mcs/mcs/parameter.cs

   1 //
   2 // parameter.cs: Parameter definition.
   3 //
   4 // Author: Miguel de Icaza (miguel@gnu.org)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // Dual licensed under the terms of the MIT X11 or GNU GPL
   8 //
   9 // Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
  10 // Copyright 2003-2008 Novell, Inc.
  11 //
  12 //
  13 using System;
  14 using System.Reflection;
  15 using System.Reflection.Emit;
  16 using System.Collections;
  17 using System.Text;
  18
  19 namespace Mono.CSharp {
  20
  21         /// <summary>
  22         ///   Abstract Base class for parameters of a method.
  23         /// </summary>
  24         public abstract class ParameterBase : Attributable {
  25
  26                 protected ParameterBuilder builder;
  27
  28                 protected ParameterBase (Attributes attrs)
  29                         : base (attrs)
  30                 {
  31                 }
  32
  33                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
  34                 {
  35 #if !NET_2_0
  36                         if (a.Type == pa.MarshalAs) {
  37                                 UnmanagedMarshal marshal = a.GetMarshal (this);
  38                                 if (marshal != null) {
  39                                         builder.SetMarshal (marshal);
  40                                 }
  41                                 return;
  42                         }
  43 #endif
  44                         if (a.HasSecurityAttribute) {
  45                                 a.Error_InvalidSecurityParent ();
  46                                 return;
  47                         }
  48
  49                         builder.SetCustomAttribute (cb);
  50                 }
  51
  52                 public override bool IsClsComplianceRequired()
  53                 {
  54                         return false;
  55                 }
  56         }
  57
  58         /// <summary>
  59         /// Class for applying custom attributes on the return type
  60         /// </summary>
  61         public class ReturnParameter : ParameterBase {
  62                 public ReturnParameter (MethodBuilder mb, Location location):
  63                         base (null)
  64                 {
  65                         try {
  66                                 builder = mb.DefineParameter (0, ParameterAttributes.None, "");
  67                         }
  68                         catch (ArgumentOutOfRangeException) {
  69                                 Report.RuntimeMissingSupport (location, "custom attributes on the return type");
  70                         }
  71                 }
  72
  73                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
  74                 {
  75                         if (a.Type == pa.CLSCompliant) {
  76                                 Report.Warning (3023, 1, a.Location, "CLSCompliant attribute has no meaning when applied to return types. Try putting it on the method instead");
  77                         }
  78
  79                         // This occurs after Warning -28
  80                         if (builder == null)
  81                                 return;
  82
  83                         base.ApplyAttributeBuilder (a, cb, pa);
  84                 }
  85
  86                 public override AttributeTargets AttributeTargets {
  87                         get {
  88                                 return AttributeTargets.ReturnValue;
  89                         }
  90                 }
  91
  92                 public override IResolveContext ResolveContext {
  93                         get {
  94                                 throw new NotSupportedException ();
  95                         }
  96                 }
  97
  98                 /// <summary>
  99                 /// Is never called
 100                 /// </summary>
 101                 public override string[] ValidAttributeTargets {
 102                         get {
 103                                 return null;
 104                         }
 105                 }
 106         }
 107
 108         /// <summary>
 109         /// Class for applying custom attributes on the implicit parameter type
 110         /// of the 'set' method in properties, and the 'add' and 'remove' methods in events.
 111         /// </summary>
 112         ///
 113         // TODO: should use more code from Parameter.ApplyAttributeBuilder
 114         public class ImplicitParameter : ParameterBase {
 115                 public ImplicitParameter (MethodBuilder mb):
 116                         base (null)
 117                 {
 118                         builder = mb.DefineParameter (1, ParameterAttributes.None, "value");
 119                 }
 120
 121                 public override AttributeTargets AttributeTargets {
 122                         get {
 123                                 return AttributeTargets.Parameter;
 124                         }
 125                 }
 126
 127                 public override IResolveContext ResolveContext {
 128                         get {
 129                                 throw new NotSupportedException ();
 130                         }
 131                 }
 132
 133                 /// <summary>
 134                 /// Is never called
 135                 /// </summary>
 136                 public override string[] ValidAttributeTargets {
 137                         get {
 138                                 return null;
 139                         }
 140                 }
 141         }
 142
 143         public class ImplicitLambdaParameter : Parameter
 144         {
 145                 public ImplicitLambdaParameter (string name, Location loc)
 146                         : base (null, name, Modifier.NONE, null, loc)
 147                 {
 148                 }
 149
 150                 public override Type Resolve (IResolveContext ec)
 151                 {
 152                         if (parameter_type == null)
 153                                 throw new InternalErrorException ("A type of implicit lambda parameter `{0}' is not set",
 154                                         Name);
 155
 156                         return parameter_type;
 157                 }
 158
 159                 public Type Type {
 160                         set { parameter_type = value; }
 161                 }
 162         }
 163
 164         public class ParamsParameter : Parameter {
 165                 public ParamsParameter (FullNamedExpression type, string name, Attributes attrs, Location loc):
