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, "");
 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 #if GMCS_SOURCE
 365                         if (parameter_type.IsGenericParameter) {
 366                                 AbstractPropertyEventMethod accessor = ec as AbstractPropertyEventMethod;
 367                                 if (accessor == null || !accessor.IsDummy) {
 368                                         if ((parameter_type.GenericParameterAttributes & GenericParameterAttributes.Covariant) != 0) {
 369                                                 Report.Error (-38, Location, "Covariant type parameters cannot be used as method parameters");
 370                                                 return null;
 371                                         } else if ((ModFlags & Modifier.ISBYREF) != 0 &&
 372                                                    (parameter_type.GenericParameterAttributes & GenericParameterAttributes.Contravariant) != 0) {
 373                                                 Report.Error (-37, Location, "Contravariant type parameters cannot be used in output positions");
 374                                                 return null;
 375                                         }
 376                                 }
 377                                 return parameter_type;
 378                         }
 379 #endif
 380
 381                         if ((parameter_type.Attributes & Class.StaticClassAttribute) == Class.StaticClassAttribute) {
 382                                 Report.Error (721, Location, "`{0}': static types cannot be used as parameters",
 383                                         texpr.GetSignatureForError ());
 384                                 return parameter_type;
 385                         }
 386
 387                         if ((modFlags & Modifier.This) != 0 && parameter_type.IsPointer) {
 388                                 Report.Error (1103, Location, "The type of extension method cannot be `{0}'",
 389                                         TypeManager.CSharpName (parameter_type));
 390                         }
 391
 392                         return parameter_type;
 393                 }
 394
 395                 public void ResolveVariable (int idx)
 396                 {
 397                         this.idx = idx;
 398                 }
 399
 400                 public bool HasExtensionMethodModifier {
 401                         get { return (modFlags & Modifier.This) != 0; }
 402                 }
 403
 404                 public Modifier ModFlags {
 405                         get { return modFlags & ~Modifier.This; }
 406                 }
 407
 408                 public string Name {
 409                         get { return name; }
 410                         set { name = value; }
 411                 }
 412
 413                 ParameterAttributes Attributes {
 414                         get { return ParametersCompiled.GetParameterAttribute (modFlags); }
 415                 }
 416
 417                 public override AttributeTargets AttributeTargets {
 418                         get {
 419                                 return AttributeTargets.Parameter;
 420                         }
 421                 }
 422
 423                 public virtual string GetSignatureForError ()
 424                 {
 425                         string type_name;
 426                         if (parameter_type != null)
 427                                 type_name = TypeManager.CSharpName (parameter_type);
 428                         else
 429                                 type_name = TypeName.GetSignatureForError ();
 430
 431                         string mod = GetModifierSignature (modFlags);
 432                         if (mod.Length > 0)
 433                                 return String.Concat (mod, " ", type_name);
 434
 435                         return type_name;
 436                 }
 437
 438                 public static string GetModifierSignature (Modifier mod)
 439                 {
 440                         switch (mod) {
 441                         case Modifier.OUT:
 442                                 return "out";
 443                         case Modifier.PARAMS:
 444                                 return "params";
 445                         case Modifier.REF:
 446                                 return "ref";
 447                         case Modifier.This:
 448                                 return "this";
 449                         default:
 450                                 return "";
 451                         }
 452                 }
 453
 454                 public void IsClsCompliant ()
 455                 {
 456                         if (AttributeTester.IsClsCompliant (parameter_type))
 457                                 return;
 458
 459                         Report.Warning (3001, 1, Location, "Argument type `{0}' is not CLS-compliant", GetSignatureForError ());
 460                 }
 461
 462                 public virtual void ApplyAttributes (MethodBuilder mb, ConstructorBuilder cb, int index)
 463                 {
 464                         if (mb == null)
