mcs/mcs/anonymous.cs

   1 //
   2 // anonymous.cs: Support for anonymous methods
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximain.com)
   6 //
   7 // (C) 2003, 2004 Novell, Inc.
   8 //
   9 // TODO: Ideally, we should have the helper classes emited as a hierarchy to map
  10 // their nesting, and have the visibility set to private, instead of NestedAssembly
  11 //
  12 //
  13 //
  14
  15 using System;
  16 using System.Text;
  17 using System.Collections;
  18 using System.Reflection;
  19 using System.Reflection.Emit;
  20
  21 namespace Mono.CSharp {
  22
  23         public abstract class CompilerGeneratedClass : Class
  24         {
  25                 GenericMethod generic_method;
  26                 static int next_index = 0;
  27
  28                 private static MemberName MakeProxyName (GenericMethod generic, Location loc)
  29                 {
  30                         string name = String.Format ("<>c__CompilerGenerated{0}", ++next_index);
  31                         if (generic != null) {
  32                                 TypeArguments args = new TypeArguments (loc);
  33                                 foreach (TypeParameter tparam in generic.CurrentTypeParameters)
  34                                         args.Add (new SimpleName (tparam.Name, loc));
  35                                 return new MemberName (name, args, loc);
  36                         } else
  37                                 return new MemberName (name, loc);
  38                 }
  39
  40                 protected string MakeName (string prefix)
  41                 {
  42                         return String.Format ("<>c__{0}{1}", prefix, ++next_index);
  43                 }
  44
  45                 protected CompilerGeneratedClass (TypeContainer parent, GenericMethod generic,
  46                                                   int mod, Location loc)
  47                         : base (parent.NamespaceEntry, parent,
  48                                 MakeProxyName (generic, loc), mod, null)
  49                 {
  50                         this.generic_method = generic;
  51
  52                         if (generic != null) {
  53                                 ArrayList list = new ArrayList ();
  54                                 foreach (TypeParameter tparam in generic.TypeParameters) {
  55                                         if (tparam.Constraints != null)
  56                                                 list.Add (tparam.Constraints.Clone ());
  57                                 }
  58                                 SetParameterInfo (list);
  59                         }
  60
  61                         parent.AddCompilerGeneratedClass (this);
  62                 }
  63
  64                 protected override bool DefineNestedTypes ()
  65                 {
  66                         RootContext.RegisterCompilerGeneratedType (TypeBuilder);
  67                         return base.DefineNestedTypes ();
  68                 }
  69
  70                 protected override bool DoDefineMembers ()
  71                 {
  72                         members_defined = true;
  73
  74                         if (!base.DoDefineMembers ())
  75                                 return false;
  76
  77                         if (CompilerGenerated != null) {
  78                                 foreach (CompilerGeneratedClass c in CompilerGenerated) {
  79                                         if (!c.DefineMembers ())
  80                                                 throw new InternalErrorException ();
  81                                 }
  82                         }
  83
  84                         return true;
  85                 }
  86
  87                 protected override bool DoResolveMembers ()
  88                 {
  89                         if (CompilerGenerated != null) {
  90                                 foreach (CompilerGeneratedClass c in CompilerGenerated) {
  91                                         if (!c.ResolveMembers ())
  92                                                 return false;
  93                                 }
  94                         }
  95
  96                         return base.DoResolveMembers ();
  97                 }
  98
  99                 public GenericMethod GenericMethod {
 100                         get { return generic_method; }
 101                 }
 102
 103                 public TypeExpr InflateType (Type it)
 104                 {
 105 #if GMCS_SOURCE
 106                         if (generic_method == null)
 107                                 return new TypeExpression (it, Location);
 108
 109                         if (it.IsGenericParameter && (it.DeclaringMethod != null)) {
 110                                 int pos = it.GenericParameterPosition;
 111                                 it = CurrentTypeParameters [pos].Type;
 112                         } else if (it.IsGenericType) {
 113                                 Type[] args = it.GetGenericArguments ();
 114
 115                                 TypeArguments inflated = new TypeArguments (Location);
 116                                 foreach (Type t in args)
 117                                         inflated.Add (InflateType (t));
 118
 119                                 return new ConstructedType (it, inflated, Location);
 120                         } else if (it.IsArray) {
 121                                 TypeExpr et_expr = InflateType (it.GetElementType ());
 122                                 int rank = it.GetArrayRank ();
 123
 124                                 Type et = et_expr.ResolveAsTypeTerminal (this, false).Type;
 125                                 it = et.MakeArrayType (rank);
 126                         }
 127 #endif
 128
 129                         return new TypeExpression (it, Location);
 130                 }
 131
 132                 public Field CaptureVariable (string name, TypeExpr type)
 133                 {
 134                         if (members_defined)
 135                                 throw new InternalErrorException ("Helper class already defined!");
 136                         if (type == null)
 137                                 throw new ArgumentNullException ();
 138
 139                         return new CapturedVariableField (this, name, type);
 140                 }
 141
 142                 bool members_defined;
 143
 144                 internal void CheckMembersDefined ()
 145                 {
 146                         if (members_defined)
 147                                 throw new InternalErrorException ("Helper class already defined!");
 148                 }
 149
 150                 protected class CapturedVariableField : Field
 151                 {
 152                         public CapturedVariableField (CompilerGeneratedClass helper, string name,
 153                                                       TypeExpr type)
 154                                 : base (helper, type, Modifiers.INTERNAL, name, null, helper.Location)
 155                         {
 156                                 helper.AddField (this);
 157                         }
 158                 }
 159         }
 160
 161         public class ScopeInfo : CompilerGeneratedClass
 162         {
 163                 public readonly AnonymousMethodHost RootScope;
 164                 public readonly int ID = ++next_id;
 165                 public Block ScopeBlock;
 166
 167                 static int next_id;
 168
 169                 public ScopeInfo (AnonymousMethodHost root, Block block)
 170                         : base (root, null, Modifiers.PUBLIC, block.StartLocation)
 171                 {
 172                         this.RootScope = root;
 173                         ScopeBlock = block;
 174
 175                         Report.Debug (64, "NEW SCOPE", this, root, block);
 176
 177                         root.AddScope (this);
 178                 }
 179
 180                 public ScopeInfo (ToplevelBlock toplevel, TypeContainer parent,
 181                                   GenericMethod generic, Location loc)
 182                         : base (parent, generic, 0, loc)
 183                 {
 184                         RootScope = (AnonymousMethodHost) this;
 185                         ScopeBlock = toplevel;
 186
 187                         Report.Debug (64, "NEW ROOT SCOPE", this);
 188                 }
 189
 190                 protected CapturedScope scope_instance;
 191                 protected ScopeInitializer scope_initializer;
 192
 193                 Hashtable locals = new Hashtable ();
 194
 195                 public virtual AnonymousMethodHost Host {
 196                         get { return RootScope; }
 197                 }
 198
 199                 public Variable ScopeInstance {
 200                         get { return scope_instance; }
