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/*
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* (c) 2003 Mario de Sousa
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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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* Conversion of st statements (i.e. ST code).
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*
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* This is part of the 4th stage that generates
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* a c++ source program equivalent to the IL and ST
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* code.
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*/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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class generate_c_st_c: public generate_c_typedecl_c {
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private:
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/* When calling a function block, we must first find it's type,
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* by searching through the declarations of the variables currently
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* in scope.
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* This class does just that...
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* A new class is instantiated whenever we begin generating the code
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* for a function block type declaration, or a program declaration.
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* This object instance will then later be called while the
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* function block's or the program's body is being handled.
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*
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* Note that functions cannot contain calls to function blocks,
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* so we do not create an object instance when handling
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* a function declaration.
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*/
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search_fb_instance_decl_c *search_fb_instance_decl;
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/* When compiling st code, it becomes necessary to determine the
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* data type of st expressions. To do this, we must first find the
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* st operand's declaration, within the scope of the function block
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* or function currently being processed.
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* The following object does just that...
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* This object instance will then later be called while the
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* remaining st code is being handled.
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*/
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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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public:
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generate_c_st_c(stage4out_c *s4o_ptr, symbol_c *scope, const char *variable_prefix = NULL)
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: generate_c_typedecl_c(s4o_ptr) {
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search_fb_instance_decl = new search_fb_instance_decl_c(scope);
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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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}
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virtual ~generate_c_st_c(void) {
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delete search_fb_instance_decl;
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delete search_expression_type;
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delete search_varfb_instance_type;
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}
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private:
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/* Some function calls in the body of functions or function blocks
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* may leave some parameters to their default values, and
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* ignore some output parameters of the function being called.
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* Our conversion of ST functions to C++ does not contemplate that,
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* i.e. each called function must get all it's input and output
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* parameters set correctly.
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* For input parameters we merely need to call the function with
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* the apropriate default value, but for output parameters
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* we must create temporary variables to hold the output value.
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*
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* We declare all the temporary output variables at the begining of
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* the body of each function or function block, and use them as
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* in function calls later on as they become necessary...
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* Note that we cannot create these variables just before a function
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* call, as the function call itself may be integrated within an
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* expression, or another function call!
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*
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* The variables are declared in the exact same order in which they
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* will be used later on during the function calls, which allows us
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* to simply re-create the name that was used for the temporary variable
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* instead of keeping it in some list.
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* The names are recreated by the temp_var_name_factory, after reset()
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* has been called!
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*
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* This function will genertae code similar to...
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*
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* INT __TMP_0 = 23;
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* REAL __TMP_1 = 45.5;
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* ...
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*/
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temp_var_name_c temp_var_name_factory;
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public:
