mcs/class/Mono.CompilerServices.SymbolWriter/MonoSymbolTable.cs

   1 //
   2 // Mono.CSharp.Debugger/MonoSymbolTable.cs
   3 //
   4 // Author:
   5 //   Martin Baulig (martin@ximian.com)
   6 //
   7 // (C) 2002 Ximian, Inc.  http://www.ximian.com
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32 using System.Security.Cryptography;
  33 using System.Collections.Generic;
  34 using System.Text;
  35 using System.IO;
  36
  37 //
  38 // Parts which are actually written into the symbol file are marked with
  39 //
  40 //         #region This is actually written to the symbol file
  41 //         #endregion
  42 //
  43 // Please do not modify these regions without previously talking to me.
  44 //
  45 // All changes to the file format must be synchronized in several places:
  46 //
  47 // a) The fields in these regions (and their order) must match the actual
  48 //    contents of the symbol file.
  49 //
  50 //    This helps people to understand the symbol file format without reading
  51 //    too much source code, ie. you look at the appropriate region and then
  52 //    you know what's actually in the file.
  53 //
  54 //    It is also required to help me enforce b).
  55 //
  56 // b) The regions must be kept in sync with the unmanaged code in
  57 //    mono/metadata/debug-mono-symfile.h
  58 //
  59 // When making changes to the file format, you must also increase two version
  60 // numbers:
  61 //
  62 // i)  OffsetTable.Version in this file.
  63 // ii) MONO_SYMBOL_FILE_VERSION in mono/metadata/debug-mono-symfile.h
  64 //
  65 // After doing so, recompile everything, including the debugger.  Symbol files
  66 // with different versions are incompatible to each other and the debugger and
  67 // the runtime enfore this, so you need to recompile all your assemblies after
  68 // changing the file format.
  69 //
  70
  71 namespace Mono.CompilerServices.SymbolWriter
  72 {
  73         public class OffsetTable
  74         {
  75                 public const int  MajorVersion = 50;
  76                 public const int  MinorVersion = 0;
  77                 public const long Magic        = 0x45e82623fd7fa614;
  78
  79                 #region This is actually written to the symbol file
  80                 public int TotalFileSize;
  81                 public int DataSectionOffset;
  82                 public int DataSectionSize;
  83                 public int CompileUnitCount;
  84                 public int CompileUnitTableOffset;
  85                 public int CompileUnitTableSize;
  86                 public int SourceCount;
  87                 public int SourceTableOffset;
  88                 public int SourceTableSize;
  89                 public int MethodCount;
  90                 public int MethodTableOffset;
  91                 public int MethodTableSize;
  92                 public int TypeCount;
  93                 public int AnonymousScopeCount;
  94                 public int AnonymousScopeTableOffset;
  95                 public int AnonymousScopeTableSize;
  96
  97                 [Flags]
  98                 public enum Flags
  99                 {
 100                         IsAspxSource            = 1,
 101                         WindowsFileNames        = 2
 102                 }
 103
 104                 public Flags FileFlags;
 105
 106                 public int LineNumberTable_LineBase = LineNumberTable.Default_LineBase;
 107                 public int LineNumberTable_LineRange = LineNumberTable.Default_LineRange;
 108                 public int LineNumberTable_OpcodeBase = LineNumberTable.Default_OpcodeBase;
 109                 #endregion
 110
 111                 internal OffsetTable ()
 112                 {
 113                         int platform = (int) Environment.OSVersion.Platform;
 114                         if ((platform != 4) && (platform != 128))
 115                                 FileFlags |= Flags.WindowsFileNames;
 116                 }
 117
 118                 internal OffsetTable (BinaryReader reader, int major_version, int minor_version)
 119                 {
 120                         TotalFileSize = reader.ReadInt32 ();
 121                         DataSectionOffset = reader.ReadInt32 ();
 122                         DataSectionSize = reader.ReadInt32 ();
 123                         CompileUnitCount = reader.ReadInt32 ();
 124                         CompileUnitTableOffset = reader.ReadInt32 ();
 125                         CompileUnitTableSize = reader.ReadInt32 ();
 126                         SourceCount = reader.ReadInt32 ();
 127                         SourceTableOffset = reader.ReadInt32 ();
 128                         SourceTableSize = reader.ReadInt32 ();
 129                         MethodCount = reader.ReadInt32 ();
 130                         MethodTableOffset = reader.ReadInt32 ();
 131                         MethodTableSize = reader.ReadInt32 ();
 132                         TypeCount = reader.ReadInt32 ();
 133
 134                         AnonymousScopeCount = reader.ReadInt32 ();
 135                         AnonymousScopeTableOffset = reader.ReadInt32 ();
 136                         AnonymousScopeTableSize = reader.ReadInt32 ();
 137
 138                         LineNumberTable_LineBase = reader.ReadInt32 ();
 139                         LineNumberTable_LineRange = reader.ReadInt32 ();
 140                         LineNumberTable_OpcodeBase = reader.ReadInt32 ();
 141
 142                         FileFlags = (Flags) reader.ReadInt32 ();
 143                 }
 144
 145                 internal void Write (BinaryWriter bw, int major_version, int minor_version)
 146                 {
 147                         bw.Write (TotalFileSize);
 148                         bw.Write (DataSectionOffset);
 149                         bw.Write (DataSectionSize);
 150                         bw.Write (CompileUnitCount);
 151                         bw.Write (CompileUnitTableOffset);
 152                         bw.Write (CompileUnitTableSize);
 153                         bw.Write (SourceCount);
 154                         bw.Write (SourceTableOffset);
 155                         bw.Write (SourceTableSize);
 156                         bw.Write (MethodCount);
 157                         bw.Write (MethodTableOffset);
 158                         bw.Write (MethodTableSize);
 159                         bw.Write (TypeCount);
 160
 161                         bw.Write (AnonymousScopeCount);
 162                         bw.Write (AnonymousScopeTableOffset);
 163                         bw.Write (AnonymousScopeTableSize);
 164
 165                         bw.Write (LineNumberTable_LineBase);
 166                         bw.Write (LineNumberTable_LineRange);
 167                         bw.Write (LineNumberTable_OpcodeBase);
 168
 169                         bw.Write ((int) FileFlags);
 170                 }
 171
 172                 public override string ToString ()
 173                 {
 174                         return String.Format (
 175                                 "OffsetTable [{0} - {1}:{2} - {3}:{4}:{5} - {6}:{7}:{8} - {9}]",
 176                                 TotalFileSize, DataSectionOffset, DataSectionSize, SourceCount,
 177                                 SourceTableOffset, SourceTableSize, MethodCount, MethodTableOffset,
 178                                 MethodTableSize, TypeCount);
 179                 }
 180         }
 181
 182         public class LineNumberEntry
 183         {
 184                 #region This is actually written to the symbol file
 185                 public readonly int Row;
 186                 public int Column;
 187                 public int EndRow, EndColumn;
 188                 public readonly int File;
 189                 public readonly int Offset;
 190                 public readonly bool IsHidden;  // Obsolete is never used
 191                 #endregion
 192
 193                 public sealed class LocationComparer : IComparer<LineNumberEntry>
 194                 {
 195                         public static readonly LocationComparer Default = new LocationComparer ();
 196
 197                         public int Compare (LineNumberEntry l1, LineNumberEntry l2)
 198                         {
 199                                 return l1.Row == l2.Row ?
