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@gmail.com)
   6 //
   7 // Copyright 2001 Ximian, Inc. (http://www.ximian.com)
   8 // Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
   9 //
  10
  11 using System;
  12 using System.IO;
  13 using System.Text;
  14 using System.Collections.Generic;
  15 using System.Diagnostics;
  16
  17 namespace Mono.CSharp {
  18
  19         //
  20         // Errors and warnings manager
  21         //
  22         public class Report
  23         {
  24                 public const int RuntimeErrorId = 10000;
  25
  26                 Dictionary<int, WarningRegions> warning_regions_table;
  27
  28                 ReportPrinter printer;
  29
  30                 int reporting_disabled;
  31
  32                 readonly CompilerSettings settings;
  33
  34                 /// <summary>
  35                 /// List of symbols related to reported error/warning. You have to fill it before error/warning is reported.
  36                 /// </summary>
  37                 List<string> extra_information = new List<string> ();
  38
  39                 //
  40                 // IF YOU ADD A NEW WARNING YOU HAVE TO ADD ITS ID HERE
  41                 //
  42                 public static readonly int[] AllWarnings = new int[] {
  43                         28, 67, 78,
  44                         105, 108, 109, 114, 162, 164, 168, 169, 183, 184, 197,
  45                         219, 251, 252, 253, 278, 282,
  46                         402, 414, 419, 420, 429, 436, 437, 440, 458, 464, 465, 467, 469, 472, 473,
  47                         612, 618, 626, 628, 642, 649, 652, 657, 658, 659, 660, 661, 665, 672, 675, 693,
  48                         728,
  49                         809, 824,
  50                         1030, 1058, 1060, 1066,
  51                         1522, 1570, 1571, 1572, 1573, 1574, 1580, 1581, 1584, 1587, 1589, 1590, 1591, 1592,
  52                         1607, 1616, 1633, 1634, 1635, 1685, 1690, 1691, 1692, 1695, 1696, 1699,
  53                         1700, 1701, 1702, 1709, 1711, 1717, 1718, 1720, 1735,
  54                         1901, 1956, 1981, 1998,
  55                         2002, 2023, 2029,
  56                         3000, 3001, 3002, 3003, 3005, 3006, 3007, 3008, 3009,
  57                         3010, 3011, 3012, 3013, 3014, 3015, 3016, 3017, 3018, 3019,
  58                         3021, 3022, 3023, 3024, 3026, 3027
  59                 };
  60
  61                 static HashSet<int> AllWarningsHashSet;
  62
  63                 public Report (CompilerContext context, ReportPrinter printer)
  64                 {
  65                         if (context == null)
  66                                 throw new ArgumentNullException ("settings");
  67                         if (printer == null)
  68                                 throw new ArgumentNullException ("printer");
  69
  70                         this.settings = context.Settings;
  71                         this.printer = printer;
  72                 }
  73
  74                 public void DisableReporting ()
  75                 {
  76                         ++reporting_disabled;
  77                 }
  78
  79                 public void EnableReporting ()
  80                 {
  81                         --reporting_disabled;
  82                 }
  83
  84                 public void FeatureIsNotAvailable (CompilerContext compiler, Location loc, string feature)
  85                 {
  86                         string version;
  87                         switch (compiler.Settings.Version) {
  88                         case LanguageVersion.ISO_1:
  89                                 version = "1.0";
  90                                 break;
  91                         case LanguageVersion.ISO_2:
  92                                 version = "2.0";
  93                                 break;
  94                         case LanguageVersion.V_3:
  95                                 version = "3.0";
  96                                 break;
  97                         case LanguageVersion.V_4:
  98                                 version = "4.0";
  99                                 break;
 100                         case LanguageVersion.V_5:
 101                                 version = "5.0";
 102                                 break;
 103                         default:
 104                                 throw new InternalErrorException ("Invalid feature version", compiler.Settings.Version);
 105                         }
 106
 107                         Error (1644, loc,
 108                                 "Feature `{0}' cannot be used because it is not part of the C# {1} language specification",
 109                                       feature, version);
 110                 }
 111
 112                 public void FeatureIsNotSupported (Location loc, string feature)
 113                 {
 114                         Error (1644, loc,
 115                                 "Feature `{0}' is not supported in Mono mcs1 compiler. Consider using the `gmcs' compiler instead",
 116                                 feature);
 117                 }
 118
 119                 public void RuntimeMissingSupport (Location loc, string feature)
 120                 {
 121                         Error (-88, loc, "Your .NET Runtime does not support `{0}'. Please use the latest Mono runtime instead.", feature);
 122                 }
 123
 124                 /// <summary>
 125                 /// In most error cases is very useful to have information about symbol that caused the error.
