1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
using System;
using System.Collections.Generic;
namespace Mono.Cecil {
internal sealed class TypeReferenceEqualityComparer : EqualityComparer<TypeReference> {
public override bool Equals (TypeReference x, TypeReference y)
{
return AreEqual (x, y);
}
public override int GetHashCode (TypeReference obj)
{
return GetHashCodeFor (obj);
}
public static bool AreEqual (TypeReference a, TypeReference b, TypeComparisonMode comparisonMode = TypeComparisonMode.Exact)
{
if (ReferenceEquals (a, b))
return true;
if (a == null || b == null)
return false;
var aMetadataType = a.MetadataType;
var bMetadataType = b.MetadataType;
if (aMetadataType == MetadataType.GenericInstance || bMetadataType == MetadataType.GenericInstance) {
if (aMetadataType != bMetadataType)
return false;
return AreEqual ((GenericInstanceType)a, (GenericInstanceType)b, comparisonMode);
}
if (aMetadataType == MetadataType.Array || bMetadataType == MetadataType.Array) {
if (aMetadataType != bMetadataType)
return false;
var a1 = (ArrayType)a;
var b1 = (ArrayType)b;
if (a1.Rank != b1.Rank)
return false;
return AreEqual (a1.ElementType, b1.ElementType, comparisonMode);
}
if (aMetadataType == MetadataType.Var || bMetadataType == MetadataType.Var) {
if (aMetadataType != bMetadataType)
return false;
return AreEqual ((GenericParameter)a, (GenericParameter)b, comparisonMode);
}
if (aMetadataType == MetadataType.MVar || bMetadataType == MetadataType.MVar) {
if (aMetadataType != bMetadataType)
return false;
return AreEqual ((GenericParameter)a, (GenericParameter)b, comparisonMode);
}
if (aMetadataType == MetadataType.ByReference || bMetadataType == MetadataType.ByReference) {
if (aMetadataType != bMetadataType)
return false;
return AreEqual (((ByReferenceType)a).ElementType, ((ByReferenceType)b).ElementType, comparisonMode);
}
if (aMetadataType == MetadataType.Pointer || bMetadataType == MetadataType.Pointer) {
if (aMetadataType != bMetadataType)
return false;
return AreEqual (((PointerType)a).ElementType, ((PointerType)b).ElementType, comparisonMode);
}
if (aMetadataType == MetadataType.RequiredModifier || bMetadataType == MetadataType.RequiredModifier) {
if (aMetadataType != bMetadataType)
return false;
var a1 = (RequiredModifierType)a;
var b1 = (RequiredModifierType)b;
return AreEqual (a1.ModifierType, b1.ModifierType, comparisonMode) && AreEqual (a1.ElementType, b1.ElementType, comparisonMode);
}
if (aMetadataType == MetadataType.OptionalModifier || bMetadataType == MetadataType.OptionalModifier) {
if (aMetadataType != bMetadataType)
return false;
var a1 = (OptionalModifierType)a;
var b1 = (OptionalModifierType)b;
return AreEqual (a1.ModifierType, b1.ModifierType, comparisonMode) && AreEqual (a1.ElementType, b1.ElementType, comparisonMode);
}
if (aMetadataType == MetadataType.Pinned || bMetadataType == MetadataType.Pinned) {
if (aMetadataType != bMetadataType)
return false;
return AreEqual (((PinnedType)a).ElementType, ((PinnedType)b).ElementType, comparisonMode);
}
if (aMetadataType == MetadataType.Sentinel || bMetadataType == MetadataType.Sentinel) {
if (aMetadataType != bMetadataType)
return false;
return AreEqual (((SentinelType)a).ElementType, ((SentinelType)b).ElementType, comparisonMode);
}
if (!a.Name.Equals (b.Name) || !a.Namespace.Equals (b.Namespace))
return false;
var xDefinition = a.Resolve ();
var yDefinition = b.Resolve ();
// For loose signature the types could be in different assemblies, as long as the type names match we will consider them equal
if (comparisonMode == TypeComparisonMode.SignatureOnlyLoose) {
if (xDefinition.Module.Name != yDefinition.Module.Name)
return false;
if (xDefinition.Module.Assembly.Name.Name != yDefinition.Module.Assembly.Name.Name)
return false;
return xDefinition.FullName == yDefinition.FullName;
}
return xDefinition == yDefinition;
}
static bool AreEqual (GenericParameter a, GenericParameter b, TypeComparisonMode comparisonMode = TypeComparisonMode.Exact)
{
if (ReferenceEquals (a, b))
return true;
if (a.Position != b.Position)
return false;
if (a.Type != b.Type)
return false;
var aOwnerType = a.Owner as TypeReference;
if (aOwnerType != null && AreEqual (aOwnerType, b.Owner as TypeReference, comparisonMode))