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void generate(statement_list_c *stl) {
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generate_c_tempvardecl_c generate_c_tempvardecl(&s4o);
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generate_c_tempvardecl.generate(stl, &temp_var_name_factory);
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stl->accept(*this);
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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 || vartype == search_var_instance_decl_c::located_vt) {
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s4o.print("*(");
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generate_c_base_c::visit(symbol);
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s4o.print(")");
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}
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else {
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generate_c_base_c::visit(symbol);
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}
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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("*(");
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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.3 - Language ST (Structured Text) */
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/***************************************/
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/***********************/
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/* B 3.1 - Expressions */
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/***********************/
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void *visit(or_expression_c *symbol) {
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symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
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symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
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if (!search_expression_type->is_same_type(left_type, right_type))
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ERROR;
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if (search_expression_type->is_bool_type(left_type))
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return print_binary_expression(symbol->l_exp, symbol->r_exp, " || ");
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if (search_expression_type->is_binary_type(left_type))
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return print_binary_expression(symbol->l_exp, symbol->r_exp, " | ");
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ERROR;
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return NULL;
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}
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void *visit(xor_expression_c *symbol) {
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symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
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symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
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if (!search_expression_type->is_same_type(left_type, right_type))
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ERROR;
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if (search_expression_type->is_bool_type(left_type)) {
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s4o.print("(");
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symbol->l_exp->accept(*this);
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s4o.print(" && !");
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symbol->r_exp->accept(*this);
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s4o.print(") || (!");
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symbol->l_exp->accept(*this);
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s4o.print(" && ");
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symbol->r_exp->accept(*this);
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s4o.print(")");
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}
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if (search_expression_type->is_binary_type(left_type))
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return print_binary_expression(symbol->l_exp, symbol->r_exp, " ^ ");
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ERROR;
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return NULL;
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}
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void *visit(and_expression_c *symbol) {
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symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
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symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
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if (!search_expression_type->is_same_type(left_type, right_type))
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ERROR;
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if (search_expression_type->is_bool_type(left_type))
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return print_binary_expression(symbol->l_exp, symbol->r_exp, " && ");
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if (search_expression_type->is_binary_type(left_type))
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return print_binary_expression(symbol->l_exp, symbol->r_exp, " & ");
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ERROR;
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return NULL;
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}
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void *visit(equ_expression_c *symbol) {
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symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
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symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
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if (!search_expression_type->is_same_type(left_type, right_type))
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ERROR;
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if (search_expression_type->is_time_type(left_type))
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return print_compare_function("__eq_", left_type, symbol->l_exp, symbol->r_exp);
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return print_binary_expression(symbol->l_exp, symbol->r_exp, " == ");
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}
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void *visit(notequ_expression_c *symbol) {
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symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
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symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
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if (!search_expression_type->is_same_type(left_type, right_type))
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ERROR;
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if (search_expression_type->is_time_type(left_type))
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return print_compare_function("__ne_", left_type, symbol->l_exp, symbol->r_exp);
