2 // modifiers.cs: Modifiers handling
4 // Authors: Miguel de Icaza (miguel@gnu.org)
5 // Marek Safar (marek.safar@gmail.com)
7 // Dual licensed under the terms of the MIT X11 or GNU GPL
9 // Copyright 2001, 2002, 2003 Ximian, Inc (http://www.ximian.com)
10 // Copyright 2004-2010 Novell, Inc
16 using IKVM.Reflection;
18 using System.Reflection;
44 // Compiler specific flags
46 PROPERTY_CUSTOM = 0x10000,
49 DEFAULT_ACCESS_MODIFER = 0x40000,
50 METHOD_EXTENSION = 0x80000,
51 COMPILER_GENERATED = 0x100000,
52 BACKING_FIELD = 0x200000,
53 DEBUGGER_HIDDEN = 0x400000,
55 AccessibilityMask = PUBLIC | PROTECTED | INTERNAL | PRIVATE,
56 AllowedExplicitImplFlags = UNSAFE | EXTERN,
59 static class ModifiersExtensions
61 public static string AccessibilityName (Modifiers mod)
63 switch (mod & Modifiers.AccessibilityMask) {
64 case Modifiers.PUBLIC:
66 case Modifiers.PROTECTED:
68 case Modifiers.PROTECTED | Modifiers.INTERNAL:
69 return "protected internal";
70 case Modifiers.INTERNAL:
72 case Modifiers.PRIVATE:
75 throw new NotImplementedException (mod.ToString ());
79 static public string Name (Modifiers i)
86 case Modifiers.PUBLIC:
88 case Modifiers.PROTECTED:
89 s = "protected"; break;
90 case Modifiers.INTERNAL:
91 s = "internal"; break;
92 case Modifiers.PRIVATE:
94 case Modifiers.ABSTRACT:
95 s = "abstract"; break;
96 case Modifiers.SEALED:
98 case Modifiers.STATIC:
100 case Modifiers.READONLY:
101 s = "readonly"; break;
102 case Modifiers.VIRTUAL:
103 s = "virtual"; break;
104 case Modifiers.OVERRIDE:
105 s = "override"; break;
106 case Modifiers.EXTERN:
108 case Modifiers.VOLATILE:
109 s = "volatile"; break;
110 case Modifiers.UNSAFE:
112 case Modifiers.ASYNC:
120 // Used by custom property accessors to check whether @modA is more restrictive than @modB
122 public static bool IsRestrictedModifier (Modifiers modA, Modifiers modB)
126 if ((modB & Modifiers.PUBLIC) != 0) {
127 flags = Modifiers.PROTECTED | Modifiers.INTERNAL | Modifiers.PRIVATE;
128 } else if ((modB & Modifiers.PROTECTED) != 0) {
129 if ((modB & Modifiers.INTERNAL) != 0)
130 flags = Modifiers.PROTECTED | Modifiers.INTERNAL;
132 flags |= Modifiers.PRIVATE;
133 } else if ((modB & Modifiers.INTERNAL) != 0)
134 flags = Modifiers.PRIVATE;
136 return modB != modA && (modA & (~flags)) == 0;
139 public static TypeAttributes TypeAttr (Modifiers mod_flags, bool is_toplevel)
141 TypeAttributes t = 0;
144 if ((mod_flags & Modifiers.PUBLIC) != 0)
145 t = TypeAttributes.Public;
146 else if ((mod_flags & Modifiers.PRIVATE) != 0)
147 t = TypeAttributes.NotPublic;
149 if ((mod_flags & Modifiers.PUBLIC) != 0)
150 t = TypeAttributes.NestedPublic;
151 else if ((mod_flags & Modifiers.PRIVATE) != 0)
152 t = TypeAttributes.NestedPrivate;
153 else if ((mod_flags & (Modifiers.PROTECTED | Modifiers.INTERNAL)) == (Modifiers.PROTECTED | Modifiers.INTERNAL))
154 t = TypeAttributes.NestedFamORAssem;
155 else if ((mod_flags & Modifiers.PROTECTED) != 0)
