Bug with using non explicit literals as standard library functions input parameters fixed
/*
* (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 il statements (i.e. IL code).
*
* This is part of the 4th stage that generates
* a c++ source program equivalent to the IL and ST
* code.
*/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/* Returns the data type of an il_operand.
*
* Note that the il_operand may be a variable, in which case
* we return the type of the variable instance.
* The il_operand may also be a constant, in which case
* we return the data type of that constant.
*
* The variable instance may be a member of a structured variable,
* or an element in an array, or any combination of the two.
*
* The class constructor must be given the search scope
* (function, function block or program within which
* the possible il_operand variable instance was declared).
*/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/* A new class to ouput the il default variable to c++ code
* We use this class, inheriting from symbol_c, so it may be used
* as any other symbol_c object in the intermediate parse tree,
* more specifically, so it can be used as any other il operand.
* This makes the rest of the code much easier...
*
* Nevertheless, the basic visitor class visitor_c does not know
* how to visit this new il_default_variable_c class, so we have
* to extend that too.
* In reality extending the basic symbols doesn't quite work out
* as cleanly as desired (we need to use dynamic_cast in the
* accept method of the il_default_variable_c), but it is cleaner
* than the alternative...
*/
class il_default_variable_c;
/* This visitor class is not really required, we could place the
* visit() method directly in genertae_cc_il_c, but doing it in
* a seperate class makes the architecture more evident...
*/
class il_default_variable_visitor_c {
public:
virtual void *visit(il_default_variable_c *symbol) = 0;
virtual ~il_default_variable_visitor_c(void) {return;}
};
/* A class to print out to the resulting C++ code
* the IL default variable name.
*
* It includes a reference to its name,
* and the data type of the data currently stored
* in this C++ variable... This is required because the
* C++ variable is a union, and we must know which member
* of the union top reference!!
*
* Note that we also need to keep track of the data type of
* the value currently being stored in the default variable.
* This is required so we can process parenthesis,
*
* e.g. :
* LD var1
* AND (
* LD var2
* OR var3
* )
*
* Note that we only execute the 'AND (' operation when we come across
* the ')', i.e. once we have evaluated the result of the
* instructions inside the parenthesis.
* When we do execute the 'AND (' operation, we need to know the data type
* of the operand, which in this case is the result of the evaluation of the
* instruction list inside the parenthesis. We can only know this if we
* keep track of the data type currently stored in the default variable!
*
* We use the current_type inside the generate_c_il::default_variable_name variable
* to track this!
*/
class il_default_variable_c: public symbol_c {
public:
symbol_c *var_name; /* in principle, this should point to an indentifier_c */
symbol_c *current_type;
public:
il_default_variable_c(const char *var_name_str, symbol_c *current_type);
virtual void *accept(visitor_c &visitor);
};
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
class generate_c_il_c: public generate_c_typedecl_c, il_default_variable_visitor_c {
private:
/* When compiling il code, it becomes necessary to determine the
* data type of il operands. To do this, we must first find the
* il operand's declaration, within the scope of the function block
* or function currently being processed.
* The following object does just that...
* This object instance will then later be called while the
* remaining il code is being handled.
*/
search_expression_type_c *search_expression_type;
/* The initial value that should be given to the IL default variable
* imediately after a parenthesis is opened.
* This variable is only used to pass data from the
* il_expression_c visitor to the simple_instr_list_c visitor.
*
* e.g.:
* LD var1
* AND ( var2
* OR var3
* )
*
* In the above code sample, the line 'AND ( var2' constitutes
* an il_expression_c, where var2 should be loaded into the
* il default variable before continuing with the expression
* inside the parenthesis.
* Unfortunately, only the simple_instr_list_c may do the
* initial laoding of the var2 bariable following the parenthesis,
* so the il_expression_c visitor will have to pass 'var2' as a
* parameter to the simple_instr_list_c visitor.
* Ergo, the existance of the following parameter...!
*/
symbol_c *il_default_variable_init_value;
/* Operand to the IL operation currently being processed... */
/* These variables are used to pass data from the
* il_simple_operation_c and il_expression_c visitors
* to the il operator visitors (i.e. LD_operator_c,
* LDN_operator_c, ST_operator_c, STN_operator_c, ...)
*/
symbol_c *current_operand;
symbol_c *current_operand_type;
/* Label to which the current IL jump operation should jump to... */
/* This variable is used to pass data from the
* il_jump_operation_c visitor
* to the il jump operator visitors (i.e. JMP_operator_c,
* JMPC_operator_c, JMPCN_operator_c, ...)
*/
symbol_c *jump_label;
/* The result of the comparison IL operations (GT, EQ, LT, ...)
* is a boolean variable.
* This class keeps track of the current data type stored in the
* il default variable. This is usually done by keeping a reference
* to the data type of the last operand. Nevertheless, in the case of
* the comparison IL operators, the data type of the result (a boolean)
* is not the data type of the operand. We therefore need an object
* of the boolean data type to keep as a reference of the current
* data type.
* The following object is it...
*/
bool_type_name_c bool_type;
lint_type_name_c lint_type;
lword_type_name_c lword_type;
lreal_type_name_c lreal_type;
/* the data type of the IL default variable... */
#define IL_DEFVAR_T VAR_LEADER "IL_DEFVAR_T"
/* 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 default_variable_name;
il_default_variable_c default_variable_back_name;
/* 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_base_type_c search_base_type;
bool current_param_is_pointer;
public:
generate_c_il_c(stage4out_c *s4o_ptr, symbol_c *scope, const char *variable_prefix = NULL)
: generate_c_typedecl_c(s4o_ptr),
default_variable_name(IL_DEFVAR, NULL),
default_variable_back_name(IL_DEFVAR_BACK, NULL)
{
search_expression_type = new search_expression_type_c(scope);
search_fb_instance_decl = new search_fb_instance_decl_c(scope);
search_varfb_instance_type = new search_varfb_instance_type_c(scope);
current_operand = NULL;
current_operand_type = NULL;
il_default_variable_init_value = NULL;
current_param_is_pointer = false;
this->set_variable_prefix(variable_prefix);
}
virtual ~generate_c_il_c(void) {
delete search_fb_instance_decl;
delete search_expression_type;
delete search_varfb_instance_type;
}
void generate(instruction_list_c *il) {
il->accept(*this);
}
/* Declare the backup to the default variable, that will store the result
* of the IL operations executed inside a parenthesis...
