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/*

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 *  matiec - a compiler for the programming languages defined in IEC 61131-3

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 *

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 *  Copyright (C) 2009-2012  Mario de Sousa (msousa@fe.up.pt)

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 *  Copyright (C) 2012       Manuele Conti (manuele.conti@sirius-es.it)

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 *  Copyright (C) 2012       Matteo Facchinetti (matteo.facchinetti@sirius-es.it)

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 *

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 *  This program is free software: you can redistribute it and/or modify

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 *  it under the terms of the GNU General Public License as published by

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 *  the Free Software Foundation, either version 3 of the License, or

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 *  (at your option) any later version.

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 *

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 *  This program is distributed in the hope that it will be useful,

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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 *  GNU General Public License for more details.

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 *

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 *  You should have received a copy of the GNU General Public License

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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.

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 *

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 *

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 * This code is made available on the understanding that it will not be

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 * used in safety-critical situations without a full and competent review.

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 */

    25

    26

/*

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 * An IEC 61131-3 compiler.

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 *

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 * Based on the

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 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)

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 *

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 */

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    34

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/*

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 *  Fill candidate list of data types for all symbols

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 */

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#include "fill_candidate_datatypes.hh"

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#include "datatype_functions.hh"

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#include <typeinfo>

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#include <list>

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#include <string>

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#include <string.h>

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#include <strings.h>

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    47

/* set to 1 to see debug info during execution */

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static int debug = 0;

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    50

fill_candidate_datatypes_c::fill_candidate_datatypes_c(symbol_c *ignore) {

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}

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    53

fill_candidate_datatypes_c::~fill_candidate_datatypes_c(void) {

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}

    55

    56

symbol_c *fill_candidate_datatypes_c::widening_conversion(symbol_c *left_type, symbol_c *right_type, const struct widen_entry widen_table[]) {

    57

	int k;

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	/* find a widening table entry compatible */

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	for (k = 0; NULL != widen_table[k].left;  k++)

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		if ((typeid(*left_type) == typeid(*widen_table[k].left)) && (typeid(*right_type) == typeid(*widen_table[k].right)))

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			return widen_table[k].result;

    62

	return NULL;

    63

}

    64

    65

    66

    67

    68

/* returns true if compatible function/FB invocation, otherwise returns false */

    69

/* Assumes that the candidate_datatype lists of all the parameters being passed haved already been filled in */

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/*

    71

 * All parameters being passed to the called function MUST be in the parameter list to which f_call points to!

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 * This means that, for non formal function calls in IL, de current (default value) must be artificially added to the

    73

 * beginning of the parameter list BEFORE calling handle_function_call().

    74

 */

    75

bool fill_candidate_datatypes_c::match_nonformal_call(symbol_c *f_call, symbol_c *f_decl) {

    76

	symbol_c *call_param_value,  *param_datatype;

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	identifier_c *param_name;

    78

	function_param_iterator_c       fp_iterator(f_decl);

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	function_call_param_iterator_c fcp_iterator(f_call);

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	int extensible_parameter_highest_index = -1;

    81

	unsigned int i;

    82

    83

	/* Iterating through the non-formal parameters of the function call */

    84

	while((call_param_value = fcp_iterator.next_nf()) != NULL) {

    85

		/* Iterate to the next parameter of the function being called.

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		 * Get the name of that parameter, and ignore if EN or ENO.

    87

		 */

    88

		do {

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			param_name = fp_iterator.next();

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			/* If there is no other parameter declared, then we are passing too many parameters... */

    91

			if(param_name == NULL) return false;

    92

		} while ((strcmp(param_name->value, "EN") == 0) || (strcmp(param_name->value, "ENO") == 0));

    93

    95

		/* Get the parameter type */

    96

		param_datatype = base_type(fp_iterator.param_type());

    97

    98

		/* check whether one of the candidate_data_types of the value being passed is the same as the param_type */

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		if (search_in_candidate_datatype_list(param_datatype, call_param_value->candidate_datatypes) < 0)

   100

			return false; /* return false if param_type not in the list! */

   101

	}

   102

	/* call is compatible! */

   103

	return true;