156 t = TypeAttributes.NestedFamily;
157 else if ((mod_flags & Modifiers.INTERNAL) != 0)
158 t = TypeAttributes.NestedAssembly;
161 if ((mod_flags & Modifiers.SEALED) != 0)
162 t |= TypeAttributes.Sealed;
163 if ((mod_flags & Modifiers.ABSTRACT) != 0)
164 t |= TypeAttributes.Abstract;
169 public static FieldAttributes FieldAttr (Modifiers mod_flags)
171 FieldAttributes fa = 0;
173 if ((mod_flags & Modifiers.PUBLIC) != 0)
174 fa |= FieldAttributes.Public;
175 if ((mod_flags & Modifiers.PRIVATE) != 0)
176 fa |= FieldAttributes.Private;
177 if ((mod_flags & Modifiers.PROTECTED) != 0) {
178 if ((mod_flags & Modifiers.INTERNAL) != 0)
179 fa |= FieldAttributes.FamORAssem;
181 fa |= FieldAttributes.Family;
183 if ((mod_flags & Modifiers.INTERNAL) != 0)
184 fa |= FieldAttributes.Assembly;
187 if ((mod_flags & Modifiers.STATIC) != 0)
188 fa |= FieldAttributes.Static;
189 if ((mod_flags & Modifiers.READONLY) != 0)
190 fa |= FieldAttributes.InitOnly;
195 public static MethodAttributes MethodAttr (Modifiers mod_flags)
197 MethodAttributes ma = MethodAttributes.HideBySig;
199 switch (mod_flags & Modifiers.AccessibilityMask) {
200 case Modifiers.PUBLIC:
201 ma |= MethodAttributes.Public;
203 case Modifiers.PRIVATE:
204 ma |= MethodAttributes.Private;
206 case Modifiers.PROTECTED | Modifiers.INTERNAL:
207 ma |= MethodAttributes.FamORAssem;
209 case Modifiers.PROTECTED:
210 ma |= MethodAttributes.Family;
212 case Modifiers.INTERNAL:
213 ma |= MethodAttributes.Assembly;
216 throw new NotImplementedException (mod_flags.ToString ());
219 if ((mod_flags & Modifiers.STATIC) != 0)
220 ma |= MethodAttributes.Static;
221 if ((mod_flags & Modifiers.ABSTRACT) != 0) {
222 ma |= MethodAttributes.Abstract | MethodAttributes.Virtual;
224 if ((mod_flags & Modifiers.SEALED) != 0)
225 ma |= MethodAttributes.Final;
227 if ((mod_flags & Modifiers.VIRTUAL) != 0)
228 ma |= MethodAttributes.Virtual;
230 if ((mod_flags & Modifiers.OVERRIDE) != 0) {
231 ma |= MethodAttributes.Virtual;
233 if ((ma & MethodAttributes.Virtual) != 0)
234 ma |= MethodAttributes.NewSlot;
241 // Checks the object @mod modifiers to be in @allowed.
242 // Returns the new mask. Side effect: reports any
243 // incorrect attributes.
245 public static Modifiers Check (Modifiers allowed, Modifiers mod, Modifiers def_access, Location l, Report Report)
247 int invalid_flags = (~(int) allowed) & ((int) mod & ((int) Modifiers.TOP - 1));
250 if (invalid_flags == 0){
252 // If no accessibility bits provided
253 // then provide the defaults.
255 if ((mod & Modifiers.AccessibilityMask) == 0) {
258 mod |= Modifiers.DEFAULT_ACCESS_MODIFER;
265 for (i = 1; i <= (int) Modifiers.TOP; i <<= 1) {
266 if ((i & invalid_flags) == 0)
269 Error_InvalidModifier ((Modifiers)i, l, Report);
272 return allowed & mod;
275 static void Error_InvalidModifier (Modifiers mod, Location l, Report Report)
277 Report.Error (106, l, "The modifier `{0}' is not valid for this item",