Adding support for EN/ENO params in function and function blocks (standard function not supported yet)
/*
* (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 variable declaration constructs.
*
* This is part of the 4th stage that generates
* a c++ source program equivalent to the IL and ST
* code.
*/
//#include <stdio.h> /* required for NULL */
//#include <string>
//#include <iostream>
//#include "../../util/symtable.hh"
class generate_c_array_initialization_c: public generate_c_typedecl_c {
public:
typedef enum {
none_am,
dimensioncount_am,
initializationvalue_am,
arrayassignment_am,
varlistparse_am
} arrayinitialization_mode_t;
arrayinitialization_mode_t current_mode;
symbol_c* array_default_value;
private:
int dimension_number, current_dimension, array_size;
public:
generate_c_array_initialization_c(stage4out_c *s4o_ptr): generate_c_typedecl_c(s4o_ptr) {}
~generate_c_array_initialization_c(void) {}
void init_array(symbol_c *var1_list, symbol_c *array_specification, symbol_c *array_initialization) {
int i;
dimension_number = 0;
current_dimension = 0;
array_size = 1;
array_default_value = NULL;
current_mode = dimensioncount_am;
array_specification->accept(*this);
current_mode = initializationvalue_am;
s4o.print("\n");
s4o.print(s4o.indent_spaces + "{\n");
s4o.indent_right();
s4o.print(s4o.indent_spaces + "int index[");
print_integer(dimension_number);
s4o.print("];\n");
s4o.print(s4o.indent_spaces);
array_specification->accept(*this);
s4o.print(" temp = ");
array_initialization->accept(*this);
s4o.print(";\n");
current_mode = arrayassignment_am;
array_specification->accept(*this);
current_mode = varlistparse_am;
var1_list->accept(*this);
current_mode = arrayassignment_am;
for (i = 0; i < dimension_number; i++) {
s4o.indent_left();
s4o.print(s4o.indent_spaces + "}\n");
}
s4o.indent_left();
s4o.print(s4o.indent_spaces + "}");
}
void *visit(identifier_c *type_name) {
symbol_c *type_decl;
switch (current_mode) {
case dimensioncount_am:
case arrayassignment_am:
/* look up the type declaration... */
type_decl = type_symtable.find_value(type_name);
if (type_decl == type_symtable.end_value())
/* Type declaration not found!! */
ERROR;
type_decl->accept(*this);
break;
default:
print_token(type_name);
break;
}
return NULL;
}
void *visit(var1_list_c *symbol) {
int i, j;
for (i = 0; i < symbol->n; i++) {
s4o.print(s4o.indent_spaces);
print_variable_prefix();
symbol->elements[i]->accept(*this);
for (j = 0; j < dimension_number; j++) {
s4o.print("[index[");
print_integer(j);
s4o.print("]]");
}
s4o.print(" = temp");
for (j = 0; j < dimension_number; j++) {
s4o.print("[index[");
print_integer(j);
s4o.print("]]");
}
s4o.print(";\n");
}
return NULL;
}
/********************************/
/* B 1.3.3 - Derived data types */
/********************************/
/* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
void *visit(array_specification_c *symbol) {
switch (current_mode) {
case dimensioncount_am:
symbol->array_subrange_list->accept(*this);
array_default_value = (symbol_c *)symbol->non_generic_type_name->accept(*type_initial_value_c::instance());;
break;
default:
symbol->array_subrange_list->accept(*this);
break;
}
return NULL;
}
/* signed_integer DOTDOT signed_integer */
//SYM_REF2(subrange_c, lower_limit, upper_limit)
void *visit(subrange_c *symbol) {
switch (current_mode) {
case dimensioncount_am:
dimension_number++;
array_size *= extract_integer(symbol->upper_limit) - extract_integer(symbol->lower_limit) + 1;
break;
case arrayassignment_am:
s4o.print(s4o.indent_spaces + "for (index[");
print_integer(current_dimension);
s4o.print("] = 0; index[");
print_integer(current_dimension);
s4o.print("] <= ");
print_integer(extract_integer(symbol->upper_limit) - extract_integer(symbol->lower_limit));
s4o.print("; index[");
print_integer(current_dimension);
s4o.print("]++) {\n");
s4o.indent_right();
current_dimension++;
break;
default:
break;
}
return NULL;
}
/* helper symbol for array_initialization */
/* array_initial_elements_list ',' array_initial_elements */
void *visit(array_initial_elements_list_c *symbol) {
switch (current_mode) {
case initializationvalue_am:
int i;
s4o.print("{");
for (i = 0; i < symbol->n; i++) {
if (i > 0)
s4o.print(", ");
symbol->elements[i]->accept(*this);
array_size--;
}
if (array_size > 0) {
if (symbol->n > 0)
s4o.print(", ");
for (i = 0; i < array_size; i++) {
if (i > 0)
s4o.print(", ");
array_default_value->accept(*this);
}
}
s4o.print("}");
break;
default:
break;
}
return NULL;
}
/* integer '(' [array_initial_element] ')' */
/* array_initial_element may be NULL ! */
void *visit(array_initial_elements_c *symbol) {
int initial_element_number;
switch (current_mode) {
case initializationvalue_am:
initial_element_number = extract_integer(symbol->integer);
for (int i = 0; i < initial_element_number; i++) {
if (i > 0)
s4o.print(", ");
if (symbol->array_initial_element != NULL)
symbol->array_initial_element->accept(*this);
else if (array_default_value != NULL)
array_default_value->accept(*this);
}
if (initial_element_number > 1)
array_size -= initial_element_number - 1;
break;
default:
break;
}
return NULL;
}
};
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
class generate_c_vardecl_c: protected generate_c_typedecl_c {
/* A Helper class to the main class... */
/* print a string, except the first time it is called */
/* used to print the separator "," before each variable
* declaration, except the first...
*
* Needs to be done in a seperate class because this is called
* from within various locations within the code.
*/
class next_var_c {
private:
bool print_flag;
std::string str1, str2;
next_var_c *embedded_scope;
public:
next_var_c(std::string s1, std::string s2) {
str1 = s1;
str2 = s2;
print_flag = false;
embedded_scope = NULL;
}
std::string get(void) {
if (NULL != embedded_scope)
return embedded_scope->get();
bool old_print_flag = print_flag;
print_flag = true;
if (!old_print_flag)
return str1;
else
return str2;
}
/* Create a new next_var_c for an embedded scope.
* From now on, every call to get() will return the
* inner-most scope...!
