--- a/stage4/generate_c/generate_c_tempvardecl.cc Wed Sep 02 13:39:05 2009 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,179 +0,0 @@
-/*
- * (c) 2003 Mario de Sousa
- *
- * Offered to the public under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
- * Public License for more details.
- *
- * This code is made available on the understanding that it will not be
- * used in safety-critical situations without a full and competent review.
- */
-
-/*
- * An IEC 61131-3 IL and ST compiler.
- *
- * Based on the
- * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
- *
- */
-
-
-/*
- * Declare temporary variables to be later used as output parameters
- * in function calls for which not all output parameters were
- * defined in the original (st or il) source code.
- *
- * This is part of the 4th stage that generates
- * a c++ source program equivalent to the IL and ST
- * code.
- */
-
-
-
-
-class temp_var_name_c {
- private:
- int counter;
-
- public:
- void reset(void) {counter = 0;}
- temp_var_name_c(void) {reset();}
-
- public:
- std::string *new_name(void) {
- std::string *new_str = new std::string(TEMP_VAR);
- /* yikes!!! How to convert an int to a string elegantly???
- * Right now I (Mario) can only think of snprintf()
- * C++ must have a more elegant method!
- */
- int int_str_size = snprintf(NULL, 0, "%d", counter);
- if (int_str_size <= 0) ERROR;
- char *int_str = (char *)malloc(int_str_size+1);
- if (snprintf(int_str, int_str_size+1, "%d", counter++) >= int_str_size+1) ERROR;
- *new_str += int_str;
- free(int_str);
- return new_str;
- }
-
-};
-
-
-
-/***********************************************************************/
-/***********************************************************************/
-/***********************************************************************/
-/***********************************************************************/
-
-
-
-/* Some function calls in the body of functions or function blocks
- * may leave some parameters to their default values, and
- * ignore some output parameters of the function being called.
- * Our conversion of ST functions to C++ does not contemplate that,
- * i.e. each called function must get all it's input and output
- * parameters set correctly.
- * For input parameters we merely need to call the function with
- * the apropriate default value, but for output parameters
- * we must create temporary variables to hold the output value.
- *
- * We declare all the temporary output variables at the begining of
- * the body of each function or function block, and use them as
- * in function calls later on as they become necessary...
- * Note that we cannot create these variables just before a function
- * call, as the function call itself may be integrated within an
- * expression, or another function call!
- *
- * The variables are declared in the exact same order in which they
- * will be used later on during the function calls, which allows us
- * to simply re-create the name that was used for the temporary variable
- * instead of keeping it in some list.
- * The names are recreated by the temp_var_name_factory, after reset()
- * has been called!
- *
- * This function will genertae code similar to...
- *
- * INT __TMP_0 = 23;
- * REAL __TMP_1 = 45.5;
- * ...
- */
-
-class generate_c_tempvardecl_c: generate_c_typedecl_c {
- public:
- generate_c_tempvardecl_c(stage4out_c *s4o_ptr): generate_c_typedecl_c(s4o_ptr) {}
-
- void generate(symbol_c *body, temp_var_name_c *temp_var_name_factory) {
- temp_var_name_factory->reset();
- function_call_iterator_c fcall_iterator(body);
- for(symbol_c *finvocation = NULL; (finvocation = fcall_iterator.next()) != NULL;) {
- /* get the name of the next function that gets called */
- identifier_c *fcalled_name = fcall_iterator.fname();
- /* get that function's declaration... */
- function_declaration_c *fdecl = function_symtable.find_value(fcalled_name);
- if (fdecl == function_symtable.end_value()) {
- function_type_t function_type = get_function_type(fcalled_name);
- if (function_type == function_none) ERROR;
- return;
- }
- /* create iterator to iterate through each of the called function's parameters... */
- function_param_iterator_c fp_iterator(fdecl);
-
- /* iterate through each of the called function's parameters... */
- identifier_c *param_name = NULL;
- function_call_param_iterator_c function_call_param_iterator(finvocation);
- for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
-
- function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
- if (param_direction == function_param_iterator_c::direction_in)
- /* ignore input only parameters...
- * we do not need to create temporary variables for these!
- */
- continue;
-
- /* Get the value from a foo(<param_name> = <param_value>) style call */
- symbol_c *param_value = function_call_param_iterator.search(param_name);
-
- /* Get the value from a foo(<param_value>) style call */
- if (param_value == NULL)
- param_value = function_call_param_iterator.next();
-
- if (param_value != NULL)
- /* ignore output parameters to which a variable is passed...
- * we do not need to create temporary variables for these!
- */
- continue;
-
- symbol_c *param_type = fp_iterator.param_type();
-
- /* get the parameter's default value */
- param_value = fp_iterator.default_value();
-
- /* If no default value specified in function declaration,
- * get the default value of this variable's type
- */
- if (param_value == NULL)
- param_value = (symbol_c *)param_type->accept(*type_initial_value_c::instance());
- if (param_value == NULL) ERROR;
-
- /* now declare a temporary variable, with the correct default value... */
- s4o.print(s4o.indent_spaces);
- param_type->accept(*this);
- s4o.print(" ");
-
- std::string *temp_var_name = temp_var_name_factory->new_name();
- s4o.print(*temp_var_name);
- delete temp_var_name;
-
- s4o.print(" = ");
- param_value->accept(*this);
- s4o.print(";\n");
- }
- }
- temp_var_name_factory->reset();
- s4o.print("\n");
- }
-};