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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 Debug = System.Diagnostics.Debug;
namespace ILCompiler.DependencyAnalysis
{
/// <summary>
/// Represents a node with non-GC static data associated with a type, along
/// with it's class constructor context. The non-GC static data region shall be prefixed
/// with the class constructor context if the type has a class constructor that
/// needs to be triggered before the type members can be accessed.
/// </summary>
public class NonGCStaticsNode : ObjectNode, IExportableSymbolNode, ISortableSymbolNode, ISymbolNodeWithDebugInfo
{
private MetadataType _type;
private NodeFactory _factory;
private List<PreInitFieldInfo> _sortedPreInitFields;
public NonGCStaticsNode(MetadataType type, NodeFactory factory)
{
Debug.Assert(!type.IsCanonicalSubtype(CanonicalFormKind.Specific));
_type = type;
_factory = factory;
var preInitFieldInfos = PreInitFieldInfo.GetPreInitFieldInfos(_type, hasGCStaticBase: false);
if (preInitFieldInfos != null)
{
_sortedPreInitFields = new List<PreInitFieldInfo>(preInitFieldInfos);
_sortedPreInitFields.Sort(PreInitFieldInfo.FieldDescCompare);
}
}
protected override string GetName(NodeFactory factory) => this.GetMangledName(factory.NameMangler);
public override ObjectNodeSection Section => ObjectNodeSection.DataSection;
public static string GetMangledName(TypeDesc type, NameMangler nameMangler)
{
return nameMangler.NodeMangler.NonGCStatics(type);
}
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append(nameMangler.NodeMangler.NonGCStatics(_type));
}
int ISymbolNode.Offset => 0;
int ISymbolDefinitionNode.Offset
{
get
{
// Make sure the NonGCStatics symbol always points to the beginning of the data.
if (_factory.TypeSystemContext.HasLazyStaticConstructor(_type))
{
return GetClassConstructorContextStorageSize(_factory.Target, _type);
}
else
{
return 0;
}
}
}
public IDebugInfo DebugInfo => NullTypeIndexDebugInfo.Instance;
public override bool IsShareable => EETypeNode.IsTypeNodeShareable(_type);
public MetadataType Type => _type;
public virtual ExportForm GetExportForm(NodeFactory factory)
{
return factory.CompilationModuleGroup.GetExportTypeForm(Type);
}
private static int GetClassConstructorContextSize(TargetDetails target)
{
// TODO: Assert that StaticClassConstructionContext type has the expected size
// (need to make it a well known type?)
return target.PointerSize * 2;
}
public static int GetClassConstructorContextStorageSize(TargetDetails target, MetadataType type)
{
int alignmentRequired = Math.Max(type.NonGCStaticFieldAlignment.AsInt, GetClassConstructorContextAlignment(target));
return AlignmentHelper.AlignUp(GetClassConstructorContextSize(type.Context.Target), alignmentRequired);
}
private static int GetClassConstructorContextAlignment(TargetDetails target)
{
// TODO: Assert that StaticClassConstructionContext type has the expected alignment
// (need to make it a well known type?)
return target.PointerSize;
}
public override bool StaticDependenciesAreComputed => true;
protected override DependencyList ComputeNonRelocationBasedDependencies(NodeFactory factory)
{
DependencyList dependencyList = null;
if (factory.TypeSystemContext.HasEagerStaticConstructor(_type))
{
dependencyList = new DependencyList();
dependencyList.Add(factory.EagerCctorIndirection(_type.GetStaticConstructor()), "Eager .cctor");
}
EETypeNode.AddDependenciesForStaticsNode(factory, _type, ref dependencyList);
return dependencyList;
}
public override ObjectData GetData(NodeFactory factory, bool relocsOnly)
{
ObjectDataBuilder builder = new ObjectDataBuilder(factory, relocsOnly);
// If the type has a class constructor, its non-GC statics section is prefixed
// by System.Runtime.CompilerServices.StaticClassConstructionContext struct.
if (factory.TypeSystemContext.HasLazyStaticConstructor(_type))
{
int alignmentRequired = Math.Max(_type.NonGCStaticFieldAlignment.AsInt, GetClassConstructorContextAlignment(_type.Context.Target));
int classConstructorContextStorageSize = GetClassConstructorContextStorageSize(factory.Target, _type);
builder.RequireInitialAlignment(alignmentRequired);
Debug.Assert(classConstructorContextStorageSize >= GetClassConstructorContextSize(_type.Context.Target));
// Add padding before the context if alignment forces us to do so
builder.EmitZeros(classConstructorContextStorageSize - GetClassConstructorContextSize(_type.Context.Target));
// Emit the actual StaticClassConstructionContext
MethodDesc cctorMethod = _type.GetStaticConstructor();
builder.EmitPointerReloc(factory.ExactCallableAddress(cctorMethod));
builder.EmitZeroPointer();
}
else
{
builder.RequireInitialAlignment(_type.NonGCStaticFieldAlignment.AsInt);
}
if (_sortedPreInitFields != null)
{
int staticOffsetBegin = builder.CountBytes;
int staticOffsetEnd = builder.CountBytes + _type.NonGCStaticFieldSize.AsInt;
int staticOffset = staticOffsetBegin;
int idx = 0;
while (staticOffset < staticOffsetEnd)
{
int writeTo = staticOffsetEnd;
if (idx < _sortedPreInitFields.Count)
writeTo = staticOffsetBegin + _sortedPreInitFields[idx].Field.Offset.AsInt;
// Emit the zeros before the next preinitField
builder.EmitZeros(writeTo - staticOffset);
staticOffset = writeTo;
// Emit the data
if (idx < _sortedPreInitFields.Count)
{
_sortedPreInitFields[idx].WriteData(ref builder, factory);
idx++;
staticOffset = builder.CountBytes;
}
}
}
else
{
builder.EmitZeros(_type.NonGCStaticFieldSize.AsInt);
}
builder.AddSymbol(this);
return builder.ToObjectData();
}
public override int ClassCode => -1173104872;
public override int CompareToImpl(ISortableNode other, CompilerComparer comparer)
{
return comparer.Compare(_type, ((NonGCStaticsNode)other)._type);
}
}
}
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