 201                 }
 202
 203                 public void EmitScopeInstance (EmitContext ec)
 204                 {
 205                         if (scope_initializer == null) {
 206                                 //
 207                                 // This is needed if someone overwrites the Emit method
 208                                 // of Statement and manually calls Block.Emit without
 209                                 // this snippet first:
 210                                 //
 211                                 //   ec.EmitScopeInitFromBlock (The_Block);
 212                                 //   The_Block.Emit (ec);
 213                                 //
 214                                 throw new InternalErrorException ();
 215                         }
 216
 217                         scope_initializer.Emit (ec);
 218                 }
 219
 220                 public ExpressionStatement GetScopeInitializer (EmitContext ec)
 221                 {
 222                         Report.Debug (64, "GET SCOPE INITIALIZER",
 223                                       this, GetType (), scope_initializer, ScopeBlock);
 224
 225                         if (scope_initializer == null) {
 226                                 scope_initializer = CreateScopeInitializer ();
 227                                 if (scope_initializer.Resolve (ec) == null)
 228                                         throw new InternalErrorException ();
 229                         }
 230
 231                         return scope_initializer;
 232                 }
 233
 234                 public Type GetScopeType (EmitContext ec)
 235                 {
 236                         if (!IsGeneric)
 237                                 return TypeBuilder;
 238
 239                         TypeArguments targs = new TypeArguments (Location);
 240
 241                         if (ec.DeclContainer.Parent.IsGeneric)
 242                                 foreach (TypeParameter t in ec.DeclContainer.Parent.TypeParameters)
 243                                         targs.Add (new TypeParameterExpr (t, Location));
 244                         if (ec.DeclContainer.IsGeneric)
 245                                 foreach (TypeParameter t in ec.DeclContainer.CurrentTypeParameters)
 246                                         targs.Add (new TypeParameterExpr (t, Location));
 247
 248                         TypeExpr te = new ConstructedType (TypeBuilder, targs, Location);
 249                         te = te.ResolveAsTypeTerminal (ec, false);
 250                         if ((te == null) || (te.Type == null))
 251                                 return null;
 252                         return te.Type;
 253                 }
 254
 255                 protected override bool DoResolveMembers ()
 256                 {
 257                         Report.Debug (64, "SCOPE INFO RESOLVE MEMBERS", this, GetType (), IsGeneric,
 258                                       Parent.IsGeneric, GenericMethod);
 259
 260                         if (Host != this)
 261                                 scope_instance = new CapturedScope (Host, this);
 262
 263                         return base.DoResolveMembers ();
 264                 }
 265
 266                 public Variable AddLocal (LocalInfo local)
 267                 {
 268                         Variable var = (Variable) locals [local];
 269                         if (var == null) {
 270                                 var = new CapturedLocal (this, local);
 271                                 locals.Add (local, var);
 272                                 local.IsCaptured = true;
 273                         }
 274                         return var;
 275                 }
 276
 277                 public Variable GetCapturedVariable (LocalInfo local)
 278                 {
 279                         return (Variable) locals [local];
 280                 }
 281
 282                 protected string MakeFieldName (string local_name)
 283                 {
 284                         return "<" + ID + ":" + local_name + ">";
 285                 }
 286
 287                 protected virtual ScopeInitializer CreateScopeInitializer ()
 288                 {
 289                         return new ScopeInitializer (this);
 290                 }
 291
 292                 protected abstract class CapturedVariable : Variable
 293                 {
 294                         public readonly ScopeInfo Scope;
 295                         public readonly Field Field;
 296
 297                         public FieldExpr FieldInstance;
 298
 299                         protected CapturedVariable (ScopeInfo scope, string name, Type type)
 300                         {
 301                                 this.Scope = scope;
 302                                 this.Field = scope.CaptureVariable (
 303                                         scope.MakeFieldName (name), scope.RootScope.InflateType (type));
 304                         }
 305
 306                         public override Type Type {
 307                                 get { return Field.MemberType; }
 308                         }
 309
 310                         public override bool HasInstance {
 311                                 get { return true; }
 312                         }
 313
 314                         public override bool NeedsTemporary {
 315                                 get { return true; }
 316                         }
 317
 318                         protected FieldInfo GetField (EmitContext ec)
 319                         {
 320                                 if (ec.CurrentBlock.Toplevel != Scope.ScopeBlock.Toplevel)
 321                                         return Field.FieldBuilder;
 322                                 else
 323                                         return FieldInstance.FieldInfo;
 324                         }
 325
 326                         public override void EmitInstance (EmitContext ec)
 327                         {
 328                                 ec.CurrentBlock.Toplevel.EmitScopeInstance (ec, Scope);
 329                         }
 330
 331                         public override void Emit (EmitContext ec)
 332                         {
 333                                 ec.ig.Emit (OpCodes.Ldfld, GetField (ec));
 334                         }
 335
 336                         public override void EmitAssign (EmitContext ec)
 337                         {
 338                                 ec.ig.Emit (OpCodes.Stfld, GetField (ec));
 339                         }
 340
 341                         public override void EmitAddressOf (EmitContext ec)
 342                         {
 343                                 ec.ig.Emit (OpCodes.Ldflda, GetField (ec));
 344                         }
 345                 }
 346
 347                 protected class CapturedParameter : CapturedVariable {
 348                         public readonly Parameter Parameter;
 349                         public readonly int Idx;
 350
 351                         public CapturedParameter (ScopeInfo scope, Parameter par, int idx)
 352                                 : base (scope, par.Name, par.ParameterType)
 353                         {
 354                                 this.Parameter = par;
 355                                 this.Idx = idx;
 356                         }
 357
 358                         public override string ToString ()
 359                         {
 360                                 return String.Format ("{0} ({1}:{2}:{3})", GetType (), Field,
 361                                                       Parameter.Name, Idx);
 362                         }
 363                 }
 364
 365                 protected class CapturedLocal : CapturedVariable {
 366                         public readonly LocalInfo Local;
 367
 368                         public CapturedLocal (ScopeInfo scope, LocalInfo local)
 369                                 : base (scope, local.Name, local.VariableType)
 370                         {
 371                                 this.Local = local;
 372                         }
 373
 374                         public override string ToString ()
 375                         {
 376                                 return String.Format ("{0} ({1}:{2})", GetType (), Field,
 377                                                       Local.Name);
 378                         }
 379                 }
 380
 381                 protected class CapturedThis : CapturedVariable {
 382                         public CapturedThis (AnonymousMethodHost host)
 383                                 : base (host, "<>THIS", host.ParentType)
 384                         { }
 385                 }
 386
 387                 protected class CapturedScope : CapturedVariable {
 388                         public readonly ScopeInfo ChildScope;
 389
