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/*
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* (c) 2003 Mario de Sousa
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*
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* Offered to the public under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* Public License for more details.
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*
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* This code is made available on the understanding that it will not be
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* used in safety-critical situations without a full and competent review.
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*/
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/*
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* An IEC 61131-3 IL and ST compiler.
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*
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* Based on the
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* FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
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*
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*/
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/* Determine the data type of an ST expression.
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* A reference to the relevant type definition is returned.
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*
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* For example:
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* 2 + 3 -> returns reference to a int_type_name_c object.
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* 22.2 - 5 -> returns reference to a real_type_name_c object.
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* etc...
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*/
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#include "function_type_decl.h"
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#include "get_function_type_decl.c"
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#if 0
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typedef enum {function_add,
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function_sub,
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function_and,
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function_or,
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function_sqrt,
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function_none} function_type_t;
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function_type_t get_function_type(identifier_c *function_name) {
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if (!strcasecmp(function_name->value, "ADD"))
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return function_add;
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else if (!strcasecmp(function_name->value, "SUB"))
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return function_sub;
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else if (!strcasecmp(function_name->value, "AND"))
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return function_and;
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else if (!strcasecmp(function_name->value, "OR"))
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return function_or;
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else if (!strcasecmp(function_name->value, "SQRT"))
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return function_sqrt;
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else return function_none;
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}
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#endif
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symbol_c *generate_param_name(const char *name) {
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symbol_c *param_name = new identifier_c(name);
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return param_name;
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}
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symbol_c *generate_param_name(const char *format, int number) {
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char name[10];
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sprintf(name, format, number);
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symbol_c *param_name = new identifier_c(name);
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return param_name;
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}
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class search_expression_type_c: public search_constant_type_c {
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private:
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search_varfb_instance_type_c *search_varfb_instance_type;
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search_base_type_c search_base_type;
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public:
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search_expression_type_c(symbol_c *search_scope) {
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search_varfb_instance_type = new search_varfb_instance_type_c(search_scope);
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}
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virtual ~search_expression_type_c(void) {
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delete search_varfb_instance_type;
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}
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/* A helper function... */
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bool is_bool_type(symbol_c *type_symbol) {
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return (typeid(*type_symbol) == typeid(bool_type_name_c));
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}
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/* A helper function... */
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bool is_time_type(symbol_c *type_symbol) {
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if (typeid(*type_symbol) == typeid(time_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(date_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(tod_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(dt_type_name_c)) {return true;}
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return false;
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}
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/* A helper function... */
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bool is_string_type(symbol_c *type_symbol) {
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if (typeid(*type_symbol) == typeid(string_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(wstring_type_name_c)) {return true;}
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return false;
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}
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/* A helper function... */
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bool is_integer_type(symbol_c *type_symbol) {
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if (typeid(*type_symbol) == typeid(sint_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(int_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(dint_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(lint_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(usint_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(uint_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(udint_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(ulint_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(constant_int_type_name_c)) {return true;}
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return false;
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}
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bool is_real_type(symbol_c *type_symbol) {
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if (typeid(*type_symbol) == typeid(real_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(lreal_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(constant_real_type_name_c)) {return true;}
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return false;
