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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

     9

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

    10

 *  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

    19

 *  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.

    24

 */

    25

    26

/*

    27

 * An IEC 61131-3 compiler.

    28

 *

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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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 */

    38

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#include "fill_candidate_datatypes.hh"

    40

#include "datatype_functions.hh"

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#include <typeinfo>

    42

#include <list>

    43

#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;

    49

    50

fill_candidate_datatypes_c::fill_candidate_datatypes_c(symbol_c *ignore) {

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}

    52

    53

fill_candidate_datatypes_c::~fill_candidate_datatypes_c(void) {

    54

}

    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)))

    61

			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 */

    70

/*

    71

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

    72

 * 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_type;

    77

	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);

    80

	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.

    86

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

    87

		 */

    88

		do {

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			param_name = fp_iterator.next();

    90

			/* 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

    94

		/* Get the parameter type */

    95

		param_type = base_type(fp_iterator.param_type());

    96

    97

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

    98

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

    99

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

   100

	}

   101

	/* call is compatible! */

   102

	return true;

   103

}

   104

   105

   106

   107

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

   108

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

   109

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

   110

	symbol_c *call_param_value, *call_param_name, *param_type;

   111

	symbol_c *verify_duplicate_param;

   112

	identifier_c *param_name;

   113

	function_param_iterator_c       fp_iterator(f_decl);

   114

	function_call_param_iterator_c fcp_iterator(f_call);

   115

	int extensible_parameter_highest_index = -1;

   116

	identifier_c *extensible_parameter_name;

   117

	unsigned int i;

   118

   119

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

   120

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

   122

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

   123

		call_param_value = fcp_iterator.get_current_value();

   124

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

   125

		if (NULL == call_param_value) ERROR;

   126

   127

		/* Checking if there are duplicated parameter values */

   128

		verify_duplicate_param = fcp_iterator.search_f(call_param_name);

   129

		if(verify_duplicate_param != call_param_value)

   130

			return false;

   131

   132

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

   133

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

   134

   135

		/* Find the corresponding parameter in function declaration */

   136

		param_name = fp_iterator.search(call_param_name);

   137

		if(param_name == NULL) return false;

   138

		/* Get the parameter type */

   139

		param_type = base_type(fp_iterator.param_type());

   140

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

   141

		if (search_in_candidate_datatype_list(param_type, call_param_types) < 0)

   142

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

   143

	}

   144

	/* call is compatible! */

   145

	return true;

   146

}

   147

   148

   149

   150

   151

/* Handle a generic function call!

   152

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

   153

 * has already had all the candidate_datatype lists filled in!

   154

 *

   155

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

   156

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

   157

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

   158

 */

   159

/*

   160

typedef struct {

   161

  symbol_c *function_name,

   162

  symbol_c *nonformal_operand_list,

   163

  symbol_c *   formal_operand_list,

   164

   165

  std::vector <symbol_c *> &candidate_functions,  

   166

  symbol_c &*called_function_declaration,

   167

  int      &extensible_param_count

   168

} generic_function_call_t;

   169

*/

   170

/*

   171

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

   172

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

   173

                                                       std::vector <symbol_c *> *candidate_datatypes,

   174

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

   175

  */

   176

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

   177

	function_declaration_c *f_decl;

   178

	list_c *parameter_list;

   179

	list_c *parameter_candidate_datatypes;

   180

	symbol_c *returned_parameter_type;

   181

   182

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

   183

   184

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

   185

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

   186

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

   187

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

   188

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

   189

   190

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

   191

	 * to the candidate_datatype list of this function invocation. 

   192

	 *

   193

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

   194

	 * even if the parameters passed to it are invalid.

   195

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

   196

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

   197

	 * spurious error messages.

   198

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

   199

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

   200

	 * compilation is aborted in stage3 (in print_datatypes_error_c).

   201

	 */

   202

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

   203

		f_decl = function_symtable.get_value(lower);

   204

		returned_parameter_type = base_type(f_decl->type_name);

   205

		fcall_data.candidate_functions.push_back(f_decl);

   206

		fcall->    candidate_datatypes.push_back(returned_parameter_type);

   207

	}

   208

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

   209

		bool compatible = false;

   210

   211

		f_decl = function_symtable.get_value(lower);

   212

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

   213

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

   214

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

   215

		if (compatible) {

   216

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

   217

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

   218

			 */

   219

			/* TODO

   220

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

   221

			 * instead of using for loop!

   222

			 */

   223

			unsigned int k;

   224

			returned_parameter_type = base_type(f_decl->type_name);

   225

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

   226

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

   227

					break;

   228

			}

   229

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

   230

				fcall->    candidate_datatypes.push_back(returned_parameter_type);

   231

				fcall_data.candidate_functions.push_back(f_decl);

   232

			}

   233

		}

   234

	}

   235

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

   236

	return;

   237

}

   238

   239

   240

/* handle implicit FB call in IL.

   242

 *        CU counter_var

   243

 *

   244

 * The algorithm will be to build a fake il_fb_call_c equivalent to the implicit IL FB call, and let 

   245

 * the visit(il_fb_call_c *) method handle it!