 390                         public CapturedScope (ScopeInfo root, ScopeInfo child)
 391                                 : base (root, child.ID + "_scope", child.TypeBuilder)
 392                         {
 393                                 this.ChildScope = child;
 394                         }
 395                 }
 396
 397                 static void DoPath (StringBuilder sb, ScopeInfo start)
 398                 {
 399                         sb.Append ((start.ID).ToString ());
 400                 }
 401
 402                 public override string ToString ()
 403                 {
 404                         StringBuilder sb = new StringBuilder ();
 405
 406                         sb.Append ("{");
 407                         DoPath (sb, this);
 408                         sb.Append ("}");
 409
 410                         return sb.ToString ();
 411                 }
 412
 413                 protected class ScopeInitializer : ExpressionStatement
 414                 {
 415                         ScopeInfo scope;
 416                         LocalBuilder scope_instance;
 417                         ConstructorInfo scope_ctor;
 418
 419                         bool initialized;
 420
 421                         public ScopeInitializer (ScopeInfo scope)
 422                         {
 423                                 this.scope = scope;
 424                                 this.loc = scope.Location;
 425                                 eclass = ExprClass.Value;
 426                         }
 427
 428                         public ScopeInfo Scope {
 429                                 get { return scope; }
 430                         }
 431
 432                         public override Expression DoResolve (EmitContext ec)
 433                         {
 434                                 if (scope_ctor != null)
 435                                         return this;
 436
 437                                 Report.Debug (64, "RESOLVE SCOPE INITIALIZER BASE", this, Scope,
 438                                               ec, ec.CurrentBlock);
 439
 440                                 type = Scope.GetScopeType (ec);
 441                                 if (type == null)
 442                                         throw new InternalErrorException ();
 443
 444                                 if (!DoResolveInternal (ec))
 445                                         throw new InternalErrorException ();
 446
 447                                 return this;
 448                         }
 449
 450                         protected virtual bool DoResolveInternal (EmitContext ec)
 451                         {
 452                                 MethodGroupExpr mg = (MethodGroupExpr) Expression.MemberLookupFinal (
 453                                         ec, ec.ContainerType, type, ".ctor", MemberTypes.Constructor,
 454                                         AllBindingFlags | BindingFlags.DeclaredOnly, loc);
 455                                 if (mg == null)
 456                                         throw new InternalErrorException ();
 457
 458                                 scope_ctor = (ConstructorInfo) mg.Methods [0];
 459
 460                                 if (Scope.ScopeInstance == null)
 461                                         scope_instance = ec.ig.DeclareLocal (type);
 462                                 else {
 463                                         Type root = Scope.Host.GetScopeType (ec);
 464                                         FieldExpr fe = (FieldExpr) Expression.MemberLookup (
 465                                                 type, root, Scope.scope_instance.Field.Name, loc);
 466                                         if (fe == null)
 467                                                 throw new InternalErrorException ();
 468
 469                                         fe.InstanceExpression = this;
 470                                         Scope.scope_instance.FieldInstance = fe;
 471                                 }
 472
 473                                 foreach (CapturedLocal local in Scope.locals.Values) {
 474                                         FieldExpr fe = (FieldExpr) Expression.MemberLookup (
 475                                                 ec.ContainerType, type, local.Field.Name, loc);
 476                                         Report.Debug (64, "RESOLVE SCOPE INITIALIZER #2", this, Scope,
 477                                                       Scope, ec, ec.ContainerType, type,
 478                                                       local.Field, local.Field.Name, loc, fe);
 479                                         if (fe == null)
 480                                                 throw new InternalErrorException ();
 481
 482                                         fe.InstanceExpression = this;
 483                                         local.FieldInstance = fe;
 484                                 }
 485
 486                                 return true;
 487                         }
 488
 489                         protected virtual void EmitParameterReference (EmitContext ec,
 490                                                                        CapturedParameter cp)
 491                         {
 492                                 int extra = ec.IsStatic ? 0 : 1;
 493                                 ParameterReference.EmitLdArg (ec.ig, cp.Idx + extra);
 494                         }
 495
 496                         static int next_id;
 497                         int id = ++next_id;
 498
 499                         protected virtual void DoEmit (EmitContext ec)
 500                         {
 501                                 if (ec.CurrentBlock.Toplevel == Scope.ScopeBlock.Toplevel)
 502                                         DoEmitInstance (ec);
 503                                 else
 504                                         ec.ig.Emit (OpCodes.Ldarg_0);
 505                         }
 506
 507                         protected void DoEmitInstance (EmitContext ec)
 508                         {
 509                                 ec.ig.Emit (OpCodes.Ldloc, scope_instance);
 510                         }
 511
 512                         protected virtual void EmitScopeConstructor (EmitContext ec)
 513                         {
 514                                 ec.ig.Emit (OpCodes.Newobj, scope_ctor);
 515                         }
 516
 517                         public override void Emit (EmitContext ec)
 518                         {
 519                                 if (!initialized)
 520                                         throw new InternalErrorException (
 521                                                 "Scope {0} not initialized yet", scope);
 522
 523                                 DoEmit (ec);
 524                         }
 525
 526                         public override void EmitStatement (EmitContext ec)
 527                         {
 528                                 if (initialized)
 529                                         return;
 530
 531                                 DoEmitStatement (ec);
 532                                 initialized = true;
 533                         }
 534
 535                         protected virtual void DoEmitStatement (EmitContext ec)
 536                         {
 537                                 Report.Debug (64, "EMIT SCOPE INIT", this, id,
 538                                               Scope, scope_instance, ec);
 539
 540                                 ec.ig.Emit (OpCodes.Nop);
 541                                 ec.ig.Emit (OpCodes.Ldc_I4, id);
 542                                 ec.ig.Emit (OpCodes.Pop);
 543                                 ec.ig.Emit (OpCodes.Nop);
 544
 545                                 if (Scope != Scope.Host)
 546                                         Scope.Host.EmitScopeInstance (ec);
 547                                 else if (Scope.ScopeInstance != null)
 548                                         ec.ig.Emit (OpCodes.Ldarg_0);
 549                                 EmitScopeConstructor (ec);
 550                                 if (Scope.ScopeInstance != null)
 551                                         Scope.ScopeInstance.EmitAssign (ec);
 552                                 else
 553                                         ec.ig.Emit (OpCodes.Stloc, scope_instance);
 554                         }
 555                 }
 556         }
 557
 558         public class AnonymousMethodHost : ScopeInfo
 559         {
 560                 public AnonymousMethodHost (ToplevelBlock toplevel, TypeContainer parent,
 561                                             GenericMethod generic, Location loc)
 562                         : base (toplevel, parent, generic, loc)
 563                 {
 564                         scopes = new ArrayList ();
 565                 }
