mcs/gmcs/codegen.cs

   1 //
   2 // codegen.cs: The code generator
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //
   7 // (C) 2001, 2002, 2003 Ximian, Inc.
   8 // (C) 2004 Novell, Inc.
   9 //
  10
  11 #if !DEBUG
  12         #define PRODUCTION
  13 #endif
  14
  15 using System;
  16 using System.IO;
  17 using System.Collections;
  18 using System.Collections.Specialized;
  19 using System.Reflection;
  20 using System.Reflection.Emit;
  21 using System.Runtime.InteropServices;
  22 using System.Security;
  23 using System.Security.Cryptography;
  24 using System.Security.Permissions;
  25
  26 using Mono.Security.Cryptography;
  27
  28 namespace Mono.CSharp {
  29
  30         /// <summary>
  31         ///    Code generator class.
  32         /// </summary>
  33         public class CodeGen {
  34                 static AppDomain current_domain;
  35                 static public SymbolWriter SymbolWriter;
  36
  37                 public static AssemblyClass Assembly;
  38                 public static ModuleClass Module;
  39
  40                 static CodeGen ()
  41                 {
  42                         Reset ();
  43                 }
  44
  45                 public static void Reset ()
  46                 {
  47                         Assembly = new AssemblyClass ();
  48                         Module = new ModuleClass (RootContext.Unsafe);
  49                 }
  50
  51                 public static string Basename (string name)
  52                 {
  53                         int pos = name.LastIndexOf ('/');
  54
  55                         if (pos != -1)
  56                                 return name.Substring (pos + 1);
  57
  58                         pos = name.LastIndexOf ('\\');
  59                         if (pos != -1)
  60                                 return name.Substring (pos + 1);
  61
  62                         return name;
  63                 }
  64
  65                 public static string Dirname (string name)
  66                 {
  67                         int pos = name.LastIndexOf ('/');
  68
  69                         if (pos != -1)
  70                                 return name.Substring (0, pos);
  71
  72                         pos = name.LastIndexOf ('\\');
  73                         if (pos != -1)
  74                                 return name.Substring (0, pos);
  75
  76                         return ".";
  77                 }
  78
  79                 static public string FileName;
  80
  81                 //
  82                 // Initializes the symbol writer
  83                 //
  84                 static void InitializeSymbolWriter (string filename)
  85                 {
  86                         SymbolWriter = SymbolWriter.GetSymbolWriter (Module.Builder, filename);
  87
  88                         //
  89                         // If we got an ISymbolWriter instance, initialize it.
  90                         //
  91                         if (SymbolWriter == null) {
  92                                 Report.Warning (
  93                                         -18, 1, "Could not find the symbol writer assembly (Mono.CompilerServices.SymbolWriter.dll). This is normally an installation problem. Please make sure to compile and install the mcs/class/Mono.CompilerServices.SymbolWriter directory.");
  94                                 return;
  95                         }
  96                 }
  97
  98                 //
  99                 // Initializes the code generator variables
 100                 //
 101                 static public bool Init (string name, string output, bool want_debugging_support)
 102                 {
 103                         FileName = output;
 104                         AssemblyName an = Assembly.GetAssemblyName (name, output);
 105                         if (an == null)
 106                                 return false;
 107
 108                         if (an.KeyPair != null) {
 109                                 // If we are going to strong name our assembly make
 110                                 // sure all its refs are strong named
 111                                 foreach (Assembly a in RootNamespace.Global.Assemblies) {
 112                                         AssemblyName ref_name = a.GetName ();
 113                                         byte [] b = ref_name.GetPublicKeyToken ();
 114                                         if (b == null || b.Length == 0) {
 115                                                 Report.Error (1577, "Assembly generation failed " +
 116                                                                 "-- Referenced assembly '" +
 117                                                                 ref_name.Name +
 118                                                                 "' does not have a strong name.");
 119                                                 //Environment.Exit (1);
 120                                         }
 121                                 }
 122                         }
 123
 124                         current_domain = AppDomain.CurrentDomain;
 125
 126                         try {
 127                                 Assembly.Builder = current_domain.DefineDynamicAssembly (an,
 128                                         AssemblyBuilderAccess.Save, Dirname (name));
 129                         }
 130                         catch (ArgumentException) {
 131                                 // specified key may not be exportable outside it's container
 132                                 if (RootContext.StrongNameKeyContainer != null) {
 133                                         Report.Error (1548, "Could not access the key inside the container `" +
 134                                                 RootContext.StrongNameKeyContainer + "'.");
 135                                         Environment.Exit (1);
 136                                 }
 137                                 return false;
 138                         }
 139                         catch (CryptographicException) {
 140                                 if ((RootContext.StrongNameKeyContainer != null) || (RootContext.StrongNameKeyFile != null)) {
 141                                         Report.Error (1548, "Could not use the specified key to strongname the assembly.");
 142                                         Environment.Exit (1);
 143                                 }
 144                                 return false;
 145                         }
 146
 147                         // Get the complete AssemblyName from the builder
 148                         // (We need to get the public key and token)
 149                         Assembly.Name = Assembly.Builder.GetName ();
 150
 151                         //
 152                         // Pass a path-less name to DefineDynamicModule.  Wonder how
 153                         // this copes with output in different directories then.
 154                         // FIXME: figure out how this copes with --output /tmp/blah
 155                         //
 156                         // If the third argument is true, the ModuleBuilder will dynamically
 157                         // load the default symbol writer.
 158                         //
 159                         Module.Builder = Assembly.Builder.DefineDynamicModule (
 160                                 Basename (name), Basename (output), false);
 161
 162                         if (want_debugging_support)
 163                                 InitializeSymbolWriter (output);
 164
 165                         return true;
 166                 }
 167
 168                 static public void Save (string name)
 169                 {
 170                         try {
 171                                 Assembly.Builder.Save (Basename (name));
 172
 173                                 if (SymbolWriter != null)
 174                                         SymbolWriter.WriteSymbolFile ();
 175                         }
 176                         catch (COMException) {
 177                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 178                                         throw;
 179
 180                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 181                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 182                                         RootContext.StrongNameKeyFile +
 183                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 184                         }
 185                         catch (System.IO.IOException io) {
 186                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 187                         }
 188                         catch (System.UnauthorizedAccessException ua) {
 189                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + ua.Message);
 190                         }
 191                 }
 192         }
 193
 194
 195         public interface IResolveContext
 196         {
 197                 DeclSpace DeclContainer { get; }
 198                 bool IsInObsoleteScope { get; }
 199                 bool IsInUnsafeScope { get; }
 200
 201                 // the declcontainer to lookup for type-parameters.  Should only use LookupGeneric on it.
