/*
* (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)
*
*/
/*
* Conversion of st statements (i.e. ST code).
*
* This is part of the 4th stage that generates
* a c++ source program equivalent to the IL and ST
* code.
*/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
class generate_c_st_c: public generate_c_typedecl_c {
public:
typedef enum {
expression_vg,
assignment_vg,
complextype_base_vg,
complextype_suffix_vg,
fparam_output_vg
} variablegeneration_t;
private:
/* When calling a function block, we must first find it's type,
* by searching through the declarations of the variables currently
* in scope.
* This class does just that...
* A new class is instantiated whenever we begin generating the code
* for a function block type declaration, or a program declaration.
* This object instance will then later be called while the
* function block's or the program's body is being handled.
*
* Note that functions cannot contain calls to function blocks,
* so we do not create an object instance when handling
* a function declaration.
*/
search_fb_instance_decl_c *search_fb_instance_decl;
/* When compiling st code, it becomes necessary to determine the
* data type of st expressions. To do this, we must first find the
* st operand's declaration, within the scope of the function block
* or function currently being processed.
* The following object does just that...
* This object instance will then later be called while the
* remaining st code is being handled.
*/
search_expression_type_c *search_expression_type;
search_varfb_instance_type_c *search_varfb_instance_type;
search_base_type_c search_base_type;
symbol_c* current_array_type;
symbol_c* current_param_type;
int fcall_number;
symbol_c *fbname;
variablegeneration_t wanted_variablegeneration;
public:
generate_c_st_c(stage4out_c *s4o_ptr, symbol_c *name, symbol_c *scope, const char *variable_prefix = NULL)
: generate_c_typedecl_c(s4o_ptr) {
search_fb_instance_decl = new search_fb_instance_decl_c(scope);
search_expression_type = new search_expression_type_c(scope);
search_varfb_instance_type = new search_varfb_instance_type_c(scope);
this->set_variable_prefix(variable_prefix);
current_array_type = NULL;
current_param_type = NULL;
fcall_number = 0;
fbname = name;
wanted_variablegeneration = expression_vg;
}
virtual ~generate_c_st_c(void) {
delete search_fb_instance_decl;
delete search_expression_type;
delete search_varfb_instance_type;
}
public:
void generate(statement_list_c *stl) {
stl->accept(*this);
}
private:
void *print_getter(symbol_c *symbol) {
unsigned int vartype = search_varfb_instance_type->get_vartype(symbol);
if (wanted_variablegeneration == fparam_output_vg) {
if (vartype == search_var_instance_decl_c::external_vt)
s4o.print(GET_EXTERNAL_BY_REF);
else if (vartype == search_var_instance_decl_c::located_vt)
s4o.print(GET_LOCATED_BY_REF);
else
s4o.print(GET_VAR_BY_REF);
}
else {
if (vartype == search_var_instance_decl_c::external_vt)
s4o.print(GET_EXTERNAL);
else if (vartype == search_var_instance_decl_c::located_vt)
s4o.print(GET_LOCATED);
else
s4o.print(GET_VAR);
}
s4o.print("(");
variablegeneration_t old_wanted_variablegeneration = wanted_variablegeneration;
wanted_variablegeneration = complextype_base_vg;
symbol->accept(*this);
if (search_varfb_instance_type->type_is_complex())
s4o.print(",");
wanted_variablegeneration = complextype_suffix_vg;
symbol->accept(*this);
s4o.print(")");
wanted_variablegeneration = old_wanted_variablegeneration;
return NULL;
}
void *print_setter(symbol_c* symbol,
symbol_c* type,
symbol_c* value,
symbol_c* fb_symbol = NULL,
symbol_c* fb_value = NULL) {
unsigned int vartype = search_varfb_instance_type->get_vartype(symbol);
if (vartype == search_var_instance_decl_c::external_vt) {
symbolic_variable_c *variable = dynamic_cast<symbolic_variable_c *>(symbol);
/* TODO Find a solution for forcing global complex variables */
if (variable != NULL) {
s4o.print(SET_EXTERNAL);
s4o.print("(");
