mcs/mcs/report.cs

   1 //
   2 // report.cs: report errors and warnings.
   3 //
   4 // Author: Miguel de Icaza (miguel@ximian.com)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // (C) 2001 Ximian, Inc. (http://www.ximian.com)
   8 //
   9
  10 using System;
  11 using System.IO;
  12 using System.Text;
  13 using System.Collections;
  14 using System.Collections.Specialized;
  15 using System.Diagnostics;
  16 using System.Reflection;
  17 using System.Reflection.Emit;
  18
  19 namespace Mono.CSharp {
  20
  21         /// <summary>
  22         ///   This class is used to report errors and warnings t te user.
  23         /// </summary>
  24         public class Report {
  25                 /// <summary>
  26                 ///   Errors encountered so far
  27                 /// </summary>
  28                 static public int Errors;
  29
  30                 /// <summary>
  31                 ///   Warnings encountered so far
  32                 /// </summary>
  33                 static public int Warnings;
  34
  35                 /// <summary>
  36                 ///   Whether errors should be throw an exception
  37                 /// </summary>
  38                 static public bool Fatal;
  39
  40                 /// <summary>
  41                 ///   Whether warnings should be considered errors
  42                 /// </summary>
  43                 static public bool WarningsAreErrors;
  44
  45                 /// <summary>
  46                 ///   Whether to dump a stack trace on errors.
  47                 /// </summary>
  48                 static public bool Stacktrace;
  49
  50                 static public TextWriter Stderr = Console.Error;
  51
  52                 //
  53                 // If the 'expected' error code is reported then the
  54                 // compilation succeeds.
  55                 //
  56                 // Used for the test suite to excercise the error codes
  57                 //
  58                 static int expected_error = 0;
  59
  60                 //
  61                 // Keeps track of the warnings that we are ignoring
  62                 //
  63                 public static Hashtable warning_ignore_table;
  64
  65                 static Hashtable warning_regions_table;
  66
  67                 /// <summary>
  68                 /// List of symbols related to reported error/warning. You have to fill it before error/warning is reported.
  69                 /// </summary>
  70                 static StringCollection extra_information = new StringCollection ();
  71
  72                 //
  73                 // IF YOU ADD A NEW WARNING YOU HAVE TO ADD ITS ID HERE
  74                 //
  75                 public static readonly int[] AllWarnings = new int[] {
  76                         28, 67, 78,
  77                         105, 108, 109, 114, 162, 164, 168, 169, 183, 184, 197,
  78                         219, 251, 252, 253, 278, 282,
  79                         419, 420, 429, 436, 440, 465, 467, 469,
  80                         612, 618, 626, 628, 642, 649, 652, 658, 659, 660, 661, 665, 672, 675,
  81                         809,
  82                         1030,
  83                         1522, 1570, 1571, 1572, 1573, 1574, 1580, 1581, 1584, 1587, 1589, 1590, 1591, 1592,
  84                         1616, 1633, 1634, 1635, 1685, 1690, 1691, 1692,
  85                         1717, 1718, 1720,
  86                         1901,
  87                         2002, 2023,
  88                         3005, 3012, 3018, 3019, 3021, 3022, 3023, 3026, 3027,
  89 #if GMCS_SOURCE
  90                         402, 414, 693, 1058, 1700, 3024
  91 #endif
  92                 };
  93
  94                 static Report ()
  95                 {
  96                         // Just to be sure that binary search is working
  97                         Array.Sort (AllWarnings);
  98                 }
  99
 100                 public static void Reset ()
 101                 {
 102                         Errors = Warnings = 0;
 103                         WarningsAreErrors = false;
 104                         warning_ignore_table = null;
 105                         warning_regions_table = null;
 106                 }
 107
 108                 abstract class AbstractMessage {
 109
 110                         static void Check (int code)
 111                         {
 112                                 if (code == expected_error) {
 113                                         Environment.Exit (0);
 114                                 }
 115                         }
 116
 117                         public abstract bool IsWarning { get; }
 118
 119                         public abstract string MessageType { get; }
 120
 121                         public virtual void Print (int code, string location, string text)
 122                         {
 123                                 if (code < 0)
 124                                         code = 8000-code;
 125
 126                                 StringBuilder msg = new StringBuilder ();
 127                                 if (location.Length != 0) {
 128                                         msg.Append (location);
 129                                         msg.Append (' ');
 130                                 }
 131                                 msg.AppendFormat ("{0} CS{1:0000}: {2}", MessageType, code, text);
 132                                 Stderr.WriteLine (msg.ToString ());
 133
 134                                 foreach (string s in extra_information)
 135                                         Stderr.WriteLine (s + MessageType + ")");
 136
 137                                 extra_information.Clear ();
