Fix bug: allow use, as lvalues, structures/arrays inside FBs (e.g. fb1.struct1.r := 33.3).
/*
* matiec - a compiler for the programming languages defined in IEC 61131-3
*
* Copyright (C) 2003-2011 Mario de Sousa (msousa@fe.up.pt)
* Copyright (C) 2007-2011 Laurent Bessard and Edouard Tisserant
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* This code is made available on the understanding that it will not be
* used in safety-critical situations without a full and competent review.
*
* 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, or SFC
* code.
*/
#include "../../util/strdup.hh"
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
class generate_c_st_c: public generate_c_typedecl_c {
public:
typedef enum {
expression_vg,
assignment_vg,
complextype_base_vg,
complextype_base_assignment_vg,
complextype_suffix_vg,
fparam_output_vg
} variablegeneration_t;
typedef enum {
single_cg,
subrange_cg,
none_cg
} casegeneration_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;
search_varfb_instance_type_c *search_varfb_instance_type;
search_var_instance_decl_c *search_var_instance_decl;
symbol_c* current_array_type;
symbol_c* current_param_type;
int fcall_number;
symbol_c *fbname;
bool first_subrange_case_list;
variablegeneration_t wanted_variablegeneration;
casegeneration_t wanted_casegeneration;
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_varfb_instance_type = new search_varfb_instance_type_c(scope);
search_var_instance_decl = new search_var_instance_decl_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;
wanted_casegeneration = none_cg;
}
virtual ~generate_c_st_c(void) {
delete search_fb_instance_decl;
delete search_varfb_instance_type;
delete search_var_instance_decl;
}
public:
void generate(statement_list_c *stl) {
stl->accept(*this);
}
private:
void *print_getter(symbol_c *symbol) {
unsigned int vartype = search_var_instance_decl->get_vartype(symbol);
if (wanted_variablegeneration == fparam_output_vg) {
if (vartype == search_var_instance_decl_c::external_vt) {
if (search_var_instance_decl->type_is_fb(symbol))
s4o.print(GET_EXTERNAL_FB_BY_REF);
else
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) {
if (search_var_instance_decl->type_is_fb(symbol))
s4o.print(GET_EXTERNAL_FB);
else
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);
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) {
bool type_is_complex = false;
if (fb_symbol == NULL) {
unsigned int vartype = search_var_instance_decl->get_vartype(symbol);
type_is_complex = analyse_variable_c::contains_complex_type(symbol);
if (vartype == search_var_instance_decl_c::external_vt) {
if (search_var_instance_decl->type_is_fb(symbol))
s4o.print(SET_EXTERNAL_FB);
else
s4o.print(SET_EXTERNAL);
}
else if (vartype == search_var_instance_decl_c::located_vt)
s4o.print(SET_LOCATED);
else
s4o.print(SET_VAR);
}
else {
unsigned int vartype = search_var_instance_decl->get_vartype(fb_symbol);
if (vartype == search_var_instance_decl_c::external_vt)
s4o.print(SET_EXTERNAL_FB);
else
s4o.print(SET_VAR);
}
s4o.print("(");
if (fb_symbol != NULL) {
print_variable_prefix();
fb_symbol->accept(*this);
s4o.print(".,");
}
else if (type_is_complex)
wanted_variablegeneration = complextype_base_assignment_vg;
else
wanted_variablegeneration = assignment_vg;
symbol->accept(*this);
s4o.print(",");
wanted_variablegeneration = expression_vg;
print_check_function(type, value, fb_value);
if (type_is_complex) {
s4o.print(",");
wanted_variablegeneration = complextype_suffix_vg;
symbol->accept(*this);
}
s4o.print(")");
