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 using System.Reflection;
  16 using System.Reflection.Emit;
  17
  18 namespace Mono.CSharp {
  19
  20         //
  21         // Errors and warnings manager
  22         //
  23         public class Report
  24         {
  25                 /// <summary>
  26                 ///   Whether warnings should be considered errors
  27                 /// </summary>
  28                 public bool WarningsAreErrors;
  29                 List<int> warnings_as_error;
  30                 List<int> warnings_only;
  31
  32                 public static int DebugFlags = 0;
  33
  34                 //
  35                 // Keeps track of the warnings that we are ignoring
  36                 //
  37                 public Dictionary<int, bool> warning_ignore_table;
  38
  39                 Dictionary<string, 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                         809,
  62                         1030, 1058, 1066,
  63                         1522, 1570, 1571, 1572, 1573, 1574, 1580, 1581, 1584, 1587, 1589, 1590, 1591, 1592,
  64                         1616, 1633, 1634, 1635, 1685, 1690, 1691, 1692,
  65                         1700, 1717, 1718, 1720,
  66                         1901,
  67                         2002, 2023, 2029,
  68                         3000, 3001, 3002, 3003, 3005, 3006, 3007, 3008, 3009,
  69                         3010, 3011, 3012, 3013, 3014, 3015, 3016, 3017, 3018, 3019,
  70                         3021, 3022, 3023, 3024, 3026, 3027
  71                 };
  72
  73                 static Report ()
  74                 {
  75                         // Just to be sure that binary search is working
  76                         Array.Sort (AllWarnings);
  77                 }
  78
  79                 public Report (ReportPrinter printer)
  80                 {
  81                         if (printer == null)
  82                                 throw new ArgumentNullException ("printer");
  83
  84                         this.printer = printer;
  85                         warning_level = 4;
  86                 }
  87
  88                 public void DisableReporting ()
  89                 {
  90                         ++reporting_disabled;
  91                 }
  92
  93                 public void EnableReporting ()
  94                 {
  95                         --reporting_disabled;
  96                 }
  97
  98                 public void FeatureIsNotAvailable (Location loc, string feature)
  99                 {
 100                         string version;
 101                         switch (RootContext.Version) {
 102                         case LanguageVersion.ISO_1:
 103                                 version = "1.0";
 104                                 break;
 105                         case LanguageVersion.ISO_2:
 106                                 version = "2.0";
 107                                 break;
 108                         case LanguageVersion.V_3:
 109                                 version = "3.0";
 110                                 break;
 111                         default:
 112                                 throw new InternalErrorException ("Invalid feature version", RootContext.Version);
 113                         }
 114
 115                         Error (1644, loc,
 116                                 "Feature `{0}' cannot be used because it is not part of the C# {1} language specification",
 117                                       feature, version);
 118                 }
 119
 120                 public void FeatureIsNotSupported (Location loc, string feature)
 121                 {
 122                         Error (1644, loc,
 123                                 "Feature `{0}' is not supported in Mono mcs1 compiler. Consider using the `gmcs' compiler instead",
 124                                 feature);
 125                 }
 126
 127                 static bool IsValidWarning (int code)
 128                 {
 129                         return Array.BinarySearch (AllWarnings, code) >= 0;
 130                 }
 131
 132                 bool IsWarningEnabled (int code, int level, Location loc)
 133                 {
 134                         if (WarningLevel < level)
 135                                 return false;
 136
 137                         if (warning_ignore_table != null) {
 138                                 if (warning_ignore_table.ContainsKey (code)) {
 139                                         return false;
 140                                 }
 141                         }
 142
 143                         if (warning_regions_table == null || loc.IsNull)
 144                                 return true;
 145
 146                         WarningRegions regions;
 147                         if (!warning_regions_table.TryGetValue (loc.Name, out regions))
 148                                 return true;
 149
 150                         return regions.IsWarningEnabled (code, loc.Row);
 151                 }
 152
 153                 bool IsWarningAsError (int code)
 154                 {
 155                         bool is_error = WarningsAreErrors;
 156
 157                         // Check specific list
 158                         if (warnings_as_error != null)
 159                                 is_error |= warnings_as_error.Contains (code);
 160
 161                         // Ignore excluded warnings
 162                         if (warnings_only != null && warnings_only.Contains (code))
 163                                 is_error = false;
 164
 165                         return is_error;
 166                 }
 167
 168                 public void RuntimeMissingSupport (Location loc, string feature)
 169                 {
 170                         Error (-88, loc, "Your .NET Runtime does not support `{0}'. Please use the latest Mono runtime instead.", feature);
 171                 }
 172
 173                 /// <summary>
 174                 /// In most error cases is very useful to have information about symbol that caused the error.
