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 readonly int File;
 188                 public readonly int Offset;
 189                 public readonly bool IsHidden;  // Obsolete is never used
 190                 #endregion
 191
 192                 public sealed class LocationComparer : IComparer<LineNumberEntry>
 193                 {
 194                         public static readonly LocationComparer Default = new LocationComparer ();
 195
 196                         public int Compare (LineNumberEntry l1, LineNumberEntry l2)
 197                         {
 198                                 return l1.Row == l2.Row ?
 199                                         l1.Column.CompareTo (l2.Column) :
 200                                         l1.Row.CompareTo (l2.Row);
 201                         }
 202                 }
 203
 204                 public static readonly LineNumberEntry Null = new LineNumberEntry (0, 0, 0, 0);
 205
 206                 public LineNumberEntry (int file, int row, int column, int offset)
 207                         : this (file, row, offset, column, false)
 208                 {
 209                 }
 210
 211                 public LineNumberEntry (int file, int row, int offset)
 212                         : this (file, row, -1, offset, false)
 213                 {
 214                 }
 215
 216                 public LineNumberEntry (int file, int row, int column, int offset, bool is_hidden)
 217                 {
 218                         this.File = file;
 219                         this.Row = row;
 220                         this.Column = column;
 221                         this.Offset = offset;
 222                         this.IsHidden = is_hidden;
 223                 }
 224
 225                 public override string ToString ()
 226                 {
 227                         return String.Format ("[Line {0}:{1,2}:{3}]", File, Row, Column, Offset);
 228                 }
 229         }
 230
 231         public class CodeBlockEntry
 232         {
 233                 public int Index;
 234                 #region This is actually written to the symbol file
 235                 public int Parent;
 236                 public Type BlockType;
 237                 public int StartOffset;
 238                 public int EndOffset;
 239                 #endregion
 240
 241                 public enum Type {
 242                         Lexical                 = 1,
 243                         CompilerGenerated       = 2,
 244                         IteratorBody            = 3,
 245                         IteratorDispatcher      = 4
 246                 }
 247
 248                 public CodeBlockEntry (int index, int parent, Type type, int start_offset)
 249                 {
 250                         this.Index = index;
 251                         this.Parent = parent;
 252                         this.BlockType = type;
 253                         this.StartOffset = start_offset;
 254                 }
 255
 256                 internal CodeBlockEntry (int index, MyBinaryReader reader)
 257                 {
 258                         this.Index = index;
 259                         int type_flag = reader.ReadLeb128 ();
 260                         BlockType = (Type) (type_flag & 0x3f);
 261                         this.Parent = reader.ReadLeb128 ();
 262                         this.StartOffset = reader.ReadLeb128 ();
 263                         this.EndOffset = reader.ReadLeb128 ();
 264
 265                         /* Reserved for future extensions. */
 266                         if ((type_flag & 0x40) != 0) {
 267                                 int data_size = reader.ReadInt16 ();
 268                                 reader.BaseStream.Position += data_size;
 269                         }
 270                 }
 271
 272                 public void Close (int end_offset)
 273                 {
 274                         this.EndOffset = end_offset;
 275                 }
 276
 277                 internal void Write (MyBinaryWriter bw)
 278                 {
 279                         bw.WriteLeb128 ((int) BlockType);
 280                         bw.WriteLeb128 (Parent);
 281                         bw.WriteLeb128 (StartOffset);
 282                         bw.WriteLeb128 (EndOffset);
 283                 }
 284
 285                 public override string ToString ()
 286                 {
 287                         return String.Format ("[CodeBlock {0}:{1}:{2}:{3}:{4}]",
 288                                               Index, Parent, BlockType, StartOffset, EndOffset);
 289                 }
 290         }
 291
 292         public struct LocalVariableEntry
 293         {
 294                 #region This is actually written to the symbol file
 295                 public readonly int Index;
 296                 public readonly string Name;
 297                 public readonly int BlockIndex;
 298                 #endregion
 299
 300                 public LocalVariableEntry (int index, string name, int block)
 301                 {
 302                         this.Index = index;
 303                         this.Name = name;
 304                         this.BlockIndex = block;
 305                 }
 306
 307                 internal LocalVariableEntry (MonoSymbolFile file, MyBinaryReader reader)
 308                 {
 309                         Index = reader.ReadLeb128 ();
 310                         Name = reader.ReadString ();
 311                         BlockIndex = reader.ReadLeb128 ();
 312                 }
 313
 314                 internal void Write (MonoSymbolFile file, MyBinaryWriter bw)
 315                 {
 316                         bw.WriteLeb128 (Index);
 317                         bw.Write (Name);
 318                         bw.WriteLeb128 (BlockIndex);
 319                 }
 320
 321                 public override string ToString ()
 322                 {
 323                         return String.Format ("[LocalVariable {0}:{1}:{2}]",
 324                                               Name, Index, BlockIndex - 1);
 325                 }
 326         }
 327
 328         public struct CapturedVariable
 329         {
 330                 #region This is actually written to the symbol file
 331                 public readonly string Name;
 332                 public readonly string CapturedName;
 333                 public readonly CapturedKind Kind;
 334                 #endregion
 335
 336                 public enum CapturedKind : byte
 337                 {
 338                         Local,
 339                         Parameter,
 340                         This
