mcs/mcs/codegen.cs

   1 //
   2 // codegen.cs: The code generator
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //
   7 // Copyright 2001, 2002, 2003 Ximian, Inc.
   8 // Copyright 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
  42                 public static AssemblyClass Assembly;
  43
  44                 static CodeGen ()
  45                 {
  46                         Reset ();
  47                 }
  48
  49                 public static void Reset ()
  50                 {
  51                         Assembly = new AssemblyClass ();
  52                 }
  53
  54                 public static string Basename (string name)
  55                 {
  56                         int pos = name.LastIndexOf ('/');
  57
  58                         if (pos != -1)
  59                                 return name.Substring (pos + 1);
  60
  61                         pos = name.LastIndexOf ('\\');
  62                         if (pos != -1)
  63                                 return name.Substring (pos + 1);
  64
  65                         return name;
  66                 }
  67
  68                 public static string Dirname (string name)
  69                 {
  70                         int pos = name.LastIndexOf ('/');
  71
  72                         if (pos != -1)
  73                                 return name.Substring (0, pos);
  74
  75                         pos = name.LastIndexOf ('\\');
  76                         if (pos != -1)
  77                                 return name.Substring (0, pos);
  78
  79                         return ".";
  80                 }
  81
  82                 static public string FileName;
  83
  84 #if MS_COMPATIBLE
  85                 const AssemblyBuilderAccess COMPILER_ACCESS = 0;
  86 #else
  87                 /* Keep this in sync with System.Reflection.Emit.AssemblyBuilder */
  88                 const AssemblyBuilderAccess COMPILER_ACCESS = (AssemblyBuilderAccess) 0x800;
  89 #endif
  90
  91                 //
  92                 // Initializes the code generator variables for interactive use (repl)
  93                 //
  94                 static public void InitDynamic (string name)
  95                 {
  96                         current_domain = AppDomain.CurrentDomain;
  97                         AssemblyName an = Assembly.GetAssemblyName (name, name);
  98
  99                         Assembly.Builder = current_domain.DefineDynamicAssembly (an, AssemblyBuilderAccess.Run | COMPILER_ACCESS);
 100                         RootContext.ToplevelTypes = new ModuleContainer (true);
 101                         RootContext.ToplevelTypes.Builder = Assembly.Builder.DefineDynamicModule (Basename (name), false);
 102                         Assembly.Name = Assembly.Builder.GetName ();
 103                 }
 104
 105                 //
 106                 // Initializes the code generator variables
 107                 //
 108                 static public bool Init (string name, string output, bool want_debugging_support)
 109                 {
 110                         FileName = output;
 111                         AssemblyName an = Assembly.GetAssemblyName (name, output);
 112                         if (an == null)
 113                                 return false;
 114
 115                         if (an.KeyPair != null) {
 116                                 // If we are going to strong name our assembly make
 117                                 // sure all its refs are strong named
 118                                 foreach (Assembly a in GlobalRootNamespace.Instance.Assemblies) {
 119                                         AssemblyName ref_name = a.GetName ();
 120                                         byte [] b = ref_name.GetPublicKeyToken ();
 121                                         if (b == null || b.Length == 0) {
 122                                                 Report.Error (1577, "Assembly generation failed " +
 123                                                                 "-- Referenced assembly '" +
 124                                                                 ref_name.Name +
 125                                                                 "' does not have a strong name.");
 126                                                 //Environment.Exit (1);
 127                                         }
 128                                 }
 129                         }
 130
 131                         current_domain = AppDomain.CurrentDomain;
 132
 133                         try {
 134                                 Assembly.Builder = current_domain.DefineDynamicAssembly (an,
 135                                         AssemblyBuilderAccess.RunAndSave | COMPILER_ACCESS, Dirname (name));
 136                         }
 137                         catch (ArgumentException) {
 138                                 // specified key may not be exportable outside it's container
 139                                 if (RootContext.StrongNameKeyContainer != null) {
 140                                         Report.Error (1548, "Could not access the key inside the container `" +
 141                                                 RootContext.StrongNameKeyContainer + "'.");
 142                                         Environment.Exit (1);
 143                                 }
 144                                 throw;
 145                         }
 146                         catch (CryptographicException) {
 147                                 if ((RootContext.StrongNameKeyContainer != null) || (RootContext.StrongNameKeyFile != null)) {
 148                                         Report.Error (1548, "Could not use the specified key to strongname the assembly.");
 149                                         Environment.Exit (1);
 150                                 }
 151                                 return false;
 152                         }
 153
 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
 158                         //
 159                         // Pass a path-less name to DefineDynamicModule.  Wonder how
 160                         // this copes with output in different directories then.
 161                         // FIXME: figure out how this copes with --output /tmp/blah
 162                         //
 163                         // If the third argument is true, the ModuleBuilder will dynamically
 164                         // load the default symbol writer.
 165                         //
 166                         try {
 167                                 RootContext.ToplevelTypes.Builder = Assembly.Builder.DefineDynamicModule (
 168                                         Basename (name), Basename (output), want_debugging_support);
 169
 170 #if !MS_COMPATIBLE
 171                                 // TODO: We should use SymbolWriter from DefineDynamicModule
 172                                 if (want_debugging_support && !SymbolWriter.Initialize (RootContext.ToplevelTypes.Builder, output)) {
 173                                         Report.Error (40, "Unexpected debug information initialization error `{0}'",
 174                                                 "Could not find the symbol writer assembly (Mono.CompilerServices.SymbolWriter.dll)");
 175                                         return false;
 176                                 }
 177 #endif
 178                         } catch (ExecutionEngineException e) {
 179                                 Report.Error (40, "Unexpected debug information initialization error `{0}'",
 180                                         e.Message);
 181                                 return false;
 182                         }
 183
 184                         return true;
 185                 }
 186
 187                 static public void Save (string name, bool saveDebugInfo)
 188                 {
 189                         try {
 190                                 Assembly.Builder.Save (Basename (name));
 191                         }
 192                         catch (COMException) {
 193                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 194                                         throw;
 195
 196                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 197                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 198                                         RootContext.StrongNameKeyFile +
 199                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 200                         }
 201                         catch (System.IO.IOException io) {
 202                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 203                                 return;
 204                         }
 205                         catch (System.UnauthorizedAccessException ua) {
 206                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + ua.Message);
 207                                 return;
 208                         }
 209
 210                         //
 211                         // Write debuger symbol file
 212                         //
 213                         if (saveDebugInfo)
 214                                 SymbolWriter.WriteSymbolFile ();
 215                         }
 216         }
 217
 218
 219         /// <summary>
 220         /// An interface to hold all the information needed in the resolving phase.