 175                 /// Call this method before you call Report.Error when it makes sense.
 176                 /// </summary>
 177                 public void SymbolRelatedToPreviousError (Location loc, string symbol)
 178                 {
 179                         SymbolRelatedToPreviousError (loc.ToString (), symbol);
 180                 }
 181
 182                 public void SymbolRelatedToPreviousError (MemberInfo mi)
 183                 {
 184                         if (reporting_disabled > 0 || !printer.HasRelatedSymbolSupport)
 185                                 return;
 186
 187                         Type dt = TypeManager.DropGenericTypeArguments (mi.DeclaringType);
 188                         if (TypeManager.IsDelegateType (dt)) {
 189                                 SymbolRelatedToPreviousError (dt);
 190                                 return;
 191                         }
 192
 193                         DeclSpace temp_ds = TypeManager.LookupDeclSpace (dt);
 194                         if (temp_ds == null) {
 195                                 SymbolRelatedToPreviousError (dt.Assembly.Location, TypeManager.GetFullNameSignature (mi));
 196                         } else {
 197                                 MethodBase mb = mi as MethodBase;
 198                                 if (mb != null) {
 199                                         mb = TypeManager.DropGenericMethodArguments (mb);
 200                                         IMethodData md = TypeManager.GetMethod (mb);
 201                                         if (md != null)
 202                                                 SymbolRelatedToPreviousError (md.Location, md.GetSignatureForError ());
 203
 204                                         return;
 205                                 }
 206
 207                                 // FIXME: Completely wrong, it has to use FindMembers
 208                                 MemberCore mc = temp_ds.GetDefinition (mi.Name);
 209                                 if (mc != null)
 210                                         SymbolRelatedToPreviousError (mc);
 211                         }
 212                 }
 213
 214                 public void SymbolRelatedToPreviousError (MemberCore mc)
 215                 {
 216                         SymbolRelatedToPreviousError (mc.Location, mc.GetSignatureForError ());
 217                 }
 218
 219                 public void SymbolRelatedToPreviousError (Type type)
 220                 {
 221                         if (reporting_disabled > 0 || !printer.HasRelatedSymbolSupport)
 222                                 return;
 223
 224                         type = TypeManager.DropGenericTypeArguments (type);
 225
 226                         if (TypeManager.IsGenericParameter (type)) {
 227                                 TypeParameter tp = TypeManager.LookupTypeParameter (type);
 228                                 if (tp != null) {
 229                                         SymbolRelatedToPreviousError (tp.Location, "");
 230                                         return;
 231                                 }
 232                         }
 233
 234                         if (type is TypeBuilder) {
 235                                 DeclSpace temp_ds = TypeManager.LookupDeclSpace (type);
 236                                 SymbolRelatedToPreviousError (temp_ds.Location, TypeManager.CSharpName (type));
 237                         } else if (TypeManager.HasElementType (type)) {
 238                                 SymbolRelatedToPreviousError (TypeManager.GetElementType (type));
 239                         } else {
 240                                 SymbolRelatedToPreviousError (type.Assembly.Location, TypeManager.CSharpName (type));
 241                         }
 242                 }
 243
 244                 void SymbolRelatedToPreviousError (string loc, string symbol)
 245                 {
 246                         string msg = String.Format ("{0} (Location of the symbol related to previous ", loc);
 247                         if (extra_information.Contains (msg))
 248                                 return;
 249
 250                         extra_information.Add (msg);
 251                 }
 252
 253                 public void AddWarningAsError (string warningId)
 254                 {
 255                         int id;
 256                         try {
 257                                 id = int.Parse (warningId);
 258                         } catch {
 259                                 id = -1;
 260                         }
 261
 262                         if (!CheckWarningCode (id, warningId, Location.Null))
 263                                 return;
 264
 265                         if (warnings_as_error == null)
 266                                 warnings_as_error = new List<int> ();
 267
 268                         warnings_as_error.Add (id);
 269                 }
 270
 271                 public void RemoveWarningAsError (string warningId)
 272                 {
 273                         int id;
 274                         try {
 275                                 id = int.Parse (warningId);
 276                         } catch {
 277                                 id = -1;
 278                         }
 279
 280                         if (!CheckWarningCode (id, warningId, Location.Null))
 281                                 return;
 282
 283                         if (warnings_only == null)
 284                                 warnings_only = new List<int> ();
 285
 286                         warnings_only.Add (id);
 287                 }
 288
 289                 public bool CheckWarningCode (int code, Location loc)
 290                 {
 291                         return CheckWarningCode (code, code.ToString (), loc);
 292                 }
 293
 294                 public bool CheckWarningCode (int code, string scode, Location loc)
 295                 {
 296                         if (IsValidWarning (code))
 297                                 return true;
 298
 299                         Warning (1691, 1, loc, "`{0}' is not a valid warning number", scode);
 300                         return false;
 301                 }
 302
 303                 public void ExtraInformation (Location loc, string msg)
 304                 {
 305                         extra_information.Add (String.Format ("{0} {1}", loc, msg));
 306                 }
 307
 308                 public WarningRegions RegisterWarningRegion (Location location)
 309                 {
 310                         WarningRegions regions;
 311                         if (warning_regions_table == null) {
