mcs/mcs/attribute.cs

   1 //
   2 // attribute.cs: Attribute Handler
   3 //
   4 // Author: Ravi Pratap (ravi@ximian.com)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // Licensed under the terms of the GNU GPL
   8 //
   9 // (C) 2001 Ximian, Inc (http://www.ximian.com)
  10 //
  11 //
  12
  13 using System;
  14 using System.Diagnostics;
  15 using System.Collections;
  16 using System.Collections.Specialized;
  17 using System.Reflection;
  18 using System.Reflection.Emit;
  19 using System.Runtime.InteropServices;
  20 using System.Runtime.CompilerServices;
  21 using System.Security;
  22 using System.Security.Permissions;
  23 using System.Text;
  24 using System.IO;
  25
  26 namespace Mono.CSharp {
  27
  28         /// <summary>
  29         ///   Base class for objects that can have Attributes applied to them.
  30         /// </summary>
  31         public abstract class Attributable {
  32                 /// <summary>
  33                 ///   Attributes for this type
  34                 /// </summary>
  35                 protected Attributes attributes;
  36
  37                 public Attributable (Attributes attrs)
  38                 {
  39                         if (attrs != null)
  40                                 OptAttributes = attrs;
  41                 }
  42
  43                 public Attributes OptAttributes
  44                 {
  45                         get {
  46                                 return attributes;
  47                         }
  48                         set {
  49                                 attributes = value;
  50
  51                                 if (attributes != null) {
  52                                         attributes.AttachTo (this);
  53                                 }
  54                         }
  55                 }
  56
  57                 /// <summary>
  58                 /// Use member-specific procedure to apply attribute @a in @cb to the entity being built in @builder
  59                 /// </summary>
  60                 public abstract void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb);
  61
  62                 /// <summary>
  63                 /// Returns one AttributeTarget for this element.
  64                 /// </summary>
  65                 public abstract AttributeTargets AttributeTargets { get; }
  66
  67                 public abstract IResolveContext ResolveContext { get; }
  68
  69                 public abstract bool IsClsComplianceRequired ();
  70
  71                 /// <summary>
  72                 /// Gets list of valid attribute targets for explicit target declaration.
  73                 /// The first array item is default target. Don't break this rule.
  74                 /// </summary>
  75                 public abstract string[] ValidAttributeTargets { get; }
  76         };
  77
  78         public class Attribute {
  79                 public readonly string ExplicitTarget;
  80                 public AttributeTargets Target;
  81
  82                 // TODO: remove this member
  83                 public readonly string    Name;
  84                 public readonly Expression LeftExpr;
  85                 public readonly string Identifier;
  86
  87                 readonly ArrayList PosArguments;
  88                 readonly ArrayList NamedArguments;
  89
  90                 public readonly Location Location;
  91
  92                 public Type Type;
  93
  94                 bool resolve_error;
  95                 readonly bool nameEscaped;
  96
  97                 // It can contain more onwers when the attribute is applied to multiple fiels.
  98                 Attributable[] owners;
  99
 100                 static readonly AttributeUsageAttribute DefaultUsageAttribute = new AttributeUsageAttribute (AttributeTargets.All);
 101                 static Assembly orig_sec_assembly;
 102                 public static readonly object[] EmptyObject = new object [0];
 103
 104                 // non-null if named args present after Resolve () is called
 105                 PropertyInfo [] prop_info_arr;
 106                 FieldInfo [] field_info_arr;
 107                 object [] field_values_arr;
 108                 object [] prop_values_arr;
 109                 object [] pos_values;
 110
 111                 static PtrHashtable usage_attr_cache;
 112                 // Cache for parameter-less attributes
 113                 static PtrHashtable att_cache;
 114
 115                 public Attribute (string target, Expression left_expr, string identifier, object[] args, Location loc, bool nameEscaped)
 116                 {
 117                         LeftExpr = left_expr;
 118                         Identifier = identifier;
 119                         Name = LeftExpr == null ? identifier : LeftExpr + "." + identifier;
 120                         if (args != null) {
 121                                 PosArguments = (ArrayList)args [0];
 122                                 NamedArguments = (ArrayList)args [1];
 123                         }
 124                         Location = loc;
 125                         ExplicitTarget = target;
 126                         this.nameEscaped = nameEscaped;
 127                 }
 128
 129                 static Attribute ()
 130                 {
 131                         Reset ();
 132                 }
 133
 134                 public static void Reset ()
 135                 {
 136                         usage_attr_cache = new PtrHashtable ();
 137                         att_cache = new PtrHashtable ();
 138                 }
 139
 140                 public void AttachTo (Attributable owner)
 141                 {
 142                         if (this.owners == null) {
 143                                 this.owners = new Attributable[1] { owner };
 144                                 return;
 145                         }
 146
 147                         // When the same attribute is attached to multiple fiels
 148                         // we use this extra_owners as a list of owners. The attribute
 149                         // then can be removed because will be emitted when first owner
 150                         // is served
 151                         Attributable[] new_array = new Attributable [this.owners.Length + 1];
 152                         owners.CopyTo (new_array, 0);
 153                         new_array [owners.Length] = owner;
 154                         this.owners = new_array;
 155                         owner.OptAttributes = null;
 156                 }
 157
 158                 void Error_InvalidNamedArgument (string name)
 159                 {
 160                         Report.Error (617, Location, "`{0}' is not a valid named attribute argument. Named attribute arguments " +
 161                                       "must be fields which are not readonly, static, const or read-write properties which are " +
 162                                       "public and not static",
 163                               name);
 164                 }
 165
 166                 void Error_InvalidNamedAgrumentType (string name)
 167                 {
 168                         Report.Error (655, Location, "`{0}' is not a valid named attribute argument because it is not a valid " +
 169                                       "attribute parameter type", name);
 170                 }
 171
 172                 public static void Error_AttributeArgumentNotValid (Location loc)
 173                 {
 174                         Report.Error (182, loc,
 175                                       "An attribute argument must be a constant expression, typeof " +
 176                                       "expression or array creation expression");
 177                 }
 178
 179                 static void Error_TypeParameterInAttribute (Location loc)
 180                 {
 181                         Report.Error (
 182                                 -202, loc, "Can not use a type parameter in an attribute");
 183                 }
 184
 185                 public void Error_MissingGuidAttribute ()
 186                 {
 187                         Report.Error (596, Location, "The Guid attribute must be specified with the ComImport attribute");
 188                 }
 189
 190                 public void Error_MisusedExtensionAttribute ()
 191                 {
 192                         //Report.Error (1112, Location, "Do not use `{0}' directly. Use parameter modifier `this' instead", GetSignatureForError ());
 193                 }
 194
 195                 /// <summary>
 196                 /// This is rather hack. We report many emit attribute error with same error to be compatible with
 197                 /// csc. But because csc has to report them this way because error came from ilasm we needn't.
 198                 /// </summary>
 199                 public void Error_AttributeEmitError (string inner)
 200                 {
 201                         Report.Error (647, Location, "Error during emitting `{0}' attribute. The reason is `{1}'",
 202                                       TypeManager.CSharpName (Type), inner);
 203                 }
 204
 205                 public void Error_InvalidSecurityParent ()
 206                 {
 207                         Error_AttributeEmitError ("it is attached to invalid parent");
 208                 }
 209
 210                 Attributable Owner {
 211                         get {
 212                                 return owners [0];
 213                         }
 214                 }
 215
 216                 protected virtual TypeExpr ResolveAsTypeTerminal (Expression expr, IResolveContext ec, bool silent)
 217                 {
 218                         return expr.ResolveAsTypeTerminal (ec, silent);
 219                 }
 220
 221                 Type ResolvePossibleAttributeType (string name, bool silent, ref bool is_attr)
 222                 {
 223                         IResolveContext rc = Owner.ResolveContext;
 224
 225                         TypeExpr te;
 226                         if (LeftExpr == null) {
 227                                 te = ResolveAsTypeTerminal (new SimpleName (name, Location), rc, silent);
 228                         } else {
 229                                 te = ResolveAsTypeTerminal (new MemberAccess (LeftExpr, name), rc, silent);
 230                         }
 231
 232                         if (te == null)
 233                                 return null;
 234
 235                         Type t = te.Type;
 236                         if (TypeManager.IsSubclassOf (t, TypeManager.attribute_type)) {
 237                                 is_attr = true;
 238                         } else if (!silent) {
 239                                 Report.SymbolRelatedToPreviousError (t);
 240                                 Report.Error (616, Location, "`{0}': is not an attribute class", TypeManager.CSharpName (t));
 241                         }
 242                         return t;
 243                 }
 244
 245                 /// <summary>
 246                 ///   Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.
