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                 private IntPtr generic_container;
  65 #if NET_2_0 || BOOTSTRAP_NET_2_0
  66                 private GenericTypeParameterBuilder[] generic_params;
  67 #else
  68                 private Object generic_params; /* so offsets are the same */
  69 #endif
  70                 private Type[] returnModReq;
  71                 private Type[] returnModOpt;
  72                 private Type[][] paramModReq;
  73                 private Type[][] paramModOpt;
  74                 private RefEmitPermissionSet[] permissions;
  75
  76                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] returnModReq, Type[] returnModOpt, Type[] parameterTypes, Type[][] paramModReq, Type[][] paramModOpt) {
  77                         this.name = name;
  78                         this.attrs = attributes;
  79                         this.call_conv = callingConvention;
  80                         this.rtype = returnType;
  81                         this.returnModReq = returnModReq;
  82                         this.returnModOpt = returnModOpt;
  83                         this.paramModReq = paramModReq;
  84                         this.paramModOpt = paramModOpt;
  85                         // The MSDN docs does not specify this, but the MS MethodBuilder
  86                         // appends a HasThis flag if the method is not static
  87                         if ((attributes & MethodAttributes.Static) == 0)
  88                                 this.call_conv |= CallingConventions.HasThis;
  89                         if (parameterTypes != null) {
  90                                 this.parameters = new Type [parameterTypes.Length];
  91                                 System.Array.Copy (parameterTypes, this.parameters, parameterTypes.Length);
  92                         }
  93                         type = tb;
  94                         table_idx = get_next_table_index (this, 0x06, true);
  95                         //Console.WriteLine ("index for "+name+" set to "+table_idx.ToString());
  96                 }
  97
  98                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes,
  99                                                                 CallingConventions callingConvention, Type returnType, Type[] returnModReq, Type[] returnModOpt, Type[] parameterTypes, Type[][] paramModReq, Type[][] paramModOpt,
 100                         String dllName, String entryName, CallingConvention nativeCConv, CharSet nativeCharset)
 101                         : this (tb, name, attributes, callingConvention, returnType, returnModReq, returnModOpt, parameterTypes, paramModReq, paramModOpt) {
 102                         pi_dll = dllName;
 103                         pi_entry = entryName;
 104                         native_cc = nativeCConv;
 105                         ncharset = nativeCharset;
 106                 }
 107
 108                 public bool InitLocals {
 109                         get {return init_locals;}
 110                         set {init_locals = value;}
 111                 }
 112
 113                 internal TypeBuilder TypeBuilder {
 114                         get {return type;}
 115                 }
 116
 117                 public override RuntimeMethodHandle MethodHandle {
 118                         get {
 119                                 throw NotSupported ();
 120                         }
 121                 }
 122
 123                 public override Type ReturnType {get {return rtype;}}
 124                 public override Type ReflectedType {get {return type;}}
 125                 public override Type DeclaringType {get {return type;}}
 126                 public override string Name {get {return name;}}
 127                 public override MethodAttributes Attributes {get {return attrs;}}
 128                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 129                         get {return null;}
 130                 }
 131
 132                 public override CallingConventions CallingConvention {
 133                         get { return call_conv; }
 134                 }
 135
 136                 [MonoTODO]
 137                 public string Signature {
 138                         get {
 139                                 throw new NotImplementedException ();
 140                         }
 141                 }
 142
 143                 public MethodToken GetToken() {
 144                         return new MethodToken(0x06000000 | table_idx);
 145                 }
 146
 147                 public override MethodInfo GetBaseDefinition() {
 148                         return this;
 149                 }
 150                 public override MethodImplAttributes GetMethodImplementationFlags() {
 151                         return iattrs;
 152                 }
 153                 public override ParameterInfo[] GetParameters() {
 154                         if (!type.is_created)
 155                                 throw NotSupported ();
 156                         if (parameters == null)
 157                                 return null;
 158
 159                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 160                         for (int i = 0; i < parameters.Length; i++) {
 161                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 162                         }
 163                         return retval;
 164                 }
 165
 166                 internal override int GetParameterCount ()
 167                 {
 168                         if (parameters == null)
 169                                 return 0;
 170
 171                         return parameters.Length;
 172                 }
 173
 174                 public Module GetModule () {
 175                         return type.Module;
 176                 }
