--- a/stage3/visit_expression_type.cc Tue Aug 14 19:40:01 2012 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,2456 +0,0 @@
-/*
- * matiec - a compiler for the programming languages defined in IEC 61131-3
- *
- * Copyright (C) 2009-2011 Mario de Sousa (msousa@fe.up.pt)
- * Copyright (C) 2007-2011 Laurent Bessard and Edouard Tisserant
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- *
- * This code is made available on the understanding that it will not be
- * used in safety-critical situations without a full and competent review.
- */
-
-/*
- * An IEC 61131-3 compiler.
- *
- * Based on the
- * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
- *
- */
-
-
-/* Verify whether the semantic rules of data type compatibility are being followed.
- *
- * For example:
- */
-
-#include "visit_expression_type.hh"
-#include <typeinfo>
-#include <list>
-#include <string>
-#include <string.h>
-#include <strings.h>
-
-
-#define FIRST_(symbol1, symbol2) (((symbol1)->first_order < (symbol2)->first_order) ? (symbol1) : (symbol2))
-#define LAST_(symbol1, symbol2) (((symbol1)->last_order > (symbol2)->last_order) ? (symbol1) : (symbol2))
-
-#define STAGE3_ERROR(symbol1, symbol2, ...) { \
- fprintf(stderr, "%s:%d-%d..%d-%d: error : ", \
- FIRST_(symbol1,symbol2)->first_file, FIRST_(symbol1,symbol2)->first_line, FIRST_(symbol1,symbol2)->first_column, \
- LAST_(symbol1,symbol2) ->last_line, LAST_(symbol1,symbol2) ->last_column); \
- fprintf(stderr, __VA_ARGS__); \
- fprintf(stderr, "\n"); \
- il_error = true; \
- error_found = true; \
- }
-
-
-/* set to 1 to see debug info during execution */
-static int debug = 0;
-
-
-void *visit_expression_type_c::visit(program_declaration_c *symbol) {
- search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
- symbol->var_declarations->accept(*this);
- if (debug) printf("checking semantics in body of program %s\n", ((token_c *)(symbol->program_type_name))->value);
- il_parenthesis_level = 0;
- il_error = false;
- il_default_variable_type = NULL;
- symbol->function_block_body->accept(*this);
- il_default_variable_type = NULL;
- delete search_varfb_instance_type;
- search_varfb_instance_type = NULL;
- return NULL;
-}
-
-void *visit_expression_type_c::visit(function_declaration_c *symbol) {
- search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
- symbol->var_declarations_list->accept(*this);
- if (debug) printf("checking semantics in body of function %s\n", ((token_c *)(symbol->derived_function_name))->value);
- il_parenthesis_level = 0;
- il_error = false;
- il_default_variable_type = NULL;
- symbol->function_body->accept(*this);
- il_default_variable_type = NULL;
- delete search_varfb_instance_type;
- search_varfb_instance_type = NULL;
- return NULL;
-}
-
-void *visit_expression_type_c::visit(function_block_declaration_c *symbol) {
- search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
- symbol->var_declarations->accept(*this);
- if (debug) printf("checking semantics in body of FB %s\n", ((token_c *)(symbol->fblock_name))->value);
- il_parenthesis_level = 0;
- il_error = false;
- il_default_variable_type = NULL;
- symbol->fblock_body->accept(*this);
- il_default_variable_type = NULL;
- delete search_varfb_instance_type;
- search_varfb_instance_type = NULL;
- return NULL;
-}
-
-
-
-
-
-
-
-
-
-visit_expression_type_c::visit_expression_type_c(symbol_c *ignore) {
- error_found = false;
-}
-
-visit_expression_type_c::~visit_expression_type_c(void) {
-}
-
-bool visit_expression_type_c::get_error_found(void) {
- return error_found;
-}
-
-
-
-/* NOTE on data type handling and literals...
- * ==========================================
- *
- * Literals that are explicitly type cast
- * e.g.: BYTE#42
- * INT#65
- * TIME#45h23m
- * etc...
- * are NOT considered literals in the following code.
- * Since they are type cast, and their data type is fixed and well known,
- * they are treated as a variable of that data type (except when determining lvalues)
- * In other words, when calling search_constant_type_c on these constants, it returns
- * a xxxxx_type_name_c, and not one of the xxxx_literal_c !
- *
- * When the following code handles a literal, it is really a literal of unknown data type.
- * e.g. 42, may be considered an int, a byte, a word, etc...
- *
- * NOTE: type_symbol == NULL is valid!
- * This will occur, for example, when and undefined/undeclared symbolic_variable is used in the program.
- * This will not be of any type, so we always return false.
- */
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_ELEMENTARY_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- return is_ANY_MAGNITUDE_type(type_symbol)
- || is_ANY_BIT_type (type_symbol)
- || is_ANY_STRING_type (type_symbol)
- || is_ANY_DATE_type (type_symbol);
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_SAFEELEMENTARY_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- return is_ANY_SAFEMAGNITUDE_type(type_symbol)
- || is_ANY_SAFEBIT_type (type_symbol)
- || is_ANY_SAFESTRING_type (type_symbol)
- || is_ANY_SAFEDATE_type (type_symbol);
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_ELEMENTARY_compatible(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- /* NOTE: doing
- * return is_ANY_SAFEELEMENTARY_type() || is_ANY_ELEMENTARY_type()
- * is incorrect, as the literals would never be considered compatible...
- */
- return is_ANY_MAGNITUDE_compatible(type_symbol)
- || is_ANY_BIT_compatible (type_symbol)
- || is_ANY_STRING_compatible (type_symbol)
- || is_ANY_DATE_compatible (type_symbol);
-}
-
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_MAGNITUDE_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(time_type_name_c)) {return true;}
- return is_ANY_NUM_type(type_symbol);
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_SAFEMAGNITUDE_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(safetime_type_name_c)) {return true;}
- return is_ANY_SAFENUM_type(type_symbol);
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_MAGNITUDE_compatible(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (is_ANY_MAGNITUDE_type (type_symbol)) {return true;}
- if (is_ANY_SAFEMAGNITUDE_type(type_symbol)) {return true;}
-
- return is_ANY_NUM_compatible(type_symbol);
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_NUM_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (is_ANY_REAL_type(type_symbol)) {return true;}
- if (is_ANY_INT_type(type_symbol)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_SAFENUM_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- return is_ANY_SAFEREAL_type(type_symbol)
- || is_ANY_SAFEINT_type (type_symbol);
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_NUM_compatible(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (is_ANY_REAL_compatible(type_symbol)) {return true;}
- if (is_ANY_INT_compatible(type_symbol)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_DATE_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(date_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(tod_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(dt_type_name_c)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_SAFEDATE_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(safedate_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(safetod_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(safedt_type_name_c)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_DATE_compatible(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (is_ANY_DATE_type (type_symbol)) {return true;}
- if (is_ANY_SAFEDATE_type(type_symbol)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_STRING_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(string_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(wstring_type_name_c)) {return true;}
-// TODO literal_string ???
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_SAFESTRING_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(safestring_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(safewstring_type_name_c)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_STRING_compatible(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (is_ANY_STRING_type (type_symbol)) {return true;}
- if (is_ANY_SAFESTRING_type(type_symbol)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_INT_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(sint_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(int_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(dint_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(lint_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(usint_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(uint_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(udint_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(ulint_type_name_c)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_SAFEINT_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(safesint_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(safeint_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(safedint_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(safelint_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(safeusint_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(safeuint_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(safeudint_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(safeulint_type_name_c)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_INT_compatible(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (is_ANY_INT_type (type_symbol)) {return true;}
- if (is_ANY_SAFEINT_type(type_symbol)) {return true;}
- if (is_literal_integer_type(type_symbol)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_REAL_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(real_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(lreal_type_name_c)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_SAFEREAL_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(safereal_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(safelreal_type_name_c)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_REAL_compatible(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (is_ANY_REAL_type (type_symbol)) {return true;}
- if (is_ANY_SAFEREAL_type(type_symbol)) {return true;}
- if (is_literal_real_type(type_symbol)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_BIT_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(bool_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(byte_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(word_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(dword_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(lword_type_name_c)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_SAFEBIT_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(safebool_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(safebyte_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(safeword_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(safedword_type_name_c)) {return true;}
- if (typeid(*type_symbol) == typeid(safelword_type_name_c)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_BIT_compatible(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (is_ANY_BIT_type (type_symbol)) {return true;}
- if (is_ANY_SAFEBIT_type(type_symbol)) {return true;}
- if (is_nonneg_literal_integer_type(type_symbol)) {return true;}
- if (is_literal_bool_type(type_symbol)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_BOOL_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(bool_type_name_c)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_SAFEBOOL_type(symbol_c *type_symbol){
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(safebool_type_name_c)) {return true;}
- return false;
-}
-
-/* A helper function... */
-bool visit_expression_type_c::is_ANY_BOOL_compatible(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (is_BOOL_type (type_symbol)) {return true;}
- if (is_SAFEBOOL_type(type_symbol)) {return true;}
- if (is_literal_bool_type(type_symbol)) {return true;}
- return false;
-}
-
-
-#define is_type(type_name_symbol, type_name_class) ((type_name_symbol == NULL) ? false : (typeid(*type_name_symbol) == typeid(type_name_class)))
-
-
-#define sizeoftype(symbol) get_sizeof_datatype_c::getsize(symbol)
-
-
-/* A helper function... */
-bool visit_expression_type_c::is_literal_integer_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(neg_integer_c)) {return true;}
- return is_nonneg_literal_integer_type(type_symbol);
-}
-
-
-/* A helper function... */
-bool visit_expression_type_c::is_nonneg_literal_integer_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(integer_c)) {return true;}
- if (typeid(*type_symbol) == typeid(binary_integer_c)) {return true;}
- if (typeid(*type_symbol) == typeid(octal_integer_c)) {return true;}
- if (typeid(*type_symbol) == typeid(hex_integer_c)) {return true;}
- return false;
-}
-
-
-/* A helper function... */
-bool visit_expression_type_c::is_literal_real_type(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(real_c)) {return true;}
- if (typeid(*type_symbol) == typeid(neg_real_c)) {return true;}
- return false;
-}
-
-
-/* A helper function... */
-bool visit_expression_type_c::is_literal_bool_type(symbol_c *type_symbol) {
- bool_type_name_c bool_t;
-
- if (type_symbol == NULL) {return false;}
- if (typeid(*type_symbol) == typeid(boolean_true_c)) {return true;}
- if (typeid(*type_symbol) == typeid(boolean_false_c)) {return true;}
- if (is_nonneg_literal_integer_type(type_symbol))
- if (sizeoftype(&bool_t) >= sizeoftype(type_symbol)) {return true;}
- return false;
-}
-
-bool visit_expression_type_c::is_ANY_ELEMENTARY_OR_ENUMERATED_compatible(symbol_c *type_symbol) {
- if (type_symbol == NULL) {return false;}
- if (search_base_type.type_is_enumerated(type_symbol)) {return true;}
- return is_ANY_ELEMENTARY_compatible(type_symbol);
-}
-
-
-/* Determine the common data type between two data types.
- * If no common data type found, return NULL.
- *
- * If data types are identical, return the first (actually any would do...).
- * If any of the data types is a literal, we confirm that
- * the literal uses less bits than the fixed size data type.
- * e.g. BYTE and 1024 returns NULL
- * BYTE and 255 returns BYTE
- *
- * If two literals, then return the literal that requires more bits...
- */
-
-symbol_c *visit_expression_type_c::common_type__(symbol_c *first_type, symbol_c *second_type) {
- if (first_type == NULL && second_type == NULL) {return NULL;}
- if (first_type == NULL) {return second_type;}
- if (second_type == NULL) {return first_type;}
-
- if (is_literal_integer_type(first_type) && is_literal_integer_type(second_type))
- {return ((sizeoftype(first_type) > sizeoftype(second_type))? first_type:second_type);}
-
- if (is_literal_real_type(first_type) && is_literal_real_type(second_type))
- {return ((sizeoftype(first_type) > sizeoftype(second_type))? first_type:second_type);}
-
- if (is_literal_bool_type(first_type) && is_literal_bool_type(second_type))
- {return first_type;}
-
- /* The following check can only be made after the is_literal_XXXX checks */
- /* When two literals of the same type, with identical typeid's are checked,
- * we must return the one that occupies more bits... This is done above.
