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         [StructLayout (LayoutKind.Sequential)]
  46         public sealed class DynamicMethod : MethodInfo {
  47
  48 #pragma warning disable 169, 414, 649
  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                 private IntPtr referenced_by;
  63                 private Type owner;
  64                 #endregion
  65 #pragma warning restore 169, 414, 649
  66
  67                 private Delegate deleg;
  68                 private MonoMethod method;
  69                 private ParameterBuilder[] pinfo;
  70                 internal bool creating;
  71                 private DynamicILInfo il_info;
  72
  73                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m) : this (name, returnType, parameterTypes, m, false) {
  74                 }
  75
  76                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner) : this (name, returnType, parameterTypes, owner, false) {
  77                 }
  78
  79                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, m, skipVisibility) {
  80                 }
  81
  82                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, owner, skipVisibility) {
  83                 }
  84
  85                 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) {
  86                 }
  87
  88                 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) {
  89                 }
  90
  91                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes) : this (name, returnType, parameterTypes, false) {
  92                 }
  93
  94                 [MonoTODO ("Visibility is not restricted")]
  95                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, bool restrictedSkipVisibility)
  96                         : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, null, null, restrictedSkipVisibility, true)
  97                 {
  98                 }
  99
 100                 DynamicMethod (string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type [] parameterTypes, Type owner, Module m, bool skipVisibility, bool anonHosted)
 101                 {
 102                         if (name == null)
 103                                 throw new ArgumentNullException ("name");
 104                         if (returnType == null)
 105                                 returnType = typeof (void);
 106                         if ((m == null) && !anonHosted)
 107                                 throw new ArgumentNullException ("m");
 108                         if (returnType.IsByRef)
 109                                 throw new ArgumentException ("Return type can't be a byref type", "returnType");
 110                         if (parameterTypes != null) {
 111                                 for (int i = 0; i < parameterTypes.Length; ++i)
 112                                         if (parameterTypes [i] == null)
 113                                                 throw new ArgumentException ("Parameter " + i + " is null", "parameterTypes");
 114                         }
 115                         if (owner != null && (owner.IsArray || owner.IsInterface)) {
 116                                 throw new ArgumentException ("Owner can't be an array or an interface.");
 117                         }
 118
 119                         if (m == null)
 120                                 m = AnonHostModuleHolder.AnonHostModule;
 121
 122                         this.name = name;
 123                         this.attributes = attributes | MethodAttributes.Static;
 124                         this.callingConvention = callingConvention;
 125                         this.returnType = returnType;
 126                         this.parameters = parameterTypes;
 127                         this.owner = owner;
 128                         this.module = m;
 129                         this.skipVisibility = skipVisibility;
 130                 }
 131
 132                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 133                 private extern void create_dynamic_method (DynamicMethod m);
 134
 135                 private void CreateDynMethod () {
 136                         if (mhandle.Value == IntPtr.Zero) {
 137                                 if (ilgen == null || ilgen.ILOffset == 0)
 138                                         throw new InvalidOperationException ("Method '" + name + "' does not have a method body.");
 139
 140                                 ilgen.label_fixup ();
 141
 142                                 // Have to create all DynamicMethods referenced by this one
 143                                 try {
 144                                         // Used to avoid cycles
 145                                         creating = true;
 146                                         if (refs != null) {
 147                                                 for (int i = 0; i < refs.Length; ++i) {
 148                                                         if (refs [i] is DynamicMethod) {
 149                                                                 DynamicMethod m = (DynamicMethod)refs [i];
 150                                                                 if (!m.creating)
 151                                                                         m.CreateDynMethod ();
 152                                                         }
 153                                                 }
 154                                         }
 155                                 } finally {
 156                                         creating = false;
 157                                 }
 158
 159                                 create_dynamic_method (this);
 160                         }
 161                 }
 162
 163                 [ComVisible (true)]
 164                 public Delegate CreateDelegate (Type delegateType)
 165                 {
 166                         if (delegateType == null)
 167                                 throw new ArgumentNullException ("delegateType");
 168                         if (deleg != null)
 169                                 return deleg;
 170
 171                         CreateDynMethod ();
