/*
* matiec - a compiler for the programming languages defined in IEC 61131-3
*
* Copyright (C) 2003-2012 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.
*/
#define INLINE_RESULT_TEMP_VAR "__res"
#define INLINE_PARAM_COUNT "__PARAM_COUNT"
class generate_c_inlinefcall_c: public generate_c_base_and_typeid_c {
public:
typedef enum {
expression_vg,
assignment_vg,
complextype_base_vg,
complextype_suffix_vg
} variablegeneration_t;
private:
/* The name of the IL default variable... */
#define IL_DEFVAR VAR_LEADER "IL_DEFVAR"
/* The name of the variable used to pass the result of a
* parenthesised instruction list to the immediately preceding
* scope ...
*/
#define IL_DEFVAR_BACK VAR_LEADER "IL_DEFVAR_BACK"
il_default_variable_c implicit_variable_current;
symbol_c* current_array_type;
int fcall_number;
bool generating_inlinefunction;
symbol_c *fbname;
search_varfb_instance_type_c *search_varfb_instance_type;
search_var_instance_decl_c *search_var_instance_decl;
variablegeneration_t wanted_variablegeneration;
public:
generate_c_inlinefcall_c(stage4out_c *s4o_ptr, symbol_c *name, symbol_c *scope, const char *variable_prefix = NULL)
: generate_c_base_and_typeid_c(s4o_ptr),
implicit_variable_current(IL_DEFVAR, NULL)
{
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);
fcall_number = 0;
fbname = name;
wanted_variablegeneration = expression_vg;
generating_inlinefunction = false;
}
virtual ~generate_c_inlinefcall_c(void) {
delete search_varfb_instance_type;
delete search_var_instance_decl;
}
void print(symbol_c* symbol) {
function_call_iterator_c fc_iterator(symbol);
symbol_c* function_call;
while ((function_call = fc_iterator.next()) != NULL) {
function_call->accept(*this);
}
}
void generate_inline(symbol_c *function_name,
symbol_c *function_type_prefix,
symbol_c *function_type_suffix,
std::list<FUNCTION_PARAM*> param_list,
function_declaration_c *f_decl = NULL) {
std::list<FUNCTION_PARAM*>::iterator pt;
generating_inlinefunction = true;
fcall_number++;
function_type_prefix = default_literal_type(function_type_prefix);
if (function_type_suffix) {
function_type_suffix = default_literal_type(function_type_suffix);
}
s4o.print(s4o.indent_spaces);
s4o.print("static inline ");
function_type_prefix->accept(*this);
s4o.print(" __");
fbname->accept(*this);
s4o.print("_");
function_name->accept(*this);
if (f_decl != NULL) {
/* function being called is overloaded! */
s4o.print("__");
print_function_parameter_data_types_c overloaded_func_suf(&s4o);
f_decl->accept(overloaded_func_suf);
}
if (function_type_suffix) {
function_type_suffix->accept(*this);
}
s4o.print(fcall_number);
s4o.print("(");
s4o.indent_right();
PARAM_LIST_ITERATOR() {
if (PARAM_DIRECTION == function_param_iterator_c::direction_in) {
default_literal_type(PARAM_TYPE)->accept(*this);
s4o.print(" ");
PARAM_NAME->accept(*this);
s4o.print(",\n" + s4o.indent_spaces);
}
}
fbname->accept(*this);
s4o.print(" *");
s4o.print(FB_FUNCTION_PARAM);
s4o.indent_left();
s4o.print(")\n" + s4o.indent_spaces);
s4o.print("{\n");
s4o.indent_right();
s4o.print(s4o.indent_spaces);
function_type_prefix->accept(*this);
s4o.print(" "),
s4o.print(INLINE_RESULT_TEMP_VAR);
s4o.print(";\n");
PARAM_LIST_ITERATOR() {
if ((PARAM_DIRECTION == function_param_iterator_c::direction_out ||
PARAM_DIRECTION == function_param_iterator_c::direction_inout) &&
PARAM_VALUE != NULL) {
s4o.print(s4o.indent_spaces);
PARAM_TYPE->accept(*this);
s4o.print(" ");
s4o.print(TEMP_VAR);
PARAM_NAME->accept(*this);
s4o.print(" = ");
print_check_function(PARAM_TYPE, PARAM_VALUE);
