mcs/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 // (C) 2004 Novell, Inc
  11
  12 using System;
  13 using System.Collections;
  14 using System.Reflection;
  15 using System.Reflection.Emit;
  16 using System.Diagnostics;
  17
  18 namespace Mono.CSharp {
  19
  20         public enum LanguageVersion
  21         {
  22                 Default = 0,
  23                 ISO_1   = 1,
  24                 LINQ
  25         }
  26
  27         public class RootContext {
  28
  29                 //
  30                 // Contains the parsed tree
  31                 //
  32                 static RootTypes root;
  33
  34                 //
  35                 // This hashtable contains all of the #definitions across the source code
  36                 // it is used by the ConditionalAttribute handler.
  37                 //
  38                 public static Hashtable AllDefines = new Hashtable ();
  39
  40                 //
  41                 // Whether we are being linked against the standard libraries.
  42                 // This is only used to tell whether `System.Object' should
  43                 // have a base class or not.
  44                 //
  45                 public static bool StdLib;
  46
  47                 //
  48                 // This keeps track of the order in which classes were defined
  49                 // so that we can poulate them in that order.
  50                 //
  51                 // Order is important, because we need to be able to tell, by
  52                 // examining the list of methods of the base class, which ones are virtual
  53                 // or abstract as well as the parent names (to implement new,
  54                 // override).
  55                 //
  56                 static ArrayList type_container_resolve_order;
  57
  58                 //
  59                 // Holds a reference to the Private Implementation Details
  60                 // class.
  61                 //
  62                 static ArrayList helper_classes;
  63
  64                 static TypeBuilder impl_details_class;
  65
  66                 public static int WarningLevel;
  67
  68                 public static Target Target;
  69                 public static string TargetExt;
  70
  71                 public static bool VerifyClsCompliance = true;
  72
  73                 /// <summary>
  74                 /// Holds /optimize option
  75                 /// </summary>
  76                 public static bool Optimize = true;
  77
  78                 public static LanguageVersion Version;
  79
  80                 //
  81                 // We keep strongname related info here because
  82                 // it's also used as complier options from CSC 8.x
  83                 //
  84                 public static string StrongNameKeyFile;
  85                 public static string StrongNameKeyContainer;
  86                 public static bool StrongNameDelaySign;
  87
  88                 //
  89                 // If set, enable XML documentation generation
  90                 //
  91                 public static Documentation Documentation;
  92
  93                 static public string MainClass;
  94
  95                 //
  96                 // Constructor
  97                 //
  98                 static RootContext ()
  99                 {
 100                         Reset ();
 101                 }
 102
 103                 public static void Reset ()
 104                 {
 105                         root = new RootTypes ();
 106                         type_container_resolve_order = new ArrayList ();
 107                         EntryPoint = null;
 108                         WarningLevel = 3;
 109                         Checked = false;
 110                         Unsafe = false;
 111                         StdLib = true;
 112                         StrongNameKeyFile = null;
 113                         StrongNameKeyContainer = null;
 114                         StrongNameDelaySign = false;
 115                         MainClass = null;
 116                         Target = Target.Exe;
 117                         TargetExt = ".exe";
 118                         Version = LanguageVersion.Default;
 119                         Documentation = null;
 120                         impl_details_class = null;
 121                         helper_classes = null;
 122                 }
 123
 124                 public static bool NeedsEntryPoint {
 125                         get { return RootContext.Target == Target.Exe || RootContext.Target == Target.WinExe; }
 126                 }
 127
 128                 static public RootTypes ToplevelTypes {
 129                         get { return root; }
 130                 }
 131
 132                 public static void RegisterOrder (TypeContainer tc)
 133                 {
 134                         type_container_resolve_order.Add (tc);
 135                 }
 136
 137                 //
 138                 // The default compiler checked state
 139                 //
 140                 static public bool Checked;
 141
 142                 //
 143                 // Whether to allow Unsafe code
 144                 //
 145                 static public bool Unsafe;
 146
 147                 // <remarks>
 148                 //   This function is used to resolve the hierarchy tree.
