public MethodXrefScanCache(string filePath)
{
myMapFile = MemoryMappedFile.CreateFromFile(filePath, FileMode.Open, null, 0, MemoryMappedFileAccess.Read);
var headerView = myMapFile.CreateViewAccessor(0, 0, MemoryMappedFileAccess.Read);
myAccessor = headerView;
headerView.Read(0, out Header);
if (Header.Magic != Magic)
{
myMapFile.Dispose();
throw new FileLoadException($"File magic mismatched for {filePath}; Expected {Magic:X}, got {Header.Magic:X}");
}
if (Header.Version != Version)
{
myMapFile.Dispose();
throw new FileLoadException($"File version mismatched for {filePath}; Expected {Version}, got {Header.Version}");
}
var offset = Marshal.SizeOf <FileHeader>();
unsafe
{
byte *pointersPointer = null;
myAccessor.SafeMemoryMappedViewHandle.AcquirePointer(ref pointersPointer);
myData = (MethodData *)(pointersPointer + offset);
}
}
private void ReleaseUnmanagedResources()
{
myAccessor.SafeMemoryMappedViewHandle.ReleasePointer();
unsafe
{
myData = null;
}
}
//static unsafe void Parse(byte* body, CORINFO_METHOD_INFO* info, ICorJitInfo* comp, out CORINFO_EH_CLAUSE[] ehs)
//{
// //Refer to SSCLI
// if ((*body & 0x3) == 0x2)
// {
// if (ver)
// {
// *((uint*)(info + 1) + 0) = 8; //maxstack
// *((uint*)(info + 1) + 1) = 0; //ehcount
// }
// else
// {
// *((ushort*)(info + 1) + 0) = 8;
// *((ushort*)(info + 1) + 1) = 0;
// }
// info->ILCode = body + 1;
// info->ILCodeSize = (uint)(*body >> 2);
// ehs = null;
// return;
// }
// else
// {
// ushort flags = *(ushort*)body;
// if (ver) //maxstack
// *((uint*)(info + 1) + 0) = *(ushort*)(body + 2);
// else
// *((ushort*)(info + 1) + 0) = *(ushort*)(body + 2);
// info->ILCodeSize = *(uint*)(body + 4);
// var localVarTok = *(uint*)(body + 8);
// if ((flags & 0x10) != 0)
// {
// if (ver) //options
// *((uint*)(info + 1) + 2) |= (uint)CorInfoOptions.OPT_INIT_LOCALS;
// else
// *((uint*)(info + 1) + 1) |= (ushort)CorInfoOptions.OPT_INIT_LOCALS;
// }
// info->ILCode = body + 12;
// if (localVarTok != 0)
// ParseLocalVars(info, comp, localVarTok);
// if ((flags & 0x8) != 0)
// {
// body = body + 12 + info->ILCodeSize;
// var list = new ArrayList();
// byte f;
// do
// {
// body = (byte*)(((uint)body + 3) & ~3);
// f = *body;
// uint count;
// bool isSmall = (f & 0x40) == 0;
// if (isSmall)
// count = *(body + 1) / 12u;
// else
// count = (*(uint*)body >> 8) / 24;
// body += 4;
// for (int i = 0; i < count; i++)
// {
// var clause = new CORINFO_EH_CLAUSE();
// clause.Flags = (CORINFO_EH_CLAUSE_FLAGS)(*body & 0x7);
// body += isSmall ? 2 : 4;
// clause.TryOffset = isSmall ? *(ushort*)body : *(uint*)body;
// body += isSmall ? 2 : 4;
// clause.TryLength = isSmall ? *(byte*)body : *(uint*)body;
// body += isSmall ? 1 : 4;
// clause.HandlerOffset = isSmall ? *(ushort*)body : *(uint*)body;
// body += isSmall ? 2 : 4;
// clause.HandlerLength = isSmall ? *(byte*)body : *(uint*)body;
// body += isSmall ? 1 : 4;
// clause.ClassTokenOrFilterOffset = *(uint*)body;
// body += 4;