 172
 173                         deleg = Delegate.CreateDelegate (delegateType, this);
 174                         return deleg;
 175                 }
 176
 177                 [ComVisible (true)]
 178                 public Delegate CreateDelegate (Type delegateType, object target)
 179                 {
 180                         if (delegateType == null)
 181                                 throw new ArgumentNullException ("delegateType");
 182
 183                         CreateDynMethod ();
 184
 185                         /* Can't cache the delegate since it is different for each target */
 186                         return Delegate.CreateDelegate (delegateType, target, this);
 187                 }
 188
 189                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string parameterName)
 190                 {
 191                         //
 192                         // Extension: Mono allows position == 0 for the return attribute
 193                         //
 194                         if ((position < 0) || (position > parameters.Length))
 195                                 throw new ArgumentOutOfRangeException ("position");
 196
 197                         RejectIfCreated ();
 198
 199                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, parameterName);
 200                         if (pinfo == null)
 201                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 202                         pinfo [position] = pb;
 203                         return pb;
 204                 }
 205
 206                 public override MethodInfo GetBaseDefinition () {
 207                         return this;
 208                 }
 209
 210                 [MonoTODO("Not implemented")]
 211                 public override object[] GetCustomAttributes (bool inherit) {
 212                         throw new NotImplementedException ();
 213                 }
 214
 215                 [MonoTODO("Not implemented")]
 216                 public override object[] GetCustomAttributes (Type attributeType,
 217                                                                                                           bool inherit) {
 218                         throw new NotImplementedException ();
 219                 }
 220
 221                 public DynamicILInfo GetDynamicILInfo () {
 222                         if (il_info == null)
 223                                 il_info = new DynamicILInfo (this);
 224                         return il_info;
 225                 }
 226
 227                 public ILGenerator GetILGenerator () {
 228                         return GetILGenerator (64);
 229                 }
 230
 231                 public ILGenerator GetILGenerator (int streamSize) {
 232                         if (((GetMethodImplementationFlags () & MethodImplAttributes.CodeTypeMask) !=
 233                                  MethodImplAttributes.IL) ||
 234                                 ((GetMethodImplementationFlags () & MethodImplAttributes.ManagedMask) !=
 235                                  MethodImplAttributes.Managed))
 236                                 throw new InvalidOperationException ("Method body should not exist.");
 237                         if (ilgen != null)
 238                                 return ilgen;
 239                         ilgen = new ILGenerator (Module, new DynamicMethodTokenGenerator (this), streamSize);
 240                         return ilgen;
 241                 }
 242
 243                 public override MethodImplAttributes GetMethodImplementationFlags () {
 244                         return MethodImplAttributes.IL | MethodImplAttributes.Managed;
 245                 }
 246
 247                 public override ParameterInfo[] GetParameters () {
 248                         if (parameters == null)
 249                                 return new ParameterInfo [0];
 250
 251                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 252                         for (int i = 0; i < parameters.Length; i++) {
 253                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 254                         }
 255                         return retval;
 256                 }
 257
 258                 internal override int GetParameterCount ()
 259                 {
 260                         return parameters == null ? 0 : parameters.Length;
 261                 }
 262
 263                 internal override Type GetParameterType (int pos) {
 264                         return parameters [pos];
 265                 }
 266
 267                 /*
 268                 public override object Invoke (object obj, object[] parameters) {
 269                         CreateDynMethod ();
 270                         if (method == null)
 271                                 method = new MonoMethod (mhandle);
 272                         return method.Invoke (obj, parameters);
 273                 }
 274                 */
 275
 276                 public override object Invoke (object obj, BindingFlags invokeAttr,
 277                                                                            Binder binder, object[] parameters,
 278                                                                            CultureInfo culture)
 279                 {
 280                         try {
 281                                 CreateDynMethod ();
 282                                 if (method == null)
 283                                         method = new MonoMethod (mhandle);
 284
 285                                 return method.Invoke (obj, parameters);
 286                         }
 287                         catch (MethodAccessException mae) {
 288                                 throw new TargetInvocationException ("Method cannot be invoked.", mae);
 289                         }
 290                 }
 291
 292                 [MonoTODO("Not implemented")]
 293                 public override bool IsDefined (Type attributeType, bool inherit) {
 294                         throw new NotImplementedException ();
 295                 }
 296
 297                 public override string ToString () {