 149                 //   It processes interfaces, structs and classes in that order.
 150                 //
 151                 //   It creates the TypeBuilder's as it processes the user defined
 152                 //   types.
 153                 // </remarks>
 154                 static public void ResolveTree ()
 155                 {
 156                         //
 157                         // Interfaces are processed next, as classes and
 158                         // structs might inherit from an object or implement
 159                         // a set of interfaces, we need to be able to tell
 160                         // them appart by just using the TypeManager.
 161                         //
 162                         foreach (TypeContainer tc in root.Types)
 163                                 tc.CreateType ();
 164
 165                         foreach (TypeContainer tc in root.Types)
 166                                 tc.DefineType ();
 167
 168                         if (root.Delegates != null)
 169                                 foreach (Delegate d in root.Delegates)
 170                                         d.DefineType ();
 171                 }
 172
 173                 static void Error_TypeConflict (string name, Location loc)
 174                 {
 175                         Report.Error (
 176                                 520, loc, "`" + name + "' conflicts with a predefined type");
 177                 }
 178
 179                 static void Error_TypeConflict (string name)
 180                 {
 181                         Report.Error (
 182                                 520, "`" + name + "' conflicts with a predefined type");
 183                 }
 184
 185                 //
 186                 // Resolves a single class during the corlib bootstrap process
 187                 //
 188                 static Type BootstrapCorlib_ResolveClass (TypeContainer root, string name)
 189                 {
 190                         object o = root.GetDefinition (name);
 191                         if (o == null){
 192                                 Report.Error (518, "The predefined type `" + name + "' is not defined or imported");
 193                                 return null;
 194                         }
 195
 196                         if (!(o is Class)){
 197                                 if (o is DeclSpace){
 198                                         DeclSpace d = (DeclSpace) o;
 199
 200                                         Error_TypeConflict (name, d.Location);
 201                                 } else
 202                                         Error_TypeConflict (name);
 203
 204                                 return null;
 205                         }
 206
 207                         Type t = ((DeclSpace) o).DefineType ();
 208                         if (t != null)
 209                                 AttributeTester.RegisterNonObsoleteType (t);
 210                         return t;
 211                 }
 212
 213                 //
 214                 // Resolves a struct during the corlib bootstrap process
 215                 //
 216                 static void BootstrapCorlib_ResolveStruct (TypeContainer root, string name)
 217                 {
 218                         object o = root.GetDefinition (name);
 219                         if (o == null){
 220                                 Report.Error (518, "The predefined type `" + name + "' is not defined or imported");
 221                                 return;
 222                         }
 223
 224                         if (!(o is Struct)){
 225                                 if (o is DeclSpace){
 226                                         DeclSpace d = (DeclSpace) o;
 227
 228                                         Error_TypeConflict (name, d.Location);
 229                                 } else
 230                                         Error_TypeConflict (name);
 231
 232                                 return;
 233                         }
 234
 235                         ((DeclSpace) o).DefineType ();
 236                 }
 237
 238                 //
 239                 // Resolves a struct during the corlib bootstrap process
 240                 //
 241                 static void BootstrapCorlib_ResolveInterface (TypeContainer root, string name)
 242                 {
 243                         object o = root.GetDefinition (name);
 244                         if (o == null){
 245                                 Report.Error (518, "The predefined type `" + name + "' is not defined or imported");
 246                                 return;
 247                         }
 248
 249                         if (!(o is Interface)){
 250                                 if (o is DeclSpace){
 251                                         DeclSpace d = (DeclSpace) o;
 252