 566
 567                 ArrayList scopes;
 568                 TypeExpr parent_type;
 569                 CapturedVariableField parent_link;
 570                 CapturedThis this_variable;
 571                 Hashtable captured_params;
 572
 573                 public override AnonymousMethodHost Host {
 574                         get { return this; }
 575                 }
 576
 577                 public virtual bool IsIterator {
 578                         get { return false; }
 579                 }
 580
 581                 public AnonymousMethodHost ParentHost {
 582                         get { return Parent as AnonymousMethodHost; }
 583                 }
 584
 585                 public Type ParentType {
 586                         get { return parent_type.Type; }
 587                 }
 588
 589                 public Field ParentLink {
 590                         get { return parent_link; }
 591                 }
 592
 593                 protected CapturedThis THIS {
 594                         get { return this_variable; }
 595                 }
 596
 597                 public bool HostsParameters {
 598                         get { return captured_params != null; }
 599                 }
 600
 601                 public Variable CaptureThis ()
 602                 {
 603                         if (ParentHost != null)
 604                                 return ParentHost.CaptureThis ();
 605
 606                         CheckMembersDefined ();
 607                         if (this_variable == null)
 608                                 this_variable = new CapturedThis (this);
 609                         return this_variable;
 610                 }
 611
 612                 public Variable GetCapturedParameter (Parameter par)
 613                 {
 614                         if (captured_params != null)
 615                                 return (Variable) captured_params [par];
 616                         else
 617                                 return null;
 618                 }
 619
 620                 public bool IsParameterCaptured (string name)
 621                 {
 622                         if (captured_params != null)
 623                                 return captured_params [name] != null;
 624                         return false;
 625                 }
 626
 627                 public Variable AddParameter (Parameter par, int idx)
 628                 {
 629                         if (captured_params == null)
 630                                 captured_params = new Hashtable ();
 631
 632                         Variable var = (Variable) captured_params [par];
 633                         if (var == null) {
 634                                 var = new CapturedParameter (this, par, idx);
 635                                 captured_params.Add (par, var);
 636                                 par.IsCaptured = true;
 637                         }
 638
 639                         return var;
 640                 }
 641
 642                 public void AddScope (ScopeInfo scope)
 643                 {
 644                         scopes.Add (scope);
 645                 }
 646
 647                 bool linked;
 648                 public void LinkScopes ()
 649                 {
 650                         if (linked)
 651                                 return;
 652
 653                         linked = true;
 654                         if (ParentHost != null)
 655                                 ParentHost.LinkScopes ();
 656
 657                         foreach (ScopeInfo si in scopes) {
 658                                 if (!si.Define ())
 659                                         throw new InternalErrorException ();
 660                                 if (si.DefineType () == null)
 661                                         throw new InternalErrorException ();
 662                         }
 663                 }
 664
 665                 protected override ScopeInitializer CreateScopeInitializer ()
 666                 {
 667                         return new AnonymousMethodHostInitializer (this);
 668                 }
 669
 670                 protected override bool DefineNestedTypes ()
 671                 {
 672                         if (Parent.IsGeneric) {
 673                                 parent_type = new ConstructedType (
 674                                         Parent.TypeBuilder, Parent.TypeParameters, Location);
 675                                 parent_type = parent_type.ResolveAsTypeTerminal (this, false);
 676                                 if ((parent_type == null) || (parent_type.Type == null))
 677                                         return false;
 678                         } else {
 679                                 parent_type = new TypeExpression (Parent.TypeBuilder, Location);
 680                         }
 681
 682                         CompilerGeneratedClass parent = Parent as CompilerGeneratedClass;
 683                         if (parent != null)
 684                                 parent_link = new CapturedVariableField (this, "<>parent", parent_type);
 685
 686                         return base.DefineNestedTypes ();
 687                 }
 688
 689                 protected override bool DoDefineMembers ()
 690                 {
 691                         ArrayList args = new ArrayList ();
 692                         if (this is IteratorHost)
 693                                 args.Add (new Parameter (
 694                                         TypeManager.int32_type, "$PC", Parameter.Modifier.NONE,
 695                                         null, Location));
 696
 697                         Field pfield;
 698                         if (Parent is CompilerGeneratedClass)
 699                                 pfield = parent_link;
 700                         else
 701                                 pfield = this_variable !=  null ? this_variable.Field : null;
 702                         if (pfield != null)
 703                                 args.Add (new Parameter (
 704                                         pfield.MemberType, "parent", Parameter.Modifier.NONE,
 705                                         null, Location));
 706
 707                         if (HostsParameters) {
 708                                 foreach (CapturedParameter cp in captured_params.Values) {
 709                                         args.Add (new Parameter (
 710                                                           cp.Field.MemberType, cp.Field.Name,
 711                                                           Parameter.Modifier.NONE, null, Location));
 712                                 }
 713                         }
 714
 715                         Parameter[] ctor_params = new Parameter [args.Count];
 716                         args.CopyTo (ctor_params, 0);
 717                         Constructor ctor = new Constructor (
 718                                 this, MemberName.Name, Modifiers.PUBLIC,
 719                                 new Parameters (ctor_params),
 720                                 new GeneratedBaseInitializer (Location),
 721                                 Location);
 722                         AddConstructor (ctor);
 723
 724                         ctor.Block = new ToplevelBlock (null, Location);
 725                         ctor.Block.AddStatement (new TheCtor (this));
 726
 727                         return base.DoDefineMembers ();
 728                 }
 729
 730                 protected virtual void EmitScopeConstructor (EmitContext ec)
 731                 {
 732                         int pos = (this is IteratorHost) ? 2 : 1;
 733
 734                         Field pfield;
 735                         if (Parent is CompilerGeneratedClass)
 736                                 pfield = parent_link;
 737                         else
 738                                 pfield = this_variable !=  null ? this_variable.Field : null;
 739
 740                         if (pfield != null) {
 741                                 ec.ig.Emit (OpCodes.Ldarg_0);
 742                                 ec.ig.Emit (OpCodes.Ldarg, pos);
 743                                 ec.ig.Emit (OpCodes.Stfld, pfield.FieldBuilder);
 744                                 pos++;
 745                         }
 746
 747                         if (HostsParameters) {
 748                                 foreach (CapturedParameter cp in captured_params.Values) {
 749                                         ec.ig.Emit (OpCodes.Ldarg_0);
 750                                         ParameterReference.EmitLdArg (ec.ig, pos++);
 751                                         ec.ig.Emit (OpCodes.Stfld, cp.Field.FieldBuilder);
 752                                 }
 753                         }
 754                 }
 755
 756                 protected class TheCtor : Statement