- */
- if (typeid(*first_type) == typeid(*second_type)) {return first_type;}
-
- /* NOTE Although a BOOL is also an ANY_BIT, we must check it explicitly since some
- * literal bool values are not literal integers...
- */
- if (is_BOOL_type(first_type) && is_literal_bool_type(second_type)) {return first_type;}
- if (is_BOOL_type(second_type) && is_literal_bool_type(first_type)) {return second_type;}
-
- if (is_SAFEBOOL_type(first_type) && is_literal_bool_type(second_type)) {return first_type;}
- if (is_SAFEBOOL_type(second_type) && is_literal_bool_type(first_type)) {return second_type;}
-
- if (is_SAFEBOOL_type(first_type) && is_BOOL_type(second_type)) {return second_type;}
- if (is_SAFEBOOL_type(second_type) && is_BOOL_type(first_type)) {return first_type;}
-
- if (is_ANY_BIT_type(first_type) && is_nonneg_literal_integer_type(second_type))
- {return ((sizeoftype(first_type) >= sizeoftype(second_type))? first_type :NULL);}
- if (is_ANY_BIT_type(second_type) && is_nonneg_literal_integer_type(first_type))
- {return ((sizeoftype(second_type) >= sizeoftype(first_type)) ? second_type:NULL);}
-
- if (is_ANY_SAFEBIT_type(first_type) && is_nonneg_literal_integer_type(second_type))
- {return ((sizeoftype(first_type) >= sizeoftype(second_type))? first_type :NULL);}
- if (is_ANY_SAFEBIT_type(second_type) && is_nonneg_literal_integer_type(first_type))
- {return ((sizeoftype(second_type) >= sizeoftype(first_type)) ? second_type:NULL);}
-
- if (is_ANY_SAFEBIT_type(first_type) && is_ANY_BIT_type(second_type))
- {return ((sizeoftype(first_type) == sizeoftype(second_type))? second_type:NULL);}
- if (is_ANY_SAFEBIT_type(second_type) && is_ANY_BIT_type(first_type))
- {return ((sizeoftype(first_type) == sizeoftype(second_type))? first_type :NULL);}
-
- if (is_ANY_INT_type(first_type) && is_literal_integer_type(second_type))
- {return ((sizeoftype(first_type) >= sizeoftype(second_type))? first_type :NULL);}
- if (is_ANY_INT_type(second_type) && is_literal_integer_type(first_type))
- {return ((sizeoftype(second_type) >= sizeoftype(first_type)) ? second_type:NULL);}
-
- if (is_ANY_SAFEINT_type(first_type) && is_literal_integer_type(second_type))
- {return ((sizeoftype(first_type) >= sizeoftype(second_type))? first_type :NULL);}
- if (is_ANY_SAFEINT_type(second_type) && is_literal_integer_type(first_type))
- {return ((sizeoftype(second_type) >= sizeoftype(first_type)) ? second_type:NULL);}
-
- if (is_ANY_SAFEINT_type(first_type) && is_ANY_INT_type(second_type))
- {return ((sizeoftype(first_type) == sizeoftype(second_type))? second_type:NULL);}
- if (is_ANY_SAFEINT_type(second_type) && is_ANY_INT_type(first_type))
- {return ((sizeoftype(first_type) == sizeoftype(second_type))? first_type :NULL);}
-
- if (is_ANY_REAL_type(first_type) && is_literal_real_type(second_type))
- {return ((sizeoftype(first_type) >= sizeoftype(second_type))? first_type :NULL);}
- if (is_ANY_REAL_type(second_type) && is_literal_real_type(first_type))
- {return ((sizeoftype(second_type) >= sizeoftype(first_type)) ? second_type:NULL);}
-
- if (is_ANY_SAFEREAL_type(first_type) && is_literal_real_type(second_type))
- {return ((sizeoftype(first_type) >= sizeoftype(second_type))? first_type :NULL);}
- if (is_ANY_SAFEREAL_type(second_type) && is_literal_real_type(first_type))
- {return ((sizeoftype(second_type) >= sizeoftype(first_type)) ? second_type:NULL);}
-
- if (is_ANY_SAFEREAL_type(first_type) && is_ANY_REAL_type(second_type))
- {return ((sizeoftype(first_type) == sizeoftype(second_type))? second_type:NULL);}
- if (is_ANY_SAFEREAL_type(second_type) && is_ANY_REAL_type(first_type))
- {return ((sizeoftype(first_type) == sizeoftype(second_type))? first_type :NULL);}
-
- /* the Time and Date types... */
- if (is_type(first_type, safetime_type_name_c) && is_type(second_type, time_type_name_c)) {return second_type;}
- if (is_type(second_type, safetime_type_name_c) && is_type( first_type, time_type_name_c)) {return first_type;}
-
- if (is_type(first_type, safedate_type_name_c) && is_type(second_type, date_type_name_c)) {return second_type;}
- if (is_type(second_type, safedate_type_name_c) && is_type( first_type, date_type_name_c)) {return first_type;}
-
- if (is_type(first_type, safedt_type_name_c) && is_type(second_type, dt_type_name_c)) {return second_type;}
- if (is_type(second_type, safedt_type_name_c) && is_type( first_type, dt_type_name_c)) {return first_type;}
-
- if (is_type(first_type, safetod_type_name_c) && is_type(second_type, tod_type_name_c)) {return second_type;}
- if (is_type(second_type, safetod_type_name_c) && is_type( first_type, tod_type_name_c)) {return first_type;}
-
- /* no common type */
- return NULL;
-}
-
-/* Determine the common data type between two data types.
- * Unlike the common_type__() function, we stop the compiler with an ERROR
- * if no common data type is found.
- */
-symbol_c *visit_expression_type_c::common_type(symbol_c *first_type, symbol_c *second_type) {
-/*
- symbol_c *res = common_type__(first_type, second_type);
- if (NULL == res) ERROR;
- return res;
-*/
- return common_type__(first_type, second_type);
-}
-
-symbol_c *visit_expression_type_c::common_literal(symbol_c *first_type, symbol_c *second_type) {
- printf("common_literal: %d == %d, %d == %d, %d == %d\n",
- (int)is_ANY_INT_compatible(first_type),
- (int)is_ANY_INT_compatible(second_type),
- (int)is_ANY_REAL_compatible(first_type),
- (int)is_ANY_REAL_compatible(second_type),
- (int)is_ANY_BIT_compatible(first_type),
- (int)is_ANY_BIT_compatible(second_type));
- if ((is_ANY_INT_compatible(first_type) && is_ANY_INT_compatible(second_type)) ||
- (is_ANY_BIT_compatible(first_type) && is_ANY_BIT_compatible(second_type)))
- return &search_constant_type_c::integer;
- else if (is_ANY_REAL_compatible(first_type) && is_ANY_REAL_compatible(second_type))
- return &search_constant_type_c::real;
- return NULL;
-}
-
-symbol_c *visit_expression_type_c::overloaded_return_type(symbol_c *type) {
- if (is_ANY_INT_compatible(type))
- return &search_constant_type_c::ulint_type_name;
- else if (is_ANY_REAL_compatible(type))
- return &search_constant_type_c::lreal_type_name;
- else if (is_ANY_BIT_compatible(type))
- return &search_constant_type_c::lword_type_name;
- return NULL;
-}
-
-/* Return TRUE if the second (value) data type may be assigned to a variable of the first (variable) data type
- * such as:
- * var_type value_type
- * BOOL BYTE#7 -> returns false
- * INT INT#7 -> returns true
- * INT 7 -> returns true
- * REAL 7.89 -> returns true
- * REAL 7 -> returns true
- * INT 7.89 -> returns false
- * SAFEBOOL BOOL#1 -> returns false !!!
- * etc...
- *
- * NOTE: It is assumed that the var_type is the data type of an lvalue
- */
-bool visit_expression_type_c::is_valid_assignment(symbol_c *var_type, symbol_c *value_type) {
- if (var_type == NULL) {/* STAGE3_ERROR(value_type, value_type, "Var_type == NULL"); */ return false;}
- if (value_type == NULL) {/* STAGE3_ERROR(var_type, var_type, "Value_type == NULL"); */ return false;}
-
- symbol_c *common_type = common_type__(var_type, value_type);
- if (NULL == common_type)
- return false;
- return (typeid(*var_type) == typeid(*common_type));
-}
-
-
-/* Return TRUE if there is a common data type, otherwise return FALSE
- * i.e., return TRUE if both data types may be used simultaneously in an expression
- * such as:
- * BOOL#0 AND BYTE#7 -> returns false
- * 0 AND BYTE#7 -> returns true
- * INT#10 AND INT#7 -> returns true
- * INT#10 AND 7 -> returns true
- * REAL#34.3 AND 7.89 -> returns true
- * REAL#34.3 AND 7 -> returns true
- * INT#10 AND 7.89 -> returns false
- * SAFEBOOL#0 AND BOOL#1 -> returns true !!!
- * etc...
- */
-bool visit_expression_type_c::is_compatible_type(symbol_c *first_type, symbol_c *second_type) {
- if (first_type == NULL || second_type == NULL) {return false;}
- return (NULL != common_type__(first_type, second_type));
-}
-
-
-
-
-/* A helper function... */
-/*
-symbol_c *visit_expression_type_c::compute_boolean_expression(symbol_c *left_type, symbol_c *right_type,
- is_data_type_t is_data_type) {
-*/
-symbol_c *visit_expression_type_c::compute_expression(symbol_c *left_type, symbol_c *right_type, is_data_type_t is_data_type,
- symbol_c *left_expr, symbol_c *right_expr) {
- bool error = false;
-
- if (!(this->*is_data_type)(left_type)) {
- if (debug) printf("visit_expression_type_c::compute_expression(): invalid left_type\n");
- if (left_expr != NULL)
- STAGE3_ERROR(left_expr, left_expr, "Invalid data type of operand, or of data resulting from previous IL instructions.");
- error = true;
- }
- if (!(this->*is_data_type)(right_type)) {
- if (debug) printf("visit_expression_type_c::compute_expression(): invalid right_type\n");
- if (right_expr != NULL)
- STAGE3_ERROR(right_expr, right_expr, "Invalid data type of operand.");
- error = true;
- }
- if (!is_compatible_type(left_type, right_type)) {
- if (debug) printf("visit_expression_type_c::compute_expression(): left_type & right_type are incompatible\n");
- if ((left_expr != NULL) && (right_expr != NULL))
- STAGE3_ERROR(left_expr, right_expr, "Type mismatch between operands.");
- error = true;
- }
-
- if (error)
- return NULL;
- else
- return common_type(left_type, right_type);
-}
-
-
-
-
-/* A helper function... */
-/* check the semantics of a FB or Function non-formal call */
-/* e.g. foo(1, 2, 3, 4); */
-/* If error_count pointer is != NULL, we do not really print out the errors,
- * but rather only count how many errors were found.
- * This is used to support overloaded functions, where we have to check each possible
- * function, one at a time, untill we find a function call without any errors.
- */
-void visit_expression_type_c::check_nonformal_call(symbol_c *f_call, symbol_c *f_decl, bool use_il_defvar, int *error_count) {
- symbol_c *call_param_value, *call_param_type, *param_type;
- identifier_c *param_name;
- function_param_iterator_c fp_iterator(f_decl);
- function_call_param_iterator_c fcp_iterator(f_call);
- int extensible_parameter_highest_index = -1;
-
- /* reset error counter */
- if (error_count != NULL) *error_count = 0;
- /* if use_il_defvar, then the first parameter for the call comes from the il_default_variable */
- if (use_il_defvar) {
- /* The first parameter of the function corresponds to the il_default_variable_type of the function call */
- do {
- param_name = fp_iterator.next();
- if(param_name == NULL) break;
- /* The EN and ENO parameters are default parameters.