 126                 /// Call this method before you call Report.Error when it makes sense.
 127                 /// </summary>
 128                 public void SymbolRelatedToPreviousError (Location loc, string symbol)
 129                 {
 130                         SymbolRelatedToPreviousError (loc.ToString ());
 131                 }
 132
 133                 public void SymbolRelatedToPreviousError (MemberSpec ms)
 134                 {
 135                         if (reporting_disabled > 0 || !printer.HasRelatedSymbolSupport)
 136                                 return;
 137
 138                         var mc = ms.MemberDefinition as MemberCore;
 139                         while (ms is ElementTypeSpec) {
 140                                 ms = ((ElementTypeSpec) ms).Element;
 141                                 mc = ms.MemberDefinition as MemberCore;
 142                         }
 143
 144                         if (mc != null) {
 145                                 SymbolRelatedToPreviousError (mc);
 146                         } else {
 147                                 if (ms.DeclaringType != null)
 148                                         ms = ms.DeclaringType;
 149
 150                                 var imported_type = ms.MemberDefinition as ImportedTypeDefinition;
 151                                 if (imported_type != null) {
 152                                         var iad = imported_type.DeclaringAssembly as ImportedAssemblyDefinition;
 153                                         SymbolRelatedToPreviousError (iad.Location);
 154                                 }
 155                         }
 156                 }
 157
 158                 public void SymbolRelatedToPreviousError (MemberCore mc)
 159                 {
 160                         SymbolRelatedToPreviousError (mc.Location, mc.GetSignatureForError ());
 161                 }
 162
 163                 public void SymbolRelatedToPreviousError (string loc)
 164                 {
 165                         string msg = String.Format ("{0} (Location of the symbol related to previous ", loc);
 166                         if (extra_information.Contains (msg))
 167                                 return;
 168
 169                         extra_information.Add (msg);
 170                 }
 171
 172                 public bool CheckWarningCode (string code, Location loc)
 173                 {
 174                         Warning (1691, 1, loc, "`{0}' is not a valid warning number", code);
 175                         return false;
 176                 }
 177
 178                 public bool CheckWarningCode (int code, Location loc)
 179                 {
 180                         if (AllWarningsHashSet == null)
 181                                 AllWarningsHashSet = new HashSet<int> (AllWarnings);
 182
 183                         if (AllWarningsHashSet.Contains (code))
 184                                 return true;
 185
 186                         return CheckWarningCode (code.ToString (), loc);
 187                 }
 188
 189                 public void ExtraInformation (Location loc, string msg)
 190                 {
 191                         extra_information.Add (String.Format ("{0} {1}", loc, msg));
 192                 }
 193
 194                 public WarningRegions RegisterWarningRegion (Location location)
 195                 {
 196                         WarningRegions regions;
 197                         if (warning_regions_table == null) {
 198                                 regions = null;
 199                                 warning_regions_table = new Dictionary<int, WarningRegions> ();
 200                         } else {
 201                                 warning_regions_table.TryGetValue (location.File, out regions);
 202                         }
 203
 204                         if (regions == null) {
 205                                 regions = new WarningRegions ();
 206                                 warning_regions_table.Add (location.File, regions);
 207                         }
 208
 209                         return regions;
 210                 }
 211
 212                 public void Warning (int code, int level, Location loc, string message)
 213                 {
 214                         if (reporting_disabled > 0)
 215                                 return;
 216
 217                         if (!settings.IsWarningEnabled (code, level))
 218                                 return;
 219
 220                         if (warning_regions_table != null && !loc.IsNull) {
 221                                 WarningRegions regions;
 222                                 if (warning_regions_table.TryGetValue (loc.File, out regions) && !regions.IsWarningEnabled (code, loc.Row))
 223                                         return;
 224                         }
 225
 226                         AbstractMessage msg;
 227                         if (settings.IsWarningAsError (code)) {
 228                                 message = "Warning as Error: " + message;
 229                                 msg = new ErrorMessage (code, loc, message, extra_information);
 230                         } else {
 231                                 msg = new WarningMessage (code, loc, message, extra_information);
 232                         }
 233
 234                         extra_information.Clear ();
 235                         printer.Print (msg, settings.ShowFullPaths);
 236                 }
 237
 238                 public void Warning (int code, int level, Location loc, string format, string arg)
 239                 {
 240                         Warning (code, level, loc, String.Format (format, arg));
 241                 }
 242
 243                 public void Warning (int code, int level, Location loc, string format, string arg1, string arg2)
 244                 {
 245                         Warning (code, level, loc, String.Format (format, arg1, arg2));
 246                 }
 247