 465                                 builder = cb.DefineParameter (index, Attributes, Name);
 466                         else
 467                                 builder = mb.DefineParameter (index, Attributes, Name);
 468
 469                         if (OptAttributes != null)
 470                                 OptAttributes.Emit ();
 471                 }
 472
 473                 public override string[] ValidAttributeTargets {
 474                         get {
 475                                 return attribute_targets;
 476                         }
 477                 }
 478
 479                 public Parameter Clone ()
 480                 {
 481                         Parameter p = (Parameter) MemberwiseClone ();
 482                         if (attributes != null) {
 483                                 p.attributes = attributes.Clone ();
 484                                 p.attributes.AttachTo (p);
 485                         }
 486
 487                         return p;
 488                 }
 489
 490                 public ExpressionStatement CreateExpressionTreeVariable (EmitContext ec)
 491                 {
 492                         //
 493                         // A parameter is not hoisted when used directly as ET
 494                         //
 495                         HoistedVariableReference = null;
 496
 497                         if ((modFlags & Modifier.ISBYREF) != 0)
 498                                 Report.Error (1951, Location, "An expression tree parameter cannot use `ref' or `out' modifier");
 499
 500                         LocalInfo variable = ec.CurrentBlock.AddTemporaryVariable (
 501                                 ResolveParameterExpressionType (ec, Location), Location);
 502                         variable.Resolve (ec);
 503
 504                         expr_tree_variable = new LocalVariableReference (
 505                                 ec.CurrentBlock, variable.Name, Location, variable, false);
 506
 507                         ArrayList arguments = new ArrayList (2);
 508                         arguments.Add (new Argument (new TypeOf (
 509                                 new TypeExpression (parameter_type, Location), Location)));
 510                         arguments.Add (new Argument (new StringConstant (Name, Location)));
 511                         return new SimpleAssign (ExpressionTreeVariableReference (),
 512                                 Expression.CreateExpressionFactoryCall ("Parameter", null, arguments, Location));
 513                 }
 514
 515                 public void Emit (EmitContext ec)
 516                 {
 517                         int arg_idx = idx;
 518                         if (!ec.IsStatic)
 519                                 arg_idx++;
 520
 521                         ParameterReference.EmitLdArg (ec.ig, arg_idx);
 522                 }
 523
 524                 public void EmitAssign (EmitContext ec)
 525                 {
 526                         int arg_idx = idx;
 527                         if (!ec.IsStatic)
 528                                 arg_idx++;
 529
 530                         if (arg_idx <= 255)
 531                                 ec.ig.Emit (OpCodes.Starg_S, (byte) arg_idx);
 532                         else
 533                                 ec.ig.Emit (OpCodes.Starg, arg_idx);
 534                 }
 535
 536                 public void EmitAddressOf (EmitContext ec)
 537                 {
 538                         int arg_idx = idx;
 539
 540                         if (!ec.IsStatic)
 541                                 arg_idx++;
 542
 543                         bool is_ref = (ModFlags & Modifier.ISBYREF) != 0;
 544                         if (is_ref) {
 545                                 ParameterReference.EmitLdArg (ec.ig, arg_idx);
 546                         } else {
 547                                 if (arg_idx <= 255)
 548                                         ec.ig.Emit (OpCodes.Ldarga_S, (byte) arg_idx);
 549                                 else
 550                                         ec.ig.Emit (OpCodes.Ldarga, arg_idx);
 551                         }
 552                 }
 553
 554                 public Expression ExpressionTreeVariableReference ()
 555                 {
 556                         return expr_tree_variable;
 557                 }
 558
 559                 //
 560                 // System.Linq.Expressions.ParameterExpression type
 561                 //
 562                 public static TypeExpr ResolveParameterExpressionType (EmitContext ec, Location location)
 563                 {
 564                         if (parameter_expr_tree_type != null)
 565                                 return parameter_expr_tree_type;
 566
 567                         Type p_type = TypeManager.parameter_expression_type;
 568                         if (p_type == null) {
 569                                 p_type = TypeManager.CoreLookupType ("System.Linq.Expressions", "ParameterExpression", Kind.Class, true);
 570                                 TypeManager.parameter_expression_type = p_type;
 571                         }
 572
 573                         parameter_expr_tree_type = new TypeExpression (p_type, location).