*/
void push(std::string s1, std::string s2) {
if (NULL != embedded_scope)
return embedded_scope->push(s1, s2);
embedded_scope = new next_var_c(s1, s2);
if (NULL == embedded_scope)
ERROR;
return;
}
/* Remove the inner-most scope... */
void pop(void) {
if (NULL != embedded_scope)
return embedded_scope->pop();
delete embedded_scope;
embedded_scope = NULL;
}
};
private:
/* used to generate the ',' separating the parameters in a function call */
next_var_c *nv;
public:
/* the types of variables that need to be processed... */
static const unsigned int none_vt = 0x0000;
static const unsigned int input_vt = 0x0001; // VAR_INPUT
static const unsigned int output_vt = 0x0002; // VAR_OUTPUT
static const unsigned int inoutput_vt = 0x0004; // VAR_IN_OUT
static const unsigned int private_vt = 0x0008; // VAR
static const unsigned int temp_vt = 0x0010; // VAR_TEMP
static const unsigned int external_vt = 0x0020; // VAR_EXTERNAL
static const unsigned int global_vt = 0x0040; // VAR_GLOBAL
// Globals declared inside a resource will not be declared
// unless global_vt is acompanied by resource_vt
static const unsigned int located_vt = 0x0080; // VAR <var_name> AT <location>
static const unsigned int program_vt = 0x0100; // PROGRAM (inside a configuration!)
// Programs declared inside a resource will not be declared
// unless program_vt is acompanied by resource_vt
static const unsigned int eneno_vt = 0x0200; // EN/ENO declaration
static const unsigned int resource_vt = 0x8000; // RESOURCE (inside a configuration!)
// This, just of itself, will not print out any declarations!!
// It must be acompanied by either program_vt and/or global_vt
/* How variables should be declared: as local variables or
* variables within a function call interface.
*
* This will define the format of the output generated
* by this class.
*
* finterface_vf: function interface parameters
* e.g. f( int a, long b, real c );
* ---------------------
* This class/function will produce the
* underlined code of the above examples,
* and no more!!
*
* localinit_vf: local declaration. Will include variable
* initialisation if it is not a located variable.
* e.g.
* int a = 9;
* long b = 99;
* real c = 99.9;
*
* local_vf: local declaration. Will NOT include variable
* initialisation.
* e.g.
* int a;
* long b;
* real c;
*
* init_vf: local initialisation without declaration.
* e.g.
* a = 9;
* b = 99;
* c = 99.9;
*
* constructorinit_vf: initialising of member variables...
* e.g. for a constructor...
* class_name_c(void)
* : a(9), b(99), c(99.9) { // code... }
* --------------------
* This class/function will produce the
* underlined code of the above examples,
* and no more!!
*
* globalinit_vf: initialising of static c++ variables. These
* variables may have been declared as static inside
* a class, in which case the scope within which they were
* previously delcared must be passed as the second parameter
* to the print() function.
*
* e.g.
* __plc_pt_c<INT, 8*sizeof(INT)> START_P::loc = __plc_pt_c<INT, 8*sizeof(INT)>("I2");
*/
typedef enum {finterface_vf,
foutputassign_vf,
local_vf,
localinit_vf,
init_vf,
constructorinit_vf,
globalinit_vf
} varformat_t;
private:
generate_c_array_initialization_c *generate_c_array_initialization;
/* variable used to store the types of variables that need to be processed... */
/* Only set in the constructor...! */
/* Will contain a set of values of generate_c_vardecl_c::XXXX_vt */
unsigned int wanted_vartype;
/* variable used to store the type of variable currently being processed... */
/* Will contain a single value of generate_c_vardecl_c::XXXX_vt */
unsigned int current_vartype;
/* How variables should be declared: as local variables or
* variables within a function interface...
*/
/* Only set in the constructor...! */
varformat_t wanted_varformat;
/* The number of variables already declared. */
/* Used to declare 'void' in case no variables are declared in a function interface... */
int finterface_var_count;
/* Current parsed resource name, for resource
* specific global variable declaration (with #define...)*/
symbol_c *resource_name;
/* Store if En and ENO parameters have been defined by user */
bool en_declared;
bool eno_declared;
/* Holds the references to the type and initial value
* of the variables currently being declared.
* Please read the comment under var1_init_decl_c for further
* details...
*
* We make an effort to keep these pointers pointing to NULL
* whenever we are outside the scope of variable declaration
* (i.e. when we are traversing a part of the parse tree which
* is not part of variable declaration) in order tio try to catch
* any bugs as soon as possible.
*/
symbol_c *current_var_type_symbol;
symbol_c *current_var_init_symbol;
void update_type_init(symbol_c *symbol /* a spec_init_c, subrange_spec_init_c, etc... */ ) {
this->current_var_type_symbol = spec_init_sperator_c::get_spec(symbol);
this->current_var_init_symbol = spec_init_sperator_c::get_init(symbol);
if (NULL == this->current_var_type_symbol)
ERROR;
if (NULL == this->current_var_init_symbol) {
/* We try to find the data type's default value... */
this->current_var_init_symbol = (symbol_c *)this->current_var_type_symbol->accept(*type_initial_value_c::instance());
/* Note that Function Block 'data types' do not have a default value, so we cannot abort if no default value is found! */
/*
if (NULL == this->current_var_init_symbol)
ERROR;
*/
}
}
void void_type_init(void) {
this->current_var_type_symbol = NULL;
this->current_var_init_symbol = NULL;
}
/* Only used when wanted_varformat == globalinit_vf
* Holds a pointer to an identifier_c, which in turns contains
* the identifier of the scope within which the static member was
* declared.
*/
symbol_c *globalnamespace;
/* Actually produce the output where variables are declared... */
/* Note that located variables are the exception, they
* being declared in the located_var_decl_c visitor...
*/
void *declare_variables(symbol_c *symbol, bool is_fb = false) {
list_c *list = dynamic_cast<list_c *>(symbol);
/* should NEVER EVER occur!! */
if (list == NULL) ERROR;
/* now to produce the c equivalent... */
if ((wanted_varformat == local_vf) ||
(wanted_varformat == init_vf) ||
(wanted_varformat == localinit_vf)) {
for(int i = 0; i < list->n; i++) {
s4o.print(s4o.indent_spaces);
if (wanted_varformat != init_vf) {
this->current_var_type_symbol->accept(*this);
s4o.print(" ");
}
print_variable_prefix();
list->elements[i]->accept(*this);
if (wanted_varformat != local_vf) {
if (this->current_var_init_symbol != NULL) {
s4o.print(" = ");
this->current_var_init_symbol->accept(*this);
}
}
s4o.print(";\n");
}
}
if (wanted_varformat == finterface_vf) {
for(int i = 0; i < list->n; i++) {
finterface_var_count++;
s4o.print(nv->get());
s4o.print("\n" + s4o.indent_spaces);
this->current_var_type_symbol->accept(*this);
if ((current_vartype & (output_vt | inoutput_vt)) != 0)
s4o.print(" *__");
else
s4o.print(" ");
list->elements[i]->accept(*this);
/* We do not print the initial value at function declaration!
