private static IEnumerable <CodeInstruction> UnhollowerTranspiler(MethodBase method, IEnumerable <CodeInstruction> instructionsIn)
{
List <CodeInstruction> instructions = new List <CodeInstruction>(instructionsIn);
PatchInfo patchInfo = HarmonySharedState.GetPatchInfo(method);
IntPtr copiedMethodInfo = patchInfo.copiedMethodInfoPointer;
bool found = false;
int replaceIdx = 0;
int replaceCount = 0;
for (int i = instructions.Count - 2; i >= 0; --i)
{
if (instructions[i].opcode != OpCodes.Ldsfld)
{
continue;
}
found = true;
CodeInstruction next = instructions[i + 1];
if (next.opcode == OpCodes.Call && ((MethodInfo)next.operand).Name == "il2cpp_object_get_virtual_method")
{
// Virtual method: Replace the sequence
// - ldarg.0
// - call native int[UnhollowerBaseLib] UnhollowerBaseLib.IL2CPP::Il2CppObjectBaseToPtr(class [UnhollowerBaseLib] UnhollowerBaseLib.Il2CppObjectBase)
// - ldsfld native int SomeClass::NativeMethodInfoPtr_Etc
// - call native int[UnhollowerBaseLib] UnhollowerBaseLib.IL2CPP::il2cpp_object_get_virtual_method(native int, native int)
replaceIdx = i - 2;
replaceCount = 4;
}
else
{
// Everything else: Just replace the static load
replaceIdx = i;
replaceCount = 1;
}
break;
}
if (!found)
{
MelonLogger.Error("Harmony transpiler could not rewrite Unhollower method. Expect a stack overflow.");
return(instructions);
}
CodeInstruction[] replacement =
{
new CodeInstruction(OpCodes.Ldc_I8, copiedMethodInfo.ToInt64()),
new CodeInstruction(OpCodes.Conv_I)
};
instructions.RemoveRange(replaceIdx, replaceCount);
instructions.InsertRange(replaceIdx, replacement);
return(instructions);
}
public static void AddTranspiler(PatchInfo patchInfo, string owner, HarmonyMethod info)
{
if (info == null || info.method == null) return;
var priority = info.prioritiy == -1 ? Priority.Normal : info.prioritiy;
var before = info.before ?? new string[0];
var after = info.after ?? new string[0];
patchInfo.AddTranspiler(info.method, owner, priority, before, after);
}
public static byte[] Serialize(this PatchInfo patchInfo)
{
byte[] buffer;
using (var memoryStream = new MemoryStream())
{
new BinaryFormatter().Serialize(memoryStream, patchInfo);
buffer = memoryStream.GetBuffer();
}
return(buffer);
}
public static byte[] Serialize(this PatchInfo patchInfo)
{
#pragma warning disable XS0001
using (var streamMemory = new MemoryStream())
{
var formatter = new BinaryFormatter();
formatter.Serialize(streamMemory, patchInfo);
return(streamMemory.GetBuffer());
}
#pragma warning restore XS0001
}
internal static PatchInfo GetPatchInfo(MethodBase method)
{
lock (patchInfos)
{
if (!patchInfos.TryGetValue(method, out var info))
{
patchInfos[method] = info = new PatchInfo();
}
return(info);
}
}
public static void AddPostfix(PatchInfo patchInfo, string owner, HarmonyMethod info)
{
if (info?.method == null)
{
return;
}
var priority = info.prioritiy == -1 ? 400 : info.prioritiy;
var before = info.before ?? new string[0];
var after = info.after ?? new string[0];
patchInfo.AddPostfix(info.method, owner, priority, before, after);
}
