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                         TypeManager.CheckTypeVariance (parameter_type,
 365                                 (modFlags & Parameter.Modifier.ISBYREF) != 0 ? Variance.None : Variance.Contravariant,
 366                                 ec as MemberCore);
 367
 368                         if (texpr is TypeParameterExpr)
 369                                 return parameter_type;
 370
 371                         if ((parameter_type.Attributes & Class.StaticClassAttribute) == Class.StaticClassAttribute) {
 372                                 Report.Error (721, Location, "`{0}': static types cannot be used as parameters",
 373                                         texpr.GetSignatureForError ());
 374                                 return parameter_type;
 375                         }
 376
 377                         if ((modFlags & Modifier.This) != 0 && parameter_type.IsPointer) {
 378                                 Report.Error (1103, Location, "The type of extension method cannot be `{0}'",
 379                                         TypeManager.CSharpName (parameter_type));
 380                         }
 381
 382                         return parameter_type;
 383                 }
 384
 385                 public void ResolveVariable (int idx)
 386                 {
 387                         this.idx = idx;
 388                 }
 389
 390                 public bool HasExtensionMethodModifier {
 391                         get { return (modFlags & Modifier.This) != 0; }
 392                 }
 393
 394                 public Modifier ModFlags {
 395                         get { return modFlags & ~Modifier.This; }
 396                 }
 397
 398                 public string Name {
 399                         get { return name; }
 400                         set { name = value; }
 401                 }
 402
 403                 ParameterAttributes Attributes {
 404                         get { return ParametersCompiled.GetParameterAttribute (modFlags); }
 405                 }
 406
 407                 public override AttributeTargets AttributeTargets {
 408                         get {
 409                                 return AttributeTargets.Parameter;
 410                         }
 411                 }
 412
 413                 public virtual string GetSignatureForError ()
 414                 {
 415                         string type_name;
 416                         if (parameter_type != null)
 417                                 type_name = TypeManager.CSharpName (parameter_type);
 418                         else
 419                                 type_name = TypeName.GetSignatureForError ();
 420
 421                         string mod = GetModifierSignature (modFlags);
 422                         if (mod.Length > 0)
 423                                 return String.Concat (mod, " ", type_name);
 424
 425                         return type_name;
 426                 }
 427
 428                 public static string GetModifierSignature (Modifier mod)
 429                 {
 430                         switch (mod) {
 431                         case Modifier.OUT:
 432                                 return "out";
 433                         case Modifier.PARAMS:
 434                                 return "params";
 435                         case Modifier.REF:
 436                                 return "ref";
 437                         case Modifier.This:
 438                                 return "this";
 439                         default:
 440                                 return "";
 441                         }
 442                 }
 443
 444                 public void IsClsCompliant ()
 445                 {
 446                         if (AttributeTester.IsClsCompliant (parameter_type))
 447                                 return;
 448
 449                         Report.Warning (3001, 1, Location, "Argument type `{0}' is not CLS-compliant", GetSignatureForError ());
 450                 }
 451
 452                 public virtual void ApplyAttributes (MethodBuilder mb, ConstructorBuilder cb, int index)
 453                 {
 454                         if (mb == null)
 455                                 builder = cb.DefineParameter (index, Attributes, Name);
 456                         else
 457                                 builder = mb.DefineParameter (index, Attributes, Name);
 458
 459                         if (OptAttributes != null)
 460                                 OptAttributes.Emit ();
 461                 }
 462
 463                 public override string[] ValidAttributeTargets {
 464                         get {
 465                                 return attribute_targets;
 466                         }
 467                 }
 468
 469                 public Parameter Clone ()
 470                 {
 471                         Parameter p = (Parameter) MemberwiseClone ();
 472                         if (attributes != null) {
 473                                 p.attributes = attributes.Clone ();
 474                                 p.attributes.AttachTo (p);
 475                         }
 476
 477                         return p;
 478                 }
 479
 480                 public ExpressionStatement CreateExpressionTreeVariable (EmitContext ec)
 481                 {
 482                         //
 483                         // A parameter is not hoisted when used directly as ET
 484                         //
 485                         HoistedVariableReference = null;
 486
 487                         if ((modFlags & Modifier.ISBYREF) != 0)
 488                                 Report.Error (1951, Location, "An expression tree parameter cannot use `ref' or `out' modifier");