 312                                 regions = null;
 313                                 warning_regions_table = new Dictionary<string, WarningRegions> ();
 314                         } else {
 315                                 warning_regions_table.TryGetValue (location.Name, out regions);
 316                         }
 317
 318                         if (regions == null) {
 319                                 regions = new WarningRegions ();
 320                                 warning_regions_table.Add (location.Name, regions);
 321                         }
 322
 323                         return regions;
 324                 }
 325
 326                 public void Warning (int code, int level, Location loc, string message)
 327                 {
 328                         if (reporting_disabled > 0)
 329                                 return;
 330
 331                         if (!IsWarningEnabled (code, level, loc))
 332                                 return;
 333
 334                         AbstractMessage msg;
 335                         if (IsWarningAsError (code))
 336                                 msg = new ErrorMessage (code, loc, message, extra_information);
 337                         else
 338                                 msg = new WarningMessage (code, loc, message, extra_information);
 339
 340                         extra_information.Clear ();
 341                         printer.Print (msg);
 342                 }
 343
 344                 public void Warning (int code, int level, Location loc, string format, string arg)
 345                 {
 346                         Warning (code, level, loc, String.Format (format, arg));
 347                 }
 348
 349                 public void Warning (int code, int level, Location loc, string format, string arg1, string arg2)
 350                 {
 351                         Warning (code, level, loc, String.Format (format, arg1, arg2));
 352                 }
 353
 354                 public void Warning (int code, int level, Location loc, string format, params object[] args)
 355                 {
 356                         Warning (code, level, loc, String.Format (format, args));
 357                 }
 358
 359                 public void Warning (int code, int level, string message)
 360                 {
 361                         Warning (code, level, Location.Null, message);
 362                 }
 363
 364                 public void Warning (int code, int level, string format, string arg)
 365                 {
 366                         Warning (code, level, Location.Null, format, arg);
 367                 }
 368
 369                 public void Warning (int code, int level, string format, string arg1, string arg2)
 370                 {
 371                         Warning (code, level, Location.Null, format, arg1, arg2);
 372                 }
 373
 374                 public void Warning (int code, int level, string format, params string[] args)
 375                 {
 376                         Warning (code, level, Location.Null, String.Format (format, args));
 377                 }
 378
 379                 //
 380                 // Warnings encountered so far
 381                 //
 382                 public int Warnings {
 383                         get { return printer.WarningsCount; }
 384                 }
 385
 386                 public void Error (int code, Location loc, string error)
 387                 {
 388                         if (reporting_disabled > 0)
 389                                 return;
 390
 391                         ErrorMessage msg = new ErrorMessage (code, loc, error, extra_information);
 392                         extra_information.Clear ();
 393
 394                         printer.Print (msg);
 395                 }
 396
 397                 public void Error (int code, Location loc, string format, string arg)
 398                 {
 399                         Error (code, loc, String.Format (format, arg));
 400                 }
 401
 402                 public void Error (int code, Location loc, string format, string arg1, string arg2)
 403                 {
 404                         Error (code, loc, String.Format (format, arg1, arg2));
 405                 }
 406
 407                 public void Error (int code, Location loc, string format, params object[] args)
 408                 {
 409                         Error (code, loc, String.Format (format, args));
 410                 }
 411
 412                 public void Error (int code, string error)
 413                 {
 414                         Error (code, Location.Null, error);
 415                 }
 416
 417                 public void Error (int code, string format, string arg)
 418                 {
 419                         Error (code, Location.Null, format, arg);
 420                 }
 421
 422                 public void Error (int code, string format, string arg1, string arg2)
 423                 {
 424                         Error (code, Location.Null, format, arg1, arg2);
 425                 }
 426
 427                 public void Error (int code, string format, params string[] args)
 428                 {
 429                         Error (code, Location.Null, String.Format (format, args));
 430                 }
 431
 432                 //
 433                 // Errors encountered so far
 434                 //
 435                 public int Errors {
 436                         get { return printer.ErrorsCount; }
 437                 }
 438
 439                 public ReportPrinter Printer {
 440                         get { return printer; }
 441                 }
 442
 443                 public void SetIgnoreWarning (int code)
 444                 {
 445                         if (warning_ignore_table == null)
 446                                 warning_ignore_table = new Dictionary<int, bool> ();
 447
 448                         warning_ignore_table [code] = true;
 449                 }
 450
 451                 public ReportPrinter SetPrinter (ReportPrinter printer)
 452                 {
 453                         ReportPrinter old = this.printer;
 454                         this.printer = printer;
 455                         return old;
 456                 }
 457
 458                 public int WarningLevel {
 459                         get {
 460                                 return warning_level;
 461                         }
 462                         set {
 463                                 warning_level = value;
 464                         }
 465                 }
 466
