mcs/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         public class CustomAttributeBuilder {
  42                 ConstructorInfo ctor;
  43                 byte[] data;
  44
  45                 internal ConstructorInfo Ctor {
  46                         get {return ctor;}
  47                 }
  48
  49                 internal byte[] Data {
  50                         get {return data;}
  51                 }
  52
  53                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  54                 static extern byte[] GetBlob(Assembly asmb, ConstructorInfo con, object[] constructorArgs, PropertyInfo[] namedProperties, object[] propertyValues, FieldInfo[] namedFields, object[] fieldValues);
  55
  56                 internal CustomAttributeBuilder( ConstructorInfo con, byte[] cdata) {
  57                         ctor = con;
  58                         data = (byte[])cdata.Clone ();
  59                         /* should we check that the user supplied data is correct? */
  60                 }
  61
  62                 public CustomAttributeBuilder( ConstructorInfo con, object[] constructorArgs)
  63                 {
  64                         Initialize (con, constructorArgs, new PropertyInfo [0], new object [0],
  65                                         new FieldInfo [0], new object [0]);
  66                 }
  67                 public CustomAttributeBuilder( ConstructorInfo con, object[] constructorArgs,
  68                                 FieldInfo[] namedFields, object[] fieldValues)
  69                 {
  70                         Initialize (con, constructorArgs, new PropertyInfo [0], new object [0],
  71                                         namedFields, fieldValues);
  72                 }
  73                 public CustomAttributeBuilder( ConstructorInfo con, object[] constructorArgs,
  74                                 PropertyInfo[] namedProperties, object[] propertyValues)
  75                 {
  76                         Initialize (con, constructorArgs, namedProperties, propertyValues, new FieldInfo [0],
  77                                         new object [0]);
  78                 }
  79                 public CustomAttributeBuilder( ConstructorInfo con, object[] constructorArgs,
  80                                 PropertyInfo[] namedProperties, object[] propertyValues,
  81                                 FieldInfo[] namedFields, object[] fieldValues)
  82                 {
  83                         Initialize (con, constructorArgs, namedProperties, propertyValues, namedFields, fieldValues);
  84                 }
  85
  86                 private bool IsValidType (Type t)
  87                 {
  88                         /* FIXME: Add more checks */
  89                         if (t.IsArray && t.GetArrayRank () > 1)
  90                                 return false;
  91                         return true;
  92                 }
  93
  94                 private void Initialize (ConstructorInfo con, object [] constructorArgs,
  95                                 PropertyInfo [] namedProperties, object [] propertyValues,
  96                                 FieldInfo [] namedFields, object [] fieldValues)
  97                 {
  98                         ctor = con;
  99                         if (con == null)
 100                                 throw new ArgumentNullException ("con");
 101                         if (constructorArgs == null)
 102                                 throw new ArgumentNullException ("constructorArgs");
 103                         if (namedProperties == null)
 104                                 throw new ArgumentNullException ("namedProperties");
 105                         if (propertyValues == null)
 106                                 throw new ArgumentNullException ("propertyValues");
 107                         if (namedFields == null)
 108                                 throw new ArgumentNullException ("namedFields");
 109                         if (fieldValues == null)
 110                                 throw new ArgumentNullException ("fieldValues");
 111                         if (con.GetParameterCount () != constructorArgs.Length)
 112                                 throw new ArgumentException ("Parameter count does not match " +
 113                                                 "passed in argument value count.");
 114                         if (namedProperties.Length != propertyValues.Length)
 115                                 throw new ArgumentException ("Array lengths must be the same.",
 116                                                 "namedProperties, propertyValues");
 117                         if (namedFields.Length != fieldValues.Length)
 118                                 throw new ArgumentException ("Array lengths must be the same.",
 119                                                 "namedFields, fieldValues");
 120                         if ((con.Attributes & MethodAttributes.Static) == MethodAttributes.Static ||
 121                                         (con.Attributes & MethodAttributes.Private) == MethodAttributes.Private)
 122                                 throw new ArgumentException ("Cannot have private or static constructor.");
 123
 124                         Type atype = ctor.DeclaringType;
 125                         int i;
 126                         i = 0;
 127                         foreach (FieldInfo fi in namedFields) {