 221         /// </summary>
 222         public interface IResolveContext
 223         {
 224                 DeclSpace DeclContainer { get; }
 225                 bool IsInObsoleteScope { get; }
 226                 bool IsInUnsafeScope { get; }
 227
 228                 // the declcontainer to lookup for type-parameters.  Should only use LookupGeneric on it.
 229                 //
 230                 // FIXME: This is somewhat of a hack.  We don't need a full DeclSpace for this.  We just need the
 231                 //        current type parameters in scope. IUIC, that will require us to rewrite GenericMethod.
 232                 //        Maybe we can replace this with a 'LookupGeneric (string)' instead, but we'll have to
 233                 //        handle generic method overrides differently
 234                 DeclSpace GenericDeclContainer { get; }
 235         }
 236
 237         /// <summary>
 238         ///   An Emit Context is created for each body of code (from methods,
 239         ///   properties bodies, indexer bodies or constructor bodies)
 240         /// </summary>
 241         public class EmitContext : IResolveContext {
 242
 243                 //
 244                 // Holds a varible used during collection or object initialization.
 245                 //
 246                 public Expression CurrentInitializerVariable;
 247
 248                 DeclSpace decl_space;
 249
 250                 public DeclSpace TypeContainer;
 251                 public ILGenerator ig;
 252
 253                 [Flags]
 254                 public enum Flags : int {
 255                         /// <summary>
 256                         ///   This flag tracks the `checked' state of the compilation,
 257                         ///   it controls whether we should generate code that does overflow
 258                         ///   checking, or if we generate code that ignores overflows.
 259                         ///
 260                         ///   The default setting comes from the command line option to generate
 261                         ///   checked or unchecked code plus any source code changes using the
 262                         ///   checked/unchecked statements or expressions.   Contrast this with
 263                         ///   the ConstantCheckState flag.
 264                         /// </summary>
 265                         CheckState = 1 << 0,
 266
 267                         /// <summary>
 268                         ///   The constant check state is always set to `true' and cant be changed
 269                         ///   from the command line.  The source code can change this setting with
 270                         ///   the `checked' and `unchecked' statements and expressions.
 271                         /// </summary>
 272                         ConstantCheckState = 1 << 1,
 273
 274                         AllCheckStateFlags = CheckState | ConstantCheckState,
 275
 276                         /// <summary>
 277                         ///  Whether we are inside an unsafe block
 278                         /// </summary>
 279                         InUnsafe = 1 << 2,
 280
 281                         InCatch = 1 << 3,
 282                         InFinally = 1 << 4,
 283
 284                         /// <summary>
 285                         ///   Whether control flow analysis is enabled
 286                         /// </summary>
 287                         DoFlowAnalysis = 1 << 5,
 288
 289                         /// <summary>
 290                         ///   Whether control flow analysis is disabled on structs
 291                         ///   (only meaningful when DoFlowAnalysis is set)
 292                         /// </summary>
 293                         OmitStructFlowAnalysis = 1 << 6,
 294
 295                         ///
 296                         /// Indicates the current context is in probing mode, no errors are reported.
 297                         ///
 298                         ProbingMode = 1 <<      7,
 299
 300                         //
 301                         // Inside field intializer expression
 302                         //
 303                         InFieldInitializer = 1 << 8,
 304
 305                         InferReturnType = 1 << 9,
 306
 307                         InCompoundAssignment = 1 << 10,
 308
 309                         OmitDebuggingInfo = 1 << 11
 310                 }
 311
 312                 Flags flags;
 313
 314                 /// <summary>
 315                 ///   Whether we are emitting code inside a static or instance method
 316                 /// </summary>
 317                 public bool IsStatic;
 318
 319                 /// <summary>
 320                 ///   Whether the actual created method is static or instance method.
 321                 ///   Althoug the method might be declared as `static', if an anonymous
 322                 ///   method is involved, we might turn this into an instance method.
 323                 ///
 324                 ///   So this reflects the low-level staticness of the method, while
 325                 ///   IsStatic represents the semantic, high-level staticness.
 326                 /// </summary>
 327                 //public bool MethodIsStatic;
 328
 329                 /// <summary>
 330                 ///   The value that is allowed to be returned or NULL if there is no
 331                 ///   return type.
 332                 /// </summary>
 333                 Type return_type;
 334
 335                 /// <summary>
 336                 ///   Points to the Type (extracted from the TypeContainer) that
 337                 ///   declares this body of code
 338                 /// </summary>
 339                 public readonly Type ContainerType;
 340
 341                 /// <summary>
 342                 ///   Whether this is generating code for a constructor
 343                 /// </summary>
 344                 public bool IsConstructor;
 345
 346                 /// <summary>
 347                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 348                 ///   to store structures (used to compute the address of the structure
 349                 ///   value on structure method invocations)
 350                 /// </summary>
 351                 public Hashtable temporary_storage;
 352
 353                 public Block CurrentBlock;
 354
 355                 public int CurrentFile;
 356
 357                 /// <summary>
 358                 ///   The location where we store the return value.
 359                 /// </summary>
 360                 LocalBuilder return_value;
 361
 362                 /// <summary>
 363                 ///   The location where return has to jump to return the
 364                 ///   value
 365                 /// </summary>
 366                 public Label ReturnLabel;
 367
 368                 /// <summary>
 369                 ///   If we already defined the ReturnLabel
 370                 /// </summary>
 371                 public bool HasReturnLabel;
 372
 373                 /// <summary>
 374                 ///  Whether we are in a `fixed' initialization
 375                 /// </summary>
 376                 public bool InFixedInitializer;
 377
 378                 /// <summary>
 379                 ///  Whether we are inside an anonymous method.
 380                 /// </summary>
 381                 public AnonymousExpression CurrentAnonymousMethod;
 382
 383                 /// <summary>
 384                 ///   Location for this EmitContext
 385                 /// </summary>
 386                 public Location loc;
 387
 388                 /// <summary>
 389                 ///   Inside an enum definition, we do not resolve enumeration values
 390                 ///   to their enumerations, but rather to the underlying type/value
 391                 ///   This is so EnumVal + EnumValB can be evaluated.
