mcs/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.Globalization;
  25 using System.Reflection;
  26 using System.Reflection.Emit;
  27 using System.Runtime.InteropServices;
  28 using System.Security;
  29 using System.Security.Cryptography;
  30 using System.Security.Permissions;
  31
  32 using Mono.Security.Cryptography;
  33
  34 namespace Mono.CSharp {
  35
  36         /// <summary>
  37         ///    Code generator class.
  38         /// </summary>
  39         public class CodeGen {
  40                 static AppDomain current_domain;
  41                 static public SymbolWriter SymbolWriter;
  42
  43                 public static AssemblyClass Assembly;
  44                 public static ModuleClass Module;
  45
  46                 static CodeGen ()
  47                 {
  48                         Reset ();
  49                 }
  50
  51                 public static void Reset ()
  52                 {
  53                         Assembly = new AssemblyClass ();
  54                         Module = new ModuleClass (RootContext.Unsafe);
  55                 }
  56
  57                 public static string Basename (string name)
  58                 {
  59                         int pos = name.LastIndexOf ('/');
  60
  61                         if (pos != -1)
  62                                 return name.Substring (pos + 1);
  63
  64                         pos = name.LastIndexOf ('\\');
  65                         if (pos != -1)
  66                                 return name.Substring (pos + 1);
  67
  68                         return name;
  69                 }
  70
  71                 public static string Dirname (string name)
  72                 {
  73                         int pos = name.LastIndexOf ('/');
  74
  75                         if (pos != -1)
  76                                 return name.Substring (0, pos);
  77
  78                         pos = name.LastIndexOf ('\\');
  79                         if (pos != -1)
  80                                 return name.Substring (0, pos);
  81
  82                         return ".";
  83                 }
  84
  85                 static public string FileName;
  86
  87                 //
  88                 // Initializes the symbol writer
  89                 //
  90                 static void InitializeSymbolWriter (string filename)
  91                 {
  92                         SymbolWriter = SymbolWriter.GetSymbolWriter (Module.Builder, filename);
  93
  94                         //
  95                         // If we got an ISymbolWriter instance, initialize it.
  96                         //
  97                         if (SymbolWriter == null) {
  98                                 Report.Warning (
  99                                         -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.");
 100                                 return;
 101                         }
 102                 }
 103
 104                 //
 105                 // Initializes the code generator variables
 106                 //
 107                 static public bool Init (string name, string output, bool want_debugging_support)
 108                 {
 109                         FileName = output;
 110                         AssemblyName an = Assembly.GetAssemblyName (name, output);
 111                         if (an == null)
 112                                 return false;
 113
 114                         if (an.KeyPair != null) {
 115                                 // If we are going to strong name our assembly make
 116                                 // sure all its refs are strong named
 117                                 foreach (Assembly a in RootNamespace.Global.Assemblies) {
 118                                         AssemblyName ref_name = a.GetName ();
 119                                         byte [] b = ref_name.GetPublicKeyToken ();
 120                                         if (b == null || b.Length == 0) {
 121                                                 Report.Error (1577, "Assembly generation failed " +
 122                                                                 "-- Referenced assembly '" +
 123                                                                 ref_name.Name +
 124                                                                 "' does not have a strong name.");
 125                                                 //Environment.Exit (1);
 126                                         }
 127                                 }
 128                         }
 129
 130                         current_domain = AppDomain.CurrentDomain;
 131
 132                         try {
 133                                 Assembly.Builder = current_domain.DefineDynamicAssembly (an,
 134                                         AssemblyBuilderAccess.Save, Dirname (name));
 135                         }
 136                         catch (ArgumentException) {
 137                                 // specified key may not be exportable outside it's container
 138                                 if (RootContext.StrongNameKeyContainer != null) {
 139                                         Report.Error (1548, "Could not access the key inside the container `" +
 140                                                 RootContext.StrongNameKeyContainer + "'.");
 141                                         Environment.Exit (1);
 142                                 }
 143                                 return false;
 144                         }
 145                         catch (CryptographicException) {
 146                                 if ((RootContext.StrongNameKeyContainer != null) || (RootContext.StrongNameKeyFile != null)) {
 147                                         Report.Error (1548, "Could not use the specified key to strongname the assembly.");
 148                                         Environment.Exit (1);
 149                                 }
 150                                 return false;
 151                         }
 152
 153 #if GMCS_SOURCE
 154                         // Get the complete AssemblyName from the builder
 155                         // (We need to get the public key and token)
 156                         Assembly.Name = Assembly.Builder.GetName ();
 157 #endif
 158
 159                         //
 160                         // Pass a path-less name to DefineDynamicModule.  Wonder how
 161                         // this copes with output in different directories then.
 162                         // FIXME: figure out how this copes with --output /tmp/blah
 163                         //
 164                         // If the third argument is true, the ModuleBuilder will dynamically
 165                         // load the default symbol writer.
 166                         //
 167                         Module.Builder = Assembly.Builder.DefineDynamicModule (
 168                                 Basename (name), Basename (output), false);
 169
 170                         if (want_debugging_support)
 171                                 InitializeSymbolWriter (output);
 172
 173                         return true;
 174                 }
 175
 176                 static public void Save (string name)
 177                 {
 178                         try {
 179                                 Assembly.Builder.Save (Basename (name));
 180
 181                                 if (SymbolWriter != null)
 182                                         SymbolWriter.WriteSymbolFile ();
 183                         }
 184                         catch (COMException) {
 185                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 186                                         throw;
 187
 188                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 189                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 190                                         RootContext.StrongNameKeyFile +
 191                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 192                         }
 193                         catch (System.IO.IOException io) {
 194                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 195                         }
 196                         catch (System.UnauthorizedAccessException ua) {
 197                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + ua.Message);
 198                         }
 199                 }
 200         }
 201
 202
 203         public interface IResolveContext
 204         {
 205                 DeclSpace DeclContainer { get; }
 206                 bool IsInObsoleteScope { get; }
 207                 bool IsInUnsafeScope { get; }
 208
 209                 // the declcontainer to lookup for type-parameters.  Should only use LookupGeneric on it.
 210                 //
 211                 // FIXME: This is somewhat of a hack.  We don't need a full DeclSpace for this.  We just need the
 212                 //        current type parameters in scope. IUIC, that will require us to rewrite GenericMethod.
 213                 //        Maybe we can replace this with a 'LookupGeneric (string)' instead, but we'll have to
 214                 //        handle generic method overrides differently
 215                 DeclSpace GenericDeclContainer { get; }
 216         }
 217
 218         /// <summary>
 219         ///   An Emit Context is created for each body of code (from methods,
 220         ///   properties bodies, indexer bodies or constructor bodies)
 221         /// </summary>
 222         public class EmitContext : IResolveContext {
 223
 224                 //
 225                 // Holds a varible used during collection or object initialization.