 574                                 ResolveAsTypeTerminal (ec, false);
 575
 576                         return parameter_expr_tree_type;
 577                 }
 578         }
 579
 580         //
 581         // Imported or resolved parameter information
 582         //
 583         public class ParameterData : IParameterData
 584         {
 585                 readonly string name;
 586                 readonly Parameter.Modifier modifiers;
 587
 588                 public ParameterData (string name, Parameter.Modifier modifiers)
 589                 {
 590                         this.name = name;
 591                         this.modifiers = modifiers;
 592                 }
 593
 594                 #region IParameterData Members
 595
 596                 public bool HasExtensionMethodModifier {
 597                         get { return (modifiers & Parameter.Modifier.This) != 0; }
 598                 }
 599
 600                 public Parameter.Modifier ModFlags {
 601                         get { return modifiers & ~Parameter.Modifier.This; }
 602                 }
 603
 604                 public string Name {
 605                         get { return name; }
 606                 }
 607
 608                 #endregion
 609         }
 610
 611         public abstract class AParametersCollection
 612         {
 613                 protected bool has_arglist;
 614                 protected bool has_params;
 615
 616                 // Null object pattern
 617                 protected IParameterData [] parameters;
 618                 protected Type [] types;
 619
 620                 public int Count {
 621                         get { return parameters.Length; }
 622                 }
 623
 624                 public Type ExtensionMethodType {
 625                         get {
 626                                 if (Count == 0)
 627                                         return null;
 628
 629                                 return FixedParameters [0].HasExtensionMethodModifier ?
 630                                         types [0] : null;
 631                         }
 632                 }
 633
 634                 public IParameterData [] FixedParameters {
 635                         get {
 636                                 return parameters;
 637                         }
 638                 }
 639
 640                 public static ParameterAttributes GetParameterAttribute (Parameter.Modifier modFlags)
 641                 {
 642                         return (modFlags & Parameter.Modifier.OUT) == Parameter.Modifier.OUT ?
 643                                 ParameterAttributes.Out : ParameterAttributes.None;
 644                 }
 645
 646                 public Type [] GetEmitTypes ()
 647                 {
 648                         Type [] types = null;
 649                         if (has_arglist) {
 650                                 if (Count == 1)
 651                                         return Type.EmptyTypes;
 652
 653                                 types = new Type [Count - 1];
 654                                 Array.Copy (Types, types, types.Length);
 655                         }
 656
 657                         for (int i = 0; i < Count; ++i) {
 658                                 if ((FixedParameters [i].ModFlags & Parameter.Modifier.ISBYREF) == 0)
 659                                         continue;
 660
 661                                 if (types == null)
 662                                         types = (Type []) Types.Clone ();
 663
 664                                 types [i] = TypeManager.GetReferenceType (types [i]);
 665                         }
 666
 667                         if (types == null)
 668                                 types = Types;
 669
 670                         return types;
 671                 }
 672
 673                 public string GetSignatureForError ()
 674                 {
 675                         StringBuilder sb = new StringBuilder ("(");
 676                         for (int i = 0; i < Count; ++i) {
 677                                 if (i != 0)
 678                                         sb.Append (", ");
 679                                 sb.Append (ParameterDesc (i));
 680                         }
 681                         sb.Append (')');
 682                         return sb.ToString ();
 683                 }
 684
 685                 public bool HasArglist {
 686                         get { return has_arglist; }
 687                 }
 688
 689                 public bool HasExtensionMethodType {
 690                         get {
 691                                 if (Count == 0)
 692                                         return false;
 693