 392                 ///
 393                 ///   There is no "E operator + (E x, E y)", so during an enum evaluation
 394                 ///   we relax the rules
 395                 /// </summary>
 396                 public bool InEnumContext;
 397
 398                 public readonly IResolveContext ResolveContext;
 399
 400                 /// <summary>
 401                 ///    The current iterator
 402                 /// </summary>
 403                 public Iterator CurrentIterator {
 404                         get { return CurrentAnonymousMethod as Iterator; }
 405                 }
 406
 407                 /// <summary>
 408                 ///    Whether we are in the resolving stage or not
 409                 /// </summary>
 410                 enum Phase {
 411                         Created,
 412                         Resolving,
 413                         Emitting
 414                 }
 415
 416                 bool isAnonymousMethodAllowed = true;
 417
 418                 Phase current_phase;
 419                 FlowBranching current_flow_branching;
 420
 421                 static int next_id = 0;
 422                 int id = ++next_id;
 423
 424                 public override string ToString ()
 425                 {
 426                         return String.Format ("EmitContext ({0}:{1})", id,
 427                                               CurrentAnonymousMethod, loc);
 428                 }
 429
 430                 public EmitContext (IResolveContext rc, DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 431                                     Type return_type, int code_flags, bool is_constructor)
 432                 {
 433                         this.ResolveContext = rc;
 434                         this.ig = ig;
 435
 436                         TypeContainer = parent;
 437                         this.decl_space = ds;
 438                         if (RootContext.Checked)
 439                                 flags |= Flags.CheckState;
 440                         flags |= Flags.ConstantCheckState;
 441
 442                         if (return_type == null)
 443                                 throw new ArgumentNullException ("return_type");
 444
 445                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 446                         ReturnType = return_type;
 447                         IsConstructor = is_constructor;
 448                         CurrentBlock = null;
 449                         CurrentFile = 0;
 450                         current_phase = Phase.Created;
 451
 452                         if (parent != null){
 453                                 // Can only be null for the ResolveType contexts.
 454                                 ContainerType = parent.TypeBuilder;
 455                                 if (rc.IsInUnsafeScope)
 456                                         flags |= Flags.InUnsafe;
 457                         }
 458                         loc = l;
 459                 }
 460
 461                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 462                                     Type return_type, int code_flags, bool is_constructor)
 463                         : this (rc, ds, ds, l, ig, return_type, code_flags, is_constructor)
 464                 {
 465                 }
 466
 467                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 468                                     Type return_type, int code_flags)
 469                         : this (rc, ds, ds, l, ig, return_type, code_flags, false)
 470                 {
 471                 }
 472
 473                 // IResolveContext.DeclContainer
 474                 public DeclSpace DeclContainer {
 475                         get { return decl_space; }
 476                         set { decl_space = value; }
 477                 }
 478
 479                 // IResolveContext.GenericDeclContainer
 480                 public DeclSpace GenericDeclContainer {
 481                         get { return DeclContainer; }
 482                 }
 483
 484                 public bool CheckState {
 485                         get { return (flags & Flags.CheckState) != 0; }
 486                 }
 487
 488                 public bool ConstantCheckState {
 489                         get { return (flags & Flags.ConstantCheckState) != 0; }
 490                 }
 491
 492                 public bool InUnsafe {
 493                         get { return (flags & Flags.InUnsafe) != 0; }
 494                 }
 495
 496                 public bool InCatch {
 497                         get { return (flags & Flags.InCatch) != 0; }
 498                 }
 499
 500                 public bool InFinally {
 501                         get { return (flags & Flags.InFinally) != 0; }
 502                 }
 503
 504                 public bool DoFlowAnalysis {
 505                         get { return (flags & Flags.DoFlowAnalysis) != 0; }
 506                 }
 507
 508                 public bool OmitStructFlowAnalysis {
 509                         get { return (flags & Flags.OmitStructFlowAnalysis) != 0; }
 510                 }
 511
 512                 // utility helper for CheckExpr, UnCheckExpr, Checked and Unchecked statements
 513                 // it's public so that we can use a struct at the callsite
 514                 public struct FlagsHandle : IDisposable
 515                 {
 516                         EmitContext ec;
 517                         readonly Flags invmask, oldval;
 518
 519                         public FlagsHandle (EmitContext ec, Flags flagsToSet)
 520                                 : this (ec, flagsToSet, flagsToSet)
 521                         {
 522                         }
 523
 524                         internal FlagsHandle (EmitContext ec, Flags mask, Flags val)
 525                         {
 526                                 this.ec = ec;
 527                                 invmask = ~mask;
 528                                 oldval = ec.flags & mask;
 529                                 ec.flags = (ec.flags & invmask) | (val & mask);
 530
 531                                 if ((mask & Flags.ProbingMode) != 0)
 532                                         Report.DisableReporting ();
 533                         }
 534
 535                         public void Dispose ()
 536                         {
 537                                 if ((invmask & Flags.ProbingMode) == 0)
 538                                         Report.EnableReporting ();
 539
 540                                 ec.flags = (ec.flags & invmask) | oldval;
 541                         }
 542                 }
 543
 544                 // Temporarily set all the given flags to the given value.  Should be used in an 'using' statement
 545                 public FlagsHandle Set (Flags flagsToSet)
 546                 {
 547                         return new FlagsHandle (this, flagsToSet);
 548                 }
 549
 550                 public FlagsHandle With (Flags bits, bool enable)
 551                 {
 552                         return new FlagsHandle (this, bits, enable ? bits : 0);
 553                 }
 554
 555                 public FlagsHandle WithFlowAnalysis (bool do_flow_analysis, bool omit_struct_analysis)
 556                 {
 557                         Flags newflags =
 558                                 (do_flow_analysis ? Flags.DoFlowAnalysis : 0) |
 559                                 (omit_struct_analysis ? Flags.OmitStructFlowAnalysis : 0);
 560                         return new FlagsHandle (this, Flags.DoFlowAnalysis | Flags.OmitStructFlowAnalysis, newflags);
 561                 }
 562
 563                 /// <summary>
 564                 ///   If this is true, then Return and ContextualReturn statements
 565                 ///   will set the ReturnType value based on the expression types
 566                 ///   of each return statement instead of the method return type
 567                 ///   (which is initially null).
