--- a/stage4/generate_cc/generate_cc_il.cc Tue Oct 23 10:35:58 2007 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,1465 +0,0 @@
-/*
- * (c) 2003 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)
- *
- */
-
-
-/*
- * Conversion of il statements (i.e. IL code).
- *
- * This is part of the 4th stage that generates
- * a c++ source program equivalent to the IL and ST
- * code.
- */
-
-
-
-
-/***********************************************************************/
-/***********************************************************************/
-/***********************************************************************/
-/***********************************************************************/
-
-/* Returns the data type of an il_operand.
- *
- * Note that the il_operand may be a variable, in which case
- * we return the type of the variable instance.
- * The il_operand may also be a constant, in which case
- * we return the data type of that constant.
- *
- * The variable instance may be a member of a structured variable,
- * or an element in an array, or any combination of the two.
- *
- * The class constructor must be given the search scope
- * (function, function block or program within which
- * the possible il_operand variable instance was declared).
- */
-
-class search_il_operand_type_c {
-
- private:
- search_varfb_instance_type_c search_varfb_instance_type;
- search_constant_type_c search_constant_type;
-
- public:
- search_il_operand_type_c(symbol_c *search_scope): search_varfb_instance_type(search_scope) {}
-
- public:
- symbol_c *get_type(symbol_c *il_operand) {
- symbol_c *res;
-
- /* We first assume that it is a constant... */
- res = search_constant_type.get_type(il_operand);
- if (res != NULL) return res;
-
- /* Nope, now we assume it is a variable, and determine its type... */
- res = search_varfb_instance_type.get_type(il_operand);
- if (NULL != res) return res;
-
- /* not found */
- return NULL;
- }
-};
-
-
-
-/***********************************************************************/
-/***********************************************************************/
-/***********************************************************************/
-/***********************************************************************/
-
-
-/* A new class to ouput the il default variable to c++ code
- * We use this class, inheriting from symbol_c, so it may be used
- * as any other symbol_c object in the intermediate parse tree,
- * more specifically, so it can be used as any other il operand.
- * This makes the rest of the code much easier...
- *
- * Nevertheless, the basic visitor class visitor_c does not know
- * how to visit this new il_default_variable_c class, so we have
- * to extend that too.
- * In reality extending the basic symbols doesn't quite work out
- * as cleanly as desired (we need to use dynamic_cast in the
- * accept method of the il_default_variable_c), but it is cleaner
- * than the alternative...
- */
-class il_default_variable_c;
-
-/* This visitor class is not really required, we could place the
- * visit() method directly in genertae_cc_il_c, but doing it in
- * a seperate class makes the architecture more evident...
- */
-class il_default_variable_visitor_c {
- public:
- virtual void *visit(il_default_variable_c *symbol) = 0;
-
- virtual ~il_default_variable_visitor_c(void) {return;}
-};
-
-
-/* A class to print out to the resulting C++ code
- * the IL default variable name.
- *
- * It includes a reference to its name,
- * and the data type of the data currently stored
- * in this C++ variable... This is required because the
- * C++ variable is a union, and we must know which member
- * of the union top reference!!
- *
- * Note that we also need to keep track of the data type of
- * the value currently being stored in the default variable.
- * This is required so we can process parenthesis,
- *
- * e.g. :
- * LD var1
- * AND (
- * LD var2
- * OR var3
- * )
- *
- * Note that we only execute the 'AND (' operation when we come across
- * the ')', i.e. once we have evaluated the result of the
- * instructions inside the parenthesis.
- * When we do execute the 'AND (' operation, we need to know the data type
- * of the operand, which in this case is the result of the evaluation of the
- * instruction list inside the parenthesis. We can only know this if we
- * keep track of the data type currently stored in the default variable!
- *
- * We use the current_type inside the generate_cc_il::default_variable_name variable
- * to track this!
- */
-class il_default_variable_c: public symbol_c {
- public:
- symbol_c *var_name; /* in principle, this should point to an indentifier_c */
- symbol_c *current_type;
-
- public:
- il_default_variable_c(const char *var_name_str, symbol_c *current_type);
- virtual void *accept(visitor_c &visitor);
-};
-
-
-/***********************************************************************/
-/***********************************************************************/
-/***********************************************************************/
-/***********************************************************************/
-
-
-
-class generate_cc_il_c: public generate_cc_typedecl_c, il_default_variable_visitor_c {
-
- private:
- /* When compiling il code, it becomes necessary to determine the
- * data type of il operands. To do this, we must first find the
- * il operand's declaration, within the scope of the function block
- * or function currently being processed.
- * The following object does just that...
- * This object instance will then later be called while the
- * remaining il code is being handled.
- */
- //search_il_operand_type_c *search_il_operand_type;
- search_expression_type_c *search_expression_type;
-
- /* The initial value that should be given to the IL default variable
- * imediately after a parenthesis is opened.
- * This variable is only used to pass data from the
- * il_expression_c visitor to the simple_instr_list_c visitor.
- *
- * e.g.:
- * LD var1
- * AND ( var2
- * OR var3
- * )
- *
- * In the above code sample, the line 'AND ( var2' constitutes
- * an il_expression_c, where var2 should be loaded into the
- * il default variable before continuing with the expression
- * inside the parenthesis.
- * Unfortunately, only the simple_instr_list_c may do the
- * initial laoding of the var2 bariable following the parenthesis,
- * so the il_expression_c visitor will have to pass 'var2' as a
- * parameter to the simple_instr_list_c visitor.
- * Ergo, the existance of the following parameter...!
- */
- symbol_c *il_default_variable_init_value;
-
- /* Operand to the IL operation currently being processed... */
- /* These variables are used to pass data from the
- * il_simple_operation_c and il_expression_c visitors
- * to the il operator visitors (i.e. LD_operator_c,
- * LDN_operator_c, ST_operator_c, STN_operator_c, ...)
- */
- symbol_c *current_operand;
- symbol_c *current_operand_type;
-
- /* Label to which the current IL jump operation should jump to... */
- /* This variable is used to pass data from the
- * il_jump_operation_c visitor
- * to the il jump operator visitors (i.e. JMP_operator_c,
- * JMPC_operator_c, JMPCN_operator_c, ...)