 467                 [Conditional ("MCS_DEBUG")]
 468                 static public void Debug (string message, params object[] args)
 469                 {
 470                         Debug (4, message, args);
 471                 }
 472
 473                 [Conditional ("MCS_DEBUG")]
 474                 static public void Debug (int category, string message, params object[] args)
 475                 {
 476                         if ((category & DebugFlags) == 0)
 477                                 return;
 478
 479                         StringBuilder sb = new StringBuilder (message);
 480
 481                         if ((args != null) && (args.Length > 0)) {
 482                                 sb.Append (": ");
 483
 484                                 bool first = true;
 485                                 foreach (object arg in args) {
 486                                         if (first)
 487                                                 first = false;
 488                                         else
 489                                                 sb.Append (", ");
 490                                         if (arg == null)
 491                                                 sb.Append ("null");
 492 //                                      else if (arg is ICollection)
 493 //                                              sb.Append (PrintCollection ((ICollection) arg));
 494                                         else
 495                                                 sb.Append (arg);
 496                                 }
 497                         }
 498
 499                         Console.WriteLine (sb.ToString ());
 500                 }
 501 /*
 502                 static public string PrintCollection (ICollection collection)
 503                 {
 504                         StringBuilder sb = new StringBuilder ();
 505
 506                         sb.Append (collection.GetType ());
 507                         sb.Append ("(");
 508
 509                         bool first = true;
 510                         foreach (object o in collection) {
 511                                 if (first)
 512                                         first = false;
 513                                 else
 514                                         sb.Append (", ");
 515                                 sb.Append (o);
 516                         }
 517
 518                         sb.Append (")");
 519                         return sb.ToString ();
 520                 }
 521 */
 522         }
 523
 524         public abstract class AbstractMessage
 525         {
 526                 readonly string[] extra_info;
 527                 protected readonly int code;
 528                 protected readonly Location location;
 529                 readonly string message;
 530
 531                 protected AbstractMessage (int code, Location loc, string msg, List<string> extraInfo)
 532                 {
 533                         this.code = code;
 534                         if (code < 0)
 535                                 this.code = 8000 - code;
 536
 537                         this.location = loc;
 538                         this.message = msg;
 539                         if (extraInfo.Count != 0) {
 540                                 this.extra_info = extraInfo.ToArray ();
 541                         }
 542                 }
 543
 544                 protected AbstractMessage (AbstractMessage aMsg)
 545                 {
 546                         this.code = aMsg.code;
 547                         this.location = aMsg.location;
 548                         this.message = aMsg.message;
 549                         this.extra_info = aMsg.extra_info;
 550                 }
 551
 552                 public int Code {
 553                         get { return code; }
 554                 }
 555
 556                 public override bool Equals (object obj)
 557                 {
 558                         AbstractMessage msg = obj as AbstractMessage;
 559                         if (msg == null)
 560                                 return false;
 561
 562                         return code == msg.code && location.Equals (msg.location) && message == msg.message;
 563                 }
 564
 565                 public override int GetHashCode ()
 566                 {
 567                         return code.GetHashCode ();
 568                 }
 569
 570                 public abstract bool IsWarning { get; }
 571
 572                 public Location Location {
 573                         get { return location; }
 574                 }
 575
 576                 public abstract string MessageType { get; }
 577
 578                 public string[] RelatedSymbols {
 579                         get { return extra_info; }
 580                 }
 581
 582                 public string Text {
 583                         get { return message; }
 584                 }
 585         }
 586
 587         sealed class WarningMessage : AbstractMessage
 588         {
 589                 public WarningMessage (int code, Location loc, string message, List<string> extra_info)
 590                         : base (code, loc, message, extra_info)
 591                 {
 592                 }
 593
 594                 public override bool IsWarning {
 595                         get { return true; }
 596                 }
 597
 598                 public override string MessageType {
 599                         get {
 600                                 return "warning";
 601                         }
 602                 }
 603         }
 604
 605         sealed class ErrorMessage : AbstractMessage
 606         {
 607                 public ErrorMessage (int code, Location loc, string message, List<string> extraInfo)
 608                         : base (code, loc, message, extraInfo)
 609                 {
 610                 }
 611
 612                 public ErrorMessage (AbstractMessage aMsg)
 613                         : base (aMsg)
 614                 {
 615                 }
 616
 617                 public override bool IsWarning {
 618                         get { return false; }
 619                 }
 620
 621                 public override string MessageType {
 622                         get {
 623                                 return "error";
 624                         }
 625                 }
 626         }
 627
 628         //
 629         // Generic base for any message writer
 630         //
 631         public abstract class ReportPrinter {
 632                 /// <summary>
 633                 ///   Whether to dump a stack trace on errors.