 489
 490                         LocalInfo variable = ec.CurrentBlock.AddTemporaryVariable (
 491                                 ResolveParameterExpressionType (ec, Location), Location);
 492                         variable.Resolve (ec);
 493
 494                         expr_tree_variable = new LocalVariableReference (
 495                                 ec.CurrentBlock, variable.Name, Location, variable, false);
 496
 497                         ArrayList arguments = new ArrayList (2);
 498                         arguments.Add (new Argument (new TypeOf (
 499                                 new TypeExpression (parameter_type, Location), Location)));
 500                         arguments.Add (new Argument (new StringConstant (Name, Location)));
 501                         return new SimpleAssign (ExpressionTreeVariableReference (),
 502                                 Expression.CreateExpressionFactoryCall ("Parameter", null, arguments, Location));
 503                 }
 504
 505                 public void Emit (EmitContext ec)
 506                 {
 507                         int arg_idx = idx;
 508                         if (!ec.IsStatic)
 509                                 arg_idx++;
 510
 511                         ParameterReference.EmitLdArg (ec.ig, arg_idx);
 512                 }
 513
 514                 public void EmitAssign (EmitContext ec)
 515                 {
 516                         int arg_idx = idx;
 517                         if (!ec.IsStatic)
 518                                 arg_idx++;
 519
 520                         if (arg_idx <= 255)
 521                                 ec.ig.Emit (OpCodes.Starg_S, (byte) arg_idx);
 522                         else
 523                                 ec.ig.Emit (OpCodes.Starg, arg_idx);
 524                 }
 525
 526                 public void EmitAddressOf (EmitContext ec)
 527                 {
 528                         int arg_idx = idx;
 529
 530                         if (!ec.IsStatic)
 531                                 arg_idx++;
 532
 533                         bool is_ref = (ModFlags & Modifier.ISBYREF) != 0;
 534                         if (is_ref) {
 535                                 ParameterReference.EmitLdArg (ec.ig, arg_idx);
 536                         } else {
 537                                 if (arg_idx <= 255)
 538                                         ec.ig.Emit (OpCodes.Ldarga_S, (byte) arg_idx);
 539                                 else
 540                                         ec.ig.Emit (OpCodes.Ldarga, arg_idx);
 541                         }
 542                 }
 543
 544                 public Expression ExpressionTreeVariableReference ()
 545                 {
 546                         return expr_tree_variable;
 547                 }
 548
 549                 //
 550                 // System.Linq.Expressions.ParameterExpression type
 551                 //
 552                 public static TypeExpr ResolveParameterExpressionType (EmitContext ec, Location location)
 553                 {
 554                         if (parameter_expr_tree_type != null)
 555                                 return parameter_expr_tree_type;
 556
 557                         Type p_type = TypeManager.parameter_expression_type;
 558                         if (p_type == null) {
 559                                 p_type = TypeManager.CoreLookupType ("System.Linq.Expressions", "ParameterExpression", Kind.Class, true);
 560                                 TypeManager.parameter_expression_type = p_type;
 561                         }
 562
 563                         parameter_expr_tree_type = new TypeExpression (p_type, location).
 564                                 ResolveAsTypeTerminal (ec, false);
 565
 566                         return parameter_expr_tree_type;
 567                 }
 568         }
 569
 570         //
 571         // Imported or resolved parameter information
 572         //
 573         public class ParameterData : IParameterData
 574         {
 575                 readonly string name;
 576                 readonly Parameter.Modifier modifiers;
 577
 578                 public ParameterData (string name, Parameter.Modifier modifiers)
 579                 {
 580                         this.name = name;
 581                         this.modifiers = modifiers;
 582                 }
 583
 584                 #region IParameterData Members
 585
 586                 public bool HasExtensionMethodModifier {
 587                         get { return (modifiers & Parameter.Modifier.This) != 0; }
 588                 }
 589
 590                 public Parameter.Modifier ModFlags {
 591                         get { return modifiers & ~Parameter.Modifier.This; }
 592                 }
 593
 594                 public string Name {
 595                         get { return name; }
 596                 }
 597
 598                 #endregion
 599         }
 600
 601         public abstract class AParametersCollection
 602         {
 603                 protected bool has_arglist;
 604                 protected bool has_params;
 605
 606                 // Null object pattern
 607                 protected IParameterData [] parameters;
 608                 protected Type [] types;
 609
 610                 public int Count {
 611                         get { return parameters.Length; }
 612                 }
 613
 614                 public Type ExtensionMethodType {
 615                         get {
 616                                 if (Count == 0)
 617                                         return null;
 618
 619                                 return FixedParameters [0].HasExtensionMethodModifier ?