 248                 public void Warning (int code, int level, Location loc, string format, params object[] args)
 249                 {
 250                         Warning (code, level, loc, String.Format (format, args));
 251                 }
 252
 253                 public void Warning (int code, int level, string message)
 254                 {
 255                         Warning (code, level, Location.Null, message);
 256                 }
 257
 258                 public void Warning (int code, int level, string format, string arg)
 259                 {
 260                         Warning (code, level, Location.Null, format, arg);
 261                 }
 262
 263                 public void Warning (int code, int level, string format, string arg1, string arg2)
 264                 {
 265                         Warning (code, level, Location.Null, format, arg1, arg2);
 266                 }
 267
 268                 public void Warning (int code, int level, string format, params string[] args)
 269                 {
 270                         Warning (code, level, Location.Null, String.Format (format, args));
 271                 }
 272
 273                 //
 274                 // Warnings encountered so far
 275                 //
 276                 public int Warnings {
 277                         get { return printer.WarningsCount; }
 278                 }
 279
 280                 public void Error (int code, Location loc, string error)
 281                 {
 282                         if (reporting_disabled > 0)
 283                                 return;
 284
 285                         ErrorMessage msg = new ErrorMessage (code, loc, error, extra_information);
 286                         extra_information.Clear ();
 287
 288                         printer.Print (msg, settings.ShowFullPaths);
 289
 290                         if (settings.Stacktrace)
 291                                 Console.WriteLine (FriendlyStackTrace (new StackTrace (true)));
 292
 293                         if (printer.ErrorsCount == settings.FatalCounter)
 294                                 throw new FatalException (msg.Text);
 295                 }
 296
 297                 public void Error (int code, Location loc, string format, string arg)
 298                 {
 299                         Error (code, loc, String.Format (format, arg));
 300                 }
 301
 302                 public void Error (int code, Location loc, string format, string arg1, string arg2)
 303                 {
 304                         Error (code, loc, String.Format (format, arg1, arg2));
 305                 }
 306
 307                 public void Error (int code, Location loc, string format, params string[] args)
 308                 {
 309                         Error (code, loc, String.Format (format, args));
 310                 }
 311
 312                 public void Error (int code, string error)
 313                 {
 314                         Error (code, Location.Null, error);
 315                 }
 316
 317                 public void Error (int code, string format, string arg)
 318                 {
 319                         Error (code, Location.Null, format, arg);
 320                 }
 321
 322                 public void Error (int code, string format, string arg1, string arg2)
 323                 {
 324                         Error (code, Location.Null, format, arg1, arg2);
 325                 }
 326
 327                 public void Error (int code, string format, params string[] args)
 328                 {
 329                         Error (code, Location.Null, String.Format (format, args));
 330                 }
 331
 332                 //
 333                 // Errors encountered so far
 334                 //
 335                 public int Errors {
 336                         get { return printer.ErrorsCount; }
 337                 }
 338
 339                 public bool IsDisabled {
 340                         get {
 341                                 return reporting_disabled > 0;
 342                         }
 343                 }
 344
 345                 public ReportPrinter Printer {
 346                         get { return printer; }
 347                 }
 348
 349                 public ReportPrinter SetPrinter (ReportPrinter printer)
 350                 {
 351                         ReportPrinter old = this.printer;
 352                         this.printer = printer;
 353                         return old;
 354                 }
 355
 356                 [Conditional ("MCS_DEBUG")]
 357                 static public void Debug (string message, params object[] args)
 358                 {
 359                         Debug (4, message, args);
 360                 }
 361
 362                 [Conditional ("MCS_DEBUG")]
 363                 static public void Debug (int category, string message, params object[] args)
 364                 {
 365 //                      if ((category & DebugFlags) == 0)
 366 //                              return;
 367
 368                         StringBuilder sb = new StringBuilder (message);
 369
 370                         if ((args != null) && (args.Length > 0)) {
 371                                 sb.Append (": ");
 372
 373                                 bool first = true;
 374                                 foreach (object arg in args) {
 375                                         if (first)
 376                                                 first = false;
 377                                         else
 378                                                 sb.Append (", ");
 379                                         if (arg == null)
 380                                                 sb.Append ("null");
 381 //                                      else if (arg is ICollection)
 382 //                                              sb.Append (PrintCollection ((ICollection) arg));
 383                                         else
 384                                                 sb.Append (arg);
 385                                 }