 128                                 Type t = fi.DeclaringType;
 129                                 if (!IsValidType (t))
 130                                         throw new ArgumentException ("Field '" + fi.Name + "' does not have a valid type.");
 131                                 if ((atype != t) && (!t.IsSubclassOf (atype)) && (!atype.IsSubclassOf (t)))
 132                                         throw new ArgumentException ("Field '" + fi.Name + "' does not belong to the same class as the constructor");
 133                                 // FIXME: Check enums and TypeBuilders as well
 134                                 if (fieldValues [i] != null)
 135                                         // IsEnum does not seem to work on TypeBuilders
 136                                         if (!(fi.FieldType is TypeBuilder) && !fi.FieldType.IsEnum && !fi.FieldType.IsInstanceOfType (fieldValues [i])) {
 137                                                 //
 138                                                 // mcs allways uses object[] for array types and
 139                                                 // MS.NET allows this
 140                                                 //
 141                                                 if (!fi.FieldType.IsArray)
 142                                                         throw new ArgumentException ("Value of field '" + fi.Name + "' does not match field type: " + fi.FieldType);
 143                                                 }
 144                                 i ++;
 145                         }
 146
 147                         i = 0;
 148                         foreach (PropertyInfo pi in namedProperties) {
 149                                 if (!pi.CanWrite)
 150                                         throw new ArgumentException ("Property '" + pi.Name + "' does not have a setter.");
 151                                 Type t = pi.DeclaringType;
 152                                 if (!IsValidType (t))
 153                                         throw new ArgumentException ("Property '" + pi.Name + "' does not have a valid type.");
 154                                 if ((atype != t) && (!t.IsSubclassOf (atype)) && (!atype.IsSubclassOf (t)))
 155                                         throw new ArgumentException ("Property '" + pi.Name + "' does not belong to the same class as the constructor");
 156                                 if (propertyValues [i] != null) {
 157                                         if (!(pi.PropertyType is TypeBuilder) && !pi.PropertyType.IsEnum && !pi.PropertyType.IsInstanceOfType (propertyValues [i]))
 158                                                 if (!pi.PropertyType.IsArray)
 159                                                         throw new ArgumentException ("Value of property '" + pi.Name + "' does not match property type: " + pi.PropertyType + " -> " + propertyValues [i]);
 160                                 }
 161                                 i ++;
 162                         }
 163
 164                         i = 0;
 165                         foreach (ParameterInfo pi in con.GetParameters ()) {
 166                                 if (pi != null) {
 167                                         Type paramType = pi.ParameterType;
 168                                         if (!IsValidType (paramType))
 169                                                 throw new ArgumentException ("Argument " + i + " does not have a valid type.");
 170                                         if (constructorArgs [i] != null)
 171                                                 if (!(paramType is TypeBuilder) && !paramType.IsEnum && !paramType.IsInstanceOfType (constructorArgs [i]))
 172                                                         if (!paramType.IsArray)
 173                                                                 throw new ArgumentException ("Value of argument " + i + " does not match parameter type: " + paramType + " -> " + constructorArgs [i]);
 174                                 }
 175                                 i ++;
 176                         }
 177
 178                         data = GetBlob (atype.Assembly, con, constructorArgs, namedProperties, propertyValues, namedFields, fieldValues);
 179                 }
 180
 181                 /* helper methods */
 182                 internal static int decode_len (byte[] data, int pos, out int rpos) {
 183                         int len = 0;
 184                         if ((data [pos] & 0x80) == 0) {
 185                                 len = (int)(data [pos++] & 0x7f);
 186                         } else if ((data [pos] & 0x40) == 0) {
 187                                 len = ((data [pos] & 0x3f) << 8) + data [pos + 1];
 188                                 pos += 2;
 189                         } else {
 190                                 len = ((data [pos] & 0x1f) << 24) + (data [pos + 1] << 16) + (data [pos + 2] << 8) + data [pos + 3];
 191                                 pos += 4;
 192                         }
 193                         rpos = pos;
 194                         return len;
 195                 }
 196
 197                 internal static string string_from_bytes (byte[] data, int pos, int len)
 198                 {
 199                         return System.Text.Encoding.UTF8.GetString(data, pos, len);
 200                 }
 201
