mcs/class/Mono.Cecil/Mono.Cecil/ReflectionReader.cs

   1 //
   2 // ReflectionReader.cs
   3 //
   4 // Author:
   5 //   Jb Evain (jbevain@gmail.com)
   6 //
   7 // (C) 2005 - 2007 Jb Evain
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 namespace Mono.Cecil {
  30
  31         using System;
  32         using System.IO;
  33         using System.Text;
  34
  35         using Mono.Cecil.Binary;
  36         using Mono.Cecil.Cil;
  37         using Mono.Cecil.Metadata;
  38         using Mono.Cecil.Signatures;
  39
  40         internal abstract class ReflectionReader : BaseReflectionReader {
  41
  42                 ModuleDefinition m_module;
  43                 ImageReader m_reader;
  44                 SecurityDeclarationReader m_secReader;
  45                 protected MetadataTableReader m_tableReader;
  46                 protected MetadataRoot m_root;
  47                 protected TablesHeap m_tHeap;
  48                 protected bool m_checkDeleted;
  49
  50                 protected TypeDefinition [] m_typeDefs;
  51                 protected TypeReference [] m_typeRefs;
  52                 protected TypeReference [] m_typeSpecs;
  53                 protected MethodDefinition [] m_meths;
  54                 protected FieldDefinition [] m_fields;
  55                 protected EventDefinition [] m_events;
  56                 protected PropertyDefinition [] m_properties;
  57                 protected MemberReference [] m_memberRefs;
  58                 protected ParameterDefinition [] m_parameters;
  59                 protected GenericParameter [] m_genericParameters;
  60                 protected GenericInstanceMethod [] m_methodSpecs;
  61
  62                 bool m_isCorlib;
  63                 AssemblyNameReference m_corlib;
  64
  65                 protected SignatureReader m_sigReader;
  66                 protected CodeReader m_codeReader;
  67                 protected ISymbolReader m_symbolReader;
  68
  69                 internal AssemblyNameReference Corlib {
  70                         get {
  71                                 if (m_corlib != null)
  72                                         return m_corlib;
  73
  74                                 foreach (AssemblyNameReference ar in m_module.AssemblyReferences) {
  75                                         if (ar.Name == Constants.Corlib) {
  76                                                 m_corlib = ar;
  77                                                 return m_corlib;
  78                                         }
  79                                 }
  80
  81                                 return null;
  82                         }
  83                 }
  84
  85                 public ModuleDefinition Module {
  86                         get { return m_module; }
  87                 }
  88
  89                 public SignatureReader SigReader {
  90                         get { return m_sigReader; }
  91                 }
  92
  93                 public MetadataTableReader TableReader {
  94                         get { return m_tableReader; }
  95                 }
  96
  97                 public CodeReader Code {
  98                         get { return m_codeReader; }
  99                 }
 100
 101                 public ISymbolReader SymbolReader {
 102                         get { return m_symbolReader; }
 103                         set { m_symbolReader = value; }
 104                 }
 105
 106                 public MetadataRoot MetadataRoot {
 107                         get { return m_root; }
 108                 }
 109
 110                 public ReflectionReader (ModuleDefinition module)
 111                 {
 112                         m_module = module;
 113                         m_reader = m_module.ImageReader;
 114                         m_root = m_module.Image.MetadataRoot;
 115                         m_tHeap = m_root.Streams.TablesHeap;
 116                         m_checkDeleted = (m_tHeap.HeapSizes & 0x80) != 0;
 117                         if (m_reader != null)
 118                                 m_tableReader = m_reader.MetadataReader.TableReader;
 119                         m_codeReader = new CodeReader (this);
 120                         m_sigReader = new SignatureReader (m_root, this);
 121                         m_isCorlib = module.Assembly.Name.Name == Constants.Corlib;
 122                 }
 123
 124                 public TypeDefinition GetTypeDefAt (uint rid)
 125                 {
 126                         if (rid > m_typeDefs.Length)
 127                                 return null;
 128
 129                         return m_typeDefs [rid - 1];
 130                 }
 131
 132                 public TypeReference GetTypeRefAt (uint rid)
 133                 {
 134                         if (rid > m_typeRefs.Length)
 135                                 return null;
 136
 137                         return m_typeRefs [rid - 1];
 138                 }
 139
 140                 public TypeReference GetTypeSpecAt (uint rid, GenericContext context)
 141                 {
 142                         if (rid > m_typeSpecs.Length)
 143                                 return null;
 144
 145                         int index = (int) rid - 1;
 146                         TypeReference tspec = m_typeSpecs [index];
 147                         if (tspec != null)
 148                                 return tspec;
 149
 150                         TypeSpecTable tsTable = m_tableReader.GetTypeSpecTable ();
 151                         TypeSpecRow tsRow = tsTable [index];
 152                         TypeSpec ts = m_sigReader.GetTypeSpec (tsRow.Signature);
 153                         tspec = GetTypeRefFromSig (ts.Type, context);
 154                         tspec = GetModifierType (ts.CustomMods, tspec);
 155                         tspec.MetadataToken = MetadataToken.FromMetadataRow (TokenType.TypeSpec, index);
 156                         m_typeSpecs [index] = tspec;
 157
 158                         return tspec;
 159                 }
 160
 161                 public FieldDefinition GetFieldDefAt (uint rid)
 162                 {
 163                         if (rid > m_fields.Length)
 164                                 return null;
 165
 166                         return m_fields [rid - 1];
 167                 }
 168
 169                 public MethodDefinition GetMethodDefAt (uint rid)
 170                 {
 171                         if (rid > m_meths.Length)
 172                                 return null;
 173
 174                         return m_meths [rid - 1];
 175                 }
 176
 177                 protected bool IsDeleted (IMemberDefinition member)
 178                 {
 179                         if (!m_checkDeleted)
 180                                 return false;
 181
 182                         if (!member.IsSpecialName || !member.IsRuntimeSpecialName)
 183                                 return false;
 184
 185                         return member.Name.StartsWith (Constants.Deleted);
 186                 }
 187
 188                 public MemberReference GetMemberRefAt (uint rid, GenericContext context)
 189                 {
 190                         if (rid > m_memberRefs.Length)
 191                                 return null;
 192
 193                         int index = (int) rid - 1;
 194                         MemberReference member = m_memberRefs [index];
 195                         if (member != null)
 196                                 return member;
 197
 198                         MemberRefTable mrTable = m_tableReader.GetMemberRefTable ();
 199                         MemberRefRow mrefRow = mrTable [index];
 200
 201                         Signature sig = m_sigReader.GetMemberRefSig (mrefRow.Class.TokenType, mrefRow.Signature);
 202                         switch (mrefRow.Class.TokenType) {
 203                         case TokenType.TypeDef :
 204                         case TokenType.TypeRef :
 205                         case TokenType.TypeSpec :
