mcs/mcs/report.cs

   1 //
   2 // report.cs: report errors and warnings.
   3 //
   4 // Author: Miguel de Icaza (miguel@ximian.com)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // Copyright 2001 Ximian, Inc. (http://www.ximian.com)
   8 //
   9
  10 using System;
  11 using System.IO;
  12 using System.Text;
  13 using System.Collections.Generic;
  14 using System.Diagnostics;
  15
  16 namespace Mono.CSharp {
  17
  18         //
  19         // Errors and warnings manager
  20         //
  21         public class Report
  22         {
  23                 /// <summary>
  24                 ///   Whether warnings should be considered errors
  25                 /// </summary>
  26                 public bool WarningsAreErrors;
  27                 List<int> warnings_as_error;
  28                 List<int> warnings_only;
  29
  30                 public static int DebugFlags = 0;
  31
  32                 public const int RuntimeErrorId = 10000;
  33
  34                 //
  35                 // Keeps track of the warnings that we are ignoring
  36                 //
  37                 HashSet<int> warning_ignore_table;
  38
  39                 Dictionary<int, WarningRegions> warning_regions_table;
  40
  41                 int warning_level;
  42
  43                 ReportPrinter printer;
  44
  45                 int reporting_disabled;
  46
  47                 /// <summary>
  48                 /// List of symbols related to reported error/warning. You have to fill it before error/warning is reported.
  49                 /// </summary>
  50                 List<string> extra_information = new List<string> ();
  51
  52                 //
  53                 // IF YOU ADD A NEW WARNING YOU HAVE TO ADD ITS ID HERE
  54                 //
  55                 public static readonly int[] AllWarnings = new int[] {
  56                         28, 67, 78,
  57                         105, 108, 109, 114, 162, 164, 168, 169, 183, 184, 197,
  58                         219, 251, 252, 253, 278, 282,
  59                         402, 414, 419, 420, 429, 436, 440, 458, 464, 465, 467, 469, 472,
  60                         612, 618, 626, 628, 642, 649, 652, 658, 659, 660, 661, 665, 672, 675, 693,
  61                         728,
  62                         809,
  63                         1030, 1058, 1066,
  64                         1522, 1570, 1571, 1572, 1573, 1574, 1580, 1581, 1584, 1587, 1589, 1590, 1591, 1592,
  65                         1607, 1616, 1633, 1634, 1635, 1685, 1690, 1691, 1692, 1695, 1696, 1699,
  66                         1700, 1709, 1717, 1718, 1720,
  67                         1901, 1981,
  68                         2002, 2023, 2029,
  69                         3000, 3001, 3002, 3003, 3005, 3006, 3007, 3008, 3009,
  70                         3010, 3011, 3012, 3013, 3014, 3015, 3016, 3017, 3018, 3019,
  71                         3021, 3022, 3023, 3024, 3026, 3027
  72                 };
  73
  74                 static HashSet<int> AllWarningsHashSet;
  75
  76                 public Report (ReportPrinter printer)
  77                 {
  78                         if (printer == null)
  79                                 throw new ArgumentNullException ("printer");
  80
  81                         this.printer = printer;
  82                         warning_level = 4;
  83                 }
  84
  85                 public void DisableReporting ()
  86                 {
  87                         ++reporting_disabled;
  88                 }
  89
  90                 public void EnableReporting ()
  91                 {
  92                         --reporting_disabled;
  93                 }
  94
  95                 public void FeatureIsNotAvailable (Location loc, string feature)
  96                 {
  97                         string version;
  98                         switch (RootContext.Version) {
  99                         case LanguageVersion.ISO_1:
 100                                 version = "1.0";
 101                                 break;
 102                         case LanguageVersion.ISO_2:
 103                                 version = "2.0";
 104                                 break;
 105                         case LanguageVersion.V_3:
 106                                 version = "3.0";
 107                                 break;
 108                         default:
 109                                 throw new InternalErrorException ("Invalid feature version", RootContext.Version);
 110                         }
 111
 112                         Error (1644, loc,
 113                                 "Feature `{0}' cannot be used because it is not part of the C# {1} language specification",
 114                                       feature, version);
 115                 }
 116
 117                 public void FeatureIsNotSupported (Location loc, string feature)
 118                 {
 119                         Error (1644, loc,
 120                                 "Feature `{0}' is not supported in Mono mcs1 compiler. Consider using the `gmcs' compiler instead",
 121                                 feature);
 122                 }
 123
 124                 bool IsWarningEnabled (int code, int level, Location loc)
 125                 {
 126                         if (WarningLevel < level)
 127                                 return false;
 128
 129                         if (IsWarningDisabledGlobally (code))
 130                                 return false;
 131
 132                         if (warning_regions_table == null || loc.IsNull)
 133                                 return true;
 134
 135                         WarningRegions regions;
 136                         if (!warning_regions_table.TryGetValue (loc.File, out regions))
 137                                 return true;
 138
 139                         return regions.IsWarningEnabled (code, loc.Row);
 140                 }
 141
 142                 public bool IsWarningDisabledGlobally (int code)
 143                 {
 144                         return warning_ignore_table != null && warning_ignore_table.Contains (code);
 145                 }
 146
 147                 bool IsWarningAsError (int code)
 148                 {
 149                         bool is_error = WarningsAreErrors;
 150
 151                         // Check specific list
 152                         if (warnings_as_error != null)
 153                                 is_error |= warnings_as_error.Contains (code);
 154
 155                         // Ignore excluded warnings
 156                         if (warnings_only != null && warnings_only.Contains (code))
 157                                 is_error = false;
 158
 159                         return is_error;
 160                 }
 161
 162                 public void RuntimeMissingSupport (Location loc, string feature)
 163                 {
 164                         Error (-88, loc, "Your .NET Runtime does not support `{0}'. Please use the latest Mono runtime instead.", feature);
 165                 }
 166
 167                 /// <summary>
 168                 /// In most error cases is very useful to have information about symbol that caused the error.