 226                 //
 227                 public Expression CurrentInitializerVariable;
 228
 229                 DeclSpace decl_space;
 230
 231                 public DeclSpace TypeContainer;
 232                 public ILGenerator ig;
 233
 234                 [Flags]
 235                 public enum Flags : int {
 236                         /// <summary>
 237                         ///   This flag tracks the `checked' state of the compilation,
 238                         ///   it controls whether we should generate code that does overflow
 239                         ///   checking, or if we generate code that ignores overflows.
 240                         ///
 241                         ///   The default setting comes from the command line option to generate
 242                         ///   checked or unchecked code plus any source code changes using the
 243                         ///   checked/unchecked statements or expressions.   Contrast this with
 244                         ///   the ConstantCheckState flag.
 245                         /// </summary>
 246                         CheckState = 1 << 0,
 247
 248                         /// <summary>
 249                         ///   The constant check state is always set to `true' and cant be changed
 250                         ///   from the command line.  The source code can change this setting with
 251                         ///   the `checked' and `unchecked' statements and expressions.
 252                         /// </summary>
 253                         ConstantCheckState = 1 << 1,
 254
 255                         AllCheckStateFlags = CheckState | ConstantCheckState,
 256
 257                         /// <summary>
 258                         ///  Whether we are inside an unsafe block
 259                         /// </summary>
 260                         InUnsafe = 1 << 2,
 261
 262                         InCatch = 1 << 3,
 263                         InFinally = 1 << 4,
 264
 265                         /// <summary>
 266                         ///   Whether control flow analysis is enabled
 267                         /// </summary>
 268                         DoFlowAnalysis = 1 << 5,
 269
 270                         /// <summary>
 271                         ///   Whether control flow analysis is disabled on structs
 272                         ///   (only meaningful when DoFlowAnalysis is set)
 273                         /// </summary>
 274                         OmitStructFlowAnalysis = 1 << 6,
 275
 276                         ///
 277                         /// Indicates the current context is in probing mode, no errors are reported.
 278                         ///
 279                         ProbingMode = 1 <<      7,
 280
 281                         //
 282                         // Inside field intializer expression
 283                         //
 284                         InFieldInitializer = 1 << 8,
 285
 286                         InferReturnType = 1 << 9
 287                 }
 288
 289                 Flags flags;
 290
 291                 /// <summary>
 292                 ///   Whether we are emitting code inside a static or instance method
 293                 /// </summary>
 294                 public bool IsStatic;
 295
 296                 /// <summary>
 297                 ///   Whether the actual created method is static or instance method.
 298                 ///   Althoug the method might be declared as `static', if an anonymous
 299                 ///   method is involved, we might turn this into an instance method.
 300                 ///
 301                 ///   So this reflects the low-level staticness of the method, while
 302                 ///   IsStatic represents the semantic, high-level staticness.
 303                 /// </summary>
 304                 public bool MethodIsStatic;
 305
 306                 /// <summary>
 307                 ///   The value that is allowed to be returned or NULL if there is no
 308                 ///   return type.
 309                 /// </summary>
 310                 Type return_type;
 311
 312                 /// <summary>
 313                 ///   Points to the Type (extracted from the TypeContainer) that
 314                 ///   declares this body of code
 315                 /// </summary>
 316                 public readonly Type ContainerType;
 317
 318                 /// <summary>
 319                 ///   Whether this is generating code for a constructor
 320                 /// </summary>
 321                 public bool IsConstructor;
 322
 323                 /// <summary>
 324                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 325                 ///   to store structures (used to compute the address of the structure
 326                 ///   value on structure method invocations)
 327                 /// </summary>
 328                 public Hashtable temporary_storage;
 329
 330                 public Block CurrentBlock;
 331
 332                 public int CurrentFile;
 333
 334                 /// <summary>
 335                 ///   The location where we store the return value.
 336                 /// </summary>
 337                 LocalBuilder return_value;
 338
 339                 /// <summary>
 340                 ///   The location where return has to jump to return the
 341                 ///   value
 342                 /// </summary>
 343                 public Label ReturnLabel;
 344
 345                 /// <summary>
 346                 ///   If we already defined the ReturnLabel
 347                 /// </summary>
 348                 public bool HasReturnLabel;
 349
 350                 /// <summary>
 351                 ///   Whether we are inside an iterator block.
 352                 /// </summary>
 353                 public bool InIterator;
 354
 355                 /// <summary>
 356                 ///  Whether we are in a `fixed' initialization
 357                 /// </summary>
 358                 public bool InFixedInitializer;
 359
 360                 /// <summary>
 361                 ///  Whether we are inside an anonymous method.
 362                 /// </summary>
 363                 public AnonymousContainer CurrentAnonymousMethod;
 364
 365                 /// <summary>
 366                 ///   Location for this EmitContext
 367                 /// </summary>
 368                 public Location loc;
 369
 370                 /// <summary>
 371                 ///   Inside an enum definition, we do not resolve enumeration values
 372                 ///   to their enumerations, but rather to the underlying type/value
 373                 ///   This is so EnumVal + EnumValB can be evaluated.
 374                 ///
 375                 ///   There is no "E operator + (E x, E y)", so during an enum evaluation
 376                 ///   we relax the rules
 377                 /// </summary>
 378                 public bool InEnumContext;
 379
 380                 public readonly IResolveContext ResolveContext;
 381
 382                 /// <summary>
 383                 ///    The current iterator
 384                 /// </summary>
 385                 public Iterator CurrentIterator {
 386                         get { return CurrentAnonymousMethod as Iterator; }
 387                 }
 388
 389                 /// <summary>
 390                 ///    Whether we are in the resolving stage or not
 391                 /// </summary>
 392                 enum Phase {
 393                         Created,
 394                         Resolving,
 395                         Emitting
 396                 }
 397
 398                 public static EmitContext TempEc;
 399
 400                 bool isAnonymousMethodAllowed = true;
 401
 402                 Phase current_phase;
 403                 FlowBranching current_flow_branching;
 404
 405                 static int next_id = 0;
 406                 int id = ++next_id;
 407
 408                 public override string ToString ()
 409                 {
 410                         return String.Format ("EmitContext ({0}:{1})", id,
 411                                               CurrentAnonymousMethod, loc);
 412                 }
 413
 414                 public EmitContext (IResolveContext rc, DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 415                                     Type return_type, int code_flags, bool is_constructor)
 416                 {
 417                         this.ResolveContext = rc;
 418                         this.ig = ig;
 419
 420                         TypeContainer = parent;
 421                         this.decl_space = ds;
 422                         if (RootContext.Checked)
 423                                 flags |= Flags.CheckState;
 424                         flags |= Flags.ConstantCheckState;
 425
 426                         if (return_type == null)
 427                                 throw new ArgumentNullException ("return_type");
 428 #if GMCS_SOURCE
 429                         if ((return_type is TypeBuilder) && return_type.IsGenericTypeDefinition)
 430                                 throw new InternalErrorException ();
 431 #endif
 432
 433                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 434                         MethodIsStatic = IsStatic;
 435                         InIterator = (code_flags & Modifiers.METHOD_YIELDS) != 0;
 436                         ReturnType = return_type;
 437                         IsConstructor = is_constructor;
 438                         CurrentBlock = null;
 439                         CurrentFile = 0;
 440                         current_phase = Phase.Created;
 441
 442                         if (parent != null){
 443                                 // Can only be null for the ResolveType contexts.
