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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 Debug = System.Diagnostics.Debug;
namespace Internal.TypeSystem
{
partial struct GCPointerMap
{
/// <summary>
/// Computes the GC pointer map for the instance fields of <paramref name="type"/>.
/// </summary>
public static GCPointerMap FromInstanceLayout(DefType type)
{
Debug.Assert(type.ContainsGCPointers);
GCPointerMapBuilder builder = new GCPointerMapBuilder(type.InstanceByteCount.AsInt, type.Context.Target.PointerSize);
FromInstanceLayoutHelper(ref builder, type);
return builder.ToGCMap();
}
/// <summary>
/// Computes the GC pointer map of the GC static region of the type.
/// </summary>
public static GCPointerMap FromStaticLayout(DefType type)
{
GCPointerMapBuilder builder = new GCPointerMapBuilder(type.GCStaticFieldSize.AsInt, type.Context.Target.PointerSize);
foreach (FieldDesc field in type.GetFields())
{
if (!field.IsStatic || field.HasRva || field.IsLiteral
|| field.IsThreadStatic || !field.HasGCStaticBase)
continue;
TypeDesc fieldType = field.FieldType;
if (fieldType.IsGCPointer)
{
builder.MarkGCPointer(field.Offset.AsInt);
}
else
{
Debug.Assert(fieldType.IsValueType);
var fieldDefType = (DefType)fieldType;
if (fieldDefType.ContainsGCPointers)
{
GCPointerMapBuilder innerBuilder =
builder.GetInnerBuilder(field.Offset.AsInt, fieldDefType.InstanceByteCount.AsInt);
FromInstanceLayoutHelper(ref innerBuilder, fieldDefType);
}
}
}
Debug.Assert(builder.ToGCMap().Size * type.Context.Target.PointerSize >= type.GCStaticFieldSize.AsInt);
return builder.ToGCMap();
}
/// <summary>
/// Computes the GC pointer map of the thread static region of the type.
/// </summary>
public static GCPointerMap FromThreadStaticLayout(DefType type)
{
GCPointerMapBuilder builder = new GCPointerMapBuilder(type.ThreadGcStaticFieldSize.AsInt, type.Context.Target.PointerSize);
foreach (FieldDesc field in type.GetFields())
{
if (!field.IsStatic || field.HasRva || field.IsLiteral || !field.IsThreadStatic || !field.HasGCStaticBase)
continue;
TypeDesc fieldType = field.FieldType;
if (fieldType.IsGCPointer)
{
builder.MarkGCPointer(field.Offset.AsInt);
}
else if (fieldType.IsValueType)
{
var fieldDefType = (DefType)fieldType;
if (fieldDefType.ContainsGCPointers)
{
GCPointerMapBuilder innerBuilder =
builder.GetInnerBuilder(field.Offset.AsInt, fieldDefType.InstanceByteCount.AsInt);
FromInstanceLayoutHelper(ref innerBuilder, fieldDefType);
}
}
}
Debug.Assert(builder.ToGCMap().Size * type.Context.Target.PointerSize >= type.ThreadGcStaticFieldSize.AsInt);
return builder.ToGCMap();
}
private static void FromInstanceLayoutHelper(ref GCPointerMapBuilder builder, DefType type)
{
if (!type.IsValueType && type.HasBaseType)
{
DefType baseType = type.BaseType;
GCPointerMapBuilder baseLayoutBuilder = builder.GetInnerBuilder(0, baseType.InstanceByteCount.AsInt);
FromInstanceLayoutHelper(ref baseLayoutBuilder, baseType);
}
foreach (FieldDesc field in type.GetFields())
{
if (field.IsStatic)
continue;
TypeDesc fieldType = field.FieldType;
if (fieldType.IsGCPointer)
{
builder.MarkGCPointer(field.Offset.AsInt);
}
else if (fieldType.IsValueType)
{
var fieldDefType = (DefType)fieldType;
if (fieldDefType.ContainsGCPointers)
{
GCPointerMapBuilder innerBuilder =
builder.GetInnerBuilder(field.Offset.AsInt, fieldDefType.InstanceByteCount.AsInt);
FromInstanceLayoutHelper(ref innerBuilder, fieldDefType);
}
}
}
}
}
}
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