 169                 /// Call this method before you call Report.Error when it makes sense.
 170                 /// </summary>
 171                 public void SymbolRelatedToPreviousError (Location loc, string symbol)
 172                 {
 173                         SymbolRelatedToPreviousError (loc.ToString (), symbol);
 174                 }
 175
 176                 public void SymbolRelatedToPreviousError (MemberSpec ms)
 177                 {
 178                         if (reporting_disabled > 0 || !printer.HasRelatedSymbolSupport)
 179                                 return;
 180
 181                         var mc = ms.MemberDefinition as MemberCore;
 182                         while (ms is ElementTypeSpec) {
 183                                 ms = ((ElementTypeSpec) ms).Element;
 184                                 mc = ms.MemberDefinition as MemberCore;
 185                         }
 186
 187                         if (mc != null) {
 188                                 SymbolRelatedToPreviousError (mc);
 189                         } else {
 190                                 if (ms.DeclaringType != null)
 191                                         ms = ms.DeclaringType;
 192
 193                                 var imported_type = ms.MemberDefinition as ImportedTypeDefinition;
 194                                 if (imported_type != null) {
 195                                         var iad = imported_type.DeclaringAssembly as ImportedAssemblyDefinition;
 196                                         SymbolRelatedToPreviousError (iad.Location, "");
 197                                 }
 198                         }
 199                 }
 200
 201                 public void SymbolRelatedToPreviousError (MemberCore mc)
 202                 {
 203                         SymbolRelatedToPreviousError (mc.Location, mc.GetSignatureForError ());
 204                 }
 205
 206                 void SymbolRelatedToPreviousError (string loc, string symbol)
 207                 {
 208                         string msg = String.Format ("{0} (Location of the symbol related to previous ", loc);
 209                         if (extra_information.Contains (msg))
 210                                 return;
 211
 212                         extra_information.Add (msg);
 213                 }
 214
 215                 public void AddWarningAsError (string warningId)
 216                 {
 217                         int id;
 218                         try {
 219                                 id = int.Parse (warningId);
 220                         } catch {
 221                                 CheckWarningCode (warningId, Location.Null);
 222                                 return;
 223                         }
 224
 225                         if (!CheckWarningCode (id, Location.Null))
 226                                 return;
 227
 228                         if (warnings_as_error == null)
 229                                 warnings_as_error = new List<int> ();
 230
 231                         warnings_as_error.Add (id);
 232                 }
 233
 234                 public void RemoveWarningAsError (string warningId)
 235                 {
 236                         int id;
 237                         try {
 238                                 id = int.Parse (warningId);
 239                         } catch {
 240                                 CheckWarningCode (warningId, Location.Null);
 241                                 return;
 242                         }
 243
 244                         if (!CheckWarningCode (id, Location.Null))
 245                                 return;
 246
 247                         if (warnings_only == null)
 248                                 warnings_only = new List<int> ();
 249
 250                         warnings_only.Add (id);
 251                 }
 252
 253                 public bool CheckWarningCode (string code, Location loc)
 254                 {
 255                         Warning (1691, 1, loc, "`{0}' is not a valid warning number", code);
 256                         return false;
 257                 }
 258
 259                 public bool CheckWarningCode (int code, Location loc)
 260                 {
 261                         if (AllWarningsHashSet == null)
 262                                 AllWarningsHashSet = new HashSet<int> (AllWarnings);
 263
 264                         if (AllWarningsHashSet.Contains (code))
 265                                 return true;
 266
 267                         return CheckWarningCode (code.ToString (), loc);
 268                 }
 269
 270                 public void ExtraInformation (Location loc, string msg)
 271                 {
 272                         extra_information.Add (String.Format ("{0} {1}", loc, msg));
 273                 }
 274
 275                 public WarningRegions RegisterWarningRegion (Location location)
 276                 {
 277                         WarningRegions regions;
 278                         if (warning_regions_table == null) {
 279                                 regions = null;
 280                                 warning_regions_table = new Dictionary<int, WarningRegions> ();
 281                         } else {
 282                                 warning_regions_table.TryGetValue (location.File, out regions);
 283                         }
 284
 285                         if (regions == null) {
 286                                 regions = new WarningRegions ();
 287                                 warning_regions_table.Add (location.File, regions);
 288                         }
 289
 290                         return regions;
 291                 }
 292
 293                 public void Warning (int code, int level, Location loc, string message)
 294                 {
 295                         if (reporting_disabled > 0)
 296                                 return;
 297
 298                         if (!IsWarningEnabled (code, level, loc))
 299                                 return;
 300
 301                         AbstractMessage msg;
 302                         if (IsWarningAsError (code))
