more specific specializations for class instantiation

Author: timfel

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

@@ -90,6 +90,7 @@
 import com.oracle.graal.python.builtins.objects.tuple.PTuple;
 import com.oracle.graal.python.builtins.objects.type.PythonAbstractClass;
 import com.oracle.graal.python.builtins.objects.type.PythonBuiltinClass;
+import com.oracle.graal.python.builtins.objects.type.PythonClass;
 import com.oracle.graal.python.builtins.objects.type.PythonManagedClass;
 import com.oracle.graal.python.nodes.object.GetClassNode;
 import com.oracle.graal.python.nodes.object.IsBuiltinClassProfile;
@@ -310,7 +311,7 @@ public static boolean isIndexNegative(long idx) {
     }
 
     public static boolean isPythonUserClass(Object klass) {
-        return !isPythonBuiltinClass(klass);
+        return klass instanceof PythonClass || PythonNativeClass.isInstance(klass);
     }
 
     public static boolean isPythonBuiltinClassType(Object klass) {

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/call/CallNode.java

@@ -121,7 +121,25 @@ protected Object builtinFunctionCall(VirtualFrame frame, PBuiltinFunction callab
         return dispatch.executeCall(frame, callable, createArgs.execute(callable, arguments, keywords));
     }
 
-    @Specialization(guards = "!isCallable(callableObject)")
+    @Specialization
+    protected Object doType(VirtualFrame frame, PythonBuiltinClassType callableObject, Object[] arguments, PKeyword[] keywords,
+                    @Cached PRaiseNode raise,
+                    @Cached("create(__CALL__)") LookupInheritedAttributeNode callAttrGetterNode,
+                    @Cached CallVarargsMethodNode callCallNode) {
+        Object call = callAttrGetterNode.execute(callableObject);
+        return callCall(frame, callableObject, arguments, keywords, raise, callCallNode, call);
+    }
+
+    @Specialization(guards = "isPythonClass(callableObject)", replaces = "doType")
+    protected Object doPythonClass(VirtualFrame frame, Object callableObject, Object[] arguments, PKeyword[] keywords,
+                    @Cached PRaiseNode raise,
+                    @Cached("create(__CALL__)") LookupInheritedAttributeNode callAttrGetterNode,
+                    @Cached CallVarargsMethodNode callCallNode) {
+        Object call = callAttrGetterNode.execute(callableObject);
+        return callCall(frame, callableObject, arguments, keywords, raise, callCallNode, call);
+    }
+
+    @Specialization(guards = "!isCallable(callableObject)", replaces = {"doType", "doPythonClass"})
     protected Object doObjectAndType(VirtualFrame frame, Object callableObject, Object[] arguments, PKeyword[] keywords,
                     @Shared("raise") @Cached PRaiseNode raise,
                     @Shared("lookupCall") @Cached("create(__CALL__)") LookupInheritedAttributeNode callAttrGetterNode,