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                 //
  68                 // This is used to save/restore the error state.  When the
  69                 // error stack contains elements, warnings and errors are not
  70                 // reported to the user.  This is used by the Lambda expression
  71                 // support to compile the code with various parameter values.
  72                 //
  73                 static Stack error_stack;
  74
  75                 /// <summary>
  76                 /// List of symbols related to reported error/warning. You have to fill it before error/warning is reported.
  77                 /// </summary>
  78                 static StringCollection extra_information = new StringCollection ();
  79
  80                 //
  81                 // IF YOU ADD A NEW WARNING YOU HAVE TO ADD ITS ID HERE
  82                 //
  83                 public static readonly int[] AllWarnings = new int[] {
  84                         28, 67, 78,
  85                         105, 108, 109, 114, 162, 164, 168, 169, 183, 184, 197,
  86                         219, 251, 252, 253, 278, 282,
  87                         419, 420, 429, 436, 440, 465, 467, 469,
  88                         612, 618, 626, 628, 642, 649, 652, 658, 659, 660, 661, 665, 672, 675,
  89                         809,
  90                         1030,
  91                         1522, 1570, 1571, 1572, 1573, 1574, 1580, 1581, 1584, 1587, 1589, 1590, 1591, 1592,
  92                         1616, 1633, 1634, 1635, 1685, 1690, 1691, 1692,
  93                         1717, 1718, 1720,
  94                         1901,
  95                         2002, 2023, 2029,
  96                         3005, 3012, 3018, 3019, 3021, 3022, 3023, 3026, 3027,
  97 #if GMCS_SOURCE
  98                         402, 414, 693, 1058, 1700, 3024
  99 #endif
 100                 };
 101
 102                 static Report ()
 103                 {
 104                         // Just to be sure that binary search is working
 105                         Array.Sort (AllWarnings);
 106                 }
 107
 108                 public static void Reset ()
 109                 {
 110                         Errors = Warnings = 0;
 111                         WarningsAreErrors = false;
 112                         warning_ignore_table = null;
 113                         warning_regions_table = null;
 114                 }
 115
 116                 public static void DisableErrors ()
 117                 {
 118                         if (error_stack == null)
 119                                 error_stack = new Stack ();
 120                         error_stack.Push (Errors);
 121                 }
 122
 123                 public static void EnableErrors ()
 124                 {
 125                         Errors = (int) error_stack.Pop ();
 126                 }
 127
 128                 abstract class AbstractMessage {
 129
 130                         static void Check (int code)
 131                         {
 132                                 if (code == expected_error) {
 133                                         Environment.Exit (0);
 134                                 }
 135                         }
 136
 137                         public abstract bool IsWarning { get; }
 138
 139                         public abstract string MessageType { get; }
 140
 141                         public virtual void Print (int code, string location, string text)
 142                         {
 143                                 if (error_stack != null && error_stack.Count != 0)
 144                                         return;
 145
 146                                 if (code < 0)
 147                                         code = 8000-code;
 148
 149                                 StringBuilder msg = new StringBuilder ();
 150                                 if (location.Length != 0) {
 151                                         msg.Append (location);
 152                                         msg.Append (' ');
 153                                 }
 154                                 msg.AppendFormat ("{0} CS{1:0000}: {2}", MessageType, code, text);
 155                                 Stderr.WriteLine (msg.ToString ());
 156
 157                                 foreach (string s in extra_information)
 158                                         Stderr.WriteLine (s + MessageType + ")");
 159
 160                                 extra_information.Clear ();
 161
 162                                 if (Stacktrace)
 163                                         Console.WriteLine (FriendlyStackTrace (new StackTrace (true)));
 164
 165                                 if (Fatal) {
 166                                         if (!IsWarning || WarningsAreErrors)
 167                                                 throw new Exception (text);
 168                                 }
 169
 170                                 Check (code);
 171                         }
 172
 173                         public virtual void Print (int code, Location location, string text)
 174                         {
 175                                 Print (code, location.IsNull ? "" : location.ToString (), text);
 176                         }
 177                 }
 178
 179                 sealed class WarningMessage : AbstractMessage {
 180                         Location loc = Location.Null;
 181                         readonly int Level;
 182
 183                         public WarningMessage (int level)
 184                         {
 185                                 Level = level;
 186                         }
 187
 188                         public override bool IsWarning {
 189                                 get { return true; }
 190                         }
 191
 192                         bool IsEnabled (int code)
 193                         {
 194                                 if (RootContext.WarningLevel < Level)
 195                                         return false;
 196
 197                                 if (warning_ignore_table != null) {
 198                                         if (warning_ignore_table.Contains (code)) {