 303                                 msg = new ErrorMessage (code, loc, message, extra_information);
 304                         else
 305                                 msg = new WarningMessage (code, loc, message, extra_information);
 306
 307                         extra_information.Clear ();
 308                         printer.Print (msg);
 309                 }
 310
 311                 public void Warning (int code, int level, Location loc, string format, string arg)
 312                 {
 313                         Warning (code, level, loc, String.Format (format, arg));
 314                 }
 315
 316                 public void Warning (int code, int level, Location loc, string format, string arg1, string arg2)
 317                 {
 318                         Warning (code, level, loc, String.Format (format, arg1, arg2));
 319                 }
 320
 321                 public void Warning (int code, int level, Location loc, string format, params object[] args)
 322                 {
 323                         Warning (code, level, loc, String.Format (format, args));
 324                 }
 325
 326                 public void Warning (int code, int level, string message)
 327                 {
 328                         Warning (code, level, Location.Null, message);
 329                 }
 330
 331                 public void Warning (int code, int level, string format, string arg)
 332                 {
 333                         Warning (code, level, Location.Null, format, arg);
 334                 }
 335
 336                 public void Warning (int code, int level, string format, string arg1, string arg2)
 337                 {
 338                         Warning (code, level, Location.Null, format, arg1, arg2);
 339                 }
 340
 341                 public void Warning (int code, int level, string format, params string[] args)
 342                 {
 343                         Warning (code, level, Location.Null, String.Format (format, args));
 344                 }
 345
 346                 //
 347                 // Warnings encountered so far
 348                 //
 349                 public int Warnings {
 350                         get { return printer.WarningsCount; }
 351                 }
 352
 353                 public void Error (int code, Location loc, string error)
 354                 {
 355                         if (reporting_disabled > 0)
 356                                 return;
 357
 358                         ErrorMessage msg = new ErrorMessage (code, loc, error, extra_information);
 359                         extra_information.Clear ();
 360
 361                         printer.Print (msg);
 362                 }
 363
 364                 public void Error (int code, Location loc, string format, string arg)
 365                 {
 366                         Error (code, loc, String.Format (format, arg));
 367                 }
 368
 369                 public void Error (int code, Location loc, string format, string arg1, string arg2)
 370                 {
 371                         Error (code, loc, String.Format (format, arg1, arg2));
 372                 }
 373
 374                 public void Error (int code, Location loc, string format, params string[] args)
 375                 {
 376                         Error (code, loc, String.Format (format, args));
 377                 }
 378
 379                 public void Error (int code, string error)
 380                 {
 381                         Error (code, Location.Null, error);
 382                 }
 383
 384                 public void Error (int code, string format, string arg)
 385                 {
 386                         Error (code, Location.Null, format, arg);
 387                 }
 388
 389                 public void Error (int code, string format, string arg1, string arg2)
 390                 {
 391                         Error (code, Location.Null, format, arg1, arg2);
 392                 }
 393
 394                 public void Error (int code, string format, params string[] args)
 395                 {
 396                         Error (code, Location.Null, String.Format (format, args));
 397                 }
 398
 399                 //
 400                 // Errors encountered so far
 401                 //
 402                 public int Errors {
 403                         get { return printer.ErrorsCount; }
 404                 }
 405
 406                 public bool IsDisabled {
 407                         get {
 408                                 return reporting_disabled > 0;
 409                         }
 410                 }
 411
 412                 public ReportPrinter Printer {
 413                         get { return printer; }
 414                 }
 415
 416                 public void SetIgnoreWarning (int code)
 417                 {
 418                         if (warning_ignore_table == null)
 419                                 warning_ignore_table = new HashSet<int> ();
 420
 421                         warning_ignore_table.Add (code);
 422                 }
 423
 424                 public ReportPrinter SetPrinter (ReportPrinter printer)
 425                 {
 426                         ReportPrinter old = this.printer;
 427                         this.printer = printer;
 428                         return old;
 429                 }
 430
 431                 public int WarningLevel {
 432                         get {
 433                                 return warning_level;
 434                         }
 435                         set {
 436                                 warning_level = value;
 437                         }
 438                 }
 439
 440                 [Conditional ("MCS_DEBUG")]
 441                 static public void Debug (string message, params object[] args)
 442                 {
 443                         Debug (4, message, args);
 444                 }
 445
 446                 [Conditional ("MCS_DEBUG")]
 447                 static public void Debug (int category, string message, params object[] args)
 448                 {
 449                         if ((category & DebugFlags) == 0)
