mcs/mcs/modifiers.cs

   1 //
   2 // modifiers.cs: Modifier handling.
   3 //
   4 using System;
   5 using System.Reflection;
   6
   7 namespace Mono.CSharp {
   8         public class Modifiers {
   9
  10                 //
  11                 // The ordering of the following 4 constants
  12                 // has been carefully done.
  13                 //
  14                 public const int PROTECTED = 0x0001;
  15                 public const int PUBLIC    = 0x0002;
  16                 public const int PRIVATE   = 0x0004;
  17                 public const int INTERNAL  = 0x0008;
  18                 public const int NEW       = 0x0010;
  19                 public const int ABSTRACT  = 0x0020;
  20                 public const int SEALED    = 0x0040;
  21                 public const int STATIC    = 0x0080;
  22                 public const int READONLY  = 0x0100;
  23                 public const int VIRTUAL   = 0x0200;
  24                 public const int OVERRIDE  = 0x0400;
  25                 public const int EXTERN    = 0x0800;
  26                 public const int VOLATILE  = 0x1000;
  27                 public const int UNSAFE    = 0x2000;
  28                 public const int TOP       = 0x2000;
  29
  30                 public const int PROPERTY_CUSTOM = 0x4000; // Custom property modifier
  31
  32                 //
  33                 // We use this internally to flag that the method contains an iterator
  34                 //
  35                 public const int METHOD_YIELDS          = 0x8000;
  36                 public const int METHOD_GENERIC         = 0x10000;
  37                 public const int PARTIAL                = 0x20000;
  38                 public const int DEFAULT_ACCESS_MODIFER = 0x40000;
  39                 public const int METHOD_EXTENSION       = 0x80000;
  40
  41                 public const int Accessibility =
  42                         PUBLIC | PROTECTED | INTERNAL | PRIVATE;
  43                 public const int AllowedExplicitImplFlags =
  44                         UNSAFE | EXTERN;
  45
  46                 static public string Name (int i)
  47                 {
  48                         string s = "";
  49
  50                         switch (i) {
  51                         case Modifiers.NEW:
  52                                 s = "new"; break;
  53                         case Modifiers.PUBLIC:
  54                                 s = "public"; break;
  55                         case Modifiers.PROTECTED:
  56                                 s = "protected"; break;
  57                         case Modifiers.INTERNAL:
  58                                 s = "internal"; break;
  59                         case Modifiers.PRIVATE:
  60                                 s = "private"; break;
  61                         case Modifiers.ABSTRACT:
  62                                 s = "abstract"; break;
  63                         case Modifiers.SEALED:
  64                                 s = "sealed"; break;
  65                         case Modifiers.STATIC:
  66                                 s = "static"; break;
  67                         case Modifiers.READONLY:
  68                                 s = "readonly"; break;
  69                         case Modifiers.VIRTUAL:
  70                                 s = "virtual"; break;
  71                         case Modifiers.OVERRIDE:
  72                                 s = "override"; break;
  73                         case Modifiers.EXTERN:
  74                                 s = "extern"; break;
  75                         case Modifiers.VOLATILE:
  76                                 s = "volatile"; break;
  77                         case Modifiers.UNSAFE:
  78                                 s = "unsafe"; break;
  79                         }
  80
  81                         return s;
  82                 }
  83
  84                 public static string GetDescription (MethodAttributes ma)
  85                 {
  86                         if ((ma & MethodAttributes.Assembly) != 0)
  87                                 return "internal";
  88
  89                         if ((ma & MethodAttributes.Family) != 0)
  90                                 return "protected";
  91
  92                         if ((ma & MethodAttributes.Public) != 0)
  93                                 return "public";
  94
  95                         if ((ma & MethodAttributes.FamANDAssem) != 0)
  96                                 return "protected internal";
  97
  98                         if ((ma & MethodAttributes.Private) != 0)
  99                                 return "private";
 100
 101                         throw new NotImplementedException (ma.ToString ());
 102                 }
 103
 104                 public static TypeAttributes TypeAttr (int mod_flags, bool is_toplevel)
 105                 {
 106                         TypeAttributes t = 0;
 107
 108                         if (is_toplevel){
 109                                 if ((mod_flags & PUBLIC) != 0)
 110                                         t |= TypeAttributes.Public;
 111                                 if ((mod_flags & PRIVATE) != 0)
 112                                         t |= TypeAttributes.NotPublic;
 113                         } else {
 114                                 if ((mod_flags & PUBLIC) != 0)
 115                                         t |= TypeAttributes.NestedPublic;
 116                                 if ((mod_flags & PRIVATE) != 0)
 117                                         t |= TypeAttributes.NestedPrivate;
 118                                 if ((mod_flags & PROTECTED) != 0 && (mod_flags & INTERNAL) != 0)
 119                                         t |= TypeAttributes.NestedFamORAssem;
 120                                 if ((mod_flags & PROTECTED) != 0)
 121                                         t |= TypeAttributes.NestedFamily;
 122                                 if ((mod_flags & INTERNAL) != 0)
 123                                         t |= TypeAttributes.NestedAssembly;
 124                         }
 125
 126                         if ((mod_flags & SEALED) != 0)
 127                                 t |= TypeAttributes.Sealed;
 128                         if ((mod_flags & ABSTRACT) != 0)