 247                 /// </summary>
 248                 void ResolveAttributeType ()
 249                 {
 250                         bool t1_is_attr = false;
 251                         Type t1 = ResolvePossibleAttributeType (Identifier, true, ref t1_is_attr);
 252
 253                         bool t2_is_attr = false;
 254                         Type t2 = nameEscaped ? null :
 255                                 ResolvePossibleAttributeType (Identifier + "Attribute", true, ref t2_is_attr);
 256
 257                         if (t1_is_attr && t2_is_attr) {
 258                                 Report.Error (1614, Location, "`{0}' is ambiguous between `{0}' and `{0}Attribute'. " +
 259                                               "Use either `@{0}' or `{0}Attribute'", GetSignatureForError ());
 260                                 resolve_error = true;
 261                                 return;
 262                         }
 263
 264                         if (t1_is_attr) {
 265                                 Type = t1;
 266                                 return;
 267                         }
 268
 269                         if (t2_is_attr) {
 270                                 Type = t2;
 271                                 return;
 272                         }
 273
 274                         if (t1 == null && t2 == null)
 275                                 ResolvePossibleAttributeType (Identifier, false, ref t1_is_attr);
 276                         if (t1 != null)
 277                                 ResolvePossibleAttributeType (Identifier, false, ref t1_is_attr);
 278                         if (t2 != null)
 279                                 ResolvePossibleAttributeType (Identifier + "Attribute", false, ref t2_is_attr);
 280
 281                         resolve_error = true;
 282                 }
 283
 284                 public virtual Type ResolveType ()
 285                 {
 286                         if (Type == null && !resolve_error)
 287                                 ResolveAttributeType ();
 288                         return Type;
 289                 }
 290
 291                 public string GetSignatureForError ()
 292                 {
 293                         if (Type != null)
 294                                 return TypeManager.CSharpName (Type);
 295
 296                         return LeftExpr == null ? Identifier : LeftExpr.GetSignatureForError () + "." + Identifier;
 297                 }
 298
 299                 bool IsValidArgumentType (Type t)
 300                 {
 301                         if (t.IsArray)
 302                                 t = t.GetElementType ();
 303
 304                         return TypeManager.IsPrimitiveType (t) ||
 305                                 TypeManager.IsEnumType (t) ||
 306                                 t == TypeManager.string_type ||
 307                                 t == TypeManager.object_type ||
 308                                 t == TypeManager.type_type;
 309                 }
 310
 311                 public CustomAttributeBuilder Resolve ()
 312                 {
 313                         if (resolve_error)
 314                                 return null;
 315
 316                         resolve_error = true;
 317
 318                         if (Type == null) {
 319                                 ResolveAttributeType ();
 320                                 if (Type == null)
 321                                         return null;
 322                         }
 323
 324                         if (Type.IsAbstract) {
 325                                 Report.Error (653, Location, "Cannot apply attribute class `{0}' because it is abstract", GetSignatureForError ());
 326                                 return null;
 327                         }
 328
 329                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (Type);
 330                         if (obsolete_attr != null) {
 331                                 AttributeTester.Report_ObsoleteMessage (obsolete_attr, TypeManager.CSharpName (Type), Location);
 332                         }
 333
 334                         if (PosArguments == null && NamedArguments == null) {
 335                                 object o = att_cache [Type];
 336                                 if (o != null) {
 337                                         resolve_error = false;
 338                                         return (CustomAttributeBuilder)o;
 339                                 }
 340                         }
 341
 342                         Attributable owner = Owner;
 343                         EmitContext ec = new EmitContext (owner.ResolveContext, owner.ResolveContext.DeclContainer, owner.ResolveContext.DeclContainer,
 344                                 Location, null, null, owner.ResolveContext.DeclContainer.ModFlags, false);
 345                         ec.IsAnonymousMethodAllowed = false;
 346
 347                         ConstructorInfo ctor = ResolveConstructor (ec);
 348                         if (ctor == null) {
 349                                 if (Type is TypeBuilder &&
 350                                     TypeManager.LookupDeclSpace (Type).MemberCache == null)
 351                                         // The attribute type has been DefineType'd, but not Defined.  Let's not treat it as an error.
 352                                         // It'll be resolved again when the attached-to entity is emitted.
 353                                         resolve_error = false;
 354                                 return null;
 355                         }
 356
 357                         CustomAttributeBuilder cb;
 358
 359                         try {
 360                                 if (NamedArguments == null) {
 361                                         cb = new CustomAttributeBuilder (ctor, pos_values);
 362
 363                                         if (pos_values.Length == 0)
 364                                                 att_cache.Add (Type, cb);
 365
 366                                         resolve_error = false;
 367                                         return cb;
 368                                 }
 369
 370                                 if (!ResolveNamedArguments (ec)) {
 371                                         return null;
 372                                 }
 373
 374                                 cb = new CustomAttributeBuilder (ctor, pos_values,
 375                                                 prop_info_arr, prop_values_arr,
 376                                                 field_info_arr, field_values_arr);
 377
 378                                 resolve_error = false;
 379                                 return cb;
 380                         }
 381                         catch (Exception) {
 382                                 Error_AttributeArgumentNotValid (Location);
 383                                 return null;
 384                         }
 385                 }
 386
 387                 protected virtual ConstructorInfo ResolveConstructor (EmitContext ec)
 388                 {
 389                         if (PosArguments != null) {
 390                                 for (int i = 0; i < PosArguments.Count; i++) {
 391                                         Argument a = (Argument) PosArguments [i];
 392
 393                                         if (!a.Resolve (ec, Location))
 394                                                 return null;
 395                                 }
 396                         }
 397
 398                         Expression mg = Expression.MemberLookup (ec.ContainerType,
 399                                 Type, ".ctor", MemberTypes.Constructor,
 400                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
 401                                 Location);
 402
 403                         if (mg == null)
 404                                 return null;
 405
 406                         MethodBase constructor = ((MethodGroupExpr)mg).OverloadResolve (
 407                                 ec, PosArguments, false, Location);
 408
 409                         if (constructor == null)
 410                                 return null;
 411
 412                         ObsoleteAttribute oa = AttributeTester.GetMethodObsoleteAttribute (constructor);
 413                         if (oa != null && !Owner.ResolveContext.IsInObsoleteScope) {
 414                                 AttributeTester.Report_ObsoleteMessage (oa, mg.GetSignatureForError (), mg.Location);
 415                         }
 416
 417                         if (PosArguments == null) {
 418                                 pos_values = EmptyObject;
 419                                 return (ConstructorInfo)constructor;
 420                         }
 421
 422                         ParameterData pd = TypeManager.GetParameterData (constructor);
 423
 424                         int pos_arg_count = PosArguments.Count;
 425                         int last_real_param = pd.Count;
 426
 427                         pos_values = new object [pos_arg_count];
 428
 429                         if (pd.HasParams) {
 430                                 // When the params is not filled we need to put one
 431                                 if (last_real_param > pos_arg_count) {
 432                                         object [] new_pos_values = new object [pos_arg_count + 1];
 433                                         pos_values.CopyTo (new_pos_values, 0);
 434                                         new_pos_values [pos_arg_count] = new object [] {} ;
 435                                         pos_values = new_pos_values;
 436                                 }
 437                                 last_real_param--;
 438                         }
 439
 440                         for (int j = 0; j < pos_arg_count; ++j) {
 441                                 Argument a = (Argument) PosArguments [j];
 442
 443                                 if (!a.Expr.GetAttributableValue (a.Type, out pos_values [j]))
 444                                         return null;
 445
 446                                 if (j < last_real_param)
 447                                         continue;
 448
 449                                 if (j == last_real_param) {
 450                                         object [] array = new object [pos_arg_count - last_real_param];
 451                                         array [0] = pos_values [j];
 452                                         pos_values [j] = array;
 453                                         continue;
 454                                 }
 455
 456                                 object [] params_array = (object []) pos_values [last_real_param];
 457                                 params_array [j - last_real_param] = pos_values [j];
 458                         }
 459
 460                         // Adjust the size of the pos_values if it had params
 461                         if (last_real_param != pos_arg_count) {
 462                                 object [] new_pos_values = new object [last_real_param + 1];
 463                                 Array.Copy (pos_values, new_pos_values, last_real_param + 1);
 464                                 pos_values = new_pos_values;
 465                         }
 466
 467                         // Here we do the checks which should be done by corlib or by runtime.
 468                         // However Zoltan doesn't like it and every Mono compiler has to do it again.