   104

}

   105

   106

   107

   108

/* returns true if compatible function/FB invocation, otherwise returns false */

   109

/* Assumes that the candidate_datatype lists of all the parameters being passed haved already been filled in */

   111

	symbol_c *call_param_value, *call_param_name, *param_datatype;

   112

	symbol_c *verify_duplicate_param;

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	identifier_c *param_name;

   114

	function_param_iterator_c       fp_iterator(f_decl);

   115

	function_call_param_iterator_c fcp_iterator(f_call);

   116

	int extensible_parameter_highest_index = -1;

   117

	identifier_c *extensible_parameter_name;

   118

	unsigned int i;

   120

   121

	/* Iterating through the formal parameters of the function call */

   122

	while((call_param_name = fcp_iterator.next_f()) != NULL) {

   123

		/* Obtaining the value being passed in the function call */

   124

		call_param_value = fcp_iterator.get_current_value();

   125

		/* the following should never occur. If it does, then we have a bug in our code... */

   126

		if (NULL == call_param_value) ERROR;

   127

   128

		/* Obtaining the assignment direction:  := (assign_in) or => (assign_out) */

   129

		function_call_param_iterator_c::assign_direction_t call_param_dir = fcp_iterator.get_assign_direction();

   130

   131

		/* Checking if there are duplicated parameter values */

   132

		verify_duplicate_param = fcp_iterator.search_f(call_param_name);

   133

		if(verify_duplicate_param != call_param_value)

   134

			return false;

   135

   136

		/* Obtaining the type of the value being passed in the function call */

   137

		std::vector <symbol_c *>&call_param_types = call_param_value->candidate_datatypes;

   138

   139

		/* Find the corresponding parameter in function declaration */

   140

		param_name = fp_iterator.search(call_param_name);

   141

		if(param_name == NULL) return false;

   142

		/* Get the parameter data type */

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		param_datatype = base_type(fp_iterator.param_type());

   144

		/* Get the parameter direction: IN, OUT, IN_OUT */

   145

		function_param_iterator_c::param_direction_t param_dir = fp_iterator.param_direction();

   146

   147

		/* check whether direction (IN, OUT, IN_OUT) and assignment types (:= , =>) are compatible !!! */

   148

		if          (function_call_param_iterator_c::assign_in  == call_param_dir) {

   149

			if ((function_param_iterator_c::direction_in    != param_dir) &&

   150

			    (function_param_iterator_c::direction_inout != param_dir))

   151

				return false;

   152

		} else if   (function_call_param_iterator_c::assign_out == call_param_dir) {

   153

			if ((function_param_iterator_c::direction_out   != param_dir))

   154

				return false;

   155

		} else ERROR;

   156

   157

		/* check whether one of the candidate_data_types of the value being passed is the same as the param_type */

   158

		if (search_in_candidate_datatype_list(param_datatype, call_param_types) < 0)

   159

			return false; /* return false if param_type not in the list! */

   166

	}

   167

	/* call is compatible! */

   168

	return true;

   169

}

   170

   171

   172

   173

   174

/* Handle a generic function call!

   175

 * Assumes that the parameter_list containing the values being passed in this function invocation

   176

 * has already had all the candidate_datatype lists filled in!

   177

 *

   178

 * All parameters being passed to the called function MUST be in the parameter list to which f_call points to!

   179

 * This means that, for non formal function calls in IL, de current (default value) must be artificially added to the

   180

 * beginning of the parameter list BEFORE calling handle_function_call().

