mcs/class/corlib/System.Reflection.Emit/MethodBuilder.cs

   1 //
   2 // System.Reflection.Emit/MethodBuilder.cs
   3 //
   4 // Author:
   5 //   Paolo Molaro (lupus@ximian.com)
   6 //
   7 // (C) 2001 Ximian, Inc.  http://www.ximian.com
   8 //
   9
  10 //
  11 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System;
  34 using System.Reflection;
  35 using System.Reflection.Emit;
  36 using System.Globalization;
  37 using System.Security;
  38 using System.Security.Permissions;
  39 using System.Runtime.CompilerServices;
  40 using System.Runtime.InteropServices;
  41
  42 namespace System.Reflection.Emit {
  43
  44         public sealed class MethodBuilder : MethodInfo {
  45                 private RuntimeMethodHandle mhandle;
  46                 private Type rtype;
  47                 private Type[] parameters;
  48                 private MethodAttributes attrs;
  49                 private MethodImplAttributes iattrs;
  50                 private string name;
  51                 private int table_idx;
  52                 private byte[] code;
  53                 private ILGenerator ilgen;
  54                 private TypeBuilder type;
  55                 private ParameterBuilder[] pinfo;
  56                 private CustomAttributeBuilder[] cattrs;
  57                 private MethodInfo override_method;
  58                 private string pi_dll;
  59                 private string pi_entry;
  60                 private CharSet ncharset;
  61                 private CallingConvention native_cc;
  62                 private CallingConventions call_conv;
  63                 private bool init_locals = true;
  64 #if NET_2_0 || BOOTSTRAP_NET_2_0
  65                 private GenericTypeParameterBuilder[] generic_params;
  66 #else
  67                 private Object generic_params; /* so offsets are the same */
  68 #endif
  69                 private Type[] returnModReq;
  70                 private Type[] returnModOpt;
  71                 private Type[][] paramModReq;
  72                 private Type[][] paramModOpt;
  73                 private RefEmitPermissionSet[] permissions;
  74
  75                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] returnModReq, Type[] returnModOpt, Type[] parameterTypes, Type[][] paramModReq, Type[][] paramModOpt) {
  76                         this.name = name;
  77                         this.attrs = attributes;
  78                         this.call_conv = callingConvention;
  79                         this.rtype = returnType;
  80                         this.returnModReq = returnModReq;
  81                         this.returnModOpt = returnModOpt;
  82                         this.paramModReq = paramModReq;
  83                         this.paramModOpt = paramModOpt;
  84                         // The MSDN docs does not specify this, but the MS MethodBuilder
  85                         // appends a HasThis flag if the method is not static
  86                         if ((attributes & MethodAttributes.Static) == 0)
  87                                 this.call_conv |= CallingConventions.HasThis;
  88                         if (parameterTypes != null) {
  89                                 this.parameters = new Type [parameterTypes.Length];
  90                                 System.Array.Copy (parameterTypes, this.parameters, parameterTypes.Length);
  91                         }
  92                         type = tb;
  93                         table_idx = get_next_table_index (this, 0x06, true);
  94                         //Console.WriteLine ("index for "+name+" set to "+table_idx.ToString());
  95                 }
  96
  97                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes,
  98                                                                 CallingConventions callingConvention, Type returnType, Type[] returnModReq, Type[] returnModOpt, Type[] parameterTypes, Type[][] paramModReq, Type[][] paramModOpt,
  99                         String dllName, String entryName, CallingConvention nativeCConv, CharSet nativeCharset)
 100                         : this (tb, name, attributes, callingConvention, returnType, returnModReq, returnModOpt, parameterTypes, paramModReq, paramModOpt) {
 101                         pi_dll = dllName;
 102                         pi_entry = entryName;
 103                         native_cc = nativeCConv;
 104                         ncharset = nativeCharset;
 105                 }
 106
 107                 public bool InitLocals {
 108                         get {return init_locals;}
 109                         set {init_locals = value;}
 110                 }
 111
 112                 internal TypeBuilder TypeBuilder {
 113                         get {return type;}
 114                 }
 115
 116                 public override RuntimeMethodHandle MethodHandle {
 117                         get {
 118                                 throw NotSupported ();
 119                         }
 120                 }
 121
 122                 public override Type ReturnType {get {return rtype;}}
 123                 public override Type ReflectedType {get {return type;}}
 124                 public override Type DeclaringType {get {return type;}}
 125                 public override string Name {get {return name;}}
 126                 public override MethodAttributes Attributes {get {return attrs;}}
 127                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 128                         get {return null;}
 129                 }
 130
 131                 public override CallingConventions CallingConvention {
