--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/stage3/visit_expression_type.cc Thu Aug 27 16:29:23 2009 +0100
@@ -0,0 +1,1676 @@
+/*
+ * (c) 2009 Mario de Sousa
+ *
+ * Offered to the public under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2 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.
+ *
+ * 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 IL and ST 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_line < (symbol2)->first_line) ? (symbol1) : \
+ ((symbol1)->first_line > (symbol2)->first_line) ? (symbol2) : \
+ ((symbol1)->first_column < (symbol2)->first_column) ? (symbol1) : \
+ ((symbol1)->first_column > (symbol2)->first_column) ? (symbol2) : \
+ (symbol1))
+
+#define LAST_(symbol1, symbol2) (((symbol1)->last_line < (symbol2)->last_line) ? (symbol2) : \
+ ((symbol1)->last_line > (symbol2)->last_line) ? (symbol1) : \
+ ((symbol1)->last_column < (symbol2)->last_column) ? (symbol2) : \
+ ((symbol1)->last_column > (symbol2)->last_column) ? (symbol1) : \
+ (symbol1))
+
+#define STAGE3_ERROR(symbol1, symbol2, msg) { \
+ printf("semantic error between (%d:%d) and (%d:%d): %s\n", \
+ FIRST_(symbol1,symbol2)->first_line, FIRST_(symbol1,symbol2)->first_column, \
+ LAST_(symbol1,symbol2) ->last_line, LAST_(symbol1,symbol2) ->last_column, \
+ msg); \
+ il_error = true; \
+ }
+
+
+
+
+
+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);
+ 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;
+ 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);
+ 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;
+ 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);
+ 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;
+ return NULL;
+}
+
+
+
+
+
+
+
+
+
+visit_expression_type_c::visit_expression_type_c(symbol_c *search_scope) {
+}
+
+visit_expression_type_c::~visit_expression_type_c(void) {
+}
+
+
+/* A helper function... */
+bool visit_expression_type_c::is_ANY_ELEMENTARY_type(symbol_c *type_symbol) {
+ if (type_symbol == NULL) {ERROR;}
+ 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_MAGNITUDE_type(symbol_c *type_symbol) {
+ if (type_symbol == NULL) {ERROR;}
+ 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_NUM_type(symbol_c *type_symbol) {
+ if (type_symbol == NULL) {ERROR;}
+ return is_ANY_REAL_type(type_symbol) || is_ANY_INT_type(type_symbol);
+}
+
+
+/* A helper function... */
+bool visit_expression_type_c::is_ANY_DATE_type(symbol_c *type_symbol) {
+ if (type_symbol == NULL) {ERROR;}
+ 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_STRING_type(symbol_c *type_symbol) {
+ if (type_symbol == NULL) {ERROR;}
+ if (typeid(*type_symbol) == typeid(string_type_name_c)) {return true;}
+ if (typeid(*type_symbol) == typeid(wstring_type_name_c)) {return true;}
+ return false;
+}
+
+
+/* A helper function... */
+bool visit_expression_type_c::is_ANY_INT_type(symbol_c *type_symbol) {
+ if (type_symbol == NULL) {ERROR;}
+ 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;}
+ 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) {ERROR;}
+ if (typeid(*type_symbol) == typeid(real_type_name_c)) {return true;}
+ if (typeid(*type_symbol) == typeid(lreal_type_name_c)) {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) {ERROR;}
+ 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;}
+ if (is_literal_integer_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) {ERROR;}
+ if (typeid(*type_symbol) == typeid(bool_type_name_c)) {return true;}
+ if (is_literal_bool_type(type_symbol)) {return true;}
+ return false;
+}
+
+
+#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 true;}
+ 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 true;}
+ if (typeid(*type_symbol) == typeid(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 true;}
+ if (typeid(*type_symbol) == typeid(boolean_true_c)) {return true;}
+ if (typeid(*type_symbol) == typeid(boolean_false_c)) {return true;}
+ if (is_literal_integer_type(type_symbol))
+ if (sizeoftype(&bool_t) >= sizeoftype(type_symbol)) {return true;}
+ return false;
+}
+
+
+/* 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) {ERROR;}
+ 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;}
+
+ /* This 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...