 757                 {
 758                         AnonymousMethodHost host;
 759
 760                         public TheCtor (AnonymousMethodHost host)
 761                         {
 762                                 this.host = host;
 763                         }
 764
 765                         public override bool Resolve (EmitContext ec)
 766                         {
 767                                 return true;
 768                         }
 769
 770                         protected override void DoEmit (EmitContext ec)
 771                         {
 772                                 host.EmitScopeConstructor (ec);
 773                         }
 774                 }
 775
 776                 protected class AnonymousMethodHostInitializer : ScopeInitializer
 777                 {
 778                         AnonymousMethodHost host;
 779
 780                         public AnonymousMethodHostInitializer (AnonymousMethodHost host)
 781                                 : base (host)
 782                         {
 783                                 this.host = host;
 784                         }
 785
 786                         public AnonymousMethodHost Host {
 787                                 get { return host; }
 788                         }
 789
 790                         protected override bool DoResolveInternal (EmitContext ec)
 791                         {
 792                                 Report.Debug (64, "RESOLVE ANONYMOUS METHOD HOST INITIALIZER",
 793                                               this, Host, Host.ParentType, loc);
 794
 795                                 if (Host.THIS != null) {
 796                                         FieldExpr fe = (FieldExpr) Expression.MemberLookup (
 797                                                 ec.ContainerType, type, Host.THIS.Field.Name, loc);
 798                                         if (fe == null)
 799                                                 throw new InternalErrorException ();
 800
 801                                         fe.InstanceExpression = this;
 802                                         Host.THIS.FieldInstance = fe;
 803                                 }
 804
 805                                 //
 806                                 // Copy the parameter values, if any
 807                                 //
 808                                 if (Host.HostsParameters) {
 809                                         foreach (CapturedParameter cp in Host.captured_params.Values) {
 810                                                 FieldExpr fe = (FieldExpr) Expression.MemberLookup (
 811                                                         ec.ContainerType, type, cp.Field.Name, loc);
 812                                                 if (fe == null)
 813                                                         throw new InternalErrorException ();
 814
 815                                                 fe.InstanceExpression = this;
 816                                                 cp.FieldInstance = fe;
 817                                         }
 818                                 }
 819
 820                                 return base.DoResolveInternal (ec);
 821                         }
 822
 823                         protected virtual bool IsGetEnumerator {
 824                                 get { return false; }
 825                         }
 826
 827                         protected override void EmitScopeConstructor (EmitContext ec)
 828                         {
 829                                 if (host.THIS != null) {
 830                                         ec.ig.Emit (OpCodes.Ldarg_0);
 831                                         if (IsGetEnumerator)
 832                                                 ec.ig.Emit (OpCodes.Ldfld, host.THIS.Field.FieldBuilder);
 833                                         else if (host.THIS.Type.IsValueType)
 834                                                 Expression.LoadFromPtr (ec.ig, host.THIS.Type);
 835                                 } else if (host.ParentLink != null)
 836                                         ec.ig.Emit (OpCodes.Ldarg_0);
 837
 838                                 if (Host.HostsParameters) {
 839                                         foreach (CapturedParameter cp in Host.captured_params.Values) {
 840                                                 EmitParameterReference (ec, cp);
 841                                         }
 842                                 }
 843
 844                                 base.EmitScopeConstructor (ec);
 845                         }
 846                 }
 847
 848         }
 849
 850         public interface IAnonymousContainer
 851         {
 852                 Block Container {
 853                         get;
 854                 }
 855
 856                 GenericMethod GenericMethod {
 857                         get;
 858                 }
 859
 860                 AnonymousMethodHost RootScope {
 861                         get;
 862                 }
 863
 864                 bool IsIterator {
 865                         get;
 866                 }
 867         }
 868
 869         public interface IAnonymousHost
 870         {
 871                 //
 872                 // Invoked if a yield statement is found in the body
 873                 //
 874                 void SetYields ();
 875
 876                 //
 877                 // Invoked if an anonymous method is found in the body
 878                 //
 879                 void AddAnonymousMethod (AnonymousMethodExpression anonymous);
 880         }
 881
 882         public class AnonymousMethodExpression : Expression, IAnonymousContainer, IAnonymousHost
 883         {
 884                 public readonly AnonymousMethodExpression Parent;
 885                 public readonly TypeContainer Host;
 886                 public readonly Parameters Parameters;
 887
 888                 public ToplevelBlock Block;
 889                 protected AnonymousMethod anonymous;
 890
 891                 protected readonly Block container;
 892                 protected readonly GenericMethod generic;
 893
 894                 public Block Container {
 895                         get { return container; }
 896                 }
 897
 898                 public GenericMethod GenericMethod {
 899                         get { return generic; }
 900                 }
 901
 902                 public AnonymousMethod AnonymousMethod {
 903                         get { return anonymous; }
 904                 }
 905
 906                 public AnonymousMethodHost RootScope {
 907                         get { return root_scope; }
 908                 }
 909
 910                 public AnonymousMethodExpression (AnonymousMethodExpression parent,
 911                                                   GenericMethod generic, TypeContainer host,
 912                                                   Parameters parameters, Block container,
 913                                                   Location loc)
 914                 {
 915                         this.Parent = parent;
 916                         this.generic = parent != null ? null : generic;
 917                         this.Host = host;
 918                         this.Parameters = parameters;
 919                         this.container = container;
 920                         this.loc = loc;
 921
 922                         Report.Debug (64, "NEW ANONYMOUS METHOD EXPRESSION", this, parent, host,
 923                                       container, loc);
 924
 925                         if (parent != null)
 926                                 parent.AddAnonymousMethod (this);
 927                 }
 928
 929                 ArrayList children;
 930                 AnonymousMethodHost root_scope;
 931
 932                 static int next_index;
 933
 934                 void IAnonymousHost.SetYields ()
 935                 {
 936                         throw new InvalidOperationException ();
 937                 }
 938
 939                 public void AddAnonymousMethod (AnonymousMethodExpression anonymous)
 940                 {
 941                         if (children == null)
 942                                 children = new ArrayList ();
 943                         children.Add (anonymous);
 944                 }
 945
 946                 public bool CreateAnonymousHelpers ()
 947                 {
 948                         Report.Debug (64, "ANONYMOUS METHOD EXPRESSION CREATE ROOT SCOPE",
 949                                       this, Host, container, loc);
 950
 951                         if (container != null)
 952                                 root_scope = container.Toplevel.CreateAnonymousMethodHost (Host);
 953
 954                         if (children != null) {
