internal ExceptionTableEntry64(PortableExecutableImage image, Location location, IMAGE_RUNTIME_FUNCTION_64 function) : base(image, location)
{
_unwindInfo = null;
StartAddress = function.StartAddress;
EndAddress = function.EndAddress;
UnwindInfoAddress = function.UnwindInfoAddress;
}
public async Task <ExceptionUnwindInfo> GetUnwindInfoAsync()
{
if (_unwindInfo == null && UnwindInfoAddress > 0)
{
var calc = Image.GetCalculator();
var stream = Image.GetStream();
try
{
var offset = calc.RVAToOffset(UnwindInfoAddress);
stream.Seek(offset.ToInt64(), SeekOrigin.Begin);
var versionFlags = await stream.ReadByteAsync().ConfigureAwait(false);
var sizeOfProlog = await stream.ReadByteAsync().ConfigureAwait(false);
var countOfCodes = await stream.ReadByteAsync().ConfigureAwait(false);
var frameRegisterOffset = await stream.ReadByteAsync().ConfigureAwait(false);
var codes = new List <ushort>();
for (var i = 0; i < countOfCodes; i++)
{
var code = await stream.ReadUInt16Async().ConfigureAwait(false);
codes.Add(code);
}
if (countOfCodes % 2 != 0)
{
await stream.SkipBytesAsync(sizeof(ushort)).ConfigureAwait(false);
}
var flags = GetFlags(versionFlags);
uint handlerAddress = 0;
ExceptionChainedUnwindInfo chainedInfo = null;
if ((flags & ExceptionUnwindInfoFlags.ExceptionHandler) == ExceptionUnwindInfoFlags.ExceptionHandler || (flags & ExceptionUnwindInfoFlags.UnwindHandler) == ExceptionUnwindInfoFlags.UnwindHandler)
{
handlerAddress = await stream.ReadUInt32Async().ConfigureAwait(false);
}
if ((flags & ExceptionUnwindInfoFlags.ChainHandler) == ExceptionUnwindInfoFlags.ChainHandler)
{
var chainedFunction = await stream.ReadStructAsync <IMAGE_RUNTIME_FUNCTION_64>();
if (chainedFunction.StartAddress != 0)
{
chainedInfo = new ExceptionChainedUnwindInfo(chainedFunction.StartAddress, chainedFunction.EndAddress, chainedFunction.UnwindInfoAddress);
}
}
_unwindInfo = new ExceptionUnwindInfo(Image, UnwindInfoAddress, versionFlags, sizeOfProlog, countOfCodes, frameRegisterOffset, codes.ToArray(), handlerAddress, chainedInfo);
}
catch (Exception ex)
{
throw new PortableExecutableImageException(Image, "Could not read exception unwind information from stream.", ex);
}
}
return(_unwindInfo);
}
