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;
38 public const int Accessibility =
39 PUBLIC | PROTECTED | INTERNAL | PRIVATE;
40 public const int AllowedExplicitImplFlags =
43 static public string Name (int i)
50 case Modifiers.PUBLIC:
52 case Modifiers.PROTECTED:
53 s = "protected"; break;
54 case Modifiers.INTERNAL:
55 s = "internal"; break;
56 case Modifiers.PRIVATE:
58 case Modifiers.ABSTRACT:
59 s = "abstract"; break;
60 case Modifiers.SEALED:
62 case Modifiers.STATIC:
64 case Modifiers.READONLY:
65 s = "readonly"; break;
66 case Modifiers.VIRTUAL:
68 case Modifiers.OVERRIDE:
69 s = "override"; break;
70 case Modifiers.EXTERN:
72 case Modifiers.VOLATILE:
73 s = "volatile"; break;
74 case Modifiers.UNSAFE:
81 public static string GetDescription (MethodAttributes ma)
83 if ((ma & MethodAttributes.Assembly) != 0)
86 if ((ma & MethodAttributes.Family) != 0)
89 if ((ma & MethodAttributes.Public) != 0)
92 if ((ma & MethodAttributes.FamANDAssem) != 0)
93 return "protected internal";
95 if ((ma & MethodAttributes.Private) != 0)
98 throw new NotImplementedException (ma.ToString ());
101 public static TypeAttributes TypeAttr (int mod_flags, bool is_toplevel)
103 TypeAttributes t = 0;
106 if ((mod_flags & PUBLIC) != 0)
107 t |= TypeAttributes.Public;
108 if ((mod_flags & PRIVATE) != 0)
109 t |= TypeAttributes.NotPublic;
111 if ((mod_flags & PUBLIC) != 0)
112 t |= TypeAttributes.NestedPublic;
113 if ((mod_flags & PRIVATE) != 0)
114 t |= TypeAttributes.NestedPrivate;
115 if ((mod_flags & PROTECTED) != 0 && (mod_flags & INTERNAL) != 0)
116 t |= TypeAttributes.NestedFamORAssem;
117 if ((mod_flags & PROTECTED) != 0)
118 t |= TypeAttributes.NestedFamily;
119 if ((mod_flags & INTERNAL) != 0)
120 t |= TypeAttributes.NestedAssembly;
123 if ((mod_flags & SEALED) != 0)
124 t |= TypeAttributes.Sealed;
125 if ((mod_flags & ABSTRACT) != 0)
126 t |= TypeAttributes.Abstract;
131 public static TypeAttributes TypeAttr (int mod_flags, TypeContainer caller)
133 TypeAttributes t = TypeAttr (mod_flags, caller.IsTopLevel);
135 // If we do not have static constructors, static methods
136 // can be invoked without initializing the type.
137 if (!caller.UserDefinedStaticConstructor &&
138 (caller.Kind != Kind.Interface))
139 t |= TypeAttributes.BeforeFieldInit;
144 public static FieldAttributes FieldAttr (int mod_flags)
146 FieldAttributes fa = 0;
148 if ((mod_flags & PUBLIC) != 0)
149 fa |= FieldAttributes.Public;
150 if ((mod_flags & PRIVATE) != 0)
151 fa |= FieldAttributes.Private;
152 if ((mod_flags & PROTECTED) != 0){
153 if ((mod_flags & INTERNAL) != 0)
154 fa |= FieldAttributes.FamORAssem;
156 fa |= FieldAttributes.Family;
158 if ((mod_flags & INTERNAL) != 0)
159 fa |= FieldAttributes.Assembly;
162 if ((mod_flags & STATIC) != 0)
163 fa |= FieldAttributes.Static;
164 if ((mod_flags & READONLY) != 0)
165 fa |= FieldAttributes.InitOnly;
170 public static MethodAttributes MethodAttr (int mod_flags)
172 MethodAttributes ma = MethodAttributes.HideBySig;
174 if ((mod_flags & PUBLIC) != 0)
175 ma |= MethodAttributes.Public;
176 if ((mod_flags & PRIVATE) != 0)
177 ma |= MethodAttributes.Private;
178 if ((mod_flags & PROTECTED) != 0){
179 if ((mod_flags & INTERNAL) != 0)
180 ma |= MethodAttributes.FamORAssem;
182 ma |= MethodAttributes.Family;
184 if ((mod_flags & INTERNAL) != 0)
185 ma |= MethodAttributes.Assembly;
188 if ((mod_flags & STATIC) != 0)
189 ma |= MethodAttributes.Static;
190 if ((mod_flags & ABSTRACT) != 0){
191 ma |= MethodAttributes.Abstract | MethodAttributes.Virtual;
193 if ((mod_flags & SEALED) != 0)
194 ma |= MethodAttributes.Final;
196 if ((mod_flags & VIRTUAL) != 0)
197 ma |= MethodAttributes.Virtual;
199 if ((mod_flags & OVERRIDE) != 0)
200 ma |= MethodAttributes.Virtual;
202 if ((ma & MethodAttributes.Virtual) != 0)
203 ma |= MethodAttributes.NewSlot;
210 // Checks the object @mod modifiers to be in @allowed.
211 // Returns the new mask. Side effect: reports any
212 // incorrect attributes.
214 public static int Check (int allowed, int mod, int def_access, Location l)
216 int invalid_flags = (~allowed) & mod;
219 if (invalid_flags == 0){
222 if ((mod & Modifiers.UNSAFE) != 0){
223 RootContext.CheckUnsafeOption (l);
227 // If no accessibility bits provided
228 // then provide the defaults.
230 if ((mod & Accessibility) == 0){
236 // Make sure that no conflicting accessibility
237 // bits have been set. Protected+Internal is
238 // allowed, that is why they are placed on bits
239 // 1 and 4 (so the shift 3 basically merges them)
243 a = ((a & 2) >> 1) + (a & 5);
244 a = ((a & 4) >> 2) + (a & 3);
246 Report.Error (107, l, "More than one protection modifier specified");
251 for (i = 1; i <= TOP; i <<= 1){
252 if ((i & invalid_flags) == 0)
255 Error_InvalidModifier (l, Name (i));
258 return allowed & mod;
261 public static void Error_InvalidModifier (Location l, string name)
263 Report.Error (106, l, "The modifier `" + name + "' is not valid for this item");