s4o.print(";\n");
}
}
s4o.print(s4o.indent_spaces + INLINE_RESULT_TEMP_VAR),
s4o.print(" = ");
function_name->accept(*this);
if (f_decl != NULL) {
/* function being called is overloaded! */
s4o.print("__");
print_function_parameter_data_types_c overloaded_func_suf(&s4o);
f_decl->accept(overloaded_func_suf);
}
if (function_type_suffix)
function_type_suffix->accept(*this);
s4o.print("(");
s4o.indent_right();
PARAM_LIST_ITERATOR() {
if (pt != param_list.begin())
s4o.print(",\n" + s4o.indent_spaces);
if (PARAM_DIRECTION == function_param_iterator_c::direction_in)
PARAM_NAME->accept(*this);
else if (PARAM_VALUE != NULL){
s4o.print("&");
s4o.print(TEMP_VAR);
PARAM_NAME->accept(*this);
} else {
s4o.print("NULL");
}
}
s4o.print(");\n");
s4o.indent_left();
PARAM_LIST_ITERATOR() {
if ((PARAM_DIRECTION == function_param_iterator_c::direction_out ||
PARAM_DIRECTION == function_param_iterator_c::direction_inout) &&
PARAM_VALUE != NULL) {
s4o.print(s4o.indent_spaces);
print_setter(PARAM_VALUE, PARAM_TYPE, PARAM_NAME);
s4o.print(";\n");
}
}
s4o.print(s4o.indent_spaces + "return ");
s4o.print(INLINE_RESULT_TEMP_VAR);
s4o.print(";\n");
s4o.indent_left();
s4o.print(s4o.indent_spaces + "}\n\n");
generating_inlinefunction = false;
}
private:
/* a small helper function */
symbol_c *default_literal_type(symbol_c *symbol) {
if (get_datatype_info_c::is_ANY_INT_literal(symbol)) {
return &get_datatype_info_c::lint_type_name;
}
else if (get_datatype_info_c::is_ANY_REAL_literal(symbol)) {
return &get_datatype_info_c::lreal_type_name;
}
return symbol;
}
void *print_getter(symbol_c *symbol) {
unsigned int vartype = search_var_instance_decl->get_vartype(symbol);
if (vartype == search_var_instance_decl_c::external_vt) {
if (!get_datatype_info_c::is_type_valid (symbol->datatype)) ERROR;
if ( get_datatype_info_c::is_function_block(symbol->datatype))
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("(");
wanted_variablegeneration = complextype_base_vg;
symbol->accept(*this);
s4o.print(",");
wanted_variablegeneration = complextype_suffix_vg;
symbol->accept(*this);
s4o.print(")");
wanted_variablegeneration = expression_vg;
return NULL;
}
void *print_setter(symbol_c* symbol,
symbol_c* type,
symbol_c* value) {
unsigned int vartype = search_var_instance_decl->get_vartype(symbol);
if (vartype == search_var_instance_decl_c::external_vt) {
if (!get_datatype_info_c::is_type_valid (symbol->datatype)) ERROR;
if ( get_datatype_info_c::is_function_block(symbol->datatype))
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);
s4o.print("(,");
wanted_variablegeneration = complextype_base_vg;
symbol->accept(*this);
s4o.print(",");
if (analyse_variable_c::contains_complex_type(symbol)) {
wanted_variablegeneration = complextype_suffix_vg;
symbol->accept(*this);
}
s4o.print(",");
wanted_variablegeneration = expression_vg;
print_check_function(type, value, NULL, true);
s4o.print(")");
wanted_variablegeneration = expression_vg;
return NULL;
}
/********************/
/* 2.1.6 - Pragmas */
/********************/
//SYM_REF0(disable_code_generation_pragma_c)
//SYM_REF0(enable_code_generation_pragma_c)
//SYM_TOKEN(pragma_c)
void *visit(pragma_c *symbol) {return NULL;}
/*************************/
/* B.1 - Common elements */
/*************************/
/*******************************************/
/* B 1.1 - Letters, digits and identifiers */
/*******************************************/
void *visit(identifier_c *symbol) {
if (generating_inlinefunction) {
return generate_c_base_c::visit(symbol); // let the base class handle it...
