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;
  14 using System.Collections.Specialized;
  15 using System.Diagnostics;
  16 using System.Reflection;
  17 using System.Reflection.Emit;
  18
  19 namespace Mono.CSharp {
  20
  21         //
  22         // Errors and warnings manager
  23         //
  24         public class Report {
  25                 /// <summary>
  26                 ///   Whether errors should be throw an exception
  27                 /// </summary>
  28                 public bool Fatal;
  29
  30                 /// <summary>
  31                 ///   Whether warnings should be considered errors
  32                 /// </summary>
  33                 public bool WarningsAreErrors;
  34                 ArrayList warnings_as_error;
  35                 ArrayList warnings_only;
  36
  37                 public static int DebugFlags = 0;
  38
  39                 //
  40                 // Keeps track of the warnings that we are ignoring
  41                 //
  42                 public Hashtable warning_ignore_table;
  43
  44                 Hashtable warning_regions_table;
  45
  46                 int warning_level;
  47
  48                 ReportPrinter printer;
  49
  50                 int reporting_disabled;
  51
  52                 /// <summary>
  53                 /// List of symbols related to reported error/warning. You have to fill it before error/warning is reported.
  54                 /// </summary>
  55                 ArrayList extra_information = new ArrayList ();
  56
  57                 //
  58                 // IF YOU ADD A NEW WARNING YOU HAVE TO ADD ITS ID HERE
  59                 //
  60                 public static readonly int[] AllWarnings = new int[] {
  61                         28, 67, 78,
  62                         105, 108, 109, 114, 162, 164, 168, 169, 183, 184, 197,
  63                         219, 251, 252, 253, 278, 282,
  64                         402, 414, 419, 420, 429, 436, 440, 458, 464, 465, 467, 469, 472,
  65                         612, 618, 626, 628, 642, 649, 652, 658, 659, 660, 661, 665, 672, 675, 693,
  66                         809,
  67                         1030, 1058, 1066,
  68                         1522, 1570, 1571, 1572, 1573, 1574, 1580, 1581, 1584, 1587, 1589, 1590, 1591, 1592,
  69                         1616, 1633, 1634, 1635, 1685, 1690, 1691, 1692,
  70                         1700, 1717, 1718, 1720,
  71                         1901,
  72                         2002, 2023, 2029,
  73                         3000, 3001, 3002, 3003, 3005, 3006, 3007, 3008, 3009,
  74                         3010, 3011, 3012, 3013, 3014, 3015, 3016, 3017, 3018, 3019,
  75                         3021, 3022, 3023, 3024, 3026, 3027
  76                 };
  77
  78                 static Report ()
  79                 {
  80                         // Just to be sure that binary search is working
  81                         Array.Sort (AllWarnings);
  82                 }
  83
  84                 public Report (ReportPrinter printer)
  85                 {
  86                         if (printer == null)
  87                                 throw new ArgumentNullException ("printer");
  88
  89                         this.printer = printer;
  90                         warning_level = 4;
  91                 }
  92
  93                 public void DisableReporting ()
  94                 {
  95                         ++reporting_disabled;
  96                 }
  97
  98                 public void EnableReporting ()
  99                 {
 100                         --reporting_disabled;
 101                 }
 102
 103                 public void FeatureIsNotAvailable (Location loc, string feature)
 104                 {
 105                         string version;
 106                         switch (RootContext.Version) {
 107                         case LanguageVersion.ISO_1:
 108                                 version = "1.0";
 109                                 break;
 110                         case LanguageVersion.ISO_2:
 111                                 version = "2.0";
 112                                 break;
 113                         case LanguageVersion.V_3:
 114                                 version = "3.0";
 115                                 break;
 116                         default:
 117                                 throw new InternalErrorException ("Invalid feature version", RootContext.Version);
 118                         }
 119
 120                         Error (1644, loc,
 121                                 "Feature `{0}' cannot be used because it is not part of the C# {1} language specification",
 122                                       feature, version);
 123                 }
 124
 125                 public void FeatureIsNotSupported (Location loc, string feature)
 126                 {
 127                         Error (1644, loc,
 128                                 "Feature `{0}' is not supported in Mono mcs1 compiler. Consider using the `gmcs' compiler instead",
 129                                 feature);
 130                 }
 131
 132                 static bool IsValidWarning (int code)
 133                 {
 134                         return Array.BinarySearch (AllWarnings, code) >= 0;
 135                 }
 136
 137                 bool IsWarningEnabled (int code, int level, Location loc)
 138                 {
 139                         if (WarningLevel < level)
 140                                 return false;
 141
 142                         if (warning_ignore_table != null) {
 143                                 if (warning_ignore_table.Contains (code)) {
 144                                         return false;
 145                                 }
 146                         }
 147
 148                         if (warning_regions_table == null || loc.IsNull)
 149                                 return true;
 150