 955                                 foreach (AnonymousMethodExpression child in children) {
 956                                         if (!child.CreateAnonymousHelpers ())
 957                                                 return false;
 958                                 }
 959                         }
 960
 961                         return true;
 962                 }
 963
 964                 public override string ExprClassName {
 965                         get {
 966                                 return "anonymous method";
 967                         }
 968                 }
 969
 970                 void Error_ParameterMismatch (Type t)
 971                 {
 972                         Report.Error (1661, loc, "Anonymous method could not be converted to delegate `" +
 973                                       "{0}' since there is a parameter mismatch",
 974                                       TypeManager.CSharpName (t));
 975                 }
 976
 977                 public bool ImplicitStandardConversionExists (Type delegate_type)
 978                 {
 979                         if (Parameters == null)
 980                                 return true;
 981
 982                         MethodGroupExpr invoke_mg = Delegate.GetInvokeMethod (
 983                                 Host.TypeBuilder, delegate_type, loc);
 984                         MethodInfo invoke_mb = (MethodInfo) invoke_mg.Methods [0];
 985                         ParameterData invoke_pd = TypeManager.GetParameterData (invoke_mb);
 986
 987                         if (Parameters.Count != invoke_pd.Count)
 988                                 return false;
 989
 990                         for (int i = 0; i < Parameters.Count; ++i) {
 991                                 if (invoke_pd.ParameterType (i) != Parameters.ParameterType (i))
 992                                         return false;
 993                         }
 994                         return true;
 995                 }
 996
 997                 //
 998                 // Returns true if this anonymous method can be implicitly
 999                 // converted to the delegate type `delegate_type'
1000                 //
1001                 public Expression Compatible (EmitContext ec, Type delegate_type)
1002                 {
1003                         if (anonymous != null)
1004                                 return anonymous.AnonymousDelegate;
1005
1006                         if (!ec.IsAnonymousMethodAllowed) {
1007                                 Report.Error (1706, loc,
1008                                               "Anonymous methods are not allowed in the " +
1009                                               "attribute declaration");
1010                                 return null;
1011                         }
1012
1013                         if (!TypeManager.IsDelegateType (delegate_type)){
1014                                 Report.Error (1660, loc,
1015                                               "Cannot convert anonymous method block to type " +
1016                                               "`{0}' because it is not a delegate type",
1017                                               TypeManager.CSharpName (delegate_type));
1018                                 return null;
1019                         }
1020
1021                         //
1022                         // At this point its the first time we know the return type that is
1023                         // needed for the anonymous method.  We create the method here.
1024                         //
1025
1026                         MethodGroupExpr invoke_mg = Delegate.GetInvokeMethod (
1027                                 ec.ContainerType, delegate_type, loc);
1028                         MethodInfo invoke_mb = (MethodInfo) invoke_mg.Methods [0];
1029                         ParameterData invoke_pd = TypeManager.GetParameterData (invoke_mb);
1030
1031                         Parameters parameters;
1032                         if (Parameters == null) {
1033                                 //
1034                                 // We provide a set of inaccessible parameters
1035                                 //
1036                                 Parameter [] fixedpars = new Parameter [invoke_pd.Count];
1037
1038                                 for (int i = 0; i < invoke_pd.Count; i++) {
1039                                         Parameter.Modifier i_mod = invoke_pd.ParameterModifier (i);
1040                                         if ((i_mod & Parameter.Modifier.OUTMASK) != 0) {
1041                                                 Report.Error (1688, loc, "Cannot convert anonymous " +
1042                                                               "method block without a parameter list " +
1043                                                               "to delegate type `{0}' because it has " +
1044                                                               "one or more `out' parameters.",
1045                                                               TypeManager.CSharpName (delegate_type));
1046                                                 return null;
1047                                         }
1048                                         fixedpars [i] = new Parameter (
1049                                                 invoke_pd.ParameterType (i), "+" + (++next_index),
1050                                                 invoke_pd.ParameterModifier (i), null, loc);
1051                                 }
1052
1053                                 parameters = new Parameters (fixedpars);
1054                                 if (!parameters.Resolve (ec))
1055                                         return null;
1056                         } else {
1057                                 if (Parameters.Count != invoke_pd.Count) {
1058                                         Report.SymbolRelatedToPreviousError (delegate_type);
1059                                         Report.Error (1593, loc, "Delegate `{0}' does not take `{1}' arguments",
1060                                                 TypeManager.CSharpName (delegate_type), Parameters.Count.ToString ());
1061                                         Error_ParameterMismatch (delegate_type);
1062                                         return null;
1063                                 }
1064
1065                                 for (int i = 0; i < Parameters.Count; ++i) {
1066                                         Parameter.Modifier p_mod = invoke_pd.ParameterModifier (i);
1067                                         if (Parameters.ParameterModifier (i) != p_mod && p_mod != Parameter.Modifier.PARAMS) {
1068                                                 if (p_mod == Parameter.Modifier.NONE)
1069                                                         Report.Error (1677, loc, "Parameter `{0}' should not be declared with the `{1}' keyword",
1070                                                                 (i + 1).ToString (), Parameter.GetModifierSignature (Parameters.ParameterModifier (i)));
1071                                                 else
1072                                                         Report.Error (1676, loc, "Parameter `{0}' must be declared with the `{1}' keyword",
1073                                                                 (i+1).ToString (), Parameter.GetModifierSignature (p_mod));
1074                                                 Error_ParameterMismatch (delegate_type);
1075                                                 return null;
1076                                         }
1077
1078                                         if (invoke_pd.ParameterType (i) != Parameters.ParameterType (i)) {
1079                                                 Report.Error (1678, loc, "Parameter `{0}' is declared as type `{1}' but should be `{2}'",
1080                                                         (i+1).ToString (),
1081                                                         TypeManager.CSharpName (Parameters.ParameterType (i)),
1082                                                         TypeManager.CSharpName (invoke_pd.ParameterType (i)));
1083                                                 Error_ParameterMismatch (delegate_type);
1084                                                 return null;
1085                                         }
1086                                 }
1087
1088                                 parameters = Parameters;
1089                         }
1090
1091                         //
1092                         // Second: the return type of the delegate must be compatible with
1093                         // the anonymous type.   Instead of doing a pass to examine the block
1094                         // we satisfy the rule by setting the return type on the EmitContext
1095                         // to be the delegate type return type.