return true;
var aOwnerMethod = a.Owner as MethodReference;
if (aOwnerMethod != null && comparisonMode != TypeComparisonMode.SignatureOnlyLoose && MethodReferenceComparer.AreEqual (aOwnerMethod, b.Owner as MethodReference))
return true;
return comparisonMode == TypeComparisonMode.SignatureOnly || comparisonMode == TypeComparisonMode.SignatureOnlyLoose;
}
static bool AreEqual (GenericInstanceType a, GenericInstanceType b, TypeComparisonMode comparisonMode = TypeComparisonMode.Exact)
{
if (ReferenceEquals (a, b))
return true;
var aGenericArgumentsCount = a.GenericArguments.Count;
if (aGenericArgumentsCount != b.GenericArguments.Count)
return false;
if (!AreEqual (a.ElementType, b.ElementType, comparisonMode))
return false;
for (int i = 0; i < aGenericArgumentsCount; i++)
if (!AreEqual (a.GenericArguments[i], b.GenericArguments[i], comparisonMode))
return false;
return true;
}
public static int GetHashCodeFor (TypeReference obj)
{
// a very good prime number
const int hashCodeMultiplier = 486187739;
// prime numbers
const int genericInstanceTypeMultiplier = 31;
const int byReferenceMultiplier = 37;
const int pointerMultiplier = 41;
const int requiredModifierMultiplier = 43;
const int optionalModifierMultiplier = 47;
const int pinnedMultiplier = 53;
const int sentinelMultiplier = 59;
var metadataType = obj.MetadataType;
if (metadataType == MetadataType.GenericInstance) {
var genericInstanceType = (GenericInstanceType)obj;
var hashCode = GetHashCodeFor (genericInstanceType.ElementType) * hashCodeMultiplier + genericInstanceTypeMultiplier;
for (var i = 0; i < genericInstanceType.GenericArguments.Count; i++)
hashCode = hashCode * hashCodeMultiplier + GetHashCodeFor (genericInstanceType.GenericArguments[i]);
return hashCode;
}
if (metadataType == MetadataType.Array) {
var arrayType = (ArrayType)obj;
return GetHashCodeFor (arrayType.ElementType) * hashCodeMultiplier + arrayType.Rank.GetHashCode ();
}
if (metadataType == MetadataType.Var || metadataType == MetadataType.MVar) {
var genericParameter = (GenericParameter)obj;
var hashCode = genericParameter.Position.GetHashCode () * hashCodeMultiplier + ((int)metadataType).GetHashCode ();
var ownerTypeReference = genericParameter.Owner as TypeReference;
if (ownerTypeReference != null)
return hashCode * hashCodeMultiplier + GetHashCodeFor (ownerTypeReference);
var ownerMethodReference = genericParameter.Owner as MethodReference;
if (ownerMethodReference != null)
return hashCode * hashCodeMultiplier + MethodReferenceComparer.GetHashCodeFor (ownerMethodReference);
throw new InvalidOperationException ("Generic parameter encountered with invalid owner");
}
if (metadataType == MetadataType.ByReference) {
var byReferenceType = (ByReferenceType)obj;
return GetHashCodeFor (byReferenceType.ElementType) * hashCodeMultiplier * byReferenceMultiplier;
}
if (metadataType == MetadataType.Pointer) {
var pointerType = (PointerType)obj;
return GetHashCodeFor (pointerType.ElementType) * hashCodeMultiplier * pointerMultiplier;
}
if (metadataType == MetadataType.RequiredModifier) {
var requiredModifierType = (RequiredModifierType)obj;
var hashCode = GetHashCodeFor (requiredModifierType.ElementType) * requiredModifierMultiplier;
hashCode = hashCode * hashCodeMultiplier + GetHashCodeFor (requiredModifierType.ModifierType);
return hashCode;
}
if (metadataType == MetadataType.OptionalModifier) {
var optionalModifierType = (OptionalModifierType)obj;
var hashCode = GetHashCodeFor (optionalModifierType.ElementType) * optionalModifierMultiplier;
hashCode = hashCode * hashCodeMultiplier + GetHashCodeFor (optionalModifierType.ModifierType);
return hashCode;
}
if (metadataType == MetadataType.Pinned) {
var pinnedType = (PinnedType)obj;
return GetHashCodeFor (pinnedType.ElementType) * hashCodeMultiplier * pinnedMultiplier;
}
if (metadataType == MetadataType.Sentinel) {
var sentinelType = (SentinelType)obj;
return GetHashCodeFor (sentinelType.ElementType) * hashCodeMultiplier * sentinelMultiplier;
}
if (metadataType == MetadataType.FunctionPointer) {
throw new NotImplementedException ("We currently don't handle function pointer types.");
}
return obj.Namespace.GetHashCode () * hashCodeMultiplier + obj.FullName.GetHashCode ();
}
}
}
|
