class/corlib/System.Reflection.Emit/CustomAttributeBuilder.cs

   1
   2 //
   3 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
   4 //
   5 // Permission is hereby granted, free of charge, to any person obtaining
   6 // a copy of this software and associated documentation files (the
   7 // "Software"), to deal in the Software without restriction, including
   8 // without limitation the rights to use, copy, modify, merge, publish,
   9 // distribute, sublicense, and/or sell copies of the Software, and to
  10 // permit persons to whom the Software is furnished to do so, subject to
  11 // the following conditions:
  12 //
  13 // The above copyright notice and this permission notice shall be
  14 // included in all copies or substantial portions of the Software.
  15 //
  16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  17 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  19 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  20 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  21 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  22 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23 //
  24
  25 //
  26 // System.Reflection.Emit/CustomAttributeBuilder.cs
  27 //
  28 // Author:
  29 //   Paolo Molaro (lupus@ximian.com)
  30 //
  31 // (C) 2001 Ximian, Inc.  http://www.ximian.com
  32 //
  33
  34 using System;
  35 using System.Reflection;
  36 using System.Reflection.Emit;
  37 using System.Runtime.CompilerServices;
  38 using System.Runtime.InteropServices;
  39
  40 namespace System.Reflection.Emit {
  41         [ComVisible (true)]
  42         [ComDefaultInterface (typeof (_CustomAttributeBuilder))]
  43         [ClassInterface (ClassInterfaceType.None)]
  44         public class CustomAttributeBuilder : _CustomAttributeBuilder {
  45                 ConstructorInfo ctor;
  46                 byte[] data;
  47
  48                 internal ConstructorInfo Ctor {
  49                         get {return ctor;}
  50                 }
  51
  52                 internal byte[] Data {
  53                         get {return data;}
  54                 }
  55
  56                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  57                 static extern byte[] GetBlob(Assembly asmb, ConstructorInfo con, object[] constructorArgs, PropertyInfo[] namedProperties, object[] propertyValues, FieldInfo[] namedFields, object[] fieldValues);
  58
  59                 internal CustomAttributeBuilder( ConstructorInfo con, byte[] cdata) {
  60                         ctor = con;
  61                         data = (byte[])cdata.Clone ();
  62                         /* should we check that the user supplied data is correct? */
  63                 }
  64
  65                 public CustomAttributeBuilder( ConstructorInfo con, object[] constructorArgs)
  66                 {
  67                         Initialize (con, constructorArgs, new PropertyInfo [0], new object [0],
  68                                         new FieldInfo [0], new object [0]);
  69                 }
  70                 public CustomAttributeBuilder( ConstructorInfo con, object[] constructorArgs,
  71                                 FieldInfo[] namedFields, object[] fieldValues)
  72                 {
  73                         Initialize (con, constructorArgs, new PropertyInfo [0], new object [0],
  74                                         namedFields, fieldValues);
  75                 }
  76                 public CustomAttributeBuilder( ConstructorInfo con, object[] constructorArgs,
  77                                 PropertyInfo[] namedProperties, object[] propertyValues)
  78                 {
  79                         Initialize (con, constructorArgs, namedProperties, propertyValues, new FieldInfo [0],
  80                                         new object [0]);
  81                 }
  82                 public CustomAttributeBuilder( ConstructorInfo con, object[] constructorArgs,
  83                                 PropertyInfo[] namedProperties, object[] propertyValues,
  84                                 FieldInfo[] namedFields, object[] fieldValues)
  85                 {
  86                         Initialize (con, constructorArgs, namedProperties, propertyValues, namedFields, fieldValues);
  87                 }
  88
  89                 private bool IsValidType (Type t)
  90                 {
  91                         /* FIXME: Add more checks */
  92                         if (t.IsArray && t.GetArrayRank () > 1)
  93                                 return false;
  94                         return true;
  95                 }
  96
  97                 private void Initialize (ConstructorInfo con, object [] constructorArgs,
  98                                 PropertyInfo [] namedProperties, object [] propertyValues,
  99                                 FieldInfo [] namedFields, object [] fieldValues)
 100                 {
 101                         ctor = con;
 102                         if (con == null)
 103                                 throw new ArgumentNullException ("con");
 104                         if (constructorArgs == null)
 105                                 throw new ArgumentNullException ("constructorArgs");
 106                         if (namedProperties == null)
 107                                 throw new ArgumentNullException ("namedProperties");
 108                         if (propertyValues == null)
 109                                 throw new ArgumentNullException ("propertyValues");
 110                         if (namedFields == null)
 111                                 throw new ArgumentNullException ("namedFields");
 112                         if (fieldValues == null)
 113                                 throw new ArgumentNullException ("fieldValues");
 114                         if (con.GetParameterCount () != constructorArgs.Length)
