mcs/class/Mono.Debugger.Soft/Mono.Debugger.Soft/VirtualMachine.cs

   1 using System;
   2 using System.IO;
   3 using System.Threading;
   4 using System.Net;
   5 using System.Diagnostics;
   6 using System.Collections;
   7 using System.Collections.Generic;
   8 using Mono.Cecil.Metadata;
   9
  10 namespace Mono.Debugger.Soft
  11 {
  12         public class VirtualMachine : Mirror
  13         {
  14                 Queue queue;
  15                 object queue_monitor;
  16                 object startup_monitor;
  17                 AppDomainMirror root_domain;
  18                 Dictionary<int, EventRequest> requests;
  19                 ITargetProcess process;
  20
  21                 internal Connection conn;
  22
  23                 VersionInfo version;
  24
  25                 internal VirtualMachine (ITargetProcess process, Connection conn) : base () {
  26                         SetVirtualMachine (this);
  27                         queue = new Queue ();
  28                         queue_monitor = new Object ();
  29                         startup_monitor = new Object ();
  30                         requests = new Dictionary <int, EventRequest> ();
  31                         this.conn = conn;
  32                         this.process = process;
  33                         conn.ErrorHandler += ErrorHandler;
  34                 }
  35
  36                 // The standard output of the process is available normally through Process
  37                 public StreamReader StandardOutput { get; set; }
  38                 public StreamReader StandardError { get; set; }
  39
  40
  41                 public Process Process {
  42                         get {
  43                                 ProcessWrapper pw = process as ProcessWrapper;
  44                                 if (pw == null)
  45                                     throw new InvalidOperationException ("Process instance not available");
  46                                 return pw.Process;
  47                         }
  48                 }
  49
  50                 public ITargetProcess TargetProcess {
  51                         get {
  52                                 return process;
  53                         }
  54                 }
  55
  56                 public AppDomainMirror RootDomain {
  57                         get {
  58                                 return root_domain;
  59                         }
  60             }
  61
  62                 public EndPoint EndPoint {
  63                         get {
  64                                 var tcpConn = conn as TcpConnection;
  65                                 if (tcpConn != null)
  66                                         return tcpConn.EndPoint;
  67                                 return null;
  68                         }
  69                 }
  70
  71                 public VersionInfo Version {
  72                         get {
  73                                 return version;
  74                         }
  75                 }
  76
  77                 EventSet current_es;
  78                 int current_es_index;
  79
  80                 /*
  81                  * It is impossible to determine when to resume when using this method, since
  82                  * the debuggee is suspended only once per event-set, not event.
  83                  */
  84                 [Obsolete ("Use GetNextEventSet () instead")]
  85                 public Event GetNextEvent () {
  86                         lock (queue_monitor) {
  87                                 if (current_es == null || current_es_index == current_es.Events.Length) {
  88                                         if (queue.Count == 0)
  89                                                 Monitor.Wait (queue_monitor);
  90                                         current_es = (EventSet)queue.Dequeue ();
  91                                         current_es_index = 0;
  92                                 }
  93                                 return current_es.Events [current_es_index ++];
  94                         }
  95                 }
  96
  97                 public Event GetNextEvent (int timeout) {
  98                         throw new NotImplementedException ();
  99                 }
 100
 101                 public EventSet GetNextEventSet () {
 102                         lock (queue_monitor) {
 103                                 if (queue.Count == 0)
 104                                         Monitor.Wait (queue_monitor);
 105
 106                                 current_es = null;
 107                                 current_es_index = 0;
 108
 109                                 return (EventSet)queue.Dequeue ();
 110                         }
 111                 }
 112
 113                 [Obsolete ("Use GetNextEventSet () instead")]
 114                 public T GetNextEvent<T> () where T : Event {
 115                         return GetNextEvent () as T;
 116                 }
 117
 118                 public void Suspend () {
 119                         conn.VM_Suspend ();
 120             }
 121
 122                 public void Resume () {
 123                         try {
 124                                 conn.VM_Resume ();
 125                         } catch (CommandException ex) {
 126                                 if (ex.ErrorCode == ErrorCode.NOT_SUSPENDED)
 127                                         throw new InvalidOperationException ("The vm is not suspended.");
 128                                 else
 129                                         throw;
