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, 1697, 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                         4014
  60                 };
  61
  62                 static HashSet<int> AllWarningsHashSet;
  63
  64                 public Report (CompilerContext context, ReportPrinter printer)
  65                 {
  66                         if (context == null)
  67                                 throw new ArgumentNullException ("settings");
  68                         if (printer == null)
  69                                 throw new ArgumentNullException ("printer");
  70
  71                         this.settings = context.Settings;
  72                         this.printer = printer;
  73                 }
  74
  75                 public void DisableReporting ()
  76                 {
  77                         ++reporting_disabled;
  78                 }
  79
  80                 public void EnableReporting ()
  81                 {
  82                         --reporting_disabled;
  83                 }
  84
  85                 public void FeatureIsNotAvailable (CompilerContext compiler, Location loc, string feature)
  86                 {
  87                         string version;
  88                         switch (compiler.Settings.Version) {
  89                         case LanguageVersion.ISO_1:
  90                                 version = "1.0";
  91                                 break;
  92                         case LanguageVersion.ISO_2:
  93                                 version = "2.0";
  94                                 break;
  95                         case LanguageVersion.V_3:
  96                                 version = "3.0";
  97                                 break;
  98                         case LanguageVersion.V_4:
  99                                 version = "4.0";
 100                                 break;
 101                         case LanguageVersion.V_5:
 102                                 version = "5.0";
 103                                 break;
 104                         default:
 105                                 throw new InternalErrorException ("Invalid feature version", compiler.Settings.Version);
 106                         }
 107
 108                         Error (1644, loc,
 109                                 "Feature `{0}' cannot be used because it is not part of the C# {1} language specification",
 110                                       feature, version);
 111                 }
 112
 113                 public void FeatureIsNotSupported (Location loc, string feature)
 114                 {
 115                         Error (1644, loc,
 116                                 "Feature `{0}' is not supported in Mono mcs1 compiler. Consider using the `gmcs' compiler instead",
 117                                 feature);
 118                 }
 119
 120                 public void RuntimeMissingSupport (Location loc, string feature)
 121                 {
 122                         Error (-88, loc, "Your .NET Runtime does not support `{0}'. Please use the latest Mono runtime instead.", feature);
 123                 }
 124
 125                 /// <summary>
 126                 /// In most error cases is very useful to have information about symbol that caused the error.
 127                 /// Call this method before you call Report.Error when it makes sense.
 128                 /// </summary>
 129                 public void SymbolRelatedToPreviousError (Location loc, string symbol)
 130                 {
 131                         SymbolRelatedToPreviousError (loc.ToString ());
 132                 }
 133
 134                 public void SymbolRelatedToPreviousError (MemberSpec ms)
 135                 {
 136                         if (reporting_disabled > 0 || !printer.HasRelatedSymbolSupport)
 137                                 return;
 138
 139                         var mc = ms.MemberDefinition as MemberCore;
 140                         while (ms is ElementTypeSpec) {
 141                                 ms = ((ElementTypeSpec) ms).Element;
 142                                 mc = ms.MemberDefinition as MemberCore;
 143                         }
 144
 145                         if (mc != null) {
 146                                 SymbolRelatedToPreviousError (mc);
 147                         } else {
 148                                 if (ms.DeclaringType != null)
 149                                         ms = ms.DeclaringType;
 150
 151                                 var imported_type = ms.MemberDefinition as ImportedTypeDefinition;
 152                                 if (imported_type != null) {
 153                                         var iad = imported_type.DeclaringAssembly as ImportedAssemblyDefinition;
 154                                         SymbolRelatedToPreviousError (iad.Location);
 155                                 }
 156                         }
 157                 }
 158
 159                 public void SymbolRelatedToPreviousError (MemberCore mc)
 160                 {
 161                         SymbolRelatedToPreviousError (mc.Location, mc.GetSignatureForError ());
 162                 }
 163
 164                 public void SymbolRelatedToPreviousError (string loc)
 165                 {
 166                         string msg = String.Format ("{0} (Location of the symbol related to previous ", loc);
 167                         if (extra_information.Contains (msg))
 168                                 return;
 169
 170                         extra_information.Add (msg);
 171                 }
 172
 173                 public bool CheckWarningCode (int code, Location loc)
