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 #if MS_COMPATIBLE
 134                                 const AssemblyBuilderAccess COMPILER_ACCESS = 0;
 135 #else
 136                                 /* Keep this in sync with System.Reflection.Emit.AssemblyBuilder */
 137                                 const AssemblyBuilderAccess COMPILER_ACCESS = (AssemblyBuilderAccess) 0x800;
 138 #endif
 139
 140                                 Assembly.Builder = current_domain.DefineDynamicAssembly (an,
 141                                         AssemblyBuilderAccess.Save | COMPILER_ACCESS, Dirname (name));
 142                         }
 143                         catch (ArgumentException) {
 144                                 // specified key may not be exportable outside it's container
 145                                 if (RootContext.StrongNameKeyContainer != null) {
 146                                         Report.Error (1548, "Could not access the key inside the container `" +
 147                                                 RootContext.StrongNameKeyContainer + "'.");
 148                                         Environment.Exit (1);
 149                                 }
 150                                 throw;
 151                         }
 152                         catch (CryptographicException) {
 153                                 if ((RootContext.StrongNameKeyContainer != null) || (RootContext.StrongNameKeyFile != null)) {
 154                                         Report.Error (1548, "Could not use the specified key to strongname the assembly.");
 155                                         Environment.Exit (1);
 156                                 }
 157                                 return false;
 158                         }
 159
 160 #if GMCS_SOURCE
 161                         // Get the complete AssemblyName from the builder
 162                         // (We need to get the public key and token)
 163                         Assembly.Name = Assembly.Builder.GetName ();
 164 #endif
 165
 166                         //
 167                         // Pass a path-less name to DefineDynamicModule.  Wonder how
 168                         // this copes with output in different directories then.
 169                         // FIXME: figure out how this copes with --output /tmp/blah
 170                         //
 171                         // If the third argument is true, the ModuleBuilder will dynamically
 172                         // load the default symbol writer.
 173                         //
 174                         Module.Builder = Assembly.Builder.DefineDynamicModule (
 175                                 Basename (name), Basename (output), false);
 176
 177                         if (want_debugging_support)
 178                                 InitializeSymbolWriter (output);
 179
 180                         return true;
 181                 }
 182
 183                 static public void Save (string name)
 184                 {
 185                         try {
 186                                 Assembly.Builder.Save (Basename (name));
 187
 188                                 if (SymbolWriter != null)
 189                                         SymbolWriter.WriteSymbolFile ();
 190                         }
 191                         catch (COMException) {
 192                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 193                                         throw;
 194
 195                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 196                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 197                                         RootContext.StrongNameKeyFile +
 198                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 199                         }
 200                         catch (System.IO.IOException io) {
 201                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 202                         }
 203                         catch (System.UnauthorizedAccessException ua) {
 204                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + ua.Message);
 205                         }
 206                 }
 207         }
 208
 209
 210         public interface IResolveContext
 211         {
 212                 DeclSpace DeclContainer { get; }
 213                 bool IsInObsoleteScope { get; }
 214                 bool IsInUnsafeScope { get; }
 215
 216                 // the declcontainer to lookup for type-parameters.  Should only use LookupGeneric on it.
 217                 //
 218                 // FIXME: This is somewhat of a hack.  We don't need a full DeclSpace for this.  We just need the
 219                 //        current type parameters in scope. IUIC, that will require us to rewrite GenericMethod.
 220                 //        Maybe we can replace this with a 'LookupGeneric (string)' instead, but we'll have to
 221                 //        handle generic method overrides differently
 222                 DeclSpace GenericDeclContainer { get; }
 223         }
 224
 225         /// <summary>
 226         ///   An Emit Context is created for each body of code (from methods,
 227         ///   properties bodies, indexer bodies or constructor bodies)
 228         /// </summary>
 229         public class EmitContext : IResolveContext {
 230
 231                 //
 232                 // Holds a varible used during collection or object initialization.
 233                 //
 234                 public Expression CurrentInitializerVariable;
 235
 236                 DeclSpace decl_space;
 237
 238                 public DeclSpace TypeContainer;
 239                 public ILGenerator ig;
 240
 241                 [Flags]
 242                 public enum Flags : int {
 243                         /// <summary>
 244                         ///   This flag tracks the `checked' state of the compilation,
 245                         ///   it controls whether we should generate code that does overflow
 246                         ///   checking, or if we generate code that ignores overflows.
 247                         ///
 248                         ///   The default setting comes from the command line option to generate
 249                         ///   checked or unchecked code plus any source code changes using the
 250                         ///   checked/unchecked statements or expressions.   Contrast this with
 251                         ///   the ConstantCheckState flag.
 252                         /// </summary>
 253                         CheckState = 1 << 0,
 254
 255                         /// <summary>
 256                         ///   The constant check state is always set to `true' and cant be changed
 257                         ///   from the command line.  The source code can change this setting with
 258                         ///   the `checked' and `unchecked' statements and expressions.
 259                         /// </summary>
 260                         ConstantCheckState = 1 << 1,
 261
 262                         AllCheckStateFlags = CheckState | ConstantCheckState,
 263
 264                         /// <summary>
 265                         ///  Whether we are inside an unsafe block
 266                         /// </summary>
 267                         InUnsafe = 1 << 2,
 268
 269                         InCatch = 1 << 3,
 270                         InFinally = 1 << 4,
 271
 272                         /// <summary>
 273                         ///   Whether control flow analysis is enabled
 274                         /// </summary>
 275                         DoFlowAnalysis = 1 << 5,
 276
 277                         /// <summary>
 278                         ///   Whether control flow analysis is disabled on structs
 279                         ///   (only meaningful when DoFlowAnalysis is set)
 280                         /// </summary>
 281                         OmitStructFlowAnalysis = 1 << 6,
 282
 283                         ///
 284                         /// Indicates the current context is in probing mode, no errors are reported.
 285                         ///
 286                         ProbingMode = 1 <<      7,
 287
 288                         //
 289                         // Inside field intializer expression
 290                         //
 291                         InFieldInitializer = 1 << 8,
 292
 293                         InferReturnType = 1 << 9,
 294
 295                         InCompoundAssignment = 1 << 10
 296                 }
 297
 298                 Flags flags;
 299
 300                 /// <summary>
 301                 ///   Whether we are emitting code inside a static or instance method
 302                 /// </summary>
 303                 public bool IsStatic;
 304
 305                 /// <summary>
 306                 ///   Whether the actual created method is static or instance method.