}
return NULL;
}
/*********************/
/* B 1.4 - Variables */
/*********************/
void *visit(symbolic_variable_c *symbol) {
unsigned int vartype;
if (generating_inlinefunction) {
if (wanted_variablegeneration == complextype_base_vg)
generate_c_base_c::visit(symbol);
else if (wanted_variablegeneration == complextype_suffix_vg)
return NULL;
else
print_getter(symbol);
}
return NULL;
}
/********************************************/
/* B.1.4.1 Directly Represented Variables */
/********************************************/
// direct_variable: direct_variable_token {$$ = new direct_variable_c($1);};
void *visit(direct_variable_c *symbol) {
TRACE("direct_variable_c");
if (generating_inlinefunction) {
/* Do not use print_token() as it will change everything into uppercase */
if (strlen(symbol->value) == 0) ERROR;
s4o.print(GET_LOCATED);
s4o.print("(");
this->print_variable_prefix();
s4o.printlocation(symbol->value + 1);
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 = analyse_variable_c::is_complex_type(symbol->record_variable);
if (generating_inlinefunction) {
switch (wanted_variablegeneration) {
case complextype_base_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;
default:
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) {
if (generating_inlinefunction) {
switch (wanted_variablegeneration) {
case complextype_base_vg:
symbol->subscripted_variable->accept(*this);
break;
case complextype_suffix_vg:
symbol->subscripted_variable->accept(*this);
current_array_type = search_varfb_instance_type->get_type_id(symbol->subscripted_variable);
if (current_array_type == NULL) ERROR;
s4o.print(".table");
symbol->subscript_list->accept(*this);
current_array_type = NULL;
break;
default:
print_getter(symbol);
break;
}
}
return NULL;
}
/****************************************/
/* B.2 - Language IL (Instruction List) */
/****************************************/
/***********************************/
/* B 2.1 Instructions and Operands */
/***********************************/
/* | label ':' [il_incomplete_instruction] eol_list */
// SYM_REF2(il_instruction_c, label, il_instruction)
void *visit(il_instruction_c *symbol) {
/* all previous IL instructions should have the same datatype (checked in stage3), so we get the datatype from the first previous IL instruction we find */
implicit_variable_current.datatype = (symbol->prev_il_instruction.empty())? NULL : symbol->prev_il_instruction[0]->datatype;
if (NULL != symbol->il_instruction) symbol->il_instruction->accept(*this);
implicit_variable_current.datatype = NULL;
return NULL;
}
/* | il_simple_operator [il_operand] */
//SYM_REF2(il_simple_operation_c, il_simple_operator, il_operand)
void *visit(il_simple_operation_c *symbol) {
symbol->il_simple_operator->accept(*this);
return NULL;
}
/* il_jump_operator label */
// SYM_REF2(il_jump_operation_c, il_jump_operator, label)
void *visit(il_jump_operation_c *symbol) {
return NULL;
}
void *visit(il_function_call_c *symbol) {
symbol_c* function_type_prefix = NULL;
symbol_c* function_name = NULL;
symbol_c* function_type_suffix = NULL;
DECLARE_PARAM_LIST()
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;
/* determine the base data type returned by the function being called... */
function_type_prefix = search_base_type_c::get_basetype_decl(f_decl->type_name);
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 remember whether we have already used the value stored in the default variable to pass to the first parameter */
bool used_defvar = false;
/* 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(INLINE_PARAM_COUNT);
ADD_PARAM_LIST(param_name, param_value, param_type, function_param_iterator_c::direction_in)
found_first_extensible_parameter = true;
}
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 */
/* NOTE: the following line of code is not required in this case, but it doesn't
* harm to leave it in, as in the case of a non-formal syntax function call,
* it will always return NULL.