 138
 139                                 if (Stacktrace)
 140                                         Console.WriteLine (FriendlyStackTrace (new StackTrace (true)));
 141
 142                                 if (Fatal) {
 143                                         if (!IsWarning || WarningsAreErrors)
 144                                                 throw new Exception (text);
 145                                 }
 146
 147                                 Check (code);
 148                         }
 149
 150                         public virtual void Print (int code, Location location, string text)
 151                         {
 152                                 Print (code, location.IsNull ? "" : location.ToString (), text);
 153                         }
 154                 }
 155
 156                 sealed class WarningMessage : AbstractMessage {
 157                         Location loc = Location.Null;
 158                         readonly int Level;
 159
 160                         public WarningMessage (int level)
 161                         {
 162                                 Level = level;
 163                         }
 164
 165                         public override bool IsWarning {
 166                                 get { return true; }
 167                         }
 168
 169                         bool IsEnabled (int code)
 170                         {
 171                                 if (RootContext.WarningLevel < Level)
 172                                         return false;
 173
 174                                 if (warning_ignore_table != null) {
 175                                         if (warning_ignore_table.Contains (code)) {
 176                                                 return false;
 177                                         }
 178                                 }
 179
 180                                 if (warning_regions_table == null || loc.Equals (Location.Null))
 181                                         return true;
 182
 183                                 WarningRegions regions = (WarningRegions)warning_regions_table [loc.Name];
 184                                 if (regions == null)
 185                                         return true;
 186
 187                                 return regions.IsWarningEnabled (code, loc.Row);
 188                         }
 189
 190                         public override void Print(int code, string location, string text)
 191                         {
 192                                 if (!IsEnabled (code)) {
 193                                         extra_information.Clear ();
 194                                         return;
 195                                 }
 196
 197                                 if (WarningsAreErrors) {
 198                                         new ErrorMessage ().Print (code, location, text);
 199                                         return;
 200                                 }
 201
 202                                 Warnings++;
 203                                 base.Print (code, location, text);
 204                         }
 205
 206                         public override void Print(int code, Location location, string text)
 207                         {
 208                                 loc = location;
 209                                 base.Print (code, location, text);
 210                         }
 211
 212                         public override string MessageType {
 213                                 get {
 214                                         return "warning";
 215                                 }
 216                         }
 217                 }
 218
 219                 sealed class ErrorMessage : AbstractMessage {
 220
 221                         public override void Print(int code, string location, string text)
 222                         {
 223                                 Errors++;
 224                                 base.Print (code, location, text);
 225                         }
 226
 227                         public override bool IsWarning {
 228                                 get { return false; }
 229                         }
 230
 231                         public override string MessageType {
 232                                 get {
 233                                         return "error";
 234                                 }
 235                         }
 236
 237                 }
 238
 239                 public static void FeatureIsNotISO1 (Location loc, string feature)
 240                 {
 241                         Report.Error (1644, loc,
 242                                 "Feature `{0}' cannot be used because it is not part of the C# 1.0 language specification",
 243                                       feature);
 244                 }
 245
 246                 public static void FeatureRequiresLINQ (Location loc, string feature)
 247                 {
 248                         Report.Error (1644, loc,
 249                                       "Feature `{0}' can only be used if the language level is LINQ", feature);
 250                 }
 251
 252                 public static string FriendlyStackTrace (Exception e)
 253                 {
 254                         return FriendlyStackTrace (new StackTrace (e, true));
 255                 }
 256
 257                 static string FriendlyStackTrace (StackTrace t)
 258                 {
 259                         StringBuilder sb = new StringBuilder ();
 260
 261                         bool foundUserCode = false;
 262
 263                         for (int i = 0; i < t.FrameCount; i++) {
 264                                 StackFrame f = t.GetFrame (i);