 444                                 ContainerType = parent.TypeBuilder;
 445                                 if (rc.IsInUnsafeScope)
 446                                         flags |= Flags.InUnsafe;
 447                         }
 448                         loc = l;
 449                 }
 450
 451                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 452                                     Type return_type, int code_flags, bool is_constructor)
 453                         : this (rc, ds, ds, l, ig, return_type, code_flags, is_constructor)
 454                 {
 455                 }
 456
 457                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 458                                     Type return_type, int code_flags)
 459                         : this (rc, ds, ds, l, ig, return_type, code_flags, false)
 460                 {
 461                 }
 462
 463                 public DeclSpace DeclContainer {
 464                         get { return decl_space; }
 465                         set { decl_space = value; }
 466                 }
 467
 468                 public DeclSpace GenericDeclContainer {
 469                         get { return DeclContainer; }
 470                 }
 471
 472                 public bool CheckState {
 473                         get { return (flags & Flags.CheckState) != 0; }
 474                 }
 475
 476                 public bool ConstantCheckState {
 477                         get { return (flags & Flags.ConstantCheckState) != 0; }
 478                 }
 479
 480                 public bool InUnsafe {
 481                         get { return (flags & Flags.InUnsafe) != 0; }
 482                 }
 483
 484                 public bool InCatch {
 485                         get { return (flags & Flags.InCatch) != 0; }
 486                 }
 487
 488                 public bool InFinally {
 489                         get { return (flags & Flags.InFinally) != 0; }
 490                 }
 491
 492                 public bool DoFlowAnalysis {
 493                         get { return (flags & Flags.DoFlowAnalysis) != 0; }
 494                 }
 495
 496                 public bool OmitStructFlowAnalysis {
 497                         get { return (flags & Flags.OmitStructFlowAnalysis) != 0; }
 498                 }
 499
 500                 // utility helper for CheckExpr, UnCheckExpr, Checked and Unchecked statements
 501                 // it's public so that we can use a struct at the callsite
 502                 public struct FlagsHandle : IDisposable
 503                 {
 504                         EmitContext ec;
 505                         readonly Flags invmask, oldval;
 506
 507                         public FlagsHandle (EmitContext ec, Flags flagsToSet)
 508                                 : this (ec, flagsToSet, flagsToSet)
 509                         {
 510                         }
 511
 512                         internal FlagsHandle (EmitContext ec, Flags mask, Flags val)
 513                         {
 514                                 this.ec = ec;
 515                                 invmask = ~mask;
 516                                 oldval = ec.flags & mask;
 517                                 ec.flags = (ec.flags & invmask) | (val & mask);
 518
 519                                 if ((mask & Flags.ProbingMode) != 0)
 520                                         Report.DisableReporting ();
 521                         }
 522
 523                         public void Dispose ()
 524                         {
 525                                 if ((invmask & Flags.ProbingMode) == 0)
 526                                         Report.EnableReporting ();
 527
 528                                 ec.flags = (ec.flags & invmask) | oldval;
 529                         }
 530                 }
 531
 532                 // Temporarily set all the given flags to the given value.  Should be used in an 'using' statement
 533                 public FlagsHandle Set (Flags flagsToSet)
 534                 {
 535                         return new FlagsHandle (this, flagsToSet);
 536                 }
 537
 538                 public FlagsHandle With (Flags bits, bool enable)
 539                 {
 540                         return new FlagsHandle (this, bits, enable ? bits : 0);
 541                 }
 542
 543                 public FlagsHandle WithFlowAnalysis (bool do_flow_analysis, bool omit_struct_analysis)
 544                 {
 545                         Flags newflags =
 546                                 (do_flow_analysis ? Flags.DoFlowAnalysis : 0) |
 547                                 (omit_struct_analysis ? Flags.OmitStructFlowAnalysis : 0);
 548                         return new FlagsHandle (this, Flags.DoFlowAnalysis | Flags.OmitStructFlowAnalysis, newflags);
 549                 }
 550
 551                 /// <summary>
 552                 ///   If this is true, then Return and ContextualReturn statements
 553                 ///   will set the ReturnType value based on the expression types
 554                 ///   of each return statement instead of the method return type
 555                 ///   (which is initially null).
 556                 /// </summary>
 557                 public bool InferReturnType {
 558                         get { return (flags & Flags.InferReturnType) != 0; }
 559                 }
 560
 561                 public bool IsInObsoleteScope {
 562                         get {
 563                                 // Disables obsolete checks when probing is on
 564                                 return IsInProbingMode || ResolveContext.IsInObsoleteScope;
 565                         }
 566                 }
 567
 568                 public bool IsInProbingMode {
 569                         get { return (flags & Flags.ProbingMode) != 0; }
 570                 }
 571
 572                 public bool IsInUnsafeScope {
 573                         get { return InUnsafe || ResolveContext.IsInUnsafeScope; }
 574                 }
 575
 576                 public bool IsAnonymousMethodAllowed {
 577                         get { return isAnonymousMethodAllowed; }
 578                         set { isAnonymousMethodAllowed = value; }
 579                 }
 580
 581                 public bool IsInFieldInitializer {
 582                         get { return (flags & Flags.InFieldInitializer) != 0; }
 583                 }
 584
 585                 public FlowBranching CurrentBranching {
 586                         get { return current_flow_branching; }
 587                 }
 588
 589                 // <summary>
 590                 //   Starts a new code branching.  This inherits the state of all local
 591                 //   variables and parameters from the current branching.
 592                 // </summary>
 593                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 594                 {
 595                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 596                         return current_flow_branching;
 597                 }
 598
 599                 // <summary>
 600                 //   Starts a new code branching for block `block'.