 202                 //
 203                 // FIXME: This is somewhat of a hack.  We don't need a full DeclSpace for this.  We just need the
 204                 //        current type parameters in scope. IUIC, that will require us to rewrite GenericMethod.
 205                 //        Maybe we can replace this with a 'LookupGeneric (string)' instead, but we'll have to
 206                 //        handle generic method overrides differently
 207                 DeclSpace GenericDeclContainer { get; }
 208         }
 209
 210         /// <summary>
 211         ///   An Emit Context is created for each body of code (from methods,
 212         ///   properties bodies, indexer bodies or constructor bodies)
 213         /// </summary>
 214         public class EmitContext : IResolveContext {
 215
 216                 DeclSpace declSpace;
 217                 public DeclSpace TypeContainer;
 218                 public ILGenerator   ig;
 219
 220                 [Flags]
 221                 public enum Flags : byte {
 222                         /// <summary>
 223                         ///   This flag tracks the `checked' state of the compilation,
 224                         ///   it controls whether we should generate code that does overflow
 225                         ///   checking, or if we generate code that ignores overflows.
 226                         ///
 227                         ///   The default setting comes from the command line option to generate
 228                         ///   checked or unchecked code plus any source code changes using the
 229                         ///   checked/unchecked statements or expressions.   Contrast this with
 230                         ///   the ConstantCheckState flag.
 231                         /// </summary>
 232                         CheckState = 1 << 0,
 233
 234                         /// <summary>
 235                         ///   The constant check state is always set to `true' and cant be changed
 236                         ///   from the command line.  The source code can change this setting with
 237                         ///   the `checked' and `unchecked' statements and expressions.
 238                         /// </summary>
 239                         ConstantCheckState = 1 << 1,
 240
 241                         AllCheckStateFlags = CheckState | ConstantCheckState,
 242
 243                         /// <summary>
 244                         ///  Whether we are inside an unsafe block
 245                         /// </summary>
 246                         InUnsafe = 1 << 2,
 247
 248                         InCatch = 1 << 3,
 249                         InFinally = 1 << 4,
 250
 251                         /// <summary>
 252                         ///   Whether control flow analysis is enabled
 253                         /// </summary>
 254                         DoFlowAnalysis = 1 << 5,
 255
 256                         /// <summary>
 257                         ///   Whether control flow analysis is disabled on structs
 258                         ///   (only meaningful when DoFlowAnalysis is set)
 259                         /// </summary>
 260                         OmitStructFlowAnalysis = 1 << 6
 261                 }
 262
 263                 Flags flags;
 264
 265                 /// <summary>
 266                 ///   Whether we are emitting code inside a static or instance method
 267                 /// </summary>
 268                 public bool IsStatic;
 269
 270                 /// <summary>
 271                 ///   Whether the actual created method is static or instance method.
 272                 ///   Althoug the method might be declared as `static', if an anonymous
 273                 ///   method is involved, we might turn this into an instance method.
 274                 ///
 275                 ///   So this reflects the low-level staticness of the method, while
 276                 ///   IsStatic represents the semantic, high-level staticness.
 277                 /// </summary>
 278                 public bool MethodIsStatic;
 279
 280                 /// <summary>
 281                 ///   Whether we are emitting a field initializer
 282                 /// </summary>
 283                 public bool IsFieldInitializer;
 284
 285                 /// <summary>
 286                 ///   The value that is allowed to be returned or NULL if there is no
 287                 ///   return type.
 288                 /// </summary>
 289                 public Type ReturnType;
 290
 291                 /// <summary>
 292                 ///   Points to the Type (extracted from the TypeContainer) that
 293                 ///   declares this body of code
 294                 /// </summary>
 295                 public Type ContainerType;
 296
 297                 /// <summary>
 298                 ///   Whether this is generating code for a constructor
 299                 /// </summary>
 300                 public bool IsConstructor;
 301
 302                 /// <summary>
 303                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 304                 ///   to store structures (used to compute the address of the structure
 305                 ///   value on structure method invocations)
 306                 /// </summary>
 307                 public Hashtable temporary_storage;
 308
 309                 public Block CurrentBlock;
 310
 311                 public int CurrentFile;
 312
 313                 /// <summary>
 314                 ///   The location where we store the return value.
 315                 /// </summary>
 316                 LocalBuilder return_value;
 317
 318                 /// <summary>
 319                 ///   The location where return has to jump to return the
 320                 ///   value
 321                 /// </summary>
 322                 public Label ReturnLabel;
 323
 324                 /// <summary>
 325                 ///   If we already defined the ReturnLabel
 326                 /// </summary>
 327                 public bool HasReturnLabel;
 328
 329                 /// <summary>
 330                 ///   Whether we are inside an iterator block.
 331                 /// </summary>
 332                 public bool InIterator;
 333
 334                 public bool IsLastStatement;
 335
 336                 /// <summary>
 337                 ///  Whether we are in a `fixed' initialization
 338                 /// </summary>
 339                 public bool InFixedInitializer;
 340
 341                 /// <summary>
 342                 ///  Whether we are inside an anonymous method.
 343                 /// </summary>
 344                 public AnonymousContainer CurrentAnonymousMethod;
 345
 346                 /// <summary>
 347                 ///   Location for this EmitContext
 348                 /// </summary>
 349                 public Location loc;
 350
 351                 /// <summary>
 352                 ///   Inside an enum definition, we do not resolve enumeration values
 353                 ///   to their enumerations, but rather to the underlying type/value
 354                 ///   This is so EnumVal + EnumValB can be evaluated.
 355                 ///
 356                 ///   There is no "E operator + (E x, E y)", so during an enum evaluation
 357                 ///   we relax the rules
 358                 /// </summary>
 359                 public bool InEnumContext;
 360
 361                 /// <summary>
 362                 ///   Anonymous methods can capture local variables and fields,
 363                 ///   this object tracks it.  It is copied from the TopLevelBlock
 364                 ///   field.