 307                 ///   Althoug the method might be declared as `static', if an anonymous
 308                 ///   method is involved, we might turn this into an instance method.
 309                 ///
 310                 ///   So this reflects the low-level staticness of the method, while
 311                 ///   IsStatic represents the semantic, high-level staticness.
 312                 /// </summary>
 313                 public bool MethodIsStatic;
 314
 315                 /// <summary>
 316                 ///   The value that is allowed to be returned or NULL if there is no
 317                 ///   return type.
 318                 /// </summary>
 319                 Type return_type;
 320
 321                 /// <summary>
 322                 ///   Points to the Type (extracted from the TypeContainer) that
 323                 ///   declares this body of code
 324                 /// </summary>
 325                 public readonly Type ContainerType;
 326
 327                 /// <summary>
 328                 ///   Whether this is generating code for a constructor
 329                 /// </summary>
 330                 public bool IsConstructor;
 331
 332                 /// <summary>
 333                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 334                 ///   to store structures (used to compute the address of the structure
 335                 ///   value on structure method invocations)
 336                 /// </summary>
 337                 public Hashtable temporary_storage;
 338
 339                 public Block CurrentBlock;
 340
 341                 public int CurrentFile;
 342
 343                 /// <summary>
 344                 ///   The location where we store the return value.
 345                 /// </summary>
 346                 LocalBuilder return_value;
 347
 348                 /// <summary>
 349                 ///   The location where return has to jump to return the
 350                 ///   value
 351                 /// </summary>
 352                 public Label ReturnLabel;
 353
 354                 /// <summary>
 355                 ///   If we already defined the ReturnLabel
 356                 /// </summary>
 357                 public bool HasReturnLabel;
 358
 359                 /// <summary>
 360                 ///   Whether we are inside an iterator block.
 361                 /// </summary>
 362                 public bool InIterator;
 363
 364                 /// <summary>
 365                 ///  Whether we are in a `fixed' initialization
 366                 /// </summary>
 367                 public bool InFixedInitializer;
 368
 369                 /// <summary>
 370                 ///  Whether we are inside an anonymous method.
 371                 /// </summary>
 372                 public AnonymousContainer CurrentAnonymousMethod;
 373
 374                 /// <summary>
 375                 ///   Location for this EmitContext
 376                 /// </summary>
 377                 public Location loc;
 378
 379                 /// <summary>
 380                 ///   Inside an enum definition, we do not resolve enumeration values
 381                 ///   to their enumerations, but rather to the underlying type/value
 382                 ///   This is so EnumVal + EnumValB can be evaluated.
 383                 ///
 384                 ///   There is no "E operator + (E x, E y)", so during an enum evaluation
 385                 ///   we relax the rules
 386                 /// </summary>
 387                 public bool InEnumContext;
 388
 389                 public readonly IResolveContext ResolveContext;
 390
 391                 /// <summary>
 392                 ///    The current iterator
 393                 /// </summary>
 394                 public Iterator CurrentIterator {
 395                         get { return CurrentAnonymousMethod as Iterator; }
 396                 }
 397
 398                 /// <summary>
 399                 ///    Whether we are in the resolving stage or not
 400                 /// </summary>
 401                 enum Phase {
 402                         Created,
 403                         Resolving,
 404                         Emitting
 405                 }
 406
 407                 public static EmitContext TempEc;
 408
 409                 bool isAnonymousMethodAllowed = true;
 410
 411                 Phase current_phase;
 412                 FlowBranching current_flow_branching;
 413
 414                 static int next_id = 0;
 415                 int id = ++next_id;
 416
 417                 public override string ToString ()
 418                 {
 419                         return String.Format ("EmitContext ({0}:{1})", id,
 420                                               CurrentAnonymousMethod, loc);
 421                 }
 422
 423                 public EmitContext (IResolveContext rc, DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 424                                     Type return_type, int code_flags, bool is_constructor)
 425                 {
 426                         this.ResolveContext = rc;
 427                         this.ig = ig;
 428
 429                         TypeContainer = parent;
 430                         this.decl_space = ds;
 431                         if (RootContext.Checked)
 432                                 flags |= Flags.CheckState;
 433                         flags |= Flags.ConstantCheckState;
 434
 435                         if (return_type == null)
 436                                 throw new ArgumentNullException ("return_type");
 437 #if GMCS_SOURCE
 438                         if ((return_type is TypeBuilder) && return_type.IsGenericTypeDefinition)
 439                                 throw new InternalErrorException ();
 440 #endif
 441
 442                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 443                         MethodIsStatic = IsStatic;
 444                         InIterator = (code_flags & Modifiers.METHOD_YIELDS) != 0;
 445                         ReturnType = return_type;
 446                         IsConstructor = is_constructor;
 447                         CurrentBlock = null;
 448                         CurrentFile = 0;
 449                         current_phase = Phase.Created;
 450
 451                         if (parent != null){
 452                                 // Can only be null for the ResolveType contexts.
