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
|
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Diagnostics;
using Internal.Text;
using Internal.TypeSystem;
using Internal.NativeFormat;
using FieldTableFlags = Internal.Runtime.FieldTableFlags;
namespace ILCompiler.DependencyAnalysis
{
/// <summary>
/// Represents a map between reflection metadata and native field offsets.
/// </summary>
internal sealed class ReflectionFieldMapNode : ObjectNode, ISymbolDefinitionNode
{
private ObjectAndOffsetSymbolNode _endSymbol;
private ExternalReferencesTableNode _externalReferences;
public ReflectionFieldMapNode(ExternalReferencesTableNode externalReferences)
{
_endSymbol = new ObjectAndOffsetSymbolNode(this, 0, "__field_to_offset_map_End", true);
_externalReferences = externalReferences;
}
public ISymbolNode EndSymbol => _endSymbol;
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append(nameMangler.CompilationUnitPrefix).Append("__field_to_offset_map");
}
public int Offset => 0;
public override bool IsShareable => false;
public override ObjectNodeSection Section => _externalReferences.Section;
public override bool StaticDependenciesAreComputed => true;
protected override string GetName(NodeFactory factory) => this.GetMangledName(factory.NameMangler);
public override ObjectData GetData(NodeFactory factory, bool relocsOnly = false)
{
// This node does not trigger generation of other nodes.
if (relocsOnly)
return new ObjectData(Array.Empty<byte>(), Array.Empty<Relocation>(), 1, new ISymbolDefinitionNode[] { this });
var writer = new NativeWriter();
var fieldMapHashTable = new VertexHashtable();
Section hashTableSection = writer.NewSection();
hashTableSection.Place(fieldMapHashTable);
foreach (var fieldMapping in factory.MetadataManager.GetFieldMapping(factory))
{
FieldDesc field = fieldMapping.Entity;
if (field.IsLiteral || field.HasRva)
continue;
FieldTableFlags flags;
if (field.IsThreadStatic)
{
flags = FieldTableFlags.ThreadStatic | FieldTableFlags.FieldOffsetEncodedDirectly;
}
else if (field.IsStatic)
{
flags = FieldTableFlags.Static;
if (field.HasGCStaticBase)
flags |= FieldTableFlags.IsGcSection;
if (field.OwningType.HasInstantiation)
flags |= FieldTableFlags.FieldOffsetEncodedDirectly;
}
else
{
flags = FieldTableFlags.Instance | FieldTableFlags.FieldOffsetEncodedDirectly;
}
if (fieldMapping.MetadataHandle != 0)
flags |= FieldTableFlags.HasMetadataHandle;
if (field.OwningType.IsCanonicalSubtype(CanonicalFormKind.Any))
flags |= FieldTableFlags.IsAnyCanonicalEntry;
if (field.OwningType.IsCanonicalSubtype(CanonicalFormKind.Universal))
flags |= FieldTableFlags.IsUniversalCanonicalEntry;
// Grammar of a hash table entry:
// Flags + DeclaringType + MdHandle or Name + Cookie or Ordinal or Offset
Vertex vertex = writer.GetUnsignedConstant((uint)flags);
uint declaringTypeId = _externalReferences.GetIndex(factory.NecessaryTypeSymbol(field.OwningType));
vertex = writer.GetTuple(vertex,
writer.GetUnsignedConstant(declaringTypeId));
if ((flags & FieldTableFlags.HasMetadataHandle) != 0)
{
// Only store the offset portion of the metadata handle to get better integer compression
vertex = writer.GetTuple(vertex,
writer.GetUnsignedConstant((uint)(fieldMapping.MetadataHandle & MetadataManager.MetadataOffsetMask)));
}
else
{
// No metadata handle means we need to store name
vertex = writer.GetTuple(vertex,
writer.GetStringConstant(field.Name));
}
if ((flags & FieldTableFlags.IsUniversalCanonicalEntry) != 0)
{
vertex = writer.GetTuple(vertex, writer.GetUnsignedConstant(checked((uint)field.GetFieldOrdinal())));
}
else
{
switch (flags & FieldTableFlags.StorageClass)
{
case FieldTableFlags.ThreadStatic:
if (factory.Target.Abi == TargetAbi.ProjectN)
{
if (!field.OwningType.IsCanonicalSubtype(CanonicalFormKind.Any))
{
ISymbolNode tlsOffsetForType = ((UtcNodeFactory)factory).TypeThreadStaticsOffsetSymbol((MetadataType)field.OwningType);
vertex = writer.GetTuple(vertex, writer.GetUnsignedConstant(_externalReferences.GetIndex(tlsOffsetForType)));
}
vertex = writer.GetTuple(vertex, writer.GetUnsignedConstant((uint)(field.Offset.AsInt)));
}
else
{
// TODO: CoreRT
continue;
}
break;
case FieldTableFlags.Static:
{
if (field.OwningType.HasInstantiation)
{
vertex = writer.GetTuple(vertex, writer.GetUnsignedConstant((uint)(field.Offset.AsInt)));
}
else
{
MetadataType metadataType = (MetadataType)field.OwningType;
ISymbolNode staticsNode = field.HasGCStaticBase ?
factory.TypeGCStaticsSymbol(metadataType) :
factory.TypeNonGCStaticsSymbol(metadataType);
if (!field.HasGCStaticBase || factory.Target.Abi == TargetAbi.ProjectN)
{
uint index = _externalReferences.GetIndex(staticsNode, field.Offset.AsInt);
vertex = writer.GetTuple(vertex, writer.GetUnsignedConstant(index));
}
else
{
Debug.Assert(field.HasGCStaticBase && factory.Target.Abi == TargetAbi.CoreRT);
uint index = _externalReferences.GetIndex(staticsNode);
vertex = writer.GetTuple(vertex, writer.GetUnsignedConstant(index));
vertex = writer.GetTuple(vertex, writer.GetUnsignedConstant((uint)(field.Offset.AsInt)));
}
}
}
break;
case FieldTableFlags.Instance:
vertex = writer.GetTuple(vertex, writer.GetUnsignedConstant((uint)field.Offset.AsInt));
break;
}
}
int hashCode = field.OwningType.ConvertToCanonForm(CanonicalFormKind.Specific).GetHashCode();
fieldMapHashTable.Append((uint)hashCode, hashTableSection.Place(vertex));
}
byte[] hashTableBytes = writer.Save();
_endSymbol.SetSymbolOffset(hashTableBytes.Length);
return new ObjectData(hashTableBytes, Array.Empty<Relocation>(), 1, new ISymbolDefinitionNode[] { this, _endSymbol });
}
protected internal override int Phase => (int)ObjectNodePhase.Ordered;
public override int ClassCode => (int)ObjectNodeOrder.ReflectionFieldMapNode;
}
}
|