wanted_variablegeneration = expression_vg;
return NULL;
}
/********************************/
/* B 1.3.3 - Derived data types */
/********************************/
/* signed_integer DOTDOT signed_integer */
void *visit(subrange_c *symbol) {
switch (wanted_casegeneration) {
case subrange_cg:
s4o.print("__case_expression >= ");
symbol->lower_limit->accept(*this);
s4o.print(" && __case_expression <= ");
symbol->upper_limit->accept(*this);
break;
default:
symbol->lower_limit->accept(*this);
break;
}
return NULL;
}
/* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
void *visit(array_specification_c *symbol) {
symbol->non_generic_type_name->accept(*this);
return NULL;
}
/* enumerated_type_name ':' enumerated_spec_init */
void *visit(enumerated_type_declaration_c *symbol) {
symbol->enumerated_type_name->accept(*this);
return NULL;
}
/*********************/
/* B 1.4 - Variables */
/*********************/
void *visit(symbolic_variable_c *symbol) {
switch (wanted_variablegeneration) {
case complextype_base_assignment_vg:
case assignment_vg:
this->print_variable_prefix();
s4o.print(",");
symbol->var_name->accept(*this);
break;
case complextype_base_vg:
generate_c_base_c::visit(symbol);
break;
case complextype_suffix_vg:
break;
default:
if (this->is_variable_prefix_null()) {
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);
break;
}
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");
bool type_is_complex = search_var_instance_decl->type_is_complex(symbol->record_variable);
switch (wanted_variablegeneration) {
case complextype_base_vg:
case complextype_base_assignment_vg:
symbol->record_variable->accept(*this);
if (!type_is_complex) {
s4o.print(".");
symbol->field_selector->accept(*this);
}
break;
case complextype_suffix_vg:
symbol->record_variable->accept(*this);
if (type_is_complex) {
s4o.print(".");
symbol->field_selector->accept(*this);
}
break;
case assignment_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:
case complextype_base_assignment_vg:
symbol->subscripted_variable->accept(*this);
break;
case complextype_suffix_vg:
symbol->subscripted_variable->accept(*this);
current_array_type = search_varfb_instance_type->get_basetype_decl(symbol->subscripted_variable);
if (current_array_type == NULL) ERROR;
s4o.print(".table");
wanted_variablegeneration = expression_vg;
symbol->subscript_list->accept(*this);
wanted_variablegeneration = complextype_suffix_vg;
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_basetype_decl(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) {
array_dimension_iterator_c* array_dimension_iterator = new array_dimension_iterator_c(current_array_type);
for (int i = 0; i < symbol->n; i++) {
symbol_c* dimension = array_dimension_iterator->next();
if (dimension == NULL) ERROR;
s4o.print("[(");
symbol->elements[i]->accept(*this);
s4o.print(") - (");
dimension->accept(*this);
s4o.print(")]");
}
delete array_dimension_iterator;
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) {
if (get_datatype_info_c::is_BOOL_compatible(symbol->datatype))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " || ");
if (get_datatype_info_c::is_ANY_nBIT_compatible(symbol->datatype))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " | ");
ERROR;
return NULL;
}
void *visit(xor_expression_c *symbol) {
if (get_datatype_info_c::is_BOOL_compatible(symbol->datatype)) {
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 (get_datatype_info_c::is_ANY_nBIT_compatible(symbol->datatype))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " ^ ");
ERROR;
return NULL;
}