+ */
+ if (typeid(*first_type) == typeid(*second_type)) {return first_type;}
+
+ 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_ANY_BIT_type(first_type) && is_literal_integer_type(second_type))
+ {return ((sizeoftype(first_type) >= sizeoftype(second_type))? first_type :NULL);}
+ if (is_ANY_BIT_type(second_type) && is_literal_integer_type(first_type))
+ {return ((sizeoftype(second_type) >= sizeoftype(first_type)) ? second_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_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);}
+
+ /* 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 TRUE if there is a common data type, otherwise return FALSE
+ */
+bool visit_expression_type_c::is_compatible_type(symbol_c *first_type, symbol_c *second_type) {
+ if (first_type == NULL || second_type == NULL) {ERROR;}
+ return (NULL != common_type__(first_type, second_type));
+}
+
+
+
+#define is_num_type is_ANY_NUM_type
+#define is_integer_type is_ANY_INT_type
+#define is_real_type is_ANY_REAL_type
+#define is_binary_type is_ANY_BIT_type
+ /* actually the ROR, ROL, SHL, and SHR function also accept boolean type! */
+#define is_nbinary_type is_ANY_BIT_type
+#define compute_standard_function_default visit_expression_type_c::compute_standard_function_default
+#define compute_standard_function_il visit_expression_type_c::compute_standard_function_il
+#define search_expression_type_c visit_expression_type_c
+#define search(x) search_f(x)
+#define next() next_nf()
+// #define search_constant_type_c::constant_int_type_name search_expression_type_c::integer
+#define constant_int_type_name integer
+#define is_same_type is_compatible_type
+#include "../absyntax_utils/search_type_code.c"
+#undef is_same_type
+#undef constant_int_type_name
+// #undef search_constant_type_c::constant_int_type_name
+#undef next
+#undef search
+#undef compute_standard_function_default
+#undef compute_standard_function_il
+#undef search_expression_type_c
+#undef is_real_type
+#undef is_binary_type
+#undef is_nbinary_type
+#undef is_integer_type
+#undef is_num_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) {
+ bool error = false;
+
+ if (!(this->*is_data_type)(left_type)) {
+ STAGE3_ERROR(left_type, left_type, "invalid data type of first operand.");
+ error = true;
+ }
+ if (!(this->*is_data_type)(right_type)) {
+ STAGE3_ERROR(right_type, right_type, "invalid data type of second operand.");
+ error = true;
+ }
+ if (!is_compatible_type(left_type, right_type)) {
+ STAGE3_ERROR(left_type, right_type, "type mismatch between operands.");
+ error = true;
+ }
+
+ if (error)
+ return NULL;
+ else
+ return common_type(left_type, right_type);
+}
+
+
+/* A helper function... */
+symbol_c *visit_expression_type_c::compute_numeric_expression(symbol_c *left_type, symbol_c *right_type,
+ is_data_type_t is_data_type) {
+ if (!(this->*is_data_type)(left_type))
+ STAGE3_ERROR(left_type, right_type, "Both parts of the equation must be the same type.");
+ if (!(this->*is_data_type)(right_type))
+ STAGE3_ERROR(left_type, right_type, "Both parts of the equation must be the same type.");
+ if (!is_compatible_type(left_type, right_type))
+ STAGE3_ERROR(left_type, right_type, "Both parts of the equation must be the same type.");
+
+ if (is_literal_integer_type(left_type) || is_literal_real_type(left_type)) {
+ return right_type;
+ } else {
+ return left_type;
+ }
+
+ /* humour the compiler... */
+ return NULL;
+}
+
+
+
+
+
+
+/* A helper function... */
+/* check the semantics of a FB or Function non-formal call */
+/* e.g. foo(1, 2, 3, 4); */
+void visit_expression_type_c::check_nonformal_call(symbol_c *f_call, symbol_c *f_decl, bool use_il_defvar) {
+ 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);
+
+ /* 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.