- * In the non-formal invocation of a function there can be no assignment of
- * values to these parameters. Therefore, we ignore the parameters declared
- * in the function.
- */
- } while ((strcmp(param_name->value, "EN") == 0) || (strcmp(param_name->value, "ENO") == 0));
- /* If the function does not have any parameters (param_name == NULL)
- * then we cannot compare its type with the il_default_variable_type.
- *
- * However, I (Mario) think this is invalid syntax, as it seems to me all functions must
- * have at least one parameter.
- * However, we will make this semantic verification consider it possible, as later
- * versions of the standard may change that syntax.
- * So, instead of generating a syntax error message, we simply check whether the call
- * is passing any more parameters besides the default variable (the il default variable may be ignored
- * in this case, and not consider it as being a parameter being passed to the function).
- * If it does, then we have found a semantic error, otherwise the function call is
- * correct, and we simply return.
- */
- if(param_name == NULL) {
- if (fcp_iterator.next_nf() != NULL)
- STAGE3_ERROR(f_call, f_call, "Too many parameters in function/FB call.");
- return;
- } else {
- /* param_name != NULL */
- param_type = fp_iterator.param_type();
- if(!is_valid_assignment(param_type, il_default_variable_type)) {
- if (error_count != NULL) (*error_count)++;
- else STAGE3_ERROR(f_call, f_call, "In function/FB call, first parameter has invalid data type.");
- }
- }
-
- /* the fisrt parameter (il_def_variable) is correct */
- if (extensible_parameter_highest_index < fp_iterator.extensible_param_index()) {
- extensible_parameter_highest_index = fp_iterator.extensible_param_index();
- }
- } // if (use_il_defvar)
-
-
-
- /* Iterating through the non-formal parameters of the function call */
- while((call_param_value = fcp_iterator.next_nf()) != NULL) {
- /* Obtaining the type of the value being passed in the function call */
- call_param_type = base_type((symbol_c*)call_param_value->accept(*this));
- if (call_param_type == NULL) {
- if (error_count != NULL) (*error_count)++;
- /* the following error will usually occur when ST code uses an identifier, that could refer to an enumerated constant,
- * but was not actually used as a constant in any definitions of an enumerated data type
- */
- else STAGE3_ERROR(call_param_value, call_param_value, "Could not determine data type of value being passed in function/FB call.");
- continue;
- }
-
- /* Iterate to the next parameter of the function being called.
- * Get the name of that parameter, and ignore if EN or ENO.
- */
- do {
- param_name = fp_iterator.next();
- /* If there is no other parameter declared, then we are passing too many parameters... */
- if(param_name == NULL) {
- if (error_count != NULL) (*error_count)++;
- /* Note: We don't want to print out the follwoing error message multiple times, so we return instead of continuing with 'break' */
- else STAGE3_ERROR(f_call, f_call, "Too many parameters in function/FB call."); return;
- }
- } while ((strcmp(param_name->value, "EN") == 0) || (strcmp(param_name->value, "ENO") == 0));
-
- /* Get the parameter type */
- param_type = base_type(fp_iterator.param_type());
- /* If the declared parameter and the parameter from the function call do not have the same type */
- if(!is_valid_assignment(param_type, call_param_type)) {
- if (error_count != NULL) (*error_count)++;
- else STAGE3_ERROR(call_param_value, call_param_value, "Type mismatch in function/FB call parameter.");
- }
-
- if (extensible_parameter_highest_index < fp_iterator.extensible_param_index()) {
- extensible_parameter_highest_index = fp_iterator.extensible_param_index();
- }
- }
-
- /* The function call may not have any errors! */
- /* In the case of a call to an extensible function, we store the highest index
- * of the extensible parameters this particular call uses, in the symbol_c object
- * of the function call itself!
- * In calls to non-extensible functions, this value will be set to -1.
- * This information is later used in stage4 to correctly generate the
- * output code.
- */
- int extensible_param_count = -1;
- if (extensible_parameter_highest_index >=0) /* if call to extensible function */
- extensible_param_count = 1 + extensible_parameter_highest_index - fp_iterator.first_extensible_param_index();
- il_function_call_c *il_function_call = dynamic_cast<il_function_call_c *>(f_call);
- function_invocation_c *function_invocation = dynamic_cast<function_invocation_c *>(f_call);
- if (il_function_call != NULL) il_function_call ->extensible_param_count = extensible_param_count;
- else if (function_invocation != NULL) function_invocation->extensible_param_count = extensible_param_count;
- // else ERROR; /* this function is also called by Function Blocks, so this is not an error! */
-}
-
-
-/* check semantics of FB call in the IL language using input operators */
-/* e.g. CU, CLK, IN, PT, SR, ... */
-void visit_expression_type_c::check_il_fbcall(symbol_c *il_operator, const char *il_operator_str) {
- symbol_c *call_param_type = il_default_variable_type;
- symbol_c *fb_decl = il_operand_type;
- /* The following should never occur. The function block must be defined,
- * and the FB type being called MUST be in the symtable...
- * This was all already checked at stage 2!
- */
- if (NULL == fb_decl) ERROR;
- if (call_param_type == NULL) ERROR;
-
- /* We also create an identifier_c object, so we can later use it to find the equivalent FB parameter */
- /* Note however that this symbol does not have the correct location (file name and line numbers)
- * so any error messages must use the il_operator symbol to generate the error location
- */
- identifier_c call_param_name(il_operator_str);
-
- /* Obtaining the type of the value being passed in the function call */
- call_param_type = base_type(call_param_type);
- if (call_param_type == NULL) STAGE3_ERROR(il_operator, il_operator, "Could not determine data type of value being passed in FB call.");
-
- /* Find the corresponding parameter of the function being called */
- function_param_iterator_c fp_iterator(fb_decl);
- if(fp_iterator.search(&call_param_name) == NULL) {
- STAGE3_ERROR(il_operand, il_operand, "Called FB does not have an input parameter named %s.", il_operator_str);
- } else {
- /* Get the parameter type */
- symbol_c *param_type = base_type(fp_iterator.param_type());
- /* If the declared parameter and the parameter from the function call have the same type */
- if(!is_valid_assignment(param_type, call_param_type)) STAGE3_ERROR(il_operator, il_operator, "Type mismatch in FB call parameter.");
- }
-}
-
-
-/* A helper function... */
-/* check the semantics of a FB or Function formal call */
-/* e.g. foo(IN1 := 1, OUT1 =>x, EN := true); */
-/* If error_count pointer is != NULL, we do not really print out the errors,
- * but rather only count how many errors were found.
- * This is used to support overloaded functions, where we have to check each possible
- * function, one at a time, untill we find a function call without any errors.
- */
-void visit_expression_type_c::check_formal_call(symbol_c *f_call, symbol_c *f_decl, int *error_count) {
- symbol_c *call_param_value, *call_param_type, *call_param_name, *param_type;
- symbol_c *verify_duplicate_param;
- identifier_c *param_name;
- function_param_iterator_c fp_iterator(f_decl);
- function_call_param_iterator_c fcp_iterator(f_call);
- int extensible_parameter_highest_index = -1;
- identifier_c *extensible_parameter_name;
-
- /* reset error counter */
- if (error_count != NULL) *error_count = 0;
-
- /* Iterating through the formal parameters of the function call */
- while((call_param_name = fcp_iterator.next_f()) != NULL) {
-
- /* Obtaining the value being passed in the function call */
- call_param_value = fcp_iterator.get_current_value();
- /* the following should never occur. If it does, then we have a bug in our code... */
- if (NULL == call_param_value) ERROR;
-
- /* Checking if there are duplicated parameter values */
- verify_duplicate_param = fcp_iterator.search_f(call_param_name);
- if(verify_duplicate_param != call_param_value){
- if (error_count != NULL) (*error_count)++;
- else STAGE3_ERROR(call_param_name, verify_duplicate_param, "Duplicated parameter values.");
- }
-
- /* Obtaining the type of the value being passed in the function call */
- call_param_type = (symbol_c*)call_param_value->accept(*this);
- if (call_param_type == NULL) {
- if (error_count != NULL) (*error_count)++;
- else STAGE3_ERROR(call_param_name, call_param_value, "Could not determine data type of value being passed in function/FB call.");
- /* The data value being passed is possibly any enumerated type value.
- * We do not yet handle semantic verification of enumerated types.
- */
- ERROR;
- }
- call_param_type = base_type(call_param_type);
- if (call_param_type == NULL) STAGE3_ERROR(call_param_name, call_param_value, "Could not determine data type of value being passed in function/FB call.");
-
- /* Find the corresponding parameter of the function being called */
- param_name = fp_iterator.search(call_param_name);
- if(param_name == NULL) {
- if (error_count != NULL) (*error_count)++;
- else STAGE3_ERROR(call_param_name, call_param_name, "Invalid parameter in function/FB call.");
- } else {
- /* Get the parameter type */
- param_type = base_type(fp_iterator.param_type());
- /* If the declared parameter and the parameter from the function call have the same type */
- if(!is_valid_assignment(param_type, call_param_type)) {
- if (error_count != NULL) (*error_count)++;
- else STAGE3_ERROR(call_param_name, call_param_value, "Type mismatch function/FB call parameter.");
- }
- if (extensible_parameter_highest_index < fp_iterator.extensible_param_index()) {
- extensible_parameter_highest_index = fp_iterator.extensible_param_index();
- extensible_parameter_name = param_name;
- }
- }
- }
-
- /* In the case of a call to an extensible function, we store the highest index
- * of the extensible parameters this particular call uses, in the symbol_c object
- * of the function call itself!
- * In calls to non-extensible functions, this value will be set to -1.
- * This information is later used in stage4 to correctly generate the
- * output code.
- */
- int extensible_param_count = -1;
- if (extensible_parameter_highest_index >=0) /* if call to extensible function */
- extensible_param_count = 1 + extensible_parameter_highest_index - fp_iterator.first_extensible_param_index();
- il_formal_funct_call_c *il_formal_funct_call = dynamic_cast<il_formal_funct_call_c *>(f_call);
- function_invocation_c *function_invocation = dynamic_cast<function_invocation_c *>(f_call);
- if (il_formal_funct_call != NULL) il_formal_funct_call->extensible_param_count = extensible_param_count;
- else if (function_invocation != NULL) function_invocation->extensible_param_count = extensible_param_count;
-// else ERROR; /* this function is also called by Function Blocks, so this is not an error! */
-
- /* We have iterated through all the formal parameters of the function call,
- * and everything seems fine.
- * If the function being called in an extensible function, we now check
- * whether the extensible paramters in the formal invocation do not skip
- * any indexes...
- *
- * f(in1:=0, in2:=0, in4:=0) --> ERROR!!
- */
- if (extensible_parameter_highest_index >=0) { /* if call to extensible function */
- for (int i=fp_iterator.first_extensible_param_index(); i < extensible_parameter_highest_index; i++) {
- char tmp[256];
- if (snprintf(tmp, 256, "%s%d", extensible_parameter_name->value, i) >= 256) ERROR;
- if (fcp_iterator.search_f(tmp) == NULL) {
- /* error in invocation of extensible function */
- if (error_count != NULL) (*error_count)++;
- else STAGE3_ERROR(f_call, f_call, "Missing extensible parameters in call to extensible function.");
- }
- }
- }
-}
-
-
-
-
-/* a helper function... */
-symbol_c *visit_expression_type_c::base_type(symbol_c *symbol) {
- /* NOTE: symbol == NULL is valid. It will occur when, for e.g., an undefined/undeclared symbolic_variable is used
- * in the code.
- */
- if (symbol == NULL) return NULL;
- return (symbol_c *)symbol->accept(search_base_type);
-}
-
-
-/* a helper function... */
-void *visit_expression_type_c::verify_null(symbol_c *symbol){
- if(il_default_variable_type == NULL){
- STAGE3_ERROR(symbol, symbol, "Missing LD instruction (or equivalent) before this instruction.");
- }
- if(il_operand_type == NULL){
- STAGE3_ERROR(symbol, symbol, "This instruction requires an operand.");
- }
- return NULL;
-}
-
-
-/********************************/
-/* B 1.3.3 - Derived data types */
-/********************************/
-void *visit_expression_type_c::visit(data_type_declaration_c *symbol) {
- // TODO !!!