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return print_binary_expression(symbol->l_exp, symbol->r_exp, " != ");
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}
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void *visit(lt_expression_c *symbol) {
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symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
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symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
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if (!search_expression_type->is_same_type(left_type, right_type))
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ERROR;
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if (search_expression_type->is_time_type(left_type))
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return print_compare_function("__lt_", left_type, symbol->l_exp, symbol->r_exp);
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return print_binary_expression(symbol->l_exp, symbol->r_exp, " < ");
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}
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void *visit(gt_expression_c *symbol) {
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symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
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symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
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if (!search_expression_type->is_same_type(left_type, right_type))
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ERROR;
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if (search_expression_type->is_time_type(left_type))
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return print_compare_function("__gt_", left_type, symbol->l_exp, symbol->r_exp);
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return print_binary_expression(symbol->l_exp, symbol->r_exp, " > ");
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}
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void *visit(le_expression_c *symbol) {
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symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
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symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
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if (!search_expression_type->is_same_type(left_type, right_type))
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ERROR;
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if (search_expression_type->is_time_type(left_type))
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return print_compare_function("__le_", left_type, symbol->l_exp, symbol->r_exp);
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return print_binary_expression(symbol->l_exp, symbol->r_exp, " <= ");
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}
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void *visit(ge_expression_c *symbol) {
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symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
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symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
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if (!search_expression_type->is_same_type(left_type, right_type))
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ERROR;
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if (search_expression_type->is_time_type(left_type))
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return print_compare_function("__ge_", left_type, symbol->l_exp, symbol->r_exp);
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return print_binary_expression(symbol->l_exp, symbol->r_exp, " >= ");
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}
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void *visit(add_expression_c *symbol) {
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symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
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symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
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if ((typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) ||
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(typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) ||
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(typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)))
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return print_binary_function("__time_add", symbol->l_exp, symbol->r_exp);
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if (!search_expression_type->is_same_type(left_type, right_type))
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ERROR;
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if (search_expression_type->is_integer_type(left_type) || search_expression_type->is_real_type(left_type))
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return print_binary_expression(symbol->l_exp, symbol->r_exp, " + ");
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ERROR;
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return NULL;
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}
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void *visit(sub_expression_c *symbol) {
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symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
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symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
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if ((typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) ||
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(typeid(*left_type) == typeid(date_type_name_c) && typeid(*right_type) == typeid(date_type_name_c)) ||
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(typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) ||
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(typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(tod_type_name_c)) ||
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(typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) ||
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(typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(dt_type_name_c)))
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return print_binary_function("__time_sub", symbol->l_exp, symbol->r_exp);
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if (!search_expression_type->is_same_type(left_type, right_type))
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ERROR;
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if (search_expression_type->is_integer_type(left_type) || search_expression_type->is_real_type(left_type))
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return print_binary_expression(symbol->l_exp, symbol->r_exp, " - ");
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ERROR;
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return NULL;
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}
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void *visit(mul_expression_c *symbol) {
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symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