 206                                 TypeReference declaringType = GetTypeDefOrRef (mrefRow.Class, context);
 207                                 GenericContext nc = context.Clone ();
 208
 209                                 if (declaringType is GenericInstanceType) {
 210                                         TypeReference ct = declaringType;
 211                                         while (ct is GenericInstanceType)
 212                                                 ct = (ct as GenericInstanceType).ElementType;
 213
 214                                         nc.Type = ct;
 215                                 }
 216
 217                                 if (sig is FieldSig) {
 218                                         FieldSig fs = sig as FieldSig;
 219                                         TypeReference fieldType = GetTypeRefFromSig (fs.Type, nc);
 220                                         fieldType = GetModifierType (fs.CustomMods, fieldType);
 221
 222                                         member = new FieldReference (
 223                                                 m_root.Streams.StringsHeap [mrefRow.Name],
 224                                                 declaringType,
 225                                                 fieldType);
 226                                 } else {
 227                                         string name = m_root.Streams.StringsHeap [mrefRow.Name];
 228                                         MethodSig ms = (MethodSig) sig;
 229
 230                                         member = CreateMethodReferenceFromSig (ms, name, declaringType, nc);
 231                                 }
 232                                 break;
 233                         case TokenType.Method :
 234                                 // really not sure about this
 235                                 MethodDefinition methdef = GetMethodDefAt (mrefRow.Class.RID);
 236
 237                                 member = CreateMethodReferenceFromSig ((MethodSig) sig, methdef.Name, methdef.DeclaringType, new GenericContext ());
 238                                 break;
 239                         case TokenType.ModuleRef :
 240                                 break; // TODO, implement that, or not
 241                         }
 242
 243                         member.MetadataToken = MetadataToken.FromMetadataRow (TokenType.MemberRef, index);
 244                         m_module.MemberReferences.Add (member);
 245                         m_memberRefs [index] = member;
 246
 247                         return member;
 248                 }
 249
 250                 MethodReference CreateMethodReferenceFromSig (MethodSig ms, string name, TypeReference declaringType, GenericContext context)
 251                 {
 252                         MethodReference methref = new MethodReference (
 253                                 name, ms.HasThis, ms.ExplicitThis, ms.MethCallConv);
 254                         methref.DeclaringType = declaringType;
 255
 256                         if (ms is MethodDefSig) {
 257                                 int arity = (ms as MethodDefSig).GenericParameterCount;
 258                                 for (int i = 0; i < arity; i++)
 259                                         methref.GenericParameters.Add (new GenericParameter (i, methref));
 260                         }
 261
 262                         if (methref.GenericParameters.Count > 0)
 263                                 context.Method = methref;
 264
 265                         methref.ReturnType = GetMethodReturnType (ms, context);
 266
 267                         methref.ReturnType.Method = methref;
 268                         for (int j = 0; j < ms.ParamCount; j++) {
 269                                 Param p = ms.Parameters [j];
 270                                 ParameterDefinition pdef = BuildParameterDefinition (j, p, context);
 271                                 pdef.Method = methref;
 272                                 methref.Parameters.Add (pdef);
 273                         }
 274
 275                         CreateSentinelIfNeeded (methref, ms);
 276
 277                         return methref;
 278                 }
 279
 280                 public static void CreateSentinelIfNeeded (IMethodSignature meth, MethodSig signature)
 281                 {
 282                         MethodDefSig sig = signature as MethodDefSig;
 283                         if (sig == null)
 284                                 return;
 285
 286                         int sentinel = sig.Sentinel;
 287
 288                         if (sig.Sentinel < 0 || sig.Sentinel >= meth.Parameters.Count)
 289                                 return;
 290
 291                         ParameterDefinition param = meth.Parameters [sentinel];
 292                         param.ParameterType = new SentinelType (param.ParameterType);
 293                 }
 294
 295                 public PropertyDefinition GetPropertyDefAt (uint rid)
 296                 {
 297                         if (rid > m_properties.Length)
 298                                 return null;
 299
 300                         return m_properties [rid - 1];
 301                 }
 302
 303                 public EventDefinition GetEventDefAt (uint rid)
 304                 {
 305                         if (rid > m_events.Length)
 306                                 return null;
 307
 308                         return m_events [rid - 1];
 309                 }
 310
 311                 public ParameterDefinition GetParamDefAt (uint rid)
 312                 {
 313                         if (rid > m_parameters.Length)
 314                                 return null;
 315
 316                         return m_parameters [rid - 1];
 317                 }
 318
 319                 public GenericParameter GetGenericParameterAt (uint rid)
 320                 {
 321                         if (rid > m_genericParameters.Length)
 322                                 return null;
 323
 324                         return m_genericParameters [rid - 1];
 325                 }
 326
 327                 public GenericInstanceMethod GetMethodSpecAt (uint rid, GenericContext context)
 328                 {
 329                         if (rid > m_methodSpecs.Length)
 330                                 return null;
 331
 332                         int index = (int) rid - 1;
 333                         GenericInstanceMethod gim = m_methodSpecs [index];
 334                         if (gim != null)
 335                                 return gim;
 336
 337                         MethodSpecTable msTable = m_tableReader.GetMethodSpecTable ();
 338                         MethodSpecRow msRow = msTable [index];
 339
 340                         MethodSpec sig = m_sigReader.GetMethodSpec (msRow.Instantiation);
 341
 342                         MethodReference meth;
 343                         if (msRow.Method.TokenType == TokenType.Method)
 344                                 meth = GetMethodDefAt (msRow.Method.RID);
 345                         else if (msRow.Method.TokenType == TokenType.MemberRef)
 346                                 meth = (MethodReference) GetMemberRefAt (msRow.Method.RID, context);
 347                         else
 348                                 throw new ReflectionException ("Unknown method type for method spec");
 349
 350                         gim = new GenericInstanceMethod (meth);
 351                         context.CheckProvider (meth, sig.Signature.Arity);
 352                         foreach (GenericArg arg in sig.Signature.Types)
 353                                 gim.GenericArguments.Add (GetGenericArg (arg, context));
 354
 355                         m_methodSpecs [index] = gim;
 356
 357                         return gim;
 358                 }
 359
 360                 public TypeReference GetTypeDefOrRef (MetadataToken token, GenericContext context)
 361                 {
 362                         if (token.RID == 0)
 363                                 return null;
 364
 365                         switch (token.TokenType) {
 366                         case TokenType.TypeDef :