 151                         WarningRegions regions = (WarningRegions) warning_regions_table [loc.Name];
 152                         if (regions == null)
 153                                 return true;
 154
 155                         return regions.IsWarningEnabled (code, loc.Row);
 156                 }
 157
 158                 bool IsWarningAsError (int code)
 159                 {
 160                         bool is_error = WarningsAreErrors;
 161
 162                         // Check specific list
 163                         if (warnings_as_error != null)
 164                                 is_error |= warnings_as_error.Contains (code);
 165
 166                         // Ignore excluded warnings
 167                         if (warnings_only != null && warnings_only.Contains (code))
 168                                 is_error = false;
 169
 170                         return is_error;
 171                 }
 172
 173                 public void RuntimeMissingSupport (Location loc, string feature)
 174                 {
 175                         Error (-88, loc, "Your .NET Runtime does not support `{0}'. Please use the latest Mono runtime instead.", feature);
 176                 }
 177
 178                 /// <summary>
 179                 /// In most error cases is very useful to have information about symbol that caused the error.
 180                 /// Call this method before you call Report.Error when it makes sense.
 181                 /// </summary>
 182                 public void SymbolRelatedToPreviousError (Location loc, string symbol)
 183                 {
 184                         SymbolRelatedToPreviousError (loc.ToString (), symbol);
 185                 }
 186
 187                 public void SymbolRelatedToPreviousError (MemberInfo mi)
 188                 {
 189                         if (reporting_disabled > 0 || !printer.HasRelatedSymbolSupport)
 190                                 return;
 191
 192                         Type dt = TypeManager.DropGenericTypeArguments (mi.DeclaringType);
 193                         if (TypeManager.IsDelegateType (dt)) {
 194                                 SymbolRelatedToPreviousError (dt);
 195                                 return;
 196                         }
 197
 198                         DeclSpace temp_ds = TypeManager.LookupDeclSpace (dt);
 199                         if (temp_ds == null) {
 200                                 SymbolRelatedToPreviousError (dt.Assembly.Location, TypeManager.GetFullNameSignature (mi));
 201                         } else {
 202                                 MethodBase mb = mi as MethodBase;
 203                                 if (mb != null) {
 204                                         mb = TypeManager.DropGenericMethodArguments (mb);
 205                                         IMethodData md = TypeManager.GetMethod (mb);
 206                                         if (md != null)
 207                                                 SymbolRelatedToPreviousError (md.Location, md.GetSignatureForError ());
 208
 209                                         return;
 210                                 }
 211
 212                                 // FIXME: Completely wrong, it has to use FindMembers
 213                                 MemberCore mc = temp_ds.GetDefinition (mi.Name);
 214                                 if (mc != null)
 215                                         SymbolRelatedToPreviousError (mc);
 216                         }
 217                 }
 218
 219                 public void SymbolRelatedToPreviousError (MemberCore mc)
 220                 {
 221                         SymbolRelatedToPreviousError (mc.Location, mc.GetSignatureForError ());
 222                 }
 223
 224                 public void SymbolRelatedToPreviousError (Type type)
 225                 {
 226                         if (reporting_disabled > 0 || !printer.HasRelatedSymbolSupport)
 227                                 return;
 228
 229                         type = TypeManager.DropGenericTypeArguments (type);
 230
 231                         if (TypeManager.IsGenericParameter (type)) {
 232                                 TypeParameter tp = TypeManager.LookupTypeParameter (type);
 233                                 if (tp != null) {
 234                                         SymbolRelatedToPreviousError (tp.Location, "");
 235                                         return;
 236                                 }
 237                         }
 238
 239                         if (type is TypeBuilder) {
 240                                 DeclSpace temp_ds = TypeManager.LookupDeclSpace (type);
 241                                 SymbolRelatedToPreviousError (temp_ds.Location, TypeManager.CSharpName (type));
 242                         } else if (TypeManager.HasElementType (type)) {
 243                                 SymbolRelatedToPreviousError (TypeManager.GetElementType (type));
 244                         } else {
 245                                 SymbolRelatedToPreviousError (type.Assembly.Location, TypeManager.CSharpName (type));
 246                         }
 247                 }
 248
 249                 void SymbolRelatedToPreviousError (string loc, string symbol)
 250                 {
 251                         string msg = String.Format ("{0} (Location of the symbol related to previous ", loc);
 252                         if (extra_information.Contains (msg))
 253                                 return;
 254
 255                         extra_information.Add (msg);
 256                 }
 257
 258                 public void AddWarningAsError (string warningId)
 259                 {
 260                         int id;
 261                         try {
 262                                 id = int.Parse (warningId);
 263                         } catch {
 264                                 id = -1;
 265                         }
 266
 267                         if (!CheckWarningCode (id, warningId, Location.Null))
