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
  46                 /// <summary>
  47                 ///   Whether to dump a stack trace on errors.
  48                 /// </summary>
  49                 static public bool Stacktrace;
  50
  51                 static public TextWriter Stderr = Console.Error;
  52
  53                 //
  54                 // If the 'expected' error code is reported then the
  55                 // compilation succeeds.
  56                 //
  57                 // Used for the test suite to excercise the error codes
  58                 //
  59                 static int expected_error = 0;
  60
  61                 //
  62                 // Keeps track of the warnings that we are ignoring
  63                 //
  64                 public static Hashtable warning_ignore_table;
  65
  66                 static Hashtable warning_regions_table;
  67
  68                 //
  69                 // This is used to save/restore the error state.  When the
  70                 // error stack contains elements, warnings and errors are not
  71                 // reported to the user.  This is used by the Lambda expression
  72                 // support to compile the code with various parameter values.
  73                 // A stack because of `Report.Errors == errors;'
  74                 //
  75                 static Stack error_stack;
  76                 static bool reporting_disabled;
  77
  78                 static int warning_level;
  79
  80                 /// <summary>
  81                 /// List of symbols related to reported error/warning. You have to fill it before error/warning is reported.
  82                 /// </summary>
  83                 static StringCollection extra_information = new StringCollection ();
  84
  85                 //
  86                 // IF YOU ADD A NEW WARNING YOU HAVE TO ADD ITS ID HERE
  87                 //
  88                 public static readonly int[] AllWarnings = new int[] {
  89                         28, 67, 78,
  90                         105, 108, 109, 114, 162, 164, 168, 169, 183, 184, 197,
  91                         219, 251, 252, 253, 278, 282,
  92                         419, 420, 429, 436, 440, 465, 467, 469,
  93                         612, 618, 626, 628, 642, 649, 652, 658, 659, 660, 661, 665, 672, 675,
  94                         809,
  95                         1030,
  96                         1522, 1570, 1571, 1572, 1573, 1574, 1580, 1581, 1584, 1587, 1589, 1590, 1591, 1592,
  97                         1616, 1633, 1634, 1635, 1685, 1690, 1691, 1692,
  98                         1717, 1718, 1720,
  99                         1901,
 100                         2002, 2023, 2029,
 101                         3005, 3012, 3018, 3019, 3021, 3022, 3023, 3026, 3027,
 102 #if GMCS_SOURCE
 103                         402, 414, 693, 1058, 1700, 3024
 104 #endif
 105                 };
 106
 107                 static Report ()
 108                 {
 109                         // Just to be sure that binary search is working
 110                         Array.Sort (AllWarnings);
 111                 }
 112
 113                 public static void Reset ()
 114                 {
 115                         Errors = Warnings = 0;
 116                         WarningsAreErrors = false;
 117                         warning_ignore_table = null;
 118                         warning_regions_table = null;
 119                         reporting_disabled = false;
 120                 }
 121
 122                 public static void DisableReporting ()
 123                 {
 124                         if (error_stack == null)
 125                                 error_stack = new Stack ();
 126                         error_stack.Push (Errors);
 127                         reporting_disabled = true;
 128                 }
 129
 130                 public static void EnableReporting ()
 131                 {
 132                         Errors = (int) error_stack.Pop ();
 133                         if (error_stack.Count == 0) {
 134                                 reporting_disabled = false;
 135                         }
 136                 }
 137
 138                 abstract class AbstractMessage {
 139
 140                         static void Check (int code)
 141                         {
 142                                 if (code == expected_error) {
 143                                         Environment.Exit (0);
 144                                 }
 145                         }
 146
 147                         public abstract bool IsWarning { get; }
 148
 149                         public abstract string MessageType { get; }
 150
 151                         public virtual void Print (int code, Location location, string text)
 152                         {
 153                                 if (reporting_disabled) {
 154                                         //
 155                                         // This line is useful when debugging the inner working of
 156                                         // Lambdas when various compilation attempts are done.