 450                                 return;
 451
 452                         StringBuilder sb = new StringBuilder (message);
 453
 454                         if ((args != null) && (args.Length > 0)) {
 455                                 sb.Append (": ");
 456
 457                                 bool first = true;
 458                                 foreach (object arg in args) {
 459                                         if (first)
 460                                                 first = false;
 461                                         else
 462                                                 sb.Append (", ");
 463                                         if (arg == null)
 464                                                 sb.Append ("null");
 465 //                                      else if (arg is ICollection)
 466 //                                              sb.Append (PrintCollection ((ICollection) arg));
 467                                         else
 468                                                 sb.Append (arg);
 469                                 }
 470                         }
 471
 472                         Console.WriteLine (sb.ToString ());
 473                 }
 474 /*
 475                 static public string PrintCollection (ICollection collection)
 476                 {
 477                         StringBuilder sb = new StringBuilder ();
 478
 479                         sb.Append (collection.GetType ());
 480                         sb.Append ("(");
 481
 482                         bool first = true;
 483                         foreach (object o in collection) {
 484                                 if (first)
 485                                         first = false;
 486                                 else
 487                                         sb.Append (", ");
 488                                 sb.Append (o);
 489                         }
 490
 491                         sb.Append (")");
 492                         return sb.ToString ();
 493                 }
 494 */
 495         }
 496
 497         public abstract class AbstractMessage
 498         {
 499                 readonly string[] extra_info;
 500                 protected readonly int code;
 501                 protected readonly Location location;
 502                 readonly string message;
 503
 504                 protected AbstractMessage (int code, Location loc, string msg, List<string> extraInfo)
 505                 {
 506                         this.code = code;
 507                         if (code < 0)
 508                                 this.code = 8000 - code;
 509
 510                         this.location = loc;
 511                         this.message = msg;
 512                         if (extraInfo.Count != 0) {
 513                                 this.extra_info = extraInfo.ToArray ();
 514                         }
 515                 }
 516
 517                 protected AbstractMessage (AbstractMessage aMsg)
 518                 {
 519                         this.code = aMsg.code;
 520                         this.location = aMsg.location;
 521                         this.message = aMsg.message;
 522                         this.extra_info = aMsg.extra_info;
 523                 }
 524
 525                 public int Code {
 526                         get { return code; }
 527                 }
 528
 529                 public override bool Equals (object obj)
 530                 {
 531                         AbstractMessage msg = obj as AbstractMessage;
 532                         if (msg == null)
 533                                 return false;
 534
 535                         return code == msg.code && location.Equals (msg.location) && message == msg.message;
 536                 }
 537
 538                 public override int GetHashCode ()
 539                 {
 540                         return code.GetHashCode ();
 541                 }
 542
 543                 public abstract bool IsWarning { get; }
 544
 545                 public Location Location {
 546                         get { return location; }
 547                 }
 548
 549                 public abstract string MessageType { get; }
 550
 551                 public string[] RelatedSymbols {
 552                         get { return extra_info; }
 553                 }
 554
 555                 public string Text {
 556                         get { return message; }
 557                 }
 558         }
 559
 560         sealed class WarningMessage : AbstractMessage
 561         {
 562                 public WarningMessage (int code, Location loc, string message, List<string> extra_info)
 563                         : base (code, loc, message, extra_info)
 564                 {
 565                 }
 566
 567                 public override bool IsWarning {
 568                         get { return true; }
 569                 }
 570
 571                 public override string MessageType {
 572                         get {
 573                                 return "warning";
 574                         }
 575                 }
 576         }
 577
 578         sealed class ErrorMessage : AbstractMessage
 579         {
 580                 public ErrorMessage (int code, Location loc, string message, List<string> extraInfo)
 581                         : base (code, loc, message, extraInfo)
 582                 {
 583                 }
 584
 585                 public ErrorMessage (AbstractMessage aMsg)
 586                         : base (aMsg)
 587                 {
 588                 }
 589
 590                 public override bool IsWarning {
 591                         get { return false; }
 592                 }
 593
 594                 public override string MessageType {
 595                         get {
 596                                 return "error";
 597                         }
 598                 }
 599         }
 600
 601         //
 602         // Generic base for any message writer
 603         //
 604         public abstract class ReportPrinter {
 605                 /// <summary>
 606                 ///   Whether to dump a stack trace on errors.