   246

 */

   247

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

   252

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

   253

	/* This is a call to a non-declared FB/Variable is a semantic error (which is currently caught by stage 2, so this should never occur)

   254

	 * or no operand was given (il_operand == NULL). In this case, we just give up!

   255

	 */

   256

	if (NULL == fb_type_id)

   257

		return;

   258

   259

	function_block_declaration_c *fb_decl = function_block_type_symtable.find_value(fb_type_id);

   260

	if (function_block_type_symtable.end_value() == fb_decl)

   261

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

   262

		 * this is a smeantic error, so there is no way we can evaluate the rest of the code. We simply give up, and leave

   263

		 * the candidate_datatype_list empty, and the called_fb_declaration pointing to NULL

   264

		 */

   265

		return;

   266

   274

   275

	identifier_c variable_name(param_name);

   276

	// SYM_REF1(il_assign_operator_c, variable_name)

   277

	il_assign_operator_c il_assign_operator(&variable_name);  

   278

	// SYM_REF3(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list)

   279

	il_param_assignment_c il_param_assignment(&il_assign_operator, prev_il_instruction/*il_operand*/, NULL);

   280

	il_param_list_c il_param_list;

   281

	il_param_list.add_element(&il_param_assignment);

   282

	// SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list, symbol_c *called_fb_declaration)

   283

	il_fb_call_c il_fb_call(NULL, il_operand, NULL, &il_param_list);

   284

   285

	il_fb_call.accept(*this);

   286

	copy_candidate_datatype_list(&il_fb_call/*from*/, il_instruction/*to*/);

   287

	called_fb_declaration = il_fb_call.called_fb_declaration;

   288

}

   289

   290

   291

/* a helper function... */

   292

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

   293

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

   294

	 *       in the code.

   295

	 */

   296

	if (symbol == NULL) return NULL;

   297

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

   298

}

   299

   300

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

   301

/* B 1.2 - Constants */

   302

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

   303

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

   304

/* B 1.2.1 - Numeric Literals */

   305

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

   306

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

   307

	int calc_size;

   308

   309

	calc_size = sizeoftype(symbol);

   310

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

   311

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

   312

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

   313

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

   314

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

   315

	return NULL;

   316

}

   317

   318

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

   319

	int calc_size;

   320

   321

	calc_size = sizeoftype(symbol);

   322

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

   323

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

   324

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

   325

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

   326

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

   327

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

   328

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

   329

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

   330

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

   331

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

   332

   333

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

   334

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

   335

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

   336

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

   337

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

   338

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

   339

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

   340

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

   341

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

   342

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

   343

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

   344

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

   345

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

   346

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

   347

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

   348

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

   349

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

   350

	return NULL;

   351

}

   352

   353

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

   354

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

   355

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

   356

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

   357

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

   358

	return NULL;

   359

}

   360

   361

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

   362

	int calc_size;

   363

   364

	calc_size = sizeoftype(symbol);

   365

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

   366

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

   367

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

   368

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

   369

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

   370

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

   371

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

   372

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

   373

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

   374

	return NULL;

   375

}

   376

   377

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

   378

	int calc_size;

   379

   380

	calc_size = sizeoftype(symbol);

   381

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

   382

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

   383

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

   384

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

   385

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

   386

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

   387

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

   388

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

   389

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

   390

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

   391

   392

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

   393

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

   394

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

   395

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

   396

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

   397

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

   398

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

   399

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

   400

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

   401

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

   402

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

   403

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

   404

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

   405

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

   406

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

   407

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

   408

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

   409

	return NULL;

   410

}

   411

   412

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

   413

	int calc_size;

   414

   415

	calc_size = sizeoftype(symbol);

   416

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

   417

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

   418

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

   419

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

   420

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

   421

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

   422

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

   423

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

   424

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

   425

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

   426

   427

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

   428

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

   429

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

   430

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

   431

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

   432

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

   433

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

   434

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

   435

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

   436

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

   437

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

   438

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

   439

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

   440

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

   441

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

   442

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

   443

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

   444

	return NULL;

   445

}

   446

   447

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

   448

	int calc_size;

   449

   450

	calc_size = sizeoftype(symbol);

   451

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

   452

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

   453

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

   454

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

   455

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

   456

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

   457

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

   458

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

   459

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

   460

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

   461

   462

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

   463

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

   464

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

   465

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

   466

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

   467

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

   468

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

   469

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

   470

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

   471

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

   472

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

   473

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

   474

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

   475

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

   476

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

   477

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

   478

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

   479

	return NULL;

   480

}

   481

   482

// SYM_REF2(integer_literal_c, type, value)

   483

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

   484

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

   485

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

   486

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

   487

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

   488

	return NULL;

   489

}

   490

   491

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

   492

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

   493

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

   494

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

   495

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

   496

	return NULL;

   497

}

   498

   499

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

   500

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

   501

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

   502

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

   503

	return NULL;

   504

}

   505

   506

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

   507

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

   508

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

   509

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

   510

		 * the possible datatypes of the value is consistent with the desired type.

   511

		 */

   512

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

   513