 694                                 return FixedParameters [0].HasExtensionMethodModifier;
 695                         }
 696                 }
 697
 698                 public bool HasParams {
 699                         get { return has_params; }
 700                 }
 701
 702                 public bool IsEmpty {
 703                         get { return parameters.Length == 0; }
 704                 }
 705
 706                 public string ParameterDesc (int pos)
 707                 {
 708                         if (types == null || types [pos] == null)
 709                                 return ((Parameter)FixedParameters [pos]).GetSignatureForError ();
 710
 711                         string type = TypeManager.CSharpName (types [pos]);
 712                         if (FixedParameters [pos].HasExtensionMethodModifier)
 713                                 return "this " + type;
 714
 715                         Parameter.Modifier mod = FixedParameters [pos].ModFlags & ~Parameter.Modifier.ARGLIST;
 716                         if (mod == 0)
 717                                 return type;
 718
 719                         return Parameter.GetModifierSignature (mod) + " " + type;
 720                 }
 721
 722                 public Type[] Types {
 723                         get { return types; }
 724                         set { types = value; }
 725                 }
 726
 727 #if MS_COMPATIBLE
 728                 public AParametersCollection InflateTypes (Type[] genArguments, Type[] argTypes)
 729                 {
 730                         AParametersCollection p = (AParametersCollection) MemberwiseClone (); // Clone ();
 731
 732                         for (int i = 0; i < Count; ++i) {
 733                                 if (types[i].IsGenericType) {
 734                                         Type[] gen_arguments_open = new Type[types[i].GetGenericTypeDefinition ().GetGenericArguments ().Length];
 735                                         Type[] gen_arguments = types[i].GetGenericArguments ();
 736                                         for (int ii = 0; ii < gen_arguments_open.Length; ++ii) {
 737                                                 if (gen_arguments[ii].IsGenericParameter) {
 738                                                         Type t = argTypes[gen_arguments[ii].GenericParameterPosition];
 739                                                         gen_arguments_open[ii] = t;
 740                                                 } else
 741                                                         gen_arguments_open[ii] = gen_arguments[ii];
 742                                         }
 743
 744                                         p.types[i] = types[i].GetGenericTypeDefinition ().MakeGenericType (gen_arguments_open);
 745                                         continue;
 746                                 }
 747
 748                                 if (types[i].IsGenericParameter) {
 749                                         Type gen_argument = argTypes[types[i].GenericParameterPosition];
 750                                         p.types[i] = gen_argument;
 751                                         continue;
 752                                 }
 753                         }
 754
 755                         return p;
 756                 }
 757 #endif
 758         }
 759
 760         //
 761         // A collection of imported or resolved parameters
 762         //
 763         public class ParametersImported : AParametersCollection
 764         {
 765                 ParametersImported (AParametersCollection param, Type[] types)
 766                 {
 767                         this.parameters = param.FixedParameters;
 768                         this.types = types;
 769                         has_arglist = param.HasArglist;
 770                         has_params = param.HasParams;
 771                 }
 772
 773                 ParametersImported (IParameterData [] parameters, Type [] types, MethodBase method, bool hasParams)
 774                 {
 775                         this.parameters = parameters;
 776                         this.types = types;
 777                         has_arglist = (method.CallingConvention & CallingConventions.VarArgs) != 0;
 778                         if (has_arglist) {
 779                                 this.parameters = new IParameterData [parameters.Length + 1];
 780                                 parameters.CopyTo (this.parameters, 0);
 781                                 this.parameters [parameters.Length] = new ArglistParameter (Location.Null);
 782                                 this.types = new Type [types.Length + 1];
 783                                 types.CopyTo (this.types, 0);