 386                         }
 387
 388                         Console.WriteLine (sb.ToString ());
 389                 }
 390 /*
 391                 static public string PrintCollection (ICollection collection)
 392                 {
 393                         StringBuilder sb = new StringBuilder ();
 394
 395                         sb.Append (collection.GetType ());
 396                         sb.Append ("(");
 397
 398                         bool first = true;
 399                         foreach (object o in collection) {
 400                                 if (first)
 401                                         first = false;
 402                                 else
 403                                         sb.Append (", ");
 404                                 sb.Append (o);
 405                         }
 406
 407                         sb.Append (")");
 408                         return sb.ToString ();
 409                 }
 410 */
 411                 static string FriendlyStackTrace (StackTrace t)
 412                 {
 413                         StringBuilder sb = new StringBuilder ();
 414
 415                         bool foundUserCode = false;
 416
 417                         for (int i = 0; i < t.FrameCount; i++) {
 418                                 StackFrame f = t.GetFrame (i);
 419                                 var mb = f.GetMethod ();
 420
 421                                 if (!foundUserCode && mb.ReflectedType == typeof (Report))
 422                                         continue;
 423
 424                                 foundUserCode = true;
 425
 426                                 sb.Append ("\tin ");
 427
 428                                 if (f.GetFileLineNumber () > 0)
 429                                         sb.AppendFormat ("(at {0}:{1}) ", f.GetFileName (), f.GetFileLineNumber ());
 430
 431                                 sb.AppendFormat ("{0}.{1} (", mb.ReflectedType.Name, mb.Name);
 432
 433                                 bool first = true;
 434                                 foreach (var pi in mb.GetParameters ()) {
 435                                         if (!first)
 436                                                 sb.Append (", ");
 437                                         first = false;
 438
 439                                         sb.Append (pi.ParameterType.FullName);
 440                                 }
 441                                 sb.Append (")\n");
 442                         }
 443
 444                         return sb.ToString ();
 445                 }
 446         }
 447
 448         public abstract class AbstractMessage
 449         {
 450                 readonly string[] extra_info;
 451                 protected readonly int code;
 452                 protected readonly Location location;
 453                 readonly string message;
 454
 455                 protected AbstractMessage (int code, Location loc, string msg, List<string> extraInfo)
 456                 {
 457                         this.code = code;
 458                         if (code < 0)
 459                                 this.code = 8000 - code;
 460
 461                         this.location = loc;
 462                         this.message = msg;
 463                         if (extraInfo.Count != 0) {
 464                                 this.extra_info = extraInfo.ToArray ();
 465                         }
 466                 }
 467
 468                 protected AbstractMessage (AbstractMessage aMsg)
 469                 {
 470                         this.code = aMsg.code;
 471                         this.location = aMsg.location;
 472                         this.message = aMsg.message;
 473                         this.extra_info = aMsg.extra_info;
 474                 }
 475
 476                 public int Code {
 477                         get { return code; }
 478                 }
 479
 480                 public override bool Equals (object obj)
 481                 {
 482                         AbstractMessage msg = obj as AbstractMessage;
 483                         if (msg == null)
 484                                 return false;
 485
 486                         return code == msg.code && location.Equals (msg.location) && message == msg.message;
 487                 }
 488
 489                 public override int GetHashCode ()
 490                 {
 491                         return code.GetHashCode ();
 492                 }
 493
 494                 public abstract bool IsWarning { get; }
 495
 496                 public Location Location {
 497                         get { return location; }
 498                 }
 499
 500                 public abstract string MessageType { get; }
 501
 502                 public string[] RelatedSymbols {
 503                         get { return extra_info; }
 504                 }
 505
 506                 public string Text {
 507                         get { return message; }
 508                 }
 509         }
 510
 511         sealed class WarningMessage : AbstractMessage
 512         {
 513                 public WarningMessage (int code, Location loc, string message, List<string> extra_info)
 514                         : base (code, loc, message, extra_info)
 515                 {
 516                 }
 517
 518                 public override bool IsWarning {
 519                         get { return true; }
 520                 }
 521
 522                 public override string MessageType {
 523                         get {
 524                                 return "warning";
 525                         }
 526                 }
 527         }
 528
 529         sealed class ErrorMessage : AbstractMessage
 530         {
 531                 public ErrorMessage (int code, Location loc, string message, List<string> extraInfo)
 532                         : base (code, loc, message, extraInfo)
 533                 {
 534                 }
 535
 536                 public ErrorMessage (AbstractMessage aMsg)