 265                                 MethodBase mb = f.GetMethod ();
 266
 267                                 if (!foundUserCode && mb.ReflectedType == typeof (Report))
 268                                         continue;
 269
 270                                 foundUserCode = true;
 271
 272                                 sb.Append ("\tin ");
 273
 274                                 if (f.GetFileLineNumber () > 0)
 275                                         sb.AppendFormat ("(at {0}:{1}) ", f.GetFileName (), f.GetFileLineNumber ());
 276
 277                                 sb.AppendFormat ("{0}.{1} (", mb.ReflectedType.Name, mb.Name);
 278
 279                                 bool first = true;
 280                                 foreach (ParameterInfo pi in mb.GetParameters ()) {
 281                                         if (!first)
 282                                                 sb.Append (", ");
 283                                         first = false;
 284
 285                                         sb.Append (TypeManager.CSharpName (pi.ParameterType));
 286                                 }
 287                                 sb.Append (")\n");
 288                         }
 289
 290                         return sb.ToString ();
 291                 }
 292
 293                 public static void StackTrace ()
 294                 {
 295                         Console.WriteLine (FriendlyStackTrace (new StackTrace (true)));
 296                 }
 297
 298                 public static bool IsValidWarning (int code)
 299                 {
 300                         return Array.BinarySearch (AllWarnings, code) >= 0;
 301                 }
 302
 303                 static public void RuntimeMissingSupport (Location loc, string feature)
 304                 {
 305                         Report.Error (-88, loc, "Your .NET Runtime does not support `{0}'. Please use the latest Mono runtime instead.", feature);
 306                 }
 307
 308                 /// <summary>
 309                 /// In most error cases is very useful to have information about symbol that caused the error.
 310                 /// Call this method before you call Report.Error when it makes sense.
 311                 /// </summary>
 312                 static public void SymbolRelatedToPreviousError (Location loc, string symbol)
 313                 {
 314                         SymbolRelatedToPreviousError (loc.ToString (), symbol);
 315                 }
 316
 317                 static public void SymbolRelatedToPreviousError (MemberInfo mi)
 318                 {
 319                         Type dt = TypeManager.DropGenericTypeArguments (mi.DeclaringType);
 320                         DeclSpace temp_ds = TypeManager.LookupDeclSpace (dt);
 321                         if (temp_ds == null) {
 322                                 SymbolRelatedToPreviousError (dt.Assembly.Location, TypeManager.GetFullNameSignature (mi));
 323                         } else {
 324                                 MethodBase mb = mi as MethodBase;
 325                                 if (mb != null) {
 326                                         mb = TypeManager.DropGenericMethodArguments (mb);
 327                                         IMethodData md = TypeManager.GetMethod (mb);
 328                                         SymbolRelatedToPreviousError (md.Location, md.GetSignatureForError ());
 329                                         return;
 330                                 }
 331
 332                                 MemberCore mc = temp_ds.GetDefinition (mi.Name);
 333                                 SymbolRelatedToPreviousError (mc);
 334                         }
 335                 }
 336
 337                 static public void SymbolRelatedToPreviousError (MemberCore mc)
 338                 {
 339                         SymbolRelatedToPreviousError (mc.Location, mc.GetSignatureForError ());
 340                 }
 341
 342                 static public void SymbolRelatedToPreviousError (Type type)
 343                 {
 344                         type = TypeManager.DropGenericTypeArguments (type);
 345
 346                         if (TypeManager.IsGenericParameter (type)) {
 347                                 TypeParameter tp = TypeManager.LookupTypeParameter (type);
 348                                 if (tp != null) {
 349                                         SymbolRelatedToPreviousError (tp.Location, "");
 350                                         return;
 351                                 }
 352                         }
 353
 354                         if (type is TypeBuilder) {
 355                                 DeclSpace temp_ds = TypeManager.LookupDeclSpace (type);
 356                                 SymbolRelatedToPreviousError (temp_ds.Location, TypeManager.CSharpName (type));
 357                         } else if (type.HasElementType) {
 358                                 SymbolRelatedToPreviousError (type.GetElementType ());
 359                         } else {
 360                                 SymbolRelatedToPreviousError (type.Assembly.Location, TypeManager.CSharpName (type));
 361                         }
 362                 }
 363
 364                 static void SymbolRelatedToPreviousError (string loc, string symbol)
 365                 {
 366                         extra_information.Add (String.Format ("{0} (Location of the symbol related to previous ", loc));
 367                 }
 368
 369                 public static void ExtraInformation (Location loc, string msg)
 370                 {
 371                         extra_information.Add (String.Format ("{0} {1}", loc, msg));
