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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.Linq;
using System.Collections.Generic;
using Internal.Text;
using Internal.TypeSystem;
using Debug = System.Diagnostics.Debug;
namespace ILCompiler.DependencyAnalysis
{
public class MrtProcessedExportAddressTableNode : ObjectNode, IExportableSymbolNode, ISortableSymbolNode
{
private readonly HashSet<ISortableSymbolNode> _exportableSymbols = new HashSet<ISortableSymbolNode>();
private readonly string _symbolName;
private readonly NodeFactory _factory;
public MrtProcessedExportAddressTableNode(string symbolName, NodeFactory factory)
{
_symbolName = symbolName;
_factory = factory;
}
public event Func<uint, IExportableSymbolNode, uint> ReportExportedItem;
public event Func<uint> GetInitialExportOrdinal;
public void AddExportableSymbol(IExportableSymbolNode exportableSymbol)
{
if (exportableSymbol.GetExportForm(_factory) == ExportForm.ByOrdinal)
{
if (exportableSymbol is EETypeNode)
{
exportableSymbol = (IExportableSymbolNode)((EETypeNode)exportableSymbol).NodeForLinkage(_factory);
}
lock (_exportableSymbols)
{
_exportableSymbols.Add((ISortableSymbolNode)exportableSymbol);
}
}
}
protected override string GetName(NodeFactory factory) => this.GetMangledName(factory.NameMangler);
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append(_symbolName);
}
public int Offset => 0;
public virtual ExportForm GetExportForm(NodeFactory factory) => ExportForm.ByName;
public override bool StaticDependenciesAreComputed => true;
public override ObjectNodeSection Section => ObjectNodeSection.ReadOnlyDataSection;
public override bool IsShareable => true;
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 builder = new ObjectDataBuilder(factory, relocsOnly);
builder.RequireInitialPointerAlignment();
builder.AddSymbol(this);
//
// Entries in the export table need to be sorted by ordinals. When compiling using baseline TOC files, we reuse
// the ordinals from the baseline for sorting, otherwise we start assigning new sequential ordinals. Export entries that do
// not exist in the baseline will get new sequential ordinals, but for determinism, they are also pre-sorted using the
// CompilerComparer logic
//
ISortableSymbolNode[] symbolNodes = new ISortableSymbolNode[_exportableSymbols.Count];
_exportableSymbols.CopyTo(symbolNodes);
Array.Sort(symbolNodes, new CompilerComparer());
builder.EmitInt(1); // Export table version 1
builder.EmitInt(symbolNodes.Length); // Count of exported symbols in this table
uint index = GetInitialExportOrdinal == null ? 1 : GetInitialExportOrdinal();
Dictionary<uint, ISortableSymbolNode> symbolsOridnalMap = new Dictionary<uint, ISortableSymbolNode>();
foreach (ISortableSymbolNode symbol in symbolNodes)
{
uint indexUsed = ReportExportedItem.Invoke(index, (IExportableSymbolNode)symbol);
symbolsOridnalMap.Add(indexUsed, symbol);
index += (indexUsed == index ? (uint)1 : 0);
}
foreach (uint ordinal in symbolsOridnalMap.Keys.OrderBy(o => o))
{
builder.EmitReloc(symbolsOridnalMap[ordinal], RelocType.IMAGE_REL_BASED_REL32);
}
return builder.ToObjectData();
}
public override int ClassCode => 40423846;
public override int CompareToImpl(ISortableNode other, CompilerComparer comparer)
{
Debug.Assert(Object.ReferenceEquals(other, this));
return 0; // There should only ever be one of these per dependency graph
}
}
}
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