 174                 {
 175                         if (AllWarningsHashSet == null)
 176                                 AllWarningsHashSet = new HashSet<int> (AllWarnings);
 177
 178                         if (AllWarningsHashSet.Contains (code))
 179                                 return true;
 180
 181                         Warning (1691, 1, loc, "`{0}' is not a valid warning number", code);
 182                         return false;
 183                 }
 184
 185                 public void ExtraInformation (Location loc, string msg)
 186                 {
 187                         extra_information.Add (String.Format ("{0} {1}", loc, msg));
 188                 }
 189
 190                 public WarningRegions RegisterWarningRegion (Location location)
 191                 {
 192                         WarningRegions regions;
 193                         if (warning_regions_table == null) {
 194                                 regions = null;
 195                                 warning_regions_table = new Dictionary<int, WarningRegions> ();
 196                         } else {
 197                                 warning_regions_table.TryGetValue (location.File, out regions);
 198                         }
 199
 200                         if (regions == null) {
 201                                 regions = new WarningRegions ();
 202                                 warning_regions_table.Add (location.File, regions);
 203                         }
 204
 205                         return regions;
 206                 }
 207
 208                 public void Warning (int code, int level, Location loc, string message)
 209                 {
 210                         if (reporting_disabled > 0)
 211                                 return;
 212
 213                         if (!settings.IsWarningEnabled (code, level))
 214                                 return;
 215
 216                         if (warning_regions_table != null && !loc.IsNull) {
 217                                 WarningRegions regions;
 218                                 if (warning_regions_table.TryGetValue (loc.File, out regions) && !regions.IsWarningEnabled (code, loc.Row))
 219                                         return;
 220                         }
 221
 222                         AbstractMessage msg;
 223                         if (settings.IsWarningAsError (code)) {
 224                                 message = "Warning as Error: " + message;
 225                                 msg = new ErrorMessage (code, loc, message, extra_information);
 226                         } else {
 227                                 msg = new WarningMessage (code, loc, message, extra_information);
 228                         }
 229
 230                         extra_information.Clear ();
 231                         printer.Print (msg, settings.ShowFullPaths);
 232                 }
 233
 234                 public void Warning (int code, int level, Location loc, string format, string arg)
 235                 {
 236                         Warning (code, level, loc, String.Format (format, arg));
 237                 }
 238
 239                 public void Warning (int code, int level, Location loc, string format, string arg1, string arg2)
 240                 {
 241                         Warning (code, level, loc, String.Format (format, arg1, arg2));
 242                 }
 243
 244                 public void Warning (int code, int level, Location loc, string format, params object[] args)
 245                 {
 246                         Warning (code, level, loc, String.Format (format, args));
 247                 }
 248
 249                 public void Warning (int code, int level, string message)
 250                 {
 251                         Warning (code, level, Location.Null, message);
 252                 }
 253
 254                 public void Warning (int code, int level, string format, string arg)
 255                 {
 256                         Warning (code, level, Location.Null, format, arg);
 257                 }
 258
 259                 public void Warning (int code, int level, string format, string arg1, string arg2)
 260                 {
 261                         Warning (code, level, Location.Null, format, arg1, arg2);
 262                 }
 263
 264                 public void Warning (int code, int level, string format, params string[] args)
 265                 {
 266                         Warning (code, level, Location.Null, String.Format (format, args));
 267                 }
 268
 269                 //
 270                 // Warnings encountered so far
 271                 //
 272                 public int Warnings {
 273                         get { return printer.WarningsCount; }
 274                 }
 275
 276                 public void Error (int code, Location loc, string error)
 277                 {
 278                         if (reporting_disabled > 0)
 279                                 return;
 280
 281                         ErrorMessage msg = new ErrorMessage (code, loc, error, extra_information);
 282                         extra_information.Clear ();
 283
 284                         printer.Print (msg, settings.ShowFullPaths);
 285
 286                         if (settings.Stacktrace)
 287                                 Console.WriteLine (FriendlyStackTrace (new StackTrace (true)));
 288
 289                         if (printer.ErrorsCount == settings.FatalCounter)
 290                                 throw new FatalException (msg.Text);
 291                 }
 292
 293                 public void Error (int code, Location loc, string format, string arg)