 157                                         //
 158                                         //Console.WriteLine ("DISABLED: {0} {1} {2}", code, location, text);
 159                                         return;
 160                                 }
 161
 162                                 if (code < 0)
 163                                         code = 8000-code;
 164
 165                                 StringBuilder msg = new StringBuilder ();
 166                                 if (!location.IsNull) {
 167                                         msg.Append (location.ToString ());
 168                                         msg.Append (' ');
 169                                 }
 170                                 msg.AppendFormat ("{0} CS{1:0000}: {2}", MessageType, code, text);
 171                                 Stderr.WriteLine (msg.ToString ());
 172
 173                                 foreach (string s in extra_information)
 174                                         Stderr.WriteLine (s + MessageType + ")");
 175
 176                                 extra_information.Clear ();
 177
 178                                 if (Stacktrace)
 179                                         Console.WriteLine (FriendlyStackTrace (new StackTrace (true)));
 180
 181                                 if (Fatal) {
 182                                         if (!IsWarning || WarningsAreErrors)
 183                                                 throw new Exception (text);
 184                                 }
 185
 186                                 Check (code);
 187                         }
 188                 }
 189
 190                 sealed class WarningMessage : AbstractMessage {
 191                         readonly int Level;
 192
 193                         public WarningMessage (int level)
 194                         {
 195                                 Level = level;
 196                         }
 197
 198                         public override bool IsWarning {
 199                                 get { return true; }
 200                         }
 201
 202                         bool IsEnabled (int code, Location loc)
 203                         {
 204                                 if (WarningLevel < Level)
 205                                         return false;
 206
 207                                 if (warning_ignore_table != null) {
 208                                         if (warning_ignore_table.Contains (code)) {
 209                                                 return false;
 210                                         }
 211                                 }
 212
 213                                 if (warning_regions_table == null || loc.IsNull)
 214                                         return true;
 215
 216                                 WarningRegions regions = (WarningRegions)warning_regions_table [loc.Name];
 217                                 if (regions == null)
 218                                         return true;
 219
 220                                 return regions.IsWarningEnabled (code, loc.Row);
 221                         }
 222
 223                         public override void Print (int code, Location location, string text)
 224                         {
 225                                 if (!IsEnabled (code, location)) {
 226                                         extra_information.Clear ();
 227                                         return;
 228                                 }
 229
 230                                 if (WarningsAreErrors) {
 231                                         new ErrorMessage ().Print (code, location, text);
 232                                         return;
 233                                 }
 234
 235                                 Warnings++;
 236                                 base.Print (code, location, text);
 237                         }
 238
 239                         public override string MessageType {
 240                                 get {
 241                                         return "warning";
 242                                 }
 243                         }
 244                 }
 245
 246                 sealed class ErrorMessage : AbstractMessage {
 247
 248                         public override void Print(int code, Location location, string text)
 249                         {
 250                                 Errors++;
 251                                 base.Print (code, location, text);
 252                         }
 253
 254                         public override bool IsWarning {
 255                                 get { return false; }
 256                         }
 257
 258                         public override string MessageType {
 259                                 get {
 260                                         return "error";
 261                                 }
 262                         }
 263
 264                 }
 265
 266                 public static void FeatureIsNotISO1 (Location loc, string feature)
 267                 {
 268                         Report.Error (1644, loc,
 269                                 "Feature `{0}' cannot be used because it is not part of the C# 1.0 language specification",
 270                                       feature);
 271                 }
 272
 273                 public static void FeatureRequiresLINQ (Location loc, string feature)
 274                 {
 275                         Report.Error (1644, loc,
 276                                       "Feature `{0}' can only be used if the language level is LINQ", feature);
 277                 }
 278
 279                 public static string FriendlyStackTrace (Exception e)
 280                 {
 281                         return FriendlyStackTrace (new StackTrace (e, true));
 282                 }
 283
 284                 static string FriendlyStackTrace (StackTrace t)
 285                 {
 286                         StringBuilder sb = new StringBuilder ();
 287
 288                         bool foundUserCode = false;
 289
 290                         for (int i = 0; i < t.FrameCount; i++) {
 291                                 StackFrame f = t.GetFrame (i);
 292                                 MethodBase mb = f.GetMethod ();
 293
 294                                 if (!foundUserCode && mb.ReflectedType == typeof (Report))
 295                                         continue;
 296
 297                                 foundUserCode = true;
 298
 299                                 sb.Append ("\tin ");
 300
 301                                 if (f.GetFileLineNumber () > 0)
 302                                         sb.AppendFormat ("(at {0}:{1}) ", f.GetFileName (), f.GetFileLineNumber ());
 303
 304                                 sb.AppendFormat ("{0}.{1} (", mb.ReflectedType.Name, mb.Name);
 305
 306                                 bool first = true;
 307                                 foreach (ParameterInfo pi in mb.GetParameters ()) {
 308                                         if (!first)
 309                                                 sb.Append (", ");
 310                                         first = false;
 311
 312                                         sb.Append (TypeManager.CSharpName (pi.ParameterType));
 313                                 }
 314                                 sb.Append (")\n");
 315                         }
 316
 317                         return sb.ToString ();
 318                 }
 319
 320                 public static void StackTrace ()
 321                 {
 322                         Console.WriteLine (FriendlyStackTrace (new StackTrace (true)));
 323                 }
 324
 325                 public static bool IsValidWarning (int code)
 326                 {
 327                         return Array.BinarySearch (AllWarnings, code) >= 0;
 328                 }
 329
 330                 static public void RuntimeMissingSupport (Location loc, string feature)
 331                 {
 332                         Report.Error (-88, loc, "Your .NET Runtime does not support `{0}'. Please use the latest Mono runtime instead.", feature);
 333                 }
 334
 335                 /// <summary>
 336                 /// In most error cases is very useful to have information about symbol that caused the error.