*/
void declare_backup_variable(void) {
s4o.print(s4o.indent_spaces);
s4o.print(IL_DEFVAR_T);
s4o.print(" ");
print_backup_variable();
s4o.print(";\n");
}
void print_backup_variable(void) {
this->default_variable_back_name.accept(*this);
}
private:
/* A helper function... */
/*
bool is_bool_type(symbol_c *type_symbol) {
return (NULL != dynamic_cast<bool_type_name_c *>(type_symbol));
}
*/
/* A helper function... */
void *XXX_operator(symbol_c *lo, const char *op, symbol_c *ro) {
if ((NULL == lo) || (NULL == ro)) ERROR;
if (NULL == op) ERROR;
lo->accept(*this);
s4o.print(op);
ro->accept(*this);
return NULL;
}
/* A helper function... */
void *XXX_function(const char *func, symbol_c *lo, symbol_c *ro) {
if ((NULL == lo) || (NULL == ro)) ERROR;
if (NULL == func) ERROR;
lo->accept(*this);
s4o.print(" = ");
s4o.print(func);
s4o.print("(");
lo->accept(*this);
s4o.print(", ");
ro->accept(*this);
s4o.print(")");
return NULL;
}
/* A helper function... */
void *XXX_CAL_operator(const char *param_name, symbol_c *fb_name) {
if (NULL == fb_name) ERROR;
symbolic_variable_c *sv = dynamic_cast<symbolic_variable_c *>(fb_name);
if (NULL == sv) ERROR;
identifier_c *id = dynamic_cast<identifier_c *>(sv->var_name);
if (NULL == id) ERROR;
identifier_c param(param_name);
//SYM_REF3(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list)
il_assign_operator_c il_assign_operator(¶m);
il_param_assignment_c il_param_assignment(&il_assign_operator, &this->default_variable_name, NULL);
// SYM_LIST(il_param_list_c)
il_param_list_c il_param_list;
il_param_list.add_element(&il_param_assignment);
CAL_operator_c CAL_operator;
// SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list)
il_fb_call_c il_fb_call(&CAL_operator, id, NULL, &il_param_list);
il_fb_call.accept(*this);
return NULL;
}
/* A helper function... */
void *CMP_operator(symbol_c *o, const char *operation) {
if (NULL == o) ERROR;
if (NULL == this->default_variable_name.current_type) ERROR;
symbol_c *backup = this->default_variable_name.current_type;
this->default_variable_name.current_type = &(this->bool_type);
this->default_variable_name.accept(*this);
this->default_variable_name.current_type = backup;
s4o.print(" = ");
s4o.print(operation);
this->default_variable_name.current_type->accept(*this);
s4o.print("(__BOOL_LITERAL(TRUE), NULL, 2, ");
this->default_variable_name.accept(*this);
s4o.print(", ");
o->accept(*this);
s4o.print(")");
/* the data type resulting from this operation... */
this->default_variable_name.current_type = &(this->bool_type);
return NULL;
}
/* A helper function... */
void C_modifier(void) {
if (search_expression_type->is_bool_type(default_variable_name.current_type)) {
s4o.print("if (");
this->default_variable_name.accept(*this);
s4o.print(") ");
}
else {ERROR;}
}
/* A helper function... */
void CN_modifier(void) {
if (search_expression_type->is_bool_type(default_variable_name.current_type)) {
s4o.print("if (!");
this->default_variable_name.accept(*this);
s4o.print(") ");
}
else {ERROR;}
}
void BYTE_operator_result_type(void) {
if (search_expression_type->is_literal_integer_type(this->default_variable_name.current_type)) {
if (search_expression_type->is_literal_integer_type(this->current_operand_type))
this->default_variable_name.current_type = &(this->lword_type);
else
this->default_variable_name.current_type = this->current_operand_type;
}
else if (search_expression_type->is_literal_integer_type(this->current_operand_type))
this->current_operand_type = this->default_variable_name.current_type;
}
void NUM_operator_result_type(void) {
if (search_expression_type->is_literal_real_type(this->default_variable_name.current_type)) {
if (search_expression_type->is_literal_integer_type(this->current_operand_type) ||
search_expression_type->is_literal_real_type(this->current_operand_type))
this->default_variable_name.current_type = &(this->lreal_type);
else
this->default_variable_name.current_type = this->current_operand_type;
}
else if (search_expression_type->is_literal_integer_type(this->default_variable_name.current_type)) {
if (search_expression_type->is_literal_integer_type(this->current_operand_type))
this->default_variable_name.current_type = &(this->lint_type);
else if (search_expression_type->is_literal_real_type(this->current_operand_type))
this->default_variable_name.current_type = &(this->lreal_type);
else
this->default_variable_name.current_type = this->current_operand_type;
}
else if (search_expression_type->is_literal_integer_type(this->current_operand_type) ||
search_expression_type->is_literal_real_type(this->current_operand_type))
this->current_operand_type = this->default_variable_name.current_type;
}
public:
void *visit(il_default_variable_c *symbol) {
//s4o.print("il_default_variable_c VISITOR!!\n");
symbol->var_name->accept(*this);
if (NULL != symbol->current_type) {
s4o.print(".");
symbol->current_type->accept(*this);
s4o.print("var");
}
return NULL;
}
private:
#if 0
I NEED TO FIX THIS!!!
TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO
void *visit(eno_param_c *symbol) {
if (this->is_variable_prefix_null()) {
s4o.print("*");
}
else {
this->print_variable_prefix();
}
s4o.print("ENO");
return NULL;
}
TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO
#endif
/*********************/
/* B 1.4 - Variables */
/*********************/
void *visit(symbolic_variable_c *symbol) {
unsigned int vartype = search_varfb_instance_type->get_vartype(symbol);
if (!current_param_is_pointer && (vartype == search_var_instance_decl_c::external_vt || vartype == search_var_instance_decl_c::located_vt)) {
s4o.print("*(");
generate_c_base_c::visit(symbol);
s4o.print(")");
}
else if (current_param_is_pointer && vartype != search_var_instance_decl_c::external_vt && vartype != search_var_instance_decl_c::located_vt) {
s4o.print("&(");
generate_c_base_c::visit(symbol);
s4o.print(")");
}
else {
generate_c_base_c::visit(symbol);
}
return NULL;
}
/********************************************/
/* B.1.4.1 Directly Represented Variables */
/********************************************/
// direct_variable: direct_variable_token {$$ = new direct_variable_c($1);};
void *visit(direct_variable_c *symbol) {
TRACE("direct_variable_c");
/* Do not use print_token() as it will change everything into uppercase */
if (strlen(symbol->value) == 0) ERROR;
if (!current_param_is_pointer) {
s4o.print("*(");
}
this->print_variable_prefix();
s4o.printlocation(symbol->value + 1);
if (!current_param_is_pointer) {
s4o.print(")");
}
return NULL;
}
/****************************************/
/* B.2 - Language IL (Instruction List) */
/****************************************/
/***********************************/
/* B 2.1 Instructions and Operands */
/***********************************/
/* please see the comment before the RET_operator_c visitor for details... */
#define END_LABEL VAR_LEADER "end"
/*| instruction_list il_instruction */
void *visit(instruction_list_c *symbol) {
/* Declare the backup to the default variable, that will store the result
* of the IL operations executed inside a parenthesis...
*/
declare_backup_variable();
/* Declare the default variable, that will store the result of the IL operations... */
s4o.print(s4o.indent_spaces);
s4o.print(IL_DEFVAR_T);
s4o.print(" ");
this->default_variable_name.accept(*this);
s4o.print(";\n");
s4o.print(s4o.indent_spaces);
print_backup_variable();
s4o.print(".INTvar = 0;\n\n");
print_list(symbol, s4o.indent_spaces, ";\n" + s4o.indent_spaces, ";\n");
/* label not used by at least one goto result in a warning.
* To work around this we introduce the useless goto
* to humour the compiler...
*/
s4o.print("\n");
s4o.print(s4o.indent_spaces);
s4o.print("/* to humour the compiler, we insert a goto */\n");
s4o.print(s4o.indent_spaces);
s4o.print("goto ");
s4o.print(END_LABEL);
s4o.print(";\n");
/* write the label marking the end of the code block */
/* please see the comment before the RET_operator_c visitor for details... */
s4o.print("\n");
s4o.print(s4o.indent_spaces);
s4o.print(END_LABEL);
s4o.print(":\n");
s4o.indent_right();
/* since every label must be followed by at least one statement, and
* only the functions will introduce the return statement after this label,
* function blocks written in IL would result in invalid C++ code.
* To work around this we introduce the equivalent of a 'nop' operation
* to humour the compiler...
*/
s4o.print(s4o.indent_spaces);
s4o.print("/* to humour the compiler, we insert a nop */\n");
s4o.print(s4o.indent_spaces);
this->default_variable_name.accept(*this);
s4o.print(" = ");
this->default_variable_name.accept(*this);
s4o.print(";\n");
s4o.indent_left();
return NULL;
}
/* | label ':' [il_incomplete_instruction] eol_list */
// SYM_REF2(il_instruction_c, label, il_instruction)
void *visit(il_instruction_c *symbol) {
if (NULL != symbol->label) {
symbol->label->accept(*this);
s4o.print(":\n");
s4o.print(s4o.indent_spaces);
}
symbol->il_instruction->accept(*this);
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) {
this->current_operand = symbol->il_operand;
if (NULL == this->current_operand) {
this->current_operand_type = NULL;
} else {
this->current_operand_type = search_expression_type->get_type(this->current_operand);
if (NULL == this->current_operand_type) ERROR;
}
symbol->il_simple_operator->accept(*this);
this->current_operand = NULL;
this->current_operand_type = NULL;
return NULL;
}
/* | function_name [il_operand_list] */
// SYM_REF2(il_function_call_c, function_name, il_operand_list)
void *visit(il_function_call_c *symbol) {
function_declaration_c *f_decl = function_symtable.find_value(symbol->function_name);
symbol_c* function_type_prefix = NULL;
symbol_c* function_name = NULL;
symbol_c* function_type_suffix = NULL;
std::list<FUNCTION_PARAM> param_list;
FUNCTION_PARAM *param;
symbol_c *param_data_type = default_variable_name.current_type;
symbol_c *return_data_type = NULL;
if (f_decl == function_symtable.end_value()) {
function_type_t current_function_type = get_function_type((identifier_c *)symbol->function_name);
if (current_function_type == function_none) ERROR;
return_data_type = (symbol_c *)search_expression_type->compute_standard_function_il(symbol, param_data_type);
if (NULL == return_data_type) ERROR;
function_call_param_iterator_c function_call_param_iterator(symbol);
/* Add the value from EN param */
ADD_PARAM_LIST((symbol_c*)(new boolean_literal_c((symbol_c*)(new bool_type_name_c()), new boolean_true_c())),
(symbol_c*)(new bool_type_name_c()),
function_param_iterator_c::direction_in)
/* Add the value from ENO param */
ADD_PARAM_LIST(NULL, (symbol_c*)(new bool_type_name_c()), function_param_iterator_c::direction_out)
int nb_param = 1;
if (symbol->il_operand_list != NULL)
nb_param += ((list_c *)symbol->il_operand_list)->n;
#include "il_code_gen.c"
}
else {
/* determine the base data type returned by the function being called... */
search_base_type_c search_base_type;
return_data_type = (symbol_c *)f_decl->type_name->accept(search_base_type);
if (NULL == return_data_type) 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;
function_call_param_iterator_c function_call_param_iterator(symbol);
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();
symbol_c *param_value = NULL;
/* if it is the first parameter, semantics specifies that we should
* get the value off the IL default variable!