- */
- symbol_c *jump_label;
-
- /* The result of the comparison IL operations (GT, EQ, LT, ...)
- * is a boolean variable.
- * This class keeps track of the current data type stored in the
- * il default variable. This is usually done by keeping a reference
- * to the data type of the last operand. Nevertheless, in the case of
- * the comparison IL operators, the data type of the result (a boolean)
- * is not the data type of the operand. We therefore need an object
- * of the boolean data type to keep as a reference of the current
- * data type.
- * The following object is it...
- */
- bool_type_name_c bool_type;
-
- /* the data type of the IL default variable... */
- #define IL_DEFVAR_T VAR_LEADER "IL_DEFVAR_T"
- /* The name of the IL default variable... */
- #define IL_DEFVAR VAR_LEADER "IL_DEFVAR"
- /* The name of the variable used to pass the result of a
- * parenthesised instruction list to the immediately preceding
- * scope ...
- */
- #define IL_DEFVAR_BACK VAR_LEADER "IL_DEFVAR_BACK"
- il_default_variable_c default_variable_name;
- il_default_variable_c default_variable_back_name;
-
- /* Some function calls in the body of functions or function blocks
- * may leave some parameters to their default values, and
- * ignore some output parameters of the function being called.
- * Our conversion of ST functions to C++ does not contemplate that,
- * i.e. each called function must get all it's input and output
- * parameters set correctly.
- * For input parameters we merely need to call the function with
- * the apropriate default value, but for output parameters
- * we must create temporary variables to hold the output value.
- *
- * We declare all the temporary output variables at the begining of
- * the body of each function or function block, and use them as
- * in function calls later on as they become necessary...
- * Note that we cannot create these variables just before a function
- * call, as the function call itself may be integrated within an
- * expression, or another function call!
- *
- * The variables are declared in the exact same order in which they
- * will be used later on during the function calls, which allows us
- * to simply re-create the name that was used for the temporary variable
- * instead of keeping it in some list.
- * The names are recreated by the temp_var_name_factory, after reset()
- * has been called!
- *
- * This function will genertae code similar to...
- *
- * INT __TMP_0 = 23;
- * REAL __TMP_1 = 45.5;
- * ...
- */
- temp_var_name_c temp_var_name_factory;
-
- /* When calling a function block, we must first find it's type,
- * by searching through the declarations of the variables currently
- * in scope.
- * This class does just that...
- * A new class is instantiated whenever we begin generating the code
- * for a function block type declaration, or a program declaration.
- * This object instance will then later be called while the
- * function block's or the program's body is being handled.
- *
- * Note that functions cannot contain calls to function blocks,
- * so we do not create an object instance when handling
- * a function declaration.
- */
- search_fb_instance_decl_c *search_fb_instance_decl;
-
-
- public:
- generate_cc_il_c(stage4out_c *s4o_ptr, symbol_c *scope, const char *variable_prefix = NULL)
- : generate_cc_typedecl_c(s4o_ptr),
- default_variable_name(IL_DEFVAR, NULL),
- default_variable_back_name(IL_DEFVAR_BACK, NULL)
- {
- //search_il_operand_type = new search_il_operand_type_c(scope);
- search_expression_type = new search_expression_type_c(scope);
- search_fb_instance_decl = new search_fb_instance_decl_c(scope);
- current_operand = NULL;
- current_operand_type = NULL;
- il_default_variable_init_value = NULL;
- this->set_variable_prefix(variable_prefix);
- }
-
- virtual ~generate_cc_il_c(void) {
- delete search_fb_instance_decl;
- //delete search_il_operand_type;
- delete search_expression_type;
- }
-
- void generate(instruction_list_c *il) {
- generate_cc_tempvardecl_c generate_cc_tempvardecl(&s4o);
- generate_cc_tempvardecl.generate(il, &temp_var_name_factory);
- il->accept(*this);
- }
-
- /* Declare the backup to the default variable, that will store the result
- * of the IL operations executed inside a parenthesis...
- */
- void declare_backup_variable(void) {
- s4o.print(s4o.indent_spaces);
- s4o.print(IL_DEFVAR_T);
- s4o.print(" ");
- print_backup_variable();
- s4o.print(";\n");
- }
-
- void print_backup_variable(void) {
- this->default_variable_back_name.accept(*this);
- }
-
- private:
- /* A helper function... */
- /*
- bool is_bool_type(symbol_c *type_symbol) {
- return (NULL != dynamic_cast<bool_type_name_c *>(type_symbol));
- }
- */
-
- /* A helper function... */
- void *XXX_operator(symbol_c *lo, const char *op, symbol_c *ro) {
- if ((NULL == lo) || (NULL == ro)) ERROR;
- if (NULL == op) ERROR;
-
- lo->accept(*this);
- s4o.print(op);
- ro->accept(*this);
- return NULL;
- }
-
- /* A helper function... */
- void *XXX_function(const char *func, symbol_c *lo, symbol_c *ro) {
- if ((NULL == lo) || (NULL == ro)) ERROR;
- if (NULL == func) ERROR;
-
- lo->accept(*this);
- s4o.print(" = ");
- s4o.print(func);
- s4o.print("(");
- lo->accept(*this);
- s4o.print(", ");
- ro->accept(*this);
- s4o.print(")");
- return NULL;
- }
-
- /* A helper function... */
- void *XXX_CAL_operator(const char *param_name, symbol_c *fb_name) {
- if (NULL == fb_name) ERROR;
- symbolic_variable_c *sv = dynamic_cast<symbolic_variable_c *>(fb_name);
- if (NULL == sv) ERROR;
- identifier_c *id = dynamic_cast<identifier_c *>(sv->var_name);
- if (NULL == id) ERROR;
-
- identifier_c param(param_name);
-
- //SYM_REF3(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list)
- il_param_assignment_c il_param_assignment(¶m, &this->default_variable_name, NULL);
- // SYM_LIST(il_param_list_c)
- il_param_list_c il_param_list;
- il_param_list.add_element(&il_param_assignment);