 367                                 return GetTypeDefAt (token.RID);
 368                         case TokenType.TypeRef :
 369                                 return GetTypeRefAt (token.RID);
 370                         case TokenType.TypeSpec :
 371                                 return GetTypeSpecAt (token.RID, context);
 372                         default :
 373                                 return null;
 374                         }
 375                 }
 376
 377                 public TypeReference SearchCoreType (string fullName)
 378                 {
 379                         if (m_isCorlib)
 380                                 return m_module.Types [fullName];
 381
 382                         TypeReference coreType =  m_module.TypeReferences [fullName];
 383                         if (coreType == null) {
 384                                 string [] parts = fullName.Split ('.');
 385                                 if (parts.Length != 2)
 386                                         throw new ReflectionException ("Unvalid core type name");
 387                                 coreType = new TypeReference (parts [1], parts [0], Corlib);
 388                                 m_module.TypeReferences.Add (coreType);
 389                         }
 390                         if (!coreType.IsValueType) {
 391                                 switch (coreType.FullName) {
 392                                 case Constants.Boolean :
 393                                 case Constants.Char :
 394                                 case Constants.Single :
 395                                 case Constants.Double :
 396                                 case Constants.SByte :
 397                                 case Constants.Byte :
 398                                 case Constants.Int16 :
 399                                 case Constants.UInt16 :
 400                                 case Constants.Int32 :
 401                                 case Constants.UInt32 :
 402                                 case Constants.Int64 :
 403                                 case Constants.UInt64 :
 404                                 case Constants.IntPtr :
 405                                 case Constants.UIntPtr :
 406                                         coreType.IsValueType = true;
 407                                         break;
 408                                 }
 409                         }
 410                         return coreType;
 411                 }
 412
 413                 public IMetadataTokenProvider LookupByToken (MetadataToken token)
 414                 {
 415                         switch (token.TokenType) {
 416                         case TokenType.TypeDef :
 417                                 return GetTypeDefAt (token.RID);
 418                         case TokenType.TypeRef :
 419                                 return GetTypeRefAt (token.RID);
 420                         case TokenType.Method :
 421                                 return GetMethodDefAt (token.RID);
 422                         case TokenType.Field :
 423                                 return GetFieldDefAt (token.RID);
 424                         case TokenType.Event :
 425                                 return GetEventDefAt (token.RID);
 426                         case TokenType.Property :
 427                                 return GetPropertyDefAt (token.RID);
 428                         case TokenType.Param :
 429                                 return GetParamDefAt (token.RID);
 430                         default :
 431                                 throw new NotSupportedException ("Lookup is not allowed on this kind of token");
 432                         }
 433                 }
 434
 435                 public CustomAttribute GetCustomAttribute (MethodReference ctor, byte [] data, bool resolve)
 436                 {
 437                         CustomAttrib sig = m_sigReader.GetCustomAttrib (data, ctor, resolve);
 438                         return BuildCustomAttribute (ctor, data, sig);
 439                 }
 440
 441                 public CustomAttribute GetCustomAttribute (MethodReference ctor, byte [] data)
 442                 {
 443                         return GetCustomAttribute (ctor, data, false);
 444                 }
 445
 446                 public override void VisitModuleDefinition (ModuleDefinition mod)
 447                 {
 448                         VisitTypeDefinitionCollection (mod.Types);
 449                 }
 450
 451                 public override void VisitTypeDefinitionCollection (TypeDefinitionCollection types)
 452                 {
 453                         // type def reading
 454                         TypeDefTable typesTable = m_tableReader.GetTypeDefTable ();
 455                         m_typeDefs = new TypeDefinition [typesTable.Rows.Count];
 456                         for (int i = 0; i < typesTable.Rows.Count; i++) {
 457                                 TypeDefRow type = typesTable [i];
 458                                 TypeDefinition t = new TypeDefinition (
 459                                         m_root.Streams.StringsHeap [type.Name],
 460                                         m_root.Streams.StringsHeap [type.Namespace],
 461                                         type.Flags);
 462                                 t.MetadataToken = MetadataToken.FromMetadataRow (TokenType.TypeDef, i);
 463
 464                                 m_typeDefs [i] = t;
 465                         }
 466
 467                         // nested types
 468                         if (m_tHeap.HasTable (NestedClassTable.RId)) {
 469                                 NestedClassTable nested = m_tableReader.GetNestedClassTable ();
 470                                 for (int i = 0; i < nested.Rows.Count; i++) {
 471                                         NestedClassRow row = nested [i];
 472
 473                                         TypeDefinition parent = GetTypeDefAt (row.EnclosingClass);
 474                                         TypeDefinition child = GetTypeDefAt (row.NestedClass);
 475
 476                                         if (!IsDeleted (child))
 477                                                 parent.NestedTypes.Add (child);
 478                                 }
 479                         }
 480
 481                         foreach (TypeDefinition type in m_typeDefs)
 482                                 if (!IsDeleted (type))
 483                                         types.Add (type);
 484
 485                         // type ref reading
 486                         if (m_tHeap.HasTable (TypeRefTable.RId)) {
 487                                 TypeRefTable typesRef = m_tableReader.GetTypeRefTable ();
 488
 489                                 m_typeRefs = new TypeReference [typesRef.Rows.Count];
 490
 491                                 for (int i = 0; i < typesRef.Rows.Count; i++)
 492                                         AddTypeRef (typesRef, i);
 493                         } else
 494                                 m_typeRefs = new TypeReference [0];
 495
 496                         ReadTypeSpecs ();
 497                         ReadMethodSpecs ();
 498
 499                         ReadMethods ();
 500                         ReadGenericParameters ();
 501
 502                         // set base types
 503                         for (int i = 0; i < typesTable.Rows.Count; i++) {
 504                                 TypeDefRow type = typesTable [i];
 505                                 TypeDefinition child = m_typeDefs [i];
 506                                 child.BaseType = GetTypeDefOrRef (type.Extends, new GenericContext (child));
 507                         }
 508
 509                         CompleteMethods ();
 510                         ReadAllFields ();
 511                         ReadMemberReferences ();
 512                 }
 513
 514                 void AddTypeRef (TypeRefTable typesRef, int i)
 515                 {
 516                         // Check if index has been already added.