 784                                 this.types [types.Length] = TypeManager.arg_iterator_type;
 785                         }
 786                         has_params = hasParams;
 787                 }
 788
 789                 public ParametersImported (IParameterData [] param, Type[] types)
 790                 {
 791                         this.parameters = param;
 792                         this.types = types;
 793                 }
 794
 795                 public static AParametersCollection Create (MethodBase method)
 796                 {
 797                         return Create (method.GetParameters (), method);
 798                 }
 799
 800                 //
 801                 // Generic method parameters importer, param is shared between all instances
 802                 //
 803                 public static AParametersCollection Create (AParametersCollection param, MethodBase method)
 804                 {
 805                         if (param.IsEmpty)
 806                                 return param;
 807
 808                         ParameterInfo [] pi = method.GetParameters ();
 809                         Type [] types = new Type [pi.Length];
 810                         for (int i = 0; i < types.Length; i++) {
 811                                 Type t = pi [i].ParameterType;
 812                                 if (t.IsByRef)
 813                                         t = TypeManager.GetElementType (t);
 814
 815                                 types [i] = TypeManager.TypeToCoreType (t);
 816                         }
 817
 818                         return new ParametersImported (param, types);
 819                 }
 820
 821                 //
 822                 // Imports SRE parameters
 823                 //
 824                 public static AParametersCollection Create (ParameterInfo [] pi, MethodBase method)
 825                 {
 826                         if (pi.Length == 0) {
 827                                 if (method != null && (method.CallingConvention & CallingConventions.VarArgs) != 0)
 828                                         return new ParametersImported (new IParameterData [0], Type.EmptyTypes, method, false);
 829
 830                                 return ParametersCompiled.EmptyReadOnlyParameters;
 831                         }
 832
 833                         Type [] types = new Type [pi.Length];
 834                         IParameterData [] par = new IParameterData [pi.Length];
 835                         bool is_params = false;
 836                         PredefinedAttribute extension_attr = PredefinedAttributes.Get.Extension;
 837                         PredefinedAttribute param_attr = PredefinedAttributes.Get.ParamArray;
 838                         for (int i = 0; i < types.Length; i++) {
 839                                 types [i] = TypeManager.TypeToCoreType (pi [i].ParameterType);
 840
 841                                 ParameterInfo p = pi [i];
 842                                 Parameter.Modifier mod = 0;
 843                                 if (types [i].IsByRef) {
 844                                         if ((p.Attributes & (ParameterAttributes.Out | ParameterAttributes.In)) == ParameterAttributes.Out)
 845                                                 mod = Parameter.Modifier.OUT;
 846                                         else
 847                                                 mod = Parameter.Modifier.REF;
 848
 849                                         //
 850                                         // Strip reference wrapping
 851                                         //
 852                                         types [i] = TypeManager.GetElementType (types [i]);
 853                                 } else if (i == 0 && extension_attr.IsDefined && method != null && method.IsStatic &&
 854                                 (method.DeclaringType.Attributes & Class.StaticClassAttribute) == Class.StaticClassAttribute &&
 855                                         method.IsDefined (extension_attr.Type, false)) {
 856                                         mod = Parameter.Modifier.This;
 857                                 } else if (i >= pi.Length - 2 && types [i].IsArray) {
 858                                         if (p.IsDefined (param_attr.Type, false)) {
 859                                                 mod = Parameter.Modifier.PARAMS;
 860                                                 is_params = true;
 861                                         }
 862                                 }
 863
 864                                 par [i] = new ParameterData (p.Name, mod);
 865                         }
 866
 867                         return method != null ?