 568                 /// </summary>
 569                 public bool InferReturnType {
 570                         get { return (flags & Flags.InferReturnType) != 0; }
 571                 }
 572
 573                 // IResolveContext.IsInObsoleteScope
 574                 public bool IsInObsoleteScope {
 575                         get {
 576                                 // Disables obsolete checks when probing is on
 577                                 return IsInProbingMode || ResolveContext.IsInObsoleteScope;
 578                         }
 579                 }
 580
 581                 public bool IsInProbingMode {
 582                         get { return (flags & Flags.ProbingMode) != 0; }
 583                 }
 584
 585                 // IResolveContext.IsInUnsafeScope
 586                 public bool IsInUnsafeScope {
 587                         get { return InUnsafe || ResolveContext.IsInUnsafeScope; }
 588                 }
 589
 590                 public bool IsAnonymousMethodAllowed {
 591                         get { return isAnonymousMethodAllowed; }
 592                         set { isAnonymousMethodAllowed = value; }
 593                 }
 594
 595                 public bool IsInFieldInitializer {
 596                         get { return (flags & Flags.InFieldInitializer) != 0; }
 597                 }
 598
 599                 public bool IsInCompoundAssignment {
 600                         get { return (flags & Flags.InCompoundAssignment) != 0; }
 601                 }
 602
 603                 public bool IsVariableCapturingRequired {
 604                         get {
 605                                 return !IsInProbingMode && (CurrentBranching == null || !CurrentBranching.CurrentUsageVector.IsUnreachable);
 606                         }
 607                 }
 608
 609                 public FlowBranching CurrentBranching {
 610                         get { return current_flow_branching; }
 611                 }
 612
 613                 public bool OmitDebuggingInfo {
 614                         get { return (flags & Flags.OmitDebuggingInfo) != 0; }
 615                         set {
 616                                 if (value)
 617                                         flags |= Flags.OmitDebuggingInfo;
 618                                 else
 619                                         flags &= ~Flags.OmitDebuggingInfo;
 620                         }
 621                 }
 622
 623                 // <summary>
 624                 //   Starts a new code branching.  This inherits the state of all local
 625                 //   variables and parameters from the current branching.
 626                 // </summary>
 627                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 628                 {
 629                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 630                         return current_flow_branching;
 631                 }
 632
 633                 // <summary>
 634                 //   Starts a new code branching for block `block'.
 635                 // </summary>
 636                 public FlowBranching StartFlowBranching (Block block)
 637                 {
 638                         flags |= Flags.DoFlowAnalysis;
 639
 640                         current_flow_branching = FlowBranching.CreateBranching (
 641                                 CurrentBranching, FlowBranching.BranchingType.Block, block, block.StartLocation);
 642                         return current_flow_branching;
 643                 }
 644
 645                 public FlowBranchingTryCatch StartFlowBranching (TryCatch stmt)
 646                 {
 647                         FlowBranchingTryCatch branching = new FlowBranchingTryCatch (CurrentBranching, stmt);
 648                         current_flow_branching = branching;
 649                         return branching;
 650                 }
 651
 652                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 653                 {
 654                         FlowBranchingException branching = new FlowBranchingException (CurrentBranching, stmt);
 655                         current_flow_branching = branching;
 656                         return branching;
 657                 }
 658
 659                 public FlowBranchingLabeled StartFlowBranching (LabeledStatement stmt)
 660                 {
 661                         FlowBranchingLabeled branching = new FlowBranchingLabeled (CurrentBranching, stmt);
 662                         current_flow_branching = branching;
 663                         return branching;
 664                 }
 665
 666                 public FlowBranchingIterator StartFlowBranching (Iterator iterator)
 667                 {
 668                         FlowBranchingIterator branching = new FlowBranchingIterator (CurrentBranching, iterator);
 669                         current_flow_branching = branching;
 670                         return branching;
 671                 }
 672
 673                 public FlowBranchingToplevel StartFlowBranching (ToplevelBlock stmt)
 674                 {
 675                         FlowBranchingToplevel branching = new FlowBranchingToplevel (CurrentBranching, stmt);
 676                         current_flow_branching = branching;
 677                         return branching;
 678                 }
 679
 680                 // <summary>
 681                 //   Ends a code branching.  Merges the state of locals and parameters
 682                 //   from all the children of the ending branching.
 683                 // </summary>
 684                 public bool EndFlowBranching ()
 685                 {
 686                         FlowBranching old = current_flow_branching;
 687                         current_flow_branching = current_flow_branching.Parent;
 688
 689                         FlowBranching.UsageVector vector = current_flow_branching.MergeChild (old);
 690                         return vector.IsUnreachable;
 691                 }
 692
 693                 // <summary>
 694                 //   Kills the current code branching.  This throws away any changed state
 695                 //   information and should only be used in case of an error.
 696                 // </summary>
 697                 // FIXME: this is evil
 698                 public void KillFlowBranching ()
 699                 {
 700                         current_flow_branching = current_flow_branching.Parent;
 701                 }
 702
 703                 public bool MustCaptureVariable (LocalInfo local)
 704                 {
 705                         if (CurrentAnonymousMethod == null)
 706                                 return false;
 707
 708                         // FIXME: IsIterator is too aggressive, we should capture only if child
 709                         // block contains yield
 710                         if (CurrentAnonymousMethod.IsIterator)
 711                                 return true;
 712
 713                         return local.Block.Toplevel != CurrentBlock.Toplevel;
 714                 }
 715
 716                 public void EmitMeta (ToplevelBlock b)
 717                 {
 718                         b.EmitMeta (this);
 719
 720                         if (HasReturnLabel)
 721                                 ReturnLabel = ig.DefineLabel ();
 722                 }
 723
 724                 //
 725                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 726                 // currently can not cope with ig == null during resolve (which must
 727                 // be fixed for switch statements to work on anonymous methods).