* We leave it in in case we later decide to merge this part of the code together
* with the function calling code in generate_c_st_c, which does require
* the following line...
*/
if (param_value == NULL)
param_value = function_call_param_iterator.search_f(param_name);
/* if it is the first parameter in a non-formal function call (which is the
* case being handled!), semantics specifies that we should
* get the value off the IL default variable!
*
* However, if the parameter is an implicitly defined EN or ENO parameter, we should not
* use the default variable as a source of data to pass to those parameters!
*/
if ((param_value == NULL) && (!used_defvar) && !fp_iterator.is_en_eno_param_implicit()) {
if (NULL == implicit_variable_current.datatype) ERROR;
param_value = &this->implicit_variable_current;
used_defvar = true;
}
/* 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;
}
/* We do not yet support embedded IL lists, so we abort the compiler if we find one */
/* Note that in IL function calls the syntax does not allow embeded IL lists, so this check is not necessary here! */
/*
{simple_instr_list_c *instruction_list = dynamic_cast<simple_instr_list_c *>(param_value);
if (NULL != instruction_list) STAGE4_ERROR(param_value, param_value, "The compiler does not yet support formal invocations in IL that contain embedded IL lists. Aborting!");
}
*/
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, fp_iterator.param_direction())
} /* for(...) */
if (function_call_param_iterator.next_nf() != NULL) ERROR;
if (NULL == function_type_prefix) ERROR;
bool has_output_params = false;
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 (fdecl_mutiplicity == 1)
/* function being called is NOT overloaded! */
f_decl = NULL;
if (has_output_params)
generate_inline(function_name, function_type_prefix, function_type_suffix, param_list, f_decl);
CLEAR_PARAM_LIST()
return NULL;
}
/* | il_expr_operator '(' [il_operand] eol_list [simple_instr_list] ')' */
//SYM_REF4(il_expression_c, il_expr_operator, il_operand, simple_instr_list, unused)
void *visit(il_expression_c *symbol) {
/* We will be recursevely interpreting an instruction list, so we store a backup of the implicit_variable_result/current.
* Notice that they will be overwriten while processing the parenthsized instruction list.
*/
// il_default_variable_c old_implicit_variable_current = this->implicit_variable_current; // no longer needed as we do not call symbol->il_expr_operator->accept(*this);
/* Stage2 will insert an artificial (and equivalent) LD <il_operand> to the simple_instr_list if necessary. We can therefore ignore the 'il_operand' entry! */
//if (NULL != symbol->il_operand) { do nothing!! }
/* Now do the parenthesised instructions... */
/* NOTE: the following code line will get the variable this->implicit_variable_current.datatype updated! */
symbol->simple_instr_list->accept(*this);
/* Now do the operation, using the previous result! */
/* NOTE: Actually, we do not need to call this, as it can never be a function call, which is what we are handling here... */
// this->implicit_variable_current.datatype = old_current_default_variable_data_type;
// symbol->il_expr_operator->accept(*this);
return NULL;
}
/* | function_name '(' eol_list [il_param_list] ')' */
// SYM_REF2(il_formal_funct_call_c, function_name, il_param_list)
void *visit(il_formal_funct_call_c *symbol) {
symbol_c* function_type_prefix = NULL;
symbol_c* function_name = NULL;
symbol_c* function_type_suffix = NULL;
DECLARE_PARAM_LIST()
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;
/* determine the base data type returned by the function being called... */
function_type_prefix = search_base_type_c::get_basetype_decl(f_decl->type_name);
if (NULL == function_type_prefix) 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(INLINE_PARAM_COUNT);
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 */
/* NOTE: the following line of code is not required in this case, but it doesn't
* harm to leave it in, as in the case of a formal syntax function call,
* it will always return NULL.
* We leave it in in case we later decide to merge this part of the code together
* with the function calling code in generate_c_st_c, which does require
* the following line...