 601                 // </summary>
 602                 public FlowBranching StartFlowBranching (Block block)
 603                 {
 604                         FlowBranching.BranchingType type;
 605
 606                         if ((CurrentBranching != null) &&
 607                             (CurrentBranching.Type == FlowBranching.BranchingType.Switch))
 608                                 type = FlowBranching.BranchingType.SwitchSection;
 609                         else
 610                                 type = FlowBranching.BranchingType.Block;
 611
 612                         flags |= Flags.DoFlowAnalysis;
 613
 614                         current_flow_branching = FlowBranching.CreateBranching (
 615                                 CurrentBranching, type, block, block.StartLocation);
 616                         return current_flow_branching;
 617                 }
 618
 619                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 620                 {
 621                         FlowBranchingException branching = new FlowBranchingException (CurrentBranching, stmt);
 622                         current_flow_branching = branching;
 623                         return branching;
 624                 }
 625
 626                 public FlowBranchingLabeled StartFlowBranching (LabeledStatement stmt)
 627                 {
 628                         FlowBranchingLabeled branching = new FlowBranchingLabeled (CurrentBranching, stmt);
 629                         current_flow_branching = branching;
 630                         return branching;
 631                 }
 632
 633                 public FlowBranchingToplevel StartFlowBranching (ToplevelBlock stmt)
 634                 {
 635                         FlowBranchingToplevel branching = new FlowBranchingToplevel (CurrentBranching, stmt);
 636                         current_flow_branching = branching;
 637                         return branching;
 638                 }
 639
 640                 // <summary>
 641                 //   Ends a code branching.  Merges the state of locals and parameters
 642                 //   from all the children of the ending branching.
 643                 // </summary>
 644                 public FlowBranching.UsageVector DoEndFlowBranching ()
 645                 {
 646                         FlowBranching old = current_flow_branching;
 647                         current_flow_branching = current_flow_branching.Parent;
 648
 649                         return current_flow_branching.MergeChild (old);
 650                 }
 651
 652                 // <summary>
 653                 //   Ends a code branching.  Merges the state of locals and parameters
 654                 //   from all the children of the ending branching.
 655                 // </summary>
 656                 public bool EndFlowBranching ()
 657                 {
 658                         FlowBranching.UsageVector vector = DoEndFlowBranching ();
 659
 660                         return vector.IsUnreachable;
 661                 }
 662
 663                 // <summary>
 664                 //   Kills the current code branching.  This throws away any changed state
 665                 //   information and should only be used in case of an error.
 666                 // </summary>
 667                 public void KillFlowBranching ()
 668                 {
 669                         current_flow_branching = current_flow_branching.Parent;
 670                 }
 671
 672                 public bool MustCaptureVariable (LocalInfo local)
 673                 {
 674                         if (CurrentAnonymousMethod == null)
 675                                 return false;
 676                         if (CurrentAnonymousMethod.IsIterator)
 677                                 return true;
 678                         return local.Block.Toplevel != CurrentBlock.Toplevel;
 679                 }
 680
 681                 public void EmitMeta (ToplevelBlock b)
 682                 {
 683                         b.EmitMeta (this);
 684
 685                         if (HasReturnLabel)
 686                                 ReturnLabel = ig.DefineLabel ();
 687                 }
 688
 689                 //
 690                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 691                 // currently can not cope with ig == null during resolve (which must
 692                 // be fixed for switch statements to work on anonymous methods).
 693                 //
 694                 public void EmitTopBlock (IMethodData md, ToplevelBlock block)
 695                 {
 696                         if (block == null)
 697                                 return;
 698
 699                         bool unreachable;
 700
 701                         if (ResolveTopBlock (null, block, md.ParameterInfo, md, out unreachable)){
 702                                 if (Report.Errors > 0)
 703                                         return;
 704
 705                                 EmitMeta (block);
 706
 707                                 current_phase = Phase.Emitting;
 708                                 EmitResolvedTopBlock (block, unreachable);
 709                         }
 710                 }
 711
 712                 bool resolved;
 713
 714                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 715                                              Parameters ip, IMethodData md, out bool unreachable)
 716                 {
 717                         current_phase = Phase.Resolving;
 718
 719                         unreachable = false;
 720
 721                         if (resolved)
 722                                 return true;
 723
 724                         if (!loc.IsNull)
 725                                 CurrentFile = loc.File;
 726
 727 #if PRODUCTION
 728                         try {
 729 #endif
 730                                 if (!block.ResolveMeta (this, ip))
 731                                         return false;
 732
 733                                 if ((md != null) && (md.Iterator != null)) {
 734                                         if (!md.Iterator.Define (this))
 735                                                 return false;
 736                                 }
 737
 738                                 using (this.With (EmitContext.Flags.DoFlowAnalysis, true)) {
 739                                         FlowBranchingToplevel top_level;
 740                                         if (anonymous_method_host != null)
 741                                                 top_level = new FlowBranchingToplevel (anonymous_method_host.CurrentBranching, block);
 742                                         else
 743                                                 top_level = block.TopLevelBranching;
 744
 745                                         current_flow_branching = top_level;
 746                                         bool ok = block.Resolve (this);
 747                                         current_flow_branching = null;
 748
 749                                         if (!ok)
 750                                                 return false;
 751
 752                                         bool flow_unreachable = top_level.End ();
 753                                         if (flow_unreachable)
 754                                                 unreachable = true;
 755                                 }
 756 #if PRODUCTION
 757                         } catch (Exception e) {
 758                                 Console.WriteLine ("Exception caught by the compiler while compiling:");
 759                                 Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 760
 761                                 if (CurrentBlock != null){
 762                                         Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 763                                                            CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 764                                 }
 765                                 Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 766                                 throw;
 767                         }
 768 #endif
 769
 770                         if (return_type != TypeManager.void_type && !unreachable) {
 771                                 if (CurrentAnonymousMethod == null) {
 772                                         Report.Error (161, md.Location, "`{0}': not all code paths return a value", md.GetSignatureForError ());
 773                                         return false;
 774                                 } else if (!CurrentAnonymousMethod.IsIterator) {
 775                                         Report.Error (1643, CurrentAnonymousMethod.Location, "Not all code paths return a value in anonymous method of type `{0}'",
 776                                                       CurrentAnonymousMethod.GetSignatureForError ());
 777                                         return false;
 778                                 }
 779                         }
 780
 781                         if (!block.CompleteContexts (this))
 782                                 return false;
 783
 784                         resolved = true;
 785                         return true;
 786                 }
 787
 788                 public Type ReturnType {
 789                         set {
 790                                 return_type = value;
 791                         }
 792                         get {
 793                                 return return_type;
 794                         }
 795                 }
 796
 797                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 798                 {
 799                         if (block != null)
 800                                 block.Emit (this);
 801
 802                         if (HasReturnLabel)
 803                                 ig.MarkLabel (ReturnLabel);
 804
 805                         if (return_value != null){
 806                                 ig.Emit (OpCodes.Ldloc, return_value);
 807                                 ig.Emit (OpCodes.Ret);
 808                         } else {
 809                                 //
 810                                 // If `HasReturnLabel' is set, then we already emitted a
 811                                 // jump to the end of the method, so we must emit a `ret'
 812                                 // there.