*/
if (1 == i)
param_value = &this->default_variable_name;
/* 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);
/* Get the value from a foo(<param_value>) style call */
if (param_value == NULL)
param_value = function_call_param_iterator.next_nf();
if (param_value == NULL && 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_value, param_type, fp_iterator.param_direction())
} /* for(...) */
}
default_variable_name.current_type = return_data_type;
this->default_variable_name.accept(*this);
default_variable_name.current_type = param_data_type;
s4o.print(" = ");
if (function_type_prefix != NULL) {
s4o.print("(");
function_type_prefix->accept(*this);
s4o.print(")");
}
if (function_name != NULL)
function_name->accept(*this);
if (function_type_suffix != NULL)
function_type_suffix->accept(*this);
s4o.print("(");
s4o.indent_right();
std::list<FUNCTION_PARAM>::iterator pt;
for(pt = param_list.begin(); pt != param_list.end(); pt++) {
if (pt != param_list.begin())
s4o.print(",\n"+s4o.indent_spaces);
symbol_c *param_value = pt->param_value;
symbol_c *param_type = pt->param_type;
switch (pt->param_direction) {
case function_param_iterator_c::direction_in:
if (param_value == NULL) {
/* If not, get the default value of this variable's type */
param_value = (symbol_c *)param_type->accept(*type_initial_value_c::instance());
}
if (param_value == NULL) ERROR;
if (search_expression_type->is_literal_integer_type(param_type) ||
search_expression_type->is_literal_real_type(param_type)) {
if (function_type_suffix == NULL) ERROR;
function_type_suffix->accept(*this);
}
else
param_type->accept(*this);
if (search_base_type.type_is_subrange(param_type)) {
s4o.print("__CHECK_");
param_type->accept(*this);
s4o.print("(");
}
param_value->accept(*this);
if (search_base_type.type_is_subrange(param_type))
s4o.print(")");
break;
case function_param_iterator_c::direction_out:
case function_param_iterator_c::direction_inout:
current_param_is_pointer = true;
if (param_value == NULL) {
s4o.print("NULL");
} else {
param_value->accept(*this);
}
current_param_is_pointer = false;
break;
case function_param_iterator_c::direction_extref:
/* TODO! */
ERROR;
break;
} /* switch */
}
s4o.print(")");
/* the data type returned by the function, and stored in the il default variable... */
default_variable_name.current_type = return_data_type;
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 data type of the value currently stored
* in the default variable, and set the current data type to NULL
*/
symbol_c *old_current_default_variable_data_type = this->default_variable_name.current_type;
this->default_variable_name.current_type = NULL;
/* Pass the symbol->il_operand to the simple_instr_list visitor
* using the il_default_variable_init_value parameter...
* Note that the simple_instr_list_c visitor will set this parameter
* to NULL as soon as it does not require it any longer,
* so we don't do it here again after the
* symbol->simple_instr_list->accept(*this);
* returns...
*/
this->il_default_variable_init_value = symbol->il_operand;
/* Now do the parenthesised instructions... */
/* NOTE: the following code line will get the variable
* this->default_variable_name.current_type updated!
*/
symbol->simple_instr_list->accept(*this);
/* Now do the operation, using the previous result! */
/* NOTE: The result of the previous instruction list will be stored
* in a variable named IL_DEFVAR_BACK. This is done in the visitor
* to instruction_list_c objects...
*/
this->current_operand = &(this->default_variable_back_name);
this->current_operand_type = this->default_variable_back_name.current_type;
this->default_variable_name.current_type = old_current_default_variable_data_type;
if (NULL == this->current_operand_type) ERROR;
symbol->il_expr_operator->accept(*this);
this->current_operand = NULL;
this->current_operand_type = NULL;
this->default_variable_back_name.current_type = NULL;
return NULL;
}
/* il_jump_operator label */
// SYM_REF2(il_jump_operation_c, il_jump_operator, label)
void *visit(il_jump_operation_c *symbol) {
/* Pass the symbol->label to the il_jump_operation visitor
* using the jump_label parameter...
*/
this->jump_label = symbol->label;
symbol->il_jump_operator->accept(*this);
this->jump_label = NULL;
return NULL;
}
/* il_call_operator prev_declared_fb_name
* | il_call_operator prev_declared_fb_name '(' ')'
* | il_call_operator prev_declared_fb_name '(' eol_list ')'
* | il_call_operator prev_declared_fb_name '(' il_operand_list ')'
* | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')'
*/
// SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list)
void *visit(il_fb_call_c *symbol) {
symbol->il_call_operator->accept(*this);
s4o.print("{\n");
s4o.indent_right();
s4o.print(s4o.indent_spaces);
/* 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();
/* Get the value from a foo(<param_name> = <param_value>) style call */
symbol_c *param_value = function_call_param_iterator.search_f(param_name);
/* Get the value from a foo(<param_value>) style call */
if (param_value == NULL)
param_value = function_call_param_iterator.next_nf();
symbol_c *param_type = fp_iterator.param_type();
if (param_type == NULL) ERROR;
/* now output the value assignment */
if (param_value != NULL)
if ((param_direction == function_param_iterator_c::direction_in) ||
(param_direction == function_param_iterator_c::direction_inout)) {
symbol->fb_name->accept(*this);
s4o.print(".");
param_name->accept(*this);
s4o.print(" = ");
if (search_base_type.type_is_subrange(param_type)) {
s4o.print("__CHECK_");
param_type->accept(*this);
s4o.print("(");
}
param_value->accept(*this);
if (search_base_type.type_is_subrange(param_type))
s4o.print(")");
s4o.print(";\n" + s4o.indent_spaces);
}
} /* for(...) */
/* now call the function... */
function_block_type_name->accept(*this);
s4o.print(FB_FUNCTION_SUFFIX);
s4o.print("(&");
symbol->fb_name->accept(*this);
s4o.print(")");
/* loop through each function parameter, find the variable to which
* we should atribute the value of all output or inoutput parameters.
