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/*
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* (c) 2007 Mario de Sousa and Laurent Bessard
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*
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* Offered to the public under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* Public License for more details.
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*
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* This code is made available on the understanding that it will not be
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* used in safety-critical situations without a full and competent review.
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*/
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/*
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* An IEC 61131-3 IL and ST compiler.
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*
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* Based on the
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* FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
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*
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*/
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/*
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* This is one of the versions available for the 4th stage.
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*
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* This 4th stage generates a c++ source program equivalent
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* to the IL and ST code.
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*/
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#define INLINE_RESULT_TEMP_VAR "__res"
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class generate_c_inline_c: public generate_c_typedecl_c {
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private:
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/* The name of the IL default variable... */
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#define IL_DEFVAR VAR_LEADER "IL_DEFVAR"
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/* The name of the variable used to pass the result of a
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* parenthesised instruction list to the immediately preceding
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* scope ...
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*/
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il_default_variable_c default_variable_name;
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int fcall_number;
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symbol_c *fbname;
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search_expression_type_c *search_expression_type;
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search_varfb_instance_type_c *search_varfb_instance_type;
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search_base_type_c search_base_type;
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public:
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generate_c_inline_c(stage4out_c *s4o_ptr, symbol_c *name, symbol_c *scope, const char *variable_prefix = NULL)
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: generate_c_typedecl_c(s4o_ptr),
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default_variable_name(IL_DEFVAR, NULL)
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{
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search_expression_type = new search_expression_type_c(scope);
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search_varfb_instance_type = new search_varfb_instance_type_c(scope);
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this->set_variable_prefix(variable_prefix);
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fcall_number = 0;
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fbname = name;
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}
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virtual ~generate_c_inline_c(void) {
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delete search_varfb_instance_type;
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}
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void *generate_inline(symbol_c *function_name,
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symbol_c *return_data_type,
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std::list<FUNCTION_PARAM*> param_list) {
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std::list<FUNCTION_PARAM*>::iterator pt;
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fcall_number++;
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s4o.print(s4o.indent_spaces);
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s4o.print("inline ");
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return_data_type->accept(*this);
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s4o.print(" __");
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fbname->accept(*this);
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s4o.print("_");
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function_name->accept(*this);
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s4o.print_integer(fcall_number);
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s4o.print("(");
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s4o.indent_right();
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PARAM_LIST_ITERATOR() {
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if (PARAM_DIRECTION == function_param_iterator_c::direction_in) {
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PARAM_TYPE->accept(*this);
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s4o.print(" ");
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PARAM_NAME->accept(*this);
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s4o.print(",\n" + s4o.indent_spaces);
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}
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}
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fbname->accept(*this);
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s4o.print(" *");
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s4o.print(FB_FUNCTION_PARAM);
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s4o.indent_left();
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s4o.print(")\n" + s4o.indent_spaces);
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s4o.print("{\n");
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s4o.indent_right();
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s4o.print(s4o.indent_spaces);
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return_data_type->accept(*this);
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s4o.print(" "),
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s4o.print(INLINE_RESULT_TEMP_VAR);
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s4o.print(";\n");
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PARAM_LIST_ITERATOR() {
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if ((PARAM_DIRECTION == function_param_iterator_c::direction_out ||
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PARAM_DIRECTION == function_param_iterator_c::direction_inout) &&
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PARAM_VALUE != NULL) {
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s4o.print(s4o.indent_spaces);
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PARAM_TYPE->accept(*this);
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s4o.print(" ");
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s4o.print(TEMP_VAR);
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PARAM_NAME->accept(*this);
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s4o.print(" = ");
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print_check_function(PARAM_TYPE, PARAM_VALUE);
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s4o.print(";\n");
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}
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}
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s4o.print(s4o.indent_spaces + INLINE_RESULT_TEMP_VAR),
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s4o.print(" = ");
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function_name->accept(*this);
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s4o.print("(");
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s4o.indent_right();
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PARAM_LIST_ITERATOR() {
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if (pt != param_list.begin())
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s4o.print(",\n" + s4o.indent_spaces);
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if (PARAM_DIRECTION == function_param_iterator_c::direction_in)
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PARAM_NAME->accept(*this);
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else if (PARAM_VALUE != NULL){
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s4o.print("&");
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s4o.print(TEMP_VAR);
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PARAM_NAME->accept(*this);
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}