 268                                 return;
 269
 270                         if (warnings_as_error == null)
 271                                 warnings_as_error = new ArrayList ();
 272
 273                         warnings_as_error.Add (id);
 274                 }
 275
 276                 public void RemoveWarningAsError (string warningId)
 277                 {
 278                         int id;
 279                         try {
 280                                 id = int.Parse (warningId);
 281                         } catch {
 282                                 id = -1;
 283                         }
 284
 285                         if (!CheckWarningCode (id, warningId, Location.Null))
 286                                 return;
 287
 288                         if (warnings_only == null)
 289                                 warnings_only = new ArrayList ();
 290
 291                         warnings_only.Add (id);
 292                 }
 293
 294                 public bool CheckWarningCode (int code, Location loc)
 295                 {
 296                         return CheckWarningCode (code, code.ToString (), loc);
 297                 }
 298
 299                 public bool CheckWarningCode (int code, string scode, Location loc)
 300                 {
 301                         if (IsValidWarning (code))
 302                                 return true;
 303
 304                         Warning (1691, 1, loc, "`{0}' is not a valid warning number", scode);
 305                         return false;
 306                 }
 307
 308                 public void ExtraInformation (Location loc, string msg)
 309                 {
 310                         extra_information.Add (String.Format ("{0} {1}", loc, msg));
 311                 }
 312
 313                 public WarningRegions RegisterWarningRegion (Location location)
 314                 {
 315                         if (warning_regions_table == null)
 316                                 warning_regions_table = new Hashtable ();
 317
 318                         WarningRegions regions = (WarningRegions)warning_regions_table [location.Name];
 319                         if (regions == null) {
 320                                 regions = new WarningRegions ();
 321                                 warning_regions_table.Add (location.Name, regions);
 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                         if (Fatal)
 397                                 throw new Exception (msg.Text);
 398                 }
 399
 400                 public void Error (int code, Location loc, string format, string arg)
 401                 {
 402                         Error (code, loc, String.Format (format, arg));
 403                 }
 404
 405                 public void Error (int code, Location loc, string format, string arg1, string arg2)
 406                 {
 407                         Error (code, loc, String.Format (format, arg1, arg2));
 408                 }
 409
 410                 public void Error (int code, Location loc, string format, params object[] args)
 411                 {
 412                         Error (code, loc, String.Format (format, args));
 413                 }
 414
 415                 public void Error (int code, string error)
 416                 {
 417                         Error (code, Location.Null, error);
 418                 }
 419
 420                 public void Error (int code, string format, string arg)
 421                 {
 422                         Error (code, Location.Null, format, arg);
 423                 }
 424
 425                 public void Error (int code, string format, string arg1, string arg2)
 426                 {
 427                         Error (code, Location.Null, format, arg1, arg2);
 428                 }
 429
 430                 public void Error (int code, string format, params string[] args)
 431                 {
 432                         Error (code, Location.Null, String.Format (format, args));
 433                 }
 434
 435                 //
 436                 // Errors encountered so far
 437                 //
 438                 public int Errors {
 439                         get { return printer.ErrorsCount; }
 440                 }
 441
 442                 public ReportPrinter Printer {
 443                         get { return printer; }
 444                 }
 445
 446                 public void SetIgnoreWarning (int code)
 447                 {
 448                         if (warning_ignore_table == null)
 449                                 warning_ignore_table = new Hashtable ();
 450
 451                         warning_ignore_table [code] = true;
 452                 }
 453
 454                 public ReportPrinter SetPrinter (ReportPrinter printer)
 455                 {
 456                         ReportPrinter old = this.printer;
 457                         this.printer = printer;
 458                         return old;
 459                 }
 460
 461                 public int WarningLevel {
 462                         get {
 463                                 return warning_level;
 464                         }
 465                         set {
 466                                 warning_level = value;
 467                         }
 468                 }
 469
 470                 [Conditional ("MCS_DEBUG")]
 471                 static public void Debug (string message, params object[] args)
 472                 {
 473                         Debug (4, message, args);
 474                 }
 475
 476                 [Conditional ("MCS_DEBUG")]
 477                 static public void Debug (int category, string message, params object[] args)
 478                 {
 479                         if ((category & DebugFlags) == 0)
 480                                 return;
 481
 482                         StringBuilder sb = new StringBuilder (message);
 483
 484                         if ((args != null) && (args.Length > 0)) {