 868                                 new ParametersImported (par, types, method, is_params) :
 869                                 new ParametersImported (par, types);
 870                 }
 871         }
 872
 873         /// <summary>
 874         ///   Represents the methods parameters
 875         /// </summary>
 876         public class ParametersCompiled : AParametersCollection
 877         {
 878                 public static readonly ParametersCompiled EmptyReadOnlyParameters = new ParametersCompiled ();
 879
 880                 // Used by C# 2.0 delegates
 881                 public static readonly ParametersCompiled Undefined = new ParametersCompiled ();
 882
 883                 private ParametersCompiled ()
 884                 {
 885                         parameters = new Parameter [0];
 886                         types = Type.EmptyTypes;
 887                 }
 888
 889                 private ParametersCompiled (Parameter [] parameters, Type [] types)
 890                 {
 891                         this.parameters = parameters;
 892                     this.types = types;
 893                 }
 894
 895                 public ParametersCompiled (params Parameter[] parameters)
 896                 {
 897                         if (parameters == null)
 898                                 throw new ArgumentException ("Use EmptyReadOnlyParameters");
 899
 900                         this.parameters = parameters;
 901                         int count = parameters.Length;
 902
 903                         if (count == 0)
 904                                 return;
 905
 906                         if (count == 1) {
 907                                 has_params = (parameters [0].ModFlags & Parameter.Modifier.PARAMS) != 0;
 908                                 return;
 909                         }
 910
 911                         for (int i = 0; i < count; i++){
 912                                 string base_name = parameters [i].Name;
 913                                 has_params |= (parameters [i].ModFlags & Parameter.Modifier.PARAMS) != 0;
 914
 915                                 for (int j = i + 1; j < count; j++){
 916                                         if (base_name != parameters [j].Name)
 917                                                 continue;
 918
 919                                         ErrorDuplicateName (parameters [i]);
 920                                         i = j;
 921                                 }
 922                         }
 923                 }
 924
 925                 public ParametersCompiled (Parameter [] parameters, bool has_arglist) :
 926                         this (parameters)
 927                 {
 928                         this.has_arglist = has_arglist;
 929                 }
 930
 931                 public static ParametersCompiled CreateFullyResolved (Parameter p, Type type)
 932                 {
 933                         return new ParametersCompiled (new Parameter [] { p }, new Type [] { type });
 934                 }
 935
 936                 public static ParametersCompiled CreateFullyResolved (Parameter[] parameters, Type[] types)
 937                 {
 938                         return new ParametersCompiled (parameters, types);
 939                 }
 940
 941                 public static ParametersCompiled MergeGenerated (ParametersCompiled userParams, bool checkConflicts, Parameter compilerParams, Type compilerTypes)
 942                 {
 943                         return MergeGenerated (userParams, checkConflicts,
 944                                 new Parameter [] { compilerParams },
 945                                 new Type [] { compilerTypes });
 946                 }
 947
 948                 //
 949                 // Use this method when you merge compiler generated parameters with user parameters
 950                 //
 951                 public static ParametersCompiled MergeGenerated (ParametersCompiled userParams, bool checkConflicts, Parameter[] compilerParams, Type[] compilerTypes)
 952                 {
 953                         Parameter[] all_params = new Parameter [userParams.Count + compilerParams.Length];
 954                         userParams.FixedParameters.CopyTo(all_params, 0);
 955
 956                         Type [] all_types;
 957                         if (userParams.types != null) {
 958                                 all_types = new Type [all_params.Length];
 959                                 userParams.Types.CopyTo (all_types, 0);
 960                         } else {
 961                                 all_types = null;
 962                         }
 963
 964                         int last_filled = userParams.Count;
 965                         int index = 0;
 966                         foreach (Parameter p in compilerParams) {
 967                                 for (int i = 0; i < last_filled; ++i) {
 968                                         while (p.Name == all_params [i].Name) {
 969                                                 if (checkConflicts && i < userParams.Count) {
 970                                                         Report.Error (316, userParams [i].Location,
 971                                                                 "The parameter name `{0}' conflicts with a compiler generated name", p.Name);
 972                                                 }
 973                                                 p.Name = '_' + p.Name;
 974                                         }
 975                                 }
