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
 147                         TypeSpecTable tsTable = m_tableReader.GetTypeSpecTable ();
 148                         TypeSpecRow tsRow = tsTable [index];
 149                         TypeSpec ts = m_sigReader.GetTypeSpec (tsRow.Signature);
 150
 151                         // don't cache generic instances
 152                         if (ts.Type.ElementType == ElementType.GenericInst)
 153                                 return CreateTypeSpecFromSig (ts, index, context);
 154
 155                         TypeReference tspec = m_typeSpecs [index];
 156                         if (tspec != null)
 157                                 return tspec;
 158
 159                         tspec = CreateTypeSpecFromSig (ts, index, context);
 160                         m_typeSpecs [index] = tspec;
 161
 162                         return tspec;
 163                 }
 164
 165                 TypeReference CreateTypeSpecFromSig (TypeSpec ts, int index, GenericContext context)
 166                 {
 167                         TypeReference tspec = GetTypeRefFromSig (ts.Type, context);
 168                         tspec = GetModifierType (ts.CustomMods, tspec);
 169                         tspec.MetadataToken = MetadataToken.FromMetadataRow (TokenType.TypeSpec, index);
 170                         return tspec;
 171                 }
 172
 173                 public FieldDefinition GetFieldDefAt (uint rid)
 174                 {
 175                         if (rid > m_fields.Length)
 176                                 return null;
 177
 178                         return m_fields [rid - 1];
 179                 }
 180
 181                 public MethodDefinition GetMethodDefAt (uint rid)
 182                 {
 183                         if (rid > m_meths.Length)
 184                                 return null;
 185
 186                         return m_meths [rid - 1];
 187                 }
 188
 189                 protected bool IsDeleted (IMemberDefinition member)
 190                 {
 191                         if (!m_checkDeleted)
 192                                 return false;
 193
 194                         if (!member.IsSpecialName || !member.IsRuntimeSpecialName)
 195                                 return false;
 196
 197                         return member.Name.StartsWith (Constants.Deleted);
 198                 }
 199
 200                 public MemberReference GetMemberRefAt (uint rid, GenericContext context)
 201                 {
 202                         if (rid > m_memberRefs.Length)
 203                                 return null;
 204
 205                         int index = (int) rid - 1;
 206                         MemberReference member = m_memberRefs [index];
 207                         if (member != null)
 208                                 return member;
 209
 210                         MemberRefTable mrTable = m_tableReader.GetMemberRefTable ();
 211                         MemberRefRow mrefRow = mrTable [index];
 212
 213                         Signature sig = m_sigReader.GetMemberRefSig (mrefRow.Class.TokenType, mrefRow.Signature);
 214                         switch (mrefRow.Class.TokenType) {
 215                         case TokenType.TypeDef :
 216                         case TokenType.TypeRef :
 217                         case TokenType.TypeSpec :
 218                                 TypeReference declaringType = GetTypeDefOrRef (mrefRow.Class, context);
 219                                 GenericContext nc = context.Clone ();
 220
 221                                 if (declaringType is GenericInstanceType) {
 222                                         TypeReference ct = declaringType;
 223                                         while (ct is GenericInstanceType)
 224                                                 ct = (ct as GenericInstanceType).ElementType;
 225
 226                                         nc.Type = ct;
 227                                 }
 228
 229                                 if (sig is FieldSig) {
 230                                         FieldSig fs = sig as FieldSig;
 231                                         TypeReference fieldType = GetTypeRefFromSig (fs.Type, nc);
 232                                         fieldType = GetModifierType (fs.CustomMods, fieldType);
 233
 234                                         member = new FieldReference (
 235                                                 m_root.Streams.StringsHeap [mrefRow.Name],
 236                                                 declaringType,
 237                                                 fieldType);
 238                                 } else {
 239                                         string name = m_root.Streams.StringsHeap [mrefRow.Name];
 240                                         MethodSig ms = (MethodSig) sig;
 241
 242                                         member = CreateMethodReferenceFromSig (ms, name, declaringType, nc);
 243                                 }
 244                                 break;
 245                         case TokenType.Method :
 246                                 // really not sure about this
 247                                 MethodDefinition methdef = GetMethodDefAt (mrefRow.Class.RID);
 248
 249                                 member = CreateMethodReferenceFromSig ((MethodSig) sig, methdef.Name, methdef.DeclaringType, new GenericContext ());
 250                                 break;
 251                         case TokenType.ModuleRef :
 252                                 break; // TODO, implement that, or not
 253                         }
 254
 255                         member.MetadataToken = MetadataToken.FromMetadataRow (TokenType.MemberRef, index);
 256                         m_module.MemberReferences.Add (member);
 257                         m_memberRefs [index] = member;
 258
 259                         return member;
 260                 }
 261
 262                 MethodReference CreateMethodReferenceFromSig (MethodSig ms, string name, TypeReference declaringType, GenericContext context)
 263                 {
 264                         MethodReference methref = new MethodReference (
 265                                 name, ms.HasThis, ms.ExplicitThis, ms.MethCallConv);
 266                         methref.DeclaringType = declaringType;
 267
 268                         if (ms is MethodDefSig) {
 269                                 int arity = (ms as MethodDefSig).GenericParameterCount;
 270                                 for (int i = 0; i < arity; i++)
 271                                         methref.GenericParameters.Add (new GenericParameter (i, methref));
 272                         }
 273
 274                         if (methref.GenericParameters.Count > 0)
 275                                 context.Method = methref;
 276
 277                         methref.ReturnType = GetMethodReturnType (ms, context);
 278
 279                         methref.ReturnType.Method = methref;
 280                         for (int j = 0; j < ms.ParamCount; j++) {
 281                                 Param p = ms.Parameters [j];
 282                                 ParameterDefinition pdef = BuildParameterDefinition (j, p, context);
 283                                 pdef.Method = methref;
 284                                 methref.Parameters.Add (pdef);
 285                         }
 286
 287                         CreateSentinelIfNeeded (methref, ms);
 288
 289                         return methref;
 290                 }
 291
 292                 public static void CreateSentinelIfNeeded (IMethodSignature meth, MethodSig signature)
 293                 {
 294                         MethodDefSig sig = signature as MethodDefSig;
 295                         if (sig == null)
 296                                 return;