 365                 /// </summary>
 366                 public CaptureContext capture_context;
 367
 368                 public readonly IResolveContext ResolveContext;
 369
 370                 /// <summary>
 371                 ///    The current iterator
 372                 /// </summary>
 373                 public Iterator CurrentIterator {
 374                         get {
 375                                 if (CurrentAnonymousMethod != null)
 376                                         return CurrentAnonymousMethod.Iterator;
 377                                 else
 378                                         return null;
 379                         }
 380                 }
 381
 382                 /// <summary>
 383                 ///    Whether we are in the resolving stage or not
 384                 /// </summary>
 385                 enum Phase {
 386                         Created,
 387                         Resolving,
 388                         Emitting
 389                 }
 390
 391                 bool isAnonymousMethodAllowed = true;
 392
 393                 Phase current_phase;
 394                 FlowBranching current_flow_branching;
 395
 396                 static int next_id = 0;
 397                 int id = ++next_id;
 398
 399                 public override string ToString ()
 400                 {
 401                         return String.Format ("EmitContext ({0}:{1}:{2})", id,
 402                                               CurrentIterator, capture_context, loc);
 403                 }
 404
 405                 public EmitContext (IResolveContext rc, DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 406                                     Type return_type, int code_flags, bool is_constructor)
 407                 {
 408                         this.ResolveContext = rc;
 409                         this.ig = ig;
 410
 411                         TypeContainer = parent;
 412                         this.declSpace = ds;
 413                         if (RootContext.Checked)
 414                                 flags |= Flags.CheckState;
 415                         flags |= Flags.ConstantCheckState;
 416
 417                         if ((return_type is TypeBuilder) && return_type.IsGenericTypeDefinition)
 418                                 throw new InternalErrorException ();
 419
 420                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 421                         MethodIsStatic = IsStatic;
 422                         InIterator = (code_flags & Modifiers.METHOD_YIELDS) != 0;
 423                         ReturnType = return_type;
 424                         IsConstructor = is_constructor;
 425                         CurrentBlock = null;
 426                         CurrentFile = 0;
 427                         current_phase = Phase.Created;
 428
 429                         if (parent != null){
 430                                 // Can only be null for the ResolveType contexts.
 431                                 ContainerType = parent.TypeBuilder;
 432                                 if (rc.IsInUnsafeScope)
 433                                         flags |= Flags.InUnsafe;
 434                         }
 435                         loc = l;
 436
 437                         if (ReturnType == TypeManager.void_type)
 438                                 ReturnType = null;
 439                 }
 440
 441                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 442                                     Type return_type, int code_flags, bool is_constructor)
 443                         : this (rc, ds, ds, l, ig, return_type, code_flags, is_constructor)
 444                 {
 445                 }
 446
 447                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 448                                     Type return_type, int code_flags)
 449                         : this (rc, ds, ds, l, ig, return_type, code_flags, false)
 450                 {
 451                 }
 452
 453                 public DeclSpace DeclContainer {
 454                         get { return declSpace; }
 455                         set { declSpace = value; }
 456                 }
 457
 458                 public DeclSpace GenericDeclContainer {
 459                         get { return DeclContainer; }
 460                 }
 461
 462                 public bool CheckState {
 463                         get { return (flags & Flags.CheckState) != 0; }
 464                 }
 465
 466                 public bool ConstantCheckState {
 467                         get { return (flags & Flags.ConstantCheckState) != 0; }
 468                 }
 469
 470                 public bool InUnsafe {
 471                         get { return (flags & Flags.InUnsafe) != 0; }
 472                 }
 473
 474                 public bool InCatch {
 475                         get { return (flags & Flags.InCatch) != 0; }
 476                 }
 477
 478                 public bool InFinally {
 479                         get { return (flags & Flags.InFinally) != 0; }
 480                 }
 481
 482                 public bool DoFlowAnalysis {
 483                         get { return (flags & Flags.DoFlowAnalysis) != 0; }
 484                 }
 485
 486                 public bool OmitStructFlowAnalysis {
 487                         get { return (flags & Flags.OmitStructFlowAnalysis) != 0; }
 488                 }
 489
 490                 // utility helper for CheckExpr, UnCheckExpr, Checked and Unchecked statements
 491                 // it's public so that we can use a struct at the callsite
 492                 public struct FlagsHandle : IDisposable
 493                 {
 494                         EmitContext ec;
 495                         Flags invmask, oldval;
 496                         internal FlagsHandle (EmitContext ec, Flags mask, Flags val)
 497                         {
 498                                 this.ec = ec;
 499                                 invmask = ~mask;
 500                                 oldval = ec.flags & mask;
 501                                 ec.flags = (ec.flags & invmask) | (val & mask);
 502                         }
 503                         public void Dispose ()
 504                         {
 505                                 ec.flags = (ec.flags & invmask) | oldval;
 506                         }
 507                 }
 508
 509                 // Temporarily set all the given flags to the given value.  Should be used in an 'using' statement
 510                 public FlagsHandle With (Flags bits, bool enable)
 511                 {
 512                         return new FlagsHandle (this, bits, enable ? bits : 0);
 513                 }
 514
 515                 public FlagsHandle WithFlowAnalysis (bool do_flow_analysis, bool omit_struct_analysis)
 516                 {
 517                         Flags newflags =
 518                                 (do_flow_analysis ? Flags.DoFlowAnalysis : 0) |
 519                                 (omit_struct_analysis ? Flags.OmitStructFlowAnalysis : 0);
 520                         return new FlagsHandle (this, Flags.DoFlowAnalysis | Flags.OmitStructFlowAnalysis, newflags);
 521                 }
 522
 523                 public bool IsInObsoleteScope {
 524                         get { return ResolveContext.IsInObsoleteScope; }
 525                 }
 526
 527                 public bool IsInUnsafeScope {
 528                         get { return InUnsafe || ResolveContext.IsInUnsafeScope; }
 529                 }
 530
 531                 public bool IsAnonymousMethodAllowed {
 532                         get { return isAnonymousMethodAllowed; }
 533                         set { isAnonymousMethodAllowed = value; }
 534                 }
 535
 536                 public FlowBranching CurrentBranching {
 537                         get { return current_flow_branching; }
 538                 }
 539
 540                 public bool HaveCaptureInfo {
 541                         get { return capture_context != null; }
 542                 }
 543
 544                 public void EmitScopeInitFromBlock (Block b)
 545                 {
 546                         if (capture_context != null)
 547                                 capture_context.EmitScopeInitFromBlock (this, b);
 548                 }
 549
 550                 // <summary>
 551                 //   Starts a new code branching.  This inherits the state of all local
 552                 //   variables and parameters from the current branching.
 553                 // </summary>
 554                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 555                 {
 556                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 557                         return current_flow_branching;
 558                 }
 559
 560                 // <summary>
 561                 //   Starts a new code branching for block `block'.
