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