private ComputedStaticFieldLayout ParseStaticRegionSizesFromNativeLayout(TypeDesc type)
{
LayoutInt nonGcDataSize = LayoutInt.Zero;
LayoutInt gcDataSize = LayoutInt.Zero;
LayoutInt threadDataSize = LayoutInt.Zero;
TypeBuilderState state = type.GetOrCreateTypeBuilderState();
NativeParser typeInfoParser = state.GetParserForNativeLayoutInfo();
BagElementKind kind;
while ((kind = typeInfoParser.GetBagElementKind()) != BagElementKind.End)
{
switch (kind)
{
case BagElementKind.NonGcStaticDataSize:
TypeLoaderLogger.WriteLine("Found BagElementKind.NonGcStaticDataSize");
// Use checked typecast to int to ensure there aren't any overflows/truncations (size value used in allocation of memory later)
nonGcDataSize = new LayoutInt(checked ((int)typeInfoParser.GetUnsigned()));
break;
case BagElementKind.GcStaticDataSize:
TypeLoaderLogger.WriteLine("Found BagElementKind.GcStaticDataSize");
// Use checked typecast to int to ensure there aren't any overflows/truncations (size value used in allocation of memory later)
gcDataSize = new LayoutInt(checked ((int)typeInfoParser.GetUnsigned()));
break;
case BagElementKind.ThreadStaticDataSize:
TypeLoaderLogger.WriteLine("Found BagElementKind.ThreadStaticDataSize");
// Use checked typecast to int to ensure there aren't any overflows/truncations (size value used in allocation of memory later)
threadDataSize = new LayoutInt(checked ((int)typeInfoParser.GetUnsigned()));
break;
default:
typeInfoParser.SkipInteger();
break;
}
}
ComputedStaticFieldLayout staticLayout = new ComputedStaticFieldLayout()
{
GcStatics = new StaticsBlock()
{
Size = gcDataSize, LargestAlignment = DefType.MaximumAlignmentPossible
},
NonGcStatics = new StaticsBlock()
{
Size = nonGcDataSize, LargestAlignment = DefType.MaximumAlignmentPossible
},
Offsets = null, // We're not computing field offsets here, so return null
ThreadStatics = new StaticsBlock()
{
Size = threadDataSize, LargestAlignment = DefType.MaximumAlignmentPossible
},
};
return(staticLayout);
}
/// <summary>
/// Prepare the StaticGCLayout/ThreadStaticGCLayout/GcStaticDesc/ThreadStaticDesc fields by
/// reading native layout or metadata as appropriate. This method should only be called for types which
/// are actually to be created.
/// </summary>
public void PrepareStaticGCLayout()
{
if (!_staticGCLayoutPrepared)
{
_staticGCLayoutPrepared = true;
DefType defType = TypeBeingBuilt as DefType;
if (defType == null)
{
// Array/pointer types do not have static fields
}
else if (defType.IsTemplateCanonical())
{
// Canonical templates get their layout directly from the NativeLayoutInfo.
// Parse it and pull that info out here.
NativeParser typeInfoParser = GetParserForNativeLayoutInfo();
BagElementKind kind;
while ((kind = typeInfoParser.GetBagElementKind()) != BagElementKind.End)
{
switch (kind)
{
case BagElementKind.GcStaticDesc:
GcStaticDesc = NativeLayoutInfo.LoadContext.GetGCStaticInfo(typeInfoParser.GetUnsigned());
break;
case BagElementKind.ThreadStaticDesc:
ThreadStaticDesc = NativeLayoutInfo.LoadContext.GetGCStaticInfo(typeInfoParser.GetUnsigned());
break;
default:
typeInfoParser.SkipInteger();
break;
}
}
}
else
{
// Compute GC layout boolean array from field information.
IEnumerable <FieldDesc> fields = GetFieldsForGCLayout();
LowLevelList <bool> threadStaticLayout = null;
LowLevelList <bool> gcStaticLayout = null;
foreach (FieldDesc field in fields)
{
if (!field.IsStatic)
{
continue;
}
if (field.IsLiteral)
{
continue;
}
LowLevelList <bool> gcLayoutInfo = null;
if (field.IsThreadStatic)
{
if (threadStaticLayout == null)
{
threadStaticLayout = new LowLevelList <bool>();
}
gcLayoutInfo = threadStaticLayout;
}
else if (field.HasGCStaticBase)
{
if (gcStaticLayout == null)
{
gcStaticLayout = new LowLevelList <bool>();
}
gcLayoutInfo = gcStaticLayout;
}
else
{
// Non-GC static no need to record information
continue;
}
TypeBuilder.GCLayout fieldGcLayout = GetFieldGCLayout(field.FieldType);
fieldGcLayout.WriteToBitfield(gcLayoutInfo, field.Offset);
}
if (gcStaticLayout != null && gcStaticLayout.Count > 0)
{
StaticGCLayout = gcStaticLayout;
}
if (threadStaticLayout != null && threadStaticLayout.Count > 0)
{
ThreadStaticGCLayout = threadStaticLayout;
}
}
}
}
