423: return NULL;
msousa@423: }
msousa@423:
msousa@423:
msousa@417: /********************************/
msousa@417: /* B 3.2.3 Selection Statements */
msousa@417: /********************************/
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(if_statement_c *symbol) {
msousa@417: for(unsigned int i = 0; i < symbol->expression->candidate_datatypes.size(); i++) {
msousa@417: if (is_type(symbol->expression->candidate_datatypes[i], bool_type_name_c))
msousa@417: symbol->expression->datatype = symbol->expression->candidate_datatypes[i];
msousa@417: }
msousa@417: symbol->expression->accept(*this);
msousa@417: if (NULL != symbol->statement_list)
msousa@417: symbol->statement_list->accept(*this);
msousa@417: if (NULL != symbol->elseif_statement_list)
msousa@417: symbol->elseif_statement_list->accept(*this);
msousa@417: if (NULL != symbol->else_statement_list)
msousa@417: symbol->else_statement_list->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(elseif_statement_c *symbol) {
msousa@417: for (unsigned int i = 0; i < symbol->expression->candidate_datatypes.size(); i++) {
msousa@417: if (is_type(symbol->expression->candidate_datatypes[i], bool_type_name_c))
msousa@417: symbol->expression->datatype = symbol->expression->candidate_datatypes[i];
msousa@417: }
msousa@417: symbol->expression->accept(*this);
msousa@417: if (NULL != symbol->statement_list)
msousa@417: symbol->statement_list->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: /* CASE expression OF case_element_list ELSE statement_list END_CASE */
msousa@417: // SYM_REF3(case_statement_c, expression, case_element_list, statement_list)
msousa@417: void *narrow_candidate_datatypes_c::visit(case_statement_c *symbol) {
msousa@417: for (unsigned int i = 0; i < symbol->expression->candidate_datatypes.size(); i++) {
msousa@417: if ((is_ANY_INT_type(symbol->expression->candidate_datatypes[i]))
msousa@417: || (search_base_type.type_is_enumerated(symbol->expression->candidate_datatypes[i])))
msousa@417: symbol->expression->datatype = symbol->expression->candidate_datatypes[i];
msousa@417: }
msousa@417: symbol->expression->accept(*this);
msousa@417: if (NULL != symbol->statement_list)
msousa@417: symbol->statement_list->accept(*this);
msousa@417: if (NULL != symbol->case_element_list) {
msousa@417: symbol->case_element_list->datatype = symbol->expression->datatype;
msousa@417: symbol->case_element_list->accept(*this);
msousa@417: }
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: /* helper symbol for case_statement */
msousa@417: // SYM_LIST(case_element_list_c)
msousa@417: void *narrow_candidate_datatypes_c::visit(case_element_list_c *symbol) {
msousa@417: for (int i = 0; i < symbol->n; i++) {
msousa@417: symbol->elements[i]->datatype = symbol->datatype;
msousa@417: symbol->elements[i]->accept(*this);
msousa@417: }
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: /* case_list ':' statement_list */
msousa@417: // SYM_REF2(case_element_c, case_list, statement_list)
msousa@417: void *narrow_candidate_datatypes_c::visit(case_element_c *symbol) {
msousa@417: symbol->case_list->datatype = symbol->datatype;
msousa@417: symbol->case_list->accept(*this);
msousa@417: symbol->statement_list->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: // SYM_LIST(case_list_c)
msousa@417: void *narrow_candidate_datatypes_c::visit(case_list_c *symbol) {
msousa@417: for (int i = 0; i < symbol->n; i++) {
msousa@417: for (unsigned int k = 0; k < symbol->elements[i]->candidate_datatypes.size(); k++) {
msousa@417: if (is_type_equal(symbol->datatype, symbol->elements[i]->candidate_datatypes[k]))