 485                                 sb.Append (": ");
 486
 487                                 bool first = true;
 488                                 foreach (object arg in args) {
 489                                         if (first)
 490                                                 first = false;
 491                                         else
 492                                                 sb.Append (", ");
 493                                         if (arg == null)
 494                                                 sb.Append ("null");
 495                                         else if (arg is ICollection)
 496                                                 sb.Append (PrintCollection ((ICollection) arg));
 497                                         else
 498                                                 sb.Append (arg);
 499                                 }
 500                         }
 501
 502                         Console.WriteLine (sb.ToString ());
 503                 }
 504
 505                 static public string PrintCollection (ICollection collection)
 506                 {
 507                         StringBuilder sb = new StringBuilder ();
 508
 509                         sb.Append (collection.GetType ());
 510                         sb.Append ("(");
 511
 512                         bool first = true;
 513                         foreach (object o in collection) {
 514                                 if (first)
 515                                         first = false;
 516                                 else
 517                                         sb.Append (", ");
 518                                 sb.Append (o);
 519                         }
 520
 521                         sb.Append (")");
 522                         return sb.ToString ();
 523                 }
 524         }
 525
 526         public abstract class AbstractMessage
 527         {
 528                 readonly string[] extra_info;
 529                 protected readonly int code;
 530                 protected readonly Location location;
 531                 readonly string message;
 532
 533                 protected AbstractMessage (int code, Location loc, string msg, ArrayList extraInfo)
 534                 {
 535                         this.code = code;
 536                         if (code < 0)
 537                                 this.code = 8000 - code;
 538
 539                         this.location = loc;
 540                         this.message = msg;
 541                         if (extraInfo.Count != 0) {
 542                                 this.extra_info = (string[])extraInfo.ToArray (typeof (string));
 543                         }
 544                 }
 545
 546                 protected AbstractMessage (AbstractMessage aMsg)
 547                 {
 548                         this.code = aMsg.code;
 549                         this.location = aMsg.location;
 550                         this.message = aMsg.message;
 551                         this.extra_info = aMsg.extra_info;
 552                 }
 553
 554                 public int Code {
 555                         get { return code; }
 556                 }
 557
 558                 public override bool Equals (object obj)
 559                 {
 560                         AbstractMessage msg = obj as AbstractMessage;
 561                         if (msg == null)
 562                                 return false;
 563
 564                         return code == msg.code && location.Equals (msg.location) && message == msg.message;
 565                 }
 566
 567                 public override int GetHashCode ()
 568                 {
 569                         return code.GetHashCode ();
 570                 }
 571
 572                 public abstract bool IsWarning { get; }
 573
 574                 public Location Location {
 575                         get { return location; }
 576                 }
 577
 578                 public abstract string MessageType { get; }
 579
 580                 public string[] RelatedSymbols {
 581                         get { return extra_info; }
 582                 }
 583
 584                 public string Text {
 585                         get { return message; }
 586                 }
 587         }
 588
 589         sealed class WarningMessage : AbstractMessage
 590         {
 591                 public WarningMessage (int code, Location loc, string message, ArrayList extra_info)
 592                         : base (code, loc, message, extra_info)
 593                 {
 594                 }
 595
 596                 public override bool IsWarning {
 597                         get { return true; }
 598                 }
 599
 600                 public override string MessageType {
 601                         get {
 602                                 return "warning";
 603                         }
 604                 }
 605         }
 606
 607         sealed class ErrorMessage : AbstractMessage
 608         {
 609                 public ErrorMessage (int code, Location loc, string message, ArrayList extraInfo)
 610                         : base (code, loc, message, extraInfo)
 611                 {
 612                 }
 613
 614                 public ErrorMessage (AbstractMessage aMsg)
 615                         : base (aMsg)
 616                 {
 617                 }
 618
 619                 public override bool IsWarning {
 620                         get { return false; }
 621                 }
 622
 623                 public override string MessageType {
 624                         get {
 625                                 return "error";
 626                         }
 627                 }
 628         }
 629
 630         //
 631         // Generic base for any message writer
 632         //
 633         public abstract class ReportPrinter
 634         {
 635                 /// <summary>
 636                 ///   Whether to dump a stack trace on errors.
