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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;
using Debug = System.Diagnostics.Debug;
namespace ILCompiler.DependencyAnalysis
{
/// <summary>
/// Contains all GC static fields for a particular EEType.
/// Fields that have preinitialized data are pointer reloc pointing to frozen objects.
/// Other fields are initialized with 0.
/// We simply memcpy these over the GC static EEType object.
/// </summary>
public class GCStaticsPreInitDataNode : ObjectNode, ISymbolDefinitionNode
{
private MetadataType _type;
private List<PreInitFieldInfo> _sortedPreInitFields;
public GCStaticsPreInitDataNode(MetadataType type, List<PreInitFieldInfo> preInitFields)
{
Debug.Assert(!type.IsCanonicalSubtype(CanonicalFormKind.Specific));
_type = type;
// sort the PreInitFieldInfo to appear in increasing offset order for easier emitting
_sortedPreInitFields = new List<PreInitFieldInfo>(preInitFields);
_sortedPreInitFields.Sort(PreInitFieldInfo.FieldDescCompare);
}
protected override string GetName(NodeFactory factory) => GetMangledName(_type, factory.NameMangler);
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append(GetMangledName(_type, nameMangler));
}
public int Offset => 0;
public MetadataType Type => _type;
public static string GetMangledName(TypeDesc type, NameMangler nameMangler)
{
return nameMangler.NodeMangler.GCStatics(type) + "__PreInitData";
}
public override bool StaticDependenciesAreComputed => true;
public override ObjectNodeSection Section => ObjectNodeSection.ReadOnlyDataSection;
public override bool IsShareable => EETypeNode.IsTypeNodeShareable(_type);
public override ObjectData GetData(NodeFactory factory, bool relocsOnly = false)
{
// We only need this for CoreRT (at least for now) as we emit static field value directly in GCStaticsNode for N
Debug.Assert(factory.Target.Abi == TargetAbi.CoreRT);
return GetDataForPreInitDataField(
this, _type, _sortedPreInitFields,
factory.Target.PointerSize, // CoreRT static size calculation includes EEType - skip it
factory, relocsOnly);
}
public static ObjectData GetDataForPreInitDataField(
ISymbolDefinitionNode node,
MetadataType _type, List<PreInitFieldInfo> sortedPreInitFields,
int startOffset,
NodeFactory factory, bool relocsOnly = false)
{
ObjectDataBuilder builder = new ObjectDataBuilder(factory, relocsOnly);
builder.RequireInitialAlignment(_type.GCStaticFieldAlignment.AsInt);
int staticOffset = startOffset;
int staticOffsetEnd = _type.GCStaticFieldSize.AsInt;
int idx = 0;
while (staticOffset < staticOffsetEnd)
{
PreInitFieldInfo fieldInfo = idx < sortedPreInitFields.Count ? sortedPreInitFields[idx] : null;
int writeTo = staticOffsetEnd;
if (fieldInfo != null)
writeTo = fieldInfo.Field.Offset.AsInt;
// Emit the zero before the next preinitField
builder.EmitZeros(writeTo - staticOffset);
staticOffset = writeTo;
if (fieldInfo != null)
{
int count = builder.CountBytes;
if (fieldInfo.Field.FieldType.IsValueType)
{
// Emit inlined data for value types
fieldInfo.WriteData(ref builder, factory);
}
else
{
// Emit a pointer reloc to the frozen data for reference types
builder.EmitPointerReloc(factory.SerializedFrozenArray(fieldInfo));
}
staticOffset += builder.CountBytes - count;
idx++;
}
}
builder.AddSymbol(node);
return builder.ToObjectData();
}
public override int ClassCode => 1148300665;
public override int CompareToImpl(ISortableNode other, CompilerComparer comparer)
{
return comparer.Compare(_type, ((GCStaticsPreInitDataNode)other)._type);
}
}
}
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