 469
 470                         if (Type == TypeManager.guid_attr_type) {
 471                                 try {
 472                                         new Guid ((string)pos_values [0]);
 473                                 }
 474                                 catch (Exception e) {
 475                                         Error_AttributeEmitError (e.Message);
 476                                         return null;
 477                                 }
 478                         }
 479
 480                         if (Type == TypeManager.attribute_usage_type && (int)pos_values [0] == 0) {
 481                                 Report.Error (591, Location, "Invalid value for argument to `System.AttributeUsage' attribute");
 482                                 return null;
 483                         }
 484
 485                         if (Type == TypeManager.indexer_name_type || Type == TypeManager.conditional_attribute_type) {
 486                                 if (!Tokenizer.IsValidIdentifier ((string)pos_values [0])) {
 487                                         Report.Error (633, ((Argument)PosArguments[0]).Expr.Location,
 488                                                 "The argument to the `{0}' attribute must be a valid identifier", GetSignatureForError ());
 489                                         return null;
 490                                 }
 491                         }
 492
 493                         if (Type == TypeManager.methodimpl_attr_type && pos_values.Length == 1 &&
 494                                 pd.ParameterType (0) == TypeManager.short_type &&
 495                                 !System.Enum.IsDefined (typeof (MethodImplOptions), pos_values [0].ToString ())) {
 496                                 Error_AttributeEmitError ("Incorrect argument value.");
 497                                 return null;
 498                         }
 499
 500                         return (ConstructorInfo)constructor;
 501                 }
 502
 503                 protected virtual bool ResolveNamedArguments (EmitContext ec)
 504                 {
 505                         int named_arg_count = NamedArguments.Count;
 506
 507                         ArrayList field_infos = new ArrayList (named_arg_count);
 508                         ArrayList prop_infos  = new ArrayList (named_arg_count);
 509                         ArrayList field_values = new ArrayList (named_arg_count);
 510                         ArrayList prop_values = new ArrayList (named_arg_count);
 511
 512                         ArrayList seen_names = new ArrayList(named_arg_count);
 513
 514                         foreach (DictionaryEntry de in NamedArguments) {
 515                                 string member_name = (string) de.Key;
 516
 517                                 if (seen_names.Contains(member_name)) {
 518                                         Report.Error(643, Location, "'" + member_name + "' duplicate named attribute argument");
 519                                         return false;
 520                                 }
 521                                 seen_names.Add(member_name);
 522
 523                                 Argument a = (Argument) de.Value;
 524                                 if (!a.Resolve (ec, Location))
 525                                         return false;
 526
 527                                 Expression member = Expression.MemberLookup (
 528                                         ec.ContainerType, Type, member_name,
 529                                         MemberTypes.Field | MemberTypes.Property,
 530                                         BindingFlags.Public | BindingFlags.Instance,
 531                                         Location);
 532
 533                                 if (member == null) {
 534                                         member = Expression.MemberLookup (ec.ContainerType, Type, member_name,
 535                                                 MemberTypes.Field | MemberTypes.Property, BindingFlags.NonPublic | BindingFlags.Instance,
 536                                                 Location);
 537
 538                                         if (member != null) {
 539                                                 Report.SymbolRelatedToPreviousError (member.Type);
 540                                                 Expression.ErrorIsInaccesible (Location, member.GetSignatureForError ());
 541                                                 return false;
 542                                         }
 543                                 }
 544
 545                                 if (member == null){
 546                                         Expression.Error_TypeDoesNotContainDefinition (Location, Type, member_name);
 547                                         return false;
 548                                 }
 549
 550                                 if (!(member is PropertyExpr || member is FieldExpr)) {
 551                                         Error_InvalidNamedArgument (member_name);
 552                                         return false;
 553                                 }
 554
 555                                 if (a.Expr is TypeParameterExpr){
 556                                         Error_TypeParameterInAttribute (Location);
 557                                         return false;
 558                                 }
 559
 560                                 ObsoleteAttribute obsolete_attr;
 561
 562                                 if (member is PropertyExpr) {
 563                                         PropertyInfo pi = ((PropertyExpr) member).PropertyInfo;
 564
 565                                         if (!pi.CanWrite || !pi.CanRead) {
 566                                                 Report.SymbolRelatedToPreviousError (pi);
 567                                                 Error_InvalidNamedArgument (member_name);
 568                                                 return false;
 569                                         }
 570
 571                                         if (!IsValidArgumentType (pi.PropertyType)) {
 572                                                 Report.SymbolRelatedToPreviousError (pi);
 573                                                 Error_InvalidNamedAgrumentType (member_name);
 574                                                 return false;
 575                                         }
 576
 577                                         object value;
 578                                         if (!a.Expr.GetAttributableValue (pi.PropertyType, out value))
 579                                                 return false;
 580
 581                                         PropertyBase pb = TypeManager.GetProperty (pi);
 582                                         if (pb != null)
 583                                                 obsolete_attr = pb.GetObsoleteAttribute ();
 584                                         else
 585                                                 obsolete_attr = AttributeTester.GetMemberObsoleteAttribute (pi);
 586
 587                                         prop_values.Add (value);
 588                                         prop_infos.Add (pi);
 589
 590                                 } else {
 591                                         FieldInfo fi = ((FieldExpr) member).FieldInfo;
 592
 593                                         if (fi.IsInitOnly) {
 594                                                 Error_InvalidNamedArgument (member_name);
 595                                                 return false;
 596                                         }
 597
 598                                         if (!IsValidArgumentType (fi.FieldType)) {
 599                                                 Report.SymbolRelatedToPreviousError (fi);
 600                                                 Error_InvalidNamedAgrumentType (member_name);
 601                                                 return false;
 602                                         }
 603
 604                                         object value;
 605                                         if (!a.Expr.GetAttributableValue (fi.FieldType, out value))
 606                                                 return false;
 607
 608                                         FieldBase fb = TypeManager.GetField (fi);
 609                                         if (fb != null)
 610                                                 obsolete_attr = fb.GetObsoleteAttribute ();
 611                                         else
 612                                                 obsolete_attr = AttributeTester.GetMemberObsoleteAttribute (fi);
 613
 614                                         field_values.Add (value);
 615                                         field_infos.Add (fi);
 616                                 }
 617
 618                                 if (obsolete_attr != null && !Owner.ResolveContext.IsInObsoleteScope)
 619                                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, member.GetSignatureForError (), member.Location);
 620                         }
 621
 622                         prop_info_arr = new PropertyInfo [prop_infos.Count];
 623                         field_info_arr = new FieldInfo [field_infos.Count];
 624                         field_values_arr = new object [field_values.Count];
 625                         prop_values_arr = new object [prop_values.Count];
 626
 627                         field_infos.CopyTo  (field_info_arr, 0);
 628                         field_values.CopyTo (field_values_arr, 0);
 629
 630                         prop_values.CopyTo  (prop_values_arr, 0);
 631                         prop_infos.CopyTo   (prop_info_arr, 0);
 632
 633                         return true;
 634                 }
 635
 636                 /// <summary>
 637                 ///   Get a string containing a list of valid targets for the attribute 'attr'
 638                 /// </summary>
 639                 public string GetValidTargets ()
 640                 {
 641                         StringBuilder sb = new StringBuilder ();
 642                         AttributeTargets targets = GetAttributeUsage ().ValidOn;
 643
 644                         if ((targets & AttributeTargets.Assembly) != 0)
 645                                 sb.Append ("assembly, ");
 646
 647                         if ((targets & AttributeTargets.Module) != 0)
 648                                 sb.Append ("module, ");
 649
 650                         if ((targets & AttributeTargets.Class) != 0)
 651                                 sb.Append ("class, ");
 652
 653                         if ((targets & AttributeTargets.Struct) != 0)
 654                                 sb.Append ("struct, ");
 655
 656                         if ((targets & AttributeTargets.Enum) != 0)
 657                                 sb.Append ("enum, ");
 658
 659                         if ((targets & AttributeTargets.Constructor) != 0)
 660                                 sb.Append ("constructor, ");
 661
 662                         if ((targets & AttributeTargets.Method) != 0)
 663                                 sb.Append ("method, ");
 664
 665                         if ((targets & AttributeTargets.Property) != 0)
 666                                 sb.Append ("property, indexer, ");
 667
 668                         if ((targets & AttributeTargets.Field) != 0)
 669                                 sb.Append ("field, ");
 670
 671                         if ((targets & AttributeTargets.Event) != 0)
 672                                 sb.Append ("event, ");
 673
 674                         if ((targets & AttributeTargets.Interface) != 0)
 675                                 sb.Append ("interface, ");
 676
 677                         if ((targets & AttributeTargets.Parameter) != 0)
 678                                 sb.Append ("parameter, ");
 679
 680                         if ((targets & AttributeTargets.Delegate) != 0)
 681                                 sb.Append ("delegate, ");
 682
 683                         if ((targets & AttributeTargets.ReturnValue) != 0)
 684                                 sb.Append ("return, ");
 685
 686 #if NET_2_0
 687                         if ((targets & AttributeTargets.GenericParameter) != 0)
 688                                 sb.Append ("type parameter, ");
 689 #endif
 690                         return sb.Remove (sb.Length - 2, 2).ToString ();
 691                 }
 692
 693                 /// <summary>
 694                 /// Returns AttributeUsage attribute for this type
 695                 /// </summary>
 696                 AttributeUsageAttribute GetAttributeUsage ()
 697                 {
 698                         AttributeUsageAttribute ua = usage_attr_cache [Type] as AttributeUsageAttribute;
 699                         if (ua != null)
 700                                 return ua;
 701
 702                         Class attr_class = TypeManager.LookupClass (Type);
 703
 704                         if (attr_class == null) {
 705                                 object[] usage_attr = Type.GetCustomAttributes (TypeManager.attribute_usage_type, true);
 706                                 ua = (AttributeUsageAttribute)usage_attr [0];
 707                                 usage_attr_cache.Add (Type, ua);
 708                                 return ua;
 709                         }
 710
 711                         Attribute a = attr_class.OptAttributes == null
 712                                 ? null
 713                                 : attr_class.OptAttributes.Search (TypeManager.attribute_usage_type);
 714
 715                         ua = a == null
 716                                 ? DefaultUsageAttribute
 717                                 : a.GetAttributeUsageAttribute ();
 718
 719                         usage_attr_cache.Add (Type, ua);
 720                         return ua;
 721                 }
 722
 723                 AttributeUsageAttribute GetAttributeUsageAttribute ()
 724                 {
 725                         if (pos_values == null)
 726                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 727                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 728                                 Resolve ();
 729
 730                         if (resolve_error)
 731                                 return DefaultUsageAttribute;
 732
 733                         AttributeUsageAttribute usage_attribute = new AttributeUsageAttribute ((AttributeTargets)pos_values [0]);
 734
 735                         object field = GetPropertyValue ("AllowMultiple");
 736                         if (field != null)
 737                                 usage_attribute.AllowMultiple = (bool)field;
 738
 739                         field = GetPropertyValue ("Inherited");
 740                         if (field != null)
 741                                 usage_attribute.Inherited = (bool)field;
 742
 743                         return usage_attribute;
 744                 }
 745
 746                 /// <summary>
 747                 /// Returns custom name of indexer
 748                 /// </summary>
 749                 public string GetIndexerAttributeValue ()
 750                 {
 751                         if (pos_values == null)
 752                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 753                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 754                                 Resolve ();
 755
 756                         if (resolve_error)
 757                                 return null;
 758
 759                         return pos_values [0] as string;
 760                 }
 761
 762                 /// <summary>
 763                 /// Returns condition of ConditionalAttribute
 764                 /// </summary>
 765                 public string GetConditionalAttributeValue ()
 766                 {
 767                         if (pos_values == null)
 768                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 769                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 770                                 Resolve ();
 771
 772                         if (resolve_error)
 773                                 return null;
 774
 775                         return (string)pos_values [0];
 776                 }
 777
 778                 /// <summary>
 779                 /// Creates the instance of ObsoleteAttribute from this attribute instance
 780                 /// </summary>
 781                 public ObsoleteAttribute GetObsoleteAttribute ()
 782                 {
 783                         if (pos_values == null)
 784                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 785                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 786                                 Resolve ();
 787
 788                         if (resolve_error)
 789                                 return null;
 790
 791                         if (pos_values == null || pos_values.Length == 0)
 792                                 return new ObsoleteAttribute ();
 793
 794                         if (pos_values.Length == 1)
 795                                 return new ObsoleteAttribute ((string)pos_values [0]);
 796
 797                         return new ObsoleteAttribute ((string)pos_values [0], (bool)pos_values [1]);
 798                 }
 799
 800                 /// <summary>
 801                 /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
 802                 /// before ApplyAttribute. We need to resolve the arguments.