 517                         if (m_typeRefs [i] != null)
 518                                 return;
 519
 520                         TypeRefRow type = typesRef [i];
 521                         IMetadataScope scope = null;
 522                         TypeReference parent = null;
 523
 524                         if (type.ResolutionScope.RID != 0) {
 525                                 int rid = (int) type.ResolutionScope.RID - 1;
 526                                 switch (type.ResolutionScope.TokenType) {
 527                                 case TokenType.AssemblyRef:
 528                                         scope = m_module.AssemblyReferences [rid];
 529                                         break;
 530                                 case TokenType.ModuleRef:
 531                                         scope = m_module.ModuleReferences [rid];
 532                                         break;
 533                                 case TokenType.Module:
 534                                         scope = m_module.Assembly.Modules [rid];
 535                                         break;
 536                                 case TokenType.TypeRef:
 537                                         AddTypeRef (typesRef, rid);
 538                                         parent = GetTypeRefAt (type.ResolutionScope.RID);
 539                                         scope = parent.Scope;
 540                                         break;
 541                                 }
 542                         }
 543
 544                         TypeReference t = new TypeReference (
 545                                 m_root.Streams.StringsHeap [type.Name],
 546                                 m_root.Streams.StringsHeap [type.Namespace],
 547                                 scope);
 548                         t.MetadataToken = MetadataToken.FromMetadataRow (TokenType.TypeRef, i);
 549
 550                         if (parent != null)
 551                                 t.DeclaringType = parent;
 552
 553                         m_typeRefs [i] = t;
 554                         m_module.TypeReferences.Add (t);
 555                 }
 556
 557                 void ReadTypeSpecs ()
 558                 {
 559                         if (!m_tHeap.HasTable (TypeSpecTable.RId))
 560                                 return;
 561
 562                         TypeSpecTable tsTable = m_tableReader.GetTypeSpecTable ();
 563                         m_typeSpecs = new TypeReference [tsTable.Rows.Count];
 564                 }
 565
 566                 void ReadMethodSpecs ()
 567                 {
 568                         if (!m_tHeap.HasTable (MethodSpecTable.RId))
 569                                 return;
 570
 571                         MethodSpecTable msTable = m_tableReader.GetMethodSpecTable ();
 572                         m_methodSpecs = new GenericInstanceMethod [msTable.Rows.Count];
 573                 }
 574
 575                 void ReadGenericParameters ()
 576                 {
 577                         if (!m_tHeap.HasTable (GenericParamTable.RId))
 578                                 return;
 579
 580                         GenericParamTable gpTable = m_tableReader.GetGenericParamTable ();
 581                         m_genericParameters = new GenericParameter [gpTable.Rows.Count];
 582                         for (int i = 0; i < gpTable.Rows.Count; i++) {
 583                                 GenericParamRow gpRow = gpTable [i];
 584                                 IGenericParameterProvider owner;
 585                                 if (gpRow.Owner.TokenType == TokenType.Method)
 586                                         owner = GetMethodDefAt (gpRow.Owner.RID);
 587                                 else if (gpRow.Owner.TokenType == TokenType.TypeDef)
 588                                         owner = GetTypeDefAt (gpRow.Owner.RID);
 589                                 else
 590                                         throw new ReflectionException ("Unknown owner type for generic parameter");
 591
 592                                 GenericParameter gp = new GenericParameter (gpRow.Number, owner);
 593                                 gp.Attributes = gpRow.Flags;
 594                                 gp.Name = MetadataRoot.Streams.StringsHeap [gpRow.Name];
 595                                 gp.MetadataToken = MetadataToken.FromMetadataRow (TokenType.GenericParam, i);
 596
 597                                 owner.GenericParameters.Add (gp);
 598                                 m_genericParameters [i] = gp;
 599                         }
 600                 }
 601
 602                 void ReadAllFields ()
 603                 {
 604                         TypeDefTable tdefTable = m_tableReader.GetTypeDefTable ();
 605
 606                         if (!m_tHeap.HasTable (FieldTable.RId)) {
 607                                 m_fields = new FieldDefinition [0];
 608                                 return;
 609                         }
 610
 611                         FieldTable fldTable = m_tableReader.GetFieldTable ();
 612                         m_fields = new FieldDefinition [fldTable.Rows.Count];
 613
 614                         for (int i = 0; i < m_typeDefs.Length; i++) {
 615                                 TypeDefinition dec = m_typeDefs [i];
 616                                 GenericContext context = new GenericContext (dec);
 617
 618                                 int index = i, next;
 619
 620                                 if (index == tdefTable.Rows.Count - 1)
 621                                         next = fldTable.Rows.Count + 1;
 622                                 else
 623                                         next = (int) (tdefTable [index + 1]).FieldList;
 624
 625                                 for (int j = (int) tdefTable [index].FieldList; j < next; j++) {
 626                                         FieldRow frow = fldTable [j - 1];
 627                                         FieldSig fsig = m_sigReader.GetFieldSig (frow.Signature);
 628
 629                                         FieldDefinition fdef = new FieldDefinition (
 630                                                 m_root.Streams.StringsHeap [frow.Name],
 631                                                 GetTypeRefFromSig (fsig.Type, context), frow.Flags);
 632                                         fdef.MetadataToken = MetadataToken.FromMetadataRow (TokenType.Field, j - 1);
 633
 634                                         if (fsig.CustomMods.Length > 0)
 635                                                 fdef.FieldType = GetModifierType (fsig.CustomMods, fdef.FieldType);
 636
 637                                         if (!IsDeleted (fdef))
 638                                                 dec.Fields.Add (fdef);
 639
 640                                         m_fields [j - 1] = fdef;
 641                                 }
 642                         }
 643                 }
 644
 645                 void ReadMethods ()
 646                 {
 647                         if (!m_tHeap.HasTable (MethodTable.RId)) {
 648                                 m_meths = new MethodDefinition [0];
 649                                 return;
 650                         }
 651
 652                         MethodTable mTable = m_tableReader.GetMethodTable ();
 653                         m_meths = new MethodDefinition [mTable.Rows.Count];
 654                         for (int i = 0; i < mTable.Rows.Count; i++) {
 655                                 MethodRow mRow = mTable [i];
 656                                 MethodDefinition meth = new MethodDefinition (
 657                                         m_root.Streams.StringsHeap [mRow.Name],
 658                                         mRow.Flags);
 659                                 meth.RVA = mRow.RVA;
 660                                 meth.ImplAttributes = mRow.ImplFlags;
 661
 662                                 meth.MetadataToken = MetadataToken.FromMetadataRow (TokenType.Method, i);
 663
 664                                 m_meths [i] = meth;
 665                         }
 666                 }
 667
 668                 void CompleteMethods ()
 669                 {
 670                         TypeDefTable tdefTable = m_tableReader.GetTypeDefTable ();
 671
 672                         if (!m_tHeap.HasTable (MethodTable.RId)) {
 673                                 m_meths = new MethodDefinition [0];
 674                                 return;