 728                 //
 729                 public void EmitTopBlock (IMethodData md, ToplevelBlock block)
 730                 {
 731                         if (block == null)
 732                                 return;
 733
 734                         bool unreachable;
 735
 736                         if (ResolveTopBlock (null, block, md.ParameterInfo, md, out unreachable)){
 737                                 if (Report.Errors > 0)
 738                                         return;
 739
 740                                 EmitMeta (block);
 741
 742                                 current_phase = Phase.Emitting;
 743 #if PRODUCTION
 744                                 try {
 745 #endif
 746                                 EmitResolvedTopBlock (block, unreachable);
 747 #if PRODUCTION
 748                                 } catch (Exception e){
 749                                         Console.WriteLine ("Exception caught by the compiler while emitting:");
 750                                         Console.WriteLine ("   Block that caused the problem begin at: " + block.loc);
 751
 752                                         Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 753                                         throw;
 754                                 }
 755 #endif
 756                         }
 757                 }
 758
 759                 bool resolved;
 760                 bool unreachable;
 761
 762                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 763                                              ParametersCompiled ip, IMethodData md, out bool unreachable)
 764                 {
 765                         if (resolved) {
 766                                 unreachable = this.unreachable;
 767                                 return true;
 768                         }
 769
 770                         current_phase = Phase.Resolving;
 771                         unreachable = false;
 772
 773                         if (!loc.IsNull)
 774                                 CurrentFile = loc.File;
 775
 776 #if PRODUCTION
 777                         try {
 778 #endif
 779                                 if (!block.ResolveMeta (this, ip))
 780                                         return false;
 781
 782                                 using (this.With (EmitContext.Flags.DoFlowAnalysis, true)) {
 783                                         FlowBranchingToplevel top_level;
 784                                         if (anonymous_method_host != null)
 785                                                 top_level = new FlowBranchingToplevel (anonymous_method_host.CurrentBranching, block);
 786                                         else
 787                                                 top_level = block.TopLevelBranching;
 788
 789                                         current_flow_branching = top_level;
 790                                         bool ok = block.Resolve (this);
 791                                         current_flow_branching = null;
 792
 793                                         if (!ok)
 794                                                 return false;
 795
 796                                         bool flow_unreachable = top_level.End ();
 797                                         if (flow_unreachable)
 798                                                 this.unreachable = unreachable = true;
 799                                 }
 800 #if PRODUCTION
 801                         } catch (Exception e) {
 802                                 Console.WriteLine ("Exception caught by the compiler while compiling:");
 803                                 Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 804
 805                                 if (CurrentBlock != null){
 806                                         Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 807                                                            CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 808                                 }
 809                                 Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 810                                 throw;
 811                         }
 812 #endif
 813
 814                         if (return_type != TypeManager.void_type && !unreachable) {
 815                                 if (CurrentAnonymousMethod == null) {
 816                                         Report.Error (161, md.Location, "`{0}': not all code paths return a value", md.GetSignatureForError ());
 817                                         return false;
 818                                 } else if (!CurrentAnonymousMethod.IsIterator) {
 819                                         Report.Error (1643, CurrentAnonymousMethod.Location, "Not all code paths return a value in anonymous method of type `{0}'",
 820                                                       CurrentAnonymousMethod.GetSignatureForError ());
 821                                         return false;
 822                                 }
 823                         }
 824
 825                         resolved = true;
 826                         return true;
 827                 }
 828
 829                 public Type ReturnType {
 830                         set {
 831                                 return_type = value;
 832                         }
 833                         get {
 834                                 return return_type;
 835                         }
 836                 }
 837
 838                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 839                 {
 840                         if (block != null)
 841                                 block.Emit (this);
 842
 843                         if (HasReturnLabel)
 844                                 ig.MarkLabel (ReturnLabel);
 845
 846                         if (return_value != null){
 847                                 ig.Emit (OpCodes.Ldloc, return_value);
 848                                 ig.Emit (OpCodes.Ret);
 849                         } else {
 850                                 //
 851                                 // If `HasReturnLabel' is set, then we already emitted a
 852                                 // jump to the end of the method, so we must emit a `ret'
 853                                 // there.
 854                                 //
 855                                 // Unfortunately, System.Reflection.Emit automatically emits
 856                                 // a leave to the end of a finally block.  This is a problem
 857                                 // if no code is following the try/finally block since we may
 858                                 // jump to a point after the end of the method.
 859                                 // As a workaround, we're always creating a return label in
 860                                 // this case.
 861                                 //
 862
 863                                 if (HasReturnLabel || !unreachable) {
 864                                         if (return_type != TypeManager.void_type)
 865                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 866                                         ig.Emit (OpCodes.Ret);
 867                                 }
 868                         }
 869                 }
 870
 871                 /// <summary>
 872                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 873                 ///   writer to which source line this opcode belongs.
 874                 /// </summary>
 875                 public void Mark (Location loc)
 876                 {
 877                         if (!SymbolWriter.HasSymbolWriter || OmitDebuggingInfo || loc.IsNull)
 878                                 return;
 879
 880                         SymbolWriter.MarkSequencePoint (ig, loc);
 881                 }
 882
 883                 public void DefineLocalVariable (string name, LocalBuilder builder)
 884                 {
 885                         SymbolWriter.DefineLocalVariable (name, builder);
 886                 }
 887
 888                 public void BeginScope ()
 889                 {
 890                         ig.BeginScope();
 891                         SymbolWriter.OpenScope(ig);
 892                 }
 893
 894                 public void EndScope ()
 895                 {
 896                         ig.EndScope();
 897                         SymbolWriter.CloseScope(ig);
 898                 }
 899
 900                 /// <summary>
 901                 ///   Returns a temporary storage for a variable of type t as
 902                 ///   a local variable in the current body.
 903                 /// </summary>
 904                 public LocalBuilder GetTemporaryLocal (Type t)
 905                 {
 906                         if (temporary_storage != null) {
 907                                 object o = temporary_storage [t];
 908                                 if (o != null) {
 909                                         if (o is Stack) {
 910                                                 Stack s = (Stack) o;
 911                                                 o = s.Count == 0 ? null : s.Pop ();
 912                                         } else {
 913                                                 temporary_storage.Remove (t);
 914                                         }
 915                                 }
 916                                 if (o != null)
 917                                         return (LocalBuilder) o;
 918                         }
 919                         return ig.DeclareLocal (t);
 920                 }
 921
 922                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 923                 {
 924                         if (temporary_storage == null) {
 925                                 temporary_storage = new Hashtable ();
 926                                 temporary_storage [t] = b;
 927                                 return;
 928                         }
 929                         object o = temporary_storage [t];
 930                         if (o == null) {
 931                                 temporary_storage [t] = b;
 932                                 return;
 933                         }
 934                         Stack s = o as Stack;
 935                         if (s == null) {
 936                                 s = new Stack ();
 937                                 s.Push (o);
 938                                 temporary_storage [t] = s;
 939                         }
 940                         s.Push (b);
 941                 }
 942
 943                 /// <summary>
 944                 ///   Current loop begin and end labels.
 945                 /// </summary>
 946                 public Label LoopBegin, LoopEnd;
 947
 948                 /// <summary>
 949                 ///   Default target in a switch statement.   Only valid if
 950                 ///   InSwitch is true
 951                 /// </summary>
 952                 public Label DefaultTarget;
 953
 954                 /// <summary>
 955                 ///   If this is non-null, points to the current switch statement
 956                 /// </summary>
 957                 public Switch Switch;
 958
 959                 /// <summary>
 960                 ///   ReturnValue creates on demand the LocalBuilder for the
 961                 ///   return value from the function.  By default this is not
 962                 ///   used.  This is only required when returns are found inside
 963                 ///   Try or Catch statements.
 964                 ///
 965                 ///   This method is typically invoked from the Emit phase, so
 966                 ///   we allow the creation of a return label if it was not
 967                 ///   requested during the resolution phase.   Could be cleaned
 968                 ///   up, but it would replicate a lot of logic in the Emit phase
 969                 ///   of the code that uses it.