 803                 /// This situation occurs when class deps is differs from Emit order.
 804                 /// </summary>
 805                 public bool GetClsCompliantAttributeValue ()
 806                 {
 807                         if (pos_values == null)
 808                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 809                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 810                                 Resolve ();
 811
 812                         if (resolve_error)
 813                                 return false;
 814
 815                         return (bool)pos_values [0];
 816                 }
 817
 818                 public Type GetCoClassAttributeValue ()
 819                 {
 820                         if (pos_values == null)
 821                                 Resolve ();
 822
 823                         if (resolve_error)
 824                                 return null;
 825
 826                         return (Type)pos_values [0];
 827                 }
 828
 829                 public bool CheckTarget ()
 830                 {
 831                         string[] valid_targets = Owner.ValidAttributeTargets;
 832                         if (ExplicitTarget == null || ExplicitTarget == valid_targets [0]) {
 833                                 Target = Owner.AttributeTargets;
 834                                 return true;
 835                         }
 836
 837                         // TODO: we can skip the first item
 838                         if (((IList) valid_targets).Contains (ExplicitTarget)) {
 839                                 switch (ExplicitTarget) {
 840                                         case "return": Target = AttributeTargets.ReturnValue; return true;
 841                                         case "param": Target = AttributeTargets.Parameter; return true;
 842                                         case "field": Target = AttributeTargets.Field; return true;
 843                                         case "method": Target = AttributeTargets.Method; return true;
 844                                         case "property": Target = AttributeTargets.Property; return true;
 845                                 }
 846                                 throw new InternalErrorException ("Unknown explicit target: " + ExplicitTarget);
 847                         }
 848
 849                         StringBuilder sb = new StringBuilder ();
 850                         foreach (string s in valid_targets) {
 851                                 sb.Append (s);
 852                                 sb.Append (", ");
 853                         }
 854                         sb.Remove (sb.Length - 2, 2);
 855                         Report.Error (657, Location, "`{0}' is not a valid attribute location for this declaration. " +
 856                                 "Valid attribute locations for this declaration are `{1}'", ExplicitTarget, sb.ToString ());
 857                         return false;
 858                 }
 859
 860                 /// <summary>
 861                 /// Tests permitted SecurityAction for assembly or other types
 862                 /// </summary>
 863                 public bool CheckSecurityActionValidity (bool for_assembly)
 864                 {
 865                         SecurityAction action = GetSecurityActionValue ();
 866
 867                         switch (action) {
 868                         case SecurityAction.Demand:
 869                         case SecurityAction.Assert:
 870                         case SecurityAction.Deny:
 871                         case SecurityAction.PermitOnly:
 872                         case SecurityAction.LinkDemand:
 873                         case SecurityAction.InheritanceDemand:
 874                                 if (!for_assembly)
 875                                         return true;
 876                                 break;
 877
 878                         case SecurityAction.RequestMinimum:
 879                         case SecurityAction.RequestOptional:
 880                         case SecurityAction.RequestRefuse:
 881                                 if (for_assembly)
 882                                         return true;
 883                                 break;
 884
 885                         default:
 886                                 Error_AttributeEmitError ("SecurityAction is out of range");
 887                                 return false;
 888                         }
 889
 890                         Error_AttributeEmitError (String.Concat ("SecurityAction `", action, "' is not valid for this declaration"));
 891                         return false;
 892                 }
 893
 894                 System.Security.Permissions.SecurityAction GetSecurityActionValue ()
 895                 {
 896                         return (SecurityAction)pos_values [0];
 897                 }
 898
 899                 /// <summary>
 900                 /// Creates instance of SecurityAttribute class and add result of CreatePermission method to permission table.
 901                 /// </summary>
 902                 /// <returns></returns>
 903                 public void ExtractSecurityPermissionSet (ListDictionary permissions)
 904                 {
 905                         Type orig_assembly_type = null;
 906
 907                         if (TypeManager.LookupDeclSpace (Type) != null) {
 908                                 if (!RootContext.StdLib) {
 909                                         orig_assembly_type = Type.GetType (Type.FullName);
 910                                 } else {
 911                                         string orig_version_path = Environment.GetEnvironmentVariable ("__SECURITY_BOOTSTRAP_DB");
 912                                         if (orig_version_path == null) {
 913                                                 Error_AttributeEmitError ("security custom attributes can not be referenced from defining assembly");
 914                                                 return;
 915                                         }
 916
 917                                         if (orig_sec_assembly == null) {
 918                                                 string file = Path.Combine (orig_version_path, Driver.OutputFile);
 919                                                 orig_sec_assembly = Assembly.LoadFile (file);
 920                                         }
 921
 922                                         orig_assembly_type = orig_sec_assembly.GetType (Type.FullName, true);
 923                                         if (orig_assembly_type == null) {
 924                                                 Report.Warning (-112, 1, Location, "Self-referenced security attribute `{0}' " +
 925                                                                 "was not found in previous version of assembly");
 926                                                 return;
 927                                         }
 928                                 }
 929                         }
 930
 931                         SecurityAttribute sa;
 932                         // For all non-selfreferencing security attributes we can avoid all hacks
 933                         if (orig_assembly_type == null) {
 934                                 sa = (SecurityAttribute) Activator.CreateInstance (Type, pos_values);
 935
 936                                 if (prop_info_arr != null) {
 937                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 938                                                 PropertyInfo pi = prop_info_arr [i];
 939                                                 pi.SetValue (sa, prop_values_arr [i], null);
 940                                         }
 941                                 }
 942                         } else {
 943                                 // HACK: All security attributes have same ctor syntax
 944                                 sa = (SecurityAttribute) Activator.CreateInstance (orig_assembly_type, new object[] { GetSecurityActionValue () } );
 945
 946                                 // All types are from newly created assembly but for invocation with old one we need to convert them
 947                                 if (prop_info_arr != null) {
 948                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 949                                                 PropertyInfo emited_pi = prop_info_arr [i];
 950                                                 PropertyInfo pi = orig_assembly_type.GetProperty (emited_pi.Name, emited_pi.PropertyType);
 951
 952                                                 object old_instance = pi.PropertyType.IsEnum ?