 675                         }
 676
 677                         MethodTable methTable = m_tableReader.GetMethodTable ();
 678                         ParamTable paramTable = m_tableReader.GetParamTable ();
 679                         if (!m_tHeap.HasTable (ParamTable.RId))
 680                                 m_parameters = new ParameterDefinition [0];
 681                         else
 682                                 m_parameters = new ParameterDefinition [paramTable.Rows.Count];
 683
 684                         for (int i = 0; i < m_typeDefs.Length; i++) {
 685                                 TypeDefinition dec = m_typeDefs [i];
 686
 687                                 int index = i, next;
 688
 689                                 if (index == tdefTable.Rows.Count - 1)
 690                                         next = methTable.Rows.Count + 1;
 691                                 else
 692                                         next = (int) (tdefTable [index + 1]).MethodList;
 693
 694                                 for (int j = (int) tdefTable [index].MethodList; j < next; j++) {
 695                                         MethodRow methRow = methTable [j - 1];
 696                                         MethodDefinition mdef = m_meths [j - 1];
 697
 698                                         if (!IsDeleted (mdef)) {
 699                                                 if (mdef.IsConstructor)
 700                                                         dec.Constructors.Add (mdef);
 701                                                 else
 702                                                         dec.Methods.Add (mdef);
 703                                         }
 704
 705                                         GenericContext context = new GenericContext (mdef);
 706
 707                                         MethodDefSig msig = m_sigReader.GetMethodDefSig (methRow.Signature);
 708                                         mdef.HasThis = msig.HasThis;
 709                                         mdef.ExplicitThis = msig.ExplicitThis;
 710                                         mdef.CallingConvention = msig.MethCallConv;
 711
 712                                         int prms;
 713                                         if (j == methTable.Rows.Count)
 714                                                 prms = m_parameters.Length + 1;
 715                                         else
 716                                                 prms = (int) (methTable [j]).ParamList;
 717
 718                                         ParameterDefinition retparam = null;
 719
 720                                         //TODO: optimize this
 721                                         int start = (int) methRow.ParamList - 1;
 722
 723                                         if (paramTable != null && start < prms - 1) {
 724
 725                                                 ParamRow pRetRow = paramTable [start];
 726
 727                                                 if (pRetRow != null && pRetRow.Sequence == 0) { // ret type
 728
 729                                                         retparam = new ParameterDefinition (
 730                                                                 m_root.Streams.StringsHeap [pRetRow.Name],
 731                                                                 0,
 732                                                                 pRetRow.Flags,
 733                                                                 null);
 734
 735                                                         retparam.Method = mdef;
 736                                                         m_parameters [start] = retparam;
 737                                                         start++;
 738                                                 }
 739                                         }
 740
 741                                         for (int k = 0; k < msig.ParamCount; k++) {
 742
 743                                                 int pointer = start + k;
 744
 745                                                 ParamRow pRow = null;
 746
 747                                                 if (paramTable != null && pointer < prms - 1)
 748                                                         pRow = paramTable [pointer];
 749
 750                                                 Param psig = msig.Parameters [k];
 751
 752                                                 ParameterDefinition pdef;
 753                                                 if (pRow != null) {
 754                                                         pdef = BuildParameterDefinition (
 755                                                                 m_root.Streams.StringsHeap [pRow.Name],
 756                                                                 pRow.Sequence, pRow.Flags, psig, context);
 757                                                         pdef.MetadataToken = MetadataToken.FromMetadataRow (TokenType.Param, pointer);
 758                                                         m_parameters [pointer] = pdef;
 759                                                 } else
 760                                                         pdef = BuildParameterDefinition (k + 1, psig, context);
 761
 762                                                 pdef.Method = mdef;
 763                                                 mdef.Parameters.Add (pdef);
 764                                         }
 765
 766                                         mdef.ReturnType = GetMethodReturnType (msig, context);
 767                                         MethodReturnType mrt = mdef.ReturnType;
 768                                         mrt.Method = mdef;
 769                                         if (retparam != null) {
 770                                                 mrt.Parameter = retparam;
 771                                                 mrt.Parameter.ParameterType = mrt.ReturnType;
 772                                         }
 773                                 }
 774                         }
 775
 776                         uint eprid = CodeReader.GetRid ((int) m_reader.Image.CLIHeader.EntryPointToken);
 777                         if (eprid > 0 && eprid <= m_meths.Length)
 778                                 m_module.Assembly.EntryPoint = GetMethodDefAt (eprid);
 779                 }
 780
 781                 void ReadMemberReferences ()
 782                 {
 783                         if (!m_tHeap.HasTable (MemberRefTable.RId))
 784                                 return;
 785
 786                         MemberRefTable mrefTable = m_tableReader.GetMemberRefTable ();
 787                         m_memberRefs = new MemberReference [mrefTable.Rows.Count];
 788                 }
 789
 790                 public override void VisitExternTypeCollection (ExternTypeCollection externs)
 791                 {
 792                         ExternTypeCollection ext = externs;
 793
 794                         if (!m_tHeap.HasTable (ExportedTypeTable.RId))
 795                                 return;
 796
 797                         ExportedTypeTable etTable = m_tableReader.GetExportedTypeTable ();
 798                         TypeReference [] buffer = new TypeReference [etTable.Rows.Count];
 799
 800                         for (int i = 0; i < etTable.Rows.Count; i++) {
 801                                 ExportedTypeRow etRow = etTable [i];
 802                                 if (etRow.Implementation.TokenType != TokenType.File)
 803                                         continue;
 804
 805                                 string name = m_root.Streams.StringsHeap [etRow.TypeName];
 806                                 string ns = m_root.Streams.StringsHeap [etRow.TypeNamespace];
 807                                 if (ns.Length == 0)
 808                                         buffer [i] = m_module.TypeReferences [name];
 809                                 else
 810                                         buffer [i] = m_module.TypeReferences [string.Concat (ns, '.', name)];
 811                         }
 812
 813                         for (int i = 0; i < etTable.Rows.Count; i++) {
 814                                 ExportedTypeRow etRow = etTable [i];
 815                                 if (etRow.Implementation.TokenType != TokenType.ExportedType)
 816                                         continue;
 817
 818                                 TypeReference owner = buffer [etRow.Implementation.RID - 1];