 177
 178                 public void CreateMethodBody( byte[] il, int count) {
 179                         if ((il != null) && ((count < 0) || (count > il.Length)))
 180                                 throw new ArgumentException ("Index was out of range.  Must be non-negative and less than the size of the collection.");
 181
 182                         if ((code != null) || type.is_created)
 183                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 184
 185                         if (il == null)
 186                                 code = null;
 187                         else {
 188                                 code = new byte [count];
 189                                 System.Array.Copy(il, code, count);
 190                         }
 191                 }
 192
 193                 public override Object Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) {
 194                         throw NotSupported ();
 195                 }
 196                 public override bool IsDefined (Type attribute_type, bool inherit) {
 197                         throw NotSupported ();
 198                 }
 199                 public override object[] GetCustomAttributes( bool inherit) {
 200                         throw NotSupported ();
 201                 }
 202                 public override object[] GetCustomAttributes( Type attributeType, bool inherit) {
 203                         throw NotSupported ();
 204                 }
 205                 public ILGenerator GetILGenerator () {
 206                         return GetILGenerator (64);
 207                 }
 208
 209                 public ILGenerator GetILGenerator (int size) {
 210                         if (((iattrs & MethodImplAttributes.CodeTypeMask) !=
 211                                  MethodImplAttributes.IL) ||
 212                                 ((iattrs & MethodImplAttributes.ManagedMask) !=
 213                                  MethodImplAttributes.Managed))
 214                                 throw new InvalidOperationException ("Method body should not exist.");
 215                         if (ilgen != null)
 216                                 return ilgen;
 217                         ilgen = new ILGenerator (type.Module, ((ModuleBuilder)type.Module).GetTokenGenerator (), size);
 218                         return ilgen;
 219                 }
 220
 221                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string strParamName)
 222                 {
 223                         RejectIfCreated ();
 224
 225                         //
 226                         // Extension: Mono allows position == 0 for the return attribute
 227                         //
 228                         if ((position < 0) || (position > parameters.Length))
 229                                 throw new ArgumentOutOfRangeException ("position");
 230
 231                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, strParamName);
 232                         if (pinfo == null)
 233                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 234                         pinfo [position] = pb;
 235                         return pb;
 236                 }
 237
 238                 internal void fixup () {
 239                         if (ilgen != null)
 240                                 ilgen.label_fixup ();
 241                 }
 242
 243                 public void SetCustomAttribute( CustomAttributeBuilder customBuilder) {
 244                         if (customBuilder == null)
 245                                 throw new ArgumentNullException ("customBuilder");
 246                         string attrname = customBuilder.Ctor.ReflectedType.FullName;
 247                         if (attrname == "System.Runtime.CompilerServices.MethodImplAttribute") {
 248                                 byte[] data = customBuilder.Data;
 249                                 int impla; // the (stupid) ctor takes a short or an int ...
 250                                 impla = (int)data [2];
 251                                 impla |= ((int)data [3]) << 8;
 252                                 SetImplementationFlags ((MethodImplAttributes)impla);
 253                                 return;
 254                         }
 255                         if (cattrs != null) {
 256                                 CustomAttributeBuilder[] new_array = new CustomAttributeBuilder [cattrs.Length + 1];
 257                                 cattrs.CopyTo (new_array, 0);
 258                                 new_array [cattrs.Length] = customBuilder;
 259                                 cattrs = new_array;
 260                         } else {
 261                                 cattrs = new CustomAttributeBuilder [1];
 262                                 cattrs [0] = customBuilder;
 263                         }
 264                 }
 265                 public void SetCustomAttribute( ConstructorInfo con, byte[] binaryAttribute) {
 266                         if (con == null)
 267                                 throw new ArgumentNullException ("con");
 268                         if (binaryAttribute == null)
 269                                 throw new ArgumentNullException ("binaryAttribute");
 270                         SetCustomAttribute (new CustomAttributeBuilder (con, binaryAttribute));
 271                 }
 272                 public void SetImplementationFlags( MethodImplAttributes attributes) {
 273                         RejectIfCreated ();
 274                         iattrs = attributes;
 275                 }
 276
 277                 public void AddDeclarativeSecurity( SecurityAction action, PermissionSet pset) {
 278                         if (pset == null)
 279                                 throw new ArgumentNullException ("pset");