 115                                 throw new ArgumentException ("Parameter count does not match " +
 116                                                 "passed in argument value count.");
 117                         if (namedProperties.Length != propertyValues.Length)
 118                                 throw new ArgumentException ("Array lengths must be the same.",
 119                                                 "namedProperties, propertyValues");
 120                         if (namedFields.Length != fieldValues.Length)
 121                                 throw new ArgumentException ("Array lengths must be the same.",
 122                                                 "namedFields, fieldValues");
 123                         if ((con.Attributes & MethodAttributes.Static) == MethodAttributes.Static ||
 124                                         (con.Attributes & MethodAttributes.MemberAccessMask) == MethodAttributes.Private)
 125                                 throw new ArgumentException ("Cannot have private or static constructor.");
 126
 127                         Type atype = ctor.DeclaringType;
 128                         int i;
 129                         i = 0;
 130                         foreach (FieldInfo fi in namedFields) {
 131                                 Type t = fi.DeclaringType;
 132                                 if (!IsValidType (t))
 133                                         throw new ArgumentException ("Field '" + fi.Name + "' does not have a valid type.");
 134                                 if ((atype != t) && (!t.IsSubclassOf (atype)) && (!atype.IsSubclassOf (t)))
 135                                         throw new ArgumentException ("Field '" + fi.Name + "' does not belong to the same class as the constructor");
 136                                 // FIXME: Check enums and TypeBuilders as well
 137                                 if (fieldValues [i] != null)
 138                                         // IsEnum does not seem to work on TypeBuilders
 139                                         if (!(fi.FieldType is TypeBuilder) && !fi.FieldType.IsEnum && !fi.FieldType.IsInstanceOfType (fieldValues [i])) {
 140                                                 //
 141                                                 // mcs allways uses object[] for array types and
 142                                                 // MS.NET allows this
 143                                                 //
 144                                                 if (!fi.FieldType.IsArray)
 145                                                         throw new ArgumentException ("Value of field '" + fi.Name + "' does not match field type: " + fi.FieldType);
 146                                                 }
 147                                 i ++;
 148                         }
 149
 150                         i = 0;
 151                         foreach (PropertyInfo pi in namedProperties) {
 152                                 if (!pi.CanWrite)
 153                                         throw new ArgumentException ("Property '" + pi.Name + "' does not have a setter.");
 154                                 Type t = pi.DeclaringType;
 155                                 if (!IsValidType (t))
 156                                         throw new ArgumentException ("Property '" + pi.Name + "' does not have a valid type.");
 157                                 if ((atype != t) && (!t.IsSubclassOf (atype)) && (!atype.IsSubclassOf (t)))
 158                                         throw new ArgumentException ("Property '" + pi.Name + "' does not belong to the same class as the constructor");
 159                                 if (propertyValues [i] != null) {
 160                                         if (!(pi.PropertyType is TypeBuilder) && !pi.PropertyType.IsEnum && !pi.PropertyType.IsInstanceOfType (propertyValues [i]))
 161                                                 if (!pi.PropertyType.IsArray)
 162                                                         throw new ArgumentException ("Value of property '" + pi.Name + "' does not match property type: " + pi.PropertyType + " -> " + propertyValues [i]);
 163                                 }
 164                                 i ++;
 165                         }
 166
 167                         i = 0;
 168                         foreach (ParameterInfo pi in GetParameters (con)) {
 169                                 if (pi != null) {
 170                                         Type paramType = pi.ParameterType;
 171                                         if (!IsValidType (paramType))
 172                                                 throw new ArgumentException ("Argument " + i + " does not have a valid type.");
 173                                         if (constructorArgs [i] != null)
 174                                                 if (!(paramType is TypeBuilder) && !paramType.IsEnum && !paramType.IsInstanceOfType (constructorArgs [i]))
 175                                                         if (!paramType.IsArray)
 176                                                                 throw new ArgumentException ("Value of argument " + i + " does not match parameter type: " + paramType + " -> " + constructorArgs [i]);
 177                                 }
 178                                 i ++;
 179                         }
 180
 181                         data = GetBlob (atype.Assembly, con, constructorArgs, namedProperties, propertyValues, namedFields, fieldValues);
 182                 }
 183
 184                 /* helper methods */
 185                 internal static int decode_len (byte[] data, int pos, out int rpos) {
 186                         int len = 0;
 187                         if ((data [pos] & 0x80) == 0) {
 188                                 len = (int)(data [pos++] & 0x7f);