 200                                         l1.Column.CompareTo (l2.Column) :
 201                                         l1.Row.CompareTo (l2.Row);
 202                         }
 203                 }
 204
 205                 public static readonly LineNumberEntry Null = new LineNumberEntry (0, 0, 0, 0);
 206
 207                 public LineNumberEntry (int file, int row, int column, int offset)
 208                         : this (file, row, column, offset, false)
 209                 {
 210                 }
 211
 212                 public LineNumberEntry (int file, int row, int offset)
 213                         : this (file, row, -1, offset, false)
 214                 {
 215                 }
 216
 217                 public LineNumberEntry (int file, int row, int column, int offset, bool is_hidden)
 218                 : this (file, row, column, -1, -1, offset, is_hidden)
 219                 {
 220                 }
 221
 222                 public LineNumberEntry (int file, int row, int column, int end_row, int end_column, int offset, bool is_hidden)
 223                 {
 224                         this.File = file;
 225                         this.Row = row;
 226                         this.Column = column;
 227                         this.EndRow = end_row;
 228                         this.EndColumn = end_column;
 229                         this.Offset = offset;
 230                         this.IsHidden = is_hidden;
 231                 }
 232
 233                 public override string ToString ()
 234                 {
 235                         return String.Format ("[Line {0}:{1,2}-{3,4}:{5}]", File, Row, Column, EndRow, EndColumn, Offset);
 236                 }
 237         }
 238
 239         public class CodeBlockEntry
 240         {
 241                 public int Index;
 242                 #region This is actually written to the symbol file
 243                 public int Parent;
 244                 public Type BlockType;
 245                 public int StartOffset;
 246                 public int EndOffset;
 247                 #endregion
 248
 249                 public enum Type {
 250                         Lexical                 = 1,
 251                         CompilerGenerated       = 2,
 252                         IteratorBody            = 3,
 253                         IteratorDispatcher      = 4
 254                 }
 255
 256                 public CodeBlockEntry (int index, int parent, Type type, int start_offset)
 257                 {
 258                         this.Index = index;
 259                         this.Parent = parent;
 260                         this.BlockType = type;
 261                         this.StartOffset = start_offset;
 262                 }
 263
 264                 internal CodeBlockEntry (int index, MyBinaryReader reader)
 265                 {
 266                         this.Index = index;
 267                         int type_flag = reader.ReadLeb128 ();
 268                         BlockType = (Type) (type_flag & 0x3f);
 269                         this.Parent = reader.ReadLeb128 ();
 270                         this.StartOffset = reader.ReadLeb128 ();
 271                         this.EndOffset = reader.ReadLeb128 ();
 272
 273                         /* Reserved for future extensions. */
 274                         if ((type_flag & 0x40) != 0) {
 275                                 int data_size = reader.ReadInt16 ();
 276                                 reader.BaseStream.Position += data_size;
 277                         }
 278                 }
 279
 280                 public void Close (int end_offset)
 281                 {
 282                         this.EndOffset = end_offset;
 283                 }
 284
 285                 internal void Write (MyBinaryWriter bw)
 286                 {
 287                         bw.WriteLeb128 ((int) BlockType);
 288                         bw.WriteLeb128 (Parent);
 289                         bw.WriteLeb128 (StartOffset);
 290                         bw.WriteLeb128 (EndOffset);
 291                 }
 292
 293                 public override string ToString ()
 294                 {
 295                         return String.Format ("[CodeBlock {0}:{1}:{2}:{3}:{4}]",
 296                                               Index, Parent, BlockType, StartOffset, EndOffset);
 297                 }
 298         }
 299
 300         public struct LocalVariableEntry
 301         {
 302                 #region This is actually written to the symbol file
 303                 public readonly int Index;
 304                 public readonly string Name;
 305                 public readonly int BlockIndex;
 306                 #endregion
 307
 308                 public LocalVariableEntry (int index, string name, int block)
 309                 {
 310                         this.Index = index;
 311                         this.Name = name;
 312                         this.BlockIndex = block;
 313                 }
 314
 315                 internal LocalVariableEntry (MonoSymbolFile file, MyBinaryReader reader)
 316                 {
 317                         Index = reader.ReadLeb128 ();
 318                         Name = reader.ReadString ();
 319                         BlockIndex = reader.ReadLeb128 ();
 320                 }
 321
 322                 internal void Write (MonoSymbolFile file, MyBinaryWriter bw)
 323                 {
 324                         bw.WriteLeb128 (Index);
 325                         bw.Write (Name);
 326                         bw.WriteLeb128 (BlockIndex);
 327                 }
 328
 329                 public override string ToString ()
 330                 {
 331                         return String.Format ("[LocalVariable {0}:{1}:{2}]",
 332                                               Name, Index, BlockIndex - 1);
 333                 }
 334         }
 335
 336         public struct CapturedVariable
 337         {
 338                 #region This is actually written to the symbol file
 339                 public readonly string Name;
 340                 public readonly string CapturedName;
 341                 public readonly CapturedKind Kind;
 342                 #endregion
 343
 344                 public enum CapturedKind : byte
 345                 {
 346                         Local,
 347                         Parameter,
 348                         This
 349                 }
 350
 351                 public CapturedVariable (string name, string captured_name,
 352                                          CapturedKind kind)
 353                 {
 354                         this.Name = name;
 355                         this.CapturedName = captured_name;
 356                         this.Kind = kind;
 357                 }
 358
 359                 internal CapturedVariable (MyBinaryReader reader)
 360                 {
 361                         Name = reader.ReadString ();
 362                         CapturedName = reader.ReadString ();
 363                         Kind = (CapturedKind) reader.ReadByte ();
 364                 }
 365
 366                 internal void Write (MyBinaryWriter bw)
 367                 {
 368                         bw.Write (Name);
 369                         bw.Write (CapturedName);
 370                         bw.Write ((byte) Kind);
 371                 }
 372
 373                 public override string ToString ()
 374                 {
 375                         return String.Format ("[CapturedVariable {0}:{1}:{2}]",
 376                                               Name, CapturedName, Kind);
 377                 }
 378         }
 379
 380         public struct CapturedScope
 381         {
 382                 #region This is actually written to the symbol file
 383                 public readonly int Scope;
 384                 public readonly string CapturedName;
 385                 #endregion
 386
 387                 public CapturedScope (int scope, string captured_name)
 388                 {
 389                         this.Scope = scope;
 390                         this.CapturedName = captured_name;
 391                 }
 392
 393                 internal CapturedScope (MyBinaryReader reader)
 394                 {
 395                         Scope = reader.ReadLeb128 ();
 396                         CapturedName = reader.ReadString ();
 397                 }
 398
 399                 internal void Write (MyBinaryWriter bw)
 400                 {
 401                         bw.WriteLeb128 (Scope);
 402                         bw.Write (CapturedName);
 403                 }
 404
 405                 public override string ToString ()
 406                 {
 407                         return String.Format ("[CapturedScope {0}:{1}]",
 408                                               Scope, CapturedName);