1096                         //
1097
1098                         //MethodBuilder builder = method_data.MethodBuilder;
1099                         //ILGenerator ig = builder.GetILGenerator ();
1100
1101                         Report.Debug (64, "COMPATIBLE", this, Parent, GenericMethod, Host,
1102                                       Container, Block, invoke_mb.ReturnType, delegate_type,
1103                                       TypeManager.IsGenericType (delegate_type), loc);
1104
1105                         anonymous = new AnonymousMethod (
1106                                 Parent != null ? Parent.AnonymousMethod : null, RootScope, Host,
1107                                 GenericMethod, parameters, Container, Block, invoke_mb.ReturnType,
1108                                 delegate_type, loc);
1109
1110                         if (!anonymous.Resolve (ec))
1111                                 return null;
1112
1113                         return anonymous.AnonymousDelegate;
1114                 }
1115
1116                 public override Expression DoResolve (EmitContext ec)
1117                 {
1118                         //
1119                         // Set class type, set type
1120                         //
1121
1122                         eclass = ExprClass.Value;
1123
1124                         //
1125                         // This hack means `The type is not accessible
1126                         // anywhere', we depend on special conversion
1127                         // rules.
1128                         //
1129                         type = TypeManager.anonymous_method_type;
1130
1131                         if ((Parameters != null) && !Parameters.Resolve (ec))
1132                                 return null;
1133
1134                         return this;
1135                 }
1136
1137                 public override void Emit (EmitContext ec)
1138                 {
1139                         // nothing, as we only exist to not do anything.
1140                 }
1141
1142                 public bool IsIterator {
1143                         get { return false; }
1144                 }
1145         }
1146
1147         public abstract class AnonymousContainer : IAnonymousContainer
1148         {
1149                 // Used to generate unique method names.
1150                 protected static int anonymous_method_count;
1151
1152                 public readonly Location Location;
1153
1154                 // An array list of AnonymousMethodParameter or null
1155                 public readonly Parameters Parameters;
1156
1157                 //
1158                 // The block that makes up the body for the anonymous mehtod
1159                 //
1160                 public readonly ToplevelBlock Block;
1161
1162                 public readonly int ModFlags;
1163                 public readonly Type ReturnType;
1164                 public readonly TypeContainer Host;
1165
1166                 //
1167                 // The implicit method we create
1168                 //
1169                 protected Method method;
1170                 protected EmitContext aec;
1171
1172                 // The emit context for the anonymous method
1173                 protected bool unreachable;
1174                 protected readonly Block container;
1175                 protected readonly GenericMethod generic;
1176
1177                 //
1178                 // Points to our container anonymous method if its present
1179                 //
1180                 public readonly AnonymousContainer ContainerAnonymousMethod;
1181
1182                 protected AnonymousContainer (AnonymousContainer parent, TypeContainer host,
1183                                               GenericMethod generic, Parameters parameters,
1184                                               Block container, ToplevelBlock block,
1185                                               Type return_type, int mod, Location loc)
1186                 {
1187                         this.ContainerAnonymousMethod = parent;
1188                         this.ReturnType = return_type;
1189                         this.ModFlags = mod;
1190                         this.Host = host;
1191
1192                         this.container = container;
1193                         this.generic = parent != null ? null : generic;
1194                         this.Parameters = parameters;
1195                         this.Block = block;
1196                         this.Location = loc;
1197                 }
1198
1199                 public Method Method {
1200                         get { return method; }
1201                 }
1202
1203                 public abstract AnonymousMethodHost RootScope {
1204                         get;
1205                 }
1206
1207                 public abstract string GetSignatureForError ();
1208
1209                 public virtual bool Resolve (EmitContext ec)
1210                 {
1211                         Report.Debug (64, "RESOLVE ANONYMOUS METHOD", this, Location, ec,
1212                                       RootScope, Parameters, ec.IsStatic);
1213
1214                         aec = new EmitContext (
1215                                 ec.ResolveContext, ec.TypeContainer,
1216                                 RootScope != null ? RootScope : Host, Location, null, ReturnType,
1217                                 /* REVIEW */ (ec.InIterator ? Modifiers.METHOD_YIELDS : 0) |
1218                                 (ec.InUnsafe ? Modifiers.UNSAFE : 0), /* No constructor */ false);
1219
1220                         aec.CurrentAnonymousMethod = this;
1221                         aec.IsFieldInitializer = ec.IsFieldInitializer;
1222
1223                         Report.Debug (64, "RESOLVE ANONYMOUS METHOD #1", this, Location, ec, aec,
1224                                       RootScope, Parameters, Block);
1225
1226                         bool unreachable;
1227                         if (!aec.ResolveTopBlock (ec, Block, Parameters, null, out unreachable))
1228                                 return false;
1229
1230                         Report.Debug (64, "RESOLVE ANONYMOUS METHOD #3", this, ec, aec, Block);
1231
1232                         method = DoCreateMethodHost (ec);
1233
1234                         if (RootScope != null)
1235                                 return true;
1236
1237                         if (!method.ResolveMembers ())
1238                                 return false;
1239                         return method.Define ();
1240                 }
1241
1242                 protected abstract Method DoCreateMethodHost (EmitContext ec);
1243
1244                 public Block Container {
1245                         get { return container; }
1246                 }
1247
1248                 public GenericMethod GenericMethod {
1249                         get { return generic; }
1250                 }
1251
1252                 public abstract bool IsIterator {
1253                         get;
1254                 }
1255
1256                 protected class AnonymousMethodMethod : Method
1257                 {
1258                         public AnonymousContainer AnonymousMethod;
1259
1260                         public AnonymousMethodMethod (AnonymousContainer am, GenericMethod generic,
1261                                                       TypeExpr return_type, int mod, MemberName name,
1262                                                       Parameters parameters)
1263                                 : base (am.RootScope != null ? am.RootScope : am.Host,
1264                                         generic, return_type, mod, false, name, parameters, null)
1265                         {
1266                                 this.AnonymousMethod = am;
1267
1268                                 if (am.RootScope != null) {
1269                                         am.RootScope.CheckMembersDefined ();
1270                                         am.RootScope.AddMethod (this);
1271                                 } else {
1272                                         ModFlags |= Modifiers.STATIC;
1273                                         am.Host.AddMethod (this);
1274                                 }
1275                                 Block = am.Block;