 166                         base (type, name, Parameter.Modifier.PARAMS, attrs, loc)
 167                 {
 168                 }
 169
 170                 public override Type Resolve (IResolveContext ec)
 171                 {
 172                         if (base.Resolve (ec) == null)
 173                                 return null;
 174
 175                         if (!parameter_type.IsArray || parameter_type.GetArrayRank () != 1) {
 176                                 Report.Error (225, Location, "The params parameter must be a single dimensional array");
 177                                 return null;
 178                         }
 179
 180                         return parameter_type;
 181                 }
 182
 183                 public override void ApplyAttributes (MethodBuilder mb, ConstructorBuilder cb, int index)
 184                 {
 185                         base.ApplyAttributes (mb, cb, index);
 186                         PredefinedAttributes.Get.ParamArray.EmitAttribute (builder, Location);
 187                 }
 188         }
 189
 190         public class ArglistParameter : Parameter {
 191                 // Doesn't have proper type because it's never chosen for better conversion
 192                 public ArglistParameter (Location loc) :
 193                         base (null, String.Empty, Parameter.Modifier.ARGLIST, null, loc)
 194                 {
 195                 }
 196
 197                 public override void  ApplyAttributes (MethodBuilder mb, ConstructorBuilder cb, int index)
 198                 {
 199                         // Nothing to do
 200                 }
 201
 202                 public override bool CheckAccessibility (InterfaceMemberBase member)
 203                 {
 204                         return true;
 205                 }
 206
 207                 public override Type Resolve (IResolveContext ec)
 208                 {
 209                         return typeof (ArglistParameter);
 210                 }
 211
 212                 public override string GetSignatureForError ()
 213                 {
 214                         return "__arglist";
 215                 }
 216         }
 217
 218         public interface IParameterData
 219         {
 220                 bool HasExtensionMethodModifier { get; }
 221                 Parameter.Modifier ModFlags { get; }
 222                 string Name { get; }
 223         }
 224
 225         //
 226         // Parameter information created by parser
 227         //
 228         public class Parameter : ParameterBase, IParameterData, ILocalVariable {
 229                 [Flags]
 230                 public enum Modifier : byte {
 231                         NONE    = 0,
 232                         REF     = REFMASK | ISBYREF,
 233                         OUT     = OUTMASK | ISBYREF,
 234                         PARAMS  = 4,
 235                         // This is a flag which says that it's either REF or OUT.
 236                         ISBYREF = 8,
 237                         ARGLIST = 16,
 238                         REFMASK = 32,
 239                         OUTMASK = 64,
 240                         This    = 128
 241                 }
 242
 243                 static string[] attribute_targets = new string [] { "param" };
 244
 245                 protected FullNamedExpression TypeName;
 246                 readonly Modifier modFlags;
 247                 string name;
 248                 protected Type parameter_type;
 249                 public readonly Location Location;
 250                 int idx;
 251                 public bool HasAddressTaken;
 252
 253                 IResolveContext resolve_context;
 254                 LocalVariableReference expr_tree_variable;
 255                 static TypeExpr parameter_expr_tree_type;
 256
 257                 public HoistedVariable HoistedVariableReference;
 258
 259                 public Parameter (FullNamedExpression type, string name, Modifier mod, Attributes attrs, Location loc)
 260                         : base (attrs)
 261                 {
 262                         if (type == TypeManager.system_void_expr)
 263                                 Report.Error (1536, loc, "Invalid parameter type `void'");
 264
 265                         this.name = name;
 266                         modFlags = mod;
 267                         Location = loc;
 268                         TypeName = type;
 269                 }
 270
 271                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
 272                 {
 273                         if (a.Type == pa.In && ModFlags == Modifier.OUT) {
 274                                 Report.Error (36, a.Location, "An out parameter cannot have the `In' attribute");
 275                                 return;
 276                         }
 277
 278                         if (a.Type == pa.ParamArray) {
 279                                 Report.Error (674, a.Location, "Do not use `System.ParamArrayAttribute'. Use the `params' keyword instead");
 280                                 return;
 281                         }
 282
 283                         if (a.Type == PredefinedAttributes.Get.Out && (ModFlags & Modifier.REF) == Modifier.REF &&
 284                             !OptAttributes.Contains (pa.In)) {
 285                                 Report.Error (662, a.Location,
 286                                         "Cannot specify only `Out' attribute on a ref parameter. Use both `In' and `Out' attributes or neither");
 287                                 return;
 288                         }
 289
 290                         if (a.Type == pa.CLSCompliant) {
 291                                 Report.Warning (3022, 1, a.Location, "CLSCompliant attribute has no meaning when applied to parameters. Try putting it on the method instead");
 292                         }
 293
 294                         // TypeManager.default_parameter_value_attribute_type is null if !NET_2_0, or if System.dll is not referenced
 295                         if (a.Type == pa.DefaultParameterValue) {
 296                                 object val = a.GetParameterDefaultValue ();
 297                                 if (val != null) {
 298                                         Type t = val.GetType ();
 299                                         if (t.IsArray || TypeManager.IsSubclassOf (t, TypeManager.type_type)) {
 300                                                 if (parameter_type == TypeManager.object_type) {
 301                                                         if (!t.IsArray)
 302                                                                 t = TypeManager.type_type;
