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

   1 //
   2 // System.Reflection.Emit/DynamicMethod.cs
   3 //
   4 // Author:
   5 //   Paolo Molaro (lupus@ximian.com)
   6 //   Zoltan Varga (vargaz@freemail.hu)
   7 //
   8 // (C) 2003 Ximian, Inc.  http://www.ximian.com
   9 //
  10
  11 //
  12 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33
  34 #if NET_2_0 || BOOTSTRAP_NET_2_0
  35
  36 using System;
  37 using System.Reflection;
  38 using System.Reflection.Emit;
  39 using System.Globalization;
  40 using System.Runtime.CompilerServices;
  41 using System.Runtime.InteropServices;
  42
  43 namespace System.Reflection.Emit {
  44
  45 #if NET_2_0
  46         [ComVisible (true)]
  47 #endif
  48         public sealed class DynamicMethod : MethodInfo {
  49                 #region Sync with reflection.h
  50                 private RuntimeMethodHandle mhandle;
  51                 private string name;
  52                 private Type returnType;
  53                 private Type[] parameters;
  54                 private MethodAttributes attributes;
  55                 private CallingConventions callingConvention;
  56                 private Module module;
  57                 private bool skipVisibility;
  58                 private bool init_locals = true;
  59                 private ILGenerator ilgen;
  60                 private int nrefs;
  61                 private object[] refs;
  62                 #endregion
  63                 private Delegate deleg;
  64                 private MonoMethod method;
  65                 private ParameterBuilder[] pinfo;
  66
  67                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m) : this (name, returnType, parameterTypes, m, false) {
  68                 }
  69
  70                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner) : this (name, returnType, parameterTypes, owner, false) {
  71                 }
  72
  73                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, m, skipVisibility) {
  74                 }
  75
  76                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, owner, skipVisibility) {
  77                 }
  78
  79                 public DynamicMethod (string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] parameterTypes, Type owner, bool skipVisibility) : this (name, attributes, callingConvention, returnType, parameterTypes, owner.Module, skipVisibility) {
  80                 }
  81
  82                 public DynamicMethod (string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] parameterTypes, Module m, bool skipVisibility) {
  83                         if (name == null)
  84                                 throw new ArgumentNullException ("name");
  85                         if (name == String.Empty)
  86                                 throw new ArgumentException ("Name can't be empty", "name");
  87                         if (returnType == null)
  88                                 throw new ArgumentNullException ("returnType");
  89                         if (m == null)
  90                                 throw new ArgumentNullException ("m");
  91                         if (returnType.IsByRef)
  92                                 throw new ArgumentException ("Return type can't be a byref type", "returnType");
  93                         if (parameterTypes != null) {
  94                                 for (int i = 0; i < parameterTypes.Length; ++i)
  95                                         if (parameterTypes [i] == null)
  96                                                 throw new ArgumentException ("Parameter " + i + " is null", "parameterTypes");
  97                         }
  98
  99                         this.name = name;
 100                         this.attributes = attributes | MethodAttributes.Static;
 101                         this.callingConvention = callingConvention;
 102                         this.returnType = returnType;
 103                         this.parameters = parameterTypes;
 104                         this.module = m;
 105                         this.skipVisibility = skipVisibility;
 106                 }
 107
 108                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 109                 private extern void create_dynamic_method (DynamicMethod m);
 110
 111                 private void CreateDynMethod () {
 112                         if (mhandle.Value == IntPtr.Zero) {
 113                                 if (ilgen != null)
 114                                         ilgen.label_fixup ();
 115                                 create_dynamic_method (this);
 116                         }
 117                 }
 118
 119                 [ComVisible (true)]
 120                 public Delegate CreateDelegate (Type delegateType)
 121                 {
 122                         if (delegateType == null)
 123                                 throw new ArgumentNullException ("delegateType");
 124                         if (deleg != null)
 125                                 return deleg;
 126
 127                         CreateDynMethod ();
 128
 129                         deleg = Delegate.CreateDelegate (delegateType, this);
 130                         return deleg;
 131                 }
 132
 133                 [ComVisible (true)]
 134                 public Delegate CreateDelegate (Type delegateType, object target)
 135                 {
 136                         if (delegateType == null)
 137                                 throw new ArgumentNullException ("delegateType");
 138
 139                         CreateDynMethod ();
 140
 141                         /* Can't cache the delegate since it is different for each target */
 142                         return Delegate.CreateDelegate (delegateType, target, this);
 143                 }
 144
 145                 [MonoTODO]
 146                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string strParamName)
 147                 {
 148                         //
 149                         // Extension: Mono allows position == 0 for the return attribute
 150                         //
 151                         if ((position < 0) || (position > parameters.Length))
 152                                 throw new ArgumentOutOfRangeException ("position");
 153
 154                         RejectIfCreated ();
 155
 156                         throw new NotImplementedException ();
 157                 }
 158
 159                 public override MethodInfo GetBaseDefinition () {
 160                         return this;
 161                 }
 162
 163                 [MonoTODO]
 164                 public override object[] GetCustomAttributes (bool inherit) {
 165                         throw new NotImplementedException ();
 166                 }
 167
 168                 [MonoTODO]
 169                 public override object[] GetCustomAttributes (Type attributeType,
 170                                                                                                           bool inherit) {
 171                         throw new NotImplementedException ();
 172                 }
 173
 174                 public ILGenerator GetILGenerator () {
 175                         return GetILGenerator (64);
 176                 }
 177
 178                 public ILGenerator GetILGenerator (int size) {
 179                         if (((GetMethodImplementationFlags () & MethodImplAttributes.CodeTypeMask) !=
 180                                  MethodImplAttributes.IL) ||
 181                                 ((GetMethodImplementationFlags () & MethodImplAttributes.ManagedMask) !=