 607                 /// </summary>
 608                 public bool Stacktrace;
 609
 610                 int warnings, errors;
 611
 612                 public int WarningsCount {
 613                         get { return warnings; }
 614                 }
 615
 616                 public int ErrorsCount {
 617                         get { return errors; }
 618                 }
 619
 620                 protected virtual string FormatText (string txt)
 621                 {
 622                         return txt;
 623                 }
 624
 625                 //
 626                 // When (symbols related to previous ...) can be used
 627                 //
 628                 public virtual bool HasRelatedSymbolSupport {
 629                         get { return true; }
 630                 }
 631
 632                 public virtual void Print (AbstractMessage msg)
 633                 {
 634                         if (msg.IsWarning)
 635                                 ++warnings;
 636                         else
 637                                 ++errors;
 638                 }
 639
 640                 protected void Print (AbstractMessage msg, TextWriter output)
 641                 {
 642                         StringBuilder txt = new StringBuilder ();
 643                         if (!msg.Location.IsNull) {
 644                                 txt.Append (msg.Location.ToString ());
 645                                 txt.Append (" ");
 646                         }
 647
 648                         txt.AppendFormat ("{0} CS{1:0000}: {2}", msg.MessageType, msg.Code, msg.Text);
 649
 650                         if (!msg.IsWarning)
 651                                 output.WriteLine (FormatText (txt.ToString ()));
 652                         else
 653                                 output.WriteLine (txt.ToString ());
 654
 655                         if (msg.RelatedSymbols != null) {
 656                                 foreach (string s in msg.RelatedSymbols)
 657                                         output.WriteLine (s + msg.MessageType + ")");
 658                         }
 659                 }
 660         }
 661
 662         //
 663         // Default message recorder, it uses two types of message groups.
 664         // Common messages: messages reported in all sessions.
 665         // Merged messages: union of all messages in all sessions.
 666         //
 667         // Used by the Lambda expressions to compile the code with various
 668         // parameter values, or by attribute resolver
 669         //
 670         class SessionReportPrinter : ReportPrinter
 671         {
 672                 List<AbstractMessage> session_messages;
 673                 //
 674                 // A collection of exactly same messages reported in all sessions
 675                 //
 676                 List<AbstractMessage> common_messages;
 677
 678                 //
 679                 // A collection of unique messages reported in all sessions
 680                 //
 681                 List<AbstractMessage> merged_messages;
 682
 683                 public override void Print (AbstractMessage msg)
 684                 {
 685                         //
 686                         // This line is useful when debugging recorded messages
 687                         //
 688                         // Console.WriteLine ("RECORDING: {0}", msg.ToString ());
 689
 690                         if (session_messages == null)
 691                                 session_messages = new List<AbstractMessage> ();
 692
 693                         session_messages.Add (msg);
 694
 695                         base.Print (msg);
 696                 }
 697
 698                 public void EndSession ()
 699                 {
 700                         if (session_messages == null)
 701                                 return;
 702
 703                         //
 704                         // Handles the first session
 705                         //
 706                         if (common_messages == null) {
 707                                 common_messages = new List<AbstractMessage> (session_messages);
 708                                 merged_messages = session_messages;
 709                                 session_messages = null;
 710                                 return;
 711                         }
 712
 713                         //
 714                         // Store common messages if any
 715                         //
 716                         for (int i = 0; i < common_messages.Count; ++i) {
 717                                 AbstractMessage cmsg = common_messages[i];
 718                                 bool common_msg_found = false;
 719                                 foreach (AbstractMessage msg in session_messages) {
 720                                         if (cmsg.Equals (msg)) {
 721                                                 common_msg_found = true;
 722                                                 break;
 723                                         }
 724                                 }
 725
 726                                 if (!common_msg_found)
 727                                         common_messages.RemoveAt (i);
 728                         }
 729
 730                         //
 731                         // Merge session and previous messages
 732                         //
 733                         for (int i = 0; i < session_messages.Count; ++i) {
 734                                 AbstractMessage msg = session_messages[i];
 735                                 bool msg_found = false;
 736                                 for (int ii = 0; ii < merged_messages.Count; ++ii) {
 737                                         if (msg.Equals (merged_messages[ii])) {
 738                                                 msg_found = true;
 739                                                 break;
 740                                         }
 741                                 }
 742
 743                                 if (!msg_found)
 744                                         merged_messages.Add (msg);
 745                         }