 132                         get { return call_conv; }
 133                 }
 134
 135                 [MonoTODO]
 136                 public string Signature {
 137                         get {
 138                                 throw new NotImplementedException ();
 139                         }
 140                 }
 141
 142                 public MethodToken GetToken() {
 143                         return new MethodToken(0x06000000 | table_idx);
 144                 }
 145
 146                 public override MethodInfo GetBaseDefinition() {
 147                         return this;
 148                 }
 149                 public override MethodImplAttributes GetMethodImplementationFlags() {
 150                         return iattrs;
 151                 }
 152                 public override ParameterInfo[] GetParameters() {
 153                         if (parameters == null)
 154                                 return null;
 155
 156                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 157                         for (int i = 0; i < parameters.Length; i++) {
 158                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 159                         }
 160                         return retval;
 161                 }
 162
 163                 internal override int GetParameterCount ()
 164                 {
 165                         if (parameters == null)
 166                                 return 0;
 167
 168                         return parameters.Length;
 169                 }
 170
 171                 public Module GetModule () {
 172                         return type.Module;
 173                 }
 174
 175                 public void CreateMethodBody( byte[] il, int count) {
 176                         if ((il != null) && ((count < 0) || (count > il.Length)))
 177                                 throw new ArgumentException ("Index was out of range.  Must be non-negative and less than the size of the collection.");
 178
 179                         if ((code != null) || type.is_created)
 180                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 181
 182                         if (il == null)
 183                                 code = null;
 184                         else {
 185                                 code = new byte [count];
 186                                 System.Array.Copy(il, code, count);
 187                         }
 188                 }
 189
 190                 public override Object Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) {
 191                         throw NotSupported ();
 192                 }
 193                 public override bool IsDefined (Type attribute_type, bool inherit) {
 194                         throw NotSupported ();
 195                 }
 196                 public override object[] GetCustomAttributes( bool inherit) {
 197                         throw NotSupported ();
 198                 }
 199                 public override object[] GetCustomAttributes( Type attributeType, bool inherit) {
 200                         throw NotSupported ();
 201                 }
 202                 public ILGenerator GetILGenerator () {
 203                         return GetILGenerator (64);
 204                 }
 205
 206                 public ILGenerator GetILGenerator (int size) {
 207                         if (((iattrs & MethodImplAttributes.CodeTypeMask) !=
 208                                  MethodImplAttributes.IL) ||
 209                                 ((iattrs & MethodImplAttributes.ManagedMask) !=
 210                                  MethodImplAttributes.Managed))
 211                                 throw new InvalidOperationException ("Method body should not exist.");
 212                         if (ilgen != null)
 213                                 return ilgen;
 214                         ilgen = new ILGenerator (type.Module, ((ModuleBuilder)type.Module).GetTokenGenerator (), size);
 215                         return ilgen;
 216                 }
 217
 218                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string strParamName)
 219                 {
 220                         RejectIfCreated ();
 221
 222                         //
 223                         // Extension: Mono allows position == 0 for the return attribute
 224                         //
 225                         if ((position < 0) || (position > parameters.Length))
 226                                 throw new ArgumentOutOfRangeException ("position");
 227
 228                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, strParamName);
 229                         if (pinfo == null)
 230                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 231                         pinfo [position] = pb;
 232                         return pb;
 233                 }
 234
 235                 internal void fixup () {
 236                         if (ilgen != null)
 237                                 ilgen.label_fixup ();
 238                 }
 239
 240                 public void SetCustomAttribute( CustomAttributeBuilder customBuilder) {
 241                         if (customBuilder == null)
 242                                 throw new ArgumentNullException ("customBuilder");
 243                         string attrname = customBuilder.Ctor.ReflectedType.FullName;
 244                         if (attrname == "System.Runtime.CompilerServices.MethodImplAttribute") {
 245                                 byte[] data = customBuilder.Data;
 246                                 int impla; // the (stupid) ctor takes a short or an int ...