 453                                 ContainerType = parent.TypeBuilder;
 454                                 if (rc.IsInUnsafeScope)
 455                                         flags |= Flags.InUnsafe;
 456                         }
 457                         loc = l;
 458                 }
 459
 460                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 461                                     Type return_type, int code_flags, bool is_constructor)
 462                         : this (rc, ds, ds, l, ig, return_type, code_flags, is_constructor)
 463                 {
 464                 }
 465
 466                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 467                                     Type return_type, int code_flags)
 468                         : this (rc, ds, ds, l, ig, return_type, code_flags, false)
 469                 {
 470                 }
 471
 472                 public DeclSpace DeclContainer {
 473                         get { return decl_space; }
 474                         set { decl_space = value; }
 475                 }
 476
 477                 public DeclSpace GenericDeclContainer {
 478                         get { return DeclContainer; }
 479                 }
 480
 481                 public bool CheckState {
 482                         get { return (flags & Flags.CheckState) != 0; }
 483                 }
 484
 485                 public bool ConstantCheckState {
 486                         get { return (flags & Flags.ConstantCheckState) != 0; }
 487                 }
 488
 489                 public bool InUnsafe {
 490                         get { return (flags & Flags.InUnsafe) != 0; }
 491                 }
 492
 493                 public bool InCatch {
 494                         get { return (flags & Flags.InCatch) != 0; }
 495                 }
 496
 497                 public bool InFinally {
 498                         get { return (flags & Flags.InFinally) != 0; }
 499                 }
 500
 501                 public bool DoFlowAnalysis {
 502                         get { return (flags & Flags.DoFlowAnalysis) != 0; }
 503                 }
 504
 505                 public bool OmitStructFlowAnalysis {
 506                         get { return (flags & Flags.OmitStructFlowAnalysis) != 0; }
 507                 }
 508
 509                 // utility helper for CheckExpr, UnCheckExpr, Checked and Unchecked statements
 510                 // it's public so that we can use a struct at the callsite
 511                 public struct FlagsHandle : IDisposable
 512                 {
 513                         EmitContext ec;
 514                         readonly Flags invmask, oldval;
 515
 516                         public FlagsHandle (EmitContext ec, Flags flagsToSet)
 517                                 : this (ec, flagsToSet, flagsToSet)
 518                         {
 519                         }
 520
 521                         internal FlagsHandle (EmitContext ec, Flags mask, Flags val)
 522                         {
 523                                 this.ec = ec;
 524                                 invmask = ~mask;
 525                                 oldval = ec.flags & mask;
 526                                 ec.flags = (ec.flags & invmask) | (val & mask);
 527
 528                                 if ((mask & Flags.ProbingMode) != 0)
 529                                         Report.DisableReporting ();
 530                         }
 531
 532                         public void Dispose ()
 533                         {
 534                                 if ((invmask & Flags.ProbingMode) == 0)
 535                                         Report.EnableReporting ();
 536
 537                                 ec.flags = (ec.flags & invmask) | oldval;
 538                         }
 539                 }
 540
 541                 // Temporarily set all the given flags to the given value.  Should be used in an 'using' statement
 542                 public FlagsHandle Set (Flags flagsToSet)
 543                 {
 544                         return new FlagsHandle (this, flagsToSet);
 545                 }
 546
 547                 public FlagsHandle With (Flags bits, bool enable)
 548                 {
 549                         return new FlagsHandle (this, bits, enable ? bits : 0);
 550                 }
 551
 552                 public FlagsHandle WithFlowAnalysis (bool do_flow_analysis, bool omit_struct_analysis)
 553                 {
 554                         Flags newflags =
 555                                 (do_flow_analysis ? Flags.DoFlowAnalysis : 0) |
 556                                 (omit_struct_analysis ? Flags.OmitStructFlowAnalysis : 0);
 557                         return new FlagsHandle (this, Flags.DoFlowAnalysis | Flags.OmitStructFlowAnalysis, newflags);
 558                 }
 559
 560                 /// <summary>
 561                 ///   If this is true, then Return and ContextualReturn statements
 562                 ///   will set the ReturnType value based on the expression types
 563                 ///   of each return statement instead of the method return type
 564                 ///   (which is initially null).
 565                 /// </summary>
 566                 public bool InferReturnType {
 567                         get { return (flags & Flags.InferReturnType) != 0; }
 568                 }
 569
 570                 public bool IsInObsoleteScope {
 571                         get {
 572                                 // Disables obsolete checks when probing is on
 573                                 return IsInProbingMode || ResolveContext.IsInObsoleteScope;
 574                         }
 575                 }
 576
 577                 public bool IsInProbingMode {
 578                         get { return (flags & Flags.ProbingMode) != 0; }
 579                 }
 580
 581                 public bool IsInUnsafeScope {
 582                         get { return InUnsafe || ResolveContext.IsInUnsafeScope; }
 583                 }
 584
 585                 public bool IsAnonymousMethodAllowed {
 586                         get { return isAnonymousMethodAllowed; }
 587                         set { isAnonymousMethodAllowed = value; }
 588                 }
 589
 590                 public bool IsInFieldInitializer {
 591                         get { return (flags & Flags.InFieldInitializer) != 0; }
 592                 }
 593
 594                 public bool IsInCompoundAssignment {
 595                         get { return (flags & Flags.InCompoundAssignment) != 0; }
 596                 }
 597
 598                 public FlowBranching CurrentBranching {
 599                         get { return current_flow_branching; }
 600                 }
 601
 602                 // <summary>
 603                 //   Starts a new code branching.  This inherits the state of all local
 604                 //   variables and parameters from the current branching.
 605                 // </summary>
 606                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 607                 {
 608                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 609                         return current_flow_branching;
 610                 }
 611
 612                 // <summary>
 613                 //   Starts a new code branching for block `block'.
 614                 // </summary>
 615                 public FlowBranching StartFlowBranching (Block block)
 616                 {
 617                         FlowBranching.BranchingType type;
 618
 619                         if ((CurrentBranching != null) &&
 620                             (CurrentBranching.Type == FlowBranching.BranchingType.Switch))
 621                                 type = FlowBranching.BranchingType.SwitchSection;
 622                         else
 623                                 type = FlowBranching.BranchingType.Block;
 624
 625                         flags |= Flags.DoFlowAnalysis;
 626
 627                         current_flow_branching = FlowBranching.CreateBranching (
 628                                 CurrentBranching, type, block, block.StartLocation);
 629                         return current_flow_branching;
 630                 }
 631
 632                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 633                 {
 634                         FlowBranchingException branching = new FlowBranchingException (CurrentBranching, stmt);
 635                         current_flow_branching = branching;
 636                         return branching;
 637                 }
 638
 639                 public FlowBranchingLabeled StartFlowBranching (LabeledStatement stmt)
 640                 {
 641                         FlowBranchingLabeled branching = new FlowBranchingLabeled (CurrentBranching, stmt);
 642                         current_flow_branching = branching;
 643                         return branching;
 644                 }
 645
 646                 public FlowBranchingToplevel StartFlowBranching (ToplevelBlock stmt)
 647                 {
 648                         FlowBranchingToplevel branching = new FlowBranchingToplevel (CurrentBranching, stmt);
 649                         current_flow_branching = branching;
 650                         return branching;
 651                 }
 652
 653                 // <summary>
 654                 //   Ends a code branching.  Merges the state of locals and parameters
 655                 //   from all the children of the ending branching.
 656                 // </summary>
 657                 public FlowBranching.UsageVector DoEndFlowBranching ()
 658                 {
 659                         FlowBranching old = current_flow_branching;
 660                         current_flow_branching = current_flow_branching.Parent;
 661
 662                         return current_flow_branching.MergeChild (old);
 663                 }
 664
 665                 // <summary>
 666                 //   Ends a code branching.  Merges the state of locals and parameters
 667                 //   from all the children of the ending branching.
