Add __isabstractmethod__ to staticmethod and classmethod

Author: msimacek

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/method/DecoratedMethodBuiltins.java

@@ -44,6 +44,7 @@
 import static com.oracle.graal.python.nodes.SpecialAttributeNames.__DICT__;
 import static com.oracle.graal.python.nodes.SpecialAttributeNames.__FUNC__;
 import static com.oracle.graal.python.nodes.SpecialMethodNames.__INIT__;
+import static com.oracle.graal.python.nodes.SpecialMethodNames.__ISABSTRACTMETHOD__;
 
 import java.util.List;
 
@@ -66,8 +67,10 @@
 import com.oracle.truffle.api.dsl.ImportStatic;
 import com.oracle.truffle.api.dsl.NodeFactory;
 import com.oracle.truffle.api.dsl.Specialization;
+import com.oracle.truffle.api.frame.VirtualFrame;
 import com.oracle.truffle.api.interop.UnsupportedMessageException;
 import com.oracle.truffle.api.library.CachedLibrary;
+import com.oracle.truffle.api.profiles.ConditionProfile;
 
 @CoreFunctions(extendClasses = {PythonBuiltinClassType.PStaticmethod, PythonBuiltinClassType.PClassmethod})
 public class DecoratedMethodBuiltins extends PythonBuiltins {
@@ -134,4 +137,19 @@ protected Object setDict(@SuppressWarnings("unused") PDecoratedMethod self, Obje
             throw raise(TypeError, ErrorMessages.DICT_MUST_BE_SET_TO_DICT, mapping);
         }
     }
+
+    @Builtin(name = __ISABSTRACTMETHOD__, minNumOfPositionalArgs = 1, isGetter = true)
+    @GenerateNodeFactory
+    abstract static class IsAbstractMethodNode extends PythonUnaryBuiltinNode {
+        @Specialization
+        static boolean isAbstract(VirtualFrame frame, PDecoratedMethod self,
+                        @CachedLibrary(limit = "4") PythonObjectLibrary lib,
+                        @Cached ConditionProfile hasAttrProfile) {
+            Object result = lib.lookupAttribute(self.getCallable(), frame, __ISABSTRACTMETHOD__);
+            if (hasAttrProfile.profile(result != PNone.NO_VALUE)) {
+                return lib.isTrue(result, frame);
+            }
+            return false;
+        }
+    }
 }

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/SpecialMethodNames.java

@@ -156,6 +156,7 @@ public abstract class SpecialMethodNames {
     public static final String __GETFORMAT__ = "__getformat__";
     public static final String __SETFORMAT__ = "__setformat__";
     public static final String __OBJCLASS__ = "__objclass__";
+    public static final String __ISABSTRACTMETHOD__ = "__isabstractmethod__";
     public static final String KEYS = "keys";
     public static final String ITEMS = "items";
     public static final String VALUES = "values";