 562                 // </summary>
 563                 public FlowBranching StartFlowBranching (Block block)
 564                 {
 565                         FlowBranching.BranchingType type;
 566
 567                         if ((CurrentBranching != null) &&
 568                             (CurrentBranching.Type == FlowBranching.BranchingType.Switch))
 569                                 type = FlowBranching.BranchingType.SwitchSection;
 570                         else
 571                                 type = FlowBranching.BranchingType.Block;
 572
 573                         flags |= Flags.DoFlowAnalysis;
 574
 575                         current_flow_branching = FlowBranching.CreateBranching (
 576                                 CurrentBranching, type, block, block.StartLocation);
 577                         return current_flow_branching;
 578                 }
 579
 580                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 581                 {
 582                         FlowBranchingException branching = new FlowBranchingException (CurrentBranching, stmt);
 583                         current_flow_branching = branching;
 584                         return branching;
 585                 }
 586
 587                 public FlowBranchingLabeled StartFlowBranching (LabeledStatement stmt)
 588                 {
 589                         FlowBranchingLabeled branching = new FlowBranchingLabeled (CurrentBranching, stmt);
 590                         current_flow_branching = branching;
 591                         return branching;
 592                 }
 593
 594                 public FlowBranchingToplevel StartFlowBranching (ToplevelBlock stmt)
 595                 {
 596                         FlowBranchingToplevel branching = new FlowBranchingToplevel (CurrentBranching, stmt);
 597                         current_flow_branching = branching;
 598                         return branching;
 599                 }
 600
 601                 // <summary>
 602                 //   Ends a code branching.  Merges the state of locals and parameters
 603                 //   from all the children of the ending branching.
 604                 // </summary>
 605                 public FlowBranching.UsageVector DoEndFlowBranching ()
 606                 {
 607                         FlowBranching old = current_flow_branching;
 608                         current_flow_branching = current_flow_branching.Parent;
 609
 610                         return current_flow_branching.MergeChild (old);
 611                 }
 612
 613                 // <summary>
 614                 //   Ends a code branching.  Merges the state of locals and parameters
 615                 //   from all the children of the ending branching.
 616                 // </summary>
 617                 public FlowBranching.Reachability EndFlowBranching ()
 618                 {
 619                         FlowBranching.UsageVector vector = DoEndFlowBranching ();
 620
 621                         return vector.Reachability;
 622                 }
 623
 624                 // <summary>
 625                 //   Kills the current code branching.  This throws away any changed state
 626                 //   information and should only be used in case of an error.
 627                 // </summary>
 628                 public void KillFlowBranching ()
 629                 {
 630                         current_flow_branching = current_flow_branching.Parent;
 631                 }
 632
 633                 public void CaptureVariable (LocalInfo li)
 634                 {
 635                         capture_context.AddLocal (CurrentAnonymousMethod, li);
 636                         li.IsCaptured = true;
 637                 }
 638
 639                 public void CaptureParameter (string name, Type t, int idx)
 640                 {
 641                         capture_context.AddParameter (this, CurrentAnonymousMethod, name, t, idx);
 642                 }
 643
 644                 public void CaptureThis ()
 645                 {
 646                         capture_context.CaptureThis (CurrentAnonymousMethod);
 647                 }
 648
 649
 650                 //
 651                 // Use to register a field as captured
 652                 //
 653                 public void CaptureField (FieldExpr fe)
 654                 {
 655                         capture_context.AddField (this, CurrentAnonymousMethod, fe);
 656                 }
 657
 658                 //
 659                 // Whether anonymous methods have captured variables
 660                 //
 661                 public bool HaveCapturedVariables ()
 662                 {
 663                         if (capture_context != null)
 664                                 return capture_context.HaveCapturedVariables;
 665                         return false;
 666                 }
 667
 668                 //
 669                 // Whether anonymous methods have captured fields or this.
 670                 //
 671                 public bool HaveCapturedFields ()
 672                 {
 673                         if (capture_context != null)
 674                                 return capture_context.HaveCapturedFields;
 675                         return false;
 676                 }
 677
 678                 //
 679                 // Emits the instance pointer for the host method
 680                 //
 681                 public void EmitMethodHostInstance (EmitContext target, AnonymousMethod am)
 682                 {
 683                         if (capture_context != null)
 684                                 capture_context.EmitMethodHostInstance (target, am);
 685                         else if (IsStatic)
 686                                 target.ig.Emit (OpCodes.Ldnull);
 687                         else
 688                                 target.ig.Emit (OpCodes.Ldarg_0);
 689                 }
 690
 691                 //
 692                 // Returns whether the `local' variable has been captured by an anonymous
 693                 // method
 694                 //
 695                 public bool IsCaptured (LocalInfo local)
 696                 {
 697                         return capture_context.IsCaptured (local);
 698                 }
 699
 700                 public bool IsParameterCaptured (string name)
 701                 {
 702                         if (capture_context != null)
 703                                 return capture_context.IsParameterCaptured (name);
 704                         return false;
 705                 }
 706
 707                 public void EmitMeta (ToplevelBlock b)
 708                 {
 709                         if (capture_context != null)
 710                                 capture_context.EmitAnonymousHelperClasses (this);
 711                         b.EmitMeta (this);
 712
 713                         if (HasReturnLabel)
 714                                 ReturnLabel = ig.DefineLabel ();
 715                 }
 716
 717                 //
 718                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 719                 // currently can not cope with ig == null during resolve (which must
 720                 // be fixed for switch statements to work on anonymous methods).
 721                 //
 722                 public void EmitTopBlock (IMethodData md, ToplevelBlock block)
 723                 {
 724                         if (block == null)
 725                                 return;
 726
 727                         bool unreachable;
 728
 729                         if (ResolveTopBlock (null, block, md.ParameterInfo, md, out unreachable)){
 730                                 EmitMeta (block);
 731
 732                                 current_phase = Phase.Emitting;
 733                                 EmitResolvedTopBlock (block, unreachable);
 734                         }
 735                 }
 736
 737                 bool resolved;
 738
 739                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 740                                              Parameters ip, IMethodData md, out bool unreachable)
 741                 {
 742                         current_phase = Phase.Resolving;
 743
 744                         unreachable = false;
 745
 746                         if (resolved)
 747                                 return true;
 748
 749                         capture_context = block.CaptureContext;
 750
 751                         if (!loc.IsNull)
 752                                 CurrentFile = loc.File;
 753
 754 #if PRODUCTION
 755                         try {
 756 #endif
 757                                 if (!block.ResolveMeta (this, ip))
 758                                         return false;
 759
 760                                 using (this.With (EmitContext.Flags.DoFlowAnalysis, true)) {
 761                                         FlowBranchingToplevel top_level;
 762                                         if (anonymous_method_host != null)
 763                                                 top_level = new FlowBranchingToplevel (anonymous_method_host.CurrentBranching, block);
 764                                         else
 765                                                 top_level = block.TopLevelBranching;
 766
 767                                         current_flow_branching = top_level;
 768                                         bool ok = block.Resolve (this);
 769                                         current_flow_branching = null;
 770
 771                                         if (!ok)
 772                                                 return false;
 773
 774                                         FlowBranching.Reachability reachability = top_level.End ();
 775                                         if (reachability.IsUnreachable)
 776                                                 unreachable = true;
 777                                 }
 778 #if PRODUCTION
 779                         } catch (Exception e) {
 780                                 Console.WriteLine ("Exception caught by the compiler while compiling:");
 781                                 Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 782
 783                                 if (CurrentBlock != null){
 784                                         Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 785                                                            CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 786                                 }
 787                                 Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 788                                 throw;
 789                         }
 790 #endif
 791
 792                         if (ReturnType != null && !unreachable) {
 793                                 if (CurrentAnonymousMethod == null) {
 794                                         Report.Error (161, md.Location, "`{0}': not all code paths return a value", md.GetSignatureForError ());
 795                                         return false;
 796                                 } else if (!CurrentAnonymousMethod.IsIterator) {
 797                                         Report.Error (1643, CurrentAnonymousMethod.Location, "Not all code paths return a value in anonymous method of type `{0}'",
 798                                                 CurrentAnonymousMethod.GetSignatureForError ());
 799                                         return false;
 800                                 }
 801                         }
 802
 803                         block.CompleteContexts ();
 804                         resolved = true;
 805                         return true;
 806                 }
 807
 808                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 809                 {
 810                         if (block != null)
 811                                 block.Emit (this);
 812
 813                         if (HasReturnLabel)
 814                                 ig.MarkLabel (ReturnLabel);
 815
 816                         if (return_value != null){
 817                                 ig.Emit (OpCodes.Ldloc, return_value);
 818                                 ig.Emit (OpCodes.Ret);
 819                         } else {
 820                                 //
 821                                 // If `HasReturnLabel' is set, then we already emitted a
 822                                 // jump to the end of the method, so we must emit a `ret'
 823                                 // there.