 303
 304                                                         Report.Error (1910, a.Location, "Argument of type `{0}' is not applicable for the DefaultValue attribute",
 305                                                                 TypeManager.CSharpName (t));
 306                                                 } else {
 307                                                         Report.Error (1909, a.Location, "The DefaultValue attribute is not applicable on parameters of type `{0}'",
 308                                                                 TypeManager.CSharpName (parameter_type)); ;
 309                                                 }
 310                                                 return;
 311                                         }
 312                                 }
 313
 314                                 if (parameter_type == TypeManager.object_type ||
 315                                     (val == null && !TypeManager.IsGenericParameter (parameter_type) && TypeManager.IsReferenceType (parameter_type)) ||
 316                                     (val != null && TypeManager.TypeToCoreType (val.GetType ()) == parameter_type))
 317                                         builder.SetConstant (val);
 318                                 else
 319                                         Report.Error (1908, a.Location, "The type of the default value should match the type of the parameter");
 320                                 return;
 321                         }
 322
 323                         base.ApplyAttributeBuilder (a, cb, pa);
 324                 }
 325
 326                 public virtual bool CheckAccessibility (InterfaceMemberBase member)
 327                 {
 328                         if (parameter_type == null || TypeManager.IsGenericParameter (parameter_type))
 329                                 return true;
 330
 331                         return member.IsAccessibleAs (parameter_type);
 332                 }
 333
 334                 public override IResolveContext ResolveContext {
 335                         get {
 336                                 return resolve_context;
 337                         }
 338                 }
 339
 340                 // <summary>
 341                 //   Resolve is used in method definitions
 342                 // </summary>
 343                 public virtual Type Resolve (IResolveContext ec)
 344                 {
 345                         // HACK: to resolve attributes correctly
 346                         this.resolve_context = ec;
 347
 348                         if (parameter_type != null)
 349                                 return parameter_type;
 350
 351                         TypeExpr texpr = TypeName.ResolveAsTypeTerminal (ec, false);
 352                         if (texpr == null)
 353                                 return null;
 354
 355                         parameter_type = texpr.Type;
 356
 357                         if ((modFlags & Parameter.Modifier.ISBYREF) != 0 &&
 358                                 TypeManager.IsSpecialType (parameter_type)) {
 359                                 Report.Error (1601, Location, "Method or delegate parameter cannot be of type `{0}'",
 360                                         GetSignatureForError ());
 361                                 return null;
 362                         }
 363
 364                         TypeParameter tp = TypeManager.LookupTypeParameter (parameter_type);
 365                         if (tp != null) {
 366                                 if ((modFlags & Parameter.Modifier.ISBYREF) != 0) {
 367                                         if (tp.Variance != Variance.None)
 368                                                 tp.ErrorInvalidVariance ((MemberCore) ec, Variance.None);
 369                                 } else if (tp.Variance == Variance.Covariant) {
 370                                         tp.ErrorInvalidVariance ((MemberCore) ec, Variance.Contravariant);
 371                                 }
 372                         } else {
 373                                 if ((parameter_type.Attributes & Class.StaticClassAttribute) == Class.StaticClassAttribute) {
 374                                         Report.Error (721, Location, "`{0}': static types cannot be used as parameters",
 375                                                 texpr.GetSignatureForError ());
 376                                         return parameter_type;
 377                                 }
 378
 379                                 if ((modFlags & Modifier.This) != 0 && parameter_type.IsPointer) {
 380                                         Report.Error (1103, Location, "The type of extension method cannot be `{0}'",
 381                                                 TypeManager.CSharpName (parameter_type));
 382                                 }
 383                         }
 384
 385                         return parameter_type;
 386                 }
 387
 388                 public void ResolveVariable (int idx)
 389                 {
 390                         this.idx = idx;
 391                 }
 392
 393                 public bool HasExtensionMethodModifier {
 394                         get { return (modFlags & Modifier.This) != 0; }
 395                 }
 396
 397                 public Modifier ModFlags {
 398                         get { return modFlags & ~Modifier.This; }
 399                 }
 400
 401                 public string Name {
 402                         get { return name; }
 403                         set { name = value; }
 404                 }
 405
 406                 ParameterAttributes Attributes {
 407                         get { return ParametersCompiled.GetParameterAttribute (modFlags); }
 408                 }
 409
 410                 public override AttributeTargets AttributeTargets {
 411                         get {
 412                                 return AttributeTargets.Parameter;
 413                         }
 414                 }
 415
 416                 public virtual string GetSignatureForError ()
 417                 {
 418                         string type_name;
 419                         if (parameter_type != null)
 420                                 type_name = TypeManager.CSharpName (parameter_type);
 421                         else
 422                                 type_name = TypeName.GetSignatureForError ();
 423
 424                         string mod = GetModifierSignature (modFlags);
 425                         if (mod.Length > 0)