 199                                                 return false;
 200                                         }
 201                                 }
 202
 203                                 if (warning_regions_table == null || loc.Equals (Location.Null))
 204                                         return true;
 205
 206                                 WarningRegions regions = (WarningRegions)warning_regions_table [loc.Name];
 207                                 if (regions == null)
 208                                         return true;
 209
 210                                 return regions.IsWarningEnabled (code, loc.Row);
 211                         }
 212
 213                         public override void Print(int code, string location, string text)
 214                         {
 215                                 if (!IsEnabled (code)) {
 216                                         extra_information.Clear ();
 217                                         return;
 218                                 }
 219
 220                                 if (WarningsAreErrors) {
 221                                         new ErrorMessage ().Print (code, location, text);
 222                                         return;
 223                                 }
 224
 225                                 Warnings++;
 226                                 base.Print (code, location, text);
 227                         }
 228
 229                         public override void Print(int code, Location location, string text)
 230                         {
 231                                 loc = location;
 232                                 base.Print (code, location, text);
 233                         }
 234
 235                         public override string MessageType {
 236                                 get {
 237                                         return "warning";
 238                                 }
 239                         }
 240                 }
 241
 242                 sealed class ErrorMessage : AbstractMessage {
 243
 244                         public override void Print(int code, string location, string text)
 245                         {
 246                                 Errors++;
 247                                 base.Print (code, location, text);
 248                         }
 249
 250                         public override bool IsWarning {
 251                                 get { return false; }
 252                         }
 253
 254                         public override string MessageType {
 255                                 get {
 256                                         return "error";
 257                                 }
 258                         }
 259
 260                 }
 261
 262                 public static void FeatureIsNotISO1 (Location loc, string feature)
 263                 {
 264                         Report.Error (1644, loc,
 265                                 "Feature `{0}' cannot be used because it is not part of the C# 1.0 language specification",
 266                                       feature);
 267                 }
 268
 269                 public static void FeatureRequiresLINQ (Location loc, string feature)
 270                 {
 271                         Report.Error (1644, loc,
 272                                       "Feature `{0}' can only be used if the language level is LINQ", feature);
 273                 }
 274
 275                 public static string FriendlyStackTrace (Exception e)
 276                 {
 277                         return FriendlyStackTrace (new StackTrace (e, true));
 278                 }
 279
 280                 static string FriendlyStackTrace (StackTrace t)
 281                 {
 282                         StringBuilder sb = new StringBuilder ();
 283
 284                         bool foundUserCode = false;
 285
 286                         for (int i = 0; i < t.FrameCount; i++) {
 287                                 StackFrame f = t.GetFrame (i);
 288                                 MethodBase mb = f.GetMethod ();
 289
 290                                 if (!foundUserCode && mb.ReflectedType == typeof (Report))
 291                                         continue;
 292
 293                                 foundUserCode = true;
 294
 295                                 sb.Append ("\tin ");
 296
 297                                 if (f.GetFileLineNumber () > 0)
 298                                         sb.AppendFormat ("(at {0}:{1}) ", f.GetFileName (), f.GetFileLineNumber ());
 299
 300                                 sb.AppendFormat ("{0}.{1} (", mb.ReflectedType.Name, mb.Name);
 301
 302                                 bool first = true;
 303                                 foreach (ParameterInfo pi in mb.GetParameters ()) {
 304                                         if (!first)
 305                                                 sb.Append (", ");
 306                                         first = false;
 307
 308                                         sb.Append (TypeManager.CSharpName (pi.ParameterType));
 309                                 }
 310                                 sb.Append (")\n");
 311                         }
 312
 313                         return sb.ToString ();
 314                 }
 315
 316                 public static void StackTrace ()
 317                 {
 318                         Console.WriteLine (FriendlyStackTrace (new StackTrace (true)));
 319                 }
 320
 321                 public static bool IsValidWarning (int code)
 322                 {
 323                         return Array.BinarySearch (AllWarnings, code) >= 0;
 324                 }
 325
 326                 static public void RuntimeMissingSupport (Location loc, string feature)
 327                 {
 328                         Report.Error (-88, loc, "Your .NET Runtime does not support `{0}'. Please use the latest Mono runtime instead.", feature);
 329                 }
 330
 331                 /// <summary>
 332                 /// In most error cases is very useful to have information about symbol that caused the error.