 297
 298                         int sentinel = sig.Sentinel;
 299
 300                         if (sig.Sentinel < 0 || sig.Sentinel >= meth.Parameters.Count)
 301                                 return;
 302
 303                         ParameterDefinition param = meth.Parameters [sentinel];
 304                         param.ParameterType = new SentinelType (param.ParameterType);
 305                 }
 306
 307                 public PropertyDefinition GetPropertyDefAt (uint rid)
 308                 {
 309                         if (rid > m_properties.Length)
 310                                 return null;
 311
 312                         return m_properties [rid - 1];
 313                 }
 314
 315                 public EventDefinition GetEventDefAt (uint rid)
 316                 {
 317                         if (rid > m_events.Length)
 318                                 return null;
 319
 320                         return m_events [rid - 1];
 321                 }
 322
 323                 public ParameterDefinition GetParamDefAt (uint rid)
 324                 {
 325                         if (rid > m_parameters.Length)
 326                                 return null;
 327
 328                         return m_parameters [rid - 1];
 329                 }
 330
 331                 public GenericParameter GetGenericParameterAt (uint rid)
 332                 {
 333                         if (rid > m_genericParameters.Length)
 334                                 return null;
 335
 336                         return m_genericParameters [rid - 1];
 337                 }
 338
 339                 public GenericInstanceMethod GetMethodSpecAt (uint rid, GenericContext context)
 340                 {
 341                         if (rid > m_methodSpecs.Length)
 342                                 return null;
 343
 344                         int index = (int) rid - 1;
 345                         GenericInstanceMethod gim = m_methodSpecs [index];
 346                         if (gim != null)
 347                                 return gim;
 348
 349                         MethodSpecTable msTable = m_tableReader.GetMethodSpecTable ();
 350                         MethodSpecRow msRow = msTable [index];
 351
 352                         MethodSpec sig = m_sigReader.GetMethodSpec (msRow.Instantiation);
 353
 354                         MethodReference meth;
 355                         if (msRow.Method.TokenType == TokenType.Method)
 356                                 meth = GetMethodDefAt (msRow.Method.RID);
 357                         else if (msRow.Method.TokenType == TokenType.MemberRef)
 358                                 meth = (MethodReference) GetMemberRefAt (msRow.Method.RID, context);
 359                         else
 360                                 throw new ReflectionException ("Unknown method type for method spec");
 361
 362                         gim = new GenericInstanceMethod (meth);
 363                         context.CheckProvider (meth, sig.Signature.Arity);
 364                         foreach (GenericArg arg in sig.Signature.Types)
 365                                 gim.GenericArguments.Add (GetGenericArg (arg, context));
 366
 367                         m_methodSpecs [index] = gim;
 368
 369                         return gim;
 370                 }
 371
 372                 public TypeReference GetTypeDefOrRef (MetadataToken token, GenericContext context)
 373                 {
 374                         if (token.RID == 0)
 375                                 return null;
 376
 377                         switch (token.TokenType) {
 378                         case TokenType.TypeDef :
 379                                 return GetTypeDefAt (token.RID);
 380                         case TokenType.TypeRef :
 381                                 return GetTypeRefAt (token.RID);
 382                         case TokenType.TypeSpec :
 383                                 return GetTypeSpecAt (token.RID, context);
 384                         default :
 385                                 return null;
 386                         }
 387                 }
 388
 389                 public TypeReference SearchCoreType (string fullName)
 390                 {
 391                         if (m_isCorlib)
 392                                 return m_module.Types [fullName];
 393
 394                         TypeReference coreType =  m_module.TypeReferences [fullName];
 395                         if (coreType == null) {
 396                                 string [] parts = fullName.Split ('.');
 397                                 if (parts.Length != 2)
 398                                         throw new ReflectionException ("Unvalid core type name");
 399                                 coreType = new TypeReference (parts [1], parts [0], Corlib);
 400                                 m_module.TypeReferences.Add (coreType);
 401                         }
 402                         if (!coreType.IsValueType) {
 403                                 switch (coreType.FullName) {
 404                                 case Constants.Boolean :
 405                                 case Constants.Char :
 406                                 case Constants.Single :
 407                                 case Constants.Double :
 408                                 case Constants.SByte :
 409                                 case Constants.Byte :
 410                                 case Constants.Int16 :
 411                                 case Constants.UInt16 :
 412                                 case Constants.Int32 :
 413                                 case Constants.UInt32 :
 414                                 case Constants.Int64 :
 415                                 case Constants.UInt64 :
 416                                 case Constants.IntPtr :
 417                                 case Constants.UIntPtr :
 418                                         coreType.IsValueType = true;
 419                                         break;
 420                                 }
 421                         }
 422                         return coreType;
 423                 }
 424
 425                 public IMetadataTokenProvider LookupByToken (MetadataToken token)
 426                 {
 427                         switch (token.TokenType) {
 428                         case TokenType.TypeDef :
 429                                 return GetTypeDefAt (token.RID);
 430                         case TokenType.TypeRef :
 431                                 return GetTypeRefAt (token.RID);
 432                         case TokenType.Method :
 433                                 return GetMethodDefAt (token.RID);
 434                         case TokenType.Field :
 435                                 return GetFieldDefAt (token.RID);
 436                         case TokenType.Event :
 437                                 return GetEventDefAt (token.RID);
 438                         case TokenType.Property :
 439                                 return GetPropertyDefAt (token.RID);
 440                         case TokenType.Param :
 441                                 return GetParamDefAt (token.RID);
 442                         default :
 443                                 throw new NotSupportedException ("Lookup is not allowed on this kind of token");
 444                         }
 445                 }
 446
 447                 public CustomAttribute GetCustomAttribute (MethodReference ctor, byte [] data, bool resolve)
 448                 {
 449                         CustomAttrib sig = m_sigReader.GetCustomAttrib (data, ctor, resolve);
 450                         return BuildCustomAttribute (ctor, data, sig);
 451                 }
 452
 453                 public CustomAttribute GetCustomAttribute (MethodReference ctor, byte [] data)
 454                 {