 189                         } else if ((data [pos] & 0x40) == 0) {
 190                                 len = ((data [pos] & 0x3f) << 8) + data [pos + 1];
 191                                 pos += 2;
 192                         } else {
 193                                 len = ((data [pos] & 0x1f) << 24) + (data [pos + 1] << 16) + (data [pos + 2] << 8) + data [pos + 3];
 194                                 pos += 4;
 195                         }
 196                         rpos = pos;
 197                         return len;
 198                 }
 199
 200                 internal static string string_from_bytes (byte[] data, int pos, int len)
 201                 {
 202                         return System.Text.Encoding.UTF8.GetString(data, pos, len);
 203                 }
 204
 205                 internal string string_arg ()
 206                 {
 207                         int pos = 2;
 208                         int len = decode_len (data, pos, out pos);
 209                         return string_from_bytes (data, pos, len);
 210                 }
 211
 212                 internal static UnmanagedMarshal get_umarshal (CustomAttributeBuilder customBuilder, bool is_field) {
 213                         byte[] data = customBuilder.Data;
 214                         UnmanagedType subtype = (UnmanagedType)0x50; /* NATIVE_MAX */
 215                         int sizeConst = -1;
 216                         int sizeParamIndex = -1;
 217                         bool hasSize = false;
 218                         int value;
 219                         int utype; /* the (stupid) ctor takes a short or an enum ... */
 220                         string marshalTypeName = null;
 221                         Type marshalTypeRef = null;
 222                         string marshalCookie = String.Empty;
 223                         utype = (int)data [2];
 224                         utype |= ((int)data [3]) << 8;
 225
 226                         string first_type_name = GetParameters (customBuilder.Ctor) [0].ParameterType.FullName;
 227                         int pos = 6;
 228                         if (first_type_name == "System.Int16")
 229                                 pos = 4;
 230                         int nnamed = (int)data [pos++];
 231                         nnamed |= ((int)data [pos++]) << 8;
 232
 233                         for (int i = 0; i < nnamed; ++i) {
 234                                 int paramType; // What is this ?
 235
 236                                 /* Skip field/property signature */
 237                                 pos ++;
 238                                 /* Read type */
 239                                 paramType = ((int)data [pos++]);
 240                                 if (paramType == 0x55) {
 241                                         /* enums, the value is preceeded by the type */
 242                                         int len2 = decode_len (data, pos, out pos);
 243                                         string_from_bytes (data, pos, len2);
 244                                         pos += len2;
 245                                 }
 246                                 int len = decode_len (data, pos, out pos);
 247                                 string named_name = string_from_bytes (data, pos, len);
 248                                 pos += len;
 249
 250                                 switch (named_name) {
 251                                 case "ArraySubType":
 252                                         value = (int)data [pos++];
 253                                         value |= ((int)data [pos++]) << 8;
 254                                         value |= ((int)data [pos++]) << 16;
 255                                         value |= ((int)data [pos++]) << 24;
 256                                         subtype = (UnmanagedType)value;
 257                                         break;
 258                                 case "SizeConst":
 259                                         value = (int)data [pos++];
 260                                         value |= ((int)data [pos++]) << 8;
 261                                         value |= ((int)data [pos++]) << 16;
 262                                         value |= ((int)data [pos++]) << 24;
 263                                         sizeConst = value;
 264                                         hasSize = true;
 265                                         break;
 266                                 case "SafeArraySubType":
 267                                         value = (int)data[pos++];
 268                                         value |= ((int)data[pos++]) << 8;
 269                                         value |= ((int)data[pos++]) << 16;
 270                                         value |= ((int)data[pos++]) << 24;
 271                                         subtype = (UnmanagedType)value;
 272                                         break;
 273                                 case "IidParameterIndex":
 274                                         pos += 4;
 275                                         break;
 276                                 case "SafeArrayUserDefinedSubType":
 277                                         len = decode_len (data, pos, out pos);
 278                                         string_from_bytes (data, pos, len);
 279                                         pos += len;
 280                                         break;
 281                                 case "SizeParamIndex":
 282                                         value = (int)data [pos++];
 283                                         value |= ((int)data [pos++]) << 8;
 284                                         sizeParamIndex = value;
 285                                         hasSize = true;
 286                                         break;
