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.Runtime.CompilerServices;
  16 using System.Runtime.InteropServices;
  17
  18 namespace System.Reflection.Emit {
  19
  20         public sealed class MethodBuilder : MethodInfo {
  21                 private RuntimeMethodHandle mhandle;
  22                 private Type rtype;
  23                 private Type[] parameters;
  24                 private MethodAttributes attrs;
  25                 private MethodImplAttributes iattrs;
  26                 private string name;
  27                 private int table_idx;
  28                 private byte[] code;
  29                 private ILGenerator ilgen;
  30                 private TypeBuilder type;
  31                 private ParameterBuilder[] pinfo;
  32                 private CustomAttributeBuilder[] cattrs;
  33                 private MethodInfo override_method;
  34                 private string pi_dll;
  35                 private string pi_entry;
  36                 private CharSet ncharset;
  37                 private CallingConvention native_cc;
  38                 private CallingConventions call_conv;
  39                 private bool init_locals = true;
  40                 private TypeBuilder.MonoGenericParam[] generic_params;
  41                 private Type[] returnModReq;
  42                 private Type[] returnModOpt;
  43                 private Type[][] paramModReq;
  44                 private Type[][] paramModOpt;
  45
  46                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] returnModReq, Type[] returnModOpt, Type[] parameterTypes, Type[][] paramModReq, Type[][] paramModOpt) {
  47                         this.name = name;
  48                         this.attrs = attributes;
  49                         this.call_conv = callingConvention;
  50                         this.rtype = returnType;
  51                         this.returnModReq = returnModReq;
  52                         this.returnModOpt = returnModOpt;
  53                         this.paramModReq = paramModReq;
  54                         this.paramModOpt = paramModOpt;
  55                         // The MSDN docs does not specify this, but the MS MethodBuilder
  56                         // appends a HasThis flag if the method is not static
  57                         if ((attributes & MethodAttributes.Static) == 0)
  58                                 this.call_conv |= CallingConventions.HasThis;
  59                         if (parameterTypes != null) {
  60                                 this.parameters = new Type [parameterTypes.Length];
  61                                 System.Array.Copy (parameterTypes, this.parameters, parameterTypes.Length);
  62                         }
  63                         type = tb;
  64                         table_idx = get_next_table_index (this, 0x06, true);
  65                         //Console.WriteLine ("index for "+name+" set to "+table_idx.ToString());
  66                 }
  67
  68                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes,
  69                                                                 CallingConventions callingConvention, Type returnType, Type[] returnModReq, Type[] returnModOpt, Type[] parameterTypes, Type[][] paramModReq, Type[][] paramModOpt,
  70                         String dllName, String entryName, CallingConvention nativeCConv, CharSet nativeCharset)
  71                         : this (tb, name, attributes, callingConvention, returnType, returnModReq, returnModOpt, parameterTypes, paramModReq, paramModOpt) {
  72                         pi_dll = dllName;
  73                         pi_entry = entryName;
  74                         native_cc = nativeCConv;
  75                         ncharset = nativeCharset;
  76                 }
  77
  78                 public bool InitLocals {
  79                         get {return init_locals;}
  80                         set {init_locals = value;}
  81                 }
  82
  83                 internal TypeBuilder TypeBuilder {
  84                         get {return type;}
  85                 }
  86
  87                 public override RuntimeMethodHandle MethodHandle {
  88                         get {
  89                                 throw NotSupported ();
  90                         }
  91                 }
  92
  93                 public override Type ReturnType {get {return rtype;}}
  94                 public override Type ReflectedType {get {return type;}}
  95                 public override Type DeclaringType {get {return type;}}
  96                 public override string Name {get {return name;}}
  97                 public override MethodAttributes Attributes {get {return attrs;}}
  98                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
  99                         get {return null;}
 100                 }
 101
 102                 public override CallingConventions CallingConvention {
 103                         get { return call_conv; }
 104                 }
 105
 106                 public MethodToken GetToken() {
 107                         return new MethodToken(0x06000000 | table_idx);
 108                 }
 109
 110                 public override MethodInfo GetBaseDefinition() {
 111                         return this;
 112                 }
 113                 public override MethodImplAttributes GetMethodImplementationFlags() {
 114                         return iattrs;
 115                 }
 116                 public override ParameterInfo[] GetParameters() {
 117                         if (parameters == null)
 118                                 return null;
 119
 120                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 121                         for (int i = 0; i < parameters.Length; i++) {
 122                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 123                         }
 124                         return retval;
 125                 }
 126
 127                 public Module GetModule () {
 128                         return type.Module;
 129                 }
 130
 131                 public void CreateMethodBody( byte[] il, int count) {
 132                         if ((il != null) && ((count < 0) || (count > il.Length)))
 133                                 throw new ArgumentException ("Index was out of range.  Must be non-negative and less than the size of the collection.");
 134
 135                         if ((code != null) || type.is_created)
 136                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 137
 138                         if (il == null)
 139                                 code = null;
 140                         else {
 141                                 code = new byte [count];
 142                                 System.Array.Copy(il, code, count);
 143                         }
 144                 }
 145
 146                 public override Object Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) {
 147                         throw NotSupported ();
 148                 }
 149                 public override bool IsDefined (Type attribute_type, bool inherit) {
 150                         throw NotSupported ();
 151                 }
 152                 public override object[] GetCustomAttributes( bool inherit) {
