Fix: missing DescriptorDeleteMarker conversions.

Author: fangerer

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/cext/CExtNodes.java

@@ -494,7 +494,7 @@ protected static PythonClassNativeWrapper wrapNativeClass(PythonManagedClass obj
 
         static boolean isFallback(Object object, PythonObjectLibrary lib) {
             return !(object instanceof String || object instanceof Boolean || object instanceof Integer || object instanceof Long || object instanceof Double ||
-                            object instanceof PythonNativeNull || object instanceof PythonAbstractObject) &&
+                            object instanceof PythonNativeNull || object == DescriptorDeleteMarker.INSTANCE || object instanceof PythonAbstractObject) &&
                             !(lib.isForeignObject(object) && !CApiGuards.isNativeWrapper(object));
         }
 
@@ -656,6 +656,12 @@ static Object doNativeNull(CExtContext cextContext, PythonNativeNull object) {
             return ToSulongNode.doNativeNull(cextContext, object);
         }
 
+        @Specialization
+        static Object doDeleteMarker(CExtContext cextContext, DescriptorDeleteMarker marker,
+                        @Cached GetNativeNullNode getNativeNullNode) {
+            return ToSulongNode.doDeleteMarker(cextContext, marker, getNativeNullNode);
+        }
+
         @Specialization(guards = {"object == cachedObject", "isSpecialSingleton(cachedObject)"})
         static Object doSingletonCached(CExtContext cextContext, @SuppressWarnings("unused") PythonAbstractObject object,
                         @Cached("object") PythonAbstractObject cachedObject,
@@ -827,6 +833,12 @@ static Object doNativeNull(CExtContext cextContext, PythonNativeNull object) {
             return ToSulongNode.doNativeNull(cextContext, object);
         }
 
+        @Specialization
+        static Object doDeleteMarker(CExtContext cextContext, DescriptorDeleteMarker marker,
+                        @Cached GetNativeNullNode getNativeNullNode) {
+            return ToSulongNode.doDeleteMarker(cextContext, marker, getNativeNullNode);
+        }
+
         @Specialization(guards = {"object == cachedObject", "isSpecialSingleton(cachedObject)"})
         static Object doSingletonCached(CExtContext cextContext, @SuppressWarnings("unused") PythonAbstractObject object,
                         @Cached("object") PythonAbstractObject cachedObject,
@@ -1003,6 +1015,9 @@ protected static boolean isFallback(Object obj, GetLazyClassNode getClassNode, I
             if (CApiGuards.isNativeNull(obj)) {
                 return false;
             }
+            if (obj == DescriptorDeleteMarker.INSTANCE) {
+                return false;
+            }
             if (PGuards.isAnyPythonObject(obj)) {
                 return false;
             }

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/getsetdescriptor/DescriptorDeleteMarker.java

@@ -40,7 +40,9 @@
  */
 package com.oracle.graal.python.builtins.objects.getsetdescriptor;
 
-public class DescriptorDeleteMarker {
+import com.oracle.truffle.api.interop.TruffleObject;
+
+public class DescriptorDeleteMarker implements TruffleObject {
     public static final DescriptorDeleteMarker INSTANCE = new DescriptorDeleteMarker();
 
     private DescriptorDeleteMarker() {