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|
309 |
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
|
|
|
310 |
if ((typeid(*left_type) == typeid(time_type_name_c) && search_expression_type->is_integer_type(right_type)) ||
|
|
|
311 |
(typeid(*left_type) == typeid(time_type_name_c) && search_expression_type->is_real_type(right_type)))
|
|
|
312 |
return print_binary_function("__time_mul", symbol->l_exp, symbol->r_exp);
|
|
|
313 |
if (!search_expression_type->is_same_type(left_type, right_type))
|
|
|
314 |
ERROR;
|
|
|
315 |
if (search_expression_type->is_integer_type(left_type) || search_expression_type->is_real_type(left_type))
|
|
|
316 |
return print_binary_expression(symbol->l_exp, symbol->r_exp, " * ");
|
|
|
317 |
ERROR;
|
|
|
318 |
return NULL;
|
|
|
319 |
}
|
|
|
320 |
|
|
|
321 |
void *visit(div_expression_c *symbol) {
|
|
|
322 |
symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
|
|
|
323 |
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
|
|
|
324 |
if (!search_expression_type->is_same_type(left_type, right_type))
|
|
|
325 |
ERROR;
|
|
|
326 |
if (search_expression_type->is_integer_type(left_type) || search_expression_type->is_real_type(left_type))
|
|
|
327 |
return print_binary_expression(symbol->l_exp, symbol->r_exp, " / ");
|
|
|
328 |
ERROR;
|
|
|
329 |
return NULL;
|
|
|
330 |
}
|
|
|
331 |
|
|
|
332 |
void *visit(mod_expression_c *symbol) {
|
|
|
333 |
symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
|
|
|
334 |
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
|
|
|
335 |
if (!search_expression_type->is_same_type(left_type, right_type))
|
|
|
336 |
ERROR;
|
|
|
337 |
if (search_expression_type->is_integer_type(left_type) || search_expression_type->is_real_type(left_type)) {
|
|
|
338 |
s4o.print("((");
|
|
|
339 |
symbol->r_exp->accept(*this);
|
|
|
340 |
s4o.print(" == 0)?0:");
|
|
|
341 |
print_binary_expression(symbol->l_exp, symbol->r_exp, " % ");
|
|
|
342 |
s4o.print(")");
|
|
|
343 |
return NULL;
|
|
|
344 |
}
|
|
|
345 |
ERROR;
|
|
|
346 |
return NULL;
|
|
|
347 |
}
|
|
|
348 |
|
|
|
349 |
/* TODO: power expression... */
|
|
|
350 |
void *visit(power_expression_c *symbol) {ERROR; return print_binary_expression(symbol->l_exp, symbol->r_exp, " ** ");}
|
|
|
351 |
void *visit(neg_expression_c *symbol) {return print_unary_expression(symbol->exp, " -");}
|
|
|
352 |
|
|
|
353 |
void *visit(not_expression_c *symbol) {
|
|
|
354 |
symbol_c *exp_type = search_expression_type->get_type(symbol->exp);
|
|
|
355 |
if (!search_expression_type->is_binary_type(exp_type))
|
|
|
356 |
ERROR;
|
|
|
357 |
return print_unary_expression(symbol->exp, search_expression_type->is_bool_type(exp_type)?"!":"~");
|
|
|
358 |
}
|
|
|
359 |
|
|
|
360 |
void *visit(function_invocation_c *symbol) {
|
|
|
361 |
function_declaration_c *f_decl = function_symtable.find_value(symbol->function_name);
|
|
|
362 |
|
|
|
363 |
if (f_decl == function_symtable.end_value()) {
|
|
|
364 |
/* The function called is not in the symtable, so we test if it is a
|
|
|
365 |
* standard function defined in standard */
|
|
|
366 |
|
|
|
367 |
function_type_t current_function_type = get_function_type((identifier_c *)symbol->function_name);
|
|
|
368 |
if (current_function_type == function_none) ERROR;
|
|
|
369 |
|
|
|
370 |
symbol_c *function_return_type = search_expression_type->get_type(symbol);
|
|
|
371 |
|
|
|
372 |
function_call_param_iterator_c function_call_param_iterator(symbol);
|
|
|
373 |
|
|
|
374 |
int nb_param = ((list_c *)symbol->parameter_assignment_list)->n;
|
|
|
375 |
|
|
|
376 |
#include "st_code_gen.c"
|
|
|
377 |
|
|
|
378 |
#if 0
|
|
|
379 |
for(int current_param = 0; current_param < nb_param; current_param++) {
|
|
|
380 |
symbol_c *param_name = NULL;
|
|
|
381 |
switch (current_function_type) {
|
|
|
382 |
case function_add:
|
|
|
383 |
case function_and:
|
|
|
384 |
case function_or:
|
|
|
385 |
param_name = generate_param_name("IN%d", current_param + 1);
|
|
|
386 |
break;
|
|
|
387 |
case function_sub:
|
|
|
388 |
if (current_param < 2)
|
|
|
389 |
param_name = generate_param_name("IN%d", current_param + 1);
|
|
|
390 |
else
|
|
|
391 |
ERROR;
|
|
|
392 |
break;
|
|
|
393 |
default: ERROR;
|
|
|
394 |
}
|
|
|
395 |
|
|
|
396 |
/* Get the value from a foo(<param_name> = <param_value>) style call */
|
|
|
397 |
symbol_c *param_value = function_call_param_iterator.search(param_name);
|
|
|
398 |
delete param_name;
|
|
|
399 |
|
|
|
400 |
/* Get the value from a foo(<param_value>) style call */
|
|
|
401 |
if (param_value == NULL)
|
|
|
402 |
param_value = function_call_param_iterator.next();
|
|
|
403 |
|
|
|
404 |
if (param_value == NULL) ERROR;
|
|
|
405 |
|
|
|
406 |
switch (current_function_type) {
|
|
|
407 |
case function_add:
|
|
|
408 |
if (search_expression_type->is_time_type(function_return_type)) {
|
|
|
409 |
if (current_param == 0) {
|
|
|
410 |
s4o.print("__time_add(");
|
|
|
411 |
param_value->accept(*this);
|
|
|
412 |
}
|
|
|
413 |
else if (current_param == 1) {
|
|
|
414 |
s4o.print(", ");
|
|
|
415 |
param_value->accept(*this);
|
|
|
416 |
s4o.print(")");
|
|
|
417 |
}
|
|
|
418 |
else ERROR;
|
|
|
419 |
}
|
|
|
420 |
else {
|
|
|
421 |
if (current_param == 0)
|
|
|
422 |
s4o.print("(");
|
|
|
423 |
else
|
|
|
424 |
s4o.print(" + ");
|
|
|
425 |
param_value->accept(*this);
|
|
|
426 |
if (current_param == nb_param - 1)
|
|
|
427 |
s4o.print(")");
|
|
|
428 |
}
|
|
|
429 |
break;
|
|
|
430 |
case function_sub:
|
|
|
431 |
if (search_expression_type->is_time_type(function_return_type)) {
|
|
|
432 |
if (current_param == 0) {
|
|
|
433 |
s4o.print("__time_sub(");
|
|
|
434 |
param_value->accept(*this);
|
|
|
435 |
}
|
|
|
436 |
else if (current_param == 1) {
|
|
|
437 |
s4o.print(", ");
|
|
|
438 |
param_value->accept(*this);
|
|
|
439 |
s4o.print(")");
|
|
|
440 |
}
|
|
|
441 |
else ERROR;
|
|
|
442 |
}
|
|
|
443 |
else {
|
|
|
444 |
if (current_param == 0) {
|
|
|
445 |
s4o.print("(");
|
|
|
446 |
param_value->accept(*this);
|
|
|
447 |
}
|
|
|
448 |
else if (current_param == 1) {
|
|
|
449 |
s4o.print(" - ");
|
|
|
450 |
param_value->accept(*this);
|
|
|
451 |
s4o.print(")");
|
|
|
452 |
}
|
|
|
453 |
else ERROR;
|
|
|
454 |
}
|
|
|
455 |
break;
|
|
|
456 |
case function_and:
|
|
|
457 |
if (current_param == 0)
|
|
|
458 |
s4o.print("(");
|
|
|
459 |
else
|
|
|
460 |
if (search_expression_type->is_bool_type(function_return_type))
|
|
|
461 |
s4o.print(" && ");
|
|
|
462 |
else
|
|
|
463 |
s4o.print(" & ");
|
|
|
464 |
param_value->accept(*this);
|
|
|
465 |
if (current_param == nb_param - 1)
|
|
|
466 |
s4o.print(")");
|
|
|
467 |
break;
|
|
|
468 |
case function_or:
|
|
|
469 |
if (current_param == 0)
|
|
|
470 |
s4o.print("(");
|
|
|
471 |
else
|
|
|
472 |
if (search_expression_type->is_bool_type(function_return_type))
|
|
|
473 |
s4o.print(" || ");
|
|
|
474 |
else
|
|
|
475 |
s4o.print(" | ");
|
|
|
476 |
param_value->accept(*this);
|
|
|
477 |
if (current_param == nb_param - 1)
|
|
|
478 |
s4o.print(")");
|
|
|
479 |
break;
|
|
|
480 |
default: ERROR;
|
|
|
481 |
}
|
|
|
482 |
} /* for(...) */
|
|
|
483 |
#endif
|
|
|
484 |
}
|
|
|
485 |
else {
|
|
|
486 |
/* loop through each function parameter, find the value we should pass
|
|
|
487 |
* to it, and then output the c equivalent...