 824                                 //
 825                                 // Unfortunately, System.Reflection.Emit automatically emits
 826                                 // a leave to the end of a finally block.  This is a problem
 827                                 // if no code is following the try/finally block since we may
 828                                 // jump to a point after the end of the method.
 829                                 // As a workaround, we're always creating a return label in
 830                                 // this case.
 831                                 //
 832
 833                                 bool in_iterator = (CurrentAnonymousMethod != null) &&
 834                                         CurrentAnonymousMethod.IsIterator && InIterator;
 835
 836                                 if ((block != null) && block.IsDestructor) {
 837                                         // Nothing to do; S.R.E automatically emits a leave.
 838                                 } else if (HasReturnLabel || (!unreachable && !in_iterator)) {
 839                                         if (ReturnType != null)
 840                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 841                                         ig.Emit (OpCodes.Ret);
 842                                 }
 843                         }
 844
 845                         //
 846                         // Close pending helper classes if we are the toplevel
 847                         //
 848                         if (capture_context != null && capture_context.ParentToplevel == null)
 849                                 capture_context.CloseAnonymousHelperClasses ();
 850                 }
 851
 852                 /// <summary>
 853                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 854                 ///   writer to which source line this opcode belongs.
 855                 /// </summary>
 856                 public void Mark (Location loc, bool check_file)
 857                 {
 858                         if ((CodeGen.SymbolWriter == null) || loc.IsNull)
 859                                 return;
 860
 861                         if (check_file && (CurrentFile != loc.File))
 862                                 return;
 863
 864                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, loc.Column);
 865                 }
 866
 867                 public void DefineLocalVariable (string name, LocalBuilder builder)
 868                 {
 869                         if (CodeGen.SymbolWriter == null)
 870                                 return;
 871
 872                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 873                 }
 874
 875                 public void BeginScope ()
 876                 {
 877                         ig.BeginScope();
 878
 879                         if (CodeGen.SymbolWriter != null)
 880                                 CodeGen.SymbolWriter.OpenScope(ig);
 881                 }
 882
 883                 public void EndScope ()
 884                 {
 885                         ig.EndScope();
 886
 887                         if (CodeGen.SymbolWriter != null)
 888                                 CodeGen.SymbolWriter.CloseScope(ig);
 889                 }
 890
 891                 /// <summary>
 892                 ///   Returns a temporary storage for a variable of type t as
 893                 ///   a local variable in the current body.
 894                 /// </summary>
 895                 public LocalBuilder GetTemporaryLocal (Type t)
 896                 {
 897                         if (temporary_storage != null) {
 898                                 object o = temporary_storage [t];
 899                                 if (o != null) {
 900                                         if (o is Stack) {
 901                                                 Stack s = (Stack) o;
 902                                                 o = s.Count == 0 ? null : s.Pop ();
 903                                         } else {
 904                                                 temporary_storage.Remove (t);
 905                                         }
 906                                 }
 907                                 if (o != null)
 908                                         return (LocalBuilder) o;
 909                         }
 910                         return ig.DeclareLocal (t);
 911                 }
 912
 913                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 914                 {
 915                         Stack s;
 916
 917                         if (temporary_storage == null) {
 918                                 temporary_storage = new Hashtable ();
 919                                 temporary_storage [t] = b;
 920                                 return;
 921                         }
 922                         object o = temporary_storage [t];
 923                         if (o == null) {
 924                                 temporary_storage [t] = b;
 925                                 return;
 926                         }
 927                         if (o is Stack) {
 928                                 s = (Stack) o;
 929                         } else {
 930                                 s = new Stack ();
 931                                 s.Push (o);
 932                                 temporary_storage [t] = s;
 933                         }
 934                         s.Push (b);
 935                 }
 936
 937                 /// <summary>
 938                 ///   Current loop begin and end labels.
 939                 /// </summary>
 940                 public Label LoopBegin, LoopEnd;
 941
 942                 /// <summary>
 943                 ///   Default target in a switch statement.   Only valid if
 944                 ///   InSwitch is true
 945                 /// </summary>
 946                 public Label DefaultTarget;
 947
 948                 /// <summary>
 949                 ///   If this is non-null, points to the current switch statement
 950                 /// </summary>
 951                 public Switch Switch;
 952
 953                 /// <summary>
 954                 ///   ReturnValue creates on demand the LocalBuilder for the
 955                 ///   return value from the function.  By default this is not
 956                 ///   used.  This is only required when returns are found inside
 957                 ///   Try or Catch statements.
 958                 ///
 959                 ///   This method is typically invoked from the Emit phase, so
 960                 ///   we allow the creation of a return label if it was not
 961                 ///   requested during the resolution phase.   Could be cleaned
 962                 ///   up, but it would replicate a lot of logic in the Emit phase
 963                 ///   of the code that uses it.
