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                                         //
 145                                         // This line is useful when debugging the inner working of
 146                                         // Lambdas when various compilation attempts are done.
 147                                         //
 148                                         //Console.WriteLine ("DISABLED: {0} {1} {2}", code, location, text);
 149                                         return;
 150                                 }
 151
 152                                 if (code < 0)
 153                                         code = 8000-code;
 154
 155                                 StringBuilder msg = new StringBuilder ();
 156                                 if (location.Length != 0) {
 157                                         msg.Append (location);
 158                                         msg.Append (' ');
 159                                 }
 160                                 msg.AppendFormat ("{0} CS{1:0000}: {2}", MessageType, code, text);
 161                                 Stderr.WriteLine (msg.ToString ());
 162
 163                                 foreach (string s in extra_information)
 164                                         Stderr.WriteLine (s + MessageType + ")");
 165
 166                                 extra_information.Clear ();
 167
 168                                 if (Stacktrace)
 169                                         Console.WriteLine (FriendlyStackTrace (new StackTrace (true)));
 170
 171                                 if (Fatal) {
 172                                         if (!IsWarning || WarningsAreErrors)
 173                                                 throw new Exception (text);
 174                                 }
 175
 176                                 Check (code);
 177                         }
 178
 179                         public virtual void Print (int code, Location location, string text)
 180                         {
 181                                 Print (code, location.IsNull ? "" : location.ToString (), text);
 182                         }
 183                 }
 184
 185                 sealed class WarningMessage : AbstractMessage {
 186                         Location loc = Location.Null;
 187                         readonly int Level;
 188
 189                         public WarningMessage (int level)
 190                         {
 191                                 Level = level;
 192                         }
 193
 194                         public override bool IsWarning {
 195                                 get { return true; }
 196                         }
 197
 198                         bool IsEnabled (int code)
 199                         {
 200                                 if (RootContext.WarningLevel < Level)
 201                                         return false;
 202
 203                                 if (warning_ignore_table != null) {
 204                                         if (warning_ignore_table.Contains (code)) {
 205                                                 return false;
 206                                         }
 207                                 }
 208
 209                                 if (warning_regions_table == null || loc.Equals (Location.Null))
 210                                         return true;
 211
 212                                 WarningRegions regions = (WarningRegions)warning_regions_table [loc.Name];
 213                                 if (regions == null)
 214                                         return true;
 215
 216                                 return regions.IsWarningEnabled (code, loc.Row);
 217                         }
 218
 219                         public override void Print(int code, string location, string text)
 220                         {
 221                                 if (!IsEnabled (code)) {
 222                                         extra_information.Clear ();
 223                                         return;
 224                                 }
 225
 226                                 if (WarningsAreErrors) {
 227                                         new ErrorMessage ().Print (code, location, text);
 228                                         return;
 229                                 }
 230
 231                                 Warnings++;
 232                                 base.Print (code, location, text);
 233                         }
 234
 235                         public override void Print(int code, Location location, string text)
 236                         {
 237                                 loc = location;
 238                                 base.Print (code, location, text);
 239                         }
 240
 241                         public override string MessageType {
 242                                 get {
 243                                         return "warning";
 244                                 }
 245                         }
 246                 }
 247
 248                 sealed class ErrorMessage : AbstractMessage {
 249
 250                         public override void Print(int code, string location, string text)
 251                         {
 252                                 Errors++;
 253                                 base.Print (code, location, text);
 254                         }
 255
 256                         public override bool IsWarning {
 257                                 get { return false; }
 258                         }
 259
 260                         public override string MessageType {
 261                                 get {
 262                                         return "error";
 263                                 }
 264                         }
 265
 266                 }
 267
 268                 public static void FeatureIsNotISO1 (Location loc, string feature)
 269                 {