 426                                 return String.Concat (mod, " ", type_name);
 427
 428                         return type_name;
 429                 }
 430
 431                 public static string GetModifierSignature (Modifier mod)
 432                 {
 433                         switch (mod) {
 434                         case Modifier.OUT:
 435                                 return "out";
 436                         case Modifier.PARAMS:
 437                                 return "params";
 438                         case Modifier.REF:
 439                                 return "ref";
 440                         case Modifier.This:
 441                                 return "this";
 442                         default:
 443                                 return "";
 444                         }
 445                 }
 446
 447                 public void IsClsCompliant ()
 448                 {
 449                         if (AttributeTester.IsClsCompliant (parameter_type))
 450                                 return;
 451
 452                         Report.Warning (3001, 1, Location, "Argument type `{0}' is not CLS-compliant", GetSignatureForError ());
 453                 }
 454
 455                 public virtual void ApplyAttributes (MethodBuilder mb, ConstructorBuilder cb, int index)
 456                 {
 457                         if (mb == null)
 458                                 builder = cb.DefineParameter (index, Attributes, Name);
 459                         else
 460                                 builder = mb.DefineParameter (index, Attributes, Name);
 461
 462                         if (OptAttributes != null)
 463                                 OptAttributes.Emit ();
 464                 }
 465
 466                 public override string[] ValidAttributeTargets {
 467                         get {
 468                                 return attribute_targets;
 469                         }
 470                 }
 471
 472                 public Parameter Clone ()
 473                 {
 474                         Parameter p = (Parameter) MemberwiseClone ();
 475                         if (attributes != null) {
 476                                 p.attributes = attributes.Clone ();
 477                                 p.attributes.AttachTo (p);
 478                         }
 479
 480                         return p;
 481                 }
 482
 483                 public ExpressionStatement CreateExpressionTreeVariable (EmitContext ec)
 484                 {
 485                         //
 486                         // A parameter is not hoisted when used directly as ET
 487                         //
 488                         HoistedVariableReference = null;
 489
 490                         if ((modFlags & Modifier.ISBYREF) != 0)
 491                                 Report.Error (1951, Location, "An expression tree parameter cannot use `ref' or `out' modifier");
 492
 493                         LocalInfo variable = ec.CurrentBlock.AddTemporaryVariable (
 494                                 ResolveParameterExpressionType (ec, Location), Location);
 495                         variable.Resolve (ec);
 496
 497                         expr_tree_variable = new LocalVariableReference (
 498                                 ec.CurrentBlock, variable.Name, Location, variable, false);
 499
 500                         ArrayList arguments = new ArrayList (2);
 501                         arguments.Add (new Argument (new TypeOf (
 502                                 new TypeExpression (parameter_type, Location), Location)));
 503                         arguments.Add (new Argument (new StringConstant (Name, Location)));
 504                         return new SimpleAssign (ExpressionTreeVariableReference (),
 505                                 Expression.CreateExpressionFactoryCall ("Parameter", null, arguments, Location));
 506                 }
 507
 508                 public void Emit (EmitContext ec)
 509                 {
 510                         int arg_idx = idx;
 511                         if (!ec.IsStatic)
 512                                 arg_idx++;
 513
 514                         ParameterReference.EmitLdArg (ec.ig, arg_idx);
 515                 }
 516
 517                 public void EmitAssign (EmitContext ec)
 518                 {
 519                         int arg_idx = idx;
 520                         if (!ec.IsStatic)
 521                                 arg_idx++;
 522
 523                         if (arg_idx <= 255)
 524                                 ec.ig.Emit (OpCodes.Starg_S, (byte) arg_idx);
 525                         else
 526                                 ec.ig.Emit (OpCodes.Starg, arg_idx);
 527                 }
 528
 529                 public void EmitAddressOf (EmitContext ec)
 530                 {
 531                         int arg_idx = idx;
 532
 533                         if (!ec.IsStatic)
 534                                 arg_idx++;
 535
 536                         bool is_ref = (ModFlags & Modifier.ISBYREF) != 0;
 537                         if (is_ref) {
 538                                 ParameterReference.EmitLdArg (ec.ig, arg_idx);
 539                         } else {
 540                                 if (arg_idx <= 255)
 541                                         ec.ig.Emit (OpCodes.Ldarga_S, (byte) arg_idx);
 542                                 else
 543                                         ec.ig.Emit (OpCodes.Ldarga, arg_idx);
 544                         }
 545                 }
 546
 547                 public Expression ExpressionTreeVariableReference ()
 548                 {
 549                         return expr_tree_variable;
 550                 }
 551
 552                 //
 553                 // System.Linq.Expressions.ParameterExpression type
 554                 //
 555                 public static TypeExpr ResolveParameterExpressionType (EmitContext ec, Location location)
 556                 {
 557                         if (parameter_expr_tree_type != null)
 558                                 return parameter_expr_tree_type;
 559
 560                         Type p_type = TypeManager.parameter_expression_type;
 561                         if (p_type == null) {
 562                                 p_type = TypeManager.CoreLookupType ("System.Linq.Expressions", "ParameterExpression", Kind.Class, true);
 563                                 TypeManager.parameter_expression_type = p_type;
 564                         }
 565
 566                         parameter_expr_tree_type = new TypeExpression (p_type, location).
