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         public sealed class DynamicMethod : MethodInfo {
  46                 #region Sync with reflection.h
  47                 private RuntimeMethodHandle mhandle;
  48                 private string name;
  49                 private Type returnType;
  50                 private Type[] parameters;
  51                 private MethodAttributes attributes;
  52                 private CallingConventions callingConvention;
  53                 private Module module;
  54                 private bool skipVisibility;
  55                 private bool init_locals = true;
  56                 private ILGenerator ilgen;
  57                 private int nrefs;
  58                 private object[] refs;
  59                 #endregion
  60                 private Delegate deleg;
  61                 private MonoMethod method;
  62                 private ParameterBuilder[] pinfo;
  63
  64                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m) : this (name, returnType, parameterTypes, m, false) {
  65                 }
  66
  67                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner) : this (name, returnType, parameterTypes, owner, false) {
  68                 }
  69
  70                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, m, skipVisibility) {
  71                 }
  72
  73                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, owner, skipVisibility) {
  74                 }
  75
  76                 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) {
  77                 }
  78
  79                 public DynamicMethod (string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] parameterTypes, Module m, bool skipVisibility) {
  80                         if (name == null)
  81                                 throw new ArgumentNullException ("name");
  82                         if (name == String.Empty)
  83                                 throw new ArgumentException ("Name can't be empty", "name");
  84                         if (returnType == null)
  85                                 throw new ArgumentNullException ("returnType");
  86                         if (m == null)
  87                                 throw new ArgumentNullException ("m");
  88                         if (returnType.IsByRef)
  89                                 throw new ArgumentException ("Return type can't be a byref type", "returnType");
  90                         if (parameterTypes != null) {
  91                                 for (int i = 0; i < parameterTypes.Length; ++i)
  92                                         if (parameterTypes [i] == null)
  93                                                 throw new ArgumentException ("Parameter " + i + " is null", "parameterTypes");
  94                         }
  95
  96                         this.name = name;
  97                         this.attributes = attributes | MethodAttributes.Static;
  98                         this.callingConvention = callingConvention;
  99                         this.returnType = returnType;
 100                         this.parameters = parameterTypes;
 101                         this.module = m;
 102                         this.skipVisibility = skipVisibility;
 103                 }
 104
 105                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 106                 private extern void create_dynamic_method (DynamicMethod m);
 107
 108                 private void CreateDynMethod () {
 109                         if (mhandle.Value == IntPtr.Zero)
 110                                 create_dynamic_method (this);
 111                 }
 112
 113                 public Delegate CreateDelegate (Type delegateType) {
 114                         if (delegateType == null)
 115                                 throw new ArgumentNullException ("delegateType");
 116                         if (deleg != null)
 117                                 return deleg;
 118
 119                         CreateDynMethod ();
 120
 121                         deleg = Delegate.CreateDelegate (delegateType, this);
 122                         return deleg;
 123                 }
 124
 125                 [MonoTODO]
 126                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string strParamName)
 127                 {
 128                         //
 129                         // Extension: Mono allows position == 0 for the return attribute
 130                         //
 131                         if ((position < 0) || (position > parameters.Length))
 132                                 throw new ArgumentOutOfRangeException ("position");
 133
 134                         RejectIfCreated ();
 135
 136                         throw new NotImplementedException ();
 137                 }
 138
 139                 public override MethodInfo GetBaseDefinition () {
 140                         return this;
 141                 }
 142
 143                 [MonoTODO]
 144                 public override object[] GetCustomAttributes (bool inherit) {
 145                         throw new NotImplementedException ();
 146                 }
 147
 148                 [MonoTODO]
 149                 public override object[] GetCustomAttributes (Type attributeType,
 150                                                                                                           bool inherit) {
 151                         throw new NotImplementedException ();
 152                 }
 153
 154                 public ILGenerator GetILGenerator () {
 155                         return GetILGenerator (64);
 156                 }
 157
 158                 public ILGenerator GetILGenerator (int size) {
 159                         if (((GetMethodImplementationFlags () & MethodImplAttributes.CodeTypeMask) !=
 160                                  MethodImplAttributes.IL) ||
 161                                 ((GetMethodImplementationFlags () & MethodImplAttributes.ManagedMask) !=
 162                                  MethodImplAttributes.Managed))
 163                                 throw new InvalidOperationException ("Method body should not exist.");
 164                         if (ilgen != null)
 165                                 return ilgen;
 166                         ilgen = new ILGenerator (Module, new DynamicMethodTokenGenerator (this), size);
 167                         return ilgen;
 168                 }
 169
 170                 public override MethodImplAttributes GetMethodImplementationFlags () {
 171                         return MethodImplAttributes.IL | MethodImplAttributes.Managed;
 172                 }
 173