*/
fp_iterator.reset();
function_call_param_iterator.reset();
for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
/* Get the value from a foo(<param_name> = <param_value>) style call */
symbol_c *param_value = function_call_param_iterator.search_f(param_name);
/* Get the value from a foo(<param_value>) style call */
if (param_value == NULL)
param_value = function_call_param_iterator.next_nf();
/* now output the value assignment */
if (param_value != NULL)
if ((param_direction == function_param_iterator_c::direction_out) ||
(param_direction == function_param_iterator_c::direction_inout)) {
symbol_c *param_type = search_varfb_instance_type->get_type(param_value, false);
s4o.print(";\n"+ s4o.indent_spaces);
param_value->accept(*this);
s4o.print(" = ");
if (search_base_type.type_is_subrange(param_type)) {
s4o.print("__CHECK_");
param_type->accept(*this);
s4o.print("(");
}
symbol->fb_name->accept(*this);
s4o.print(".");
param_name->accept(*this);
if (search_base_type.type_is_subrange(param_type))
s4o.print(")");
}
} /* for(...) */
s4o.print(";\n");
s4o.indent_left();
s4o.print(s4o.indent_spaces);
s4o.print("}");
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) {
function_declaration_c *f_decl = function_symtable.find_value(symbol->function_name);
symbol_c* function_type_prefix = NULL;
symbol_c* function_name = NULL;
symbol_c* function_type_suffix = NULL;
std::list<FUNCTION_PARAM> param_list;
FUNCTION_PARAM *param;
symbol_c *return_data_type = NULL;
if (f_decl == function_symtable.end_value()) {
function_type_t current_function_type = get_function_type((identifier_c *)symbol->function_name);
if (current_function_type == function_none) ERROR;
return_data_type = (symbol_c *)search_expression_type->compute_standard_function_default(NULL, symbol);
if (NULL == return_data_type) ERROR;
function_call_param_iterator_c function_call_param_iterator(symbol);
int nb_param = 0;
if (symbol->il_param_list != NULL)
nb_param += ((list_c *)symbol->il_param_list)->n;
identifier_c en_param_name("EN");
/* Get the value from EN param */
symbol_c *EN_param_value = function_call_param_iterator.search_f(&en_param_name);
if (EN_param_value == NULL)
EN_param_value = (symbol_c*)(new boolean_literal_c((symbol_c*)(new bool_type_name_c()), new boolean_true_c()));
else
nb_param --;
ADD_PARAM_LIST(EN_param_value, (symbol_c*)(new bool_type_name_c()), function_param_iterator_c::direction_in)
identifier_c eno_param_name("EN0");
/* Get the value from ENO param */
symbol_c *ENO_param_value = function_call_param_iterator.search_f(&eno_param_name);
if (ENO_param_value != NULL)
nb_param --;
ADD_PARAM_LIST(ENO_param_value, (symbol_c*)(new bool_type_name_c()), function_param_iterator_c::direction_out)
#include "st_code_gen.c"
}
else {
/* determine the base data type returned by the function being called... */
search_base_type_c search_base_type;
return_data_type = (symbol_c *)f_decl->type_name->accept(search_base_type);
if (NULL == return_data_type) 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;
function_call_param_iterator_c function_call_param_iterator(symbol);
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();
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)
param_value = function_call_param_iterator.next_nf();
if (param_value == NULL) {
/* 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_value, param_type, fp_iterator.param_direction())
}
}
default_variable_name.current_type = return_data_type;
this->default_variable_name.accept(*this);
s4o.print(" = ");
if (function_type_prefix != NULL) {
s4o.print("(");
function_type_prefix->accept(*this);
s4o.print(")");
}
if (function_name != NULL)
function_name->accept(*this);
if (function_type_suffix != NULL)
function_type_suffix->accept(*this);
s4o.print("(");
s4o.indent_right();
std::list<FUNCTION_PARAM>::iterator pt;
for(pt = param_list.begin(); pt != param_list.end(); pt++) {
if (pt != param_list.begin())
s4o.print(",\n"+s4o.indent_spaces);
symbol_c *param_value = pt->param_value;
symbol_c *param_type = pt->param_type;
switch (pt->param_direction) {
case function_param_iterator_c::direction_in:
if (param_value == NULL) {
/* If not, get the default value of this variable's type */
param_value = (symbol_c *)param_type->accept(*type_initial_value_c::instance());
}
if (param_value == NULL) ERROR;
if (search_expression_type->is_literal_integer_type(param_type) ||
search_expression_type->is_literal_real_type(param_type)) {
if (function_type_suffix == NULL) ERROR;
function_type_suffix->accept(*this);
}
else
param_type->accept(*this);
if (search_base_type.type_is_subrange(param_type)) {
s4o.print("__CHECK_");
param_type->accept(*this);
s4o.print("(");
}
param_value->accept(*this);
if (search_base_type.type_is_subrange(param_type))
s4o.print(")");
break;
case function_param_iterator_c::direction_out:
case function_param_iterator_c::direction_inout:
current_param_is_pointer = true;
if (param_value == NULL) {
s4o.print("NULL");
} else {
param_value->accept(*this);
}
current_param_is_pointer = false;
break;
case function_param_iterator_c::direction_extref:
/* TODO! */
ERROR;
break;
} /* switch */
} /* for(...) */
// symbol->parameter_assignment->accept(*this);
s4o.print(")");
/* the data type returned by the function, and stored in the il default variable... */
return NULL;
}
/* | il_operand_list ',' il_operand */
// SYM_LIST(il_operand_list_c)
void *visit(il_operand_list_c *symbol) {ERROR; return NULL;} // should never get called!
/* | simple_instr_list il_simple_instruction */
// SYM_LIST(simple_instr_list_c)
void *visit(simple_instr_list_c *symbol) {
/* A simple_instr_list_c is used to store a list of il operations
* being done within parenthesis...
*
* e.g.:
* LD var1
* AND ( var2
* OR var3
* OR var4
* )
*
* This will be converted to C++ by defining a new scope
* with a new il default variable, and executing the il operands
* within this new scope.
* At the end of the scope the result, i.e. the value currently stored
* in the il default variable is copied to the variable used to take this
* value to the outside scope...
*
* The above example will result in the following C++ code:
* {__IL_DEFVAR_T __IL_DEFVAR_BACK;
* __IL_DEFVAR_T __IL_DEFVAR;
*
* __IL_DEFVAR.INTvar = var1;
* {
* __IL_DEFVAR_T __IL_DEFVAR;
*
* __IL_DEFVAR.INTvar = var2;
* __IL_DEFVAR.INTvar |= var3;
* __IL_DEFVAR.INTvar |= var4;
*
* __IL_DEFVAR_BACK = __IL_DEFVAR;
* }
* __IL_DEFVAR.INTvar &= __IL_DEFVAR_BACK.INTvar;
*
* }
*
* The intial value of the il default variable (in the above
* example 'var2') is passed to this simple_instr_list_c visitor
* using the il_default_variable_init_value parameter.
