--- a/stage4/generate_c/function_call_param_iterator.cc Sat May 30 16:42:41 2009 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,560 +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)
- *
- */
-
-
-/*
- * Function call parameter iterator.
- * It will iterate through the formal parameters of a function call
- * (i.e. function calls using the foo(<param1>, <param2>, ...) syntax).
- * and/or search through the non-formal parameters of a function call
- * (i.e. function calls using the foo(<name1> = <param1>, <name2> = <param2>, ...) syntax).
- *
- * Calls to function blocks and programs are also supported.
- *
- * This is part of the 4th stage that generates
- * a c++ source program equivalent to the IL and ST
- * code.
- */
-
-
-
-
-
-
-//#include <stdio.h> /* required for NULL */
-//#include <string>
-//#include <iostream>
-
-//#include "../../util/symtable.hh"
-
-//#include "generate_c.hh"
-
-
-#include "../../absyntax/visitor.hh"
-
-
-/*
- * Function call parameter iterator.
- * It will iterate through the formal parameters of a function call
- * (i.e. function calls using the foo(<param1>, <param2>, ...) syntax).
- * and/or search through the non-formal parameters of a function call
- * (i.e. function calls using the foo(<name1> = <param1>, <name2> = <param2>, ...) syntax).
- *
- * Calls to function blocks and programs are also supported.
- *
- * Note that calls to next() will only iterate through formal parameters,
- * and calls to search() will only serach through non-formal parameters.
- */
-
-class function_call_param_iterator_c : public null_visitor_c {
- private:
- /* a pointer to the function call
- * (or function block or program call!)
- */
- symbol_c *f_call;
- int next_param, param_count;
- identifier_c *search_param_name;
-
- /* Which operation of the class was called...
- * Search a parameter, or iterate to the next parameter.
- */
- typedef enum {iterate_op, search_op} operation_t;
- operation_t current_operation;
-
- private:
- void *search_list(list_c *list) {
- switch (current_operation) {
- case iterate_op:
- for(int i = 0; i < list->n; i++) {
- void *res = list->elements[i]->accept(*this);
- if (NULL != res) {
- /* It went through the handle_parameter_assignment() function,
- * and is therefore a parameter assignment (<param> = <value>),
- * and not a simple expression (<value>).
- */
- /* we do nothing... */
- } else {
- param_count++;
- if (param_count == next_param) {
- return list->elements[i];
- }
- }
- }
- return NULL;
- break;
-
- case search_op:
- for(int i = 0; i < list->n; i++) {
- void *res = list->elements[i]->accept(*this);
- if (res != NULL)
- return res;
- }
- return NULL;
- break;
- } /* switch */
- return NULL;
- }
-
-
-
- void *handle_parameter_assignment(symbol_c *variable_name, symbol_c *expression) {
- switch (current_operation) {
- case iterate_op:
- /* UGLY HACK -> this will be detected in the search_list() function */
- return (void *)this; /* anything, as long as it is not NULL!! */
- break;
-
- case search_op:
- identifier_c *variable_name2 = dynamic_cast<identifier_c *>(variable_name);
-
- if (variable_name2 == NULL) {
- en_param_c *en_param = dynamic_cast<en_param_c *>(variable_name);
- if (en_param != NULL)
- variable_name2 = new identifier_c("EN");
- }
-
- if (variable_name2 == NULL) {
- eno_param_c *eno_param = dynamic_cast<eno_param_c *>(variable_name);
- if (eno_param != NULL)
- variable_name2 = new identifier_c("ENO");
- }
-
- if (variable_name2 == NULL) ERROR;
-
- if (strcasecmp(search_param_name->value, variable_name2->value) == 0)
- /* FOUND! This is the same parameter!! */
- return (void *)expression;
- return NULL;
- break;
- }
-
- ERROR;
- return NULL;
- }
-
-
-
- public:
- /* start off at the first parameter once again... */
- void reset(void) {
- next_param = param_count = 0;
- }
-
- /* initialise the iterator object.
- * We must be given a reference to the function/program/function block call
- * that will be analysed...