 455                         return GetCustomAttribute (ctor, data, false);
 456                 }
 457
 458                 public override void VisitModuleDefinition (ModuleDefinition mod)
 459                 {
 460                         VisitTypeDefinitionCollection (mod.Types);
 461                 }
 462
 463                 public override void VisitTypeDefinitionCollection (TypeDefinitionCollection types)
 464                 {
 465                         // type def reading
 466                         TypeDefTable typesTable = m_tableReader.GetTypeDefTable ();
 467                         m_typeDefs = new TypeDefinition [typesTable.Rows.Count];
 468                         for (int i = 0; i < typesTable.Rows.Count; i++) {
 469                                 TypeDefRow type = typesTable [i];
 470                                 TypeDefinition t = new TypeDefinition (
 471                                         m_root.Streams.StringsHeap [type.Name],
 472                                         m_root.Streams.StringsHeap [type.Namespace],
 473                                         type.Flags);
 474                                 t.MetadataToken = MetadataToken.FromMetadataRow (TokenType.TypeDef, i);
 475
 476                                 m_typeDefs [i] = t;
 477                         }
 478
 479                         // nested types
 480                         if (m_tHeap.HasTable (NestedClassTable.RId)) {
 481                                 NestedClassTable nested = m_tableReader.GetNestedClassTable ();
 482                                 for (int i = 0; i < nested.Rows.Count; i++) {
 483                                         NestedClassRow row = nested [i];
 484
 485                                         TypeDefinition parent = GetTypeDefAt (row.EnclosingClass);
 486                                         TypeDefinition child = GetTypeDefAt (row.NestedClass);
 487
 488                                         if (!IsDeleted (child))
 489                                                 parent.NestedTypes.Add (child);
 490                                 }
 491                         }
 492
 493                         foreach (TypeDefinition type in m_typeDefs)
 494                                 if (!IsDeleted (type))
 495                                         types.Add (type);
 496
 497                         // type ref reading
 498                         if (m_tHeap.HasTable (TypeRefTable.RId)) {
 499                                 TypeRefTable typesRef = m_tableReader.GetTypeRefTable ();
 500
 501                                 m_typeRefs = new TypeReference [typesRef.Rows.Count];
 502
 503                                 for (int i = 0; i < typesRef.Rows.Count; i++)
 504                                         AddTypeRef (typesRef, i);
 505                         } else
 506                                 m_typeRefs = new TypeReference [0];
 507
 508                         ReadTypeSpecs ();
 509                         ReadMethodSpecs ();
 510
 511                         ReadMethods ();
 512                         ReadGenericParameters ();
 513
 514                         // set base types
 515                         for (int i = 0; i < typesTable.Rows.Count; i++) {
 516                                 TypeDefRow type = typesTable [i];
 517                                 TypeDefinition child = m_typeDefs [i];
 518                                 child.BaseType = GetTypeDefOrRef (type.Extends, new GenericContext (child));
 519                         }
 520
 521                         CompleteMethods ();
 522                         ReadAllFields ();
 523                         ReadMemberReferences ();
 524                 }
 525
 526                 void AddTypeRef (TypeRefTable typesRef, int i)
 527                 {
 528                         if (i >= typesRef.Rows.Count)
 529                                 return;
 530
 531                         // Check if index has been already added.
 532                         if (m_typeRefs [i] != null)
 533                                 return;
 534
 535                         TypeRefRow type = typesRef [i];
 536                         IMetadataScope scope = null;
 537                         TypeReference parent = null;
 538
 539                         if (type.ResolutionScope.RID != 0) {
 540                                 int rid = (int) type.ResolutionScope.RID - 1;
 541                                 switch (type.ResolutionScope.TokenType) {
 542                                 case TokenType.AssemblyRef:
 543                                         scope = m_module.AssemblyReferences [rid];
 544                                         break;
 545                                 case TokenType.ModuleRef:
 546                                         scope = m_module.ModuleReferences [rid];
 547                                         break;
 548                                 case TokenType.Module:
 549                                         scope = m_module.Assembly.Modules [rid];
 550                                         break;
 551                                 case TokenType.TypeRef:
 552                                         AddTypeRef (typesRef, rid);
 553                                         parent = GetTypeRefAt (type.ResolutionScope.RID);
 554                                         if (parent != null)
 555                                                 scope = parent.Scope;
 556                                         break;
 557                                 }
 558                         }
 559
 560                         TypeReference t = new TypeReference (
 561                                 m_root.Streams.StringsHeap [type.Name],
 562                                 m_root.Streams.StringsHeap [type.Namespace],
 563                                 scope);
 564                         t.MetadataToken = MetadataToken.FromMetadataRow (TokenType.TypeRef, i);
 565
 566                         if (parent != null)
 567                                 t.DeclaringType = parent;
 568
 569                         m_typeRefs [i] = t;
 570                         m_module.TypeReferences.Add (t);
 571                 }
 572
 573                 void ReadTypeSpecs ()
 574                 {
 575                         if (!m_tHeap.HasTable (TypeSpecTable.RId))
 576                                 return;
 577
 578                         TypeSpecTable tsTable = m_tableReader.GetTypeSpecTable ();
 579                         m_typeSpecs = new TypeReference [tsTable.Rows.Count];
 580                 }
 581
 582                 void ReadMethodSpecs ()
 583                 {
 584                         if (!m_tHeap.HasTable (MethodSpecTable.RId))
 585                                 return;
 586
 587                         MethodSpecTable msTable = m_tableReader.GetMethodSpecTable ();
 588                         m_methodSpecs = new GenericInstanceMethod [msTable.Rows.Count];
 589                 }
 590
 591                 void ReadGenericParameters ()
 592                 {
 593                         if (!m_tHeap.HasTable (GenericParamTable.RId))
 594                                 return;
 595
 596                         GenericParamTable gpTable = m_tableReader.GetGenericParamTable ();
 597                         m_genericParameters = new GenericParameter [gpTable.Rows.Count];
 598                         for (int i = 0; i < gpTable.Rows.Count; i++) {
 599                                 GenericParamRow gpRow = gpTable [i];
 600                                 IGenericParameterProvider owner;
 601                                 if (gpRow.Owner.TokenType == TokenType.Method)
 602                                         owner = GetMethodDefAt (gpRow.Owner.RID);
 603                                 else if (gpRow.Owner.TokenType == TokenType.TypeDef)