 819                                 string name = m_root.Streams.StringsHeap [etRow.TypeName];
 820                                 buffer [i] = m_module.TypeReferences [string.Concat (owner.FullName, '/', name)];
 821                         }
 822
 823                         for (int i = 0; i < buffer.Length; i++) {
 824                                 TypeReference curs = buffer [i];
 825                                 if (curs != null)
 826                                         ext.Add (curs);
 827                         }
 828                 }
 829
 830                 static object GetFixedArgValue (CustomAttrib.FixedArg fa)
 831                 {
 832                         if (fa.SzArray) {
 833                                 object [] vals = new object [fa.NumElem];
 834                                 for (int j = 0; j < vals.Length; j++)
 835                                         vals [j] = fa.Elems [j].Value;
 836                                 return vals;
 837                         } else
 838                                 return fa.Elems [0].Value;
 839                 }
 840
 841                 TypeReference GetFixedArgType (CustomAttrib.FixedArg fa)
 842                 {
 843                         if (fa.SzArray) {
 844                                 if (fa.NumElem == 0)
 845                                         return new ArrayType (SearchCoreType (Constants.Object));
 846                                 else
 847                                         return new ArrayType (fa.Elems [0].ElemType);
 848                         } else
 849                                 return fa.Elems [0].ElemType;
 850                 }
 851
 852                 TypeReference GetNamedArgType (CustomAttrib.NamedArg na)
 853                 {
 854                         if (na.FieldOrPropType == ElementType.Boxed)
 855                                 return SearchCoreType (Constants.Object);
 856
 857                         return GetFixedArgType (na.FixedArg);
 858                 }
 859
 860                 protected CustomAttribute BuildCustomAttribute (MethodReference ctor, byte [] data, CustomAttrib sig)
 861                 {
 862                         CustomAttribute cattr = new CustomAttribute (ctor);
 863                         if (!sig.Read) {
 864                                 cattr.Resolved = false;
 865                                 cattr.Blob = data;
 866                                 return cattr;
 867                         }
 868
 869                         foreach (CustomAttrib.FixedArg fa in sig.FixedArgs)
 870                                 cattr.ConstructorParameters.Add (GetFixedArgValue (fa));
 871
 872                         foreach (CustomAttrib.NamedArg na in sig.NamedArgs) {
 873                                 object value = GetFixedArgValue (na.FixedArg);
 874                                 if (na.Field) {
 875                                         cattr.Fields [na.FieldOrPropName] = value;
 876                                         cattr.SetFieldType (na.FieldOrPropName, GetNamedArgType (na));
 877                                 } else if (na.Property) {
 878                                         cattr.Properties [na.FieldOrPropName] = value;
 879                                         cattr.SetPropertyType (na.FieldOrPropName, GetNamedArgType (na));
 880                                 } else
 881                                         throw new ReflectionException ("Non valid named arg");
 882                         }
 883
 884                         return cattr;
 885                 }
 886
 887                 void CompleteParameter (ParameterDefinition parameter, Param signature, GenericContext context)
 888                 {
 889                         TypeReference paramType;
 890
 891                         if (signature.TypedByRef)
 892                                 paramType = SearchCoreType (Constants.TypedReference);
 893                         else
 894                                 paramType = GetTypeRefFromSig (signature.Type, context);
 895
 896                         paramType = GetModifierType (signature.CustomMods, paramType);
 897
 898                         if (signature.ByRef)
 899                                 paramType = new ReferenceType (paramType);
 900
 901                         parameter.ParameterType = paramType;
 902                 }
 903
 904                 public ParameterDefinition BuildParameterDefinition (int sequence, Param psig, GenericContext context)
 905                 {
 906                         ParameterDefinition parameter = new ParameterDefinition (null);
 907                         parameter.Sequence = sequence;
 908
 909                         CompleteParameter (parameter, psig, context);
 910
 911                         return parameter;
 912                 }
 913
 914                 public ParameterDefinition BuildParameterDefinition (string name, int sequence, ParameterAttributes attrs, Param psig, GenericContext context)
 915                 {
 916                         ParameterDefinition parameter = new ParameterDefinition (name, sequence, attrs, null);
 917
 918                         CompleteParameter (parameter, psig, context);
 919
 920                         return parameter;
 921                 }
 922
 923                 protected SecurityDeclaration BuildSecurityDeclaration (DeclSecurityRow dsRow)
 924                 {
 925                         return BuildSecurityDeclaration (dsRow.Action, m_root.Streams.BlobHeap.Read (dsRow.PermissionSet));
 926                 }
 927
 928                 public SecurityDeclaration BuildSecurityDeclaration (SecurityAction action, byte [] permset)
 929                 {
 930                         if (m_secReader == null)
 931                                 m_secReader = new SecurityDeclarationReader (m_root, this);
 932
 933                         return m_secReader.FromByteArray (action, permset);
 934                 }
 935
 936                 protected MarshalSpec BuildMarshalDesc (MarshalSig ms, IHasMarshalSpec container)
 937                 {
 938                         if (ms.Spec is MarshalSig.Array) {
 939                                 ArrayMarshalSpec amd = new ArrayMarshalSpec (container);
 940                                 MarshalSig.Array ar = (MarshalSig.Array) ms.Spec;
 941                                 amd.ElemType = ar.ArrayElemType;
 942                                 amd.NumElem = ar.NumElem;
 943                                 amd.ParamNum = ar.ParamNum;
 944                                 amd.ElemMult = ar.ElemMult;
 945                                 return amd;
 946                         } else if (ms.Spec is MarshalSig.CustomMarshaler) {
 947                                 CustomMarshalerSpec cmd = new CustomMarshalerSpec (container);
 948                                 MarshalSig.CustomMarshaler cmsig = (MarshalSig.CustomMarshaler) ms.Spec;
 949                                 cmd.Guid = cmsig.Guid.Length > 0 ? new Guid (cmsig.Guid) : new Guid ();
 950                                 cmd.UnmanagedType = cmsig.UnmanagedType;
 951                                 cmd.ManagedType = cmsig.ManagedType;
 952                                 cmd.Cookie = cmsig.Cookie;
 953                                 return cmd;
 954                         } else if (ms.Spec is MarshalSig.FixedArray) {
 955                                 FixedArraySpec fad = new FixedArraySpec (container);
 956                                 MarshalSig.FixedArray fasig = (MarshalSig.FixedArray) ms.Spec;
 957                                 fad.ElemType = fasig.ArrayElemType;
 958                                 fad.NumElem = fasig.NumElem;
 959                                 return fad;
 960                         } else if (ms.Spec is MarshalSig.FixedSysString) {
 961                                 FixedSysStringSpec fssc = new FixedSysStringSpec (container);
 962                                 fssc.Size = ((MarshalSig.FixedSysString) ms.Spec).Size;
 963                                 return fssc;
 964                         } else if (ms.Spec is MarshalSig.SafeArray) {
 965                                 SafeArraySpec sad = new SafeArraySpec (container);
 966                                 sad.ElemType = ((MarshalSig.SafeArray) ms.Spec).ArrayElemType;
 967                                 return sad;
 968                         } else {
 969                                 return new MarshalSpec (ms.NativeInstrinsic, container);