|
|
|
488 |
*/
|
|
|
489 |
function_param_iterator_c fp_iterator(f_decl);
|
|
|
490 |
|
|
|
491 |
symbol->function_name->accept(*this);
|
|
|
492 |
s4o.print("(");
|
|
|
493 |
s4o.indent_right();
|
|
|
494 |
|
|
|
495 |
identifier_c *param_name;
|
|
|
496 |
function_call_param_iterator_c function_call_param_iterator(symbol);
|
|
|
497 |
for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
|
|
|
498 |
if (i != 1)
|
|
|
499 |
s4o.print(",\n"+s4o.indent_spaces);
|
|
|
500 |
|
|
|
501 |
function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
|
|
|
502 |
|
|
|
503 |
/* Get the value from a foo(<param_name> = <param_value>) style call */
|
|
|
504 |
symbol_c *param_value = function_call_param_iterator.search(param_name);
|
|
|
505 |
|
|
|
506 |
/* Get the value from a foo(<param_value>) style call */
|
|
|
507 |
if (param_value == NULL)
|
|
|
508 |
param_value = function_call_param_iterator.next();
|
|
|
509 |
|
|
|
510 |
symbol_c *param_type = fp_iterator.param_type();
|
|
|
511 |
if (param_type == NULL) ERROR;
|
|
|
512 |
|
|
|
513 |
switch (param_direction) {
|
|
|
514 |
case function_param_iterator_c::direction_in:
|
|
|
515 |
if (param_value == NULL) {
|
|
|
516 |
/* No value given for parameter, so we must use the default... */
|
|
|
517 |
/* First check whether default value specified in function declaration...*/
|
|
|
518 |
param_value = fp_iterator.default_value();
|
|
|
519 |
}
|
|
|
520 |
if (param_value == NULL) {
|
|
|
521 |
/* If not, get the default value of this variable's type */
|
|
|
522 |
param_value = (symbol_c *)param_type->accept(*type_initial_value_c::instance());
|
|
|
523 |
}
|
|
|
524 |
if (param_value == NULL) ERROR;
|
|
|
525 |
param_value->accept(*this);
|
|
|
526 |
break;
|
|
|
527 |
case function_param_iterator_c::direction_out:
|
|
|
528 |
case function_param_iterator_c::direction_inout:
|
|
|
529 |
if (param_value == NULL) {
|
|
|
530 |
/* no parameter value given, so we pass a previously declared temporary variable. */
|
|
|
531 |
std::string *temp_var_name = temp_var_name_factory.new_name();
|
|
|
532 |
s4o.print(*temp_var_name);
|
|
|
533 |
delete temp_var_name;
|
|
|
534 |
} else {
|
|
|
535 |
param_value->accept(*this);
|
|
|
536 |
}
|
|
|
537 |
break;
|
|
|
538 |
case function_param_iterator_c::direction_extref:
|
|
|
539 |
/* TODO! */
|
|
|
540 |
ERROR;
|
|
|
541 |
break;
|
|
|
542 |
} /* switch */
|
|
|
543 |
} /* for(...) */
|
|
|
544 |
// symbol->parameter_assignment->accept(*this);
|
|
|
545 |
s4o.print(")");
|
|
|
546 |
s4o.indent_left();
|
|
|
547 |
}
|
|
|
548 |
|
|
|
549 |
return NULL;
|
|
|
550 |
}
|
|
|
551 |
|
|
|
552 |
/********************/
|
|
|
553 |
/* B 3.2 Statements */
|
|
|
554 |
/********************/
|
|
|
555 |
void *visit(statement_list_c *symbol) {
|
|
|
556 |
return print_list(symbol, s4o.indent_spaces, ";\n" + s4o.indent_spaces, ";\n");
|
|
|
557 |
}
|
|
|
558 |
|
|
|
559 |
/*********************************/
|
|
|
560 |
/* B 3.2.1 Assignment Statements */
|
|
|
561 |
/*********************************/
|
|
|
562 |
void *visit(assignment_statement_c *symbol) {
|
|
|
563 |
symbol->l_exp->accept(*this);
|
|
|
564 |
s4o.print(" = ");
|
|
|
565 |
symbol->r_exp->accept(*this);
|
|
|
566 |
return NULL;
|
|
|
567 |
}
|
|
|
568 |
|
|
|
569 |
/*****************************************/
|
|
|
570 |
/* B 3.2.2 Subprogram Control Statements */
|
|
|
571 |
/*****************************************/
|
|
|
572 |
|
|
|
573 |
/* fb_name '(' [param_assignment_list] ')' */
|
|
|
574 |
/* param_assignment_list -> may be NULL ! */
|
|
|
575 |
//SYM_REF2(fb_invocation_c, fb_name, param_assignment_list)
|
|
|
576 |
void *visit(fb_invocation_c *symbol) {
|
|
|
577 |
TRACE("fb_invocation_c");
|
|
|
578 |
/* first figure out what is the name of the function block type of the function block being called... */
|
|
|
579 |
symbol_c *function_block_type_name = this->search_fb_instance_decl->get_type_name(symbol->fb_name);
|
|
|
580 |
/* should never occur. The function block instance MUST have been declared... */
|
|
|
581 |
if (function_block_type_name == NULL) ERROR;
|
|
|
582 |
|
|
|
583 |
/* Now find the declaration of the function block type being called... */
|
|
|
584 |
function_block_declaration_c *fb_decl = function_block_type_symtable.find_value(function_block_type_name);
|
|
|
585 |
/* should never occur. The function block type being called MUST be in the symtable... */
|
|
|
586 |
if (fb_decl == function_block_type_symtable.end_value()) ERROR;
|
|
|
587 |
|
|
|
588 |
/* loop through each function block parameter, find the value we should pass
|
|
|
589 |
* to it, and then output the c equivalent...