1276                         }
1277
1278                         public override EmitContext CreateEmitContext (DeclSpace tc, ILGenerator ig)
1279                         {
1280                                 EmitContext aec = AnonymousMethod.aec;
1281                                 aec.ig = ig;
1282                                 return aec;
1283                         }
1284                 }
1285         }
1286
1287         public class AnonymousMethod : AnonymousContainer
1288         {
1289                 public readonly Type DelegateType;
1290
1291                 //
1292                 // The value return by the Compatible call, this ensure that
1293                 // the code works even if invoked more than once (Resolve called
1294                 // more than once, due to the way Convert.ImplicitConversion works
1295                 //
1296                 Expression anonymous_delegate;
1297                 AnonymousMethodHost root_scope;
1298
1299                 public AnonymousMethod (AnonymousMethod parent, AnonymousMethodHost root_scope,
1300                                         TypeContainer host, GenericMethod generic,
1301                                         Parameters parameters, Block container,
1302                                         ToplevelBlock block, Type return_type, Type delegate_type,
1303                                         Location loc)
1304                         : base (parent, host, generic, parameters, container, block,
1305                                 return_type, 0, loc)
1306                 {
1307                         this.DelegateType = delegate_type;
1308                         this.root_scope = root_scope;
1309                 }
1310
1311                 public override AnonymousMethodHost RootScope {
1312                         get { return root_scope; }
1313                 }
1314
1315                 public override bool IsIterator {
1316                         get { return false; }
1317                 }
1318
1319                 public Expression AnonymousDelegate {
1320                         get { return anonymous_delegate; }
1321                 }
1322
1323                 public override string GetSignatureForError ()
1324                 {
1325                         return TypeManager.CSharpName (DelegateType);
1326                 }
1327
1328                 //
1329                 // Creates the host for the anonymous method
1330                 //
1331                 protected override Method DoCreateMethodHost (EmitContext ec)
1332                 {
1333                         string name = "<>c__AnonymousMethod" + anonymous_method_count++;
1334                         MemberName member_name;
1335
1336                         GenericMethod generic_method = null;
1337                         if (TypeManager.IsGenericType (DelegateType)) {
1338                                 TypeArguments args = new TypeArguments (Location);
1339
1340                                 Type[] tparam = TypeManager.GetTypeArguments (DelegateType);
1341                                 for (int i = 0; i < tparam.Length; i++)
1342                                         args.Add (new SimpleName (tparam [i].Name, Location));
1343
1344                                 member_name = new MemberName (name, args, Location);
1345
1346                                 generic_method = new GenericMethod (
1347                                         RootScope.NamespaceEntry, RootScope, member_name,
1348                                         new TypeExpression (ReturnType, Location), Parameters);
1349
1350                                 generic_method.SetParameterInfo (null);
1351                         } else
1352                                 member_name = new MemberName (name, Location);
1353
1354                         return new AnonymousMethodMethod (
1355                                 this, generic_method, new TypeExpression (ReturnType, Location),
1356                                 Modifiers.INTERNAL, member_name, Parameters);
1357                 }
1358
1359                 public override bool Resolve (EmitContext ec)
1360                 {
1361                         if (!base.Resolve (ec))
1362                                 return false;
1363
1364                         anonymous_delegate = new AnonymousDelegate (
1365                                 this, DelegateType, Location).Resolve (ec);
1366                         if (anonymous_delegate == null)
1367                                 return false;
1368
1369                         return true;
1370                 }
1371
1372                 public MethodInfo GetMethodBuilder (EmitContext ec)
1373                 {
1374                         MethodInfo builder = method.MethodBuilder;
1375                         if ((RootScope != null) && RootScope.IsGeneric) {
1376                                 Type scope_type = RootScope.GetScopeType (ec);
1377                                 if (scope_type == null)
1378                                         throw new InternalErrorException ();
1379
1380                                 MethodGroupExpr mg = (MethodGroupExpr) Expression.MemberLookup (
1381                                         ec.ContainerType, scope_type, builder.Name, Location);
1382
1383                                 if (mg == null)
1384                                         throw new InternalErrorException ();
1385                                 builder = (MethodInfo) mg.Methods [0];
1386                         }
1387
1388 #if GMCS_SOURCE
1389                         if (!DelegateType.IsGenericType)
1390                                 return builder;
1391
1392                         Type[] targs = TypeManager.GetTypeArguments (DelegateType);
1393                         return builder.MakeGenericMethod (targs);
1394 #else
1395                         return builder;
1396 #endif
1397                 }
1398
1399                 public static void Error_AddressOfCapturedVar (string name, Location loc)
1400                 {
1401                         Report.Error (1686, loc,
1402                                       "Local variable `{0}' or its members cannot have their " +
1403                                       "address taken and be used inside an anonymous method block",
1404                                       name);
1405                 }
1406         }
1407
1408         //
1409         // This will emit the code for the delegate, as well delegate creation on the host
1410         //
1411         public class AnonymousDelegate : DelegateCreation {
1412                 AnonymousMethod am;
1413
1414                 public AnonymousDelegate (AnonymousMethod am, Type target_type, Location l)
1415                 {
1416                         type = target_type;
1417                         loc = l;
1418                         this.am = am;
1419                 }
1420
1421                 public override Expression DoResolve (EmitContext ec)
1422                 {
1423                         eclass = ExprClass.Value;
1424
1425                         return this;
1426                 }
1427
1428                 public override void Emit (EmitContext ec)
1429                 {
1430                         //
1431                         // Now emit the delegate creation.
1432                         //
1433                         if ((am.Method.ModFlags & Modifiers.STATIC) == 0) {
1434                                 delegate_instance_expression = am.RootScope.GetScopeInitializer (ec);
1435
1436                                 if (delegate_instance_expression == null)
1437                                         throw new InternalErrorException ();
1438                         }
1439
1440                         Expression ml = Expression.MemberLookup (
1441                                 ec.ContainerType, type, ".ctor", MemberTypes.Constructor,
1442                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
1443                                 loc);
1444
1445                         constructor_method = ((MethodGroupExpr) ml).Methods [0];
1446                         delegate_method = am.GetMethodBuilder (ec);
1447                         base.Emit (ec);
1448                 }
1449         }
1450 }