 372                 }
 373
 374                 public static WarningRegions RegisterWarningRegion (Location location)
 375                 {
 376                         if (warning_regions_table == null)
 377                                 warning_regions_table = new Hashtable ();
 378
 379                         WarningRegions regions = (WarningRegions)warning_regions_table [location.Name];
 380                         if (regions == null) {
 381                                 regions = new WarningRegions ();
 382                                 warning_regions_table.Add (location.Name, regions);
 383                         }
 384                         return regions;
 385                 }
 386
 387                 static public void Warning (int code, int level, Location loc, string message)
 388                 {
 389                         WarningMessage w = new WarningMessage (level);
 390                         w.Print (code, loc, message);
 391                 }
 392
 393                 static public void Warning (int code, int level, Location loc, string format, string arg)
 394                 {
 395                         WarningMessage w = new WarningMessage (level);
 396                         w.Print (code, loc, String.Format (format, arg));
 397                 }
 398
 399                 static public void Warning (int code, int level, Location loc, string format, string arg1, string arg2)
 400                 {
 401                         WarningMessage w = new WarningMessage (level);
 402                         w.Print (code, loc, String.Format (format, arg1, arg2));
 403                 }
 404
 405                 static public void Warning (int code, int level, Location loc, string format, params string[] args)
 406                 {
 407                         WarningMessage w = new WarningMessage (level);
 408                         w.Print (code, loc, String.Format (format, args));
 409                 }
 410
 411                 static public void Warning (int code, int level, string message)
 412                 {
 413                         Warning (code, level, Location.Null, message);
 414                 }
 415
 416                 static public void Warning (int code, int level, string format, string arg)
 417                 {
 418                         Warning (code, level, Location.Null, format, arg);
 419                 }
 420
 421                 static public void Warning (int code, int level, string format, string arg1, string arg2)
 422                 {
 423                         Warning (code, level, Location.Null, format, arg1, arg2);
 424                 }
 425
 426                 static public void Warning (int code, int level, string format, params string[] args)
 427                 {
 428                         Warning (code, level, Location.Null, String.Format (format, args));
 429                 }
 430
 431                 static public void Error (int code, Location loc, string error)
 432                 {
 433                         new ErrorMessage ().Print (code, loc, error);
 434                 }
 435
 436                 static public void Error (int code, Location loc, string format, string arg)
 437                 {
 438                         new ErrorMessage ().Print (code, loc, String.Format (format, arg));
 439                 }
 440
 441                 static public void Error (int code, Location loc, string format, string arg1, string arg2)
 442                 {
 443                         new ErrorMessage ().Print (code, loc, String.Format (format, arg1, arg2));
 444                 }
 445
 446                 static public void Error (int code, Location loc, string format, params string[] args)
 447                 {
 448                         Error (code, loc, String.Format (format, args));
 449                 }
 450
 451                 static public void Error (int code, string error)
 452                 {
 453                         Error (code, Location.Null, error);
 454                 }
 455
 456                 static public void Error (int code, string format, string arg)
 457                 {
 458                         Error (code, Location.Null, format, arg);
 459                 }
 460
 461                 static public void Error (int code, string format, string arg1, string arg2)
 462                 {
 463                         Error (code, Location.Null, format, arg1, arg2);
 464                 }
 465
 466                 static public void Error (int code, string format, params string[] args)
 467                 {
 468                         Error (code, Location.Null, String.Format (format, args));
 469                 }
 470
 471                 static public void SetIgnoreWarning (int code)
 472                 {
 473                         if (warning_ignore_table == null)
 474                                 warning_ignore_table = new Hashtable ();
 475
 476                         warning_ignore_table [code] = true;
 477                 }
 478
 479                 static public int ExpectedError {
 480                         set {
 481                                 expected_error = value;
 482                         }
 483                         get {
 484                                 return expected_error;
 485                         }
 486                 }
 487
 488                 public static int DebugFlags = 0;
 489
 490                 [Conditional ("MCS_DEBUG")]
 491                 static public void Debug (string message, params object[] args)
 492                 {
 493                         Debug (4, message, args);
 494                 }
 495
 496                 [Conditional ("MCS_DEBUG")]
