mcs/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 //            Marek Safar  (marek.safar@gmail.com)
   7 //
   8 //
   9 // Dual licensed under the terms of the MIT X11 or GNU GPL
  10 //
  11 // Copyright 2001 Ximian, Inc (http://www.ximian.com)
  12 // Copyright 2004-2008 Novell, Inc
  13
  14 using System;
  15 using System.Collections.Generic;
  16 using System.Reflection;
  17 using System.Reflection.Emit;
  18 using System.Diagnostics;
  19
  20 namespace Mono.CSharp {
  21
  22         public enum LanguageVersion
  23         {
  24                 ISO_1           = 1,
  25                 ISO_2           = 2,
  26                 V_3             = 3,
  27                 V_4             = 4,
  28                 Future          = 100,
  29
  30                 Default         = LanguageVersion.V_4,
  31         }
  32
  33         public enum MetadataVersion
  34         {
  35                 v1,
  36                 v2,
  37                 v4
  38         }
  39
  40         public class RootContext {
  41
  42                 //
  43                 // COMPILER OPTIONS CLASS
  44                 //
  45                 public static Target Target;
  46                 public static Platform Platform;
  47                 public static string TargetExt;
  48                 public static bool VerifyClsCompliance = true;
  49                 public static bool Optimize = true;
  50                 public static LanguageVersion Version;
  51                 public static bool EnhancedWarnings;
  52
  53                 public static MetadataVersion MetadataCompatibilityVersion;
  54
  55                 //
  56                 // We keep strongname related info here because
  57                 // it's also used as complier options from CSC 8.x
  58                 //
  59                 public static string StrongNameKeyFile;
  60                 public static string StrongNameKeyContainer;
  61                 public static bool StrongNameDelaySign;
  62
  63                 //
  64                 // If set, enable XML documentation generation
  65                 //
  66                 public static Documentation Documentation;
  67
  68                 static public string MainClass;
  69
  70                 //
  71                 // The default compiler checked state
  72                 //
  73                 static public bool Checked;
  74
  75                 //
  76                 // If true, it means that the compiler is executing as
  77                 // in eval mode so unresolved variables are resolved in
  78                 // static classes maintained by the eval engine.
  79                 //
  80                 static public bool EvalMode;
  81
  82                 //
  83                 // If true, the compiler is operating in statement mode,
  84                 // this currently turns local variable declaration into
  85                 // static variables of a class
  86                 //
  87                 static public bool StatementMode;
  88
  89                 //
  90                 // Whether to allow Unsafe code
  91                 //
  92                 static public bool Unsafe;
  93
  94                 //
  95                 // Whether we are being linked against the standard libraries.
  96                 // This is only used to tell whether `System.Object' should
  97                 // have a base class or not.
  98                 //
  99                 public static bool StdLib;
 100
 101                 public static bool NeedsEntryPoint {
 102                         get { return Target == Target.Exe || Target == Target.WinExe; }
 103                 }
 104
 105                 //
 106                 // COMPILER OPTIONS CLASS END
 107                 //
 108
 109                 //
 110                 // Contains the parsed tree
 111                 //
 112                 static ModuleCompiled root;
 113
 114                 //
 115                 // This hashtable contains all of the #definitions across the source code
 116                 // it is used by the ConditionalAttribute handler.
 117                 //
 118                 static List<string> AllDefines;
 119
 120                 //
 121                 // This keeps track of the order in which classes were defined
 122                 // so that we can poulate them in that order.
 123                 //
 124                 // Order is important, because we need to be able to tell, by
 125                 // examining the list of methods of the base class, which ones are virtual
 126                 // or abstract as well as the parent names (to implement new,
 127                 // override).
 128                 //
 129                 static List<TypeContainer> type_container_resolve_order;
 130
 131                 //
 132                 // Holds a reference to the Private Implementation Details
 133                 // class.
