mcs/class/corlib/System/Exception.cs

   1 //
   2 // System.Exception.cs
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //   Patrik Torstensson
   7 //
   8 // (C) Ximian, Inc.  http://www.ximian.com
   9 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.Collections;
  32 using System.Collections.Generic;
  33 using System.Diagnostics;
  34 using System.Reflection;
  35 using System.Text;
  36 using System.Runtime.InteropServices;
  37 using System.Runtime.CompilerServices;
  38 using System.Runtime.Serialization;
  39 using System.Security.Permissions;
  40
  41 namespace System
  42 {
  43         [Serializable]
  44         [ComVisible(true)]
  45         [ComDefaultInterface (typeof (_Exception))]
  46         [ClassInterface (ClassInterfaceType.None)]
  47         [StructLayout (LayoutKind.Sequential)]
  48 #if MOBILE
  49         public class Exception : ISerializable
  50 #else
  51         public class Exception : ISerializable, _Exception
  52 #endif
  53         {
  54 #pragma warning disable 169, 649
  55                 #region Sync with object-internals.h
  56                 /* Stores the IPs and the generic sharing infos
  57                    (vtable/MRGCTX) of the frames. */
  58                 IntPtr [] trace_ips;
  59                 Exception inner_exception;
  60                 internal string message;
  61                 string help_link;
  62                 string class_name;
  63                 string stack_trace;
  64                 // formerly known as remote_stack_trace (see #425512):
  65                 string _remoteStackTraceString;
  66                 int remote_stack_index;
  67                 internal int hresult = -2146233088;
  68                 string source;
  69                 IDictionary _data;
  70                 StackTrace[] captured_traces;
  71                 IntPtr[] native_trace_ips;
  72                 #endregion
  73 #pragma warning restore 169, 649
  74
  75                 /* Don't add fields here, the runtime depends on the layout of subclasses */
  76
  77                 public Exception ()
  78                 {
  79                 }
  80
  81                 public Exception (string message)
  82                 {
  83                         this.message = message;
  84                 }
  85
  86                 protected Exception (SerializationInfo info, StreamingContext context)
  87                 {
  88                         if (info == null)
  89                                 throw new ArgumentNullException ("info");
  90
  91                         class_name          = info.GetString ("ClassName");
  92                         message             = info.GetString ("Message");
  93                         help_link           = info.GetString ("HelpURL");
  94                         stack_trace         = info.GetString ("StackTraceString");
  95                         _remoteStackTraceString  = info.GetString ("RemoteStackTraceString");
  96                         remote_stack_index  = info.GetInt32  ("RemoteStackIndex");
  97                         hresult             = info.GetInt32  ("HResult");
  98                         source              = info.GetString ("Source");
  99                         inner_exception     = (Exception) info.GetValue ("InnerException", typeof (Exception));
 100
 101                         try {
 102                                 _data = (IDictionary) info.GetValue ("Data", typeof (IDictionary));
 103                         } catch (SerializationException) {
 104                                 // member did not exist in .NET 1.x
 105                         }
 106                 }
 107
 108                 public Exception (string message, Exception innerException)
 109                 {
 110                         inner_exception = innerException;
 111                         this.message = message;
 112                 }
 113
 114                 public Exception InnerException {
 115                         get { return inner_exception; }
 116                 }
 117
 118                 public virtual string HelpLink {
 119                         get { return help_link; }
 120                         set { help_link = value; }
 121                 }
 122
 123                 public int HResult {
 124                         get { return hresult; }
 125                         protected set { hresult = value; }
 126                 }
 127
 128                 internal void SetErrorCode(int hr)
 129                 {
 130                         HResult = hr;
 131                 }
 132
 133                 internal void SetMessage (string s)
 134                 {
 135                         message = s;
 136                 }
 137
 138                 internal void SetStackTrace (string s)
 139                 {
 140                         stack_trace = s;
 141                 }
 142
 143                 string ClassName {
 144                         get {
 145                                 if (class_name == null)
 146                                         class_name = GetType ().ToString ();
 147                                 return class_name;
 148                         }
 149                 }
 150
 151                 public virtual string Message {
 152                         get {
 153                                 if (message == null)
 154                                         message = string.Format (Locale.GetText ("Exception of type '{0}' was thrown."),
 155                                                 ClassName);
 156
 157                                 return message;
 158                         }
 159                 }
 160
 161                 [MonoTODO]
 162                 protected event EventHandler<SafeSerializationEventArgs> SerializeObjectState {
 163                         add {
 164                         }
 165                         remove {
 166                         }
 167                 }
 168
 169                 public virtual string Source {
 170                         get {
 171                                 if (source == null) {
 172                                         StackTrace st = new StackTrace (this, true);