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else {
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s4o.print("NULL");
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}
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}
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s4o.print(");\n");
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s4o.indent_left();
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PARAM_LIST_ITERATOR() {
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if ((PARAM_DIRECTION == function_param_iterator_c::direction_out ||
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PARAM_DIRECTION == function_param_iterator_c::direction_inout) &&
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PARAM_VALUE != NULL) {
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s4o.print(s4o.indent_spaces);
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unsigned int vartype = search_varfb_instance_type->get_vartype(PARAM_VALUE);
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if (vartype == search_var_instance_decl_c::external_vt)
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s4o.print(SET_EXTERNAL);
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else if (vartype == search_var_instance_decl_c::located_vt)
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s4o.print(SET_LOCATED);
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else
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s4o.print(SET_VAR);
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s4o.print("(");
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PARAM_VALUE->accept(*this);
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s4o.print(", ");
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print_check_function(PARAM_TYPE, PARAM_NAME, NULL, true);
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s4o.print(");\n");
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}
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}
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s4o.print(s4o.indent_spaces + "return ");
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s4o.print(INLINE_RESULT_TEMP_VAR);
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s4o.print(";\n");
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s4o.indent_left();
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s4o.print(s4o.indent_spaces + "}\n\n");
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return NULL;
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}
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private:
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/*********************/
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/* B 1.4 - Variables */
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/*********************/
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void *visit(symbolic_variable_c *symbol) {
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unsigned int vartype = search_varfb_instance_type->get_vartype(symbol);
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if (vartype == search_var_instance_decl_c::external_vt) {
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s4o.print(GET_EXTERNAL);
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s4o.print("(");
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symbol->var_name->accept(*this);
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}
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else {
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if (vartype == search_var_instance_decl_c::located_vt)
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s4o.print(GET_LOCATED);
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else
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s4o.print(GET_VAR);
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s4o.print("(");
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generate_c_base_c::visit(symbol);
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}
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s4o.print(")");
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return NULL;
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}
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/********************************************/
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/* B.1.4.1 Directly Represented Variables */
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/********************************************/
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// direct_variable: direct_variable_token {$$ = new direct_variable_c($1);};
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void *visit(direct_variable_c *symbol) {
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TRACE("direct_variable_c");
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/* Do not use print_token() as it will change everything into uppercase */
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if (strlen(symbol->value) == 0) ERROR;
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s4o.print(GET_LOCATED);
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s4o.print("(");
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this->print_variable_prefix();
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s4o.printlocation(symbol->value + 1);
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s4o.print(")");
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return NULL;
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}
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/****************************************/
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/* B.2 - Language IL (Instruction List) */
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/****************************************/
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/***********************************/
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/* B 2.1 Instructions and Operands */
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/***********************************/
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void *visit(il_function_call_c *symbol) {
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function_declaration_c *f_decl = function_symtable.find_value(symbol->function_name);
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if (f_decl != function_symtable.end_value()) {
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DECLARE_PARAM_LIST()
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bool has_output_params = false;
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/* determine the base data type returned by the function being called... */
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search_base_type_c search_base_type;
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symbol_c *return_data_type = (symbol_c *)f_decl->type_name->accept(search_base_type);
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if (NULL == return_data_type) ERROR;
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/* loop through each function parameter, find the value we should pass
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* to it, and then output the c equivalent...
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*/
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function_param_iterator_c fp_iterator(f_decl);
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identifier_c *param_name;
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function_call_param_iterator_c function_call_param_iterator(symbol);
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for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
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symbol_c *param_type = fp_iterator.param_type();
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if (param_type == NULL) ERROR;
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function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
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symbol_c *param_value = NULL;
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/* if it is the first parameter, semantics specifies that we should
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* get the value off the IL default variable!
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*/
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if (1 == i)
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param_value = &this->default_variable_name;
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/* Get the value from a foo(<param_name> = <param_value>) style call */
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/* NOTE: the following line of code is not required in this case, but it doesn't
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* harm to leave it in, as in the case of a non-formal syntax function call,
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* it will always return NULL.
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* We leave it in in case we later decide to merge this part of the code together
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* with the function calling code in generate_c_st_c, which does require
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* the following line...