- /* for the moment we must return NULL so semantic analysis of remaining code is not interrupted! */
- return NULL;
-}
-
-
-/*********************/
-/* B 1.4 - Variables */
-/*********************/
-
-void *visit_expression_type_c::visit(symbolic_variable_c *symbol) {
- return search_varfb_instance_type->get_basetype_decl(symbol);
-}
-
-/********************************************/
-/* B 1.4.1 - Directly Represented Variables */
-/********************************************/
-void *visit_expression_type_c::visit(direct_variable_c *symbol) {
- switch (symbol->value[2]) {
- case 'X': // bit - 1 bit
- return (void *)&bool_type_name;
- case 'B': // byte - 8 bits
- return (void *)&byte_type_name;
- case 'W': // word - 16 bits
- return (void *)&word_type_name;
- case 'D': // double word - 32 bits
- return (void *)&dword_type_name;
- case 'L': // long word - 64 bits
- return (void *)&lword_type_name;
- default: // if none of the above, then the empty string was used <=> boolean
- return (void *)&bool_type_name;
- }
-}
-
-/*************************************/
-/* B 1.4.2 - Multi-element variables */
-/*************************************/
-void *visit_expression_type_c::visit(array_variable_c *symbol) {
- return search_varfb_instance_type->get_basetype_decl(symbol);
-}
-
-void *visit_expression_type_c::visit(structured_variable_c *symbol) {
- return search_varfb_instance_type->get_basetype_decl(symbol);
-}
-
-
-
-/********************************/
-/* B 1.7 Configuration elements */
-/********************************/
-void *visit_expression_type_c::visit(configuration_declaration_c *symbol) {
- // TODO !!!
- /* for the moment we must return NULL so semantic analysis of remaining code is not interrupted! */
- return NULL;
-}
-
-
-/****************************************/
-/* B.2 - Language IL (Instruction List) */
-/****************************************/
-/***********************************/
-/* B 2.1 Instructions and Operands */
-/***********************************/
-/*| instruction_list il_instruction */
-/* The visitor of the base class search_visitor_c will handle calling each instruction in the list.
- * We do not need to do anything here...
- */
-// void *visit_expression_type_c::visit(instruction_list_c *symbol)
-
-/* | label ':' [il_incomplete_instruction] eol_list */
-//SYM_REF2(il_instruction_c, label, il_instruction)
-// void *visit_expression_type_c::visit(il_instruction_c *symbol);
-
-
-/* | il_simple_operator [il_operand] */
-// SYM_REF2(il_simple_operation_c, il_simple_operator, il_operand)
-void *visit_expression_type_c::visit(il_simple_operation_c *symbol) {
- if (il_error)
- return NULL;
-
- /* determine the data type of the operand */
- il_operand = symbol->il_operand;
- if (symbol->il_operand != NULL){
- il_operand_type = base_type((symbol_c *)symbol->il_operand->accept(*this));
- } else {
- il_operand_type = NULL;
- }
- /* recursive call to see whether data types are compatible */
- symbol->il_simple_operator->accept(*this);
-
- il_operand_type = NULL;
- il_operand = NULL;
- return NULL;
-}
-
-// | function_name [il_operand_list] */
-//SYM_REF2(il_function_call_c, function_name, il_operand_list)
-void *visit_expression_type_c::visit(il_function_call_c *symbol) {
- if (il_error)
- return NULL;
-
- symbol_c *return_data_type = NULL;
- symbol_c* fdecl_return_type;
- symbol_c* overloaded_data_type = NULL;
- int extensible_param_count = -1;
- symbol->called_function_declaration = NULL;
-
- /* First find the declaration of the function being called! */
- function_symtable_t::iterator lower = function_symtable.lower_bound(symbol->function_name);
- function_symtable_t::iterator upper = function_symtable.upper_bound(symbol->function_name);
- function_symtable_t::iterator current;
- if (lower == function_symtable.end()) ERROR;
-
- int error_count = 0;
- int *error_count_ptr = NULL;
-
- function_symtable_t::iterator second = lower;
- second++;
- if (second != upper)
- /* This is a call to an overloaded function... */
- error_count_ptr = &error_count;
-
- for(current = lower; current != upper; current++) {
- function_declaration_c *f_decl = function_symtable.get_value(current);
-
- check_nonformal_call(symbol, f_decl, true, error_count_ptr);
-
- if (0 == error_count) {
- /* Either:
- * (i) we have a call to a non-overloaded function (error_cnt_ptr is NULL!, so error_count won't change!)
- * (ii) we have a call to an overloaded function, with no errors!
- */
-
- fdecl_return_type = base_type(f_decl->type_name);
-
- if (symbol->called_function_declaration == NULL) {
- /* Store the pointer to the declaration of the function being called.
- * This data will be used by stage 4 to call the correct function.
- * Mostly needed to disambiguate overloaded functions...
- * See comments in absyntax.def for more details
- */
- symbol->called_function_declaration = f_decl;
- extensible_param_count = symbol->extensible_param_count;
-
- /* determine the base data type returned by the function being called... */
- return_data_type = fdecl_return_type;
- }
- else if (typeid(*return_data_type) != typeid(*fdecl_return_type)){
- return_data_type = common_literal(return_data_type, fdecl_return_type);
- overloaded_data_type = overloaded_return_type(return_data_type);
- }
-
- if (NULL == return_data_type) ERROR;
- }
- }
-
- if (overloaded_data_type != NULL) {
- for(current = lower; current != upper; current++) {
- function_declaration_c *f_decl = function_symtable.get_value(current);
-
- /* check semantics of data passed in the function call... */
- check_nonformal_call(symbol, f_decl, true, error_count_ptr);
-
- if (0 == error_count) {
-
- fdecl_return_type = base_type(f_decl->type_name);
-
- if (typeid(*overloaded_data_type) == typeid(*fdecl_return_type)){
- /* Store the pointer to the declaration of the function being called.
- * This data will be used by stage 4 to call the correct function.
- * Mostly needed to disambiguate overloaded functions...
- * See comments in absyntax.def for more details
- */
- symbol->called_function_declaration = f_decl;
- extensible_param_count = symbol->extensible_param_count;
- }
- }
- }
- }
-
- if (NULL == return_data_type) {
- /* No compatible function was found for this function call */
- STAGE3_ERROR(symbol, symbol, "Call to an overloaded function with invalid parameter type.");
- }
- else {
- symbol->extensible_param_count = extensible_param_count;
- /* set the new data type of the default variable for the following verifications... */
- il_default_variable_type = return_data_type;
- }
-
- return NULL;
-}
-
-
-/* | il_expr_operator '(' [il_operand] eol_list [simple_instr_list] ')' */
-// SYM_REF3(il_expression_c, il_expr_operator, il_operand, simple_instr_list);
-void *visit_expression_type_c::visit(il_expression_c *symbol) {
- if (il_error)
- return NULL;
-
- symbol_c *il_default_variable_type_back = il_default_variable_type;
-
- il_parenthesis_level++;
-
- if(symbol->il_operand != NULL) {
- il_default_variable_type = base_type((symbol_c *)symbol->il_operand->accept(*this));
- } else {
- il_default_variable_type = NULL;
- }
-
- if(symbol->simple_instr_list != NULL) {
- symbol->simple_instr_list->accept(*this);
- }
-
- il_parenthesis_level--;
- if (il_parenthesis_level < 0) ERROR;
-
- il_operand = symbol->simple_instr_list;
- il_operand_type = il_default_variable_type;
- il_default_variable_type = il_default_variable_type_back;
-
- /* Now check the if the data type semantics of operation are correct,
- * but only if no previous error has been found...
- */
- if (!il_error)
- symbol->il_expr_operator->accept(*this);
-
- il_operand_type = NULL;
- il_operand = NULL;
- return NULL;
-}
-
-
-#if 0
-/* il_jump_operator label */
-SYM_REF2(il_jump_operation_c, il_jump_operator, label)
-void *visit_expression_type_c::visit(il_jump_operation_c *symbol);
-#endif
-
-
-/* il_call_operator prev_declared_fb_name
- * | il_call_operator prev_declared_fb_name '(' ')'
- * | il_call_operator prev_declared_fb_name '(' eol_list ')'
- * | il_call_operator prev_declared_fb_name '(' il_operand_list ')'
- * | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')'
- */
-/* SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list) */
-void *visit_expression_type_c::visit(il_fb_call_c *symbol) {
- if (il_error)
- return NULL;
-
- /* first check whether the il_default_variable is of the correct type
- * for the CAL / CALC / CALCN operator being used...
- */
- symbol->il_call_operator->accept(*this);
-
- /* Now check the FB call itself... */
-
- /* First we find the declaration of the FB type of the FB instance being called... */
- /* e.g. Function_block foo_fb_type
- * ...
- * End_Function_Block
- *
- * Program test
- * var fb1 : foo_fb_type; end_var
- * fb1(...)
- * End_Program
- *
- * search_varfb_instance_type->get_basetype_decl( identifier_c("fb1") )
- * in the scope of Program 'test'
- * will return the fb declaration of foo_fb_type !!
- */
-#if 0
- symbol_c *fb_decl_symbol = search_varfb_instance_type->get_basetype_decl(symbol->fb_name);
- /* The following should never occur. The function block must be defined,
- * and the FB type being called MUST be in the symtable...
- * This was all already checked at stage 2!
- */
- if (NULL == fb_decl_symbol) ERROR;
-
- function_block_declaration_c *fb_decl = dynamic_cast<function_block_declaration_c *>(fb_decl_symbol);
- /* should never occur. ... */
- if (NULL == fb_decl) ERROR;
-#endif
- symbol_c *fb_decl = search_varfb_instance_type->get_basetype_decl(symbol->fb_name);
- /* The following should never occur. The function block must be defined,
- * and the FB type being called MUST be in the symtable...
- * This was all already checked at stage 2!
- */
- if (NULL == fb_decl) ERROR;
-
- /* now check the semantics of the fb call... */
- /* If the syntax parser is working correctly, exactly one of the
- * following two symbols will be NULL, while the other is != NULL.
- */
- if (NULL != symbol->il_operand_list) check_nonformal_call(symbol, fb_decl);
- if (NULL != symbol->il_param_list) check_formal_call (symbol, fb_decl);
-
- return NULL;
-}
-
-
-
-/* | function_name '(' eol_list [il_param_list] ')' */
-/* SYM_REF2(il_formal_funct_call_c, function_name, il_param_list) */
-void *visit_expression_type_c::visit(il_formal_funct_call_c *symbol) {
- if (il_error)
- return NULL;
-
- symbol_c *return_data_type = NULL;
- symbol_c* fdecl_return_type;
- symbol_c *overloaded_data_type = NULL;
- int extensible_param_count = -1;
- symbol->called_function_declaration = NULL;
-
- function_symtable_t::iterator lower = function_symtable.lower_bound(symbol->function_name);
- function_symtable_t::iterator upper = function_symtable.upper_bound(symbol->function_name);
- function_symtable_t::iterator current;
-
- if (lower == function_symtable.end()) {
- function_type_t current_function_type = get_function_type((identifier_c *)symbol->function_name);
- if (current_function_type == function_none) ERROR;
- return NULL;
- }
-
- int error_count = 0;
- int *error_count_ptr = NULL;
-
- function_symtable_t::iterator second = lower;
- second++;
- if (second != upper)
- /* This is a call to an overloaded function... */
- error_count_ptr = &error_count;
-
- for(current = lower; current != upper; current++) {
- function_declaration_c *f_decl = function_symtable.get_value(current);
-
- /* check semantics of data passed in the function call... */
- check_formal_call(symbol, f_decl, error_count_ptr);
-
- if (0 == error_count) {
- /* Either:
- * (i) we have a call to a non-overloaded function (error_cnt_ptr is NULL!, so error_count won't change!)
- * (ii) we have a call to an overloaded function, with no errors!