 953                                                         System.Enum.ToObject (pi.PropertyType, prop_values_arr [i]) :
 954                                                         prop_values_arr [i];
 955
 956                                                 pi.SetValue (sa, old_instance, null);
 957                                         }
 958                                 }
 959                         }
 960
 961                         IPermission perm;
 962                         perm = sa.CreatePermission ();
 963                         SecurityAction action = GetSecurityActionValue ();
 964
 965                         // IS is correct because for corlib we are using an instance from old corlib
 966                         if (!(perm is System.Security.CodeAccessPermission)) {
 967                                 switch (action) {
 968                                         case SecurityAction.Demand:
 969                                                 action = (SecurityAction)13;
 970                                                 break;
 971                                         case SecurityAction.LinkDemand:
 972                                                 action = (SecurityAction)14;
 973                                                 break;
 974                                         case SecurityAction.InheritanceDemand:
 975                                                 action = (SecurityAction)15;
 976                                                 break;
 977                                 }
 978                         }
 979
 980                         PermissionSet ps = (PermissionSet)permissions [action];
 981                         if (ps == null) {
 982                                 if (sa is PermissionSetAttribute)
 983                                         ps = new PermissionSet (sa.Unrestricted ? PermissionState.Unrestricted : PermissionState.None);
 984                                 else
 985                                         ps = new PermissionSet (PermissionState.None);
 986
 987                                 permissions.Add (action, ps);
 988                         } else if (!ps.IsUnrestricted () && (sa is PermissionSetAttribute) && sa.Unrestricted) {
 989                                 ps = ps.Union (new PermissionSet (PermissionState.Unrestricted));
 990                                 permissions [action] = ps;
 991                         }
 992                         ps.AddPermission (perm);
 993                 }
 994
 995                 static object GetValue (object value)
 996                 {
 997                         if (value is EnumConstant)
 998                                 return ((EnumConstant) value).GetValue ();
 999                         else
1000                                 return value;
1001                 }
1002
1003                 public object GetPropertyValue (string name)
1004                 {
1005                         if (prop_info_arr == null)
1006                                 return null;
1007
1008                         for (int i = 0; i < prop_info_arr.Length; ++i) {
1009                                 if (prop_info_arr [i].Name == name)
1010                                         return prop_values_arr [i];
1011                         }
1012
1013                         return null;
1014                 }
1015
1016                 object GetFieldValue (string name)
1017                 {
1018                         int i;
1019                         if (field_info_arr == null)
1020                                 return null;
1021                         i = 0;
1022                         foreach (FieldInfo fi in field_info_arr) {
1023                                 if (fi.Name == name)
1024                                         return GetValue (field_values_arr [i]);
1025                                 i++;
1026                         }
1027                         return null;
1028                 }
1029
1030                 //
1031                 // Theoretically, we can get rid of this, since FieldBuilder.SetCustomAttribute()
1032                 // and ParameterBuilder.SetCustomAttribute() are supposed to handle this attribute.
1033                 // However, we can't, since it appears that the .NET 1.1 SRE hangs when given a MarshalAsAttribute.
1034                 //
1035                 public UnmanagedMarshal GetMarshal (Attributable attr)
1036                 {
1037                         UnmanagedType UnmanagedType;
1038                         if (!RootContext.StdLib || pos_values [0].GetType () != typeof (UnmanagedType))
1039                                 UnmanagedType = (UnmanagedType) System.Enum.ToObject (typeof (UnmanagedType), pos_values [0]);
1040                         else
1041                                 UnmanagedType = (UnmanagedType) pos_values [0];
1042
1043                         object value = GetFieldValue ("SizeParamIndex");
1044                         if (value != null && UnmanagedType != UnmanagedType.LPArray) {
1045                                 Error_AttributeEmitError ("SizeParamIndex field is not valid for the specified unmanaged type");
1046                                 return null;
1047                         }
1048
1049                         object o = GetFieldValue ("ArraySubType");
1050                         UnmanagedType array_sub_type = o == null ? (UnmanagedType) 0x50 /* NATIVE_MAX */ : (UnmanagedType) o;
1051
1052                         switch (UnmanagedType) {
1053                         case UnmanagedType.CustomMarshaler: {
1054                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",
1055                                         BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
1056                                 if (define_custom == null) {
1057                                         Report.RuntimeMissingSupport (Location, "set marshal info");
1058                                         return null;
1059                                 }
1060
1061                                 object [] args = new object [4];
1062                                 args [0] = GetFieldValue ("MarshalTypeRef");
1063                                 args [1] = GetFieldValue ("MarshalCookie");
1064                                 args [2] = GetFieldValue ("MarshalType");
1065                                 args [3] = Guid.Empty;
1066                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);
1067                         }
1068                         case UnmanagedType.LPArray: {
1069                                 object size_const = GetFieldValue ("SizeConst");
1070                                 object size_param_index = GetFieldValue ("SizeParamIndex");
1071
1072                                 if ((size_const != null) || (size_param_index != null)) {
1073                                         MethodInfo define_array = typeof (UnmanagedMarshal).GetMethod ("DefineLPArrayInternal",
1074                                                 BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
1075                                         if (define_array == null) {
1076                                                 Report.RuntimeMissingSupport (Location, "set marshal info");
1077                                                 return null;
1078                                         }
1079
1080                                         object [] args = new object [3];
1081                                         args [0] = array_sub_type;
1082                                         args [1] = size_const == null ? -1 : size_const;
1083                                         args [2] = size_param_index == null ? -1 : size_param_index;
1084                                         return (UnmanagedMarshal) define_array.Invoke (null, args);
1085                                 }
1086                                 else
1087                                         return UnmanagedMarshal.DefineLPArray (array_sub_type);
1088                         }
1089                         case UnmanagedType.SafeArray:
1090                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);
1091
1092                         case UnmanagedType.ByValArray:
1093                                 FieldBase fm = attr as FieldBase;
1094                                 if (fm == null) {
1095                                         Error_AttributeEmitError ("Specified unmanaged type is only valid on fields");
1096                                         return null;
1097                                 }
1098                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue ("SizeConst"));
1099
1100                         case UnmanagedType.ByValTStr:
1101                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue ("SizeConst"));
1102
1103                         default:
1104                                 return UnmanagedMarshal.DefineUnmanagedMarshal (UnmanagedType);
1105                         }
1106                 }
1107
1108                 public CharSet GetCharSetValue ()
1109                 {
1110                         return (CharSet)System.Enum.Parse (typeof (CharSet), pos_values [0].ToString ());
1111                 }
1112
1113                 public MethodImplOptions GetMethodImplOptions ()
1114                 {
1115                         if (pos_values [0].GetType () != typeof (MethodImplOptions))
1116                                 return (MethodImplOptions)System.Enum.ToObject (typeof (MethodImplOptions), pos_values [0]);
1117                         return (MethodImplOptions)pos_values [0];
1118                 }
1119
1120                 public LayoutKind GetLayoutKindValue ()
1121                 {
1122                         if (!RootContext.StdLib || pos_values [0].GetType () != typeof (LayoutKind))
1123                                 return (LayoutKind)System.Enum.ToObject (typeof (LayoutKind), pos_values [0]);
1124
1125                         return (LayoutKind)pos_values [0];
1126                 }
1127
1128                 public object GetParameterDefaultValue ()
1129                 {
1130                         return pos_values [0];
1131                 }
1132
1133                 public override bool Equals (object obj)
1134                 {
1135                         Attribute a = obj as Attribute;
1136                         if (a == null)
1137                                 return false;
1138
1139                         return Type == a.Type && Target == a.Target;
1140                 }
1141
1142                 public override int GetHashCode ()
1143                 {
1144                         return base.GetHashCode ();
1145                 }
1146
1147                 /// <summary>
1148                 /// Emit attribute for Attributable symbol
1149                 /// </summary>
1150                 public void Emit (ListDictionary allEmitted)
1151                 {
1152                         CustomAttributeBuilder cb = Resolve ();
1153                         if (cb == null)
1154                                 return;
1155
1156                         AttributeUsageAttribute usage_attr = GetAttributeUsage ();
1157                         if ((usage_attr.ValidOn & Target) == 0) {
1158                                 Report.Error (592, Location, "The attribute `{0}' is not valid on this declaration type. " +
1159                                               "It is valid on `{1}' declarations only",
1160                                         GetSignatureForError (), GetValidTargets ());
1161                                 return;
1162                         }
1163
1164                         try {
1165                                 foreach (Attributable owner in owners)
1166                                         owner.ApplyAttributeBuilder (this, cb);
1167                         }
1168                         catch (Exception e) {
1169                                 Error_AttributeEmitError (e.Message);
1170                                 return;
1171                         }
1172
1173                         if (!usage_attr.AllowMultiple && allEmitted != null) {
1174                                 if (allEmitted.Contains (this)) {
1175                                         ArrayList a = allEmitted [this] as ArrayList;
1176                                         if (a == null) {
1177                                                 a = new ArrayList (2);
1178                                                 allEmitted [this] = a;
1179                                         }
1180                                         a.Add (this);
1181                                 } else {
1182                                         allEmitted.Add (this, null);
1183                                 }
1184                         }
1185
1186                         if (!RootContext.VerifyClsCompliance)
1187                                 return;
1188
1189                         // Here we are testing attribute arguments for array usage (error 3016)
1190                         if (Owner.IsClsComplianceRequired ()) {
1191                                 if (PosArguments != null) {
1192                                         foreach (Argument arg in PosArguments) {
1193                                                 // Type is undefined (was error 246)
1194                                                 if (arg.Type == null)
1195                                                         return;
1196
1197                                                 if (arg.Type.IsArray) {
1198                                                         Report.Error (3016, Location, "Arrays as attribute arguments are not CLS-compliant");
1199                                                         return;
1200                                                 }
1201                                         }
1202                                 }
1203
1204                                 if (NamedArguments == null)
1205                                         return;
1206
1207                                 foreach (DictionaryEntry de in NamedArguments) {
1208                                         Argument arg  = (Argument) de.Value;
1209
1210                                         // Type is undefined (was error 246)
1211                                         if (arg.Type == null)
1212                                                 return;
1213
1214                                         if (arg.Type.IsArray) {
1215                                                 Report.Error (3016, Location, "Arrays as attribute arguments are not CLS-compliant");
1216                                                 return;
1217                                         }
1218                                 }
1219                         }
1220                 }
1221
1222                 public MethodBuilder DefinePInvokeMethod (TypeBuilder builder, string name,
1223                                                           MethodAttributes flags, IMethodData method, Type [] param_types)
1224                 {
1225                         if (pos_values == null)
1226                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
1227                                 // But because a lot of attribute class code must be rewritten will be better to wait...
