mcs/gmcs/rootcontext.cs

   1 //
   2 // rootcontext.cs: keeps track of our tree representation, and assemblies loaded.
   3 //
   4 // Author: Miguel de Icaza (miguel@ximian.com)
   5 //         Ravi Pratap     (ravi@ximian.com)
   6 //
   7 // Licensed under the terms of the GNU GPL
   8 //
   9 // (C) 2001 Ximian, Inc (http://www.ximian.com)
  10
  11 using System;
  12 using System.Collections;
  13 using System.Reflection;
  14 using System.Reflection.Emit;
  15 using System.Diagnostics;
  16
  17 namespace Mono.CSharp {
  18
  19         public class RootContext {
  20
  21                 //
  22                 // Contains the parsed tree
  23                 //
  24                 static Tree tree;
  25
  26                 //
  27                 // This hashtable contains all of the #definitions across the source code
  28                 // it is used by the ConditionalAttribute handler.
  29                 //
  30                 public static Hashtable AllDefines = new Hashtable ();
  31
  32                 //
  33                 // Whether we are being linked against the standard libraries.
  34                 // This is only used to tell whether `System.Object' should
  35                 // have a parent or not.
  36                 //
  37                 public static bool StdLib = true;
  38
  39                 //
  40                 // This keeps track of the order in which classes were defined
  41                 // so that we can poulate them in that order.
  42                 //
  43                 // Order is important, because we need to be able to tell by
  44                 // examining the parent's list of methods which ones are virtual
  45                 // or abstract as well as the parent names (to implement new,
  46                 // override).
  47                 //
  48                 static ArrayList type_container_resolve_order;
  49                 static ArrayList interface_resolve_order;
  50                 static ArrayList attribute_types;
  51
  52                 //
  53                 // Holds a reference to the Private Implementation Details
  54                 // class.
  55                 //
  56                 static ArrayList helper_classes;
  57
  58                 static TypeBuilder impl_details_class;
  59
  60                 public static int WarningLevel = 2;
  61
  62                 public static Target Target = Target.Exe;
  63                 public static string TargetExt = ".exe";
  64
  65                 //
  66                 // If set, enable C# version 2 features
  67                 //
  68                 public static bool V2;
  69                 //
  70                 // Constructor
  71                 //
  72                 static RootContext ()
  73                 {
  74                         tree = new Tree ();
  75                         interface_resolve_order = new ArrayList ();
  76                         type_container_resolve_order = new ArrayList ();
  77                 }
  78
  79                 public static bool NeedsEntryPoint {
  80                         get {
  81                                 return RootContext.Target == Target.Exe || RootContext.Target == Target.WinExe;
  82                         }
  83                 }
  84
  85                 static public Tree Tree {
  86                         get {
  87                                 return tree;
  88                         }
  89                 }
  90
  91                 static public string MainClass;
  92
  93                 public static void RegisterOrder (Interface iface)
  94                 {
  95                         interface_resolve_order.Add (iface);
  96                 }
  97
  98                 public static void RegisterOrder (TypeContainer tc)
  99                 {
 100                         type_container_resolve_order.Add (tc);
 101                 }
 102
 103                 public static void RegisterAttribute (TypeContainer tc)
 104                 {
 105                         if (attribute_types == null)
 106                                 attribute_types = new ArrayList ();
 107
 108                         attribute_types.Add (tc);
 109                 }
 110
 111                 //
 112                 // The default compiler checked state
 113                 //
 114                 static public bool Checked = false;
 115
 116                 //
 117                 // Whether to allow Unsafe code
 118                 //
 119                 static public bool Unsafe = false;
 120
 121                 static string MakeFQN (string nsn, string name)
 122                 {
 123                         if (nsn == "")
 124                                 return name;
 125                         return String.Concat (nsn, ".", name);
 126                 }
 127
 128                 // <remarks>
 129                 //   This function is used to resolve the hierarchy tree.