- */
- function_call_param_iterator_c(symbol_c *f_call) {
- /* It is expected that f_call will reference one of the following:
- * program_configuration_c
- * function_invocation_c
- * fb_invocation_c
- * il_function_call_c
- * il_formal_funct_call_c
- * ... (have I missed any?)
- */
- this->f_call = f_call;
- search_param_name = NULL;
- reset();
- }
-
- /* Skip to the next parameter. After object creation,
- * the object references on parameter _before_ the first, so
- * this function must be called once to get the object to
- * reference the first parameter...
- *
- * Returns whatever is being passed to the parameter!
- */
- symbol_c *next(void) {
- param_count = 0;
- next_param++;
- current_operation = function_call_param_iterator_c::iterate_op;
- void *res = f_call->accept(*this);
- return (symbol_c *)res;
- }
-
- /* Search for the value passed to the parameter named <param_name>... */
- symbol_c *search(symbol_c *param_name) {
- if (NULL == param_name) ERROR;
- search_param_name = dynamic_cast<identifier_c *>(param_name);
- if (NULL == search_param_name) ERROR;
- current_operation = function_call_param_iterator_c::search_op;
- void *res = f_call->accept(*this);
- return (symbol_c *)res;
- }
-
-
-
-
- private:
-/********************************/
-/* B 1.7 Configuration elements */
-/********************************/
-
-/*
-CONFIGURATION configuration_name
- optional_global_var_declarations
- (resource_declaration_list | single_resource_declaration)
- optional_access_declarations
- optional_instance_specific_initializations
-END_CONFIGURATION
-*/
-/*
-SYM_REF6(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, unused)
-*/
-
-/* helper symbol for configuration_declaration */
-/*
-SYM_LIST(resource_declaration_list_c)
-*/
-
-/*
-RESOURCE resource_name ON resource_type_name
- optional_global_var_declarations
- single_resource_declaration
-END_RESOURCE
-*/
-/*
-SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration)
-*/
-
-/* task_configuration_list program_configuration_list */
-/*
-SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)
-*/
-
-/* helper symbol for single_resource_declaration */
-/*
-SYM_LIST(task_configuration_list_c)
-*/
-
-/* helper symbol for single_resource_declaration */
-/*
-SYM_LIST(program_configuration_list_c)
-*/
-
-/* helper symbol for
- * - access_path
- * - instance_specific_init
- */
-/*
-SYM_LIST(any_fb_name_list_c)
-*/
-
-/* [resource_name '.'] global_var_name ['.' structure_element_name] */
-/*
-SYM_REF4(global_var_reference_c, resource_name, global_var_name, structure_element_name, unused)
-*/
-
-/* prev_declared_program_name '.' symbolic_variable */
-/*
-SYM_REF2(program_output_reference_c, program_name, symbolic_variable)
-*/
-
-/* TASK task_name task_initialization */
-/*
-SYM_REF2(task_configuration_c, task_name, task_initialization)
-*/
-
-/* '(' [SINGLE ASSIGN data_source ','] [INTERVAL ASSIGN data_source ','] PRIORITY ASSIGN integer ')' */
-/*
-SYM_REF4(task_initialization_c, single_data_source, interval_data_source, priority_data_source, unused)
-*/
-
-/* PROGRAM [RETAIN | NON_RETAIN] program_name [WITH task_name] ':' program_type_name ['(' prog_conf_elements ')'] */
-// SYM_REF6(program_configuration_c, retain_option, program_name, task_name, program_type_name, prog_conf_elements, unused)
- void *visit(program_configuration_c *symbol) {
- TRACE("program_configuration_c");
- return symbol->prog_conf_elements->accept(*this);
- }
-
-/* prog_conf_elements ',' prog_conf_element */
-// SYM_LIST(prog_conf_elements_c)
- void *visit(prog_conf_elements_c *symbol) {
- TRACE("prog_conf_elements_c");
- return search_list(symbol);
- }
-
-/* fb_name WITH task_name */
-/*
-SYM_REF2(fb_task_c, fb_name, task_name)
-*/
-
-/* any_symbolic_variable ASSIGN prog_data_source */
-// SYM_REF2(prog_cnxn_assign_c, symbolic_variable, prog_data_source)
- void *visit(prog_cnxn_assign_c *symbol) {
- TRACE("prog_cnxn_assign_c");
-
- /* NOTE: symbolic_variable may be something other than a symbolic_variable_c, but I (Mario)
- * do not understand the semantics that should be implmeneted if it is not a
- * symbolic_variable, so for the moment we simply give up!
