--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/stage4/generate_cc/function_call_param_iterator.cc Wed Jan 31 15:32:38 2007 +0100
@@ -0,0 +1,540 @@
+/*
+ * (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_cc.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) 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->prog_data_source);
+ }
+
+/* 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");
+ return symbol->parameter_assignment_list->accept(*this);
+ }
+
+
+
+
+/********************/
+/* 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");
+ return symbol->param_assignment_list->accept(*this);
+ }
+
+/* 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... ???
+
+
+
+
+
+};
+
+
+
+
+
+