 130                 //   It processes interfaces, structs and classes in that order.
 131                 //
 132                 //   It creates the TypeBuilder's as it processes the user defined
 133                 //   types.
 134                 // </remarks>
 135                 static public void ResolveTree ()
 136                 {
 137                         //
 138                         // Process the attribute types separately and before anything else
 139                         //
 140                         if (attribute_types != null)
 141                                 foreach (TypeContainer tc in attribute_types)
 142                                         tc.DefineType ();
 143
 144                         //
 145                         // Interfaces are processed next, as classes and
 146                         // structs might inherit from an object or implement
 147                         // a set of interfaces, we need to be able to tell
 148                         // them appart by just using the TypeManager.
 149                         //
 150                         TypeContainer root = Tree.Types;
 151
 152                         ArrayList ifaces = root.Interfaces;
 153                         if (ifaces != null){
 154                                 foreach (Interface i in ifaces)
 155                                         i.DefineType ();
 156                         }
 157
 158                         foreach (TypeContainer tc in root.Types)
 159                                 tc.DefineType ();
 160
 161                         if (root.Delegates != null)
 162                                 foreach (Delegate d in root.Delegates)
 163                                         d.DefineType ();
 164
 165                         if (root.Enums != null)
 166                                 foreach (Enum e in root.Enums)
 167                                         e.DefineType ();
 168                 }
 169
 170                 static void Error_TypeConflict (string name, Location loc)
 171                 {
 172                         Report.Error (
 173                                 520, loc, "`" + name + "' conflicts with a predefined type");
 174                 }
 175
 176                 static void Error_TypeConflict (string name)
 177                 {
 178                         Report.Error (
 179                                 520, "`" + name + "' conflicts with a predefined type");
 180                 }
 181
 182                 //
 183                 // Resolves a single class during the corlib bootstrap process
 184                 //
 185                 static TypeBuilder BootstrapCorlib_ResolveClass (TypeContainer root, string name)
 186                 {
 187                         object o = root.GetDefinition (name);
 188                         if (o == null){
 189                                 Report.Error (518, "The predefined type `" + name + "' is not defined");
 190                                 return null;
 191                         }
 192
 193                         if (!(o is Class)){
 194                                 if (o is DeclSpace){
 195                                         DeclSpace d = (DeclSpace) o;
 196
 197                                         Error_TypeConflict (name, d.Location);
 198                                 } else
 199                                         Error_TypeConflict (name);
 200
 201                                 return null;
 202                         }
 203
 204                         return ((DeclSpace) o).DefineType ();
 205                 }
 206
 207                 //
 208                 // Resolves a struct during the corlib bootstrap process
 209                 //
 210                 static void BootstrapCorlib_ResolveStruct (TypeContainer root, string name)
 211                 {
 212                         object o = root.GetDefinition (name);
 213                         if (o == null){
 214                                 Report.Error (518, "The predefined type `" + name + "' is not defined");
 215                                 return;
 216                         }
 217
 218                         if (!(o is Struct)){
 219                                 if (o is DeclSpace){
 220                                         DeclSpace d = (DeclSpace) o;
 221
 222                                         Error_TypeConflict (name, d.Location);
 223                                 } else
 224                                         Error_TypeConflict (name);
 225
 226                                 return;
 227                         }
 228
 229                         ((DeclSpace) o).DefineType ();
 230                 }
 231
 232                 //
 233                 // Resolves a struct during the corlib bootstrap process
 234                 //
 235                 static void BootstrapCorlib_ResolveInterface (TypeContainer root, string name)
 236                 {
 237                         object o = root.GetDefinition (name);
 238                         if (o == null){
 239                                 Report.Error (518, "The predefined type `" + name + "' is not defined");
 240                                 return;
 241                         }
 242
 243                         if (!(o is Interface)){
 244                                 if (o is DeclSpace){
 245                                         DeclSpace d = (DeclSpace) o;
 246
 247                                         Error_TypeConflict (name, d.Location);
 248                                 } else
 249                                         Error_TypeConflict (name);
 250
 251                                 return;
 252                         }
 253
 254                         ((DeclSpace) o).DefineType ();
 255                 }
 256
 257                 //
 258                 // Resolves a delegate during the corlib bootstrap process
 259                 //