- CAL_operator_c CAL_operator;
- // SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list)
- il_fb_call_c il_fb_call(&CAL_operator, id, NULL, &il_param_list);
-
- il_fb_call.accept(*this);
- return NULL;
- }
-
- /* A helper function... */
- void *CMP_operator(symbol_c *o, const char *operation) {
- if (NULL == o) ERROR;
- if (NULL == this->default_variable_name.current_type) ERROR;
-
- symbol_c *backup = this->default_variable_name.current_type;
- this->default_variable_name.current_type = &(this->bool_type);
- this->default_variable_name.accept(*this);
- this->default_variable_name.current_type = backup;
-
- s4o.print(" = ");
- s4o.print(operation);
- this->default_variable_name.current_type->accept(*this);
- s4o.print("(2, ");
- this->default_variable_name.accept(*this);
- s4o.print(", ");
- o->accept(*this);
- s4o.print(")");
-
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = &(this->bool_type);
- return NULL;
- }
-
-
- /* A helper function... */
- void C_modifier(void) {
- if (search_expression_type->is_bool_type(default_variable_name.current_type)) {
- s4o.print("if (");
- this->default_variable_name.accept(*this);
- s4o.print(") ");
- }
- else {ERROR;}
- }
-
- /* A helper function... */
- void CN_modifier(void) {
- if (search_expression_type->is_bool_type(default_variable_name.current_type)) {
- s4o.print("if (!");
- this->default_variable_name.accept(*this);
- s4o.print(") ");
- }
- else {ERROR;}
- }
-
-
-public:
-void *visit(il_default_variable_c *symbol) {
- //s4o.print("il_default_variable_c VISITOR!!\n");
- symbol->var_name->accept(*this);
- if (NULL != symbol->current_type) {
- s4o.print(".");
- symbol->current_type->accept(*this);
- s4o.print("var");
- }
- return NULL;
-}
-
-
-private:
-
-/********************************************/
-/* B.1.4.1 Directly Represented Variables */
-/********************************************/
-// direct_variable: direct_variable_token {$$ = new direct_variable_c($1);};
-void *visit(direct_variable_c *symbol) {
- TRACE("direct_variable_c");
- /* Do not use print_token() as it will change everything into uppercase */
- if (strlen(symbol->value) == 0) ERROR;
- s4o.print("*(");
- this->print_variable_prefix();
- s4o.printlocation(symbol->value + 1);
- s4o.print(")");
- return NULL;
-}
-
-/****************************************/
-/* B.2 - Language IL (Instruction List) */
-/****************************************/
-
-/***********************************/
-/* B 2.1 Instructions and Operands */
-/***********************************/
-
-/* please see the comment before the RET_operator_c visitor for details... */
-#define END_LABEL VAR_LEADER "end"
-
-/*| instruction_list il_instruction */
-void *visit(instruction_list_c *symbol) {
-
- /* Declare the backup to the default variable, that will store the result
- * of the IL operations executed inside a parenthesis...
- */
- declare_backup_variable();
-
- /* Declare the default variable, that will store the result of the IL operations... */
- s4o.print(s4o.indent_spaces);
- s4o.print(IL_DEFVAR_T);
- s4o.print(" ");
- this->default_variable_name.accept(*this);
- s4o.print(";\n\n");
-
- print_list(symbol, s4o.indent_spaces, ";\n" + s4o.indent_spaces, ";\n");
-
- /* write the label marking the end of the code block */
- /* please see the comment before the RET_operator_c visitor for details... */
- s4o.print("\n");
- s4o.print(s4o.indent_spaces);
- s4o.print(END_LABEL);
- s4o.print(":\n");
- s4o.indent_right();
- /* since every label must be followed by at least one statement, and
- * only the functions will introduce the return statement after this label,
- * function blocks written in IL would result in invalid C++ code.
- * To work around this we introduce the equivalent of a 'nop' operation
- * to humour the compiler...
- */
- s4o.print(s4o.indent_spaces);
- s4o.print("/* to humour the compiler, we insert a nop */\n");
- s4o.print(s4o.indent_spaces);
- this->default_variable_name.accept(*this);
- s4o.print(" = ");
- this->default_variable_name.accept(*this);
- s4o.print(";\n");
- s4o.indent_left();
-
- return NULL;
-}
-
-
-/* | label ':' [il_incomplete_instruction] eol_list */
-// SYM_REF2(il_instruction_c, label, il_instruction)
-void *visit(il_instruction_c *symbol) {
- if (NULL != symbol->label) {
- symbol->label->accept(*this);
- s4o.print(":\n");
- s4o.print(s4o.indent_spaces);
- }
- symbol->il_instruction->accept(*this);
- return NULL;
-}
-
-/* | il_simple_operator [il_operand] */
-//SYM_REF2(il_simple_operation_c, il_simple_operator, il_operand)
-void *visit(il_simple_operation_c *symbol) {
- this->current_operand = symbol->il_operand;
- if (NULL == this->current_operand) {
- this->current_operand_type = NULL;
- } else {
- this->current_operand_type = search_expression_type->get_type(this->current_operand);
- if (NULL == this->current_operand_type) ERROR;
- }
-
- symbol->il_simple_operator->accept(*this);
-
- this->current_operand = NULL;
- this->current_operand_type = NULL;
- return NULL;
-}
-
-
-/* | function_name [il_operand_list] */
-// SYM_REF2(il_function_call_c, function_name, il_operand_list)
-void *visit(il_function_call_c *symbol) {
- function_declaration_c *f_decl = function_symtable.find_value(symbol->function_name);
-
- if (f_decl == function_symtable.end_value()) {
- /* should never occur. The function being called MUST be in the symtable... */
- function_type_t current_function_type = get_function_type((identifier_c *)symbol->function_name);
- if (current_function_type == function_none) ERROR;
-
- symbol_c *param_data_type = default_variable_name.current_type;
- symbol_c *return_data_type = (symbol_c *)search_expression_type->compute_standard_function_il(symbol, param_data_type);
- if (NULL == return_data_type) ERROR;
-
- default_variable_name.current_type = return_data_type;
- this->default_variable_name.accept(*this);
- default_variable_name.current_type = param_data_type;