 294                 {
 295                         Error (code, loc, String.Format (format, arg));
 296                 }
 297
 298                 public void Error (int code, Location loc, string format, string arg1, string arg2)
 299                 {
 300                         Error (code, loc, String.Format (format, arg1, arg2));
 301                 }
 302
 303                 public void Error (int code, Location loc, string format, params string[] args)
 304                 {
 305                         Error (code, loc, String.Format (format, args));
 306                 }
 307
 308                 public void Error (int code, string error)
 309                 {
 310                         Error (code, Location.Null, error);
 311                 }
 312
 313                 public void Error (int code, string format, string arg)
 314                 {
 315                         Error (code, Location.Null, format, arg);
 316                 }
 317
 318                 public void Error (int code, string format, string arg1, string arg2)
 319                 {
 320                         Error (code, Location.Null, format, arg1, arg2);
 321                 }
 322
 323                 public void Error (int code, string format, params string[] args)
 324                 {
 325                         Error (code, Location.Null, String.Format (format, args));
 326                 }
 327
 328                 //
 329                 // Errors encountered so far
 330                 //
 331                 public int Errors {
 332                         get { return printer.ErrorsCount; }
 333                 }
 334
 335                 public bool IsDisabled {
 336                         get {
 337                                 return reporting_disabled > 0;
 338                         }
 339                 }
 340
 341                 public ReportPrinter Printer {
 342                         get { return printer; }
 343                 }
 344
 345                 public ReportPrinter SetPrinter (ReportPrinter printer)
 346                 {
 347                         ReportPrinter old = this.printer;
 348                         this.printer = printer;
 349                         return old;
 350                 }
 351
 352                 [Conditional ("MCS_DEBUG")]
 353                 static public void Debug (string message, params object[] args)
 354                 {
 355                         Debug (4, message, args);
 356                 }
 357
 358                 [Conditional ("MCS_DEBUG")]
 359                 static public void Debug (int category, string message, params object[] args)
 360                 {
 361 //                      if ((category & DebugFlags) == 0)
 362 //                              return;
 363
 364                         StringBuilder sb = new StringBuilder (message);
 365
 366                         if ((args != null) && (args.Length > 0)) {
 367                                 sb.Append (": ");
 368
 369                                 bool first = true;
 370                                 foreach (object arg in args) {
 371                                         if (first)
 372                                                 first = false;
 373                                         else
 374                                                 sb.Append (", ");
 375                                         if (arg == null)
 376                                                 sb.Append ("null");
 377 //                                      else if (arg is ICollection)
 378 //                                              sb.Append (PrintCollection ((ICollection) arg));
 379                                         else
 380                                                 sb.Append (arg);
 381                                 }
 382                         }
 383
 384                         Console.WriteLine (sb.ToString ());
 385                 }
 386 /*
 387                 static public string PrintCollection (ICollection collection)
 388                 {
 389                         StringBuilder sb = new StringBuilder ();
 390
 391                         sb.Append (collection.GetType ());
 392                         sb.Append ("(");
 393
 394                         bool first = true;
 395                         foreach (object o in collection) {
 396                                 if (first)
 397                                         first = false;
 398                                 else
 399                                         sb.Append (", ");
 400                                 sb.Append (o);
 401                         }
 402
 403                         sb.Append (")");
 404                         return sb.ToString ();
 405                 }
 406 */
 407                 static string FriendlyStackTrace (StackTrace t)
 408                 {
 409                         StringBuilder sb = new StringBuilder ();
 410
 411                         bool foundUserCode = false;
 412
 413                         for (int i = 0; i < t.FrameCount; i++) {
 414                                 StackFrame f = t.GetFrame (i);
 415                                 var mb = f.GetMethod ();
 416
 417                                 if (!foundUserCode && mb.ReflectedType == typeof (Report))
 418                                         continue;
 419
 420                                 foundUserCode = true;
 421
 422                                 sb.Append ("\tin ");
 423
 424                                 if (f.GetFileLineNumber () > 0)
 425                                         sb.AppendFormat ("(at {0}:{1}) ", f.GetFileName (), f.GetFileLineNumber ());
 426