 813                                 //
 814                                 // Unfortunately, System.Reflection.Emit automatically emits
 815                                 // a leave to the end of a finally block.  This is a problem
 816                                 // if no code is following the try/finally block since we may
 817                                 // jump to a point after the end of the method.
 818                                 // As a workaround, we're always creating a return label in
 819                                 // this case.
 820                                 //
 821
 822                                 bool in_iterator = (CurrentAnonymousMethod != null) &&
 823                                         CurrentAnonymousMethod.IsIterator && InIterator;
 824
 825                                 if ((block != null) && block.IsDestructor) {
 826                                         // Nothing to do; S.R.E automatically emits a leave.
 827                                 } else if (HasReturnLabel || (!unreachable && !in_iterator)) {
 828                                         if (return_type != TypeManager.void_type)
 829                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 830                                         ig.Emit (OpCodes.Ret);
 831                                 }
 832                         }
 833                 }
 834
 835                 /// <summary>
 836                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 837                 ///   writer to which source line this opcode belongs.
 838                 /// </summary>
 839                 public void Mark (Location loc, bool check_file)
 840                 {
 841                         if ((CodeGen.SymbolWriter == null) || loc.IsNull)
 842                                 return;
 843
 844                         if (check_file && (CurrentFile != loc.File))
 845                                 return;
 846
 847                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, loc.Column);
 848                 }
 849
 850                 public void DefineLocalVariable (string name, LocalBuilder builder)
 851                 {
 852                         if (CodeGen.SymbolWriter == null)
 853                                 return;
 854
 855                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 856                 }
 857
 858                 public void BeginScope ()
 859                 {
 860                         ig.BeginScope();
 861
 862                         if (CodeGen.SymbolWriter != null)
 863                                 CodeGen.SymbolWriter.OpenScope(ig);
 864                 }
 865
 866                 public void EndScope ()
 867                 {
 868                         ig.EndScope();
 869
 870                         if (CodeGen.SymbolWriter != null)
 871                                 CodeGen.SymbolWriter.CloseScope(ig);
 872                 }
 873
 874                 /// <summary>
 875                 ///   Returns a temporary storage for a variable of type t as
 876                 ///   a local variable in the current body.
 877                 /// </summary>
 878                 public LocalBuilder GetTemporaryLocal (Type t)
 879                 {
 880                         if (temporary_storage != null) {
 881                                 object o = temporary_storage [t];
 882                                 if (o != null) {
 883                                         if (o is Stack) {
 884                                                 Stack s = (Stack) o;
 885                                                 o = s.Count == 0 ? null : s.Pop ();
 886                                         } else {
 887                                                 temporary_storage.Remove (t);
 888                                         }
 889                                 }
 890                                 if (o != null)
 891                                         return (LocalBuilder) o;
 892                         }
 893                         return ig.DeclareLocal (t);
 894                 }
 895
 896                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 897                 {
 898                         Stack s;
 899
 900                         if (temporary_storage == null) {
 901                                 temporary_storage = new Hashtable ();
 902                                 temporary_storage [t] = b;
 903                                 return;
 904                         }
 905                         object o = temporary_storage [t];
 906                         if (o == null) {
 907                                 temporary_storage [t] = b;
 908                                 return;
 909                         }
 910                         if (o is Stack) {
 911                                 s = (Stack) o;
 912                         } else {
 913                                 s = new Stack ();
 914                                 s.Push (o);
 915                                 temporary_storage [t] = s;
 916                         }
 917                         s.Push (b);
 918                 }
 919
 920                 /// <summary>
 921                 ///   Current loop begin and end labels.
 922                 /// </summary>
 923                 public Label LoopBegin, LoopEnd;
 924
 925                 /// <summary>
 926                 ///   Default target in a switch statement.   Only valid if
 927                 ///   InSwitch is true
 928                 /// </summary>
 929                 public Label DefaultTarget;
 930
 931                 /// <summary>
 932                 ///   If this is non-null, points to the current switch statement
 933                 /// </summary>
 934                 public Switch Switch;
 935
 936                 /// <summary>
 937                 ///   ReturnValue creates on demand the LocalBuilder for the
 938                 ///   return value from the function.  By default this is not
 939                 ///   used.  This is only required when returns are found inside
 940                 ///   Try or Catch statements.
 941                 ///
 942                 ///   This method is typically invoked from the Emit phase, so
 943                 ///   we allow the creation of a return label if it was not
 944                 ///   requested during the resolution phase.   Could be cleaned
 945                 ///   up, but it would replicate a lot of logic in the Emit phase
 946                 ///   of the code that uses it.
