private static ILayout GetPointerLayout(Type pointerType, LayoutManager layoutManager)
{
if (!typeof(Pointer).GetTypeInfo().IsAssignableFrom(pointerType))
{
return(null);
}
Type curPointerType = pointerType;
TypeInfo genericPointerTypeInfo = null;
while (curPointerType != typeof(Pointer))
{
TypeInfo curPointerTypeInfo = curPointerType.GetTypeInfo();
if (curPointerTypeInfo.IsGenericType && curPointerTypeInfo.GetGenericTypeDefinition() == typeof(Pointer <,>))
{
genericPointerTypeInfo = curPointerTypeInfo;
break;
}
curPointerType = curPointerTypeInfo.BaseType;
}
if (genericPointerTypeInfo == null)
{
throw new LayoutException("Pointer types must be derived from Pointer<,,>");
}
Type targetType = genericPointerTypeInfo.GetGenericArguments()[0];
Type storageType = genericPointerTypeInfo.GetGenericArguments()[1];
ILayout targetLayout = layoutManager.GetLayout(targetType);
ILayout storageLayout = layoutManager.GetLayout(storageType);
// Unfortunately the storageLayout.Read returns a boxed object that can't be
// casted to a ulong without first being unboxed. These three Pointer layout
// types are identical other than unboxing to a different type. Generics
// doesn't work, there is no constraint that ensures the type parameter defines
// a casting operator to ulong. Specifying a Func<object,ulong> parameter
// would work, but I opted to write each class separately so that we don't
// pay the cost of an extra delegate invocation for each pointer read. It
// may be premature optimization, but the complexity of it should be relatively
// constrained within this file at least.
if (storageLayout.Type == typeof(SizeT))
{
return(new SizeTPointerLayout(pointerType, storageLayout, targetLayout));
}
else if (storageLayout.Type == typeof(ulong))
{
return(new UInt64PointerLayout(pointerType, storageLayout, targetLayout));
}
else if (storageLayout.Type == typeof(uint))
{
return(new UInt32PointerLayout(pointerType, storageLayout, targetLayout));
}
else
{
throw new LayoutException("Pointer types must have a storage type of SizeT, ulong, or uint");
}
}
/// <summary>
/// Adds support for parsing the SizeT type
/// </summary>
/// <param name="size">The number of bytes that should be parsed for SizeT, either 4 or 8</param>
/// <param name="layouts">The layout manager that will hold the new layout</param>
/// <remarks>
/// SizeT reuses the existing parsing logic for either uint or ulong depending on size. The ILayoutManager
/// is expected to already have the relevant type's layout defined before calling this method.
/// </remarks>
public static LayoutManager AddSizeT(this LayoutManager layouts, int size)
{
if (size == 4)
{
layouts.AddLayout(new UInt32SizeTLayout(layouts.GetLayout <uint>()));
}
else if (size == 8)
{
layouts.AddLayout(new UInt64SizeTLayout(layouts.GetLayout <ulong>()));
}
else
{
throw new ArgumentException("Size must be 4 or 8");
}
return(layouts);
}
private static ILayout GetFieldLayout(FieldInfo fieldInfo, LayoutManager layoutManager)
{
ILayout fieldLayout = null;
Type fieldType = fieldInfo.FieldType;
if (fieldType.IsArray)
{
ArraySizeAttribute ca = (ArraySizeAttribute)fieldInfo.GetCustomAttributes(typeof(ArraySizeAttribute)).FirstOrDefault();
if (ca == null)
{
throw new LayoutException("Array typed fields must use an ArraySize attribute to indicate their size");
}
fieldLayout = layoutManager.GetArrayLayout(fieldType, ca.NumElements);
}
else
{
fieldLayout = layoutManager.GetLayout(fieldType);
}
if (!fieldLayout.IsFixedSize)
{
throw new LayoutException(fieldInfo.Name + " is not a fixed size field. Only fixed size fields are supported in structures");
}
return(fieldLayout);
}
private static ILayout GetEnumLayout(Type enumType, LayoutManager layoutManager)
{
if (!enumType.GetTypeInfo().IsEnum)
{
return(null);
}
Type elementType = enumType.GetTypeInfo().GetEnumUnderlyingType();
return(new EnumLayout(enumType, layoutManager.GetLayout(elementType)));
}
private static ILayout GetTStructLayout(Type tStructType, LayoutManager layoutManager, IEnumerable <string> enabledDefines, Type requiredBaseType)
{
if (!requiredBaseType.GetTypeInfo().IsAssignableFrom(tStructType))
{
return(null);
}
if (enabledDefines == null)
{
enabledDefines = new string[0];
}
TypeInfo typeInfo = tStructType.GetTypeInfo();
PackAttribute pack = typeInfo.GetCustomAttributes().Where(attr => attr is PackAttribute).Cast <PackAttribute>().SingleOrDefault();
FieldInfo[] reflectionFields = typeInfo.GetFields(BindingFlags.DeclaredOnly | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
reflectionFields = reflectionFields.OrderBy(f => f.MetadataToken).ToArray();
reflectionFields = reflectionFields.Where(f => !f.DeclaringType.Equals(typeof(TStruct))).ToArray();
reflectionFields = reflectionFields.Where(f => IsFieldIncludedInDefines(f, enabledDefines)).ToArray();
TField[] tFields = new TField[reflectionFields.Length];
uint alignCeiling = pack?.Pack ?? 8;
uint biggestAlignmentSoFar = 1;
uint curOffset = 0;
ILayout parentLayout = null;
Type baseType = tStructType.GetTypeInfo().BaseType;
if (!baseType.Equals(typeof(TStruct)))
{
// Treat base type as first member.
parentLayout = layoutManager.GetLayout(baseType);
uint align = Math.Min(parentLayout.NaturalAlignment, alignCeiling);
biggestAlignmentSoFar = Math.Max(biggestAlignmentSoFar, align);
curOffset += parentLayout.SizeAsBaseType;
}
// build the field list
for (int i = 0; i < reflectionFields.Length; i++)
{
ILayout fieldLayout = GetFieldLayout(reflectionFields[i], layoutManager);
uint fieldSize = fieldLayout.Size;
uint align = fieldLayout.NaturalAlignment;
align = Math.Min(align, alignCeiling);
biggestAlignmentSoFar = Math.Max(biggestAlignmentSoFar, align);
curOffset = AlignUp(curOffset, align);
tFields[i] = new TField(reflectionFields[i], fieldLayout, curOffset);
curOffset += fieldSize;
}
curOffset = AlignUp(curOffset, biggestAlignmentSoFar);
uint sizeAsBaseType = curOffset;
if (curOffset == 0)
{
curOffset = 1; // As with C++, zero-length struct not allowed (except as parent of another struct).
}
IField[] totalFields;
if (parentLayout != null)
{
totalFields = parentLayout.Fields.Concat(tFields).ToArray();
}
else
{
totalFields = tFields;
}
TLayout layout = new TLayout(tStructType, curOffset, biggestAlignmentSoFar, sizeAsBaseType, totalFields);
foreach (TField field in tFields)
{
field.DeclaringLayout = layout;
}
return(layout);
}