 174                 public override ParameterInfo[] GetParameters () {
 175                         if (parameters == null)
 176                                 return new ParameterInfo [0];
 177
 178                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 179                         for (int i = 0; i < parameters.Length; i++) {
 180                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 181                         }
 182                         return retval;
 183                 }
 184
 185                 public override object Invoke (object obj, object[] parameters) {
 186                         CreateDynMethod ();
 187                         if (method == null)
 188                                 method = new MonoMethod (mhandle);
 189                         return method.Invoke (obj, parameters);
 190                 }
 191
 192                 public override object Invoke (object obj, BindingFlags invokeAttr,
 193                                                                            Binder binder, object[] parameters,
 194                                                                            CultureInfo culture) {
 195                         CreateDynMethod ();
 196                         if (method == null)
 197                                 method = new MonoMethod (mhandle);
 198                         return method.Invoke (obj, parameters);
 199                 }
 200
 201                 [MonoTODO]
 202                 public override bool IsDefined (Type attributeType, bool inherit) {
 203                         throw new NotImplementedException ();
 204                 }
 205
 206                 public override string ToString () {
 207                         string parms = "";
 208                         ParameterInfo[] p = GetParameters ();
 209                         for (int i = 0; i < p.Length; ++i) {
 210                                 if (i > 0)
 211                                         parms = parms + ", ";
 212                                 parms = parms + p [i].ParameterType.Name;
 213                         }
 214                         return ReturnType.Name+" "+Name+"("+parms+")";
 215                 }
 216
 217                 public override MethodAttributes Attributes {
 218                         get {
 219                                 return attributes;
 220                         }
 221                 }
 222
 223                 public override CallingConventions CallingConvention {
 224                         get {
 225                                 return callingConvention;
 226                         }
 227                 }
 228
 229                 public override Type DeclaringType {
 230                         get {
 231                                 return null;
 232                         }
 233                 }
 234
 235                 public bool InitLocals {
 236                         get {
 237                                 return init_locals;
 238                         }
 239                         set {
 240                                 init_locals = value;
 241                         }
 242                 }
 243
 244                 public override RuntimeMethodHandle MethodHandle {
 245                         get {
 246                                 return mhandle;
 247                         }
 248                 }
 249
 250                 public Module Module {
 251                         get {
 252                                 return module;
 253                         }
 254                 }
 255
 256                 public override string Name {
 257                         get {
 258                                 return name;
 259                         }
 260                 }
 261
 262                 public override Type ReflectedType {
 263                         get {
 264                                 return null;
 265                         }
 266                 }
 267
 268                 [MonoTODO]
 269                 public ParameterInfo ReturnParameter {
 270                         get {
 271                                 throw new NotImplementedException ();
 272                         }
 273                 }
 274
 275                 public override Type ReturnType {
 276                         get {
 277                                 return returnType;
 278                         }
 279                 }
 280
 281                 [MonoTODO]
 282                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 283                         get {
 284                                 throw new NotImplementedException ();
 285                         }
 286                 }
 287
 288                 private void RejectIfCreated () {
 289                         if (mhandle.Value != IntPtr.Zero)
 290                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 291                 }
 292
 293                 private Exception NotSupported () {
 294                         return new NotSupportedException ("The invoked member is not supported on a dynamic method.");
 295                 }
 296
 297                 internal int AddRef (object reference) {
 298                         if (refs == null)
 299                                 refs = new object [4];
 300                         if (nrefs >= refs.Length) {
 301                                 object [] new_refs = new object [refs.Length * 2];
 302                                 System.Array.Copy (refs, new_refs, refs.Length);
 303                                 refs = new_refs;
 304                         }
 305                         refs [nrefs] = reference;
 306                         nrefs ++;
 307                         return nrefs;
 308                 }
 309         }
 310
 311         internal class DynamicMethodTokenGenerator : TokenGenerator {
 312
 313                 private DynamicMethod m;
 314
 315                 public DynamicMethodTokenGenerator (DynamicMethod m) {
 316                         this.m = m;
 317                 }
 318
 319                 public int GetToken (string str) {
 320                         return m.AddRef (str);
 321                 }
 322
 323                 public int GetToken (MethodInfo method, Type[] opt_param_types) {
 324                         throw new InvalidOperationException ();
 325                 }
 326
 327                 public int GetToken (MemberInfo member) {
 328                         return m.AddRef (member);
 329                 }
 330
 331                 public int GetToken (SignatureHelper helper) {
 332                         return m.AddRef (helper);
 333                 }
 334         }
 335 }
 336
 337 #endif