 341                 }
 342
 343                 public CapturedVariable (string name, string captured_name,
 344                                          CapturedKind kind)
 345                 {
 346                         this.Name = name;
 347                         this.CapturedName = captured_name;
 348                         this.Kind = kind;
 349                 }
 350
 351                 internal CapturedVariable (MyBinaryReader reader)
 352                 {
 353                         Name = reader.ReadString ();
 354                         CapturedName = reader.ReadString ();
 355                         Kind = (CapturedKind) reader.ReadByte ();
 356                 }
 357
 358                 internal void Write (MyBinaryWriter bw)
 359                 {
 360                         bw.Write (Name);
 361                         bw.Write (CapturedName);
 362                         bw.Write ((byte) Kind);
 363                 }
 364
 365                 public override string ToString ()
 366                 {
 367                         return String.Format ("[CapturedVariable {0}:{1}:{2}]",
 368                                               Name, CapturedName, Kind);
 369                 }
 370         }
 371
 372         public struct CapturedScope
 373         {
 374                 #region This is actually written to the symbol file
 375                 public readonly int Scope;
 376                 public readonly string CapturedName;
 377                 #endregion
 378
 379                 public CapturedScope (int scope, string captured_name)
 380                 {
 381                         this.Scope = scope;
 382                         this.CapturedName = captured_name;
 383                 }
 384
 385                 internal CapturedScope (MyBinaryReader reader)
 386                 {
 387                         Scope = reader.ReadLeb128 ();
 388                         CapturedName = reader.ReadString ();
 389                 }
 390
 391                 internal void Write (MyBinaryWriter bw)
 392                 {
 393                         bw.WriteLeb128 (Scope);
 394                         bw.Write (CapturedName);
 395                 }
 396
 397                 public override string ToString ()
 398                 {
 399                         return String.Format ("[CapturedScope {0}:{1}]",
 400                                               Scope, CapturedName);
 401                 }
 402         }
 403
 404         public struct ScopeVariable
 405         {
 406                 #region This is actually written to the symbol file
 407                 public readonly int Scope;
 408                 public readonly int Index;
 409                 #endregion
 410
 411                 public ScopeVariable (int scope, int index)
 412                 {
 413                         this.Scope = scope;
 414                         this.Index = index;
 415                 }
 416
 417                 internal ScopeVariable (MyBinaryReader reader)
 418                 {
 419                         Scope = reader.ReadLeb128 ();
 420                         Index = reader.ReadLeb128 ();
 421                 }
 422
 423                 internal void Write (MyBinaryWriter bw)
 424                 {
 425                         bw.WriteLeb128 (Scope);
 426                         bw.WriteLeb128 (Index);
 427                 }
 428
 429                 public override string ToString ()
 430                 {
 431                         return String.Format ("[ScopeVariable {0}:{1}]", Scope, Index);
 432                 }
 433         }
 434
 435         public class AnonymousScopeEntry
 436         {
 437                 #region This is actually written to the symbol file
 438                 public readonly int ID;
 439                 #endregion
 440
 441                 List<CapturedVariable> captured_vars = new List<CapturedVariable> ();
 442                 List<CapturedScope> captured_scopes = new List<CapturedScope> ();
 443
 444                 public AnonymousScopeEntry (int id)
 445                 {
 446                         this.ID = id;
 447                 }
 448
 449                 internal AnonymousScopeEntry (MyBinaryReader reader)
 450                 {
 451                         ID = reader.ReadLeb128 ();
 452
 453                         int num_captured_vars = reader.ReadLeb128 ();
 454                         for (int i = 0; i < num_captured_vars; i++)
 455                                 captured_vars.Add (new CapturedVariable (reader));
 456
 457                         int num_captured_scopes = reader.ReadLeb128 ();
 458                         for (int i = 0; i < num_captured_scopes; i++)
 459                                 captured_scopes.Add (new CapturedScope (reader));
 460                 }
 461
 462                 internal void AddCapturedVariable (string name, string captured_name,
 463                                                    CapturedVariable.CapturedKind kind)
 464                 {
 465                         captured_vars.Add (new CapturedVariable (name, captured_name, kind));
 466                 }
 467
 468                 public CapturedVariable[] CapturedVariables {
 469                         get {
 470                                 CapturedVariable[] retval = new CapturedVariable [captured_vars.Count];
 471                                 captured_vars.CopyTo (retval, 0);
 472                                 return retval;
 473                         }
 474                 }
 475
 476                 internal void AddCapturedScope (int scope, string captured_name)
 477                 {
 478                         captured_scopes.Add (new CapturedScope (scope, captured_name));
 479                 }
 480
 481                 public CapturedScope[] CapturedScopes {
 482                         get {
 483                                 CapturedScope[] retval = new CapturedScope [captured_scopes.Count];
 484                                 captured_scopes.CopyTo (retval, 0);
 485                                 return retval;
 486                         }
 487                 }
 488
 489                 internal void Write (MyBinaryWriter bw)
 490                 {
 491                         bw.WriteLeb128 (ID);
 492
 493                         bw.WriteLeb128 (captured_vars.Count);
 494                         foreach (CapturedVariable cv in captured_vars)
 495                                 cv.Write (bw);
 496
 497                         bw.WriteLeb128 (captured_scopes.Count);
 498                         foreach (CapturedScope cs in captured_scopes)
