mcs/mcs/attribute.cs

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