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

   1
   2 //
   3 // System.Reflection.Emit/MethodBuilder.cs
   4 //
   5 // Author:
   6 //   Paolo Molaro (lupus@ximian.com)
   7 //
   8 // (C) 2001 Ximian, Inc.  http://www.ximian.com
   9 //
  10
  11 using System;
  12 using System.Reflection;
  13 using System.Reflection.Emit;
  14 using System.Globalization;
  15 using System.Security;
  16 using System.Security.Permissions;
  17 using System.Runtime.CompilerServices;
  18 using System.Runtime.InteropServices;
  19
  20 namespace System.Reflection.Emit {
  21
  22         public sealed class MethodBuilder : MethodInfo {
  23                 private RuntimeMethodHandle mhandle;
  24                 private Type rtype;
  25                 private Type[] parameters;
  26                 private MethodAttributes attrs;
  27                 private MethodImplAttributes iattrs;
  28                 private string name;
  29                 private int table_idx;
  30                 private byte[] code;
  31                 private ILGenerator ilgen;
  32                 private TypeBuilder type;
  33                 private ParameterBuilder[] pinfo;
  34                 private CustomAttributeBuilder[] cattrs;
  35                 private MethodInfo override_method;
  36                 private string pi_dll;
  37                 private string pi_entry;
  38                 private CharSet ncharset;
  39                 private CallingConvention native_cc;
  40                 private CallingConventions call_conv;
  41                 private bool init_locals = true;
  42                 private MonoGenericParam[] generic_params;
  43                 private Type[] returnModReq;
  44                 private Type[] returnModOpt;
  45                 private Type[][] paramModReq;
  46                 private Type[][] paramModOpt;
  47                 private RefEmitPermissionSet[] permissions;
  48
  49                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] returnModReq, Type[] returnModOpt, Type[] parameterTypes, Type[][] paramModReq, Type[][] paramModOpt) {
  50                         this.name = name;
  51                         this.attrs = attributes;
  52                         this.call_conv = callingConvention;
  53                         this.rtype = returnType;
  54                         this.returnModReq = returnModReq;
  55                         this.returnModOpt = returnModOpt;
  56                         this.paramModReq = paramModReq;
  57                         this.paramModOpt = paramModOpt;
  58                         // The MSDN docs does not specify this, but the MS MethodBuilder
  59                         // appends a HasThis flag if the method is not static
  60                         if ((attributes & MethodAttributes.Static) == 0)
  61                                 this.call_conv |= CallingConventions.HasThis;
  62                         if (parameterTypes != null) {
  63                                 this.parameters = new Type [parameterTypes.Length];
  64                                 System.Array.Copy (parameterTypes, this.parameters, parameterTypes.Length);
  65                         }
  66                         type = tb;
  67                         table_idx = get_next_table_index (this, 0x06, true);
  68                         //Console.WriteLine ("index for "+name+" set to "+table_idx.ToString());
  69                 }
  70
  71                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes,
  72                                                                 CallingConventions callingConvention, Type returnType, Type[] returnModReq, Type[] returnModOpt, Type[] parameterTypes, Type[][] paramModReq, Type[][] paramModOpt,
  73                         String dllName, String entryName, CallingConvention nativeCConv, CharSet nativeCharset)
  74                         : this (tb, name, attributes, callingConvention, returnType, returnModReq, returnModOpt, parameterTypes, paramModReq, paramModOpt) {
  75                         pi_dll = dllName;
  76                         pi_entry = entryName;
  77                         native_cc = nativeCConv;
  78                         ncharset = nativeCharset;
  79                 }
  80
  81                 public bool InitLocals {
  82                         get {return init_locals;}
  83                         set {init_locals = value;}
  84                 }
  85
  86                 internal TypeBuilder TypeBuilder {
  87                         get {return type;}
  88                 }
  89
  90                 public override RuntimeMethodHandle MethodHandle {
  91                         get {
  92                                 throw NotSupported ();
  93                         }
  94                 }
  95
  96                 public override Type ReturnType {get {return rtype;}}
  97                 public override Type ReflectedType {get {return type;}}
  98                 public override Type DeclaringType {get {return type;}}
  99                 public override string Name {get {return name;}}
 100                 public override MethodAttributes Attributes {get {return attrs;}}
 101                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 102                         get {return null;}
 103                 }
 104
 105                 public override CallingConventions CallingConvention {
 106                         get { return call_conv; }
 107                 }
 108
 109                 [MonoTODO]