 270                         Report.Error (1644, loc,
 271                                 "Feature `{0}' cannot be used because it is not part of the C# 1.0 language specification",
 272                                       feature);
 273                 }
 274
 275                 public static void FeatureRequiresLINQ (Location loc, string feature)
 276                 {
 277                         Report.Error (1644, loc,
 278                                       "Feature `{0}' can only be used if the language level is LINQ", feature);
 279                 }
 280
 281                 public static string FriendlyStackTrace (Exception e)
 282                 {
 283                         return FriendlyStackTrace (new StackTrace (e, true));
 284                 }
 285
 286                 static string FriendlyStackTrace (StackTrace t)
 287                 {
 288                         StringBuilder sb = new StringBuilder ();
 289
 290                         bool foundUserCode = false;
 291
 292                         for (int i = 0; i < t.FrameCount; i++) {
 293                                 StackFrame f = t.GetFrame (i);
 294                                 MethodBase mb = f.GetMethod ();
 295
 296                                 if (!foundUserCode && mb.ReflectedType == typeof (Report))
 297                                         continue;
 298
 299                                 foundUserCode = true;
 300
 301                                 sb.Append ("\tin ");
 302
 303                                 if (f.GetFileLineNumber () > 0)
 304                                         sb.AppendFormat ("(at {0}:{1}) ", f.GetFileName (), f.GetFileLineNumber ());
 305
 306                                 sb.AppendFormat ("{0}.{1} (", mb.ReflectedType.Name, mb.Name);
 307
 308                                 bool first = true;
 309                                 foreach (ParameterInfo pi in mb.GetParameters ()) {
 310                                         if (!first)
 311                                                 sb.Append (", ");
 312                                         first = false;
 313
 314                                         sb.Append (TypeManager.CSharpName (pi.ParameterType));
 315                                 }
 316                                 sb.Append (")\n");
 317                         }
 318
 319                         return sb.ToString ();
 320                 }
 321
 322                 public static void StackTrace ()
 323                 {
 324                         Console.WriteLine (FriendlyStackTrace (new StackTrace (true)));
 325                 }
 326
 327                 public static bool IsValidWarning (int code)
 328                 {
 329                         return Array.BinarySearch (AllWarnings, code) >= 0;
 330                 }
 331
 332                 static public void RuntimeMissingSupport (Location loc, string feature)
 333                 {
 334                         Report.Error (-88, loc, "Your .NET Runtime does not support `{0}'. Please use the latest Mono runtime instead.", feature);
 335                 }
 336
 337                 /// <summary>
 338                 /// In most error cases is very useful to have information about symbol that caused the error.
 339                 /// Call this method before you call Report.Error when it makes sense.
 340                 /// </summary>
 341                 static public void SymbolRelatedToPreviousError (Location loc, string symbol)
 342                 {
 343                         SymbolRelatedToPreviousError (loc.ToString (), symbol);
 344                 }
 345
 346                 static public void SymbolRelatedToPreviousError (MemberInfo mi)
 347                 {
 348                         Type dt = TypeManager.DropGenericTypeArguments (mi.DeclaringType);
 349                         DeclSpace temp_ds = TypeManager.LookupDeclSpace (dt);
 350                         if (temp_ds == null) {
 351                                 SymbolRelatedToPreviousError (dt.Assembly.Location, TypeManager.GetFullNameSignature (mi));
 352                         } else {
 353                                 MethodBase mb = mi as MethodBase;
 354                                 if (mb != null) {
 355                                         mb = TypeManager.DropGenericMethodArguments (mb);
 356                                         IMethodData md = TypeManager.GetMethod (mb);
 357                                         SymbolRelatedToPreviousError (md.Location, md.GetSignatureForError ());
 358                                         return;
 359                                 }
 360
 361                                 MemberCore mc = temp_ds.GetDefinition (mi.Name);
 362                                 SymbolRelatedToPreviousError (mc);
 363                         }
 364                 }
 365
 366                 static public void SymbolRelatedToPreviousError (MemberCore mc)
 367                 {
 368                         SymbolRelatedToPreviousError (mc.Location, mc.GetSignatureForError ());
 369                 }
 370
 371                 static public void SymbolRelatedToPreviousError (Type type)
 372                 {
 373                         type = TypeManager.DropGenericTypeArguments (type);
 374
 375                         if (TypeManager.IsGenericParameter (type)) {
 376                                 TypeParameter tp = TypeManager.LookupTypeParameter (type);
 377                                 if (tp != null) {
 378                                         SymbolRelatedToPreviousError (tp.Location, "");
 379                                         return;
 380                                 }
 381                         }
 382
 383                         if (type is TypeBuilder) {
 384                                 DeclSpace temp_ds = TypeManager.LookupDeclSpace (type);
 385                                 SymbolRelatedToPreviousError (temp_ds.Location, TypeManager.CSharpName (type));
