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 (!type.is_created)
 154                                 throw NotSupported ();
 155                         if (parameters == null)
 156                                 return null;
 157
 158                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 159                         for (int i = 0; i < parameters.Length; i++) {
 160                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 161                         }
 162                         return retval;
 163                 }
 164
 165                 internal override int GetParameterCount ()
 166                 {
 167                         if (parameters == null)
 168                                 return 0;
 169
 170                         return parameters.Length;
 171                 }
 172
 173                 public Module GetModule () {
 174                         return type.Module;
 175                 }
 176
 177                 public void CreateMethodBody( byte[] il, int count) {
 178                         if ((il != null) && ((count < 0) || (count > il.Length)))
 179                                 throw new ArgumentException ("Index was out of range.  Must be non-negative and less than the size of the collection.");
 180
 181                         if ((code != null) || type.is_created)
 182                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 183
 184                         if (il == null)
 185                                 code = null;
 186                         else {
 187                                 code = new byte [count];
 188                                 System.Array.Copy(il, code, count);
 189                         }
 190                 }
 191
 192                 public override Object Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) {
 193                         throw NotSupported ();
 194                 }
 195                 public override bool IsDefined (Type attribute_type, bool inherit) {
 196                         throw NotSupported ();
 197                 }
 198                 public override object[] GetCustomAttributes( bool inherit) {
 199                         throw NotSupported ();
 200                 }
 201                 public override object[] GetCustomAttributes( Type attributeType, bool inherit) {
 202                         throw NotSupported ();
 203                 }
 204                 public ILGenerator GetILGenerator () {
 205                         return GetILGenerator (64);
 206                 }
 207
 208                 public ILGenerator GetILGenerator (int size) {
 209                         if (((iattrs & MethodImplAttributes.CodeTypeMask) !=
 210                                  MethodImplAttributes.IL) ||
 211                                 ((iattrs & MethodImplAttributes.ManagedMask) !=
 212                                  MethodImplAttributes.Managed))
 213                                 throw new InvalidOperationException ("Method body should not exist.");
 214                         if (ilgen != null)
 215                                 return ilgen;
 216                         ilgen = new ILGenerator (type.Module, ((ModuleBuilder)type.Module).GetTokenGenerator (), size);
 217                         return ilgen;
 218                 }
 219
 220                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string strParamName)
 221                 {
 222                         RejectIfCreated ();
 223
 224                         //
 225                         // Extension: Mono allows position == 0 for the return attribute
 226                         //
 227                         if ((position < 0) || (position > parameters.Length))
 228                                 throw new ArgumentOutOfRangeException ("position");
 229
 230                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, strParamName);
 231                         if (pinfo == null)
 232                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 233                         pinfo [position] = pb;
 234                         return pb;
 235                 }
 236
 237                 internal void fixup () {
 238                         if (ilgen != null)
 239                                 ilgen.label_fixup ();
 240                 }
 241
 242                 public void SetCustomAttribute( CustomAttributeBuilder customBuilder) {
 243                         if (customBuilder == null)
 244                                 throw new ArgumentNullException ("customBuilder");
 245                         string attrname = customBuilder.Ctor.ReflectedType.FullName;
 246                         if (attrname == "System.Runtime.CompilerServices.MethodImplAttribute") {
 247                                 byte[] data = customBuilder.Data;
 248                                 int impla; // the (stupid) ctor takes a short or an int ...