 409                 }
 410         }
 411
 412         public struct ScopeVariable
 413         {
 414                 #region This is actually written to the symbol file
 415                 public readonly int Scope;
 416                 public readonly int Index;
 417                 #endregion
 418
 419                 public ScopeVariable (int scope, int index)
 420                 {
 421                         this.Scope = scope;
 422                         this.Index = index;
 423                 }
 424
 425                 internal ScopeVariable (MyBinaryReader reader)
 426                 {
 427                         Scope = reader.ReadLeb128 ();
 428                         Index = reader.ReadLeb128 ();
 429                 }
 430
 431                 internal void Write (MyBinaryWriter bw)
 432                 {
 433                         bw.WriteLeb128 (Scope);
 434                         bw.WriteLeb128 (Index);
 435                 }
 436
 437                 public override string ToString ()
 438                 {
 439                         return String.Format ("[ScopeVariable {0}:{1}]", Scope, Index);
 440                 }
 441         }
 442
 443         public class AnonymousScopeEntry
 444         {
 445                 #region This is actually written to the symbol file
 446                 public readonly int ID;
 447                 #endregion
 448
 449                 List<CapturedVariable> captured_vars = new List<CapturedVariable> ();
 450                 List<CapturedScope> captured_scopes = new List<CapturedScope> ();
 451
 452                 public AnonymousScopeEntry (int id)
 453                 {
 454                         this.ID = id;
 455                 }
 456
 457                 internal AnonymousScopeEntry (MyBinaryReader reader)
 458                 {
 459                         ID = reader.ReadLeb128 ();
 460
 461                         int num_captured_vars = reader.ReadLeb128 ();
 462                         for (int i = 0; i < num_captured_vars; i++)
 463                                 captured_vars.Add (new CapturedVariable (reader));
 464
 465                         int num_captured_scopes = reader.ReadLeb128 ();
 466                         for (int i = 0; i < num_captured_scopes; i++)
 467                                 captured_scopes.Add (new CapturedScope (reader));
 468                 }
 469
 470                 internal void AddCapturedVariable (string name, string captured_name,
 471                                                    CapturedVariable.CapturedKind kind)
 472                 {
 473                         captured_vars.Add (new CapturedVariable (name, captured_name, kind));
 474                 }
 475
 476                 public CapturedVariable[] CapturedVariables {
 477                         get {
 478                                 CapturedVariable[] retval = new CapturedVariable [captured_vars.Count];
 479                                 captured_vars.CopyTo (retval, 0);
 480                                 return retval;
 481                         }
 482                 }
 483
 484                 internal void AddCapturedScope (int scope, string captured_name)
 485                 {
 486                         captured_scopes.Add (new CapturedScope (scope, captured_name));
 487                 }
 488
 489                 public CapturedScope[] CapturedScopes {
 490                         get {
 491                                 CapturedScope[] retval = new CapturedScope [captured_scopes.Count];
 492                                 captured_scopes.CopyTo (retval, 0);
 493                                 return retval;
 494                         }
 495                 }
 496
 497                 internal void Write (MyBinaryWriter bw)
 498                 {
 499                         bw.WriteLeb128 (ID);
 500
 501                         bw.WriteLeb128 (captured_vars.Count);
 502                         foreach (CapturedVariable cv in captured_vars)
 503                                 cv.Write (bw);
 504
 505                         bw.WriteLeb128 (captured_scopes.Count);
 506                         foreach (CapturedScope cs in captured_scopes)
 507                                 cs.Write (bw);
 508                 }
 509
 510                 public override string ToString ()
 511                 {
 512                         return String.Format ("[AnonymousScope {0}]", ID);
 513                 }
 514         }
 515
 516         public class CompileUnitEntry : ICompileUnit
 517         {
 518                 #region This is actually written to the symbol file
 519                 public readonly int Index;
 520                 int DataOffset;
 521                 #endregion
 522
 523                 MonoSymbolFile file;
 524                 SourceFileEntry source;
 525                 List<SourceFileEntry> include_files;
 526                 List<NamespaceEntry> namespaces;
 527
 528                 bool creating;
 529
 530                 public static int Size {
 531                         get { return 8; }
 532                 }
 533
 534                 CompileUnitEntry ICompileUnit.Entry {
 535                         get { return this; }
 536                 }
 537
 538                 public CompileUnitEntry (MonoSymbolFile file, SourceFileEntry source)
 539                 {
 540                         this.file = file;
 541                         this.source = source;
 542
 543                         this.Index = file.AddCompileUnit (this);
 544
 545                         creating = true;
 546                         namespaces = new List<NamespaceEntry> ();
 547                 }
 548
 549                 public void AddFile (SourceFileEntry file)
 550                 {
 551                         if (!creating)
 552                                 throw new InvalidOperationException ();
 553
 554                         if (include_files == null)
 555                                 include_files = new List<SourceFileEntry> ();
 556
 557                         include_files.Add (file);
 558                 }
 559
 560                 public SourceFileEntry SourceFile {
 561                         get {
 562                                 if (creating)
 563                                         return source;
 564
 565                                 ReadData ();
 566                                 return source;
 567                         }
 568                 }
 569
 570                 public int DefineNamespace (string name, string[] using_clauses, int parent)
 571                 {
 572                         if (!creating)
 573                                 throw new InvalidOperationException ();
 574
 575                         int index = file.GetNextNamespaceIndex ();
 576                         NamespaceEntry ns = new NamespaceEntry (name, index, using_clauses, parent);
 577                         namespaces.Add (ns);
 578                         return index;
 579                 }
 580
 581                 internal void WriteData (MyBinaryWriter bw)
 582                 {
 583                         DataOffset = (int) bw.BaseStream.Position;
 584                         bw.WriteLeb128 (source.Index);
 585
 586                         int count_includes = include_files != null ? include_files.Count : 0;
 587                         bw.WriteLeb128 (count_includes);
 588                         if (include_files != null) {
 589                                 foreach (SourceFileEntry entry in include_files)
 590                                         bw.WriteLeb128 (entry.Index);
 591                         }
 592
 593                         bw.WriteLeb128 (namespaces.Count);
 594                         foreach (NamespaceEntry ns in namespaces)
 595                                 ns.Write (file, bw);
 596                 }
 597
 598                 internal void Write (BinaryWriter bw)
 599                 {
 600                         bw.Write (Index);
 601                         bw.Write (DataOffset);
 602                 }
 603
 604                 internal CompileUnitEntry (MonoSymbolFile file, MyBinaryReader reader)
 605                 {
 606                         this.file = file;
 607
 608                         Index = reader.ReadInt32 ();
 609                         DataOffset = reader.ReadInt32 ();
 610                 }
 611
 612                 public void ReadAll ()
 613                 {
 614                         ReadData ();
 615                 }
 616
 617                 void ReadData ()
 618                 {
 619                         if (creating)
 620                                 throw new InvalidOperationException ();
 621
 622                         lock (file) {
 623                                 if (namespaces != null)