 253                                         Error_TypeConflict (name, d.Location);
 254                                 } else
 255                                         Error_TypeConflict (name);
 256
 257                                 return;
 258                         }
 259
 260                         Type t = ((DeclSpace) o).DefineType ();
 261                         if (t != null)
 262                                 AttributeTester.RegisterNonObsoleteType (t);
 263                 }
 264
 265                 //
 266                 // Resolves a delegate during the corlib bootstrap process
 267                 //
 268                 static void BootstrapCorlib_ResolveDelegate (TypeContainer root, string name)
 269                 {
 270                         object o = root.GetDefinition (name);
 271                         if (o == null){
 272                                 Report.Error (518, "The predefined type `" + name + "' is not defined or imported");
 273                                 return;
 274                         }
 275
 276                         if (!(o is Delegate)){
 277                                 Error_TypeConflict (name);
 278                                 return;
 279                         }
 280
 281                         ((DeclSpace) o).DefineType ();
 282                 }
 283
 284
 285                 /// <summary>
 286                 ///    Resolves the core types in the compiler when compiling with --nostdlib
 287                 /// </summary>
 288                 static public void ResolveCore ()
 289                 {
 290                         TypeManager.object_type = BootstrapCorlib_ResolveClass (root, "System.Object");
 291                         TypeManager.system_object_expr.Type = TypeManager.object_type;
 292                         TypeManager.value_type = BootstrapCorlib_ResolveClass (root, "System.ValueType");
 293                         TypeManager.system_valuetype_expr.Type = TypeManager.value_type;
 294
 295                         //
 296                         // The core attributes
 297                         //
 298                         BootstrapCorlib_ResolveInterface (root, "System.Runtime.InteropServices._Attribute");
 299                         TypeManager.attribute_type = BootstrapCorlib_ResolveClass (root, "System.Attribute");
 300                         TypeManager.obsolete_attribute_type = BootstrapCorlib_ResolveClass (root, "System.ObsoleteAttribute");
 301                         TypeManager.indexer_name_type = BootstrapCorlib_ResolveClass (root, "System.Runtime.CompilerServices.IndexerNameAttribute");
 302
 303                         string [] interfaces_first_stage = {
 304                                 "System.IComparable", "System.ICloneable",
 305                                 "System.IConvertible",
 306
 307                                 "System.Collections.IEnumerable",
 308                                 "System.Collections.ICollection",
 309                                 "System.Collections.IEnumerator",
 310                                 "System.Collections.IList",
 311                                 "System.IAsyncResult",
 312                                 "System.IDisposable",
 313
 314                                 "System.Runtime.Serialization.ISerializable",
 315
 316                                 "System.Reflection.IReflect",
 317                                 "System.Reflection.ICustomAttributeProvider",
 318 #if GMCS_SOURCE
 319                                 "System.Runtime.InteropServices._Exception",
 320
 321                                 //
 322                                 // Generic types
 323                                 //
 324                                 "System.Collections.Generic.IEnumerator`1",
 325                                 "System.Collections.Generic.IEnumerable`1"
 326 #endif
 327                         };
 328
 329                         foreach (string iname in interfaces_first_stage)
 330                                 BootstrapCorlib_ResolveInterface (root, iname);
 331
 332                         //
 333                         // These are the base value types
 334                         //
 335                         string [] structs_first_stage = {
 336                                 "System.Byte",    "System.SByte",
 337                                 "System.Int16",   "System.UInt16",
 338                                 "System.Int32",   "System.UInt32",
 339                                 "System.Int64",   "System.UInt64",
 340                         };
 341
 342                         foreach (string cname in structs_first_stage)
 343                                 BootstrapCorlib_ResolveStruct (root, cname);
 344
 345                         //
 346                         // Now, we can load the enumerations, after this point,
 347                         // we can use enums.