 947                 /// </summary>
 948                 public LocalBuilder TemporaryReturn ()
 949                 {
 950                         if (return_value == null){
 951                                 return_value = ig.DeclareLocal (return_type);
 952                                 if (!HasReturnLabel){
 953                                         ReturnLabel = ig.DefineLabel ();
 954                                         HasReturnLabel = true;
 955                                 }
 956                         }
 957
 958                         return return_value;
 959                 }
 960
 961                 /// <summary>
 962                 ///   This method is used during the Resolution phase to flag the
 963                 ///   need to define the ReturnLabel
 964                 /// </summary>
 965                 public void NeedReturnLabel ()
 966                 {
 967                         if (current_phase != Phase.Resolving){
 968                                 //
 969                                 // The reason is that the `ReturnLabel' is declared between
 970                                 // resolution and emission
 971                                 //
 972                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 973                         }
 974
 975                         if (!InIterator && !HasReturnLabel)
 976                                 HasReturnLabel = true;
 977                 }
 978
 979
 980                 public Expression GetThis (Location loc)
 981                 {
 982                         This my_this;
 983                         if (CurrentBlock != null)
 984                                 my_this = new This (CurrentBlock, loc);
 985                         else
 986                                 my_this = new This (loc);
 987
 988                         if (!my_this.ResolveBase (this))
 989                                 my_this = null;
 990
 991                         return my_this;
 992                 }
 993         }
 994
 995
 996         public abstract class CommonAssemblyModulClass : Attributable, IResolveContext {
 997
 998                 protected CommonAssemblyModulClass ():
 999                         base (null)
1000                 {
1001                 }
1002
1003                 public void AddAttributes (ArrayList attrs)
1004                 {
1005                         foreach (Attribute a in attrs)
1006                                 a.AttachTo (this);
1007
1008                         if (attributes == null) {
1009                                 attributes = new Attributes (attrs);
1010                                 return;
1011                         }
1012                         attributes.AddAttributes (attrs);
1013                 }
1014
1015                 public virtual void Emit (TypeContainer tc)
1016                 {
1017                         if (OptAttributes == null)
1018                                 return;
1019
1020                         OptAttributes.Emit ();
1021                 }
1022
1023                 protected Attribute ResolveAttribute (Type a_type)
1024                 {
1025                         Attribute a = OptAttributes.Search (a_type);
1026                         if (a != null) {
1027                                 a.Resolve ();
1028                         }
1029                         return a;
1030                 }
1031
1032                 public override IResolveContext ResolveContext {
1033                         get { return this; }
1034                 }
1035
1036                 #region IResolveContext Members
1037
1038                 public DeclSpace DeclContainer {
1039                         get { return RootContext.ToplevelTypes; }
1040                 }
1041
1042                 public DeclSpace GenericDeclContainer {
1043                         get { return DeclContainer; }
1044                 }
1045
1046                 public bool IsInObsoleteScope {
1047                         get { return false; }
1048                 }
1049
1050                 public bool IsInUnsafeScope {
1051                         get { return false; }
1052                 }
1053
1054                 #endregion
1055         }
1056
1057         public class AssemblyClass : CommonAssemblyModulClass {
1058                 // TODO: make it private and move all builder based methods here
1059                 public AssemblyBuilder Builder;
1060                 bool is_cls_compliant;
1061                 bool wrap_non_exception_throws;
1062
1063                 public Attribute ClsCompliantAttribute;
1064
1065                 ListDictionary declarative_security;
1066 #if GMCS_SOURCE
1067                 bool has_extension_method;
1068                 public AssemblyName Name;
1069                 MethodInfo add_type_forwarder;
1070                 ListDictionary emitted_forwarders;
1071 #endif
1072
1073                 // Module is here just because of error messages
1074                 static string[] attribute_targets = new string [] { "assembly", "module" };
1075
1076                 public AssemblyClass (): base ()
1077                 {
1078 #if GMCS_SOURCE
1079                         wrap_non_exception_throws = true;
1080 #endif
1081                 }
1082
1083                 public bool HasExtensionMethods {
1084                         set {
1085 #if GMCS_SOURCE
1086                                 has_extension_method = value;
1087 #endif
1088                         }
1089                 }
1090
1091                 public bool IsClsCompliant {
1092                         get {
1093                                 return is_cls_compliant;
1094                         }
1095                 }
1096
1097                 public bool WrapNonExceptionThrows {
1098                         get {
1099                                 return wrap_non_exception_throws;
1100                         }
1101                 }
1102
1103                 public override AttributeTargets AttributeTargets {
1104                         get {
1105                                 return AttributeTargets.Assembly;
1106                         }
1107                 }
1108
1109                 public override bool IsClsComplianceRequired ()
1110                 {
1111                         return is_cls_compliant;
1112                 }
1113
1114                 public void Resolve ()
1115                 {
1116                         if (OptAttributes == null)
1117                                 return;
1118
1119                         // Ensure that we only have GlobalAttributes, since the Search isn't safe with other types.
1120                         if (!OptAttributes.CheckTargets())
1121                                 return;
1122
1123                         ClsCompliantAttribute = ResolveAttribute (TypeManager.cls_compliant_attribute_type);
1124                         if (ClsCompliantAttribute != null) {
1125                                 is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue ();
1126                         }
1127
1128 #if GMCS_SOURCE
1129                         Attribute a = ResolveAttribute (TypeManager.runtime_compatibility_attr_type);
1130                         if (a != null) {
1131                                 object val = a.GetPropertyValue ("WrapNonExceptionThrows");
1132                                 if (val != null)
1133                                         wrap_non_exception_throws = (bool)val;
1134                         }
1135 #endif
1136                 }
1137
1138                 // fix bug #56621
1139                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1140                 {
1141                         try {
1142                                 // check for possible ECMA key
1143                                 if (strongNameBlob.Length == 16) {
1144                                         // will be rejected if not "the" ECMA key
1145                                         an.SetPublicKey (strongNameBlob);
1146                                 }
1147                                 else {
1148                                         // take it, with or without, a private key
1149                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1150                                         // and make sure we only feed the public part to Sys.Ref
1151                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1152
1153                                         // AssemblyName.SetPublicKey requires an additional header
1154                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1155
1156                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1157                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1158                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1159                                         an.SetPublicKey (encodedPublicKey);
1160                                 }
1161                         }
1162                         catch (Exception) {
1163                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
1164                                 Environment.Exit (1);
1165                         }
1166                 }
1167
1168                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1169                 public AssemblyName GetAssemblyName (string name, string output)
1170                 {
1171                         if (OptAttributes != null) {
1172                                 foreach (Attribute a in OptAttributes.Attrs) {
1173                                         // cannot rely on any resolve-based members before you call Resolve
1174                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1175                                                 continue;
1176
1177                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
1178                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
1179                                         //       are loaded yet.
