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
  35 using System;
  36 using System.Reflection;
  37 using System.Reflection.Emit;
  38 using System.Globalization;
  39 using System.Runtime.CompilerServices;
  40 using System.Runtime.InteropServices;
  41
  42 namespace System.Reflection.Emit {
  43
  44         [ComVisible (true)]
  45         public sealed class DynamicMethod : MethodInfo {
  46
  47 #pragma warning disable 169, 414
  48                 #region Sync with reflection.h
  49                 private RuntimeMethodHandle mhandle;
  50                 private string name;
  51                 private Type returnType;
  52                 private Type[] parameters;
  53                 private MethodAttributes attributes;
  54                 private CallingConventions callingConvention;
  55                 private Module module;
  56                 private bool skipVisibility;
  57                 private bool init_locals = true;
  58                 private ILGenerator ilgen;
  59                 private int nrefs;
  60                 private object[] refs;
  61                 private IntPtr referenced_by;
  62                 private Type owner;
  63                 #endregion
  64 #pragma warning restore 169, 414
  65
  66                 private Delegate deleg;
  67                 private MonoMethod method;
  68                 private ParameterBuilder[] pinfo;
  69                 internal bool creating;
  70                 private DynamicILInfo il_info;
  71
  72                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m) : this (name, returnType, parameterTypes, m, false) {
  73                 }
  74
  75                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner) : this (name, returnType, parameterTypes, owner, false) {
  76                 }
  77
  78                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, m, skipVisibility) {
  79                 }
  80
  81                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, owner, skipVisibility) {
  82                 }
  83
  84                 public DynamicMethod (string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] parameterTypes, Type owner, bool skipVisibility) : this (name, attributes, callingConvention, returnType, parameterTypes, owner, owner.Module, skipVisibility, false) {
  85                 }
  86
  87                 public DynamicMethod (string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] parameterTypes, Module m, bool skipVisibility) : this (name, attributes, callingConvention, returnType, parameterTypes, null, m, skipVisibility, false) {
  88                 }
  89
  90                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes) : this (name, returnType, parameterTypes, false) {
  91                 }
  92
  93                 [MonoTODO ("Visibility is not restricted")]
  94                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, bool restrictedSkipVisibility)
  95                         : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, null, null, restrictedSkipVisibility, true)
  96                 {
  97                 }
  98
  99                 DynamicMethod (string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type [] parameterTypes, Type owner, Module m, bool skipVisibility, bool anonHosted)
 100                 {
 101                         if (name == null)
 102                                 throw new ArgumentNullException ("name");
 103                         if (returnType == null)
 104                                 returnType = typeof (void);
 105                         if ((m == null) && !anonHosted)
 106                                 throw new ArgumentNullException ("m");
 107                         if (returnType.IsByRef)
 108                                 throw new ArgumentException ("Return type can't be a byref type", "returnType");
 109                         if (parameterTypes != null) {
 110                                 for (int i = 0; i < parameterTypes.Length; ++i)
 111                                         if (parameterTypes [i] == null)
 112                                                 throw new ArgumentException ("Parameter " + i + " is null", "parameterTypes");
 113                         }
 114
 115                         if (m == null)
 116                                 m = AnonHostModuleHolder.anon_host_module;
 117
 118                         this.name = name;
 119                         this.attributes = attributes | MethodAttributes.Static;
 120                         this.callingConvention = callingConvention;
 121                         this.returnType = returnType;
 122                         this.parameters = parameterTypes;
 123                         this.owner = owner;
 124                         this.module = m;
 125                         this.skipVisibility = skipVisibility;
 126                 }
 127
 128                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 129                 private extern void create_dynamic_method (DynamicMethod m);
 130
 131                 private void CreateDynMethod () {
 132                         if (mhandle.Value == IntPtr.Zero) {
 133                                 if (ilgen == null || ilgen.ILOffset == 0)
 134                                         throw new InvalidOperationException ("Method '" + name + "' does not have a method body.");
 135
 136                                 ilgen.label_fixup ();
 137
 138                                 // Have to create all DynamicMethods referenced by this one
 139                                 try {
 140                                         // Used to avoid cycles
 141                                         creating = true;
 142                                         if (refs != null) {
 143                                                 for (int i = 0; i < refs.Length; ++i) {
 144                                                         if (refs [i] is DynamicMethod) {
 145                                                                 DynamicMethod m = (DynamicMethod)refs [i];
 146                                                                 if (!m.creating)
 147                                                                         m.CreateDynMethod ();
 148                                                         }