 604                                         owner = GetTypeDefAt (gpRow.Owner.RID);
 605                                 else
 606                                         throw new ReflectionException ("Unknown owner type for generic parameter");
 607
 608                                 GenericParameter gp = new GenericParameter (gpRow.Number, owner);
 609                                 gp.Attributes = gpRow.Flags;
 610                                 gp.Name = MetadataRoot.Streams.StringsHeap [gpRow.Name];
 611                                 gp.MetadataToken = MetadataToken.FromMetadataRow (TokenType.GenericParam, i);
 612
 613                                 owner.GenericParameters.Add (gp);
 614                                 m_genericParameters [i] = gp;
 615                         }
 616                 }
 617
 618                 void ReadAllFields ()
 619                 {
 620                         TypeDefTable tdefTable = m_tableReader.GetTypeDefTable ();
 621
 622                         if (!m_tHeap.HasTable (FieldTable.RId)) {
 623                                 m_fields = new FieldDefinition [0];
 624                                 return;
 625                         }
 626
 627                         FieldTable fldTable = m_tableReader.GetFieldTable ();
 628                         m_fields = new FieldDefinition [fldTable.Rows.Count];
 629
 630                         for (int i = 0; i < m_typeDefs.Length; i++) {
 631                                 TypeDefinition dec = m_typeDefs [i];
 632                                 GenericContext context = new GenericContext (dec);
 633
 634                                 int index = i, next;
 635
 636                                 if (index == tdefTable.Rows.Count - 1)
 637                                         next = fldTable.Rows.Count + 1;
 638                                 else
 639                                         next = (int) (tdefTable [index + 1]).FieldList;
 640
 641                                 for (int j = (int) tdefTable [index].FieldList; j < next; j++) {
 642                                         FieldRow frow = fldTable [j - 1];
 643                                         FieldSig fsig = m_sigReader.GetFieldSig (frow.Signature);
 644
 645                                         FieldDefinition fdef = new FieldDefinition (
 646                                                 m_root.Streams.StringsHeap [frow.Name],
 647                                                 GetTypeRefFromSig (fsig.Type, context), frow.Flags);
 648                                         fdef.MetadataToken = MetadataToken.FromMetadataRow (TokenType.Field, j - 1);
 649
 650                                         if (fsig.CustomMods.Length > 0)
 651                                                 fdef.FieldType = GetModifierType (fsig.CustomMods, fdef.FieldType);
 652
 653                                         if (!IsDeleted (fdef))
 654                                                 dec.Fields.Add (fdef);
 655
 656                                         m_fields [j - 1] = fdef;
 657                                 }
 658                         }
 659                 }
 660
 661                 void ReadMethods ()
 662                 {
 663                         if (!m_tHeap.HasTable (MethodTable.RId)) {
 664                                 m_meths = new MethodDefinition [0];
 665                                 return;
 666                         }
 667
 668                         MethodTable mTable = m_tableReader.GetMethodTable ();
 669                         m_meths = new MethodDefinition [mTable.Rows.Count];
 670                         for (int i = 0; i < mTable.Rows.Count; i++) {
 671                                 MethodRow mRow = mTable [i];
 672                                 MethodDefinition meth = new MethodDefinition (
 673                                         m_root.Streams.StringsHeap [mRow.Name],
 674                                         mRow.Flags);
 675                                 meth.RVA = mRow.RVA;
 676                                 meth.ImplAttributes = mRow.ImplFlags;
 677
 678                                 meth.MetadataToken = MetadataToken.FromMetadataRow (TokenType.Method, i);
 679
 680                                 m_meths [i] = meth;
 681                         }
 682                 }
 683
 684                 void CompleteMethods ()
 685                 {
 686                         TypeDefTable tdefTable = m_tableReader.GetTypeDefTable ();
 687
 688                         if (!m_tHeap.HasTable (MethodTable.RId)) {
 689                                 m_meths = new MethodDefinition [0];
 690                                 return;
 691                         }
 692
 693                         MethodTable methTable = m_tableReader.GetMethodTable ();
 694                         ParamTable paramTable = m_tableReader.GetParamTable ();
 695                         if (!m_tHeap.HasTable (ParamTable.RId))
 696                                 m_parameters = new ParameterDefinition [0];
 697                         else
 698                                 m_parameters = new ParameterDefinition [paramTable.Rows.Count];
 699
 700                         for (int i = 0; i < m_typeDefs.Length; i++) {
 701                                 TypeDefinition dec = m_typeDefs [i];
 702
 703                                 int index = i, next;
 704
 705                                 if (index == tdefTable.Rows.Count - 1)
 706                                         next = methTable.Rows.Count + 1;
 707                                 else
 708                                         next = (int) (tdefTable [index + 1]).MethodList;
 709
 710                                 for (int j = (int) tdefTable [index].MethodList; j < next; j++) {
 711                                         MethodRow methRow = methTable [j - 1];
 712                                         MethodDefinition mdef = m_meths [j - 1];
 713
 714                                         if (!IsDeleted (mdef)) {
 715                                                 if (mdef.IsConstructor)
 716                                                         dec.Constructors.Add (mdef);
 717                                                 else
 718                                                         dec.Methods.Add (mdef);
 719                                         }
 720
 721                                         GenericContext context = new GenericContext (mdef);
 722
 723                                         MethodDefSig msig = m_sigReader.GetMethodDefSig (methRow.Signature);
 724                                         mdef.HasThis = msig.HasThis;
 725                                         mdef.ExplicitThis = msig.ExplicitThis;
 726                                         mdef.CallingConvention = msig.MethCallConv;
 727
 728                                         int prms;
 729                                         if (j == methTable.Rows.Count)
 730                                                 prms = m_parameters.Length + 1;
 731                                         else
 732                                                 prms = (int) (methTable [j]).ParamList;
 733
 734                                         ParameterDefinition retparam = null;
 735
 736                                         //TODO: optimize this
 737                                         int start = (int) methRow.ParamList - 1;
 738
 739                                         if (paramTable != null && start < prms - 1) {
 740
 741                                                 ParamRow pRetRow = paramTable [start];
 742
 743                                                 if (pRetRow != null && pRetRow.Sequence == 0) { // ret type
 744
 745                                                         retparam = new ParameterDefinition (