public static DynamicMethod UpdateWrapper(MethodBase original, PatchInfo patchInfo, string instanceID)
{
var sortedPrefixes = GetSortedPatchMethods(original, patchInfo.prefixes);
var sortedPostfixes = GetSortedPatchMethods(original, patchInfo.postfixes);
var sortedTranspilers = GetSortedPatchMethods(original, patchInfo.transpilers);
bool isIl2Cpp = UnhollowerSupport.IsGeneratedAssemblyType(original.DeclaringType);
if (isIl2Cpp)
{
if (sortedTranspilers.Count > 0)
{
throw new NotSupportedException("IL2CPP patches cannot use transpilers (got " + sortedTranspilers.Count + ")");
}
if (patchInfo.copiedMethodInfoPointer == IntPtr.Zero)
{
IntPtr origMethodPtr = UnhollowerSupport.MethodBaseToIl2CppMethodInfoPointer(original);
patchInfo.copiedMethodInfoPointer = CopyMethodInfoStruct(origMethodPtr);
HarmonySharedState.UpdatePatchInfo(original, patchInfo);
}
sortedTranspilers.Add(AccessTools.DeclaredMethod(typeof(PatchFunctions), "UnhollowerTranspiler"));
}
var replacement = MethodPatcher.CreatePatchedMethod(original, instanceID, sortedPrefixes, sortedPostfixes, sortedTranspilers);
if (replacement == null)
{
throw new MissingMethodException("Cannot create dynamic replacement for " + original.FullDescription());
}
if (isIl2Cpp)
{
DynamicMethod il2CppShim = CreateIl2CppShim(replacement, original);
InstallIl2CppPatch(patchInfo, il2CppShim);
PatchTools.RememberObject(original, new PotatoTuple {
First = replacement, Second = il2CppShim
});
}
else
{
var errorString = Memory.DetourMethod(original, replacement);
if (errorString != null)
{
throw new FormatException("Method " + original.FullDescription() + " cannot be patched. Reason: " + errorString);
}
PatchTools.RememberObject(original, replacement); // no gc for new value + release old value to gc
}
return(replacement);
}
private static void InstallIl2CppPatch(PatchInfo patchInfo, DynamicMethod il2CppShim)
{
IntPtr methodInfoPtr = patchInfo.copiedMethodInfoPointer;
IntPtr oldDetourPtr = patchInfo.methodDetourPointer;
IntPtr newDetourPtr = il2CppShim.MethodHandle.GetFunctionPointer();
if (oldDetourPtr != IntPtr.Zero) {
Imports.Unhook(methodInfoPtr, oldDetourPtr);
}
Imports.Hook(methodInfoPtr, newDetourPtr);
patchInfo.methodDetourPointer = newDetourPtr;
}
/// <summary>Adds a postfix</summary>
/// <param name="patchInfo">The patch info</param>
/// <param name="owner">The owner (Harmony ID)</param>
/// <param name="info">The annotation info</param>
///
internal static void AddPostfix(PatchInfo patchInfo, string owner, HarmonyMethod info)
{
if (info == null || info.method == null)
{
return;
}
var priority = info.priority == -1 ? Priority.Normal : info.priority;
var before = info.before ?? new string[0];
var after = info.after ?? new string[0];
patchInfo.AddPostfix(info.method, owner, priority, before, after);
}
private static void InstallIl2CppPatch(PatchInfo patchInfo, DynamicMethod il2CppShim)
{
IntPtr methodInfoPtr = patchInfo.copiedMethodInfoPointer;
IntPtr oldDetourPtr = patchInfo.methodDetourPointer;
IntPtr newDetourPtr = il2CppShim.MethodHandle.GetFunctionPointer();
if (oldDetourPtr != IntPtr.Zero)
{
MelonUtils.NativeHookDetach(methodInfoPtr, oldDetourPtr);