 386                         } else if (type.HasElementType) {
 387                                 SymbolRelatedToPreviousError (type.GetElementType ());
 388                         } else {
 389                                 SymbolRelatedToPreviousError (type.Assembly.Location, TypeManager.CSharpName (type));
 390                         }
 391                 }
 392
 393                 static void SymbolRelatedToPreviousError (string loc, string symbol)
 394                 {
 395                         extra_information.Add (String.Format ("{0} (Location of the symbol related to previous ", loc));
 396                 }
 397
 398                 public static void ExtraInformation (Location loc, string msg)
 399                 {
 400                         extra_information.Add (String.Format ("{0} {1}", loc, msg));
 401                 }
 402
 403                 public static WarningRegions RegisterWarningRegion (Location location)
 404                 {
 405                         if (warning_regions_table == null)
 406                                 warning_regions_table = new Hashtable ();
 407
 408                         WarningRegions regions = (WarningRegions)warning_regions_table [location.Name];
 409                         if (regions == null) {
 410                                 regions = new WarningRegions ();
 411                                 warning_regions_table.Add (location.Name, regions);
 412                         }
 413                         return regions;
 414                 }
 415
 416                 static public void Warning (int code, int level, Location loc, string message)
 417                 {
 418                         WarningMessage w = new WarningMessage (level);
 419                         w.Print (code, loc, message);
 420                 }
 421
 422                 static public void Warning (int code, int level, Location loc, string format, string arg)
 423                 {
 424                         WarningMessage w = new WarningMessage (level);
 425                         w.Print (code, loc, String.Format (format, arg));
 426                 }
 427
 428                 static public void Warning (int code, int level, Location loc, string format, string arg1, string arg2)
 429                 {
 430                         WarningMessage w = new WarningMessage (level);
 431                         w.Print (code, loc, String.Format (format, arg1, arg2));
 432                 }
 433
 434                 static public void Warning (int code, int level, Location loc, string format, params string[] args)
 435                 {
 436                         WarningMessage w = new WarningMessage (level);
 437                         w.Print (code, loc, String.Format (format, args));
 438                 }
 439
 440                 static public void Warning (int code, int level, string message)
 441                 {
 442                         Warning (code, level, Location.Null, message);
 443                 }
 444
 445                 static public void Warning (int code, int level, string format, string arg)
 446                 {
 447                         Warning (code, level, Location.Null, format, arg);
 448                 }
 449
 450                 static public void Warning (int code, int level, string format, string arg1, string arg2)
 451                 {
 452                         Warning (code, level, Location.Null, format, arg1, arg2);
 453                 }
 454
 455                 static public void Warning (int code, int level, string format, params string[] args)
 456                 {
 457                         Warning (code, level, Location.Null, String.Format (format, args));
 458                 }
 459
 460                 static public void Error (int code, Location loc, string error)
 461                 {
 462                         new ErrorMessage ().Print (code, loc, error);
 463                 }
 464
 465                 static public void Error (int code, Location loc, string format, string arg)
 466                 {
 467                         new ErrorMessage ().Print (code, loc, String.Format (format, arg));
 468                 }
 469
 470                 static public void Error (int code, Location loc, string format, string arg1, string arg2)
 471                 {
 472                         new ErrorMessage ().Print (code, loc, String.Format (format, arg1, arg2));
 473                 }
 474
 475                 static public void Error (int code, Location loc, string format, params string[] args)
 476                 {
 477                         Error (code, loc, String.Format (format, args));
 478                 }
 479
 480                 static public void Error (int code, string error)
 481                 {
 482                         Error (code, Location.Null, error);
 483                 }
 484
 485                 static public void Error (int code, string format, string arg)
 486                 {
 487                         Error (code, Location.Null, format, arg);
 488                 }
 489
 490                 static public void Error (int code, string format, string arg1, string arg2)
 491                 {
 492                         Error (code, Location.Null, format, arg1, arg2);
 493                 }
 494
 495                 static public void Error (int code, string format, params string[] args)
 496                 {
 497                         Error (code, Location.Null, String.Format (format, args));
 498                 }
 499
 500                 static public void SetIgnoreWarning (int code)
 501                 {
 502                         if (warning_ignore_table == null)
 503                                 warning_ignore_table = new Hashtable ();
 504
 505                         warning_ignore_table [code] = true;
 506                 }
 507
 508                 static public int ExpectedError {
 509                         set {
 510                                 expected_error = value;