+ */
+ if(param_name != NULL) {
+ param_type = fp_iterator.param_type();
+ if(!is_compatible_type(il_default_variable_type,param_type))
+ STAGE3_ERROR(f_call, f_call, "In function/FB call, first parameter has invalid data type.");
+ }
+ } // 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 current parameter in the function call */
+ call_param_type = base_type((symbol_c*)call_param_value->accept(*this));
+ if (call_param_type == NULL) STAGE3_ERROR(call_param_value, call_param_value, "Could not determine data type of value being passed in function/FB call.");;
+
+ /* 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 parameter declared with that name */
+ if(param_name == NULL) {STAGE3_ERROR(f_call, f_call, "Too many parameters in function/FB call."); break;}
+ } while ((strcmp(param_name->value, "EN") == 0) || (strcmp(param_name->value, "ENO") == 0));
+
+ if(param_name != NULL) {
+ /* Get the parameter type */
+ param_type = fp_iterator.param_type();
+ /* If the declared parameter and the parameter from the function call do no have the same type */
+ if(!is_compatible_type(call_param_type,param_type)) STAGE3_ERROR(call_param_value, call_param_value, "Type mismatch in function/FB call parameter.");
+ }
+ }
+}
+
+void visit_expression_type_c::compute_input_operatores(symbol_c *symbol, const char *input_operator){
+ symbol_c *call_param_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){
+ STAGE3_ERROR(symbol, symbol, "Parameter operator needs an instance of a function block operand.");
+ ERROR;
+ }
+
+ /* Iterating through the formal parameters of the function call */
+ identifier_c call_param_name(input_operator);
+
+ /* Obtaining the type of the value being passed in the function call */
+ call_param_type = il_default_variable_type;
+ if (call_param_type == NULL) {
+ STAGE3_ERROR(&call_param_name, &call_param_name, "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_name, "Could not determine data type of value being passed in function/FB call.");
+
+
+ check_formal_parameter(&call_param_name, call_param_type, fb_decl);
+// return NULL;
+}
+
+void visit_expression_type_c::check_formal_parameter(symbol_c *call_param_name, symbol_c *call_param_type, symbol_c *f_decl) {
+ symbol_c *param_type;
+ identifier_c *param_name;
+ function_param_iterator_c fp_iterator(f_decl);
+
+ /* Find the corresponding parameter of the function being called */
+ param_name = fp_iterator.search(call_param_name);
+ if(param_name == NULL) {
+ STAGE3_ERROR(call_param_name, call_param_name, "Invalid parameter in function/FB call.");
+ } else {
+ /* Get the parameter type */
+ param_type = fp_iterator.param_type();
+ /* If the declared parameter and the parameter from the function call have the same type */
+// if(!is_compatible_type(call_param_type, param_type)) STAGE3_ERROR(call_param_name, call_param_value, "Type mismatch function/FB call parameter.");
+ if(!is_compatible_type(call_param_type, param_type)) STAGE3_ERROR(call_param_name, call_param_name, "Type mismatch function/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); */
+void visit_expression_type_c::check_formal_call(symbol_c *f_call, symbol_c *f_decl) {
+ 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);
+
+ /* 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){
+ 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) {
+ 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) {
+ STAGE3_ERROR(call_param_name, call_param_name, "Invalid parameter in function/FB call.");
+ } else {
+ /* Get the parameter type */
+ param_type = fp_iterator.param_type();
+ /* If the declared parameter and the parameter from the function call have the same type */
+ if(!is_compatible_type(call_param_type, param_type)) STAGE3_ERROR(call_param_name, call_param_value, "Type mismatch function/FB call parameter.");
+ }
+ }
+}
+
+
+
+
+/* a helper function... */
+symbol_c *visit_expression_type_c::base_type(symbol_c *symbol) {
+ 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, "Il default variable can't be NULL.");
+ }
+ if(il_operand_type == NULL){
+ STAGE3_ERROR(symbol, symbol, "function requires an operand.");
+ }
+ return NULL;
+}
+
+
+
+
+/*********************/
+/* B 1.4 - Variables */
+/*********************/
+
+void *visit_expression_type_c::visit(symbolic_variable_c *symbol) {
+ return search_varfb_instance_type->get_type(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_type(symbol);
+}
+
+void *visit_expression_type_c::visit(structured_variable_c *symbol) {
+ return search_varfb_instance_type->get_type(symbol);
+}
+
+
+
+/****************************************/
+/* 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 */
+ 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;
+ 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;
+
+ /* First find the declaration of the function being called! */
+ function_declaration_c *f_decl = function_symtable.find_value(symbol->function_name);
+
+ symbol_c *return_data_type = NULL;
+
+ if (f_decl == function_symtable.end_value()) {
+ function_type_t current_function_type = get_function_type((identifier_c *)symbol->function_name);
+ if (current_function_type == function_none) ERROR;
+ /* This code is for the functions that the user did not declare and that are
+ * part of the IL or ST languagem (built-in functions).