 620                                         types [0] : null;
 621                         }
 622                 }
 623
 624                 public IParameterData [] FixedParameters {
 625                         get {
 626                                 return parameters;
 627                         }
 628                 }
 629
 630                 public static ParameterAttributes GetParameterAttribute (Parameter.Modifier modFlags)
 631                 {
 632                         return (modFlags & Parameter.Modifier.OUT) == Parameter.Modifier.OUT ?
 633                                 ParameterAttributes.Out : ParameterAttributes.None;
 634                 }
 635
 636                 public Type [] GetEmitTypes ()
 637                 {
 638                         Type [] types = null;
 639                         if (has_arglist) {
 640                                 if (Count == 1)
 641                                         return Type.EmptyTypes;
 642
 643                                 types = new Type [Count - 1];
 644                                 Array.Copy (Types, types, types.Length);
 645                         }
 646
 647                         for (int i = 0; i < Count; ++i) {
 648                                 if ((FixedParameters [i].ModFlags & Parameter.Modifier.ISBYREF) == 0)
 649                                         continue;
 650
 651                                 if (types == null)
 652                                         types = (Type []) Types.Clone ();
 653
 654                                 types [i] = TypeManager.GetReferenceType (types [i]);
 655                         }
 656
 657                         if (types == null)
 658                                 types = Types;
 659
 660                         return types;
 661                 }
 662
 663                 public string GetSignatureForError ()
 664                 {
 665                         StringBuilder sb = new StringBuilder ("(");
 666                         for (int i = 0; i < Count; ++i) {
 667                                 if (i != 0)
 668                                         sb.Append (", ");
 669                                 sb.Append (ParameterDesc (i));
 670                         }
 671                         sb.Append (')');
 672                         return sb.ToString ();
 673                 }
 674
 675                 public bool HasArglist {
 676                         get { return has_arglist; }
 677                 }
 678
 679                 public bool HasExtensionMethodType {
 680                         get {
 681                                 if (Count == 0)
 682                                         return false;
 683
 684                                 return FixedParameters [0].HasExtensionMethodModifier;
 685                         }
 686                 }
 687
 688                 public bool HasParams {
 689                         get { return has_params; }
 690                 }
 691
 692                 public bool IsEmpty {
 693                         get { return parameters.Length == 0; }
 694                 }
 695
 696                 public string ParameterDesc (int pos)
 697                 {
 698                         if (types == null || types [pos] == null)
 699                                 return ((Parameter)FixedParameters [pos]).GetSignatureForError ();
 700
 701                         string type = TypeManager.CSharpName (types [pos]);
 702                         if (FixedParameters [pos].HasExtensionMethodModifier)
 703                                 return "this " + type;
 704
 705                         Parameter.Modifier mod = FixedParameters [pos].ModFlags & ~Parameter.Modifier.ARGLIST;
 706                         if (mod == 0)
 707                                 return type;
 708
 709                         return Parameter.GetModifierSignature (mod) + " " + type;
 710                 }
 711
 712                 public Type[] Types {
 713                         get { return types; }
 714                         set { types = value; }
 715                 }
 716
 717 #if MS_COMPATIBLE
 718                 public AParametersCollection InflateTypes (Type[] genArguments, Type[] argTypes)
 719                 {
 720                         AParametersCollection p = (AParametersCollection) MemberwiseClone (); // Clone ();
 721
 722                         for (int i = 0; i < Count; ++i) {
 723                                 if (types[i].IsGenericType) {
 724                                         Type[] gen_arguments_open = new Type[types[i].GetGenericTypeDefinition ().GetGenericArguments ().Length];
 725                                         Type[] gen_arguments = types[i].GetGenericArguments ();
 726                                         for (int ii = 0; ii < gen_arguments_open.Length; ++ii) {
 727                                                 if (gen_arguments[ii].IsGenericParameter) {
 728                                                         Type t = argTypes[gen_arguments[ii].GenericParameterPosition];
 729                                                         gen_arguments_open[ii] = t;
 730                                                 } else
 731                                                         gen_arguments_open[ii] = gen_arguments[ii];
 732                                         }
 733
 734                                         p.types[i] = types[i].GetGenericTypeDefinition ().MakeGenericType (gen_arguments_open);
 735                                         continue;
 736                                 }
 737
 738                                 if (types[i].IsGenericParameter) {
 739                                         Type gen_argument = argTypes[types[i].GenericParameterPosition];
 740                                         p.types[i] = gen_argument;
 741                                         continue;
 742                                 }
 743                         }
 744
 745                         return p;
 746                 }
 747 #endif
 748         }
 749
 750         //
 751         // A collection of imported or resolved parameters
 752         //
 753         public class ParametersImported : AParametersCollection
 754         {
