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