|
|
|
590 |
*/
|
|
|
591 |
function_param_iterator_c fp_iterator(fb_decl);
|
|
|
592 |
identifier_c *param_name;
|
|
|
593 |
function_call_param_iterator_c function_call_param_iterator(symbol);
|
|
|
594 |
for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
|
|
|
595 |
function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
|
|
|
596 |
|
|
|
597 |
/* Get the value from a foo(<param_name> = <param_value>) style call */
|
|
|
598 |
symbol_c *param_value = function_call_param_iterator.search(param_name);
|
|
|
599 |
|
|
|
600 |
/* Get the value from a foo(<param_value>) style call */
|
|
|
601 |
if (param_value == NULL)
|
|
|
602 |
param_value = function_call_param_iterator.next();
|
|
|
603 |
|
|
|
604 |
/* now output the value assignment */
|
|
|
605 |
if (param_value != NULL)
|
|
|
606 |
if ((param_direction == function_param_iterator_c::direction_in) ||
|
|
|
607 |
(param_direction == function_param_iterator_c::direction_inout)) {
|
|
|
608 |
print_variable_prefix();
|
|
|
609 |
symbol->fb_name->accept(*this);
|
|
|
610 |
s4o.print(".");
|
|
|
611 |
param_name->accept(*this);
|
|
|
612 |
s4o.print(" = ");
|
|
|
613 |
param_value->accept(*this);
|
|
|
614 |
s4o.print(";\n" + s4o.indent_spaces);
|
|
|
615 |
}
|
|
|
616 |
} /* for(...) */
|
|
|
617 |
|
|
|
618 |
/* now call the function... */
|
|
|
619 |
function_block_type_name->accept(*this);
|
|
|
620 |
s4o.print(FB_FUNCTION_SUFFIX);
|
|
|
621 |
s4o.print("(&");
|
|
|
622 |
print_variable_prefix();
|
|
|
623 |
symbol->fb_name->accept(*this);
|
|
|
624 |
s4o.print(")");
|
|
|
625 |
|
|
|
626 |
/* loop through each function parameter, find the variable to which
|
|
|
627 |
* we should atribute the value of all output or inoutput parameters.
|
|
|
628 |
*/
|
|
|
629 |
fp_iterator.reset();
|
|
|
630 |
function_call_param_iterator.reset();
|
|
|
631 |
for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
|
|
|
632 |
function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
|
|
|
633 |
|
|
|
634 |
/* Get the value from a foo(<param_name> = <param_value>) style call */
|
|
|
635 |
symbol_c *param_value = function_call_param_iterator.search(param_name);
|
|
|
636 |
|
|
|
637 |
/* Get the value from a foo(<param_value>) style call */
|
|
|
638 |
if (param_value == NULL)
|
|
|
639 |
param_value = function_call_param_iterator.next();
|
|
|
640 |
|
|
|
641 |
/* now output the value assignment */
|
|
|
642 |
if (param_value != NULL)
|
|
|
643 |
if ((param_direction == function_param_iterator_c::direction_out) ||
|
|
|
644 |
(param_direction == function_param_iterator_c::direction_inout)) {
|
|
|
645 |
s4o.print(";\n"+ s4o.indent_spaces);
|
|
|
646 |
param_value->accept(*this);
|
|
|
647 |
s4o.print(" = ");
|
|
|
648 |
print_variable_prefix();
|
|
|
649 |
symbol->fb_name->accept(*this);
|
|
|
650 |
s4o.print(".");
|
|
|
651 |
param_name->accept(*this);
|
|
|
652 |
}
|
|
|
653 |
} /* for(...) */
|
|
|
654 |
|
|
|
655 |
return NULL;
|
|
|
656 |
}
|
|
|
657 |
|
|
|
658 |
|
|
|
659 |
|
|
|
660 |
|
|
|
661 |
/* helper symbol for fb_invocation */
|
|
|
662 |
/* param_assignment_list ',' param_assignment */
|
|
|
663 |
void *visit(param_assignment_list_c *symbol) {
|
|
|
664 |
