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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 System.Diagnostics;
using Internal.Text;
using Internal.TypeSystem;
namespace ILCompiler.DependencyAnalysis
{
/// <summary>
/// Represents a native layout signature. A signature is a pair where the first item is a pointer
/// to the TypeManager that contains the native layout info blob of interest, and the second item
/// is an offset into that native layout info blob
/// </summary>
public class NativeLayoutSignatureNode : ObjectNode, ISymbolDefinitionNode
{
private TypeSystemEntity _identity;
private Utf8String _identityPrefix;
private NativeLayoutSavedVertexNode _nativeSignature;
public NativeLayoutSignatureNode(NativeLayoutSavedVertexNode nativeSignature, TypeSystemEntity identity, Utf8String identityPrefix)
{
_nativeSignature = nativeSignature;
_identity = identity;
_identityPrefix = identityPrefix;
}
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
Utf8String identityString;
if (_identity is MethodDesc)
{
identityString = nameMangler.GetMangledMethodName((MethodDesc)_identity);
}
else if (_identity is TypeDesc)
{
identityString = nameMangler.GetMangledTypeName((TypeDesc)_identity);
}
else if (_identity is FieldDesc)
{
identityString = nameMangler.GetMangledFieldName((FieldDesc)_identity);
}
else
{
Debug.Assert(false);
identityString = new Utf8String("unknown");
}
sb.Append(nameMangler.CompilationUnitPrefix).Append(_identityPrefix).Append(identityString);
}
public int Offset => 0;
protected override string GetName(NodeFactory factory) => this.GetMangledName(factory.NameMangler);
public override ObjectNodeSection Section => ObjectNodeSection.ReadOnlyDataSection;
public override bool IsShareable => false;
public override bool StaticDependenciesAreComputed => true;
protected override DependencyList ComputeNonRelocationBasedDependencies(NodeFactory factory)
{
DependencyList dependencies = new DependencyList();
dependencies.Add(new DependencyListEntry(_nativeSignature, "NativeLayoutSignatureNode target vertex"));
return dependencies;
}
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 });
// Ensure native layout is saved to get valid Vertex offsets
factory.MetadataManager.NativeLayoutInfo.SaveNativeLayoutInfoWriter(factory);
ObjectDataBuilder objData = new ObjectDataBuilder(factory, relocsOnly);
objData.RequireInitialPointerAlignment();
objData.AddSymbol(this);
objData.EmitPointerReloc(factory.TypeManagerIndirection);
objData.EmitNaturalInt(_nativeSignature.SavedVertex.VertexOffset);
return objData.ToObjectData();
}
public override int ClassCode => 1887049331;
public override int CompareToImpl(ISortableNode other, CompilerComparer comparer)
{
NativeLayoutSignatureNode otherSignature = (NativeLayoutSignatureNode)other;
if (_identity is MethodDesc)
{
if (otherSignature._identity is TypeDesc || otherSignature._identity is FieldDesc)
return -1;
return comparer.Compare((MethodDesc)_identity, (MethodDesc)((NativeLayoutSignatureNode)other)._identity);
}
else if (_identity is TypeDesc)
{
if (otherSignature._identity is MethodDesc)
return 1;
if (otherSignature._identity is FieldDesc)
return -1;
return comparer.Compare((TypeDesc)_identity, (TypeDesc)((NativeLayoutSignatureNode)other)._identity);
}
else if (_identity is FieldDesc)
{
if (otherSignature._identity is MethodDesc || otherSignature._identity is TypeDesc)
return 1;
return comparer.Compare((FieldDesc)_identity, (FieldDesc)((NativeLayoutSignatureNode)other)._identity);
}
else
{
throw new NotSupportedException("New type system entity needs a comparison");
}
}
}
}
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