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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.Collections.Generic;
using Internal.Text;
using Internal.TypeSystem;
namespace ILCompiler.DependencyAnalysis
{
public class FrozenStringNode : EmbeddedObjectNode, ISymbolDefinitionNode
{
private string _data;
private int _syncBlockSize;
public FrozenStringNode(string data, TargetDetails target)
{
_data = data;
_syncBlockSize = target.PointerSize;
}
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append(nameMangler.CompilationUnitPrefix).Append("__Str_").Append(nameMangler.GetMangledStringName(_data));
}
public override bool StaticDependenciesAreComputed => true;
int ISymbolNode.Offset => 0;
int ISymbolDefinitionNode.Offset
{
get
{
// The frozen string symbol points at the EEType portion of the object, skipping over the sync block
return OffsetFromBeginningOfArray + _syncBlockSize;
}
}
private static IEETypeNode GetEETypeNode(NodeFactory factory)
{
DefType systemStringType = factory.TypeSystemContext.GetWellKnownType(WellKnownType.String);
//
// The GC requires a direct reference to frozen objects' EETypes. If System.String will be compiled into a separate
// binary, it must be cloned into this one.
//
IEETypeNode stringSymbol = factory.ConstructedTypeSymbol(systemStringType);
if (stringSymbol.RepresentsIndirectionCell)
{
return factory.ConstructedClonedTypeSymbol(systemStringType);
}
else
{
return stringSymbol;
}
}
public override void EncodeData(ref ObjectDataBuilder dataBuilder, NodeFactory factory, bool relocsOnly)
{
dataBuilder.EmitZeroPointer(); // Sync block
dataBuilder.EmitPointerReloc(GetEETypeNode(factory));
dataBuilder.EmitInt(_data.Length);
foreach (char c in _data)
{
dataBuilder.EmitShort((short)c);
}
// Null-terminate for friendliness with interop
dataBuilder.EmitShort(0);
}
protected override string GetName(NodeFactory factory) => this.GetMangledName(factory.NameMangler);
public override IEnumerable<DependencyListEntry> GetStaticDependencies(NodeFactory factory)
{
return new DependencyListEntry[]
{
new DependencyListEntry(GetEETypeNode(factory), "Frozen string literal EEType"),
};
}
protected override void OnMarked(NodeFactory factory)
{
factory.FrozenSegmentRegion.AddEmbeddedObject(this);
}
public override int ClassCode => -1733946122;
public override int CompareToImpl(ISortableNode other, CompilerComparer comparer)
{
return string.CompareOrdinal(_data, ((FrozenStringNode)other)._data);
}
}
}
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