 130                         }
 131             }
 132
 133                 public void Exit (int exitCode) {
 134                         conn.VM_Exit (exitCode);
 135                 }
 136
 137                 public void Dispose () {
 138                         conn.VM_Dispose ();
 139                         conn.Close ();
 140                         conn.Dispose ();
 141                         notify_vm_event (EventType.VMDisconnect, SuspendPolicy.None, 0, 0, null);
 142                 }
 143
 144                 public IList<ThreadMirror> GetThreads () {
 145                         long[] ids = vm.conn.VM_GetThreads ();
 146                         ThreadMirror[] res = new ThreadMirror [ids.Length];
 147                         for (int i = 0; i < ids.Length; ++i)
 148                                 res [i] = GetThread (ids [i]);
 149                         return res;
 150                 }
 151
 152                 // Same as the mirrorOf methods in JDI
 153                 public PrimitiveValue CreateValue (object value) {
 154                         if (value == null)
 155                                 return new PrimitiveValue (vm, null);
 156
 157                         if (!value.GetType ().IsPrimitive)
 158                                 throw new ArgumentException ("value must be of a primitive type instead of '" + value.GetType () + "'", "value");
 159
 160                         return new PrimitiveValue (vm, value);
 161                 }
 162
 163                 public EnumMirror CreateEnumMirror (TypeMirror type, PrimitiveValue value) {
 164                         return new EnumMirror (this, type, value);
 165                 }
 166
 167                 //
 168                 // Enable send and receive timeouts on the connection and send a keepalive event
 169                 // every 'keepalive_interval' milliseconds.
 170                 //
 171
 172                 public void SetSocketTimeouts (int send_timeout, int receive_timeout, int keepalive_interval)
 173                 {
 174                         conn.SetSocketTimeouts (send_timeout, receive_timeout, keepalive_interval);
 175                 }
 176
 177                 //
 178                 // Methods to create event request objects
 179                 //
 180                 public BreakpointEventRequest CreateBreakpointRequest (MethodMirror method, long il_offset) {
 181                         return new BreakpointEventRequest (this, method, il_offset);
 182                 }
 183
 184                 public BreakpointEventRequest CreateBreakpointRequest (Location loc) {
 185                         if (loc == null)
 186                                 throw new ArgumentNullException ("loc");
 187                         CheckMirror (loc);
 188                         return new BreakpointEventRequest (this, loc.Method, loc.ILOffset);
 189                 }
 190
 191                 public StepEventRequest CreateStepRequest (ThreadMirror thread) {
 192                         return new StepEventRequest (this, thread);
 193                 }
 194
 195                 public MethodEntryEventRequest CreateMethodEntryRequest () {
 196                         return new MethodEntryEventRequest (this);
 197                 }
 198
 199                 public MethodExitEventRequest CreateMethodExitRequest () {
 200                         return new MethodExitEventRequest (this);
 201                 }
 202
 203                 public ExceptionEventRequest CreateExceptionRequest (TypeMirror exc_type) {
 204                         return new ExceptionEventRequest (this, exc_type, true, true);
 205                 }
 206
 207                 public ExceptionEventRequest CreateExceptionRequest (TypeMirror exc_type, bool caught, bool uncaught) {
 208                         return new ExceptionEventRequest (this, exc_type, caught, uncaught);
 209                 }
 210
 211                 public AssemblyLoadEventRequest CreateAssemblyLoadRequest () {
 212                         return new AssemblyLoadEventRequest (this);
 213                 }
 214
 215                 public TypeLoadEventRequest CreateTypeLoadRequest () {
 216                         return new TypeLoadEventRequest (this);
 217                 }
 218
 219                 public void EnableEvents (params EventType[] events) {
 220                         foreach (EventType etype in events) {
 221                                 if (etype == EventType.Breakpoint)
 222                                         throw new ArgumentException ("Breakpoint events cannot be requested using EnableEvents", "events");
 223                                 conn.EnableEvent (etype, SuspendPolicy.All, null);
 224                         }
 225                 }
 226
 227                 public BreakpointEventRequest SetBreakpoint (MethodMirror method, long il_offset) {
 228                         BreakpointEventRequest req = CreateBreakpointRequest (method, il_offset);
 229
 230                         req.Enable ();
 231
 232                         return req;
 233                 }
 234
 235                 public void ClearAllBreakpoints () {
 236                         conn.ClearAllBreakpoints ();
 237                 }
 238
 239                 public void Disconnect () {
 240                         conn.Close ();
 241                 }
 242
 243                 //
 244                 // Return a list of TypeMirror objects for all loaded types which reference the
 245                 // source file FNAME. Might return false positives.