 110                 public string Signature {
 111                         get {
 112                                 throw new NotImplementedException ();
 113                         }
 114                 }
 115
 116                 public MethodToken GetToken() {
 117                         return new MethodToken(0x06000000 | table_idx);
 118                 }
 119
 120                 public override MethodInfo GetBaseDefinition() {
 121                         return this;
 122                 }
 123                 public override MethodImplAttributes GetMethodImplementationFlags() {
 124                         return iattrs;
 125                 }
 126                 public override ParameterInfo[] GetParameters() {
 127                         if (parameters == null)
 128                                 return null;
 129
 130                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 131                         for (int i = 0; i < parameters.Length; i++) {
 132                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 133                         }
 134                         return retval;
 135                 }
 136
 137                 internal override int GetParameterCount ()
 138                 {
 139                         if (parameters == null)
 140                                 return 0;
 141
 142                         return parameters.Length;
 143                 }
 144
 145                 public Module GetModule () {
 146                         return type.Module;
 147                 }
 148
 149                 public void CreateMethodBody( byte[] il, int count) {
 150                         if ((il != null) && ((count < 0) || (count > il.Length)))
 151                                 throw new ArgumentException ("Index was out of range.  Must be non-negative and less than the size of the collection.");
 152
 153                         if ((code != null) || type.is_created)
 154                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 155
 156                         if (il == null)
 157                                 code = null;
 158                         else {
 159                                 code = new byte [count];
 160                                 System.Array.Copy(il, code, count);
 161                         }
 162                 }
 163
 164                 public override Object Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) {
 165                         throw NotSupported ();
 166                 }
 167                 public override bool IsDefined (Type attribute_type, bool inherit) {
 168                         throw NotSupported ();
 169                 }
 170                 public override object[] GetCustomAttributes( bool inherit) {
 171                         throw NotSupported ();
 172                 }
 173                 public override object[] GetCustomAttributes( Type attributeType, bool inherit) {
 174                         throw NotSupported ();
 175                 }
 176                 public ILGenerator GetILGenerator () {
 177                         return GetILGenerator (64);
 178                 }
 179
 180                 public ILGenerator GetILGenerator (int size) {
 181                         if (((iattrs & MethodImplAttributes.CodeTypeMask) !=
 182                                  MethodImplAttributes.IL) ||
 183                                 ((iattrs & MethodImplAttributes.ManagedMask) !=
 184                                  MethodImplAttributes.Managed))
 185                                 throw new InvalidOperationException ("Method body should not exist.");
 186                         if (ilgen != null)
 187                                 return ilgen;
 188                         ilgen = new ILGenerator (type.Module, ((ModuleBuilder)type.Module).GetTokenGenerator (), size);
 189                         return ilgen;
 190                 }
 191
 192                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string strParamName)
 193                 {
 194                         //
 195                         // Extension: Mono allows position == 0 for the return attribute
 196                         //
 197                         if ((position < 0) || (position > parameters.Length))
 198                                 throw new ArgumentOutOfRangeException ("position");
 199
 200                         RejectIfCreated ();
 201
 202                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, strParamName);
 203                         if (pinfo == null)
 204                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 205                         pinfo [position] = pb;
 206                         return pb;
 207                 }
 208
 209                 internal void fixup () {
 210                         if (ilgen != null)
 211                                 ilgen.label_fixup ();
 212                 }
 213
 214                 public void SetCustomAttribute( CustomAttributeBuilder customBuilder) {
 215                         if (customBuilder == null)
 216                                 throw new ArgumentNullException ("customBuilder");
 217                         string attrname = customBuilder.Ctor.ReflectedType.FullName;
 218                         if (attrname == "System.Runtime.CompilerServices.MethodImplAttribute") {
 219                                 byte[] data = customBuilder.Data;
 220                                 int impla; // the (stupid) ctor takes a short or an int ...