 537                         : base (aMsg)
 538                 {
 539                 }
 540
 541                 public override bool IsWarning {
 542                         get { return false; }
 543                 }
 544
 545                 public override string MessageType {
 546                         get {
 547                                 return "error";
 548                         }
 549                 }
 550         }
 551
 552         //
 553         // Generic base for any message writer
 554         //
 555         public abstract class ReportPrinter
 556         {
 557                 #region Properties
 558
 559                 public int ErrorsCount { get; protected set; }
 560
 561                 public int WarningsCount { get; private set; }
 562
 563                 //
 564                 // When (symbols related to previous ...) can be used
 565                 //
 566                 public virtual bool HasRelatedSymbolSupport {
 567                         get { return true; }
 568                 }
 569
 570                 #endregion
 571
 572
 573                 protected virtual string FormatText (string txt)
 574                 {
 575                         return txt;
 576                 }
 577
 578                 public virtual void Print (AbstractMessage msg, bool showFullPath)
 579                 {
 580                         if (msg.IsWarning) {
 581                                 ++WarningsCount;
 582                         } else {
 583                                 ++ErrorsCount;
 584                         }
 585                 }
 586
 587                 protected void Print (AbstractMessage msg, TextWriter output, bool showFullPath)
 588                 {
 589                         StringBuilder txt = new StringBuilder ();
 590                         if (!msg.Location.IsNull) {
 591                                 if (showFullPath)
 592                                         txt.Append (msg.Location.ToStringFullName ());
 593                                 else
 594                                         txt.Append (msg.Location.ToString ());
 595
 596                                 txt.Append (" ");
 597                         }
 598
 599                         txt.AppendFormat ("{0} CS{1:0000}: {2}", msg.MessageType, msg.Code, msg.Text);
 600
 601                         if (!msg.IsWarning)
 602                                 output.WriteLine (FormatText (txt.ToString ()));
 603                         else
 604                                 output.WriteLine (txt.ToString ());
 605
 606                         if (msg.RelatedSymbols != null) {
 607                                 foreach (string s in msg.RelatedSymbols)
 608                                         output.WriteLine (s + msg.MessageType + ")");
 609                         }
 610                 }
 611
 612                 public void Reset ()
 613                 {
 614                         // HACK: Temporary hack for broken repl flow
 615                         ErrorsCount = WarningsCount = 0;
 616                 }
 617         }
 618
 619         sealed class NullReportPrinter : ReportPrinter
 620         {
 621         }
 622
 623         //
 624         // Default message recorder, it uses two types of message groups.
 625         // Common messages: messages reported in all sessions.
 626         // Merged messages: union of all messages in all sessions.
 627         //
 628         // Used by the Lambda expressions to compile the code with various
 629         // parameter values, or by attribute resolver
 630         //
 631         class SessionReportPrinter : ReportPrinter
 632         {
 633                 List<AbstractMessage> session_messages;
 634                 //
 635                 // A collection of exactly same messages reported in all sessions
 636                 //
 637                 List<AbstractMessage> common_messages;
 638
 639                 //
 640                 // A collection of unique messages reported in all sessions
 641                 //
 642                 List<AbstractMessage> merged_messages;
 643
 644                 bool showFullPaths;
 645
 646                 public override void Print (AbstractMessage msg, bool showFullPath)
 647                 {
 648                         //
 649                         // This line is useful when debugging recorded messages
 650                         //
 651                         // Console.WriteLine ("RECORDING: {0}", msg.ToString ());
 652
 653                         if (session_messages == null)
 654                                 session_messages = new List<AbstractMessage> ();
 655
 656                         session_messages.Add (msg);
 657
 658                         this.showFullPaths = showFullPath;
 659                         base.Print (msg, showFullPath);
 660                 }
 661
 662                 public void EndSession ()
 663                 {
 664                         if (session_messages == null)
 665                                 return;
 666
 667                         //
 668                         // Handles the first session
 669                         //
 670                         if (common_messages == null) {
 671                                 common_messages = new List<AbstractMessage> (session_messages);
 672                                 merged_messages = session_messages;
 673                                 session_messages = null;
 674                                 return;
 675                         }
 676
 677                         //
 678                         // Store common messages if any
 679                         //
 680                         for (int i = 0; i < common_messages.Count; ++i) {
 681                                 AbstractMessage cmsg = common_messages[i];
 682                                 bool common_msg_found = false;
 683                                 foreach (AbstractMessage msg in session_messages) {
 684                                         if (cmsg.Equals (msg)) {