* It is up to the caller to pass the correct default value
* if none is specified in the ST source code
*/
/* if (this->current_var_init_symbol != NULL) {
s4o.print(" = "); this->current_var_init_symbol->accept(*this);}
*/
}
}
if (wanted_varformat == foutputassign_vf) {
for(int i = 0; i < list->n; i++) {
if ((current_vartype & (output_vt | inoutput_vt)) != 0) {
s4o.print(s4o.indent_spaces + "if (__");
list->elements[i]->accept(*this);
s4o.print(" != NULL) {\n");
s4o.indent_right();
s4o.print(s4o.indent_spaces + "*__");
list->elements[i]->accept(*this);
s4o.print(" = ");
list->elements[i]->accept(*this);
s4o.print(";\n");
s4o.indent_left();
s4o.print(s4o.indent_spaces + "}\n");
}
}
}
if (wanted_varformat == constructorinit_vf) {
for(int i = 0; i < list->n; i++) {
if (is_fb) {
s4o.print(nv->get());
this->current_var_type_symbol->accept(*this);
s4o.print(FB_INIT_SUFFIX);
s4o.print("(&");
this->print_variable_prefix();
list->elements[i]->accept(*this);
s4o.print(");");
}
else if (this->current_var_init_symbol != NULL) {
s4o.print(nv->get());
this->print_variable_prefix();
list->elements[i]->accept(*this);
s4o.print(" = ");
this->current_var_init_symbol->accept(*this);
s4o.print(";");
}
}
}
return NULL;
}
public:
generate_c_vardecl_c(stage4out_c *s4o_ptr, varformat_t varformat, unsigned int vartype, symbol_c* res_name = NULL)
: generate_c_typedecl_c(s4o_ptr) {
generate_c_array_initialization = new generate_c_array_initialization_c(s4o_ptr);
wanted_varformat = varformat;
wanted_vartype = vartype;
current_vartype = none_vt;
current_var_type_symbol = NULL;
current_var_init_symbol = NULL;
globalnamespace = NULL;
nv = NULL;
resource_name = res_name;
en_declared = false;
eno_declared = false;
}
~generate_c_vardecl_c(void) {
delete generate_c_array_initialization;
}
bool is_en_declared(void) {
return en_declared;
}
bool is_eno_declared(void) {
return eno_declared;
}
void print(symbol_c *symbol, symbol_c *scope = NULL, const char *variable_prefix = NULL) {
this->set_variable_prefix(variable_prefix);
this->generate_c_array_initialization->set_variable_prefix(variable_prefix);
if (globalinit_vf == wanted_varformat)
globalnamespace = scope;
finterface_var_count = 0;
switch (wanted_varformat) {
case constructorinit_vf: nv = new next_var_c("", "\n"+s4o.indent_spaces); break;
case finterface_vf: /* fall through... */
case localinit_vf: /* fall through... */
case local_vf: nv = new next_var_c("", ", "); break;
default: nv = NULL;
} /* switch() */
symbol->accept(*this);
/* special case... */
if (wanted_varformat == finterface_vf)
if (finterface_var_count == 0)
s4o.print("void");
delete nv;
nv = NULL;
globalnamespace = NULL;
}
protected:
/***************************/
/* B 0 - Programming Model */
/***************************/
/* leave for derived classes... */
/*************************/
/* B.1 - Common elements */
/*************************/
/*******************************************/
/* B 1.1 - Letters, digits and identifiers */
/*******************************************/
/* done in base class(es) */
/*********************/
/* B 1.2 - Constants */
/*********************/
/* originally empty... */
/******************************/
/* B 1.2.1 - Numeric Literals */
/******************************/
/* done in base class(es) */
/*******************************/
/* B.1.2.2 Character Strings */
/*******************************/
/* done in base class(es) */
/***************************/
/* B 1.2.3 - Time Literals */
/***************************/
/************************/
/* B 1.2.3.1 - Duration */
/************************/
/* done in base class(es) */
/************************************/
/* B 1.2.3.2 - Time of day and Date */
/************************************/
/* done in base class(es) */
/**********************/
/* B.1.3 - Data types */
/**********************/
/***********************************/
/* B 1.3.1 - Elementary Data Types */
/***********************************/
/* done in base class(es) */
/********************************/
/* B.1.3.2 - Generic data types */
/********************************/
/* originally empty... */
/********************************/
/* B 1.3.3 - Derived data types */
/********************************/
/* done in base class(es) */
/*********************/
/* B 1.4 - Variables */
/*********************/
/* done in base class(es) */
/********************************************/
/* B.1.4.1 Directly Represented Variables */
/********************************************/
/* done in base class(es) */
/*************************************/
/* B.1.4.2 Multi-element Variables */
/*************************************/
/* done in base class(es) */
/******************************************/
/* B 1.4.3 - Declaration & Initialisation */
/******************************************/
void *visit(constant_option_c *symbol) {s4o.print("CONSTANT"); return NULL;}
void *visit(retain_option_c *symbol) {s4o.print("RETAIN"); return NULL;}
void *visit(non_retain_option_c *symbol) {s4o.print("NON_RETAIN"); return NULL;}
void *visit(input_declarations_c *symbol) {
TRACE("input_declarations_c");
if ((wanted_vartype & input_vt) != 0) {
/*
// TO DO ...
if (symbol->option != NULL)
symbol->option->accept(*this);
*/
//s4o.indent_right();
current_vartype = input_vt;
symbol->input_declaration_list->accept(*this);
current_vartype = none_vt;
//s4o.indent_left();
}
return NULL;
}
/* helper symbol for input_declarations */
void *visit(input_declaration_list_c *symbol) {
TRACE("input_declaration_list_c");
print_list(symbol);
return NULL;
}
void *visit(edge_declaration_c *symbol) {
TRACE("edge_declaration_c");
// TO DO ...
symbol->var1_list->accept(*this);
s4o.print(" : BOOL ");
symbol->edge->accept(*this);
return NULL;
}
void *visit(en_param_declaration_c *symbol) {
TRACE("en_declaration_c");
if (en_declared) ERROR;
if (wanted_varformat == finterface_vf) {
finterface_var_count++;
}
if ((current_vartype & eneno_vt) != 0) {
if (wanted_varformat == finterface_vf) {
s4o.print(nv->get());
s4o.print("\n" + s4o.indent_spaces + "BOOL EN");
}
if (wanted_varformat == constructorinit_vf) {
s4o.print(nv->get());
this->print_variable_prefix();
s4o.print("ENO = __BOOL_LITERAL(TRUE);");
}
}
en_declared = true;
return NULL;
}
void *visit(raising_edge_option_c *symbol) {
// TO DO ...
s4o.print("R_EDGE");
return NULL;
}
/* var1_list ':' array_spec_init */
// SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init)
void *visit(array_var_init_decl_c *symbol) {
TRACE("array_var_init_decl_c");
/* Please read the comments inside the var1_init_decl_c
* visitor, as they apply here too.
