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                 // Holds a reference to the Private Implementation Details
 122                 // class.
 123                 //
 124                 static List<TypeBuilder> helper_classes;
 125
 126                 static TypeBuilder impl_details_class;
 127
 128                 public static List<Enum> hack_corlib_enums = new List<Enum> ();
 129
 130                 //
 131                 // Constructor
 132                 //
 133                 static RootContext ()
 134                 {
 135                         Reset (true);
 136                 }
 137
 138                 public static void PartialReset ()
 139                 {
 140                         Reset (false);
 141                 }
 142
 143                 public static void Reset (bool full)
 144                 {
 145                         impl_details_class = null;
 146                         helper_classes = null;
 147
 148                         if (!full)
 149                                 return;
 150
 151                         EntryPoint = null;
 152                         Checked = false;
 153                         Unsafe = false;
 154                         StdLib = true;
 155                         StrongNameKeyFile = null;
 156                         StrongNameKeyContainer = null;
 157                         StrongNameDelaySign = false;
 158                         MainClass = null;
 159                         Target = Target.Exe;
 160                         TargetExt = ".exe";
 161                         Platform = Platform.AnyCPU;
 162                         Version = LanguageVersion.Default;
 163                         Documentation = null;
 164                         impl_details_class = null;
 165                         helper_classes = null;
 166
 167 #if NET_4_0
 168                         MetadataCompatibilityVersion = MetadataVersion.v4;
 169 #else
 170                         MetadataCompatibilityVersion = MetadataVersion.v2;
 171 #endif
 172
 173                         //
 174                         // Setup default defines
 175                         //
 176                         AllDefines = new List<string> ();
 177                         AddConditional ("__MonoCS__");
 178                 }
 179
 180                 public static void AddConditional (string p)
 181                 {
 182                         if (AllDefines.Contains (p))
 183                                 return;
 184                         AllDefines.Add (p);
 185                 }
 186
 187                 public static bool IsConditionalDefined (string value)
 188                 {
 189                         return AllDefines.Contains (value);
 190                 }
 191
 192                 static public ModuleCompiled ToplevelTypes {
 193                         get { return root; }
 194                         set { root = value; }
 195                 }
 196
 197                 // <remarks>
 198                 //   This function is used to resolve the hierarchy tree.
 199                 //   It processes interfaces, structs and classes in that order.
 200                 //
 201                 //   It creates the TypeBuilder's as it processes the user defined
 202                 //   types.
 203                 // </remarks>
 204                 static public void ResolveTree ()
 205                 {
 206                         root.Resolve ();
 207
 208                         //
 209                         // Interfaces are processed next, as classes and
 210                         // structs might inherit from an object or implement
 211                         // a set of interfaces, we need to be able to tell
 212                         // them appart by just using the TypeManager.
 213                         //
 214                         foreach (TypeContainer tc in root.Types)
 215                                 tc.CreateType ();
 216
 217                         foreach (TypeContainer tc in root.Types)
 218                                 tc.DefineType ();
 219                 }
 220
 221                 static void HackCorlib ()
 222                 {
 223                         if (StdLib)
 224                                 return;
 225
 226                         //
 227                         // HACK: When building corlib mcs uses loaded mscorlib which
 228                         // has different predefined types and this method sets mscorlib types
 229                         // to be same to avoid type check errors in CreateType.
 230                         //
 231                         var type = typeof (Type);
 232                         var system_4_type_arg = new[] { type, type, type, type };
 233
 234                         MethodInfo set_corlib_type_builders =
 235                                 typeof (System.Reflection.Emit.AssemblyBuilder).GetMethod (
 236                                 "SetCorlibTypeBuilders", BindingFlags.NonPublic | BindingFlags.Instance, null,
 237                                 system_4_type_arg, null);
 238
 239                         if (set_corlib_type_builders == null) {
 240                                 root.Compiler.Report.Warning (-26, 3, "The compilation may fail due to missing `{0}.SetCorlibTypeBuilders(...)' method",
 241                                         typeof (System.Reflection.Emit.AssemblyBuilder).FullName);
 242                                 return;
 243                         }
 244
 245                         object[] args = new object[4];
 246                         args[0] = TypeManager.object_type.GetMetaInfo ();
 247                         args[1] = TypeManager.value_type.GetMetaInfo ();
 248                         args[2] = TypeManager.enum_type.GetMetaInfo ();
 249                         args[3] = TypeManager.void_type.GetMetaInfo ();
 250                         set_corlib_type_builders.Invoke (CodeGen.Assembly.Builder, args);
 251
 252                         // Another Mono corlib HACK
 253                         // mono_class_layout_fields requires to have enums created
 254                         // before creating a class which used the enum for any of its fields
 255                         foreach (var e in hack_corlib_enums)
 256                                 e.CloseType ();
 257                 }
 258
 259                 // <summary>
 260                 //   Closes all open types
 261                 // </summary>
 262                 //
 263                 // <remarks>