 685                                                 common_msg_found = true;
 686                                                 break;
 687                                         }
 688                                 }
 689
 690                                 if (!common_msg_found)
 691                                         common_messages.RemoveAt (i);
 692                         }
 693
 694                         //
 695                         // Merge session and previous messages
 696                         //
 697                         for (int i = 0; i < session_messages.Count; ++i) {
 698                                 AbstractMessage msg = session_messages[i];
 699                                 bool msg_found = false;
 700                                 for (int ii = 0; ii < merged_messages.Count; ++ii) {
 701                                         if (msg.Equals (merged_messages[ii])) {
 702                                                 msg_found = true;
 703                                                 break;
 704                                         }
 705                                 }
 706
 707                                 if (!msg_found)
 708                                         merged_messages.Add (msg);
 709                         }
 710                 }
 711
 712                 public bool IsEmpty {
 713                         get {
 714                                 return merged_messages == null && common_messages == null;
 715                         }
 716                 }
 717
 718                 //
 719                 // Prints collected messages, common messages have a priority
 720                 //
 721                 public bool Merge (ReportPrinter dest)
 722                 {
 723                         var messages_to_print = merged_messages;
 724                         if (common_messages != null && common_messages.Count > 0) {
 725                                 messages_to_print = common_messages;
 726                         }
 727
 728                         if (messages_to_print == null)
 729                                 return false;
 730
 731                         bool error_msg = false;
 732                         foreach (AbstractMessage msg in messages_to_print) {
 733                                 dest.Print (msg, showFullPaths);
 734                                 error_msg |= !msg.IsWarning;
 735                         }
 736
 737                         return error_msg;
 738                 }
 739         }
 740
 741         public class StreamReportPrinter : ReportPrinter
 742         {
 743                 readonly TextWriter writer;
 744
 745                 public StreamReportPrinter (TextWriter writer)
 746                 {
 747                         this.writer = writer;
 748                 }
 749
 750                 public override void Print (AbstractMessage msg, bool showFullPath)
 751                 {
 752                         Print (msg, writer, showFullPath);
 753                         base.Print (msg, showFullPath);
 754                 }
 755         }
 756
 757         public class ConsoleReportPrinter : StreamReportPrinter
 758         {
 759                 static readonly string prefix, postfix;
 760
 761                 static ConsoleReportPrinter ()
 762                 {
 763                         string term = Environment.GetEnvironmentVariable ("TERM");
 764                         bool xterm_colors = false;
 765
 766                         switch (term){
 767                         case "xterm":
 768                         case "rxvt":
 769                         case "rxvt-unicode":
 770                                 if (Environment.GetEnvironmentVariable ("COLORTERM") != null){
 771                                         xterm_colors = true;
 772                                 }
 773                                 break;
 774
 775                         case "xterm-color":
 776                         case "xterm-256color":
 777                                 xterm_colors = true;
 778                                 break;
 779                         }
 780                         if (!xterm_colors)
 781                                 return;
 782
 783                         if (!(UnixUtils.isatty (1) && UnixUtils.isatty (2)))
 784                                 return;
 785
 786                         string config = Environment.GetEnvironmentVariable ("MCS_COLORS");
 787                         if (config == null){
 788                                 config = "errors=red";
 789                                 //config = "brightwhite,red";
 790                         }
 791
 792                         if (config == "disable")
 793                                 return;
 794
 795                         if (!config.StartsWith ("errors="))
 796                                 return;
 797
 798                         config = config.Substring (7);
 799
 800                         int p = config.IndexOf (",");
 801                         if (p == -1)
 802                                 prefix = GetForeground (config);
 803                         else
 804                                 prefix = GetBackground (config.Substring (p+1)) + GetForeground (config.Substring (0, p));
 805                         postfix = "\x001b[0m";
 806                 }
 807
 808                 public ConsoleReportPrinter ()
 809                         : base (Console.Error)
 810                 {
 811                 }
 812
 813                 public ConsoleReportPrinter (TextWriter writer)
 814                         : base (writer)
 815                 {
 816                 }
 817
 818                 static int NameToCode (string s)
 819                 {
 820                         switch (s) {
 821                         case "black":
 822                                 return 0;
 823                         case "red":
 824                                 return 1;
 825                         case "green":