 333                 /// Call this method before you call Report.Error when it makes sense.
 334                 /// </summary>
 335                 static public void SymbolRelatedToPreviousError (Location loc, string symbol)
 336                 {
 337                         SymbolRelatedToPreviousError (loc.ToString (), symbol);
 338                 }
 339
 340                 static public void SymbolRelatedToPreviousError (MemberInfo mi)
 341                 {
 342                         Type dt = TypeManager.DropGenericTypeArguments (mi.DeclaringType);
 343                         DeclSpace temp_ds = TypeManager.LookupDeclSpace (dt);
 344                         if (temp_ds == null) {
 345                                 SymbolRelatedToPreviousError (dt.Assembly.Location, TypeManager.GetFullNameSignature (mi));
 346                         } else {
 347                                 MethodBase mb = mi as MethodBase;
 348                                 if (mb != null) {
 349                                         mb = TypeManager.DropGenericMethodArguments (mb);
 350                                         IMethodData md = TypeManager.GetMethod (mb);
 351                                         SymbolRelatedToPreviousError (md.Location, md.GetSignatureForError ());
 352                                         return;
 353                                 }
 354
 355                                 MemberCore mc = temp_ds.GetDefinition (mi.Name);
 356                                 SymbolRelatedToPreviousError (mc);
 357                         }
 358                 }
 359
 360                 static public void SymbolRelatedToPreviousError (MemberCore mc)
 361                 {
 362                         SymbolRelatedToPreviousError (mc.Location, mc.GetSignatureForError ());
 363                 }
 364
 365                 static public void SymbolRelatedToPreviousError (Type type)
 366                 {
 367                         type = TypeManager.DropGenericTypeArguments (type);
 368
 369                         if (TypeManager.IsGenericParameter (type)) {
 370                                 TypeParameter tp = TypeManager.LookupTypeParameter (type);
 371                                 if (tp != null) {
 372                                         SymbolRelatedToPreviousError (tp.Location, "");
 373                                         return;
 374                                 }
 375                         }
 376
 377                         if (type is TypeBuilder) {
 378                                 DeclSpace temp_ds = TypeManager.LookupDeclSpace (type);
 379                                 SymbolRelatedToPreviousError (temp_ds.Location, TypeManager.CSharpName (type));
 380                         } else if (type.HasElementType) {
 381                                 SymbolRelatedToPreviousError (type.GetElementType ());
 382                         } else {
 383                                 SymbolRelatedToPreviousError (type.Assembly.Location, TypeManager.CSharpName (type));
 384                         }
 385                 }
 386
 387                 static void SymbolRelatedToPreviousError (string loc, string symbol)
 388                 {
 389                         extra_information.Add (String.Format ("{0} (Location of the symbol related to previous ", loc));
 390                 }
 391
 392                 public static void ExtraInformation (Location loc, string msg)
 393                 {
 394                         extra_information.Add (String.Format ("{0} {1}", loc, msg));
 395                 }
 396
 397                 public static WarningRegions RegisterWarningRegion (Location location)
 398                 {
 399                         if (warning_regions_table == null)
 400                                 warning_regions_table = new Hashtable ();
 401
 402                         WarningRegions regions = (WarningRegions)warning_regions_table [location.Name];
 403                         if (regions == null) {
 404                                 regions = new WarningRegions ();
 405                                 warning_regions_table.Add (location.Name, regions);
 406                         }
 407                         return regions;
 408                 }
 409
 410                 static public void Warning (int code, int level, Location loc, string message)
 411                 {
 412                         WarningMessage w = new WarningMessage (level);
 413                         w.Print (code, loc, message);
 414                 }
 415
 416                 static public void Warning (int code, int level, Location loc, string format, string arg)
 417                 {
 418                         WarningMessage w = new WarningMessage (level);
 419                         w.Print (code, loc, String.Format (format, arg));
 420                 }
 421
 422                 static public void Warning (int code, int level, Location loc, string format, string arg1, string arg2)
 423                 {
 424                         WarningMessage w = new WarningMessage (level);
 425                         w.Print (code, loc, String.Format (format, arg1, arg2));