 970                         }
 971                 }
 972
 973                 public TypeReference GetModifierType (CustomMod [] cmods, TypeReference type)
 974                 {
 975                         if (cmods == null || cmods.Length == 0)
 976                                 return type;
 977
 978                         TypeReference ret = type;
 979                         for (int i = cmods.Length - 1; i >= 0; i--) {
 980                                 CustomMod cmod = cmods [i];
 981                                 TypeReference modType;
 982
 983                                 if (cmod.TypeDefOrRef.RID == 0)
 984                                         continue;
 985
 986                                 if (cmod.TypeDefOrRef.TokenType == TokenType.TypeDef)
 987                                         modType = GetTypeDefAt (cmod.TypeDefOrRef.RID);
 988                                 else
 989                                         modType = GetTypeRefAt (cmod.TypeDefOrRef.RID);
 990
 991                                 if (cmod.CMOD == CustomMod.CMODType.OPT)
 992                                         ret = new ModifierOptional (ret, modType);
 993                                 else if (cmod.CMOD == CustomMod.CMODType.REQD)
 994                                         ret = new ModifierRequired (ret, modType);
 995                         }
 996                         return ret;
 997                 }
 998
 999                 public MethodReturnType GetMethodReturnType (MethodSig msig, GenericContext context)
1000                 {
1001                         TypeReference retType;
1002                         if (msig.RetType.Void)
1003                                 retType = SearchCoreType (Constants.Void);
1004                         else if (msig.RetType.TypedByRef)
1005                                 retType = SearchCoreType (Constants.TypedReference);
1006                         else
1007                                 retType = GetTypeRefFromSig (msig.RetType.Type, context);
1008
1009                         retType = GetModifierType (msig.RetType.CustomMods, retType);
1010
1011                         if (msig.RetType.ByRef)
1012                                 retType = new ReferenceType (retType);
1013
1014                         return new MethodReturnType (retType);
1015                 }
1016
1017                 public TypeReference GetTypeRefFromSig (SigType t, GenericContext context)
1018                 {
1019                         switch (t.ElementType) {
1020                         case ElementType.Class :
1021                                 CLASS c = t as CLASS;
1022                                 return GetTypeDefOrRef (c.Type, context);
1023                         case ElementType.ValueType :
1024                                 VALUETYPE vt = t as VALUETYPE;
1025                                 TypeReference vtr = GetTypeDefOrRef (vt.Type, context);
1026                                 vtr.IsValueType = true;
1027                                 return vtr;
1028                         case ElementType.String :
1029                                 return SearchCoreType (Constants.String);
1030                         case ElementType.Object :
1031                                 return SearchCoreType (Constants.Object);
1032                         case ElementType.Void :
1033                                 return SearchCoreType (Constants.Void);
1034                         case ElementType.Boolean :
1035                                 return SearchCoreType (Constants.Boolean);
1036                         case ElementType.Char :
1037                                 return SearchCoreType (Constants.Char);
1038                         case ElementType.I1 :
1039                                 return SearchCoreType (Constants.SByte);
1040                         case ElementType.U1 :
1041                                 return SearchCoreType (Constants.Byte);
1042                         case ElementType.I2 :
1043                                 return SearchCoreType (Constants.Int16);
1044                         case ElementType.U2 :
1045                                 return SearchCoreType (Constants.UInt16);
1046                         case ElementType.I4 :
1047                                 return SearchCoreType (Constants.Int32);
1048                         case ElementType.U4 :
1049                                 return SearchCoreType (Constants.UInt32);
1050                         case ElementType.I8 :
1051                                 return SearchCoreType (Constants.Int64);
1052                         case ElementType.U8 :
1053                                 return SearchCoreType (Constants.UInt64);
1054                         case ElementType.R4 :
1055                                 return SearchCoreType (Constants.Single);
1056                         case ElementType.R8 :
1057                                 return SearchCoreType (Constants.Double);
1058                         case ElementType.I :
1059                                 return SearchCoreType (Constants.IntPtr);
1060                         case ElementType.U :
1061                                 return SearchCoreType (Constants.UIntPtr);
1062                         case ElementType.TypedByRef :
1063                                 return SearchCoreType (Constants.TypedReference);
1064                         case ElementType.Array :
1065                                 ARRAY ary = t as ARRAY;
1066                                 return new ArrayType (GetTypeRefFromSig (ary.Type, context), ary.Shape);
1067                         case ElementType.SzArray :
1068                                 SZARRAY szary = t as SZARRAY;
1069                                 ArrayType at = new ArrayType (GetTypeRefFromSig (szary.Type, context));
1070                                 return at;
1071                         case ElementType.Ptr :
1072                                 PTR pointer = t as PTR;
1073                                 if (pointer.Void)
1074                                         return new PointerType (SearchCoreType (Constants.Void));
1075                                 return new PointerType (GetTypeRefFromSig (pointer.PtrType, context));
1076                         case ElementType.FnPtr :
1077                                 FNPTR funcptr = t as FNPTR;
1078                                 FunctionPointerType fnptr = new FunctionPointerType (funcptr.Method.HasThis, funcptr.Method.ExplicitThis,
1079                                         funcptr.Method.MethCallConv, GetMethodReturnType (funcptr.Method, context));
1080
1081                                 for (int i = 0; i < funcptr.Method.ParamCount; i++) {
1082                                         Param p = funcptr.Method.Parameters [i];
1083                                         fnptr.Parameters.Add (BuildParameterDefinition (i, p, context));
1084                                 }
1085
1086                                 CreateSentinelIfNeeded (fnptr, funcptr.Method);
1087
1088                                 return fnptr;
1089                         case ElementType.Var:
1090                                 VAR var = t as VAR;
1091                                 context.CheckProvider (context.Type, var.Index + 1);
1092
1093                                 if (context.Type is GenericInstanceType)
1094                                         return (context.Type as GenericInstanceType).GenericArguments [var.Index];
1095                                 else
1096                                         return context.Type.GenericParameters [var.Index];
1097                         case ElementType.MVar:
1098                                 MVAR mvar = t as MVAR;
1099                                 context.CheckProvider (context.Method, mvar.Index + 1);
1100
1101                                 if (context.Method is GenericInstanceMethod)
1102                                         return (context.Method as GenericInstanceMethod).GenericArguments [mvar.Index];
1103                                 else
1104                                         return context.Method.GenericParameters [mvar.Index];
1105                         case ElementType.GenericInst:
1106                                 GENERICINST ginst = t as GENERICINST;
1107                                 GenericInstanceType instance = new GenericInstanceType (GetTypeDefOrRef (ginst.Type, context));
1108                                 instance.IsValueType = ginst.ValueType;