 624                                         return;
 625
 626                                 MyBinaryReader reader = file.BinaryReader;
 627                                 int old_pos = (int) reader.BaseStream.Position;
 628
 629                                 reader.BaseStream.Position = DataOffset;
 630
 631                                 int source_idx = reader.ReadLeb128 ();
 632                                 source = file.GetSourceFile (source_idx);
 633
 634                                 int count_includes = reader.ReadLeb128 ();
 635                                 if (count_includes > 0) {
 636                                         include_files = new List<SourceFileEntry> ();
 637                                         for (int i = 0; i < count_includes; i++)
 638                                                 include_files.Add (file.GetSourceFile (reader.ReadLeb128 ()));
 639                                 }
 640
 641                                 int count_ns = reader.ReadLeb128 ();
 642                                 namespaces = new List<NamespaceEntry> ();
 643                                 for (int i = 0; i < count_ns; i ++)
 644                                         namespaces.Add (new NamespaceEntry (file, reader));
 645
 646                                 reader.BaseStream.Position = old_pos;
 647                         }
 648                 }
 649
 650                 public NamespaceEntry[] Namespaces {
 651                         get {
 652                                 ReadData ();
 653                                 NamespaceEntry[] retval = new NamespaceEntry [namespaces.Count];
 654                                 namespaces.CopyTo (retval, 0);
 655                                 return retval;
 656                         }
 657                 }
 658
 659                 public SourceFileEntry[] IncludeFiles {
 660                         get {
 661                                 ReadData ();
 662                                 if (include_files == null)
 663                                         return new SourceFileEntry [0];
 664
 665                                 SourceFileEntry[] retval = new SourceFileEntry [include_files.Count];
 666                                 include_files.CopyTo (retval, 0);
 667                                 return retval;
 668                         }
 669                 }
 670         }
 671
 672         public class SourceFileEntry
 673         {
 674                 #region This is actually written to the symbol file
 675                 public readonly int Index;
 676                 int DataOffset;
 677                 #endregion
 678
 679                 MonoSymbolFile file;
 680                 string file_name;
 681                 byte[] guid;
 682                 byte[] hash;
 683                 bool creating;
 684                 bool auto_generated;
 685
 686                 public static int Size {
 687                         get { return 8; }
 688                 }
 689
 690                 public SourceFileEntry (MonoSymbolFile file, string file_name)
 691                 {
 692                         this.file = file;
 693                         this.file_name = file_name;
 694                         this.Index = file.AddSource (this);
 695
 696                         creating = true;
 697                 }
 698
 699                 public SourceFileEntry (MonoSymbolFile file, string file_name, byte[] guid, byte[] checksum)
 700                         : this (file, file_name)
 701                 {
 702                         this.guid = guid;
 703                         this.hash = checksum;
 704                 }
 705
 706                 public byte[] Checksum {
 707                         get {
 708                                 return hash;
 709                         }
 710                 }
 711
 712                 internal void WriteData (MyBinaryWriter bw)
 713                 {
 714                         DataOffset = (int) bw.BaseStream.Position;
 715                         bw.Write (file_name);
 716
 717                         if (guid == null)
 718                                 guid = new byte[16];
 719
 720                         if (hash == null) {
 721                                 try {
 722                                     using (FileStream fs = new FileStream (file_name, FileMode.Open, FileAccess.Read)) {
 723                                         MD5 md5 = MD5.Create ();
 724                                         hash = md5.ComputeHash (fs);
 725                                     }
 726                                 } catch {
 727                                         hash = new byte [16];
 728                                 }
 729                         }
 730
 731                         bw.Write (guid);
 732                         bw.Write (hash);
 733                         bw.Write ((byte) (auto_generated ? 1 : 0));
 734                 }
 735
 736                 internal void Write (BinaryWriter bw)
 737                 {
 738                         bw.Write (Index);
 739                         bw.Write (DataOffset);
 740                 }
 741
 742                 internal SourceFileEntry (MonoSymbolFile file, MyBinaryReader reader)
 743                 {
 744                         this.file = file;
 745
 746                         Index = reader.ReadInt32 ();
 747                         DataOffset = reader.ReadInt32 ();
 748
 749                         int old_pos = (int) reader.BaseStream.Position;
 750                         reader.BaseStream.Position = DataOffset;
 751
 752                         file_name = reader.ReadString ();
 753                         guid = reader.ReadBytes (16);
 754                         hash = reader.ReadBytes (16);
 755                         auto_generated = reader.ReadByte () == 1;
 756
 757                         reader.BaseStream.Position = old_pos;
 758                 }
 759
 760                 public string FileName {
 761                         get { return file_name; }
 762                         set { file_name = value; }
 763                 }
 764
 765                 public bool AutoGenerated {
 766                         get { return auto_generated; }
 767                 }
 768
 769                 public void SetAutoGenerated ()
 770                 {
 771                         if (!creating)
 772                                 throw new InvalidOperationException ();
 773
 774                         auto_generated = true;
 775                         file.OffsetTable.FileFlags |= OffsetTable.Flags.IsAspxSource;
 776                 }
 777
 778                 public bool CheckChecksum ()
 779                 {
 780                         try {
 781                                 using (FileStream fs = new FileStream (file_name, FileMode.Open)) {
 782                                         MD5 md5 = MD5.Create ();
 783                                         byte[] data = md5.ComputeHash (fs);
 784                                         for (int i = 0; i < 16; i++)
 785                                                 if (data [i] != hash [i])
 786                                                         return false;
 787                                         return true;
 788                                 }
 789                         } catch {
 790                                 return false;
 791                         }
 792                 }
 793
 794                 public override string ToString ()
 795                 {
 796                         return String.Format ("SourceFileEntry ({0}:{1})", Index, DataOffset);
 797                 }
 798         }
 799
 800         public class LineNumberTable
 801         {
 802                 protected LineNumberEntry[] _line_numbers;
 803                 public LineNumberEntry[] LineNumbers {
 804                         get { return _line_numbers; }
 805                 }
 806
 807                 public readonly int LineBase;
 808                 public readonly int LineRange;
 809                 public readonly byte OpcodeBase;
 810                 public readonly int MaxAddressIncrement;
 811
 812 #region Configurable constants
 813                 public const int Default_LineBase = -1;
 814                 public const int Default_LineRange = 8;
 815                 public const byte Default_OpcodeBase = 9;
 816
 817 #endregion
 818
 819                 public const byte DW_LNS_copy = 1;
 820                 public const byte DW_LNS_advance_pc = 2;
 821                 public const byte DW_LNS_advance_line = 3;
 822                 public const byte DW_LNS_set_file = 4;
 823                 public const byte DW_LNS_const_add_pc = 8;
 824
 825                 public const byte DW_LNE_end_sequence = 1;
 826
 827                 // MONO extensions.
