public override ComputedInstanceFieldLayout ComputeInstanceLayout(DefType type, InstanceLayoutKind layoutKind)
{
if (!type.IsTemplateUniversal() && (layoutKind == InstanceLayoutKind.TypeOnly))
{
// Non universal generics can just use the template's layout
DefType template = (DefType)type.ComputeTemplate();
return _noMetadataFieldLayoutAlgorithm.ComputeInstanceLayout(template, InstanceLayoutKind.TypeOnly);
}
// Only needed for universal generics, or when looking up an offset for a field for a universal generic
LowLevelList<int> fieldOffsets;
int[] position = ComputeTypeSizeAndAlignment(type, FieldLoadState.Instance, out fieldOffsets);
int numInstanceFields = 0;
foreach (NativeLayoutFieldDesc field in type.NativeLayoutFields)
{
if (!field.IsStatic)
{
numInstanceFields++;
}
}
int byteCountAlignment = position[InstanceAlignmentEntry];
byteCountAlignment = type.Context.Target.GetObjectAlignment(byteCountAlignment);
ComputedInstanceFieldLayout layout = new ComputedInstanceFieldLayout()
{
Offsets = new FieldAndOffset[numInstanceFields],
ByteCountAlignment = byteCountAlignment,
ByteCountUnaligned = position[(int)NativeFormat.FieldStorage.Instance],
PackValue = 0 // TODO, as we add more metadata handling logic, find out if its necessary to use a meaningful value here
};
if (!type.IsValueType)
{
layout.FieldAlignment = type.Context.Target.PointerSize;
layout.FieldSize = type.Context.Target.PointerSize;
}
else
{
layout.FieldAlignment = position[InstanceAlignmentEntry];
layout.FieldSize = MemoryHelpers.AlignUp(position[(int)NativeFormat.FieldStorage.Instance], layout.FieldAlignment);
}
int curInstanceField = 0;
foreach (NativeLayoutFieldDesc field in type.NativeLayoutFields)
{
if (!field.IsStatic)
{
layout.Offsets[curInstanceField] = new FieldAndOffset(field, fieldOffsets[curInstanceField]);
curInstanceField++;
}
}
return layout;
}
public override ComputedStaticFieldLayout ComputeStaticFieldLayout(DefType type, StaticLayoutKind layoutKind)
{
if (!type.IsTemplateUniversal() && (layoutKind == StaticLayoutKind.StaticRegionSizes))
{
return ParseStaticRegionSizesFromNativeLayout(type);
}
LowLevelList<int> fieldOffsets;
int[] position = ComputeTypeSizeAndAlignment(type, FieldLoadState.Statics, out fieldOffsets);
int numStaticFields = 0;
foreach (NativeLayoutFieldDesc field in type.NativeLayoutFields)
{
if (field.IsStatic)
{
numStaticFields++;
}
}
ComputedStaticFieldLayout layout = new ComputedStaticFieldLayout();
layout.Offsets = new FieldAndOffset[numStaticFields];
if (numStaticFields > 0)
{
layout.GcStatics = new StaticsBlock() { Size = position[(int)NativeFormat.FieldStorage.GCStatic], LargestAlignment = DefType.MaximumAlignmentPossible };
layout.NonGcStatics = new StaticsBlock() { Size = position[(int)NativeFormat.FieldStorage.NonGCStatic], LargestAlignment = DefType.MaximumAlignmentPossible };
layout.ThreadStatics = new StaticsBlock() { Size = position[(int)NativeFormat.FieldStorage.TLSStatic], LargestAlignment = DefType.MaximumAlignmentPossible };
}
int curStaticField = 0;
foreach (NativeLayoutFieldDesc field in type.NativeLayoutFields)
{
if (field.IsStatic)
{
layout.Offsets[curStaticField] = new FieldAndOffset(field, fieldOffsets[curStaticField]);
curStaticField++;
}
}
return layout;
}
internal static void EnsureFieldLayoutLoadedForGenericType(DefType type)
{
if (type.NativeLayoutFields != null)
return;
if (!type.IsTemplateUniversal())
{
// We can hit this case where the template of type in question is not a universal canonical type.
// Example:
// BaseType<T> { ... }
// DerivedType<T, U> : BaseType<T> { ... }
// and an instantiation like DerivedType<string, int>. In that case, BaseType<string> will have a non-universal
// template type, and requires special handling to compute its size and field layout.
EnsureFieldLayoutLoadedForNonUniversalType(type);
}
else
{
TypeBuilderState state = type.GetOrCreateTypeBuilderState();
NativeParser typeInfoParser = state.GetParserForNativeLayoutInfo();
NativeParser fieldLayoutParser = typeInfoParser.GetParserForBagElementKind(BagElementKind.FieldLayout);
EnsureFieldLayoutLoadedForUniversalType(type, state.NativeLayoutInfo.LoadContext, fieldLayoutParser);
}
}