void *visit(and_expression_c *symbol) {
if (get_datatype_info_c::is_BOOL_compatible(symbol->datatype))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " && ");
if (get_datatype_info_c::is_ANY_nBIT_compatible(symbol->datatype))
return print_binary_expression(symbol->l_exp, symbol->r_exp, " & ");
ERROR;
return NULL;
}
void *visit(equ_expression_c *symbol) {
if (get_datatype_info_c::is_TIME_compatible (symbol->l_exp->datatype) ||
get_datatype_info_c::is_ANY_DATE_compatible (symbol->l_exp->datatype) ||
get_datatype_info_c::is_ANY_STRING_compatible(symbol->l_exp->datatype))
return print_compare_function("EQ_", symbol->l_exp->datatype, symbol->l_exp, symbol->r_exp);
return print_binary_expression(symbol->l_exp, symbol->r_exp, " == ");
}
void *visit(notequ_expression_c *symbol) {
if (get_datatype_info_c::is_TIME_compatible (symbol->l_exp->datatype) ||
get_datatype_info_c::is_ANY_DATE_compatible (symbol->l_exp->datatype) ||
get_datatype_info_c::is_ANY_STRING_compatible(symbol->l_exp->datatype))
return print_compare_function("NE_", symbol->l_exp->datatype, symbol->l_exp, symbol->r_exp);
return print_binary_expression(symbol->l_exp, symbol->r_exp, " != ");
}
void *visit(lt_expression_c *symbol) {
if (get_datatype_info_c::is_TIME_compatible (symbol->l_exp->datatype) ||
get_datatype_info_c::is_ANY_DATE_compatible (symbol->l_exp->datatype) ||
get_datatype_info_c::is_ANY_STRING_compatible(symbol->l_exp->datatype))
return print_compare_function("LT_", symbol->l_exp->datatype, symbol->l_exp, symbol->r_exp);
return print_binary_expression(symbol->l_exp, symbol->r_exp, " < ");
}
void *visit(gt_expression_c *symbol) {
if (get_datatype_info_c::is_TIME_compatible (symbol->l_exp->datatype) ||
get_datatype_info_c::is_ANY_DATE_compatible (symbol->l_exp->datatype) ||
get_datatype_info_c::is_ANY_STRING_compatible(symbol->l_exp->datatype))
return print_compare_function("GT_", symbol->l_exp->datatype, symbol->l_exp, symbol->r_exp);
return print_binary_expression(symbol->l_exp, symbol->r_exp, " > ");
}
void *visit(le_expression_c *symbol) {
if (get_datatype_info_c::is_TIME_compatible (symbol->l_exp->datatype) ||
get_datatype_info_c::is_ANY_DATE_compatible (symbol->l_exp->datatype) ||
get_datatype_info_c::is_ANY_STRING_compatible(symbol->l_exp->datatype))
return print_compare_function("LE_", symbol->l_exp->datatype, symbol->l_exp, symbol->r_exp);
return print_binary_expression(symbol->l_exp, symbol->r_exp, " <= ");
}
void *visit(ge_expression_c *symbol) {
if (get_datatype_info_c::is_TIME_compatible (symbol->l_exp->datatype) ||
get_datatype_info_c::is_ANY_DATE_compatible (symbol->l_exp->datatype) ||
get_datatype_info_c::is_ANY_STRING_compatible(symbol->l_exp->datatype))
return print_compare_function("GE_", symbol->l_exp->datatype, symbol->l_exp, symbol->r_exp);
return print_binary_expression(symbol->l_exp, symbol->r_exp, " >= ");
}
void *visit(add_expression_c *symbol) {
/*
symbol_c *left_type = symbol->l_exp->datatype;
symbol_c *right_type = symbol->r_exp->datatype;
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 (get_datatype_info_c::is_TIME_compatible (symbol->datatype) ||
get_datatype_info_c::is_ANY_DATE_compatible (symbol->datatype))
return print_binary_function("__time_add", symbol->l_exp, symbol->r_exp);
return print_binary_expression(symbol->l_exp, symbol->r_exp, " + ");
}
void *visit(sub_expression_c *symbol) {
/*
symbol_c *left_type = symbol->l_exp->datatype;
symbol_c *right_type = symbol->r_exp->datatype;
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 (get_datatype_info_c::is_TIME_compatible (symbol->datatype) ||