 499                                 cs.Write (bw);
 500                 }
 501
 502                 public override string ToString ()
 503                 {
 504                         return String.Format ("[AnonymousScope {0}]", ID);
 505                 }
 506         }
 507
 508         public class CompileUnitEntry : ICompileUnit
 509         {
 510                 #region This is actually written to the symbol file
 511                 public readonly int Index;
 512                 int DataOffset;
 513                 #endregion
 514
 515                 MonoSymbolFile file;
 516                 SourceFileEntry source;
 517                 List<SourceFileEntry> include_files;
 518                 List<NamespaceEntry> namespaces;
 519
 520                 bool creating;
 521
 522                 public static int Size {
 523                         get { return 8; }
 524                 }
 525
 526                 CompileUnitEntry ICompileUnit.Entry {
 527                         get { return this; }
 528                 }
 529
 530                 public CompileUnitEntry (MonoSymbolFile file, SourceFileEntry source)
 531                 {
 532                         this.file = file;
 533                         this.source = source;
 534
 535                         this.Index = file.AddCompileUnit (this);
 536
 537                         creating = true;
 538                         namespaces = new List<NamespaceEntry> ();
 539                 }
 540
 541                 public void AddFile (SourceFileEntry file)
 542                 {
 543                         if (!creating)
 544                                 throw new InvalidOperationException ();
 545
 546                         if (include_files == null)
 547                                 include_files = new List<SourceFileEntry> ();
 548
 549                         include_files.Add (file);
 550                 }
 551
 552                 public SourceFileEntry SourceFile {
 553                         get {
 554                                 if (creating)
 555                                         return source;
 556
 557                                 ReadData ();
 558                                 return source;
 559                         }
 560                 }
 561
 562                 public int DefineNamespace (string name, string[] using_clauses, int parent)
 563                 {
 564                         if (!creating)
 565                                 throw new InvalidOperationException ();
 566
 567                         int index = file.GetNextNamespaceIndex ();
 568                         NamespaceEntry ns = new NamespaceEntry (name, index, using_clauses, parent);
 569                         namespaces.Add (ns);
 570                         return index;
 571                 }
 572
 573                 internal void WriteData (MyBinaryWriter bw)
 574                 {
 575                         DataOffset = (int) bw.BaseStream.Position;
 576                         bw.WriteLeb128 (source.Index);
 577
 578                         int count_includes = include_files != null ? include_files.Count : 0;
 579                         bw.WriteLeb128 (count_includes);
 580                         if (include_files != null) {
 581                                 foreach (SourceFileEntry entry in include_files)
 582                                         bw.WriteLeb128 (entry.Index);
 583                         }
 584
 585                         bw.WriteLeb128 (namespaces.Count);
 586                         foreach (NamespaceEntry ns in namespaces)
 587                                 ns.Write (file, bw);
 588                 }
 589
 590                 internal void Write (BinaryWriter bw)
 591                 {
 592                         bw.Write (Index);
 593                         bw.Write (DataOffset);
 594                 }
 595
 596                 internal CompileUnitEntry (MonoSymbolFile file, MyBinaryReader reader)
 597                 {
 598                         this.file = file;
 599
 600                         Index = reader.ReadInt32 ();
 601                         DataOffset = reader.ReadInt32 ();
 602                 }
 603
 604                 void ReadData ()
 605                 {
 606                         if (creating)
 607                                 throw new InvalidOperationException ();
 608
 609                         lock (file) {
 610                                 if (namespaces != null)
 611                                         return;
 612
 613                                 MyBinaryReader reader = file.BinaryReader;
 614                                 int old_pos = (int) reader.BaseStream.Position;
 615
 616                                 reader.BaseStream.Position = DataOffset;
 617
 618                                 int source_idx = reader.ReadLeb128 ();
 619                                 source = file.GetSourceFile (source_idx);
 620
 621                                 int count_includes = reader.ReadLeb128 ();
 622                                 if (count_includes > 0) {
 623                                         include_files = new List<SourceFileEntry> ();
 624                                         for (int i = 0; i < count_includes; i++)
 625                                                 include_files.Add (file.GetSourceFile (reader.ReadLeb128 ()));
 626                                 }
 627
 628                                 int count_ns = reader.ReadLeb128 ();
 629                                 namespaces = new List<NamespaceEntry> ();
 630                                 for (int i = 0; i < count_ns; i ++)
 631                                         namespaces.Add (new NamespaceEntry (file, reader));
 632
 633                                 reader.BaseStream.Position = old_pos;
 634                         }
 635                 }
 636
 637                 public NamespaceEntry[] Namespaces {
 638                         get {
 639                                 ReadData ();
 640                                 NamespaceEntry[] retval = new NamespaceEntry [namespaces.Count];
 641                                 namespaces.CopyTo (retval, 0);
 642                                 return retval;
 643                         }
 644                 }
 645
 646                 public SourceFileEntry[] IncludeFiles {
 647                         get {
 648                                 ReadData ();
 649                                 if (include_files == null)
 650                                         return new SourceFileEntry [0];
 651