 755                 ParametersImported (AParametersCollection param, Type[] types)
 756                 {
 757                         this.parameters = param.FixedParameters;
 758                         this.types = types;
 759                         has_arglist = param.HasArglist;
 760                         has_params = param.HasParams;
 761                 }
 762
 763                 ParametersImported (IParameterData [] parameters, Type [] types, MethodBase method, bool hasParams)
 764                 {
 765                         this.parameters = parameters;
 766                         this.types = types;
 767                         has_arglist = (method.CallingConvention & CallingConventions.VarArgs) != 0;
 768                         if (has_arglist) {
 769                                 this.parameters = new IParameterData [parameters.Length + 1];
 770                                 parameters.CopyTo (this.parameters, 0);
 771                                 this.parameters [parameters.Length] = new ArglistParameter (Location.Null);
 772                                 this.types = new Type [types.Length + 1];
 773                                 types.CopyTo (this.types, 0);
 774                                 this.types [types.Length] = TypeManager.arg_iterator_type;
 775                         }
 776                         has_params = hasParams;
 777                 }
 778
 779                 public ParametersImported (IParameterData [] param, Type[] types)
 780                 {
 781                         this.parameters = param;
 782                         this.types = types;
 783                 }
 784
 785                 public static AParametersCollection Create (MethodBase method)
 786                 {
 787                         return Create (method.GetParameters (), method);
 788                 }
 789
 790                 //
 791                 // Generic method parameters importer, param is shared between all instances
 792                 //
 793                 public static AParametersCollection Create (AParametersCollection param, MethodBase method)
 794                 {
 795                         if (param.IsEmpty)
 796                                 return param;
 797
 798                         ParameterInfo [] pi = method.GetParameters ();
 799                         Type [] types = new Type [pi.Length];
 800                         for (int i = 0; i < types.Length; i++) {
 801                                 Type t = pi [i].ParameterType;
 802                                 if (t.IsByRef)
 803                                         t = TypeManager.GetElementType (t);
 804
 805                                 types [i] = TypeManager.TypeToCoreType (t);
 806                         }
 807
 808                         return new ParametersImported (param, types);
 809                 }
 810
 811                 //
 812                 // Imports SRE parameters
 813                 //
 814                 public static AParametersCollection Create (ParameterInfo [] pi, MethodBase method)
 815                 {
 816                         if (pi.Length == 0) {
 817                                 if (method != null && (method.CallingConvention & CallingConventions.VarArgs) != 0)
 818                                         return new ParametersImported (new IParameterData [0], Type.EmptyTypes, method, false);
 819
 820                                 return ParametersCompiled.EmptyReadOnlyParameters;
 821                         }
 822
 823                         Type [] types = new Type [pi.Length];
 824                         IParameterData [] par = new IParameterData [pi.Length];
 825                         bool is_params = false;
 826                         PredefinedAttribute extension_attr = PredefinedAttributes.Get.Extension;
 827                         PredefinedAttribute param_attr = PredefinedAttributes.Get.ParamArray;
 828                         for (int i = 0; i < types.Length; i++) {
 829                                 types [i] = TypeManager.TypeToCoreType (pi [i].ParameterType);
 830
 831                                 ParameterInfo p = pi [i];
 832                                 Parameter.Modifier mod = 0;
 833                                 if (types [i].IsByRef) {
 834                                         if ((p.Attributes & (ParameterAttributes.Out | ParameterAttributes.In)) == ParameterAttributes.Out)
 835                                                 mod = Parameter.Modifier.OUT;
 836                                         else
 837                                                 mod = Parameter.Modifier.REF;
 838
 839                                         //
 840                                         // Strip reference wrapping
 841                                         //
 842                                         types [i] = TypeManager.GetElementType (types [i]);
 843                                 } else if (i == 0 && extension_attr.IsDefined && method != null && method.IsStatic &&
 844                                 (method.DeclaringType.Attributes & Class.StaticClassAttribute) == Class.StaticClassAttribute &&
 845                                         method.IsDefined (extension_attr.Type, false)) {
 846                                         mod = Parameter.Modifier.This;
 847                                 } else if (i >= pi.Length - 2) {
 848                                         if (types[i].IsArray) {
 849                                                 if (p.IsDefined (param_attr.Type, false)) {
 850                                                         mod = Parameter.Modifier.PARAMS;
 851                                                         is_params = true;
 852                                                 }
 853                                         } else if (types [i] == TypeManager.runtime_argument_handle_type) {
 854                                                 par [i] = new ArglistParameter (Location.Null);
 855                                                 continue;
 856                                         }
 857                                 }
 858
 859                                 par [i] = new ParameterData (p.Name, mod);
 860                         }
 861
 862                         return method != null ?