   181

 */

   182

/*

   183

typedef struct {

   184

  symbol_c *function_name,

   185

  symbol_c *nonformal_operand_list,

   186

  symbol_c *   formal_operand_list,

   187

   188

  std::vector <symbol_c *> &candidate_functions,  

   189

  symbol_c &*called_function_declaration,

   190

  int      &extensible_param_count

   191

} generic_function_call_t;

   192

*/

   193

/*

   194

void narrow_candidate_datatypes_c::narrow_function_invocation(symbol_c *fcall, generic_function_call_t fcall_data) {

   195

void *fill_candidate_datatypes_c::handle_function_call(symbol_c *f_call, symbol_c *function_name, invocation_type_t invocation_type,

   196

                                                       std::vector <symbol_c *> *candidate_datatypes,

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                                                       std::vector <symbol_c *> *candidate_functions) {

   198

  */

   199

void fill_candidate_datatypes_c::handle_function_call(symbol_c *fcall, generic_function_call_t fcall_data) {

   200

	function_declaration_c *f_decl;

   201

	list_c *parameter_list;

   202

	list_c *parameter_candidate_datatypes;

   203

	symbol_c *returned_parameter_type;

   204

   205

	if (debug) std::cout << "function()\n";

   206

   207

	function_symtable_t::iterator lower = function_symtable.lower_bound(fcall_data.function_name);

   208

	function_symtable_t::iterator upper = function_symtable.upper_bound(fcall_data.function_name);

   209

	/* If the name of the function being called is not found in the function symbol table, then this is an invalid call */

   210

	/* Since the lexical parser already checks for this, then if this occurs then we have an internal compiler error. */

   211

	if (lower == function_symtable.end()) ERROR;

   212

   213

	/* Look for all compatible function declarations, and add their return datatypes 

   214

	 * to the candidate_datatype list of this function invocation. 

   215

	 *

   216

	 * If only one function exists, we add its return datatype to the candidate_datatype list,

   217

	 * even if the parameters passed to it are invalid.

   218

	 * This guarantees that the remainder of the expression in which the function call is inserted

   219

	 * is treated as if the function call returns correctly, and therefore does not generate

   220

	 * spurious error messages.

   221

	 * Even if the parameters to the function call are invalid, doing this is still safe, as the 

   222

	 * expressions inside the function call will themselves have erros and will  guarantee that 

   223

	 * compilation is aborted in stage3 (in print_datatypes_error_c).

   224

	 */

   225

	if (function_symtable.multiplicity(fcall_data.function_name) == 1) {

   226

		f_decl = function_symtable.get_value(lower);

   227

		returned_parameter_type = base_type(f_decl->type_name);

   228

		fcall_data.candidate_functions.push_back(f_decl);

   229

		fcall->    candidate_datatypes.push_back(returned_parameter_type);

   230

	}

   231

	for(; lower != upper; lower++) {

   232

		bool compatible = false;

   233

   234

		f_decl = function_symtable.get_value(lower);

   235

		/* Check if function declaration in symbol_table is compatible with parameters */

   236

		if (NULL != fcall_data.nonformal_operand_list) compatible=match_nonformal_call(fcall, f_decl);

   237

		if (NULL != fcall_data.   formal_operand_list) compatible=   match_formal_call(fcall, f_decl);

   238

		if (compatible) {

   239

			/* Add the data type returned by the called functions. 

   240

			 * However, only do this if this data type is not already present in the candidate_datatypes list_c

   241

			 */

   242

			/* TODO

   243

			 * call  int search_in_datatype_list(symbol_c *datatype, std::vector <symbol_c *> candidate_datatypes);

   244

			 * instead of using for loop!

   245

			 */

   246

			unsigned int k;

   247

			returned_parameter_type = base_type(f_decl->type_name);

   248

			for(k = 0; k < fcall->candidate_datatypes.size(); k++) {

   249

				if (is_type_equal(returned_parameter_type, fcall->candidate_datatypes[k]))

   250

					break;

   251

			}

   252

			if (k >= fcall->candidate_datatypes.size()) {

   253

				fcall->    candidate_datatypes.push_back(returned_parameter_type);

   254

				fcall_data.candidate_functions.push_back(f_decl);

   255

			}

   256

		}

   257

	}

   258

	if (debug) std::cout << "end_function() [" << fcall->candidate_datatypes.size() << "] result.\n";

   259

	return;

   260

}

   261

   262

   263

/* handle implicit FB call in IL.