 247                                 impla = (int)data [2];
 248                                 impla |= ((int)data [3]) << 8;
 249                                 SetImplementationFlags ((MethodImplAttributes)impla);
 250                                 return;
 251                         }
 252                         if (cattrs != null) {
 253                                 CustomAttributeBuilder[] new_array = new CustomAttributeBuilder [cattrs.Length + 1];
 254                                 cattrs.CopyTo (new_array, 0);
 255                                 new_array [cattrs.Length] = customBuilder;
 256                                 cattrs = new_array;
 257                         } else {
 258                                 cattrs = new CustomAttributeBuilder [1];
 259                                 cattrs [0] = customBuilder;
 260                         }
 261                 }
 262                 public void SetCustomAttribute( ConstructorInfo con, byte[] binaryAttribute) {
 263                         if (con == null)
 264                                 throw new ArgumentNullException ("con");
 265                         if (binaryAttribute == null)
 266                                 throw new ArgumentNullException ("binaryAttribute");
 267                         SetCustomAttribute (new CustomAttributeBuilder (con, binaryAttribute));
 268                 }
 269                 public void SetImplementationFlags( MethodImplAttributes attributes) {
 270                         RejectIfCreated ();
 271                         iattrs = attributes;
 272                 }
 273
 274                 public void AddDeclarativeSecurity( SecurityAction action, PermissionSet pset) {
 275                         if (pset == null)
 276                                 throw new ArgumentNullException ("pset");
 277                         if ((action == SecurityAction.RequestMinimum) ||
 278                                 (action == SecurityAction.RequestOptional) ||
 279                                 (action == SecurityAction.RequestRefuse))
 280                                 throw new ArgumentException ("Request* values are not permitted", "action");
 281
 282                         RejectIfCreated ();
 283
 284                         if (permissions != null) {
 285                                 /* Check duplicate actions */
 286                                 foreach (RefEmitPermissionSet set in permissions)
 287                                         if (set.action == action)
 288                                                 throw new InvalidOperationException ("Multiple permission sets specified with the same SecurityAction.");
 289
 290                                 RefEmitPermissionSet[] new_array = new RefEmitPermissionSet [permissions.Length + 1];
 291                                 permissions.CopyTo (new_array, 0);
 292                                 permissions = new_array;
 293                         }
 294                         else
 295                                 permissions = new RefEmitPermissionSet [1];
 296
 297                         permissions [permissions.Length - 1] = new RefEmitPermissionSet (action, pset.ToXml ().ToString ());
 298                         attrs |= MethodAttributes.HasSecurity;
 299                 }
 300
 301                 [MonoTODO]
 302                 public void SetMarshal (UnmanagedMarshal unmanagedMarshal)
 303                 {
 304                         RejectIfCreated ();
 305                         throw new NotImplementedException ();
 306                 }
 307
 308                 [MonoTODO]
 309                 public void SetSymCustomAttribute (string name, byte[] data)
 310                 {
 311                         RejectIfCreated ();
 312                         throw new NotImplementedException ();
 313                 }
 314
 315                 public override string ToString()
 316                 {
 317                         return "MethodBuilder [" + type.Name + "::" + name + "]";
 318                 }
 319
 320                 [MonoTODO]
 321                 public override bool Equals (object obj)
 322                 {
 323                         return base.Equals (obj);
 324                 }
 325
 326                 public override int GetHashCode ()
 327                 {
 328                         return name.GetHashCode ();
 329                 }
 330
 331                 internal override int get_next_table_index (object obj, int table, bool inc) {
 332                         return type.get_next_table_index (obj, table, inc);
 333                 }
 334
 335                 internal void set_override (MethodInfo mdecl) {
 336                         override_method = mdecl;
 337                 }
 338
 339                 private void RejectIfCreated () {
 340                         if (type.is_created)
 341                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 342                 }
 343
 344                 private Exception NotSupported () {
 345                         return new NotSupportedException ("The invoked member is not supported in a dynamic module.");
 346                 }
 347
 348 #if NET_2_0 || BOOTSTRAP_NET_2_0
 349                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 350                 public override extern MethodInfo BindGenericParameters (Type [] types);
 351
 352                 public override bool Mono_IsInflatedMethod {
 353                         get {
 354                                 return false;
 355                         }
 356                 }
 357
 358                 public override bool HasGenericParameters {
 359                         get {
 360                                 return generic_params != null;
 361                         }
 362                 }
 363
 364                 public override Type[] GetGenericArguments ()
 365                 {
 366                         if (generic_params == null)
 367                                 return new Type [0];
 368
 369                         Type[] result = new Type [generic_params.Length];
 370                         for (int i = 0; i < generic_params.Length; i++)
 371                                 result [i] = generic_params [i];
 372
 373                         return result;
 374                 }
 375
 376                 public GenericTypeParameterBuilder[] DefineGenericParameters (string[] names)
 377                 {
 378                         generic_params = new GenericTypeParameterBuilder [names.Length];
 379                         for (int i = 0; i < names.Length; i++)
 380                                 generic_params [i] = new GenericTypeParameterBuilder (
 381                                         type, this, names [i], i);
 382
 383                         return generic_params;
 384                 }
 385
 386                 public void SetGenericMethodSignature (MethodAttributes attributes, CallingConventions callingConvention, Type return_type, Type[] parameter_types)
 387                 {
 388                         RejectIfCreated ();
 389
 390                         this.attrs = attributes;
 391                         this.call_conv = callingConvention;
 392                         if ((attributes & MethodAttributes.Static) == 0)
 393                                 this.call_conv |= CallingConventions.HasThis;
 394
 395                         this.rtype = return_type;
 396                         this.parameters = new Type [parameter_types.Length];
 397                         System.Array.Copy (parameter_types, this.parameters, parameter_types.Length);
 398                 }
 399 #endif
 400         }
 401 }
 402