get_datatype_info_c::is_ANY_DATE_compatible (symbol->datatype))
return print_binary_function("__time_sub", symbol->l_exp, symbol->r_exp);
return print_binary_expression(symbol->l_exp, symbol->r_exp, " - ");
}
void *visit(mul_expression_c *symbol) {
/*
symbol_c *left_type = symbol->l_exp->datatype;
symbol_c *right_type = symbol->r_exp->datatype;
if ((typeid(*left_type) == typeid(time_type_name_c) && get_datatype_info_c::is_ANY_INT_compatible (right_type)) ||
(typeid(*left_type) == typeid(time_type_name_c) && get_datatype_info_c::is_ANY_REAL_compatible(right_type)))
return print_binary_function("__time_mul", symbol->l_exp, symbol->r_exp);
*/
if (get_datatype_info_c::is_TIME_compatible (symbol->datatype))
return print_binary_function("__time_mul", symbol->l_exp, symbol->r_exp);
return print_binary_expression(symbol->l_exp, symbol->r_exp, " * ");
}
void *visit(div_expression_c *symbol) {
/*
symbol_c *left_type = symbol->l_exp->datatype;
symbol_c *right_type = symbol->r_exp->datatype;
if ((typeid(*left_type) == typeid(time_type_name_c) && get_datatype_info_c::is_ANY_INT_compatible (right_type)) ||
(typeid(*left_type) == typeid(time_type_name_c) && get_datatype_info_c::is_ANY_REAL_compatible(right_type)))
return print_binary_function("__time_div", symbol->l_exp, symbol->r_exp);
*/
if (get_datatype_info_c::is_TIME_compatible (symbol->datatype))
return print_binary_function("__time_div", symbol->l_exp, symbol->r_exp);
return print_binary_expression(symbol->l_exp, symbol->r_exp, " / ");
}
void *visit(mod_expression_c *symbol) {
s4o.print("((");
symbol->r_exp->accept(*this);
s4o.print(" == 0)?0:");
print_binary_expression(symbol->l_exp, symbol->r_exp, " % ");
s4o.print(")");
return NULL;
}
void *visit(power_expression_c *symbol) {
s4o.print("EXPT__LREAL__LREAL__LREAL((BOOL)__BOOL_LITERAL(TRUE),\n");
s4o.indent_right();
s4o.print(s4o.indent_spaces + "NULL,\n");
s4o.print(s4o.indent_spaces + "(LREAL)(");
symbol->l_exp->accept(*this);
s4o.print("),\n");
s4o.print(s4o.indent_spaces + "(LREAL)(");
symbol->r_exp->accept(*this);
s4o.print("))");
return NULL;
}
void *visit(neg_expression_c *symbol) {
return print_unary_expression(symbol->exp, " -");
}
void *visit(not_expression_c *symbol) {
return print_unary_expression(symbol->exp, get_datatype_info_c::is_BOOL_compatible(symbol->datatype)?"!":"~");
}
void *visit(function_invocation_c *symbol) {
symbol_c* function_name = 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_declaration_c *)symbol->called_function_declaration;
if (f_decl == NULL) ERROR;
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;
/* flag to cirreclty handle calls to extensible standard functions (i.e. functions with variable number of input parameters) */
bool found_first_extensible_parameter = false;
for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
if (fp_iterator.is_extensible_param() && (!found_first_extensible_parameter)) {
/* We are calling an extensible function. Before passing the extensible
* parameters, we must add a dummy paramater value to tell the called
* function how many extensible parameters we will be passing.
*
* Note that stage 3 has already determined the number of extensible
* paramters, and stored that info in the abstract syntax tree. We simply
* re-use that value.
*/
/* NOTE: we are not freeing the malloc'd memory. This is not really a bug.
* Since we are writing a compiler, which runs to termination quickly,
* we can consider this as just memory required for the compilation process
* that will be free'd when the program terminates.