 202                 internal string string_arg ()
 203                 {
 204                         int pos = 2;
 205                         int len = decode_len (data, pos, out pos);
 206                         return string_from_bytes (data, pos, len);
 207                 }
 208
 209                 internal static UnmanagedMarshal get_umarshal (CustomAttributeBuilder customBuilder, bool is_field) {
 210                         byte[] data = customBuilder.Data;
 211                         UnmanagedType subtype = (UnmanagedType)0x50; /* NATIVE_MAX */
 212                         int sizeConst = -1;
 213                         int sizeParamIndex = -1;
 214                         bool hasSize = false;
 215                         int value;
 216                         int utype; /* the (stupid) ctor takes a short or an enum ... */
 217                         Type marshalTypeRef = null;
 218                         string marshalCookie = String.Empty;
 219                         utype = (int)data [2];
 220                         utype |= ((int)data [3]) << 8;
 221
 222                         string first_type_name = customBuilder.Ctor.GetParameters()[0].ParameterType.FullName;
 223                         int pos = 6;
 224                         if (first_type_name == "System.Int16")
 225                                 pos = 4;
 226                         int nnamed = (int)data [pos++];
 227                         nnamed |= ((int)data [pos++]) << 8;
 228
 229                         for (int i = 0; i < nnamed; ++i) {
 230                                 int paramType; // What is this ?
 231                                 paramType = (int)data [pos++];
 232                                 paramType |= ((int)data [pos++]) << 8;
 233                                 int len = decode_len (data, pos, out pos);
 234                                 string named_name = string_from_bytes (data, pos, len);
 235                                 pos += len;
 236
 237                                 switch (named_name) {
 238                                 case "ArraySubType":
 239                                         value = (int)data [pos++];
 240                                         value |= ((int)data [pos++]) << 8;
 241                                         value |= ((int)data [pos++]) << 16;
 242                                         value |= ((int)data [pos++]) << 24;
 243                                         subtype = (UnmanagedType)value;
 244                                         break;
 245                                 case "SizeConst":
 246                                         value = (int)data [pos++];
 247                                         value |= ((int)data [pos++]) << 8;
 248                                         value |= ((int)data [pos++]) << 16;
 249                                         value |= ((int)data [pos++]) << 24;
 250                                         sizeConst = value;
 251                                         hasSize = true;
 252                                         break;
 253                                 case "SizeSizeParamIndex":
 254                                         value = (int)data [pos++];
 255                                         value |= ((int)data [pos++]) << 8;
 256                                         sizeParamIndex = value;
 257                                         hasSize = true;
 258                                         break;
 259                                 case "MarshalTypeRef":
 260                                 case "MarshalType":
 261                                         len = decode_len (data, pos, out pos);
 262                                         marshalTypeRef = Type.GetType (string_from_bytes (data, pos, len));
 263                                         pos += len;
 264                                         break;
 265                                 case "MarshalCookie":
 266                                         len = decode_len (data, pos, out pos);
 267                                         marshalCookie = string_from_bytes (data, pos, len);
 268                                         pos += len;
 269                                         break;
 270                                 default:
 271                                         len = decode_len(data, pos, out pos);
 272                                         string_from_bytes (data, pos, len);
 273                                         pos += len;
 274                                         break;
 275                                 }
 276                         }
 277
 278                         switch ((UnmanagedType)utype) {
 279                         case UnmanagedType.LPArray:
 280                                 if (hasSize)
 281                                         return UnmanagedMarshal.DefineLPArrayInternal (subtype, sizeConst, sizeParamIndex);
 282                                 else
 283                                         return UnmanagedMarshal.DefineLPArray (subtype);
 284                         case UnmanagedType.SafeArray:
 285                                 return UnmanagedMarshal.DefineSafeArray (subtype);
 286                         case UnmanagedType.ByValArray:
 287                                 return UnmanagedMarshal.DefineByValArray (sizeConst);
 288                         case UnmanagedType.ByValTStr:
 289                                 return UnmanagedMarshal.DefineByValTStr (sizeConst);