variable->var_name->accept(*this);
s4o.print(",");
}
else {
s4o.print(SET_COMPLEX_EXTERNAL);
s4o.print("(");
}
}
else {
if (vartype == search_var_instance_decl_c::located_vt)
s4o.print(SET_LOCATED);
else
s4o.print(SET_VAR);
s4o.print("(");
}
if (fb_symbol != NULL) {
print_variable_prefix();
fb_symbol->accept(*this);
s4o.print(".");
}
else
wanted_variablegeneration = complextype_base_vg;
symbol->accept(*this);
s4o.print(",");
wanted_variablegeneration = expression_vg;
print_check_function(type, value, fb_value);
if (search_varfb_instance_type->type_is_complex()) {
s4o.print(",");
wanted_variablegeneration = complextype_suffix_vg;
symbol->accept(*this);
}
s4o.print(")");
wanted_variablegeneration = expression_vg;
return NULL;
}
/*********************/
/* B 1.4 - Variables */
/*********************/
void *visit(symbolic_variable_c *symbol) {
unsigned int vartype;
if (wanted_variablegeneration == complextype_base_vg)
generate_c_base_c::visit(symbol);
else if (wanted_variablegeneration == complextype_suffix_vg)
return NULL;
else if (this->is_variable_prefix_null()) {
vartype = search_varfb_instance_type->get_vartype(symbol);
if (wanted_variablegeneration == fparam_output_vg) {
s4o.print("&(");
generate_c_base_c::visit(symbol);
s4o.print(")");
}
else {
generate_c_base_c::visit(symbol);
}
}
else
print_getter(symbol);
return NULL;
}
/********************************************/
/* B.1.4.1 Directly Represented Variables */
/********************************************/
// direct_variable: direct_variable_token {$$ = new direct_variable_c($1);};
void *visit(direct_variable_c *symbol) {
TRACE("direct_variable_c");
/* Do not use print_token() as it will change everything into uppercase */
if (strlen(symbol->value) == 0) ERROR;
if (this->is_variable_prefix_null()) {
if (wanted_variablegeneration != fparam_output_vg)
s4o.print("*(");
}
else {
switch (wanted_variablegeneration) {
case expression_vg:
s4o.print(GET_LOCATED);
s4o.print("(");
break;
case fparam_output_vg:
s4o.print(GET_LOCATED_BY_REF);
s4o.print("(");
break;
default:
break;
}
}
this->print_variable_prefix();
s4o.printlocation(symbol->value + 1);
if ((this->is_variable_prefix_null() && wanted_variablegeneration != fparam_output_vg) ||
wanted_variablegeneration != assignment_vg)
s4o.print(")");
return NULL;
}
/*************************************/
/* B.1.4.2 Multi-element Variables */
/*************************************/
// SYM_REF2(structured_variable_c, record_variable, field_selector)
void *visit(structured_variable_c *symbol) {
TRACE("structured_variable_c");
switch (wanted_variablegeneration) {
case complextype_base_vg:
symbol->record_variable->accept(*this);
break;
case complextype_suffix_vg:
symbol->record_variable->accept(*this);
s4o.print(".");
symbol->field_selector->accept(*this);
break;
default:
if (this->is_variable_prefix_null()) {
symbol->record_variable->accept(*this);
s4o.print(".");
symbol->field_selector->accept(*this);
}
else
print_getter(symbol);
break;
}
return NULL;
}
/* subscripted_variable '[' subscript_list ']' */
//SYM_REF2(array_variable_c, subscripted_variable, subscript_list)
void *visit(array_variable_c *symbol) {
switch (wanted_variablegeneration) {
case complextype_base_vg:
symbol->subscripted_variable->accept(*this);
break;
case complextype_suffix_vg:
symbol->subscripted_variable->accept(*this);
current_array_type = search_varfb_instance_type->get_rawtype(symbol->subscripted_variable);
if (current_array_type == NULL) ERROR;
s4o.print(".table");
symbol->subscript_list->accept(*this);
current_array_type = NULL;
break;
default:
if (this->is_variable_prefix_null()) {
symbol->subscripted_variable->accept(*this);
current_array_type = search_varfb_instance_type->get_rawtype(symbol->subscripted_variable);
if (current_array_type == NULL) ERROR;
s4o.print(".table");
symbol->subscript_list->accept(*this);
current_array_type = NULL;
}
else
print_getter(symbol);
break;
}
return NULL;
}