 426                 }
 427
 428                 static public void Warning (int code, int level, Location loc, string format, params string[] args)
 429                 {
 430                         WarningMessage w = new WarningMessage (level);
 431                         w.Print (code, loc, String.Format (format, args));
 432                 }
 433
 434                 static public void Warning (int code, int level, string message)
 435                 {
 436                         Warning (code, level, Location.Null, message);
 437                 }
 438
 439                 static public void Warning (int code, int level, string format, string arg)
 440                 {
 441                         Warning (code, level, Location.Null, format, arg);
 442                 }
 443
 444                 static public void Warning (int code, int level, string format, string arg1, string arg2)
 445                 {
 446                         Warning (code, level, Location.Null, format, arg1, arg2);
 447                 }
 448
 449                 static public void Warning (int code, int level, string format, params string[] args)
 450                 {
 451                         Warning (code, level, Location.Null, String.Format (format, args));
 452                 }
 453
 454                 static public void Error (int code, Location loc, string error)
 455                 {
 456                         new ErrorMessage ().Print (code, loc, error);
 457                 }
 458
 459                 static public void Error (int code, Location loc, string format, string arg)
 460                 {
 461                         new ErrorMessage ().Print (code, loc, String.Format (format, arg));
 462                 }
 463
 464                 static public void Error (int code, Location loc, string format, string arg1, string arg2)
 465                 {
 466                         new ErrorMessage ().Print (code, loc, String.Format (format, arg1, arg2));
 467                 }
 468
 469                 static public void Error (int code, Location loc, string format, params string[] args)
 470                 {
 471                         Error (code, loc, String.Format (format, args));
 472                 }
 473
 474                 static public void Error (int code, string error)
 475                 {
 476                         Error (code, Location.Null, error);
 477                 }
 478
 479                 static public void Error (int code, string format, string arg)
 480                 {
 481                         Error (code, Location.Null, format, arg);
 482                 }
 483
 484                 static public void Error (int code, string format, string arg1, string arg2)
 485                 {
 486                         Error (code, Location.Null, format, arg1, arg2);
 487                 }
 488
 489                 static public void Error (int code, string format, params string[] args)
 490                 {
 491                         Error (code, Location.Null, String.Format (format, args));
 492                 }
 493
 494                 static public void SetIgnoreWarning (int code)
 495                 {
 496                         if (warning_ignore_table == null)
 497                                 warning_ignore_table = new Hashtable ();
 498
 499                         warning_ignore_table [code] = true;
 500                 }
 501
 502                 static public int ExpectedError {
 503                         set {
 504                                 expected_error = value;
 505                         }
 506                         get {
 507                                 return expected_error;
 508                         }
 509                 }
 510
 511                 public static int DebugFlags = 0;
 512
 513                 [Conditional ("MCS_DEBUG")]
 514                 static public void Debug (string message, params object[] args)
 515                 {
 516                         Debug (4, message, args);
 517                 }
 518
 519                 [Conditional ("MCS_DEBUG")]
 520                 static public void Debug (int category, string message, params object[] args)
 521                 {
 522                         if ((category & DebugFlags) == 0)
 523                                 return;
 524
 525                         StringBuilder sb = new StringBuilder (message);
 526
 527                         if ((args != null) && (args.Length > 0)) {
 528                                 sb.Append (": ");
 529
 530                                 bool first = true;
 531                                 foreach (object arg in args) {
 532                                         if (first)
 533                                                 first = false;
 534                                         else
 535                                                 sb.Append (", ");
 536                                         if (arg == null)
 537                                                 sb.Append ("null");
 538                                         else if (arg is ICollection)
 539                                                 sb.Append (PrintCollection ((ICollection) arg));