 287                                 case "MarshalType":
 288                                         len = decode_len (data, pos, out pos);
 289                                         marshalTypeName = string_from_bytes (data, pos, len);
 290                                         pos += len;
 291                                         break;
 292                                 case "MarshalTypeRef":
 293                                         len = decode_len (data, pos, out pos);
 294                                         marshalTypeName = string_from_bytes (data, pos, len);
 295                                         marshalTypeRef = Type.GetType (marshalTypeName);
 296                                         pos += len;
 297                                         break;
 298                                 case "MarshalCookie":
 299                                         len = decode_len (data, pos, out pos);
 300                                         marshalCookie = string_from_bytes (data, pos, len);
 301                                         pos += len;
 302                                         break;
 303                                 default:
 304                                         throw new Exception ("Unknown MarshalAsAttribute field: " + named_name);
 305                                 }
 306                         }
 307
 308                         switch ((UnmanagedType)utype) {
 309                         case UnmanagedType.LPArray:
 310                                 if (hasSize)
 311                                         return UnmanagedMarshal.DefineLPArrayInternal (subtype, sizeConst, sizeParamIndex);
 312                                 else
 313                                         return UnmanagedMarshal.DefineLPArray (subtype);
 314                         case UnmanagedType.SafeArray:
 315                                 return UnmanagedMarshal.DefineSafeArray (subtype);
 316                         case UnmanagedType.ByValArray:
 317                                 if (!is_field)
 318                                         throw new ArgumentException ("Specified unmanaged type is only valid on fields");
 319
 320                                 return UnmanagedMarshal.DefineByValArray (sizeConst);
 321                         case UnmanagedType.ByValTStr:
 322                                 return UnmanagedMarshal.DefineByValTStr (sizeConst);
 323                         case UnmanagedType.CustomMarshaler:
 324                                 return UnmanagedMarshal.DefineCustom (marshalTypeRef, marshalCookie, marshalTypeName, Guid.Empty);
 325                         default:
 326                                 return UnmanagedMarshal.DefineUnmanagedMarshal ((UnmanagedType)utype);
 327                         }
 328                 }
 329
 330                 static Type elementTypeToType (int elementType) {
 331                         /* Partition II, section 23.1.16 */
 332                         switch (elementType) {
 333                         case 0x02:
 334                                 return typeof (bool);
 335                         case 0x03:
 336                                 return typeof (char);
 337                         case 0x04:
 338                                 return typeof (sbyte);
 339                         case 0x05:
 340                                 return typeof (byte);
 341                         case 0x06:
 342                                 return typeof (short);
 343                         case 0x07:
 344                                 return typeof (ushort);
 345                         case 0x08:
 346                                 return typeof (int);
 347                         case 0x09:
 348                                 return typeof (uint);
 349                         case 0x0a:
 350                                 return typeof (long);
 351                         case 0x0b:
 352                                 return typeof (ulong);
 353                         case 0x0c:
 354                                 return typeof (float);
 355                         case 0x0d:
 356                                 return typeof (double);
 357                         case 0x0e:
 358                                 return typeof (string);
 359                         default:
 360                                 throw new Exception ("Unknown element type '" + elementType + "'");
 361                         }
 362                 }
 363
 364                 static object decode_cattr_value (Type t, byte[] data, int pos, out int rpos) {
 365                         switch (Type.GetTypeCode (t)) {
 366                         case TypeCode.String:
 367                                 if (data [pos] == 0xff) {
 368                                         rpos = pos + 1;
 369                                         return null;
 370                                 }
 371                                 int len = decode_len (data, pos, out pos);
 372                                 rpos = pos + len;
 373                                 return string_from_bytes (data, pos, len);
 374                         case TypeCode.Int32:
 375                                 rpos = pos + 4;
 376                                 return data [pos] + (data [pos + 1] << 8) + (data [pos + 2] << 16) + (data [pos + 3] << 24);
 377                         case TypeCode.Boolean:
 378                                 rpos = pos + 1;
 379                                 return (data [pos] == 0) ? false : true;
 380                         case TypeCode.Object:
 381                                 int subtype = data [pos];
 382                                 pos += 1;
 383
 384                                 if (subtype >= 0x02 && subtype <= 0x0e)
 385                                         return decode_cattr_value (elementTypeToType (subtype), data, pos, out rpos);
