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// 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 Internal.NativeFormat;
using Internal.Text;
using Internal.TypeSystem;
namespace ILCompiler.DependencyAnalysis
{
/// <summary>
/// Represents a map between EETypes and metadata records within the <see cref="MetadataNode"/>.
/// </summary>
internal sealed class TypeMetadataMapNode : ObjectNode, ISymbolDefinitionNode
{
private ObjectAndOffsetSymbolNode _endSymbol;
private ExternalReferencesTableNode _externalReferences;
public TypeMetadataMapNode(ExternalReferencesTableNode externalReferences)
{
_endSymbol = new ObjectAndOffsetSymbolNode(this, 0, "__type_to_metadata_map_End", true);
_externalReferences = externalReferences;
}
public ISymbolNode EndSymbol => _endSymbol;
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append(nameMangler.CompilationUnitPrefix).Append("__type_to_metadata_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 typeMapHashTable = new VertexHashtable();
Section hashTableSection = writer.NewSection();
hashTableSection.Place(typeMapHashTable);
foreach (var mappingEntry in factory.MetadataManager.GetTypeDefinitionMapping(factory))
{
// Types that don't have EETypes don't need mapping table entries because there's no risk of them
// not unifying to the same System.Type at runtime.
if (!factory.MetadataManager.TypeGeneratesEEType(mappingEntry.Entity) && !factory.CompilationModuleGroup.ShouldReferenceThroughImportTable(mappingEntry.Entity))
continue;
// Go with a necessary type symbol. It will be upgraded to a constructed one if a constructed was emitted.
IEETypeNode typeSymbol = factory.NecessaryTypeSymbol(mappingEntry.Entity);
Vertex vertex = writer.GetTuple(
writer.GetUnsignedConstant(_externalReferences.GetIndex(typeSymbol)),
writer.GetUnsignedConstant((uint)mappingEntry.MetadataHandle)
);
int hashCode = typeSymbol.Type.GetHashCode();
typeMapHashTable.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.TypeMetadataMapNode;
}
}
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