 746                                                                 m_root.Streams.StringsHeap [pRetRow.Name],
 747                                                                 0,
 748                                                                 pRetRow.Flags,
 749                                                                 null);
 750
 751                                                         retparam.Method = mdef;
 752                                                         m_parameters [start] = retparam;
 753                                                         start++;
 754                                                 }
 755                                         }
 756
 757                                         for (int k = 0; k < msig.ParamCount; k++) {
 758
 759                                                 int pointer = start + k;
 760
 761                                                 ParamRow pRow = null;
 762
 763                                                 if (paramTable != null && pointer < prms - 1)
 764                                                         pRow = paramTable [pointer];
 765
 766                                                 Param psig = msig.Parameters [k];
 767
 768                                                 ParameterDefinition pdef;
 769                                                 if (pRow != null) {
 770                                                         pdef = BuildParameterDefinition (
 771                                                                 m_root.Streams.StringsHeap [pRow.Name],
 772                                                                 pRow.Sequence, pRow.Flags, psig, context);
 773                                                         pdef.MetadataToken = MetadataToken.FromMetadataRow (TokenType.Param, pointer);
 774                                                         m_parameters [pointer] = pdef;
 775                                                 } else
 776                                                         pdef = BuildParameterDefinition (k + 1, psig, context);
 777
 778                                                 pdef.Method = mdef;
 779                                                 mdef.Parameters.Add (pdef);
 780                                         }
 781
 782                                         mdef.ReturnType = GetMethodReturnType (msig, context);
 783                                         MethodReturnType mrt = mdef.ReturnType;
 784                                         mrt.Method = mdef;
 785                                         if (retparam != null) {
 786                                                 mrt.Parameter = retparam;
 787                                                 mrt.Parameter.ParameterType = mrt.ReturnType;
 788                                         }
 789                                 }
 790                         }
 791
 792                         uint eprid = CodeReader.GetRid ((int) m_reader.Image.CLIHeader.EntryPointToken);
 793                         if (eprid > 0 && eprid <= m_meths.Length)
 794                                 m_module.Assembly.EntryPoint = GetMethodDefAt (eprid);
 795                 }
 796
 797                 void ReadMemberReferences ()
 798                 {
 799                         if (!m_tHeap.HasTable (MemberRefTable.RId))
 800                                 return;
 801
 802                         MemberRefTable mrefTable = m_tableReader.GetMemberRefTable ();
 803                         m_memberRefs = new MemberReference [mrefTable.Rows.Count];
 804                 }
 805
 806                 public override void VisitExternTypeCollection (ExternTypeCollection externs)
 807                 {
 808                         ExternTypeCollection ext = externs;
 809
 810                         if (!m_tHeap.HasTable (ExportedTypeTable.RId))
 811                                 return;
 812
 813                         ExportedTypeTable etTable = m_tableReader.GetExportedTypeTable ();
 814                         TypeReference [] buffer = new TypeReference [etTable.Rows.Count];
 815
 816                         for (int i = 0; i < etTable.Rows.Count; i++) {
 817                                 ExportedTypeRow etRow = etTable [i];
 818
 819                                 buffer [i] = new TypeDefinition (
 820                                         m_root.Streams.StringsHeap [etRow.TypeName],
 821                                         m_root.Streams.StringsHeap [etRow.TypeNamespace],
 822                                         etRow.Flags);
 823                                 buffer [i].AttachToScope (GetExportedTypeScope (etRow.Implementation));
 824                         }
 825
 826                         for (int i = 0; i < etTable.Rows.Count; i++) {
 827                                 ExportedTypeRow etRow = etTable [i];
 828                                 if (etRow.Implementation.TokenType != TokenType.ExportedType)
 829                                         continue;
 830
 831                                 TypeReference exported = buffer [i];
 832                                 TypeReference owner = buffer [etRow.Implementation.RID - 1];
 833                                 exported.DeclaringType = owner;
 834                                 exported.AttachToScope (owner.Scope);
 835                         }
 836
 837                         for (int i = 0; i < buffer.Length; i++) {
 838                                 TypeReference curs = buffer [i];
 839                                 if (curs != null)
 840                                         ext.Add (curs);
 841                         }
 842                 }
 843
 844                 IMetadataScope GetExportedTypeScope (MetadataToken scope)
 845                 {
 846                         int index = (int) scope.RID - 1;
 847                         switch (scope.TokenType) {
 848                         case TokenType.AssemblyRef:
 849                                 return Module.AssemblyReferences [index];
 850                         case TokenType.File:
 851                                 return Module.ModuleReferences [index];
 852                         case TokenType.ExportedType:
 853                                 return null; // resolved later
 854                         default:
 855                                 throw new NotSupportedException ();
 856                         }
 857                 }
 858
 859                 static object GetFixedArgValue (CustomAttrib.FixedArg fa)
 860                 {
 861                         if (fa.SzArray) {
 862                                 object [] vals = new object [fa.NumElem];
 863                                 for (int j = 0; j < vals.Length; j++)
 864                                         vals [j] = fa.Elems [j].Value;
 865                                 return vals;
 866                         } else
 867                                 return fa.Elems [0].Value;
 868                 }
 869
 870                 TypeReference GetFixedArgType (CustomAttrib.FixedArg fa)
 871                 {
 872                         if (fa.SzArray) {
 873                                 if (fa.NumElem == 0)
 874                                         return new ArrayType (SearchCoreType (Constants.Object));
 875                                 else
 876                                         return new ArrayType (fa.Elems [0].ElemType);
 877                         } else
 878                                 return fa.Elems [0].ElemType;
 879                 }
 880
 881                 TypeReference GetNamedArgType (CustomAttrib.NamedArg na)
 882                 {
 883                         if (na.FieldOrPropType == ElementType.Boxed)
 884                                 return SearchCoreType (Constants.Object);
 885
