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