1

/*

     2

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

     3

 *

     4

 *  Copyright (C) 2009-2011  Mario de Sousa (msousa@fe.up.pt)

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 *  Copyright (C) 2011-2012 Manuele Conti (manuele.conti@sirius-es.it)

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 *  Copyright (C) 2011-2012 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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 *

    13

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

    14

 *  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.

    17

 *

    18

 *  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/>.

    20

 *

    21

 *

    22

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

    23

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

    24

 */

    25

    26

/*

    27

 * An IEC 61131-3 compiler.

    28

 *

    29

 * Based on the

    30

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

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 *

    32

 */

    33

    34

/* NOTE: The algorithm implemented here assumes that the symbol_c.candidate_datatype, and the symbol_c.datatype 

    35

 *       annotations have already been apropriately filled in!

    36

 *       BEFORE running this visitor, be sure to CALL the fill_candidate_datatypes_c, and the narrow_candidate_datatypes_c visitors!

    37

 */

    38

    39

    40

/*

    41

 *  By analysing the candidate datatype lists, as well as the chosen datatype for each expression, determine

    42

 *  if an datatype error has been found, and if so, print out an error message.

    43

 */

    44

    45

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#include "print_datatypes_error.hh"

    47

#include "datatype_functions.hh"

    48

    49

#include <typeinfo>

    50

#include <list>

    51

#include <string>

    52

#include <string.h>

    53

#include <strings.h>

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    55

    56

    57

    58

    59

    60

#define FIRST_(symbol1, symbol2) (((symbol1)->first_order < (symbol2)->first_order)   ? (symbol1) : (symbol2))

    61

#define  LAST_(symbol1, symbol2) (((symbol1)->last_order  > (symbol2)->last_order)    ? (symbol1) : (symbol2))

    62

    63

#define STAGE3_ERROR(error_level, symbol1, symbol2, ...) {                                                                  \

    64

  if (current_display_error_level >= error_level) {                                                                         \

    65

    fprintf(stderr, "%s:%d-%d..%d-%d: error: ",                                                                             \

    66

            FIRST_(symbol1,symbol2)->first_file, FIRST_(symbol1,symbol2)->first_line, FIRST_(symbol1,symbol2)->first_column,\

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                                                 LAST_(symbol1,symbol2) ->last_line,  LAST_(symbol1,symbol2) ->last_column);\

    68

    fprintf(stderr, __VA_ARGS__);                                                                                           \

    69

    fprintf(stderr, "\n");                                                                                                  \

    70

    il_error = true;                                                                                                        \

    71

    error_count++;                                                                                                     \

    72

  }                                                                                                                         \

    73

}  

    74

    75

    76

#define STAGE3_WARNING(symbol1, symbol2, ...) {                                                                             \

    77

    fprintf(stderr, "%s:%d-%d..%d-%d: warning: ",                                                                           \

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            FIRST_(symbol1,symbol2)->first_file, FIRST_(symbol1,symbol2)->first_line, FIRST_(symbol1,symbol2)->first_column,\

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                                                 LAST_(symbol1,symbol2) ->last_line,  LAST_(symbol1,symbol2) ->last_column);\

    80

    fprintf(stderr, __VA_ARGS__);                                                                                           \

    81

    fprintf(stderr, "\n");                                                                                                  \

    82

    warning_found = true;                                                                                                   \

    83

}  

    84

    85

    86

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

    87

static int debug = 0;

    88

    89

print_datatypes_error_c::print_datatypes_error_c(symbol_c *ignore) {

    90

	error_count = 0;

    91

	warning_found = false;

    92

	current_display_error_level = error_level_default;

    93

}

    94

    95

print_datatypes_error_c::~print_datatypes_error_c(void) {

    96

}

    97

    98

int print_datatypes_error_c::get_error_count() {

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	return error_count;

   100

}

   101

   102

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/* Verify if the datatypes of all prev_il_instructions are valid and equal!  */

   107

static bool are_all_datatypes_of_prev_il_instructions_datatypes_equal(il_instruction_c *symbol) {

   108

	if (NULL == symbol) ERROR;

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	bool res;

   110

   111

	if (symbol->prev_il_instruction.size() > 0)

   112

		res = is_type_valid(symbol->prev_il_instruction[0]->datatype);

   113

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	for (unsigned int i = 1; i < symbol->prev_il_instruction.size(); i++)

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		res &= is_type_equal(symbol->prev_il_instruction[i-1]->datatype, symbol->prev_il_instruction[i]->datatype);

   116

   117

	return res;

   118

}

   119

   120

   121

   122

   123

/* a helper function... */

   124

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

   125

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

   126

	 *       in the code.