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*/
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if (param_value == NULL)
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param_value = function_call_param_iterator.search_f(param_name);
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/* Get the value from a foo(<param_value>) style call */
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if (param_value == NULL)
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param_value = function_call_param_iterator.next_nf();
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if (param_value == NULL && param_direction == function_param_iterator_c::direction_in) {
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/* No value given for parameter, so we must use the default... */
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/* First check whether default value specified in function declaration...*/
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param_value = fp_iterator.default_value();
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}
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ADD_PARAM_LIST(param_name, param_value, param_type, fp_iterator.param_direction())
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} /* for(...) */
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PARAM_LIST_ITERATOR() {
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if ((PARAM_DIRECTION == function_param_iterator_c::direction_out ||
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PARAM_DIRECTION == function_param_iterator_c::direction_inout) &&
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PARAM_VALUE != NULL) {
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has_output_params = true;
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}
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}
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if (has_output_params)
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generate_inline(symbol->function_name, return_data_type, param_list);
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CLEAR_PARAM_LIST()
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}
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return NULL;
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}
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void *visit(il_formal_funct_call_c *symbol) {
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function_declaration_c *f_decl = function_symtable.find_value(symbol->function_name);
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if (f_decl != function_symtable.end_value()) {
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DECLARE_PARAM_LIST()
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bool has_output_params = false;
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/* determine the base data type returned by the function being called... */
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search_base_type_c search_base_type;
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symbol_c *return_data_type = (symbol_c *)f_decl->type_name->accept(search_base_type);
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if (NULL == return_data_type) ERROR;
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/* loop through each function parameter, find the value we should pass
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* to it, and then output the c equivalent...
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*/
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function_param_iterator_c fp_iterator(f_decl);
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identifier_c *param_name;
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function_call_param_iterator_c function_call_param_iterator(symbol);
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for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
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symbol_c *param_type = fp_iterator.param_type();
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if (param_type == NULL) ERROR;
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function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
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symbol_c *param_value = NULL;
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/* Get the value from a foo(<param_name> = <param_value>) style call */
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if (param_value == NULL)
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param_value = function_call_param_iterator.search_f(param_name);
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/* Get the value from a foo(<param_value>) style call */
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/* NOTE: the following line of code is not required in this case, but it doesn't
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* harm to leave it in, as in the case of a formal syntax function call,
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* it will always return NULL.
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* We leave it in in case we later decide to merge this part of the code together
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340 |
* with the function calling code in generate_c_st_c, which does require
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* the following line...
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*/
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343 |
if (param_value == NULL)
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param_value = function_call_param_iterator.next_nf();
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if (param_value == NULL) {
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/* No value given for parameter, so we must use the default... */
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348 |
/* First check whether default value specified in function declaration...*/
|
|
|
349 |
param_value = fp_iterator.default_value();
|
|
|
350 |
}
|
|
|
351 |
|
|
|
352 |
ADD_PARAM_LIST(param_name, param_value, param_type, fp_iterator.param_direction())
|
|
|
353 |
}
|
|
|
354 |
|
|
|
355 |
PARAM_LIST_ITERATOR() {
|
|
|
356 |
if ((PARAM_DIRECTION == function_param_iterator_c::direction_out ||
|
|
|
357 |
PARAM_DIRECTION == function_param_iterator_c::direction_inout) &&
|
|
|
358 |
PARAM_VALUE != NULL) {
|
|
|
359 |
has_output_params = true;
|
|
|
360 |
}
|
|
|
361 |
}
|
|
|
362 |
|
|
|
363 |
if (has_output_params)
|
|
|
364 |
generate_inline(symbol->function_name, return_data_type, param_list);
|
|
|
365 |
|
|
|
366 |
CLEAR_PARAM_LIST()
|
|
|
367 |
}
|
|
|
368 |
return NULL;
|
|
|
369 |
}
|
|
|
370 |
|
|
|
371 |
/***************************************/
|
|
|
372 |
/* B.3 - Language ST (Structured Text) */
|
|
|
373 |
/***************************************/
|
|
|
374 |
/***********************/
|
|
|
375 |
/* B 3.1 - Expressions */
|
|
|
376 |
/***********************/
|
|
|
377 |
|
|
|
378 |
void *visit(function_invocation_c *symbol) {
|
|
|
379 |
function_declaration_c *f_decl = function_symtable.find_value(symbol->function_name);
|
|
|
380 |
|
|
|
381 |
if (f_decl != function_symtable.end_value()) {
|
|
|
382 |
DECLARE_PARAM_LIST()
|
|
|
383 |
bool has_output_params = false;
|
|
|
384 |
|
|
|
385 |
symbol_c *parameter_assignment_list = NULL;
|
|
|
386 |
if (NULL != symbol-> formal_param_list) parameter_assignment_list = symbol-> formal_param_list;
|
|
|
387 |
if (NULL != symbol->nonformal_param_list) parameter_assignment_list = symbol->nonformal_param_list;
|
|
|
388 |
if (NULL == parameter_assignment_list) ERROR;
|
|
|
389 |
|
|
|
390 |
/* determine the base data type returned by the function being called... */
|
|
|
391 |
search_base_type_c search_base_type;
|
|
|
392 |
symbol_c *return_data_type = (symbol_c *)f_decl->type_name->accept(search_base_type);
|
|
|
393 |
if (NULL == return_data_type) ERROR;
|
|
|
394 |
|
|
|
395 |
/* loop through each function parameter, find the value we should pass
|
|
|
396 |
* to it, and then output the c equivalent...