 511                         }
 512                         get {
 513                                 return expected_error;
 514                         }
 515                 }
 516
 517                 public static int DebugFlags = 0;
 518
 519                 [Conditional ("MCS_DEBUG")]
 520                 static public void Debug (string message, params object[] args)
 521                 {
 522                         Debug (4, message, args);
 523                 }
 524
 525                 [Conditional ("MCS_DEBUG")]
 526                 static public void Debug (int category, string message, params object[] args)
 527                 {
 528                         if ((category & DebugFlags) == 0)
 529                                 return;
 530
 531                         StringBuilder sb = new StringBuilder (message);
 532
 533                         if ((args != null) && (args.Length > 0)) {
 534                                 sb.Append (": ");
 535
 536                                 bool first = true;
 537                                 foreach (object arg in args) {
 538                                         if (first)
 539                                                 first = false;
 540                                         else
 541                                                 sb.Append (", ");
 542                                         if (arg == null)
 543                                                 sb.Append ("null");
 544                                         else if (arg is ICollection)
 545                                                 sb.Append (PrintCollection ((ICollection) arg));
 546                                         else
 547                                                 sb.Append (arg);
 548                                 }
 549                         }
 550
 551                         Console.WriteLine (sb.ToString ());
 552                 }
 553
 554                 static public string PrintCollection (ICollection collection)
 555                 {
 556                         StringBuilder sb = new StringBuilder ();
 557
 558                         sb.Append (collection.GetType ());
 559                         sb.Append ("(");
 560
 561                         bool first = true;
 562                         foreach (object o in collection) {
 563                                 if (first)
 564                                         first = false;
 565                                 else
 566                                         sb.Append (", ");
 567                                 sb.Append (o);
 568                         }
 569
 570                         sb.Append (")");
 571                         return sb.ToString ();
 572                 }
 573         }
 574
 575         public enum TimerType {
 576                 FindMembers     = 0,
 577                 TcFindMembers   = 1,
 578                 MemberLookup    = 2,
 579                 CachedLookup    = 3,
 580                 CacheInit       = 4,
 581                 MiscTimer       = 5,
 582                 CountTimers     = 6
 583         }
 584
 585         public enum CounterType {
 586                 FindMembers     = 0,
 587                 MemberCache     = 1,
 588                 MiscCounter     = 2,
 589                 CountCounters   = 3
 590         }
 591
 592         public class Timer
 593         {
 594                 static DateTime[] timer_start;
 595                 static TimeSpan[] timers;
 596                 static long[] timer_counters;
 597                 static long[] counters;
 598
 599                 static Timer ()
 600                 {
 601                         timer_start = new DateTime [(int) TimerType.CountTimers];
 602                         timers = new TimeSpan [(int) TimerType.CountTimers];
 603                         timer_counters = new long [(int) TimerType.CountTimers];
 604                         counters = new long [(int) CounterType.CountCounters];
 605
 606                         for (int i = 0; i < (int) TimerType.CountTimers; i++) {
 607                                 timer_start [i] = DateTime.Now;
 608                                 timers [i] = TimeSpan.Zero;
 609                         }
 610                 }
 611
 612                 [Conditional("TIMER")]
 613                 static public void IncrementCounter (CounterType which)
 614                 {
 615                         ++counters [(int) which];
 616                 }
 617
 618                 [Conditional("TIMER")]
 619                 static public void StartTimer (TimerType which)
 620                 {
 621                         timer_start [(int) which] = DateTime.Now;
 622                 }
 623
 624                 [Conditional("TIMER")]
 625                 static public void StopTimer (TimerType which)
 626                 {
 627                         timers [(int) which] += DateTime.Now - timer_start [(int) which];
 628                         ++timer_counters [(int) which];
 629                 }
 630
 631                 [Conditional("TIMER")]
 632                 static public void ShowTimers ()
 633                 {
 634                         ShowTimer (TimerType.FindMembers, "- FindMembers timer");
 635                         ShowTimer (TimerType.TcFindMembers, "- TypeContainer.FindMembers timer");
 636                         ShowTimer (TimerType.MemberLookup, "- MemberLookup timer");
 637                         ShowTimer (TimerType.CachedLookup, "- CachedLookup timer");
 638                         ShowTimer (TimerType.CacheInit, "- Cache init");
 639                         ShowTimer (TimerType.MiscTimer, "- Misc timer");
 640
 641                         ShowCounter (CounterType.FindMembers, "- Find members");
 642                         ShowCounter (CounterType.MemberCache, "- Member cache");
 643                         ShowCounter (CounterType.MiscCounter, "- Misc counter");
 644                 }
 645