 497                 static public void Debug (int category, string message, params object[] args)
 498                 {
 499                         if ((category & DebugFlags) == 0)
 500                                 return;
 501
 502                         StringBuilder sb = new StringBuilder (message);
 503
 504                         if ((args != null) && (args.Length > 0)) {
 505                                 sb.Append (": ");
 506
 507                                 bool first = true;
 508                                 foreach (object arg in args) {
 509                                         if (first)
 510                                                 first = false;
 511                                         else
 512                                                 sb.Append (", ");
 513                                         if (arg == null)
 514                                                 sb.Append ("null");
 515                                         else if (arg is ICollection)
 516                                                 sb.Append (PrintCollection ((ICollection) arg));
 517                                         else
 518                                                 sb.Append (arg);
 519                                 }
 520                         }
 521
 522                         Console.WriteLine (sb.ToString ());
 523                 }
 524
 525                 static public string PrintCollection (ICollection collection)
 526                 {
 527                         StringBuilder sb = new StringBuilder ();
 528
 529                         sb.Append (collection.GetType ());
 530                         sb.Append ("(");
 531
 532                         bool first = true;
 533                         foreach (object o in collection) {
 534                                 if (first)
 535                                         first = false;
 536                                 else
 537                                         sb.Append (", ");
 538                                 sb.Append (o);
 539                         }
 540
 541                         sb.Append (")");
 542                         return sb.ToString ();
 543                 }
 544         }
 545
 546         public enum TimerType {
 547                 FindMembers     = 0,
 548                 TcFindMembers   = 1,
 549                 MemberLookup    = 2,
 550                 CachedLookup    = 3,
 551                 CacheInit       = 4,
 552                 MiscTimer       = 5,
 553                 CountTimers     = 6
 554         }
 555
 556         public enum CounterType {
 557                 FindMembers     = 0,
 558                 MemberCache     = 1,
 559                 MiscCounter     = 2,
 560                 CountCounters   = 3
 561         }
 562
 563         public class Timer
 564         {
 565                 static DateTime[] timer_start;
 566                 static TimeSpan[] timers;
 567                 static long[] timer_counters;
 568                 static long[] counters;
 569
 570                 static Timer ()
 571                 {
 572                         timer_start = new DateTime [(int) TimerType.CountTimers];
 573                         timers = new TimeSpan [(int) TimerType.CountTimers];
 574                         timer_counters = new long [(int) TimerType.CountTimers];
 575                         counters = new long [(int) CounterType.CountCounters];
 576
 577                         for (int i = 0; i < (int) TimerType.CountTimers; i++) {
 578                                 timer_start [i] = DateTime.Now;
 579                                 timers [i] = TimeSpan.Zero;
 580                         }
 581                 }
 582
 583                 [Conditional("TIMER")]
 584                 static public void IncrementCounter (CounterType which)
 585                 {
 586                         ++counters [(int) which];
 587                 }
 588
 589                 [Conditional("TIMER")]
 590                 static public void StartTimer (TimerType which)
 591                 {
 592                         timer_start [(int) which] = DateTime.Now;
 593                 }
 594
 595                 [Conditional("TIMER")]
 596                 static public void StopTimer (TimerType which)
 597                 {
 598                         timers [(int) which] += DateTime.Now - timer_start [(int) which];
 599                         ++timer_counters [(int) which];
 600                 }
 601
 602                 [Conditional("TIMER")]
 603                 static public void ShowTimers ()
 604                 {
 605                         ShowTimer (TimerType.FindMembers, "- FindMembers timer");
 606                         ShowTimer (TimerType.TcFindMembers, "- TypeContainer.FindMembers timer");
 607                         ShowTimer (TimerType.MemberLookup, "- MemberLookup timer");
 608                         ShowTimer (TimerType.CachedLookup, "- CachedLookup timer");
 609                         ShowTimer (TimerType.CacheInit, "- Cache init");
 610                         ShowTimer (TimerType.MiscTimer, "- Misc timer");
 611
 612                         ShowCounter (CounterType.FindMembers, "- Find members");
 613                         ShowCounter (CounterType.MemberCache, "- Member cache");
 614                         ShowCounter (CounterType.MiscCounter, "- Misc counter");
 615                 }
 616
 617                 static public void ShowCounter (CounterType which, string msg)
 618                 {
 619                         Console.WriteLine ("{0} {1}", counters [(int) which], msg);
 620                 }
 621
 622                 static public void ShowTimer (TimerType which, string msg)