 652                                 SourceFileEntry[] retval = new SourceFileEntry [include_files.Count];
 653                                 include_files.CopyTo (retval, 0);
 654                                 return retval;
 655                         }
 656                 }
 657         }
 658
 659         public class SourceFileEntry
 660         {
 661                 #region This is actually written to the symbol file
 662                 public readonly int Index;
 663                 int DataOffset;
 664                 #endregion
 665
 666                 MonoSymbolFile file;
 667                 string file_name;
 668                 byte[] guid;
 669                 byte[] hash;
 670                 bool creating;
 671                 bool auto_generated;
 672
 673                 public static int Size {
 674                         get { return 8; }
 675                 }
 676
 677                 public SourceFileEntry (MonoSymbolFile file, string file_name)
 678                 {
 679                         this.file = file;
 680                         this.file_name = file_name;
 681                         this.Index = file.AddSource (this);
 682
 683                         creating = true;
 684                 }
 685
 686                 public SourceFileEntry (MonoSymbolFile file, string file_name, byte[] guid, byte[] checksum)
 687                         : this (file, file_name)
 688                 {
 689                         this.guid = guid;
 690                         this.hash = checksum;
 691                 }
 692
 693                 public byte[] Checksum {
 694                         get {
 695                                 return hash;
 696                         }
 697                 }
 698
 699                 internal void WriteData (MyBinaryWriter bw)
 700                 {
 701                         DataOffset = (int) bw.BaseStream.Position;
 702                         bw.Write (file_name);
 703
 704                         if (guid == null)
 705                                 guid = new byte[16];
 706
 707                         if (hash == null) {
 708                                 try {
 709                                     using (FileStream fs = new FileStream (file_name, FileMode.Open, FileAccess.Read)) {
 710                                         MD5 md5 = MD5.Create ();
 711                                         hash = md5.ComputeHash (fs);
 712                                     }
 713                                 } catch {
 714                                         hash = new byte [16];
 715                                 }
 716                         }
 717
 718                         bw.Write (guid);
 719                         bw.Write (hash);
 720                         bw.Write ((byte) (auto_generated ? 1 : 0));
 721                 }
 722
 723                 internal void Write (BinaryWriter bw)
 724                 {
 725                         bw.Write (Index);
 726                         bw.Write (DataOffset);
 727                 }
 728
 729                 internal SourceFileEntry (MonoSymbolFile file, MyBinaryReader reader)
 730                 {
 731                         this.file = file;
 732
 733                         Index = reader.ReadInt32 ();
 734                         DataOffset = reader.ReadInt32 ();
 735
 736                         int old_pos = (int) reader.BaseStream.Position;
 737                         reader.BaseStream.Position = DataOffset;
 738
 739                         file_name = reader.ReadString ();
 740                         guid = reader.ReadBytes (16);
 741                         hash = reader.ReadBytes (16);
 742                         auto_generated = reader.ReadByte () == 1;
 743
 744                         reader.BaseStream.Position = old_pos;
 745                 }
 746
 747                 public string FileName {
 748                         get { return file_name; }
 749                 }
 750
 751                 public bool AutoGenerated {
 752                         get { return auto_generated; }
 753                 }
 754
 755                 public void SetAutoGenerated ()
 756                 {
 757                         if (!creating)
 758                                 throw new InvalidOperationException ();
 759
 760                         auto_generated = true;
 761                         file.OffsetTable.FileFlags |= OffsetTable.Flags.IsAspxSource;
 762                 }
 763
 764                 public bool CheckChecksum ()
 765                 {
 766                         try {
 767                                 using (FileStream fs = new FileStream (file_name, FileMode.Open)) {
 768                                         MD5 md5 = MD5.Create ();
 769                                         byte[] data = md5.ComputeHash (fs);
 770                                         for (int i = 0; i < 16; i++)
 771                                                 if (data [i] != hash [i])
 772                                                         return false;
 773                                         return true;
 774                                 }
 775                         } catch {
 776                                 return false;
 777                         }
 778                 }
 779
 780                 public override string ToString ()
 781                 {
 782                         return String.Format ("SourceFileEntry ({0}:{1})", Index, DataOffset);
 783                 }
 784         }
 785
 786         public class LineNumberTable
 787         {
 788                 protected LineNumberEntry[] _line_numbers;
 789                 public LineNumberEntry[] LineNumbers {
 790                         get { return _line_numbers; }
 791                 }
 792
 793                 public readonly int LineBase;
 794                 public readonly int LineRange;
 795                 public readonly byte OpcodeBase;
 796                 public readonly int MaxAddressIncrement;
 797
 798 #region Configurable constants
 799                 public const int Default_LineBase = -1;
 800                 public const int Default_LineRange = 8;
 801                 public const byte Default_OpcodeBase = 9;
 802
 803 #endregion
 804
 805                 public const byte DW_LNS_copy = 1;
 806                 public const byte DW_LNS_advance_pc = 2;
 807                 public const byte DW_LNS_advance_line = 3;
 808                 public const byte DW_LNS_set_file = 4;
 809                 public const byte DW_LNS_const_add_pc = 8;
 810
 811                 public const byte DW_LNE_end_sequence = 1;
 812
 813                 // MONO extensions.
