1 //
2 // FieldDefinition.cs
3 //
4 // Author:
5 //   Jb Evain (jbevain@gmail.com)
6 //
7 // Copyright (c) 2008 - 2011 Jb Evain
8 //
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
16 //
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
19 //
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 //
28 
29 using Mono.Collections.Generic;
30 
31 namespace Mono.Cecil {
32 
33 	public sealed class FieldDefinition : FieldReference, IMemberDefinition, IConstantProvider, IMarshalInfoProvider {
34 
35 		ushort attributes;
36 		Collection<CustomAttribute> custom_attributes;
37 
38 		int offset = Mixin.NotResolvedMarker;
39 
40 		internal int rva = Mixin.NotResolvedMarker;
41 		byte [] initial_value;
42 
43 		object constant = Mixin.NotResolved;
44 
45 		MarshalInfo marshal_info;
46 
ResolveLayout()47 		void ResolveLayout ()
48 		{
49 			if (offset != Mixin.NotResolvedMarker)
50 				return;
51 
52 			if (!HasImage) {
53 				offset = Mixin.NoDataMarker;
54 				return;
55 			}
56 
57 			offset = Module.Read (this, (field, reader) => reader.ReadFieldLayout (field));
58 		}
59 
60 		public bool HasLayoutInfo {
61 			get {
62 				if (offset >= 0)
63 					return true;
64 
65 				ResolveLayout ();
66 
67 				return offset >= 0;
68 			}
69 		}
70 
71 		public int Offset {
72 			get {
73 				if (offset >= 0)
74 					return offset;
75 
76 				ResolveLayout ();
77 
78 				return offset >= 0 ? offset : -1;
79 			}
80 			set { offset = value; }
81 		}
82 
ResolveRVA()83 		void ResolveRVA ()
84 		{
85 			if (rva != Mixin.NotResolvedMarker)
86 				return;
87 
88 			if (!HasImage)
89 				return;
90 
91 			rva = Module.Read (this, (field, reader) => reader.ReadFieldRVA (field));
92 		}
93 
94 		public int RVA {
95 			get {
96 				if (rva > 0)
97 					return rva;
98 
99 				ResolveRVA ();
100 
101 				return rva > 0 ? rva : 0;
102 			}
103 		}
104 
105 		public byte [] InitialValue {
106 			get {
107 				if (initial_value != null)
108 					return initial_value;
109 
110 				ResolveRVA ();
111 
112 				if (initial_value == null)
113 					initial_value = Empty<byte>.Array;
114 
115 				return initial_value;
116 			}
117 			set { initial_value = value; }
118 		}
119 
120 		public FieldAttributes Attributes {
121 			get { return (FieldAttributes) attributes; }
122 			set { attributes = (ushort) value; }
123 		}
124 
125 		public bool HasConstant {
126 			get {
127 				ResolveConstant ();
128 
129 				return constant != Mixin.NoValue;
130 			}
131 			set { if (!value) constant = Mixin.NoValue; }
132 		}
133 
134 		public object Constant {
135 			get { return HasConstant ? constant : null;	}
136 			set { constant = value; }
137 		}
138 
ResolveConstant()139 		void ResolveConstant ()
140 		{
141 			if (constant != Mixin.NotResolved)
142 				return;
143 
144 			this.ResolveConstant (ref constant, Module);
145 		}
146 
147 		public bool HasCustomAttributes {
148 			get {
149 				if (custom_attributes != null)
150 					return custom_attributes.Count > 0;
151 
152 				return this.GetHasCustomAttributes (Module);
153 			}
154 		}
155 
156 		public Collection<CustomAttribute> CustomAttributes {
157 			get { return custom_attributes ?? (custom_attributes = this.GetCustomAttributes (Module)); }
158 		}
159 
160 		public bool HasMarshalInfo {
161 			get {
162 				if (marshal_info != null)
163 					return true;
164 
165 				return this.GetHasMarshalInfo (Module);
166 			}
167 		}
168 
169 		public MarshalInfo MarshalInfo {
170 			get { return marshal_info ?? (marshal_info = this.GetMarshalInfo (Module)); }
171 			set { marshal_info = value; }
172 		}
173 
174 		#region FieldAttributes
175 
176 		public bool IsCompilerControlled {
177 			get { return attributes.GetMaskedAttributes ((ushort) FieldAttributes.FieldAccessMask, (ushort) FieldAttributes.CompilerControlled); }
178 			set { attributes = attributes.SetMaskedAttributes ((ushort) FieldAttributes.FieldAccessMask, (ushort) FieldAttributes.CompilerControlled, value); }
179 		}
180 
181 		public bool IsPrivate {
182 			get { return attributes.GetMaskedAttributes ((ushort) FieldAttributes.FieldAccessMask, (ushort) FieldAttributes.Private); }
183 			set { attributes = attributes.SetMaskedAttributes ((ushort) FieldAttributes.FieldAccessMask, (ushort) FieldAttributes.Private, value); }