 886                         return GetFixedArgType (na.FixedArg);
 887                 }
 888
 889                 protected CustomAttribute BuildCustomAttribute (MethodReference ctor, byte [] data, CustomAttrib sig)
 890                 {
 891                         CustomAttribute cattr = new CustomAttribute (ctor);
 892                         if (!sig.Read) {
 893                                 cattr.Resolved = false;
 894                                 cattr.Blob = data;
 895                                 return cattr;
 896                         }
 897
 898                         foreach (CustomAttrib.FixedArg fa in sig.FixedArgs)
 899                                 cattr.ConstructorParameters.Add (GetFixedArgValue (fa));
 900
 901                         foreach (CustomAttrib.NamedArg na in sig.NamedArgs) {
 902                                 object value = GetFixedArgValue (na.FixedArg);
 903                                 if (na.Field) {
 904                                         cattr.Fields [na.FieldOrPropName] = value;
 905                                         cattr.SetFieldType (na.FieldOrPropName, GetNamedArgType (na));
 906                                 } else if (na.Property) {
 907                                         cattr.Properties [na.FieldOrPropName] = value;
 908                                         cattr.SetPropertyType (na.FieldOrPropName, GetNamedArgType (na));
 909                                 } else
 910                                         throw new ReflectionException ("Non valid named arg");
 911                         }
 912
 913                         return cattr;
 914                 }
 915
 916                 void CompleteParameter (ParameterDefinition parameter, Param signature, GenericContext context)
 917                 {
 918                         TypeReference paramType;
 919
 920                         if (signature.TypedByRef)
 921                                 paramType = SearchCoreType (Constants.TypedReference);
 922                         else
 923                                 paramType = GetTypeRefFromSig (signature.Type, context);
 924
 925                         paramType = GetModifierType (signature.CustomMods, paramType);
 926
 927                         if (signature.ByRef)
 928                                 paramType = new ReferenceType (paramType);
 929
 930                         parameter.ParameterType = paramType;
 931                 }
 932
 933                 public ParameterDefinition BuildParameterDefinition (int sequence, Param psig, GenericContext context)
 934                 {
 935                         ParameterDefinition parameter = new ParameterDefinition (null);
 936                         parameter.Sequence = sequence;
 937
 938                         CompleteParameter (parameter, psig, context);
 939
 940                         return parameter;
 941                 }
 942
 943                 public ParameterDefinition BuildParameterDefinition (string name, int sequence, ParameterAttributes attrs, Param psig, GenericContext context)
 944                 {
 945                         ParameterDefinition parameter = new ParameterDefinition (name, sequence, attrs, null);
 946
 947                         CompleteParameter (parameter, psig, context);
 948
 949                         return parameter;
 950                 }
 951
 952                 protected SecurityDeclaration BuildSecurityDeclaration (DeclSecurityRow dsRow)
 953                 {
 954                         return BuildSecurityDeclaration (dsRow.Action, m_root.Streams.BlobHeap.Read (dsRow.PermissionSet));
 955                 }
 956
 957                 public SecurityDeclaration BuildSecurityDeclaration (SecurityAction action, byte [] permset)
 958                 {
 959                         if (m_secReader == null)
 960                                 m_secReader = new SecurityDeclarationReader (m_root, this);
 961
 962                         return m_secReader.FromByteArray (action, permset);
 963                 }
 964
 965                 protected MarshalSpec BuildMarshalDesc (MarshalSig ms, IHasMarshalSpec container)
 966                 {
 967                         if (ms.Spec is MarshalSig.Array) {
 968                                 ArrayMarshalSpec amd = new ArrayMarshalSpec (container);
 969                                 MarshalSig.Array ar = (MarshalSig.Array) ms.Spec;
 970                                 amd.ElemType = ar.ArrayElemType;
 971                                 amd.NumElem = ar.NumElem;
 972                                 amd.ParamNum = ar.ParamNum;
 973                                 amd.ElemMult = ar.ElemMult;
 974                                 return amd;
 975                         } else if (ms.Spec is MarshalSig.CustomMarshaler) {
 976                                 CustomMarshalerSpec cmd = new CustomMarshalerSpec (container);
 977                                 MarshalSig.CustomMarshaler cmsig = (MarshalSig.CustomMarshaler) ms.Spec;
 978                                 cmd.Guid = cmsig.Guid.Length > 0 ? new Guid (cmsig.Guid) : new Guid ();
 979                                 cmd.UnmanagedType = cmsig.UnmanagedType;
 980                                 cmd.ManagedType = cmsig.ManagedType;
 981                                 cmd.Cookie = cmsig.Cookie;
 982                                 return cmd;
 983                         } else if (ms.Spec is MarshalSig.FixedArray) {
 984                                 FixedArraySpec fad = new FixedArraySpec (container);
 985                                 MarshalSig.FixedArray fasig = (MarshalSig.FixedArray) ms.Spec;
 986                                 fad.ElemType = fasig.ArrayElemType;
 987                                 fad.NumElem = fasig.NumElem;
 988                                 return fad;
 989                         } else if (ms.Spec is MarshalSig.FixedSysString) {
 990                                 FixedSysStringSpec fssc = new FixedSysStringSpec (container);
 991                                 fssc.Size = ((MarshalSig.FixedSysString) ms.Spec).Size;
 992                                 return fssc;
 993                         } else if (ms.Spec is MarshalSig.SafeArray) {
 994                                 SafeArraySpec sad = new SafeArraySpec (container);
 995                                 sad.ElemType = ((MarshalSig.SafeArray) ms.Spec).ArrayElemType;
 996                                 return sad;
 997                         } else {
 998                                 return new MarshalSpec (ms.NativeInstrinsic, container);
 999                         }
1000                 }
1001
1002                 public TypeReference GetModifierType (CustomMod [] cmods, TypeReference type)
1003                 {
1004                         if (cmods == null || cmods.Length == 0)
1005                                 return type;
1006
1007                         TypeReference ret = type;
1008                         for (int i = cmods.Length - 1; i >= 0; i--) {
1009                                 CustomMod cmod = cmods [i];
1010                                 TypeReference modType;
1011
1012                                 if (cmod.TypeDefOrRef.RID == 0)
1013                                         continue;
1014
1015                                 if (cmod.TypeDefOrRef.TokenType == TokenType.TypeDef)
1016                                         modType = GetTypeDefAt (cmod.TypeDefOrRef.RID);
1017                                 else
1018                                         modType = GetTypeRefAt (cmod.TypeDefOrRef.RID);
1019
1020                                 if (cmod.CMOD == CustomMod.CMODType.OPT)
1021                                         ret = new ModifierOptional (ret, modType);
1022                                 else if (cmod.CMOD == CustomMod.CMODType.REQD)