 746                 }
 747
 748                 public bool IsEmpty {
 749                         get {
 750                                 return merged_messages == null && common_messages == null;
 751                         }
 752                 }
 753
 754                 //
 755                 // Prints collected messages, common messages have a priority
 756                 //
 757                 public bool Merge (ReportPrinter dest)
 758                 {
 759                         var messages_to_print = merged_messages;
 760                         if (common_messages != null && common_messages.Count > 0) {
 761                                 messages_to_print = common_messages;
 762                         }
 763
 764                         if (messages_to_print == null)
 765                                 return false;
 766
 767                         bool error_msg = false;
 768                         foreach (AbstractMessage msg in messages_to_print) {
 769                                 dest.Print (msg);
 770                                 error_msg |= !msg.IsWarning;
 771                         }
 772
 773                         return error_msg;
 774                 }
 775         }
 776
 777         class StreamReportPrinter : ReportPrinter
 778         {
 779                 readonly TextWriter writer;
 780
 781                 public StreamReportPrinter (TextWriter writer)
 782                 {
 783                         this.writer = writer;
 784                 }
 785
 786                 public override void Print (AbstractMessage msg)
 787                 {
 788                         Print (msg, writer);
 789                         base.Print (msg);
 790                 }
 791         }
 792
 793         class ConsoleReportPrinter : StreamReportPrinter
 794         {
 795                 static readonly string prefix, postfix;
 796
 797                 static ConsoleReportPrinter ()
 798                 {
 799                         string term = Environment.GetEnvironmentVariable ("TERM");
 800                         bool xterm_colors = false;
 801
 802                         switch (term){
 803                         case "xterm":
 804                         case "rxvt":
 805                         case "rxvt-unicode":
 806                                 if (Environment.GetEnvironmentVariable ("COLORTERM") != null){
 807                                         xterm_colors = true;
 808                                 }
 809                                 break;
 810
 811                         case "xterm-color":
 812                                 xterm_colors = true;
 813                                 break;
 814                         }
 815                         if (!xterm_colors)
 816                                 return;
 817
 818                         if (!(UnixUtils.isatty (1) && UnixUtils.isatty (2)))
 819                                 return;
 820
 821                         string config = Environment.GetEnvironmentVariable ("MCS_COLORS");
 822                         if (config == null){
 823                                 config = "errors=red";
 824                                 //config = "brightwhite,red";
 825                         }
 826
 827                         if (config == "disable")
 828                                 return;
 829
 830                         if (!config.StartsWith ("errors="))
 831                                 return;
 832
 833                         config = config.Substring (7);
 834
 835                         int p = config.IndexOf (",");
 836                         if (p == -1)
 837                                 prefix = GetForeground (config);
 838                         else
 839                                 prefix = GetBackground (config.Substring (p+1)) + GetForeground (config.Substring (0, p));
 840                         postfix = "\x001b[0m";
 841                 }
 842
 843                 public ConsoleReportPrinter ()
 844                         : base (Console.Error)
 845                 {
 846                 }
 847
 848                 public ConsoleReportPrinter (TextWriter writer)
 849                         : base (writer)
 850                 {
 851                 }
 852
 853                 public int Fatal { get; set; }
 854
 855                 static int NameToCode (string s)
 856                 {
 857                         switch (s) {
 858                         case "black":
 859                                 return 0;
 860                         case "red":
 861                                 return 1;
 862                         case "green":
 863                                 return 2;
 864                         case "yellow":
 865                                 return 3;
 866                         case "blue":
 867                                 return 4;
 868                         case "magenta":
 869                                 return 5;
 870                         case "cyan":
 871                                 return 6;
 872                         case "grey":
 873                         case "white":
 874                                 return 7;
 875                         }
 876                         return 7;
 877                 }
 878
 879                 //
 880                 // maps a color name to its xterm color code
 881                 //
 882                 static string GetForeground (string s)
 883                 {
 884                         string highcode;
 885
 886                         if (s.StartsWith ("bright")) {
 887                                 highcode = "1;";
 888                                 s = s.Substring (6);
 889                         } else
 890                                 highcode = "";
 891
 892                         return "\x001b[" + highcode + (30 + NameToCode (s)).ToString () + "m";
 893                 }
 894
 895                 static string GetBackground (string s)
 896                 {
 897                         return "\x001b[" + (40 + NameToCode (s)).ToString () + "m";
 898                 }
 899