- s4o.print(" = ");
-
- function_call_param_iterator_c function_call_param_iterator(symbol);
-
- int nb_param = 1;
- if (symbol->il_operand_list != NULL)
- nb_param += ((list_c *)symbol->il_operand_list)->n;
-
-#include "il_code_gen.c"
-
-#if 0
- for(int current_param = 0; current_param < nb_param; current_param++) {
- symbol_c *param_value;
- if (current_param == 0)
- param_value = &this->default_variable_name;
- else {
- symbol_c *param_name = NULL;
- switch (current_function_type) {
- default: ERROR;
- }
-
-
- /* Get the value from a foo(<param_name> = <param_value>) style call */
- param_value = function_call_param_iterator.search(param_name);
- delete param_name;
-
- /* Get the value from a foo(<param_value>) style call */
- if (param_value == NULL)
- param_value = function_call_param_iterator.next();
-
- if (param_value == NULL) ERROR;
- }
-
- switch (current_function_type) {
- case (function_sqrt):
- if (current_param == 0) {
- s4o.print("sqrt(");
- param_value->accept(*this);
- s4o.print(")");
- }
- else ERROR;
- break;
- default: ERROR;
- }
- } /* for(...) */
-#endif
-
- /* the data type returned by the function, and stored in the il default variable... */
- default_variable_name.current_type = return_data_type;
- }
- else {
- /* determine the base data type returned by the function being called... */
- search_base_type_c search_base_type;
- symbol_c *return_data_type = (symbol_c *)f_decl->type_name->accept(search_base_type);
- symbol_c *param_data_type = default_variable_name.current_type;
- if (NULL == return_data_type) ERROR;
-
- default_variable_name.current_type = return_data_type;
- this->default_variable_name.accept(*this);
- default_variable_name.current_type = param_data_type;
- s4o.print(" = ");
-
- symbol->function_name->accept(*this);
- s4o.print("(");
-
- /* loop through each function parameter, find the value we should pass
- * to it, and then output the c equivalent...
- */
-
- function_param_iterator_c fp_iterator(f_decl);
- identifier_c *param_name;
- function_call_param_iterator_c function_call_param_iterator(symbol);
- for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
- if (i != 1)
- s4o.print(", ");
-
- symbol_c *param_type = fp_iterator.param_type();
- if (param_type == NULL) ERROR;
-
- function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
-
-
- symbol_c *param_value = NULL;
-
- /* if it is the first parameter, semantics specifies that we should
- * get the value off the IL default variable!
- */
- if (1 == i)
- param_value = &this->default_variable_name;
-
- /* Get the value from a foo(<param_name> = <param_value>) style call */
- /* NOTE: the following line of code is not required in this case, but it doesn't
- * harm to leave it in, as in the case of a non-formal syntax function call,
- * it will always return NULL.
- * We leave it in in case we later decide to merge this part of the code together
- * with the function calling code in generate_cc_st_c, which does require
- * the following line...
- */
- if (param_value == NULL)
- param_value = function_call_param_iterator.search(param_name);
-
- /* Get the value from a foo(<param_value>) style call */
- if (param_value == NULL)
- param_value = function_call_param_iterator.next();
-
- switch (param_direction) {
- case function_param_iterator_c::direction_in:
- if (param_value == NULL) {
- /* No value given for parameter, so we must use the default... */
- /* First check whether default value specified in function declaration...*/
- param_value = fp_iterator.default_value();
- }
- if (param_value == NULL) {
- /* If not, get the default value of this variable's type */
- param_value = (symbol_c *)param_type->accept(*type_initial_value_c::instance());
- }
- if (param_value == NULL) ERROR;
- param_value->accept(*this);
- break;
- case function_param_iterator_c::direction_out:
- case function_param_iterator_c::direction_inout:
- if (param_value == NULL) {
- /* no parameter value given, so we pass a previously declared temporary variable. */
- std::string *temp_var_name = temp_var_name_factory.new_name();
- s4o.print(*temp_var_name);
- delete temp_var_name;
- } else {
- param_value->accept(*this);
- }
- break;
- case function_param_iterator_c::direction_extref:
- /* TODO! */
- ERROR;
- break;
- } /* switch */
- } /* for(...) */
-
- s4o.print(")");
- /* the data type returned by the function, and stored in the il default variable... */
- default_variable_name.current_type = return_data_type;
- }
-
- return NULL;
-}
-
-
-/* | il_expr_operator '(' [il_operand] eol_list [simple_instr_list] ')' */
-//SYM_REF4(il_expression_c, il_expr_operator, il_operand, simple_instr_list, unused)
-void *visit(il_expression_c *symbol) {
- /* We will be recursevely interpreting an instruction list,
- * so we store a backup of the data type of the value currently stored
- * in the default variable, and set the current data type to NULL
- */
- symbol_c *old_current_default_variable_data_type = this->default_variable_name.current_type;
- this->default_variable_name.current_type = NULL;
-
- /* Pass the symbol->il_operand to the simple_instr_list visitor
- * using the il_default_variable_init_value parameter...
- * Note that the simple_instr_list_c visitor will set this parameter
- * to NULL as soon as it does not require it any longer,
- * so we don't do it here again after the
- * symbol->simple_instr_list->accept(*this);
- * returns...
- */
- this->il_default_variable_init_value = symbol->il_operand;
-
- /* Now do the parenthesised instructions... */
- /* NOTE: the following code line will get the variable
- * this->default_variable_name.current_type updated!
- */
- symbol->simple_instr_list->accept(*this);
-
- /* Now do the operation, using the previous result! */
- /* NOTE: The result of the previous instruction list will be stored
- * in a variable named IL_DEFVAR_BACK. This is done in the visitor
- * to instruction_list_c objects...
