2 // modifiers.cs: Modifier handling.
5 using System.Reflection;
7 namespace Mono.CSharp {
8 public class Modifiers {
11 // The ordering of the following 4 constants
12 // has been carefully done.
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;
30 public const int PROPERTY_CUSTOM = 0x4000; // Custom property modifier
33 // We use this internally to flag that the method contains an iterator
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 public const int COMPILER_GENERATED = 0x100000;
42 public const int Accessibility =
43 PUBLIC | PROTECTED | INTERNAL | PRIVATE;
44 public const int AllowedExplicitImplFlags =
47 static public string Name (int i)
54 case Modifiers.PUBLIC:
56 case Modifiers.PROTECTED:
57 s = "protected"; break;
58 case Modifiers.INTERNAL:
59 s = "internal"; break;
60 case Modifiers.PRIVATE:
62 case Modifiers.ABSTRACT:
63 s = "abstract"; break;
64 case Modifiers.SEALED:
66 case Modifiers.STATIC:
68 case Modifiers.READONLY:
69 s = "readonly"; break;
70 case Modifiers.VIRTUAL:
72 case Modifiers.OVERRIDE:
73 s = "override"; break;
74 case Modifiers.EXTERN:
76 case Modifiers.VOLATILE:
77 s = "volatile"; break;
78 case Modifiers.UNSAFE:
85 public static string GetDescription (MethodAttributes ma)
87 if ((ma & MethodAttributes.Assembly) != 0)
90 if ((ma & MethodAttributes.Family) != 0)
93 if ((ma & MethodAttributes.Public) != 0)
96 if ((ma & MethodAttributes.FamANDAssem) != 0)
97 return "protected internal";
99 if ((ma & MethodAttributes.Private) != 0)
102 throw new NotImplementedException (ma.ToString ());
105 public static TypeAttributes TypeAttr (int mod_flags, bool is_toplevel)
107 TypeAttributes t = 0;
110 if ((mod_flags & PUBLIC) != 0)
111 t |= TypeAttributes.Public;
112 if ((mod_flags & PRIVATE) != 0)
113 t |= TypeAttributes.NotPublic;
115 if ((mod_flags & PUBLIC) != 0)
116 t |= TypeAttributes.NestedPublic;
117 if ((mod_flags & PRIVATE) != 0)
118 t |= TypeAttributes.NestedPrivate;
119 if ((mod_flags & PROTECTED) != 0 && (mod_flags & INTERNAL) != 0)
120 t |= TypeAttributes.NestedFamORAssem;
121 if ((mod_flags & PROTECTED) != 0)
122 t |= TypeAttributes.NestedFamily;
123 if ((mod_flags & INTERNAL) != 0)
124 t |= TypeAttributes.NestedAssembly;
127 if ((mod_flags & SEALED) != 0)
128 t |= TypeAttributes.Sealed;
129 if ((mod_flags & ABSTRACT) != 0)
130 t |= TypeAttributes.Abstract;
135 public static FieldAttributes FieldAttr (int mod_flags)
137 FieldAttributes fa = 0;
139 if ((mod_flags & PUBLIC) != 0)
140 fa |= FieldAttributes.Public;
141 if ((mod_flags & PRIVATE) != 0)
142 fa |= FieldAttributes.Private;
143 if ((mod_flags & PROTECTED) != 0){
144 if ((mod_flags & INTERNAL) != 0)
145 fa |= FieldAttributes.FamORAssem;
147 fa |= FieldAttributes.Family;
149 if ((mod_flags & INTERNAL) != 0)
150 fa |= FieldAttributes.Assembly;
153 if ((mod_flags & STATIC) != 0)
154 fa |= FieldAttributes.Static;
155 if ((mod_flags & READONLY) != 0)
156 fa |= FieldAttributes.InitOnly;
161 public static MethodAttributes MethodAttr (int mod_flags)
163 MethodAttributes ma = MethodAttributes.HideBySig;
165 if ((mod_flags & PUBLIC) != 0)
166 ma |= MethodAttributes.Public;
167 if ((mod_flags & PRIVATE) != 0)
168 ma |= MethodAttributes.Private;
169 if ((mod_flags & PROTECTED) != 0){
170 if ((mod_flags & INTERNAL) != 0)
171 ma |= MethodAttributes.FamORAssem;
173 ma |= MethodAttributes.Family;
175 if ((mod_flags & INTERNAL) != 0)
176 ma |= MethodAttributes.Assembly;
179 if ((mod_flags & STATIC) != 0)
180 ma |= MethodAttributes.Static;
181 if ((mod_flags & ABSTRACT) != 0){
182 ma |= MethodAttributes.Abstract | MethodAttributes.Virtual;
184 if ((mod_flags & SEALED) != 0)
185 ma |= MethodAttributes.Final;
187 if ((mod_flags & VIRTUAL) != 0)
188 ma |= MethodAttributes.Virtual;
190 if ((mod_flags & OVERRIDE) != 0)
191 ma |= MethodAttributes.Virtual;
193 if ((ma & MethodAttributes.Virtual) != 0)
194 ma |= MethodAttributes.NewSlot;
201 // Checks the object @mod modifiers to be in @allowed.
202 // Returns the new mask. Side effect: reports any
203 // incorrect attributes.
205 public static int Check (int allowed, int mod, int def_access, Location l)
207 int invalid_flags = (~allowed) & (mod & Modifiers.Accessibility);
210 if (invalid_flags == 0){
213 if ((mod & Modifiers.UNSAFE) != 0){
214 RootContext.CheckUnsafeOption (l);
218 // If no accessibility bits provided
219 // then provide the defaults.
221 if ((mod & Accessibility) == 0){
224 mod |= DEFAULT_ACCESS_MODIFER;
229 // Make sure that no conflicting accessibility
230 // bits have been set. Protected+Internal is
231 // allowed, that is why they are placed on bits
232 // 1 and 4 (so the shift 3 basically merges them)
236 a = ((a & 2) >> 1) + (a & 5);
237 a = ((a & 4) >> 2) + (a & 3);
239 Report.Error (107, l, "More than one protection modifier specified");
244 for (i = 1; i <= TOP; i <<= 1){
245 if ((i & invalid_flags) == 0)
248 Error_InvalidModifier (l, Name (i));
251 return allowed & mod;
254 public static void Error_InvalidModifier (Location l, string name)
256 Report.Error (106, l, "The modifier `" + name + "' is not valid for this item");