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