1023                                         ret = new ModifierRequired (ret, modType);
1024                         }
1025                         return ret;
1026                 }
1027
1028                 public MethodReturnType GetMethodReturnType (MethodSig msig, GenericContext context)
1029                 {
1030                         TypeReference retType;
1031                         if (msig.RetType.Void)
1032                                 retType = SearchCoreType (Constants.Void);
1033                         else if (msig.RetType.TypedByRef)
1034                                 retType = SearchCoreType (Constants.TypedReference);
1035                         else
1036                                 retType = GetTypeRefFromSig (msig.RetType.Type, context);
1037
1038                         retType = GetModifierType (msig.RetType.CustomMods, retType);
1039
1040                         if (msig.RetType.ByRef)
1041                                 retType = new ReferenceType (retType);
1042
1043                         return new MethodReturnType (retType);
1044                 }
1045
1046                 public TypeReference GetTypeRefFromSig (SigType t, GenericContext context)
1047                 {
1048                         switch (t.ElementType) {
1049                         case ElementType.Class :
1050                                 CLASS c = t as CLASS;
1051                                 return GetTypeDefOrRef (c.Type, context);
1052                         case ElementType.ValueType :
1053                                 VALUETYPE vt = t as VALUETYPE;
1054                                 TypeReference vtr = GetTypeDefOrRef (vt.Type, context);
1055                                 vtr.IsValueType = true;
1056                                 return vtr;
1057                         case ElementType.String :
1058                                 return SearchCoreType (Constants.String);
1059                         case ElementType.Object :
1060                                 return SearchCoreType (Constants.Object);
1061                         case ElementType.Void :
1062                                 return SearchCoreType (Constants.Void);
1063                         case ElementType.Boolean :
1064                                 return SearchCoreType (Constants.Boolean);
1065                         case ElementType.Char :
1066                                 return SearchCoreType (Constants.Char);
1067                         case ElementType.I1 :
1068                                 return SearchCoreType (Constants.SByte);
1069                         case ElementType.U1 :
1070                                 return SearchCoreType (Constants.Byte);
1071                         case ElementType.I2 :
1072                                 return SearchCoreType (Constants.Int16);
1073                         case ElementType.U2 :
1074                                 return SearchCoreType (Constants.UInt16);
1075                         case ElementType.I4 :
1076                                 return SearchCoreType (Constants.Int32);
1077                         case ElementType.U4 :
1078                                 return SearchCoreType (Constants.UInt32);
1079                         case ElementType.I8 :
1080                                 return SearchCoreType (Constants.Int64);
1081                         case ElementType.U8 :
1082                                 return SearchCoreType (Constants.UInt64);
1083                         case ElementType.R4 :
1084                                 return SearchCoreType (Constants.Single);
1085                         case ElementType.R8 :
1086                                 return SearchCoreType (Constants.Double);
1087                         case ElementType.I :
1088                                 return SearchCoreType (Constants.IntPtr);
1089                         case ElementType.U :
1090                                 return SearchCoreType (Constants.UIntPtr);
1091                         case ElementType.TypedByRef :
1092                                 return SearchCoreType (Constants.TypedReference);
1093                         case ElementType.Array :
1094                                 ARRAY ary = t as ARRAY;
1095                                 return new ArrayType (GetTypeRefFromSig (ary.Type, context), ary.Shape);
1096                         case ElementType.SzArray :
1097                                 SZARRAY szary = t as SZARRAY;
1098                                 ArrayType at = new ArrayType (GetTypeRefFromSig (szary.Type, context));
1099                                 return at;
1100                         case ElementType.Ptr :
1101                                 PTR pointer = t as PTR;
1102                                 if (pointer.Void)
1103                                         return new PointerType (SearchCoreType (Constants.Void));
1104                                 return new PointerType (GetTypeRefFromSig (pointer.PtrType, context));
1105                         case ElementType.FnPtr :
1106                                 FNPTR funcptr = t as FNPTR;
1107                                 FunctionPointerType fnptr = new FunctionPointerType (funcptr.Method.HasThis, funcptr.Method.ExplicitThis,
1108                                         funcptr.Method.MethCallConv, GetMethodReturnType (funcptr.Method, context));
1109
1110                                 for (int i = 0; i < funcptr.Method.ParamCount; i++) {
1111                                         Param p = funcptr.Method.Parameters [i];
1112                                         fnptr.Parameters.Add (BuildParameterDefinition (i, p, context));
1113                                 }
1114
1115                                 CreateSentinelIfNeeded (fnptr, funcptr.Method);
1116
1117                                 return fnptr;
1118                         case ElementType.Var:
1119                                 VAR var = t as VAR;
1120                                 context.CheckProvider (context.Type, var.Index + 1);
1121
1122                                 if (context.Type is GenericInstanceType)
1123                                         return (context.Type as GenericInstanceType).GenericArguments [var.Index];
1124                                 else
1125                                         return context.Type.GenericParameters [var.Index];
1126                         case ElementType.MVar:
1127                                 MVAR mvar = t as MVAR;
1128                                 context.CheckProvider (context.Method, mvar.Index + 1);
1129
1130                                 if (context.Method is GenericInstanceMethod)
1131                                         return (context.Method as GenericInstanceMethod).GenericArguments [mvar.Index];
1132                                 else
1133                                         return context.Method.GenericParameters [mvar.Index];
1134                         case ElementType.GenericInst:
1135                                 GENERICINST ginst = t as GENERICINST;
1136                                 GenericInstanceType instance = new GenericInstanceType (GetTypeDefOrRef (ginst.Type, context));
1137                                 instance.IsValueType = ginst.ValueType;
1138                                 context.CheckProvider (instance.GetOriginalType (), ginst.Signature.Arity);
1139
1140                                 for (int i = 0; i < ginst.Signature.Arity; i++)
1141                                         instance.GenericArguments.Add (GetGenericArg (
1142                                                 ginst.Signature.Types [i], context));
1143
1144                                 return instance;
1145                         default:
1146                                 break;
1147                         }
1148                         return null;
1149                 }
1150