 337                 /// Call this method before you call Report.Error when it makes sense.
 338                 /// </summary>
 339                 static public void SymbolRelatedToPreviousError (Location loc, string symbol)
 340                 {
 341                         SymbolRelatedToPreviousError (loc.ToString (), symbol);
 342                 }
 343
 344                 static public void SymbolRelatedToPreviousError (MemberInfo mi)
 345                 {
 346                         if (reporting_disabled)
 347                                 return;
 348
 349                         Type dt = TypeManager.DropGenericTypeArguments (mi.DeclaringType);
 350                         DeclSpace temp_ds = TypeManager.LookupDeclSpace (dt);
 351                         if (temp_ds == null) {
 352                                 SymbolRelatedToPreviousError (dt.Assembly.Location, TypeManager.GetFullNameSignature (mi));
 353                         } else {
 354                                 MethodBase mb = mi as MethodBase;
 355                                 if (mb != null) {
 356                                         mb = TypeManager.DropGenericMethodArguments (mb);
 357                                         IMethodData md = TypeManager.GetMethod (mb);
 358                                         SymbolRelatedToPreviousError (md.Location, md.GetSignatureForError ());
 359                                         return;
 360                                 }
 361
 362                                 MemberCore mc = temp_ds.GetDefinition (mi.Name);
 363                                 SymbolRelatedToPreviousError (mc);
 364                         }
 365                 }
 366
 367                 static public void SymbolRelatedToPreviousError (MemberCore mc)
 368                 {
 369                         SymbolRelatedToPreviousError (mc.Location, mc.GetSignatureForError ());
 370                 }
 371
 372                 static public void SymbolRelatedToPreviousError (Type type)
 373                 {
 374                         if (reporting_disabled)
 375                                 return;
 376
 377                         type = TypeManager.DropGenericTypeArguments (type);
 378
 379                         if (TypeManager.IsGenericParameter (type)) {
 380                                 TypeParameter tp = TypeManager.LookupTypeParameter (type);
 381                                 if (tp != null) {
 382                                         SymbolRelatedToPreviousError (tp.Location, "");
 383                                         return;
 384                                 }
 385                         }
 386
 387                         if (type is TypeBuilder) {
 388                                 DeclSpace temp_ds = TypeManager.LookupDeclSpace (type);
 389                                 SymbolRelatedToPreviousError (temp_ds.Location, TypeManager.CSharpName (type));
 390                         } else if (type.HasElementType) {
 391                                 SymbolRelatedToPreviousError (type.GetElementType ());
 392                         } else {
 393                                 SymbolRelatedToPreviousError (type.Assembly.Location, TypeManager.CSharpName (type));
 394                         }
 395                 }
 396
 397                 static void SymbolRelatedToPreviousError (string loc, string symbol)
 398                 {
 399                         extra_information.Add (String.Format ("{0} (Location of the symbol related to previous ", loc));
 400                 }
 401
 402                 public static void ExtraInformation (Location loc, string msg)
 403                 {
 404                         if (reporting_disabled)
 405                                 return;
 406
 407                         extra_information.Add (String.Format ("{0} {1}", loc, msg));
 408                 }
 409
 410                 public static WarningRegions RegisterWarningRegion (Location location)
 411                 {
 412                         if (warning_regions_table == null)
 413                                 warning_regions_table = new Hashtable ();
 414
 415                         WarningRegions regions = (WarningRegions)warning_regions_table [location.Name];
 416                         if (regions == null) {
 417                                 regions = new WarningRegions ();
 418                                 warning_regions_table.Add (location.Name, regions);
 419                         }
 420                         return regions;
 421                 }
 422
 423                 static public void Warning (int code, int level, Location loc, string message)
 424                 {
 425                         WarningMessage w = new WarningMessage (level);
 426                         w.Print (code, loc, message);
 427                 }
 428
 429                 static public void Warning (int code, int level, Location loc, string format, string arg)
 430                 {
 431                         WarningMessage w = new WarningMessage (level);
 432                         w.Print (code, loc, String.Format (format, arg));
 433                 }
 434
 435                 static public void Warning (int code, int level, Location loc, string format, string arg1, string arg2)
 436                 {
 437                         WarningMessage w = new WarningMessage (level);