 260                 static void BootstrapCorlib_ResolveDelegate (TypeContainer root, string name)
 261                 {
 262                         object o = root.GetDefinition (name);
 263                         if (o == null){
 264                                 Report.Error (518, "The predefined type `" + name + "' is not defined");
 265                                 Environment.Exit (0);
 266                         }
 267
 268                         if (!(o is Delegate)){
 269                                 Error_TypeConflict (name);
 270                                 return;
 271                         }
 272
 273                         ((DeclSpace) o).DefineType ();
 274                 }
 275
 276
 277                 /// <summary>
 278                 ///    Resolves the core types in the compiler when compiling with --nostdlib
 279                 /// </summary>
 280                 static public void ResolveCore ()
 281                 {
 282                         TypeContainer root = Tree.Types;
 283
 284                         TypeManager.object_type = BootstrapCorlib_ResolveClass (root, "System.Object");
 285                         TypeManager.value_type = BootstrapCorlib_ResolveClass (root, "System.ValueType");
 286                         TypeManager.attribute_type = BootstrapCorlib_ResolveClass (root, "System.Attribute");
 287
 288                         string [] interfaces_first_stage = {
 289                                 "System.IComparable", "System.ICloneable",
 290                                 "System.IConvertible",
 291
 292                                 "System.Collections.IEnumerable",
 293                                 "System.Collections.ICollection",
 294                                 "System.Collections.IEnumerator",
 295                                 "System.Collections.IList",
 296                                 "System.IAsyncResult",
 297                                 "System.IDisposable",
 298
 299                                 "System.Runtime.Serialization.ISerializable",
 300
 301                                 "System.Reflection.IReflect",
 302                                 "System.Reflection.ICustomAttributeProvider"
 303                         };
 304
 305                         foreach (string iname in interfaces_first_stage)
 306                                 BootstrapCorlib_ResolveInterface (root, iname);
 307
 308                         //
 309                         // These are the base value types
 310                         //
 311                         string [] structs_first_stage = {
 312                                 "System.Byte",    "System.SByte",
 313                                 "System.Int16",   "System.UInt16",
 314                                 "System.Int32",   "System.UInt32",
 315                                 "System.Int64",   "System.UInt64",
 316                         };
 317
 318                         foreach (string cname in structs_first_stage)
 319                                 BootstrapCorlib_ResolveStruct (root, cname);
 320
 321                         //
 322                         // Now, we can load the enumerations, after this point,
 323                         // we can use enums.
 324                         //
 325                         TypeManager.InitEnumUnderlyingTypes ();
 326
 327                         string [] structs_second_stage = {
 328                                 "System.Single",  "System.Double",
 329                                 "System.Char",    "System.Boolean",
 330                                 "System.Decimal", "System.Void",
 331                                 "System.RuntimeFieldHandle",
 332                                 "System.RuntimeTypeHandle",
 333                                 "System.IntPtr"
 334                         };
 335
 336                         foreach (string cname in structs_second_stage)
 337                                 BootstrapCorlib_ResolveStruct (root, cname);
 338
 339                         //
 340                         // These are classes that depends on the core interfaces
 341                         //
 342                         string [] classes_second_stage = {
 343                                 "System.Reflection.MemberInfo",
 344                                 "System.Type",
 345                                 "System.Exception",
 346
 347                                 //
 348                                 // These are not really important in the order, but they
 349                                 // are used by the compiler later on (typemanager/CoreLookupType-d)
 350                                 //
 351                                 "System.Runtime.CompilerServices.RuntimeHelpers",
 352                                 "System.Reflection.DefaultMemberAttribute",
 353                                 "System.Threading.Monitor",
 354
 355                                 "System.AttributeUsageAttribute",
 356                                 "System.Runtime.InteropServices.DllImportAttribute",
 357                                 "System.Runtime.CompilerServices.MethodImplAttribute",
 358                                 "System.Runtime.InteropServices.MarshalAsAttribute",
 359                                 "System.Diagnostics.ConditionalAttribute",
 360                                 "System.ObsoleteAttribute",
 361                                 "System.ParamArrayAttribute",
 362                                 "System.Security.UnverifiableCodeAttribute",
 363                                 "System.Runtime.CompilerServices.IndexerNameAttribute",
 364                                 "System.Runtime.InteropServices.InAttribute",
 365                                 "System.InvalidOperationException"
 366
 367                         };
 368
 369                         // We must store them here before calling BootstrapCorlib_ResolveDelegate.