1151                 TypeReference GetGenericArg (GenericArg arg, GenericContext context)
1152                 {
1153                         TypeReference type = GetTypeRefFromSig (arg.Type, context);
1154                         type = GetModifierType (arg.CustomMods, type);
1155                         return type;
1156                 }
1157
1158                 static bool IsOdd (int i)
1159                 {
1160                         return (i & 1) == 1;
1161                 }
1162
1163                 protected object GetConstant (uint pos, ElementType elemType)
1164                 {
1165                         if (elemType == ElementType.Class)
1166                                 return null;
1167
1168                         byte [] constant = m_root.Streams.BlobHeap.Read (pos);
1169
1170                         if (elemType == ElementType.String) {
1171                                 int length = constant.Length;
1172                                 if (IsOdd (length))
1173                                         length--;
1174
1175                                 return Encoding.Unicode.GetString (constant, 0, length);
1176                         }
1177
1178                         // One byte types can always be read using BitConverter. However it can't be used
1179                         // elsewhere since it behaves differently in Mono compared to CF on BE architectures
1180                         switch (elemType) {
1181                         case ElementType.Boolean :
1182                                 return BitConverter.ToBoolean (constant, 0);
1183                         case ElementType.I1 :
1184                                 return (sbyte) constant [0];
1185                         case ElementType.U1 :
1186                                 return (byte) constant [0];
1187                         case ElementType.Object: // illegal, but foundable
1188                                 return null;
1189                         default :
1190                                 if (BitConverter.IsLittleEndian)
1191                                         return GetConstantLittleEndian (elemType, constant);
1192                                 else
1193                                         return GetConstantBigEndian (elemType, constant);
1194                         }
1195                 }
1196
1197                 static object GetConstantLittleEndian (ElementType elemType, byte [] constant)
1198                 {
1199                         switch (elemType) {
1200                         case ElementType.Char :
1201                                 return BitConverter.ToChar (constant, 0);
1202                         case ElementType.I2 :
1203                                 return BitConverter.ToInt16 (constant, 0);
1204                         case ElementType.I4 :
1205                                 return BitConverter.ToInt32 (constant, 0);
1206                         case ElementType.I8 :
1207                                 return BitConverter.ToInt64 (constant, 0);
1208                         case ElementType.U2 :
1209                                 return BitConverter.ToUInt16 (constant, 0);
1210                         case ElementType.U4 :
1211                                 return BitConverter.ToUInt32 (constant, 0);
1212                         case ElementType.U8 :
1213                                 return BitConverter.ToUInt64 (constant, 0);
1214                         case ElementType.R4 :
1215                                 return BitConverter.ToSingle (constant, 0);
1216                         case ElementType.R8 :
1217                                 return BitConverter.ToDouble (constant, 0);
1218                         default:
1219                                 throw new ReflectionException ("Non valid element in constant table");
1220                         }
1221                 }
1222
1223                 static object GetConstantBigEndian (ElementType elemType, byte [] constant)
1224                 {
1225                         // BinaryReader always read it's data in LE format
1226                         // note: this could be further optimized (even without unsafe code)
1227                         BinaryReader br = new BinaryReader (new MemoryStream (constant));
1228                         switch (elemType) {
1229                         case ElementType.Char :
1230                                 return (char) br.ReadUInt16 ();
1231                         case ElementType.I2 :
1232                                 return br.ReadInt16 ();
1233                         case ElementType.I4 :
1234                                 return br.ReadInt32 ();
1235                         case ElementType.I8 :
1236                                 return br.ReadInt64 ();
1237                         case ElementType.U2 :
1238                                 return br.ReadUInt16 ();
1239                         case ElementType.U4 :
1240                                 return br.ReadUInt32 ();
1241                         case ElementType.U8 :
1242                                 return br.ReadUInt64 ();
1243                         case ElementType.R4 :
1244                                 return br.ReadSingle ();
1245                         case ElementType.R8 :
1246                                 return br.ReadDouble ();
1247                         default:
1248                                 throw new ReflectionException ("Non valid element in constant table");
1249                         }
1250                 }
1251
1252                 protected void SetInitialValue (FieldDefinition field)
1253                 {
1254                         int size = 0;
1255                         TypeReference fieldType = field.FieldType;
1256                         switch (fieldType.FullName) {
1257                         case Constants.Boolean:
1258                         case Constants.Byte:
1259                         case Constants.SByte:
1260                                 size = 1;
1261                                 break;
1262                         case Constants.Int16:
1263                         case Constants.UInt16:
1264                         case Constants.Char:
1265                                 size = 2;
1266                                 break;
1267                         case Constants.Int32:
1268                         case Constants.UInt32:
1269                         case Constants.Single:
1270                                 size = 4;
1271                                 break;
1272                         case Constants.Int64:
1273                         case Constants.UInt64:
1274                         case Constants.Double:
1275                                 size = 8;
1276                                 break;
1277                         default:
1278                                 fieldType = fieldType.GetOriginalType ();
1279
1280                                 TypeDefinition fieldTypeDef = fieldType as TypeDefinition;
1281
1282                                 if (fieldTypeDef != null)
1283                                         size = (int) fieldTypeDef.ClassSize;
1284                                 break;
1285                         }
1286
1287                         if (size > 0 && field.RVA != RVA.Zero) {
1288                                 byte [] data = new byte [size];
1289                                 Section sect = m_reader.Image.GetSectionAtVirtualAddress (field.RVA);
1290                                 if (sect != null)
1291                                         Buffer.BlockCopy (sect.Data, (int) (long) (field.RVA - sect.VirtualAddress), data, 0, size);
1292                                 field.InitialValue = data;
1293                         } else
1294                                 field.InitialValue = new byte [0];
1295                 }
1296         }
1297 }