 438                         w.Print (code, loc, String.Format (format, arg1, arg2));
 439                 }
 440
 441                 static public void Warning (int code, int level, Location loc, string format, params string[] args)
 442                 {
 443                         WarningMessage w = new WarningMessage (level);
 444                         w.Print (code, loc, String.Format (format, args));
 445                 }
 446
 447                 static public void Warning (int code, int level, string message)
 448                 {
 449                         Warning (code, level, Location.Null, message);
 450                 }
 451
 452                 static public void Warning (int code, int level, string format, string arg)
 453                 {
 454                         Warning (code, level, Location.Null, format, arg);
 455                 }
 456
 457                 static public void Warning (int code, int level, string format, string arg1, string arg2)
 458                 {
 459                         Warning (code, level, Location.Null, format, arg1, arg2);
 460                 }
 461
 462                 static public void Warning (int code, int level, string format, params string[] args)
 463                 {
 464                         Warning (code, level, Location.Null, String.Format (format, args));
 465                 }
 466
 467                 static public void Error (int code, Location loc, string error)
 468                 {
 469                         new ErrorMessage ().Print (code, loc, error);
 470                 }
 471
 472                 static public void Error (int code, Location loc, string format, string arg)
 473                 {
 474                         new ErrorMessage ().Print (code, loc, String.Format (format, arg));
 475                 }
 476
 477                 static public void Error (int code, Location loc, string format, string arg1, string arg2)
 478                 {
 479                         new ErrorMessage ().Print (code, loc, String.Format (format, arg1, arg2));
 480                 }
 481
 482                 static public void Error (int code, Location loc, string format, params string[] args)
 483                 {
 484                         Error (code, loc, String.Format (format, args));
 485                 }
 486
 487                 static public void Error (int code, string error)
 488                 {
 489                         Error (code, Location.Null, error);
 490                 }
 491
 492                 static public void Error (int code, string format, string arg)
 493                 {
 494                         Error (code, Location.Null, format, arg);
 495                 }
 496
 497                 static public void Error (int code, string format, string arg1, string arg2)
 498                 {
 499                         Error (code, Location.Null, format, arg1, arg2);
 500                 }
 501
 502                 static public void Error (int code, string format, params string[] args)
 503                 {
 504                         Error (code, Location.Null, String.Format (format, args));
 505                 }
 506
 507                 static public void SetIgnoreWarning (int code)
 508                 {
 509                         if (warning_ignore_table == null)
 510                                 warning_ignore_table = new Hashtable ();
 511
 512                         warning_ignore_table [code] = true;
 513                 }
 514
 515                 static public int ExpectedError {
 516                         set {
 517                                 expected_error = value;
 518                         }
 519                         get {
 520                                 return expected_error;
 521                         }
 522                 }
 523
 524                 public static int WarningLevel {
 525                         get {
 526                                 if (reporting_disabled)
 527                                         return 0;
 528
 529                                 return warning_level;
 530                         }
 531                         set {
 532                                 warning_level = value;
 533                         }
 534                 }
 535
 536                 public static int DebugFlags = 0;
 537
 538                 [Conditional ("MCS_DEBUG")]
 539                 static public void Debug (string message, params object[] args)
 540                 {
 541                         Debug (4, message, args);
 542                 }
 543
 544                 [Conditional ("MCS_DEBUG")]
 545                 static public void Debug (int category, string message, params object[] args)
 546                 {
 547                         if ((category & DebugFlags) == 0)
 548                                 return;
 549
 550                         StringBuilder sb = new StringBuilder (message);
 551
 552                         if ((args != null) && (args.Length > 0)) {
 553                                 sb.Append (": ");
 554
 555                                 bool first = true;
 556                                 foreach (object arg in args) {
 557                                         if (first)
 558                                                 first = false;
