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Question by Martin-S · Oct 21, 2014 at 09:46 AM · c#iosmono

JIT compilation requirement for System.Reflection.PropertyInfo.GetValue?

Calling System.Reflection.PropertyInfo.GetValue on an AOT compiled platform when the API compatibility level is set to .NET 2.0 gives me the following error:

Unhandled Exception: System.ExecutionEngineException: Attempting to JIT compile method 'System.Reflection.MonoProperty:StaticGetterAdapterFrame (System.Reflection.MonoProperty/StaticGetter`1,object)' while running with --aot-only.

at System.Reflection.MonoProperty.GetValue (System.Object obj, System.Object[] index) [0x00000] in :0

The error does not occur when the API compatibility level is set to .NET 2.0 Subset. Is this expected behaviour or a Unity bug?

Here is my code

 void Start()
 {
     System.Type type = System.Type.GetType("UnityEngine.iPhone, UnityEngine, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null");
     if (type != null)
     {
         System.Reflection.PropertyInfo property = type.GetProperty("generation");
         if (property != null)
         {
             string text = property.GetValue(null, null).ToString().ToLower();
             Debug.Log("text = " + text);
         }
         else
             Debug.Log("property = null");
     }
 }

This was added to a new empty project in Unity 4.5.5 and deployed to a 1st generation iPad Mini running iOS 7.1.2.

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avatar image Ray-Pendergraph · Jan 06, 2015 at 12:54 PM 0
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This appears to be an issue in the $$anonymous$$onoProperty class. Looking at the source it looks like they put in conditionals for AOT compilation. I suspect maybe an edge case was missed. Either way it's in the core $$anonymous$$ono library so i don't know if opening a Unity bug would be fruitful. Did you open one?

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Answer by mossyblog · Jan 08, 2016 at 02:51 PM

If you switch Unity to use Mono Subset, this should bypass that error. I'm still trying to isolate specifically why GetValue works in this subset... as from where i can tell Subset is a reduction in namespaces only on Mono..

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