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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

    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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 */

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    39

#include "fill_candidate_datatypes.hh"

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#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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}

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    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);

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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.

    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 */

    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) {

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	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) {

   121

   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 */

   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,

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                                                       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

   241

   242

   243

/* a helper function... */

   244

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

   245

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

   246

	 *       in the code.

   247

	 */

   248

	if (symbol == NULL) return NULL;

   249

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

   250

}

   251

   252

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

   253

/* B 1.2 - Constants */

   254

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

   255

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

   256

/* B 1.2.1 - Numeric Literals */

   257

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

   258

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

   259

	int calc_size;

   260

   261

	calc_size = sizeoftype(symbol);

   262

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

   263

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

   264

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

   265

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

   266

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

   267

	return NULL;

   268

}

   269

   270

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

   271

	int calc_size;

   272

   273

	calc_size = sizeoftype(symbol);

   274

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

   275

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

   276

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

   277

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

   278

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

   279

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

   280

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

   281

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

   282

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

   283

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

   284

   285

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

   286

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

   287

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

   288

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

   289

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

   290

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

   291

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

   292

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

   293

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

   294

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

   295

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

   296

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

   297

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

   298

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

   299

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

   300

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

   301

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

   302

	return NULL;

   303

}

   304

   305

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

   306

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

   307

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

   308

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

   309

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

   310

	return NULL;

   311

}

   312

   313

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

   314

	int calc_size;

   315

   316

	calc_size = sizeoftype(symbol);

   317

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

   318

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

   319

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

   320

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

   321

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

   322

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

   323

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

   324

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

   325

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

   326

	return NULL;

   327

}

   328

   329

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

   330

	int calc_size;

   331

   332

	calc_size = sizeoftype(symbol);

   333

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

   334

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

   335

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

   336

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

   337

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

   338

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

   339

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

   340

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

   341

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

   342

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

   343

   344

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

   345

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

   346

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

   347

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

   348

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

   349

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

   350

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

   351

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

   352

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

   353

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

   354

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

   355

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

   356

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

   357

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

   358

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

   359

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

   360

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

   361

	return NULL;

   362

}

   363

   364

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

   365

	int calc_size;

   366

   367

	calc_size = sizeoftype(symbol);

   368

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

   369

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

   370

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

   371

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

   372

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

   373

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

   374

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

   375

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

   376

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

   377

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

   378

   379

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

   380

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

   381

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

   382

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

   383

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

   384

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

   385

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

   386

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

   387

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

   388

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

   389

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

   390

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

   391

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

   392

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

   393

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

   394

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

   395

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

   396

	return NULL;

   397

}

   398

   399

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

   400

	int calc_size;

   401

   402

	calc_size = sizeoftype(symbol);

   403

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

   404

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

   405

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

   406

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

   407

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

   408

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

   409

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

   410

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

   411

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

   412

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

   413

   414

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

   415

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

   416

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

   417

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

   418

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

   419

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

   420

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

   421

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

   422

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

   423

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

   424

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

   425

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

   426

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

   427

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

   428

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

   429

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

   430

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

   431

	return NULL;

   432

}

   433

   434

// SYM_REF2(integer_literal_c, type, value)

   435

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

   436

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

   438

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

   439

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

   440

	return NULL;

   441

}

   442

   443

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

   444

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

   446

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

   447

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

   448

	return NULL;

   449

}

   450

   451

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

   452

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

   454

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

   455

	return NULL;

   456

}

   457

   458

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

   459

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

   461

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

   462

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

   463

		 */

   464

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

   465

	else {

   466

		/* Then only a literal TRUE or FALSE was given! */

   467

		/* In this case, symbol->type will be NULL!     */

   468

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

   469

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

   470

	}

   471

	return NULL;

   472

}

   473

   474

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

   475

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

   476

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

   477

	return NULL;

   478

}

   479

   480

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

   481

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

   482

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

   483

	return NULL;

   484

}

   485

   486

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

   487

/* B.1.2.2   Character Strings */

   488

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

   489

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

   490

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

   491

	return NULL;

   492

}

   493

   494

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

   495

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

   496

	return NULL;

   497

}

   498

   499

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

   500

/* B 1.2.3 - Time Literals */

   501

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

   502

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

   503

/* B 1.2.3.1 - Duration */

   504

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

   505

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

   506

	/* TODO: check whether the literal follows the rules specified in section '2.2.3.1 Duration' of the standard! */

   507

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

   508

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

   509

	return NULL;

   510

}

   511

   512

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

   513

/* B 1.2.3.2 - Time of day and Date */

   514

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

   515

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