TRACE("param_assignment_list_c");
|
|
|
665 |
/* this should never be called... */
|
|
|
666 |
ERROR;
|
|
|
667 |
return NULL;
|
|
|
668 |
// return print_list(symbol, "", ", ");
|
|
|
669 |
}
|
|
|
670 |
|
|
|
671 |
|
|
|
672 |
void *visit(input_variable_param_assignment_c *symbol) {
|
|
|
673 |
TRACE("input_variable_param_assignment_c");
|
|
|
674 |
/* this should never be called... */
|
|
|
675 |
ERROR;
|
|
|
676 |
return NULL;
|
|
|
677 |
/*
|
|
|
678 |
symbol->variable_name->accept(*this);
|
|
|
679 |
s4o.print(" = ");
|
|
|
680 |
symbol->expression->accept(*this);
|
|
|
681 |
return NULL;
|
|
|
682 |
*/
|
|
|
683 |
}
|
|
|
684 |
|
|
|
685 |
void *visit(output_variable_param_assignment_c *symbol) {
|
|
|
686 |
TRACE("output_variable_param_assignment_c");
|
|
|
687 |
/* this should never be called... */
|
|
|
688 |
ERROR;
|
|
|
689 |
return NULL;
|
|
|
690 |
/*
|
|
|
691 |
s4o.print(s4o.indent_spaces);
|
|
|
692 |
if (symbol->not_param != NULL)
|
|
|
693 |
symbol->not_param->accept(*this);
|
|
|
694 |
symbol->variable_name->accept(*this);
|
|
|
695 |
s4o.print(" => ");
|
|
|
696 |
symbol->variable->accept(*this);
|
|
|
697 |
return NULL;
|
|
|
698 |
*/
|
|
|
699 |
}
|
|
|
700 |
|
|
|
701 |
// TODO: the NOT symbol in function (block) calls...
|
|
|
702 |
void *visit(not_paramassign_c *symbol) {
|
|
|
703 |
TRACE("not_paramassign_c");
|
|
|
704 |
/* this should never be called... */
|
|
|
705 |
ERROR;
|
|
|
706 |
return NULL;
|
|
|
707 |
/*
|
|
|
708 |
s4o.print("NOT ");
|
|
|
709 |
return NULL;
|
|
|
710 |
*/
|
|
|
711 |
}
|
|
|
712 |
|
|
|
713 |
|
|
|
714 |
/********************************/
|
|
|
715 |
/* B 3.2.3 Selection Statements */
|
|
|
716 |
/********************************/
|
|
|
717 |
void *visit(if_statement_c *symbol) {
|
|
|
718 |
s4o.print("if (");
|
|
|
719 |
symbol->expression->accept(*this);
|
|
|
720 |
s4o.print(") {\n");
|
|
|
721 |
s4o.indent_right();
|
|
|
722 |
symbol->statement_list->accept(*this);
|
|
|
723 |
s4o.indent_left();
|
|
|
724 |
symbol->elseif_statement_list->accept(*this);
|
|
|
725 |
|
|
|
726 |
if (symbol->else_statement_list != NULL) {
|
|
|
727 |
s4o.print(s4o.indent_spaces); s4o.print("} else {\n");
|
|
|
728 |
s4o.indent_right();
|
|
|
729 |
symbol->else_statement_list->accept(*this);
|
|
|
730 |
s4o.indent_left();
|
|
|
731 |
}
|
|
|
732 |
s4o.print(s4o.indent_spaces); s4o.print("}");
|
|
|
733 |
return NULL;
|
|
|
734 |
}
|
|
|
735 |
|
|
|
736 |
/* helper symbol for if_statement */
|
|
|
737 |
void *visit(elseif_statement_list_c *symbol) {return print_list(symbol);}
|
|
|
738 |
|
|
|
739 |
/* helper symbol for elseif_statement_list */
|
|
|
740 |
void *visit(elseif_statement_c *symbol) {
|
|
|
741 |
s4o.print(s4o.indent_spaces); s4o.print("} else if (");
|
|
|
742 |
symbol->expression->accept(*this);
|
|
|
743 |
s4o.print(") {\n");
|
|
|
744 |
s4o.indent_right();
|
|
|
745 |
symbol->statement_list->accept(*this);
|
|
|
746 |
s4o.indent_left();
|
|
|
747 |
return NULL;
|
|
|
748 |
}
|
|
|
749 |
|
|
|
750 |
void *visit(case_statement_c *symbol) {
|
|
|
751 |
s4o.print("switch(");
|
|
|
752 |
symbol->expression->accept(*this);
|
|
|
753 |
s4o.print(") {\n");
|
|
|
754 |
s4o.indent_right();
|
|
|
755 |