msousa@417: symbol->elements[i]->datatype = symbol->elements[i]->candidate_datatypes[k];
msousa@417: }
msousa@417: /* NOTE: this may be an integer, a subrange_c, or a enumerated value! */
msousa@417: symbol->elements[i]->accept(*this);
msousa@417: }
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417: /********************************/
msousa@417: /* B 3.2.4 Iteration Statements */
msousa@417: /********************************/
msousa@417: void *narrow_candidate_datatypes_c::visit(for_statement_c *symbol) {
msousa@417: /* Control variable */
msousa@417: for(unsigned int i = 0; i < symbol->control_variable->candidate_datatypes.size(); i++) {
msousa@417: if (is_ANY_INT_type(symbol->control_variable->candidate_datatypes[i])) {
msousa@417: symbol->control_variable->datatype = symbol->control_variable->candidate_datatypes[i];
msousa@417: }
msousa@417: }
msousa@417: symbol->control_variable->accept(*this);
msousa@417: /* BEG expression */
msousa@417: for(unsigned int i = 0; i < symbol->beg_expression->candidate_datatypes.size(); i++) {
msousa@417: if (is_type_equal(symbol->control_variable->datatype,symbol->beg_expression->candidate_datatypes[i]) &&
msousa@417: is_ANY_INT_type(symbol->beg_expression->candidate_datatypes[i])) {
msousa@417: symbol->beg_expression->datatype = symbol->beg_expression->candidate_datatypes[i];
msousa@417: }
msousa@417: }
msousa@417: symbol->beg_expression->accept(*this);
msousa@417: /* END expression */
msousa@417: for(unsigned int i = 0; i < symbol->end_expression->candidate_datatypes.size(); i++) {
msousa@417: if (is_type_equal(symbol->control_variable->datatype,symbol->end_expression->candidate_datatypes[i]) &&
msousa@417: is_ANY_INT_type(symbol->end_expression->candidate_datatypes[i])) {
msousa@417: symbol->end_expression->datatype = symbol->end_expression->candidate_datatypes[i];
msousa@417: }
msousa@417: }
msousa@417: symbol->end_expression->accept(*this);
msousa@417: /* BY expression */
msousa@417: if (NULL != symbol->by_expression) {
msousa@417: for(unsigned int i = 0; i < symbol->by_expression->candidate_datatypes.size(); i++) {
msousa@417: if (is_type_equal(symbol->control_variable->datatype,symbol->by_expression->candidate_datatypes[i]) &&
msousa@417: is_ANY_INT_type(symbol->by_expression->candidate_datatypes[i])) {
msousa@417: symbol->by_expression->datatype = symbol->by_expression->candidate_datatypes[i];
msousa@417: }
msousa@417: }
msousa@417: symbol->by_expression->accept(*this);
msousa@417: }
msousa@417: if (NULL != symbol->statement_list)
msousa@417: symbol->statement_list->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(while_statement_c *symbol) {
msousa@417: for (unsigned int i = 0; i < symbol->expression->candidate_datatypes.size(); i++) {
msousa@417: if(is_BOOL_type(symbol->expression->candidate_datatypes[i]))
msousa@417: symbol->expression->datatype = symbol->expression->candidate_datatypes[i];
msousa@417: }
msousa@417: symbol->expression->accept(*this);
msousa@417: if (NULL != symbol->statement_list)
msousa@417: symbol->statement_list->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417: void *narrow_candidate_datatypes_c::visit(repeat_statement_c *symbol) {
msousa@417: for (unsigned int i = 0; i < symbol->expression->candidate_datatypes.size(); i++) {
msousa@417: if(is_BOOL_type(symbol->expression->candidate_datatypes[i]))
msousa@417: symbol->expression->datatype = symbol->expression->candidate_datatypes[i];
msousa@417: }
msousa@417: symbol->expression->accept(*this);
msousa@417: if (NULL != symbol->statement_list)
msousa@417: symbol->statement_list->accept(*this);
msousa@417: return NULL;
msousa@417: }
msousa@417:
msousa@417:
msousa@417:
msousa@417:
msousa@417: