public void AddVTableHeader(VTableHeader header)
{
if (!header.Is32Bit && !header.Is64Bit)
{
throw new ArgumentException("VTable header must be marked either 32 bits or 64 bits.");
}
if (header.Is32Bit && header.Is64Bit)
{
throw new ArgumentException("VTable header cannot be 32 bits and 64 bits simultanuously.");
}
var rawTable = new byte[header.Table.Count * (header.Is32Bit ? sizeof(uint) : sizeof(ulong))];
for (int index = 0; index < header.Table.Count; index++)
{
var entry = header.Table[index];
var rawEntry = header.Is64Bit
? BitConverter.GetBytes((ulong)entry.MetadataToken.ToUInt32())
: BitConverter.GetBytes(entry.MetadataToken.ToUInt32());
Buffer.BlockCopy(rawEntry, 0, rawTable, index * rawEntry.Length, rawEntry.Length);
}
var tableSegment = new DataSegment(rawTable);
_entriesTable.Segments.Add(tableSegment);
_headerToTables[header] = tableSegment;
}
public void PersistentVTables()
{
var assembly = CreateTempAssembly();
var header = assembly.NetDirectory.MetadataHeader;
var importer = new ReferenceImporter(header.Image);
var type = new TypeDefinition(null, "SomeType", TypeAttributes.Public, importer.ImportType(typeof(object)));
for (int i = 0; i < 10; i++)
{
var method = new MethodDefinition("Method" + i, MethodAttributes.Public | MethodAttributes.Virtual,
new MethodSignature(header.Image.TypeSystem.Void));
method.MethodBody = new CilMethodBody(method)
{
Instructions = { CilInstruction.Create(CilOpCodes.Ret) }
};
type.Methods.Add(method);
}
header.Image.Assembly.Modules[0].TopLevelTypes.Add(type);
var mapping = header.UnlockMetadata();
var directory = new VTablesDirectory();
var vTableHeader = new VTableHeader()
{
Attributes = VTableAttributes.Is32Bit,
};
foreach (var method in type.Methods)
{
vTableHeader.Table.Add(header.GetStream <TableStream>().ResolveRow(mapping[method]));
}
directory.VTableHeaders.Add(vTableHeader);
assembly.NetDirectory.VTablesDirectory = directory;
using (var stream = new MemoryStream())
{
assembly.Write(new BinaryStreamWriter(stream), new CompactNetAssemblyBuilder(assembly));
assembly = WindowsAssembly.FromBytes(stream.ToArray());
directory = assembly.NetDirectory.VTablesDirectory;
Assert.NotNull(directory);
Assert.Equal(1, directory.VTableHeaders.Count);
Assert.Equal(type.Methods.Select(x => mapping[x]),
directory.VTableHeaders[0].Table.Select(x => x.MetadataToken));
}
}