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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 System.Diagnostics;
using System.Threading;
using System.Text;
using ILCompiler.DependencyAnalysisFramework;
using Internal.TypeSystem;
using Internal.Text;
namespace ILCompiler.DependencyAnalysis
{
public class MrtProcessedImportAddressTableNode : EmbeddedDataContainerNode, IHasStartSymbol, ISortableSymbolNode, ISymbolDefinitionNode
{
private List<MrtImportNode> _importNodes = new List<MrtImportNode>();
private bool _nodeListComplete;
private int _pointerSize;
private EmbeddedObjectNode _pointerFromImportTablesTable;
public MrtProcessedImportAddressTableNode(string exportTableToImportSymbol, TypeSystemContext context) : base("_ImportTable_" + exportTableToImportSymbol, "_ImportTable_end_" + exportTableToImportSymbol)
{
ExportTableToImportSymbol = exportTableToImportSymbol;
_pointerSize = context.Target.PointerSize;
}
public readonly string ExportTableToImportSymbol;
protected override string GetName(NodeFactory factory) => $"Region {StartSymbol.GetMangledName(factory.NameMangler)}";
public override ObjectNodeSection Section => ObjectNodeSection.DataSection;
public override bool IsShareable => false;
public override bool StaticDependenciesAreComputed => true;
public void AddNode(MrtImportNode node)
{
Debug.Assert(!_nodeListComplete);
_importNodes.Add(node);
}
public void FinalizeOffsets()
{
if (_nodeListComplete)
return;
_nodeListComplete = true;
_importNodes.Sort((import1, import2) => import1.Ordinal - import2.Ordinal);
// Layout of importtable node
//
// Version Number - Always 1 (32bit int)
// Count of nodes (32bit int)
// Symbol that points to imported EAT (this is done via traditional linker import/export tables) (Pointer sized)
// Pointer sized indirection cell (1 per node, initial value is that of the index into the EAT)
int offset = 4 + 4 + _pointerSize;
foreach (MrtImportNode node in _importNodes)
{
node.InitializeOffsetFromBeginningOfArray(offset);
offset += _pointerSize;
}
}
public override ObjectData GetData(NodeFactory factory, bool relocsOnly)
{
ObjectDataBuilder builder = new ObjectDataBuilder(factory, relocsOnly);
builder.RequireInitialPointerAlignment();
builder.AddSymbol(this);
builder.AddSymbol(StartSymbol);
builder.EmitInt(1);
builder.EmitInt(_importNodes.Count);
builder.EmitPointerReloc(factory.ExternSymbol(ExportTableToImportSymbol));
if (!relocsOnly)
{
FinalizeOffsets();
foreach (MrtImportNode node in _importNodes)
{
Debug.Assert(((ISymbolDefinitionNode)node).Offset == builder.CountBytes);
builder.AddSymbol(node);
builder.EmitNaturalInt(node.Ordinal);
}
}
EndSymbol.SetSymbolOffset(builder.CountBytes);
builder.AddSymbol(EndSymbol);
ObjectData objData = builder.ToObjectData();
return objData;
}
protected override DependencyList ComputeNonRelocationBasedDependencies(NodeFactory factory)
{
DependencyList dependencies = new DependencyList();
dependencies.Add(StartSymbol, "StartSymbol");
dependencies.Add(EndSymbol, "EndSymbol");
lock(this)
{
if (_pointerFromImportTablesTable == null)
{
_pointerFromImportTablesTable = factory.ImportAddressTablesTable.NewNode(this);
}
}
dependencies.Add(_pointerFromImportTablesTable, "Pointer from ImportTablesTableNode");
return dependencies;
}
public override int ClassCode => -1145565068;
void ISymbolNode.AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append("__");
StartSymbol.AppendMangledName(nameMangler, sb);
}
int ISymbolNode.Offset => 0;
int ISymbolDefinitionNode.Offset => 0;
}
}
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