 370                         TypeManager.string_type = BootstrapCorlib_ResolveClass (root, "System.String");
 371                         TypeManager.enum_type = BootstrapCorlib_ResolveClass (root, "System.Enum");
 372                         TypeManager.array_type = BootstrapCorlib_ResolveClass (root, "System.Array");
 373                         TypeManager.multicast_delegate_type = BootstrapCorlib_ResolveClass (root, "System.MulticastDelegate");
 374                         TypeManager.delegate_type = BootstrapCorlib_ResolveClass (root, "System.Delegate");
 375
 376                         foreach (string cname in classes_second_stage)
 377                                 BootstrapCorlib_ResolveClass (root, cname);
 378
 379                         BootstrapCorlib_ResolveDelegate (root, "System.AsyncCallback");
 380                 }
 381
 382                 // <summary>
 383                 //   Closes all open types
 384                 // </summary>
 385                 //
 386                 // <remarks>
 387                 //   We usually use TypeBuilder types.  When we are done
 388                 //   creating the type (which will happen after we have added
 389                 //   methods, fields, etc) we need to "Define" them before we
 390                 //   can save the Assembly
 391                 // </remarks>
 392                 static public void CloseTypes ()
 393                 {
 394                         TypeContainer root = Tree.Types;
 395
 396                         if (root.Enums != null)
 397                                 foreach (Enum en in root.Enums)
 398                                         en.CloseType ();
 399
 400                         if (attribute_types != null)
 401                                 foreach (TypeContainer tc in attribute_types)
 402                                         tc.CloseType ();
 403
 404                         foreach (Interface iface in interface_resolve_order)
 405                                 iface.CloseType ();
 406
 407                         //
 408                         // We do this in two passes, first we close the structs,
 409                         // then the classes, because it seems the code needs it this
 410                         // way.  If this is really what is going on, we should probably
 411                         // make sure that we define the structs in order as well.
 412                         //
 413                         foreach (TypeContainer tc in type_container_resolve_order){
 414                                 if (tc is Struct && tc.Parent == tree.Types){
 415                                         tc.CloseType ();
 416                                 }
 417                         }
 418
 419                         foreach (TypeContainer tc in type_container_resolve_order){
 420                                 if (!(tc is Struct && tc.Parent == tree.Types))
 421                                         tc.CloseType ();
 422                         }
 423
 424                         if (root.Delegates != null)
 425                                 foreach (Delegate d in root.Delegates)
 426                                         d.CloseType ();
 427
 428
 429                         //
 430                         // If we have a <PrivateImplementationDetails> class, close it
 431                         //
 432                         if (helper_classes != null){
 433                                 foreach (TypeBuilder type_builder in helper_classes)
 434                                         type_builder.CreateType ();
 435                         }
 436
 437                         attribute_types = null;
 438                         interface_resolve_order = null;
 439                         type_container_resolve_order = null;
 440                         helper_classes = null;
 441                         tree = null;
 442                         TypeManager.CleanUp ();
 443                 }
 444
 445                 /// <summary>
 446                 ///   Used to register classes that need to be closed after all the
 447                 ///   user defined classes
 448                 /// </summary>
 449                 public static void RegisterHelperClass (TypeBuilder helper_class)
 450                 {
 451                         if (helper_classes == null)
 452                                 helper_classes = new ArrayList ();
 453                         helper_classes.Add (helper_class);
 454                 }
 455
 456                 //
 457                 // This idea is from Felix Arrese-Igor
 458                 //
 459                 // Returns : the implicit parent of a composite namespace string
 460                 //   eg. Implicit parent of A.B is A
 461                 //
 462                 static public string ImplicitParent (string ns)
 463                 {
 464                         int i = ns.LastIndexOf ('.');
 465                         if (i < 0)
 466                                 return null;
 467
 468                         return ns.Substring (0, i);
 469                 }
 470
 471                 static Type NamespaceLookup (DeclSpace ds, string name, Location loc)