*/
/* Start off by setting the current_var_type_symbol and
* current_var_init_symbol private variables...
*/
update_type_init(symbol->array_spec_init);
/* now to produce the c equivalent... */
if (wanted_varformat == constructorinit_vf)
generate_c_array_initialization->init_array(symbol->var1_list, this->current_var_type_symbol, this->current_var_init_symbol);
else
symbol->var1_list->accept(*this);
/* Values no longer in scope, and therefore no longer used.
* Make an effort to keep them set to NULL when not in use
* in order to catch bugs as soon as possible...
*/
void_type_init();
return NULL;
}
/* var1_list ':' initialized_structure */
// SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure)
void *visit(structured_var_init_decl_c *symbol) {
TRACE("structured_var_init_decl_c");
/* Please read the comments inside the var1_init_decl_c
* visitor, as they apply here too.
*/
/* Start off by setting the current_var_type_symbol and
* current_var_init_symbol private variables...
*/
update_type_init(symbol->initialized_structure);
/* now to produce the c equivalent... */
symbol->var1_list->accept(*this);
/* Values no longer in scope, and therefore no longer used.
* Make an effort to keep them set to NULL when not in use
* in order to catch bugs as soon as possible...
*/
void_type_init();
return NULL;
}
/* fb_name_list ':' function_block_type_name ASSIGN structure_initialization */
/* structure_initialization -> may be NULL ! */
void *visit(fb_name_decl_c *symbol) {
TRACE("fb_name_decl_c");
/* Please read the comments inside the var1_init_decl_c
* visitor, as they apply here too.
*/
/* Start off by setting the current_var_type_symbol and
* current_var_init_symbol private variables...
*/
update_type_init(symbol);
/* now to produce the c equivalent... */
symbol->fb_name_list->accept(*this);
/* Values no longer in scope, and therefore no longer used.
* Make an effort to keep them set to NULL when not in use
* in order to catch bugs as soon as possible...
*/
void_type_init();
return NULL;
}
/* fb_name_list ',' fb_name */
void *visit(fb_name_list_c *symbol) {
TRACE("fb_name_list_c");
declare_variables(symbol, true);
return NULL;
}
/* VAR_OUTPUT [RETAIN | NON_RETAIN] var_init_decl_list END_VAR */
/* option -> may be NULL ! */
void *visit(output_declarations_c *symbol) {
TRACE("output_declarations_c");
if ((wanted_vartype & output_vt) != 0) {
/*
// TO DO ...
if (symbol->option != NULL)
symbol->option->accept(*this);
*/
//s4o.indent_right();
current_vartype = output_vt;
symbol->var_init_decl_list->accept(*this);
current_vartype = none_vt;
//s4o.indent_left();
}
return NULL;
}
void *visit(eno_param_declaration_c *symbol) {
TRACE("eno_declaration_c");
if (eno_declared) ERROR;
if (wanted_varformat == finterface_vf) {
finterface_var_count++;
}
if ((current_vartype & eneno_vt) != 0) {
if (wanted_varformat == finterface_vf) {
s4o.print(nv->get());
s4o.print("\n" + s4o.indent_spaces + "BOOL *EN0");
}
if (wanted_varformat == constructorinit_vf) {
s4o.print(nv->get());
this->print_variable_prefix();
s4o.print("ENO = __BOOL_LITERAL(TRUE);");
}
}
eno_declared = true;
return NULL;
}
/* VAR_IN_OUT var_declaration_list END_VAR */
void *visit(input_output_declarations_c *symbol) {
TRACE("input_output_declarations_c");
if ((wanted_vartype & inoutput_vt) != 0) {
//s4o.indent_right();
current_vartype = inoutput_vt;
symbol->var_declaration_list->accept(*this);
current_vartype = none_vt;
//s4o.indent_left();
}
return NULL;
}
/* helper symbol for input_output_declarations */
/* var_declaration_list var_declaration ';' */
void *visit(var_declaration_list_c *symbol) {
TRACE("var_declaration_list_c");
print_list(symbol);
return NULL;
}
#if 0
/* var1_list ':' array_specification */
SYM_REF2(array_var_declaration_c, var1_list, array_specification)
#endif
void *visit(array_initial_elements_list_c *symbol) {
s4o.print(";// array initialisation");
return NULL;
}
/* var1_list ':' structure_type_name */
//SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name)
void *visit(structured_var_declaration_c *symbol) {
TRACE("structured_var_declaration_c");
/* Please read the comments inside the var1_init_decl_c
* visitor, as they apply here too.
*/
/* Start off by setting the current_var_type_symbol and
* current_var_init_symbol private variables...
*/
update_type_init(symbol->structure_type_name);
/* now to produce the c equivalent... */
symbol->var1_list->accept(*this);
/* Values no longer in scope, and therefore no longer used.
* Make an effort to keep them set to NULL when not in use
* in order to catch bugs as soon as possible...
*/
void_type_init();
return NULL;
}
/* VAR [CONSTANT] var_init_decl_list END_VAR */
/* option -> may be NULL ! */
/* helper symbol for input_declarations */
void *visit(var_declarations_c *symbol) {
TRACE("var_declarations_c");
if ((wanted_vartype & private_vt) != 0) {
/*
// TO DO ...
if (symbol->option != NULL)
symbol->option->accept(*this);
*/
current_vartype = private_vt;
symbol->var_init_decl_list->accept(*this);
current_vartype = none_vt;
}
return NULL;
}
/* VAR RETAIN var_init_decl_list END_VAR */
void *visit(retentive_var_declarations_c *symbol) {
TRACE("retentive_var_declarations_c");
if ((wanted_vartype & private_vt) != 0) {
current_vartype = private_vt;
symbol->var_init_decl_list->accept(*this);
current_vartype = none_vt;
}
return NULL;
}
/* VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */
/* option -> may be NULL ! */
//SYM_REF2(located_var_declarations_c, option, located_var_decl_list)
void *visit(located_var_declarations_c *symbol) {
TRACE("located_var_declarations_c");
if ((wanted_vartype & located_vt) != 0) {
/*
// TO DO ...
if (symbol->option != NULL)
symbol->option->accept(*this);
*/
current_vartype = located_vt;
symbol->located_var_decl_list->accept(*this);
current_vartype = none_vt;
}
return NULL;
}
/* helper symbol for located_var_declarations */
/* located_var_decl_list located_var_decl ';' */
//SYM_LIST(located_var_decl_list_c)
void *visit(located_var_decl_list_c *symbol) {
TRACE("located_var_decl_list_c");
print_list(symbol);
return NULL;
}
/* [variable_name] location ':' located_var_spec_init */
/* variable_name -> may be NULL ! */
//SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)
void *visit(located_var_decl_c *symbol) {
TRACE("located_var_decl_c");
/* Please read the comments inside the var1_init_decl_c
* visitor, as they apply here too.