   264

 * e.g.  CLK ton_var

   265

 *        CU counter_var

   266

 */

   267

void fill_candidate_datatypes_c::handle_implicit_il_fb_call(symbol_c *il_instruction, const char *param_name, symbol_c *&called_fb_declaration) {

   268

	symbol_c *fb_type_id = search_varfb_instance_type->get_basetype_id(il_operand);

   271

   272

	function_block_declaration_c *fb_decl = function_block_type_symtable.find_value(fb_type_id);

   273

	if (function_block_type_symtable.end_value() == fb_decl)

   274

		/* The il_operand is not the name of a FB instance. Most probably it is the name of a variable of some other type.

   276

		 */

   282

	 */

   290

}

   291

   292

   293

/* a helper function... */

   294

symbol_c *fill_candidate_datatypes_c::base_type(symbol_c *symbol) {

   295

	/* NOTE: symbol == NULL is valid. It will occur when, for e.g., an undefined/undeclared symbolic_variable is used

   296

	 *       in the code.

   297

	 */

   298

	if (symbol == NULL) return NULL;

   299

	return (symbol_c *)symbol->accept(search_base_type);

   300

}

   301

   302

/*********************/

   303

/* B 1.2 - Constants */

   304

/*********************/

   305

/******************************/

   306

/* B 1.2.1 - Numeric Literals */

   307

/******************************/

   308

void *fill_candidate_datatypes_c::visit(real_c *symbol) {

   309

	int calc_size;

   310

   311

	calc_size = sizeoftype(symbol);

   312

	if (calc_size <= sizeoftype(&search_constant_type_c::real_type_name))

   313

		symbol->candidate_datatypes.push_back(&search_constant_type_c::real_type_name);

   314

	if (calc_size <= sizeoftype(&search_constant_type_c::lreal_type_name))

   315

		symbol->candidate_datatypes.push_back(&search_constant_type_c::lreal_type_name);

   316

	if (debug) std::cout << "ANY_REAL [" << symbol->candidate_datatypes.size() << "]" << std::endl;

   317

	return NULL;

   318

}

   319

   320

void *fill_candidate_datatypes_c::visit(integer_c *symbol) {

   321

	int calc_size;

   322

   323

	calc_size = sizeoftype(symbol);

   324

	if (calc_size <= sizeoftype(&search_constant_type_c::bool_type_name))

   325

	        symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);

   326

	if (calc_size <= sizeoftype(&search_constant_type_c::byte_type_name))

   327

		symbol->candidate_datatypes.push_back(&search_constant_type_c::byte_type_name);

   328

	if (calc_size <= sizeoftype(&search_constant_type_c::word_type_name))

   329

		symbol->candidate_datatypes.push_back(&search_constant_type_c::word_type_name);

   330

	if (calc_size <= sizeoftype(&search_constant_type_c::dword_type_name))

   331

		symbol->candidate_datatypes.push_back(&search_constant_type_c::dword_type_name);

   332

	if (calc_size <= sizeoftype(&search_constant_type_c::lword_type_name))

   333

		symbol->candidate_datatypes.push_back(&search_constant_type_c::lword_type_name);

   334

   335

	if (calc_size < sizeoftype(&search_constant_type_c::sint_type_name))

   336

		symbol->candidate_datatypes.push_back(&search_constant_type_c::sint_type_name);

   337

	if (calc_size < sizeoftype(&search_constant_type_c::int_type_name))

   338

		symbol->candidate_datatypes.push_back(&search_constant_type_c::int_type_name);

   339

	if (calc_size < sizeoftype(&search_constant_type_c::dint_type_name))

   340

		symbol->candidate_datatypes.push_back(&search_constant_type_c::dint_type_name);

   341

	if (calc_size < sizeoftype(&search_constant_type_c::lint_type_name))

   342

		symbol->candidate_datatypes.push_back(&search_constant_type_c::lint_type_name);

   343

	if (calc_size <= sizeoftype(&search_constant_type_c::usint_type_name))

   344

		symbol->candidate_datatypes.push_back(&search_constant_type_c::usint_type_name);

   345

	if (calc_size <= sizeoftype(&search_constant_type_c::uint_type_name))

   346

		symbol->candidate_datatypes.push_back(&search_constant_type_c::uint_type_name);

   347

	if (calc_size <= sizeoftype(&search_constant_type_c::udint_type_name))

