Allow __delete__ for C descriptors

Author: msimacek

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/PythonCextBuiltins.java

@@ -1654,7 +1654,7 @@ PThreadState get() {
     public abstract static class GetSetDescriptorNode extends PythonBuiltinNode {
         @Specialization(guards = {"!isNoValue(get)", "!isNoValue(set)"})
         Object call(Object get, Object set, String name, LazyPythonClass owner) {
-            return factory().createGetSetDescriptor(get, set, name, owner);
+            return factory().createGetSetDescriptor(get, set, name, owner, true);
         }
 
         @Specialization(guards = {"!isNoValue(get)", "isNoValue(set)"})
@@ -1664,7 +1664,7 @@ Object call(Object get, @SuppressWarnings("unused") PNone set, String name, Lazy
 
         @Specialization(guards = {"isNoValue(get)", "!isNoValue(set)"})
         Object call(@SuppressWarnings("unused") PNone get, Object set, String name, LazyPythonClass owner) {
-            return factory().createGetSetDescriptor(null, set, name, owner);
+            return factory().createGetSetDescriptor(null, set, name, owner, true);
         }
     }
 

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

@@ -90,6 +90,7 @@
 import com.oracle.graal.python.builtins.objects.floats.PFloat;
 import com.oracle.graal.python.builtins.objects.function.PFunction;
 import com.oracle.graal.python.builtins.objects.function.PKeyword;
+import com.oracle.graal.python.builtins.objects.getsetdescriptor.DescriptorDeleteMarker;
 import com.oracle.graal.python.builtins.objects.ints.PInt;
 import com.oracle.graal.python.builtins.objects.module.PythonModule;
 import com.oracle.graal.python.builtins.objects.object.PythonObjectLibrary;
@@ -411,6 +412,14 @@ static Object doNativeNull(@SuppressWarnings("unused") CExtContext cextContext,
             return object.getPtr();
         }
 
+        @Specialization
+        static Object doDeleteMarker(@SuppressWarnings("unused") CExtContext cextContext, DescriptorDeleteMarker marker,
+                        @Cached GetNativeNullNode getNativeNullNode) {
+            assert marker == DescriptorDeleteMarker.INSTANCE;
+            PythonNativeNull nativeNull = (PythonNativeNull) getNativeNullNode.execute();
+            return nativeNull.getPtr();
+        }
+
         @Specialization(guards = {"object == cachedObject", "isSpecialSingleton(cachedObject)"})
         static Object doSingletonCached(CExtContext cextContext, @SuppressWarnings("unused") PythonAbstractObject object,
                         @Cached("object") PythonAbstractObject cachedObject,