 668                 // </summary>
 669                 public bool EndFlowBranching ()
 670                 {
 671                         FlowBranching.UsageVector vector = DoEndFlowBranching ();
 672
 673                         return vector.IsUnreachable;
 674                 }
 675
 676                 // <summary>
 677                 //   Kills the current code branching.  This throws away any changed state
 678                 //   information and should only be used in case of an error.
 679                 // </summary>
 680                 public void KillFlowBranching ()
 681                 {
 682                         current_flow_branching = current_flow_branching.Parent;
 683                 }
 684
 685                 public bool MustCaptureVariable (LocalInfo local)
 686                 {
 687                         if (CurrentAnonymousMethod == null)
 688                                 return false;
 689                         if (CurrentAnonymousMethod.IsIterator)
 690                                 return true;
 691                         return local.Block.Toplevel != CurrentBlock.Toplevel;
 692                 }
 693
 694                 public void EmitMeta (ToplevelBlock b)
 695                 {
 696                         b.EmitMeta (this);
 697
 698                         if (HasReturnLabel)
 699                                 ReturnLabel = ig.DefineLabel ();
 700                 }
 701
 702                 //
 703                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 704                 // currently can not cope with ig == null during resolve (which must
 705                 // be fixed for switch statements to work on anonymous methods).
 706                 //
 707                 public void EmitTopBlock (IMethodData md, ToplevelBlock block)
 708                 {
 709                         if (block == null)
 710                                 return;
 711
 712                         bool unreachable;
 713
 714                         if (ResolveTopBlock (null, block, md.ParameterInfo, md, out unreachable)){
 715                                 if (Report.Errors > 0)
 716                                         return;
 717
 718                                 EmitMeta (block);
 719
 720                                 current_phase = Phase.Emitting;
 721                                 EmitResolvedTopBlock (block, unreachable);
 722                         }
 723                 }
 724
 725                 bool resolved;
 726
 727                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 728                                              Parameters ip, IMethodData md, out bool unreachable)
 729                 {
 730                         current_phase = Phase.Resolving;
 731
 732                         unreachable = false;
 733
 734                         if (resolved)
 735                                 return true;
 736
 737                         if (!loc.IsNull)
 738                                 CurrentFile = loc.File;
 739
 740 #if PRODUCTION
 741                         try {
 742 #endif
 743                                 if (!block.ResolveMeta (this, ip))
 744                                         return false;
 745
 746                                 if ((md != null) && (md.Iterator != null)) {
 747                                         if (!md.Iterator.Define (this))
 748                                                 return false;
 749                                 }
 750
 751                                 using (this.With (EmitContext.Flags.DoFlowAnalysis, true)) {
 752                                         FlowBranchingToplevel top_level;
 753                                         if (anonymous_method_host != null)
 754                                                 top_level = new FlowBranchingToplevel (anonymous_method_host.CurrentBranching, block);
 755                                         else
 756                                                 top_level = block.TopLevelBranching;
 757
 758                                         current_flow_branching = top_level;
 759                                         bool ok = block.Resolve (this);
 760                                         current_flow_branching = null;
 761
 762                                         if (!ok)
 763                                                 return false;
 764
 765                                         bool flow_unreachable = top_level.End ();
 766                                         if (flow_unreachable)
 767                                                 unreachable = true;
 768                                 }
 769 #if PRODUCTION
 770                         } catch (Exception e) {
 771                                 Console.WriteLine ("Exception caught by the compiler while compiling:");
 772                                 Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 773
 774                                 if (CurrentBlock != null){
 775                                         Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 776                                                            CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 777                                 }
 778                                 Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 779                                 throw;
 780                         }
 781 #endif
 782
 783                         if (return_type != TypeManager.void_type && !unreachable) {
 784                                 if (CurrentAnonymousMethod == null) {
 785                                         Report.Error (161, md.Location, "`{0}': not all code paths return a value", md.GetSignatureForError ());
 786                                         return false;
 787                                 } else if (!CurrentAnonymousMethod.IsIterator) {
 788                                         Report.Error (1643, CurrentAnonymousMethod.Location, "Not all code paths return a value in anonymous method of type `{0}'",
 789                                                       CurrentAnonymousMethod.GetSignatureForError ());
 790                                         return false;
 791                                 }
 792                         }
 793
 794                         if (!block.CompleteContexts (this))
 795                                 return false;
 796
 797                         resolved = true;
 798                         return true;
 799                 }
 800
 801                 public Type ReturnType {
 802                         set {
 803                                 return_type = value;
 804                         }
 805                         get {
 806                                 return return_type;
 807                         }
 808                 }
 809
 810                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 811                 {
 812                         if (block != null)
 813                                 block.Emit (this);
 814
 815                         if (HasReturnLabel)
 816                                 ig.MarkLabel (ReturnLabel);
 817
 818                         if (return_value != null){
 819                                 ig.Emit (OpCodes.Ldloc, return_value);
 820                                 ig.Emit (OpCodes.Ret);
 821                         } else {
 822                                 //
 823                                 // If `HasReturnLabel' is set, then we already emitted a
 824                                 // jump to the end of the method, so we must emit a `ret'
 825                                 // there.
 826                                 //
 827                                 // Unfortunately, System.Reflection.Emit automatically emits
 828                                 // a leave to the end of a finally block.  This is a problem
 829                                 // if no code is following the try/finally block since we may
 830                                 // jump to a point after the end of the method.
 831                                 // As a workaround, we're always creating a return label in
 832                                 // this case.
 833                                 //
 834
 835                                 bool in_iterator = (CurrentAnonymousMethod != null) &&
 836                                         CurrentAnonymousMethod.IsIterator && InIterator;
 837
 838                                 if ((block != null) && block.IsDestructor) {
 839                                         // Nothing to do; S.R.E automatically emits a leave.
 840                                 } else if (HasReturnLabel || (!unreachable && !in_iterator)) {
 841                                         if (return_type != TypeManager.void_type)
 842                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 843                                         ig.Emit (OpCodes.Ret);
 844                                 }
 845                         }
 846                 }
 847
 848                 /// <summary>
 849                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 850                 ///   writer to which source line this opcode belongs.