}
MelonUtils.NativeHookAttach(methodInfoPtr, newDetourPtr);
patchInfo.methodDetourPointer = newDetourPtr;
}
public static void AddInfix(PatchInfo patchInfo, string owner, HarmonyMethod info)
{
if (info == null || info.method == null)
{
return;
}
var priority = info.prioritiy == -1 ? Priority.Normal : info.prioritiy;
var before = info.before ?? new string[0];
var after = info.after ?? new string[0];
var patch = new Patch(info.method, patchInfo.processors.Count() + 1, owner, priority, before, after);
patchInfo.processors.Add(patch);
}
public void Patch()
{
lock (locker)
{
var patchInfo = HarmonySharedState.GetPatchInfo(original);
if (patchInfo == null)
{
patchInfo = new PatchInfo();
}
PatchFunctions.AddPrefix(patchInfo, instance.Id, prefix);
PatchFunctions.AddPostfix(patchInfo, instance.Id, postfix);
PatchFunctions.AddInfix(patchInfo, instance.Id, infix);
PatchFunctions.UpdateWrapper(original, patchInfo);
HarmonySharedState.UpdatePatchInfo(original, patchInfo);
}
}
public List <DynamicMethod> Patch()
{
lock (locker)
{
var dynamicMethods = new List <DynamicMethod>();
foreach (var original in originals)
{
if (original == null)
{
throw new NullReferenceException("original");
}
if ((original.DeclaringType.Assembly.GetCustomAttributes(typeof(HarmonyShield), false).Count() > 0) ||
(original.DeclaringType.GetCustomAttributes(typeof(HarmonyShield), false).Count() > 0) ||
(original.GetCustomAttributes(typeof(HarmonyShield), false).Count() > 0))
{
continue;
}
if (MelonDebug.IsEnabled() && UnhollowerSupport.IsGeneratedAssemblyType(original.DeclaringType))
{
WarnIfTargetMethodInlined(original);
}
var individualPrepareResult = RunMethod <HarmonyPrepare, bool>(true, original);
if (individualPrepareResult)
{
var patchInfo = HarmonySharedState.GetPatchInfo(original);
if (patchInfo == null)
{
patchInfo = new PatchInfo();
}
PatchFunctions.AddPrefix(patchInfo, instance.Id, prefix);
PatchFunctions.AddPostfix(patchInfo, instance.Id, postfix);
PatchFunctions.AddTranspiler(patchInfo, instance.Id, transpiler);
dynamicMethods.Add(PatchFunctions.UpdateWrapper(original, patchInfo, instance.Id));
HarmonySharedState.UpdatePatchInfo(original, patchInfo);
RunMethod <HarmonyCleanup>(original);
}
}
return(dynamicMethods);
}
}
public void Unpatch(MethodInfo patch)
{
lock (locker)
{
foreach (var original in originals)
{
var patchInfo = HarmonySharedState.GetPatchInfo(original);
if (patchInfo == null)
{
patchInfo = new PatchInfo();
}
PatchFunctions.RemovePatch(patchInfo, patch);
PatchHandler.Get(original).Apply();
}
}
}
public void Patch()
{
lock (locker)
{
var patchInfo = HarmonySharedState.GetPatchInfo(original);
if (patchInfo == null)
{
patchInfo = new PatchInfo();
}
PatchFunctions.AddPrefix(patchInfo, instance.Id, prefix);
PatchFunctions.AddPostfix(patchInfo, instance.Id, postfix);
PatchFunctions.AddTranspiler(patchInfo, instance.Id, transpiler);
PatchHandler.Get(original).Apply();
}
}
public static DynamicMethod UpdateWrapper(MethodBase original, PatchInfo patchInfo, string instanceID)
{
var sortedPrefixes = GetSortedPatchMethods(original, patchInfo.prefixes);