   127

	 */

   128

	if (symbol == NULL) return NULL;

   129

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

   130

}

   131

   132

   133

   134

/*

   135

typedef struct {

   136

  symbol_c *function_name,

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  symbol_c *nonformal_operand_list,

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  symbol_c *   formal_operand_list,

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   140

  std::vector <symbol_c *> &candidate_functions,  

   141

  symbol_c &*called_function_declaration,

   142

  int      &extensible_param_count

   143

} generic_function_call_t;

   144

*/

   145

void print_datatypes_error_c::handle_function_invocation(symbol_c *fcall, generic_function_call_t fcall_data) {

   146

	symbol_c *param_value, *param_name;

   147

	function_call_param_iterator_c fcp_iterator(fcall);

   148

	bool function_invocation_error = false;

   149

	const char *POU_str = NULL;

   150

   151

	if (generic_function_call_t::POU_FB       == fcall_data.POU_type)  POU_str = "FB";

   152

	if (generic_function_call_t::POU_function == fcall_data.POU_type)  POU_str = "function";

   153

	if (NULL == POU_str) ERROR;

   154

   155

	if ((NULL != fcall_data.formal_operand_list) && (NULL != fcall_data.nonformal_operand_list)) 

   156

		ERROR;

   157

   158

	symbol_c *f_decl = fcall_data.called_function_declaration;

   159

	if ((NULL == f_decl) && (generic_function_call_t::POU_FB ==fcall_data.POU_type)) {

   160

		/* Due to the way the syntax analysis is buit (i.e. stage 2), this should never occur. */

   161

		/* I.e., a FB invocation using an undefined FB variable is not possible in the current implementation of stage 2. */

   162

		ERROR;

   163

	}

   164

	if (NULL == f_decl) {

   165

		/* we now try to find any function declaration with the same name, just so we can provide some relevant error messages */

   166

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

   167

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

   168

		f_decl = function_symtable.get_value(lower);

   169

	}

   170

   171

	if (NULL != fcall_data.formal_operand_list) {

   172

		fcall_data.formal_operand_list->accept(*this);

   173

		if (NULL != f_decl) {

   174

			function_param_iterator_c fp_iterator(f_decl);

   175

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

   176

				param_value = fcp_iterator.get_current_value();

   177

   178

				/* Check if there are duplicate parameter values */

   179

				if(fcp_iterator.search_f(param_name) != param_value) {

   180

					function_invocation_error = true;

   181

					STAGE3_ERROR(0, param_name, param_name, "Duplicate parameter '%s' when invoking %s '%s'", ((identifier_c *)param_name)->value, POU_str, ((identifier_c *)fcall_data.function_name)->value);

   182

					continue; /* jump to next parameter */

   183

				}

   184

   185

				/* Find the corresponding parameter in function declaration */

   186

				if (NULL == fp_iterator.search(param_name)) {

   187

					function_invocation_error = true;

   188

					STAGE3_ERROR(0, param_name, param_name, "Invalid parameter '%s' when invoking %s '%s'", ((identifier_c *)param_name)->value, POU_str, ((identifier_c *)fcall_data.function_name)->value);

   189

					continue; /* jump to next parameter */

   190

				} 

   191

   192

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

   193

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

   194

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

   195

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

   196

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

   197

				if          (function_call_param_iterator_c::assign_in  == call_param_dir) {

   198

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

   199

					    (function_param_iterator_c::direction_inout != param_dir)) {

   200

						function_invocation_error = true;

