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Fix for Unity3D GetFunctionPointer #16

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Fix for Unity3D GetFunctionPointer #16

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40 changes: 40 additions & 0 deletions RuntimeDetour/Platforms/Runtime/DetourRuntimeILPlatform.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -147,8 +147,48 @@ private static unsafe void _SelftestGetStructHook(IntPtr a, IntPtr b, IntPtr c,

#endregion

#if UNITY_5_3_OR_NEWER //source https://github.com/Misaka-Mikoto-Tech/MonoHook
[StructLayout(LayoutKind.Sequential, Pack = 1)] // 好像在 IL2CPP 里无效
private struct __ForCopy
{
public long __dummy;
public MethodBase method;
}
protected virtual unsafe IntPtr GetFunctionPointer(MethodBase method,RuntimeMethodHandle handle)
{
// if (!LDasm.IsIL2CPP())
// return method.MethodHandle.GetFunctionPointer();
// else
__ForCopy __forCopy = new __ForCopy() {method = method};

long* ptr = &__forCopy.__dummy;
ptr++; // addr of _forCopy.method

IntPtr methodAddr = IntPtr.Zero;
if (sizeof(IntPtr) == 8)
{
long methodDataAddr = *(long*) ptr;
byte* ptrData = (byte*) methodDataAddr + sizeof(IntPtr) * 2; // offset of Il2CppReflectionMethod::const MethodInfo *method;

long methodPtr = 0;
methodPtr = *(long*) ptrData;
methodAddr = new IntPtr(*(long*) methodPtr); // MethodInfo::Il2CppMethodPointer methodPointer;
}
else
{
int methodDataAddr = *(int*) ptr;
byte* ptrData = (byte*) methodDataAddr + sizeof(IntPtr) * 2; // offset of Il2CppReflectionMethod::const MethodInfo *method;

int methodPtr = 0;
methodPtr = *(int*) ptrData;
methodAddr = new IntPtr(*(int*) methodPtr);
}
return methodAddr;
}
#else
protected virtual IntPtr GetFunctionPointer(MethodBase method, RuntimeMethodHandle handle)
=> handle.GetFunctionPointer();
#endif

protected virtual void PrepareMethod(MethodBase method, RuntimeMethodHandle handle)
=> RuntimeHelpers.PrepareMethod(handle);
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