 814                 public const byte DW_LNE_MONO_negate_is_hidden = 0x40;
 815
 816                 internal const byte DW_LNE_MONO__extensions_start = 0x40;
 817                 internal const byte DW_LNE_MONO__extensions_end   = 0x7f;
 818
 819                 protected LineNumberTable (MonoSymbolFile file)
 820                 {
 821                         this.LineBase = file.OffsetTable.LineNumberTable_LineBase;
 822                         this.LineRange = file.OffsetTable.LineNumberTable_LineRange;
 823                         this.OpcodeBase = (byte) file.OffsetTable.LineNumberTable_OpcodeBase;
 824                         this.MaxAddressIncrement = (255 - OpcodeBase) / LineRange;
 825                 }
 826
 827                 internal LineNumberTable (MonoSymbolFile file, LineNumberEntry[] lines)
 828                         : this (file)
 829                 {
 830                         this._line_numbers = lines;
 831                 }
 832
 833                 internal void Write (MonoSymbolFile file, MyBinaryWriter bw, bool readColumnsInfo)
 834                 {
 835                         int start = (int) bw.BaseStream.Position;
 836
 837                         bool last_is_hidden = false;
 838                         int last_line = 1, last_offset = 0, last_file = 1;
 839                         for (int i = 0; i < LineNumbers.Length; i++) {
 840                                 int line_inc = LineNumbers [i].Row - last_line;
 841                                 int offset_inc = LineNumbers [i].Offset - last_offset;
 842
 843                                 if (LineNumbers [i].File != last_file) {
 844                                         bw.Write (DW_LNS_set_file);
 845                                         bw.WriteLeb128 (LineNumbers [i].File);
 846                                         last_file = LineNumbers [i].File;
 847                                 }
 848
 849                                 if (LineNumbers [i].IsHidden != last_is_hidden) {
 850                                         bw.Write ((byte) 0);
 851                                         bw.Write ((byte) 1);
 852                                         bw.Write (DW_LNE_MONO_negate_is_hidden);
 853                                         last_is_hidden = LineNumbers [i].IsHidden;
 854                                 }
 855
 856                                 if (offset_inc >= MaxAddressIncrement) {
 857                                         if (offset_inc < 2 * MaxAddressIncrement) {
 858                                                 bw.Write (DW_LNS_const_add_pc);
 859                                                 offset_inc -= MaxAddressIncrement;
 860                                         } else {
 861                                                 bw.Write (DW_LNS_advance_pc);
 862                                                 bw.WriteLeb128 (offset_inc);
 863                                                 offset_inc = 0;
 864                                         }
 865                                 }
 866
 867                                 if ((line_inc < LineBase) || (line_inc >= LineBase + LineRange)) {
 868                                         bw.Write (DW_LNS_advance_line);
 869                                         bw.WriteLeb128 (line_inc);
 870                                         if (offset_inc != 0) {
 871                                                 bw.Write (DW_LNS_advance_pc);
 872                                                 bw.WriteLeb128 (offset_inc);
 873                                         }
 874                                         bw.Write (DW_LNS_copy);
 875                                 } else {
 876                                         byte opcode;
 877                                         opcode = (byte) (line_inc - LineBase + (LineRange * offset_inc) +
 878                                                          OpcodeBase);
 879                                         bw.Write (opcode);
 880                                 }
 881
 882                                 last_line = LineNumbers [i].Row;
 883                                 last_offset = LineNumbers [i].Offset;
 884                         }
 885
 886                         bw.Write ((byte) 0);
 887                         bw.Write ((byte) 1);
 888                         bw.Write (DW_LNE_end_sequence);
 889
 890                         for (int i = 0; i < LineNumbers.Length; i++) {
 891                                 var ln = LineNumbers [i];
 892                                 if (ln.Row >= 0)
 893                                         bw.WriteLeb128 (ln.Column);
 894                         }
 895
 896                         file.ExtendedLineNumberSize += (int) bw.BaseStream.Position - start;
 897                 }
 898
 899                 internal static LineNumberTable Read (MonoSymbolFile file, MyBinaryReader br, bool readColumnsInfo)
 900                 {
 901                         LineNumberTable lnt = new LineNumberTable (file);
 902                         lnt.DoRead (file, br, readColumnsInfo);
 903                         return lnt;
 904                 }
 905
 906                 void DoRead (MonoSymbolFile file, MyBinaryReader br, bool includesColumns)
 907                 {
 908                         var lines = new List<LineNumberEntry> ();
 909
 910                         bool is_hidden = false, modified = false;
 911                         int stm_line = 1, stm_offset = 0, stm_file = 1;
 912                         while (true) {
 913                                 byte opcode = br.ReadByte ();
 914
 915                                 if (opcode == 0) {
 916                                         byte size = br.ReadByte ();
 917                                         long end_pos = br.BaseStream.Position + size;
 918                                         opcode = br.ReadByte ();
 919
 920                                         if (opcode == DW_LNE_end_sequence) {
 921                                                 if (modified)
 922                                                         lines.Add (new LineNumberEntry (
 923                                                                 stm_file, stm_line, -1, stm_offset, is_hidden));
 924                                                 break;
 925                                         } else if (opcode == DW_LNE_MONO_negate_is_hidden) {
 926                                                 is_hidden = !is_hidden;
 927                                                 modified = true;
 928                                         } else if ((opcode >= DW_LNE_MONO__extensions_start) &&
 929                                                    (opcode <= DW_LNE_MONO__extensions_end)) {
 930                                                 ; // reserved for future extensions
 931                                         } else {
 932                                                 throw new MonoSymbolFileException ("Unknown extended opcode {0:x}", opcode);
 933                                         }
 934
 935                                         br.BaseStream.Position = end_pos;
 936                                         continue;
 937                                 } else if (opcode < OpcodeBase) {
 938                                         switch (opcode) {
 939                                         case DW_LNS_copy:
 940                                                 lines.Add (new LineNumberEntry (
 941                                                         stm_file, stm_line, -1, stm_offset, is_hidden));
 942                                                 modified = false;
 943                                                 break;