 851                 /// </summary>
 852                 public void Mark (Location loc, bool check_file)
 853                 {
 854                         if ((CodeGen.SymbolWriter == null) || loc.IsNull)
 855                                 return;
 856
 857                         if (check_file && (CurrentFile != loc.File))
 858                                 return;
 859
 860                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, loc.Column);
 861                 }
 862
 863                 public void DefineLocalVariable (string name, LocalBuilder builder)
 864                 {
 865                         if (CodeGen.SymbolWriter == null)
 866                                 return;
 867
 868                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 869                 }
 870
 871                 public void BeginScope ()
 872                 {
 873                         ig.BeginScope();
 874
 875                         if (CodeGen.SymbolWriter != null)
 876                                 CodeGen.SymbolWriter.OpenScope(ig);
 877                 }
 878
 879                 public void EndScope ()
 880                 {
 881                         ig.EndScope();
 882
 883                         if (CodeGen.SymbolWriter != null)
 884                                 CodeGen.SymbolWriter.CloseScope(ig);
 885                 }
 886
 887                 /// <summary>
 888                 ///   Returns a temporary storage for a variable of type t as
 889                 ///   a local variable in the current body.
 890                 /// </summary>
 891                 public LocalBuilder GetTemporaryLocal (Type t)
 892                 {
 893                         if (temporary_storage != null) {
 894                                 object o = temporary_storage [t];
 895                                 if (o != null) {
 896                                         if (o is Stack) {
 897                                                 Stack s = (Stack) o;
 898                                                 o = s.Count == 0 ? null : s.Pop ();
 899                                         } else {
 900                                                 temporary_storage.Remove (t);
 901                                         }
 902                                 }
 903                                 if (o != null)
 904                                         return (LocalBuilder) o;
 905                         }
 906                         return ig.DeclareLocal (t);
 907                 }
 908
 909                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 910                 {
 911                         Stack s;
 912
 913                         if (temporary_storage == null) {
 914                                 temporary_storage = new Hashtable ();
 915                                 temporary_storage [t] = b;
 916                                 return;
 917                         }
 918                         object o = temporary_storage [t];
 919                         if (o == null) {
 920                                 temporary_storage [t] = b;
 921                                 return;
 922                         }
 923                         if (o is Stack) {
 924                                 s = (Stack) o;
 925                         } else {
 926                                 s = new Stack ();
 927                                 s.Push (o);
 928                                 temporary_storage [t] = s;
 929                         }
 930                         s.Push (b);
 931                 }
 932
 933                 /// <summary>
 934                 ///   Current loop begin and end labels.
 935                 /// </summary>
 936                 public Label LoopBegin, LoopEnd;
 937
 938                 /// <summary>
 939                 ///   Default target in a switch statement.   Only valid if
 940                 ///   InSwitch is true
 941                 /// </summary>
 942                 public Label DefaultTarget;
 943
 944                 /// <summary>
 945                 ///   If this is non-null, points to the current switch statement
 946                 /// </summary>
 947                 public Switch Switch;
 948
 949                 /// <summary>
 950                 ///   ReturnValue creates on demand the LocalBuilder for the
 951                 ///   return value from the function.  By default this is not
 952                 ///   used.  This is only required when returns are found inside
 953                 ///   Try or Catch statements.
 954                 ///
 955                 ///   This method is typically invoked from the Emit phase, so
 956                 ///   we allow the creation of a return label if it was not
 957                 ///   requested during the resolution phase.   Could be cleaned
 958                 ///   up, but it would replicate a lot of logic in the Emit phase
 959                 ///   of the code that uses it.
 960                 /// </summary>
 961                 public LocalBuilder TemporaryReturn ()
 962                 {
 963                         if (return_value == null){
 964                                 return_value = ig.DeclareLocal (return_type);
 965                                 if (!HasReturnLabel){
 966                                         ReturnLabel = ig.DefineLabel ();
 967                                         HasReturnLabel = true;
 968                                 }
 969                         }
 970
 971                         return return_value;
 972                 }
 973
 974                 /// <summary>
 975                 ///   This method is used during the Resolution phase to flag the
 976                 ///   need to define the ReturnLabel
 977                 /// </summary>
 978                 public void NeedReturnLabel ()
 979                 {
 980                         if (current_phase != Phase.Resolving){
 981                                 //
 982                                 // The reason is that the `ReturnLabel' is declared between
 983                                 // resolution and emission
 984                                 //
 985                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 986                         }
 987
 988                         if (!InIterator && !HasReturnLabel)
 989                                 HasReturnLabel = true;
 990                 }
 991
 992
 993                 public Expression GetThis (Location loc)
 994                 {
 995                         This my_this;
 996                         if (CurrentBlock != null)
 997                                 my_this = new This (CurrentBlock, loc);
 998                         else
 999                                 my_this = new This (loc);
1000
1001                         if (!my_this.ResolveBase (this))
1002                                 my_this = null;
1003
1004                         return my_this;
1005                 }
1006         }
1007
1008
1009         public abstract class CommonAssemblyModulClass : Attributable, IResolveContext {
1010
1011                 protected CommonAssemblyModulClass ():
1012                         base (null)
1013                 {
1014                 }
1015
1016                 public void AddAttributes (ArrayList attrs)
1017                 {
1018                         foreach (Attribute a in attrs)
1019                                 a.AttachTo (this);
1020
1021                         if (attributes == null) {
1022                                 attributes = new Attributes (attrs);
1023                                 return;
1024                         }
1025                         attributes.AddAttributes (attrs);
1026                 }
1027
1028                 public virtual void Emit (TypeContainer tc)
1029                 {
1030                         if (OptAttributes == null)
1031                                 return;
1032
1033                         OptAttributes.Emit ();
1034                 }
1035
1036                 protected Attribute ResolveAttribute (Type a_type)
1037                 {
1038                         Attribute a = OptAttributes.Search (a_type);
1039                         if (a != null) {
1040                                 a.Resolve ();
1041                         }
1042                         return a;
1043                 }
1044
1045                 public override IResolveContext ResolveContext {
1046                         get { return this; }
1047                 }
1048
1049                 #region IResolveContext Members
1050
1051                 public DeclSpace DeclContainer {
1052                         get { return RootContext.ToplevelTypes; }
1053                 }
1054
1055                 public DeclSpace GenericDeclContainer {
1056                         get { return DeclContainer; }
1057                 }
1058
1059                 public bool IsInObsoleteScope {
1060                         get { return false; }
1061                 }
1062
1063                 public bool IsInUnsafeScope {
1064                         get { return false; }
1065                 }
1066
1067                 #endregion
1068         }
1069
1070         public class AssemblyClass : CommonAssemblyModulClass {
1071                 // TODO: make it private and move all builder based methods here
1072                 public AssemblyBuilder Builder;
1073                 bool is_cls_compliant;
1074                 bool wrap_non_exception_throws;
1075
1076                 public Attribute ClsCompliantAttribute;
1077
1078                 ListDictionary declarative_security;
1079 #if GMCS_SOURCE
1080                 bool has_extension_method;
1081                 public AssemblyName Name;
1082                 MethodInfo add_type_forwarder;
1083                 ListDictionary emitted_forwarders;
1084 #endif
1085
1086                 // Module is here just because of error messages
1087                 static string[] attribute_targets = new string [] { "assembly", "module" };
1088
1089                 public AssemblyClass (): base ()
1090                 {
1091 #if GMCS_SOURCE
1092                         wrap_non_exception_throws = true;
1093 #endif
1094                 }
1095
1096                 public bool HasExtensionMethods {