+ * For now we won't do the semantics analysis for that kind of functions.
+ */
+ /*
+ return_data_type = (symbol_c *)search_expression_type->compute_standard_function_default(NULL, symbol);
+ if (NULL == return_data_type) ERROR;
+
+ function_call_param_iterator_c fcp_iterator(symbol);
+
+ int nb_param = 0;
+ if (symbol->il_param_list != NULL)
+ nb_param += ((list_c *)symbol->il_param_list)->n;
+
+ identifier_c en_param_name("EN");*/
+ /* Get the value from EN param */
+ /*symbol_c *EN_param_value = fcp_iterator.search(&en_param_name);
+ if (EN_param_value == NULL)
+ EN_param_value = (symbol_c*)(new boolean_literal_c((symbol_c*)(new bool_type_name_c()), new boolean_true_c()));
+ else
+ nb_param --;
+ ADD_PARAM_LIST(EN_param_value, (symbol_c*)(new bool_type_name_c()), function_param_iterator_c::direction_in)
+
+ identifier_c eno_param_name("EN0");*/
+ /* Get the value from ENO param */
+ /*symbol_c *ENO_param_value = fcp_iterator.search(&eno_param_name);
+ if (ENO_param_value != NULL)
+ nb_param --;
+ ADD_PARAM_LIST(ENO_param_value, (symbol_c*)(new bool_type_name_c()), function_param_iterator_c::direction_out)
+
+ #include "st_code_gen.c"
+ */
+ } else {
+ /* determine the base data type returned by the function being called... */
+ return_data_type = base_type(f_decl->type_name);
+ /* If the following occurs, then we must have some big bug in the syntax parser (stage 2)... */
+ if (NULL == return_data_type) ERROR;
+
+ /* check semantics of data passed in the function call... */
+ check_nonformal_call(symbol, f_decl, true);
+
+ /* set the new ddata 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_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)
+ return NULL;
+ symbol->il_expr_operator->accept(*this);
+
+ 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_type( 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_type(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_type(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;
+
+ function_declaration_c *f_decl = function_symtable.find_value(symbol->function_name);
+
+ symbol_c *return_data_type = NULL;
+
+ if (f_decl == function_symtable.end_value()) {
+ function_type_t current_function_type = get_function_type((identifier_c *)symbol->function_name);
+ if (current_function_type == function_none) ERROR;
+
+ /* This code is for the functions that the user did not declare and that are
+ * part of the IL or ST languagem (built-in functions).
+ * For now we won't do the semantics analysis for that kind of functions.