- */
- this->current_operand = &(this->default_variable_back_name);
- this->current_operand_type = this->default_variable_back_name.current_type;
-
- this->default_variable_name.current_type = old_current_default_variable_data_type;
- if (NULL == this->current_operand_type) ERROR;
-
- symbol->il_expr_operator->accept(*this);
-
- this->current_operand = NULL;
- this->current_operand_type = NULL;
- this->default_variable_back_name.current_type = NULL;
- return NULL;
-}
-
-/* il_jump_operator label */
-// SYM_REF2(il_jump_operation_c, il_jump_operator, label)
-void *visit(il_jump_operation_c *symbol) {
- /* Pass the symbol->label to the il_jump_operation visitor
- * using the jump_label parameter...
- */
- this->jump_label = symbol->label;
- symbol->il_jump_operator->accept(*this);
- this->jump_label = NULL;
-
- return NULL;
-}
-
-/* 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(il_fb_call_c *symbol) {
- symbol->il_call_operator->accept(*this);
- s4o.print("{\n");
- s4o.indent_right();
- s4o.print(s4o.indent_spaces);
-
- /* first figure out what is the name of the function block type of the function block being called... */
- symbol_c *function_block_type_name = this->search_fb_instance_decl->get_type_name(symbol->fb_name);
- /* should never occur. The function block instance MUST have been declared... */
- if (function_block_type_name == NULL) ERROR;
-
- /* Now find the declaration of the function block type being called... */
- function_block_declaration_c *fb_decl = function_block_type_symtable.find_value(function_block_type_name);
- /* should never occur. The function block type being called MUST be in the symtable... */
- if (fb_decl == function_block_type_symtable.end_value()) ERROR;
-
- /* loop through each function block parameter, find the value we should pass
- * to it, and then output the c equivalent...
- */
- function_param_iterator_c fp_iterator(fb_decl);
- identifier_c *param_name;
- function_call_param_iterator_c function_call_param_iterator(symbol);
- for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
- function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
-
- /* Get the value from a foo(<param_name> = <param_value>) style call */
- symbol_c *param_value = function_call_param_iterator.search(param_name);
-
- /* Get the value from a foo(<param_value>) style call */
- if (param_value == NULL)
- param_value = function_call_param_iterator.next();
-
- /* now output the value assignment */
- if (param_value != NULL)
- if ((param_direction == function_param_iterator_c::direction_in) ||
- (param_direction == function_param_iterator_c::direction_inout)) {
- symbol->fb_name->accept(*this);
- s4o.print(".");
- param_name->accept(*this);
- s4o.print(" = ");
- param_value->accept(*this);
- s4o.print(";\n" + s4o.indent_spaces);
- }
- } /* for(...) */
-
- /* now call the function... */
- function_block_type_name->accept(*this);
- s4o.print(FB_FUNCTION_SUFFIX);
- s4o.print("(&");
- symbol->fb_name->accept(*this);
- s4o.print(")");
-
- /* loop through each function parameter, find the variable to which
- * we should atribute the value of all output or inoutput parameters.
- */
- fp_iterator.reset();
- function_call_param_iterator.reset();
- for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
- function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
-
- /* Get the value from a foo(<param_name> = <param_value>) style call */
- symbol_c *param_value = function_call_param_iterator.search(param_name);
-
- /* Get the value from a foo(<param_value>) style call */
- if (param_value == NULL)
- param_value = function_call_param_iterator.next();
-
- /* now output the value assignment */
- if (param_value != NULL)
- if ((param_direction == function_param_iterator_c::direction_out) ||
- (param_direction == function_param_iterator_c::direction_inout)) {
- s4o.print(";\n"+ s4o.indent_spaces);
- param_value->accept(*this);
- s4o.print(" = ");
- symbol->fb_name->accept(*this);
- s4o.print(".");
- param_name->accept(*this);
- }
- } /* for(...) */
-
- s4o.print(";\n");
- s4o.indent_left();
- s4o.print(s4o.indent_spaces);
- s4o.print("}");
-
- return NULL;
-}
-
-
-
-/* | function_name '(' eol_list [il_param_list] ')' */
-// SYM_REF2(il_formal_funct_call_c, function_name, il_param_list)
-void *visit(il_formal_funct_call_c *symbol) {
- function_declaration_c *f_decl = function_symtable.find_value(symbol->function_name);
-
- if (f_decl == function_symtable.end_value())
- /* should never occur. The function being called MUST be in the symtable... */
- ERROR;
-
- symbol->function_name->accept(*this);
- s4o.print("(");
-
- /* loop through each function parameter, find the value we should pass
- * to it, and then output the c equivalent...
- */
-
- function_param_iterator_c fp_iterator(f_decl);
- identifier_c *param_name;
- function_call_param_iterator_c function_call_param_iterator(symbol);
- for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
- if (i != 1)
- s4o.print(", ");
-
- symbol_c *param_type = fp_iterator.param_type();
- if (param_type == NULL) ERROR;
-
- function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
-
-
- symbol_c *param_value = NULL;
-
- /* Get the value from a foo(<param_name> = <param_value>) style call */
- if (param_value == NULL)
- param_value = function_call_param_iterator.search(param_name);
-
- /* Get the value from a foo(<param_value>) style call */
- /* NOTE: the following line of code is not required in this case, but it doesn't
- * harm to leave it in, as in the case of a formal syntax function call,
- * it will always return NULL.
- * We leave it in in case we later decide to merge this part of the code together
- * with the function calling code in generate_cc_st_c, which does require
- * the following line...
- */
- if (param_value == NULL)
- param_value = function_call_param_iterator.next();
-
- switch (param_direction) {
- case function_param_iterator_c::direction_in:
- if (param_value == NULL) {
- /* No value given for parameter, so we must use the default... */
- /* First check whether default value specified in function declaration...*/
- param_value = fp_iterator.default_value();
- }
- if (param_value == NULL) {
- /* If not, get the default value of this variable's type */
- param_value = (symbol_c *)param_type->accept(*type_initial_value_c::instance());
- }
- if (param_value == NULL) ERROR;
- param_value->accept(*this);
- break;
- case function_param_iterator_c::direction_out:
- case function_param_iterator_c::direction_inout:
- if (param_value == NULL) {
- /* no parameter value given, so we pass a previously declared temporary variable. */
- std::string *temp_var_name = temp_var_name_factory.new_name();
- s4o.print(*temp_var_name);
- delete temp_var_name;
- } else {
- param_value->accept(*this);
- }
- break;
- case function_param_iterator_c::direction_extref:
- /* TODO! */
- ERROR;
- break;
- } /* switch */
- } /* for(...) */
-
- // symbol->parameter_assignment->accept(*this);
- s4o.print(")");
- return NULL;
-}
-
-
-/* | il_operand_list ',' il_operand */
-// SYM_LIST(il_operand_list_c)
-void *visit(il_operand_list_c *symbol) {ERROR; return NULL;} // should never get called!
