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