+ */
+ #if 0
+ return_data_type = (symbol_c *)search_expression_type->compute_standard_function_default(NULL, symbol);
+ if (NULL == return_data_type) ERROR;
+
+ function_call_param_iterator_c fcp_iterator(symbol);
+
+ int nb_param = 0;
+ if (symbol->il_param_list != NULL)
+ nb_param += ((list_c *)symbol->il_param_list)->n;
+
+ identifier_c en_param_name("EN");
+ /* Get the value from EN param */
+ symbol_c *EN_param_value = fcp_iterator.search(&en_param_name);
+ if (EN_param_value == NULL)
+ EN_param_value = (symbol_c*)(new boolean_literal_c((symbol_c*)(new bool_type_name_c()), new boolean_true_c()));
+ else
+ nb_param --;
+ ADD_PARAM_LIST(EN_param_value, (symbol_c*)(new bool_type_name_c()), function_param_iterator_c::direction_in)
+
+ identifier_c eno_param_name("EN0");
+ /* Get the value from ENO param */
+ symbol_c *ENO_param_value = fcp_iterator.search(&eno_param_name);
+ if (ENO_param_value != NULL)
+ nb_param --;
+ ADD_PARAM_LIST(ENO_param_value, (symbol_c*)(new bool_type_name_c()), function_param_iterator_c::direction_out)
+
+ #include "st_code_gen.c"
+ #endif
+ } else {
+ /* determine the base data type returned by the function being called... */
+ return_data_type = base_type(f_decl->type_name);
+ /* 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;
+
+ /* check semantics of data passed in the function call... */
+ check_formal_call(symbol, f_decl);
+
+ /* 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_type(il_operand_type))
+ STAGE3_ERROR(symbol, symbol, "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_compatible_type(il_default_variable_type, il_operand_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_compatible_type(il_default_variable_type, il_operand_type))
+ STAGE3_ERROR(symbol, symbol, "Type mismatch in ST operation.");
+ /* TODO: check whether il_operand_type is an LVALUE !! */
+ if(!is_ANY_BIT_type(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_type(il_operand_type))
+ STAGE3_ERROR(symbol, symbol, "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, symbol, "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_type(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, symbol, "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, symbol, "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){
+ compute_input_operatores(symbol, "S1");
+ return NULL;
+}
+
+// SYM_REF0(R1_operator_c)
+void *visit_expression_type_c::visit(R1_operator_c *symbol) {
+ compute_input_operatores(symbol, "R1");
+ return NULL;
+}
+
+// SYM_REF0(CLK_operator_c)
+void *visit_expression_type_c::visit(CLK_operator_c *symbol) {
+ compute_input_operatores(symbol, "CLK");
+ return NULL;
+}
+
+// SYM_REF0(CU_operator_c)
+void *visit_expression_type_c::visit(CU_operator_c *symbol) {
+ compute_input_operatores(symbol, "CU");
+ return NULL;
+}
+
+// SYM_REF0(CD_operator_c)
+void *visit_expression_type_c::visit(CD_operator_c *symbol) {
+ compute_input_operatores(symbol, "CD");
+ return NULL;
+}
+
+// SYM_REF0(PV_operator_c)
+void *visit_expression_type_c::visit(PV_operator_c *symbol) {
+ compute_input_operatores(symbol, "PV");
+ return NULL;
+}
+
+// SYM_REF0(IN_operator_c)
+void *visit_expression_type_c::visit(IN_operator_c *symbol) {
+ compute_input_operatores(symbol, "IN");
+ return NULL;
+}
+
+// SYM_REF0(PT_operator_c)
+void *visit_expression_type_c::visit(PT_operator_c *symbol) {
+ compute_input_operatores(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_boolean_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_type);
+ 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_boolean_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_type);
+ 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_boolean_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_type);
+ 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_boolean_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_type);
+ 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_boolean_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_type);
+ 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_boolean_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_type);
+ 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;
+ if (typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c))
+ il_default_variable_type = &time_type_name;
+ else if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c))
+ il_default_variable_type = &tod_type_name;
+ else if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c))
+ il_default_variable_type = &dt_type_name;
+ else il_default_variable_type = compute_numeric_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_MAGNITUDE_type);
+ 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;;
+ if (typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c))
+ il_default_variable_type = &time_type_name;
+ else if (typeid(*left_type) == typeid(date_type_name_c) && typeid(*right_type) == typeid(date_type_name_c))
+ il_default_variable_type = &time_type_name;
+ else if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c))
+ il_default_variable_type = &tod_type_name;
+ else if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(tod_type_name_c))
+ il_default_variable_type = &time_type_name;
+ else if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c))
+ il_default_variable_type = &dt_type_name;
+ else if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(dt_type_name_c))
+ il_default_variable_type = &time_type_name;
+ else il_default_variable_type = compute_numeric_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_MAGNITUDE_type);
+ 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 (typeid(*left_type) == typeid(time_type_name_c) && is_ANY_NUM_type(right_type))
+ il_default_variable_type = &time_type_name;
+ else il_default_variable_type = compute_numeric_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_NUM_type);
+ 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 (typeid(*left_type) == typeid(time_type_name_c) && is_ANY_NUM_type(right_type))
+ il_default_variable_type = &time_type_name;