 540                                         else
 541                                                 sb.Append (arg);
 542                                 }
 543                         }
 544
 545                         Console.WriteLine (sb.ToString ());
 546                 }
 547
 548                 static public string PrintCollection (ICollection collection)
 549                 {
 550                         StringBuilder sb = new StringBuilder ();
 551
 552                         sb.Append (collection.GetType ());
 553                         sb.Append ("(");
 554
 555                         bool first = true;
 556                         foreach (object o in collection) {
 557                                 if (first)
 558                                         first = false;
 559                                 else
 560                                         sb.Append (", ");
 561                                 sb.Append (o);
 562                         }
 563
 564                         sb.Append (")");
 565                         return sb.ToString ();
 566                 }
 567         }
 568
 569         public enum TimerType {
 570                 FindMembers     = 0,
 571                 TcFindMembers   = 1,
 572                 MemberLookup    = 2,
 573                 CachedLookup    = 3,
 574                 CacheInit       = 4,
 575                 MiscTimer       = 5,
 576                 CountTimers     = 6
 577         }
 578
 579         public enum CounterType {
 580                 FindMembers     = 0,
 581                 MemberCache     = 1,
 582                 MiscCounter     = 2,
 583                 CountCounters   = 3
 584         }
 585
 586         public class Timer
 587         {
 588                 static DateTime[] timer_start;
 589                 static TimeSpan[] timers;
 590                 static long[] timer_counters;
 591                 static long[] counters;
 592
 593                 static Timer ()
 594                 {
 595                         timer_start = new DateTime [(int) TimerType.CountTimers];
 596                         timers = new TimeSpan [(int) TimerType.CountTimers];
 597                         timer_counters = new long [(int) TimerType.CountTimers];
 598                         counters = new long [(int) CounterType.CountCounters];
 599
 600                         for (int i = 0; i < (int) TimerType.CountTimers; i++) {
 601                                 timer_start [i] = DateTime.Now;
 602                                 timers [i] = TimeSpan.Zero;
 603                         }
 604                 }
 605
 606                 [Conditional("TIMER")]
 607                 static public void IncrementCounter (CounterType which)
 608                 {
 609                         ++counters [(int) which];
 610                 }
 611
 612                 [Conditional("TIMER")]
 613                 static public void StartTimer (TimerType which)
 614                 {
 615                         timer_start [(int) which] = DateTime.Now;
 616                 }
 617
 618                 [Conditional("TIMER")]
 619                 static public void StopTimer (TimerType which)
 620                 {
 621                         timers [(int) which] += DateTime.Now - timer_start [(int) which];
 622                         ++timer_counters [(int) which];
 623                 }
 624
 625                 [Conditional("TIMER")]
 626                 static public void ShowTimers ()
 627                 {
 628                         ShowTimer (TimerType.FindMembers, "- FindMembers timer");
 629                         ShowTimer (TimerType.TcFindMembers, "- TypeContainer.FindMembers timer");
 630                         ShowTimer (TimerType.MemberLookup, "- MemberLookup timer");
 631                         ShowTimer (TimerType.CachedLookup, "- CachedLookup timer");
 632                         ShowTimer (TimerType.CacheInit, "- Cache init");
 633                         ShowTimer (TimerType.MiscTimer, "- Misc timer");
 634
 635                         ShowCounter (CounterType.FindMembers, "- Find members");
 636                         ShowCounter (CounterType.MemberCache, "- Member cache");
 637                         ShowCounter (CounterType.MiscCounter, "- Misc counter");
 638                 }
 639
 640                 static public void ShowCounter (CounterType which, string msg)
 641                 {
 642                         Console.WriteLine ("{0} {1}", counters [(int) which], msg);
 643                 }
 644
 645                 static public void ShowTimer (TimerType which, string msg)
 646                 {
 647                         Console.WriteLine (
 648                                 "[{0:00}:{1:000}] {2} (used {3} times)",
 649                                 (int) timers [(int) which].TotalSeconds,
 650                                 timers [(int) which].Milliseconds, msg,
 651                                 timer_counters [(int) which]);
 652                 }
 653         }
 654
 655         public class InternalErrorException : Exception {