 427                                 sb.AppendFormat ("{0}.{1} (", mb.ReflectedType.Name, mb.Name);
 428
 429                                 bool first = true;
 430                                 foreach (var pi in mb.GetParameters ()) {
 431                                         if (!first)
 432                                                 sb.Append (", ");
 433                                         first = false;
 434
 435                                         sb.Append (pi.ParameterType.FullName);
 436                                 }
 437                                 sb.Append (")\n");
 438                         }
 439
 440                         return sb.ToString ();
 441                 }
 442         }
 443
 444         public abstract class AbstractMessage
 445         {
 446                 readonly string[] extra_info;
 447                 protected readonly int code;
 448                 protected readonly Location location;
 449                 readonly string message;
 450
 451                 protected AbstractMessage (int code, Location loc, string msg, List<string> extraInfo)
 452                 {
 453                         this.code = code;
 454                         if (code < 0)
 455                                 this.code = 8000 - code;
 456
 457                         this.location = loc;
 458                         this.message = msg;
 459                         if (extraInfo.Count != 0) {
 460                                 this.extra_info = extraInfo.ToArray ();
 461                         }
 462                 }
 463
 464                 protected AbstractMessage (AbstractMessage aMsg)
 465                 {
 466                         this.code = aMsg.code;
 467                         this.location = aMsg.location;
 468                         this.message = aMsg.message;
 469                         this.extra_info = aMsg.extra_info;
 470                 }
 471
 472                 public int Code {
 473                         get { return code; }
 474                 }
 475
 476                 public override bool Equals (object obj)
 477                 {
 478                         AbstractMessage msg = obj as AbstractMessage;
 479                         if (msg == null)
 480                                 return false;
 481
 482                         return code == msg.code && location.Equals (msg.location) && message == msg.message;
 483                 }
 484
 485                 public override int GetHashCode ()
 486                 {
 487                         return code.GetHashCode ();
 488                 }
 489
 490                 public abstract bool IsWarning { get; }
 491
 492                 public Location Location {
 493                         get { return location; }
 494                 }
 495
 496                 public abstract string MessageType { get; }
 497
 498                 public string[] RelatedSymbols {
 499                         get { return extra_info; }
 500                 }
 501
 502                 public string Text {
 503                         get { return message; }
 504                 }
 505         }
 506
 507         sealed class WarningMessage : AbstractMessage
 508         {
 509                 public WarningMessage (int code, Location loc, string message, List<string> extra_info)
 510                         : base (code, loc, message, extra_info)
 511                 {
 512                 }
 513
 514                 public override bool IsWarning {
 515                         get { return true; }
 516                 }
 517
 518                 public override string MessageType {
 519                         get {
 520                                 return "warning";
 521                         }
 522                 }
 523         }
 524
 525         sealed class ErrorMessage : AbstractMessage
 526         {
 527                 public ErrorMessage (int code, Location loc, string message, List<string> extraInfo)
 528                         : base (code, loc, message, extraInfo)
 529                 {
 530                 }
 531
 532                 public ErrorMessage (AbstractMessage aMsg)
 533                         : base (aMsg)
 534                 {
 535                 }
 536
 537                 public override bool IsWarning {
 538                         get { return false; }
 539                 }
 540
 541                 public override string MessageType {
 542                         get {
 543                                 return "error";
 544                         }
 545                 }
 546         }
 547
 548         //
 549         // Generic base for any message writer
 550         //
 551         public abstract class ReportPrinter
 552         {
 553                 #region Properties
 554
 555                 public int ErrorsCount { get; protected set; }
 556
 557                 public int WarningsCount { get; private set; }
 558
 559                 //
 560                 // When (symbols related to previous ...) can be used
 561                 //
 562                 public virtual bool HasRelatedSymbolSupport {
 563                         get { return true; }
 564                 }
 565
 566                 #endregion
 567
 568
 569                 protected virtual string FormatText (string txt)
 570                 {
 571                         return txt;
 572                 }
 573
 574                 public virtual void Print (AbstractMessage msg, bool showFullPath)
 575                 {
 576                         if (msg.IsWarning) {
 577                                 ++WarningsCount;
 578                         } else {
 579                                 ++ErrorsCount;