 246                 // Since protocol version 2.7.
 247                 //
 248                 public IList<TypeMirror> GetTypesForSourceFile (string fname, bool ignoreCase) {
 249                         long[] ids = conn.VM_GetTypesForSourceFile (fname, ignoreCase);
 250                         var res = new TypeMirror [ids.Length];
 251                         for (int i = 0; i < ids.Length; ++i)
 252                                 res [i] = GetType (ids [i]);
 253                         return res;
 254                 }
 255
 256                 //
 257                 // Return a list of TypeMirror objects for all loaded types named 'NAME'.
 258                 // NAME should be in the the same for as with Assembly.GetType ().
 259                 // Since protocol version 2.9.
 260                 //
 261                 public IList<TypeMirror> GetTypes (string name, bool ignoreCase) {
 262                         long[] ids = conn.VM_GetTypes (name, ignoreCase);
 263                         var res = new TypeMirror [ids.Length];
 264                         for (int i = 0; i < ids.Length; ++i)
 265                                 res [i] = GetType (ids [i]);
 266                         return res;
 267                 }
 268
 269                 internal void queue_event_set (EventSet es) {
 270                         lock (queue_monitor) {
 271                                 queue.Enqueue (es);
 272                                 Monitor.Pulse (queue_monitor);
 273                         }
 274                 }
 275
 276                 internal void ErrorHandler (object sender, ErrorHandlerEventArgs args) {
 277                         switch (args.ErrorCode) {
 278                         case ErrorCode.INVALID_OBJECT:
 279                                 throw new ObjectCollectedException ();
 280                         case ErrorCode.INVALID_FRAMEID:
 281                                 throw new InvalidStackFrameException ();
 282                         case ErrorCode.NOT_SUSPENDED:
 283                                 throw new InvalidOperationException ("The vm is not suspended.");
 284                         case ErrorCode.NOT_IMPLEMENTED:
 285                                 throw new NotSupportedException ("This request is not supported by the protocol version implemented by the debuggee.");
 286                         case ErrorCode.ABSENT_INFORMATION:
 287                                 throw new AbsentInformationException ();
 288                         case ErrorCode.NO_SEQ_POINT_AT_IL_OFFSET:
 289                                 throw new ArgumentException ("Cannot set breakpoint on the specified IL offset.");
 290                         default:
 291                                 throw new CommandException (args.ErrorCode);
 292                         }
 293                 }
 294
 295                 /* Wait for the debuggee to start up and connect to it */
 296                 internal void connect () {
 297                         conn.Connect ();
 298
 299                         // Test the connection
 300                         version = conn.Version;
 301                         if (version.MajorVersion != Connection.MAJOR_VERSION)
 302                                 throw new NotSupportedException (String.Format ("The debuggee implements protocol version {0}.{1}, while {2}.{3} is required.", version.MajorVersion, version.MinorVersion, Connection.MAJOR_VERSION, Connection.MINOR_VERSION));
 303
 304                         long root_domain_id = conn.RootDomain;
 305                         root_domain = GetDomain (root_domain_id);
 306                 }
 307
 308                 internal void notify_vm_event (EventType evtype, SuspendPolicy spolicy, int req_id, long thread_id, string vm_uri) {
 309                         //Console.WriteLine ("Event: " + evtype + "(" + vm_uri + ")");
 310
 311                         switch (evtype) {
 312                         case EventType.VMStart:
 313                                 /* Notify the main thread that the debuggee started up */
 314                                 lock (startup_monitor) {
 315                                         Monitor.Pulse (startup_monitor);
 316                                 }
 317                                 queue_event_set (new EventSet (this, spolicy, new Event[] { new VMStartEvent (vm, req_id, thread_id) }));
 318                                 break;
 319                         case EventType.VMDeath:
 320                                 queue_event_set (new EventSet (this, spolicy, new Event[] { new VMDeathEvent (vm, req_id) }));
 321                                 break;
 322                         case EventType.VMDisconnect:
 323                                 queue_event_set (new EventSet (this, spolicy, new Event[] { new VMDisconnectEvent (vm, req_id) }));
 324                                 break;
 325                         default:
 326                                 throw new Exception ();
 327                         }
 328                 }
 329
 330                 //
 331                 // Methods to create instances of mirror objects
 332                 //
 333
 334                 /*
 335                 class MirrorCache<T> {
 336                         static Dictionary <long, T> mirrors;
 337                         static object mirror_lock = new object ();
 338
 339                         internal static T GetMirror (VirtualMachine vm, long id) {
 340                                 lock (mirror_lock) {
 341                                 if (mirrors == null)
 342                                         mirrors = new Dictionary <long, T> ();
 343                                 T obj;
 344                                 if (!mirrors.TryGetValue (id, out obj)) {
 345                                         obj = CreateMirror (vm, id);
 346                                         mirrors [id] = obj;
 347                                 }
 348                                 return obj;
 349                                 }
 350                         }
 351
 352                         internal static T CreateMirror (VirtualMachine vm, long id) {
 353                         }
 354                 }
 355                 */
 356
 357                 // FIXME: When to remove items from the cache ?
 358
 359                 Dictionary <long, MethodMirror> methods;
 360                 object methods_lock = new object ();
 361
 362                 internal MethodMirror GetMethod (long id) {
 363                         lock (methods_lock) {
 364                                 if (methods == null)
 365                                         methods = new Dictionary <long, MethodMirror> ();
 366                                 MethodMirror obj;
 367                                 if (id == 0)
 368                                         return null;
 369                                 if (!methods.TryGetValue (id, out obj)) {
 370                                         obj = new MethodMirror (this, id);
 371                                         methods [id] = obj;
 372                                 }
 373                                 return obj;
 374                         }
 375             }
 376
 377                 Dictionary <long, AssemblyMirror> assemblies;
 378                 object assemblies_lock = new object ();
 379
 380                 internal AssemblyMirror GetAssembly (long id) {
 381                         lock (assemblies_lock) {
 382                                 if (assemblies == null)
 383                                         assemblies = new Dictionary <long, AssemblyMirror> ();
 384                                 AssemblyMirror obj;
 385                                 if (id == 0)
 386                                         return null;
 387                                 if (!assemblies.TryGetValue (id, out obj)) {
 388                                         obj = new AssemblyMirror (this, id);
 389                                         assemblies [id] = obj;
 390                                 }
 391                                 return obj;
 392                         }
 393             }
 394
 395                 Dictionary <long, ModuleMirror> modules;
 396                 object modules_lock = new object ();
 397
 398                 internal ModuleMirror GetModule (long id) {
 399                         lock (modules_lock) {
 400                                 if (modules == null)
 401                                         modules = new Dictionary <long, ModuleMirror> ();
 402                                 ModuleMirror obj;
 403                                 if (id == 0)
 404                                         return null;
 405                                 if (!modules.TryGetValue (id, out obj)) {
 406                                         obj = new ModuleMirror (this, id);
 407                                         modules [id] = obj;
 408                                 }
 409                                 return obj;
 410                         }
 411             }
 412
 413                 Dictionary <long, AppDomainMirror> domains;
 414                 object domains_lock = new object ();
 415
 416                 internal AppDomainMirror GetDomain (long id) {
 417                         lock (domains_lock) {
 418                                 if (domains == null)
 419                                         domains = new Dictionary <long, AppDomainMirror> ();
 420                                 AppDomainMirror obj;
 421                                 if (id == 0)
 422                                         return null;
 423                                 if (!domains.TryGetValue (id, out obj)) {
 424                                         obj = new AppDomainMirror (this, id);