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}
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bool is_num_type(symbol_c *type_symbol) {
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return is_real_type(type_symbol) || is_integer_type(type_symbol);
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}
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bool is_nbinary_type(symbol_c *type_symbol) {
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if (typeid(*type_symbol) == typeid(byte_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(word_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(dword_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(lword_type_name_c)) {return true;}
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if (typeid(*type_symbol) == typeid(constant_int_type_name_c)) {return true;}
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return false;
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}
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bool is_binary_type(symbol_c *type_symbol) {
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if (typeid(*type_symbol) == typeid(bool_type_name_c)) {return true;}
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return is_nbinary_type(type_symbol);
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}
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bool is_same_type(symbol_c *first_type, symbol_c *second_type) {
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if (typeid(*first_type) == typeid(*second_type)) {return true;}
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if (is_integer_type(first_type) && (typeid(*second_type) == typeid(constant_int_type_name_c))) {return true;}
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if ((typeid(*first_type) == typeid(constant_int_type_name_c) && is_integer_type(second_type))) {return true;}
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if (is_binary_type(first_type) && (typeid(*second_type) == typeid(constant_int_type_name_c))) {return true;}
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if ((typeid(*first_type) == typeid(constant_int_type_name_c) && is_binary_type(second_type))) {return true;}
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if (is_real_type(first_type) && (typeid(*second_type) == typeid(constant_real_type_name_c))) {return true;}
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if ((typeid(*first_type) == typeid(constant_real_type_name_c) && is_real_type(second_type))) {return true;}
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return false;
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}
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symbol_c* common_type(symbol_c *first_type, symbol_c *second_type) {
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if (typeid(*first_type) == typeid(*second_type)) {return first_type;}
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if (is_integer_type(first_type) && (typeid(*second_type) == typeid(constant_int_type_name_c))) {return first_type;}
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if ((typeid(*first_type) == typeid(constant_int_type_name_c) && is_integer_type(second_type))) {return second_type;}
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if (is_binary_type(first_type) && (typeid(*second_type) == typeid(constant_int_type_name_c))) {return first_type;}
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if ((typeid(*first_type) == typeid(constant_int_type_name_c) && is_binary_type(second_type))) {return second_type;}
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if (is_real_type(first_type) && (typeid(*second_type) == typeid(constant_real_type_name_c))) {return first_type;}
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if ((typeid(*first_type) == typeid(constant_real_type_name_c) && is_real_type(second_type))) {return second_type;}
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return NULL;
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}
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#include "search_type_code.c"
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/*static bool_type_name_c bool_type_name;*/
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/* A helper function... */
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void *compute_boolean_expression(symbol_c *left_type, symbol_c *right_type) {
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if (!is_same_type(left_type, right_type))
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ERROR;
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if (!is_bool_type(left_type) && !is_binary_type(left_type))
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ERROR;
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if (typeid(*left_type) == typeid(constant_int_type_name_c)) {return (void *)right_type;}
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else {return (void *)left_type;}
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}
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/* A helper function... */
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void *compute_numeric_expression(symbol_c *left_type, symbol_c *right_type) {
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if (!is_same_type(left_type, right_type))
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ERROR;
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if (!is_integer_type(left_type) && !is_real_type(left_type))
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ERROR;
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if ((typeid(*left_type) == typeid(constant_int_type_name_c)) || (typeid(*left_type) == typeid(constant_real_type_name_c))) {return (void *)right_type;}
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else {return (void *)left_type;}
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return NULL;
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}
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/* a helper function... */
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symbol_c *base_type(symbol_c *symbol) {
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return (symbol_c *)symbol->accept(search_base_type);
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}
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/*********************/
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/* B 1.4 - Variables */
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/*********************/
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void *visit(symbolic_variable_c *symbol) {
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symbol_c *res;
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/* Nope, now we assume it is a variable, and determine its type... */
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res = search_varfb_instance_type->get_type(symbol);
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if (NULL != res) return res;
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return NULL;
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}
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/*************************************/
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/* B 1.4.2 - Multi-element variables */
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/*************************************/
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void *visit(array_variable_c *symbol) {
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symbol_c *res;
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/* Nope, now we assume it is a variable, and determine its type... */
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res = search_varfb_instance_type->get_type(symbol);
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if (NULL != res) return res;
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return NULL;
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}
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void *visit(structured_variable_c *symbol) {
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symbol_c *res;
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/* Nope, now we assume it is a variable, and determine its type... */