- */
- symbolic_variable_c *symb_var = dynamic_cast<symbolic_variable_c *>(symbol->symbolic_variable);
- if (NULL == symb_var)
- ERROR;
-
- return handle_parameter_assignment(symb_var->var_name, symbol->prog_data_source);
- }
-
-/* any_symbolic_variable SENDTO data_sink */
-// SYM_REF2(prog_cnxn_sendto_c, symbolic_variable, prog_data_source)
- void *visit(prog_cnxn_sendto_c *symbol) {
- TRACE("prog_cnxn_sendto_c");
-
- /* NOTE: symbolic_variable may be something other than a symbolic_variable_c, but I (Mario)
- * do not understand the semantics that should be implmeneted if it is not a
- * symbolic_variable, so for the moment we simply give up!
- */
- symbolic_variable_c *symb_var = dynamic_cast<symbolic_variable_c *>(symbol->symbolic_variable);
- if (NULL == symb_var)
- ERROR;
-
- return handle_parameter_assignment(symb_var->var_name, symbol->data_sink);
- }
-
-/* VAR_CONFIG instance_specific_init_list END_VAR */
-/*
-SYM_REF2(instance_specific_initializations_c, instance_specific_init_list, unused)
-*/
-
-/* helper symbol for instance_specific_initializations */
-/*
-SYM_LIST(instance_specific_init_list_c)
-*/
-
-/* resource_name '.' program_name '.' {fb_name '.'}
- ((variable_name [location] ':' located_var_spec_init) | (fb_name ':' fb_initialization))
-*/
-/*
-SYM_REF6(instance_specific_init_c, resource_name, program_name, any_fb_name_list, variable_name, location, initialization)
-*/
-
-/* helper symbol for instance_specific_init */
-/* function_block_type_name ':=' structure_initialization */
-/*
-SYM_REF2(fb_initialization_c, function_block_type_name, structure_initialization)
-*/
-
-
-
-
-
-
-/****************************************/
-/* B.2 - Language IL (Instruction List) */
-/****************************************/
-/***********************************/
-/* B 2.1 Instructions and Operands */
-/***********************************/
-
-/* | function_name [il_operand_list] */
-// SYM_REF2(il_function_call_c, function_name, il_operand_list)
- void *visit(il_function_call_c *symbol) {
- TRACE("il_function_call_c");
- if (NULL != symbol->il_operand_list)
- return symbol->il_operand_list->accept(*this);
- 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) {
- TRACE("il_formal_funct_call_c");
- if (NULL != symbol->il_param_list)
- return symbol->il_param_list->accept(*this);
- 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) {
- TRACE("il_fb_call_c");
- /* the following should never occur. In reality the syntax parser
- * will guarantee that they never occur, but it makes it easier to
- * understand the remaining code :-)
- */
- //if ((NULL == symbol->il_operand_list) && (NULL == symbol->il_param_list)) ERROR;
- //if ((NULL != symbol->il_operand_list) && (NULL != symbol->il_param_list)) ERROR;
-
- if (NULL != symbol->il_operand_list)
- return symbol->il_operand_list->accept(*this);
- if (NULL != symbol->il_param_list)
- return symbol->il_param_list->accept(*this);
- return NULL;
- }
-
-
-
-/* | il_operand_list ',' il_operand */
-// SYM_LIST(il_operand_list_c)
- void *visit(il_operand_list_c *symbol) {
- TRACE("il_operand_list_c");
- return search_list(symbol);
- }
-
-
-/* | il_initial_param_list il_param_instruction */
-// SYM_LIST(il_param_list_c)
- void *visit(il_param_list_c *symbol) {
- TRACE("il_param_list_c");
- return search_list(symbol);
- }
-
-/* 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) {
- TRACE("il_param_assignment_c");
-
- // TODO : We do not yet handle a instruction list passed as parameter !!!