 298                         string parms = String.Empty;
 299                         ParameterInfo[] p = GetParameters ();
 300                         for (int i = 0; i < p.Length; ++i) {
 301                                 if (i > 0)
 302                                         parms = parms + ", ";
 303                                 parms = parms + p [i].ParameterType.Name;
 304                         }
 305                         return ReturnType.Name+" "+Name+"("+parms+")";
 306                 }
 307
 308                 public override MethodAttributes Attributes {
 309                         get {
 310                                 return attributes;
 311                         }
 312                 }
 313
 314                 public override CallingConventions CallingConvention {
 315                         get {
 316                                 return callingConvention;
 317                         }
 318                 }
 319
 320                 public override Type DeclaringType {
 321                         get {
 322                                 return null;
 323                         }
 324                 }
 325
 326                 public bool InitLocals {
 327                         get {
 328                                 return init_locals;
 329                         }
 330                         set {
 331                                 init_locals = value;
 332                         }
 333                 }
 334
 335                 public override RuntimeMethodHandle MethodHandle {
 336                         get {
 337                                 return mhandle;
 338                         }
 339                 }
 340
 341                 public override Module Module {
 342                         get {
 343                                 return module;
 344                         }
 345                 }
 346
 347                 public override string Name {
 348                         get {
 349                                 return name;
 350                         }
 351                 }
 352
 353                 public override Type ReflectedType {
 354                         get {
 355                                 return null;
 356                         }
 357                 }
 358
 359                 [MonoTODO("Not implemented")]
 360                 public override ParameterInfo ReturnParameter {
 361                         get {
 362                                 throw new NotImplementedException ();
 363                         }
 364                 }
 365
 366                 public override Type ReturnType {
 367                         get {
 368                                 return returnType;
 369                         }
 370                 }
 371
 372                 [MonoTODO("Not implemented")]
 373                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 374                         get {
 375                                 throw new NotImplementedException ();
 376                         }
 377                 }
 378
 379 /*
 380                 public override int MetadataToken {
 381                         get {
 382                                 return 0;
 383                         }
 384                 }
 385 */
 386
 387                 private void RejectIfCreated () {
 388                         if (mhandle.Value != IntPtr.Zero)
 389                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 390                 }
 391
 392                 internal int AddRef (object reference) {
 393                         if (refs == null)
 394                                 refs = new object [4];
 395                         if (nrefs >= refs.Length - 1) {
 396                                 object [] new_refs = new object [refs.Length * 2];
 397                                 System.Array.Copy (refs, new_refs, refs.Length);
 398                                 refs = new_refs;
 399                         }
 400                         refs [nrefs] = reference;
 401                         /* Reserved by the runtime */
 402                         refs [nrefs + 1] = null;
 403                         nrefs += 2;
 404                         return nrefs - 1;
 405                 }
 406
 407                 // This class takes care of constructing the module in a thread safe manner
 408                 class AnonHostModuleHolder {
 409                         public static Module anon_host_module;
 410
 411                         static AnonHostModuleHolder () {
 412                                 AssemblyName aname = new AssemblyName ();
 413                                 aname.Name = "Anonymously Hosted DynamicMethods Assembly";
 414                                 AssemblyBuilder ab = AppDomain.CurrentDomain.DefineDynamicAssembly (aname, AssemblyBuilderAccess.Run);
 415
 416                                 anon_host_module = ab.GetManifestModule ();
 417                         }
 418
 419                         public static Module AnonHostModule {
 420                                 get {
 421                                         return anon_host_module;
 422                                 }
 423                         }
 424                 }
 425         }
 426
 427         internal class DynamicMethodTokenGenerator : TokenGenerator {
 428
 429                 private DynamicMethod m;
 430
 431                 public DynamicMethodTokenGenerator (DynamicMethod m) {
 432                         this.m = m;
 433                 }
 434
 435                 public int GetToken (string str) {
 436                         return m.AddRef (str);
 437                 }
 438
 439                 public int GetToken (MethodInfo method, Type[] opt_param_types) {
 440                         throw new InvalidOperationException ();
 441                 }
 442
 443                 public int GetToken (MemberInfo member, bool create_open_instance) {
 444                         return m.AddRef (member);
 445                 }
 446
 447                 public int GetToken (SignatureHelper helper) {
 448                         return m.AddRef (helper);
 449                 }
 450         }
 451 }
 452