 637                 /// </summary>
 638                 public bool Stacktrace;
 639
 640                 int warnings, errors;
 641
 642                 public int WarningsCount {
 643                         get { return warnings; }
 644                 }
 645
 646                 public int ErrorsCount {
 647                         get { return errors; }
 648                 }
 649
 650                 protected virtual string FormatText (string txt)
 651                 {
 652                         return txt;
 653                 }
 654
 655                 //
 656                 // When (symbols related to previous ...) can be used
 657                 //
 658                 public virtual bool HasRelatedSymbolSupport {
 659                         get { return true; }
 660                 }
 661
 662                 public virtual void Print (AbstractMessage msg)
 663                 {
 664                         if (msg.IsWarning)
 665                                 ++warnings;
 666                         else
 667                                 ++errors;
 668                 }
 669
 670                 protected void Print (AbstractMessage msg, TextWriter output)
 671                 {
 672                         StringBuilder txt = new StringBuilder ();
 673                         if (!msg.Location.IsNull) {
 674                                 txt.Append (msg.Location.ToString ());
 675                                 txt.Append (" ");
 676                         }
 677
 678                         txt.AppendFormat ("{0} CS{1:0000}: {2}", msg.MessageType, msg.Code, msg.Text);
 679
 680                         if (!msg.IsWarning)
 681                                 output.WriteLine (FormatText (txt.ToString ()));
 682                         else
 683                                 output.WriteLine (txt.ToString ());
 684
 685                         if (msg.RelatedSymbols != null) {
 686                                 foreach (string s in msg.RelatedSymbols)
 687                                         output.WriteLine (s + msg.MessageType + ")");
 688                         }
 689                 }
 690         }
 691
 692         //
 693         // Default message recorder, it uses two types of message groups.
 694         // Common messages: messages reported in all sessions.
 695         // Merged messages: union of all messages in all sessions.
 696         //
 697         // Used by the Lambda expressions to compile the code with various
 698         // parameter values, or by attribute resolver
 699         //
 700         class SessionReportPrinter : ReportPrinter
 701         {
 702                 ArrayList session_messages;
 703                 //
 704                 // A collection of exactly same messages reported in all sessions
 705                 //
 706                 ArrayList common_messages;
 707
 708                 //
 709                 // A collection of unique messages reported in all sessions
 710                 //
 711                 ArrayList merged_messages;
 712
 713                 public override void Print (AbstractMessage msg)
 714                 {
 715                         //
 716                         // This line is useful when debugging recorded messages
 717                         //
 718                         // Console.WriteLine ("RECORDING: {0} {1} {2}", code, location, message);
 719
 720                         if (session_messages == null)
 721                                 session_messages = new ArrayList ();
 722
 723                         session_messages.Add (msg);
 724
 725                         base.Print (msg);
 726                 }
 727
 728                 public void EndSession ()
 729                 {
 730                         if (session_messages == null)
 731                                 return;
 732
 733                         //
 734                         // Handles the first session
 735                         //
 736                         if (common_messages == null) {
 737                                 common_messages = new ArrayList (session_messages);
 738                                 merged_messages = session_messages;
 739                                 session_messages = null;
 740                                 return;
 741                         }
 742
 743                         //
 744                         // Store common messages if any
 745                         //
 746                         for (int i = 0; i < common_messages.Count; ++i) {
 747                                 AbstractMessage cmsg = (AbstractMessage) common_messages[i];
 748                                 bool common_msg_found = false;
 749                                 foreach (AbstractMessage msg in session_messages) {
 750                                         if (cmsg.Equals (msg)) {
 751                                                 common_msg_found = true;
 752                                                 break;
 753                                         }
 754                                 }
 755
 756                                 if (!common_msg_found)
 757                                         common_messages.RemoveAt (i);
 758                         }
 759
 760                         //
 761                         // Merge session and previous messages
 762                         //
 763                         for (int i = 0; i < session_messages.Count; ++i) {
 764                                 AbstractMessage msg = (AbstractMessage) session_messages[i];
 765                                 bool msg_found = false;
 766                                 for (int ii = 0; ii < merged_messages.Count; ++ii) {
 767                                         if (msg.Equals (merged_messages[ii])) {
 768                                                 msg_found = true;