|
|
|
397 |
*/
|
|
|
398 |
function_param_iterator_c fp_iterator(f_decl);
|
|
|
399 |
identifier_c *param_name;
|
|
|
400 |
function_call_param_iterator_c function_call_param_iterator(symbol);
|
|
|
401 |
for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
|
|
|
402 |
|
|
|
403 |
function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
|
|
|
404 |
|
|
|
405 |
/* Get the value from a foo(<param_name> = <param_value>) style call */
|
|
|
406 |
symbol_c *param_value = function_call_param_iterator.search_f(param_name);
|
|
|
407 |
|
|
|
408 |
/* Get the value from a foo(<param_value>) style call */
|
|
|
409 |
if (param_value == NULL)
|
|
|
410 |
param_value = function_call_param_iterator.next_nf();
|
|
|
411 |
|
|
|
412 |
if (param_value == NULL && param_direction == function_param_iterator_c::direction_in) {
|
|
|
413 |
/* No value given for parameter, so we must use the default... */
|
|
|
414 |
/* First check whether default value specified in function declaration...*/
|
|
|
415 |
param_value = fp_iterator.default_value();
|
|
|
416 |
}
|
|
|
417 |
|
|
|
418 |
symbol_c *param_type = fp_iterator.param_type();
|
|
|
419 |
if (param_type == NULL) ERROR;
|
|
|
420 |
|
|
|
421 |
ADD_PARAM_LIST(param_name, param_value, param_type, param_direction)
|
|
|
422 |
} /* for(...) */
|
|
|
423 |
// symbol->parameter_assignment->accept(*this);
|
|
|
424 |
|
|
|
425 |
PARAM_LIST_ITERATOR() {
|
|
|
426 |
if ((PARAM_DIRECTION == function_param_iterator_c::direction_out ||
|
|
|
427 |
PARAM_DIRECTION == function_param_iterator_c::direction_inout) &&
|
|
|
428 |
PARAM_VALUE != NULL) {
|
|
|
429 |
has_output_params = true;
|
|
|
430 |
}
|
|
|
431 |
}
|
|
|
432 |
|
|
|
433 |
if (has_output_params)
|
|
|
434 |
generate_inline(symbol->function_name, return_data_type, param_list);
|
|
|
435 |
|
|
|
436 |
CLEAR_PARAM_LIST()
|
|
|
437 |
}
|
|
|
438 |
return NULL;
|
|
|
439 |
}
|
|
|
440 |
|
|
|
441 |
}; /* generate_c_inline_c */
|
|
|
442 |
|
|
|
443 |
|
|
|
444 |
/***********************************************************************/
|
|
|
445 |
/***********************************************************************/
|
|
|
446 |
/***********************************************************************/
|
|
|
447 |
/***********************************************************************/
|
|
|
448 |
|
|
|
449 |
|
|
|
450 |
class generate_c_inlinefcall_c: public iterator_visitor_c {
|
|
|
451 |
|
|
|
452 |
private:
|
|
|
453 |
generate_c_inline_c *generate_c_inline;
|
|
|
454 |
|
|
|
455 |
public:
|
|
|
456 |
generate_c_inlinefcall_c(stage4out_c *s4o_ptr, symbol_c *name, symbol_c *scope, const char *variable_prefix = NULL) {
|
|
|
457 |
generate_c_inline = new generate_c_inline_c(s4o_ptr, name, scope, variable_prefix);
|
|
|
458 |
}
|
|
|
459 |
|
|
|
460 |
virtual ~generate_c_inlinefcall_c(void) {
|
|
|
461 |
delete generate_c_inline;
|
|
|
462 |
}
|
|
|
463 |
|
|
|
464 |
private:
|
|
|
465 |
|
|
|
466 |
void *visit(function_invocation_c *symbol) {
|
|
|
467 |
return symbol->accept(*generate_c_inline);
|
|
|
468 |
}
|
|
|
469 |
|
|
|
470 |
void *visit(il_function_call_c *symbol) {
|
|
|
471 |
return symbol->accept(*generate_c_inline);
|
|
|
472 |
}
|
|
|
473 |
|
|
|
474 |
void *visit(il_formal_funct_call_c *symbol) {
|
|
|
475 |
return symbol->accept(*generate_c_inline);
|
|
|
476 |
}
|
|
|
477 |
}; /* generate_c_inlinefcall_c */
|
|
|
478 |
|
|
|
479 |
|
|
|
480 |
|