 472                 {
 473                         //
 474                         // Try in the current namespace and all its implicit parents
 475                         //
 476                         for (NamespaceEntry ns = ds.NamespaceEntry; ns != null; ns = ns.ImplicitParent) {
 477                                 object result = ns.Lookup (ds, name, loc);
 478                                 if (result == null)
 479                                         continue;
 480
 481                                 if (result is Type)
 482                                         return (Type) result;
 483
 484                                 return null;
 485                         }
 486
 487                         return null;
 488                 }
 489
 490                 //
 491                 // Public function used to locate types, this can only
 492                 // be used after the ResolveTree function has been invoked.
 493                 //
 494                 // Returns: Type or null if they type can not be found.
 495                 //
 496                 // Come to think of it, this should be a DeclSpace
 497                 //
 498                 static public Type LookupType (DeclSpace ds, string name, bool silent, Location loc)
 499                 {
 500                         Type t;
 501
 502                         if (ds.Cache.Contains (name)){
 503                                 t = (Type) ds.Cache [name];
 504                                 if (t != null)
 505                                         return t;
 506                         } else {
 507                                 //
 508                                 // For the case the type we are looking for is nested within this one
 509                                 // or is in any base class
 510                                 //
 511                                 DeclSpace containing_ds = ds;
 512                                 while (containing_ds != null){
 513                                         Type current_type = containing_ds.TypeBuilder;
 514
 515                                         while (current_type != null) {
 516                                                 //
 517                                                 // nested class
 518                                                 //
 519                                                 t = TypeManager.LookupType (current_type.FullName + "." + name);
 520                                                 if (t != null){
 521                                                         ds.Cache [name] = t;
 522                                                         return t;
 523                                                 }
 524
 525                                                 current_type = current_type.BaseType;
 526                                         }
 527
 528                                         containing_ds = containing_ds.Parent;
 529                                 }
 530
 531                                 t = NamespaceLookup (ds, name, loc);
 532                                 if (t != null){
 533                                         ds.Cache [name] = t;
 534                                         return t;
 535                                 }
 536                         }
 537
 538                         if (!silent)
 539                                 Report.Error (246, loc, "Cannot find type `"+name+"'");
 540
 541                         return null;
 542                 }
 543
 544                 // <summary>
 545                 //   This is the silent version of LookupType, you can use this
 546                 //   to `probe' for a type
 547                 // </summary>
 548                 static public Type LookupType (TypeContainer tc, string name, Location loc)
 549                 {
 550                         return LookupType (tc, name, true, loc);
 551                 }
 552
 553                 static public bool IsNamespace (string name)
 554                 {
 555                         Namespace ns;
 556
 557                         if (tree.Namespaces != null){
 558                                 ns = (Namespace) tree.Namespaces [name];
 559
 560                                 if (ns != null)
 561                                         return true;
 562                         }
 563
 564                         return false;
 565                 }
 566
 567                 static void Report1530 (Location loc)
 568                 {
 569                         Report.Error (1530, loc, "Keyword new not allowed for namespace elements");
 570                 }
 571
 572                 static public void PopulateCoreType (TypeContainer root, string name)
 573                 {
 574                         DeclSpace ds = (DeclSpace) root.GetDefinition (name);
 575
 576                         ds.DefineMembers (root);
 577                         ds.Define (root);
 578                 }
 579
 580                 static public void BootCorlib_PopulateCoreTypes ()
 581                 {
 582                         TypeContainer root = tree.Types;
 583