 559                                         else
 560                                                 sb.Append (", ");
 561                                         if (arg == null)
 562                                                 sb.Append ("null");
 563                                         else if (arg is ICollection)
 564                                                 sb.Append (PrintCollection ((ICollection) arg));
 565                                         else
 566                                                 sb.Append (arg);
 567                                 }
 568                         }
 569
 570                         Console.WriteLine (sb.ToString ());
 571                 }
 572
 573                 static public string PrintCollection (ICollection collection)
 574                 {
 575                         StringBuilder sb = new StringBuilder ();
 576
 577                         sb.Append (collection.GetType ());
 578                         sb.Append ("(");
 579
 580                         bool first = true;
 581                         foreach (object o in collection) {
 582                                 if (first)
 583                                         first = false;
 584                                 else
 585                                         sb.Append (", ");
 586                                 sb.Append (o);
 587                         }
 588
 589                         sb.Append (")");
 590                         return sb.ToString ();
 591                 }
 592         }
 593
 594         public enum TimerType {
 595                 FindMembers     = 0,
 596                 TcFindMembers   = 1,
 597                 MemberLookup    = 2,
 598                 CachedLookup    = 3,
 599                 CacheInit       = 4,
 600                 MiscTimer       = 5,
 601                 CountTimers     = 6
 602         }
 603
 604         public enum CounterType {
 605                 FindMembers     = 0,
 606                 MemberCache     = 1,
 607                 MiscCounter     = 2,
 608                 CountCounters   = 3
 609         }
 610
 611         public class Timer
 612         {
 613                 static DateTime[] timer_start;
 614                 static TimeSpan[] timers;
 615                 static long[] timer_counters;
 616                 static long[] counters;
 617
 618                 static Timer ()
 619                 {
 620                         timer_start = new DateTime [(int) TimerType.CountTimers];
 621                         timers = new TimeSpan [(int) TimerType.CountTimers];
 622                         timer_counters = new long [(int) TimerType.CountTimers];
 623                         counters = new long [(int) CounterType.CountCounters];
 624
 625                         for (int i = 0; i < (int) TimerType.CountTimers; i++) {
 626                                 timer_start [i] = DateTime.Now;
 627                                 timers [i] = TimeSpan.Zero;
 628                         }
 629                 }
 630
 631                 [Conditional("TIMER")]
 632                 static public void IncrementCounter (CounterType which)
 633                 {
 634                         ++counters [(int) which];
 635                 }
 636
 637                 [Conditional("TIMER")]
 638                 static public void StartTimer (TimerType which)
 639                 {
 640                         timer_start [(int) which] = DateTime.Now;
 641                 }
 642
 643                 [Conditional("TIMER")]
 644                 static public void StopTimer (TimerType which)
 645                 {
 646                         timers [(int) which] += DateTime.Now - timer_start [(int) which];
 647                         ++timer_counters [(int) which];
 648                 }
 649
 650                 [Conditional("TIMER")]
 651                 static public void ShowTimers ()
 652                 {
 653                         ShowTimer (TimerType.FindMembers, "- FindMembers timer");
 654                         ShowTimer (TimerType.TcFindMembers, "- TypeContainer.FindMembers timer");
 655                         ShowTimer (TimerType.MemberLookup, "- MemberLookup timer");
 656                         ShowTimer (TimerType.CachedLookup, "- CachedLookup timer");
 657                         ShowTimer (TimerType.CacheInit, "- Cache init");
 658                         ShowTimer (TimerType.MiscTimer, "- Misc timer");
 659
 660                         ShowCounter (CounterType.FindMembers, "- Find members");
 661                         ShowCounter (CounterType.MemberCache, "- Member cache");
 662                         ShowCounter (CounterType.MiscCounter, "- Misc counter");
 663                 }
 664
 665                 static public void ShowCounter (CounterType which, string msg)
 666                 {
 667                         Console.WriteLine ("{0} {1}", counters [(int) which], msg);
 668                 }
 669
 670                 static public void ShowTimer (TimerType which, string msg)
 671                 {
 672                         Console.WriteLine (
 673                                 "[{0:00}:{1:000}] {2} (used {3} times)",
 674                                 (int) timers [(int) which].TotalSeconds,
 675                                 timers [(int) which].Milliseconds, msg,