 634                 /// </summary>
 635                 public bool Stacktrace;
 636
 637                 int warnings, errors;
 638
 639                 public int WarningsCount {
 640                         get { return warnings; }
 641                 }
 642
 643                 public int ErrorsCount {
 644                         get { return errors; }
 645                 }
 646
 647                 protected virtual string FormatText (string txt)
 648                 {
 649                         return txt;
 650                 }
 651
 652                 //
 653                 // When (symbols related to previous ...) can be used
 654                 //
 655                 public virtual bool HasRelatedSymbolSupport {
 656                         get { return true; }
 657                 }
 658
 659                 public virtual void Print (AbstractMessage msg)
 660                 {
 661                         if (msg.IsWarning)
 662                                 ++warnings;
 663                         else
 664                                 ++errors;
 665                 }
 666
 667                 protected void Print (AbstractMessage msg, TextWriter output)
 668                 {
 669                         StringBuilder txt = new StringBuilder ();
 670                         if (!msg.Location.IsNull) {
 671                                 txt.Append (msg.Location.ToString ());
 672                                 txt.Append (" ");
 673                         }
 674
 675                         txt.AppendFormat ("{0} CS{1:0000}: {2}", msg.MessageType, msg.Code, msg.Text);
 676
 677                         if (!msg.IsWarning)
 678                                 output.WriteLine (FormatText (txt.ToString ()));
 679                         else
 680                                 output.WriteLine (txt.ToString ());
 681
 682                         if (msg.RelatedSymbols != null) {
 683                                 foreach (string s in msg.RelatedSymbols)
 684                                         output.WriteLine (s + msg.MessageType + ")");
 685                         }
 686                 }
 687         }
 688
 689         //
 690         // Default message recorder, it uses two types of message groups.
 691         // Common messages: messages reported in all sessions.
 692         // Merged messages: union of all messages in all sessions.
 693         //
 694         // Used by the Lambda expressions to compile the code with various
 695         // parameter values, or by attribute resolver
 696         //
 697         class SessionReportPrinter : ReportPrinter
 698         {
 699                 List<AbstractMessage> session_messages;
 700                 //
 701                 // A collection of exactly same messages reported in all sessions
 702                 //
 703                 List<AbstractMessage> common_messages;
 704
 705                 //
 706                 // A collection of unique messages reported in all sessions
 707                 //
 708                 List<AbstractMessage> merged_messages;
 709
 710                 public override void Print (AbstractMessage msg)
 711                 {
 712                         //
 713                         // This line is useful when debugging recorded messages
 714                         //
 715                         // Console.WriteLine ("RECORDING: {0} {1} {2}", code, location, message);
 716
 717                         if (session_messages == null)
 718                                 session_messages = new List<AbstractMessage> ();
 719
 720                         session_messages.Add (msg);
 721
 722                         base.Print (msg);
 723                 }
 724
 725                 public void EndSession ()
 726                 {
 727                         if (session_messages == null)
 728                                 return;
 729
 730                         //
 731                         // Handles the first session
 732                         //
 733                         if (common_messages == null) {
 734                                 common_messages = new List<AbstractMessage> (session_messages);
 735                                 merged_messages = session_messages;
 736                                 session_messages = null;
 737                                 return;
 738                         }
 739
 740                         //
 741                         // Store common messages if any
 742                         //
 743                         for (int i = 0; i < common_messages.Count; ++i) {
 744                                 AbstractMessage cmsg = (AbstractMessage) common_messages[i];
 745                                 bool common_msg_found = false;
 746                                 foreach (AbstractMessage msg in session_messages) {
 747                                         if (cmsg.Equals (msg)) {
 748                                                 common_msg_found = true;
 749                                                 break;
 750                                         }
 751                                 }
 752
 753                                 if (!common_msg_found)
 754                                         common_messages.RemoveAt (i);
 755                         }
 756
 757                         //
 758                         // Merge session and previous messages
 759                         //
 760                         for (int i = 0; i < session_messages.Count; ++i) {
 761                                 AbstractMessage msg = (AbstractMessage) session_messages[i];
 762                                 bool msg_found = false;
 763                                 for (int ii = 0; ii < merged_messages.Count; ++ii) {
 764                                         if (msg.Equals (merged_messages[ii])) {
 765                                                 msg_found = true;
 766                                                 break;
 767                                         }