 656                 public InternalErrorException (MemberCore mc, Exception e)
 657                         : base (mc.Location + " " + mc.GetSignatureForError (), e)
 658                 {
 659                 }
 660
 661                 public InternalErrorException ()
 662                         : base ("Internal error")
 663                 {
 664                 }
 665
 666                 public InternalErrorException (string message)
 667                         : base (message)
 668                 {
 669                 }
 670
 671                 public InternalErrorException (string message, params object[] args)
 672                         : base (String.Format (message, args))
 673                 { }
 674         }
 675
 676         /// <summary>
 677         /// Handles #pragma warning
 678         /// </summary>
 679         public class WarningRegions {
 680
 681                 abstract class PragmaCmd
 682                 {
 683                         public int Line;
 684
 685                         protected PragmaCmd (int line)
 686                         {
 687                                 Line = line;
 688                         }
 689
 690                         public abstract bool IsEnabled (int code, bool previous);
 691                 }
 692
 693                 class Disable : PragmaCmd
 694                 {
 695                         int code;
 696                         public Disable (int line, int code)
 697                                 : base (line)
 698                         {
 699                                 this.code = code;
 700                         }
 701
 702                         public override bool IsEnabled (int code, bool previous)
 703                         {
 704                                 return this.code == code ? false : previous;
 705                         }
 706                 }
 707
 708                 class DisableAll : PragmaCmd
 709                 {
 710                         public DisableAll (int line)
 711                                 : base (line) {}
 712
 713                         public override bool IsEnabled(int code, bool previous)
 714                         {
 715                                 return false;
 716                         }
 717                 }
 718
 719                 class Enable : PragmaCmd
 720                 {
 721                         int code;
 722                         public Enable (int line, int code)
 723                                 : base (line)
 724                         {
 725                                 this.code = code;
 726                         }
 727
 728                         public override bool IsEnabled(int code, bool previous)
 729                         {
 730                                 return this.code == code ? true : previous;
 731                         }
 732                 }
 733
 734                 class EnableAll : PragmaCmd
 735                 {
 736                         public EnableAll (int line)
 737                                 : base (line) {}
 738
 739                         public override bool IsEnabled(int code, bool previous)
 740                         {
 741                                 return true;
 742                         }
 743                 }
 744
 745
 746                 ArrayList regions = new ArrayList ();
 747
 748                 public void WarningDisable (int line)
 749                 {
 750                         regions.Add (new DisableAll (line));
 751                 }
 752
 753                 public void WarningDisable (Location location, int code)
 754                 {
 755                         if (CheckWarningCode (code, location))
 756                                 regions.Add (new Disable (location.Row, code));
 757                 }
 758
 759                 public void WarningEnable (int line)
 760                 {
 761                         regions.Add (new EnableAll (line));
 762                 }
 763
 764                 public void WarningEnable (Location location, int code)
 765                 {
 766                         if (CheckWarningCode (code, location))
 767                                 regions.Add (new Enable (location.Row, code));
 768                 }
 769
 770                 public bool IsWarningEnabled (int code, int src_line)
 771                 {
 772                         bool result = true;
 773                         foreach (PragmaCmd pragma in regions) {
 774                                 if (src_line < pragma.Line)
 775                                         break;
 776
 777                                 result = pragma.IsEnabled (code, result);
 778                         }
 779                         return result;
 780                 }
 781
 782                 static bool CheckWarningCode (int code, Location loc)
 783                 {
 784                         if (Report.IsValidWarning (code))
 785                                 return true;
 786
 787                         Report.Warning (1691, 1, loc, "`{0}' is not a valid warning number", code.ToString ());
 788                         return false;
 789                 }
 790         }
 791 }