 900                 protected override string FormatText (string txt)
 901                 {
 902                         if (prefix != null)
 903                                 return prefix + txt + postfix;
 904
 905                         return txt;
 906                 }
 907
 908                 static string FriendlyStackTrace (StackTrace t)
 909                 {
 910                         StringBuilder sb = new StringBuilder ();
 911
 912                         bool foundUserCode = false;
 913
 914                         for (int i = 0; i < t.FrameCount; i++) {
 915                                 StackFrame f = t.GetFrame (i);
 916                                 var mb = f.GetMethod ();
 917
 918                                 if (!foundUserCode && mb.ReflectedType == typeof (Report))
 919                                         continue;
 920
 921                                 foundUserCode = true;
 922
 923                                 sb.Append ("\tin ");
 924
 925                                 if (f.GetFileLineNumber () > 0)
 926                                         sb.AppendFormat ("(at {0}:{1}) ", f.GetFileName (), f.GetFileLineNumber ());
 927
 928                                 sb.AppendFormat ("{0}.{1} (", mb.ReflectedType.Name, mb.Name);
 929
 930                                 bool first = true;
 931                                 foreach (var pi in mb.GetParameters ()) {
 932                                         if (!first)
 933                                                 sb.Append (", ");
 934                                         first = false;
 935
 936                                         sb.Append (pi.ParameterType.FullName);
 937                                 }
 938                                 sb.Append (")\n");
 939                         }
 940
 941                         return sb.ToString ();
 942                 }
 943
 944                 int print_count;
 945                 public override void Print (AbstractMessage msg)
 946                 {
 947                         base.Print (msg);
 948
 949                         if (Stacktrace)
 950                                 Console.WriteLine (FriendlyStackTrace (new StackTrace (true)));
 951
 952                         if (++print_count == Fatal)
 953                                 throw new Exception (msg.Text);
 954                 }
 955
 956                 public static string FriendlyStackTrace (Exception e)
 957                 {
 958                         return FriendlyStackTrace (new StackTrace (e, true));
 959                 }
 960
 961                 public static void StackTrace ()
 962                 {
 963                         Console.WriteLine (FriendlyStackTrace (new StackTrace (true)));
 964                 }
 965         }
 966
 967         public enum TimerType {
 968                 FindMembers     = 0,
 969                 TcFindMembers   = 1,
 970                 MemberLookup    = 2,
 971                 CachedLookup    = 3,
 972                 CacheInit       = 4,
 973                 MiscTimer       = 5,
 974                 CountTimers     = 6
 975         }
 976
 977         public enum CounterType {
 978                 FindMembers     = 0,
 979                 MemberCache     = 1,
 980                 MiscCounter     = 2,
 981                 CountCounters   = 3
 982         }
 983
 984         public class Timer
 985         {
 986                 static DateTime[] timer_start;
 987                 static TimeSpan[] timers;
 988                 static long[] timer_counters;
 989                 static long[] counters;
 990
 991                 static Timer ()
 992                 {
 993                         timer_start = new DateTime [(int) TimerType.CountTimers];
 994                         timers = new TimeSpan [(int) TimerType.CountTimers];
 995                         timer_counters = new long [(int) TimerType.CountTimers];
 996                         counters = new long [(int) CounterType.CountCounters];
 997
 998                         for (int i = 0; i < (int) TimerType.CountTimers; i++) {
 999                                 timer_start [i] = DateTime.Now;
1000                                 timers [i] = TimeSpan.Zero;
1001                         }
1002                 }
1003
1004                 [Conditional("TIMER")]
1005                 static public void IncrementCounter (CounterType which)
1006                 {
1007                         ++counters [(int) which];
1008                 }
1009
1010                 [Conditional("TIMER")]
1011                 static public void StartTimer (TimerType which)
1012                 {
1013                         timer_start [(int) which] = DateTime.Now;
1014                 }
1015
1016                 [Conditional("TIMER")]
1017                 static public void StopTimer (TimerType which)
1018                 {
1019                         timers [(int) which] += DateTime.Now - timer_start [(int) which];
1020                         ++timer_counters [(int) which];
1021                 }
1022
1023                 [Conditional("TIMER")]
1024                 static public void ShowTimers ()
1025                 {
1026                         ShowTimer (TimerType.FindMembers, "- FindMembers timer");
1027                         ShowTimer (TimerType.TcFindMembers, "- TypeContainer.FindMembers timer");
1028                         ShowTimer (TimerType.MemberLookup, "- MemberLookup timer");
1029                         ShowTimer (TimerType.CachedLookup, "- CachedLookup timer");
1030                         ShowTimer (TimerType.CacheInit, "- Cache init");
1031                         ShowTimer (TimerType.MiscTimer, "- Misc timer");
1032
1033                         ShowCounter (CounterType.FindMembers, "- Find members");
1034                         ShowCounter (CounterType.MemberCache, "- Member cache");
1035                         ShowCounter (CounterType.MiscCounter, "- Misc counter");
1036                 }
1037
1038                 static public void ShowCounter (CounterType which, string msg)
1039                 {
1040                         Console.WriteLine ("{0} {1}", counters [(int) which], msg);