 768                                 }
 769
 770                                 if (!msg_found)
 771                                         merged_messages.Add (msg);
 772                         }
 773                 }
 774
 775                 public bool IsEmpty {
 776                         get {
 777                                 return merged_messages == null && common_messages == null;
 778                         }
 779                 }
 780
 781                 //
 782                 // Prints collected messages, common messages have a priority
 783                 //
 784                 public bool Merge (ReportPrinter dest)
 785                 {
 786                         var messages_to_print = merged_messages;
 787                         if (common_messages != null && common_messages.Count > 0) {
 788                                 messages_to_print = common_messages;
 789                         }
 790
 791                         if (messages_to_print == null)
 792                                 return false;
 793
 794                         foreach (AbstractMessage msg in messages_to_print)
 795                                 dest.Print (msg);
 796
 797                         return true;
 798                 }
 799         }
 800
 801         class StreamReportPrinter : ReportPrinter
 802         {
 803                 readonly TextWriter writer;
 804
 805                 public StreamReportPrinter (TextWriter writer)
 806                 {
 807                         this.writer = writer;
 808                 }
 809
 810                 public override void Print (AbstractMessage msg)
 811                 {
 812                         Print (msg, writer);
 813                         base.Print (msg);
 814                 }
 815         }
 816
 817         class ConsoleReportPrinter : StreamReportPrinter
 818         {
 819                 static readonly string prefix, postfix;
 820
 821                 static ConsoleReportPrinter ()
 822                 {
 823                         string term = Environment.GetEnvironmentVariable ("TERM");
 824                         bool xterm_colors = false;
 825
 826                         switch (term){
 827                         case "xterm":
 828                         case "rxvt":
 829                         case "rxvt-unicode":
 830                                 if (Environment.GetEnvironmentVariable ("COLORTERM") != null){
 831                                         xterm_colors = true;
 832                                 }
 833                                 break;
 834
 835                         case "xterm-color":
 836                                 xterm_colors = true;
 837                                 break;
 838                         }
 839                         if (!xterm_colors)
 840                                 return;
 841
 842                         if (!(UnixUtils.isatty (1) && UnixUtils.isatty (2)))
 843                                 return;
 844
 845                         string config = Environment.GetEnvironmentVariable ("MCS_COLORS");
 846                         if (config == null){
 847                                 config = "errors=red";
 848                                 //config = "brightwhite,red";
 849                         }
 850
 851                         if (config == "disable")
 852                                 return;
 853
 854                         if (!config.StartsWith ("errors="))
 855                                 return;
 856
 857                         config = config.Substring (7);
 858
 859                         int p = config.IndexOf (",");
 860                         if (p == -1)
 861                                 prefix = GetForeground (config);
 862                         else
 863                                 prefix = GetBackground (config.Substring (p+1)) + GetForeground (config.Substring (0, p));
 864                         postfix = "\x001b[0m";
 865                 }
 866
 867                 public ConsoleReportPrinter ()
 868                         : base (Console.Error)
 869                 {
 870                 }
 871
 872                 public ConsoleReportPrinter (TextWriter writer)
 873                         : base (writer)
 874                 {
 875                 }
 876
 877                 public int Fatal { get; set; }
 878
 879                 static int NameToCode (string s)
 880                 {
 881                         switch (s) {
 882                         case "black":
 883                                 return 0;
 884                         case "red":
 885                                 return 1;
 886                         case "green":
 887                                 return 2;
 888                         case "yellow":
 889                                 return 3;
 890                         case "blue":
 891                                 return 4;
 892                         case "magenta":
 893                                 return 5;
 894                         case "cyan":
 895                                 return 6;
 896                         case "grey":
 897                         case "white":
 898                                 return 7;
 899                         }
 900                         return 7;
 901                 }
 902
 903                 //
 904                 // maps a color name to its xterm color code
 905                 //
 906                 static string GetForeground (string s)
 907                 {
 908                         string highcode;
 909
 910                         if (s.StartsWith ("bright")) {
 911                                 highcode = "1;";
 912                                 s = s.Substring (6);
 913                         } else
 914                                 highcode = "";
 915
 916                         return "\x001b[" + highcode + (30 + NameToCode (s)).ToString () + "m";
 917                 }
 918
 919                 static string GetBackground (string s)