1097                         set {
1098 #if GMCS_SOURCE
1099                                 has_extension_method = value;
1100 #endif
1101                         }
1102                 }
1103
1104                 public bool IsClsCompliant {
1105                         get {
1106                                 return is_cls_compliant;
1107                         }
1108                 }
1109
1110                 public bool WrapNonExceptionThrows {
1111                         get {
1112                                 return wrap_non_exception_throws;
1113                         }
1114                 }
1115
1116                 public override AttributeTargets AttributeTargets {
1117                         get {
1118                                 return AttributeTargets.Assembly;
1119                         }
1120                 }
1121
1122                 public override bool IsClsComplianceRequired ()
1123                 {
1124                         return is_cls_compliant;
1125                 }
1126
1127                 public void Resolve ()
1128                 {
1129                         if (OptAttributes == null)
1130                                 return;
1131
1132                         // Ensure that we only have GlobalAttributes, since the Search isn't safe with other types.
1133                         if (!OptAttributes.CheckTargets())
1134                                 return;
1135
1136                         ClsCompliantAttribute = ResolveAttribute (TypeManager.cls_compliant_attribute_type);
1137                         if (ClsCompliantAttribute != null) {
1138                                 is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue ();
1139                         }
1140
1141 #if GMCS_SOURCE
1142                         Attribute a = ResolveAttribute (TypeManager.runtime_compatibility_attr_type);
1143                         if (a != null) {
1144                                 object val = a.GetPropertyValue ("WrapNonExceptionThrows");
1145                                 if (val != null)
1146                                         wrap_non_exception_throws = (bool)val;
1147                         }
1148 #endif
1149                 }
1150
1151                 // fix bug #56621
1152                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1153                 {
1154                         try {
1155                                 // check for possible ECMA key
1156                                 if (strongNameBlob.Length == 16) {
1157                                         // will be rejected if not "the" ECMA key
1158                                         an.SetPublicKey (strongNameBlob);
1159                                 }
1160                                 else {
1161                                         // take it, with or without, a private key
1162                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1163                                         // and make sure we only feed the public part to Sys.Ref
1164                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1165
1166                                         // AssemblyName.SetPublicKey requires an additional header
1167                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1168
1169                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1170                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1171                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1172                                         an.SetPublicKey (encodedPublicKey);
1173                                 }
1174                         }
1175                         catch (Exception) {
1176                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
1177                                 Environment.Exit (1);
1178                         }
1179                 }
1180
1181                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1182                 public AssemblyName GetAssemblyName (string name, string output)
1183                 {
1184                         if (OptAttributes != null) {
1185                                 foreach (Attribute a in OptAttributes.Attrs) {
1186                                         // cannot rely on any resolve-based members before you call Resolve
1187                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1188                                                 continue;
1189
1190                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
1191                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
1192                                         //       are loaded yet.
1193                                         // TODO: Does not handle quoted attributes properly
1194                                         switch (a.Name) {
1195                                                 case "AssemblyKeyFile":
1196                                                 case "AssemblyKeyFileAttribute":
1197                                                 case "System.Reflection.AssemblyKeyFileAttribute":
1198                                                         if (RootContext.StrongNameKeyFile != null) {
1199                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1200                                                                 Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1201                                     "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1202                                                         }
1203                                                         else {
1204                                                                 string value = a.GetString ();
1205                                                                 if (value.Length != 0)
1206                                                                         RootContext.StrongNameKeyFile = value;
1207                                                         }
1208                                                         break;
1209                                                 case "AssemblyKeyName":
1210                                                 case "AssemblyKeyNameAttribute":
1211                                                 case "System.Reflection.AssemblyKeyNameAttribute":
1212                                                         if (RootContext.StrongNameKeyContainer != null) {
1213                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1214                                                                 Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1215                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
1216                                                         }
1217                                                         else {
1218                                                                 string value = a.GetString ();
1219                                                                 if (value.Length != 0)
1220                                                                         RootContext.StrongNameKeyContainer = value;
1221                                                         }
1222                                                         break;
1223                                                 case "AssemblyDelaySign":
1224                                                 case "AssemblyDelaySignAttribute":
1225                                                 case "System.Reflection.AssemblyDelaySignAttribute":
1226                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1227                                                         break;
1228                                         }
1229                                 }
1230                         }
1231
1232                         AssemblyName an = new AssemblyName ();
1233                         an.Name = Path.GetFileNameWithoutExtension (name);
1234
1235                         // note: delay doesn't apply when using a key container
1236                         if (RootContext.StrongNameKeyContainer != null) {
1237                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1238                                 return an;
1239                         }
1240
1241                         // strongname is optional
1242                         if (RootContext.StrongNameKeyFile == null)
1243                                 return an;
1244
1245                         string AssemblyDir = Path.GetDirectoryName (output);
1246
1247                         // the StrongName key file may be relative to (a) the compiled
1248                         // file or (b) to the output assembly. See bugzilla #55320
1249                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1250
1251                         // (a) relative to the compiled file
1252                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1253                         bool exist = File.Exists (filename);
1254                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1255                                 // (b) relative to the outputed assembly
1256                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1257                                 exist = File.Exists (filename);
1258                         }
1259
1260                         if (exist) {
1261                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1262                                         byte[] snkeypair = new byte [fs.Length];
1263                                         fs.Read (snkeypair, 0, snkeypair.Length);
1264
1265                                         if (RootContext.StrongNameDelaySign) {
1266                                                 // delayed signing - DO NOT include private key
1267                                                 SetPublicKey (an, snkeypair);
1268                                         }
1269                                         else {
1270                                                 // no delay so we make sure we have the private key
1271                                                 try {
1272                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1273                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1274                                                 }