 149                                                 }
 150                                         }
 151                                 } finally {
 152                                         creating = false;
 153                                 }
 154
 155                                 create_dynamic_method (this);
 156                         }
 157                 }
 158
 159                 [ComVisible (true)]
 160                 public Delegate CreateDelegate (Type delegateType)
 161                 {
 162                         if (delegateType == null)
 163                                 throw new ArgumentNullException ("delegateType");
 164                         if (deleg != null)
 165                                 return deleg;
 166
 167                         CreateDynMethod ();
 168
 169                         deleg = Delegate.CreateDelegate (delegateType, this);
 170                         return deleg;
 171                 }
 172
 173                 [ComVisible (true)]
 174                 public Delegate CreateDelegate (Type delegateType, object target)
 175                 {
 176                         if (delegateType == null)
 177                                 throw new ArgumentNullException ("delegateType");
 178
 179                         CreateDynMethod ();
 180
 181                         /* Can't cache the delegate since it is different for each target */
 182                         return Delegate.CreateDelegate (delegateType, target, this);
 183                 }
 184
 185                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string parameterName)
 186                 {
 187                         //
 188                         // Extension: Mono allows position == 0 for the return attribute
 189                         //
 190                         if ((position < 0) || (position > parameters.Length))
 191                                 throw new ArgumentOutOfRangeException ("position");
 192
 193                         RejectIfCreated ();
 194
 195                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, parameterName);
 196                         if (pinfo == null)
 197                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 198                         pinfo [position] = pb;
 199                         return pb;
 200                 }
 201
 202                 public override MethodInfo GetBaseDefinition () {
 203                         return this;
 204                 }
 205
 206                 [MonoTODO("Not implemented")]
 207                 public override object[] GetCustomAttributes (bool inherit) {
 208                         throw new NotImplementedException ();
 209                 }
 210
 211                 [MonoTODO("Not implemented")]
 212                 public override object[] GetCustomAttributes (Type attributeType,
 213                                                                                                           bool inherit) {
 214                         throw new NotImplementedException ();
 215                 }
 216
 217                 public DynamicILInfo GetDynamicILInfo () {
 218                         if (il_info == null)
 219                                 il_info = new DynamicILInfo (this);
 220                         return il_info;
 221                 }
 222
 223                 public ILGenerator GetILGenerator () {
 224                         return GetILGenerator (64);
 225                 }
 226
 227                 public ILGenerator GetILGenerator (int streamSize) {
 228                         if (((GetMethodImplementationFlags () & MethodImplAttributes.CodeTypeMask) !=
 229                                  MethodImplAttributes.IL) ||
 230                                 ((GetMethodImplementationFlags () & MethodImplAttributes.ManagedMask) !=
 231                                  MethodImplAttributes.Managed))
 232                                 throw new InvalidOperationException ("Method body should not exist.");
 233                         if (ilgen != null)
 234                                 return ilgen;
 235                         ilgen = new ILGenerator (Module, new DynamicMethodTokenGenerator (this), streamSize);
 236                         return ilgen;
 237                 }
 238
 239                 public override MethodImplAttributes GetMethodImplementationFlags () {
 240                         return MethodImplAttributes.IL | MethodImplAttributes.Managed;
 241                 }
 242
 243                 public override ParameterInfo[] GetParameters () {
 244                         if (parameters == null)
 245                                 return new ParameterInfo [0];
 246
 247                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 248                         for (int i = 0; i < parameters.Length; i++) {
 249                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 250                         }
 251                         return retval;
 252                 }
 253
 254                 internal override int GetParameterCount ()
 255                 {
 256                         return parameters == null ? 0 : parameters.Length;
 257                 }
 258
 259                 /*
 260                 public override object Invoke (object obj, object[] parameters) {
 261                         CreateDynMethod ();
 262                         if (method == null)
 263                                 method = new MonoMethod (mhandle);
 264                         return method.Invoke (obj, parameters);
 265                 }
 266                 */
 267
 268                 public override object Invoke (object obj, BindingFlags invokeAttr,
 269                                                                            Binder binder, object[] parameters,
 270                                                                            CultureInfo culture)
 271                 {
 272                         try {
 273                                 CreateDynMethod ();
 274                                 if (method == null)
 275                                         method = new MonoMethod (mhandle);
 276
 277                                 return method.Invoke (obj, parameters);
 278                         }
 279                         catch (MethodAccessException mae) {