 769                                                 break;
 770                                         }
 771                                 }
 772
 773                                 if (!msg_found)
 774                                         merged_messages.Add (msg);
 775                         }
 776                 }
 777
 778                 public bool IsEmpty {
 779                         get {
 780                                 return merged_messages == null && common_messages == null;
 781                         }
 782                 }
 783
 784                 //
 785                 // Prints collected messages, common messages have a priority
 786                 //
 787                 public bool Merge (ReportPrinter dest)
 788                 {
 789                         ArrayList messages_to_print = merged_messages;
 790                         if (common_messages != null && common_messages.Count > 0) {
 791                                 messages_to_print = common_messages;
 792                         }
 793
 794                         if (messages_to_print == null)
 795                                 return false;
 796
 797                         foreach (AbstractMessage msg in messages_to_print)
 798                                 dest.Print (msg);
 799
 800                         return true;
 801                 }
 802         }
 803
 804         class StreamReportPrinter : ReportPrinter
 805         {
 806                 readonly TextWriter writer;
 807
 808                 public StreamReportPrinter (TextWriter writer)
 809                 {
 810                         this.writer = writer;
 811                 }
 812
 813                 public override void Print (AbstractMessage msg)
 814                 {
 815                         Print (msg, writer);
 816                         base.Print (msg);
 817                 }
 818         }
 819
 820         class ConsoleReportPrinter : StreamReportPrinter
 821         {
 822                 static readonly string prefix, postfix;
 823
 824                 static ConsoleReportPrinter ()
 825                 {
 826                         string term = Environment.GetEnvironmentVariable ("TERM");
 827                         bool xterm_colors = false;
 828
 829                         switch (term){
 830                         case "xterm":
 831                         case "rxvt":
 832                         case "rxvt-unicode":
 833                                 if (Environment.GetEnvironmentVariable ("COLORTERM") != null){
 834                                         xterm_colors = true;
 835                                 }
 836                                 break;
 837
 838                         case "xterm-color":
 839                                 xterm_colors = true;
 840                                 break;
 841                         }
 842                         if (!xterm_colors)
 843                                 return;
 844
 845                         if (!(UnixUtils.isatty (1) && UnixUtils.isatty (2)))
 846                                 return;
 847
 848                         string config = Environment.GetEnvironmentVariable ("MCS_COLORS");
 849                         if (config == null){
 850                                 config = "errors=red";
 851                                 //config = "brightwhite,red";
 852                         }
 853
 854                         if (config == "disable")
 855                                 return;
 856
 857                         if (!config.StartsWith ("errors="))
 858                                 return;
 859
 860                         config = config.Substring (7);
 861
 862                         int p = config.IndexOf (",");
 863                         if (p == -1)
 864                                 prefix = GetForeground (config);
 865                         else
 866                                 prefix = GetBackground (config.Substring (p+1)) + GetForeground (config.Substring (0, p));
 867                         postfix = "\x001b[0m";
 868                 }
 869
 870                 public ConsoleReportPrinter ()
 871                         : base (Console.Error)
 872                 {
 873                 }
 874
 875                 public ConsoleReportPrinter (TextWriter writer)
 876                         : base (writer)
 877                 {
 878                 }
 879
 880                 static int NameToCode (string s)
 881                 {
 882                         switch (s) {
 883                         case "black":
 884                                 return 0;
 885                         case "red":
 886                                 return 1;
 887                         case "green":
 888                                 return 2;
 889                         case "yellow":
 890                                 return 3;
 891                         case "blue":
 892                                 return 4;
 893                         case "magenta":
 894                                 return 5;
 895                         case "cyan":
 896                                 return 6;
 897                         case "grey":
 898                         case "white":
 899                                 return 7;
 900                         }
 901                         return 7;
 902                 }
 903
 904                 //
 905                 // maps a color name to its xterm color code
 906                 //
 907                 static string GetForeground (string s)
 908                 {
 909                         string highcode;
 910
 911                         if (s.StartsWith ("bright")) {
 912                                 highcode = "1;";
 913                                 s = s.Substring (6);
 914                         } else
 915                                 highcode = "";