 386                                 else
 387                                         throw new Exception ("Subtype '" + subtype + "' of type object not yet handled in decode_cattr_value");
 388                         default:
 389                                 throw new Exception ("FIXME: Type " + t + " not yet handled in decode_cattr_value.");
 390                         }
 391                 }
 392
 393                 internal struct CustomAttributeInfo {
 394                         public ConstructorInfo ctor;
 395                         public object[] ctorArgs;
 396                         public string[] namedParamNames;
 397                         public object[] namedParamValues;
 398                 }
 399
 400                 internal static CustomAttributeInfo decode_cattr (CustomAttributeBuilder customBuilder) {
 401                         byte[] data = customBuilder.Data;
 402                         ConstructorInfo ctor = customBuilder.Ctor;
 403                         int pos = 0;
 404
 405                         CustomAttributeInfo info = new CustomAttributeInfo ();
 406
 407                         // Prolog
 408                         if (data.Length < 2)
 409                                 throw new Exception ("Custom attr length is only '" + data.Length + "'");
 410                         if ((data [0] != 0x1) || (data [1] != 0x00))
 411                                 throw new Exception ("Prolog invalid");
 412                         pos = 2;
 413
 414                         ParameterInfo [] pi = GetParameters (ctor);
 415                         info.ctor = ctor;
 416                         info.ctorArgs = new object [pi.Length];
 417                         for (int i = 0; i < pi.Length; ++i)
 418                                 info.ctorArgs [i] = decode_cattr_value (pi [i].ParameterType, data, pos, out pos);
 419
 420                         int num_named = data [pos] + (data [pos + 1] * 256);
 421                         pos += 2;
 422
 423                         info.namedParamNames = new string [num_named];
 424                         info.namedParamValues = new object [num_named];
 425                         for (int i = 0; i < num_named; ++i) {
 426                                 int named_type = data [pos++];
 427                                 int data_type = data [pos++];
 428                                 string enum_type_name = null;
 429
 430                                 if (data_type == 0x55) {
 431                                         int len2 = decode_len (data, pos, out pos);
 432                                         enum_type_name = string_from_bytes (data, pos, len2);
 433                                         pos += len2;
 434                                 }
 435
 436                                 int len = decode_len (data, pos, out pos);
 437                                 string name = string_from_bytes (data, pos, len);
 438                                 info.namedParamNames [i] = name;
 439                                 pos += len;
 440
 441                                 if (named_type == 0x53) {
 442                                         /* Field */
 443                                         FieldInfo fi = ctor.DeclaringType.GetField (name, BindingFlags.Public|BindingFlags.NonPublic|BindingFlags.Instance);
 444                                         if (fi == null)
 445                                                 throw new Exception ("Custom attribute type '" + ctor.DeclaringType + "' doesn't contain a field named '" + name + "'");
 446
 447                                         object val = decode_cattr_value (fi.FieldType, data, pos, out pos);
 448                                         if (enum_type_name != null) {
 449                                                 Type enumType = Type.GetType (enum_type_name);
 450                                                 val = Enum.ToObject (enumType, val);
 451                                         }
 452
 453                                         info.namedParamValues [i] = val;
 454                                 }
 455                                 else
 456                                         // FIXME:
 457                                         throw new Exception ("Unknown named type: " + named_type);
 458                         }
 459
 460                         return info;
 461                 }
 462
 463                 void _CustomAttributeBuilder.GetIDsOfNames ([In] ref Guid riid, IntPtr rgszNames, uint cNames, uint lcid, IntPtr rgDispId)
 464                 {
 465                         throw new NotImplementedException ();
 466                 }
 467
 468                 void _CustomAttributeBuilder.GetTypeInfo (uint iTInfo, uint lcid, IntPtr ppTInfo)
 469                 {
 470                         throw new NotImplementedException ();
 471                 }
 472
 473                 void _CustomAttributeBuilder.GetTypeInfoCount (out uint pcTInfo)
 474                 {
 475                         throw new NotImplementedException ();
 476                 }
 477
 478                 void _CustomAttributeBuilder.Invoke (uint dispIdMember, [In] ref Guid riid, uint lcid, short wFlags, IntPtr pDispParams, IntPtr pVarResult, IntPtr pExcepInfo, IntPtr puArgErr)
 479                 {
 480                         throw new NotImplementedException ();
 481                 }
 482
 483                 static ParameterInfo [] GetParameters (ConstructorInfo ctor)
 484                 {
 485                         ConstructorBuilder cb = ctor as ConstructorBuilder;
 486                         if (cb != null)
 487                                 return cb.GetParametersInternal ();
 488                         return ctor.GetParameters ();
 489                 }
 490         }
 491 }