 944                                         case DW_LNS_advance_pc:
 945                                                 stm_offset += br.ReadLeb128 ();
 946                                                 modified = true;
 947                                                 break;
 948                                         case DW_LNS_advance_line:
 949                                                 stm_line += br.ReadLeb128 ();
 950                                                 modified = true;
 951                                                 break;
 952                                         case DW_LNS_set_file:
 953                                                 stm_file = br.ReadLeb128 ();
 954                                                 modified = true;
 955                                                 break;
 956                                         case DW_LNS_const_add_pc:
 957                                                 stm_offset += MaxAddressIncrement;
 958                                                 modified = true;
 959                                                 break;
 960                                         default:
 961                                                 throw new MonoSymbolFileException (
 962                                                         "Unknown standard opcode {0:x} in LNT",
 963                                                         opcode);
 964                                         }
 965                                 } else {
 966                                         opcode -= OpcodeBase;
 967
 968                                         stm_offset += opcode / LineRange;
 969                                         stm_line += LineBase + (opcode % LineRange);
 970                                         lines.Add (new LineNumberEntry (
 971                                                 stm_file, stm_line, -1, stm_offset, is_hidden));
 972                                         modified = false;
 973                                 }
 974                         }
 975
 976                         _line_numbers = lines.ToArray ();
 977
 978                         if (includesColumns) {
 979                                 for (int i = 0; i < _line_numbers.Length; ++i) {
 980                                         var ln = _line_numbers[i];
 981                                         if (ln.Row >= 0)
 982                                                 ln.Column = br.ReadLeb128 ();
 983                                 }
 984                         }
 985                 }
 986
 987                 public bool GetMethodBounds (out LineNumberEntry start, out LineNumberEntry end)
 988                 {
 989                         if (_line_numbers.Length > 1) {
 990                                 start = _line_numbers [0];
 991                                 end = _line_numbers [_line_numbers.Length - 1];
 992                                 return true;
 993                         }
 994
 995                         start = LineNumberEntry.Null;
 996                         end = LineNumberEntry.Null;
 997                         return false;
 998                 }
 999         }
1000
1001         public class MethodEntry : IComparable
1002         {
1003                 #region This is actually written to the symbol file
1004                 public readonly int CompileUnitIndex;
1005                 public readonly int Token;
1006                 public readonly int NamespaceID;
1007
1008                 int DataOffset;
1009                 int LocalVariableTableOffset;
1010                 int LineNumberTableOffset;
1011                 int CodeBlockTableOffset;
1012                 int ScopeVariableTableOffset;
1013                 int RealNameOffset;
1014                 Flags flags;
1015                 #endregion
1016
1017                 int index;
1018
1019                 public Flags MethodFlags {
1020                         get { return flags; }
1021                 }
1022
1023                 public readonly CompileUnitEntry CompileUnit;
1024
1025                 LocalVariableEntry[] locals;
1026                 CodeBlockEntry[] code_blocks;
1027                 ScopeVariable[] scope_vars;
1028                 LineNumberTable lnt;
1029                 string real_name;
1030
1031                 public readonly MonoSymbolFile SymbolFile;
1032
1033                 public int Index {
1034                         get { return index; }
1035                         set { index = value; }
1036                 }
1037
1038                 [Flags]
1039                 public enum Flags
1040                 {
1041                         LocalNamesAmbiguous     = 1,
1042                         ColumnsInfoIncluded = 1 << 1
1043                 }
1044
1045                 public const int Size = 12;
1046
1047                 internal MethodEntry (MonoSymbolFile file, MyBinaryReader reader, int index)
1048                 {
1049                         this.SymbolFile = file;
1050                         this.index = index;
1051
1052                         Token = reader.ReadInt32 ();
1053                         DataOffset = reader.ReadInt32 ();
1054                         LineNumberTableOffset = reader.ReadInt32 ();
1055
1056                         long old_pos = reader.BaseStream.Position;
1057                         reader.BaseStream.Position = DataOffset;
1058
1059                         CompileUnitIndex = reader.ReadLeb128 ();
1060                         LocalVariableTableOffset = reader.ReadLeb128 ();
1061                         NamespaceID = reader.ReadLeb128 ();
1062
1063                         CodeBlockTableOffset = reader.ReadLeb128 ();
1064                         ScopeVariableTableOffset = reader.ReadLeb128 ();
1065
1066                         RealNameOffset = reader.ReadLeb128 ();
1067
1068                         flags = (Flags) reader.ReadLeb128 ();
1069
1070                         reader.BaseStream.Position = old_pos;
1071
1072                         CompileUnit = file.GetCompileUnit (CompileUnitIndex);
1073                 }
1074
1075                 internal MethodEntry (MonoSymbolFile file, CompileUnitEntry comp_unit,
1076                                       int token, ScopeVariable[] scope_vars,
1077                                       LocalVariableEntry[] locals, LineNumberEntry[] lines,
1078                                       CodeBlockEntry[] code_blocks, string real_name,
1079                                       Flags flags, int namespace_id)
1080                 {
1081                         this.SymbolFile = file;
1082                         this.real_name = real_name;
1083                         this.locals = locals;
1084                         this.code_blocks = code_blocks;
1085                         this.scope_vars = scope_vars;
1086                         this.flags = flags;
1087
1088                         index = -1;
1089
1090                         Token = token;
1091                         CompileUnitIndex = comp_unit.Index;
1092                         CompileUnit = comp_unit;
1093                         NamespaceID = namespace_id;
1094
1095                         CheckLineNumberTable (lines);
1096                         lnt = new LineNumberTable (file, lines);
1097                         file.NumLineNumbers += lines.Length;
1098
1099                         int num_locals = locals != null ? locals.Length : 0;
1100
1101                         if (num_locals <= 32) {
1102                                 // Most of the time, the O(n^2) factor is actually
1103                                 // less than the cost of allocating the hash table,
1104                                 // 32 is a rough number obtained through some testing.