symbol->case_element_list->accept(*this);
|
|
|
756 |
if (symbol->statement_list != NULL) {
|
|
|
757 |
s4o.print(s4o.indent_spaces + "default:\n");
|
|
|
758 |
s4o.indent_right();
|
|
|
759 |
symbol->statement_list->accept(*this);
|
|
|
760 |
s4o.print(s4o.indent_spaces + "break;\n");
|
|
|
761 |
s4o.indent_left();
|
|
|
762 |
}
|
|
|
763 |
s4o.indent_left();
|
|
|
764 |
s4o.print(s4o.indent_spaces + "}");
|
|
|
765 |
return NULL;
|
|
|
766 |
}
|
|
|
767 |
|
|
|
768 |
/* helper symbol for case_statement */
|
|
|
769 |
void *visit(case_element_list_c *symbol) {return print_list(symbol);}
|
|
|
770 |
|
|
|
771 |
void *visit(case_element_c *symbol) {
|
|
|
772 |
s4o.print(s4o.indent_spaces + "case ");
|
|
|
773 |
symbol->case_list->accept(*this);
|
|
|
774 |
s4o.print(" :\n");
|
|
|
775 |
s4o.indent_right();
|
|
|
776 |
symbol->statement_list->accept(*this);
|
|
|
777 |
s4o.print(s4o.indent_spaces + "break;\n");
|
|
|
778 |
s4o.indent_left();
|
|
|
779 |
return NULL;
|
|
|
780 |
}
|
|
|
781 |
|
|
|
782 |
void *visit(case_list_c *symbol) {return print_list(symbol, "", ", ");}
|
|
|
783 |
|
|
|
784 |
/********************************/
|
|
|
785 |
/* B 3.2.4 Iteration Statements */
|
|
|
786 |
/********************************/
|
|
|
787 |
void *visit(for_statement_c *symbol) {
|
|
|
788 |
s4o.print("for(");
|
|
|
789 |
symbol->control_variable->accept(*this);
|
|
|
790 |
s4o.print(" = ");
|
|
|
791 |
symbol->beg_expression->accept(*this);
|
|
|
792 |
s4o.print("; ");
|
|
|
793 |
symbol->control_variable->accept(*this);
|
|
|
794 |
s4o.print(" != ");
|
|
|
795 |
symbol->end_expression->accept(*this);
|
|
|
796 |
s4o.print("; ");
|
|
|
797 |
symbol->control_variable->accept(*this);
|
|
|
798 |
if (symbol->by_expression != NULL) {
|
|
|
799 |
s4o.print(" += ");
|
|
|
800 |
symbol->by_expression->accept(*this);
|
|
|
801 |
} else {
|
|
|
802 |
s4o.print("++");
|
|
|
803 |
}
|
|
|
804 |
s4o.print(") {\n");
|
|
|
805 |
s4o.indent_right();
|
|
|
806 |
symbol->statement_list->accept(*this);
|
|
|
807 |
s4o.indent_left();
|
|
|
808 |
s4o.print(s4o.indent_spaces); s4o.print("}");
|
|
|
809 |
return NULL;
|
|
|
810 |
}
|
|
|
811 |
void *visit(while_statement_c *symbol) {
|
|
|
812 |
s4o.print("while (");
|
|
|
813 |
symbol->expression->accept(*this);
|
|
|
814 |
s4o.print(") {\n");
|
|
|
815 |
s4o.indent_right();
|
|
|
816 |
symbol->statement_list->accept(*this);
|
|
|
817 |
s4o.indent_left();
|
|
|
818 |
s4o.print(s4o.indent_spaces); s4o.print("}");
|
|
|
819 |
return NULL;
|
|
|
820 |
}
|
|
|
821 |
void *visit(repeat_statement_c *symbol) {
|
|
|
822 |
s4o.print("do {\n");
|
|
|
823 |
s4o.indent_right();
|
|
|
824 |
symbol->statement_list->accept(*this);
|
|
|
825 |
s4o.indent_left();
|
|
|
826 |
s4o.print(s4o.indent_spaces); s4o.print("} while(");
|
|
|
827 |
symbol->expression->accept(*this);
|
|
|
828 |
s4o.print(")");
|
|
|
829 |
return NULL;
|
|
|
830 |
}
|
|
|
831 |
void *visit(exit_statement_c *symbol) {
|
|
|
832 |
s4o.print("exit(0)");
|
|
|
833 |
return NULL;
|
|
|
834 |
}
|
|
|
835 |
|
|
|
836 |
|
|
|
837 |
|
|
|
838 |
}; /* generate_c_st_c */
|
|
|
839 |
|
|
|
840 |
|
|
|
841 |
|
|
|
842 |
|
|
|
843 |
|
|
|
844 |
|
|
|
845 |
|
|
|
846 |
|
|
|
847 |
|