1041                 }
1042
1043                 static public void ShowTimer (TimerType which, string msg)
1044                 {
1045                         Console.WriteLine (
1046                                 "[{0:00}:{1:000}] {2} (used {3} times)",
1047                                 (int) timers [(int) which].TotalSeconds,
1048                                 timers [(int) which].Milliseconds, msg,
1049                                 timer_counters [(int) which]);
1050                 }
1051         }
1052
1053         public class InternalErrorException : Exception {
1054                 public InternalErrorException (MemberCore mc, Exception e)
1055                         : base (mc.Location + " " + mc.GetSignatureForError (), e)
1056                 {
1057                 }
1058
1059                 public InternalErrorException ()
1060                         : base ("Internal error")
1061                 {
1062                 }
1063
1064                 public InternalErrorException (string message)
1065                         : base (message)
1066                 {
1067                 }
1068
1069                 public InternalErrorException (string message, params object[] args)
1070                         : base (String.Format (message, args))
1071                 {
1072                 }
1073
1074                 public InternalErrorException (Exception exception, string message, params object[] args)
1075                         : base (String.Format (message, args), exception)
1076                 {
1077                 }
1078
1079                 public InternalErrorException (Exception e, Location loc)
1080                         : base (loc.ToString (), e)
1081                 {
1082                 }
1083         }
1084
1085         /// <summary>
1086         /// Handles #pragma warning
1087         /// </summary>
1088         public class WarningRegions {
1089
1090                 abstract class PragmaCmd
1091                 {
1092                         public int Line;
1093
1094                         protected PragmaCmd (int line)
1095                         {
1096                                 Line = line;
1097                         }
1098
1099                         public abstract bool IsEnabled (int code, bool previous);
1100                 }
1101
1102                 class Disable : PragmaCmd
1103                 {
1104                         int code;
1105                         public Disable (int line, int code)
1106                                 : base (line)
1107                         {
1108                                 this.code = code;
1109                         }
1110
1111                         public override bool IsEnabled (int code, bool previous)
1112                         {
1113                                 return this.code == code ? false : previous;
1114                         }
1115                 }
1116
1117                 class DisableAll : PragmaCmd
1118                 {
1119                         public DisableAll (int line)
1120                                 : base (line) {}
1121
1122                         public override bool IsEnabled(int code, bool previous)
1123                         {
1124                                 return false;
1125                         }
1126                 }
1127
1128                 class Enable : PragmaCmd
1129                 {
1130                         int code;
1131                         public Enable (int line, int code)
1132                                 : base (line)
1133                         {
1134                                 this.code = code;
1135                         }
1136
1137                         public override bool IsEnabled(int code, bool previous)
1138                         {
1139                                 return this.code == code ? true : previous;
1140                         }
1141                 }
1142
1143                 class EnableAll : PragmaCmd
1144                 {
1145                         public EnableAll (int line)
1146                                 : base (line) {}
1147
1148                         public override bool IsEnabled(int code, bool previous)
1149                         {
1150                                 return true;
1151                         }
1152                 }
1153
1154
1155                 List<PragmaCmd> regions = new List<PragmaCmd> ();
1156
1157                 public void WarningDisable (int line)
1158                 {
1159                         regions.Add (new DisableAll (line));
1160                 }
1161
1162                 public void WarningDisable (Location location, int code, Report Report)
1163                 {
1164                         if (Report.CheckWarningCode (code, location))
1165                                 regions.Add (new Disable (location.Row, code));
1166                 }
1167
1168                 public void WarningEnable (int line)
1169                 {
1170                         regions.Add (new EnableAll (line));
1171                 }
1172
1173                 public void WarningEnable (Location location, int code, Report Report)
1174                 {
1175                         if (!Report.CheckWarningCode (code, location))
1176                                 return;
1177
1178                         if (Report.IsWarningDisabledGlobally (code))
1179                                 Report.Warning (1635, 1, location, "Cannot restore warning `CS{0:0000}' because it was disabled globally", code);
1180
1181                         regions.Add (new Enable (location.Row, code));
1182                 }
1183
1184                 public bool IsWarningEnabled (int code, int src_line)
1185                 {
1186                         bool result = true;
1187                         foreach (PragmaCmd pragma in regions) {
1188                                 if (src_line < pragma.Line)
1189                                         break;
1190
1191                                 result = pragma.IsEnabled (code, result);
1192                         }
1193                         return result;
1194                 }
1195         }
1196 }