1275                                                 catch (CryptographicException) {
1276                                                         if (snkeypair.Length == 16) {
1277                                                                 // error # is different for ECMA key
1278                                                                 Report.Error (1606, "Could not sign the assembly. " +
1279                                                                         "ECMA key can only be used to delay-sign assemblies");
1280                                                         }
1281                                                         else {
1282                                                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not have a private key");
1283                                                         }
1284                                                         return null;
1285                                                 }
1286                                         }
1287                                 }
1288                         }
1289                         else {
1290                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not exist");
1291                                 return null;
1292                         }
1293                         return an;
1294                 }
1295
1296                 void Error_AssemblySigning (string text)
1297                 {
1298                         Report.Error (1548, "Error during assembly signing. " + text);
1299                 }
1300
1301 #if GMCS_SOURCE
1302                 bool CheckInternalsVisibleAttribute (Attribute a)
1303                 {
1304                         string assembly_name = a.GetString ();
1305                         if (assembly_name.Length == 0)
1306                                 return false;
1307
1308                         AssemblyName aname = null;
1309                         try {
1310                                 aname = new AssemblyName (assembly_name);
1311                         } catch (FileLoadException) {
1312                         } catch (ArgumentException) {
1313                         }
1314
1315                         // Bad assembly name format
1316                         if (aname == null)
1317                                 Report.Warning (1700, 3, a.Location, "Assembly reference `" + assembly_name + "' is invalid and cannot be resolved");
1318                         // Report error if we have defined Version or Culture
1319                         else if (aname.Version != null || aname.CultureInfo != null)
1320                                 throw new Exception ("Friend assembly `" + a.GetString () +
1321                                                 "' is invalid. InternalsVisibleTo cannot have version or culture specified.");
1322                         else if (aname.GetPublicKey () == null && Name.GetPublicKey () != null && Name.GetPublicKey ().Length != 0) {
1323                                 Report.Error (1726, a.Location, "Friend assembly reference `" + aname.FullName + "' is invalid." +
1324                                                 " Strong named assemblies must specify a public key in their InternalsVisibleTo declarations");
1325                                 return false;
1326                         }
1327
1328                         return true;
1329                 }
1330 #endif
1331
1332                 static bool IsValidAssemblyVersion (string version)
1333                 {
1334                         Version v;
1335                         try {
1336                                 v = new Version (version);
1337                         } catch {
1338                                 try {
1339                                         int major = int.Parse (version, CultureInfo.InvariantCulture);
1340                                         v = new Version (major, 0);
1341                                 } catch {
1342                                         return false;
1343                                 }
1344                         }
1345
1346                         foreach (int candidate in new int [] { v.Major, v.Minor, v.Build, v.Revision }) {
1347                                 if (candidate > ushort.MaxValue)
1348                                         return false;
1349                         }
1350
1351                         return true;
1352                 }
1353
1354                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1355                 {
1356                         if (TypeManager.IsSubclassOf (a.Type, TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1357                                 if (declarative_security == null)
1358                                         declarative_security = new ListDictionary ();
1359
1360                                 a.ExtractSecurityPermissionSet (declarative_security);
1361                                 return;
1362                         }
1363
1364                         if (a.Type == TypeManager.assembly_culture_attribute_type) {
1365                                 string value = a.GetString ();
1366                                 if (value == null || value.Length == 0)
1367                                         return;
1368
1369                                 if (RootContext.Target == Target.Exe) {
1370                                         a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
1371                                         return;
1372                                 }
1373                         }
1374
1375                         if (a.Type == TypeManager.assembly_version_attribute_type) {
1376                                 string value = a.GetString ();
1377                                 if (value == null || value.Length == 0)
1378                                         return;
1379
1380                                 value = value.Replace ('*', '0');
1381
1382                                 if (!IsValidAssemblyVersion (value)) {
1383                                         a.Error_AttributeEmitError (string.Format ("Specified version `{0}' is not valid", value));
1384                                         return;
1385                                 }
1386                         }
1387
1388 #if GMCS_SOURCE
1389                         if (a.Type == TypeManager.internals_visible_attr_type && !CheckInternalsVisibleAttribute (a))
1390                                 return;
1391
1392                         if (a.Type == TypeManager.type_forwarder_attr_type) {
1393                                 Type t = a.GetArgumentType ();
1394                                 if (t == null || TypeManager.HasElementType (t)) {
1395                                         Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
1396                                         return;
1397                                 }
1398
1399                                 if (emitted_forwarders == null) {
1400                                         emitted_forwarders = new ListDictionary();
1401                                 } else if (emitted_forwarders.Contains(t)) {
1402                                         Report.SymbolRelatedToPreviousError(((Attribute)emitted_forwarders[t]).Location, null);
1403                                         Report.Error(739, a.Location, "A duplicate type forward of type `{0}'",
1404                                                 TypeManager.CSharpName(t));
1405                                         return;
1406                                 }
1407
1408                                 emitted_forwarders.Add(t, a);
1409
1410                                 if (TypeManager.LookupDeclSpace (t) != null) {
1411                                         Report.SymbolRelatedToPreviousError (t);
1412                                         Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
1413                                                 TypeManager.CSharpName (t));
1414                                         return;
1415                                 }
1416
1417                                 if (t.IsNested) {
1418                                         Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
1419                                                 TypeManager.CSharpName (t));
1420                                         return;
1421                                 }
1422
1423                                 if (t.IsGenericType) {
1424                                         Report.Error (733, a.Location, "Cannot forward generic type `{0}'", TypeManager.CSharpName (t));
1425                                         return;
1426                                 }
1427
1428                                 if (add_type_forwarder == null) {
1429                                         add_type_forwarder = typeof (AssemblyBuilder).GetMethod ("AddTypeForwarder",
1430                                                 BindingFlags.NonPublic | BindingFlags.Instance);
1431
1432                                         if (add_type_forwarder == null) {
1433                                                 Report.RuntimeMissingSupport (a.Location, "TypeForwardedTo attribute");
1434                                                 return;
1435                                         }
1436                                 }
1437
1438                                 add_type_forwarder.Invoke (Builder, new object[] { t });
1439                                 return;
1440                         }
1441
1442                         if (a.Type == TypeManager.extension_attribute_type) {
1443                                 a.Error_MisusedExtensionAttribute ();
1444                                 return;
1445                         }
1446 #endif
1447                         Builder.SetCustomAttribute (customBuilder);
1448                 }
1449
1450                 public override void Emit (TypeContainer tc)
1451                 {
1452                         base.Emit (tc);
1453
1454 #if GMCS_SOURCE
1455                         if (has_extension_method)
1456                                 Builder.SetCustomAttribute (TypeManager.extension_attribute_attr);
1457
1458                         // FIXME: Does this belong inside SRE.AssemblyBuilder instead?