/* subscript_list ',' subscript */
void *visit(subscript_list_c *symbol) {
for (int i = 0; i < symbol->n; i++) {
s4o.print("[__");
current_array_type->accept(*this);
s4o.print("_TRANSIDX");
print_integer(i);
s4o.print("(");
symbol->elements[i]->accept(*this);
s4o.print(")]");
}
return NULL;
}
/******************************************/
/* B 1.4.3 - Declaration & Initialisation */
/******************************************/
/* helper symbol for structure_initialization */
/* structure_element_initialization_list ',' structure_element_initialization */
void *visit(structure_element_initialization_list_c *symbol) {
generate_c_structure_initialization_c *structure_initialization = new generate_c_structure_initialization_c(&s4o);
structure_initialization->init_structure_default(this->current_param_type);
structure_initialization->init_structure_values(symbol);
delete structure_initialization;
return NULL;
}
/* helper symbol for array_initialization */
/* array_initial_elements_list ',' array_initial_elements */
void *visit(array_initial_elements_list_c *symbol) {
generate_c_array_initialization_c *array_initialization = new generate_c_array_initialization_c(&s4o);
array_initialization->init_array_size(this->current_param_type);
array_initialization->init_array_values(symbol);
delete array_initialization;
return NULL;
}
/***************************************/
/* B.3 - Language ST (Structured Text) */
/***************************************/
/***********************/
/* B 3.1 - Expressions */
/***********************/
void *visit(or_expression_c *symbol) {
symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
if (!search_expression_type->is_same_type(left_type, right_type))
ERROR;
if (search_expression_type->is_bool_type(left_type))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " || ");
if (search_expression_type->is_binary_type(left_type))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " | ");
ERROR;
return NULL;
}
void *visit(xor_expression_c *symbol) {
symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
if (!search_expression_type->is_same_type(left_type, right_type))
ERROR;
if (search_expression_type->is_bool_type(left_type)) {
s4o.print("(");
symbol->l_exp->accept(*this);
s4o.print(" && !");
symbol->r_exp->accept(*this);
s4o.print(") || (!");
symbol->l_exp->accept(*this);
s4o.print(" && ");
symbol->r_exp->accept(*this);
s4o.print(")");
return NULL;
}
if (search_expression_type->is_binary_type(left_type))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " ^ ");
ERROR;
return NULL;
}
void *visit(and_expression_c *symbol) {
symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
if (!search_expression_type->is_same_type(left_type, right_type))
ERROR;
if (search_expression_type->is_bool_type(left_type))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " && ");
if (search_expression_type->is_binary_type(left_type))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " & ");
ERROR;
return NULL;
}
void *visit(equ_expression_c *symbol) {
symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
if (!search_expression_type->is_same_type(left_type, right_type))
ERROR;
if (search_expression_type->is_time_type(left_type) ||
search_expression_type->is_string_type(left_type))
return print_compare_function("__eq_", left_type, symbol->l_exp, symbol->r_exp);
return print_binary_expression(symbol->l_exp, symbol->r_exp, " == ");
}
void *visit(notequ_expression_c *symbol) {
symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
if (!search_expression_type->is_same_type(left_type, right_type))
ERROR;
if (search_expression_type->is_time_type(left_type) ||
search_expression_type->is_string_type(left_type))
return print_compare_function("__ne_", left_type, symbol->l_exp, symbol->r_exp);
return print_binary_expression(symbol->l_exp, symbol->r_exp, " != ");
}
void *visit(lt_expression_c *symbol) {
symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