 567                                 ResolveAsTypeTerminal (ec, false);
 568
 569                         return parameter_expr_tree_type;
 570                 }
 571         }
 572
 573         //
 574         // Imported or resolved parameter information
 575         //
 576         public class ParameterData : IParameterData
 577         {
 578                 readonly string name;
 579                 readonly Parameter.Modifier modifiers;
 580
 581                 public ParameterData (string name, Parameter.Modifier modifiers)
 582                 {
 583                         this.name = name;
 584                         this.modifiers = modifiers;
 585                 }
 586
 587                 #region IParameterData Members
 588
 589                 public bool HasExtensionMethodModifier {
 590                         get { return (modifiers & Parameter.Modifier.This) != 0; }
 591                 }
 592
 593                 public Parameter.Modifier ModFlags {
 594                         get { return modifiers & ~Parameter.Modifier.This; }
 595                 }
 596
 597                 public string Name {
 598                         get { return name; }
 599                 }
 600
 601                 #endregion
 602         }
 603
 604         public abstract class AParametersCollection
 605         {
 606                 protected bool has_arglist;
 607                 protected bool has_params;
 608
 609                 // Null object pattern
 610                 protected IParameterData [] parameters;
 611                 protected Type [] types;
 612
 613                 public int Count {
 614                         get { return parameters.Length; }
 615                 }
 616
 617                 public Type ExtensionMethodType {
 618                         get {
 619                                 if (Count == 0)
 620                                         return null;
 621
 622                                 return FixedParameters [0].HasExtensionMethodModifier ?
 623                                         types [0] : null;
 624                         }
 625                 }
 626
 627                 public IParameterData [] FixedParameters {
 628                         get {
 629                                 return parameters;
 630                         }
 631                 }
 632
 633                 public static ParameterAttributes GetParameterAttribute (Parameter.Modifier modFlags)
 634                 {
 635                         return (modFlags & Parameter.Modifier.OUT) == Parameter.Modifier.OUT ?
 636                                 ParameterAttributes.Out : ParameterAttributes.None;
 637                 }
 638
 639                 public Type [] GetEmitTypes ()
 640                 {
 641                         Type [] types = null;
 642                         if (has_arglist) {
 643                                 if (Count == 1)
 644                                         return Type.EmptyTypes;
 645
 646                                 types = new Type [Count - 1];
 647                                 Array.Copy (Types, types, types.Length);
 648                         }
 649
 650                         for (int i = 0; i < Count; ++i) {
 651                                 if ((FixedParameters [i].ModFlags & Parameter.Modifier.ISBYREF) == 0)
 652                                         continue;
 653
 654                                 if (types == null)
 655                                         types = (Type []) Types.Clone ();
 656
 657                                 types [i] = TypeManager.GetReferenceType (types [i]);
 658                         }
 659
 660                         if (types == null)
 661                                 types = Types;
 662
 663                         return types;
 664                 }
 665
 666                 public string GetSignatureForError ()
 667                 {
 668                         StringBuilder sb = new StringBuilder ("(");
 669                         for (int i = 0; i < Count; ++i) {
 670                                 if (i != 0)
 671                                         sb.Append (", ");
 672                                 sb.Append (ParameterDesc (i));
 673                         }
 674                         sb.Append (')');
 675                         return sb.ToString ();
 676                 }
 677
 678                 public bool HasArglist {
 679                         get { return has_arglist; }
 680                 }
 681
 682                 public bool HasExtensionMethodType {
 683                         get {
 684                                 if (Count == 0)
 685                                         return false;
 686
 687                                 return FixedParameters [0].HasExtensionMethodModifier;
 688                         }
 689                 }
 690
 691                 public bool HasParams {
 692                         get { return has_params; }
 693                 }
 694
 695                 public bool IsEmpty {
 696                         get { return parameters.Length == 0; }
 697                 }
 698
 699                 public string ParameterDesc (int pos)
 700                 {
 701                         if (types == null || types [pos] == null)
 702                                 return ((Parameter)FixedParameters [pos]).GetSignatureForError ();
 703
 704                         string type = TypeManager.CSharpName (types [pos]);
 705                         if (FixedParameters [pos].HasExtensionMethodModifier)
 706                                 return "this " + type;
 707
 708                         Parameter.Modifier mod = FixedParameters [pos].ModFlags & ~Parameter.Modifier.ARGLIST;
 709                         if (mod == 0)
 710                                 return type;
 711
 712                         return Parameter.GetModifierSignature (mod) + " " + type;
 713                 }
 714
 715                 public Type[] Types {
 716                         get { return types; }
 717                         set { types = value; }
 718                 }
 719
 720 #if MS_COMPATIBLE
 721                 public AParametersCollection InflateTypes (Type[] genArguments, Type[] argTypes)
 722                 {
 723                         AParametersCollection p = (AParametersCollection) MemberwiseClone (); // Clone ();