*/
/* Start off by setting the current_var_type_symbol and
* current_var_init_symbol private variables...
*/
update_type_init(symbol->located_var_spec_init);
/* now to produce the c equivalent... */
switch(wanted_varformat) {
case local_vf:
s4o.print(s4o.indent_spaces);
this->current_var_type_symbol->accept(*this);
s4o.print(" *");
if (symbol->variable_name != NULL)
symbol->variable_name->accept(*this);
else
symbol->location->accept(*this);
s4o.print(";\n");
break;
case constructorinit_vf:
s4o.print(nv->get());
s4o.print("{extern ");
this->current_var_type_symbol->accept(*this);
s4o.print("* ");
symbol->location->accept(*this);
s4o.print("; ");
print_variable_prefix();
if (symbol->variable_name != NULL)
symbol->variable_name->accept(*this);
else
symbol->location->accept(*this);
s4o.print(" = ");
symbol->location->accept(*this);
s4o.print(";}");
break;
case globalinit_vf:
s4o.print(s4o.indent_spaces + "__plc_pt_c<");
this->current_var_type_symbol->accept(*this);
s4o.print(", 8*sizeof(");
this->current_var_type_symbol->accept(*this);
s4o.print(")> ");
if (this->globalnamespace != NULL) {
this->globalnamespace->accept(*this);
s4o.print("::");
}
if (symbol->variable_name != NULL)
symbol->variable_name->accept(*this);
else
symbol->location->accept(*this);
s4o.print(" = ");
s4o.print(s4o.indent_spaces + "__plc_pt_c<");
this->current_var_type_symbol->accept(*this);
s4o.print(", 8*sizeof(");
this->current_var_type_symbol->accept(*this);
s4o.print(")>(\"");
symbol->location->accept(*this);
s4o.print("\"");
if (this->current_var_init_symbol != NULL) {
s4o.print(", ");
this->current_var_init_symbol->accept(*this);
}
s4o.print(");\n");
break;
default:
ERROR;
} /* switch() */
/* Values no longer in scope, and therefore no longer used.
* Make an effort to keep them set to NULL when not in use
* in order to catch bugs as soon as possible...
*/
void_type_init();
return NULL;
}
/*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */
/* option -> may be NULL ! */
//SYM_REF2(external_var_declarations_c, option, external_declaration_list)
void *visit(external_var_declarations_c *symbol) {
TRACE("external_var_declarations_c");
if ((wanted_vartype & external_vt) != 0) {
/*
// TODO ...
if (symbol->option != NULL)
symbol->option->accept(*this);
*/
//s4o.indent_right();
current_vartype = external_vt;
symbol->external_declaration_list->accept(*this);
current_vartype = none_vt;
//s4o.indent_left();
}
return NULL;
}
/* helper symbol for external_var_declarations */
/*| external_declaration_list external_declaration';' */
//SYM_LIST(external_declaration_list_c)
/* helper symbol for input_declarations */
void *visit(external_declaration_list_c *symbol) {
TRACE("external_declaration_list_c");
print_list(symbol);
return NULL;
}
/* global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */
//SYM_REF2(external_declaration_c, global_var_name, specification)
void *visit(external_declaration_c *symbol) {
TRACE("external_declaration_c");
/* Please read the comments inside the var1_init_decl_c
* visitor, as they apply here too.
*/
/* Start off by setting the current_var_type_symbol and
* current_var_init_symbol private variables...
*/
this->current_var_type_symbol = symbol->specification;
this->current_var_init_symbol = NULL;
/* now to produce the c equivalent... */
switch (wanted_varformat) {
case local_vf:
case localinit_vf:
s4o.print(s4o.indent_spaces);
this->current_var_type_symbol->accept(*this);
s4o.print(" *");
symbol->global_var_name->accept(*this);
if ((wanted_varformat == localinit_vf) &&
(this->current_var_init_symbol != NULL)) {
s4o.print(" = ");
this->current_var_init_symbol->accept(*this);
}
s4o.print(";\n");
break;
case constructorinit_vf:
s4o.print(nv->get());
s4o.print("{extern ");
this->current_var_type_symbol->accept(*this);
s4o.print(" *");
symbol->global_var_name->accept(*this);
s4o.print("; ");
print_variable_prefix();
symbol->global_var_name->accept(*this);
s4o.print(" = ");
symbol->global_var_name->accept(*this);
s4o.print(";}");
break;
case finterface_vf:
finterface_var_count++;
s4o.print(nv->get());
this->current_var_type_symbol->accept(*this);
s4o.print(" *");
symbol->global_var_name->accept(*this);
break;
default:
ERROR;
}
/* Values no longer in scope, and therefore no longer used.
* Make an effort to keep them set to NULL when not in use
* in order to catch bugs as soon as possible...
*/
void_type_init();
return NULL;
}
/*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */
/* option -> may be NULL ! */
// SYM_REF2(global_var_declarations_c, option, global_var_decl_list)
void *visit(global_var_declarations_c *symbol) {
TRACE("global_var_declarations_c");
if ((wanted_vartype & global_vt) != 0) {
/*
// TODO ...
if (symbol->option != NULL)
symbol->option->accept(*this);
*/
//s4o.indent_right();
unsigned int previous_vartype = current_vartype;
// previous_vartype will be either none_vt, or resource_vt
current_vartype = global_vt;
symbol->global_var_decl_list->accept(*this);
current_vartype = previous_vartype;
//s4o.indent_left();
}
return NULL;
}
/* helper symbol for global_var_declarations */
/*| global_var_decl_list global_var_decl ';' */
//SYM_LIST(global_var_decl_list_c)
void *visit(global_var_decl_list_c *symbol) {
TRACE("global_var_decl_list_c");
print_list(symbol);
return NULL;
}
/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
/* type_specification ->may be NULL ! */
// SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
void *visit(global_var_decl_c *symbol) {
TRACE("global_var_decl_c");
/* Please read the comments inside the var1_init_decl_c
* visitor, as they apply here too.
*/
/* Start off by setting the current_var_type_symbol and
* current_var_init_symbol private variables...
*/
update_type_init(symbol->type_specification);
/* now to produce the c equivalent... */
symbol->global_var_spec->accept(*this);
/* Values no longer in scope, and therefore no longer used.
* Make an effort to keep them set to NULL when not in use
* in order to catch bugs as soon as possible...