 249                                 impla = (int)data [2];
 250                                 impla |= ((int)data [3]) << 8;
 251                                 SetImplementationFlags ((MethodImplAttributes)impla);
 252                                 return;
 253                         }
 254                         if (cattrs != null) {
 255                                 CustomAttributeBuilder[] new_array = new CustomAttributeBuilder [cattrs.Length + 1];
 256                                 cattrs.CopyTo (new_array, 0);
 257                                 new_array [cattrs.Length] = customBuilder;
 258                                 cattrs = new_array;
 259                         } else {
 260                                 cattrs = new CustomAttributeBuilder [1];
 261                                 cattrs [0] = customBuilder;
 262                         }
 263                 }
 264                 public void SetCustomAttribute( ConstructorInfo con, byte[] binaryAttribute) {
 265                         if (con == null)
 266                                 throw new ArgumentNullException ("con");
 267                         if (binaryAttribute == null)
 268                                 throw new ArgumentNullException ("binaryAttribute");
 269                         SetCustomAttribute (new CustomAttributeBuilder (con, binaryAttribute));
 270                 }
 271                 public void SetImplementationFlags( MethodImplAttributes attributes) {
 272                         RejectIfCreated ();
 273                         iattrs = attributes;
 274                 }
 275
 276                 public void AddDeclarativeSecurity( SecurityAction action, PermissionSet pset) {
 277                         if (pset == null)
 278                                 throw new ArgumentNullException ("pset");
 279                         if ((action == SecurityAction.RequestMinimum) ||
 280                                 (action == SecurityAction.RequestOptional) ||
 281                                 (action == SecurityAction.RequestRefuse))
 282                                 throw new ArgumentException ("Request* values are not permitted", "action");
 283
 284                         RejectIfCreated ();
 285
 286                         if (permissions != null) {
 287                                 /* Check duplicate actions */
 288                                 foreach (RefEmitPermissionSet set in permissions)
 289                                         if (set.action == action)
 290                                                 throw new InvalidOperationException ("Multiple permission sets specified with the same SecurityAction.");
 291
 292                                 RefEmitPermissionSet[] new_array = new RefEmitPermissionSet [permissions.Length + 1];
 293                                 permissions.CopyTo (new_array, 0);
 294                                 permissions = new_array;
 295                         }
 296                         else
 297                                 permissions = new RefEmitPermissionSet [1];
 298
 299                         permissions [permissions.Length - 1] = new RefEmitPermissionSet (action, pset.ToXml ().ToString ());
 300                         attrs |= MethodAttributes.HasSecurity;
 301                 }
 302
 303                 [MonoTODO]
 304                 public void SetMarshal (UnmanagedMarshal unmanagedMarshal)
 305                 {
 306                         RejectIfCreated ();
 307                         throw new NotImplementedException ();
 308                 }
 309
 310                 [MonoTODO]
 311                 public void SetSymCustomAttribute (string name, byte[] data)
 312                 {
 313                         RejectIfCreated ();
 314                         throw new NotImplementedException ();
 315                 }
 316
 317                 public override string ToString()
 318                 {
 319                         return "MethodBuilder [" + type.Name + "::" + name + "]";
 320                 }
 321
 322                 [MonoTODO]
 323                 public override bool Equals (object obj)
 324                 {
 325                         return base.Equals (obj);
 326                 }
 327
 328                 public override int GetHashCode ()
 329                 {
 330                         return name.GetHashCode ();
 331                 }
 332
 333                 internal override int get_next_table_index (object obj, int table, bool inc) {
 334                         return type.get_next_table_index (obj, table, inc);
 335                 }
 336
 337                 internal void set_override (MethodInfo mdecl) {
 338                         override_method = mdecl;
 339                 }
 340
 341                 private void RejectIfCreated () {
 342                         if (type.is_created)
 343                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 344                 }
 345
 346                 private Exception NotSupported () {
 347                         return new NotSupportedException ("The invoked member is not supported in a dynamic module.");
 348                 }
 349
 350 #if NET_2_0 || BOOTSTRAP_NET_2_0
 351                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 352                 public override extern MethodInfo BindGenericParameters (Type [] types);
 353
 354                 public override bool Mono_IsInflatedMethod {
 355                         get {
 356                                 return false;
 357                         }
 358                 }
 359
 360                 public override bool HasGenericParameters {
 361                         get {
 362                                 return generic_params != null;
 363                         }
 364                 }
 365
 366                 public override Type[] GetGenericArguments ()
 367                 {
 368                         if (generic_params == null)
 369                                 return new Type [0];
 370
 371                         Type[] result = new Type [generic_params.Length];
 372                         for (int i = 0; i < generic_params.Length; i++)
 373                                 result [i] = generic_params [i];
 374
 375                         return result;
 376                 }
 377
 378                 public GenericTypeParameterBuilder[] DefineGenericParameters (string[] names)
 379                 {
 380                         generic_params = new GenericTypeParameterBuilder [names.Length];
 381                         for (int i = 0; i < names.Length; i++)
 382                                 generic_params [i] = new GenericTypeParameterBuilder (
 383                                         type, this, names [i], i);
 384
 385                         return generic_params;
 386                 }
 387
 388                 public void SetGenericMethodSignature (MethodAttributes attributes, CallingConventions callingConvention, Type return_type, Type[] parameter_types)
 389                 {
 390                         RejectIfCreated ();
 391
 392                         this.attrs = attributes;
 393                         this.call_conv = callingConvention;
 394                         if ((attributes & MethodAttributes.Static) == 0)
 395                                 this.call_conv |= CallingConventions.HasThis;
 396
 397                         this.rtype = return_type;
 398                         this.parameters = new Type [parameter_types.Length];
 399                         System.Array.Copy (parameter_types, this.parameters, parameter_types.Length);
 400                 }
 401 #endif
 402         }
 403 }
 404