1228                                 Resolve ();
1229
1230                         if (resolve_error)
1231                                 return null;
1232
1233                         string dll_name = (string)pos_values [0];
1234
1235                         // Default settings
1236                         CallingConvention cc = CallingConvention.Winapi;
1237                         CharSet charset = CodeGen.Module.DefaultCharSet;
1238                         bool preserve_sig = true;
1239                         string entry_point = name;
1240                         bool best_fit_mapping = false;
1241                         bool throw_on_unmappable = false;
1242                         bool exact_spelling = false;
1243                         bool set_last_error = false;
1244
1245                         bool best_fit_mapping_set = false;
1246                         bool throw_on_unmappable_set = false;
1247                         bool exact_spelling_set = false;
1248                         bool set_last_error_set = false;
1249
1250                         MethodInfo set_best_fit = null;
1251                         MethodInfo set_throw_on = null;
1252                         MethodInfo set_exact_spelling = null;
1253                         MethodInfo set_set_last_error = null;
1254
1255                         if (field_info_arr != null) {
1256
1257                                 for (int i = 0; i < field_info_arr.Length; i++) {
1258                                         switch (field_info_arr [i].Name) {
1259                                         case "BestFitMapping":
1260                                                 best_fit_mapping = (bool) field_values_arr [i];
1261                                                 best_fit_mapping_set = true;
1262                                                 break;
1263                                         case "CallingConvention":
1264                                                 cc = (CallingConvention) field_values_arr [i];
1265                                                 break;
1266                                         case "CharSet":
1267                                                 charset = (CharSet) field_values_arr [i];
1268                                                 break;
1269                                         case "EntryPoint":
1270                                                 entry_point = (string) field_values_arr [i];
1271                                                 break;
1272                                         case "ExactSpelling":
1273                                                 exact_spelling = (bool) field_values_arr [i];
1274                                                 exact_spelling_set = true;
1275                                                 break;
1276                                         case "PreserveSig":
1277                                                 preserve_sig = (bool) field_values_arr [i];
1278                                                 break;
1279                                         case "SetLastError":
1280                                                 set_last_error = (bool) field_values_arr [i];
1281                                                 set_last_error_set = true;
1282                                                 break;
1283                                         case "ThrowOnUnmappableChar":
1284                                                 throw_on_unmappable = (bool) field_values_arr [i];
1285                                                 throw_on_unmappable_set = true;
1286                                                 break;
1287                                         default:
1288                                                 throw new InternalErrorException (field_info_arr [i].ToString ());
1289                                         }
1290                                 }
1291                         }
1292
1293                         if (throw_on_unmappable_set || best_fit_mapping_set || exact_spelling_set || set_last_error_set) {
1294                                 set_best_fit = typeof (MethodBuilder).
1295                                         GetMethod ("set_BestFitMapping", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
1296                                 set_throw_on = typeof (MethodBuilder).
1297                                         GetMethod ("set_ThrowOnUnmappableChar", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
1298                                 set_exact_spelling = typeof (MethodBuilder).
1299                                         GetMethod ("set_ExactSpelling", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
1300                                 set_set_last_error = typeof (MethodBuilder).
1301                                         GetMethod ("set_SetLastError", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
1302
1303                                 if ((set_best_fit == null) || (set_throw_on == null) ||
1304                                     (set_exact_spelling == null) || (set_set_last_error == null)) {
1305                                         Report.Error (-1, Location,
1306                                                                   "The ThrowOnUnmappableChar, BestFitMapping, SetLastError, " +
1307                                                       "and ExactSpelling attributes can only be emitted when running on the mono runtime.");
1308                                         return null;
1309                                 }
1310                         }
1311
1312                         try {
1313                                 MethodBuilder mb = builder.DefinePInvokeMethod (
1314                                         name, dll_name, entry_point, flags | MethodAttributes.HideBySig | MethodAttributes.PinvokeImpl,
1315                                         method.ParameterInfo.CallingConvention, method.ReturnType, param_types, cc, charset);
1316
1317                                 if (preserve_sig)
1318                                         mb.SetImplementationFlags (MethodImplAttributes.PreserveSig);
1319
1320                                 if (throw_on_unmappable_set)
1321                                         set_throw_on.Invoke (mb, 0, null, new object [] { throw_on_unmappable }, null);
1322                                 if (best_fit_mapping_set)
1323                                         set_best_fit.Invoke (mb, 0, null, new object [] { best_fit_mapping }, null);
1324                                 if (exact_spelling_set)
1325                                         set_exact_spelling.Invoke  (mb, 0, null, new object [] { exact_spelling }, null);
1326                                 if (set_last_error_set)
1327                                         set_set_last_error.Invoke  (mb, 0, null, new object [] { set_last_error }, null);
1328
1329                                 return mb;
1330                         }
1331                         catch (ArgumentException e) {
1332                                 Error_AttributeEmitError (e.Message);
1333                                 return null;
1334                         }
1335                 }
1336
1337                 private Expression GetValue ()
1338                 {
1339                         if (PosArguments == null || PosArguments.Count < 1)
1340                                 return null;
1341
1342                         return ((Argument) PosArguments [0]).Expr;
1343                 }
1344
1345                 public string GetString ()
1346                 {
1347                         Expression e = GetValue ();
1348                         if (e is StringLiteral)
1349                                 return (e as StringLiteral).Value;
1350                         return null;
1351                 }
1352
1353                 public bool GetBoolean ()
1354                 {
1355                         Expression e = GetValue ();
1356                         if (e is BoolLiteral)
1357                                 return (e as BoolLiteral).Value;
1358                         return false;
1359                 }
1360
1361                 public Type GetArgumentType ()
1362                 {
1363                         TypeOf e = GetValue () as TypeOf;
1364                         if (e == null)
1365                                 return null;
1366                         return e.TypeArgument;
1367                 }
1368         }
1369
1370
1371         /// <summary>
1372         /// For global attributes (assembly, module) we need special handling.
1373         /// Attributes can be located in the several files
1374         /// </summary>
1375         public class GlobalAttribute : Attribute
1376         {
1377                 public readonly NamespaceEntry ns;
1378
1379                 public GlobalAttribute (NamespaceEntry ns, string target,
1380                                         Expression left_expr, string identifier, object[] args, Location loc, bool nameEscaped):
1381                         base (target, left_expr, identifier, args, loc, nameEscaped)
1382                 {
1383                         this.ns = ns;
1384                 }
1385
1386                 void Enter ()
1387                 {
1388                         // RootContext.ToplevelTypes has a single NamespaceEntry which gets overwritten
1389                         // each time a new file is parsed.  However, we need to use the NamespaceEntry
1390                         // in effect where the attribute was used.  Since code elsewhere cannot assume
1391                         // that the NamespaceEntry is right, just overwrite it.