 970                 /// </summary>
 971                 public LocalBuilder TemporaryReturn ()
 972                 {
 973                         if (return_value == null){
 974                                 return_value = ig.DeclareLocal (return_type);
 975                                 if (!HasReturnLabel){
 976                                         ReturnLabel = ig.DefineLabel ();
 977                                         HasReturnLabel = true;
 978                                 }
 979                         }
 980
 981                         return return_value;
 982                 }
 983
 984                 /// <summary>
 985                 ///   This method is used during the Resolution phase to flag the
 986                 ///   need to define the ReturnLabel
 987                 /// </summary>
 988                 public void NeedReturnLabel ()
 989                 {
 990                         if (current_phase != Phase.Resolving){
 991                                 //
 992                                 // The reason is that the `ReturnLabel' is declared between
 993                                 // resolution and emission
 994                                 //
 995                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 996                         }
 997
 998                         if (!HasReturnLabel)
 999                                 HasReturnLabel = true;
1000                 }
1001
1002
1003                 public Expression GetThis (Location loc)
1004                 {
1005                         This my_this;
1006                         if (CurrentBlock != null)
1007                                 my_this = new This (CurrentBlock, loc);
1008                         else
1009                                 my_this = new This (loc);
1010
1011                         if (!my_this.ResolveBase (this))
1012                                 my_this = null;
1013
1014                         return my_this;
1015                 }
1016         }
1017
1018
1019         public abstract class CommonAssemblyModulClass : Attributable, IResolveContext {
1020
1021                 protected CommonAssemblyModulClass ():
1022                         base (null)
1023                 {
1024                 }
1025
1026                 public void AddAttributes (ArrayList attrs)
1027                 {
1028                         foreach (Attribute a in attrs)
1029                                 a.AttachTo (this);
1030
1031                         if (attributes == null) {
1032                                 attributes = new Attributes (attrs);
1033                                 return;
1034                         }
1035                         attributes.AddAttributes (attrs);
1036                 }
1037
1038                 public virtual void Emit (TypeContainer tc)
1039                 {
1040                         if (OptAttributes == null)
1041                                 return;
1042
1043                         OptAttributes.Emit ();
1044                 }
1045
1046                 protected Attribute ResolveAttribute (PredefinedAttribute a_type)
1047                 {
1048                         Attribute a = OptAttributes.Search (a_type);
1049                         if (a != null) {
1050                                 a.Resolve ();
1051                         }
1052                         return a;
1053                 }
1054
1055                 public override IResolveContext ResolveContext {
1056                         get { return this; }
1057                 }
1058
1059                 #region IResolveContext Members
1060
1061                 public DeclSpace DeclContainer {
1062                         get { return RootContext.ToplevelTypes; }
1063                 }
1064
1065                 public DeclSpace GenericDeclContainer {
1066                         get { return DeclContainer; }
1067                 }
1068
1069                 public bool IsInObsoleteScope {
1070                         get { return false; }
1071                 }
1072
1073                 public bool IsInUnsafeScope {
1074                         get { return false; }
1075                 }
1076
1077                 #endregion
1078         }
1079
1080         public class AssemblyClass : CommonAssemblyModulClass {
1081                 // TODO: make it private and move all builder based methods here
1082                 public AssemblyBuilder Builder;
1083                 bool is_cls_compliant;
1084                 bool wrap_non_exception_throws;
1085
1086                 public Attribute ClsCompliantAttribute;
1087
1088                 ListDictionary declarative_security;
1089                 bool has_extension_method;
1090                 public AssemblyName Name;
1091                 MethodInfo add_type_forwarder;
1092                 ListDictionary emitted_forwarders;
1093
1094                 // Module is here just because of error messages
1095                 static string[] attribute_targets = new string [] { "assembly", "module" };
1096
1097                 public AssemblyClass (): base ()
1098                 {
1099                         wrap_non_exception_throws = true;
1100                 }
1101
1102                 public bool HasExtensionMethods {
1103                         set {
1104                                 has_extension_method = value;
1105                         }
1106                 }
1107
1108                 public bool IsClsCompliant {
1109                         get {
1110                                 return is_cls_compliant;
1111                         }
1112                 }
1113
1114                 public bool WrapNonExceptionThrows {
1115                         get {
1116                                 return wrap_non_exception_throws;
1117                         }
1118                 }
1119
1120                 public override AttributeTargets AttributeTargets {
1121                         get {
1122                                 return AttributeTargets.Assembly;
1123                         }
1124                 }
1125
1126                 public override bool IsClsComplianceRequired ()
1127                 {
1128                         return is_cls_compliant;
1129                 }
1130
1131                 public void Resolve ()
1132                 {
1133                         if (RootContext.Unsafe) {
1134                                 //
1135                                 // Emits [assembly: SecurityPermissionAttribute (SecurityAction.RequestMinimum, SkipVerification = true)]
1136                                 // when -unsafe option was specified
1137                                 //
1138
1139                                 Location loc = Location.Null;
1140
1141                                 MemberAccess system_security_permissions = new MemberAccess (new MemberAccess (
1142                                         new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Security", loc), "Permissions", loc);
1143
1144                                 ArrayList pos = new ArrayList (1);
1145                                 pos.Add (new Argument (new MemberAccess (new MemberAccess (system_security_permissions, "SecurityAction", loc), "RequestMinimum")));
1146
1147                                 ArrayList named = new ArrayList (1);
1148                                 named.Add (new DictionaryEntry ("SkipVerification", new Argument (new BoolLiteral (true, loc))));
1149
1150                                 GlobalAttribute g = new GlobalAttribute (new NamespaceEntry (null, null, null), "assembly", system_security_permissions,
1151                                         "SecurityPermissionAttribute", new object[] { pos, named }, loc, false);
1152                                 g.AttachTo (this);
1153
1154                                 if (g.Resolve () != null) {
1155                                         declarative_security = new ListDictionary ();
1156                                         g.ExtractSecurityPermissionSet (declarative_security);
1157                                 }
1158                         }
1159
1160                         if (OptAttributes == null)
1161                                 return;
1162
1163                         // Ensure that we only have GlobalAttributes, since the Search isn't safe with other types.