 264                 //   We usually use TypeBuilder types.  When we are done
 265                 //   creating the type (which will happen after we have added
 266                 //   methods, fields, etc) we need to "Define" them before we
 267                 //   can save the Assembly
 268                 // </remarks>
 269                 static public void CloseTypes ()
 270                 {
 271                         HackCorlib ();
 272
 273                         foreach (TypeContainer tc in root.Types){
 274                                 tc.CloseType ();
 275                         }
 276
 277                         if (root.CompilerGeneratedClasses != null)
 278                                 foreach (CompilerGeneratedClass c in root.CompilerGeneratedClasses)
 279                                         c.CloseType ();
 280
 281                         //
 282                         // If we have a <PrivateImplementationDetails> class, close it
 283                         //
 284                         if (helper_classes != null){
 285                                 foreach (TypeBuilder type_builder in helper_classes) {
 286                                         PredefinedAttributes.Get.CompilerGenerated.EmitAttribute (type_builder);
 287                                         type_builder.CreateType ();
 288                                 }
 289                         }
 290
 291                         helper_classes = null;
 292                 }
 293
 294                 /// <summary>
 295                 ///   Used to register classes that need to be closed after all the
 296                 ///   user defined classes
 297                 /// </summary>
 298                 public static void RegisterCompilerGeneratedType (TypeBuilder helper_class)
 299                 {
 300                         if (helper_classes == null)
 301                                 helper_classes = new List<TypeBuilder> ();
 302
 303                         helper_classes.Add (helper_class);
 304                 }
 305
 306                 // <summary>
 307                 //   Populates the structs and classes with fields and methods
 308                 // </summary>
 309                 //
 310                 // This is invoked after all interfaces, structs and classes
 311                 // have been defined through `ResolveTree'
 312                 static public void PopulateTypes ()
 313                 {
 314                         foreach (TypeContainer tc in ToplevelTypes.Types)
 315                                 tc.ResolveTypeParameters ();
 316
 317                         foreach (TypeContainer tc in ToplevelTypes.Types) {
 318                                 try {
 319                                         tc.Define ();
 320                                 } catch (Exception e) {
 321                                         throw new InternalErrorException (tc, e);
 322                                 }
 323                         }
 324                 }
 325
 326                 static public void EmitCode ()
 327                 {
 328                         foreach (var tc in ToplevelTypes.Types)
 329                                 tc.DefineConstants ();
 330
 331                         foreach (TypeContainer tc in ToplevelTypes.Types)
 332                                 tc.EmitType ();
 333
 334                         if (ToplevelTypes.Compiler.Report.Errors > 0)
 335                                 return;
 336
 337                         foreach (TypeContainer tc in ToplevelTypes.Types)
 338                                 tc.VerifyMembers ();
 339
 340                         if (root.CompilerGeneratedClasses != null)
 341                                 foreach (CompilerGeneratedClass c in root.CompilerGeneratedClasses)
 342                                         c.EmitType ();
 343
 344                         CodeGen.Assembly.Emit (root);
 345                         root.Emit ();
 346                 }
 347
 348                 //
 349                 // Public Field, used to track which method is the public entry
 350                 // point.
 351                 //
 352                 static public Method EntryPoint;
 353
 354                 //
 355                 // These are used to generate unique names on the structs and fields.
 356                 //
 357                 static int field_count;
 358
 359                 //
 360                 // Makes an initialized struct, returns the field builder that
 361                 // references the data.  Thanks go to Sergey Chaban for researching
 362                 // how to do this.  And coming up with a shorter mechanism than I
 363                 // was able to figure out.
 364                 //
 365                 // This works but makes an implicit public struct $ArrayType$SIZE and
 366                 // makes the fields point to it.  We could get more control if we did
 367                 // use instead:
 368                 //
 369                 // 1. DefineNestedType on the impl_details_class with our struct.
 370                 //
 371                 // 2. Define the field on the impl_details_class
 372                 //
 373                 static public FieldBuilder MakeStaticData (byte [] data)
 374                 {
 375                         FieldBuilder fb;
 376
 377                         if (impl_details_class == null){
 378                                 impl_details_class = ToplevelTypes.Builder.DefineType (
 379                                         "<PrivateImplementationDetails>",
 380                                         TypeAttributes.NotPublic,
 381                                         TypeManager.object_type.GetMetaInfo ());
 382
 383                                 RegisterCompilerGeneratedType (impl_details_class);
 384                         }
 385
 386                         fb = impl_details_class.DefineInitializedData (
 387                                 "$$field-" + (field_count++), data,
 388                                 FieldAttributes.Static | FieldAttributes.Assembly);
 389
 390                         return fb;
 391                 }
 392
 393                 public static void CheckUnsafeOption (Location loc, Report Report)
 394                 {
 395                         if (!Unsafe) {
 396                                 Report.Error (227, loc,
 397                                         "Unsafe code requires the `unsafe' command line option to be specified");
 398                         }
 399                 }
 400         }
 401 }