if (!search_expression_type->is_same_type(left_type, right_type))
ERROR;
if (search_expression_type->is_time_type(left_type) ||
search_expression_type->is_string_type(left_type))
return print_compare_function("__lt_", left_type, symbol->l_exp, symbol->r_exp);
if (!search_base_type.type_is_enumerated(left_type))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " < ");
ERROR;
return NULL;
}
void *visit(gt_expression_c *symbol) {
symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
if (!search_expression_type->is_same_type(left_type, right_type))
ERROR;
if (search_expression_type->is_time_type(left_type) ||
search_expression_type->is_string_type(left_type))
return print_compare_function("__gt_", left_type, symbol->l_exp, symbol->r_exp);
if (!search_base_type.type_is_enumerated(left_type))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " > ");
ERROR;
return NULL;
}
void *visit(le_expression_c *symbol) {
symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
if (!search_expression_type->is_same_type(left_type, right_type))
ERROR;
if (search_expression_type->is_time_type(left_type) ||
search_expression_type->is_string_type(left_type))
return print_compare_function("__le_", left_type, symbol->l_exp, symbol->r_exp);
if (!search_base_type.type_is_enumerated(left_type))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " <= ");
ERROR;
return NULL;
}
void *visit(ge_expression_c *symbol) {
symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
if (!search_expression_type->is_same_type(left_type, right_type))
ERROR;
if (search_expression_type->is_time_type(left_type) ||
search_expression_type->is_string_type(left_type))
return print_compare_function("__ge_", left_type, symbol->l_exp, symbol->r_exp);
if (!search_base_type.type_is_enumerated(left_type))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " >= ");
ERROR;
return NULL;
}
void *visit(add_expression_c *symbol) {
symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
if ((typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) ||
(typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) ||
(typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)))
return print_binary_function("__TIME_ADD", symbol->l_exp, symbol->r_exp);
if (!search_expression_type->is_same_type(left_type, right_type))
ERROR;
if (search_expression_type->is_integer_type(left_type) || search_expression_type->is_real_type(left_type))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " + ");
ERROR;
return NULL;
}
void *visit(sub_expression_c *symbol) {
symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
if ((typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) ||
(typeid(*left_type) == typeid(date_type_name_c) && typeid(*right_type) == typeid(date_type_name_c)) ||
(typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) ||
(typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(tod_type_name_c)) ||
(typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) ||
(typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(dt_type_name_c)))
return print_binary_function("__TIME_SUB", symbol->l_exp, symbol->r_exp);
if (!search_expression_type->is_same_type(left_type, right_type))
ERROR;
if (search_expression_type->is_integer_type(left_type) || search_expression_type->is_real_type(left_type))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " - ");
ERROR;
return NULL;
}
void *visit(mul_expression_c *symbol) {
symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
if ((typeid(*left_type) == typeid(time_type_name_c) && search_expression_type->is_integer_type(right_type)) ||
(typeid(*left_type) == typeid(time_type_name_c) && search_expression_type->is_real_type(right_type)))
return print_binary_function("__TIME_MUL", symbol->l_exp, symbol->r_exp);
if (!search_expression_type->is_same_type(left_type, right_type))
ERROR;
if (search_expression_type->is_integer_type(left_type) || search_expression_type->is_real_type(left_type))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " * ");