 916
 917                         return "\x001b[" + highcode + (30 + NameToCode (s)).ToString () + "m";
 918                 }
 919
 920                 static string GetBackground (string s)
 921                 {
 922                         return "\x001b[" + (40 + NameToCode (s)).ToString () + "m";
 923                 }
 924
 925                 protected override string FormatText (string txt)
 926                 {
 927                         if (prefix != null)
 928                                 return prefix + txt + postfix;
 929
 930                         return txt;
 931                 }
 932
 933                 static string FriendlyStackTrace (StackTrace t)
 934                 {
 935                         StringBuilder sb = new StringBuilder ();
 936
 937                         bool foundUserCode = false;
 938
 939                         for (int i = 0; i < t.FrameCount; i++) {
 940                                 StackFrame f = t.GetFrame (i);
 941                                 MethodBase mb = f.GetMethod ();
 942
 943                                 if (!foundUserCode && mb.ReflectedType == typeof (Report))
 944                                         continue;
 945
 946                                 foundUserCode = true;
 947
 948                                 sb.Append ("\tin ");
 949
 950                                 if (f.GetFileLineNumber () > 0)
 951                                         sb.AppendFormat ("(at {0}:{1}) ", f.GetFileName (), f.GetFileLineNumber ());
 952
 953                                 sb.AppendFormat ("{0}.{1} (", mb.ReflectedType.Name, mb.Name);
 954
 955                                 bool first = true;
 956                                 foreach (ParameterInfo pi in mb.GetParameters ()) {
 957                                         if (!first)
 958                                                 sb.Append (", ");
 959                                         first = false;
 960
 961                                         sb.Append (TypeManager.CSharpName (pi.ParameterType));
 962                                 }
 963                                 sb.Append (")\n");
 964                         }
 965
 966                         return sb.ToString ();
 967                 }
 968
 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
 977                 public static string FriendlyStackTrace (Exception e)
 978                 {
 979                         return FriendlyStackTrace (new StackTrace (e, true));
 980                 }
 981
 982                 public static void StackTrace ()
 983                 {
 984                         Console.WriteLine (FriendlyStackTrace (new StackTrace (true)));
 985                 }
 986         }
 987
 988         public enum TimerType {
 989                 FindMembers     = 0,
 990                 TcFindMembers   = 1,
 991                 MemberLookup    = 2,
 992                 CachedLookup    = 3,
 993                 CacheInit       = 4,
 994                 MiscTimer       = 5,
 995                 CountTimers     = 6
 996         }
 997
 998         public enum CounterType {
 999                 FindMembers     = 0,
1000                 MemberCache     = 1,
1001                 MiscCounter     = 2,
1002                 CountCounters   = 3
1003         }
1004
1005         public class Timer
1006         {
1007                 static DateTime[] timer_start;
1008                 static TimeSpan[] timers;
1009                 static long[] timer_counters;
1010                 static long[] counters;
1011
1012                 static Timer ()
1013                 {
1014                         timer_start = new DateTime [(int) TimerType.CountTimers];
1015                         timers = new TimeSpan [(int) TimerType.CountTimers];
1016                         timer_counters = new long [(int) TimerType.CountTimers];
1017                         counters = new long [(int) CounterType.CountCounters];
1018
1019                         for (int i = 0; i < (int) TimerType.CountTimers; i++) {
1020                                 timer_start [i] = DateTime.Now;
1021                                 timers [i] = TimeSpan.Zero;
1022                         }
1023                 }
1024
1025                 [Conditional("TIMER")]
1026                 static public void IncrementCounter (CounterType which)
1027                 {
1028                         ++counters [(int) which];
1029                 }
1030
1031                 [Conditional("TIMER")]
1032                 static public void StartTimer (TimerType which)
1033                 {
1034                         timer_start [(int) which] = DateTime.Now;
1035                 }
1036
1037                 [Conditional("TIMER")]
1038                 static public void StopTimer (TimerType which)
1039                 {
1040                         timers [(int) which] += DateTime.Now - timer_start [(int) which];
1041                         ++timer_counters [(int) which];
1042                 }
1043
1044                 [Conditional("TIMER")]
1045                 static public void ShowTimers ()
1046                 {
1047                         ShowTimer (TimerType.FindMembers, "- FindMembers timer");
1048                         ShowTimer (TimerType.TcFindMembers, "- TypeContainer.FindMembers timer");
1049                         ShowTimer (TimerType.MemberLookup, "- MemberLookup timer");
1050                         ShowTimer (TimerType.CachedLookup, "- CachedLookup timer");
1051                         ShowTimer (TimerType.CacheInit, "- Cache init");
1052                         ShowTimer (TimerType.MiscTimer, "- Misc timer");
1053
1054                         ShowCounter (CounterType.FindMembers, "- Find members");
1055                         ShowCounter (CounterType.MemberCache, "- Member cache");
1056                         ShowCounter (CounterType.MiscCounter, "- Misc counter");