 584                         PopulateCoreType (root, "System.Object");
 585                         PopulateCoreType (root, "System.ValueType");
 586                         PopulateCoreType (root, "System.Attribute");
 587                 }
 588
 589                 // <summary>
 590                 //   Populates the structs and classes with fields and methods
 591                 // </summary>
 592                 //
 593                 // This is invoked after all interfaces, structs and classes
 594                 // have been defined through `ResolveTree'
 595                 static public void PopulateTypes ()
 596                 {
 597                         TypeContainer root = Tree.Types;
 598
 599                         if (attribute_types != null)
 600                                 foreach (TypeContainer tc in attribute_types)
 601                                         tc.DefineMembers (root);
 602
 603                         if (interface_resolve_order != null){
 604                                 foreach (Interface iface in interface_resolve_order)
 605                                         if ((iface.ModFlags & Modifiers.NEW) == 0)
 606                                                 iface.DefineMembers (root);
 607                                         else
 608                                                 Report1530 (iface.Location);
 609                         }
 610
 611
 612                         if (type_container_resolve_order != null){
 613                                 if (RootContext.StdLib){
 614                                         foreach (TypeContainer tc in type_container_resolve_order)
 615                                                 tc.DefineMembers (root);
 616                                 } else {
 617                                         foreach (TypeContainer tc in type_container_resolve_order) {
 618                                                 // When compiling corlib, these types have already been
 619                                                 // populated from BootCorlib_PopulateCoreTypes ().
 620                                                 if (((tc.Name == "System.Object") ||
 621                                                      (tc.Name == "System.Attribute") ||
 622                                                      (tc.Name == "System.ValueType")))
 623                                                 continue;
 624
 625                                                 tc.DefineMembers (root);
 626                                         }
 627                                 }
 628                         }
 629
 630                         ArrayList delegates = root.Delegates;
 631                         if (delegates != null){
 632                                 foreach (Delegate d in delegates)
 633                                         if ((d.ModFlags & Modifiers.NEW) == 0)
 634                                                 d.DefineMembers (root);
 635                                         else
 636                                                 Report1530 (d.Location);
 637                         }
 638
 639                         ArrayList enums = root.Enums;
 640                         if (enums != null){
 641                                 foreach (Enum en in enums)
 642                                         if ((en.ModFlags & Modifiers.NEW) == 0)
 643                                                 en.DefineMembers (root);
 644                                         else
 645                                                 Report1530 (en.Location);
 646                         }
 647                 }
 648
 649                 //
 650                 // A generic hook delegate
 651                 //
 652                 public delegate void Hook ();
 653
 654                 //
 655                 // A hook invoked when the code has been generated.
 656                 //
 657                 public static event Hook EmitCodeHook;
 658
 659                 //
 660                 // DefineTypes is used to fill in the members of each type.
 661                 //
 662                 static public void DefineTypes ()
 663                 {
 664                         TypeContainer root = Tree.Types;
 665
 666                         if (attribute_types != null)
 667                                 foreach (TypeContainer tc in attribute_types)
 668                                         tc.Define (root);
 669
 670                         if (interface_resolve_order != null){
 671                                 foreach (Interface iface in interface_resolve_order)
 672                                         if ((iface.ModFlags & Modifiers.NEW) == 0)
 673                                                 iface.Define (root);
 674                         }
 675
 676
 677                         if (type_container_resolve_order != null){
 678                                 foreach (TypeContainer tc in type_container_resolve_order) {
 679                                         // When compiling corlib, these types have already been
 680                                         // populated from BootCorlib_PopulateCoreTypes ().