 280                                 throw new TargetInvocationException ("Method cannot be invoked.", mae);
 281                         }
 282                 }
 283
 284                 [MonoTODO("Not implemented")]
 285                 public override bool IsDefined (Type attributeType, bool inherit) {
 286                         throw new NotImplementedException ();
 287                 }
 288
 289                 public override string ToString () {
 290                         string parms = String.Empty;
 291                         ParameterInfo[] p = GetParameters ();
 292                         for (int i = 0; i < p.Length; ++i) {
 293                                 if (i > 0)
 294                                         parms = parms + ", ";
 295                                 parms = parms + p [i].ParameterType.Name;
 296                         }
 297                         return ReturnType.Name+" "+Name+"("+parms+")";
 298                 }
 299
 300                 public override MethodAttributes Attributes {
 301                         get {
 302                                 return attributes;
 303                         }
 304                 }
 305
 306                 public override CallingConventions CallingConvention {
 307                         get {
 308                                 return callingConvention;
 309                         }
 310                 }
 311
 312                 public override Type DeclaringType {
 313                         get {
 314                                 return null;
 315                         }
 316                 }
 317
 318                 public bool InitLocals {
 319                         get {
 320                                 return init_locals;
 321                         }
 322                         set {
 323                                 init_locals = value;
 324                         }
 325                 }
 326
 327                 public override RuntimeMethodHandle MethodHandle {
 328                         get {
 329                                 return mhandle;
 330                         }
 331                 }
 332
 333                 public override Module Module {
 334                         get {
 335                                 return module;
 336                         }
 337                 }
 338
 339                 public override string Name {
 340                         get {
 341                                 return name;
 342                         }
 343                 }
 344
 345                 public override Type ReflectedType {
 346                         get {
 347                                 return null;
 348                         }
 349                 }
 350
 351                 [MonoTODO("Not implemented")]
 352                 public override ParameterInfo ReturnParameter {
 353                         get {
 354                                 throw new NotImplementedException ();
 355                         }
 356                 }
 357
 358                 public override Type ReturnType {
 359                         get {
 360                                 return returnType;
 361                         }
 362                 }
 363
 364                 [MonoTODO("Not implemented")]
 365                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 366                         get {
 367                                 throw new NotImplementedException ();
 368                         }
 369                 }
 370
 371 /*
 372                 public override int MetadataToken {
 373                         get {
 374                                 return 0;
 375                         }
 376                 }
 377 */
 378
 379                 private void RejectIfCreated () {
 380                         if (mhandle.Value != IntPtr.Zero)
 381                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 382                 }
 383
 384                 internal int AddRef (object reference) {
 385                         if (refs == null)
 386                                 refs = new object [4];
 387                         if (nrefs >= refs.Length - 1) {
 388                                 object [] new_refs = new object [refs.Length * 2];
 389                                 System.Array.Copy (refs, new_refs, refs.Length);
 390                                 refs = new_refs;
 391                         }
 392                         refs [nrefs] = reference;
 393                         /* Reserved by the runtime */
 394                         refs [nrefs + 1] = null;
 395                         nrefs += 2;
 396                         return nrefs - 1;
 397                 }
 398
 399                 // This class takes care of constructing the module in a thread safe manner
 400                 class AnonHostModuleHolder {
 401                         public static Module anon_host_module;
 402
 403                         static AnonHostModuleHolder () {
 404                                 AssemblyName aname = new AssemblyName ();
 405                                 aname.Name = "Anonymously Hosted DynamicMethods Assembly";
 406                                 AssemblyBuilder ab = AppDomain.CurrentDomain.DefineDynamicAssembly (aname, AssemblyBuilderAccess.Run);
 407
 408                                 anon_host_module = ab.GetManifestModule ();
 409                         }
 410                 }
 411         }
 412
 413         internal class DynamicMethodTokenGenerator : TokenGenerator {
 414
 415                 private DynamicMethod m;
 416
 417                 public DynamicMethodTokenGenerator (DynamicMethod m) {
 418                         this.m = m;
 419                 }
 420
 421                 public int GetToken (string str) {
 422                         return m.AddRef (str);
 423                 }
 424
 425                 public int GetToken (MethodInfo method, Type[] opt_param_types) {
 426                         throw new InvalidOperationException ();
 427                 }
 428
 429                 public int GetToken (MemberInfo member, bool create_open_instance) {
 430                         return m.AddRef (member);
 431                 }
 432
 433                 public int GetToken (SignatureHelper helper) {
 434                         return m.AddRef (helper);
 435                 }
 436         }
 437 }
 438