* Since it is possible to have parenthesis inside other parenthesis
* recursively, we reset the il_default_variable_init_value to NULL
* as soon as we no longer require it, as it may be used once again
* in the line
* print_list(symbol, s4o.indent_spaces, ";\n" + s4o.indent_spaces, ";\n");
*
*/
/* Declare the default variable, that will store the result of the IL operations... */
s4o.print("{\n");
s4o.indent_right();
s4o.print(s4o.indent_spaces);
s4o.print(IL_DEFVAR_T);
s4o.print(" ");
this->default_variable_name.accept(*this);
s4o.print(";\n\n");
/* Check whether we should initiliase the il default variable... */
if (NULL != this->il_default_variable_init_value) {
/* Yes, we must... */
/* We will do it by instatiating a LD operator, and having this
* same generate_c_il_c class visiting it!
*/
LD_operator_c ld_oper;
il_simple_operation_c il_simple_oper(&ld_oper, this->il_default_variable_init_value);
s4o.print(s4o.indent_spaces);
il_simple_oper.accept(*this);
s4o.print(";\n");
}
/* this parameter no longer required... */
this->il_default_variable_init_value = NULL;
print_list(symbol, s4o.indent_spaces, ";\n" + s4o.indent_spaces, ";\n");
/* copy the result in the default variable to the variable
* used to pass the data out to the scope enclosing
* the current scope!
*
* We also need to update the data type currently stored within
* the variable used to pass the data to the outside scope...
*/
this->default_variable_back_name.current_type = this->default_variable_name.current_type;
s4o.print("\n");
s4o.print(s4o.indent_spaces);
this->default_variable_back_name.accept(*this);
s4o.print(" = ");
this->default_variable_name.accept(*this);
s4o.print(";\n");
s4o.indent_left();
s4o.print(s4o.indent_spaces);
s4o.print("}\n");
s4o.print(s4o.indent_spaces);
return NULL;
}
/* | il_initial_param_list il_param_instruction */
// SYM_LIST(il_param_list_c)
void *visit(il_param_list_c *symbol) {ERROR; return NULL;} // should never get called!
/* il_assign_operator il_operand
* | il_assign_operator '(' eol_list simple_instr_list ')'
*/
// SYM_REF4(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list, unused)
void *visit(il_param_assignment_c *symbol) {ERROR; return NULL;} // should never get called!
/* il_assign_out_operator variable */
// SYM_REF2(il_param_out_assignment_c, il_assign_out_operator, variable);
void *visit(il_param_out_assignment_c *symbol) {ERROR; return NULL;} // should never get called!
/*******************/
/* B 2.2 Operators */
/*******************/
void *visit(LD_operator_c *symbol) {
/* the data type resulting from this operation... */
if (search_expression_type->is_literal_integer_type(this->current_operand_type))
this->default_variable_name.current_type = &(this->lint_type);
else if (search_expression_type->is_literal_real_type(this->current_operand_type))
this->default_variable_name.current_type = &(this->lreal_type);
else
this->default_variable_name.current_type = this->current_operand_type;
XXX_operator(&(this->default_variable_name), " = ", this->current_operand);
this->default_variable_name.current_type = this->current_operand_type;
return NULL;
}
void *visit(LDN_operator_c *symbol) {
/* the data type resulting from this operation... */
if (search_expression_type->is_literal_integer_type(this->current_operand_type))
this->default_variable_name.current_type = &(this->lword_type);
else
this->default_variable_name.current_type = this->current_operand_type;
XXX_operator(&(this->default_variable_name),
search_expression_type->is_bool_type(this->current_operand_type)?" = !":" = ~",
this->current_operand);
return NULL;
}
void *visit(ST_operator_c *symbol) {
symbol_c *operand_type = search_varfb_instance_type->get_type(this->current_operand, false);
this->current_operand->accept(*this);
s4o.print(" = ");
if (search_base_type.type_is_subrange(operand_type)) {
s4o.print("__CHECK_");
operand_type->accept(*this);
s4o.print("(");
}
if (search_expression_type->is_literal_integer_type(this->default_variable_name.current_type) ||
search_expression_type->is_literal_real_type(this->default_variable_name.current_type))
this->default_variable_name.current_type = this->current_operand_type;
this->default_variable_name.accept(*this);
if (search_base_type.type_is_subrange(operand_type))
s4o.print(")");
/* the data type resulting from this operation is unchamged. */
return NULL;
}
void *visit(STN_operator_c *symbol) {
symbol_c *operand_type = search_varfb_instance_type->get_type(this->current_operand, false);
this->current_operand->accept(*this);
s4o.print(" = ");
if (search_base_type.type_is_subrange(operand_type)) {
s4o.print("__CHECK_");
operand_type->accept(*this);
s4o.print("(");
}
if (search_expression_type->is_bool_type(this->current_operand_type))
s4o.print("!");
else
s4o.print("~");
if (search_expression_type->is_literal_integer_type(this->default_variable_name.current_type))
this->default_variable_name.current_type = this->current_operand_type;
this->default_variable_name.accept(*this);
if (search_base_type.type_is_subrange(operand_type))
s4o.print(")");
/* the data type resulting from this operation is unchamged. */
return NULL;
}
void *visit(NOT_operator_c *symbol) {
if ((NULL != this->current_operand) || (NULL != this->current_operand_type)) ERROR;
XXX_operator(&(this->default_variable_name),
search_expression_type->is_bool_type(this->default_variable_name.current_type)?" = !":" = ~",
&(this->default_variable_name));
/* the data type resulting from this operation is unchanged. */
return NULL;
}
void *visit(S_operator_c *symbol) {
if ((NULL == this->current_operand) || (NULL == this->current_operand_type)) ERROR;
C_modifier();
this->current_operand->accept(*this);
s4o.print(search_expression_type->is_bool_type(this->current_operand_type)?" = true":" = 1");
/* the data type resulting from this operation is unchanged! */
return NULL;
}
void *visit(R_operator_c *symbol) {
if ((NULL == this->current_operand) || (NULL == this->current_operand_type)) ERROR;
C_modifier();
this->current_operand->accept(*this);
s4o.print(search_expression_type->is_bool_type(this->current_operand_type)?" = false":" = 0");
/* the data type resulting from this operation is unchanged! */
return NULL;
}
void *visit(S1_operator_c *symbol) {return XXX_CAL_operator("S1", this->current_operand);}