 134                 //
 135                 static List<TypeBuilder> helper_classes;
 136
 137                 static TypeBuilder impl_details_class;
 138
 139                 //
 140                 // Constructor
 141                 //
 142                 static RootContext ()
 143                 {
 144                         Reset (true);
 145                 }
 146
 147                 public static void PartialReset ()
 148                 {
 149                         Reset (false);
 150                 }
 151
 152                 public static void Reset (bool full)
 153                 {
 154                         if (full)
 155                                 root = null;
 156
 157                         type_container_resolve_order = new List<TypeContainer> ();
 158                         EntryPoint = null;
 159                         Checked = false;
 160                         Unsafe = false;
 161                         StdLib = true;
 162                         StrongNameKeyFile = null;
 163                         StrongNameKeyContainer = null;
 164                         StrongNameDelaySign = false;
 165                         MainClass = null;
 166                         Target = Target.Exe;
 167                         TargetExt = ".exe";
 168                         Platform = Platform.AnyCPU;
 169                         Version = LanguageVersion.Default;
 170                         Documentation = null;
 171                         impl_details_class = null;
 172                         helper_classes = null;
 173
 174 #if NET_4_0
 175                         MetadataCompatibilityVersion = MetadataVersion.v4;
 176 #else
 177                         MetadataCompatibilityVersion = MetadataVersion.v2;
 178 #endif
 179
 180                         //
 181                         // Setup default defines
 182                         //
 183                         AllDefines = new List<string> ();
 184                         AddConditional ("__MonoCS__");
 185                 }
 186
 187                 public static void AddConditional (string p)
 188                 {
 189                         if (AllDefines.Contains (p))
 190                                 return;
 191                         AllDefines.Add (p);
 192                 }
 193
 194                 public static bool IsConditionalDefined (string value)
 195                 {
 196                         return AllDefines.Contains (value);
 197                 }
 198
 199                 static public ModuleCompiled ToplevelTypes {
 200                         get { return root; }
 201                         set { root = value; }
 202                 }
 203
 204                 public static void RegisterOrder (TypeContainer tc)
 205                 {
 206                         type_container_resolve_order.Add (tc);
 207                 }
 208
 209                 // <remarks>
 210                 //   This function is used to resolve the hierarchy tree.
 211                 //   It processes interfaces, structs and classes in that order.
 212                 //
 213                 //   It creates the TypeBuilder's as it processes the user defined
 214                 //   types.
 215                 // </remarks>
 216                 static public void ResolveTree ()
 217                 {
 218                         root.Resolve ();
 219
 220                         //
 221                         // Interfaces are processed next, as classes and
 222                         // structs might inherit from an object or implement
 223                         // a set of interfaces, we need to be able to tell
 224                         // them appart by just using the TypeManager.
 225                         //
 226                         foreach (TypeContainer tc in root.Types)
 227                                 tc.CreateType ();
 228
 229                         foreach (TypeContainer tc in root.Types)
 230                                 tc.DefineType ();
 231
 232                         if (root.Delegates != null)
 233                                 foreach (Delegate d in root.Delegates)
 234                                         d.DefineType ();
 235                 }
 236
 237                 // <summary>
 238                 //   Closes all open types
 239                 // </summary>
 240                 //
 241                 // <remarks>
 242                 //   We usually use TypeBuilder types.  When we are done
 243                 //   creating the type (which will happen after we have added
 244                 //   methods, fields, etc) we need to "Define" them before we
 245                 //   can save the Assembly
 246                 // </remarks>
 247                 static public void CloseTypes ()
 248                 {
 249                         //
 250                         // We do this in two passes, first we close the structs,
 251                         // then the classes, because it seems the code needs it this
 252                         // way.  If this is really what is going on, we should probably
 253                         // make sure that we define the structs in order as well.
 254                         //
 255                         foreach (TypeContainer tc in type_container_resolve_order){
 256                                 if (tc.Kind == MemberKind.Struct && tc.Parent == root){
 257                                         tc.CloseType ();
 258                                 }
 259                         }
 260
 261                         foreach (TypeContainer tc in type_container_resolve_order){
 262                                 if (!(tc.Kind == MemberKind.Struct && tc.Parent == root))
 263                                         tc.CloseType ();
 264                         }
 265
 266                         if (root.Delegates != null)
 267                                 foreach (Delegate d in root.Delegates)
 268                                         d.CloseType ();
 269
 270
 271                         //
 272                         // If we have a <PrivateImplementationDetails> class, close it
 273                         //
 274                         if (helper_classes != null){
 275                                 foreach (TypeBuilder type_builder in helper_classes) {
 276                                         PredefinedAttributes.Get.CompilerGenerated.EmitAttribute (type_builder);
 277                                         type_builder.CreateType ();
 278                                 }
 279                         }
 280
 281                         type_container_resolve_order = null;
 282                         helper_classes = null;
 283                         //root = null;
 284                         TypeManager.CleanUp ();
 285                 }
 286
 287                 /// <summary>
 288                 ///   Used to register classes that need to be closed after all the
 289                 ///   user defined classes