1180                                         // TODO: Does not handle quoted attributes properly
1181                                         switch (a.Name) {
1182                                                 case "AssemblyKeyFile":
1183                                                 case "AssemblyKeyFileAttribute":
1184                                                 case "System.Reflection.AssemblyKeyFileAttribute":
1185                                                         if (RootContext.StrongNameKeyFile != null) {
1186                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1187                                                                 Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1188                                     "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1189                                                         }
1190                                                         else {
1191                                                                 string value = a.GetString ();
1192                                                                 if (value.Length != 0)
1193                                                                         RootContext.StrongNameKeyFile = value;
1194                                                         }
1195                                                         break;
1196                                                 case "AssemblyKeyName":
1197                                                 case "AssemblyKeyNameAttribute":
1198                                                 case "System.Reflection.AssemblyKeyNameAttribute":
1199                                                         if (RootContext.StrongNameKeyContainer != null) {
1200                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1201                                                                 Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1202                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
1203                                                         }
1204                                                         else {
1205                                                                 string value = a.GetString ();
1206                                                                 if (value.Length != 0)
1207                                                                         RootContext.StrongNameKeyContainer = value;
1208                                                         }
1209                                                         break;
1210                                                 case "AssemblyDelaySign":
1211                                                 case "AssemblyDelaySignAttribute":
1212                                                 case "System.Reflection.AssemblyDelaySignAttribute":
1213                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1214                                                         break;
1215                                         }
1216                                 }
1217                         }
1218
1219                         AssemblyName an = new AssemblyName ();
1220                         an.Name = Path.GetFileNameWithoutExtension (name);
1221
1222                         // note: delay doesn't apply when using a key container
1223                         if (RootContext.StrongNameKeyContainer != null) {
1224                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1225                                 return an;
1226                         }
1227
1228                         // strongname is optional
1229                         if (RootContext.StrongNameKeyFile == null)
1230                                 return an;
1231
1232                         string AssemblyDir = Path.GetDirectoryName (output);
1233
1234                         // the StrongName key file may be relative to (a) the compiled
1235                         // file or (b) to the output assembly. See bugzilla #55320
1236                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1237
1238                         // (a) relative to the compiled file
1239                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1240                         bool exist = File.Exists (filename);
1241                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1242                                 // (b) relative to the outputed assembly
1243                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1244                                 exist = File.Exists (filename);
1245                         }
1246
1247                         if (exist) {
1248                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1249                                         byte[] snkeypair = new byte [fs.Length];
1250                                         fs.Read (snkeypair, 0, snkeypair.Length);
1251
1252                                         if (RootContext.StrongNameDelaySign) {
1253                                                 // delayed signing - DO NOT include private key
1254                                                 SetPublicKey (an, snkeypair);
1255                                         }
1256                                         else {
1257                                                 // no delay so we make sure we have the private key
1258                                                 try {
1259                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1260                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1261                                                 }
1262                                                 catch (CryptographicException) {
1263                                                         if (snkeypair.Length == 16) {
1264                                                                 // error # is different for ECMA key
1265                                                                 Report.Error (1606, "Could not sign the assembly. " +
1266                                                                         "ECMA key can only be used to delay-sign assemblies");
1267                                                         }
1268                                                         else {
1269                                                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not have a private key");
1270                                                         }
1271                                                         return null;
1272                                                 }
1273                                         }
1274                                 }
1275                         }
1276                         else {
1277                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not exist");
1278                                 return null;
1279                         }
1280                         return an;
1281                 }
1282
1283                 void Error_AssemblySigning (string text)
1284                 {
1285                         Report.Error (1548, "Error during assembly signing. " + text);
1286                 }
1287
1288 #if GMCS_SOURCE
1289                 bool CheckInternalsVisibleAttribute (Attribute a)
1290                 {
1291                         string assembly_name = a.GetString ();
1292                         if (assembly_name.Length == 0)
1293                                 return false;
1294
1295                         AssemblyName aname = null;
1296                         try {
1297                                 aname = new AssemblyName (assembly_name);
1298                         } catch (FileLoadException) {
1299                         } catch (ArgumentException) {
1300                         }
1301
1302                         // Bad assembly name format
1303                         if (aname == null)
1304                                 Report.Warning (1700, 3, a.Location, "Assembly reference `" + assembly_name + "' is invalid and cannot be resolved");
1305                         // Report error if we have defined Version or Culture
1306                         else if (aname.Version != null || aname.CultureInfo != null)
1307                                 throw new Exception ("Friend assembly `" + a.GetString () +
1308                                                 "' is invalid. InternalsVisibleTo cannot have version or culture specified.");
1309                         else if (aname.GetPublicKey () == null && Name.GetPublicKey () != null) {
1310                                 Report.Error (1726, a.Location, "Friend assembly reference `" + aname.FullName + "' is invalid." +
1311                                                 " Strong named assemblies must specify a public key in their InternalsVisibleTo declarations");
1312                                 return false;
1313                         }
1314
1315                         return true;
1316                 }
1317 #endif
1318
1319                 static bool IsValidAssemblyVersion (string version)
1320                 {
1321                         Version v;
1322                         try {
1323                                 v = new Version (version);
1324                         } catch {
1325                                 try {
1326                                         int major = int.Parse (version, CultureInfo.InvariantCulture);
1327                                         v = new Version (major, 0);
1328                                 } catch {
1329                                         return false;
1330                                 }
1331                         }
1332
1333                         foreach (int candidate in new int [] { v.Major, v.Minor, v.Build, v.Revision }) {
1334                                 if (candidate > ushort.MaxValue)
1335                                         return false;
1336                         }
1337
1338                         return true;
1339                 }
1340
1341                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1342                 {
1343                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1344                                 if (declarative_security == null)
1345                                         declarative_security = new ListDictionary ();
1346
1347                                 a.ExtractSecurityPermissionSet (declarative_security);
1348                                 return;
1349                         }
1350
1351                         if (a.Type == TypeManager.assembly_culture_attribute_type) {
1352                                 string value = a.GetString ();
1353                                 if (value == null || value.Length == 0)
1354                                         return;
1355
1356                                 if (RootContext.Target == Target.Exe) {
1357                                         a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
1358                                         return;
1359                                 }
1360                         }
1361
1362                         if (a.Type == TypeManager.assembly_version_attribute_type) {
1363                                 string value = a.GetString ();
1364                                 if (value == null || value.Length == 0)
1365                                         return;
1366
1367                                 value = value.Replace ('*', '0');
1368
1369                                 if (!IsValidAssemblyVersion (value)) {
1370                                         a.Error_AttributeEmitError (string.Format ("Specified version `{0}' is not valid", value));
1371                                         return;
1372                                 }
1373                         }
1374
1375 #if GMCS_SOURCE
1376                         if (a.Type == TypeManager.internals_visible_attr_type && !CheckInternalsVisibleAttribute (a))
1377                                 return;
1378
1379                         if (a.Type == TypeManager.type_forwarder_attr_type) {
1380                                 Type t = a.GetArgumentType ();
1381                                 if (t == null || TypeManager.HasElementType (t)) {
1382                                         Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
1383                                         return;
1384                                 }
1385
1386                                 if (emitted_forwarders == null) {
1387                                         emitted_forwarders = new ListDictionary();
1388                                 } else if (emitted_forwarders.Contains(t)) {
1389                                         Report.SymbolRelatedToPreviousError(((Attribute)emitted_forwarders[t]).Location, null);
1390                                         Report.Error(739, a.Location, "A duplicate type forward of type `{0}'",
1391                                                 TypeManager.CSharpName(t));
1392                                         return;
1393                                 }
1394
1395                                 emitted_forwarders.Add(t, a);
1396
1397                                 if (TypeManager.LookupDeclSpace (t) != null) {
1398                                         Report.SymbolRelatedToPreviousError (t);
1399                                         Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
1400                                                 TypeManager.CSharpName (t));
1401                                         return;
1402                                 }
1403
1404                                 if (t.IsNested) {
1405                                         Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
1406                                                 TypeManager.CSharpName (t));
1407                                         return;
1408                                 }
1409
1410                                 if (t.IsGenericType) {
1411                                         Report.Error (733, a.Location, "Cannot forward generic type `{0}'", TypeManager.CSharpName (t));
1412                                         return;
1413                                 }
1414
1415                                 if (add_type_forwarder == null) {
1416                                         add_type_forwarder = typeof (AssemblyBuilder).GetMethod ("AddTypeForwarder",
1417                                                 BindingFlags.NonPublic | BindingFlags.Instance);
1418
1419                                         if (add_type_forwarder == null) {
1420                                                 Report.RuntimeMissingSupport (a.Location, "TypeForwardedTo attribute");
1421                                                 return;
1422                                         }
1423                                 }
1424
1425                                 add_type_forwarder.Invoke (Builder, new object[] { t });
1426                                 return;
1427                         }
1428
1429                         if (a.Type == TypeManager.extension_attribute_type) {
1430                                 a.Error_MisusedExtensionAttribute ();
1431                                 return;
1432                         }
1433 #endif
1434                         Builder.SetCustomAttribute (customBuilder);
1435                 }
1436
1437                 public override void Emit (TypeContainer tc)
1438                 {
1439                         base.Emit (tc);
1440
1441 #if GMCS_SOURCE
1442                         if (has_extension_method)
1443                                 Builder.SetCustomAttribute (TypeManager.extension_attribute_attr);
1444
1445                         // FIXME: Does this belong inside SRE.AssemblyBuilder instead?