1392                         //
1393                         // Precondition: RootContext.ToplevelTypes == null
1394
1395                         if (RootContext.ToplevelTypes.NamespaceEntry != null)
1396                                 throw new InternalErrorException (Location + " non-null NamespaceEntry");
1397
1398                         RootContext.ToplevelTypes.NamespaceEntry = ns;
1399                 }
1400
1401                 void Leave ()
1402                 {
1403                         RootContext.ToplevelTypes.NamespaceEntry = null;
1404                 }
1405
1406                 protected override TypeExpr ResolveAsTypeTerminal (Expression expr, IResolveContext ec, bool silent)
1407                 {
1408                         try {
1409                                 Enter ();
1410                                 return base.ResolveAsTypeTerminal (expr, ec, silent);
1411                         }
1412                         finally {
1413                                 Leave ();
1414                         }
1415                 }
1416
1417                 protected override ConstructorInfo ResolveConstructor (EmitContext ec)
1418                 {
1419                         try {
1420                                 Enter ();
1421                                 return base.ResolveConstructor (ec);
1422                         }
1423                         finally {
1424                                 Leave ();
1425                         }
1426                 }
1427
1428                 protected override bool ResolveNamedArguments (EmitContext ec)
1429                 {
1430                         try {
1431                                 Enter ();
1432                                 return base.ResolveNamedArguments (ec);
1433                         }
1434                         finally {
1435                                 Leave ();
1436                         }
1437                 }
1438         }
1439
1440         public class Attributes {
1441                 public readonly ArrayList Attrs;
1442
1443                 public Attributes (Attribute a)
1444                 {
1445                         Attrs = new ArrayList ();
1446                         Attrs.Add (a);
1447                 }
1448
1449                 public Attributes (ArrayList attrs)
1450                 {
1451                         Attrs = attrs;
1452                 }
1453
1454                 public void AddAttributes (ArrayList attrs)
1455                 {
1456                         Attrs.AddRange (attrs);
1457                 }
1458
1459                 public void AttachTo (Attributable attributable)
1460                 {
1461                         foreach (Attribute a in Attrs)
1462                                 a.AttachTo (attributable);
1463                 }
1464
1465                 /// <summary>
1466                 /// Checks whether attribute target is valid for the current element
1467                 /// </summary>
1468                 public bool CheckTargets ()
1469                 {
1470                         foreach (Attribute a in Attrs) {
1471                                 if (!a.CheckTarget ())
1472                                         return false;
1473                         }
1474                         return true;
1475                 }
1476
1477                 public Attribute Search (Type t)
1478                 {
1479                         foreach (Attribute a in Attrs) {
1480                                 if (a.ResolveType () == t)
1481                                         return a;
1482                         }
1483                         return null;
1484                 }
1485
1486                 /// <summary>
1487                 /// Returns all attributes of type 't'. Use it when attribute is AllowMultiple = true
1488                 /// </summary>
1489                 public Attribute[] SearchMulti (Type t)
1490                 {
1491                         ArrayList ar = null;
1492
1493                         foreach (Attribute a in Attrs) {
1494                                 if (a.ResolveType () == t) {
1495                                         if (ar == null)
1496                                                 ar = new ArrayList ();
1497                                         ar.Add (a);
1498                                 }
1499                         }
1500
1501                         return ar == null ? null : ar.ToArray (typeof (Attribute)) as Attribute[];
1502                 }
1503
1504                 public void Emit ()
1505                 {
1506                         CheckTargets ();
1507
1508                         ListDictionary ld = Attrs.Count > 1 ? new ListDictionary () : null;
1509
1510                         foreach (Attribute a in Attrs)
1511                                 a.Emit (ld);
1512
1513                         if (ld == null || ld.Count == 0)
1514                                 return;
1515
1516                         foreach (DictionaryEntry d in ld) {
1517                                 if (d.Value == null)
1518                                         continue;
1519
1520                                 foreach (Attribute collision in (ArrayList)d.Value)
1521                                         Report.SymbolRelatedToPreviousError (collision.Location, "");
1522
1523                                 Attribute a = (Attribute)d.Key;
1524                                 Report.Error (579, a.Location, "The attribute `{0}' cannot be applied multiple times", a.GetSignatureForError ());
1525                         }
1526                 }
1527
1528                 public bool Contains (Type t)
1529                 {
1530                         return Search (t) != null;
1531                 }
1532         }
1533
1534         /// <summary>
1535         /// Helper class for attribute verification routine.
1536         /// </summary>
1537         sealed class AttributeTester
1538         {
1539                 static PtrHashtable analyzed_types;
1540                 static PtrHashtable analyzed_types_obsolete;
1541                 static PtrHashtable analyzed_member_obsolete;
1542                 static PtrHashtable analyzed_method_excluded;
1543
1544 #if NET_2_0
1545                 static PtrHashtable fixed_buffer_cache;
1546 #endif
1547
1548                 static object TRUE = new object ();
1549                 static object FALSE = new object ();
1550
1551                 static AttributeTester ()
1552                 {
1553                         Reset ();
1554                 }
1555
1556                 private AttributeTester ()
1557                 {
1558                 }
1559
1560                 public static void Reset ()
1561                 {
1562                         analyzed_types = new PtrHashtable ();
1563                         analyzed_types_obsolete = new PtrHashtable ();
1564                         analyzed_member_obsolete = new PtrHashtable ();
1565                         analyzed_method_excluded = new PtrHashtable ();
1566 #if NET_2_0
1567                         fixed_buffer_cache = new PtrHashtable ();
1568 #endif
1569                 }
1570
1571                 public enum Result {
1572                         Ok,
1573                         RefOutArrayError,
1574                         ArrayArrayError
1575                 }
1576
1577                 /// <summary>
1578                 /// Returns true if parameters of two compared methods are CLS-Compliant.
1579                 /// It tests differing only in ref or out, or in array rank.
1580                 /// </summary>
1581                 public static Result AreOverloadedMethodParamsClsCompliant (Type[] types_a, Type[] types_b)
1582                 {
1583                         if (types_a == null || types_b == null)
1584                                 return Result.Ok;
1585
1586                         if (types_a.Length != types_b.Length)
1587                                 return Result.Ok;
1588
1589                         Result result = Result.Ok;
1590                         for (int i = 0; i < types_b.Length; ++i) {
1591                                 Type aType = types_a [i];
1592                                 Type bType = types_b [i];
1593
1594                                 if (aType.IsArray && bType.IsArray) {
1595                                         Type a_el_type = aType.GetElementType ();
1596                                         Type b_el_type = bType.GetElementType ();
1597                                         if (aType.GetArrayRank () != bType.GetArrayRank () && a_el_type == b_el_type) {
1598                                                 result = Result.RefOutArrayError;
1599                                                 continue;
1600                                         }
1601
1602                                         if (a_el_type.IsArray || b_el_type.IsArray) {
1603                                                 result = Result.ArrayArrayError;
1604                                                 continue;
1605                                         }
1606                                 }
1607
1608                                 Type aBaseType = aType;
1609                                 bool is_either_ref_or_out = false;
1610
1611                                 if (aType.IsByRef || aType.IsPointer) {
1612                                         aBaseType = aType.GetElementType ();
1613                                         is_either_ref_or_out = true;
1614                                 }
1615
1616                                 Type bBaseType = bType;
1617                                 if (bType.IsByRef || bType.IsPointer)
1618                                 {
1619                                         bBaseType = bType.GetElementType ();
1620                                         is_either_ref_or_out = !is_either_ref_or_out;
1621                                 }
1622
1623                                 if (aBaseType != bBaseType)
1624                                         return Result.Ok;
1625
1626                                 if (is_either_ref_or_out)
1627                                         result = Result.RefOutArrayError;
1628                         }
1629                         return result;
1630                 }
1631
1632                 /// <summary>
1633                 /// This method tests the CLS compliance of external types. It doesn't test type visibility.
1634                 /// </summary>
1635                 public static bool IsClsCompliant (Type type)
1636                 {
1637                         if (type == null)
1638                                 return true;
1639
1640                         object type_compliance = analyzed_types[type];
1641                         if (type_compliance != null)
1642                                 return type_compliance == TRUE;
1643
1644                         if (type.IsPointer) {
1645                                 analyzed_types.Add (type, null);
1646                                 return false;
1647                         }
1648
1649                         bool result;
1650                         if (type.IsArray || type.IsByRef)       {
1651                                 result = IsClsCompliant (TypeManager.GetElementType (type));
1652                         } else {
1653                                 result = AnalyzeTypeCompliance (type);
1654                         }
1655                         analyzed_types.Add (type, result ? TRUE : FALSE);
1656                         return result;
1657                 }
1658
1659                 /// <summary>
1660                 /// Returns IFixedBuffer implementation if field is fixed buffer else null.