 425                                         domains [id] = obj;
 426                                 }
 427                                 return obj;
 428                         }
 429             }
 430
 431                 Dictionary <long, TypeMirror> types;
 432                 object types_lock = new object ();
 433
 434                 internal TypeMirror GetType (long id) {
 435                         lock (types_lock) {
 436                                 if (types == null)
 437                                         types = new Dictionary <long, TypeMirror> ();
 438                                 TypeMirror obj;
 439                                 if (id == 0)
 440                                         return null;
 441                                 if (!types.TryGetValue (id, out obj)) {
 442                                         obj = new TypeMirror (this, id);
 443                                         types [id] = obj;
 444                                 }
 445                                 return obj;
 446                         }
 447             }
 448
 449                 internal TypeMirror[] GetTypes (long[] ids) {
 450                         var res = new TypeMirror [ids.Length];
 451                         for (int i = 0; i < ids.Length; ++i)
 452                                 res [i] = GetType (ids [i]);
 453                         return res;
 454                 }
 455
 456                 Dictionary <long, ObjectMirror> objects;
 457                 object objects_lock = new object ();
 458
 459                 internal T GetObject<T> (long id, long domain_id, long type_id) where T : ObjectMirror {
 460                         lock (objects_lock) {
 461                                 if (objects == null)
 462                                         objects = new Dictionary <long, ObjectMirror> ();
 463                                 ObjectMirror obj;
 464                                 if (!objects.TryGetValue (id, out obj)) {
 465                                         /*
 466                                          * Obtain the domain/type of the object to determine the type of
 467                                          * object we need to create.
 468                                          */
 469                                         if (domain_id == 0 || type_id == 0) {
 470                                                 if (conn.Version.AtLeast (2, 5)) {
 471                                                         var info = conn.Object_GetInfo (id);
 472                                                         domain_id = info.domain_id;
 473                                                         type_id = info.type_id;
 474                                                 } else {
 475                                                         if (domain_id == 0)
 476                                                                 domain_id = conn.Object_GetDomain (id);
 477                                                         if (type_id == 0)
 478                                                                 type_id = conn.Object_GetType (id);
 479                                                 }
 480                                         }
 481                                         AppDomainMirror d = GetDomain (domain_id);
 482                                         TypeMirror t = GetType (type_id);
 483
 484                                         if (t.Assembly == d.Corlib && t.Namespace == "System.Threading" && t.Name == "Thread")
 485                                                 obj = new ThreadMirror (this, id, t, d);
 486                                         else if (t.Assembly == d.Corlib && t.Namespace == "System" && t.Name == "String")
 487                                                 obj = new StringMirror (this, id, t, d);
 488                                         else if (typeof (T) == typeof (ArrayMirror))
 489                                                 obj = new ArrayMirror (this, id, t, d);
 490                                         else
 491                                                 obj = new ObjectMirror (this, id, t, d);
 492                                         objects [id] = obj;
 493                                 }
 494                                 return (T)obj;
 495                         }
 496             }
 497
 498                 internal T GetObject<T> (long id) where T : ObjectMirror {
 499                         return GetObject<T> (id, 0, 0);
 500                 }
 501
 502                 internal ObjectMirror GetObject (long objid) {
 503                         return GetObject<ObjectMirror> (objid);
 504                 }
 505
 506                 internal ThreadMirror GetThread (long id) {
 507                         return GetObject <ThreadMirror> (id);
 508                 }
 509
 510                 object requests_lock = new object ();