 646                 static public void ShowCounter (CounterType which, string msg)
 647                 {
 648                         Console.WriteLine ("{0} {1}", counters [(int) which], msg);
 649                 }
 650
 651                 static public void ShowTimer (TimerType which, string msg)
 652                 {
 653                         Console.WriteLine (
 654                                 "[{0:00}:{1:000}] {2} (used {3} times)",
 655                                 (int) timers [(int) which].TotalSeconds,
 656                                 timers [(int) which].Milliseconds, msg,
 657                                 timer_counters [(int) which]);
 658                 }
 659         }
 660
 661         public class InternalErrorException : Exception {
 662                 public InternalErrorException (MemberCore mc, Exception e)
 663                         : base (mc.Location + " " + mc.GetSignatureForError (), e)
 664                 {
 665                 }
 666
 667                 public InternalErrorException ()
 668                         : base ("Internal error")
 669                 {
 670                 }
 671
 672                 public InternalErrorException (string message)
 673                         : base (message)
 674                 {
 675                 }
 676
 677                 public InternalErrorException (string message, params object[] args)
 678                         : base (String.Format (message, args))
 679                 { }
 680         }
 681
 682         /// <summary>
 683         /// Handles #pragma warning
 684         /// </summary>
 685         public class WarningRegions {
 686
 687                 abstract class PragmaCmd
 688                 {
 689                         public int Line;
 690
 691                         protected PragmaCmd (int line)
 692                         {
 693                                 Line = line;
 694                         }
 695
 696                         public abstract bool IsEnabled (int code, bool previous);
 697                 }
 698
 699                 class Disable : PragmaCmd
 700                 {
 701                         int code;
 702                         public Disable (int line, int code)
 703                                 : base (line)
 704                         {
 705                                 this.code = code;
 706                         }
 707
 708                         public override bool IsEnabled (int code, bool previous)
 709                         {
 710                                 return this.code == code ? false : previous;
 711                         }
 712                 }
 713
 714                 class DisableAll : PragmaCmd
 715                 {
 716                         public DisableAll (int line)
 717                                 : base (line) {}
 718
 719                         public override bool IsEnabled(int code, bool previous)
 720                         {
 721                                 return false;
 722                         }
 723                 }
 724
 725                 class Enable : PragmaCmd
 726                 {
 727                         int code;
 728                         public Enable (int line, int code)
 729                                 : base (line)
 730                         {
 731                                 this.code = code;
 732                         }
 733
 734                         public override bool IsEnabled(int code, bool previous)
 735                         {
 736                                 return this.code == code ? true : previous;
 737                         }
 738                 }
 739
 740                 class EnableAll : PragmaCmd
 741                 {
 742                         public EnableAll (int line)
 743                                 : base (line) {}
 744
 745                         public override bool IsEnabled(int code, bool previous)
 746                         {
 747                                 return true;
 748                         }
 749                 }
 750
 751
 752                 ArrayList regions = new ArrayList ();
 753
 754                 public void WarningDisable (int line)
 755                 {
 756                         regions.Add (new DisableAll (line));
 757                 }
 758
 759                 public void WarningDisable (Location location, int code)
 760                 {
 761                         if (CheckWarningCode (code, location))
 762                                 regions.Add (new Disable (location.Row, code));
 763                 }
 764
 765                 public void WarningEnable (int line)
 766                 {
 767                         regions.Add (new EnableAll (line));
 768                 }
 769
 770                 public void WarningEnable (Location location, int code)
 771                 {
 772                         if (CheckWarningCode (code, location))
 773                                 regions.Add (new Enable (location.Row, code));
 774                 }
 775
 776                 public bool IsWarningEnabled (int code, int src_line)
 777                 {
 778                         bool result = true;
 779                         foreach (PragmaCmd pragma in regions) {
 780                                 if (src_line < pragma.Line)
 781                                         break;
 782
 783                                 result = pragma.IsEnabled (code, result);
 784                         }
 785                         return result;
 786                 }
 787
 788                 static bool CheckWarningCode (int code, Location loc)
 789                 {
 790                         if (Report.IsValidWarning (code))
 791                                 return true;
 792
 793                         Report.Warning (1691, 1, loc, "`{0}' is not a valid warning number", code.ToString ());
 794                         return false;
 795                 }
 796         }
 797 }