 964                 /// </summary>
 965                 public LocalBuilder TemporaryReturn ()
 966                 {
 967                         if (return_value == null){
 968                                 return_value = ig.DeclareLocal (ReturnType);
 969                                 if (!HasReturnLabel){
 970                                         ReturnLabel = ig.DefineLabel ();
 971                                         HasReturnLabel = true;
 972                                 }
 973                         }
 974
 975                         return return_value;
 976                 }
 977
 978                 /// <summary>
 979                 ///   This method is used during the Resolution phase to flag the
 980                 ///   need to define the ReturnLabel
 981                 /// </summary>
 982                 public void NeedReturnLabel ()
 983                 {
 984                         if (current_phase != Phase.Resolving){
 985                                 //
 986                                 // The reason is that the `ReturnLabel' is declared between
 987                                 // resolution and emission
 988                                 //
 989                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 990                         }
 991
 992                         if (!InIterator && !HasReturnLabel)
 993                                 HasReturnLabel = true;
 994                 }
 995
 996                 //
 997                 // Emits the proper object to address fields on a remapped
 998                 // variable/parameter to field in anonymous-method/iterator proxy classes.
 999                 //
1000                 public void EmitThis (bool need_address)
1001                 {
1002                         ig.Emit (OpCodes.Ldarg_0);
1003                         if (capture_context != null && CurrentAnonymousMethod != null){
1004                                 ScopeInfo si = CurrentAnonymousMethod.Scope;
1005                                 while (si != null){
1006                                         if (si.ParentLink != null)
1007                                                 ig.Emit (OpCodes.Ldfld, si.ParentLink);
1008                                         if (si.THIS != null){
1009                                                 if (need_address && TypeManager.IsValueType (si.THIS.FieldType))
1010                                                         ig.Emit (OpCodes.Ldflda, si.THIS);
1011                                                 else
1012                                                         ig.Emit (OpCodes.Ldfld, si.THIS);
1013                                                 break;
1014                                         }
1015                                         si = si.ParentScope;
1016                                 }
1017                         }
1018                 }
1019
1020                 //
1021                 // Emits the code necessary to load the instance required
1022                 // to access the captured LocalInfo
1023                 //
1024                 public void EmitCapturedVariableInstance (LocalInfo li)
1025                 {
1026                         if (capture_context == null)
1027                                 throw new Exception ("Calling EmitCapturedContext when there is no capture_context");
1028
1029                         capture_context.EmitCapturedVariableInstance (this, li, CurrentAnonymousMethod);
1030                 }
1031
1032                 public void EmitParameter (string name, bool leave_copy, bool prepared, ref LocalTemporary temp)
1033                 {
1034                         capture_context.EmitParameter (this, name, leave_copy, prepared, ref temp);
1035                 }
1036
1037                 public void EmitAssignParameter (string name, Expression source, bool leave_copy, bool prepare_for_load, ref LocalTemporary  temp)
1038                 {
1039                         capture_context.EmitAssignParameter (this, name, source, leave_copy, prepare_for_load, ref temp);
1040                 }
1041
1042                 public void EmitAddressOfParameter (string name)
1043                 {
1044                         capture_context.EmitAddressOfParameter (this, name);
1045                 }
1046
1047                 public Expression GetThis (Location loc)
1048                 {
1049                         This my_this;
1050                         if (CurrentBlock != null)
1051                                 my_this = new This (CurrentBlock, loc);
1052                         else
1053                                 my_this = new This (loc);
1054
1055                         if (!my_this.ResolveBase (this))
1056                                 my_this = null;
1057
1058                         return my_this;
1059                 }
1060         }
1061
1062
1063         public abstract class CommonAssemblyModulClass : Attributable, IResolveContext {
1064
1065                 protected CommonAssemblyModulClass ():
1066                         base (null)
1067                 {
1068                 }
1069
1070                 public void AddAttributes (ArrayList attrs)
1071                 {
1072                         foreach (Attribute a in attrs)
1073                                 a.AttachTo (this);
1074
1075                         if (attributes == null) {
1076                                 attributes = new Attributes (attrs);
1077                                 return;
1078                         }
1079                         attributes.AddAttributes (attrs);
1080                 }
1081
1082                 public virtual void Emit (TypeContainer tc)
1083                 {
1084                         if (OptAttributes == null)
1085                                 return;
1086
1087                         OptAttributes.Emit ();
1088                 }
1089
1090                 protected Attribute ResolveAttribute (Type a_type)
1091                 {
1092                         if (OptAttributes == null)
1093                                 return null;
1094
1095                         // Ensure that we only have GlobalAttributes, since the Search below isn't safe with other types.
1096                         if (!OptAttributes.CheckTargets ())
1097                                 return null;
1098
1099                         Attribute a = OptAttributes.Search (a_type);
1100                         if (a != null) {
1101                                 a.Resolve ();
1102                         }
1103                         return a;
1104                 }
1105
1106                 public override IResolveContext ResolveContext {
1107                         get { return this; }
1108                 }
1109
1110                 #region IResolveContext Members
1111
1112                 public DeclSpace DeclContainer {
1113                         get { return RootContext.ToplevelTypes; }
1114                 }
1115
1116                 public DeclSpace GenericDeclContainer {
1117                         get { return DeclContainer; }
1118                 }
1119
1120                 public bool IsInObsoleteScope {
1121                         get { return false; }
1122                 }
1123
1124                 public bool IsInUnsafeScope {
1125                         get { return false; }
1126                 }
1127
1128                 #endregion
1129         }
1130
1131         public class AssemblyClass : CommonAssemblyModulClass {
1132                 // TODO: make it private and move all builder based methods here
1133                 public AssemblyBuilder Builder;
1134                 public AssemblyName Name;
1135
1136                 bool is_cls_compliant;
1137                 bool wrap_non_exception_throws;
1138
1139                 public Attribute ClsCompliantAttribute;
1140
1141                 ListDictionary declarative_security;
1142                 MethodInfo add_type_forwarder;
1143
1144                 // Module is here just because of error messages
1145                 static string[] attribute_targets = new string [] { "assembly", "module" };
1146
1147                 public AssemblyClass (): base ()
1148                 {
1149                         wrap_non_exception_throws = true;
1150                 }
1151
1152                 public bool IsClsCompliant {
1153                         get {
1154                                 return is_cls_compliant;
1155                         }
1156                 }
1157
1158                 public bool WrapNonExceptionThrows {
1159                         get {
1160                                 return wrap_non_exception_throws;
1161                         }
1162                 }
1163
1164                 public override AttributeTargets AttributeTargets {
1165                         get {
1166                                 return AttributeTargets.Assembly;
1167                         }
1168                 }
1169
1170                 public override bool IsClsComplianceRequired ()
1171                 {
1172                         return is_cls_compliant;
1173                 }
1174
1175                 public void Resolve ()
1176                 {
1177                         ClsCompliantAttribute = ResolveAttribute (TypeManager.cls_compliant_attribute_type);
1178                         if (ClsCompliantAttribute != null) {
1179                                 is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue ();
1180                         }
1181
1182 #if GMCS_SOURCE
1183                         Attribute a = ResolveAttribute (TypeManager.runtime_compatibility_attr_type);
1184                         if (a != null) {
1185                                 object val = a.GetPropertyValue ("WrapNonExceptionThrows");
1186                                 if (val != null)
1187                                         wrap_non_exception_throws = (bool)val;
1188                         }
1189 #endif
1190                 }
1191
1192                 // fix bug #56621
1193                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1194                 {
1195                         try {
1196                                 // check for possible ECMA key
1197                                 if (strongNameBlob.Length == 16) {
1198                                         // will be rejected if not "the" ECMA key
1199                                         an.SetPublicKey (strongNameBlob);
1200                                 }
1201                                 else {
1202                                         // take it, with or without, a private key
1203                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1204                                         // and make sure we only feed the public part to Sys.Ref
1205                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1206
1207                                         // AssemblyName.SetPublicKey requires an additional header
1208                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1209
1210                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1211                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1212                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1213                                         an.SetPublicKey (encodedPublicKey);
1214                                 }
1215                         }
1216                         catch (Exception) {
1217                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
1218                                 Environment.Exit (1);
1219                         }
1220                 }
1221
1222                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1223                 public AssemblyName GetAssemblyName (string name, string output)
1224                 {
1225                         if (OptAttributes != null) {
1226                                 foreach (Attribute a in OptAttributes.Attrs) {
1227                                         // cannot rely on any resolve-based members before you call Resolve
1228                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1229                                                 continue;
1230
1231                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
1232                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
1233                                         //       are loaded yet.