var sortedPostfixes = GetSortedPatchMethods(original, patchInfo.postfixes);
var sortedTranspilers = GetSortedPatchMethods(original, patchInfo.transpilers);
var replacement = MethodPatcher.CreatePatchedMethod(original, instanceID, sortedPrefixes, sortedPostfixes, sortedTranspilers);
if (replacement == null)
{
throw new MissingMethodException("Cannot create dynamic replacement for " + original.FullDescription());
}
var errorString = Memory.DetourMethod(original, replacement);
if (errorString != null)
{
throw new FormatException("Method " + original.FullDescription() + " cannot be patched. Reason: " + errorString);
}
if (UnhollowerSupport.IsGeneratedAssemblyType(original.DeclaringType))
{
var il2CppShim = CreateIl2CppShim(replacement, original);
var origMethodPtr = UnhollowerSupport.MethodBaseToIntPtr(original);
var oldDetourPtr = patchInfo.methodDetourPointer;
var newDetourPtr = il2CppShim.MethodHandle.GetFunctionPointer();
if (oldDetourPtr != IntPtr.Zero)
{
Imports.Unhook(origMethodPtr, oldDetourPtr);
}
Imports.Hook(origMethodPtr, newDetourPtr);
patchInfo.methodDetourPointer = newDetourPtr;
PatchTools.RememberObject(original, new PotatoTuple {
First = replacement, Second = il2CppShim
});
}
else
{
PatchTools.RememberObject(original, replacement); // no gc for new value + release old value to gc
}
return(replacement);
}
public void Unpatch(MethodInfo patch)
{
lock (locker)
{
foreach (var original in originals)
{
var patchInfo = HarmonySharedState.GetPatchInfo(original);
if (patchInfo == null)
{
patchInfo = new PatchInfo();
}
PatchFunctions.RemovePatch(patchInfo, patch);
PatchFunctions.UpdateWrapper(original, patchInfo, instance.Id);
HarmonySharedState.UpdatePatchInfo(original, patchInfo);
}
}
}
public static void UpdateWrapper(MethodBase original, PatchInfo patchInfo)
{
var sortedPrefixes = GetSortedPatchMethods(original, patchInfo.prefixes);
var sortedPostfixes = GetSortedPatchMethods(original, patchInfo.postfixes);
var sortedTranspilers = GetSortedPatchMethods(original, patchInfo.transpilers);
var originalCodeStart = Memory.GetMethodStart(original);
// If we're overwriting an old patch, restore the original 12 (or 6) bytes of the method beforehand
object oldHandle;
if (PatchTools.RecallObject(original, out oldHandle))
{
var oldPatchHandle = (PatchHandle)oldHandle;
Memory.WriteBytes(originalCodeStart, oldPatchHandle.OverwrittenCode);
}
if (patchInfo.postfixes.Length + patchInfo.prefixes.Length + patchInfo.transpilers.Length == 0)
{
// No patches, can just leave the original method intact
PatchTools.ForgetObject(originalCodeStart);
return;
}
var replacement = MethodPatcher.CreatePatchedMethod(original, sortedPrefixes, sortedPostfixes, sortedTranspilers);
if (replacement == null)
{
throw new MissingMethodException("Cannot create dynamic replacement for " + original);
}
var patchCodeStart = Memory.GetMethodStart(replacement);
// This part effectively corrupts the original compiled method, so we should prepare to restore the overwritten part later
// (It doesn't look like it breaks something, but... better safe than sorry?)