1661                 /// </summary>
1662                 public static IFixedBuffer GetFixedBuffer (FieldInfo fi)
1663                 {
1664                         // Fixed buffer helper type is generated as value type
1665                         if (!fi.FieldType.IsValueType)
1666                                 return null;
1667
1668                         FieldBase fb = TypeManager.GetField (fi);
1669                         if (fb != null) {
1670                                 return fb as IFixedBuffer;
1671                         }
1672
1673 #if NET_2_0
1674                         object o = fixed_buffer_cache [fi];
1675                         if (o == null) {
1676                                 if (System.Attribute.GetCustomAttribute (fi, TypeManager.fixed_buffer_attr_type) == null) {
1677                                         fixed_buffer_cache.Add (fi, FALSE);
1678                                         return null;
1679                                 }
1680
1681                                 IFixedBuffer iff = new FixedFieldExternal (fi);
1682                                 fixed_buffer_cache.Add (fi, iff);
1683                                 return iff;
1684                         }
1685
1686                         if (o == FALSE)
1687                                 return null;
1688
1689                         return (IFixedBuffer)o;
1690 #else
1691                         return null;
1692 #endif
1693                 }
1694
1695                 public static void VerifyModulesClsCompliance ()
1696                 {
1697                         Module[] modules = RootNamespace.Global.Modules;
1698                         if (modules == null)
1699                                 return;
1700
1701                         // The first module is generated assembly
1702                         for (int i = 1; i < modules.Length; ++i) {
1703                                 Module module = modules [i];
1704                                 if (!IsClsCompliant (module)) {
1705                                         Report.Error (3013, "Added modules must be marked with the CLSCompliant attribute " +
1706                                                       "to match the assembly", module.Name);
1707                                         return;
1708                                 }
1709                         }
1710                 }
1711
1712                 public static Type GetImportedIgnoreCaseClsType (string name)
1713                 {
1714                         foreach (Assembly a in RootNamespace.Global.Assemblies) {
1715                                 Type t = a.GetType (name, false, true);
1716                                 if (t == null)
1717                                         continue;
1718
1719                                 if (IsClsCompliant (t))
1720                                         return t;
1721                         }
1722                         return null;
1723                 }
1724
1725                 static bool IsClsCompliant (ICustomAttributeProvider attribute_provider)
1726                 {
1727                         object[] CompliantAttribute = attribute_provider.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1728                         if (CompliantAttribute.Length == 0)
1729                                 return false;
1730
1731                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1732                 }
1733
1734                 static bool AnalyzeTypeCompliance (Type type)
1735                 {
1736                         type = TypeManager.DropGenericTypeArguments (type);
1737                         DeclSpace ds = TypeManager.LookupDeclSpace (type);
1738                         if (ds != null) {
1739                                 return ds.IsClsComplianceRequired ();
1740                         }
1741
1742                         if (TypeManager.IsGenericParameter (type))
1743                                 return true;
1744
1745                         object[] CompliantAttribute = type.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1746                         if (CompliantAttribute.Length == 0)
1747                                 return IsClsCompliant (type.Assembly);
1748
1749                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1750                 }
1751
1752                 // Registers the core type as we assume that they will never be obsolete which
1753                 // makes things easier for bootstrap and faster (we don't need to query Obsolete attribute).
1754                 public static void RegisterNonObsoleteType (Type type)
1755                 {
1756                         analyzed_types_obsolete [type] = FALSE;
1757                 }
1758
1759                 /// <summary>
1760                 /// Returns instance of ObsoleteAttribute when type is obsolete
1761                 /// </summary>
1762                 public static ObsoleteAttribute GetObsoleteAttribute (Type type)
1763                 {
1764                         object type_obsolete = analyzed_types_obsolete [type];
1765                         if (type_obsolete == FALSE)
1766                                 return null;
1767
1768                         if (type_obsolete != null)
1769                                 return (ObsoleteAttribute)type_obsolete;
1770
1771                         ObsoleteAttribute result = null;
1772                         if (TypeManager.HasElementType (type)) {
1773                                 result = GetObsoleteAttribute (TypeManager.GetElementType (type));
1774                         } else if (TypeManager.IsGenericParameter (type) || TypeManager.IsGenericType (type))
1775                                 return null;
1776                         else {
1777                                 DeclSpace type_ds = TypeManager.LookupDeclSpace (type);
1778
1779                                 // Type is external, we can get attribute directly
1780                                 if (type_ds == null) {
1781                                         object[] attribute = type.GetCustomAttributes (TypeManager.obsolete_attribute_type, false);
1782                                         if (attribute.Length == 1)
1783                                                 result = (ObsoleteAttribute)attribute [0];
1784                                 } else {
1785                                         result = type_ds.GetObsoleteAttribute ();
1786                                 }
1787                         }
1788
1789                         // Cannot use .Add because of corlib bootstrap
1790                         analyzed_types_obsolete [type] = result == null ? FALSE : result;
1791                         return result;
1792                 }
1793
1794                 /// <summary>
1795                 /// Returns instance of ObsoleteAttribute when method is obsolete
1796                 /// </summary>
1797                 public static ObsoleteAttribute GetMethodObsoleteAttribute (MethodBase mb)
1798                 {
1799                         IMethodData mc = TypeManager.GetMethod (mb);
1800                         if (mc != null)
1801                                 return mc.GetObsoleteAttribute ();
1802
1803                         // compiler generated methods are not registered by AddMethod
1804                         if (mb.DeclaringType is TypeBuilder)
1805                                 return null;
1806
1807                         MemberInfo mi = TypeManager.GetPropertyFromAccessor (mb);
1808                         if (mi != null)
1809                                 return GetMemberObsoleteAttribute (mi);
1810
1811                         mi = TypeManager.GetEventFromAccessor (mb);
1812                         if (mi != null)
1813                                 return GetMemberObsoleteAttribute (mi);
1814
1815                         return GetMemberObsoleteAttribute (mb);
1816                 }
1817
1818                 /// <summary>
1819                 /// Returns instance of ObsoleteAttribute when member is obsolete
1820                 /// </summary>
1821                 public static ObsoleteAttribute GetMemberObsoleteAttribute (MemberInfo mi)
1822                 {
1823                         object type_obsolete = analyzed_member_obsolete [mi];
1824                         if (type_obsolete == FALSE)
1825                                 return null;
1826
1827                         if (type_obsolete != null)
1828                                 return (ObsoleteAttribute)type_obsolete;
1829
1830                         if ((mi.DeclaringType is TypeBuilder) || TypeManager.IsGenericType (mi.DeclaringType))
1831                                 return null;
1832
1833                         ObsoleteAttribute oa = System.Attribute.GetCustomAttribute (mi, TypeManager.obsolete_attribute_type, false)
1834                                 as ObsoleteAttribute;
1835                         analyzed_member_obsolete.Add (mi, oa == null ? FALSE : oa);
1836                         return oa;
1837                 }
1838
1839                 /// <summary>
1840                 /// Common method for Obsolete error/warning reporting.
1841                 /// </summary>
1842                 public static void Report_ObsoleteMessage (ObsoleteAttribute oa, string member, Location loc)
1843                 {
1844                         if (oa.IsError) {
1845                                 Report.Error (619, loc, "`{0}' is obsolete: `{1}'", member, oa.Message);
1846                                 return;
1847                         }
1848
1849                         if (oa.Message == null) {
1850                                 Report.Warning (612, 1, loc, "`{0}' is obsolete", member);
1851                                 return;
1852                         }
1853                         Report.Warning (618, 2, loc, "`{0}' is obsolete: `{1}'", member, oa.Message);
1854                 }
1855
1856                 public static bool IsConditionalMethodExcluded (MethodBase mb)
1857                 {
1858                         mb = TypeManager.DropGenericMethodArguments (mb);
1859                         if ((mb is MethodBuilder) || (mb is ConstructorBuilder))
1860                                 return false;
1861
1862                         object excluded = analyzed_method_excluded [mb];
1863                         if (excluded != null)
1864                                 return excluded == TRUE ? true : false;
1865
1866                         ConditionalAttribute[] attrs = mb.GetCustomAttributes (TypeManager.conditional_attribute_type, true)
1867                                 as ConditionalAttribute[];
1868                         if (attrs.Length == 0) {
1869                                 analyzed_method_excluded.Add (mb, FALSE);
1870                                 return false;
1871                         }
1872
1873                         foreach (ConditionalAttribute a in attrs) {
1874                                 if (RootContext.AllDefines.Contains (a.ConditionString)) {
1875                                         analyzed_method_excluded.Add (mb, FALSE);
1876                                         return false;
1877                                 }
1878                         }
1879                         analyzed_method_excluded.Add (mb, TRUE);
1880                         return true;
1881                 }
1882
1883                 /// <summary>
1884                 /// Analyzes class whether it has attribute which has ConditionalAttribute
1885                 /// and its condition is not defined.
1886                 /// </summary>
1887                 public static bool IsAttributeExcluded (Type type)
1888                 {
1889                         if (!type.IsClass)
1890                                 return false;
1891
1892                         Class class_decl = TypeManager.LookupDeclSpace (type) as Class;
1893
1894                         // TODO: add caching
1895                         // TODO: merge all Type bases attribute caching to one cache to save memory
1896                         if (class_decl == null) {
1897                                 object[] attributes = type.GetCustomAttributes (TypeManager.conditional_attribute_type, false);
1898                                 foreach (ConditionalAttribute ca in attributes) {
1899                                         if (RootContext.AllDefines.Contains (ca.ConditionString))
1900                                                 return false;
1901                                 }
1902                                 return attributes.Length > 0;
1903                         }
1904
1905                         return class_decl.IsExcluded ();
1906                 }
1907
1908                 public static Type GetCoClassAttribute (Type type)
1909                 {
1910                         TypeContainer tc = TypeManager.LookupInterface (type);
1911                         if (tc == null) {
1912                                 object[] o = type.GetCustomAttributes (TypeManager.coclass_attr_type, false);
1913                                 if (o.Length < 1)
1914                                         return null;
1915                                 return ((System.Runtime.InteropServices.CoClassAttribute)o[0]).CoClass;
1916                         }
1917
1918                         if (tc.OptAttributes == null)
1919                                 return null;
1920
1921                         Attribute a = tc.OptAttributes.Search (TypeManager.coclass_attr_type);
1922                         if (a == null)
1923                                 return null;
1924
1925                         return a.GetCoClassAttributeValue ();
1926                 }
1927         }
1928 }