   201

						STAGE3_ERROR(0, param_name, param_name, "Invalid assignment syntax ':=' used for parameter '%s', when invoking %s '%s'", ((identifier_c *)param_name)->value, POU_str, ((identifier_c *)fcall_data.function_name)->value);

   202

						continue; /* jump to next parameter */

   203

					}

   204

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

   205

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

   206

						function_invocation_error = true;

   207

						STAGE3_ERROR(0, param_name, param_name, "Invalid assignment syntax '=>' used for parameter '%s', when invoking %s '%s'", ((identifier_c *)param_name)->value, POU_str, ((identifier_c *)fcall_data.function_name)->value);

   208

						continue; /* jump to next parameter */

   209

					}

   210

				} else ERROR;

   211

   212

				if (NULL == param_value->datatype) {

   213

					function_invocation_error = true;

   214

					STAGE3_ERROR(0, param_value, param_value, "Data type incompatibility between parameter '%s' and value being passed, when invoking %s '%s'", ((identifier_c *)param_name)->value, POU_str, ((identifier_c *)fcall_data.function_name)->value);

   215

					continue; /* jump to next parameter */

   216

				}

   217

			}

   218

		}

   219

	}

   220

	if (NULL != fcall_data.nonformal_operand_list) {

   221

		fcall_data.nonformal_operand_list->accept(*this);

   222

		if (f_decl)

   223

			for (int i = 1; (param_value = fcp_iterator.next_nf()) != NULL; i++) {

   224

		  		/* TODO: verify if it is lvalue when INOUT or OUTPUT parameters! */

   225

   226

				/* This handle_function_invocation() will be called to handle IL function calls, where the first parameter comes from the previous IL instruction.

   227

				 * In this case, the previous IL instruction will be artifically (and temporarily) added to the begining ot the parameter list

   228

				 * so we (in this function) can handle this situation like all the other function calls.

   229

				 * However, 

   230

				 *     a) if NO previous IL function exists, then we get a fake previous IL function, with no location data (i.e. not found anywhere in the source code.

   231

				 *     b) the function call may actually have several prev IL instructions (if several JMP instructions jump directly to the il function call).

   232

				 * In order to handle these situations gracefully, we first check whether the first parameter is really an IL istruction!

   233

				 */

   234

				il_instruction_c *il_instruction_symbol = dynamic_cast<il_instruction_c *>(param_value);

   235

				if ((NULL != il_instruction_symbol) && (i == 1)) {

   236

					/* We are in a situation where an IL function call is passed the first parameter, which is actually the previous IL instruction */

   237

					/* However, this is really a fake previous il instruction (see visit(il_instruction_c *) )

   238

					 * We will iterate through all the real previous IL instructions, and analyse each of them one by one */

   239

					if (il_instruction_symbol->prev_il_instruction.size() == 0) {

   240

						function_invocation_error = true;

   241

						STAGE3_ERROR(0, fcall, fcall, "No available data to pass to first parameter of IL function %s. Missing a previous LD instruction?", ((identifier_c *)fcall_data.function_name)->value);

   242

					}

   243

#if 0

   244

					/* NOTE: We currently comment out this code...

   245

					 * This does not currently work, since the narrow operation is currently done on the intersection 

   246

					 * of all the previous IL instructions, so we currently either accept them all, or none at all.

   247

					 * In order to be able to produce these user freindly error messages, we will need to update the 

   248

					 * narrow algorithm. We leave this untill somebody aks for it...

   249

					 * So, for now, we simply comment out this code.