 828                 public const byte DW_LNE_MONO_negate_is_hidden = 0x40;
 829
 830                 internal const byte DW_LNE_MONO__extensions_start = 0x40;
 831                 internal const byte DW_LNE_MONO__extensions_end   = 0x7f;
 832
 833                 protected LineNumberTable (MonoSymbolFile file)
 834                 {
 835                         this.LineBase = file.OffsetTable.LineNumberTable_LineBase;
 836                         this.LineRange = file.OffsetTable.LineNumberTable_LineRange;
 837                         this.OpcodeBase = (byte) file.OffsetTable.LineNumberTable_OpcodeBase;
 838                         this.MaxAddressIncrement = (255 - OpcodeBase) / LineRange;
 839                 }
 840
 841                 internal LineNumberTable (MonoSymbolFile file, LineNumberEntry[] lines)
 842                         : this (file)
 843                 {
 844                         this._line_numbers = lines;
 845                 }
 846
 847                 internal void Write (MonoSymbolFile file, MyBinaryWriter bw, bool hasColumnsInfo, bool hasEndInfo)
 848                 {
 849                         int start = (int) bw.BaseStream.Position;
 850
 851                         bool last_is_hidden = false;
 852                         int last_line = 1, last_offset = 0, last_file = 1;
 853                         for (int i = 0; i < LineNumbers.Length; i++) {
 854                                 int line_inc = LineNumbers [i].Row - last_line;
 855                                 int offset_inc = LineNumbers [i].Offset - last_offset;
 856
 857                                 if (LineNumbers [i].File != last_file) {
 858                                         bw.Write (DW_LNS_set_file);
 859                                         bw.WriteLeb128 (LineNumbers [i].File);
 860                                         last_file = LineNumbers [i].File;
 861                                 }
 862
 863                                 if (LineNumbers [i].IsHidden != last_is_hidden) {
 864                                         bw.Write ((byte) 0);
 865                                         bw.Write ((byte) 1);
 866                                         bw.Write (DW_LNE_MONO_negate_is_hidden);
 867                                         last_is_hidden = LineNumbers [i].IsHidden;
 868                                 }
 869
 870                                 if (offset_inc >= MaxAddressIncrement) {
 871                                         if (offset_inc < 2 * MaxAddressIncrement) {
 872                                                 bw.Write (DW_LNS_const_add_pc);
 873                                                 offset_inc -= MaxAddressIncrement;
 874                                         } else {
 875                                                 bw.Write (DW_LNS_advance_pc);
 876                                                 bw.WriteLeb128 (offset_inc);
 877                                                 offset_inc = 0;
 878                                         }
 879                                 }
 880
 881                                 if ((line_inc < LineBase) || (line_inc >= LineBase + LineRange)) {
 882                                         bw.Write (DW_LNS_advance_line);
 883                                         bw.WriteLeb128 (line_inc);
 884                                         if (offset_inc != 0) {
 885                                                 bw.Write (DW_LNS_advance_pc);
 886                                                 bw.WriteLeb128 (offset_inc);
 887                                         }
 888                                         bw.Write (DW_LNS_copy);
 889                                 } else {
 890                                         byte opcode;
 891                                         opcode = (byte) (line_inc - LineBase + (LineRange * offset_inc) +
 892                                                          OpcodeBase);
 893                                         bw.Write (opcode);
 894                                 }
 895
 896                                 last_line = LineNumbers [i].Row;
 897                                 last_offset = LineNumbers [i].Offset;
 898                         }
 899
 900                         bw.Write ((byte) 0);
 901                         bw.Write ((byte) 1);
 902                         bw.Write (DW_LNE_end_sequence);
 903
 904                         if (hasColumnsInfo) {
 905                                 for (int i = 0; i < LineNumbers.Length; i++) {
 906                                         var ln = LineNumbers [i];
 907                                         if (ln.Row >= 0)
 908                                                 bw.WriteLeb128 (ln.Column);
 909                                 }
 910                         }
 911
 912                         if (hasEndInfo) {
 913                                 for (int i = 0; i < LineNumbers.Length; i++) {
 914                                         var ln = LineNumbers [i];
 915                                         if (ln.EndRow == -1 || ln.EndColumn == -1 || ln.Row > ln.EndRow) {
 916                                                 bw.WriteLeb128 (0xffffff);
 917                                         } else {
 918                                                 bw.WriteLeb128 (ln.EndRow - ln.Row);
 919                                                 bw.WriteLeb128 (ln.EndColumn);
 920                                         }
 921                                 }
 922                         }
 923
 924                         file.ExtendedLineNumberSize += (int) bw.BaseStream.Position - start;
 925                 }
 926
 927                 internal static LineNumberTable Read (MonoSymbolFile file, MyBinaryReader br, bool readColumnsInfo, bool readEndInfo)
 928                 {
 929                         LineNumberTable lnt = new LineNumberTable (file);
 930                         lnt.DoRead (file, br, readColumnsInfo, readEndInfo);
 931                         return lnt;
 932                 }
 933
 934                 void DoRead (MonoSymbolFile file, MyBinaryReader br, bool includesColumns, bool includesEnds)
 935                 {
 936                         var lines = new List<LineNumberEntry> ();
 937
 938                         bool is_hidden = false, modified = false;
 939                         int stm_line = 1, stm_offset = 0, stm_file = 1;
 940                         while (true) {
 941                                 byte opcode = br.ReadByte ();
 942
 943                                 if (opcode == 0) {
 944                                         byte size = br.ReadByte ();
 945                                         long end_pos = br.BaseStream.Position + size;
 946                                         opcode = br.ReadByte ();
 947
 948                                         if (opcode == DW_LNE_end_sequence) {
 949                                                 if (modified)
 950                                                         lines.Add (new LineNumberEntry (
 951                                                                 stm_file, stm_line, -1, stm_offset, is_hidden));
 952                                                 break;
 953                                         } else if (opcode == DW_LNE_MONO_negate_is_hidden) {
 954                                                 is_hidden = !is_hidden;
 955                                                 modified = true;
 956                                         } else if ((opcode >= DW_LNE_MONO__extensions_start) &&
 957                                                    (opcode <= DW_LNE_MONO__extensions_end)) {
 958                                                 ; // reserved for future extensions
 959                                         } else {