*/
void_type_init();
return NULL;
}
/*| global_var_name location */
// SYM_REF2(global_var_spec_c, global_var_name, location)
void *visit(global_var_spec_c *symbol) {
TRACE("global_var_spec_c");
/* now to produce the c equivalent... */
switch(wanted_varformat) {
case local_vf:
s4o.print(s4o.indent_spaces);
if (symbol->global_var_name != NULL) {
s4o.print("extern ");
this->current_var_type_symbol->accept(*this);
s4o.print("* ");
symbol->location->accept(*this);
s4o.print(";\n");
this->current_var_type_symbol->accept(*this);
s4o.print(" *");
if (this->resource_name != NULL) {
this->resource_name->accept(*this);
s4o.print("__");
}
symbol->global_var_name->accept(*this);
s4o.print(";\n");
if (this->resource_name != NULL) {
s4o.print("#define ");
symbol->global_var_name->accept(*this);
s4o.print(" ");
this->resource_name->accept(*this);
s4o.print("__");
symbol->global_var_name->accept(*this);
s4o.print("\n");
}
}
break;
case constructorinit_vf:
s4o.print(nv->get());
if (symbol->global_var_name != NULL) {
symbol->global_var_name->accept(*this);
s4o.print(" = ");
symbol->location->accept(*this);
s4o.print(";");
s4o.print(nv->get());
s4o.print("*");
symbol->global_var_name->accept(*this);
}
else
symbol->location->accept(*this);
s4o.print(" = ");
if (this->current_var_init_symbol != NULL) {
this->current_var_init_symbol->accept(*this);
}
s4o.print(";");
break;
default:
ERROR;
} /* switch() */
return NULL;
}
/* AT direct_variable */
// SYM_REF2(location_c, direct_variable, unused)
void *visit(location_c *symbol) {
TRACE("location_c");
return symbol->direct_variable->accept(*this);
}
/*| global_var_list ',' global_var_name */
//SYM_LIST(global_var_list_c)
void *visit(global_var_list_c *symbol) {
TRACE("global_var_list_c");
list_c *list = dynamic_cast<list_c *>(symbol);
/* should NEVER EVER occur!! */
if (list == NULL) ERROR;
/* now to produce the c equivalent... */
switch (wanted_varformat) {
case local_vf:
case localinit_vf:
for(int i = 0; i < list->n; i++) {
s4o.print(s4o.indent_spaces);
this->current_var_type_symbol->accept(*this);
s4o.print(" ");
if(this->resource_name != NULL)
this->resource_name->accept(*this);
s4o.print("__");
list->elements[i]->accept(*this);
s4o.print(";\n");
if(this->resource_name != NULL)
s4o.print("static ");
this->current_var_type_symbol->accept(*this);
s4o.print(" *");
list->elements[i]->accept(*this);
s4o.print(" = &");
if(this->resource_name != NULL)
this->resource_name->accept(*this);
s4o.print("__");
list->elements[i]->accept(*this);
#if 0
if (wanted_varformat == localinit_vf) {
if (this->current_var_init_symbol != NULL) {
s4o.print(" = ");
this->current_var_init_symbol->accept(*this);
}
}
#endif
s4o.print(";\n");
}
break;
case constructorinit_vf:
if (this->current_var_init_symbol != NULL) {
for(int i = 0; i < list->n; i++) {
s4o.print(nv->get());
s4o.print("*");
list->elements[i]->accept(*this);
s4o.print(" = ");
this->current_var_init_symbol->accept(*this);
s4o.print(";");
#if 0
/* The following code would be for globalinit_vf !!
* But it is not currently required...
*/
s4o.print(s4o.indent_spaces + "__ext_element_c<");
this->current_var_type_symbol->accept(*this);
s4o.print("> ");
if (this->globalnamespace != NULL) {
this->globalnamespace->accept(*this);
s4o.print("::");
}
list->elements[i]->accept(*this);
if (this->current_var_init_symbol != NULL) {
s4o.print(" = ");
s4o.print("__ext_element_c<");
this->current_var_type_symbol->accept(*this);
s4o.print(">(");
this->current_var_init_symbol->accept(*this);
s4o.print(")");
}
s4o.print(";\n");
#endif
}
}
break;
default:
ERROR; /* not supported, and not needed either... */
}
return NULL;
}
#if 0
/* var1_list ':' single_byte_string_spec */
SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec)
/* STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */
/* integer ->may be NULL ! */
/* single_byte_character_string ->may be NULL ! */
SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string)
/* var1_list ':' double_byte_string_spec */
SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec)
/* WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */
/* integer ->may be NULL ! */
/* double_byte_character_string ->may be NULL ! */
SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string)
/*| VAR [RETAIN|NON_RETAIN] incompl_located_var_decl_list END_VAR */
/* option ->may be NULL ! */
SYM_REF2(incompl_located_var_declarations_c, option, incompl_located_var_decl_list)
/* helper symbol for incompl_located_var_declarations */
/*| incompl_located_var_decl_list incompl_located_var_decl ';' */
SYM_LIST(incompl_located_var_decl_list_c)
/* variable_name incompl_location ':' var_spec */
SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused)
/* AT incompl_location_token */
SYM_TOKEN(incompl_location_c)
#endif
void *visit(falling_edge_option_c *symbol) {
// TO DO ...
s4o.print("F_EDGE");
return NULL;
}
void *visit(var1_init_decl_c *symbol) {
TRACE("var1_init_decl_c");
/* We have several implementation alternatives here...
*
* The issue is that generation of c code
* based on the abstract syntax tree requires the reversal
* of the symbol order compared to st. For e.g.:
* (ST) a, b, c: INT := 98;
* (C ) int a=98, b=98, c=98;
* The spec_init contains the references to 'INT' and '98'.
* The var1_list contains the references to 'a', 'b', and 'c'.
* The var1_init_decl_c contains the references to spec_init and var1_list.
*
* For c code generation, the var1_init_decl_c visitor
* would need to access the internals of other classes
* (e.g. the simple_spec_init_c).
*
* We can do this using one of three methods:
* 1) Create the abstract syntax tree differently;
* 2) Access other classes from within the var1_init_decl_c;
* 3) Pass info between the visitors using global variables
* only acessible by this class (private vars)
*
* In 1), the abstract syntax tree would be built so that
* var1_init_decl_c would contain direct references to
* var1_list_c, to the var type 'INT' and to the initialiser '98'
* (as per the example above).
*
* 2) would have several sub-options to obtain the references
* to 'INT' and '98' from within var1_init_decl_c.