   348

		symbol->candidate_datatypes.push_back(&search_constant_type_c::udint_type_name);

   349

	if (calc_size <= sizeoftype(&search_constant_type_c::ulint_type_name))

   350

		symbol->candidate_datatypes.push_back(&search_constant_type_c::ulint_type_name);

   351

	if (debug) std::cout << "ANY_INT [" << symbol->candidate_datatypes.size()<< "]" << std::endl;

   352

	return NULL;

   353

}

   354

   355

void *fill_candidate_datatypes_c::visit(neg_real_c *symbol) {

   356

	if (sizeoftype(symbol) <= sizeoftype(&search_constant_type_c::real_type_name))

   357

		symbol->candidate_datatypes.push_back(&search_constant_type_c::real_type_name);

   358

	symbol->candidate_datatypes.push_back(&search_constant_type_c::lreal_type_name);

   359

	if (debug) std::cout << "neg ANY_REAL [" << symbol->candidate_datatypes.size() << "]" << std::endl;

   360

	return NULL;

   361

}

   362

   363

void *fill_candidate_datatypes_c::visit(neg_integer_c *symbol) {

   364

	int calc_size;

   365

   366

	calc_size = sizeoftype(symbol);

   367

	if (calc_size <= sizeoftype(&search_constant_type_c::int_type_name))

   368

		symbol->candidate_datatypes.push_back(&search_constant_type_c::int_type_name);

   369

	if (calc_size <= sizeoftype(&search_constant_type_c::sint_type_name))

   370

		symbol->candidate_datatypes.push_back(&search_constant_type_c::sint_type_name);

   371

	if (calc_size <= sizeoftype(&search_constant_type_c::dint_type_name))

   372

		symbol->candidate_datatypes.push_back(&search_constant_type_c::dint_type_name);

   373

	if (calc_size <= sizeoftype(&search_constant_type_c::lint_type_name))

   374

		symbol->candidate_datatypes.push_back(&search_constant_type_c::lint_type_name);

   375

	if (debug) std::cout << "neg ANY_INT [" << symbol->candidate_datatypes.size() << "]" << std::endl;

   376

	return NULL;

   377

}

   378

   379

void *fill_candidate_datatypes_c::visit(binary_integer_c *symbol) {

   380

	int calc_size;

   381

   382

	calc_size = sizeoftype(symbol);

   383

	if (calc_size <= sizeoftype(&search_constant_type_c::bool_type_name))

   384

	        symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);

   385

	if (calc_size <= sizeoftype(&search_constant_type_c::byte_type_name))

   386

		symbol->candidate_datatypes.push_back(&search_constant_type_c::byte_type_name);

   387

	if (calc_size <= sizeoftype(&search_constant_type_c::word_type_name))

   388

		symbol->candidate_datatypes.push_back(&search_constant_type_c::word_type_name);

   389

	if (calc_size <= sizeoftype(&search_constant_type_c::dword_type_name))

   390

		symbol->candidate_datatypes.push_back(&search_constant_type_c::dword_type_name);

   391

	if (calc_size <= sizeoftype(&search_constant_type_c::lword_type_name))

   392

		symbol->candidate_datatypes.push_back(&search_constant_type_c::lword_type_name);

   393

   394

	if (calc_size < sizeoftype(&search_constant_type_c::sint_type_name))

   395

		symbol->candidate_datatypes.push_back(&search_constant_type_c::sint_type_name);

   396

	if (calc_size < sizeoftype(&search_constant_type_c::int_type_name))

   397

		symbol->candidate_datatypes.push_back(&search_constant_type_c::int_type_name);

   398

	if (calc_size < sizeoftype(&search_constant_type_c::dint_type_name))

   399

		symbol->candidate_datatypes.push_back(&search_constant_type_c::dint_type_name);

   400

	if (calc_size < sizeoftype(&search_constant_type_c::lint_type_name))

   401

		symbol->candidate_datatypes.push_back(&search_constant_type_c::lint_type_name);

   402

	if (calc_size <= sizeoftype(&search_constant_type_c::usint_type_name))