 173                                         if (st.FrameCount > 0) {
 174                                                 StackFrame sf = st.GetFrame (0);
 175                                                 if (st != null) {
 176                                                         MethodBase method = sf.GetMethod ();
 177                                                         if (method != null) {
 178                                                                 source = method.DeclaringType.Assembly.UnprotectedGetName ().Name;
 179                                                         }
 180                                                 }
 181                                         }
 182                                 }
 183
 184                                 // source can be null
 185                                 return source;
 186                         }
 187
 188                         set {
 189                                 source = value;
 190                         }
 191                 }
 192
 193                 bool AddFrames (StringBuilder sb, string newline, string unknown, StackTrace st)
 194                 {
 195                         int i;
 196                         for (i = 0; i < st.FrameCount; i++) {
 197                                 StackFrame frame = st.GetFrame (i);
 198                                 if (i == 0)
 199                                         sb.AppendFormat ("  {0} ", Locale.GetText ("at"));
 200                                 else
 201                                         sb.Append (newline);
 202
 203                                 if (frame.GetMethod () == null) {
 204                                         string internal_name = frame.GetInternalMethodName ();
 205                                         if (internal_name != null)
 206                                                 sb.Append (internal_name);
 207                                         else
 208                                                 sb.AppendFormat ("<0x{0:x5} + 0x{1:x5}> {2}", frame.GetMethodAddress (), frame.GetNativeOffset (), unknown);
 209                                 } else {
 210                                         GetFullNameForStackTrace (sb, frame.GetMethod ());
 211
 212                                         if (frame.GetILOffset () == -1)
 213                                                 sb.AppendFormat ("<0x{0:x5} + 0x{1:x5}> ", frame.GetMethodAddress (), frame.GetNativeOffset ());
 214                                         else
 215                                                 sb.AppendFormat (" [0x{0:x5}] ", frame.GetILOffset ());
 216
 217                                         sb.AppendFormat ("in {0}:{1} ", frame.GetSecureFileName (),
 218                                                                          frame.GetFileLineNumber ());
 219                                 }
 220                         }
 221
 222                         return i != 0;
 223                 }
 224
 225                 public virtual string StackTrace {
 226                         get {
 227                                 if (stack_trace != null)
 228                                         return stack_trace;
 229
 230                                 if (trace_ips == null)
 231                                         /* Not thrown yet */
 232                                         return null;
 233
 234                                 StringBuilder sb = new StringBuilder ();
 235
 236                                 string newline = String.Format ("{0}  {1} ", Environment.NewLine, Locale.GetText ("at"));
 237                                 string unknown = Locale.GetText ("<unknown method>");
 238
 239                                 // Add traces captured using ExceptionDispatchInfo
 240                                 if (captured_traces != null) {
 241                                         foreach (var t in captured_traces) {
 242                                                 if (!AddFrames (sb, newline, unknown, t))
 243                                                         continue;
 244
 245                                                 sb.Append (Environment.NewLine);
 246                                                 sb.Append ("--- End of stack trace from previous location where exception was thrown ---");
 247                                                 sb.Append (Environment.NewLine);
 248                                         }
 249                                 }
 250
 251                                 StackTrace st = new StackTrace (this, 0, true, true);
 252                                 AddFrames (sb, newline, unknown, st);
 253
 254                                 stack_trace = sb.ToString ();
 255
 256                                 return stack_trace;
 257                         }
 258                 }
 259
 260                 public MethodBase TargetSite {
 261                         get {
 262                                 StackTrace st = new StackTrace (this, true);
 263                                 if (st.FrameCount > 0)
 264                                         return st.GetFrame (0).GetMethod ();
 265
 266                                 return null;
 267                         }
 268                 }
 269
 270                 public virtual IDictionary Data {
 271                         get {
 272                                 if (_data == null) {
 273                                         // default to empty dictionary
 274                                         _data = new Dictionary<object, object> ();
 275                                 }
 276                                 return _data;
 277                         }
 278                 }
 279
 280                 public virtual Exception GetBaseException ()
 281                 {
 282                         Exception inner = inner_exception;
 283
 284                         while (inner != null)
 285                         {
 286                                 if (inner.InnerException != null)
 287                                         inner = inner.InnerException;
 288                                 else