 920                 {
 921                         return "\x001b[" + (40 + NameToCode (s)).ToString () + "m";
 922                 }
 923
 924                 protected override string FormatText (string txt)
 925                 {
 926                         if (prefix != null)
 927                                 return prefix + txt + postfix;
 928
 929                         return txt;
 930                 }
 931
 932                 static string FriendlyStackTrace (StackTrace t)
 933                 {
 934                         StringBuilder sb = new StringBuilder ();
 935
 936                         bool foundUserCode = false;
 937
 938                         for (int i = 0; i < t.FrameCount; i++) {
 939                                 StackFrame f = t.GetFrame (i);
 940                                 MethodBase mb = f.GetMethod ();
 941
 942                                 if (!foundUserCode && mb.ReflectedType == typeof (Report))
 943                                         continue;
 944
 945                                 foundUserCode = true;
 946
 947                                 sb.Append ("\tin ");
 948
 949                                 if (f.GetFileLineNumber () > 0)
 950                                         sb.AppendFormat ("(at {0}:{1}) ", f.GetFileName (), f.GetFileLineNumber ());
 951
 952                                 sb.AppendFormat ("{0}.{1} (", mb.ReflectedType.Name, mb.Name);
 953
 954                                 bool first = true;
 955                                 foreach (ParameterInfo pi in mb.GetParameters ()) {
 956                                         if (!first)
 957                                                 sb.Append (", ");
 958                                         first = false;
 959
 960                                         sb.Append (TypeManager.CSharpName (pi.ParameterType));
 961                                 }
 962                                 sb.Append (")\n");
 963                         }
 964
 965                         return sb.ToString ();
 966                 }
 967
 968                 int print_count;
 969                 public override void Print (AbstractMessage msg)
 970                 {
 971                         base.Print (msg);
 972
 973                         if (Stacktrace)
 974                                 Console.WriteLine (FriendlyStackTrace (new StackTrace (true)));
 975
 976                         if (++print_count == Fatal)
 977                                 throw new Exception (msg.Text);
 978                 }
 979
 980                 public static string FriendlyStackTrace (Exception e)
 981                 {
 982                         return FriendlyStackTrace (new StackTrace (e, true));
 983                 }
 984
 985                 public static void StackTrace ()
 986                 {
 987                         Console.WriteLine (FriendlyStackTrace (new StackTrace (true)));
 988                 }
 989         }
 990
 991         public enum TimerType {
 992                 FindMembers     = 0,
 993                 TcFindMembers   = 1,
 994                 MemberLookup    = 2,
 995                 CachedLookup    = 3,
 996                 CacheInit       = 4,
 997                 MiscTimer       = 5,
 998                 CountTimers     = 6
 999         }
1000
1001         public enum CounterType {
1002                 FindMembers     = 0,
1003                 MemberCache     = 1,
1004                 MiscCounter     = 2,
1005                 CountCounters   = 3
1006         }
1007
1008         public class Timer
1009         {
1010                 static DateTime[] timer_start;
1011                 static TimeSpan[] timers;
1012                 static long[] timer_counters;
1013                 static long[] counters;
1014
1015                 static Timer ()
1016                 {
1017                         timer_start = new DateTime [(int) TimerType.CountTimers];
1018                         timers = new TimeSpan [(int) TimerType.CountTimers];
1019                         timer_counters = new long [(int) TimerType.CountTimers];
1020                         counters = new long [(int) CounterType.CountCounters];
1021
1022                         for (int i = 0; i < (int) TimerType.CountTimers; i++) {
1023                                 timer_start [i] = DateTime.Now;
1024                                 timers [i] = TimeSpan.Zero;
1025                         }
1026                 }
1027
1028                 [Conditional("TIMER")]
1029                 static public void IncrementCounter (CounterType which)
1030                 {
1031                         ++counters [(int) which];
1032                 }
1033
1034                 [Conditional("TIMER")]
1035                 static public void StartTimer (TimerType which)
1036                 {
1037                         timer_start [(int) which] = DateTime.Now;
1038                 }
1039
1040                 [Conditional("TIMER")]
1041                 static public void StopTimer (TimerType which)
1042                 {
1043                         timers [(int) which] += DateTime.Now - timer_start [(int) which];
1044                         ++timer_counters [(int) which];
1045                 }
1046
1047                 [Conditional("TIMER")]
1048                 static public void ShowTimers ()
1049                 {
1050                         ShowTimer (TimerType.FindMembers, "- FindMembers timer");
1051                         ShowTimer (TimerType.TcFindMembers, "- TypeContainer.FindMembers timer");
1052                         ShowTimer (TimerType.MemberLookup, "- MemberLookup timer");
1053                         ShowTimer (TimerType.CachedLookup, "- CachedLookup timer");
1054                         ShowTimer (TimerType.CacheInit, "- Cache init");
1055                         ShowTimer (TimerType.MiscTimer, "- Misc timer");
1056
1057                         ShowCounter (CounterType.FindMembers, "- Find members");