 826                                 return 2;
 827                         case "yellow":
 828                                 return 3;
 829                         case "blue":
 830                                 return 4;
 831                         case "magenta":
 832                                 return 5;
 833                         case "cyan":
 834                                 return 6;
 835                         case "grey":
 836                         case "white":
 837                                 return 7;
 838                         }
 839                         return 7;
 840                 }
 841
 842                 //
 843                 // maps a color name to its xterm color code
 844                 //
 845                 static string GetForeground (string s)
 846                 {
 847                         string highcode;
 848
 849                         if (s.StartsWith ("bright")) {
 850                                 highcode = "1;";
 851                                 s = s.Substring (6);
 852                         } else
 853                                 highcode = "";
 854
 855                         return "\x001b[" + highcode + (30 + NameToCode (s)).ToString () + "m";
 856                 }
 857
 858                 static string GetBackground (string s)
 859                 {
 860                         return "\x001b[" + (40 + NameToCode (s)).ToString () + "m";
 861                 }
 862
 863                 protected override string FormatText (string txt)
 864                 {
 865                         if (prefix != null)
 866                                 return prefix + txt + postfix;
 867
 868                         return txt;
 869                 }
 870         }
 871
 872         class TimeReporter
 873         {
 874                 public enum TimerType
 875                 {
 876                         ParseTotal,
 877                         AssemblyBuilderSetup,
 878                         CreateTypeTotal,
 879                         ReferencesLoading,
 880                         ReferencesImporting,
 881                         PredefinedTypesInit,
 882                         ModuleDefinitionTotal,
 883                         EmitTotal,
 884                         CloseTypes,
 885                         Resouces,
 886                         OutputSave,
 887                         DebugSave,
 888                 }
 889
 890                 readonly Stopwatch[] timers;
 891                 Stopwatch total;
 892
 893                 public TimeReporter (bool enabled)
 894                 {
 895                         if (!enabled)
 896                                 return;
 897
 898                         timers = new Stopwatch[System.Enum.GetValues(typeof (TimerType)).Length];
 899                 }
 900
 901                 public void Start (TimerType type)
 902                 {
 903                         if (timers != null) {
 904                                 var sw = new Stopwatch ();
 905                                 timers[(int) type] = sw;
 906                                 sw.Start ();
 907                         }
 908                 }
 909
 910                 public void StartTotal ()
 911                 {
 912                         total = new Stopwatch ();
 913                         total.Start ();
 914                 }
 915
 916                 public void Stop (TimerType type)
 917                 {
 918                         if (timers != null) {
 919                                 timers[(int) type].Stop ();
 920                         }
 921                 }
 922
 923                 public void StopTotal ()
 924                 {
 925                         total.Stop ();
 926                 }
 927
 928                 public void ShowStats ()
 929                 {
 930                         if (timers == null)
 931                                 return;
 932
 933                         Dictionary<TimerType, string> timer_names = new Dictionary<TimerType,string> () {
 934                                 { TimerType.ParseTotal, "Parsing source files" },
 935                                 { TimerType.AssemblyBuilderSetup, "Assembly builder setup" },
 936                                 { TimerType.CreateTypeTotal, "Compiled types created" },
 937                                 { TimerType.ReferencesLoading, "Referenced assemblies loading" },
 938                                 { TimerType.ReferencesImporting, "Referenced assemblies importing" },
 939                                 { TimerType.PredefinedTypesInit, "Predefined types initialization" },
 940                                 { TimerType.ModuleDefinitionTotal, "Module definition" },
 941                                 { TimerType.EmitTotal, "Resolving and emitting members blocks" },
 942                                 { TimerType.CloseTypes, "Module types closed" },
 943                                 { TimerType.Resouces, "Embedding resources" },
 944                                 { TimerType.OutputSave, "Writing output file" },
 945                                 { TimerType.DebugSave, "Writing debug symbols file" },
 946                         };
 947
 948                         int counter = 0;
 949                         double percentage = (double) total.ElapsedMilliseconds / 100;
 950                         long subtotal = total.ElapsedMilliseconds;
 951                         foreach (var timer in timers) {
 952                                 string msg = timer_names[(TimerType) counter++];
 953                                 var ms = timer == null ? 0 : timer.ElapsedMilliseconds;
 954                                 Console.WriteLine ("{0,4:0.0}% {1,5}ms {2}", ms / percentage, ms, msg);
 955                                 subtotal -= ms;
 956                         }
 957
 958                         Console.WriteLine ("{0,4:0.0}% {1,5}ms Other tasks", subtotal / percentage, subtotal);
 959                         Console.WriteLine ();