* In 2a), the var1_init_decl_c would use dynamic casts to determine
* the class of spec_init (simple_spec_init_c, subrange_spec_init_c or
* enumerated_spec_init_c), and from there obtain the 'INT' and '98'
* In 2b) var1_init_decl_c would have one reference for each
* simple_spec_init_c, subrange_spec_init_c and enumerated_spec_init_c,
* the apropriate one being initialised by the var1_init_decl_c constructor.
* Note that the constructor would use dynamic casts. In essence, we
* would merely be changing the location of the code with the
* dynamic casts.
* In 2c) we would use three overloaded constructors for var1_init_decl_c
* one each for simple_spec_init_c, etc... This implies
* use type specific pointers to each symbol in the bison
* parser, instead of simply using a symbol_c * for all symbols;
*
* In 3), we use two global but private variables with references to
* 'INT' and '98', that would be initiliased by the visitors to
* simple_spec_init_c, subrange_spec_init_c and enumerated_spec_init_c.
* The visitor to var1_list_c would then use the references in the global
* variables.
*
* I (Mario) have chosen to use 3).
*/
/* Start off by setting the current_var_type_symbol and
* current_var_init_symbol private variables...
*/
update_type_init(symbol->spec_init);
/* now to produce the c equivalent... */
symbol->var1_list->accept(*this);
/* Values no longer in scope, and therefore no longer used.
* Make an effort to keep them set to NULL when not in use
* in order to catch bugs as soon as possible...
*/
void_type_init();
return NULL;
}
void *visit(var1_list_c *symbol) {
TRACE("var1_list_c");
declare_variables(symbol);
return NULL;
}
/* intermediate helper symbol for:
* - non_retentive_var_decls
* - output_declarations
*/
void *visit(var_init_decl_list_c *symbol) {
TRACE("var_init_decl_list_c");
return print_list(symbol);
return NULL;
}
/**************************************/
/* B.1.5 - Program organization units */
/**************************************/
/***********************/
/* B 1.5.1 - Functions */
/***********************/
/* The missing function_declaration_c
* is handled in derived classes
*/
/* intermediate helper symbol for function_declaration */
void *visit(var_declarations_list_c *symbol) {
TRACE("var_declarations_list_c");
return print_list(symbol);
}
void *visit(function_var_decls_c *symbol) {
TRACE("function_var_decls_c");
if ((wanted_vartype & private_vt) != 0) {
/*
// TO DO ...
if (symbol->option != NULL)
symbol->option->accept(*this);
*/
current_vartype = private_vt;
symbol->decl_list->accept(*this);
current_vartype = none_vt;
}
return NULL;
}
/* intermediate helper symbol for function_var_decls */
void *visit(var2_init_decl_list_c *symbol) {
TRACE("var2_init_decl_list_c");
print_list(symbol);
return NULL;
}
/*****************************/
/* B 1.5.2 - Function Blocks */
/*****************************/
/* The missing function_block_declaration_c
* is handled in derived classes
*/
/* VAR_TEMP temp_var_decl_list END_VAR */
void *visit(temp_var_decls_c *symbol) {
TRACE("temp_var_decls_c");
if ((wanted_vartype & temp_vt) != 0) {
current_vartype = temp_vt;
symbol->var_decl_list->accept(*this);
current_vartype = none_vt;
}
return NULL;
}
/* intermediate helper symbol for temp_var_decls */
void *visit(temp_var_decls_list_c *symbol) {
TRACE("temp_var_decls_list_c");
return print_list(symbol);
}
/* VAR NON_RETAIN var_init_decl_list END_VAR */
void *visit(non_retentive_var_decls_c *symbol) {
TRACE("non_retentive_var_decls_c");
// TODO ... guarantee the non-retain semantics!
if ((wanted_vartype & private_vt) != 0) {
current_vartype = private_vt;
symbol->var_decl_list->accept(*this);
current_vartype = none_vt;
}
return NULL;
}
/**********************/
/* B 1.5.3 - Programs */
/**********************/
/* leave for derived classes... */
/*********************************************/
/* B.1.6 Sequential function chart elements */
/*********************************************/
/********************************/
/* B 1.7 Configuration elements */
/********************************/
/* Programs instantiated inside configurations are declared as variables!! */
/*
CONFIGURATION configuration_name
optional_global_var_declarations
(resource_declaration_list | single_resource_declaration)
optional_access_declarations
optional_instance_specific_initializations
END_CONFIGURATION
*/
/*
SYM_REF6(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, unused)
*/
void *visit(configuration_declaration_c *symbol) {
TRACE("configuration_declaration_c");
if(symbol->global_var_declarations)
symbol->global_var_declarations->accept(*this); // will contain VAR_GLOBAL declarations!!
symbol->resource_declarations->accept(*this); // will contain PROGRAM declarations!!
return NULL;
}
/* helper symbol for configuration_declaration */
// SYM_LIST(resource_declaration_list_c)
void *visit(resource_declaration_list_c *symbol) {
TRACE("resource_declaration_list_c");
return print_list(symbol);
}
/*
RESOURCE resource_name ON resource_type_name
optional_global_var_declarations
single_resource_declaration
END_RESOURCE
*/
// SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration)
void *visit(resource_declaration_c *symbol) {
TRACE("resource_declaration_c");
//// Not used anymore. Even resource list are processed as single resource
// if ((wanted_vartype & resource_vt) != 0) {
// s4o.print(s4o.indent_spaces + "struct {\n");
// s4o.indent_right();
//
// current_vartype = resource_vt;
// if (NULL != symbol->global_var_declarations)
// symbol->global_var_declarations->accept(*this); // will contain VAR_GLOBAL declarations!!
// if (NULL != symbol->resource_declaration)
// symbol->resource_declaration->accept(*this); // will contain PROGRAM declarations!!