+ else il_default_variable_type = compute_numeric_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_NUM_type);
+ 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_numeric_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_INT_type);
+ return NULL;
+}
+
+// SYM_REF0(GT_operator_c)
+void *visit_expression_type_c::visit(GT_operator_c *symbol) {
+ verify_null(symbol);
+ compute_boolean_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_type);
+ 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_boolean_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_type);
+ 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_boolean_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_type);
+ 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_boolean_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_type);
+ 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_boolean_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_type);
+ 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_boolean_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_type);
+ 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_boolean_expression(left_type, right_type, &visit_expression_type_c::is_ANY_BIT_type);
+}
+
+
+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_boolean_expression(left_type, right_type, &visit_expression_type_c::is_ANY_BIT_type);
+}
+
+
+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_boolean_expression(left_type, right_type, &visit_expression_type_c::is_ANY_BIT_type);
+}
+
+
+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_boolean_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_type);
+ 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_boolean_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_type);
+ 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_boolean_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_type);
+ 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_boolean_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_type);
+ 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_boolean_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_type);
+ 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_boolean_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_type);
+ 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));
+ if (typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&time_type_name;}
+ if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&tod_type_name;}
+ if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&dt_type_name;}
+ return compute_numeric_expression(left_type, right_type, &visit_expression_type_c::is_ANY_MAGNITUDE_type);
+}
+
+
+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));
+ if (typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&time_type_name;}
+ if (typeid(*left_type) == typeid(date_type_name_c) && typeid(*right_type) == typeid(date_type_name_c)) {return (void *)&time_type_name;}
+ if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&tod_type_name;}
+ if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(tod_type_name_c)) {return (void *)&time_type_name;}
+ if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&dt_type_name;}
+ if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(dt_type_name_c)) {return (void *)&time_type_name;}
+ return compute_numeric_expression(left_type, right_type, &visit_expression_type_c::is_ANY_MAGNITUDE_type);
+}
+
+
+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 (typeid(*left_type) == typeid(time_type_name_c) && is_ANY_NUM_type(right_type)) {return (void *)&time_type_name;}
+ return compute_numeric_expression(left_type, right_type, &visit_expression_type_c::is_ANY_NUM_type);
+}
+
+
+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 (typeid(*left_type) == typeid(time_type_name_c) && is_ANY_NUM_type(right_type)){return (void *)&time_type_name;}
+ return compute_numeric_expression(left_type, right_type, &visit_expression_type_c::is_ANY_NUM_type);
+}
+
+
+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_numeric_expression(left_type, right_type, &visit_expression_type_c::is_ANY_INT_type);
+}
+
+
+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_type(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_type(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_type(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_boolean_expression(type, type, &visit_expression_type_c::is_ANY_BIT_type);
+}
+
+
+void *visit_expression_type_c::visit(function_invocation_c *symbol) {
+ function_declaration_c *f_decl = function_symtable.find_value(symbol->function_name);
+ if (f_decl == function_symtable.end_value()) {
+ /* TODO: the following code is for standard library functions. We do not yet support this... */
+ void *res = compute_standard_function_default(symbol);
+ if (res != NULL) return res;
+ ERROR;
+ }
+
+ /* 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.
+ */
+ if (symbol-> formal_param_list != NULL) check_formal_call (symbol, f_decl);
+ if (symbol->nonformal_param_list != NULL) check_nonformal_call(symbol, f_decl);
+
+ return base_type(f_decl->type_name);
+}
+
+/********************/
+/* 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 (!is_compatible_type(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_type(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,symbol,"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,symbol,"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){
+ 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) {
+ if(!is_compatible_type(var_type,beg_expr_type))
+ STAGE3_ERROR(symbol, symbol, "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) {
+ if(!is_compatible_type(var_type,end_expr_type))
+ STAGE3_ERROR(symbol, symbol, "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) {
+ if(!is_compatible_type(var_type,by_expr_type))
+ STAGE3_ERROR(symbol, symbol, "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,symbol,"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,symbol,"REPEAT conditional expression is not of boolean type.");
+ }
+ return NULL;
+}
+
+/* EXIT */
+// SYM_REF0(exit_statement_c)
+
+
+