   403

		symbol->candidate_datatypes.push_back(&search_constant_type_c::usint_type_name);

   404

	if (calc_size <= sizeoftype(&search_constant_type_c::uint_type_name))

   405

		symbol->candidate_datatypes.push_back(&search_constant_type_c::uint_type_name);

   406

	if (calc_size <= sizeoftype(&search_constant_type_c::udint_type_name))

   407

		symbol->candidate_datatypes.push_back(&search_constant_type_c::udint_type_name);

   408

	if (calc_size <= sizeoftype(&search_constant_type_c::ulint_type_name))

   409

		symbol->candidate_datatypes.push_back(&search_constant_type_c::ulint_type_name);

   410

	if (debug) std::cout << "ANY_INT [" << symbol->candidate_datatypes.size()<< "]" << std::endl;

   411

	return NULL;

   412

}

   413

   414

void *fill_candidate_datatypes_c::visit(octal_integer_c *symbol) {

   415

	int calc_size;

   416

   417

	calc_size = sizeoftype(symbol);

   418

	if (calc_size <= sizeoftype(&search_constant_type_c::bool_type_name))

   419

	        symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);

   420

	if (calc_size <= sizeoftype(&search_constant_type_c::byte_type_name))

   421

		symbol->candidate_datatypes.push_back(&search_constant_type_c::byte_type_name);

   422

	if (calc_size <= sizeoftype(&search_constant_type_c::word_type_name))

   423

		symbol->candidate_datatypes.push_back(&search_constant_type_c::word_type_name);

   424

	if (calc_size <= sizeoftype(&search_constant_type_c::dword_type_name))

   425

		symbol->candidate_datatypes.push_back(&search_constant_type_c::dword_type_name);

   426

	if (calc_size <= sizeoftype(&search_constant_type_c::lword_type_name))

   427

		symbol->candidate_datatypes.push_back(&search_constant_type_c::lword_type_name);

   428

   429

	if (calc_size < sizeoftype(&search_constant_type_c::sint_type_name))

   430

		symbol->candidate_datatypes.push_back(&search_constant_type_c::sint_type_name);

   431

	if (calc_size < sizeoftype(&search_constant_type_c::int_type_name))

   432

		symbol->candidate_datatypes.push_back(&search_constant_type_c::int_type_name);

   433

	if (calc_size < sizeoftype(&search_constant_type_c::dint_type_name))

   434

		symbol->candidate_datatypes.push_back(&search_constant_type_c::dint_type_name);

   435

	if (calc_size < sizeoftype(&search_constant_type_c::lint_type_name))

   436

		symbol->candidate_datatypes.push_back(&search_constant_type_c::lint_type_name);

   437

	if (calc_size <= sizeoftype(&search_constant_type_c::usint_type_name))

   438

		symbol->candidate_datatypes.push_back(&search_constant_type_c::usint_type_name);

   439

	if (calc_size <= sizeoftype(&search_constant_type_c::uint_type_name))

   440

		symbol->candidate_datatypes.push_back(&search_constant_type_c::uint_type_name);

   441

	if (calc_size <= sizeoftype(&search_constant_type_c::udint_type_name))

   442

		symbol->candidate_datatypes.push_back(&search_constant_type_c::udint_type_name);

   443

	if (calc_size <= sizeoftype(&search_constant_type_c::ulint_type_name))

   444

		symbol->candidate_datatypes.push_back(&search_constant_type_c::ulint_type_name);

   445

	if (debug) std::cout << "ANY_INT [" << symbol->candidate_datatypes.size()<< "]" << std::endl;

   446

	return NULL;

   447

}

   448

   449

void *fill_candidate_datatypes_c::visit(hex_integer_c *symbol) {

   450

	int calc_size;

   451

   452

	calc_size = sizeoftype(symbol);

   453

	if (calc_size <= sizeoftype(&search_constant_type_c::bool_type_name))

   454

	        symbol->candidate_datatypes.push_back(&search_constant_type_c::bool_type_name);

   455

	if (calc_size <= sizeoftype(&search_constant_type_c::byte_type_name))