-
-
-/* | simple_instr_list il_simple_instruction */
-// SYM_LIST(simple_instr_list_c)
-void *visit(simple_instr_list_c *symbol) {
- /* A simple_instr_list_c is used to store a list of il operations
- * being done within parenthesis...
- *
- * e.g.:
- * LD var1
- * AND ( var2
- * OR var3
- * OR var4
- * )
- *
- * This will be converted to C++ by defining a new scope
- * with a new il default variable, and executing the il operands
- * within this new scope.
- * At the end of the scope the result, i.e. the value currently stored
- * in the il default variable is copied to the variable used to take this
- * value to the outside scope...
- *
- * The above example will result in the following C++ code:
- * {__IL_DEFVAR_T __IL_DEFVAR_BACK;
- * __IL_DEFVAR_T __IL_DEFVAR;
- *
- * __IL_DEFVAR.INTvar = var1;
- * {
- * __IL_DEFVAR_T __IL_DEFVAR;
- *
- * __IL_DEFVAR.INTvar = var2;
- * __IL_DEFVAR.INTvar |= var3;
- * __IL_DEFVAR.INTvar |= var4;
- *
- * __IL_DEFVAR_BACK = __IL_DEFVAR;
- * }
- * __IL_DEFVAR.INTvar &= __IL_DEFVAR_BACK.INTvar;
- *
- * }
- *
- * The intial value of the il default variable (in the above
- * example 'var2') is passed to this simple_instr_list_c visitor
- * using the il_default_variable_init_value parameter.
- * Since it is possible to have parenthesis inside other parenthesis
- * recursively, we reset the il_default_variable_init_value to NULL
- * as soon as we no longer require it, as it may be used once again
- * in the line
- * print_list(symbol, s4o.indent_spaces, ";\n" + s4o.indent_spaces, ";\n");
- *
- */
-
- /* Declare the default variable, that will store the result of the IL operations... */
- s4o.print("{\n");
- s4o.indent_right();
-
- s4o.print(s4o.indent_spaces);
- s4o.print(IL_DEFVAR_T);
- s4o.print(" ");
- this->default_variable_name.accept(*this);
- s4o.print(";\n\n");
-
- /* Check whether we should initiliase the il default variable... */
- if (NULL != this->il_default_variable_init_value) {
- /* Yes, we must... */
- /* We will do it by instatiating a LD operator, and having this
- * same generate_cc_il_c class visiting it!
- */
- LD_operator_c ld_oper;
- il_simple_operation_c il_simple_oper(&ld_oper, this->il_default_variable_init_value);
-
- s4o.print(s4o.indent_spaces);
- il_simple_oper.accept(*this);
- s4o.print(";\n");
- }
-
- /* this parameter no longer required... */
- this->il_default_variable_init_value = NULL;
-
- print_list(symbol, s4o.indent_spaces, ";\n" + s4o.indent_spaces, ";\n");
-
- /* copy the result in the default variable to the variable
- * used to pass the data out to the scope enclosing
- * the current scope!
- *
- * We also need to update the data type currently stored within
- * the variable used to pass the data to the outside scope...
- */
- this->default_variable_back_name.current_type = this->default_variable_name.current_type;
- s4o.print("\n");
- s4o.print(s4o.indent_spaces);
- this->default_variable_back_name.accept(*this);
- s4o.print(" = ");
- this->default_variable_name.accept(*this);
- s4o.print(";\n");
-
- s4o.indent_left();
- s4o.print(s4o.indent_spaces);
- s4o.print("}\n");
- s4o.print(s4o.indent_spaces);
- return NULL;
-}
-
-/* | il_initial_param_list il_param_instruction */
-// SYM_LIST(il_param_list_c)
-void *visit(il_param_list_c *symbol) {ERROR; return NULL;} // should never get called!
-
-/* il_assign_operator il_operand
- * | il_assign_operator '(' eol_list simple_instr_list ')'
- */
-// SYM_REF4(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list, unused)
-void *visit(il_param_assignment_c *symbol) {ERROR; return NULL;} // should never get called!
-
-/* il_assign_out_operator variable */
-// SYM_REF2(il_param_out_assignment_c, il_assign_out_operator, variable);
-void *visit(il_param_out_assignment_c *symbol) {ERROR; return NULL;} // should never get called!