void *visit(R1_operator_c *symbol) {return XXX_CAL_operator("R1", this->current_operand);}
void *visit(CLK_operator_c *symbol) {return XXX_CAL_operator("CLK", this->current_operand);}
void *visit(CU_operator_c *symbol) {return XXX_CAL_operator("CU", this->current_operand);}
void *visit(CD_operator_c *symbol) {return XXX_CAL_operator("CD", this->current_operand);}
void *visit(PV_operator_c *symbol) {return XXX_CAL_operator("PV", this->current_operand);}
void *visit(IN_operator_c *symbol) {return XXX_CAL_operator("IN", this->current_operand);}
void *visit(PT_operator_c *symbol) {return XXX_CAL_operator("PT", this->current_operand);}
void *visit(AND_operator_c *symbol) {
if (search_expression_type->is_binary_type(this->default_variable_name.current_type) &&
search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
BYTE_operator_result_type();
XXX_operator(&(this->default_variable_name), " &= ", this->current_operand);
/* the data type resulting from this operation... */
this->default_variable_name.current_type = this->current_operand_type;
}
else {ERROR;}
return NULL;
}
void *visit(OR_operator_c *symbol) {
if (search_expression_type->is_binary_type(this->default_variable_name.current_type) &&
search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
BYTE_operator_result_type();
XXX_operator(&(this->default_variable_name), " |= ", this->current_operand);
/* the data type resulting from this operation... */
this->default_variable_name.current_type = this->current_operand_type;
}
else {ERROR;}
return NULL;
}
void *visit(XOR_operator_c *symbol) {
if (search_expression_type->is_binary_type(this->default_variable_name.current_type) &&
search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
BYTE_operator_result_type();
// '^' is a bit by bit exclusive OR !! Also seems to work with boolean types!
XXX_operator(&(this->default_variable_name), " ^= ", this->current_operand);
/* the data type resulting from this operation... */
this->default_variable_name.current_type = this->current_operand_type;
}
else {ERROR;}
return NULL;
}
void *visit(ANDN_operator_c *symbol) {
if (search_expression_type->is_binary_type(this->default_variable_name.current_type) &&
search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
BYTE_operator_result_type();
XXX_operator(&(this->default_variable_name),
search_expression_type->is_bool_type(this->current_operand_type)?" &= !":" &= ~",
this->current_operand);
/* the data type resulting from this operation... */
this->default_variable_name.current_type = this->current_operand_type;
}
else {ERROR;}
return NULL;
}
void *visit(ORN_operator_c *symbol) {
if (search_expression_type->is_binary_type(this->default_variable_name.current_type) &&
search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
BYTE_operator_result_type();
XXX_operator(&(this->default_variable_name),
search_expression_type->is_bool_type(this->current_operand_type)?" |= !":" |= ~",
this->current_operand);
/* the data type resulting from this operation... */
this->default_variable_name.current_type = this->current_operand_type;
}
else {ERROR;}
return NULL;
}
void *visit(XORN_operator_c *symbol) {
if (search_expression_type->is_binary_type(this->default_variable_name.current_type) &&
search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
BYTE_operator_result_type();
XXX_operator(&(this->default_variable_name),
// bit by bit exclusive OR !! Also seems to work with boolean types!
search_expression_type->is_bool_type(this->current_operand_type)?" ^= !":" ^= ~",
this->current_operand);
/* the data type resulting from this operation... */
this->default_variable_name.current_type = this->current_operand_type;
}
else {ERROR;}
return NULL;
}
void *visit(ADD_operator_c *symbol) {
if (search_expression_type->is_time_type(this->default_variable_name.current_type) &&
search_expression_type->is_time_type(this->current_operand_type)) {
XXX_function("__TIME_ADD", &(this->default_variable_name), this->current_operand);
/* the data type resulting from this operation... */
this->default_variable_name.current_type = this->current_operand_type;
return NULL;
}
if (search_expression_type->is_num_type(this->default_variable_name.current_type) &&
search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
NUM_operator_result_type();
XXX_operator(&(this->default_variable_name), " += ", this->current_operand);
/* the data type resulting from this operation... */
this->default_variable_name.current_type = this->current_operand_type;
return NULL;
}
ERROR;
return NULL;
}
void *visit(SUB_operator_c *symbol) {
if (search_expression_type->is_time_type(this->default_variable_name.current_type) &&
search_expression_type->is_time_type(this->current_operand_type)) {
XXX_function("__TIME_SUB", &(this->default_variable_name), this->current_operand);
/* the data type resulting from this operation... */
this->default_variable_name.current_type = this->current_operand_type;
return NULL;
}
if (search_expression_type->is_num_type(this->default_variable_name.current_type) &&
search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
NUM_operator_result_type();
XXX_operator(&(this->default_variable_name), " -= ", this->current_operand);
/* the data type resulting from this operation... */
this->default_variable_name.current_type = this->current_operand_type;
return NULL;
}
ERROR;
return NULL;
}
void *visit(MUL_operator_c *symbol) {
if (search_expression_type->is_time_type(this->default_variable_name.current_type) &&
search_expression_type->is_integer_type(this->current_operand_type)) {
XXX_function("__TIME_MUL", &(this->default_variable_name), this->current_operand);
/* the data type resulting from this operation... */
return NULL;
}
if (search_expression_type->is_num_type(this->default_variable_name.current_type) &&
search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
NUM_operator_result_type();
XXX_operator(&(this->default_variable_name), " *= ", this->current_operand);
/* the data type resulting from this operation... */
this->default_variable_name.current_type = this->current_operand_type;
return NULL;
}
ERROR;
return NULL;
}
void *visit(DIV_operator_c *symbol) {
if (search_expression_type->is_time_type(this->default_variable_name.current_type) &&
search_expression_type->is_integer_type(this->current_operand_type)) {
XXX_function("__TIME_DIV", &(this->default_variable_name), this->current_operand);