1446                         if (OptAttributes == null || !OptAttributes.Contains (TypeManager.runtime_compatibility_attr_type)) {
1447                                 ConstructorInfo ci = TypeManager.GetConstructor (
1448                                         TypeManager.runtime_compatibility_attr_type, Type.EmptyTypes);
1449                                 PropertyInfo [] pis = new PropertyInfo [1];
1450                                 pis [0] = TypeManager.GetProperty (
1451                                         TypeManager.runtime_compatibility_attr_type, "WrapNonExceptionThrows");
1452                                 object [] pargs = new object [1];
1453                                 pargs [0] = true;
1454                                 Builder.SetCustomAttribute (new CustomAttributeBuilder (ci, new object [0], pis, pargs));
1455                         }
1456 #endif
1457
1458                         if (declarative_security != null) {
1459
1460                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1461                                 object builder_instance = Builder;
1462
1463                                 try {
1464                                         // Microsoft runtime hacking
1465                                         if (add_permission == null) {
1466                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1467                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1468
1469                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1470                                                 builder_instance = fi.GetValue (Builder);
1471                                         }
1472
1473                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1474                                                                                                   declarative_security [SecurityAction.RequestOptional],
1475                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1476                                         add_permission.Invoke (builder_instance, args);
1477                                 }
1478                                 catch {
1479                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1480                                 }
1481                         }
1482                 }
1483
1484                 public override string[] ValidAttributeTargets {
1485                         get {
1486                                 return attribute_targets;
1487                         }
1488                 }
1489
1490                 // Wrapper for AssemblyBuilder.AddModule
1491                 static MethodInfo adder_method;
1492                 static public MethodInfo AddModule_Method {
1493                         get {
1494                                 if (adder_method == null)
1495                                         adder_method = typeof (AssemblyBuilder).GetMethod ("AddModule", BindingFlags.Instance|BindingFlags.NonPublic);
1496                                 return adder_method;
1497                         }
1498                 }
1499                 public Module AddModule (string module)
1500                 {
1501                         MethodInfo m = AddModule_Method;
1502                         if (m == null) {
1503                                 Report.RuntimeMissingSupport (Location.Null, "/addmodule");
1504                                 Environment.Exit (1);
1505                         }
1506
1507                         try {
1508                                 return (Module) m.Invoke (Builder, new object [] { module });
1509                         } catch (TargetInvocationException ex) {
1510                                 throw ex.InnerException;
1511                         }
1512                 }
1513         }
1514
1515         public class ModuleClass : CommonAssemblyModulClass {
1516                 // TODO: make it private and move all builder based methods here
1517                 public ModuleBuilder Builder;
1518                 bool m_module_is_unsafe;
1519                 bool has_default_charset;
1520
1521                 public CharSet DefaultCharSet = CharSet.Ansi;
1522                 public TypeAttributes DefaultCharSetType = TypeAttributes.AnsiClass;
1523
1524                 static string[] attribute_targets = new string [] { "module" };
1525
1526                 public ModuleClass (bool is_unsafe)
1527                 {
1528                         m_module_is_unsafe = is_unsafe;
1529                 }
1530
1531                 public override AttributeTargets AttributeTargets {
1532                         get {
1533                                 return AttributeTargets.Module;
1534                         }
1535                 }
1536
1537                 public override bool IsClsComplianceRequired ()
1538                 {
1539                         return CodeGen.Assembly.IsClsCompliant;
1540                 }
1541
1542                 public override void Emit (TypeContainer tc)
1543                 {
1544                         base.Emit (tc);
1545
1546                         if (!m_module_is_unsafe)
1547                                 return;
1548
1549                         if (TypeManager.unverifiable_code_ctor == null) {
1550                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1551                                 return;
1552                         }
1553
1554                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1555                 }
1556
1557                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1558                 {
1559                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1560                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1561                                         Report.Warning (3012, 1, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1562                                 }
1563                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1564                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.GetSignatureForError ());
1565                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1566                                         return;
1567                                 }
1568                         }
1569
1570                         Builder.SetCustomAttribute (customBuilder);
1571                 }
1572
1573                 public bool HasDefaultCharSet {
1574                         get {
1575                                 return has_default_charset;
1576                         }
1577                 }
1578
1579                 /// <summary>
1580                 /// It is called very early therefore can resolve only predefined attributes
1581                 /// </summary>
1582                 public void Resolve ()
1583                 {
1584 #if GMCS_SOURCE
1585                         if (OptAttributes == null)
1586                                 return;
1587
1588                         if (!OptAttributes.CheckTargets())
1589                                 return;
1590
1591                         Attribute a = ResolveAttribute (TypeManager.default_charset_type);
1592                         if (a != null) {
1593                                 has_default_charset = true;
1594                                 DefaultCharSet = a.GetCharSetValue ();
1595                                 switch (DefaultCharSet) {
1596                                         case CharSet.Ansi:
1597                                         case CharSet.None:
1598                                                 break;
1599                                         case CharSet.Auto:
1600                                                 DefaultCharSetType = TypeAttributes.AutoClass;
1601                                                 break;
1602                                         case CharSet.Unicode:
1603                                                 DefaultCharSetType = TypeAttributes.UnicodeClass;
1604                                                 break;
1605                                         default:
1606                                                 Report.Error (1724, a.Location, "Value specified for the argument to 'System.Runtime.InteropServices.DefaultCharSetAttribute' is not valid");
1607                                                 break;
1608                                 }
1609                         }
1610 #endif
1611                 }
1612
1613                 public override string[] ValidAttributeTargets {
1614                         get {
1615                                 return attribute_targets;
1616                         }
1617                 }
1618         }
1619 }