-
-/*******************/
-/* B 2.2 Operators */
-/*******************/
-
-void *visit(LD_operator_c *symbol) {
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = this->current_operand_type;
- XXX_operator(&(this->default_variable_name), " = ", this->current_operand);
- return NULL;
-}
-
-void *visit(LDN_operator_c *symbol) {
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = this->current_operand_type;
- XXX_operator(&(this->default_variable_name),
- search_expression_type->is_bool_type(this->current_operand_type)?" = !":" = ~",
- this->current_operand);
- return NULL;
-}
-
-void *visit(ST_operator_c *symbol) {
- XXX_operator(this->current_operand, " = ",&(this->default_variable_name));
- /* the data type resulting from this operation is unchamged. */
- return NULL;
-}
-
-void *visit(STN_operator_c *symbol) {
- XXX_operator(this->current_operand,
- search_expression_type->is_bool_type(this->current_operand_type)?" = !":" = ~",
- &(this->default_variable_name));
- /* the data type resulting from this operation is unchamged. */
- return NULL;
-}
-
-void *visit(NOT_operator_c *symbol) {
- if ((NULL != this->current_operand) || (NULL != this->current_operand_type)) ERROR;
- XXX_operator(&(this->default_variable_name),
- search_expression_type->is_bool_type(this->default_variable_name.current_type)?" = !":" = ~",
- &(this->default_variable_name));
- /* the data type resulting from this operation is unchanged. */
- return NULL;
-}
-
-void *visit(S_operator_c *symbol) {
- if ((NULL == this->current_operand) || (NULL == this->current_operand_type)) ERROR;
-
- C_modifier();
- this->current_operand->accept(*this);
- s4o.print(search_expression_type->is_bool_type(this->current_operand_type)?" = true":" = 1");
- /* the data type resulting from this operation is unchanged! */
- return NULL;
-}
-
-void *visit(R_operator_c *symbol) {
- if ((NULL == this->current_operand) || (NULL == this->current_operand_type)) ERROR;
-
- C_modifier();
- this->current_operand->accept(*this);
- s4o.print(search_expression_type->is_bool_type(this->current_operand_type)?" = false":" = 0");
- /* the data type resulting from this operation is unchanged! */
- return NULL;
-}
-
-void *visit(S1_operator_c *symbol) {return XXX_CAL_operator("S1", this->current_operand);}
-void *visit(R1_operator_c *symbol) {return XXX_CAL_operator("R1", this->current_operand);}
-void *visit(CLK_operator_c *symbol) {return XXX_CAL_operator("CLK", this->current_operand);}
-void *visit(CU_operator_c *symbol) {return XXX_CAL_operator("CU", this->current_operand);}
-void *visit(CD_operator_c *symbol) {return XXX_CAL_operator("CD", this->current_operand);}
-void *visit(PV_operator_c *symbol) {return XXX_CAL_operator("PV", this->current_operand);}
-void *visit(IN_operator_c *symbol) {return XXX_CAL_operator("IN", this->current_operand);}
-void *visit(PT_operator_c *symbol) {return XXX_CAL_operator("PT", this->current_operand);}
-
-void *visit(AND_operator_c *symbol) {
- if (search_expression_type->is_binary_type(this->default_variable_name.current_type) &&
- search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
- XXX_operator(&(this->default_variable_name), " &= ", this->current_operand);
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = this->current_operand_type;
- }
- else {ERROR;}
- return NULL;
-}
-
-void *visit(OR_operator_c *symbol) {
- if (search_expression_type->is_binary_type(this->default_variable_name.current_type) &&
- search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
- XXX_operator(&(this->default_variable_name), " |= ", this->current_operand);
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = this->current_operand_type;
- }
- else {ERROR;}
- return NULL;
-}
-
-void *visit(XOR_operator_c *symbol) {
- if (search_expression_type->is_binary_type(this->default_variable_name.current_type) &&
- search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
- // '^' is a bit by bit exclusive OR !! Also seems to work with boolean types!
- XXX_operator(&(this->default_variable_name), " ^= ", this->current_operand);
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = this->current_operand_type;
- }
- else {ERROR;}
- return NULL;
-}
-
-void *visit(ANDN_operator_c *symbol) {
- if (search_expression_type->is_binary_type(this->default_variable_name.current_type) &&
- search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
- XXX_operator(&(this->default_variable_name),
- search_expression_type->is_bool_type(this->current_operand_type)?" &= !":" &= ~",
- this->current_operand);
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = this->current_operand_type;
- }
- else {ERROR;}
- return NULL;
-}
-
-void *visit(ORN_operator_c *symbol) {
- if (search_expression_type->is_binary_type(this->default_variable_name.current_type) &&
- search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
- XXX_operator(&(this->default_variable_name),
- search_expression_type->is_bool_type(this->current_operand_type)?" |= !":" |= ~",
- this->current_operand);
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = this->current_operand_type;
- }
- else {ERROR;}
- return NULL;
-}
-
-void *visit(XORN_operator_c *symbol) {
- if (search_expression_type->is_binary_type(this->default_variable_name.current_type) &&
- search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
- XXX_operator(&(this->default_variable_name),
- // bit by bit exclusive OR !! Also seems to work with boolean types!
- search_expression_type->is_bool_type(this->current_operand_type)?" ^= !":" ^= ~",
- this->current_operand);
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = this->current_operand_type;
- }
- else {ERROR;}
- return NULL;
-}
-
-void *visit(ADD_operator_c *symbol) {
- if (search_expression_type->is_time_type(this->default_variable_name.current_type) &&
- search_expression_type->is_time_type(this->current_operand_type)) {
- XXX_function("__time_add", &(this->default_variable_name), this->current_operand);
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = this->current_operand_type;
- return NULL;
- }
- if (search_expression_type->is_num_type(this->default_variable_name.current_type) &&
- search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
- XXX_operator(&(this->default_variable_name), " += ", this->current_operand);
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = this->current_operand_type;
- return NULL;
- }
- ERROR;
- return NULL;
-}
-
-void *visit(SUB_operator_c *symbol) {
- if (search_expression_type->is_time_type(this->default_variable_name.current_type) &&
- search_expression_type->is_time_type(this->current_operand_type)) {
- XXX_function("__time_sub", &(this->default_variable_name), this->current_operand);
