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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 hash table of resources within the resource blob in the image.
/// </summary>
internal class ResourceIndexNode : ObjectNode, ISymbolDefinitionNode
{
private ResourceDataNode _resourceDataNode;
public ResourceIndexNode(ResourceDataNode resourceDataNode)
{
_resourceDataNode = resourceDataNode;
_endSymbol = new ObjectAndOffsetSymbolNode(this, 0, "__embedded_resourceindex_End", true);
}
private ObjectAndOffsetSymbolNode _endSymbol;
public ISymbolDefinitionNode EndSymbol => _endSymbol;
public override bool IsShareable => false;
public override ObjectNodeSection Section => ObjectNodeSection.ReadOnlyDataSection;
public override bool StaticDependenciesAreComputed => true;
public int Offset => 0;
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append(nameMangler.CompilationUnitPrefix).Append("__embedded_resourceindex");
}
protected override string GetName(NodeFactory factory) => this.GetMangledName(factory.NameMangler);
public override ObjectData GetData(NodeFactory factory, bool relocsOnly = false)
{
// This node has no relocations.
if (relocsOnly)
return new ObjectData(Array.Empty<byte>(), Array.Empty<Relocation>(), 1, new ISymbolDefinitionNode[] { this });
byte[] blob = GenerateIndexBlob(factory);
return new ObjectData(
blob,
Array.Empty<Relocation>(),
1,
new ISymbolDefinitionNode[]
{
this,
EndSymbol
});
}
/// <summary>
/// Builds a native hashtable containing data about each manifest resource
/// </summary>
/// <returns></returns>
private byte[] GenerateIndexBlob(NodeFactory factory)
{
NativeWriter nativeWriter = new NativeWriter();
Section indexHashtableSection = nativeWriter.NewSection();
VertexHashtable indexHashtable = new VertexHashtable();
indexHashtableSection.Place(indexHashtable);
// Build a table with a tuple of Assembly Full Name, Resource Name, Offset within the resource data blob, Length
// for each resource.
// This generates a hashtable for the convenience of managed code since there's
// a reader for VertexHashtable, but not for VertexSequence.
foreach (ResourceIndexData indexData in _resourceDataNode.GetOrCreateIndexData(factory))
{
Vertex asmName = nativeWriter.GetStringConstant(indexData.AssemblyName);
Vertex resourceName = nativeWriter.GetStringConstant(indexData.ResourceName);
Vertex offsetVertex = nativeWriter.GetUnsignedConstant((uint)indexData.NativeOffset);
Vertex lengthVertex = nativeWriter.GetUnsignedConstant((uint)indexData.Length);
Vertex indexVertex = nativeWriter.GetTuple(asmName, resourceName);
indexVertex = nativeWriter.GetTuple(indexVertex, offsetVertex);
indexVertex = nativeWriter.GetTuple(indexVertex, lengthVertex);
int hashCode = TypeHashingAlgorithms.ComputeNameHashCode(indexData.AssemblyName);
indexHashtable.Append((uint)hashCode, indexHashtableSection.Place(indexVertex));
}
byte[] blob = nativeWriter.Save();
_endSymbol.SetSymbolOffset(blob.Length);
return blob;
}
protected internal override int Phase => (int)ObjectNodePhase.Ordered;
public override int ClassCode => (int)ObjectNodeOrder.ResourceIndexNode;
}
}
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