 511
 512                 internal void AddRequest (EventRequest req, int id) {
 513                         lock (requests_lock) {
 514                                 requests [id] = req;
 515                         }
 516                 }
 517
 518                 internal void RemoveRequest (EventRequest req, int id) {
 519                         lock (requests_lock) {
 520                                 requests.Remove (id);
 521                         }
 522                 }
 523
 524                 internal EventRequest GetRequest (int id) {
 525                         lock (requests_lock) {
 526                                 return requests [id];
 527                         }
 528                 }
 529
 530                 internal Value DecodeValue (ValueImpl v) {
 531                         if (v.Value != null)
 532                                 return new PrimitiveValue (this, v.Value);
 533
 534                         switch (v.Type) {
 535                         case ElementType.Void:
 536                                 return null;
 537                         case ElementType.SzArray:
 538                         case ElementType.Array:
 539                                 return GetObject<ArrayMirror> (v.Objid);
 540                         case ElementType.String:
 541                                 return GetObject<StringMirror> (v.Objid);
 542                         case ElementType.Class:
 543                         case ElementType.Object:
 544                                 return GetObject (v.Objid);
 545                         case ElementType.ValueType:
 546                                 if (v.IsEnum)
 547                                         return new EnumMirror (this, GetType (v.Klass), DecodeValues (v.Fields));
 548                                 else
 549                                         return new StructMirror (this, GetType (v.Klass), DecodeValues (v.Fields));
 550                         case (ElementType)ValueTypeId.VALUE_TYPE_ID_NULL:
 551                                 return new PrimitiveValue (this, null);
 552                         default:
 553                                 throw new NotImplementedException ("" + v.Type);
 554                         }
 555                 }
 556
 557                 internal Value[] DecodeValues (ValueImpl[] values) {
 558                         Value[] res = new Value [values.Length];
 559                         for (int i = 0; i < values.Length; ++i)
 560                                 res [i] = DecodeValue (values [i]);
 561                         return res;
 562                 }
 563
 564                 internal ValueImpl EncodeValue (Value v) {
 565                         if (v is PrimitiveValue) {
 566                                 object val = (v as PrimitiveValue).Value;
 567                                 if (val == null)
 568                                         return new ValueImpl { Type = (ElementType)ValueTypeId.VALUE_TYPE_ID_NULL, Objid = 0 };
 569                                 else
 570                                         return new ValueImpl { Value = val };
 571                         } else if (v is ObjectMirror) {
 572                                 return new ValueImpl { Type = ElementType.Object, Objid = (v as ObjectMirror).Id };
 573                         } else if (v is StructMirror) {
 574                                 return new ValueImpl { Type = ElementType.ValueType, Klass = (v as StructMirror).Type.Id, Fields = EncodeValues ((v as StructMirror).Fields) };
 575                         } else {
 576                                 throw new NotSupportedException ();
 577                         }
 578                 }
 579
 580                 internal ValueImpl[] EncodeValues (IList<Value> values) {
 581                         ValueImpl[] res = new ValueImpl [values.Count];
 582                         for (int i = 0; i < values.Count; ++i)
 583                                 res [i] = EncodeValue (values [i]);
 584                         return res;
 585                 }
 586
 587                 internal void CheckProtocolVersion (int major, int minor) {
 588                         if (!conn.Version.AtLeast (major, minor))
 589                                 throw new NotSupportedException ("This request is not supported by the protocol version implemented by the debuggee.");
 590                 }
 591     }
 592
 593         class EventHandler : MarshalByRefObject, IEventHandler
 594         {
 595                 VirtualMachine vm;
 596
 597                 public EventHandler (VirtualMachine vm) {
 598                         this.vm = vm;
 599                 }
 600
 601                 public void Events (SuspendPolicy suspend_policy, EventInfo[] events) {
 602                         var l = new List<Event> ();
 603
 604                         for (int i = 0; i < events.Length; ++i) {