1234                                         // TODO: Does not handle quoted attributes properly
1235                                         switch (a.Name) {
1236                                                 case "AssemblyKeyFile":
1237                                                 case "AssemblyKeyFileAttribute":
1238                                                 case "System.Reflection.AssemblyKeyFileAttribute":
1239                                                         if (RootContext.StrongNameKeyFile != null) {
1240                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1241                                                                 Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1242                                     "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1243                                                         }
1244                                                         else {
1245                                                                 string value = a.GetString ();
1246                                                                 if (value.Length != 0)
1247                                                                         RootContext.StrongNameKeyFile = value;
1248                                                         }
1249                                                         break;
1250                                                 case "AssemblyKeyName":
1251                                                 case "AssemblyKeyNameAttribute":
1252                                                 case "System.Reflection.AssemblyKeyNameAttribute":
1253                                                         if (RootContext.StrongNameKeyContainer != null) {
1254                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1255                                                                 Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1256                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
1257                                                         }
1258                                                         else {
1259                                                                 string value = a.GetString ();
1260                                                                 if (value.Length != 0)
1261                                                                         RootContext.StrongNameKeyContainer = value;
1262                                                         }
1263                                                         break;
1264                                                 case "AssemblyDelaySign":
1265                                                 case "AssemblyDelaySignAttribute":
1266                                                 case "System.Reflection.AssemblyDelaySignAttribute":
1267                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1268                                                         break;
1269                                         }
1270                                 }
1271                         }
1272
1273                         AssemblyName an = new AssemblyName ();
1274                         an.Name = Path.GetFileNameWithoutExtension (name);
1275
1276                         // note: delay doesn't apply when using a key container
1277                         if (RootContext.StrongNameKeyContainer != null) {
1278                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1279                                 return an;
1280                         }
1281
1282                         // strongname is optional
1283                         if (RootContext.StrongNameKeyFile == null)
1284                                 return an;
1285
1286                         string AssemblyDir = Path.GetDirectoryName (output);
1287
1288                         // the StrongName key file may be relative to (a) the compiled
1289                         // file or (b) to the output assembly. See bugzilla #55320
1290                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1291
1292                         // (a) relative to the compiled file
1293                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1294                         bool exist = File.Exists (filename);
1295                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1296                                 // (b) relative to the outputed assembly
1297                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1298                                 exist = File.Exists (filename);
1299                         }
1300
1301                         if (exist) {
1302                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1303                                         byte[] snkeypair = new byte [fs.Length];
1304                                         fs.Read (snkeypair, 0, snkeypair.Length);
1305
1306                                         if (RootContext.StrongNameDelaySign) {
1307                                                 // delayed signing - DO NOT include private key
1308                                                 SetPublicKey (an, snkeypair);
1309                                         }
1310                                         else {
1311                                                 // no delay so we make sure we have the private key
1312                                                 try {
1313                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1314                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1315                                                 }
1316                                                 catch (CryptographicException) {
1317                                                         if (snkeypair.Length == 16) {
1318                                                                 // error # is different for ECMA key
1319                                                                 Report.Error (1606, "Could not sign the assembly. " +
1320                                                                         "ECMA key can only be used to delay-sign assemblies");
1321                                                         }
1322                                                         else {
1323                                                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not have a private key");
1324                                                         }
1325                                                         return null;
1326                                                 }
1327                                         }
1328                                 }
1329                         }
1330                         else {
1331                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not exist");
1332                                 return null;
1333                         }
1334                         return an;
1335                 }
1336
1337                 void Error_AssemblySigning (string text)
1338                 {
1339                         Report.Error (1548, "Error during assembly signing. " + text);
1340                 }
1341
1342                 bool CheckInternalsVisibleAttribute (Attribute a)
1343                 {
1344                         string assembly_name = a.GetString ();
1345                         if (assembly_name.Length == 0)
1346                                 return false;
1347
1348                         AssemblyName aname = null;
1349                         try {
1350                                 aname = new AssemblyName (assembly_name);
1351                         } catch (FileLoadException) {
1352                         } catch (ArgumentException) {
1353                         }
1354
1355                         // Bad assembly name format
1356                         if (aname == null)
1357                                 Report.Warning (1700, 3, a.Location, "Assembly reference `" + assembly_name + "' is invalid and cannot be resolved");
1358                         // Report error if we have defined Version or Culture
1359                         else if (aname.Version != null || aname.CultureInfo != null)
1360                                 throw new Exception ("Friend assembly `" + a.GetString () +
1361                                                 "' is invalid. InternalsVisibleTo cannot have version or culture specified.");
1362                         else if (aname.GetPublicKey () == null && Name.GetPublicKey () != null) {
1363                                 Report.Error (1726, a.Location, "Friend assembly reference `" + aname.FullName + "' is invalid." +
1364                                                 " Strong named assemblies must specify a public key in their InternalsVisibleTo declarations");
1365                                 return false;
1366                         }
1367
1368                         return true;
1369                 }
1370
1371                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1372                 {
1373                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1374                                 if (declarative_security == null)
1375                                         declarative_security = new ListDictionary ();
1376
1377                                 a.ExtractSecurityPermissionSet (declarative_security);
1378                                 return;
1379                         }
1380
1381                         if (a.Type == TypeManager.assembly_culture_attribute_type) {
1382                                 string value = a.GetString ();
1383                                 if (value == null || value.Length == 0)
1384                                         return;
1385
1386                                 if (RootContext.Target == Target.Exe) {