 182                                  MethodImplAttributes.Managed))
 183                                 throw new InvalidOperationException ("Method body should not exist.");
 184                         if (ilgen != null)
 185                                 return ilgen;
 186                         ilgen = new ILGenerator (Module, new DynamicMethodTokenGenerator (this), size);
 187                         return ilgen;
 188                 }
 189
 190                 public override MethodImplAttributes GetMethodImplementationFlags () {
 191                         return MethodImplAttributes.IL | MethodImplAttributes.Managed;
 192                 }
 193
 194                 public override ParameterInfo[] GetParameters () {
 195                         if (parameters == null)
 196                                 return new ParameterInfo [0];
 197
 198                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 199                         for (int i = 0; i < parameters.Length; i++) {
 200                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 201                         }
 202                         return retval;
 203                 }
 204
 205                 public override object Invoke (object obj, object[] parameters) {
 206                         CreateDynMethod ();
 207                         if (method == null)
 208                                 method = new MonoMethod (mhandle);
 209                         return method.Invoke (obj, parameters);
 210                 }
 211
 212                 public override object Invoke (object obj, BindingFlags invokeAttr,
 213                                                                            Binder binder, object[] parameters,
 214                                                                            CultureInfo culture) {
 215                         CreateDynMethod ();
 216                         if (method == null)
 217                                 method = new MonoMethod (mhandle);
 218                         return method.Invoke (obj, parameters);
 219                 }
 220
 221                 [MonoTODO]
 222                 public override bool IsDefined (Type attributeType, bool inherit) {
 223                         throw new NotImplementedException ();
 224                 }
 225
 226                 public override string ToString () {
 227                         string parms = "";
 228                         ParameterInfo[] p = GetParameters ();
 229                         for (int i = 0; i < p.Length; ++i) {
 230                                 if (i > 0)
 231                                         parms = parms + ", ";
 232                                 parms = parms + p [i].ParameterType.Name;
 233                         }
 234                         return ReturnType.Name+" "+Name+"("+parms+")";
 235                 }
 236
 237                 public override MethodAttributes Attributes {
 238                         get {
 239                                 return attributes;
 240                         }
 241                 }
 242
 243                 public override CallingConventions CallingConvention {
 244                         get {
 245                                 return callingConvention;
 246                         }
 247                 }
 248
 249                 public override Type DeclaringType {
 250                         get {
 251                                 return null;
 252                         }
 253                 }
 254
 255                 public bool InitLocals {
 256                         get {
 257                                 return init_locals;
 258                         }
 259                         set {
 260                                 init_locals = value;
 261                         }
 262                 }
 263
 264                 public override RuntimeMethodHandle MethodHandle {
 265                         get {
 266                                 return mhandle;
 267                         }
 268                 }
 269
 270                 public override Module Module {
 271                         get {
 272                                 return module;
 273                         }
 274                 }
 275
 276                 public override string Name {
 277                         get {
 278                                 return name;
 279                         }
 280                 }
 281
 282                 public override Type ReflectedType {
 283                         get {
 284                                 return null;
 285                         }
 286                 }
 287
 288                 [MonoTODO]
 289                 public ParameterInfo ReturnParameter {
 290                         get {
 291                                 throw new NotImplementedException ();
 292                         }
 293                 }
 294
 295                 public override Type ReturnType {
 296                         get {
 297                                 return returnType;
 298                         }
 299                 }
 300
 301                 [MonoTODO]
 302                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 303                         get {
 304                                 throw new NotImplementedException ();
 305                         }
 306                 }
 307
 308                 public override int MetadataToken {
 309                         get {
 310                                 return 0;
 311                         }
 312                 }
 313
 314                 private void RejectIfCreated () {
 315                         if (mhandle.Value != IntPtr.Zero)
 316                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 317                 }
 318
 319                 private Exception NotSupported () {
 320                         return new NotSupportedException ("The invoked member is not supported on a dynamic method.");
 321                 }
 322
 323                 internal int AddRef (object reference) {
 324                         if (refs == null)
 325                                 refs = new object [4];
 326                         if (nrefs >= refs.Length - 1) {
 327                                 object [] new_refs = new object [refs.Length * 2];
 328                                 System.Array.Copy (refs, new_refs, refs.Length);
 329                                 refs = new_refs;
 330                         }
 331                         refs [nrefs] = reference;
 332                         /* Reserved by the runtime */
 333                         refs [nrefs + 1] = null;
 334                         nrefs += 2;
 335                         return nrefs - 1;
 336                 }
 337         }
 338
 339         internal class DynamicMethodTokenGenerator : TokenGenerator {
 340
 341                 private DynamicMethod m;
 342
 343                 public DynamicMethodTokenGenerator (DynamicMethod m) {
 344                         this.m = m;
 345                 }
 346
 347                 public int GetToken (string str) {
 348                         return m.AddRef (str);
 349                 }
 350
 351                 public int GetToken (MethodInfo method, Type[] opt_param_types) {
 352                         throw new InvalidOperationException ();
 353                 }
 354
 355                 public int GetToken (MemberInfo member) {
 356                         return m.AddRef (member);
 357                 }
 358
 359                 public int GetToken (SignatureHelper helper) {
 360                         return m.AddRef (helper);
 361                 }
 362         }
 363 }
 364
 365 #endif