1105
1106                                 for (int i = 0; i < num_locals; i ++) {
1107                                         string nm = locals [i].Name;
1108
1109                                         for (int j = i + 1; j < num_locals; j ++) {
1110                                                 if (locals [j].Name == nm) {
1111                                                         flags |= Flags.LocalNamesAmbiguous;
1112                                                         goto locals_check_done;
1113                                                 }
1114                                         }
1115                                 }
1116                         locals_check_done :
1117                                 ;
1118                         } else {
1119                                 var local_names = new Dictionary<string, LocalVariableEntry> ();
1120                                 foreach (LocalVariableEntry local in locals) {
1121                                         if (local_names.ContainsKey (local.Name)) {
1122                                                 flags |= Flags.LocalNamesAmbiguous;
1123                                                 break;
1124                                         }
1125                                         local_names.Add (local.Name, local);
1126                                 }
1127                         }
1128                 }
1129
1130                 static void CheckLineNumberTable (LineNumberEntry[] line_numbers)
1131                 {
1132                         int last_offset = -1;
1133                         int last_row = -1;
1134
1135                         if (line_numbers == null)
1136                                 return;
1137
1138                         for (int i = 0; i < line_numbers.Length; i++) {
1139                                 LineNumberEntry line = line_numbers [i];
1140
1141                                 if (line.Equals (LineNumberEntry.Null))
1142                                         throw new MonoSymbolFileException ();
1143
1144                                 if (line.Offset < last_offset)
1145                                         throw new MonoSymbolFileException ();
1146
1147                                 if (line.Offset > last_offset) {
1148                                         last_row = line.Row;
1149                                         last_offset = line.Offset;
1150                                 } else if (line.Row > last_row) {
1151                                         last_row = line.Row;
1152                                 }
1153                         }
1154                 }
1155
1156                 internal void Write (MyBinaryWriter bw)
1157                 {
1158                         if ((index <= 0) || (DataOffset == 0))
1159                                 throw new InvalidOperationException ();
1160
1161                         bw.Write (Token);
1162                         bw.Write (DataOffset);
1163                         bw.Write (LineNumberTableOffset);
1164                 }
1165
1166                 internal void WriteData (MonoSymbolFile file, MyBinaryWriter bw)
1167                 {
1168                         if (index <= 0)
1169                                 throw new InvalidOperationException ();
1170
1171                         LocalVariableTableOffset = (int) bw.BaseStream.Position;
1172                         int num_locals = locals != null ? locals.Length : 0;
1173                         bw.WriteLeb128 (num_locals);
1174                         for (int i = 0; i < num_locals; i++)
1175                                 locals [i].Write (file, bw);
1176                         file.LocalCount += num_locals;
1177
1178                         CodeBlockTableOffset = (int) bw.BaseStream.Position;
1179                         int num_code_blocks = code_blocks != null ? code_blocks.Length : 0;
1180                         bw.WriteLeb128 (num_code_blocks);
1181                         for (int i = 0; i < num_code_blocks; i++)
1182                                 code_blocks [i].Write (bw);
1183
1184                         ScopeVariableTableOffset = (int) bw.BaseStream.Position;
1185                         int num_scope_vars = scope_vars != null ? scope_vars.Length : 0;
1186                         bw.WriteLeb128 (num_scope_vars);
1187                         for (int i = 0; i < num_scope_vars; i++)
1188                                 scope_vars [i].Write (bw);
1189
1190                         if (real_name != null) {
1191                                 RealNameOffset = (int) bw.BaseStream.Position;
1192                                 bw.Write (real_name);
1193                         }
1194
1195                         LineNumberTableOffset = (int) bw.BaseStream.Position;
1196                         lnt.Write (file, bw, (flags & Flags.ColumnsInfoIncluded) != 0);
1197
1198                         DataOffset = (int) bw.BaseStream.Position;
1199
1200                         bw.WriteLeb128 (CompileUnitIndex);
1201                         bw.WriteLeb128 (LocalVariableTableOffset);
1202                         bw.WriteLeb128 (NamespaceID);
1203
1204                         bw.WriteLeb128 (CodeBlockTableOffset);
1205                         bw.WriteLeb128 (ScopeVariableTableOffset);
1206
1207                         bw.WriteLeb128 (RealNameOffset);
1208                         bw.WriteLeb128 ((int) flags);
1209                 }
1210
1211                 public LineNumberTable GetLineNumberTable ()
1212                 {
1213                         lock (SymbolFile) {
1214                                 if (lnt != null)
1215                                         return lnt;
1216
1217                                 if (LineNumberTableOffset == 0)
1218                                         return null;
1219
1220                                 MyBinaryReader reader = SymbolFile.BinaryReader;
1221                                 long old_pos = reader.BaseStream.Position;
1222                                 reader.BaseStream.Position = LineNumberTableOffset;
1223
1224                                 lnt = LineNumberTable.Read (SymbolFile, reader, (flags & Flags.ColumnsInfoIncluded) != 0);
1225
1226                                 reader.BaseStream.Position = old_pos;
1227                                 return lnt;
1228                         }
1229                 }
1230
1231                 public LocalVariableEntry[] GetLocals ()
1232                 {
1233                         lock (SymbolFile) {
1234                                 if (locals != null)
1235                                         return locals;
1236