 724
 725                         for (int i = 0; i < Count; ++i) {
 726                                 if (types[i].IsGenericType) {
 727                                         Type[] gen_arguments_open = new Type[types[i].GetGenericTypeDefinition ().GetGenericArguments ().Length];
 728                                         Type[] gen_arguments = types[i].GetGenericArguments ();
 729                                         for (int ii = 0; ii < gen_arguments_open.Length; ++ii) {
 730                                                 if (gen_arguments[ii].IsGenericParameter) {
 731                                                         Type t = argTypes[gen_arguments[ii].GenericParameterPosition];
 732                                                         gen_arguments_open[ii] = t;
 733                                                 } else
 734                                                         gen_arguments_open[ii] = gen_arguments[ii];
 735                                         }
 736
 737                                         p.types[i] = types[i].GetGenericTypeDefinition ().MakeGenericType (gen_arguments_open);
 738                                         continue;
 739                                 }
 740
 741                                 if (types[i].IsGenericParameter) {
 742                                         Type gen_argument = argTypes[types[i].GenericParameterPosition];
 743                                         p.types[i] = gen_argument;
 744                                         continue;
 745                                 }
 746                         }
 747
 748                         return p;
 749                 }
 750 #endif
 751         }
 752
 753         //
 754         // A collection of imported or resolved parameters
 755         //
 756         public class ParametersImported : AParametersCollection
 757         {
 758                 ParametersImported (AParametersCollection param, Type[] types)
 759                 {
 760                         this.parameters = param.FixedParameters;
 761                         this.types = types;
 762                         has_arglist = param.HasArglist;
 763                         has_params = param.HasParams;
 764                 }
 765
 766                 ParametersImported (IParameterData [] parameters, Type [] types, MethodBase method, bool hasParams)
 767                 {
 768                         this.parameters = parameters;
 769                         this.types = types;
 770                         has_arglist = (method.CallingConvention & CallingConventions.VarArgs) != 0;
 771                         if (has_arglist) {
 772                                 this.parameters = new IParameterData [parameters.Length + 1];
 773                                 parameters.CopyTo (this.parameters, 0);
 774                                 this.parameters [parameters.Length] = new ArglistParameter (Location.Null);
 775                                 this.types = new Type [types.Length + 1];
 776                                 types.CopyTo (this.types, 0);
 777                                 this.types [types.Length] = TypeManager.arg_iterator_type;
 778                         }
 779                         has_params = hasParams;
 780                 }
 781
 782                 public ParametersImported (IParameterData [] param, Type[] types)
 783                 {
 784                         this.parameters = param;
 785                         this.types = types;
 786                 }
 787
 788                 public static AParametersCollection Create (MethodBase method)
 789                 {
 790                         return Create (method.GetParameters (), method);
 791                 }
 792
 793                 //
 794                 // Generic method parameters importer, param is shared between all instances
 795                 //
 796                 public static AParametersCollection Create (AParametersCollection param, MethodBase method)
 797                 {
 798                         if (param.IsEmpty)
 799                                 return param;
 800
 801                         ParameterInfo [] pi = method.GetParameters ();
 802                         Type [] types = new Type [pi.Length];
 803                         for (int i = 0; i < types.Length; i++) {
 804                                 Type t = pi [i].ParameterType;
 805                                 if (t.IsByRef)
 806                                         t = TypeManager.GetElementType (t);
 807
 808                                 types [i] = TypeManager.TypeToCoreType (t);
 809                         }
 810
 811                         return new ParametersImported (param, types);
 812                 }
 813
 814                 //
 815                 // Imports SRE parameters
 816                 //
 817                 public static AParametersCollection Create (ParameterInfo [] pi, MethodBase method)
 818                 {
 819                         if (pi.Length == 0) {
 820                                 if (method != null && (method.CallingConvention & CallingConventions.VarArgs) != 0)
 821                                         return new ParametersImported (new IParameterData [0], Type.EmptyTypes, method, false);
 822
 823                                 return ParametersCompiled.EmptyReadOnlyParameters;
 824                         }
 825
 826                         Type [] types = new Type [pi.Length];
 827                         IParameterData [] par = new IParameterData [pi.Length];
 828                         bool is_params = false;
 829                         PredefinedAttribute extension_attr = PredefinedAttributes.Get.Extension;
 830                         PredefinedAttribute param_attr = PredefinedAttributes.Get.ParamArray;
 831                         for (int i = 0; i < types.Length; i++) {
 832                                 types [i] = TypeManager.TypeToCoreType (pi [i].ParameterType);
 833
 834                                 ParameterInfo p = pi [i];
 835                                 Parameter.Modifier mod = 0;
 836                                 if (types [i].IsByRef) {
 837                                         if ((p.Attributes & (ParameterAttributes.Out | ParameterAttributes.In)) == ParameterAttributes.Out)