   250

					 */

   251

					for (unsigned int p = 0; p < il_instruction_symbol->prev_il_instruction.size(); p++) {

   252

						symbol_c *value = il_instruction_symbol->prev_il_instruction[p];  

   253

						if (!is_type_valid(value->datatype)) {

   254

							function_invocation_error = true;

   255

							STAGE3_ERROR(0, fcall, fcall, "Data type incompatibility for value passed to first parameter when invoking function '%s'", ((identifier_c *)fcall_data.function_name)->value);

   256

							STAGE3_ERROR(0, value, value, "This is the IL instruction producing the incompatible data type to first parameter of function '%s'", ((identifier_c *)fcall_data.function_name)->value);

   257

						}

   258

					}

   259

#else

   260

					if (!is_type_valid(il_instruction_symbol->datatype)) {

   261

						function_invocation_error = true;

   262

						STAGE3_ERROR(0, fcall, fcall, "Data type incompatibility between value in IL 'accumulator' and first parameter of function '%s'", ((identifier_c *)fcall_data.function_name)->value);

   263

					}

   264

#endif

   265

					if (function_invocation_error)

   266

						/* when handling a IL function call, and an error is found in the first parameter, then we bug out and do not print out any more error messages. */

   267

						return;

   268

				}

   269

				else if (!is_type_valid(param_value->datatype)) {

   270

					function_invocation_error = true;

   271

					STAGE3_ERROR(0, param_value, param_value, "Data type incompatibility for value passed in position %d when invoking %s '%s'", i, POU_str, ((identifier_c *)fcall_data.function_name)->value);

   272

				}

   273

			}

   274

	}

   275

   276

	if (NULL == fcall_data.called_function_declaration) {

   277

		function_invocation_error = true;

   278

		STAGE3_ERROR(0, fcall, fcall, "Unable to resolve which overloaded %s '%s' is being invoked.", POU_str, ((identifier_c *)fcall_data.function_name)->value);

   279

	}

   280

   281

	if (function_invocation_error) {

   282

		/* No compatible function exists */

   283

		STAGE3_ERROR(2, fcall, fcall, "Invalid parameters when invoking %s '%s'", POU_str, ((identifier_c *)fcall_data.function_name)->value);

   284

	} 

   285

   286

	return;

   287

}

   288

   289

   290

   291

void *print_datatypes_error_c::handle_implicit_il_fb_invocation(const char *param_name, symbol_c *il_operator, symbol_c *called_fb_declaration) {

   292

	if (NULL == il_operand) {

   293

		STAGE3_ERROR(0, il_operator, il_operator, "Missing operand for FB call operator '%s'.", param_name);

   294

		return NULL;

   295

	}

   296

	il_operand->accept(*this);

   297

   298

	if (NULL == called_fb_declaration) {

   299

		STAGE3_ERROR(0, il_operator, il_operand, "Invalid FB call: operand is not a FB instance.");

   300

		return NULL;

   301

	}

   302

   303

	if (fake_prev_il_instruction->prev_il_instruction.empty()) {

   304

		STAGE3_ERROR(0, il_operator, il_operand, "FB invocation operator '%s' must be preceded by a 'LD' (or equivalent) operator.", param_name);	

   305

		return NULL;

   306

	}

   307

   308

	/* Find the corresponding parameter in function declaration */

   309

	function_param_iterator_c fp_iterator(called_fb_declaration);

   310

	if (NULL == fp_iterator.search(param_name)) {

   311

		/* TODO: must also check whther it is an IN parameter!! */

   312

		/* NOTE: although all standard FBs have the implicit FB calls defined as input parameters

   313

		*        (i.e., for all standard FBs, CLK, PT, IN, CU, CD, S1, R1, etc... is always an input parameter)

   314

		*        if a non-standard (i.e. a FB not defined in the standard library) FB is being called, then

   315

		*        this (CLK, PT, IN, CU, ...) parameter may just have been defined as OUT or INOUT,

   316

		*        which will not work for an implicit FB call!

   317

		*/

   318

		STAGE3_ERROR(0, il_operator, il_operand, "FB called by '%s' operator does not have a parameter named '%s'", param_name, param_name);	

   319

		return NULL;

   320

	}

   321

	if (!are_all_datatypes_of_prev_il_instructions_datatypes_equal(fake_prev_il_instruction)) {

   322

		STAGE3_ERROR(0, il_operator, il_operand, "Data type incompatibility between parameter '%s' and value being passed.", param_name);

   323

		return NULL;

   324

	}

   325

   326

   327

	/* NOTE: The error_level currently being used for errors in variables/constants etc... is rather high.

