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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 struct marshalling stub types generated into the image.
/// </summary>
internal sealed class StructMarshallingStubMapNode : ObjectNode, ISymbolDefinitionNode
{
private ObjectAndOffsetSymbolNode _endSymbol;
private ExternalReferencesTableNode _externalReferences;
public StructMarshallingStubMapNode(ExternalReferencesTableNode externalReferences)
{
_endSymbol = new ObjectAndOffsetSymbolNode(this, 0, "__struct_marshalling_stub_map_End", true);
_externalReferences = externalReferences;
}
public ISymbolDefinitionNode EndSymbol => _endSymbol;
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append(nameMangler.CompilationUnitPrefix).Append("__struct_marshalling_stub_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 structEntry in ((CompilerGeneratedInteropStubManager)factory.InteropStubManager).GetStructMarshallingTypes())
{
// the order of data written is as follows:
// 0. managed struct type
// 1. struct marshalling thunk
// 2. struct unmarshalling thunk
// 3. struct cleanup thunk
// 4. size
// 5. NumFields<< 1 | HasInvalidLayout
// 6 for each field
// a. name
// b. offset
var structType = structEntry.StructType;
var nativeType = structEntry.NativeStructType;
Vertex thunks= writer.GetTuple(
writer.GetUnsignedConstant(_externalReferences.GetIndex(factory.MethodEntrypoint(structEntry.MarshallingThunk))),
writer.GetUnsignedConstant(_externalReferences.GetIndex(factory.MethodEntrypoint(structEntry.UnmarshallingThunk))),
writer.GetUnsignedConstant(_externalReferences.GetIndex(factory.MethodEntrypoint(structEntry.CleanupThunk))));
uint size = (uint)nativeType.InstanceFieldSize.AsInt;
uint mask = (uint)(nativeType.Fields.Length << 1) | (uint)(nativeType.HasInvalidLayout ? 1 : 0);
Vertex data = writer.GetTuple(
thunks,
writer.GetUnsignedConstant(size),
writer.GetUnsignedConstant(mask)
);
for (int i = 0; i < nativeType.Fields.Length; i++)
{
data = writer.GetTuple(
data,
writer.GetStringConstant(nativeType.Fields[i].Name),
writer.GetUnsignedConstant((uint)nativeType.Fields[i].Offset.AsInt)
);
}
Vertex vertex = writer.GetTuple(
writer.GetUnsignedConstant(_externalReferences.GetIndex(factory.NecessaryTypeSymbol(structType))),
data
);
int hashCode = structType.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.StructMarshallingStubMapNode;
}
}
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