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res = search_varfb_instance_type->get_type(symbol);
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if (NULL != res) return res;
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return NULL;
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}
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/***************************************/
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/* B.3 - Language ST (Structured Text) */
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/***************************************/
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/***********************/
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/* B 3.1 - Expressions */
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/***********************/
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void *visit(or_expression_c *symbol) {
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symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
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symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
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return compute_boolean_expression(left_type, right_type);
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}
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void *visit(xor_expression_c *symbol) {
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symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
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symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
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return compute_boolean_expression(left_type, right_type);
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}
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void *visit(and_expression_c *symbol) {
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symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
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symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
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return compute_boolean_expression(left_type, right_type);
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}
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void *visit(equ_expression_c *symbol) {return (void *)&bool_type_name;}
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void *visit(notequ_expression_c *symbol) {return (void *)&bool_type_name;}
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void *visit(lt_expression_c *symbol) {return (void *)&bool_type_name;}
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void *visit(gt_expression_c *symbol) {return (void *)&bool_type_name;}
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void *visit(le_expression_c *symbol) {return (void *)&bool_type_name;}
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void *visit(ge_expression_c *symbol) {return (void *)&bool_type_name;}
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void *visit(add_expression_c *symbol) {
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symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
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symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
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if (typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&time_type_name;}
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if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&tod_type_name;}
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if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&dt_type_name;}
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return compute_numeric_expression(left_type, right_type);
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}
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void *visit(sub_expression_c *symbol) {
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symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
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symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
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if (typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&time_type_name;}
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if (typeid(*left_type) == typeid(date_type_name_c) && typeid(*right_type) == typeid(date_type_name_c)) {return (void *)&time_type_name;}
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if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&tod_type_name;}
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if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(tod_type_name_c)) {return (void *)&time_type_name;}
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if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&dt_type_name;}
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if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(dt_type_name_c)) {return (void *)&time_type_name;}
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return compute_numeric_expression(left_type, right_type);
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}
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void *visit(mul_expression_c *symbol) {
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symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
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symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
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if (typeid(*left_type) == typeid(time_type_name_c) && is_num_type(right_type)) {
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return (void *)&time_type_name;
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|
298 |
}
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|
|
299 |
return compute_numeric_expression(left_type, right_type);
|
|
|
300 |
}
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|
|
301 |
|
|
|
302 |
void *visit(div_expression_c *symbol) {
|
|
|
303 |
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
|
|
|
304 |
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
|
|
|
305 |
if (typeid(*left_type) == typeid(time_type_name_c) && is_num_type(right_type)){
|
|
|
306 |
return (void *)&time_type_name;
|
|
|
307 |
}
|
|
|
308 |
return compute_numeric_expression(left_type, right_type);
|
|
|
309 |
}
|
|
|
310 |
|
|
|
311 |
void *visit(mod_expression_c *symbol) {
|
|
|
312 |
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
|
|
|
313 |
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
|
|
|
314 |
return compute_numeric_expression(left_type, right_type);
|
|
|
315 |
}
|
|
|
316 |
|
|
|
317 |
void *visit(power_expression_c *symbol) {
|
|
|
318 |
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
|
|
|
319 |
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
|
|
|
320 |
if (is_real_type(left_type) && is_num_type(right_type)) {
|
|
|
321 |
return (void *)left_type;
|
|
|
322 |
}
|
|
|
323 |
ERROR;
|
|
|
324 |
return NULL;
|
|
|
325 |
}
|
|
|
326 |
|
|
|
327 |
void *visit(neg_expression_c *symbol) {
|
|
|
328 |
symbol_c *exp_type = base_type((symbol_c *)symbol->exp->accept(*this));
|
|
|
329 |
if (is_num_type(exp_type) || typeid(*exp_type) == typeid(time_type_name_c)){
|
|
123
|
330 |
return (void *)exp_type;
|
|
|
331 |
}
|
|
70
|
332 |
ERROR;
|
|
|
333 |
return NULL;
|
|
|
334 |
}
|
|
|
335 |
|
|
|
336 |
void *visit(not_expression_c *symbol) {
|
|
|
337 |
symbol_c *exp_type = base_type((symbol_c *)symbol->exp->accept(*this));
|
|
|
338 |
return compute_boolean_expression(exp_type, exp_type);
|
|
|
339 |
}
|
|
|
340 |
|
|
|
341 |
void *visit(function_invocation_c *symbol) {
|
|
|
342 |
function_declaration_c *f_decl = function_symtable.find_value(symbol->function_name);
|
|
|
343 |
|
|
|
344 |
if (f_decl == function_symtable.end_value()) {
|
|
149
|
345 |
void *res = compute_standard_function_default(symbol);
|
|
70
|
346 |
if (res == NULL)
|
|
|
347 |
ERROR;
|
|
|
348 |
return res;
|
|
|
349 |
}
|
|
|
350 |
|
|
|
351 |
return base_type(f_decl->type_name);
|
|
|
352 |
}
|
|
|
353 |
|
|
|
354 |
};
|
|
|
355 |
|
|
|
356 |
/*bool_type_name_c search_expression_type_c::bool_type_name;*/
|
|
|
357 |
|