*/
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;
}
/* We do not yet support embedded IL lists, so we abort the compiler if we find one */
{simple_instr_list_c *instruction_list = dynamic_cast<simple_instr_list_c *>(param_value);
if (NULL != instruction_list) STAGE4_ERROR(param_value, param_value, "The compiler does not yet support formal invocations in IL that contain embedded IL lists. Aborting!");
}
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, fp_iterator.param_direction())
}
if (function_call_param_iterator.next_nf() != NULL) ERROR;
bool has_output_params = false;
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 (fdecl_mutiplicity == 1)
/* function being called is NOT overloaded! */
f_decl = NULL;
if (has_output_params)
generate_inline(function_name, function_type_prefix, function_type_suffix, param_list, f_decl);
CLEAR_PARAM_LIST()
return NULL;
}
/* | simple_instr_list il_simple_instruction */
// SYM_LIST(simple_instr_list_c)
void *visit(simple_instr_list_c *symbol) {return iterator_visitor_c::visit(symbol);}
// SYM_REF1(il_simple_instruction_c, il_simple_instruction, symbol_c *prev_il_instruction;)
void *visit(il_simple_instruction_c *symbol) {
/* all previous IL instructions should have the same datatype (checked in stage3), so we get the datatype from the first previous IL instruction we find */
implicit_variable_current.datatype = (symbol->prev_il_instruction.empty())? NULL : symbol->prev_il_instruction[0]->datatype;
symbol->il_simple_instruction->accept(*this);
implicit_variable_current.datatype = NULL;
return NULL;
}
/***************************************/
/* B.3 - Language ST (Structured Text) */
/***************************************/
/***********************/
/* B 3.1 - Expressions */
/***********************/
void *visit(statement_list_c *symbol) {
function_call_iterator_c fc_iterator(symbol);
symbol_c* function_call;
while ((function_call = fc_iterator.next()) != NULL) {
function_call->accept(*this);
}
return NULL;
}
void *visit(function_invocation_c *symbol) {
symbol_c* function_type_prefix = NULL;
symbol_c* function_name = NULL;
symbol_c* function_type_suffix = NULL;
DECLARE_PARAM_LIST()
symbol_c *parameter_assignment_list = NULL;
if (NULL != symbol-> formal_param_list) parameter_assignment_list = symbol-> formal_param_list;
if (NULL != symbol->nonformal_param_list) parameter_assignment_list = symbol->nonformal_param_list;
// NOTE-> We support the non-standard feature of POUS with no in, out and inout parameters, so this is no longer an internal error!
// 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;
/* determine the base data type returned by the function being called... */
function_type_prefix = search_base_type_c::get_basetype_decl(f_decl->type_name);
if (NULL == function_type_prefix) ERROR;
/* 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(INLINE_PARAM_COUNT);
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;
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 (fdecl_mutiplicity == 1)
/* function being called is NOT overloaded! */
f_decl = NULL;
if (has_output_params)
generate_inline(function_name, function_type_prefix, function_type_suffix, param_list, f_decl);
CLEAR_PARAM_LIST()
return NULL;
}
/*********************************************/
/* B.1.6 Sequential function chart elements */
/*********************************************/
void *visit(initial_step_c *symbol) {
return NULL;
}
void *visit(step_c *symbol) {
return NULL;
}
void *visit(transition_c *symbol) {
return symbol->transition_condition->accept(*this);
}
void *visit(transition_condition_c *symbol) {
// Transition condition is in IL
if (symbol->transition_condition_il != NULL) {
symbol->transition_condition_il->accept(*this);
}
// Transition condition is in ST
if (symbol->transition_condition_st != NULL) {
function_call_iterator_c fc_iterator(symbol->transition_condition_st);
symbol_c* function_call;
while ((function_call = fc_iterator.next()) != NULL) {
function_call->accept(*this);
}
}
return NULL;
}
void *visit(action_c *symbol) {
return symbol->function_block_body->accept(*this);
}
}; /* generate_c_inlinefcall_c */