ERROR;
return NULL;
}
void *visit(div_expression_c *symbol) {
symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
if ((typeid(*left_type) == typeid(time_type_name_c) && search_expression_type->is_integer_type(right_type)) ||
(typeid(*left_type) == typeid(time_type_name_c) && search_expression_type->is_real_type(right_type)))
return print_binary_function("__TIME_DIV", symbol->l_exp, symbol->r_exp);
if (!search_expression_type->is_same_type(left_type, right_type))
ERROR;
if (search_expression_type->is_integer_type(left_type) || search_expression_type->is_real_type(left_type))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " / ");
ERROR;
return NULL;
}
void *visit(mod_expression_c *symbol) {
symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
if (!search_expression_type->is_same_type(left_type, right_type))
ERROR;
if (search_expression_type->is_integer_type(left_type) || search_expression_type->is_real_type(left_type)) {
s4o.print("((");
symbol->r_exp->accept(*this);
s4o.print(" == 0)?0:");
print_binary_expression(symbol->l_exp, symbol->r_exp, " % ");
s4o.print(")");
return NULL;
}
ERROR;
return NULL;
}
/* TODO: power expression... */
void *visit(power_expression_c *symbol) {ERROR; return print_binary_expression(symbol->l_exp, symbol->r_exp, " ** ");}
void *visit(neg_expression_c *symbol) {
symbol_c *exp_type = search_expression_type->get_type(symbol->exp);
if (search_expression_type->is_integer_type(exp_type) || search_expression_type->is_real_type(exp_type))
return print_unary_expression(symbol->exp, " -");
ERROR;
return NULL;
}
void *visit(not_expression_c *symbol) {
symbol_c *exp_type = search_expression_type->get_type(symbol->exp);
if (search_expression_type->is_binary_type(exp_type))
return print_unary_expression(symbol->exp, search_expression_type->is_bool_type(exp_type)?"!":"~");
ERROR;
return NULL;
}
void *visit(function_invocation_c *symbol) {
symbol_c* function_type_prefix = NULL;
symbol_c* function_name = NULL;
symbol_c* function_type_suffix = NULL;
DECLARE_PARAM_LIST()
symbol_c *parameter_assignment_list = NULL;
if (NULL != symbol-> formal_param_list) parameter_assignment_list = symbol-> formal_param_list;
if (NULL != symbol->nonformal_param_list) parameter_assignment_list = symbol->nonformal_param_list;
if (NULL == parameter_assignment_list) ERROR;
function_call_param_iterator_c function_call_param_iterator(symbol);
function_declaration_c *f_decl = function_symtable.find_value(symbol->function_name);
if (f_decl == function_symtable.end_value()) {
/* The function called is not in the symtable, so we test if it is a
* standard function defined in standard */
function_type_t current_function_type = get_function_type((identifier_c *)symbol->function_name);
if (current_function_type == function_none) ERROR;
symbol_c *function_return_type = search_expression_type->get_type(symbol);
int nb_param = ((list_c *)parameter_assignment_list)->n;
symbol_c *en_param_name = (symbol_c *)(new identifier_c("EN"));
/* Get the value from EN param */
symbol_c *EN_param_value = function_call_param_iterator.search_f(en_param_name);
if (EN_param_value == NULL)
EN_param_value = (symbol_c*)(new boolean_literal_c((symbol_c*)(new bool_type_name_c()), new boolean_true_c()));
else
nb_param --;
ADD_PARAM_LIST(en_param_name, EN_param_value, (symbol_c*)(new bool_type_name_c()), function_param_iterator_c::direction_in)
symbol_c *eno_param_name = (symbol_c *)(new identifier_c("ENO"));
/* Get the value from ENO param */
symbol_c *ENO_param_value = function_call_param_iterator.search_f(eno_param_name);
if (ENO_param_value != NULL)
nb_param --;
ADD_PARAM_LIST(eno_param_name, ENO_param_value, (symbol_c*)(new bool_type_name_c()), function_param_iterator_c::direction_out)
#include "st_code_gen.c"
}
else {
function_name = symbol->function_name;
/* loop through each function parameter, find the value we should pass
* to it, and then output the c equivalent...