- // since we do not yet support it, it is best to simply stop than to fail silently...
- if (NULL != symbol->simple_instr_list) ERROR;
-
- return handle_parameter_assignment(symbol->il_assign_operator, symbol->il_operand);
- }
-
-/* 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) {
- TRACE("il_param_out_assignment_c");
- return handle_parameter_assignment((symbol_c *)symbol->il_assign_out_operator->accept(*this), symbol->variable);
- }
-
-
-/*******************/
-/* B 2.2 Operators */
-/*******************/
-/*| [NOT] any_identifier SENDTO */
-// SYM_REF2(il_assign_out_operator_c, option, variable_name)
- void *visit(il_assign_out_operator_c *symbol) {
- TRACE("il_assign_out_operator_c");
-
- // TODO : Handle not_param !!!
- // we do not yet support it, so it is best to simply stop than to fail silently...
- if (NULL != symbol->option) ERROR;
-
- return (void *)symbol->variable_name;
- }
-
-
-
-
-/***************************************/
-/* B.3 - Language ST (Structured Text) */
-/***************************************/
-/***********************/
-/* B 3.1 - Expressions */
-/***********************/
-
-/*
-SYM_REF2(function_invocation_c, function_name, parameter_assignment_list)
-*/
- void *visit(function_invocation_c *symbol) {
- TRACE("function_invocation_c");
- if ((symbol_c *)symbol == f_call && symbol->parameter_assignment_list != NULL)
- return symbol->parameter_assignment_list->accept(*this);
- else
- return NULL;
- }
-
-
-
-
-/********************/
-/* B 3.2 Statements */
-/********************/
-
-/*********************************/
-/* B 3.2.1 Assignment Statements */
-/*********************************/
-/*
-SYM_REF2(assignment_statement_c, l_exp, r_exp)
-*/
-
-/*****************************************/
-/* B 3.2.2 Subprogram Control Statements */
-/*****************************************/
-/* RETURN */
-// SYM_REF0(return_statement_c)
-
-
-/* fb_name '(' [param_assignment_list] ')' */
-/* param_assignment_list -> may be NULL ! */
-// SYM_REF2(fb_invocation_c, fb_name, param_assignment_list)
- void *visit(fb_invocation_c *symbol) {
- TRACE("fb_invocation_c");
- if (symbol->param_assignment_list != NULL)
- return symbol->param_assignment_list->accept(*this);
- else
- return NULL;
- }
-
-/* helper symbol for fb_invocation */
-/* param_assignment_list ',' param_assignment */
-// SYM_LIST(param_assignment_list_c)
- void *visit(param_assignment_list_c *symbol) {
- TRACE("param_assignment_list_c");
- return search_list(symbol);
- }
-
-/* variable_name ASSIGN expression */
-// SYM_REF2(input_variable_param_assignment_c, variable_name, expression)
- void *visit(input_variable_param_assignment_c *symbol) {
- TRACE("input_variable_param_assignment_c");
- return handle_parameter_assignment(symbol->variable_name, symbol->expression);
- }
-
-/* [NOT] variable_name '=>' variable */
-// SYM_REF4(output_variable_param_assignment_c, not_param, variable_name, variable, unused)
- void *visit(output_variable_param_assignment_c *symbol) {
- TRACE("output_variable_param_assignment_c");
- // TODO : Handle not_param !!!
- if (NULL != symbol->not_param) ERROR; // we do not yet support it, so it is best to simply stop than to fail silently...
-
- return handle_parameter_assignment(symbol->variable_name, symbol->variable);
- }
-
-/* helper CLASS for output_variable_param_assignment */
-// SYM_REF0(not_paramassign_c)
-// TODO... ???
-
-
-
-
-
-};
-
-
-
-
-
-