var oldBytes = new byte[(IntPtr.Size == sizeof(long)) ? 12 : 6];
Marshal.Copy((IntPtr)originalCodeStart, oldBytes, 0, oldBytes.Length);
// Store code being overwritten by the jump for the restoration
PatchTools.RememberObject(original, new PatchHandle {
PatchedMethod = replacement, OverwrittenCode = oldBytes
});
Memory.WriteJump(originalCodeStart, patchCodeStart);
}
public static void UpdateWrapper(MethodBase original, PatchInfo patchInfo)
{
var sortedPrefixes = GetSortedPatchMethods(original, patchInfo.prefixes);
var sortedPostfixes = GetSortedPatchMethods(original, patchInfo.postfixes);
var sortedProcessors = GetSortedProcessors(original, patchInfo.processors);
var replacement = MethodPatcher.CreatePatchedMethod(original, sortedPrefixes, sortedPostfixes, sortedProcessors);
if (replacement == null)
{
throw new MissingMethodException("Cannot create dynamic replacement for " + original);
}
var originalCodeStart = Memory.GetMethodStart(original);
var patchCodeStart = Memory.GetMethodStart(replacement);
Memory.WriteJump(originalCodeStart, patchCodeStart);
PatchTools.RememberObject(original, replacement); // no gc for new value + release old value to gc
}
public static void UpdateWrapper(MethodBase original, PatchInfo patchInfo, PatchFlags flags)
{
var sortedPrefixes = GetSortedPatchMethods(original, patchInfo.prefixes);
var sortedPostfixes = GetSortedPatchMethods(original, patchInfo.postfixes);
var sortedTranspilers = GetSortedPatchMethods(original, patchInfo.transpilers).Select(m => TranspilerImpl.From(m)).ToList();
var replacement = MethodPatcher.CreatePatchedMethod(original, sortedPrefixes, sortedPostfixes, sortedTranspilers, flags);
if (replacement == null)
{
throw new MissingMethodException("Cannot create dynamic replacement for " + original);
}
patchInfo.patchdata.orgaddress = Memory.GetMethodStart(original);
patchInfo.patchdata.jmpaddress = Memory.GetMethodStart(replacement);
Memory.WriteJump(patchInfo.patchdata.orgaddress, patchInfo.patchdata.jmpaddress, out patchInfo.patchdata.orgbytes, out patchInfo.patchdata.jmpbytes);
PatchTools.RememberObject(original, replacement); // no gc for new value + release old value to gc
}
/// <summary>Creates new dynamic method with the latest patches and detours the original method</summary>
/// <param name="original">The original method</param>
/// <param name="patchInfo">Information describing the patches</param>
/// <param name="instanceID">Harmony ID</param>
/// <returns>The newly created dynamic method</returns>
///
internal static DynamicMethod UpdateWrapper(MethodBase original, PatchInfo patchInfo, string instanceID)
{
var sortedPrefixes = GetSortedPatchMethods(original, patchInfo.prefixes);
var sortedPostfixes = GetSortedPatchMethods(original, patchInfo.postfixes);
var sortedTranspilers = GetSortedPatchMethods(original, patchInfo.transpilers);
var replacement = MethodPatcher.CreatePatchedMethod(original, instanceID, sortedPrefixes, sortedPostfixes, sortedTranspilers);
if (replacement == null)
{
throw new MissingMethodException("Cannot create dynamic replacement for " + original.FullDescription());
}
var errorString = Memory.DetourMethod(original, replacement);
if (errorString != null)
{
throw new FormatException("Method " + original.FullDescription() + " cannot be patched. Reason: " + errorString);
}
PatchTools.RememberObject(original, replacement); // no gc for new value + release old value to gc
return(replacement);
}
public static void RemovePatch(PatchInfo patchInfo, MethodInfo patch)
{
patchInfo.RemovePatch(patch);
}
public static void RemoveTranspiler(PatchInfo patchInfo, string owner)
{
patchInfo.RemoveTranspiler(owner);
}
public static void RemovePostfix(PatchInfo patchInfo, string owner)
{
patchInfo.RemovePostfix(owner);
}
public static DynamicMethod UpdateWrapper(MethodBase original, PatchInfo patchInfo, string instanceID)
{
throw new NotImplementedException("PatchFunctions.UpdateWrapper not supported");
}
internal static void UpdatePatchInfo(MethodBase method, PatchInfo patchInfo)
{
GetState()[method] = patchInfo.Serialize();
}
/// <summary>Removes a patch method</summary>
/// <param name="patchInfo">The patch info</param>
/// <param name="patch">The patch method</param>
///
internal static void RemovePatch(PatchInfo patchInfo, MethodInfo patch)
{
patchInfo.RemovePatch(patch);
}
/// <summary>Removes a prefix</summary>
/// <param name="patchInfo">The patch info</param>
/// <param name="owner">The owner (Harmony ID)</param>
///
internal static void RemovePrefix(PatchInfo patchInfo, string owner)
{
patchInfo.RemovePrefix(owner);
}