*/
function_param_iterator_c fp_iterator(f_decl);
identifier_c *param_name;
for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
symbol_c *param_type = fp_iterator.param_type();
if (param_type == NULL) ERROR;
function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
/* Get the value from a foo(<param_name> = <param_value>) style call */
symbol_c *param_value = function_call_param_iterator.search_f(param_name);
/* Get the value from a foo(<param_value>) style call */
if (param_value == NULL) {
param_value = function_call_param_iterator.next_nf();
if (param_value != NULL && fp_iterator.is_en_eno_param_implicit()) ERROR;
}
if (param_value == NULL && param_direction == function_param_iterator_c::direction_in) {
/* No value given for parameter, so we must use the default... */
/* First check whether default value specified in function declaration...*/
param_value = fp_iterator.default_value();
}
ADD_PARAM_LIST(param_name, param_value, param_type, param_direction)
} /* for(...) */
// symbol->parameter_assignment->accept(*this);
}
if (function_call_param_iterator.next_nf() != NULL) ERROR;
bool has_output_params = false;
if (!this->is_variable_prefix_null()) {
PARAM_LIST_ITERATOR() {
if ((PARAM_DIRECTION == function_param_iterator_c::direction_out ||
PARAM_DIRECTION == function_param_iterator_c::direction_inout) &&
PARAM_VALUE != NULL) {
if (!has_output_params) {
has_output_params = true;
}
}
}
}
if (function_type_prefix != NULL) {
s4o.print("(");
function_type_prefix->accept(*this);
s4o.print(")");
}
if (has_output_params) {
fcall_number++;
s4o.print("__");
fbname->accept(*this);
s4o.print("_");
function_name->accept(*this);
if (function_type_suffix != NULL)
function_type_suffix->accept(*this);
s4o.print_integer(fcall_number);
}
else {
function_name->accept(*this);
if (function_type_suffix != NULL)
function_type_suffix->accept(*this);
}
s4o.print("(");
s4o.indent_right();
int nb_param = 0;
PARAM_LIST_ITERATOR() {
symbol_c *param_value = PARAM_VALUE;
current_param_type = PARAM_TYPE;
switch (PARAM_DIRECTION) {
case function_param_iterator_c::direction_in:
if (nb_param > 0)
s4o.print(",\n"+s4o.indent_spaces);
if (param_value == NULL) {
/* If not, get the default value of this variable's type */
param_value = (symbol_c *)current_param_type->accept(*type_initial_value_c::instance());
}
if (param_value == NULL) ERROR;
s4o.print("(");
if (search_expression_type->is_literal_integer_type(current_param_type))
search_expression_type->lint_type_name.accept(*this);
else if (search_expression_type->is_literal_real_type(current_param_type))
search_expression_type->lreal_type_name.accept(*this);
else
current_param_type->accept(*this);
s4o.print(")");
print_check_function(current_param_type, param_value);
nb_param++;
break;
case function_param_iterator_c::direction_out:
case function_param_iterator_c::direction_inout:
if (!has_output_params) {
if (nb_param > 0)
s4o.print(",\n"+s4o.indent_spaces);
if (param_value == NULL)
s4o.print("NULL");
else {
wanted_variablegeneration = fparam_output_vg;
param_value->accept(*this);
wanted_variablegeneration = expression_vg;
}
nb_param++;
}
break;
case function_param_iterator_c::direction_extref:
/* TODO! */
ERROR;
break;
} /* switch */
}
if (has_output_params) {
if (nb_param > 0)
s4o.print(",\n"+s4o.indent_spaces);
s4o.print(FB_FUNCTION_PARAM);
}
s4o.print(")");
s4o.indent_left();
CLEAR_PARAM_LIST()
return NULL;
}
/********************/
/* B 3.2 Statements */
/********************/
void *visit(statement_list_c *symbol) {
return print_list(symbol, s4o.indent_spaces, ";\n" + s4o.indent_spaces, ";\n");
}
/*********************************/
/* B 3.2.1 Assignment Statements */
/*********************************/
void *visit(assignment_statement_c *symbol) {
symbol_c *left_type = search_varfb_instance_type->get_rawtype(symbol->l_exp);
if (this->is_variable_prefix_null()) {
symbol->l_exp->accept(*this);
s4o.print(" = ");
print_check_function(left_type, symbol->r_exp);
}
else {
print_setter(symbol->l_exp, left_type, symbol->r_exp);
}
return NULL;
}
/*****************************************/
/* B 3.2.2 Subprogram Control Statements */
/*****************************************/
/* 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");
/* first figure out what is the name of the function block type of the function block being called... */
symbol_c *function_block_type_name = this->search_fb_instance_decl->get_type_name(symbol->fb_name);
/* should never occur. The function block instance MUST have been declared... */
if (function_block_type_name == NULL) ERROR;
/* Now find the declaration of the function block type being called... */
function_block_declaration_c *fb_decl = function_block_type_symtable.find_value(function_block_type_name);
/* should never occur. The function block type being called MUST be in the symtable... */
if (fb_decl == function_block_type_symtable.end_value()) ERROR;
/* loop through each function block parameter, find the value we should pass
* to it, and then output the c equivalent...