 605                                 EventInfo ei = events [i];
 606                                 int req_id = ei.ReqId;
 607                                 long thread_id = ei.ThreadId;
 608                                 long id = ei.Id;
 609                                 long loc = ei.Location;
 610
 611                                 switch (ei.EventType) {
 612                                 case EventType.VMStart:
 613                                         vm.notify_vm_event (EventType.VMStart, suspend_policy, req_id, thread_id, null);
 614                                         break;
 615                                 case EventType.VMDeath:
 616                                         vm.notify_vm_event (EventType.VMDeath, suspend_policy, req_id, thread_id, null);
 617                                         break;
 618                                 case EventType.ThreadStart:
 619                                         l.Add (new ThreadStartEvent (vm, req_id, id));
 620                                         break;
 621                                 case EventType.ThreadDeath:
 622                                         l.Add (new ThreadDeathEvent (vm, req_id, id));
 623                                         break;
 624                                 case EventType.AssemblyLoad:
 625                                         l.Add (new AssemblyLoadEvent (vm, req_id, thread_id, id));
 626                                         break;
 627                                 case EventType.AssemblyUnload:
 628                                         l.Add (new AssemblyUnloadEvent (vm, req_id, thread_id, id));
 629                                         break;
 630                                 case EventType.TypeLoad:
 631                                         l.Add (new TypeLoadEvent (vm, req_id, thread_id, id));
 632                                         break;
 633                                 case EventType.MethodEntry:
 634                                         l.Add (new MethodEntryEvent (vm, req_id, thread_id, id));
 635                                         break;
 636                                 case EventType.MethodExit:
 637                                         l.Add (new MethodExitEvent (vm, req_id, thread_id, id));
 638                                         break;
 639                                 case EventType.Breakpoint:
 640                                         l.Add (new BreakpointEvent (vm, req_id, thread_id, id, loc));
 641                                         break;
 642                                 case EventType.Step:
 643                                         l.Add (new StepEvent (vm, req_id, thread_id, id, loc));
 644                                         break;
 645                                 case EventType.Exception:
 646                                         l.Add (new ExceptionEvent (vm, req_id, thread_id, id, loc));
 647                                         break;
 648                                 case EventType.AppDomainCreate:
 649                                         l.Add (new AppDomainCreateEvent (vm, req_id, thread_id, id));
 650                                         break;
 651                                 case EventType.AppDomainUnload:
 652                                         l.Add (new AppDomainUnloadEvent (vm, req_id, thread_id, id));
 653                                         break;
 654                                 case EventType.UserBreak:
 655                                         l.Add (new UserBreakEvent (vm, req_id, thread_id));
 656                                         break;
 657                                 case EventType.UserLog:
 658                                         l.Add (new UserLogEvent (vm, req_id, thread_id, ei.Level, ei.Category, ei.Message));
 659                                         break;
 660                                 default:
 661                                         break;
 662                                 }
 663                         }
 664
 665                         if (l.Count > 0)
 666                                 vm.queue_event_set (new EventSet (vm, suspend_policy, l.ToArray ()));
 667                 }
 668
 669                 public void VMDisconnect (int req_id, long thread_id, string vm_uri) {
 670                         vm.notify_vm_event (EventType.VMDisconnect, SuspendPolicy.None, req_id, thread_id, vm_uri);
 671         }
 672     }
 673
 674         internal class CommandException : Exception {
 675
 676                 public CommandException (ErrorCode error_code) : base ("Debuggee returned error code " + error_code + ".") {
 677                         ErrorCode = error_code;
 678                 }
 679
 680                 public ErrorCode ErrorCode {
 681                         get; set;
 682                 }
 683         }
 684 }