1237                                 if (LocalVariableTableOffset == 0)
1238                                         return null;
1239
1240                                 MyBinaryReader reader = SymbolFile.BinaryReader;
1241                                 long old_pos = reader.BaseStream.Position;
1242                                 reader.BaseStream.Position = LocalVariableTableOffset;
1243
1244                                 int num_locals = reader.ReadLeb128 ();
1245                                 locals = new LocalVariableEntry [num_locals];
1246
1247                                 for (int i = 0; i < num_locals; i++)
1248                                         locals [i] = new LocalVariableEntry (SymbolFile, reader);
1249
1250                                 reader.BaseStream.Position = old_pos;
1251                                 return locals;
1252                         }
1253                 }
1254
1255                 public CodeBlockEntry[] GetCodeBlocks ()
1256                 {
1257                         lock (SymbolFile) {
1258                                 if (code_blocks != null)
1259                                         return code_blocks;
1260
1261                                 if (CodeBlockTableOffset == 0)
1262                                         return null;
1263
1264                                 MyBinaryReader reader = SymbolFile.BinaryReader;
1265                                 long old_pos = reader.BaseStream.Position;
1266                                 reader.BaseStream.Position = CodeBlockTableOffset;
1267
1268                                 int num_code_blocks = reader.ReadLeb128 ();
1269                                 code_blocks = new CodeBlockEntry [num_code_blocks];
1270
1271                                 for (int i = 0; i < num_code_blocks; i++)
1272                                         code_blocks [i] = new CodeBlockEntry (i, reader);
1273
1274                                 reader.BaseStream.Position = old_pos;
1275                                 return code_blocks;
1276                         }
1277                 }
1278
1279                 public ScopeVariable[] GetScopeVariables ()
1280                 {
1281                         lock (SymbolFile) {
1282                                 if (scope_vars != null)
1283                                         return scope_vars;
1284
1285                                 if (ScopeVariableTableOffset == 0)
1286                                         return null;
1287
1288                                 MyBinaryReader reader = SymbolFile.BinaryReader;
1289                                 long old_pos = reader.BaseStream.Position;
1290                                 reader.BaseStream.Position = ScopeVariableTableOffset;
1291
1292                                 int num_scope_vars = reader.ReadLeb128 ();
1293                                 scope_vars = new ScopeVariable [num_scope_vars];
1294
1295                                 for (int i = 0; i < num_scope_vars; i++)
1296                                         scope_vars [i] = new ScopeVariable (reader);
1297
1298                                 reader.BaseStream.Position = old_pos;
1299                                 return scope_vars;
1300                         }
1301                 }
1302
1303                 public string GetRealName ()
1304                 {
1305                         lock (SymbolFile) {
1306                                 if (real_name != null)
1307                                         return real_name;
1308
1309                                 if (RealNameOffset == 0)
1310                                         return null;
1311
1312                                 real_name = SymbolFile.BinaryReader.ReadString (RealNameOffset);
1313                                 return real_name;
1314                         }
1315                 }
1316
1317                 public int CompareTo (object obj)
1318                 {
1319                         MethodEntry method = (MethodEntry) obj;
1320
1321                         if (method.Token < Token)
1322                                 return 1;
1323                         else if (method.Token > Token)
1324                                 return -1;
1325                         else
1326                                 return 0;
1327                 }
1328
1329                 public override string ToString ()
1330                 {
1331                         return String.Format ("[Method {0}:{1:x}:{2}:{3}]",
1332                                               index, Token, CompileUnitIndex, CompileUnit);
1333                 }
1334         }
1335
1336         public struct NamespaceEntry
1337         {
1338                 #region This is actually written to the symbol file
1339                 public readonly string Name;
1340                 public readonly int Index;
1341                 public readonly int Parent;
1342                 public readonly string[] UsingClauses;
1343                 #endregion
1344
1345                 public NamespaceEntry (string name, int index, string[] using_clauses, int parent)
1346                 {
1347                         this.Name = name;
1348                         this.Index = index;
1349                         this.Parent = parent;
1350                         this.UsingClauses = using_clauses != null ? using_clauses : new string [0];
1351                 }
1352
1353                 internal NamespaceEntry (MonoSymbolFile file, MyBinaryReader reader)
1354                 {
1355                         Name = reader.ReadString ();
1356                         Index = reader.ReadLeb128 ();
1357                         Parent = reader.ReadLeb128 ();
1358
1359                         int count = reader.ReadLeb128 ();
1360                         UsingClauses = new string [count];
1361                         for (int i = 0; i < count; i++)
1362                                 UsingClauses [i] = reader.ReadString ();
1363                 }
1364
1365                 internal void Write (MonoSymbolFile file, MyBinaryWriter bw)
1366                 {
1367                         bw.Write (Name);
1368                         bw.WriteLeb128 (Index);
1369                         bw.WriteLeb128 (Parent);
1370                         bw.WriteLeb128 (UsingClauses.Length);
1371                         foreach (string uc in UsingClauses)
1372                                 bw.Write (uc);
1373                 }
1374
1375                 public override string ToString ()
1376                 {
1377                         return String.Format ("[Namespace {0}:{1}:{2}]", Name, Index, Parent);
1378                 }
1379         }
1380 }