*/
function_param_iterator_c fp_iterator(fb_decl);
identifier_c *param_name;
function_call_param_iterator_c function_call_param_iterator(symbol);
for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
/*fprintf(stderr, "param : %s\n", param_name->value);*/
/* Get the value from a foo(<param_name> = <param_value>) style call */
symbol_c *param_value = function_call_param_iterator.search_f(param_name);
/* Get the value from a foo(<param_value>) style call */
if (param_value == NULL)
param_value = function_call_param_iterator.next_nf();
symbol_c *param_type = fp_iterator.param_type();
if (param_type == NULL) ERROR;
/* now output the value assignment */
if (param_value != NULL)
if ((param_direction == function_param_iterator_c::direction_in) ||
(param_direction == function_param_iterator_c::direction_inout)) {
if (this->is_variable_prefix_null()) {
symbol->fb_name->accept(*this);
s4o.print(".");
param_name->accept(*this);
s4o.print(" = ");
print_check_function(param_type, param_value);
}
else {
print_setter(param_name, param_type, param_value, symbol->fb_name);
}
s4o.print(";\n" + s4o.indent_spaces);
}
} /* for(...) */
/* now call the function... */
function_block_type_name->accept(*this);
s4o.print(FB_FUNCTION_SUFFIX);
s4o.print("(&");
print_variable_prefix();
symbol->fb_name->accept(*this);
s4o.print(")");
/* loop through each function parameter, find the variable to which
* we should atribute the value of all output or inoutput parameters.
*/
fp_iterator.reset();
function_call_param_iterator.reset();
for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
/* Get the value from a foo(<param_name> = <param_value>) style call */
symbol_c *param_value = function_call_param_iterator.search_f(param_name);
/* Get the value from a foo(<param_value>) style call */
if (param_value == NULL)
param_value = function_call_param_iterator.next_nf();
/* now output the value assignment */
if (param_value != NULL)
if ((param_direction == function_param_iterator_c::direction_out) ||
(param_direction == function_param_iterator_c::direction_inout)) {
symbol_c *param_type = search_varfb_instance_type->get_rawtype(param_value);
s4o.print(";\n" + s4o.indent_spaces);
if (this->is_variable_prefix_null()) {
param_value->accept(*this);
s4o.print(" = ");
print_check_function(param_type, param_name, symbol->fb_name);
}
else {
print_setter(param_value, param_type, param_name, NULL, symbol->fb_name);
}
}
} /* for(...) */
return NULL;
}
/* helper symbol for fb_invocation */
/* param_assignment_list ',' param_assignment */
void *visit(param_assignment_list_c *symbol) {
TRACE("param_assignment_list_c");
/* this should never be called... */
ERROR;
return NULL;
// return print_list(symbol, "", ", ");
}
void *visit(input_variable_param_assignment_c *symbol) {
TRACE("input_variable_param_assignment_c");
/* this should never be called... */
ERROR;
return NULL;
/*
symbol->variable_name->accept(*this);
s4o.print(" = ");
symbol->expression->accept(*this);
return NULL;
*/
}
void *visit(output_variable_param_assignment_c *symbol) {
TRACE("output_variable_param_assignment_c");
/* this should never be called... */
ERROR;
return NULL;
/*
s4o.print(s4o.indent_spaces);
if (symbol->not_param != NULL)
symbol->not_param->accept(*this);
symbol->variable_name->accept(*this);
s4o.print(" => ");
symbol->variable->accept(*this);
return NULL;
*/
}
// TODO: the NOT symbol in function (block) calls...
