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