 580                         }
 581                 }
 582
 583                 protected void Print (AbstractMessage msg, TextWriter output, bool showFullPath)
 584                 {
 585                         StringBuilder txt = new StringBuilder ();
 586                         if (!msg.Location.IsNull) {
 587                                 if (showFullPath)
 588                                         txt.Append (msg.Location.ToStringFullName ());
 589                                 else
 590                                         txt.Append (msg.Location.ToString ());
 591
 592                                 txt.Append (" ");
 593                         }
 594
 595                         txt.AppendFormat ("{0} CS{1:0000}: {2}", msg.MessageType, msg.Code, msg.Text);
 596
 597                         if (!msg.IsWarning)
 598                                 output.WriteLine (FormatText (txt.ToString ()));
 599                         else
 600                                 output.WriteLine (txt.ToString ());
 601
 602                         if (msg.RelatedSymbols != null) {
 603                                 foreach (string s in msg.RelatedSymbols)
 604                                         output.WriteLine (s + msg.MessageType + ")");
 605                         }
 606                 }
 607
 608                 public void Reset ()
 609                 {
 610                         // HACK: Temporary hack for broken repl flow
 611                         ErrorsCount = WarningsCount = 0;
 612                 }
 613         }
 614
 615         sealed class NullReportPrinter : ReportPrinter
 616         {
 617         }
 618
 619         //
 620         // Default message recorder, it uses two types of message groups.
 621         // Common messages: messages reported in all sessions.
 622         // Merged messages: union of all messages in all sessions.
 623         //
 624         // Used by the Lambda expressions to compile the code with various
 625         // parameter values, or by attribute resolver
 626         //
 627         class SessionReportPrinter : ReportPrinter
 628         {
 629                 List<AbstractMessage> session_messages;
 630                 //
 631                 // A collection of exactly same messages reported in all sessions
 632                 //
 633                 List<AbstractMessage> common_messages;
 634
 635                 //
 636                 // A collection of unique messages reported in all sessions
 637                 //
 638                 List<AbstractMessage> merged_messages;
 639
 640                 bool showFullPaths;
 641
 642                 public void ClearSession ()
 643                 {
 644                         session_messages = null;
 645                 }
 646
 647                 public override void Print (AbstractMessage msg, bool showFullPath)
 648                 {
 649                         //
 650                         // This line is useful when debugging recorded messages
 651                         //
 652                         // Console.WriteLine ("RECORDING: {0}", msg.ToString ());
 653
 654                         if (session_messages == null)
 655                                 session_messages = new List<AbstractMessage> ();
 656
 657                         session_messages.Add (msg);
 658
 659                         this.showFullPaths = showFullPath;
 660                         base.Print (msg, showFullPath);
 661                 }
 662
 663                 public void EndSession ()
 664                 {
 665                         if (session_messages == null)
 666                                 return;
 667
 668                         //
 669                         // Handles the first session
 670                         //
 671                         if (common_messages == null) {
 672                                 common_messages = new List<AbstractMessage> (session_messages);
 673                                 merged_messages = session_messages;
 674                                 session_messages = null;
 675                                 return;
 676                         }
 677
 678                         //
 679                         // Store common messages if any
 680                         //
 681                         for (int i = 0; i < common_messages.Count; ++i) {
 682                                 AbstractMessage cmsg = common_messages[i];
 683                                 bool common_msg_found = false;
 684                                 foreach (AbstractMessage msg in session_messages) {
 685                                         if (cmsg.Equals (msg)) {
 686                                                 common_msg_found = true;
 687                                                 break;
 688                                         }
 689                                 }
 690
 691                                 if (!common_msg_found)
 692                                         common_messages.RemoveAt (i);
 693                         }
 694
 695                         //
 696                         // Merge session and previous messages
 697                         //
 698                         for (int i = 0; i < session_messages.Count; ++i) {
 699                                 AbstractMessage msg = session_messages[i];
 700                                 bool msg_found = false;
 701                                 for (int ii = 0; ii < merged_messages.Count; ++ii) {
 702                                         if (msg.Equals (merged_messages[ii])) {
 703                                                 msg_found = true;
 704                                                 break;