 863                                 new ParametersImported (par, types, method, is_params) :
 864                                 new ParametersImported (par, types);
 865                 }
 866         }
 867
 868         /// <summary>
 869         ///   Represents the methods parameters
 870         /// </summary>
 871         public class ParametersCompiled : AParametersCollection
 872         {
 873                 public static readonly ParametersCompiled EmptyReadOnlyParameters = new ParametersCompiled ();
 874
 875                 // Used by C# 2.0 delegates
 876                 public static readonly ParametersCompiled Undefined = new ParametersCompiled ();
 877
 878                 private ParametersCompiled ()
 879                 {
 880                         parameters = new Parameter [0];
 881                         types = Type.EmptyTypes;
 882                 }
 883
 884                 private ParametersCompiled (Parameter [] parameters, Type [] types)
 885                 {
 886                         this.parameters = parameters;
 887                     this.types = types;
 888                 }
 889
 890                 public ParametersCompiled (params Parameter[] parameters)
 891                 {
 892                         if (parameters == null)
 893                                 throw new ArgumentException ("Use EmptyReadOnlyParameters");
 894
 895                         this.parameters = parameters;
 896                         int count = parameters.Length;
 897
 898                         if (count == 0)
 899                                 return;
 900
 901                         if (count == 1) {
 902                                 has_params = (parameters [0].ModFlags & Parameter.Modifier.PARAMS) != 0;
 903                                 return;
 904                         }
 905
 906                         for (int i = 0; i < count; i++){
 907                                 string base_name = parameters [i].Name;
 908                                 has_params |= (parameters [i].ModFlags & Parameter.Modifier.PARAMS) != 0;
 909
 910                                 for (int j = i + 1; j < count; j++){
 911                                         if (base_name != parameters [j].Name)
 912                                                 continue;
 913
 914                                         ErrorDuplicateName (parameters [i]);
 915                                         i = j;
 916                                 }
 917                         }
 918                 }
 919
 920                 public ParametersCompiled (Parameter [] parameters, bool has_arglist) :
 921                         this (parameters)
 922                 {
 923                         this.has_arglist = has_arglist;
 924                 }
 925
 926                 public static ParametersCompiled CreateFullyResolved (Parameter p, Type type)
 927                 {
 928                         return new ParametersCompiled (new Parameter [] { p }, new Type [] { type });
 929                 }
 930
 931                 public static ParametersCompiled CreateFullyResolved (Parameter[] parameters, Type[] types)
 932                 {
 933                         return new ParametersCompiled (parameters, types);
 934                 }
 935
 936                 public static ParametersCompiled MergeGenerated (ParametersCompiled userParams, bool checkConflicts, Parameter compilerParams, Type compilerTypes)
 937                 {
 938                         return MergeGenerated (userParams, checkConflicts,
 939                                 new Parameter [] { compilerParams },
 940                                 new Type [] { compilerTypes });
 941                 }
 942
 943                 //
 944                 // Use this method when you merge compiler generated parameters with user parameters
 945                 //
 946                 public static ParametersCompiled MergeGenerated (ParametersCompiled userParams, bool checkConflicts, Parameter[] compilerParams, Type[] compilerTypes)
 947                 {
 948                         Parameter[] all_params = new Parameter [userParams.Count + compilerParams.Length];
 949                         userParams.FixedParameters.CopyTo(all_params, 0);
 950
 951                         Type [] all_types;
 952                         if (userParams.types != null) {
 953                                 all_types = new Type [all_params.Length];
 954                                 userParams.Types.CopyTo (all_types, 0);
 955                         } else {
 956                                 all_types = null;
 957                         }
 958
 959                         int last_filled = userParams.Count;
 960                         int index = 0;
 961                         foreach (Parameter p in compilerParams) {
 962                                 for (int i = 0; i < last_filled; ++i) {
 963                                         while (p.Name == all_params [i].Name) {
 964                                                 if (checkConflicts && i < userParams.Count) {
 965                                                         Report.Error (316, userParams [i].Location,
 966                                                                 "The parameter name `{0}' conflicts with a compiler generated name", p.Name);
 967                                                 }
 968                                                 p.Name = '_' + p.Name;
 969                                         }
 970                                 }