 960                                                 throw new MonoSymbolFileException ("Unknown extended opcode {0:x}", opcode);
 961                                         }
 962
 963                                         br.BaseStream.Position = end_pos;
 964                                         continue;
 965                                 } else if (opcode < OpcodeBase) {
 966                                         switch (opcode) {
 967                                         case DW_LNS_copy:
 968                                                 lines.Add (new LineNumberEntry (
 969                                                         stm_file, stm_line, -1, stm_offset, is_hidden));
 970                                                 modified = false;
 971                                                 break;
 972                                         case DW_LNS_advance_pc:
 973                                                 stm_offset += br.ReadLeb128 ();
 974                                                 modified = true;
 975                                                 break;
 976                                         case DW_LNS_advance_line:
 977                                                 stm_line += br.ReadLeb128 ();
 978                                                 modified = true;
 979                                                 break;
 980                                         case DW_LNS_set_file:
 981                                                 stm_file = br.ReadLeb128 ();
 982                                                 modified = true;
 983                                                 break;
 984                                         case DW_LNS_const_add_pc:
 985                                                 stm_offset += MaxAddressIncrement;
 986                                                 modified = true;
 987                                                 break;
 988                                         default:
 989                                                 throw new MonoSymbolFileException (
 990                                                         "Unknown standard opcode {0:x} in LNT",
 991                                                         opcode);
 992                                         }
 993                                 } else {
 994                                         opcode -= OpcodeBase;
 995
 996                                         stm_offset += opcode / LineRange;
 997                                         stm_line += LineBase + (opcode % LineRange);
 998                                         lines.Add (new LineNumberEntry (
 999                                                 stm_file, stm_line, -1, stm_offset, is_hidden));
1000                                         modified = false;
1001                                 }
1002                         }
1003
1004                         _line_numbers = lines.ToArray ();
1005
1006                         if (includesColumns) {
1007                                 for (int i = 0; i < _line_numbers.Length; ++i) {
1008                                         var ln = _line_numbers[i];
1009                                         if (ln.Row >= 0)
1010                                                 ln.Column = br.ReadLeb128 ();
1011                                 }
1012                         }
1013                         if (includesEnds) {
1014                                 for (int i = 0; i < _line_numbers.Length; ++i) {
1015                                         var ln = _line_numbers[i];
1016
1017                                         int row = br.ReadLeb128 ();
1018                                         if (row == 0xffffff) {
1019                                                 ln.EndRow = -1;
1020                                                 ln.EndColumn = -1;
1021                                         } else {
1022                                                 ln.EndRow = ln.Row + row;
1023                                                 ln.EndColumn = br.ReadLeb128 ();
1024                                         }
1025                                 }
1026                         }
1027                 }
1028
1029                 public bool GetMethodBounds (out LineNumberEntry start, out LineNumberEntry end)
1030                 {
1031                         if (_line_numbers.Length > 1) {
1032                                 start = _line_numbers [0];
1033                                 end = _line_numbers [_line_numbers.Length - 1];
1034                                 return true;
1035                         }
1036
1037                         start = LineNumberEntry.Null;
1038                         end = LineNumberEntry.Null;
1039                         return false;
1040                 }
1041         }
1042
1043         public class MethodEntry : IComparable
1044         {
1045                 #region This is actually written to the symbol file
1046                 public readonly int CompileUnitIndex;
1047                 public readonly int Token;
1048                 public readonly int NamespaceID;
1049
1050                 int DataOffset;
1051                 int LocalVariableTableOffset;
1052                 int LineNumberTableOffset;
1053                 int CodeBlockTableOffset;
1054                 int ScopeVariableTableOffset;
1055                 int RealNameOffset;
1056                 Flags flags;
1057                 #endregion
1058
1059                 int index;
1060
1061                 public Flags MethodFlags {
1062                         get { return flags; }
1063                 }
1064
1065                 public readonly CompileUnitEntry CompileUnit;
1066
1067                 LocalVariableEntry[] locals;
1068                 CodeBlockEntry[] code_blocks;
1069                 ScopeVariable[] scope_vars;
1070                 LineNumberTable lnt;
1071                 string real_name;
1072
1073                 public readonly MonoSymbolFile SymbolFile;
1074
1075                 public int Index {
1076                         get { return index; }
1077                         set { index = value; }
1078                 }
1079
1080                 [Flags]
1081                 public enum Flags
1082                 {
1083                         LocalNamesAmbiguous     = 1,
1084                         ColumnsInfoIncluded = 1 << 1,
1085                         EndInfoIncluded = 1 << 2
1086                 }
1087
1088                 public const int Size = 12;
1089
1090                 internal MethodEntry (MonoSymbolFile file, MyBinaryReader reader, int index)
1091                 {
1092                         this.SymbolFile = file;
1093                         this.index = index;
1094
1095                         Token = reader.ReadInt32 ();
1096                         DataOffset = reader.ReadInt32 ();
1097                         LineNumberTableOffset = reader.ReadInt32 ();
1098
1099                         long old_pos = reader.BaseStream.Position;
1100                         reader.BaseStream.Position = DataOffset;
1101
1102                         CompileUnitIndex = reader.ReadLeb128 ();
1103                         LocalVariableTableOffset = reader.ReadLeb128 ();
1104                         NamespaceID = reader.ReadLeb128 ();
1105
1106                         CodeBlockTableOffset = reader.ReadLeb128 ();
1107                         ScopeVariableTableOffset = reader.ReadLeb128 ();
1108
1109                         RealNameOffset = reader.ReadLeb128 ();
1110
1111                         flags = (Flags) reader.ReadLeb128 ();
1112
1113                         reader.BaseStream.Position = old_pos;
1114
1115                         CompileUnit = file.GetCompileUnit (CompileUnitIndex);
1116                 }
1117