 348                         //
 349                         TypeManager.InitEnumUnderlyingTypes ();
 350
 351                         string [] structs_second_stage = {
 352                                 "System.Single",  "System.Double",
 353                                 "System.Char",    "System.Boolean",
 354                                 "System.Decimal", "System.Void",
 355                                 "System.RuntimeFieldHandle",
 356                                 "System.RuntimeArgumentHandle",
 357                                 "System.RuntimeTypeHandle",
 358                                 "System.IntPtr",
 359                                 "System.TypedReference",
 360                                 "System.ArgIterator"
 361                         };
 362
 363                         foreach (string cname in structs_second_stage)
 364                                 BootstrapCorlib_ResolveStruct (root, cname);
 365
 366                         //
 367                         // These are classes that depends on the core interfaces
 368                         //
 369                         string [] classes_second_stage = {
 370                                 "System.Enum",
 371                                 "System.String",
 372                                 "System.Array",
 373                                 "System.Reflection.MemberInfo",
 374                                 "System.Type",
 375                                 "System.Exception",
 376 #if GMCS_SOURCE
 377                                 "System.Activator",
 378 #endif
 379
 380                                 //
 381                                 // These are not really important in the order, but they
 382                                 // are used by the compiler later on (typemanager/CoreLookupType-d)
 383                                 //
 384                                 "System.Runtime.CompilerServices.RuntimeHelpers",
 385                                 "System.Reflection.DefaultMemberAttribute",
 386                                 "System.Threading.Monitor",
 387                                 "System.Threading.Interlocked",
 388
 389                                 "System.AttributeUsageAttribute",
 390                                 "System.Runtime.InteropServices.DllImportAttribute",
 391                                 "System.Runtime.CompilerServices.MethodImplAttribute",
 392                                 "System.Runtime.InteropServices.MarshalAsAttribute",
 393 #if GMCS_SOURCE
 394                                 "System.Runtime.CompilerServices.CompilerGeneratedAttribute",
 395                                 "System.Runtime.CompilerServices.FixedBufferAttribute",
 396 #endif
 397                                 "System.Diagnostics.ConditionalAttribute",
 398                                 "System.ParamArrayAttribute",
 399                                 "System.CLSCompliantAttribute",
 400                                 "System.Security.UnverifiableCodeAttribute",
 401                                 "System.Security.Permissions.SecurityAttribute",
 402                                 "System.Runtime.CompilerServices.DecimalConstantAttribute",
 403                                 "System.Runtime.InteropServices.InAttribute",
 404                                 "System.Runtime.InteropServices.OutAttribute",
 405                                 "System.Runtime.InteropServices.StructLayoutAttribute",
 406                                 "System.Runtime.InteropServices.FieldOffsetAttribute",
 407 #if GMCS_SOURCE
 408                                 "System.Runtime.InteropServices.DefaultCharSetAttribute",
 409 #endif
 410                                 "System.InvalidOperationException",
 411                                 "System.NotSupportedException",
 412                                 "System.MarshalByRefObject",
 413                                 "System.Security.CodeAccessPermission",
 414                                 "System.Runtime.CompilerServices.RequiredAttributeAttribute",
 415                                 "System.Runtime.InteropServices.GuidAttribute",
 416                                 "System.Reflection.AssemblyCultureAttribute"
 417                         };
 418
 419                         foreach (string cname in classes_second_stage)
 420                                 BootstrapCorlib_ResolveClass (root, cname);
 421 #if GMCS_SOURCE
 422                         BootstrapCorlib_ResolveStruct (root, "System.Nullable`1");
 423 #endif
 424                         BootstrapCorlib_ResolveDelegate (root, "System.AsyncCallback");
 425
 426                         // These will be defined indirectly during the previous ResolveDelegate.
 427                         // However make sure the rest of the checks happen.
 428                         string [] delegate_types = { "System.Delegate", "System.MulticastDelegate" };
 429                         foreach (string cname in delegate_types)
 430                                 BootstrapCorlib_ResolveClass (root, cname);
 431                 }
 432
 433                 // <summary>
 434                 //   Closes all open types
 435                 // </summary>
 436                 //
 437                 // <remarks>
 438                 //   We usually use TypeBuilder types.  When we are done
 439                 //   creating the type (which will happen after we have added
 440                 //   methods, fields, etc) we need to "Define" them before we
 441                 //   can save the Assembly
 442                 // </remarks>
 443                 static public void CloseTypes ()
 444                 {
 445                         //
 446                         // We do this in two passes, first we close the structs,
 447                         // then the classes, because it seems the code needs it this
 448                         // way.  If this is really what is going on, we should probably
 449                         // make sure that we define the structs in order as well.