 705                                         }
 706                                 }
 707
 708                                 if (!msg_found)
 709                                         merged_messages.Add (msg);
 710                         }
 711                 }
 712
 713                 public bool IsEmpty {
 714                         get {
 715                                 return merged_messages == null && common_messages == null;
 716                         }
 717                 }
 718
 719                 //
 720                 // Prints collected messages, common messages have a priority
 721                 //
 722                 public bool Merge (ReportPrinter dest)
 723                 {
 724                         var messages_to_print = merged_messages;
 725                         if (common_messages != null && common_messages.Count > 0) {
 726                                 messages_to_print = common_messages;
 727                         }
 728
 729                         if (messages_to_print == null)
 730                                 return false;
 731
 732                         bool error_msg = false;
 733                         foreach (AbstractMessage msg in messages_to_print) {
 734                                 dest.Print (msg, showFullPaths);
 735                                 error_msg |= !msg.IsWarning;
 736                         }
 737
 738                         return error_msg;
 739                 }
 740         }
 741
 742         public class StreamReportPrinter : ReportPrinter
 743         {
 744                 readonly TextWriter writer;
 745
 746                 public StreamReportPrinter (TextWriter writer)
 747                 {
 748                         this.writer = writer;
 749                 }
 750
 751                 public override void Print (AbstractMessage msg, bool showFullPath)
 752                 {
 753                         Print (msg, writer, showFullPath);
 754                         base.Print (msg, showFullPath);
 755                 }
 756         }
 757
 758         public class ConsoleReportPrinter : StreamReportPrinter
 759         {
 760                 static readonly string prefix, postfix;
 761
 762                 static ConsoleReportPrinter ()
 763                 {
 764                         string term = Environment.GetEnvironmentVariable ("TERM");
 765                         bool xterm_colors = false;
 766
 767                         switch (term){
 768                         case "xterm":
 769                         case "rxvt":
 770                         case "rxvt-unicode":
 771                                 if (Environment.GetEnvironmentVariable ("COLORTERM") != null){
 772                                         xterm_colors = true;
 773                                 }
 774                                 break;
 775
 776                         case "xterm-color":
 777                         case "xterm-256color":
 778                                 xterm_colors = true;
 779                                 break;
 780                         }
 781                         if (!xterm_colors)
 782                                 return;
 783
 784                         if (!(UnixUtils.isatty (1) && UnixUtils.isatty (2)))
 785                                 return;
 786
 787                         string config = Environment.GetEnvironmentVariable ("MCS_COLORS");
 788                         if (config == null){
 789                                 config = "errors=red";
 790                                 //config = "brightwhite,red";
 791                         }
 792
 793                         if (config == "disable")
 794                                 return;
 795
 796                         if (!config.StartsWith ("errors="))
 797                                 return;
 798
 799                         config = config.Substring (7);
 800
 801                         int p = config.IndexOf (",");
 802                         if (p == -1)
 803                                 prefix = GetForeground (config);
 804                         else
 805                                 prefix = GetBackground (config.Substring (p+1)) + GetForeground (config.Substring (0, p));
 806                         postfix = "\x001b[0m";
 807                 }
 808
 809                 public ConsoleReportPrinter ()
 810                         : base (Console.Error)
 811                 {
 812                 }
 813
 814                 public ConsoleReportPrinter (TextWriter writer)
 815                         : base (writer)
 816                 {
 817                 }
 818
 819                 static int NameToCode (string s)
 820                 {
 821                         switch (s) {
 822                         case "black":
 823                                 return 0;
 824                         case "red":
 825                                 return 1;
 826                         case "green":
 827                                 return 2;
 828                         case "yellow":
 829                                 return 3;
 830                         case "blue":
 831                                 return 4;
 832                         case "magenta":
 833                                 return 5;
 834                         case "cyan":
 835                                 return 6;
 836                         case "grey":
 837                         case "white":
 838                                 return 7;
 839                         }
 840                         return 7;
 841                 }
 842
 843                 //