/* the data type resulting from this operation... */
return NULL;
}
if (search_expression_type->is_num_type(this->default_variable_name.current_type) &&
search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
NUM_operator_result_type();
XXX_operator(&(this->default_variable_name), " /= ", this->current_operand);
/* the data type resulting from this operation... */
this->default_variable_name.current_type = this->current_operand_type;
}
ERROR;
return NULL;
}
void *visit(MOD_operator_c *symbol) {
if (search_expression_type->is_num_type(this->default_variable_name.current_type) &&
search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type)) {
NUM_operator_result_type();
XXX_operator(&(this->default_variable_name), " %= ", this->current_operand);
/* the data type resulting from this operation... */
this->default_variable_name.current_type = this->current_operand_type;
}
ERROR;
return NULL;
}
void *visit(GT_operator_c *symbol) {
if (!search_base_type.type_is_enumerated(this->default_variable_name.current_type) &&
search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type))
return CMP_operator(this->current_operand, "__gt_");
ERROR;
return NULL;
}
void *visit(GE_operator_c *symbol) {
if (!search_base_type.type_is_enumerated(this->default_variable_name.current_type) &&
search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type))
return CMP_operator(this->current_operand, "__ge_");
ERROR;
return NULL;
}
void *visit(EQ_operator_c *symbol) {
if (search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type))
return CMP_operator(this->current_operand, "__eq_");
ERROR;
return NULL;
}
void *visit(LT_operator_c *symbol) {
if (!search_base_type.type_is_enumerated(this->default_variable_name.current_type) &&
search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type))
return CMP_operator(this->current_operand, "__lt_");
ERROR;
return NULL;
}
void *visit(LE_operator_c *symbol) {
if (!search_base_type.type_is_enumerated(this->default_variable_name.current_type) &&
search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type))
return CMP_operator(this->current_operand, "__le_");
ERROR;
return NULL;
}
void *visit(NE_operator_c *symbol) {
if (search_expression_type->is_same_type(this->default_variable_name.current_type, this->current_operand_type))
return CMP_operator(this->current_operand, "__ne_");
ERROR;
return NULL;
}
//SYM_REF0(CAL_operator_c)
// This method will be called from within the il_fb_call_c visitor method
void *visit(CAL_operator_c *symbol) {return NULL;}
//SYM_REF0(CALC_operator_c)
// This method will be called from within the il_fb_call_c visitor method
void *visit(CALC_operator_c *symbol) {C_modifier(); return NULL;}
//SYM_REF0(CALCN_operator_c)
// This method will be called from within the il_fb_call_c visitor method
void *visit(CALCN_operator_c *symbol) {CN_modifier(); return NULL;}
/* NOTE: The semantics of the RET operator requires us to return a value
* if the IL code is inside a function, but simply return no value if
* the IL code is inside a function block or program!
* Nevertheless, it is the generate_c_c class itself that
* introduces the 'reaturn <value>' into the c++ code at the end
* of every function. This class does not know whether the IL code
* is inside a function or a function block.
* We work around this by jumping to the end of the code,
* that will be marked by the END_LABEL label in the
* instruction_list_c visitor...
*/
// SYM_REF0(RET_operator_c)
void *visit(RET_operator_c *symbol) {
s4o.print("goto ");s4o.print(END_LABEL);
return NULL;
}
// SYM_REF0(RETC_operator_c)
void *visit(RETC_operator_c *symbol) {
C_modifier();
s4o.print("goto ");s4o.print(END_LABEL);
return NULL;
}
// SYM_REF0(RETCN_operator_c)
void *visit(RETCN_operator_c *symbol) {
CN_modifier();
s4o.print("goto ");s4o.print(END_LABEL);
return NULL;
}
//SYM_REF0(JMP_operator_c)
void *visit(JMP_operator_c *symbol) {
if (NULL == this->jump_label) ERROR;
s4o.print("goto ");
this->jump_label->accept(*this);
/* the data type resulting from this operation is unchanged! */
return NULL;
}
// SYM_REF0(JMPC_operator_c)
void *visit(JMPC_operator_c *symbol) {
if (NULL == this->jump_label) ERROR;
C_modifier();
s4o.print("goto ");
this->jump_label->accept(*this);
/* the data type resulting from this operation is unchanged! */
return NULL;
}
// SYM_REF0(JMPCN_operator_c)
void *visit(JMPCN_operator_c *symbol) {
if (NULL == this->jump_label) ERROR;
CN_modifier();
s4o.print("goto ");
this->jump_label->accept(*this);
/* the data type resulting from this operation is unchanged! */
return NULL;
}
#if 0
/*| [NOT] any_identifier SENDTO */
SYM_REF2(il_assign_out_operator_c, option, variable_name)
#endif
}; /* generate_c_il_c */
/* The implementation of the single visit() member function
* of il_default_variable_c.
* It can only come after the full declaration of
* generate_c_il_c. Since we define and declare
* generate_c_il_c simultaneously, it can only come
* after the definition...
*/
void *il_default_variable_c::accept(visitor_c &visitor) {
/* An ugly hack!! */
/* This is required because we need to over-ride the base
* accept(visitor_c &) method of the class symbol_c,
* so this method may be called through a symbol_c *
* reference!
*
* But, the visitor_c does not include a visitor to
* an il_default_variable_c, which means that we couldn't
* simply call visitor.visit(this);
*
* We therefore need to use the dynamic_cast hack!!
*
* Note too that we can't cast a visitor_c to a
* il_default_variable_visitor_c, since they are not related.
* Nor may the il_default_variable_visitor_c inherit from
* visitor_c, because then generate_c_il_c would contain
* two visitor_c base classes, one each through
* il_default_variable_visitor_c and generate_c_type_c
*
* We could use virtual inheritance of the visitor_c, but it
* would probably create more problems than it is worth!
*/
generate_c_il_c *v;
v = dynamic_cast<generate_c_il_c *>(&visitor);
if (v == NULL) ERROR;
return v->visit(this);
}
il_default_variable_c::il_default_variable_c(const char *var_name_str, symbol_c *current_type) {
if (NULL == var_name_str) ERROR;
/* Note: current_type may start off with NULL */
this->var_name = new identifier_c(var_name_str);
if (NULL == this->var_name) ERROR;
this->current_type = current_type;
}