 838                                                 mod = Parameter.Modifier.OUT;
 839                                         else
 840                                                 mod = Parameter.Modifier.REF;
 841
 842                                         //
 843                                         // Strip reference wrapping
 844                                         //
 845                                         types [i] = TypeManager.GetElementType (types [i]);
 846                                 } else if (i == 0 && extension_attr.IsDefined && method != null && method.IsStatic &&
 847                                 (method.DeclaringType.Attributes & Class.StaticClassAttribute) == Class.StaticClassAttribute &&
 848                                         method.IsDefined (extension_attr.Type, false)) {
 849                                         mod = Parameter.Modifier.This;
 850                                 } else if (i >= pi.Length - 2 && types [i].IsArray) {
 851                                         if (p.IsDefined (param_attr.Type, false)) {
 852                                                 mod = Parameter.Modifier.PARAMS;
 853                                                 is_params = true;
 854                                         }
 855                                 }
 856
 857                                 par [i] = new ParameterData (p.Name, mod);
 858                         }
 859
 860                         return method != null ?
 861                                 new ParametersImported (par, types, method, is_params) :
 862                                 new ParametersImported (par, types);
 863                 }
 864         }
 865
 866         /// <summary>
 867         ///   Represents the methods parameters
 868         /// </summary>
 869         public class ParametersCompiled : AParametersCollection
 870         {
 871                 public static readonly ParametersCompiled EmptyReadOnlyParameters = new ParametersCompiled ();
 872
 873                 // Used by C# 2.0 delegates
 874                 public static readonly ParametersCompiled Undefined = new ParametersCompiled ();
 875
 876                 private ParametersCompiled ()
 877                 {
 878                         parameters = new Parameter [0];
 879                         types = Type.EmptyTypes;
 880                 }
 881
 882                 private ParametersCompiled (Parameter [] parameters, Type [] types)
 883                 {
 884                         this.parameters = parameters;
 885                     this.types = types;
 886                 }
 887
 888                 public ParametersCompiled (params Parameter[] parameters)
 889                 {
 890                         if (parameters == null)
 891                                 throw new ArgumentException ("Use EmptyReadOnlyParameters");
 892
 893                         this.parameters = parameters;
 894                         int count = parameters.Length;
 895
 896                         if (count == 0)
 897                                 return;
 898
 899                         if (count == 1) {
 900                                 has_params = (parameters [0].ModFlags & Parameter.Modifier.PARAMS) != 0;
 901                                 return;
 902                         }
 903
 904                         for (int i = 0; i < count; i++){
 905                                 string base_name = parameters [i].Name;
 906                                 has_params |= (parameters [i].ModFlags & Parameter.Modifier.PARAMS) != 0;
 907
 908                                 for (int j = i + 1; j < count; j++){
 909                                         if (base_name != parameters [j].Name)
 910                                                 continue;
 911
 912                                         ErrorDuplicateName (parameters [i]);
 913                                         i = j;
 914                                 }
 915                         }
 916                 }
 917
 918                 public ParametersCompiled (Parameter [] parameters, bool has_arglist) :
 919                         this (parameters)
 920                 {
 921                         this.has_arglist = has_arglist;
 922                 }
 923
 924                 public static ParametersCompiled CreateFullyResolved (Parameter p, Type type)
 925                 {
 926                         return new ParametersCompiled (new Parameter [] { p }, new Type [] { type });
 927                 }
 928
 929                 public static ParametersCompiled CreateFullyResolved (Parameter[] parameters, Type[] types)
 930                 {
 931                         return new ParametersCompiled (parameters, types);
 932                 }
 933
 934                 public static ParametersCompiled MergeGenerated (ParametersCompiled userParams, bool checkConflicts, Parameter compilerParams, Type compilerTypes)
 935                 {
 936                         return MergeGenerated (userParams, checkConflicts,
 937                                 new Parameter [] { compilerParams },
 938                                 new Type [] { compilerTypes });
 939                 }
 940
 941                 //
 942                 // Use this method when you merge compiler generated parameters with user parameters
 943                 //
 944                 public static ParametersCompiled MergeGenerated (ParametersCompiled userParams, bool checkConflicts, Parameter[] compilerParams, Type[] compilerTypes)
 945                 {
 946                         Parameter[] all_params = new Parameter [userParams.Count + compilerParams.Length];
 947                         userParams.FixedParameters.CopyTo(all_params, 0);
 948
 949                         Type [] all_types;
 950                         if (userParams.types != null) {
 951                                 all_types = new Type [all_params.Length];
 952                                 userParams.Types.CopyTo (all_types, 0);
 953                         } else {
 954                                 all_types = null;
 955                         }
 956
 957                         int last_filled = userParams.Count;
 958                         int index = 0;
 959                         foreach (Parameter p in compilerParams) {
