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;
37 public const int Accessibility =
38 PUBLIC | PROTECTED | INTERNAL | PRIVATE;
39 public const int AllowedExplicitImplFlags =
42 static public string Name (int i)
49 case Modifiers.PUBLIC:
51 case Modifiers.PROTECTED:
52 s = "protected"; break;
53 case Modifiers.INTERNAL:
54 s = "internal"; break;
55 case Modifiers.PRIVATE:
57 case Modifiers.ABSTRACT:
58 s = "abstract"; break;
59 case Modifiers.SEALED:
61 case Modifiers.STATIC:
63 case Modifiers.READONLY:
64 s = "readonly"; break;
65 case Modifiers.VIRTUAL:
67 case Modifiers.OVERRIDE:
68 s = "override"; break;
69 case Modifiers.EXTERN:
71 case Modifiers.VOLATILE:
72 s = "volatile"; break;
73 case Modifiers.UNSAFE:
80 public static string GetDescription (MethodAttributes ma)
82 if ((ma & MethodAttributes.Assembly) != 0)
85 if ((ma & MethodAttributes.Family) != 0)
88 if ((ma & MethodAttributes.Public) != 0)
91 if ((ma & MethodAttributes.FamANDAssem) != 0)
92 return "protected internal";
94 if ((ma & MethodAttributes.Private) != 0)
97 throw new NotImplementedException (ma.ToString ());
100 public static TypeAttributes TypeAttr (int mod_flags, bool is_toplevel)
102 TypeAttributes t = 0;
105 if ((mod_flags & PUBLIC) != 0)
106 t |= TypeAttributes.Public;
107 if ((mod_flags & PRIVATE) != 0)
108 t |= TypeAttributes.NotPublic;
110 if ((mod_flags & PUBLIC) != 0)
111 t |= TypeAttributes.NestedPublic;
112 if ((mod_flags & PRIVATE) != 0)
113 t |= TypeAttributes.NestedPrivate;
114 if ((mod_flags & PROTECTED) != 0 && (mod_flags & INTERNAL) != 0)
115 t |= TypeAttributes.NestedFamORAssem;
116 if ((mod_flags & PROTECTED) != 0)
117 t |= TypeAttributes.NestedFamily;
118 if ((mod_flags & INTERNAL) != 0)
119 t |= TypeAttributes.NestedAssembly;
122 if ((mod_flags & SEALED) != 0)
123 t |= TypeAttributes.Sealed;
124 if ((mod_flags & ABSTRACT) != 0)
125 t |= TypeAttributes.Abstract;
130 public static TypeAttributes TypeAttr (int mod_flags, TypeContainer caller)
132 TypeAttributes t = TypeAttr (mod_flags, caller.IsTopLevel);
134 // If we do not have static constructors, static methods
135 // can be invoked without initializing the type.
136 if (!caller.UserDefinedStaticConstructor &&
137 (caller.Kind != Kind.Interface))
138 t |= TypeAttributes.BeforeFieldInit;
143 public static FieldAttributes FieldAttr (int mod_flags)
145 FieldAttributes fa = 0;
147 if ((mod_flags & PUBLIC) != 0)
148 fa |= FieldAttributes.Public;
149 if ((mod_flags & PRIVATE) != 0)
150 fa |= FieldAttributes.Private;
151 if ((mod_flags & PROTECTED) != 0){
152 if ((mod_flags & INTERNAL) != 0)
153 fa |= FieldAttributes.FamORAssem;
155 fa |= FieldAttributes.Family;
157 if ((mod_flags & INTERNAL) != 0)
158 fa |= FieldAttributes.Assembly;
161 if ((mod_flags & STATIC) != 0)
162 fa |= FieldAttributes.Static;
163 if ((mod_flags & READONLY) != 0)
164 fa |= FieldAttributes.InitOnly;
169 public static MethodAttributes MethodAttr (int mod_flags)
171 MethodAttributes ma = MethodAttributes.HideBySig;
173 if ((mod_flags & PUBLIC) != 0)
174 ma |= MethodAttributes.Public;
175 if ((mod_flags & PRIVATE) != 0)
176 ma |= MethodAttributes.Private;
177 if ((mod_flags & PROTECTED) != 0){
178 if ((mod_flags & INTERNAL) != 0)
179 ma |= MethodAttributes.FamORAssem;
181 ma |= MethodAttributes.Family;
183 if ((mod_flags & INTERNAL) != 0)
184 ma |= MethodAttributes.Assembly;
187 if ((mod_flags & STATIC) != 0)
188 ma |= MethodAttributes.Static;
189 if ((mod_flags & ABSTRACT) != 0){
190 ma |= MethodAttributes.Abstract | MethodAttributes.Virtual;
192 if ((mod_flags & SEALED) != 0)
193 ma |= MethodAttributes.Final;
195 if ((mod_flags & VIRTUAL) != 0)
196 ma |= MethodAttributes.Virtual;
198 if ((mod_flags & OVERRIDE) != 0)
199 ma |= MethodAttributes.Virtual;
201 if ((ma & MethodAttributes.Virtual) != 0)
202 ma |= MethodAttributes.NewSlot;
209 // Checks the object @mod modifiers to be in @allowed.
210 // Returns the new mask. Side effect: reports any
211 // incorrect attributes.
213 public static int Check (int allowed, int mod, int def_access, Location l)
215 int invalid_flags = (~allowed) & mod;
218 if (invalid_flags == 0){
221 if ((mod & Modifiers.UNSAFE) != 0){
222 RootContext.CheckUnsafeOption (l);
226 // If no accessibility bits provided
227 // then provide the defaults.
229 if ((mod & Accessibility) == 0){
235 // Make sure that no conflicting accessibility
236 // bits have been set. Protected+Internal is
237 // allowed, that is why they are placed on bits
238 // 1 and 4 (so the shift 3 basically merges them)
242 a = ((a & 2) >> 1) + (a & 5);
243 a = ((a & 4) >> 2) + (a & 3);
245 Report.Error (107, l, "More than one protection modifier specified");
250 for (i = 1; i <= TOP; i <<= 1){
251 if ((i & invalid_flags) == 0)
254 Error_InvalidModifier (l, Name (i));
257 return allowed & mod;
260 public static void Error_InvalidModifier (Location l, string name)
262 Report.Error (106, l, "The modifier `" + name + "' is not valid for this item");