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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.Collections.Generic;
using Internal.Text;
using Internal.TypeSystem;
using Internal.Runtime;
using Debug = System.Diagnostics.Debug;
namespace ILCompiler.DependencyAnalysis
{
/// <summary>
/// Represents a node that points to various symbols and can be sequentially addressed.
/// </summary>
public sealed class ExternalReferencesTableNode : ObjectNode, ISymbolDefinitionNode
{
private readonly ObjectAndOffsetSymbolNode _endSymbol;
private readonly string _blobName;
private readonly NodeFactory _nodeFactory;
private Dictionary<SymbolAndDelta, uint> _insertedSymbolsDictionary = new Dictionary<SymbolAndDelta, uint>();
private List<SymbolAndDelta> _insertedSymbols = new List<SymbolAndDelta>();
public ExternalReferencesTableNode(string blobName, NodeFactory nodeFactory)
{
_blobName = blobName;
_endSymbol = new ObjectAndOffsetSymbolNode(this, 0, "__external_" + blobName + "_references_End", true);
_nodeFactory = nodeFactory;
}
public ISymbolDefinitionNode EndSymbol => _endSymbol;
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append(nameMangler.CompilationUnitPrefix).Append("__external_" + _blobName + "_references");
}
public int Offset => 0;
public override bool IsShareable => false;
/// <summary>
/// Adds a new entry to the table. Thread safety: not thread safe. Expected to be called at the final
/// object data emission phase from a single thread.
/// </summary>
public uint GetIndex(ISymbolNode symbol, int delta = 0)
{
#if DEBUG
if (_nodeFactory.MarkingComplete)
{
var node = symbol as ILCompiler.DependencyAnalysisFramework.DependencyNodeCore<NodeFactory>;
if (node != null)
Debug.Assert(node.Marked);
}
#endif
SymbolAndDelta key = new SymbolAndDelta(symbol, delta);
uint index;
if (!_insertedSymbolsDictionary.TryGetValue(key, out index))
{
index = (uint)_insertedSymbols.Count;
_insertedSymbolsDictionary[key] = index;
_insertedSymbols.Add(key);
}
return index;
}
public override ObjectNodeSection Section
{
get
{
if (_nodeFactory.Target.IsWindows)
return ObjectNodeSection.ReadOnlyDataSection;
else
return ObjectNodeSection.DataSection;
}
}
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 });
// Zero out the dictionary so that we AV if someone tries to insert after we're done.
_insertedSymbolsDictionary = null;
var builder = new ObjectDataBuilder(factory, relocsOnly);
foreach (SymbolAndDelta symbolAndDelta in _insertedSymbols)
{
if (factory.Target.Abi == TargetAbi.CoreRT)
{
// TODO: set low bit if the linkage of the symbol is IAT_PVALUE.
builder.EmitReloc(symbolAndDelta.Symbol, RelocType.IMAGE_REL_BASED_RELPTR32, symbolAndDelta.Delta);
}
else
{
Debug.Assert(factory.Target.Abi == TargetAbi.ProjectN);
int delta = symbolAndDelta.Delta;
if (symbolAndDelta.Symbol.RepresentsIndirectionCell)
{
delta = (int)((uint)delta | IndirectionConstants.RVAPointsToIndirection);
}
builder.EmitReloc(symbolAndDelta.Symbol, RelocType.IMAGE_REL_BASED_ADDR32NB, delta);
}
}
_endSymbol.SetSymbolOffset(builder.CountBytes);
builder.AddSymbol(this);
builder.AddSymbol(_endSymbol);
return builder.ToObjectData();
}
protected internal override int Phase => (int)ObjectNodePhase.Ordered;
public override int ClassCode => (int)ObjectNodeOrder.ExternalReferencesTableNode;
public override int CompareToImpl(ISortableNode other, CompilerComparer comparer)
{
return string.Compare(_blobName, ((ExternalReferencesTableNode)other)._blobName);
}
struct SymbolAndDelta : IEquatable<SymbolAndDelta>
{
public readonly ISymbolNode Symbol;
public readonly int Delta;
public SymbolAndDelta(ISymbolNode symbol, int delta)
{
Symbol = symbol;
Delta = delta;
}
public bool Equals(SymbolAndDelta other)
{
return Symbol == other.Symbol && Delta == other.Delta;
}
public override bool Equals(object obj)
{
return Equals((SymbolAndDelta)obj);
}
public override int GetHashCode()
{
return Symbol.GetHashCode();
}
}
}
}
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