1164                         if (!OptAttributes.CheckTargets())
1165                                 return;
1166
1167                         ClsCompliantAttribute = ResolveAttribute (PredefinedAttributes.Get.CLSCompliant);
1168
1169                         if (ClsCompliantAttribute != null) {
1170                                 is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue ();
1171                         }
1172
1173                         Attribute a = ResolveAttribute (PredefinedAttributes.Get.RuntimeCompatibility);
1174                         if (a != null) {
1175                                 object val = a.GetPropertyValue ("WrapNonExceptionThrows");
1176                                 if (val != null)
1177                                         wrap_non_exception_throws = (bool) val;
1178                         }
1179                 }
1180
1181                 // fix bug #56621
1182                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1183                 {
1184                         try {
1185                                 // check for possible ECMA key
1186                                 if (strongNameBlob.Length == 16) {
1187                                         // will be rejected if not "the" ECMA key
1188                                         an.SetPublicKey (strongNameBlob);
1189                                 }
1190                                 else {
1191                                         // take it, with or without, a private key
1192                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1193                                         // and make sure we only feed the public part to Sys.Ref
1194                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1195
1196                                         // AssemblyName.SetPublicKey requires an additional header
1197                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1198
1199                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1200                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1201                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1202                                         an.SetPublicKey (encodedPublicKey);
1203                                 }
1204                         }
1205                         catch (Exception) {
1206                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
1207                                 Environment.Exit (1);
1208                         }
1209                 }
1210
1211                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1212                 public AssemblyName GetAssemblyName (string name, string output)
1213                 {
1214                         if (OptAttributes != null) {
1215                                 foreach (Attribute a in OptAttributes.Attrs) {
1216                                         // cannot rely on any resolve-based members before you call Resolve
1217                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1218                                                 continue;
1219
1220                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
1221                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
1222                                         //       are loaded yet.
1223                                         // TODO: Does not handle quoted attributes properly
1224                                         switch (a.Name) {
1225                                         case "AssemblyKeyFile":
1226                                         case "AssemblyKeyFileAttribute":
1227                                         case "System.Reflection.AssemblyKeyFileAttribute":
1228                                                 if (RootContext.StrongNameKeyFile != null) {
1229                                                         Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1230                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1231                                                                         "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1232                                                 } else {
1233                                                         string value = a.GetString ();
1234                                                         if (value.Length != 0)
1235                                                                 RootContext.StrongNameKeyFile = value;
1236                                                 }
1237                                                 break;
1238                                         case "AssemblyKeyName":
1239                                         case "AssemblyKeyNameAttribute":
1240                                         case "System.Reflection.AssemblyKeyNameAttribute":
1241                                                 if (RootContext.StrongNameKeyContainer != null) {
1242                                                         Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1243                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1244                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
1245                                                 } else {
1246                                                         string value = a.GetString ();
1247                                                         if (value.Length != 0)
1248                                                                 RootContext.StrongNameKeyContainer = value;
1249                                                 }
1250                                                 break;
1251                                         case "AssemblyDelaySign":
1252                                         case "AssemblyDelaySignAttribute":
1253                                         case "System.Reflection.AssemblyDelaySignAttribute":
1254                                                 RootContext.StrongNameDelaySign = a.GetBoolean ();
1255                                                 break;
1256                                         }
1257                                 }
1258                         }
1259
1260                         AssemblyName an = new AssemblyName ();
1261                         an.Name = Path.GetFileNameWithoutExtension (name);
1262
1263                         // note: delay doesn't apply when using a key container
1264                         if (RootContext.StrongNameKeyContainer != null) {
1265                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1266                                 return an;
1267                         }
1268
1269                         // strongname is optional
1270                         if (RootContext.StrongNameKeyFile == null)
1271                                 return an;
1272
1273                         string AssemblyDir = Path.GetDirectoryName (output);
1274
1275                         // the StrongName key file may be relative to (a) the compiled
1276                         // file or (b) to the output assembly. See bugzilla #55320
1277                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1278
1279                         // (a) relative to the compiled file
1280                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1281                         bool exist = File.Exists (filename);
1282                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1283                                 // (b) relative to the outputed assembly
1284                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1285                                 exist = File.Exists (filename);
1286                         }
1287
1288                         if (exist) {
1289                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1290                                         byte[] snkeypair = new byte [fs.Length];
1291                                         fs.Read (snkeypair, 0, snkeypair.Length);
1292
1293                                         if (RootContext.StrongNameDelaySign) {
1294                                                 // delayed signing - DO NOT include private key
1295                                                 SetPublicKey (an, snkeypair);
1296                                         }
1297                                         else {
1298                                                 // no delay so we make sure we have the private key
1299                                                 try {
1300                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1301                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1302                                                 }
1303                                                 catch (CryptographicException) {
1304                                                         if (snkeypair.Length == 16) {
1305                                                                 // error # is different for ECMA key
1306                                                                 Report.Error (1606, "Could not sign the assembly. " +
1307                                                                         "ECMA key can only be used to delay-sign assemblies");
1308                                                         }
1309                                                         else {
1310                                                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not have a private key");
1311                                                         }
1312                                                         return null;
1313                                                 }
1314                                         }
1315                                 }
1316                         }
1317                         else {
1318                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not exist");
1319                                 return null;
1320                         }
1321                         return an;
1322                 }
1323
1324                 void Error_AssemblySigning (string text)
1325                 {
1326                         Report.Error (1548, "Error during assembly signing. " + text);
1327                 }
1328
1329                 bool CheckInternalsVisibleAttribute (Attribute a)
1330                 {
1331                         string assembly_name = a.GetString ();
1332                         if (assembly_name.Length == 0)
1333                                 return false;
1334
1335                         AssemblyName aname = null;
1336                         try {
1337 #if GMCS_SOURCE
1338                                 aname = new AssemblyName (assembly_name);
1339 #else
1340                                 throw new NotSupportedException ();
1341 #endif
1342                         } catch (FileLoadException) {
1343                         } catch (ArgumentException) {
1344                         }
1345
1346                         // Bad assembly name format
1347                         if (aname == null)
1348                                 Report.Warning (1700, 3, a.Location, "Assembly reference `" + assembly_name + "' is invalid and cannot be resolved");
1349                         // Report error if we have defined Version or Culture