 681                                         if (!RootContext.StdLib &&
 682                                             ((tc.Name == "System.Object") ||
 683                                              (tc.Name == "System.Attribute") ||
 684                                              (tc.Name == "System.ValueType")))
 685                                                 continue;
 686
 687                                         if ((tc.ModFlags & Modifiers.NEW) == 0)
 688                                                 tc.Define (root);
 689                                 }
 690                         }
 691
 692                         ArrayList delegates = root.Delegates;
 693                         if (delegates != null){
 694                                 foreach (Delegate d in delegates)
 695                                         if ((d.ModFlags & Modifiers.NEW) == 0)
 696                                                 d.Define (root);
 697                         }
 698
 699                         ArrayList enums = root.Enums;
 700                         if (enums != null){
 701                                 foreach (Enum en in enums)
 702                                         if ((en.ModFlags & Modifiers.NEW) == 0)
 703                                                 en.Define (root);
 704                         }
 705                 }
 706
 707                 static public void EmitCode ()
 708                 {
 709                         //
 710                         // Because of the strange way in which we do things, global
 711                         // attributes must be processed first.
 712                         //
 713                         CodeGen.Assembly.Emit ();
 714                         CodeGen.Module.Emit ();
 715
 716                         if (attribute_types != null)
 717                                 foreach (TypeContainer tc in attribute_types)
 718                                         tc.Emit ();
 719
 720                         if (interface_resolve_order != null){
 721                                 foreach (Interface iface in interface_resolve_order)
 722                                         iface.Emit (Tree.Types);
 723                         }
 724
 725                         if (type_container_resolve_order != null) {
 726                                 foreach (TypeContainer tc in type_container_resolve_order)
 727                                         tc.EmitConstants ();
 728
 729                                 foreach (TypeContainer tc in type_container_resolve_order)
 730                                         tc.Emit ();
 731                         }
 732
 733                         //
 734                         // Run any hooks after all the types have been defined.
 735                         // This is used to create nested auxiliary classes for example
 736                         //
 737
 738                         if (EmitCodeHook != null)
 739                                 EmitCodeHook ();
 740                 }
 741
 742                 //
 743                 // Public Field, used to track which method is the public entry
 744                 // point.
 745                 //
 746                 static public MethodInfo EntryPoint;
 747
 748                 //
 749                 // Track the location of the entry point.
 750                 //
 751                 static public Location EntryPointLocation;
 752
 753                 //
 754                 // These are used to generate unique names on the structs and fields.
 755                 //
 756                 static int field_count;
 757
 758                 //
 759                 // Makes an initialized struct, returns the field builder that
 760                 // references the data.  Thanks go to Sergey Chaban for researching
 761                 // how to do this.  And coming up with a shorter mechanism than I
 762                 // was able to figure out.
 763                 //
 764                 // This works but makes an implicit public struct $ArrayType$SIZE and
 765                 // makes the fields point to it.  We could get more control if we did
 766                 // use instead:
 767                 //
 768                 // 1. DefineNestedType on the impl_details_class with our struct.
 769                 //
 770                 // 2. Define the field on the impl_details_class
 771                 //
 772                 static public FieldBuilder MakeStaticData (byte [] data)
 773                 {
 774                         FieldBuilder fb;
 775
 776                         if (impl_details_class == null){
 777                                 impl_details_class = CodeGen.Module.Builder.DefineType (
 778                                         "<PrivateImplementationDetails>",
 779                                         TypeAttributes.NotPublic,
 780                                         TypeManager.object_type);
 781
 782                                 RegisterHelperClass (impl_details_class);
 783                         }
 784
 785                         fb = impl_details_class.DefineInitializedData (
 786                                 "$$field-" + (field_count++), data,
 787                                 FieldAttributes.Static | FieldAttributes.Assembly);
 788
 789                         return fb;
 790                 }
 791         }
 792 }
 793
 794