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