public static IntPtr ResolveICall(string signature)
{
MelonDebug.Msg("Resolving ICall " + signature);
IntPtr icallPtr;
if (MelonUtils.IsGameIl2Cpp())
{
icallPtr = il2cpp_resolve_icall(signature);
}
else
{
// We generate a fake MonoMethod + MonoMethodSignature + MonoClass struct to exploit the lookup code and force resolve our icall without the class/method being registered
// (Slaynash: Yes this is illegal)
MonoMethod *monoMethod = IcallToFakeMonoMethod(signature);
icallPtr = mono_lookup_internal_call((IntPtr)monoMethod);
DestroyFakeMonoMethod(monoMethod);
}
if (icallPtr == IntPtr.Zero)
{
//MelonLogger.Error($"ICall {signature} not resolved");
//return IntPtr.Zero;
throw new Exception($"ICall {signature} not resolved");
}
MelonDebug.Msg($" > 0x{(long)icallPtr:X}");
return(icallPtr);
}
private static unsafe void DestroyFakeMonoMethod(MonoMethod *monoMethod)
{
Marshal.FreeHGlobal((IntPtr)monoMethod->signature);
Marshal.FreeHGlobal(*(IntPtr *)((long)&monoMethod->klass->nested_in_0x04 + monoClassOffset));
Marshal.FreeHGlobal(*(IntPtr *)((long)&monoMethod->klass->nested_in_0x08 + monoClassOffset));
Marshal.FreeHGlobal((IntPtr)monoMethod->klass);
Marshal.FreeHGlobal((IntPtr)monoMethod->name);
Marshal.FreeHGlobal((IntPtr)monoMethod);
}
private static unsafe MonoMethod *IcallToFakeMonoMethod(string icallName)
{
string[] typeAndMethod = icallName.Split(new[] { "::" }, StringSplitOptions.None);
int parenthesisIndex = typeAndMethod[1].IndexOf('(');
if (parenthesisIndex >= 0)
{
typeAndMethod[1] = typeAndMethod[1].Substring(0, parenthesisIndex);
}
// We add a padding to the end of each allocated memory since our structs are supposed to be bigger than the one we have here
MonoMethod *monoMethod = (MonoMethod *)Marshal.AllocHGlobal(sizeof(MonoMethod) + 0x100);
monoMethod->applyZeroes();
monoMethod->klass = (MonoClass *)Marshal.AllocHGlobal(sizeof(MonoClass) + 0x100);
monoMethod->klass->applyZeroes();
monoMethod->name = (byte *)Marshal.StringToHGlobalAnsi(typeAndMethod[1]);
int lastDotIndex = typeAndMethod[0].LastIndexOf('.');
if (lastDotIndex < 0)
{
*(IntPtr *)((long)&monoMethod->klass->nested_in_0x08 + monoClassOffset) = Marshal.StringToHGlobalAnsi("");
*(IntPtr *)((long)&monoMethod->klass->nested_in_0x04 + monoClassOffset) = Marshal.StringToHGlobalAnsi(typeAndMethod[0]);
}
else
{
string name_space = typeAndMethod[0].Substring(0, lastDotIndex);
string name = typeAndMethod[0].Substring(lastDotIndex + 1);
*(IntPtr *)((long)&monoMethod->klass->nested_in_0x08 + monoClassOffset) = Marshal.StringToHGlobalAnsi(name_space);
*(IntPtr *)((long)&monoMethod->klass->nested_in_0x04 + monoClassOffset) = Marshal.StringToHGlobalAnsi(name);
}
MonoMethodSignature *monoMethodSignature = (MonoMethodSignature *)Marshal.AllocHGlobal(sizeof(MonoMethodSignature));
monoMethodSignature->ApplyZeroes();
monoMethod->signature = monoMethodSignature;
return(monoMethod);
}