 153                         throw NotSupported ();
 154                 }
 155                 public override object[] GetCustomAttributes( Type attributeType, bool inherit) {
 156                         throw NotSupported ();
 157                 }
 158                 public ILGenerator GetILGenerator () {
 159                         return GetILGenerator (64);
 160                 }
 161
 162                 public ILGenerator GetILGenerator (int size) {
 163                         if (((iattrs & MethodImplAttributes.CodeTypeMask) !=
 164                                  MethodImplAttributes.IL) ||
 165                                 ((iattrs & MethodImplAttributes.ManagedMask) !=
 166                                  MethodImplAttributes.Managed))
 167                                 throw new InvalidOperationException ("Method body should not exist.");
 168                         if (ilgen != null)
 169                                 return ilgen;
 170                         ilgen = new ILGenerator (this, size);
 171                         return ilgen;
 172                 }
 173
 174                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string strParamName)
 175                 {
 176                         //
 177                         // Extension: Mono allows position == 0 for the return attribute
 178                         //
 179                         if ((position < 0) || (position > parameters.Length))
 180                                 throw new ArgumentOutOfRangeException ("position");
 181
 182                         RejectIfCreated ();
 183
 184                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, strParamName);
 185                         if (pinfo == null)
 186                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 187                         pinfo [position] = pb;
 188                         return pb;
 189                 }
 190
 191                 internal void fixup () {
 192                         if (ilgen != null)
 193                                 ilgen.label_fixup ();
 194                 }
 195
 196                 public void SetCustomAttribute( CustomAttributeBuilder customBuilder) {
 197                         if (customBuilder == null)
 198                                 throw new ArgumentNullException ("customBuilder");
 199                         string attrname = customBuilder.Ctor.ReflectedType.FullName;
 200                         if (attrname == "System.Runtime.CompilerServices.MethodImplAttribute") {
 201                                 byte[] data = customBuilder.Data;
 202                                 int impla; // the (stupid) ctor takes a short or an int ...
 203                                 impla = (int)data [2];
 204                                 impla |= ((int)data [3]) << 8;
 205                                 SetImplementationFlags ((MethodImplAttributes)impla);
 206                                 return;
 207                         }
 208                         if (cattrs != null) {
 209                                 CustomAttributeBuilder[] new_array = new CustomAttributeBuilder [cattrs.Length + 1];
 210                                 cattrs.CopyTo (new_array, 0);
 211                                 new_array [cattrs.Length] = customBuilder;
 212                                 cattrs = new_array;
 213                         } else {
 214                                 cattrs = new CustomAttributeBuilder [1];
 215                                 cattrs [0] = customBuilder;
 216                         }
 217                 }
 218                 public void SetCustomAttribute( ConstructorInfo con, byte[] binaryAttribute) {
 219                         if (con == null)
 220                                 throw new ArgumentNullException ("con");
 221                         if (binaryAttribute == null)
 222                                 throw new ArgumentNullException ("binaryAttribute");
 223                         SetCustomAttribute (new CustomAttributeBuilder (con, binaryAttribute));
 224                 }
 225                 public void SetImplementationFlags( MethodImplAttributes attributes) {
 226                         RejectIfCreated ();
 227                         iattrs = attributes;
 228                 }
 229                 internal override int get_next_table_index (object obj, int table, bool inc) {
 230                     return type.get_next_table_index (obj, table, inc);
 231                 }
 232
 233                 internal void set_override (MethodInfo mdecl) {
 234                         override_method = mdecl;
 235                 }
 236
 237                 private void RejectIfCreated () {
 238                         if (type.is_created)
 239                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 240                 }
 241
 242                 private Exception NotSupported () {
 243                         return new NotSupportedException ("The invoked member is not supported in a dynamic module.");
 244                 }
 245
 246 #if NET_1_2
 247                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 248                 private extern Type define_generic_parameter (TypeBuilder.MonoGenericParam param);
 249
 250                 public Type DefineGenericParameter (string name, Type[] constraints)
 251                 {
 252                         TypeBuilder.MonoGenericParam gparam = new TypeBuilder.MonoGenericParam (name, constraints);
 253
 254                         if (generic_params != null) {
 255                                 TypeBuilder.MonoGenericParam[] new_generic_params = new TypeBuilder.MonoGenericParam [generic_params.Length+1];
 256                                 System.Array.Copy (generic_params, new_generic_params, generic_params.Length);
 257                                 new_generic_params [generic_params.Length] = gparam;
 258                                 generic_params = new_generic_params;
 259                         } else {
 260                                 generic_params = new TypeBuilder.MonoGenericParam [1];
 261                                 generic_params [0] = gparam;
 262                         }
 263
 264                         return define_generic_parameter (gparam);
 265                 }
 266
 267                 public override Type[] GetGenericArguments ()
 268                 {
 269                         if (generic_params == null)
 270                                 return new Type [0];
 271
 272                         Type[] result = new Type [generic_params.Length];
 273                         for (int i = 0; i < generic_params.Length; i++)
 274                                 result [i] = generic_params [i].Type;
 275
 276                         return result;
 277                 }
 278
 279                 public void SetGenericMethodSignature (Type return_type, Type[] parameter_types)
 280                 {
 281                         RejectIfCreated ();
 282
 283                         this.rtype = return_type;
 284                         this.parameters = new Type [parameter_types.Length];
 285                         System.Array.Copy (parameter_types, this.parameters, parameter_types.Length);
 286                 }
 287 #endif
 288         }
 289 }
 290