 450                         //
 451                         foreach (TypeContainer tc in type_container_resolve_order){
 452                                 if (tc.Kind == Kind.Struct && tc.Parent == root){
 453                                         tc.CloseType ();
 454                                 }
 455                         }
 456
 457                         foreach (TypeContainer tc in type_container_resolve_order){
 458                                 if (!(tc.Kind == Kind.Struct && tc.Parent == root))
 459                                         tc.CloseType ();
 460                         }
 461
 462                         if (root.Delegates != null)
 463                                 foreach (Delegate d in root.Delegates)
 464                                         d.CloseType ();
 465
 466
 467                         //
 468                         // If we have a <PrivateImplementationDetails> class, close it
 469                         //
 470                         if (helper_classes != null){
 471                                 foreach (TypeBuilder type_builder in helper_classes) {
 472 #if GMCS_SOURCE
 473                                         type_builder.SetCustomAttribute (TypeManager.compiler_generated_attr);
 474 #endif
 475                                         type_builder.CreateType ();
 476                                 }
 477                         }
 478
 479                         type_container_resolve_order = null;
 480                         helper_classes = null;
 481                         //root = null;
 482                         TypeManager.CleanUp ();
 483                 }
 484
 485                 /// <summary>
 486                 ///   Used to register classes that need to be closed after all the
 487                 ///   user defined classes
 488                 /// </summary>
 489                 public static void RegisterCompilerGeneratedType (TypeBuilder helper_class)
 490                 {
 491                         if (helper_classes == null)
 492                                 helper_classes = new ArrayList ();
 493
 494                         helper_classes.Add (helper_class);
 495                 }
 496
 497                 static public void PopulateCoreType (TypeContainer root, string name)
 498                 {
 499                         DeclSpace ds = (DeclSpace) root.GetDefinition (name);
 500
 501                         ds.DefineMembers ();
 502                         ds.Define ();
 503                 }
 504
 505                 static public void BootCorlib_PopulateCoreTypes ()
 506                 {
 507                         PopulateCoreType (root, "System.Object");
 508                         PopulateCoreType (root, "System.ValueType");
 509                         PopulateCoreType (root, "System.Attribute");
 510                         PopulateCoreType (root, "System.Runtime.CompilerServices.IndexerNameAttribute");
 511                 }
 512
 513                 // <summary>
 514                 //   Populates the structs and classes with fields and methods
 515                 // </summary>
 516                 //
 517                 // This is invoked after all interfaces, structs and classes
 518                 // have been defined through `ResolveTree'
 519                 static public void PopulateTypes ()
 520                 {
 521
 522                         if (type_container_resolve_order != null){
 523                                 foreach (TypeContainer tc in type_container_resolve_order)
 524                                         tc.ResolveType ();
 525                                 foreach (TypeContainer tc in type_container_resolve_order)
 526                                         tc.DefineMembers ();
 527                         }
 528
 529                         ArrayList delegates = root.Delegates;
 530                         if (delegates != null){
 531                                 foreach (Delegate d in delegates)
 532                                         d.DefineMembers ();
 533                         }
 534
 535                         //
 536                         // Check for cycles in the struct layout
 537                         //
 538                         if (type_container_resolve_order != null){
 539                                 Hashtable seen = new Hashtable ();
 540                                 foreach (TypeContainer tc in type_container_resolve_order)
 541                                         TypeManager.CheckStructCycles (tc, seen);
 542                         }
 543                 }
 544
 545                 //
 546                 // A generic hook delegate
 547                 //
 548                 public delegate void Hook ();
 549
 550                 //
 551                 // A hook invoked when the code has been generated.
 552                 //
 553                 public static event Hook EmitCodeHook;
 554
 555                 //
 556                 // DefineTypes is used to fill in the members of each type.
