diff -r 41cb5b80416e -r e1f0ebd2d9ec stage4/generate_cc/generate_cc_il.cc --- 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(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(fb_name); - if (NULL == sv) ERROR; - identifier_c *id = dynamic_cast(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( = ) style call */ - param_value = function_call_param_iterator.search(param_name); - delete param_name; - - /* Get the value from a foo() 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( = ) 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() 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( = ) style call */ - symbol_c *param_value = function_call_param_iterator.search(param_name); - - /* Get the value from a foo() 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( = ) style call */ - symbol_c *param_value = function_call_param_iterator.search(param_name); - - /* Get the value from a foo() 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( = ) style call */ - if (param_value == NULL) - param_value = function_call_param_iterator.search(param_name); - - /* Get the value from a foo() 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 ' 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(&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; -}