 960                         Console.WriteLine ("Total elapsed time: {0}", total.Elapsed);
 961                 }
 962         }
 963
 964         public class InternalErrorException : Exception {
 965                 public InternalErrorException (MemberCore mc, Exception e)
 966                         : base (mc.Location + " " + mc.GetSignatureForError (), e)
 967                 {
 968                 }
 969
 970                 public InternalErrorException ()
 971                         : base ("Internal error")
 972                 {
 973                 }
 974
 975                 public InternalErrorException (string message)
 976                         : base (message)
 977                 {
 978                 }
 979
 980                 public InternalErrorException (string message, params object[] args)
 981                         : base (String.Format (message, args))
 982                 {
 983                 }
 984
 985                 public InternalErrorException (Exception exception, string message, params object[] args)
 986                         : base (String.Format (message, args), exception)
 987                 {
 988                 }
 989
 990                 public InternalErrorException (Exception e, Location loc)
 991                         : base (loc.ToString (), e)
 992                 {
 993                 }
 994         }
 995
 996         class FatalException : Exception
 997         {
 998                 public FatalException (string message)
 999                         : base (message)
1000                 {
1001                 }
1002         }
1003
1004         /// <summary>
1005         /// Handles #pragma warning
1006         /// </summary>
1007         public class WarningRegions {
1008
1009                 abstract class PragmaCmd
1010                 {
1011                         public int Line;
1012
1013                         protected PragmaCmd (int line)
1014                         {
1015                                 Line = line;
1016                         }
1017
1018                         public abstract bool IsEnabled (int code, bool previous);
1019                 }
1020
1021                 class Disable : PragmaCmd
1022                 {
1023                         int code;
1024                         public Disable (int line, int code)
1025                                 : base (line)
1026                         {
1027                                 this.code = code;
1028                         }
1029
1030                         public override bool IsEnabled (int code, bool previous)
1031                         {
1032                                 return this.code == code ? false : previous;
1033                         }
1034                 }
1035
1036                 class DisableAll : PragmaCmd
1037                 {
1038                         public DisableAll (int line)
1039                                 : base (line) {}
1040
1041                         public override bool IsEnabled(int code, bool previous)
1042                         {
1043                                 return false;
1044                         }
1045                 }
1046
1047                 class Enable : PragmaCmd
1048                 {
1049                         int code;
1050                         public Enable (int line, int code)
1051                                 : base (line)
1052                         {
1053                                 this.code = code;
1054                         }
1055
1056                         public override bool IsEnabled(int code, bool previous)
1057                         {
1058                                 return this.code == code ? true : previous;
1059                         }
1060                 }
1061
1062                 class EnableAll : PragmaCmd
1063                 {
1064                         public EnableAll (int line)
1065                                 : base (line) {}
1066
1067                         public override bool IsEnabled(int code, bool previous)
1068                         {
1069                                 return true;
1070                         }
1071                 }
1072
1073
1074                 List<PragmaCmd> regions = new List<PragmaCmd> ();
1075
1076                 public void WarningDisable (int line)
1077                 {
1078                         regions.Add (new DisableAll (line));
1079                 }
1080
1081                 public void WarningDisable (Location location, int code, Report Report)
1082                 {
1083                         if (Report.CheckWarningCode (code, location))
1084                                 regions.Add (new Disable (location.Row, code));
1085                 }
1086
1087                 public void WarningEnable (int line)
1088                 {
1089                         regions.Add (new EnableAll (line));
1090                 }
1091
1092                 public void WarningEnable (Location location, int code, CompilerContext context)
1093                 {
1094                         if (!context.Report.CheckWarningCode (code, location))
1095                                 return;
1096
1097                         if (context.Settings.IsWarningDisabledGlobally (code))
1098                                 context.Report.Warning (1635, 1, location, "Cannot restore warning `CS{0:0000}' because it was disabled globally", code);
1099
1100                         regions.Add (new Enable (location.Row, code));
1101                 }
1102
1103                 public bool IsWarningEnabled (int code, int src_line)
1104                 {
1105                         bool result = true;
1106                         foreach (PragmaCmd pragma in regions) {
1107                                 if (src_line < pragma.Line)
1108                                         break;
1109
1110                                 result = pragma.IsEnabled (code, result);
1111                         }
1112                         return result;
1113                 }
1114         }
1115 }