   328

	 *       However, in the case of an implicit FB call, if the datatype of the operand == NULL, this may be

   329

	 *       the __only__ indication of an error! So we test it here again, to make sure thtis error will really

   330

	 *       be printed out!

   331

	 */

   332

	if (NULL == il_operand->datatype) {

   333

		/* Note: the case of (NULL == fb_declaration) was already caught above! */

   334

// 		if (NULL != fb_declaration) {

   335

			STAGE3_ERROR(0, il_operator, il_operator, "Invalid FB call: Datatype incompatibility between the FB's '%s' parameter and value being passed, or paramater '%s' is not a 'VAR_INPUT' parameter.", param_name, param_name);

   336

			return NULL;

   337

// 		}

   338

	}

   339

   340

	return NULL;

   341

}

   342

   343

   344

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

   345

/* B 1.2 - Constants */

   346

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

   347

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

   348

/* B 1.2.1 - Numeric Literals */

   349

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

   350

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

   351

	if (symbol->candidate_datatypes.size() == 0) {

   352

		STAGE3_ERROR(0, symbol, symbol, "Numerical value exceeds range for ANY_REAL data type.");

   353

	} else if (NULL == symbol->datatype) {

   354

		STAGE3_ERROR(4, symbol, symbol, "ANY_REAL data type not valid in this location.");

   355

	}

   356

	return NULL;

   357

}

   358

   359

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

   360

	if (symbol->candidate_datatypes.size() == 0) {

   361

		STAGE3_ERROR(0, symbol, symbol, "Numerical value exceeds range for ANY_INT data type.");

   362

	} else if (NULL == symbol->datatype) {

   363

		STAGE3_ERROR(4, symbol, symbol, "ANY_INT data type not valid in this location.");

   364

	}

   365

	return NULL;

   366

}

   367

   368

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

   369

	if (symbol->candidate_datatypes.size() == 0) {

   370

		STAGE3_ERROR(0, symbol, symbol, "Numerical value exceeds range for ANY_REAL data type.");

   371

	} else if (NULL == symbol->datatype) {

   372

		STAGE3_ERROR(4, symbol, symbol, "ANY_REAL data type not valid in this location.");

   373

	}

   374

	return NULL;

   375

}

   376

   377

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

   378

	if (symbol->candidate_datatypes.size() == 0) {

   379

		STAGE3_ERROR(0, symbol, symbol, "Numerical value exceeds range for ANY_INT data type.");

   380

	} else if (NULL == symbol->datatype) {

   381

		STAGE3_ERROR(4, symbol, symbol, "ANY_INT data type not valid in this location.");

   382

	}

   383

	return NULL;

   384

}

   385

   386

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

   387

	if (symbol->candidate_datatypes.size() == 0) {

   388

		STAGE3_ERROR(0, symbol, symbol, "Numerical value exceeds range for ANY_INT data type.");

   389

	} else if (NULL == symbol->datatype) {

   390

		STAGE3_ERROR(4, symbol, symbol, "ANY_INT data type not valid in this location.");

   391

	}

   392

	return NULL;

   393

}

   394

   395

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

   396

	if (symbol->candidate_datatypes.size() == 0) {

   397

		STAGE3_ERROR(0, symbol, symbol, "Numerical value exceeds range for ANY_INT data type.");

   398

	} else if (NULL == symbol->datatype) {

   399

		STAGE3_ERROR(4, symbol, symbol, "ANY_INT data type not valid in this location.");

   400

	}

   401

	return NULL;

   402

}

   403

   404

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

   405

	if (symbol->candidate_datatypes.size() == 0) {

   406

		STAGE3_ERROR(0, symbol, symbol, "Numerical value exceeds range for ANY_INT data type.");

   407

	} else if (NULL == symbol->datatype) {

   408

		STAGE3_ERROR(4, symbol, symbol, "ANY_INT data type not valid in this location.");

   409

	}

   410

	return NULL;

