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);
}
}
}
}
/// <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());
}
/// <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());
}