 557                 //
 558                 static public void DefineTypes ()
 559                 {
 560                         ArrayList delegates = root.Delegates;
 561                         if (delegates != null){
 562                                 foreach (Delegate d in delegates)
 563                                         d.Define ();
 564                         }
 565
 566                         if (type_container_resolve_order != null){
 567                                 foreach (TypeContainer tc in type_container_resolve_order) {
 568                                         // When compiling corlib, these types have already been
 569                                         // populated from BootCorlib_PopulateCoreTypes ().
 570                                         if (!RootContext.StdLib &&
 571                                             ((tc.Name == "System.Object") ||
 572                                              (tc.Name == "System.Attribute") ||
 573                                              (tc.Name == "System.ValueType") ||
 574                                              (tc.Name == "System.Runtime.CompilerServices.IndexerNameAttribute")))
 575                                                 continue;
 576
 577                                         tc.Define ();
 578                                 }
 579                         }
 580                 }
 581
 582                 static public void EmitCode ()
 583                 {
 584                         if (type_container_resolve_order != null) {
 585                                 foreach (TypeContainer tc in type_container_resolve_order)
 586                                         tc.EmitType ();
 587
 588                                 if (Report.Errors > 0)
 589                                         return;
 590
 591                                 foreach (TypeContainer tc in type_container_resolve_order)
 592                                         tc.VerifyMembers ();
 593                         }
 594
 595                         if (root.Delegates != null) {
 596                                 foreach (Delegate d in root.Delegates)
 597                                         d.Emit ();
 598                         }
 599                         //
 600                         // Run any hooks after all the types have been defined.
 601                         // This is used to create nested auxiliary classes for example
 602                         //
 603
 604                         if (EmitCodeHook != null)
 605                                 EmitCodeHook ();
 606
 607                         CodeGen.Assembly.Emit (root);
 608                         CodeGen.Module.Emit (root);
 609                 }
 610
 611                 //
 612                 // Public Field, used to track which method is the public entry
 613                 // point.
 614                 //
 615                 static public MethodInfo EntryPoint;
 616
 617                 //
 618                 // Track the location of the entry point.
 619                 //
 620                 static public Location EntryPointLocation;
 621
 622                 //
 623                 // These are used to generate unique names on the structs and fields.
 624                 //
 625                 static int field_count;
 626
 627                 //
 628                 // Makes an initialized struct, returns the field builder that
 629                 // references the data.  Thanks go to Sergey Chaban for researching
 630                 // how to do this.  And coming up with a shorter mechanism than I
 631                 // was able to figure out.
 632                 //
 633                 // This works but makes an implicit public struct $ArrayType$SIZE and
 634                 // makes the fields point to it.  We could get more control if we did
 635                 // use instead:
 636                 //
 637                 // 1. DefineNestedType on the impl_details_class with our struct.
 638                 //
 639                 // 2. Define the field on the impl_details_class
 640                 //
 641                 static public FieldBuilder MakeStaticData (byte [] data)
 642                 {
 643                         FieldBuilder fb;
 644
 645                         if (impl_details_class == null){
 646                                 impl_details_class = CodeGen.Module.Builder.DefineType (
 647                                         "<PrivateImplementationDetails>",
 648                                         TypeAttributes.NotPublic,
 649                                         TypeManager.object_type);
 650
 651                                 RegisterCompilerGeneratedType (impl_details_class);
 652                         }
 653
 654                         fb = impl_details_class.DefineInitializedData (
 655                                 "$$field-" + (field_count++), data,
 656                                 FieldAttributes.Static | FieldAttributes.Assembly);
 657
 658                         return fb;
 659                 }
 660
 661                 public static void CheckUnsafeOption (Location loc)
 662                 {
 663                         if (!Unsafe) {
 664                                 Report.Error (227, loc,
 665                                         "Unsafe code requires the `unsafe' command line option to be specified");
 666                         }
 667                 }
 668         }
 669 }
 670
 671