mcs/class/corlib/System.Reflection/MonoParameterInfo.cs

   1 // System.Reflection.ParameterInfo
   2 //
   3 // Authors:
   4 //   Sean MacIsaac (macisaac@ximian.com)
   5 //   Marek Safar (marek.safar@gmail.com)
   6 //
   7 // (C) 2001 Ximian, Inc.
   8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
   9 // Copyright 2013 Xamarin, Inc (http://www.xamarin.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 #if !FULL_AOT_RUNTIME
  32 using System.Reflection.Emit;
  33 #endif
  34 using System.Runtime.CompilerServices;
  35 using System.Runtime.InteropServices;
  36 using System.Collections.Generic;
  37 using System.Text;
  38
  39 namespace System.Reflection
  40 {
  41         abstract class RuntimeParameterInfo : ParameterInfo
  42         {
  43
  44         }
  45
  46         [ComVisible (true)]
  47         [ComDefaultInterfaceAttribute (typeof (_ParameterInfo))]
  48         [Serializable]
  49         [ClassInterfaceAttribute (ClassInterfaceType.None)]
  50         [StructLayout (LayoutKind.Sequential)]
  51         class MonoParameterInfo : RuntimeParameterInfo {
  52
  53 #if !FULL_AOT_RUNTIME
  54                 internal MonoParameterInfo (ParameterBuilder pb, Type type, MemberInfo member, int position) {
  55                         this.ClassImpl = type;
  56                         this.MemberImpl = member;
  57                         if (pb != null) {
  58                                 this.NameImpl = pb.Name;
  59                                 this.PositionImpl = pb.Position - 1;    // ParameterInfo.Position is zero-based
  60                                 this.AttrsImpl = (ParameterAttributes) pb.Attributes;
  61                         } else {
  62                                 this.NameImpl = null;
  63                                 this.PositionImpl = position - 1;
  64                                 this.AttrsImpl = ParameterAttributes.None;
  65                         }
  66                 }
  67 #endif
  68
  69                 /*FIXME this constructor looks very broken in the position parameter*/
  70                 internal MonoParameterInfo (ParameterInfo pinfo, Type type, MemberInfo member, int position) {
  71                         this.ClassImpl = type;
  72                         this.MemberImpl = member;
  73                         if (pinfo != null) {
  74                                 this.NameImpl = pinfo.Name;
  75                                 this.PositionImpl = pinfo.Position - 1; // ParameterInfo.Position is zero-based
  76                                 this.AttrsImpl = (ParameterAttributes) pinfo.Attributes;
  77                         } else {
  78                                 this.NameImpl = null;
  79                                 this.PositionImpl = position - 1;
  80                                 this.AttrsImpl = ParameterAttributes.None;
  81                         }
  82                 }
  83
  84                 internal MonoParameterInfo (ParameterInfo pinfo, MemberInfo member) {
  85                         this.ClassImpl = pinfo.ParameterType;
  86                         this.MemberImpl = member;
  87                         this.NameImpl = pinfo.Name;
  88                         this.PositionImpl = pinfo.Position;
  89                         this.AttrsImpl = pinfo.Attributes;
  90                         this.DefaultValueImpl = pinfo.GetDefaultValueImpl ();
  91                         //this.parent = pinfo;
  92                 }
  93
  94                 /* to build a ParameterInfo for the return type of a method */
  95                 internal MonoParameterInfo (Type type, MemberInfo member, MarshalAsAttribute marshalAs) {
  96                         this.ClassImpl = type;
  97                         this.MemberImpl = member;
  98                         this.NameImpl = "";
  99                         this.PositionImpl = -1; // since parameter positions are zero-based, return type pos is -1
 100                         this.AttrsImpl = ParameterAttributes.Retval;
 101                         this.marshalAs = marshalAs;
 102                 }
 103
 104                 public override
 105                 object DefaultValue {
 106                         get {
 107                                 if (ClassImpl == typeof (Decimal)) {
 108                                         /* default values for decimals are encoded using a custom attribute */
 109                                         DecimalConstantAttribute[] attrs = (DecimalConstantAttribute[])GetCustomAttributes (typeof (DecimalConstantAttribute), false);
 110                                         if (attrs.Length > 0)
 111                                                 return attrs [0].Value;
 112                                 } else if (ClassImpl == typeof (DateTime)) {
 113                                         /* default values for DateTime are encoded using a custom attribute */
 114                                         DateTimeConstantAttribute[] attrs = (DateTimeConstantAttribute[])GetCustomAttributes (typeof (DateTimeConstantAttribute), false);
 115                                         if (attrs.Length > 0)
 116                                                 return attrs [0].Value;
 117                                 }
 118                                 return DefaultValueImpl;
 119                         }
 120                 }
 121
 122                 public override
 123                 object RawDefaultValue {
 124                         get {
 125                                 /*FIXME right now DefaultValue doesn't throw for reflection-only assemblies. Change this once the former is fixed.*/
 126                                 return DefaultValue;
 127                         }
 128                 }
 129
 130                 public
 131                 override
 132                 int MetadataToken {
 133                         get {
 134                                 if (MemberImpl is PropertyInfo) {
 135                                         PropertyInfo prop = (PropertyInfo)MemberImpl;
 136                                         MethodInfo mi = prop.GetGetMethod (true);
 137                                         if (mi == null)
 138                                                 mi = prop.GetSetMethod (true);
 139
 140                                         return mi.GetParametersInternal () [PositionImpl].MetadataToken;
 141                                 } else if (MemberImpl is MethodBase) {
 142                                         return GetMetadataToken ();
 143                                 }
 144                                 throw new ArgumentException ("Can't produce MetadataToken for member of type " + MemberImpl.GetType ());
 145                         }
 146                 }
 147
 148
 149                 public
 150                 override
 151                 object[] GetCustomAttributes (bool inherit)
 152                 {
 153                         return MonoCustomAttrs.GetCustomAttributes (this, inherit);
 154                 }
 155
 156                 public
 157                 override
 158                 object[] GetCustomAttributes (Type attributeType, bool inherit)
 159                 {
 160                         return MonoCustomAttrs.GetCustomAttributes (this, attributeType, inherit);
 161                 }
 162
 163
 164                 public
 165                 override
 166                 bool IsDefined( Type attributeType, bool inherit) {
 167                         return MonoCustomAttrs.IsDefined (this, attributeType, inherit);
 168                 }
 169
 170                 public override IList<CustomAttributeData> GetCustomAttributesData () {
 171                         return CustomAttributeData.GetCustomAttributes (this);
 172                 }
 173
 174
 175                 public
 176                 override
 177                 Type[] GetOptionalCustomModifiers () {
 178                         Type[] types = GetTypeModifiers (true);
 179                         if (types == null)
 180                                 return Type.EmptyTypes;
 181                         return types;
 182                 }
 183
 184                 public
 185                 override
 186                 Type[] GetRequiredCustomModifiers () {
 187                         Type[] types = GetTypeModifiers (false);
 188                         if (types == null)
 189                                 return Type.EmptyTypes;
 190                         return types;
 191                 }
 192
 193                 public override bool HasDefaultValue {
 194                         get {
 195                                 object defaultValue = DefaultValue;
 196                                 if (defaultValue == null)
 197                                         return true;
 198
 199                                 if (defaultValue.GetType () == typeof(DBNull) || defaultValue.GetType () == typeof(Missing))
 200                                         return false;
 201
 202                                 return true;
 203                         }
 204                 }
 205         }
 206 }