*/
char *tmp = (char *)malloc(32); /* enough space for a call with 10^31 (larger than 2^64) input parameters! */
if (tmp == NULL) ERROR;
int res = snprintf(tmp, 32, "%d", symbol->extensible_param_count);
if ((res >= 32) || (res < 0)) ERROR;
identifier_c *param_value = new identifier_c(tmp);
uint_type_name_c *param_type = new uint_type_name_c();
identifier_c *param_name = new identifier_c("");
ADD_PARAM_LIST(param_name, param_value, param_type, function_param_iterator_c::direction_in)
found_first_extensible_parameter = true;
}
if (fp_iterator.is_extensible_param()) {
/* since we are handling an extensible parameter, we must add the index to the
* parameter name so we can go looking for the value passed to the correct
* extended parameter (e.g. IN1, IN2, IN3, IN4, ...)
*/
char *tmp = (char *)malloc(32); /* enough space for a call with 10^31 (larger than 2^64) input parameters! */
int res = snprintf(tmp, 32, "%d", fp_iterator.extensible_param_index());
if ((res >= 32) || (res < 0)) ERROR;
param_name = new identifier_c(strdup2(param_name->value, tmp));
if (param_name->value == NULL) ERROR;
}
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();
symbol_c *param_value = NULL;
/* Get the value from a foo(<param_name> = <param_value>) style call */
if (param_value == NULL)
param_value = function_call_param_iterator.search_f(param_name);
/* Get the value from a foo(<param_value>) style call */
if ((param_value == NULL) && !fp_iterator.is_en_eno_param_implicit()) {
param_value = function_call_param_iterator.next_nf();
}
/* if no more parameter values in function call, and the current parameter
* of the function declaration is an extensible parameter, we
* have reached the end, and should simply jump out of the for loop.
*/
if ((param_value == NULL) && (fp_iterator.is_extensible_param())) {
break;
}
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) {
has_output_params = true;
}
}
}
/* Check whether we are calling an overloaded function! */
/* (fdecl_mutiplicity > 1) => calling overloaded function */
int fdecl_mutiplicity = function_symtable.count(symbol->function_name);
if (fdecl_mutiplicity == 0) ERROR;
if (has_output_params) {
fcall_number++;
s4o.print("__");
fbname->accept(*this);
s4o.print("_");
function_name->accept(*this);
if (fdecl_mutiplicity > 1) {
/* function being called is overloaded! */
s4o.print("__");
print_function_parameter_data_types_c overloaded_func_suf(&s4o);
f_decl->accept(overloaded_func_suf);
}
s4o.print(fcall_number);
}
else {
function_name->accept(*this);
if (fdecl_mutiplicity > 1) {
/* function being called is overloaded! */
s4o.print("__");
print_function_parameter_data_types_c overloaded_func_suf(&s4o);
f_decl->accept(overloaded_func_suf);
}
}
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 = type_initial_value_c::get(current_param_type);
}
if (param_value == NULL) ERROR;
s4o.print("(");
if (get_datatype_info_c::is_ANY_INT_literal(current_param_type))
get_datatype_info_c::lint_type_name.accept(*this);
else if (get_datatype_info_c::is_ANY_REAL_literal(current_param_type))
get_datatype_info_c::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_type_id(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 */
/*****************************************/
void *visit(return_statement_c *symbol) {
s4o.print("goto "); s4o.print(END_LABEL);
return NULL;
}
/* 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 */
/* When using the informal invocation style, user can not pass values to EN or ENO parameters if these
* were implicitly defined!
*/
if ((param_value == NULL) && !fp_iterator.is_en_eno_param_implicit())
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("(");
if (search_var_instance_decl->get_vartype(symbol->fb_name) != search_var_instance_decl_c::external_vt)
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 */
/* When using the informal invocation style, user can not pass values to EN or ENO parameters if these
* were implicitly defined!