 976                                 all_params [last_filled] = p;
 977                                 if (all_types != null)
 978                                         all_types [last_filled] = compilerTypes [index++];
 979                                 ++last_filled;
 980                         }
 981
 982                         ParametersCompiled parameters = new ParametersCompiled (all_params, all_types);
 983                         parameters.has_params = userParams.has_params;
 984                         return parameters;
 985                 }
 986
 987                 protected virtual void ErrorDuplicateName (Parameter p)
 988                 {
 989                         Report.Error (100, p.Location, "The parameter name `{0}' is a duplicate", p.Name);
 990                 }
 991
 992                 /// <summary>
 993                 ///    Returns the parameter information based on the name
 994                 /// </summary>
 995                 public int GetParameterIndexByName (string name)
 996                 {
 997                         for (int idx = 0; idx < Count; ++idx) {
 998                                 if (parameters [idx].Name == name)
 999                                         return idx;
1000                         }
1001
1002                         return -1;
1003                 }
1004
1005                 public bool Resolve (IResolveContext ec)
1006                 {
1007                         if (types != null)
1008                                 return true;
1009
1010                         types = new Type [Count];
1011
1012                         bool ok = true;
1013                         Parameter p;
1014                         for (int i = 0; i < FixedParameters.Length; ++i) {
1015                                 p = this [i];
1016                                 Type t = p.Resolve (ec);
1017                                 if (t == null) {
1018                                         ok = false;
1019                                         continue;
1020                                 }
1021
1022                                 types [i] = t;
1023                         }
1024
1025                         return ok;
1026                 }
1027
1028                 public void ResolveVariable ()
1029                 {
1030                         for (int i = 0; i < FixedParameters.Length; ++i) {
1031                                 this [i].ResolveVariable (i);
1032                         }
1033                 }
1034
1035                 public CallingConventions CallingConvention
1036                 {
1037                         get {
1038                                 if (HasArglist)
1039                                         return CallingConventions.VarArgs;
1040                                 else
1041                                         return CallingConventions.Standard;
1042                         }
1043                 }
1044
1045                 // Define each type attribute (in/out/ref) and
1046                 // the argument names.
1047                 public void ApplyAttributes (MethodBase builder)
1048                 {
1049                         if (Count == 0)
1050                                 return;
1051
1052                         MethodBuilder mb = builder as MethodBuilder;
1053                         ConstructorBuilder cb = builder as ConstructorBuilder;
1054
1055                         for (int i = 0; i < Count; i++) {
1056                                 this [i].ApplyAttributes (mb, cb, i + 1);
1057                         }
1058                 }
1059
1060                 public void VerifyClsCompliance ()
1061                 {
1062                         foreach (Parameter p in FixedParameters)
1063                                 p.IsClsCompliant ();
1064                 }
1065
1066                 public Parameter this [int pos] {
1067                         get { return (Parameter) parameters [pos]; }
1068                 }
1069
1070                 public Expression CreateExpressionTree (EmitContext ec, Location loc)
1071                 {
1072                         ArrayList initializers = new ArrayList (Count);
1073                         foreach (Parameter p in FixedParameters) {
1074                                 //
1075                                 // Each parameter expression is stored to local variable
1076                                 // to save some memory when referenced later.
1077                                 //
1078                                 StatementExpression se = new StatementExpression (p.CreateExpressionTreeVariable (ec));
1079                                 if (se.Resolve (ec))
1080                                         ec.CurrentBlock.AddScopeStatement (se);
1081
1082                                 initializers.Add (p.ExpressionTreeVariableReference ());
1083                         }
1084
1085                         return new ArrayCreation (
1086                                 Parameter.ResolveParameterExpressionType (ec, loc),
1087                                 "[]", initializers, loc);
1088                 }
1089
1090                 public ParametersCompiled Clone ()
1091                 {
1092                         ParametersCompiled p = (ParametersCompiled) MemberwiseClone ();
1093
1094                         p.parameters = new IParameterData [parameters.Length];
1095                         for (int i = 0; i < Count; ++i)
1096                                 p.parameters [i] = this [i].Clone ();
1097
1098                         return p;
1099                 }
1100         }
1101 }