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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.Text;
using Internal.Runtime;
using Internal.Text;
using Internal.TypeSystem;
using Debug = System.Diagnostics.Debug;
namespace ILCompiler.DependencyAnalysis
{
/// <summary>
/// Represents a subset of <see cref="EETypeNode"/> that is used to describe GC static field regions for
/// types. It only fills out enough pieces of the EEType structure so that the GC can operate on it. Runtime should
/// never see these.
/// </summary>
internal class GCStaticEETypeNode : ObjectNode, ISymbolDefinitionNode
{
private GCPointerMap _gcMap;
private TargetDetails _target;
public GCStaticEETypeNode(TargetDetails target, GCPointerMap gcMap)
{
_gcMap = gcMap;
_target = target;
}
protected override string GetName(NodeFactory factory) => this.GetMangledName(factory.NameMangler);
public override ObjectNodeSection Section
{
get
{
if (_target.IsWindows)
return ObjectNodeSection.ReadOnlyDataSection;
else
return ObjectNodeSection.DataSection;
}
}
public override bool StaticDependenciesAreComputed => true;
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append("__GCStaticEEType_").Append(_gcMap.ToString());
}
int ISymbolDefinitionNode.Offset
{
get
{
int numSeries = _gcMap.NumSeries;
return numSeries > 0 ? ((numSeries * 2) + 1) * _target.PointerSize : 0;
}
}
int ISymbolNode.Offset => 0;
public override bool IsShareable => true;
public override ObjectData GetData(NodeFactory factory, bool relocsOnly)
{
ObjectDataBuilder dataBuilder = new ObjectDataBuilder(factory, relocsOnly);
dataBuilder.RequireInitialPointerAlignment();
dataBuilder.AddSymbol(this);
// +1 for SyncBlock (in CoreRT static size already includes EEType)
Debug.Assert(factory.Target.Abi == TargetAbi.CoreRT);
int totalSize = (_gcMap.Size + 1) * _target.PointerSize;
// We only need to check for containsPointers because ThreadStatics are always allocated
// on the GC heap (no matter what "HasGCStaticBase" says).
// If that ever changes, we can assume "true" and switch this to an assert.
bool containsPointers = _gcMap.NumSeries > 0;
if (containsPointers)
{
GCDescEncoder.EncodeStandardGCDesc(ref dataBuilder, _gcMap, totalSize, 0);
}
Debug.Assert(dataBuilder.CountBytes == ((ISymbolDefinitionNode)this).Offset);
dataBuilder.EmitShort(0); // ComponentSize is always 0
short flags = 0;
if (containsPointers)
flags |= (short)EETypeFlags.HasPointersFlag;
dataBuilder.EmitShort(flags);
totalSize = Math.Max(totalSize, _target.PointerSize * 3); // minimum GC eetype size is 3 pointers
dataBuilder.EmitInt(totalSize);
// Related type: System.Object. This allows storing an instance of this type in an array of objects.
dataBuilder.EmitPointerReloc(factory.NecessaryTypeSymbol(factory.TypeSystemContext.GetWellKnownType(WellKnownType.Object)));
return dataBuilder.ToObjectData();
}
protected internal override int ClassCode => 1304929125;
protected internal override int CompareToImpl(SortableDependencyNode other, CompilerComparer comparer)
{
return _gcMap.CompareTo(((GCStaticEETypeNode)other)._gcMap);
}
}
}
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