- */
-
- fdecl_return_type = base_type(f_decl->type_name);
-
- if (symbol->called_function_declaration == NULL) {
- /* Store the pointer to the declaration of the function being called.
- * This data will be used by stage 4 to call the correct function.
- * Mostly needed to disambiguate overloaded functions...
- * See comments in absyntax.def for more details
- */
- symbol->called_function_declaration = f_decl;
- extensible_param_count = symbol->extensible_param_count;
-
- /* determine the base data type returned by the function being called... */
- return_data_type = fdecl_return_type;
- }
- else if (typeid(*return_data_type) != typeid(*fdecl_return_type)){
- return_data_type = common_literal(return_data_type, fdecl_return_type);
- overloaded_data_type = overloaded_return_type(return_data_type);
- }
-
- /* the following should never occur. If it does, then we have a bug in the syntax parser (stage 2)... */
- if (NULL == return_data_type) ERROR;
-
- }
- }
-
- if (overloaded_data_type != NULL) {
- for(current = lower; current != upper; current++) {
- function_declaration_c *f_decl = function_symtable.get_value(current);
-
- /* check semantics of data passed in the function call... */
- check_formal_call(symbol, f_decl, error_count_ptr);
-
- if (0 == error_count) {
-
- fdecl_return_type = base_type(f_decl->type_name);
-
- if (typeid(*overloaded_data_type) == typeid(*fdecl_return_type)){
- /* Store the pointer to the declaration of the function being called.
- * This data will be used by stage 4 to call the correct function.
- * Mostly needed to disambiguate overloaded functions...
- * See comments in absyntax.def for more details
- */
- symbol->called_function_declaration = f_decl;
- extensible_param_count = symbol->extensible_param_count;
- }
- }
- }
- }
-
- if (NULL == return_data_type) {
- /* No compatible function was found for this function call */
- STAGE3_ERROR(symbol, symbol, "Call to an overloaded function with invalid parameter type.");
- }
- else {
- symbol->extensible_param_count = extensible_param_count;
- /* the data type of the data returned by the function, and stored in the il default variable... */
- il_default_variable_type = return_data_type;
- }
-
- return NULL;
-}
-
-
-#if 0
-/* | il_operand_list ',' il_operand */
-SYM_LIST(il_operand_list_c)
-void *visit_expression_type_c::visit(il_operand_list_c *symbol);
-
-/* | simple_instr_list il_simple_instruction */
-SYM_LIST(simple_instr_list_c)
-void *visit_expression_type_c::visit(simple_instr_list_c *symbol);
-
-/* | il_initial_param_list il_param_instruction */
-SYM_LIST(il_param_list_c)
-void *visit_expression_type_c::visit(il_param_list_c *symbol);
-
-/* il_assign_operator il_operand
- * | il_assign_operator '(' eol_list simple_instr_list ')'
- */
-SYM_REF3(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list)
-void *visit_expression_type_c::visit(il_param_assignment_c *symbol);
-/* il_assign_out_operator variable */
-SYM_REF2(il_param_out_assignment_c, il_assign_out_operator, variable)
-void *visit_expression_type_c::visit(il_param_out_assignment_c *symbol);
-
-#endif
-
-
-/*******************/
-/* B 2.2 Operators */
-/*******************/
-
-//SYM_REF0(LD_operator_c)
-void *visit_expression_type_c::visit(LD_operator_c *symbol) {
- if (0 == il_parenthesis_level)
- il_error = false;
-
- if(il_operand_type == NULL)
- STAGE3_ERROR(symbol, symbol, "LD operator requires an operand.");
- il_default_variable_type = il_operand_type;
- return NULL;
-}
-
-// SYM_REF0(LDN_operator_c)
-void *visit_expression_type_c::visit(LDN_operator_c *symbol) {
- if(il_operand_type == NULL)
- STAGE3_ERROR(symbol, symbol, "LDN operator requires an operand.");
- if(!is_ANY_BIT_compatible(il_operand_type))
- STAGE3_ERROR(symbol, il_operand, "invalid data type of LDN operand, should be of type ANY_BIT.");
- il_default_variable_type = il_operand_type;
- return NULL;
-}
-
-// SYM_REF0(ST_operator_c)
-void *visit_expression_type_c::visit(ST_operator_c *symbol) {
- verify_null(symbol);
-
- if(!is_valid_assignment(il_operand_type, il_default_variable_type))
- STAGE3_ERROR(symbol, symbol, "Type mismatch in ST operation.");
- /* TODO: check whether il_operand_type is an LVALUE !! */
- /* data type of il_default_variable_type is unchanged... */
- // il_default_variable_type = il_default_variable_type;
- return NULL;
-}
-
-// SYM_REF0(STN_operator_c)
- void *visit_expression_type_c::visit(STN_operator_c *symbol) {
- verify_null(symbol);
- if(!is_valid_assignment(il_operand_type, il_default_variable_type))
- STAGE3_ERROR(symbol, symbol, "Type mismatch in ST operation.");
- /* TODO: check whether il_operand_type is an LVALUE !! */
- if(!is_ANY_BIT_compatible(il_default_variable_type))
- STAGE3_ERROR(symbol, symbol, "invalid data type of il_default_variable for STN operand, should be of type ANY_BIT.");
- if(!is_ANY_BIT_compatible(il_operand_type))
- STAGE3_ERROR(symbol, il_operand, "invalid data type of STN operand, should be of type ANY_BIT.");
- /* data type of il_default_variable_type is unchanged... */
- // il_default_variable_type = il_default_variable_type;
- return NULL;
-}
-
-//SYM_REF0(NOT_operator_c)
-void *visit_expression_type_c::visit(NOT_operator_c *symbol) {
- if(il_operand_type != NULL){
- STAGE3_ERROR(symbol, il_operand, "NOT operator may not have an operand.");
- return NULL;
- }
- if(il_default_variable_type == NULL) {
- STAGE3_ERROR(symbol, symbol, "Il default variable should not be NULL.");
- return NULL;
- }
- if(!is_ANY_BIT_compatible(il_default_variable_type)) {
- STAGE3_ERROR(symbol, symbol, "Il default variable should be of type ANY_BIT.");
- return NULL;
- }
- /* data type of il_default_variable_type is unchanged... */
- // il_default_variable_type = il_default_variable_type;
- return NULL;
-}
-
-// SYM_REF0(S_operator_c)
-void *visit_expression_type_c::visit(S_operator_c *symbol) {
- verify_null(symbol);
- if (!is_BOOL_type(il_default_variable_type)) {STAGE3_ERROR(symbol, symbol, "IL default variable should be BOOL type.");}
- if (!is_BOOL_type(il_operand_type)) {STAGE3_ERROR(symbol, il_operand, "operator S requires operand of type BOOL.");}
- /* TODO: check whether il_operand_type is an LVALUE !! */
- /* data type of il_default_variable_type is unchanged... */
- // il_default_variable_type = il_default_variable_type;
- return NULL;
-}
-
-// SYM_REF0(R_operator_c)
-void *visit_expression_type_c::visit(R_operator_c *symbol) {
- verify_null(symbol);
- if (!is_BOOL_type(il_default_variable_type)) {STAGE3_ERROR(symbol, symbol, "IL default variable should be BOOL type.");}
- if (!is_BOOL_type(il_operand_type)) {STAGE3_ERROR(symbol, il_operand, "operator R requires operand of type BOOL.");}
- /* TODO: check whether il_operand_type is an LVALUE !! */
- /* data type of il_default_variable_type is unchanged... */
- // il_default_variable_type = il_default_variable_type;
- return NULL;
-}
-
-
-// SYM_REF0(S1_operator_c)
-void *visit_expression_type_c::visit(S1_operator_c *symbol){
- check_il_fbcall(symbol, "S1");
- return NULL;
-}
-
-// SYM_REF0(R1_operator_c)
-void *visit_expression_type_c::visit(R1_operator_c *symbol) {
- check_il_fbcall(symbol, "R1");
- return NULL;
-}
-
-// SYM_REF0(CLK_operator_c)
-void *visit_expression_type_c::visit(CLK_operator_c *symbol) {
- check_il_fbcall(symbol, "CLK");
- return NULL;
-}
-
-// SYM_REF0(CU_operator_c)
-void *visit_expression_type_c::visit(CU_operator_c *symbol) {
- check_il_fbcall(symbol, "CU");
- return NULL;
-}
-
-// SYM_REF0(CD_operator_c)
-void *visit_expression_type_c::visit(CD_operator_c *symbol) {
- check_il_fbcall(symbol, "CD");
- return NULL;
-}
-
-// SYM_REF0(PV_operator_c)
-void *visit_expression_type_c::visit(PV_operator_c *symbol) {
- check_il_fbcall(symbol, "PV");
- return NULL;
-}
-
-// SYM_REF0(IN_operator_c)
-void *visit_expression_type_c::visit(IN_operator_c *symbol) {
- check_il_fbcall(symbol, "IN");
- return NULL;
-}
-
-// SYM_REF0(PT_operator_c)
-void *visit_expression_type_c::visit(PT_operator_c *symbol) {
- check_il_fbcall(symbol, "PT");
- return NULL;
-}
-
-//SYM_REF0(AND_operator_c)
-void *visit_expression_type_c::visit(AND_operator_c *symbol) {
- verify_null(symbol);
- il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_compatible,
- symbol , il_operand);
- return NULL;
-}
-
-//SYM_REF0(OR_operator_c)
-void *visit_expression_type_c::visit(OR_operator_c *symbol) {
- verify_null(symbol);
- il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_compatible,
- symbol , il_operand);
- return NULL;
-}
-
-//SYM_REF0(XOR_operator_c)
-void *visit_expression_type_c::visit(XOR_operator_c *symbol) {
- verify_null(symbol);
- il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_compatible,
- symbol , il_operand);
- return NULL;
-}
-
-// SYM_REF0(ANDN_operator_c)
-void *visit_expression_type_c::visit(ANDN_operator_c *symbol) {
- verify_null(symbol);
- il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_compatible,
- symbol , il_operand);
- return NULL;
-}
-
-// SYM_REF0(ORN_operator_c)
-void *visit_expression_type_c::visit(ORN_operator_c *symbol) {
- verify_null(symbol);
- il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_compatible,
- symbol , il_operand);
- return NULL;
-}
-
-// SYM_REF0(XORN_operator_c)
-void *visit_expression_type_c::visit(XORN_operator_c *symbol) {
- verify_null(symbol);
- il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_compatible,
- symbol , il_operand);
- return NULL;
-}
-
-// SYM_REF0(ADD_operator_c)
-void *visit_expression_type_c::visit(ADD_operator_c *symbol) {
- verify_null(symbol);
- symbol_c *left_type = il_default_variable_type;
- symbol_c *right_type = il_operand_type;
-
-/* The following is not required, it is already handled by compute_expression() ... */
-/*
- if (is_type(left_type, time_type_name_c) && is_type(right_type, time_type_name_c))
- il_default_variable_type = &time_type_name;
-*/
-
- if (is_type(left_type, tod_type_name_c) && is_type(right_type, time_type_name_c))
- il_default_variable_type = &tod_type_name;
- else if (is_type(left_type, safetod_type_name_c) && is_type(right_type, time_type_name_c))
- il_default_variable_type = &tod_type_name;
- else if (is_type(left_type, tod_type_name_c) && is_type(right_type, safetime_type_name_c))
- il_default_variable_type = &tod_type_name;
- else if (is_type(left_type, safetod_type_name_c) && is_type(right_type, safetime_type_name_c))
- il_default_variable_type = &safetod_type_name;
-
- else if (is_type(left_type, dt_type_name_c) && is_type(right_type, time_type_name_c))
- il_default_variable_type = &dt_type_name;
- else if (is_type(left_type, safedt_type_name_c) && is_type(right_type, time_type_name_c))
- il_default_variable_type = &dt_type_name;
- else if (is_type(left_type, dt_type_name_c) && is_type(right_type, safetime_type_name_c))
- il_default_variable_type = &dt_type_name;
- else if (is_type(left_type, safedt_type_name_c) && is_type(right_type, safetime_type_name_c))
- il_default_variable_type = &safedt_type_name;
-
- else il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_MAGNITUDE_compatible,
- symbol , il_operand);
- return NULL;
-}
-
-// SYM_REF0(SUB_operator_c)
-void *visit_expression_type_c::visit(SUB_operator_c *symbol) {
- verify_null(symbol);
- symbol_c *left_type = il_default_variable_type;
- symbol_c *right_type = il_operand_type;;
-
-/* The following is not required, it is already handled by compute_expression() ... */
-/*
- if (typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c))
- il_default_variable_type = &time_type_name;
-*/
-
- if (is_type(left_type, tod_type_name_c) && is_type(right_type, time_type_name_c))
- il_default_variable_type = &tod_type_name;
- else if (is_type(left_type, safetod_type_name_c) && is_type(right_type, time_type_name_c))