 960                                 for (int i = 0; i < last_filled; ++i) {
 961                                         while (p.Name == all_params [i].Name) {
 962                                                 if (checkConflicts && i < userParams.Count) {
 963                                                         Report.Error (316, userParams [i].Location,
 964                                                                 "The parameter name `{0}' conflicts with a compiler generated name", p.Name);
 965                                                 }
 966                                                 p.Name = '_' + p.Name;
 967                                         }
 968                                 }
 969                                 all_params [last_filled] = p;
 970                                 if (all_types != null)
 971                                         all_types [last_filled] = compilerTypes [index++];
 972                                 ++last_filled;
 973                         }
 974
 975                         ParametersCompiled parameters = new ParametersCompiled (all_params, all_types);
 976                         parameters.has_params = userParams.has_params;
 977                         return parameters;
 978                 }
 979
 980                 protected virtual void ErrorDuplicateName (Parameter p)
 981                 {
 982                         Report.Error (100, p.Location, "The parameter name `{0}' is a duplicate", p.Name);
 983                 }
 984
 985                 /// <summary>
 986                 ///    Returns the parameter information based on the name
 987                 /// </summary>
 988                 public int GetParameterIndexByName (string name)
 989                 {
 990                         for (int idx = 0; idx < Count; ++idx) {
 991                                 if (parameters [idx].Name == name)
 992                                         return idx;
 993                         }
 994
 995                         return -1;
 996                 }
 997
 998                 public bool Resolve (IResolveContext ec)
 999                 {
1000                         if (types != null)
1001                                 return true;
1002
1003                         types = new Type [Count];
1004
1005                         bool ok = true;
1006                         Parameter p;
1007                         for (int i = 0; i < FixedParameters.Length; ++i) {
1008                                 p = this [i];
1009                                 Type t = p.Resolve (ec);
1010                                 if (t == null) {
1011                                         ok = false;
1012                                         continue;
1013                                 }
1014
1015                                 types [i] = t;
1016                         }
1017
1018                         return ok;
1019                 }
1020
1021                 public void ResolveVariable ()
1022                 {
1023                         for (int i = 0; i < FixedParameters.Length; ++i) {
1024                                 this [i].ResolveVariable (i);
1025                         }
1026                 }
1027
1028                 public CallingConventions CallingConvention
1029                 {
1030                         get {
1031                                 if (HasArglist)
1032                                         return CallingConventions.VarArgs;
1033                                 else
1034                                         return CallingConventions.Standard;
1035                         }
1036                 }
1037
1038                 // Define each type attribute (in/out/ref) and
1039                 // the argument names.
1040                 public void ApplyAttributes (MethodBase builder)
1041                 {
1042                         if (Count == 0)
1043                                 return;
1044
1045                         MethodBuilder mb = builder as MethodBuilder;
1046                         ConstructorBuilder cb = builder as ConstructorBuilder;
1047
1048                         for (int i = 0; i < Count; i++) {
1049                                 this [i].ApplyAttributes (mb, cb, i + 1);
1050                         }
1051                 }
1052
1053                 public void VerifyClsCompliance ()
1054                 {
1055                         foreach (Parameter p in FixedParameters)
1056                                 p.IsClsCompliant ();
1057                 }
1058
1059                 public Parameter this [int pos] {
1060                         get { return (Parameter) parameters [pos]; }
1061                 }
1062
1063                 public Expression CreateExpressionTree (EmitContext ec, Location loc)
1064                 {
1065                         ArrayList initializers = new ArrayList (Count);
1066                         foreach (Parameter p in FixedParameters) {
1067                                 //
1068                                 // Each parameter expression is stored to local variable
1069                                 // to save some memory when referenced later.
1070                                 //
1071                                 StatementExpression se = new StatementExpression (p.CreateExpressionTreeVariable (ec));
1072                                 if (se.Resolve (ec))
1073                                         ec.CurrentBlock.AddScopeStatement (se);
1074
1075                                 initializers.Add (p.ExpressionTreeVariableReference ());
1076                         }
1077
1078                         return new ArrayCreation (
1079                                 Parameter.ResolveParameterExpressionType (ec, loc),
1080                                 "[]", initializers, loc);
1081                 }
1082
1083                 public ParametersCompiled Clone ()
1084                 {
1085                         ParametersCompiled p = (ParametersCompiled) MemberwiseClone ();
1086
1087                         p.parameters = new IParameterData [parameters.Length];
1088                         for (int i = 0; i < Count; ++i)
1089                                 p.parameters [i] = this [i].Clone ();
1090
1091                         return p;
1092                 }
1093         }
1094 }