1459                         if (OptAttributes == null || !OptAttributes.Contains (TypeManager.runtime_compatibility_attr_type)) {
1460                                 ConstructorInfo ci = TypeManager.GetCoreConstructor (
1461                                         TypeManager.runtime_compatibility_attr_type, Type.EmptyTypes);
1462                                 PropertyInfo [] pis = new PropertyInfo [1];
1463                                 pis [0] = TypeManager.GetCoreProperty (
1464                                         TypeManager.runtime_compatibility_attr_type, "WrapNonExceptionThrows");
1465                                 object [] pargs = new object [1];
1466                                 pargs [0] = true;
1467                                 Builder.SetCustomAttribute (new CustomAttributeBuilder (ci, new object [0], pis, pargs));
1468                         }
1469 #endif
1470
1471                         if (declarative_security != null) {
1472
1473                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1474                                 object builder_instance = Builder;
1475
1476                                 try {
1477                                         // Microsoft runtime hacking
1478                                         if (add_permission == null) {
1479                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1480                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1481
1482                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1483                                                 builder_instance = fi.GetValue (Builder);
1484                                         }
1485
1486                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1487                                                                                                   declarative_security [SecurityAction.RequestOptional],
1488                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1489                                         add_permission.Invoke (builder_instance, args);
1490                                 }
1491                                 catch {
1492                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1493                                 }
1494                         }
1495                 }
1496
1497                 public override string[] ValidAttributeTargets {
1498                         get {
1499                                 return attribute_targets;
1500                         }
1501                 }
1502
1503                 // Wrapper for AssemblyBuilder.AddModule
1504                 static MethodInfo adder_method;
1505                 static public MethodInfo AddModule_Method {
1506                         get {
1507                                 if (adder_method == null)
1508                                         adder_method = typeof (AssemblyBuilder).GetMethod ("AddModule", BindingFlags.Instance|BindingFlags.NonPublic);
1509                                 return adder_method;
1510                         }
1511                 }
1512                 public Module AddModule (string module)
1513                 {
1514                         MethodInfo m = AddModule_Method;
1515                         if (m == null) {
1516                                 Report.RuntimeMissingSupport (Location.Null, "/addmodule");
1517                                 Environment.Exit (1);
1518                         }
1519
1520                         try {
1521                                 return (Module) m.Invoke (Builder, new object [] { module });
1522                         } catch (TargetInvocationException ex) {
1523                                 throw ex.InnerException;
1524                         }
1525                 }
1526         }
1527
1528         public class ModuleClass : CommonAssemblyModulClass {
1529                 // TODO: make it private and move all builder based methods here
1530                 public ModuleBuilder Builder;
1531                 bool m_module_is_unsafe;
1532                 bool has_default_charset;
1533
1534                 public CharSet DefaultCharSet = CharSet.Ansi;
1535                 public TypeAttributes DefaultCharSetType = TypeAttributes.AnsiClass;
1536
1537                 static string[] attribute_targets = new string [] { "module" };
1538
1539                 public ModuleClass (bool is_unsafe)
1540                 {
1541                         m_module_is_unsafe = is_unsafe;
1542                 }
1543
1544                 public override AttributeTargets AttributeTargets {
1545                         get {
1546                                 return AttributeTargets.Module;
1547                         }
1548                 }
1549
1550                 public override bool IsClsComplianceRequired ()
1551                 {
1552                         return CodeGen.Assembly.IsClsCompliant;
1553                 }
1554
1555                 public override void Emit (TypeContainer tc)
1556                 {
1557                         base.Emit (tc);
1558
1559                         if (!m_module_is_unsafe)
1560                                 return;
1561
1562                         if (TypeManager.unverifiable_code_ctor == null) {
1563                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1564                                 return;
1565                         }
1566
1567                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1568                 }
1569
1570                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1571                 {
1572                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1573                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1574                                         Report.Warning (3012, 1, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1575                                 }
1576                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1577                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.GetSignatureForError ());
1578                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1579                                         return;
1580                                 }
1581                         }
1582
1583                         Builder.SetCustomAttribute (customBuilder);
1584                 }
1585
1586                 public bool HasDefaultCharSet {
1587                         get {
1588                                 return has_default_charset;
1589                         }
1590                 }
1591
1592                 /// <summary>
1593                 /// It is called very early therefore can resolve only predefined attributes
1594                 /// </summary>
1595                 public void Resolve ()
1596                 {
1597 #if GMCS_SOURCE
1598                         if (OptAttributes == null)
1599                                 return;
1600
1601                         if (!OptAttributes.CheckTargets())
1602                                 return;
1603
1604                         Attribute a = ResolveAttribute (TypeManager.default_charset_type);
1605                         if (a != null) {
1606                                 has_default_charset = true;
1607                                 DefaultCharSet = a.GetCharSetValue ();
1608                                 switch (DefaultCharSet) {
1609                                         case CharSet.Ansi:
1610                                         case CharSet.None:
1611                                                 break;
1612                                         case CharSet.Auto:
1613                                                 DefaultCharSetType = TypeAttributes.AutoClass;
1614                                                 break;
1615                                         case CharSet.Unicode:
1616                                                 DefaultCharSetType = TypeAttributes.UnicodeClass;
1617                                                 break;
1618                                         default:
1619                                                 Report.Error (1724, a.Location, "Value specified for the argument to 'System.Runtime.InteropServices.DefaultCharSetAttribute' is not valid");
1620                                                 break;
1621                                 }
1622                         }
1623 #endif
1624                 }
1625
1626                 public override string[] ValidAttributeTargets {
1627                         get {
1628                                 return attribute_targets;
1629                         }
1630                 }
1631         }
1632 }