184 		}
185 
186 		public bool IsFamilyAndAssembly {
187 			get { return attributes.GetMaskedAttributes ((ushort) FieldAttributes.FieldAccessMask, (ushort) FieldAttributes.FamANDAssem); }
188 			set { attributes = attributes.SetMaskedAttributes ((ushort) FieldAttributes.FieldAccessMask, (ushort) FieldAttributes.FamANDAssem, value); }
189 		}
190 
191 		public bool IsAssembly {
192 			get { return attributes.GetMaskedAttributes ((ushort) FieldAttributes.FieldAccessMask, (ushort) FieldAttributes.Assembly); }
193 			set { attributes = attributes.SetMaskedAttributes ((ushort) FieldAttributes.FieldAccessMask, (ushort) FieldAttributes.Assembly, value); }
194 		}
195 
196 		public bool IsFamily {
197 			get { return attributes.GetMaskedAttributes ((ushort) FieldAttributes.FieldAccessMask, (ushort) FieldAttributes.Family); }
198 			set { attributes = attributes.SetMaskedAttributes ((ushort) FieldAttributes.FieldAccessMask, (ushort) FieldAttributes.Family, value); }
199 		}
200 
201 		public bool IsFamilyOrAssembly {
202 			get { return attributes.GetMaskedAttributes ((ushort) FieldAttributes.FieldAccessMask, (ushort) FieldAttributes.FamORAssem); }
203 			set { attributes = attributes.SetMaskedAttributes ((ushort) FieldAttributes.FieldAccessMask, (ushort) FieldAttributes.FamORAssem, value); }
204 		}
205 
206 		public bool IsPublic {
207 			get { return attributes.GetMaskedAttributes ((ushort) FieldAttributes.FieldAccessMask, (ushort) FieldAttributes.Public); }
208 			set { attributes = attributes.SetMaskedAttributes ((ushort) FieldAttributes.FieldAccessMask, (ushort) FieldAttributes.Public, value); }
209 		}
210 
211 		public bool IsStatic {
212 			get { return attributes.GetAttributes ((ushort) FieldAttributes.Static); }
213 			set { attributes = attributes.SetAttributes ((ushort) FieldAttributes.Static, value); }
214 		}
215 
216 		public bool IsInitOnly {
217 			get { return attributes.GetAttributes ((ushort) FieldAttributes.InitOnly); }
218 			set { attributes = attributes.SetAttributes ((ushort) FieldAttributes.InitOnly, value); }
219 		}
220 
221 		public bool IsLiteral {
222 			get { return attributes.GetAttributes ((ushort) FieldAttributes.Literal); }
223 			set { attributes = attributes.SetAttributes ((ushort) FieldAttributes.Literal, value); }
224 		}
225 
226 		public bool IsNotSerialized {
227 			get { return attributes.GetAttributes ((ushort) FieldAttributes.NotSerialized); }
228 			set { attributes = attributes.SetAttributes ((ushort) FieldAttributes.NotSerialized, value); }
229 		}
230 
231 		public bool IsSpecialName {
232 			get { return attributes.GetAttributes ((ushort) FieldAttributes.SpecialName); }
233 			set { attributes = attributes.SetAttributes ((ushort) FieldAttributes.SpecialName, value); }
234 		}
235 
236 		public bool IsPInvokeImpl {
237 			get { return attributes.GetAttributes ((ushort) FieldAttributes.PInvokeImpl); }
238 			set { attributes = attributes.SetAttributes ((ushort) FieldAttributes.PInvokeImpl, value); }
239 		}
240 
241 		public bool IsRuntimeSpecialName {
242 			get { return attributes.GetAttributes ((ushort) FieldAttributes.RTSpecialName); }
243 			set { attributes = attributes.SetAttributes ((ushort) FieldAttributes.RTSpecialName, value); }
244 		}
245 
246 		public bool HasDefault {
247 			get { return attributes.GetAttributes ((ushort) FieldAttributes.HasDefault); }
248 			set { attributes = attributes.SetAttributes ((ushort) FieldAttributes.HasDefault, value); }
249 		}
250 
251 		#endregion
252 
253 		public override bool IsDefinition {
254 			get { return true; }
255 		}
256 
257 		public new TypeDefinition DeclaringType {
258 			get { return (TypeDefinition) base.DeclaringType; }
259 			set { base.DeclaringType = value; }
260 		}
261 
FieldDefinition(string name, FieldAttributes attributes, TypeReference fieldType)262 		public FieldDefinition (string name, FieldAttributes attributes, TypeReference fieldType)
263 			: base (name, fieldType)
264 		{
265 			this.attributes = (ushort) attributes;
266 		}
267 
Resolve()268 		public override FieldDefinition Resolve ()
269 		{
270 			return this;
271 		}
272 	}
273 
274 	static partial class Mixin {
275 
276 		public const int NotResolvedMarker = -2;
277 		public const int NoDataMarker = -1;
278 	}
279 }
280