// if ((clause.ClassTokenOrFilterOffset & 0xff000000) == 0x1b000000)
// {
// if (ver) //options
// *((uint*)(info + 1) + 2) |= (uint)CorInfoOptions.GENERICS_CTXT_KEEP_ALIVE;
// else
// *((uint*)(info + 1) + 1) |= (ushort)CorInfoOptions.GENERICS_CTXT_KEEP_ALIVE;
// }
// list.Add(clause);
// }
// }
// while ((f & 0x80) != 0);
// ehs = new CORINFO_EH_CLAUSE[list.Count];
// for (int i = 0; i < ehs.Length; i++)
// ehs[i] = (CORINFO_EH_CLAUSE)list[i];
// if (ver) //ehcount
// *((uint*)(info + 1) + 1) = (ushort)ehs.Length;
// else
// *((ushort*)(info + 1) + 1) = (ushort)ehs.Length;
// }
// else
// {
// ehs = null;
// if (ver) //ehcount
// *((uint*)(info + 1) + 1) = 0;
// else
// *((ushort*)(info + 1) + 1) = 0;
// }
// }
//}
static unsafe uint Interop(IntPtr self, ICorJitInfo *comp, CORINFO_METHOD_INFO *info, uint flags, byte **nativeEntry, uint *nativeSizeOfCode)
{
if (self == IntPtr.Zero)
{
return(0);
}
if (info != null &&
(ulong)info->ILCode > s &&
(ulong)info->ILCode < s + l &&
info->ILCodeSize == 0x11 &&
info->ILCode[0] == 0x21 &&
info->ILCode[9] == 0x20 &&
info->ILCode[14] == 0x26)
{
ulong num = *(ulong *)(info->ILCode + 1);
uint key = (uint)(num >> 32);
uint ptr = (uint)(num & 0xFFFFFFFF) ^ key;
uint len = ~*(uint *)(info->ILCode + 10) ^ key;
byte[] buff = new byte[len];
fixed(byte *arr = buff)
{
Marshal.Copy(data, (int)ptr, (IntPtr)arr, (int)len);
uint k = key * (uint)Mutation.Key4I;
for (uint i = 0; i < buff.Length; i++)
{
arr[i] ^= (byte)(k & 0xff);
k = (k * arr[i] + key) % 0xff;
}
MethodData *dat = (MethodData *)arr;
info->ILCodeSize = dat->ILCodeSize;
if (ver)
{
*((uint *)(info + 1) + 0) = dat->MaxStack;
*((uint *)(info + 1) + 1) = dat->EHCount;
*((uint *)(info + 1) + 2) = dat->Options & 0xff;
}
else
{
*((ushort *)(info + 1) + 0) = (ushort)dat->MaxStack;
*((ushort *)(info + 1) + 1) = (ushort)dat->EHCount;
*((uint *)(info + 1) + 1) = dat->Options & 0xff;
}
if (dat->LocalVars != 0)
{
ParseLocalVars(info, comp, dat->LocalVars);
}
CORINFO_EH_CLAUSE[] ehs;
byte *body = (byte *)(dat + 1);
if ((dat->Options >> 8) == 0)
{
info->ILCode = body;
body += info->ILCodeSize;
ehs = new CORINFO_EH_CLAUSE[dat->EHCount];
CORINFO_EH_CLAUSE *ehPtr = (CORINFO_EH_CLAUSE *)body;
for (int i = 0; i < dat->EHCount; i++)
{
ehs[i] = *ehPtr;
*ehPtr = new CORINFO_EH_CLAUSE();
ehPtr++;
}
}
else
{
ehs = new CORINFO_EH_CLAUSE[dat->EHCount];
CORINFO_EH_CLAUSE *ehPtr = (CORINFO_EH_CLAUSE *)body;
for (int i = 0; i < dat->EHCount; i++)
{
ehs[i] = *ehPtr;
*ehPtr = new CORINFO_EH_CLAUSE();
ehPtr++;
}
info->ILCode = (byte *)ehPtr;
}
*((ulong *)dat) = 0;
*((ulong *)dat + 1) = 0;
*((uint *)dat + 4) = 0;
var hook1 = CorMethodInfoHook.Hook(comp, info->ftn, ehs);
var hook2 = CorDynamicInfoHook.Hook(comp);
uint ret = originalDelegate(self, comp, info, flags, nativeEntry, nativeSizeOfCode);
hook2.Dispose();
hook1.Dispose();
return(ret);
}
}
else
{
return(originalDelegate(self, comp, info, flags, nativeEntry, nativeSizeOfCode));
}
}