*/
if ((param_value == NULL) && !fp_iterator.is_en_eno_param_implicit())
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_type_id(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) {
symbol_c *expression_type = symbol->expression->datatype;
s4o.print("{\n");
s4o.indent_right();
s4o.print(s4o.indent_spaces);
if (get_datatype_info_c::is_ANY_INT_literal(expression_type))
get_datatype_info_c::lint_type_name.accept(*this);
else if (get_datatype_info_c::is_ANY_REAL_literal(expression_type))
get_datatype_info_c::lreal_type_name.accept(*this);
else
expression_type->accept(*this);
s4o.print(" __case_expression = ");
symbol->expression->accept(*this);
s4o.print(";\n" + s4o.indent_spaces + "switch (__case_expression) {\n");
s4o.indent_right();
wanted_casegeneration = single_cg;
symbol->case_element_list->accept(*this);
wanted_casegeneration = subrange_cg;
s4o.print(s4o.indent_spaces + "default:\n");
s4o.indent_right();
first_subrange_case_list = true;
symbol->case_element_list->accept(*this);
if (symbol->statement_list != NULL) {
if (!first_subrange_case_list) {
s4o.print(s4o.indent_spaces + "else {\n");
s4o.indent_right();
}
symbol->statement_list->accept(*this);
if (!first_subrange_case_list) {
s4o.indent_left();
s4o.print(s4o.indent_spaces + "}\n");
}
}
s4o.print(s4o.indent_spaces + "break;\n");
s4o.indent_left();
wanted_casegeneration = none_cg;
s4o.indent_left();
s4o.print(s4o.indent_spaces + "}\n");
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) {
case_element_iterator_c *case_element_iterator;
symbol_c* element = NULL;
bool first_element = true;
switch (wanted_casegeneration) {
case single_cg:
case_element_iterator = new case_element_iterator_c(symbol->case_list, case_element_iterator_c::element_single);
for (element = case_element_iterator->next(); element != NULL; element = case_element_iterator->next()) {
if (first_element) first_element = false;
s4o.print(s4o.indent_spaces + "case ");
element->accept(*this);
s4o.print(":\n");
}
delete case_element_iterator;
break;
case subrange_cg:
case_element_iterator = new case_element_iterator_c(symbol->case_list, case_element_iterator_c::element_subrange);
for (element = case_element_iterator->next(); element != NULL; element = case_element_iterator->next()) {
if (first_element) {
if (first_subrange_case_list) {
s4o.print(s4o.indent_spaces + "if (");
first_subrange_case_list = false;
}
else {
s4o.print(s4o.indent_spaces + "else if (");
}
first_element = false;
}
else {
s4o.print(" && ");
}
element->accept(*this);
}
delete case_element_iterator;
if (!first_element) {
s4o.print(") {\n");
}
break;
default:
break;
}
if (!first_element) {
s4o.indent_right();
symbol->statement_list->accept(*this);
switch (wanted_casegeneration) {
case single_cg:
s4o.print(s4o.indent_spaces + "break;\n");
s4o.indent_left();
break;
case subrange_cg:
s4o.indent_left();
s4o.print(s4o.indent_spaces + "}\n");
break;
default:
break;
}
}
return NULL;
}
/********************************/
/* 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("; ");
if (symbol->by_expression == NULL) {
/* increment by 1 */
symbol->control_variable->accept(*this);
s4o.print(" <= ");
symbol->end_expression->accept(*this);
s4o.print("; ");
symbol->control_variable->accept(*this);
s4o.print("++");
} else {
/* increment by user defined value */
/* The user defined increment value may be negative, in which case
* the expression to determine whether we have reached the end of the loop
* changes from a '<=' to a '>='.
* Since the increment value may change during runtime (remember, it is
* an expression, so may contain variables), choosing which test
* to use has to be done at runtime.
*/
s4o.print("((");
symbol->by_expression->accept(*this);
s4o.print(") > 0)? (");
symbol->control_variable->accept(*this);
s4o.print(" <= (");
symbol->end_expression->accept(*this);
s4o.print(")) : (");
symbol->control_variable->accept(*this);
s4o.print(" >= (");
symbol->end_expression->accept(*this);
s4o.print(")); ");
symbol->control_variable->accept(*this);
s4o.print(" += (");
symbol->by_expression->accept(*this);
s4o.print(")");
}
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("break");
return NULL;
}
}; /* generate_c_st_c */