1057                 }
1058
1059                 static public void ShowCounter (CounterType which, string msg)
1060                 {
1061                         Console.WriteLine ("{0} {1}", counters [(int) which], msg);
1062                 }
1063
1064                 static public void ShowTimer (TimerType which, string msg)
1065                 {
1066                         Console.WriteLine (
1067                                 "[{0:00}:{1:000}] {2} (used {3} times)",
1068                                 (int) timers [(int) which].TotalSeconds,
1069                                 timers [(int) which].Milliseconds, msg,
1070                                 timer_counters [(int) which]);
1071                 }
1072         }
1073
1074         public class InternalErrorException : Exception {
1075                 public InternalErrorException (MemberCore mc, Exception e)
1076                         : base (mc.Location + " " + mc.GetSignatureForError (), e)
1077                 {
1078                 }
1079
1080                 public InternalErrorException ()
1081                         : base ("Internal error")
1082                 {
1083                 }
1084
1085                 public InternalErrorException (string message)
1086                         : base (message)
1087                 {
1088                 }
1089
1090                 public InternalErrorException (string message, params object[] args)
1091                         : base (String.Format (message, args))
1092                 { }
1093
1094                 public InternalErrorException (Exception e, Location loc)
1095                         : base (loc.ToString (), e)
1096                 {
1097                 }
1098         }
1099
1100         /// <summary>
1101         /// Handles #pragma warning
1102         /// </summary>
1103         public class WarningRegions {
1104
1105                 abstract class PragmaCmd
1106                 {
1107                         public int Line;
1108
1109                         protected PragmaCmd (int line)
1110                         {
1111                                 Line = line;
1112                         }
1113
1114                         public abstract bool IsEnabled (int code, bool previous);
1115                 }
1116
1117                 class Disable : PragmaCmd
1118                 {
1119                         int code;
1120                         public Disable (int line, int code)
1121                                 : base (line)
1122                         {
1123                                 this.code = code;
1124                         }
1125
1126                         public override bool IsEnabled (int code, bool previous)
1127                         {
1128                                 return this.code == code ? false : previous;
1129                         }
1130                 }
1131
1132                 class DisableAll : PragmaCmd
1133                 {
1134                         public DisableAll (int line)
1135                                 : base (line) {}
1136
1137                         public override bool IsEnabled(int code, bool previous)
1138                         {
1139                                 return false;
1140                         }
1141                 }
1142
1143                 class Enable : PragmaCmd
1144                 {
1145                         int code;
1146                         public Enable (int line, int code)
1147                                 : base (line)
1148                         {
1149                                 this.code = code;
1150                         }
1151
1152                         public override bool IsEnabled(int code, bool previous)
1153                         {
1154                                 return this.code == code ? true : previous;
1155                         }
1156                 }
1157
1158                 class EnableAll : PragmaCmd
1159                 {
1160                         public EnableAll (int line)
1161                                 : base (line) {}
1162
1163                         public override bool IsEnabled(int code, bool previous)
1164                         {
1165                                 return true;
1166                         }
1167                 }
1168
1169
1170                 ArrayList regions = new ArrayList ();
1171
1172                 public void WarningDisable (int line)
1173                 {
1174                         regions.Add (new DisableAll (line));
1175                 }
1176
1177                 public void WarningDisable (Location location, int code, Report Report)
1178                 {
1179                         if (Report.CheckWarningCode (code, location))
1180                                 regions.Add (new Disable (location.Row, code));
1181                 }
1182
1183                 public void WarningEnable (int line)
1184                 {
1185                         regions.Add (new EnableAll (line));
1186                 }
1187
1188                 public void WarningEnable (Location location, int code, Report Report)
1189                 {
1190                         if (Report.CheckWarningCode (code, location))
1191                                 regions.Add (new Enable (location.Row, code));
1192                 }
1193
1194                 public bool IsWarningEnabled (int code, int src_line)
1195                 {
1196                         bool result = true;
1197                         foreach (PragmaCmd pragma in regions) {
1198                                 if (src_line < pragma.Line)
1199                                         break;
1200
1201                                 result = pragma.IsEnabled (code, result);
1202                         }
1203                         return result;
1204                 }
1205         }
1206 }