 623                 {
 624                         Console.WriteLine (
 625                                 "[{0:00}:{1:000}] {2} (used {3} times)",
 626                                 (int) timers [(int) which].TotalSeconds,
 627                                 timers [(int) which].Milliseconds, msg,
 628                                 timer_counters [(int) which]);
 629                 }
 630         }
 631
 632         public class InternalErrorException : Exception {
 633                 public InternalErrorException (Location loc, string text, Exception e)
 634                         : base (loc + " " + text, e)
 635                 {
 636                 }
 637
 638                 public InternalErrorException ()
 639                         : base ("Internal error")
 640                 {
 641                 }
 642
 643                 public InternalErrorException (string message)
 644                         : base (message)
 645                 {
 646                 }
 647
 648                 public InternalErrorException (string message, params object[] args)
 649                         : base (String.Format (message, args))
 650                 { }
 651         }
 652
 653         /// <summary>
 654         /// Handles #pragma warning
 655         /// </summary>
 656         public class WarningRegions {
 657
 658                 abstract class PragmaCmd
 659                 {
 660                         public int Line;
 661
 662                         protected PragmaCmd (int line)
 663                         {
 664                                 Line = line;
 665                         }
 666
 667                         public abstract bool IsEnabled (int code, bool previous);
 668                 }
 669
 670                 class Disable : PragmaCmd
 671                 {
 672                         int code;
 673                         public Disable (int line, int code)
 674                                 : base (line)
 675                         {
 676                                 this.code = code;
 677                         }
 678
 679                         public override bool IsEnabled (int code, bool previous)
 680                         {
 681                                 return this.code == code ? false : previous;
 682                         }
 683                 }
 684
 685                 class DisableAll : PragmaCmd
 686                 {
 687                         public DisableAll (int line)
 688                                 : base (line) {}
 689
 690                         public override bool IsEnabled(int code, bool previous)
 691                         {
 692                                 return false;
 693                         }
 694                 }
 695
 696                 class Enable : PragmaCmd
 697                 {
 698                         int code;
 699                         public Enable (int line, int code)
 700                                 : base (line)
 701                         {
 702                                 this.code = code;
 703                         }
 704
 705                         public override bool IsEnabled(int code, bool previous)
 706                         {
 707                                 return this.code == code ? true : previous;
 708                         }
 709                 }
 710
 711                 class EnableAll : PragmaCmd
 712                 {
 713                         public EnableAll (int line)
 714                                 : base (line) {}
 715
 716                         public override bool IsEnabled(int code, bool previous)
 717                         {
 718                                 return true;
 719                         }
 720                 }
 721
 722
 723                 ArrayList regions = new ArrayList ();
 724
 725                 public void WarningDisable (int line)
 726                 {
 727                         regions.Add (new DisableAll (line));
 728                 }
 729
 730                 public void WarningDisable (Location location, int code)
 731                 {
 732                         if (CheckWarningCode (code, location))
 733                                 regions.Add (new Disable (location.Row, code));
 734                 }
 735
 736                 public void WarningEnable (int line)
 737                 {
 738                         regions.Add (new EnableAll (line));
 739                 }
 740
 741                 public void WarningEnable (Location location, int code)
 742                 {
 743                         if (CheckWarningCode (code, location))
 744                                 regions.Add (new Enable (location.Row, code));
 745                 }
 746
 747                 public bool IsWarningEnabled (int code, int src_line)
 748                 {
 749                         bool result = true;
 750                         foreach (PragmaCmd pragma in regions) {
 751                                 if (src_line < pragma.Line)
 752                                         break;
 753
 754                                 result = pragma.IsEnabled (code, result);
 755                         }
 756                         return result;
 757                 }
 758
 759                 static bool CheckWarningCode (int code, Location loc)
 760                 {
 761                         if (Report.IsValidWarning (code))
 762                                 return true;
 763
 764                         Report.Warning (1691, 1, loc, "`{0}' is not a valid warning number", code.ToString ());
 765                         return false;
 766                 }
 767         }
 768 }