   411

}

   412

   413

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

   414

	if (symbol->candidate_datatypes.size() == 0) {

   415

		STAGE3_ERROR(0, symbol, symbol, "Numerical value exceeds range for %s data type.", elementary_type_c::to_string(symbol->type));

   416

	} else if (NULL == symbol->datatype) {

   417

		STAGE3_ERROR(4, symbol, symbol, "ANY_INT data type not valid in this location.");

   418

	}

   419

	return NULL;

   420

}

   421

   422

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

   423

	if (symbol->candidate_datatypes.size() == 0) {

   424

		STAGE3_ERROR(0, symbol, symbol, "Numerical value exceeds range for %s data type.", elementary_type_c::to_string(symbol->type));

   425

	} else if (NULL == symbol->datatype) {

   426

		STAGE3_ERROR(4, symbol, symbol, "ANY_REAL data type not valid in this location.");

   427

	}

   428

	return NULL;

   429

}

   430

   431

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

   432

	if (symbol->candidate_datatypes.size() == 0) {

   433

		STAGE3_ERROR(0, symbol, symbol, "Numerical value exceeds range for %s data type.", elementary_type_c::to_string(symbol->type));

   434

	} else if (NULL == symbol->datatype) {

   435

		STAGE3_ERROR(4, symbol, symbol, "ANY_BIT data type not valid in this location.");

   436

	}

   437

	return NULL;

   438

}

   439

   440

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

   441

	if (symbol->candidate_datatypes.size() == 0) {

   442

		STAGE3_ERROR(0, symbol, symbol, "Value is not valid for %s data type.", elementary_type_c::to_string(symbol->type));

   443

	} else if (NULL == symbol->datatype) {

   444

		STAGE3_ERROR(4, symbol, symbol, "ANY_BOOL data type not valid in this location.");

   445

	}

   446

	return NULL;

   447

}

   448

   449

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

   450

	if (symbol->candidate_datatypes.size() == 0) {

   451

		STAGE3_ERROR(0, symbol, symbol, "Value is not valid for ANY_BOOL data type.");

   452

	} else if (NULL == symbol->datatype) {

   453

		STAGE3_ERROR(4, symbol, symbol, "ANY_BOOL data type not valid in this location.");

   454

	}

   455

	return NULL;

   456

}

   457

   458

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

   459

	if (symbol->candidate_datatypes.size() == 0) {

   460

		STAGE3_ERROR(0, symbol, symbol, "Value is not valid for ANY_BOOL data type.");

   461

	} else if (NULL == symbol->datatype) {

   462

		STAGE3_ERROR(4, symbol, symbol, "ANY_BOOL data type not valid in this location.");

   463

	}

   464

	return NULL;

   465

}

   466

   467

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

   468

/* B.1.2.2   Character Strings */

   469

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

   470

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

   471

	if (symbol->candidate_datatypes.size() == 0) {

   472

		STAGE3_ERROR(0, symbol, symbol, "Numerical value exceeds range for WSTRING data type.");

   473

	} else if (NULL == symbol->datatype) {

   474

		STAGE3_ERROR(4, symbol, symbol, "WSTRING data type not valid in this location.");

   475

	}

   476

	return NULL;

   477

}

   478

   479

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

   480

	if (symbol->candidate_datatypes.size() == 0) {

   481

		STAGE3_ERROR(0, symbol, symbol, "Numerical value exceeds range for STRING data type.");

   482

	} else if (NULL == symbol->datatype) {

   483

		STAGE3_ERROR(4, symbol, symbol, "STRING data type not valid in this location.");

   484

	}

   485

	return NULL;

   486

}

   487

   488

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

   489

/* B 1.2.3 - Time Literals */

   490

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

   491

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

   492

/* B 1.2.3.1 - Duration */

   493

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

   494

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

   495

	if (symbol->candidate_datatypes.size() == 0) {

   496

		STAGE3_ERROR(0, symbol, symbol, "Invalid syntax for TIME data type.");

   497

	} else if (NULL == symbol->datatype) {

   498

		STAGE3_ERROR(4, symbol, symbol, "TIME data type not valid in this location.");

   499

	}

   500

	return NULL;