 971                                 all_params [last_filled] = p;
 972                                 if (all_types != null)
 973                                         all_types [last_filled] = compilerTypes [index++];
 974                                 ++last_filled;
 975                         }
 976
 977                         ParametersCompiled parameters = new ParametersCompiled (all_params, all_types);
 978                         parameters.has_params = userParams.has_params;
 979                         return parameters;
 980                 }
 981
 982                 protected virtual void ErrorDuplicateName (Parameter p)
 983                 {
 984                         Report.Error (100, p.Location, "The parameter name `{0}' is a duplicate", p.Name);
 985                 }
 986
 987                 /// <summary>
 988                 ///    Returns the parameter information based on the name
 989                 /// </summary>
 990                 public int GetParameterIndexByName (string name)
 991                 {
 992                         for (int idx = 0; idx < Count; ++idx) {
 993                                 if (parameters [idx].Name == name)
 994                                         return idx;
 995                         }
 996
 997                         return -1;
 998                 }
 999
1000                 public bool Resolve (IResolveContext ec)
1001                 {
1002                         if (types != null)
1003                                 return true;
1004
1005                         types = new Type [Count];
1006
1007                         bool ok = true;
1008                         Parameter p;
1009                         for (int i = 0; i < FixedParameters.Length; ++i) {
1010                                 p = this [i];
1011                                 Type t = p.Resolve (ec);
1012                                 if (t == null) {
1013                                         ok = false;
1014                                         continue;
1015                                 }
1016
1017                                 types [i] = t;
1018                         }
1019
1020                         return ok;
1021                 }
1022
1023                 public void ResolveVariable ()
1024                 {
1025                         for (int i = 0; i < FixedParameters.Length; ++i) {
1026                                 this [i].ResolveVariable (i);
1027                         }
1028                 }
1029
1030                 public CallingConventions CallingConvention
1031                 {
1032                         get {
1033                                 if (HasArglist)
1034                                         return CallingConventions.VarArgs;
1035                                 else
1036                                         return CallingConventions.Standard;
1037                         }
1038                 }
1039
1040                 // Define each type attribute (in/out/ref) and
1041                 // the argument names.
1042                 public void ApplyAttributes (MethodBase builder)
1043                 {
1044                         if (Count == 0)
1045                                 return;
1046
1047                         MethodBuilder mb = builder as MethodBuilder;
1048                         ConstructorBuilder cb = builder as ConstructorBuilder;
1049
1050                         for (int i = 0; i < Count; i++) {
1051                                 this [i].ApplyAttributes (mb, cb, i + 1);
1052                         }
1053                 }
1054
1055                 public void VerifyClsCompliance ()
1056                 {
1057                         foreach (Parameter p in FixedParameters)
1058                                 p.IsClsCompliant ();
1059                 }
1060
1061                 public Parameter this [int pos] {
1062                         get { return (Parameter) parameters [pos]; }
1063                 }
1064
1065                 public Expression CreateExpressionTree (EmitContext ec, Location loc)
1066                 {
1067                         ArrayList initializers = new ArrayList (Count);
1068                         foreach (Parameter p in FixedParameters) {
1069                                 //
1070                                 // Each parameter expression is stored to local variable
1071                                 // to save some memory when referenced later.
1072                                 //
1073                                 StatementExpression se = new StatementExpression (p.CreateExpressionTreeVariable (ec));
1074                                 if (se.Resolve (ec))
1075                                         ec.CurrentBlock.AddScopeStatement (se);
1076
1077                                 initializers.Add (p.ExpressionTreeVariableReference ());
1078                         }
1079
1080                         return new ArrayCreation (
1081                                 Parameter.ResolveParameterExpressionType (ec, loc),
1082                                 "[]", initializers, loc);
1083                 }
1084
1085                 public ParametersCompiled Clone ()
1086                 {
1087                         ParametersCompiled p = (ParametersCompiled) MemberwiseClone ();
1088
1089                         p.parameters = new IParameterData [parameters.Length];
1090                         for (int i = 0; i < Count; ++i)
1091                                 p.parameters [i] = this [i].Clone ();
1092
1093                         return p;
1094                 }
1095         }
1096 }