1118                 internal MethodEntry (MonoSymbolFile file, CompileUnitEntry comp_unit,
1119                                       int token, ScopeVariable[] scope_vars,
1120                                       LocalVariableEntry[] locals, LineNumberEntry[] lines,
1121                                       CodeBlockEntry[] code_blocks, string real_name,
1122                                       Flags flags, int namespace_id)
1123                 {
1124                         this.SymbolFile = file;
1125                         this.real_name = real_name;
1126                         this.locals = locals;
1127                         this.code_blocks = code_blocks;
1128                         this.scope_vars = scope_vars;
1129                         this.flags = flags;
1130
1131                         index = -1;
1132
1133                         Token = token;
1134                         CompileUnitIndex = comp_unit.Index;
1135                         CompileUnit = comp_unit;
1136                         NamespaceID = namespace_id;
1137
1138                         CheckLineNumberTable (lines);
1139                         lnt = new LineNumberTable (file, lines);
1140                         file.NumLineNumbers += lines.Length;
1141
1142                         int num_locals = locals != null ? locals.Length : 0;
1143
1144                         if (num_locals <= 32) {
1145                                 // Most of the time, the O(n^2) factor is actually
1146                                 // less than the cost of allocating the hash table,
1147                                 // 32 is a rough number obtained through some testing.
1148
1149                                 for (int i = 0; i < num_locals; i ++) {
1150                                         string nm = locals [i].Name;
1151
1152                                         for (int j = i + 1; j < num_locals; j ++) {
1153                                                 if (locals [j].Name == nm) {
1154                                                         flags |= Flags.LocalNamesAmbiguous;
1155                                                         goto locals_check_done;
1156                                                 }
1157                                         }
1158                                 }
1159                         locals_check_done :
1160                                 ;
1161                         } else {
1162                                 var local_names = new Dictionary<string, LocalVariableEntry> ();
1163                                 foreach (LocalVariableEntry local in locals) {
1164                                         if (local_names.ContainsKey (local.Name)) {
1165                                                 flags |= Flags.LocalNamesAmbiguous;
1166                                                 break;
1167                                         }
1168                                         local_names.Add (local.Name, local);
1169                                 }
1170                         }
1171                 }
1172
1173                 static void CheckLineNumberTable (LineNumberEntry[] line_numbers)
1174                 {
1175                         int last_offset = -1;
1176                         int last_row = -1;
1177
1178                         if (line_numbers == null)
1179                                 return;
1180
1181                         for (int i = 0; i < line_numbers.Length; i++) {
1182                                 LineNumberEntry line = line_numbers [i];
1183
1184                                 if (line.Equals (LineNumberEntry.Null))
1185                                         throw new MonoSymbolFileException ();
1186
1187                                 if (line.Offset < last_offset)
1188                                         throw new MonoSymbolFileException ();
1189
1190                                 if (line.Offset > last_offset) {
1191                                         last_row = line.Row;
1192                                         last_offset = line.Offset;
1193                                 } else if (line.Row > last_row) {
1194                                         last_row = line.Row;
1195                                 }
1196                         }
1197                 }
1198
1199                 internal void Write (MyBinaryWriter bw)
1200                 {
1201                         if ((index <= 0) || (DataOffset == 0))
1202                                 throw new InvalidOperationException ();
1203
1204                         bw.Write (Token);
1205                         bw.Write (DataOffset);
1206                         bw.Write (LineNumberTableOffset);
1207                 }
1208
1209                 internal void WriteData (MonoSymbolFile file, MyBinaryWriter bw)
1210                 {
1211                         if (index <= 0)
1212                                 throw new InvalidOperationException ();
1213
1214                         LocalVariableTableOffset = (int) bw.BaseStream.Position;
1215                         int num_locals = locals != null ? locals.Length : 0;
1216                         bw.WriteLeb128 (num_locals);
1217                         for (int i = 0; i < num_locals; i++)
1218                                 locals [i].Write (file, bw);
1219                         file.LocalCount += num_locals;
1220
1221                         CodeBlockTableOffset = (int) bw.BaseStream.Position;
1222                         int num_code_blocks = code_blocks != null ? code_blocks.Length : 0;
1223                         bw.WriteLeb128 (num_code_blocks);
1224                         for (int i = 0; i < num_code_blocks; i++)
1225                                 code_blocks [i].Write (bw);
1226
1227                         ScopeVariableTableOffset = (int) bw.BaseStream.Position;
1228                         int num_scope_vars = scope_vars != null ? scope_vars.Length : 0;
1229                         bw.WriteLeb128 (num_scope_vars);
1230                         for (int i = 0; i < num_scope_vars; i++)
1231                                 scope_vars [i].Write (bw);
1232
1233                         if (real_name != null) {
1234                                 RealNameOffset = (int) bw.BaseStream.Position;
1235                                 bw.Write (real_name);
1236                         }
1237
1238                         foreach (var lne in lnt.LineNumbers) {
1239                                 if (lne.EndRow != -1 || lne.EndColumn != -1)
1240                                         flags |= Flags.EndInfoIncluded;
1241                         }
1242
1243                         LineNumberTableOffset = (int) bw.BaseStream.Position;
1244                         lnt.Write (file, bw, (flags & Flags.ColumnsInfoIncluded) != 0, (flags & Flags.EndInfoIncluded) != 0);
1245
1246                         DataOffset = (int) bw.BaseStream.Position;
1247
1248                         bw.WriteLeb128 (CompileUnitIndex);
1249                         bw.WriteLeb128 (LocalVariableTableOffset);
1250                         bw.WriteLeb128 (NamespaceID);
1251
1252                         bw.WriteLeb128 (CodeBlockTableOffset);
1253                         bw.WriteLeb128 (ScopeVariableTableOffset);
1254
1255                         bw.WriteLeb128 (RealNameOffset);
1256                         bw.WriteLeb128 ((int) flags);
1257                 }
1258
1259                 public void ReadAll ()
1260                 {
1261                         GetLineNumberTable ();
1262                         GetLocals ();
1263                         GetCodeBlocks ();
1264                         GetScopeVariables ();
1265                         GetRealName ();
1266                 }
1267
1268                 public LineNumberTable GetLineNumberTable ()
1269                 {