 280                         if ((action == SecurityAction.RequestMinimum) ||
 281                                 (action == SecurityAction.RequestOptional) ||
 282                                 (action == SecurityAction.RequestRefuse))
 283                                 throw new ArgumentException ("Request* values are not permitted", "action");
 284
 285                         RejectIfCreated ();
 286
 287                         if (permissions != null) {
 288                                 /* Check duplicate actions */
 289                                 foreach (RefEmitPermissionSet set in permissions)
 290                                         if (set.action == action)
 291                                                 throw new InvalidOperationException ("Multiple permission sets specified with the same SecurityAction.");
 292
 293                                 RefEmitPermissionSet[] new_array = new RefEmitPermissionSet [permissions.Length + 1];
 294                                 permissions.CopyTo (new_array, 0);
 295                                 permissions = new_array;
 296                         }
 297                         else
 298                                 permissions = new RefEmitPermissionSet [1];
 299
 300                         permissions [permissions.Length - 1] = new RefEmitPermissionSet (action, pset.ToXml ().ToString ());
 301                         attrs |= MethodAttributes.HasSecurity;
 302                 }
 303
 304                 [MonoTODO]
 305                 public void SetMarshal (UnmanagedMarshal unmanagedMarshal)
 306                 {
 307                         RejectIfCreated ();
 308                         throw new NotImplementedException ();
 309                 }
 310
 311                 [MonoTODO]
 312                 public void SetSymCustomAttribute (string name, byte[] data)
 313                 {
 314                         RejectIfCreated ();
 315                         throw new NotImplementedException ();
 316                 }
 317
 318                 public override string ToString()
 319                 {
 320                         return "MethodBuilder [" + type.Name + "::" + name + "]";
 321                 }
 322
 323                 [MonoTODO]
 324                 public override bool Equals (object obj)
 325                 {
 326                         return base.Equals (obj);
 327                 }
 328
 329                 public override int GetHashCode ()
 330                 {
 331                         return name.GetHashCode ();
 332                 }
 333
 334                 internal override int get_next_table_index (object obj, int table, bool inc) {
 335                         return type.get_next_table_index (obj, table, inc);
 336                 }
 337
 338                 internal void set_override (MethodInfo mdecl) {
 339                         override_method = mdecl;
 340                 }
 341
 342                 private void RejectIfCreated () {
 343                         if (type.is_created)
 344                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 345                 }
 346
 347                 private Exception NotSupported () {
 348                         return new NotSupportedException ("The invoked member is not supported in a dynamic module.");
 349                 }
 350
 351 #if NET_2_0 || BOOTSTRAP_NET_2_0
 352                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 353                 public override extern MethodInfo BindGenericParameters (Type [] types);
 354
 355                 public override bool Mono_IsInflatedMethod {
 356                         get {
 357                                 return false;
 358                         }
 359                 }
 360
 361                 public override bool HasGenericParameters {
 362                         get {
 363                                 return generic_params != null;
 364                         }
 365                 }
 366
 367                 public override Type[] GetGenericArguments ()
 368                 {
 369                         if (generic_params == null)
 370                                 return new Type [0];
 371
 372                         Type[] result = new Type [generic_params.Length];
 373                         for (int i = 0; i < generic_params.Length; i++)
 374                                 result [i] = generic_params [i];
 375
 376                         return result;
 377                 }
 378
 379                 public GenericTypeParameterBuilder[] DefineGenericParameters (params string[] names)
 380                 {
 381                         generic_params = new GenericTypeParameterBuilder [names.Length];
 382                         for (int i = 0; i < names.Length; i++)
 383                                 generic_params [i] = new GenericTypeParameterBuilder (
 384                                         type, this, names [i], i);
 385
 386                         return generic_params;
 387                 }
 388
 389                 public void SetGenericMethodSignature (MethodAttributes attributes, CallingConventions callingConvention, Type return_type, Type[] parameter_types)
 390                 {
 391                         RejectIfCreated ();
 392
 393                         this.attrs = attributes;
 394                         this.call_conv = callingConvention;
 395                         if ((attributes & MethodAttributes.Static) == 0)
 396                                 this.call_conv |= CallingConventions.HasThis;
 397
 398                         this.rtype = return_type;
 399                         this.parameters = new Type [parameter_types.Length];
 400                         System.Array.Copy (parameter_types, this.parameters, parameter_types.Length);
 401                 }
 402 #endif
 403         }
 404 }
 405