// current_vartype = none_vt;
//
// s4o.indent_left();
// s4o.print(s4o.indent_spaces + "} ");
// symbol->resource_name->accept(*this);
// s4o.print(";\n");
// }
return NULL;
}
/* task_configuration_list program_configuration_list */
// SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)
void *visit(single_resource_declaration_c *symbol) {
TRACE("single_resource_declaration_c");
if ((wanted_vartype & program_vt) != 0) {
unsigned int previous_vartype = current_vartype;
// previous_vartype will be resource_vt
current_vartype = program_vt;
symbol->program_configuration_list->accept(*this);
current_vartype = previous_vartype;
}
return NULL;
}
/* helper symbol for single_resource_declaration */
// SYM_LIST(task_configuration_list_c)
/* helper symbol for single_resource_declaration */
/* | program_configuration_list program_configuration ';' */
// SYM_LIST(program_configuration_list_c)
void *visit(program_configuration_list_c *symbol) {
TRACE("program_configuration_list_c");
return print_list(symbol);
}
/* helper symbol for
* - access_path
* - instance_specific_init
*/
// SYM_LIST(any_fb_name_list_c)
/* [resource_name '.'] global_var_name ['.' structure_element_name] */
// SYM_REF4(global_var_reference_c, resource_name, global_var_name, structure_element_name, unused)
/* prev_declared_program_name '.' symbolic_variable */
// SYM_REF2(program_output_reference_c, program_name, symbolic_variable)
/* TASK task_name task_initialization */
// SYM_REF2(task_configuration_c, task_name, task_initialization)
/* '(' [SINGLE ASSIGN data_source ','] [INTERVAL ASSIGN data_source ','] PRIORITY ASSIGN integer ')' */
// SYM_REF4(task_initialization_c, single_data_source, interval_data_source, priority_data_source, unused)
/* PROGRAM [RETAIN | NON_RETAIN] program_name [WITH task_name] ':' program_type_name ['(' prog_conf_elements ')'] */
// SYM_REF6(program_configuration_c, retain_option, program_name, task_name, program_type_name, prog_conf_elements, unused)
private:
/* a helper function to the program_configuration_c visitor... */
void program_constructor_call(program_configuration_c *symbol) {
program_declaration_c *p_decl = program_type_symtable.find_value(symbol->program_type_name);
if (p_decl == program_type_symtable.end_value())
/* should never occur. The program being called MUST be in the symtable... */
ERROR;
symbol->program_name->accept(*this);
s4o.print("(");
/* 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(p_decl);
function_call_param_iterator_c function_call_param_iterator(symbol);
identifier_c *param_name;
nv->push("", ", ");
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();
#if 0
/* Get the value from a foo(<param_name> = <param_value>) style call */
symbol_c *param_value = function_call_param_iterator.search(param_name);
#endif
switch (param_direction) {
case function_param_iterator_c::direction_in:
case function_param_iterator_c::direction_out:
case function_param_iterator_c::direction_inout:
/* ignore them all!! */
break;
case function_param_iterator_c::direction_extref:
#if 0
if (param_value == NULL)
/* This is illegal in ST and IL languages.
* All variables declared in a VAR_EXTERNAL __must__
* be initialised to reference a specific VAR_GLOBAL variable!!
*
* The semantic checker should have caught this, we check again just the
* same (especially since the semantic checker has not yet been written!).
*/
ERROR;
s4o.print(nv->get());
s4o.print("&");
param_value->accept(*this);
#endif
break;
#if 0
if (param_value == NULL) {
/* no parameter value given, so we pass a previously declared temporary variable. */
std::string *temp_var_name = temp_var_name_factory.new_name();
s4o.print(*temp_var_name);
delete temp_var_name;
} else {
param_value->accept(*this);
}
#endif
break;
} /* switch */
} /* for(...) */
// symbol->parameter_assignment->accept(*this);
s4o.print(")");
nv->pop();
return;
}
public:
void *visit(program_configuration_c *symbol) {
TRACE("program_configuration_c");
/* now to produce the c equivalent... */
switch (wanted_varformat) {
case local_vf:
case localinit_vf:
s4o.print(s4o.indent_spaces);
symbol->program_type_name->accept(*this);
s4o.print(" ");
symbol->program_name->accept(*this);
if (wanted_varformat == localinit_vf) {
// TODO...
// program_call(symbol);
}
s4o.print(";\n");
break;
case constructorinit_vf:
s4o.print(nv->get());
program_constructor_call(symbol);
/*
symbol->program_name->accept(*this);
s4o.print("(");
symbol->prog_conf_elements->accept(*this);
nv->pop();
s4o.print(")");
*/
break;
default:
ERROR; /* not supported, and not needed either... */
}
return NULL;
}
/* prog_conf_elements ',' prog_conf_element */
//SYM_LIST(prog_conf_elements_c)
void *visit(prog_conf_elements_c *symbol) {
TRACE("prog_conf_elements_c");
return print_list(symbol);
}
/* fb_name WITH task_name */
//SYM_REF2(fb_task_c, fb_name, task_name)
void *visit(fb_task_c *symbol) {
TRACE("fb_task_c");
/* TODO...
*
* NOTE: Not yet supported...
* We do not support allocating specific function blocks declared
* inside a program to be executed by a different task from the one
* already executing the program itself.
* This is mostly because I (Mario) simply do not understand the
* semantics the standard expects us to implement in this case. It is all
* very confusing, and very poorly defined in the standard!
*/
ERROR;
return NULL;
}
/* any_symbolic_variable ASSIGN prog_data_source */
// SYM_REF2(prog_cnxn_assign_c, symbolic_variable, prog_data_source)
void *visit(prog_cnxn_assign_c *symbol) {
TRACE("prog_cnxn_assign_c");
/* TODO... */
return NULL;
}
/* any_symbolic_variable SENDTO data_sink */
// SYM_REF2(prog_cnxn_sendto_c, symbolic_variable, prog_data_source)
void *visit(prog_cnxn_sendto_c *symbol) {
TRACE("prog_cnxn_sendto_c");
/* TODO... */
return NULL;
}
#if 0
/* VAR_CONFIG instance_specific_init_list END_VAR_BOGUS */
SYM_REF2(instance_specific_initializations_c, instance_specific_init_list, unused)
/* helper symbol for instance_specific_initializations */
SYM_LIST(instance_specific_init_list_c)
/* resource_name '.' program_name '.' {fb_name '.'}
((variable_name [location] ':' located_var_spec_init) | (fb_name ':' fb_initialization))
*/
SYM_REF6(instance_specific_init_c, resource_name, program_name, any_fb_name_list, variable_name, location, initialization)
/* helper symbol for instance_specific_init */
/* function_block_type_name ':=' structure_initialization */
SYM_REF2(fb_initialization_c, function_block_type_name, structure_initialization)
#endif
/****************************************/
/* B.2 - Language IL (Instruction List) */
/****************************************/
/***********************************/
/* B 2.1 Instructions and Operands */
/***********************************/
/* leave for derived classes... */
/*******************/
/* B 2.2 Operators */
/*******************/
/* leave for derived classes... */
/***************************************/
/* B.3 - Language ST (Structured Text) */
/***************************************/
/***********************/
/* B 3.1 - Expressions */
/***********************/
/* leave for derived classes... */
/********************/
/* B 3.2 Statements */
/********************/
/* leave for derived classes... */
/*********************************/
/* B 3.2.1 Assignment Statements */
/*********************************/
/* leave for derived classes... */
/*****************************************/
/* B 3.2.2 Subprogram Control Statements */
/*****************************************/
/* leave for derived classes... */
/********************************/
/* B 3.2.3 Selection Statements */
/********************************/
/* leave for derived classes... */
/********************************/
/* B 3.2.4 Iteration Statements */
/********************************/
/* leave for derived classes... */
}; /* generate_c_vardecl_c */