 290                         case UnmanagedType.CustomMarshaler:
 291                                 return UnmanagedMarshal.DefineCustom ( marshalTypeRef, marshalCookie, marshalTypeRef.ToString (), Guid.Empty);
 292                         default:
 293                                 return UnmanagedMarshal.DefineUnmanagedMarshal ((UnmanagedType)utype);
 294                         }
 295                 }
 296
 297                 static object decode_cattr_value (Type t, byte[] data, int pos, out int rpos) {
 298                         switch (Type.GetTypeCode (t)) {
 299                         case TypeCode.String:
 300                                 int len = decode_len (data, pos, out pos);
 301                                 rpos = pos + len;
 302                                 return string_from_bytes (data, pos, len);
 303                         case TypeCode.Int32:
 304                                 rpos = pos + 4;
 305                                 return data [pos] + (data [pos + 1] << 8) + (data [pos + 2] << 16) + (data [pos + 3] << 24);
 306                         case TypeCode.Boolean:
 307                                 rpos = pos + 1;
 308                                 return (data [pos] == 0) ? false : true;
 309                         default:
 310                                 throw new Exception ("FIXME: Type " + t + " not yet handled in decode_cattr_value.");
 311                         }
 312                 }
 313
 314                 internal struct CustomAttributeInfo {
 315                         public ConstructorInfo ctor;
 316                         public object[] ctorArgs;
 317                         public string[] namedParamNames;
 318                         public object[] namedParamValues;
 319                 }
 320
 321                 internal static CustomAttributeInfo decode_cattr (CustomAttributeBuilder customBuilder) {
 322                         byte[] data = customBuilder.Data;
 323                         ConstructorInfo ctor = customBuilder.Ctor;
 324                         int pos = 0;
 325
 326                         CustomAttributeInfo info = new CustomAttributeInfo ();
 327
 328                         // Prolog
 329                         if (data.Length < 2)
 330                                 throw new Exception ();
 331                         if ((data [0] != 0x1) || (data [1] != 0x00))
 332                                 throw new Exception ();
 333                         pos = 2;
 334
 335                         ParameterInfo [] pi = ctor.GetParameters ();
 336                         info.ctor = ctor;
 337                         info.ctorArgs = new object [pi.Length];
 338                         for (int i = 0; i < pi.Length; ++i)
 339                                 info.ctorArgs [i] = decode_cattr_value (pi [i].ParameterType, data, pos, out pos);
 340
 341                         int num_named = data [pos] + (data [pos + 1] * 256);
 342                         pos += 2;
 343
 344                         info.namedParamNames = new string [num_named];
 345                         info.namedParamValues = new object [num_named];
 346                         for (int i = 0; i < num_named; ++i) {
 347                                 int named_type = data [pos++];
 348                                 int data_type = data [pos++];
 349                                 string enum_type_name = null;
 350
 351                                 if (data_type == 0x55) {
 352                                         int len2 = decode_len (data, pos, out pos);
 353                                         enum_type_name = string_from_bytes (data, pos, len2);
 354                                         pos += len2;
 355                                 }
 356
 357                                 int len = decode_len (data, pos, out pos);
 358                                 string name = string_from_bytes (data, pos, len);
 359                                 info.namedParamNames [i] = name;
 360                                 pos += len;
 361
 362                                 if (named_type == 0x53) {
 363                                         /* Field */
 364                                         FieldInfo fi = ctor.DeclaringType.GetField (name, BindingFlags.Public|BindingFlags.NonPublic|BindingFlags.Instance);
 365                                         if (fi == null)
 366                                                 throw new Exception ("Custom attribute type '" + ctor.DeclaringType + "' doesn't contain a field named '" + name + "'");
 367
 368                                         object val = decode_cattr_value (fi.FieldType, data, pos, out pos);
 369                                         if (enum_type_name != null) {
 370                                                 Type enumType = Type.GetType (enum_type_name);
 371                                                 val = Enum.ToObject (enumType, val);
 372                                         }
 373
 374                                         info.namedParamValues [i] = val;
 375                                 }
 376                                 else
 377                                         // FIXME:
 378                                         throw new Exception ();
 379                         }
 380
 381                         return info;
 382                 }
 383         }
 384 }