1387                                         a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
1388                                         return;
1389                                 }
1390                         }
1391
1392                         if (a.Type == TypeManager.internals_visible_attr_type && !CheckInternalsVisibleAttribute (a))
1393                                 return;
1394
1395                         if (a.Type == TypeManager.type_forwarder_attr_type) {
1396                                 Type t = a.GetArgumentType ();
1397                                 if (t == null || TypeManager.HasElementType (t)) {
1398                                         Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
1399                                         return;
1400                                 }
1401
1402                                 if (TypeManager.LookupDeclSpace (t) != null) {
1403                                         Report.SymbolRelatedToPreviousError (t);
1404                                         Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
1405                                                 TypeManager.CSharpName (t));
1406                                         return;
1407                                 }
1408
1409                                 if (t.IsNested) {
1410                                         Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
1411                                                 TypeManager.CSharpName (t));
1412                                         return;
1413                                 }
1414
1415                                 if (t.IsGenericType) {
1416                                         Report.Error (733, a.Location, "Cannot forward generic type `{0}'", TypeManager.CSharpName (t));
1417                                         return;
1418                                 }
1419
1420                                 if (add_type_forwarder == null) {
1421                                         add_type_forwarder = typeof (AssemblyBuilder).GetMethod ("AddTypeForwarder",
1422                                                 BindingFlags.NonPublic | BindingFlags.Instance);
1423
1424                                         if (add_type_forwarder == null) {
1425                                                 Report.RuntimeMissingSupport (a.Location, "TypeForwardedTo attribute");
1426                                                 return;
1427                                         }
1428                                 }
1429
1430                                 add_type_forwarder.Invoke (Builder, new object[] { t });
1431                                 return;
1432                         }
1433
1434                         Builder.SetCustomAttribute (customBuilder);
1435                 }
1436
1437                 public override void Emit (TypeContainer tc)
1438                 {
1439                         base.Emit (tc);
1440
1441                         // FIXME: Does this belong inside SRE.AssemblyBuilder instead?
1442                         if (OptAttributes == null || !OptAttributes.Contains (TypeManager.runtime_compatibility_attr_type)) {
1443                                 ConstructorInfo ci = TypeManager.GetConstructor (
1444                                         TypeManager.runtime_compatibility_attr_type, Type.EmptyTypes);
1445                                 PropertyInfo [] pis = new PropertyInfo [1];
1446                                 pis [0] = TypeManager.GetProperty (
1447                                         TypeManager.runtime_compatibility_attr_type, "WrapNonExceptionThrows");
1448                                 object [] pargs = new object [1];
1449                                 pargs [0] = true;
1450                                 Builder.SetCustomAttribute (new CustomAttributeBuilder (ci, new object [0], pis, pargs));
1451                         }
1452
1453                         if (declarative_security != null) {
1454
1455                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1456                                 object builder_instance = Builder;
1457
1458                                 try {
1459                                         // Microsoft runtime hacking
1460                                         if (add_permission == null) {
1461                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1462                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1463
1464                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1465                                                 builder_instance = fi.GetValue (Builder);
1466                                         }
1467
1468                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1469                                                                                                   declarative_security [SecurityAction.RequestOptional],
1470                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1471                                         add_permission.Invoke (builder_instance, args);
1472                                 }
1473                                 catch {
1474                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1475                                 }
1476                         }
1477                 }
1478
1479                 public override string[] ValidAttributeTargets {
1480                         get {
1481                                 return attribute_targets;
1482                         }
1483                 }
1484         }
1485
1486         public class ModuleClass : CommonAssemblyModulClass {
1487                 // TODO: make it private and move all builder based methods here
1488                 public ModuleBuilder Builder;
1489                 bool m_module_is_unsafe;
1490
1491                 public CharSet DefaultCharSet = CharSet.Ansi;
1492                 public TypeAttributes DefaultCharSetType = TypeAttributes.AnsiClass;
1493
1494                 static string[] attribute_targets = new string [] { "module" };
1495
1496                 public ModuleClass (bool is_unsafe)
1497                 {
1498                         m_module_is_unsafe = is_unsafe;
1499                 }
1500
1501                 public override AttributeTargets AttributeTargets {
1502                         get {
1503                                 return AttributeTargets.Module;
1504                         }
1505                 }
1506
1507                 public override bool IsClsComplianceRequired ()
1508                 {
1509                         return CodeGen.Assembly.IsClsCompliant;
1510                 }
1511
1512                 public override void Emit (TypeContainer tc)
1513                 {
1514                         base.Emit (tc);
1515
1516                         if (!m_module_is_unsafe)
1517                                 return;
1518
1519                         if (TypeManager.unverifiable_code_ctor == null) {
1520                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1521                                 return;
1522                         }
1523
1524                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1525                 }
1526
1527                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1528                 {
1529                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1530                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1531                                         Report.Warning (3012, 1, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1532                                 }
1533                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1534                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.GetSignatureForError ());
1535                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1536                                         return;
1537                                 }
1538                         }
1539
1540                         Builder.SetCustomAttribute (customBuilder);
1541                 }
1542
1543                 /// <summary>
1544                 /// It is called very early therefore can resolve only predefined attributes
1545                 /// </summary>
1546                 public void ResolveAttributes ()
1547                 {
1548 #if GMCS_SOURCE
1549                         Attribute a = ResolveAttribute (TypeManager.default_charset_type);
1550                         if (a != null) {
1551                                 DefaultCharSet = a.GetCharSetValue ();
1552                                 switch (DefaultCharSet) {
1553                                         case CharSet.Ansi:
1554                                         case CharSet.None:
1555                                                 break;
1556                                         case CharSet.Auto:
1557                                                 DefaultCharSetType = TypeAttributes.AutoClass;
1558                                                 break;
1559                                         case CharSet.Unicode:
1560                                                 DefaultCharSetType = TypeAttributes.UnicodeClass;
1561                                                 break;
1562                                         default:
1563                                                 Report.Error (1724, a.Location, "Value specified for the argument to 'System.Runtime.InteropServices.DefaultCharSetAttribute' is not valid");
1564                                                 break;
1565                                 }
1566                         }
1567 #endif
1568                 }
1569
1570                 public override string[] ValidAttributeTargets {
1571                         get {
1572                                 return attribute_targets;
1573                         }
1574                 }
1575         }
1576 }