1270                         lock (SymbolFile) {
1271                                 if (lnt != null)
1272                                         return lnt;
1273
1274                                 if (LineNumberTableOffset == 0)
1275                                         return null;
1276
1277                                 MyBinaryReader reader = SymbolFile.BinaryReader;
1278                                 long old_pos = reader.BaseStream.Position;
1279                                 reader.BaseStream.Position = LineNumberTableOffset;
1280
1281                                 lnt = LineNumberTable.Read (SymbolFile, reader, (flags & Flags.ColumnsInfoIncluded) != 0, (flags & Flags.EndInfoIncluded) != 0);
1282
1283                                 reader.BaseStream.Position = old_pos;
1284                                 return lnt;
1285                         }
1286                 }
1287
1288                 public LocalVariableEntry[] GetLocals ()
1289                 {
1290                         lock (SymbolFile) {
1291                                 if (locals != null)
1292                                         return locals;
1293
1294                                 if (LocalVariableTableOffset == 0)
1295                                         return null;
1296
1297                                 MyBinaryReader reader = SymbolFile.BinaryReader;
1298                                 long old_pos = reader.BaseStream.Position;
1299                                 reader.BaseStream.Position = LocalVariableTableOffset;
1300
1301                                 int num_locals = reader.ReadLeb128 ();
1302                                 locals = new LocalVariableEntry [num_locals];
1303
1304                                 for (int i = 0; i < num_locals; i++)
1305                                         locals [i] = new LocalVariableEntry (SymbolFile, reader);
1306
1307                                 reader.BaseStream.Position = old_pos;
1308                                 return locals;
1309                         }
1310                 }
1311
1312                 public CodeBlockEntry[] GetCodeBlocks ()
1313                 {
1314                         lock (SymbolFile) {
1315                                 if (code_blocks != null)
1316                                         return code_blocks;
1317
1318                                 if (CodeBlockTableOffset == 0)
1319                                         return null;
1320
1321                                 MyBinaryReader reader = SymbolFile.BinaryReader;
1322                                 long old_pos = reader.BaseStream.Position;
1323                                 reader.BaseStream.Position = CodeBlockTableOffset;
1324
1325                                 int num_code_blocks = reader.ReadLeb128 ();
1326                                 code_blocks = new CodeBlockEntry [num_code_blocks];
1327
1328                                 for (int i = 0; i < num_code_blocks; i++)
1329                                         code_blocks [i] = new CodeBlockEntry (i, reader);
1330
1331                                 reader.BaseStream.Position = old_pos;
1332                                 return code_blocks;
1333                         }
1334                 }
1335
1336                 public ScopeVariable[] GetScopeVariables ()
1337                 {
1338                         lock (SymbolFile) {
1339                                 if (scope_vars != null)
1340                                         return scope_vars;
1341
1342                                 if (ScopeVariableTableOffset == 0)
1343                                         return null;
1344
1345                                 MyBinaryReader reader = SymbolFile.BinaryReader;
1346                                 long old_pos = reader.BaseStream.Position;
1347                                 reader.BaseStream.Position = ScopeVariableTableOffset;
1348
1349                                 int num_scope_vars = reader.ReadLeb128 ();
1350                                 scope_vars = new ScopeVariable [num_scope_vars];
1351
1352                                 for (int i = 0; i < num_scope_vars; i++)
1353                                         scope_vars [i] = new ScopeVariable (reader);
1354
1355                                 reader.BaseStream.Position = old_pos;
1356                                 return scope_vars;
1357                         }
1358                 }
1359
1360                 public string GetRealName ()
1361                 {
1362                         lock (SymbolFile) {
1363                                 if (real_name != null)
1364                                         return real_name;
1365
1366                                 if (RealNameOffset == 0)
1367                                         return null;
1368
1369                                 real_name = SymbolFile.BinaryReader.ReadString (RealNameOffset);
1370                                 return real_name;
1371                         }
1372                 }
1373
1374                 public int CompareTo (object obj)
1375                 {
1376                         MethodEntry method = (MethodEntry) obj;
1377
1378                         if (method.Token < Token)
1379                                 return 1;
1380                         else if (method.Token > Token)
1381                                 return -1;
1382                         else
1383                                 return 0;
1384                 }
1385
1386                 public override string ToString ()
1387                 {
1388                         return String.Format ("[Method {0}:{1:x}:{2}:{3}]",
1389                                               index, Token, CompileUnitIndex, CompileUnit);
1390                 }
1391         }
1392
1393         public struct NamespaceEntry
1394         {
1395                 #region This is actually written to the symbol file
1396                 public readonly string Name;
1397                 public readonly int Index;
1398                 public readonly int Parent;
1399                 public readonly string[] UsingClauses;
1400                 #endregion
1401
1402                 public NamespaceEntry (string name, int index, string[] using_clauses, int parent)
1403                 {
1404                         this.Name = name;
1405                         this.Index = index;
1406                         this.Parent = parent;
1407                         this.UsingClauses = using_clauses != null ? using_clauses : new string [0];
1408                 }
1409
1410                 internal NamespaceEntry (MonoSymbolFile file, MyBinaryReader reader)
1411                 {
1412                         Name = reader.ReadString ();
1413                         Index = reader.ReadLeb128 ();
1414                         Parent = reader.ReadLeb128 ();
1415
1416                         int count = reader.ReadLeb128 ();
1417                         UsingClauses = new string [count];
1418                         for (int i = 0; i < count; i++)
1419                                 UsingClauses [i] = reader.ReadString ();
1420                 }
1421
1422                 internal void Write (MonoSymbolFile file, MyBinaryWriter bw)
1423                 {
1424                         bw.Write (Name);
1425                         bw.WriteLeb128 (Index);
1426                         bw.WriteLeb128 (Parent);
1427                         bw.WriteLeb128 (UsingClauses.Length);
1428                         foreach (string uc in UsingClauses)
1429                                 bw.Write (uc);
1430                 }
1431
1432                 public override string ToString ()
1433                 {
1434                         return String.Format ("[Namespace {0}:{1}:{2}]", Name, Index, Parent);
1435                 }
1436         }
1437 }