 844                 // maps a color name to its xterm color code
 845                 //
 846                 static string GetForeground (string s)
 847                 {
 848                         string highcode;
 849
 850                         if (s.StartsWith ("bright")) {
 851                                 highcode = "1;";
 852                                 s = s.Substring (6);
 853                         } else
 854                                 highcode = "";
 855
 856                         return "\x001b[" + highcode + (30 + NameToCode (s)).ToString () + "m";
 857                 }
 858
 859                 static string GetBackground (string s)
 860                 {
 861                         return "\x001b[" + (40 + NameToCode (s)).ToString () + "m";
 862                 }
 863
 864                 protected override string FormatText (string txt)
 865                 {
 866                         if (prefix != null)
 867                                 return prefix + txt + postfix;
 868
 869                         return txt;
 870                 }
 871         }
 872
 873         class TimeReporter
 874         {
 875                 public enum TimerType
 876                 {
 877                         ParseTotal,
 878                         AssemblyBuilderSetup,
 879                         CreateTypeTotal,
 880                         ReferencesLoading,
 881                         ReferencesImporting,
 882                         PredefinedTypesInit,
 883                         ModuleDefinitionTotal,
 884                         EmitTotal,
 885                         CloseTypes,
 886                         Resouces,
 887                         OutputSave,
 888                         DebugSave,
 889                 }
 890
 891                 readonly Stopwatch[] timers;
 892                 Stopwatch total;
 893
 894                 public TimeReporter (bool enabled)
 895                 {
 896                         if (!enabled)
 897                                 return;
 898
 899                         timers = new Stopwatch[System.Enum.GetValues(typeof (TimerType)).Length];
 900                 }
 901
 902                 public void Start (TimerType type)
 903                 {
 904                         if (timers != null) {
 905                                 var sw = new Stopwatch ();
 906                                 timers[(int) type] = sw;
 907                                 sw.Start ();
 908                         }
 909                 }
 910
 911                 public void StartTotal ()
 912                 {
 913                         total = new Stopwatch ();
 914                         total.Start ();
 915                 }
 916
 917                 public void Stop (TimerType type)
 918                 {
 919                         if (timers != null) {
 920                                 timers[(int) type].Stop ();
 921                         }
 922                 }
 923
 924                 public void StopTotal ()
 925                 {
 926                         total.Stop ();
 927                 }
 928
 929                 public void ShowStats ()
 930                 {
 931                         if (timers == null)
 932                                 return;
 933
 934                         Dictionary<TimerType, string> timer_names = new Dictionary<TimerType,string> () {
 935                                 { TimerType.ParseTotal, "Parsing source files" },
 936                                 { TimerType.AssemblyBuilderSetup, "Assembly builder setup" },
 937                                 { TimerType.CreateTypeTotal, "Compiled types created" },
 938                                 { TimerType.ReferencesLoading, "Referenced assemblies loading" },
 939                                 { TimerType.ReferencesImporting, "Referenced assemblies importing" },
 940                                 { TimerType.PredefinedTypesInit, "Predefined types initialization" },
 941                                 { TimerType.ModuleDefinitionTotal, "Module definition" },
 942                                 { TimerType.EmitTotal, "Resolving and emitting members blocks" },
 943                                 { TimerType.CloseTypes, "Module types closed" },
 944                                 { TimerType.Resouces, "Embedding resources" },
 945                                 { TimerType.OutputSave, "Writing output file" },
 946                                 { TimerType.DebugSave, "Writing debug symbols file" },
 947                         };
 948
 949                         int counter = 0;
 950                         double percentage = (double) total.ElapsedMilliseconds / 100;
 951                         long subtotal = total.ElapsedMilliseconds;
 952                         foreach (var timer in timers) {
 953                                 string msg = timer_names[(TimerType) counter++];
 954                                 var ms = timer == null ? 0 : timer.ElapsedMilliseconds;
 955                                 Console.WriteLine ("{0,4:0.0}% {1,5}ms {2}", ms / percentage, ms, msg);
 956                                 subtotal -= ms;
 957                         }
 958
 959                         Console.WriteLine ("{0,4:0.0}% {1,5}ms Other tasks", subtotal / percentage, subtotal);
 960                         Console.WriteLine ();
 961                         Console.WriteLine ("Total elapsed time: {0}", total.Elapsed);
 962                 }
 963         }
 964
 965         public class InternalErrorException : Exception {
 966                 public InternalErrorException (MemberCore mc, Exception e)
 967                         : base (mc.Location + " " + mc.GetSignatureForError (), e)
