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) 20011-2012 Manuele Conti (manuele.conti@sirius-es.it)

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 *  Copyright (C) 20011-2012 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.

    17

 *

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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/>.

    20

 *

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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

 *

    29

 * 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

    35

/*

    36

 *  Fill candidate list of data types for all symbols

    37

 */

    38

    39

#include "print_datatypes_error.hh"

    40

#include "datatype_functions.hh"

    41

    42

#include <typeinfo>

    43

#include <list>

    44

#include <string>

    45

#include <string.h>

    46

#include <strings.h>

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    52

    53

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

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

    55

    56

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

    57

  if (current_display_error_level >= error_level) {                                                                         \

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

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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);\

    61

    fprintf(stderr, __VA_ARGS__);                                                                                           \

    62

    fprintf(stderr, "\n");                                                                                                  \

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    il_error = true;                                                                                                        \

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    error_found = true;                                                                                                     \

    65

  }                                                                                                                         \

    66

}  

    67

    68

    69

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

    70

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

    71

            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);\

    73

    fprintf(stderr, __VA_ARGS__);                                                                                           \

    74

    fprintf(stderr, "\n");                                                                                                  \

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    warning_found = true;                                                                                                   \

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}  

    77

    78

    79

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

    80

static int debug = 0;

    81

    82

print_datatypes_error_c::print_datatypes_error_c(symbol_c *ignore) {

    83

	error_found = false;

    84

	warning_found = false;

    85

	current_display_error_level = error_level_default;

    86

}

    87

    88

print_datatypes_error_c::~print_datatypes_error_c(void) {

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}

    90

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int print_datatypes_error_c::get_error_found() {

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	return error_found;

    93

}

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    95

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    98

    99

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

   100

static bool are_all_datatypes_of_prev_il_instructions_datatypes_equal(il_instruction_c *symbol) {

   101

	if (NULL == symbol) ERROR;

   102

	bool res;

   103

   104

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

   105

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

   106

   107

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

   108

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

   109

   110

	return res;

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}

   112

   113

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   115

   116

/* a helper function... */

   117

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

   118

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

   119

	 *       in the code.

   120

	 */

   121

	if (symbol == NULL) return NULL;

   122

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

   123

}

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   125

   126

   127

/*

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typedef struct {

   129

  symbol_c *function_name,

   130

  symbol_c *nonformal_operand_list,

   131

  symbol_c *   formal_operand_list,

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   133

  std::vector <symbol_c *> &candidate_functions,  

   134

  symbol_c &*called_function_declaration,

   135

  int      &extensible_param_count

   136

} generic_function_call_t;

   137

*/

   138

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

   139

	symbol_c *param_value, *param_name;

   140

	function_call_param_iterator_c fcp_iterator(fcall);

   141

	bool function_invocation_error = false;

   142

	const char *POU_str = NULL;

   143

   144

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

   145

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

   146

	if (NULL == POU_str) ERROR;

   147

   148

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

   149

		ERROR;

   150

   151

	symbol_c *f_decl = fcall_data.called_function_declaration;

   152

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

   153

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

   154

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

   155

		ERROR;

   156

	}

   157

	if (NULL == f_decl) {

   158

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

   159

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

   160

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

   161

		f_decl = function_symtable.get_value(lower);

   162

	}

   163

   164

	if (NULL != fcall_data.formal_operand_list) {

   165

		fcall_data.formal_operand_list->accept(*this);

   166

		if (NULL != f_decl) {

   167

			function_param_iterator_c fp_iterator(f_decl);

   168

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

   169

				param_value = fcp_iterator.get_current_value();

   170

   171

				/* Check if there are duplicate parameter values */

   172

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

   173

					function_invocation_error = true;

   174

					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);

   175

					continue; /* jump to next parameter */

   176

				}

   177

   178

				/* Find the corresponding parameter in function declaration */

   179

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

   180

					function_invocation_error = true;

   181

					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);

   182

					continue; /* jump to next parameter */

   183

				} 

   184

   185

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

   186

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

   187

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

   188

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

   189

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

   190

				if          (function_call_param_iterator_c::assign_in  == call_param_dir) {

   191

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

   192

					    (function_param_iterator_c::direction_inout != param_dir)) {

   193

						function_invocation_error = true;

   194

						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);

   195

						continue; /* jump to next parameter */

   196

					}

   197

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

   198

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

   199

						function_invocation_error = true;

   200

						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);

   201

						continue; /* jump to next parameter */

   202

					}

   203

				} else ERROR;

   204

   205

				if (NULL == param_value->datatype) {

   206

					function_invocation_error = true;

   207

					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);

   208

					continue; /* jump to next parameter */

   209

				}

   210

			}

   211

		}

   212

	}

   213

	if (NULL != fcall_data.nonformal_operand_list) {

   214

		fcall_data.nonformal_operand_list->accept(*this);

   215

		if (f_decl)

   216

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

   217

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

   218

   219

				if (NULL == param_value->datatype) {

   220

					function_invocation_error = true;