void *visit(not_paramassign_c *symbol) {
TRACE("not_paramassign_c");
/* this should never be called... */
ERROR;
return NULL;
/*
s4o.print("NOT ");
return NULL;
*/
}
/********************************/
/* B 3.2.3 Selection Statements */
/********************************/
void *visit(if_statement_c *symbol) {
s4o.print("if (");
symbol->expression->accept(*this);
s4o.print(") {\n");
s4o.indent_right();
symbol->statement_list->accept(*this);
s4o.indent_left();
symbol->elseif_statement_list->accept(*this);
if (symbol->else_statement_list != NULL) {
s4o.print(s4o.indent_spaces); s4o.print("} else {\n");
s4o.indent_right();
symbol->else_statement_list->accept(*this);
s4o.indent_left();
}
s4o.print(s4o.indent_spaces); s4o.print("}");
return NULL;
}
/* helper symbol for if_statement */
void *visit(elseif_statement_list_c *symbol) {return print_list(symbol);}
/* helper symbol for elseif_statement_list */
void *visit(elseif_statement_c *symbol) {
s4o.print(s4o.indent_spaces); s4o.print("} else if (");
symbol->expression->accept(*this);
s4o.print(") {\n");
s4o.indent_right();
symbol->statement_list->accept(*this);
s4o.indent_left();
return NULL;
}
void *visit(case_statement_c *symbol) {
s4o.print("switch(");
symbol->expression->accept(*this);
s4o.print(") {\n");
s4o.indent_right();
symbol->case_element_list->accept(*this);
if (symbol->statement_list != NULL) {
s4o.print(s4o.indent_spaces + "default:\n");
s4o.indent_right();
symbol->statement_list->accept(*this);
s4o.print(s4o.indent_spaces + "break;\n");
s4o.indent_left();
}
s4o.indent_left();
s4o.print(s4o.indent_spaces + "}");
return NULL;
}
/* helper symbol for case_statement */
void *visit(case_element_list_c *symbol) {return print_list(symbol);}
void *visit(case_element_c *symbol) {
s4o.print(s4o.indent_spaces + "case ");
symbol->case_list->accept(*this);
s4o.print(" :\n");
s4o.indent_right();
symbol->statement_list->accept(*this);
s4o.print(s4o.indent_spaces + "break;\n");
s4o.indent_left();
return NULL;
}
void *visit(case_list_c *symbol) {return print_list(symbol, "", ", ");}
/********************************/
/* B 3.2.4 Iteration Statements */
/********************************/
void *visit(for_statement_c *symbol) {
s4o.print("for(");
symbol->control_variable->accept(*this);
s4o.print(" = ");
symbol->beg_expression->accept(*this);
s4o.print("; ");
symbol->control_variable->accept(*this);
s4o.print(" != ");
symbol->end_expression->accept(*this);
s4o.print("; ");
symbol->control_variable->accept(*this);
if (symbol->by_expression != NULL) {
s4o.print(" += ");
symbol->by_expression->accept(*this);
} else {
s4o.print("++");
}
s4o.print(") {\n");
s4o.indent_right();
symbol->statement_list->accept(*this);
s4o.indent_left();
s4o.print(s4o.indent_spaces); s4o.print("}");
return NULL;
}
void *visit(while_statement_c *symbol) {
s4o.print("while (");
symbol->expression->accept(*this);
s4o.print(") {\n");
s4o.indent_right();
symbol->statement_list->accept(*this);
s4o.indent_left();
s4o.print(s4o.indent_spaces); s4o.print("}");
return NULL;
}
void *visit(repeat_statement_c *symbol) {
s4o.print("do {\n");
s4o.indent_right();
symbol->statement_list->accept(*this);
s4o.indent_left();
s4o.print(s4o.indent_spaces); s4o.print("} while(");
symbol->expression->accept(*this);
s4o.print(")");
return NULL;
}
void *visit(exit_statement_c *symbol) {
s4o.print("exit(0)");
return NULL;
}
}; /* generate_c_st_c */