1058                         ShowCounter (CounterType.MemberCache, "- Member cache");
1059                         ShowCounter (CounterType.MiscCounter, "- Misc counter");
1060                 }
1061
1062                 static public void ShowCounter (CounterType which, string msg)
1063                 {
1064                         Console.WriteLine ("{0} {1}", counters [(int) which], msg);
1065                 }
1066
1067                 static public void ShowTimer (TimerType which, string msg)
1068                 {
1069                         Console.WriteLine (
1070                                 "[{0:00}:{1:000}] {2} (used {3} times)",
1071                                 (int) timers [(int) which].TotalSeconds,
1072                                 timers [(int) which].Milliseconds, msg,
1073                                 timer_counters [(int) which]);
1074                 }
1075         }
1076
1077         public class InternalErrorException : Exception {
1078                 public InternalErrorException (MemberCore mc, Exception e)
1079                         : base (mc.Location + " " + mc.GetSignatureForError (), e)
1080                 {
1081                 }
1082
1083                 public InternalErrorException ()
1084                         : base ("Internal error")
1085                 {
1086                 }
1087
1088                 public InternalErrorException (string message)
1089                         : base (message)
1090                 {
1091                 }
1092
1093                 public InternalErrorException (string message, params object[] args)
1094                         : base (String.Format (message, args))
1095                 { }
1096
1097                 public InternalErrorException (Exception e, Location loc)
1098                         : base (loc.ToString (), e)
1099                 {
1100                 }
1101         }
1102
1103         /// <summary>
1104         /// Handles #pragma warning
1105         /// </summary>
1106         public class WarningRegions {
1107
1108                 abstract class PragmaCmd
1109                 {
1110                         public int Line;
1111
1112                         protected PragmaCmd (int line)
1113                         {
1114                                 Line = line;
1115                         }
1116
1117                         public abstract bool IsEnabled (int code, bool previous);
1118                 }
1119
1120                 class Disable : PragmaCmd
1121                 {
1122                         int code;
1123                         public Disable (int line, int code)
1124                                 : base (line)
1125                         {
1126                                 this.code = code;
1127                         }
1128
1129                         public override bool IsEnabled (int code, bool previous)
1130                         {
1131                                 return this.code == code ? false : previous;
1132                         }
1133                 }
1134
1135                 class DisableAll : PragmaCmd
1136                 {
1137                         public DisableAll (int line)
1138                                 : base (line) {}
1139
1140                         public override bool IsEnabled(int code, bool previous)
1141                         {
1142                                 return false;
1143                         }
1144                 }
1145
1146                 class Enable : PragmaCmd
1147                 {
1148                         int code;
1149                         public Enable (int line, int code)
1150                                 : base (line)
1151                         {
1152                                 this.code = code;
1153                         }
1154
1155                         public override bool IsEnabled(int code, bool previous)
1156                         {
1157                                 return this.code == code ? true : previous;
1158                         }
1159                 }
1160
1161                 class EnableAll : PragmaCmd
1162                 {
1163                         public EnableAll (int line)
1164                                 : base (line) {}
1165
1166                         public override bool IsEnabled(int code, bool previous)
1167                         {
1168                                 return true;
1169                         }
1170                 }
1171
1172
1173                 List<PragmaCmd> regions = new List<PragmaCmd> ();
1174
1175                 public void WarningDisable (int line)
1176                 {
1177                         regions.Add (new DisableAll (line));
1178                 }
1179
1180                 public void WarningDisable (Location location, int code, Report Report)
1181                 {
1182                         if (Report.CheckWarningCode (code, location))
1183                                 regions.Add (new Disable (location.Row, code));
1184                 }
1185
1186                 public void WarningEnable (int line)
1187                 {
1188                         regions.Add (new EnableAll (line));
1189                 }
1190
1191                 public void WarningEnable (Location location, int code, Report Report)
1192                 {
1193                         if (Report.CheckWarningCode (code, location))
1194                                 regions.Add (new Enable (location.Row, code));
1195                 }
1196
1197                 public bool IsWarningEnabled (int code, int src_line)
1198                 {
1199                         bool result = true;
1200                         foreach (PragmaCmd pragma in regions) {
1201                                 if (src_line < pragma.Line)
1202                                         break;
1203
1204                                 result = pragma.IsEnabled (code, result);
1205                         }
1206                         return result;
1207                 }
1208         }
1209 }