   221

					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);

   222

				}

   223

			}

   224

	}

   225

   226

	if (NULL == fcall_data.called_function_declaration) {

   227

		function_invocation_error = true;

   228

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

   229

	}

   230

   231

	if (function_invocation_error) {

   232

		/* No compatible function exists */

   233

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

   234

	} 

   235

   236

	return;

   237

}

   238

   239

   240

   241

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

   242

	if (NULL == il_operand) {

   243

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

   244

		return;

   245

	}

   246

	il_operand->accept(*this);

   247

   248

	if (NULL == called_fb_declaration) {

   249

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

   250

		return;

   251

	}

   252

   253

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

   254

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

   255

		return;

   256

	}

   257

   258

	/* Find the corresponding parameter in function declaration */

   259

	function_param_iterator_c fp_iterator(called_fb_declaration);

   260

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

   261

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

   262

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

   263

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

   264

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

   265

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

   266

		*        which will not work for an implicit FB call!

   267

		*/

   268

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

   269

		return;

   270

	}

   271

	if (!are_all_datatypes_of_prev_il_instructions_datatypes_equal(fake_prev_il_instruction)) {

   272

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

   273

		return;

   274

	}

   275

   276

   277

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

   278

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

   279

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

   280

	 *       be printed out!

   281

	 */

   282

	if (NULL == il_operand->datatype) {

   283

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

   284

// 		if (NULL != fb_declaration) {

   285

			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);

   286

			return;

   287

// 		}

   288

	}

   289

// 

   290

	return;

   291

}

   292

   293

   294

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

   295

/* B 1.2 - Constants */

   296

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

   297

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

   298

/* B 1.2.1 - Numeric Literals */

   299

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

   300

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

   301

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

   302

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

   303

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

   304

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

   305

	}

   306

	return NULL;

   307

}

   308

   309

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

   310

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

   311

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

   312

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

   313

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

   314

	}

   315

	return NULL;

   316

}

   317

   318

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

   319

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

   320

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

   321

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

   322

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

   323

	}

   324

	return NULL;

   325

}

   326

   327

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

   328

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

   329

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

   330

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

   331

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

   332

	}

   333

	return NULL;

   334

}

   335

   336

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

   337

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

   338

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

   339

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

   340

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

   341

	}

   342

	return NULL;

   343

}

   344

   345

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

   346

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

   347

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

   348

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

   349

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

   350

	}

   351

	return NULL;

   352

}

   353

   354

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

   355

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

   356

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

   357

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

   358

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

   359

	}

   360

	return NULL;

   361

}

   362

   363

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

   364

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

   365

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

   366

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

   367

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

   368

	}

   369

	return NULL;

   370

}

   371

   372

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

   373

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

   374

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

   375

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

   376

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

   377

	}

   378

	return NULL;

   379

}

   380

   381

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

   382

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

   383

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

   384

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

   385

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

   386

	}

   387

	return NULL;

   388

}

   389

   390

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

   391

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

   392

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

   393

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

   394

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

   395

	}

   396

	return NULL;

   397

}

   398

   399

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

   400

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

   401

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

   402

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

   403

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

   404

	}

   405

	return NULL;

   406

}

   407

   408

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

   409

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

   410

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

   411

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

   412

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

   413

	}

   414

	return NULL;

   415

}

   416

   417

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

   418

/* B.1.2.2   Character Strings */

   419

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

   420

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

   421

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

   422

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

   423

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

   424

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

   425

	}

   426

	return NULL;

   427

}

   428

   429

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

   430

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

   431

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

   432

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

   433

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

   434

	}

   435

	return NULL;

   436

}

   437

   438

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

   439

/* B 1.2.3 - Time Literals */

   440

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

   441

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

   442

/* B 1.2.3.1 - Duration */

   443

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

   444

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

   445

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

   446

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

   447

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

   448

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

   449

	}

   450

	return NULL;

   451

}

   452

   453

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

   454

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

   455

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

   456

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

   457

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

   458

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

   459

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

   460

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

   461

	}

   462

	return NULL;

   463

}

   464

   465

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

   466

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

   467

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

   468

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

   469

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

   470

	}

   471

	return NULL;

   472

}

   473

   474

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

   475

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

   476

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

   477

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

   478

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

   479

	}

   480

	return NULL;

   481

}

   482

   483

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

   484

/* B 1.3 - Data types */

   485

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

   486

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

   487

/* B 1.3.3 - Derived data types */

   488

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

   489

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

   490

	// TODO !!!

   491

	/* for the moment we must return NULL so semantic analysis of remaining code is not interrupted! */

   492

	return NULL;

   493

}

   494

   495

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

   496

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

   497

		STAGE3_ERROR(0, symbol, symbol, "Ambiguous enumerate value or Variable not declared in this scope.");

   498

	return NULL;

   499

}

   500

   501

   502

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

   503

/* B 1.4 - Variables */

   504

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

   505