   456

		symbol->candidate_datatypes.push_back(&search_constant_type_c::byte_type_name);

   457

	if (calc_size <= sizeoftype(&search_constant_type_c::word_type_name))

   458

		symbol->candidate_datatypes.push_back(&search_constant_type_c::word_type_name);

   459

	if (calc_size <= sizeoftype(&search_constant_type_c::dword_type_name))

   460

		symbol->candidate_datatypes.push_back(&search_constant_type_c::dword_type_name);

   461

	if (calc_size <= sizeoftype(&search_constant_type_c::lword_type_name))

   462

		symbol->candidate_datatypes.push_back(&search_constant_type_c::lword_type_name);

   463

   464

	if (calc_size < sizeoftype(&search_constant_type_c::sint_type_name))

   465

		symbol->candidate_datatypes.push_back(&search_constant_type_c::sint_type_name);

   466

	if (calc_size < sizeoftype(&search_constant_type_c::int_type_name))

   467

		symbol->candidate_datatypes.push_back(&search_constant_type_c::int_type_name);

   468

	if (calc_size < sizeoftype(&search_constant_type_c::dint_type_name))

   469

		symbol->candidate_datatypes.push_back(&search_constant_type_c::dint_type_name);

   470

	if (calc_size < sizeoftype(&search_constant_type_c::lint_type_name))

   471

		symbol->candidate_datatypes.push_back(&search_constant_type_c::lint_type_name);

   472

	if (calc_size <= sizeoftype(&search_constant_type_c::usint_type_name))

   473

		symbol->candidate_datatypes.push_back(&search_constant_type_c::usint_type_name);

   474

	if (calc_size <= sizeoftype(&search_constant_type_c::uint_type_name))

   475

		symbol->candidate_datatypes.push_back(&search_constant_type_c::uint_type_name);

   476

	if (calc_size <= sizeoftype(&search_constant_type_c::udint_type_name))

   477

		symbol->candidate_datatypes.push_back(&search_constant_type_c::udint_type_name);

   478

	if (calc_size <= sizeoftype(&search_constant_type_c::ulint_type_name))

   479

		symbol->candidate_datatypes.push_back(&search_constant_type_c::ulint_type_name);

   480

	if (debug) std::cout << "ANY_INT [" << symbol->candidate_datatypes.size()<< "]" << std::endl;

   481

	return NULL;

   482

}

   483

   484

// SYM_REF2(integer_literal_c, type, value)

   485

void *fill_candidate_datatypes_c::visit(integer_literal_c *symbol) {

   486

	symbol->value->accept(*this);

   487

	if (search_in_candidate_datatype_list(symbol->type, symbol->value->candidate_datatypes) >= 0)

   488

		symbol->candidate_datatypes.push_back(symbol->type);

   489

	if (debug) std::cout << "INT_LITERAL [" << symbol->candidate_datatypes.size() << "]\n";

   490

	return NULL;

   491

}

   492

   493

void *fill_candidate_datatypes_c::visit(real_literal_c *symbol) {

   494

	symbol->value->accept(*this);

   495

	if (search_in_candidate_datatype_list(symbol->type, symbol->value->candidate_datatypes) >= 0)

   496

		symbol->candidate_datatypes.push_back(symbol->type);

   497

	if (debug) std::cout << "REAL_LITERAL [" << symbol->candidate_datatypes.size() << "]\n";

   498

	return NULL;

   499

}

   500

   501

void *fill_candidate_datatypes_c::visit(bit_string_literal_c *symbol) {

   502

	symbol->value->accept(*this);

   503

	if (search_in_candidate_datatype_list(symbol->type, symbol->value->candidate_datatypes) >= 0)

   504

		symbol->candidate_datatypes.push_back(symbol->type);

   505

	return NULL;

   506

}

   507

   508

void *fill_candidate_datatypes_c::visit(boolean_literal_c *symbol) {

   509

 	symbol->value->accept(*this);

   510

 	if (search_in_candidate_datatype_list(symbol->type, symbol->value->candidate_datatypes) >= 0)

   511

		/* if an explicit datat type has been provided (e.g. SAFEBOOL#true), check whether