1350                         else if (aname.Version != null || aname.CultureInfo != null)
1351                                 throw new Exception ("Friend assembly `" + a.GetString () +
1352                                                 "' is invalid. InternalsVisibleTo cannot have version or culture specified.");
1353                         else if (aname.GetPublicKey () == null && Name.GetPublicKey () != null && Name.GetPublicKey ().Length != 0) {
1354                                 Report.Error (1726, a.Location, "Friend assembly reference `" + aname.FullName + "' is invalid." +
1355                                                 " Strong named assemblies must specify a public key in their InternalsVisibleTo declarations");
1356                                 return false;
1357                         }
1358
1359                         return true;
1360                 }
1361
1362                 static bool IsValidAssemblyVersion (string version)
1363                 {
1364                         Version v;
1365                         try {
1366                                 v = new Version (version);
1367                         } catch {
1368                                 try {
1369                                         int major = int.Parse (version, CultureInfo.InvariantCulture);
1370                                         v = new Version (major, 0);
1371                                 } catch {
1372                                         return false;
1373                                 }
1374                         }
1375
1376                         foreach (int candidate in new int [] { v.Major, v.Minor, v.Build, v.Revision }) {
1377                                 if (candidate > ushort.MaxValue)
1378                                         return false;
1379                         }
1380
1381                         return true;
1382                 }
1383
1384                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
1385                 {
1386                         if (a.IsValidSecurityAttribute ()) {
1387                                 if (declarative_security == null)
1388                                         declarative_security = new ListDictionary ();
1389
1390                                 a.ExtractSecurityPermissionSet (declarative_security);
1391                                 return;
1392                         }
1393
1394                         if (a.Type == pa.AssemblyCulture) {
1395                                 string value = a.GetString ();
1396                                 if (value == null || value.Length == 0)
1397                                         return;
1398
1399                                 if (RootContext.Target == Target.Exe) {
1400                                         a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
1401                                         return;
1402                                 }
1403                         }
1404
1405                         if (a.Type == pa.AssemblyVersion) {
1406                                 string value = a.GetString ();
1407                                 if (value == null || value.Length == 0)
1408                                         return;
1409
1410                                 value = value.Replace ('*', '0');
1411
1412                                 if (!IsValidAssemblyVersion (value)) {
1413                                         a.Error_AttributeEmitError (string.Format ("Specified version `{0}' is not valid", value));
1414                                         return;
1415                                 }
1416                         }
1417
1418                         if (a.Type == pa.InternalsVisibleTo && !CheckInternalsVisibleAttribute (a))
1419                                 return;
1420
1421                         if (a.Type == pa.TypeForwarder) {
1422                                 Type t = a.GetArgumentType ();
1423                                 if (t == null || TypeManager.HasElementType (t)) {
1424                                         Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
1425                                         return;
1426                                 }
1427
1428                                 if (emitted_forwarders == null) {
1429                                         emitted_forwarders = new ListDictionary();
1430                                 } else if (emitted_forwarders.Contains(t)) {
1431                                         Report.SymbolRelatedToPreviousError(((Attribute)emitted_forwarders[t]).Location, null);
1432                                         Report.Error(739, a.Location, "A duplicate type forward of type `{0}'",
1433                                                 TypeManager.CSharpName(t));
1434                                         return;
1435                                 }
1436
1437                                 emitted_forwarders.Add(t, a);
1438
1439                                 if (TypeManager.LookupDeclSpace (t) != null) {
1440                                         Report.SymbolRelatedToPreviousError (t);
1441                                         Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
1442                                                 TypeManager.CSharpName (t));
1443                                         return;
1444                                 }
1445
1446                                 if (t.DeclaringType != null) {
1447                                         Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
1448                                                 TypeManager.CSharpName (t));
1449                                         return;
1450                                 }
1451
1452                                 if (TypeManager.IsGenericType (t)) {
1453                                         Report.Error (733, a.Location, "Cannot forward generic type `{0}'", TypeManager.CSharpName (t));
1454                                         return;
1455                                 }
1456
1457                                 if (add_type_forwarder == null) {
1458                                         add_type_forwarder = typeof (AssemblyBuilder).GetMethod ("AddTypeForwarder",
1459                                                 BindingFlags.NonPublic | BindingFlags.Instance);
1460
1461                                         if (add_type_forwarder == null) {
1462                                                 Report.RuntimeMissingSupport (a.Location, "TypeForwardedTo attribute");
1463                                                 return;
1464                                         }
1465                                 }
1466
1467                                 add_type_forwarder.Invoke (Builder, new object[] { t });
1468                                 return;
1469                         }
1470
1471                         if (a.Type == pa.Extension) {
1472                                 a.Error_MisusedExtensionAttribute ();
1473                                 return;
1474                         }
1475
1476                         Builder.SetCustomAttribute (cb);
1477                 }
1478
1479                 public override void Emit (TypeContainer tc)
1480                 {
1481                         base.Emit (tc);
1482
1483                         if (has_extension_method)
1484                                 PredefinedAttributes.Get.Extension.EmitAttribute (Builder);
1485
1486                         // FIXME: Does this belong inside SRE.AssemblyBuilder instead?
1487                         PredefinedAttribute pa = PredefinedAttributes.Get.RuntimeCompatibility;
1488                         if (pa.IsDefined && (OptAttributes == null || !OptAttributes.Contains (pa))) {
1489                                 ConstructorInfo ci = TypeManager.GetPredefinedConstructor (
1490                                         pa.Type, Location.Null, Type.EmptyTypes);
1491                                 PropertyInfo [] pis = new PropertyInfo [1];
1492                                 pis [0] = TypeManager.GetPredefinedProperty (pa.Type,
1493                                         "WrapNonExceptionThrows", Location.Null, TypeManager.bool_type);
1494                                 object [] pargs = new object [1];
1495                                 pargs [0] = true;
1496                                 Builder.SetCustomAttribute (new CustomAttributeBuilder (ci, new object [0], pis, pargs));
1497                         }
1498
1499                         if (declarative_security != null) {
1500
1501                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1502                                 object builder_instance = Builder;
1503
1504                                 try {
1505                                         // Microsoft runtime hacking
1506                                         if (add_permission == null) {
1507                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1508                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1509
1510                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1511                                                 builder_instance = fi.GetValue (Builder);
1512                                         }
1513
1514                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1515                                                                                                   declarative_security [SecurityAction.RequestOptional],
1516                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1517                                         add_permission.Invoke (builder_instance, args);
1518                                 }
1519                                 catch {
1520                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1521                                 }
1522                         }
1523                 }
1524
1525                 public override string[] ValidAttributeTargets {
1526                         get {
1527                                 return attribute_targets;
1528                         }
1529                 }
1530
1531                 // Wrapper for AssemblyBuilder.AddModule
1532                 static MethodInfo adder_method;
1533                 static public MethodInfo AddModule_Method {
1534                         get {
1535                                 if (adder_method == null)
1536                                         adder_method = typeof (AssemblyBuilder).GetMethod ("AddModule", BindingFlags.Instance|BindingFlags.NonPublic);
1537                                 return adder_method;
1538                         }
1539                 }
1540                 public Module AddModule (string module)
1541                 {
1542                         MethodInfo m = AddModule_Method;
1543                         if (m == null) {
1544                                 Report.RuntimeMissingSupport (Location.Null, "/addmodule");
1545                                 Environment.Exit (1);
1546                         }
1547
1548                         try {
1549                                 return (Module) m.Invoke (Builder, new object [] { module });
1550                         } catch (TargetInvocationException ex) {
1551                                 throw ex.InnerException;
1552                         }
1553                 }
1554         }
1555 }