- il_default_variable_type = &tod_type_name;
- else if (is_type(left_type, tod_type_name_c) && is_type(right_type, safetime_type_name_c))
- il_default_variable_type = &tod_type_name;
- else if (is_type(left_type, safetod_type_name_c) && is_type(right_type, safetime_type_name_c))
- il_default_variable_type = &safetod_type_name;
-
- else if (is_type(left_type, dt_type_name_c) && is_type(right_type, time_type_name_c))
- il_default_variable_type = &dt_type_name;
- else if (is_type(left_type, safedt_type_name_c) && is_type(right_type, time_type_name_c))
- il_default_variable_type = &dt_type_name;
- else if (is_type(left_type, dt_type_name_c) && is_type(right_type, safetime_type_name_c))
- il_default_variable_type = &dt_type_name;
- else if (is_type(left_type, safedt_type_name_c) && is_type(right_type, safetime_type_name_c))
- il_default_variable_type = &safedt_type_name;
-
- else if (is_type(left_type, date_type_name_c) && is_type(right_type, date_type_name_c))
- il_default_variable_type = &time_type_name;
- else if (is_type(left_type, safedate_type_name_c) && is_type(right_type, date_type_name_c))
- il_default_variable_type = &time_type_name;
- else if (is_type(left_type, date_type_name_c) && is_type(right_type, safedate_type_name_c))
- il_default_variable_type = &time_type_name;
- else if (is_type(left_type, safedate_type_name_c) && is_type(right_type, safedate_type_name_c))
- il_default_variable_type = &safetime_type_name;
-
- else if (is_type(left_type, tod_type_name_c) && is_type(right_type, tod_type_name_c))
- il_default_variable_type = &time_type_name;
- else if (is_type(left_type, safetod_type_name_c) && is_type(right_type, tod_type_name_c))
- il_default_variable_type = &time_type_name;
- else if (is_type(left_type, tod_type_name_c) && is_type(right_type, safetod_type_name_c))
- il_default_variable_type = &time_type_name;
- else if (is_type(left_type, safetod_type_name_c) && is_type(right_type, safetod_type_name_c))
- il_default_variable_type = &safetime_type_name;
-
- else if (is_type(left_type, dt_type_name_c) && is_type(right_type, dt_type_name_c))
- il_default_variable_type = &time_type_name;
- else if (is_type(left_type, safedt_type_name_c) && is_type(right_type, dt_type_name_c))
- il_default_variable_type = &time_type_name;
- else if (is_type(left_type, dt_type_name_c) && is_type(right_type, safedt_type_name_c))
- il_default_variable_type = &time_type_name;
- else if (is_type(left_type, safedt_type_name_c) && is_type(right_type, safedt_type_name_c))
- il_default_variable_type = &safetime_type_name;
-
- else il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_MAGNITUDE_compatible,
- symbol , il_operand);
- return NULL;
-}
-
-// SYM_REF0(MUL_operator_c)
-void *visit_expression_type_c::visit(MUL_operator_c *symbol) {
- verify_null(symbol);
- symbol_c *left_type = il_default_variable_type;
- symbol_c *right_type = il_operand_type;
-
- if (is_type(left_type, time_type_name_c) && is_ANY_NUM_compatible(right_type))
- il_default_variable_type = &time_type_name;
- else if (is_type(left_type, safetime_type_name_c) && is_ANY_NUM_type(right_type))
- il_default_variable_type = &time_type_name;
- else if (is_type(left_type, safetime_type_name_c) && is_ANY_SAFENUM_type(right_type))
- il_default_variable_type = &safetime_type_name;
- /* Since we have already checked for ANY_NUM_type and ANY_SAFENUM_type in the previous lines,
- * this next line is really only to check for integers/reals of undefined type on 'right_type'...
- */
- else if (is_type(left_type, safetime_type_name_c) && is_ANY_NUM_compatible(right_type))
- il_default_variable_type = &safetime_type_name;
-
- else il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_NUM_compatible,
- symbol , il_operand);
- return NULL;
-}
-
-// SYM_REF0(DIV_operator_c)
-void *visit_expression_type_c::visit(DIV_operator_c *symbol) {
- verify_null(symbol);
- symbol_c *left_type = il_default_variable_type;
- symbol_c *right_type = il_operand_type;
-
- if (is_type(left_type, time_type_name_c) && is_ANY_NUM_compatible(right_type))
- il_default_variable_type = &time_type_name;
- else if (is_type(left_type, safetime_type_name_c) && is_ANY_NUM_type(right_type))
- il_default_variable_type = &time_type_name;
- else if (is_type(left_type, safetime_type_name_c) && is_ANY_SAFENUM_type(right_type))
- il_default_variable_type = &safetime_type_name;
- /* Since we have already checked for ANY_NUM_type and ANY_SAFENUM_type in the previous lines,
- * this next line is really only to check for integers/reals of undefined type on 'right_type'...
- */
- else if (is_type(left_type, safetime_type_name_c) && is_ANY_NUM_compatible(right_type))
- il_default_variable_type = &safetime_type_name;
-
- else il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_NUM_compatible,
- symbol , il_operand);
- return NULL;
-}
-
-// SYM_REF0(MOD_operator_c)
-void *visit_expression_type_c::visit(MOD_operator_c *symbol) {
- verify_null(symbol);
- il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_INT_compatible,
- symbol , il_operand);
- return NULL;
-}
-
-// SYM_REF0(GT_operator_c)
-void *visit_expression_type_c::visit(GT_operator_c *symbol) {
- verify_null(symbol);
- compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible,
- symbol , il_operand);
- il_default_variable_type = &search_expression_type_c::bool_type_name;
- return NULL;
-}
-
-//SYM_REF0(GE_operator_c)
-void *visit_expression_type_c::visit(GE_operator_c *symbol) {
- verify_null(symbol);
- compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible,
- symbol , il_operand);
- il_default_variable_type = &search_expression_type_c::bool_type_name;
- return NULL;
-}
-
-//SYM_REF0(EQ_operator_c)
-void *visit_expression_type_c::visit(EQ_operator_c *symbol) {
- verify_null(symbol);
- compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible,
- symbol , il_operand);
- il_default_variable_type = &search_expression_type_c::bool_type_name;
- return NULL;
-}
-
-//SYM_REF0(LT_operator_c)
-void *visit_expression_type_c::visit(LT_operator_c *symbol) {
- verify_null(symbol);
- compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible,
- symbol , il_operand);
- il_default_variable_type = &search_expression_type_c::bool_type_name;
- return NULL;
-}
-
-//SYM_REF0(LE_operator_c)
-void *visit_expression_type_c::visit(LE_operator_c *symbol) {
- verify_null(symbol);
- compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible,
- symbol , il_operand);
- il_default_variable_type = &search_expression_type_c::bool_type_name;
- return NULL;
-}
-
-//SYM_REF0(NE_operator_c)
-void *visit_expression_type_c::visit(NE_operator_c *symbol) {
- verify_null(symbol);
- compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible,
- symbol , il_operand);
- il_default_variable_type = &search_expression_type_c::bool_type_name;
- return NULL;
-}
-
-// SYM_REF0(CAL_operator_c)
-void *visit_expression_type_c::visit(CAL_operator_c *symbol) {
- return NULL;
-}
-
-// SYM_REF0(CALC_operator_c)
-void *visit_expression_type_c::visit(CALC_operator_c *symbol) {
- if(il_default_variable_type == NULL)
- STAGE3_ERROR(symbol, symbol, "CALC: il default variable should not be NULL.");
- if (!is_BOOL_type(il_default_variable_type))
- STAGE3_ERROR(symbol, symbol, "CALC operator requires il_default_variable to be of type BOOL.");
- return NULL;
-}
-
-// SYM_REF0(CALCN_operator_c)
-void *visit_expression_type_c::visit(CALCN_operator_c *symbol) {
- if(il_default_variable_type == NULL)
- STAGE3_ERROR(symbol, symbol, "CALCN: il_default_variable should not be NULL.");
- if (!is_BOOL_type(il_default_variable_type))
- STAGE3_ERROR(symbol, symbol, "CALCN operator requires il_default_variable to be of type BOOL.");
- return NULL;
-}
-
-// SYM_REF0(RET_operator_c)
-void *visit_expression_type_c::visit(RET_operator_c *symbol) {
- return NULL;
-}
-
-// SYM_REF0(RETC_operator_c)
-void *visit_expression_type_c::visit(RETC_operator_c *symbol) {
- if(il_default_variable_type == NULL)
- STAGE3_ERROR(symbol, symbol, "RETC: il default variable should not be NULL.");
- if (!is_BOOL_type(il_default_variable_type))
- STAGE3_ERROR(symbol, symbol, "RETC operator requires il_default_variable to be of type BOOL.");
- return NULL;
-}
-
-// SYM_REF0(RETCN_operator_c)
-void *visit_expression_type_c::visit(RETCN_operator_c *symbol) {
- if(il_default_variable_type == NULL)
- STAGE3_ERROR(symbol, symbol, "RETCN: il_default_variable should not be NULL.");
- if (!is_BOOL_type(il_default_variable_type))
- STAGE3_ERROR(symbol, symbol, "RETCN operator requires il_default_variable to be of type BOOL.");
- return NULL;
-}
-
-// SYM_REF0(JMP_operator_c)
-void *visit_expression_type_c::visit(JMP_operator_c *symbol){
- return NULL;
-}
-
-// SYM_REF0(JMPC_operator_c)
-void *visit_expression_type_c::visit(JMPC_operator_c *symbol) {
- if(il_default_variable_type == NULL)
- STAGE3_ERROR(symbol, symbol, "JMPC: il default variable should not be NULL.");
- if (!is_BOOL_type(il_default_variable_type))
- STAGE3_ERROR(symbol, symbol, "JMPC operator requires il_default_variable to be of type BOOL.");
- return NULL;
-}
-
-// SYM_REF0(JMPCN_operator_c)
-void *visit_expression_type_c::visit(JMPCN_operator_c *symbol) {
- if(il_default_variable_type == NULL)
- STAGE3_ERROR(symbol, symbol, "JMPCN: il_default_variable should not be NULL.");
- if (!is_BOOL_type(il_default_variable_type))
- STAGE3_ERROR(symbol, symbol, "JMPCN operator requires il_default_variable to be of type BOOL.");
- return NULL;
-}
-
-/* Symbol class handled together with function call checks */
-/* any_identifier ASSIGN */
-// SYM_REF1(il_assign_operator_c, variable_name)
-// void *visit_expression_type_c::visit(il_assign_operator_c *symbol, variable_name);
-
-/* Symbol class handled together with function call checks */
-/*| [NOT] any_identifier SENDTO */
-// SYM_REF2(il_assign_out_operator_c, option, variable_name)
-// void *visit_expression_type_c::visit(il_assign_operator_c *symbol, option, variable_name);
-
-
-
-
-
-/***************************************/
-/* B.3 - Language ST (Structured Text) */
-/***************************************/
-/***********************/
-/* B 3.1 - Expressions */
-/***********************/
-
-void *visit_expression_type_c::visit(or_expression_c *symbol) {
- symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
- symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
- return compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_BIT_compatible, symbol->l_exp, symbol->r_exp);
-}
-
-
-void *visit_expression_type_c::visit(xor_expression_c *symbol) {
- symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
- symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
- return compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_BIT_compatible, symbol->l_exp, symbol->r_exp);
-}
-
-
-void *visit_expression_type_c::visit(and_expression_c *symbol) {
- symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
- symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
- return compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_BIT_compatible, symbol->l_exp, symbol->r_exp);
-}
-
-
-void *visit_expression_type_c::visit(equ_expression_c *symbol) {
- symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
- symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
- compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_OR_ENUMERATED_compatible, symbol->l_exp, symbol->r_exp);
- return &search_expression_type_c::bool_type_name;
-}
-
-
-void *visit_expression_type_c::visit(notequ_expression_c *symbol) {
- symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
- symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
- compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_OR_ENUMERATED_compatible, symbol->l_exp, symbol->r_exp);
- return &search_expression_type_c::bool_type_name;
-}
-
-
-void *visit_expression_type_c::visit(lt_expression_c *symbol) {
- symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
- symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
- compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible, symbol->l_exp, symbol->r_exp);
- return &search_expression_type_c::bool_type_name;
-}
-
-
-void *visit_expression_type_c::visit(gt_expression_c *symbol) {
- symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
- symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
- compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible, symbol->l_exp, symbol->r_exp);
- return &search_expression_type_c::bool_type_name;
-}
-
-
-void *visit_expression_type_c::visit(le_expression_c *symbol) {
- symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
- symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
- compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible, symbol->l_exp, symbol->r_exp);
- return &search_expression_type_c::bool_type_name;
-}
-
-
-void *visit_expression_type_c::visit(ge_expression_c *symbol) {
- symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
- symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
- compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible, symbol->l_exp, symbol->r_exp);
- return &search_expression_type_c::bool_type_name;
-}
-
-
-void *visit_expression_type_c::visit(add_expression_c *symbol) {
- symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
- symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
-
-/* The following is already checked in compute_expression */
-/*
- if (is_type(left_type, time_type_name_c) && is_type(right_type, time_type_name_c))
- return (void *)&time_type_name;
-*/
-
- if (is_type(left_type, tod_type_name_c) && is_type(right_type, time_type_name_c))
- return (void *)&tod_type_name;
- if (is_type(left_type, safetod_type_name_c) && is_type(right_type, time_type_name_c))
- return (void *)&tod_type_name;
- if (is_type(left_type, tod_type_name_c) && is_type(right_type, safetime_type_name_c))
- return (void *)&tod_type_name;
- if (is_type(left_type, safetod_type_name_c) && is_type(right_type, safetime_type_name_c))
- return (void *)&safetod_type_name;
-
- if (is_type(left_type, dt_type_name_c) && is_type(right_type, time_type_name_c))
- return (void *)&dt_type_name;
- if (is_type(left_type, safedt_type_name_c) && is_type(right_type, time_type_name_c))
- return (void *)&dt_type_name;
- if (is_type(left_type, dt_type_name_c) && is_type(right_type, safetime_type_name_c))
- return (void *)&dt_type_name;
- if (is_type(left_type, safedt_type_name_c) && is_type(right_type, safetime_type_name_c))
- return (void *)&safedt_type_name;
-
- return compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_MAGNITUDE_compatible, symbol->l_exp, symbol->r_exp);
-}
-
-
-void *visit_expression_type_c::visit(sub_expression_c *symbol) {
- symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
- symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
-
-/* The following is already checked in compute_expression */
-/*
- if (is_type(left_type, time_type_name_c) && is_type(right_type, time_type_name_c))
- return (void *)&time_type_name;
-*/
-
- if (is_type(left_type, tod_type_name_c) && is_type(right_type, time_type_name_c))
- return (void *)&tod_type_name;
- if (is_type(left_type, safetod_type_name_c) && is_type(right_type, time_type_name_c))
- return (void *)&tod_type_name;
- if (is_type(left_type, tod_type_name_c) && is_type(right_type, safetime_type_name_c))
- return (void *)&tod_type_name;
- if (is_type(left_type, safetod_type_name_c) && is_type(right_type, safetime_type_name_c))
- return (void *)&safetod_type_name;
-
- if (is_type(left_type, dt_type_name_c) && is_type(right_type, time_type_name_c))
- return (void *)&dt_type_name;
- if (is_type(left_type, safedt_type_name_c) && is_type(right_type, time_type_name_c))
- return (void *)&dt_type_name;
- if (is_type(left_type, dt_type_name_c) && is_type(right_type, safetime_type_name_c))
- return (void *)&dt_type_name;
- if (is_type(left_type, safedt_type_name_c) && is_type(right_type, safetime_type_name_c))
- return (void *)&safedt_type_name;
-
- if (is_type(left_type, tod_type_name_c) && is_type(right_type, tod_type_name_c))
- return (void *)&time_type_name;
- if (is_type(left_type, safetod_type_name_c) && is_type(right_type, tod_type_name_c))
- return (void *)&time_type_name;
- if (is_type(left_type, tod_type_name_c) && is_type(right_type, safetod_type_name_c))
- return (void *)&time_type_name;
- if (is_type(left_type, safetod_type_name_c) && is_type(right_type, safetod_type_name_c))
- return (void *)&safetime_type_name;
-
- if (is_type(left_type, date_type_name_c) && is_type(right_type, date_type_name_c))
- return (void *)&time_type_name;
- if (is_type(left_type, safedate_type_name_c) && is_type(right_type, date_type_name_c))
- return (void *)&time_type_name;
- if (is_type(left_type, date_type_name_c) && is_type(right_type, safedate_type_name_c))
- return (void *)&time_type_name;
- if (is_type(left_type, safedate_type_name_c) && is_type(right_type, safedate_type_name_c))
- return (void *)&safetime_type_name;
-
- if (is_type(left_type, dt_type_name_c) && is_type(right_type, dt_type_name_c))
- return (void *)&time_type_name;
- if (is_type(left_type, safedt_type_name_c) && is_type(right_type, dt_type_name_c))
- return (void *)&time_type_name;
- if (is_type(left_type, dt_type_name_c) && is_type(right_type, safedt_type_name_c))
- return (void *)&time_type_name;
- if (is_type(left_type, safedt_type_name_c) && is_type(right_type, safedt_type_name_c))
- return (void *)&safetime_type_name;
-
- return compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_MAGNITUDE_compatible, symbol->l_exp, symbol->r_exp);
-}
-
-
-void *visit_expression_type_c::visit(mul_expression_c *symbol) {
- symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
- symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
-
- if (is_type(left_type, time_type_name_c) && is_ANY_NUM_compatible(right_type))
- return (void *)&time_type_name;
- if (is_type(left_type, safetime_type_name_c) && is_ANY_NUM_type(right_type))
- return (void *)&time_type_name;
- if (is_type(left_type, safetime_type_name_c) && is_ANY_SAFENUM_type(right_type))
- return (void *)&safetime_type_name;
- /* Since we have already checked for ANY_NUM_type and ANY_SAFENUM_type in the previous lines,
- * this next line is really only to check for integers/reals of undefined type on 'right_type'...
- */
- if (is_type(left_type, safetime_type_name_c) && is_ANY_NUM_compatible(right_type))
- return (void *)&safetime_type_name;
-
- return compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_NUM_compatible, symbol->l_exp, symbol->r_exp);
-}
-
-
-void *visit_expression_type_c::visit(div_expression_c *symbol) {
- symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
- symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
-
- if (is_type(left_type, time_type_name_c) && is_ANY_NUM_compatible(right_type))
- return (void *)&time_type_name;
- if (is_type(left_type, safetime_type_name_c) && is_ANY_NUM_type(right_type))
- return (void *)&time_type_name;
- if (is_type(left_type, safetime_type_name_c) && is_ANY_SAFENUM_type(right_type))
- return (void *)&safetime_type_name;
- /* Since we have already checked for ANY_NUM_type and ANY_SAFENUM_type in the previous lines,
- * this next line is really only to check for integers/reals of undefined type on 'right_type'...
- */
- if (is_type(left_type, safetime_type_name_c) && is_ANY_NUM_compatible(right_type))
- return (void *)&safetime_type_name;
-
- return compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_NUM_compatible, symbol->l_exp, symbol->r_exp);
-}
-
-
-void *visit_expression_type_c::visit(mod_expression_c *symbol) {
- symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
- symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
- return compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_INT_compatible, symbol->l_exp, symbol->r_exp);
-}
-
-
-void *visit_expression_type_c::visit(power_expression_c *symbol) {
- symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
- symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
- if (!is_ANY_REAL_compatible(left_type))
- STAGE3_ERROR(symbol->l_exp, symbol->l_exp, "first operand of ** operator has invalid data type, should be of type ANY_REAL.");
- if (!is_ANY_NUM_compatible(right_type))
- STAGE3_ERROR(symbol->r_exp, symbol->r_exp, "second operand of ** operator has invalid data type, should be of type ANY_NUM.");
-
- return (void *)left_type;
-}
-
-
-void *visit_expression_type_c::visit(neg_expression_c *symbol) {
- symbol_c *exp_type = base_type((symbol_c *)symbol->exp->accept(*this));
- if (!is_ANY_MAGNITUDE_compatible(exp_type))
- STAGE3_ERROR(symbol, symbol, "operand of negate expression '-' has invalid data type, should be of type ANY_MAGNITUDE.");
-
- return exp_type;
-}
-
-
-void *visit_expression_type_c::visit(not_expression_c *symbol) {
- symbol_c *type = base_type((symbol_c *)symbol->exp->accept(*this));
- return compute_expression(type, type, &visit_expression_type_c::is_ANY_BIT_compatible, NULL, symbol->exp);
-}
-
-
-void *visit_expression_type_c::visit(function_invocation_c *symbol) {
- function_symtable_t::iterator lower = function_symtable.lower_bound(symbol->function_name);
- function_symtable_t::iterator upper = function_symtable.upper_bound(symbol->function_name);
- function_symtable_t::iterator current;
- if (lower == function_symtable.end()) ERROR;
-
- symbol_c* return_data_type;
- symbol_c* fdecl_return_type;
- symbol_c* overloaded_data_type = NULL;
- int extensible_param_count = -1;
- symbol->called_function_declaration = NULL;
-
- function_symtable_t::iterator second = lower;
- second++;
- if (second == upper) {
- /* call to a function that is not overloaded. */
- /* now check the semantics of the function call... */
- /* If the syntax parser is working correctly, exactly one of the
- * following two symbols will be NULL, while the other is != NULL.
- */
- function_declaration_c *f_decl = function_symtable.get_value(lower);
- if (symbol-> formal_param_list != NULL) check_formal_call (symbol, f_decl);
- if (symbol->nonformal_param_list != NULL) check_nonformal_call(symbol, f_decl);
- /* Store the pointer to the declaration of the function being called.
- * This data will be used by stage 4 to call the correct function.
- * Mostly needed to disambiguate overloaded functions...
- * See comments in absyntax.def for more details
- */
- symbol->called_function_declaration = f_decl;
- return base_type(f_decl->type_name);
- }
-
- /* This is a call to an overloaded function... */
- if (debug) printf("visit_expression_type_c::visit(function_invocation_c *symbol): FOUND CALL TO OVERLOADED FUNCTION!!\n");
- for(current = lower; current != upper; current++) {
- if (debug) printf("visit_expression_type_c::visit(function_invocation_c *symbol): FOUND CALL TO OVERLOADED FUNCTION!! iterating...\n");
- int error_count = 0;
- function_declaration_c *f_decl = function_symtable.get_value(current);
- if (symbol-> formal_param_list != NULL) check_formal_call (symbol, f_decl, &error_count);
- if (symbol->nonformal_param_list != NULL) check_nonformal_call(symbol, f_decl, false, &error_count);
- if (0 == error_count) {
-
- fdecl_return_type = base_type(f_decl->type_name);
-
- if (symbol->called_function_declaration == NULL) {
- /* Store the pointer to the declaration of the function being called.