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = this->current_operand_type;
- return NULL;
- }
- if (search_expression_type->is_num_type(this->default_variable_name.current_type) &&
- search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
- XXX_operator(&(this->default_variable_name), " -= ", this->current_operand);
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = this->current_operand_type;
- return NULL;
- }
- ERROR;
- return NULL;
-}
-
-void *visit(MUL_operator_c *symbol) {
- if (search_expression_type->is_time_type(this->default_variable_name.current_type) &&
- search_expression_type->is_integer_type(this->current_operand_type)) {
- XXX_function("__time_mul", &(this->default_variable_name), this->current_operand);
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = this->current_operand_type;
- return NULL;
- }
- if (search_expression_type->is_num_type(this->default_variable_name.current_type) &&
- search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
- XXX_operator(&(this->default_variable_name), " *= ", this->current_operand);
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = this->current_operand_type;
- return NULL;
- }
- ERROR;
- return NULL;
-}
-
-void *visit(DIV_operator_c *symbol) {
- if (search_expression_type->is_num_type(this->default_variable_name.current_type) &&
- search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
- XXX_operator(&(this->default_variable_name), " /= ", this->current_operand);
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = this->current_operand_type;
- }
- else {ERROR;}
- return NULL;
-}
-
-void *visit(MOD_operator_c *symbol) {
- if (search_expression_type->is_num_type(this->default_variable_name.current_type) &&
- search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
- XXX_operator(&(this->default_variable_name), " %= ", this->current_operand);
- /* the data type resulting from this operation... */
- this->default_variable_name.current_type = this->current_operand_type;
- }
- else {ERROR;}
- return NULL;
-}
-
-void *visit(GT_operator_c *symbol) {
- return CMP_operator(this->current_operand, "__gt_");
-}
-
-void *visit(GE_operator_c *symbol) {
- return CMP_operator(this->current_operand, "__ge_");
-}
-
-void *visit(EQ_operator_c *symbol) {
- return CMP_operator(this->current_operand, "__eq_");
-}
-
-void *visit(LT_operator_c *symbol) {
- return CMP_operator(this->current_operand, "__lt_");
-}
-
-void *visit(LE_operator_c *symbol) {
- return CMP_operator(this->current_operand, "__le_");
-}
-
-void *visit(NE_operator_c *symbol) {
- return CMP_operator(this->current_operand, "__ne_");
-}
-
-
-//SYM_REF0(CAL_operator_c)
-// This method will be called from within the il_fb_call_c visitor method
-void *visit(CAL_operator_c *symbol) {return NULL;}
-
-//SYM_REF0(CALC_operator_c)
-// This method will be called from within the il_fb_call_c visitor method
-void *visit(CALC_operator_c *symbol) {C_modifier(); return NULL;}
-
-//SYM_REF0(CALCN_operator_c)
-// This method will be called from within the il_fb_call_c visitor method
-void *visit(CALCN_operator_c *symbol) {CN_modifier(); return NULL;}
-
-/* NOTE: The semantics of the RET operator requires us to return a value
- * if the IL code is inside a function, but simply return no value if
- * the IL code is inside a function block or program!
- * Nevertheless, it is the generate_cc_c class itself that
- * introduces the 'reaturn <value>' into the c++ code at the end
- * of every function. This class does not know whether the IL code
- * is inside a function or a function block.
- * We work around this by jumping to the end of the code,
- * that will be marked by the END_LABEL label in the
- * instruction_list_c visitor...
- */
-// SYM_REF0(RET_operator_c)
-void *visit(RET_operator_c *symbol) {
- s4o.print("goto ");s4o.print(END_LABEL);
- return NULL;
-}
-
-// SYM_REF0(RETC_operator_c)
-void *visit(RETC_operator_c *symbol) {
- C_modifier();
- s4o.print("goto ");s4o.print(END_LABEL);
- return NULL;
-}
-
-// SYM_REF0(RETCN_operator_c)
-void *visit(RETCN_operator_c *symbol) {
- CN_modifier();
- s4o.print("goto ");s4o.print(END_LABEL);
- return NULL;
-}
-
-//SYM_REF0(JMP_operator_c)
-void *visit(JMP_operator_c *symbol) {
- if (NULL == this->jump_label) ERROR;
-
- s4o.print("goto ");
- this->jump_label->accept(*this);
- /* the data type resulting from this operation is unchanged! */
- return NULL;
-}
-
-// SYM_REF0(JMPC_operator_c)
-void *visit(JMPC_operator_c *symbol) {
- if (NULL == this->jump_label) ERROR;
-
- C_modifier();
- s4o.print("goto ");
- this->jump_label->accept(*this);
- /* the data type resulting from this operation is unchanged! */
- return NULL;
-}
-
-// SYM_REF0(JMPCN_operator_c)
-void *visit(JMPCN_operator_c *symbol) {
- if (NULL == this->jump_label) ERROR;
-
- CN_modifier();
- s4o.print("goto ");
- this->jump_label->accept(*this);
- /* the data type resulting from this operation is unchanged! */
- return NULL;
-}
-
-#if 0
-/*| [NOT] any_identifier SENDTO */
-SYM_REF2(il_assign_out_operator_c, option, variable_name)
-#endif
-
-}; /* generate_cc_il_c */
-
-
-
-
-
-
-
-
-
-/* The implementation of the single visit() member function
- * of il_default_variable_c.
- * It can only come after the full declaration of
- * generate_cc_il_c. Since we define and declare
- * generate_cc_il_c simultaneously, it can only come
- * after the definition...
- */
-void *il_default_variable_c::accept(visitor_c &visitor) {
- /* An ugly hack!! */
- /* This is required because we need to over-ride the base
- * accept(visitor_c &) method of the class symbol_c,
- * so this method may be called through a symbol_c *
- * reference!
- *
- * But, the visitor_c does not include a visitor to
- * an il_default_variable_c, which means that we couldn't
- * simply call visitor.visit(this);
- *
- * We therefore need to use the dynamic_cast hack!!
- *
- * Note too that we can't cast a visitor_c to a
- * il_default_variable_visitor_c, since they are not related.
- * Nor may the il_default_variable_visitor_c inherit from
- * visitor_c, because then generate_cc_il_c would contain
- * two visitor_c base classes, one each through
- * il_default_variable_visitor_c and generate_cc_type_c
- *
- * We could use virtual inheritance of the visitor_c, but it
- * would probably create more problems than it is worth!
- */
- generate_cc_il_c *v;
- v = dynamic_cast<generate_cc_il_c *>(&visitor);
- if (v == NULL) ERROR;
-
- return v->visit(this);
-}
-
-
-
-
-il_default_variable_c::il_default_variable_c(const char *var_name_str, symbol_c *current_type) {
- if (NULL == var_name_str) ERROR;
- /* Note: current_type may start off with NULL */
-
- this->var_name = new identifier_c(var_name_str);
- if (NULL == this->var_name) ERROR;
-
- this->current_type = current_type;
-}