 676                                 timer_counters [(int) which]);
 677                 }
 678         }
 679
 680         public class InternalErrorException : Exception {
 681                 public InternalErrorException (MemberCore mc, Exception e)
 682                         : base (mc.Location + " " + mc.GetSignatureForError (), e)
 683                 {
 684                 }
 685
 686                 public InternalErrorException ()
 687                         : base ("Internal error")
 688                 {
 689                 }
 690
 691                 public InternalErrorException (string message)
 692                         : base (message)
 693                 {
 694                 }
 695
 696                 public InternalErrorException (string message, params object[] args)
 697                         : base (String.Format (message, args))
 698                 { }
 699         }
 700
 701         /// <summary>
 702         /// Handles #pragma warning
 703         /// </summary>
 704         public class WarningRegions {
 705
 706                 abstract class PragmaCmd
 707                 {
 708                         public int Line;
 709
 710                         protected PragmaCmd (int line)
 711                         {
 712                                 Line = line;
 713                         }
 714
 715                         public abstract bool IsEnabled (int code, bool previous);
 716                 }
 717
 718                 class Disable : PragmaCmd
 719                 {
 720                         int code;
 721                         public Disable (int line, int code)
 722                                 : base (line)
 723                         {
 724                                 this.code = code;
 725                         }
 726
 727                         public override bool IsEnabled (int code, bool previous)
 728                         {
 729                                 return this.code == code ? false : previous;
 730                         }
 731                 }
 732
 733                 class DisableAll : PragmaCmd
 734                 {
 735                         public DisableAll (int line)
 736                                 : base (line) {}
 737
 738                         public override bool IsEnabled(int code, bool previous)
 739                         {
 740                                 return false;
 741                         }
 742                 }
 743
 744                 class Enable : PragmaCmd
 745                 {
 746                         int code;
 747                         public Enable (int line, int code)
 748                                 : base (line)
 749                         {
 750                                 this.code = code;
 751                         }
 752
 753                         public override bool IsEnabled(int code, bool previous)
 754                         {
 755                                 return this.code == code ? true : previous;
 756                         }
 757                 }
 758
 759                 class EnableAll : PragmaCmd
 760                 {
 761                         public EnableAll (int line)
 762                                 : base (line) {}
 763
 764                         public override bool IsEnabled(int code, bool previous)
 765                         {
 766                                 return true;
 767                         }
 768                 }
 769
 770
 771                 ArrayList regions = new ArrayList ();
 772
 773                 public void WarningDisable (int line)
 774                 {
 775                         regions.Add (new DisableAll (line));
 776                 }
 777
 778                 public void WarningDisable (Location location, int code)
 779                 {
 780                         if (CheckWarningCode (code, location))
 781                                 regions.Add (new Disable (location.Row, code));
 782                 }
 783
 784                 public void WarningEnable (int line)
 785                 {
 786                         regions.Add (new EnableAll (line));
 787                 }
 788
 789                 public void WarningEnable (Location location, int code)
 790                 {
 791                         if (CheckWarningCode (code, location))
 792                                 regions.Add (new Enable (location.Row, code));
 793                 }
 794
 795                 public bool IsWarningEnabled (int code, int src_line)
 796                 {
 797                         bool result = true;
 798                         foreach (PragmaCmd pragma in regions) {
 799                                 if (src_line < pragma.Line)
 800                                         break;
 801
 802                                 result = pragma.IsEnabled (code, result);
 803                         }
 804                         return result;
 805                 }
 806
 807                 static bool CheckWarningCode (int code, Location loc)
 808                 {
 809                         if (Report.IsValidWarning (code))
 810                                 return true;
 811
 812                         Report.Warning (1691, 1, loc, "`{0}' is not a valid warning number", code.ToString ());
 813                         return false;
 814                 }
 815         }
 816 }