 129                                 t |= TypeAttributes.Abstract;
 130
 131                         return t;
 132                 }
 133
 134                 public static FieldAttributes FieldAttr (int mod_flags)
 135                 {
 136                         FieldAttributes fa = 0;
 137
 138                         if ((mod_flags & PUBLIC) != 0)
 139                                 fa |= FieldAttributes.Public;
 140                         if ((mod_flags & PRIVATE) != 0)
 141                                 fa |= FieldAttributes.Private;
 142                         if ((mod_flags & PROTECTED) != 0){
 143                                 if ((mod_flags & INTERNAL) != 0)
 144                                         fa |= FieldAttributes.FamORAssem;
 145                                 else
 146                                         fa |= FieldAttributes.Family;
 147                         } else {
 148                                 if ((mod_flags & INTERNAL) != 0)
 149                                         fa |= FieldAttributes.Assembly;
 150                         }
 151
 152                         if ((mod_flags & STATIC) != 0)
 153                                 fa |= FieldAttributes.Static;
 154                         if ((mod_flags & READONLY) != 0)
 155                                 fa |= FieldAttributes.InitOnly;
 156
 157                         return fa;
 158                 }
 159
 160                 public static MethodAttributes MethodAttr (int mod_flags)
 161                 {
 162                         MethodAttributes ma = MethodAttributes.HideBySig;
 163
 164                         if ((mod_flags & PUBLIC) != 0)
 165                                 ma |= MethodAttributes.Public;
 166                         if ((mod_flags & PRIVATE) != 0)
 167                                 ma |= MethodAttributes.Private;
 168                         if ((mod_flags & PROTECTED) != 0){
 169                                 if ((mod_flags & INTERNAL) != 0)
 170                                         ma |= MethodAttributes.FamORAssem;
 171                                 else
 172                                         ma |= MethodAttributes.Family;
 173                         } else {
 174                                 if ((mod_flags & INTERNAL) != 0)
 175                                         ma |= MethodAttributes.Assembly;
 176                         }
 177
 178                         if ((mod_flags & STATIC) != 0)
 179                                 ma |= MethodAttributes.Static;
 180                         if ((mod_flags & ABSTRACT) != 0){
 181                                 ma |= MethodAttributes.Abstract | MethodAttributes.Virtual;
 182                         }
 183                         if ((mod_flags & SEALED) != 0)
 184                                 ma |= MethodAttributes.Final;
 185
 186                         if ((mod_flags & VIRTUAL) != 0)
 187                                 ma |= MethodAttributes.Virtual;
 188
 189                         if ((mod_flags & OVERRIDE) != 0)
 190                                 ma |= MethodAttributes.Virtual;
 191                         else {
 192                                 if ((ma & MethodAttributes.Virtual) != 0)
 193                                         ma |= MethodAttributes.NewSlot;
 194                         }
 195
 196                         return ma;
 197                 }
 198
 199                 // <summary>
 200                 //   Checks the object @mod modifiers to be in @allowed.
 201                 //   Returns the new mask.  Side effect: reports any
 202                 //   incorrect attributes.
 203                 // </summary>
 204                 public static int Check (int allowed, int mod, int def_access, Location l)
 205                 {
 206                         int invalid_flags  = (~allowed) & mod;
 207                         int i;
 208
 209                         if (invalid_flags == 0){
 210                                 int a = mod;
 211
 212                                 if ((mod & Modifiers.UNSAFE) != 0){
 213                                         RootContext.CheckUnsafeOption (l);
 214                                 }
 215
 216                                 //
 217                                 // If no accessibility bits provided
 218                                 // then provide the defaults.
 219                                 //
 220                                 if ((mod & Accessibility) == 0){
 221                                         mod |= def_access;
 222                                         if (def_access != 0)
 223                                                 mod |= DEFAULT_ACCESS_MODIFER;
 224                                         return mod;
 225                                 }
 226
 227                                 //
 228                                 // Make sure that no conflicting accessibility
 229                                 // bits have been set.  Protected+Internal is
 230                                 // allowed, that is why they are placed on bits
 231                                 // 1 and 4 (so the shift 3 basically merges them)
 232                                 //
 233                                 a &= 15;
 234                                 a |= (a >> 3);
 235                                 a = ((a & 2) >> 1) + (a & 5);
 236                                 a = ((a & 4) >> 2) + (a & 3);
 237                                 if (a > 1)
 238                                         Report.Error (107, l, "More than one protection modifier specified");
 239
 240                                 return mod;
 241                         }
 242
 243                         for (i = 1; i <= TOP; i <<= 1){
 244                                 if ((i & invalid_flags) == 0)
 245                                         continue;
 246
 247                                 Error_InvalidModifier (l, Name (i));
 248                         }
 249
 250                         return allowed & mod;
 251                 }
 252
 253                 public static void Error_InvalidModifier (Location l, string name)
 254                 {
 255                         Report.Error (106, l, "The modifier `" + name + "' is not valid for this item");
 256                 }
 257         }
 258 }