 221                                 impla = (int)data [2];
 222                                 impla |= ((int)data [3]) << 8;
 223                                 SetImplementationFlags ((MethodImplAttributes)impla);
 224                                 return;
 225                         }
 226                         if (cattrs != null) {
 227                                 CustomAttributeBuilder[] new_array = new CustomAttributeBuilder [cattrs.Length + 1];
 228                                 cattrs.CopyTo (new_array, 0);
 229                                 new_array [cattrs.Length] = customBuilder;
 230                                 cattrs = new_array;
 231                         } else {
 232                                 cattrs = new CustomAttributeBuilder [1];
 233                                 cattrs [0] = customBuilder;
 234                         }
 235                 }
 236                 public void SetCustomAttribute( ConstructorInfo con, byte[] binaryAttribute) {
 237                         if (con == null)
 238                                 throw new ArgumentNullException ("con");
 239                         if (binaryAttribute == null)
 240                                 throw new ArgumentNullException ("binaryAttribute");
 241                         SetCustomAttribute (new CustomAttributeBuilder (con, binaryAttribute));
 242                 }
 243                 public void SetImplementationFlags( MethodImplAttributes attributes) {
 244                         RejectIfCreated ();
 245                         iattrs = attributes;
 246                 }
 247
 248                 public void AddDeclarativeSecurity( SecurityAction action, PermissionSet pset) {
 249                         if (pset == null)
 250                                 throw new ArgumentNullException ("pset");
 251                         if ((action == SecurityAction.RequestMinimum) ||
 252                                 (action == SecurityAction.RequestOptional) ||
 253                                 (action == SecurityAction.RequestRefuse))
 254                                 throw new ArgumentException ("Request* values are not permitted", "action");
 255
 256                         RejectIfCreated ();
 257
 258                         if (permissions != null) {
 259                                 /* Check duplicate actions */
 260                                 foreach (RefEmitPermissionSet set in permissions)
 261                                         if (set.action == action)
 262                                                 throw new InvalidOperationException ("Multiple permission sets specified with the same SecurityAction.");
 263
 264                                 RefEmitPermissionSet[] new_array = new RefEmitPermissionSet [permissions.Length + 1];
 265                                 permissions.CopyTo (new_array, 0);
 266                                 permissions = new_array;
 267                         }
 268                         else
 269                                 permissions = new RefEmitPermissionSet [1];
 270
 271                         permissions [permissions.Length - 1] = new RefEmitPermissionSet (action, pset.ToXml ().ToString ());
 272                         attrs |= MethodAttributes.HasSecurity;
 273                 }
 274
 275                 [MonoTODO]
 276                 public void SetMarshal (UnmanagedMarshal unmanagedMarshal)
 277                 {
 278                         RejectIfCreated ();
 279                         throw new NotImplementedException ();
 280                 }
 281
 282                 [MonoTODO]
 283                 public void SetSymCustomAttribute (string name, byte[] data)
 284                 {
 285                         RejectIfCreated ();
 286                         throw new NotImplementedException ();
 287                 }
 288
 289                 internal override int get_next_table_index (object obj, int table, bool inc) {
 290                     return type.get_next_table_index (obj, table, inc);
 291                 }
 292
 293                 internal void set_override (MethodInfo mdecl) {
 294                         override_method = mdecl;
 295                 }
 296
 297                 private void RejectIfCreated () {
 298                         if (type.is_created)
 299                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 300                 }
 301
 302                 private Exception NotSupported () {
 303                         return new NotSupportedException ("The invoked member is not supported in a dynamic module.");
 304                 }
 305
 306 #if NET_1_2
 307                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 308                 public override extern MethodInfo BindGenericParameters (Type [] types);
 309
 310                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 311                 private extern MonoGenericParam define_generic_parameter (string name, int index);
 312
 313                 public Type DefineGenericParameter (string name)
 314                 {
 315                         int index;
 316                         if (generic_params != null) {
 317                                 MonoGenericParam[] new_generic_params = new MonoGenericParam [generic_params.Length+1];
 318                                 System.Array.Copy (generic_params, new_generic_params, generic_params.Length);
 319                                 index = generic_params.Length;
 320                                 generic_params = new_generic_params;
 321                         } else {
 322                                 generic_params = new MonoGenericParam [1];
 323                                 index = 0;
 324                         }
 325
 326                         generic_params [index] = define_generic_parameter (name, index);
 327                         return generic_params [index];
 328                 }
 329
 330                 public void SetGenericParameterConstraints (int index, Type[] constraints, bool has_ctor_constraint)
 331                 {
 332                         generic_params [index].SetConstraints (constraints, has_ctor_constraint);
 333                 }
 334
 335                 public override bool Mono_IsInflatedMethod {
 336                         get {
 337                                 return false;
 338                         }
 339                 }
 340
 341                 public override bool HasGenericParameters {
 342                         get {
 343                                 return generic_params != null;
 344                         }
 345                 }
 346
 347                 public override Type[] GetGenericArguments ()
 348                 {
 349                         if (generic_params == null)
 350                                 return new Type [0];
 351
 352                         Type[] result = new Type [generic_params.Length];
 353                         for (int i = 0; i < generic_params.Length; i++)
 354                                 result [i] = generic_params [i];
 355
 356                         return result;
 357                 }
 358
 359                 public void SetGenericMethodSignature (MethodAttributes attributes, CallingConventions callingConvention, Type return_type, Type[] parameter_types)
 360                 {
 361                         RejectIfCreated ();
 362
 363                         this.attrs = attributes;
 364                         this.call_conv = callingConvention;
 365                         if ((attributes & MethodAttributes.Static) == 0)
 366                                 this.call_conv |= CallingConventions.HasThis;
 367
 368                         this.rtype = return_type;
 369                         this.parameters = new Type [parameter_types.Length];
 370                         System.Array.Copy (parameter_types, this.parameters, parameter_types.Length);
 371                 }
 372 #endif
 373         }
 374 }
 375