1109                                 context.CheckProvider (instance.GetOriginalType (), ginst.Signature.Arity);
1110
1111                                 for (int i = 0; i < ginst.Signature.Arity; i++)
1112                                         instance.GenericArguments.Add (GetGenericArg (
1113                                                 ginst.Signature.Types [i], context));
1114
1115                                 return instance;
1116                         default:
1117                                 break;
1118                         }
1119                         return null;
1120                 }
1121
1122                 TypeReference GetGenericArg (GenericArg arg, GenericContext context)
1123                 {
1124                         TypeReference type = GetTypeRefFromSig (arg.Type, context);
1125                         type = GetModifierType (arg.CustomMods, type);
1126                         return type;
1127                 }
1128
1129                 static bool IsOdd (int i)
1130                 {
1131                         return (i & 1) == 1;
1132                 }
1133
1134                 protected object GetConstant (uint pos, ElementType elemType)
1135                 {
1136                         if (elemType == ElementType.Class)
1137                                 return null;
1138
1139                         byte [] constant = m_root.Streams.BlobHeap.Read (pos);
1140
1141                         if (elemType == ElementType.String) {
1142                                 int length = constant.Length;
1143                                 if (IsOdd (length))
1144                                         length--;
1145
1146                                 return Encoding.Unicode.GetString (constant, 0, length);
1147                         }
1148
1149                         // One byte types can always be read using BitConverter. However it can't be used
1150                         // elsewhere since it behaves differently in Mono compared to CF on BE architectures
1151                         switch (elemType) {
1152                         case ElementType.Boolean :
1153                                 return BitConverter.ToBoolean (constant, 0);
1154                         case ElementType.I1 :
1155                                 return (sbyte) constant [0];
1156                         case ElementType.U1 :
1157                                 return (byte) constant [0];
1158                         case ElementType.Object: // illegal, but foundable
1159                                 return null;
1160                         default :
1161                                 if (BitConverter.IsLittleEndian)
1162                                         return GetConstantLittleEndian (elemType, constant);
1163                                 else
1164                                         return GetConstantBigEndian (elemType, constant);
1165                         }
1166                 }
1167
1168                 static object GetConstantLittleEndian (ElementType elemType, byte [] constant)
1169                 {
1170                         switch (elemType) {
1171                         case ElementType.Char :
1172                                 return BitConverter.ToChar (constant, 0);
1173                         case ElementType.I2 :
1174                                 return BitConverter.ToInt16 (constant, 0);
1175                         case ElementType.I4 :
1176                                 return BitConverter.ToInt32 (constant, 0);
1177                         case ElementType.I8 :
1178                                 return BitConverter.ToInt64 (constant, 0);
1179                         case ElementType.U2 :
1180                                 return BitConverter.ToUInt16 (constant, 0);
1181                         case ElementType.U4 :
1182                                 return BitConverter.ToUInt32 (constant, 0);
1183                         case ElementType.U8 :
1184                                 return BitConverter.ToUInt64 (constant, 0);
1185                         case ElementType.R4 :
1186                                 return BitConverter.ToSingle (constant, 0);
1187                         case ElementType.R8 :
1188                                 return BitConverter.ToDouble (constant, 0);
1189                         default:
1190                                 throw new ReflectionException ("Non valid element in constant table");
1191                         }
1192                 }
1193
1194                 static object GetConstantBigEndian (ElementType elemType, byte [] constant)
1195                 {
1196                         // BinaryReader always read it's data in LE format
1197                         // note: this could be further optimized (even without unsafe code)
1198                         BinaryReader br = new BinaryReader (new MemoryStream (constant));
1199                         switch (elemType) {
1200                         case ElementType.Char :
1201                                 return (char) br.ReadUInt16 ();
1202                         case ElementType.I2 :
1203                                 return br.ReadInt16 ();
1204                         case ElementType.I4 :
1205                                 return br.ReadInt32 ();
1206                         case ElementType.I8 :
1207                                 return br.ReadInt64 ();
1208                         case ElementType.U2 :
1209                                 return br.ReadUInt16 ();
1210                         case ElementType.U4 :
1211                                 return br.ReadUInt32 ();
1212                         case ElementType.U8 :
1213                                 return br.ReadUInt64 ();
1214                         case ElementType.R4 :
1215                                 return br.ReadSingle ();
1216                         case ElementType.R8 :
1217                                 return br.ReadDouble ();
1218                         default:
1219                                 throw new ReflectionException ("Non valid element in constant table");
1220                         }
1221                 }
1222
1223                 protected void SetInitialValue (FieldDefinition field)
1224                 {
1225                         int size = 0;
1226                         TypeReference fieldType = field.FieldType;
1227                         switch (fieldType.FullName) {
1228                         case Constants.Boolean:
1229                         case Constants.Byte:
1230                         case Constants.SByte:
1231                                 size = 1;
1232                                 break;
1233                         case Constants.Int16:
1234                         case Constants.UInt16:
1235                         case Constants.Char:
1236                                 size = 2;
1237                                 break;
1238                         case Constants.Int32:
1239                         case Constants.UInt32:
1240                         case Constants.Single:
1241                                 size = 4;
1242                                 break;
1243                         case Constants.Int64:
1244                         case Constants.UInt64:
1245                         case Constants.Double:
1246                                 size = 8;
1247                                 break;
1248                         default:
1249                                 fieldType = fieldType.GetOriginalType ();
1250
1251                                 TypeDefinition fieldTypeDef = fieldType as TypeDefinition;
1252
1253                                 if (fieldTypeDef != null)
1254                                         size = (int) fieldTypeDef.ClassSize;
1255                                 break;
1256                         }
1257
1258                         if (size > 0 && field.RVA != RVA.Zero) {
1259                                 byte [] data = new byte [size];
1260                                 Section sect = m_reader.Image.GetSectionAtVirtualAddress (field.RVA);
1261                                 if (sect != null)
1262                                         Buffer.BlockCopy (sect.Data, (int) (long) (field.RVA - sect.VirtualAddress), data, 0, size);
1263                                 field.InitialValue = data;
1264                         } else
1265                                 field.InitialValue = new byte [0];
1266                 }
1267         }
1268 }