 289                                         return inner;
 290                         }
 291
 292                         return this;
 293                 }
 294
 295                 [SecurityPermission (SecurityAction.LinkDemand, SerializationFormatter = true)]
 296                 public virtual void GetObjectData (SerializationInfo info, StreamingContext context)
 297                 {
 298                         if (info == null)
 299                                 throw new ArgumentNullException ("info");
 300
 301                         info.AddValue ("ClassName", ClassName);
 302                         info.AddValue ("Message", message);
 303                         info.AddValue ("InnerException", inner_exception);
 304                         info.AddValue ("HelpURL", help_link);
 305                         info.AddValue ("StackTraceString", StackTrace);
 306                         info.AddValue ("RemoteStackTraceString", _remoteStackTraceString);
 307                         info.AddValue ("RemoteStackIndex", remote_stack_index);
 308                         info.AddValue ("HResult", hresult);
 309                         info.AddValue ("Source", Source);
 310                         info.AddValue ("ExceptionMethod", null);
 311                         info.AddValue ("Data", _data, typeof (IDictionary));
 312                 }
 313
 314                 public override string ToString ()
 315                 {
 316                         System.Text.StringBuilder result = new System.Text.StringBuilder (ClassName);
 317                         result.Append (": ").Append (Message);
 318
 319                         if (null != _remoteStackTraceString)
 320                                 result.Append (_remoteStackTraceString);
 321
 322                         if (inner_exception != null)
 323                         {
 324                                 result.Append (" ---> ").Append (inner_exception.ToString ());
 325                                 result.Append (Environment.NewLine);
 326                                 result.Append (Locale.GetText ("  --- End of inner exception stack trace ---"));
 327                         }
 328
 329                         if (StackTrace != null)
 330                                 result.Append (Environment.NewLine).Append (StackTrace);
 331                         return result.ToString();
 332                 }
 333
 334                 internal Exception FixRemotingException ()
 335                 {
 336                         string message = (0 == remote_stack_index) ?
 337                                 Locale.GetText ("{0}{0}Server stack trace: {0}{1}{0}{0}Exception rethrown at [{2}]: {0}") :
 338                                 Locale.GetText ("{1}{0}{0}Exception rethrown at [{2}]: {0}");
 339                         string tmp = String.Format (message, Environment.NewLine, StackTrace, remote_stack_index);
 340
 341                         _remoteStackTraceString = tmp;
 342                         remote_stack_index++;
 343
 344                         stack_trace = null;
 345
 346                         return this;
 347                 }
 348
 349                 internal void GetFullNameForStackTrace (StringBuilder sb, MethodBase mi)
 350                 {
 351                         ParameterInfo[] p = mi.GetParametersInternal ();
 352                         sb.Append (mi.DeclaringType.ToString ());
 353                         sb.Append (".");
 354                         sb.Append (mi.Name);
 355
 356                         if (mi.IsGenericMethod) {
 357                                 Type[] gen_params = mi.GetGenericArguments ();
 358                                 sb.Append ("[");
 359                                 for (int j = 0; j < gen_params.Length; j++) {
 360                                         if (j > 0)
 361                                                 sb.Append (",");
 362                                         sb.Append (gen_params [j].Name);
 363                                 }
 364                                 sb.Append ("]");
 365                         }
 366
 367                         sb.Append (" (");
 368                         for (int i = 0; i < p.Length; ++i) {
 369                                 if (i > 0)
 370                                         sb.Append (", ");
 371                                 Type pt = p[i].ParameterType;
 372                                 if (pt.IsClass && !String.IsNullOrEmpty (pt.Namespace)) {
 373                                         sb.Append (pt.Namespace);
 374                                         sb.Append (".");
 375                                 }
 376                                 sb.Append (pt.Name);
 377                                 if (p [i].Name != null) {
 378                                         sb.Append (" ");
 379                                         sb.Append (p [i].Name);
 380                                 }
 381                         }
 382                         sb.Append (")");
 383                 }
 384
 385                 // For ExceptionDispatchInfo
 386                 internal void CaptureTrace ()
 387                 {
 388                         if (captured_traces != null) {
 389                                 Array.Resize (ref captured_traces, captured_traces.Length + 1);
 390                         } else {
 391                                 captured_traces = new StackTrace [1];
 392                         }
 393                         captured_traces [captured_traces.Length - 1] = new StackTrace (this, 0, true, true);
 394
 395                         trace_ips = null;
 396                 }
 397
 398                 //
 399                 // The documentation states that this is available in 1.x,
 400                 // but it was not available (MemberRefing this would fail)
 401                 // and it states the signature is `override sealed', but the
 402                 // correct value is `newslot'
 403                 //
 404                 public new Type GetType ()
 405                 {
 406                         return base.GetType ();
 407                 }
 408         }
 409 }