- * This data will be used by stage 4 to call the correct function.
- * Mostly needed to disambiguate overloaded functions...
- * See comments in absyntax.def for more details
- */
- symbol->called_function_declaration = f_decl;
- extensible_param_count = symbol->extensible_param_count;
-
- /* determine the base data type returned by the function being called... */
- return_data_type = fdecl_return_type;
- }
- else if (typeid(*return_data_type) != typeid(*fdecl_return_type)){
- return_data_type = common_literal(return_data_type, fdecl_return_type);
- overloaded_data_type = overloaded_return_type(return_data_type);
- }
-
- if (NULL == return_data_type) ERROR;
- }
- }
-
- if (overloaded_data_type != NULL) {
- for(current = lower; current != upper; current++) {
- function_declaration_c *f_decl = function_symtable.get_value(current);
- int error_count = 0;
- if (symbol-> formal_param_list != NULL) check_formal_call (symbol, f_decl, &error_count);
- if (symbol->nonformal_param_list != NULL) check_nonformal_call(symbol, f_decl, false, &error_count);
- if (0 == error_count) {
-
- fdecl_return_type = base_type(f_decl->type_name);
-
- if (typeid(*overloaded_data_type) == typeid(*fdecl_return_type)){
- /* Store the pointer to the declaration of the function being called.
- * This data will be used by stage 4 to call the correct function.
- * Mostly needed to disambiguate overloaded functions...
- * See comments in absyntax.def for more details
- */
- symbol->called_function_declaration = f_decl;
- extensible_param_count = symbol->extensible_param_count;
- }
- }
- }
- }
-
- if (return_data_type != NULL) {
- symbol->extensible_param_count = extensible_param_count;
- return return_data_type;
- }
-
- /* No compatible function was found for this function call */
- STAGE3_ERROR(symbol, symbol, "Call to an overloaded function with invalid parameter type.");
- return NULL;
-}
-
-/********************/
-/* B 3.2 Statements */
-/********************/
-// SYM_LIST(statement_list_c)
-/* The visitor of the base class search_visitor_c will handle calling each instruction in the list.
- * We do not need to do anything here...
- */
-// void *visit_expression_type_c::visit(statement_list_c *symbol)
-
-
-/*********************************/
-/* B 3.2.1 Assignment Statements */
-/*********************************/
-
-void *visit_expression_type_c::visit(assignment_statement_c *symbol) {
- symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
- symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
-
- if (debug) {
- printf("visit_expression_type_c::visit(assignment_statement_c) called. Checking --->");
- symbolic_variable_c *hi = dynamic_cast<symbolic_variable_c *>(symbol->l_exp);
- if (hi != NULL) {
- identifier_c *hi1 = dynamic_cast<identifier_c *>(hi->var_name);
- if (hi1 != NULL) printf("%s", hi1->value);
- }
- printf(" := ");
- hex_integer_c *hi2 = dynamic_cast<hex_integer_c *>(symbol->r_exp);
- if (hi2 != NULL) printf("%s", hi2->value);
- printf("\n");
- } // if (debug)
-
- if (NULL == left_type) {
- STAGE3_ERROR(symbol->l_exp, symbol->l_exp, "Could not determine data type of expression (undefined variable, constant, or structure element?).\n");
- } else if (NULL == right_type) {
- STAGE3_ERROR(symbol->r_exp, symbol->r_exp, "Could not determine data type of expression (undefined variable, constant, or structure element?).\n");
- } else if (!is_valid_assignment(left_type, right_type))
- STAGE3_ERROR(symbol, symbol, "data type mismatch in assignment statement!\n");
-
- return NULL;
-}
-
-
-
-/*****************************************/
-/* B 3.2.2 Subprogram Control Statements */
-/*****************************************/
-
-/* RETURN */
-// SYM_REF0(return_statement_c)
-
-
-/* fb_name '(' [param_assignment_list] ')' */
-/* param_assignment_list -> may be NULL ! */
-// SYM_REF3(fb_invocation_c, fb_name, formal_param_list, nonformal_param_list)
-void *visit_expression_type_c::visit(fb_invocation_c *symbol) {
- symbol_c *fb_decl = search_varfb_instance_type->get_basetype_decl(symbol->fb_name);
- /* The following should never occur. The function block must be defined,
- * and the FB type being called MUST be in the symtable...
- * This was all already checked at stage 2!
- */
- if (NULL == fb_decl) ERROR;
-
- /* now check the semantics of the fb call... */
- /* If the syntax parser is working correctly, exactly one of the
- * following two symbols will be NULL, while the other is != NULL.
- */
- if (symbol-> formal_param_list != NULL) check_formal_call (symbol, fb_decl);
- if (symbol->nonformal_param_list != NULL) check_nonformal_call(symbol, fb_decl);
-
- return NULL;
-}
-
-
-#if 0
-/* helper symbol for fb_invocation */
-/* param_assignment_list ',' param_assignment */
-SYM_LIST(param_assignment_list_c)
-
-/* variable_name ASSIGN expression */
-SYM_REF2(input_variable_param_assignment_c, variable_name, expression)
-
-/* [NOT] variable_name '=>' variable */
-SYM_REF3(output_variable_param_assignment_c, not_param, variable_name, variable)
-
-/* helper CLASS for output_variable_param_assignment */
-SYM_REF0(not_paramassign_c)
-#endif
-
-/********************************/
-/* B 3.2.3 Selection Statements */
-/********************************/
-
-/* IF expression THEN statement_list elseif_statement_list ELSE statement_list END_IF */
-// SYM_REF4(if_statement_c, expression, statement_list, elseif_statement_list, else_statement_list)
-void *visit_expression_type_c::visit(if_statement_c *symbol) {
- symbol_c *expr_type = base_type((symbol_c*)symbol->expression->accept(*this));
- if (!is_BOOL_type(expr_type)) STAGE3_ERROR(symbol->expression,symbol->expression,"IF conditional expression is not of boolean type.");
- if (NULL != symbol->statement_list)
- symbol->statement_list->accept(*this);
- if (NULL != symbol->elseif_statement_list)
- symbol->elseif_statement_list->accept(*this);
- if (NULL != symbol->else_statement_list)
- symbol->else_statement_list->accept(*this);
- return NULL;
-}
-
-/* helper symbol for if_statement */
-// SYM_LIST(elseif_statement_list_c)
-// void *visit_expression_type_c::visit(elseif_statement_list_c *symbol) { }
-
-/* helper symbol for elseif_statement_list */
-/* ELSIF expression THEN statement_list */
-// SYM_REF2(elseif_statement_c, expression, statement_list)
-void *visit_expression_type_c::visit(elseif_statement_c *symbol) {
- symbol_c *elseif_expr_type = base_type((symbol_c*)symbol->expression->accept(*this));
- if(!is_BOOL_type(elseif_expr_type)) STAGE3_ERROR(symbol->expression,symbol->expression,"ELSIF conditional expression is not of boolean type.");
- if (NULL != symbol->statement_list)
- symbol->statement_list->accept(*this);
- return NULL;
-}
-
-
-/* CASE expression OF case_element_list ELSE statement_list END_CASE */
-// SYM_REF3(case_statement_c, expression, case_element_list, statement_list)
-void *visit_expression_type_c::visit(case_statement_c *symbol) {
- case_expression_type = base_type((symbol_c*)symbol->expression->accept(*this));
- if (NULL != case_expression_type) {
- if (NULL != symbol->case_element_list)
- symbol->case_element_list->accept(*this);
- }
- if (NULL != symbol->statement_list)
- symbol->statement_list->accept(*this);
- return NULL;
-}
-
-#if 0
-/* helper symbol for case_statement */
-// SYM_LIST(case_element_list_c)
-// void *visit_expression_type_c::visit(case_element_list_c *symbol);
-
-/* case_list ':' statement_list */
-// SYM_REF2(case_element_c, case_list, statement_list)
-void *visit_expression_type_c::visit(case_element_c *symbol);
-#endif
-
-// SYM_LIST(case_list_c)
-void *visit_expression_type_c::visit(case_list_c *symbol) {
- symbol_c *element_type;
- for(int i = 0; i < symbol->n; i++) {
- element_type = (symbol_c *)symbol->elements[i]->accept(*this);
- if (NULL == element_type) {
- STAGE3_ERROR(symbol->elements[i], symbol->elements[i], "Case list element has undefined data type.");
- } else {
- element_type = base_type(element_type);
- if (NULL != element_type){
- /* The CASE value is only used for comparison (and not assingment), so we only check for compatibility! */
- if (!is_compatible_type(case_expression_type, element_type))
- STAGE3_ERROR(symbol->elements[i], symbol->elements[i], "Invalid data type of case list element.");
- }
- }
- }
- return NULL;
-}
-
-/********************************/
-/* B 3.2.4 Iteration Statements */
-/********************************/
-
-/* FOR control_variable ASSIGN expression TO expression [BY expression] DO statement_list END_FOR */
-// SYM_REF5(for_statement_c, control_variable, beg_expression, end_expression, by_expression, statement_list)
-void *visit_expression_type_c::visit(for_statement_c *symbol) {
- symbol_c *var_type = (symbol_c*)symbol->control_variable->accept(*this);
- if (NULL == var_type) ERROR;
- var_type = base_type(var_type);
- if (NULL == var_type) ERROR;
- // ASSIGN
- symbol_c *beg_expr_type = base_type((symbol_c*)symbol->beg_expression->accept(*this));
- if (NULL != beg_expr_type) {
- /* The BEG value is assigned to the variable, so we check for assignment validity! */
- if(!is_valid_assignment(var_type, beg_expr_type))
- STAGE3_ERROR(symbol->beg_expression, symbol->beg_expression, "Data type mismatch between control variable and initial value.");
- }
- // TO
- symbol_c *end_expr_type = base_type((symbol_c*)symbol->end_expression->accept(*this));
- if (NULL != end_expr_type) {
- /* The TO value is only used for comparison, so we only check for compatibility! */
- if(!is_compatible_type(var_type, end_expr_type))
- STAGE3_ERROR(symbol->end_expression, symbol->end_expression, "Data type mismatch between control variable and final value.");
- }
- // BY
- if(symbol->by_expression != NULL) {
- symbol_c *by_expr_type = base_type((symbol_c*)symbol->by_expression->accept(*this));
- if (NULL != end_expr_type) {
- /* The BY value is used in an expression (add, sub, ...), so we only check for compatibility! */
- if(!is_compatible_type(var_type, by_expr_type))
- STAGE3_ERROR(symbol->by_expression, symbol->by_expression, "Data type mismatch between control variable and BY value.");
- }
- }
- // DO
- if (NULL != symbol->statement_list)
- symbol->statement_list->accept(*this);
- return NULL;
-}
-
-
-/* WHILE expression DO statement_list END_WHILE */
-// SYM_REF2(while_statement_c, expression, statement_list)
-void *visit_expression_type_c::visit(while_statement_c *symbol) {
- symbol_c *expr_type = base_type((symbol_c*)symbol->expression->accept(*this));
- if (NULL != expr_type) {
- if(!is_BOOL_type(expr_type))
- STAGE3_ERROR(symbol->expression,symbol->expression,"WHILE conditional expression is not of boolean type.");
- }
-
- if (NULL != symbol->statement_list)
- symbol->statement_list->accept(*this);
- return NULL;
-}
-
-/* REPEAT statement_list UNTIL expression END_REPEAT */
-// SYM_REF2(repeat_statement_c, statement_list, expression)
-void *visit_expression_type_c::visit(repeat_statement_c *symbol) {
- if (NULL != symbol->statement_list)
- symbol->statement_list->accept(*this);
-
- symbol_c *expr_type = base_type((symbol_c*)symbol->expression->accept(*this));
- if (NULL != expr_type) {
- if(!is_BOOL_type(expr_type))
- STAGE3_ERROR(symbol->expression,symbol->expression,"REPEAT conditional expression is not of boolean type.");
- }
- return NULL;
-}
-
-/* EXIT */
-// SYM_REF0(exit_statement_c)
-
-
-