 968                 {
 969                 }
 970
 971                 public InternalErrorException ()
 972                         : base ("Internal error")
 973                 {
 974                 }
 975
 976                 public InternalErrorException (string message)
 977                         : base (message)
 978                 {
 979                 }
 980
 981                 public InternalErrorException (string message, params object[] args)
 982                         : base (String.Format (message, args))
 983                 {
 984                 }
 985
 986                 public InternalErrorException (Exception exception, string message, params object[] args)
 987                         : base (String.Format (message, args), exception)
 988                 {
 989                 }
 990
 991                 public InternalErrorException (Exception e, Location loc)
 992                         : base (loc.ToString (), e)
 993                 {
 994                 }
 995         }
 996
 997         class FatalException : Exception
 998         {
 999                 public FatalException (string message)
1000                         : base (message)
1001                 {
1002                 }
1003         }
1004
1005         /// <summary>
1006         /// Handles #pragma warning
1007         /// </summary>
1008         public class WarningRegions {
1009
1010                 abstract class PragmaCmd
1011                 {
1012                         public int Line;
1013
1014                         protected PragmaCmd (int line)
1015                         {
1016                                 Line = line;
1017                         }
1018
1019                         public abstract bool IsEnabled (int code, bool previous);
1020                 }
1021
1022                 class Disable : PragmaCmd
1023                 {
1024                         int code;
1025                         public Disable (int line, int code)
1026                                 : base (line)
1027                         {
1028                                 this.code = code;
1029                         }
1030
1031                         public override bool IsEnabled (int code, bool previous)
1032                         {
1033                                 return this.code == code ? false : previous;
1034                         }
1035                 }
1036
1037                 class DisableAll : PragmaCmd
1038                 {
1039                         public DisableAll (int line)
1040                                 : base (line) {}
1041
1042                         public override bool IsEnabled(int code, bool previous)
1043                         {
1044                                 return false;
1045                         }
1046                 }
1047
1048                 class Enable : PragmaCmd
1049                 {
1050                         int code;
1051                         public Enable (int line, int code)
1052                                 : base (line)
1053                         {
1054                                 this.code = code;
1055                         }
1056
1057                         public override bool IsEnabled(int code, bool previous)
1058                         {
1059                                 return this.code == code ? true : previous;
1060                         }
1061                 }
1062
1063                 class EnableAll : PragmaCmd
1064                 {
1065                         public EnableAll (int line)
1066                                 : base (line) {}
1067
1068                         public override bool IsEnabled(int code, bool previous)
1069                         {
1070                                 return true;
1071                         }
1072                 }
1073
1074
1075                 List<PragmaCmd> regions = new List<PragmaCmd> ();
1076
1077                 public void WarningDisable (int line)
1078                 {
1079                         regions.Add (new DisableAll (line));
1080                 }
1081
1082                 public void WarningDisable (Location location, int code, Report Report)
1083                 {
1084                         if (Report.CheckWarningCode (code, location))
1085                                 regions.Add (new Disable (location.Row, code));
1086                 }
1087
1088                 public void WarningEnable (int line)
1089                 {
1090                         regions.Add (new EnableAll (line));
1091                 }
1092
1093                 public void WarningEnable (Location location, int code, CompilerContext context)
1094                 {
1095                         if (!context.Report.CheckWarningCode (code, location))
1096                                 return;
1097
1098                         if (context.Settings.IsWarningDisabledGlobally (code))
1099                                 context.Report.Warning (1635, 1, location, "Cannot restore warning `CS{0:0000}' because it was disabled globally", code);
1100
1101                         regions.Add (new Enable (location.Row, code));
1102                 }
1103
1104                 public bool IsWarningEnabled (int code, int src_line)
1105                 {
1106                         bool result = true;
1107                         foreach (PragmaCmd pragma in regions) {
1108                                 if (src_line < pragma.Line)
1109                                         break;
1110
1111                                 result = pragma.IsEnabled (code, result);
1112                         }
1113                         return result;
1114                 }
1115         }
1116 }