 290                 /// </summary>
 291                 public static void RegisterCompilerGeneratedType (TypeBuilder helper_class)
 292                 {
 293                         if (helper_classes == null)
 294                                 helper_classes = new List<TypeBuilder> ();
 295
 296                         helper_classes.Add (helper_class);
 297                 }
 298
 299                 static public DeclSpace PopulateCoreType (TypeContainer root, string name)
 300                 {
 301                         DeclSpace ds = (DeclSpace) root.GetDefinition (name);
 302                         // Core type was imported
 303                         if (ds == null)
 304                                 return null;
 305
 306                         ds.Define ();
 307                         return ds;
 308                 }
 309
 310                 static public void BootCorlib_PopulateCoreTypes ()
 311                 {
 312                         // Clear -nostdlib flag when object type is imported
 313                         if (PopulateCoreType (root, "System.Object") == null)
 314                                 RootContext.StdLib = true;
 315
 316                         PopulateCoreType (root, "System.ValueType");
 317                         PopulateCoreType (root, "System.Attribute");
 318                         PopulateCoreType (root, "System.Runtime.CompilerServices.IndexerNameAttribute");
 319                 }
 320
 321                 // <summary>
 322                 //   Populates the structs and classes with fields and methods
 323                 // </summary>
 324                 //
 325                 // This is invoked after all interfaces, structs and classes
 326                 // have been defined through `ResolveTree'
 327                 static public void PopulateTypes ()
 328                 {
 329
 330                         if (type_container_resolve_order != null){
 331                                 foreach (TypeContainer tc in type_container_resolve_order)
 332                                         tc.ResolveType ();
 333                                 foreach (TypeContainer tc in type_container_resolve_order) {
 334                                         try {
 335                                                 tc.Define ();
 336                                         } catch (Exception e) {
 337                                                 throw new InternalErrorException (tc, e);
 338                                         }
 339                                 }
 340                         }
 341
 342                         var delegates = root.Delegates;
 343                         if (delegates != null){
 344                                 foreach (Delegate d in delegates)
 345                                         d.Define ();
 346                         }
 347
 348                         //
 349                         // Check for cycles in the struct layout
 350                         //
 351                         if (type_container_resolve_order != null){
 352                                 var seen = new Dictionary<TypeContainer, object> ();
 353                                 foreach (TypeContainer tc in type_container_resolve_order)
 354                                         TypeManager.CheckStructCycles (tc, seen);
 355                         }
 356                 }
 357
 358                 static public void EmitCode ()
 359                 {
 360                         if (type_container_resolve_order != null) {
 361                                 foreach (TypeContainer tc in type_container_resolve_order)
 362                                         tc.EmitType ();
 363
 364                                 if (ToplevelTypes.Compiler.Report.Errors > 0)
 365                                         return;
 366
 367                                 foreach (TypeContainer tc in type_container_resolve_order)
 368                                         tc.VerifyMembers ();
 369                         }
 370
 371                         if (root.Delegates != null) {
 372                                 foreach (Delegate d in root.Delegates)
 373                                         d.Emit ();
 374                         }
 375
 376                         CodeGen.Assembly.Emit (root);
 377                         root.Emit ();
 378                 }
 379
 380                 //
 381                 // Public Field, used to track which method is the public entry
 382                 // point.
 383                 //
 384                 static public Method EntryPoint;
 385
 386                 //
 387                 // These are used to generate unique names on the structs and fields.
 388                 //
 389                 static int field_count;
 390
 391                 //
 392                 // Makes an initialized struct, returns the field builder that
 393                 // references the data.  Thanks go to Sergey Chaban for researching
 394                 // how to do this.  And coming up with a shorter mechanism than I
 395                 // was able to figure out.
 396                 //
 397                 // This works but makes an implicit public struct $ArrayType$SIZE and
 398                 // makes the fields point to it.  We could get more control if we did
 399                 // use instead:
 400                 //
 401                 // 1. DefineNestedType on the impl_details_class with our struct.
 402                 //
 403                 // 2. Define the field on the impl_details_class
 404                 //
 405                 static public FieldBuilder MakeStaticData (byte [] data)
 406                 {
 407                         FieldBuilder fb;
 408
 409                         if (impl_details_class == null){
 410                                 impl_details_class = ToplevelTypes.Builder.DefineType (
 411                                         "<PrivateImplementationDetails>",
 412                                         TypeAttributes.NotPublic,
 413                                         TypeManager.object_type);
 414
 415                                 RegisterCompilerGeneratedType (impl_details_class);
 416                         }
 417
 418                         fb = impl_details_class.DefineInitializedData (
 419                                 "$$field-" + (field_count++), data,
 420                                 FieldAttributes.Static | FieldAttributes.Assembly);
 421
 422                         return fb;
 423                 }
 424
 425                 public static void CheckUnsafeOption (Location loc, Report Report)
 426                 {
 427                         if (!Unsafe) {
 428                                 Report.Error (227, loc,
 429                                         "Unsafe code requires the `unsafe' command line option to be specified");
 430                         }
 431                 }
 432         }
 433 }