Thread: [Jython-checkins] SF.net SVN: jython:[5372] trunk/jython (Page 2)

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Revision: 5372
          http://jython.svn.sourceforge.net/jython/?rev=5372&view=rev
Author:   pjenvey
Date:     2008-10-11 06:42:35 +0000 (Sat, 11 Oct 2008)

Log Message:
-----------
fix solid_base potentially resolving the wrong type when called before the mro
was initialized. caused best_base to blowup with a TypeError

Modified Paths:
--------------
    trunk/jython/Lib/test/test_class_jy.py
    trunk/jython/src/org/python/core/PyType.java

Modified: trunk/jython/Lib/test/test_class_jy.py
===================================================================

--- trunk/jython/Lib/test/test_class_jy.py	2008-10-11 05:08:23 UTC (rev 5371)
+++ trunk/jython/Lib/test/test_class_jy.py	2008-10-11 06:42:35 UTC (rev 5372)
@@ -152,7 +152,17 @@
         keys.sort()
         self.assertEqual(str(keys), "['__doc__', '__module__', 'moo']")
 
+    def test_metaclass_and_slotted_base(self):
+        class Meta(type):
+            pass
+        class SlottedBase(object):
+            __slots__ = 'foo'
+        # A regression up until 2.5a3: Defining Bar would cause a
+        # TypeError "mro() returned base with unsuitable layout ('Bar')"
+        class Bar(SlottedBase):
+            __metaclass__ = Meta
 
+
 class ClassNamelessModuleTestCase(unittest.TestCase):
 
     def setUp(self):
@@ -298,6 +308,7 @@
         class Bar(object):
             self.assertEqual(__module__, module_name)
 
+
 class ClassMetaclassRepr(unittest.TestCase):
     """Verifies #1131 is fixed"""
     def test_repr_with_metaclass(self):

Modified: trunk/jython/src/org/python/core/PyType.java
===================================================================
--- trunk/jython/src/org/python/core/PyType.java	2008-10-11 05:08:23 UTC (rev 5371)
+++ trunk/jython/src/org/python/core/PyType.java	2008-10-11 06:42:35 UTC (rev 5372)
@@ -47,7 +47,7 @@
     private PyObject dict;
 
     /** __mro__, the method resolution. order */
-    private PyObject[] mro = new PyObject[0];
+    private PyObject[] mro = null;
 
     /** __flags__, the type's options. */
     private long tp_flags;
@@ -645,7 +645,7 @@
 
     @ExposedGet(name = "__mro__")
     public PyTuple getMro() {
-        return new PyTuple(mro);
+        return mro == null ? Py.EmptyTuple : new PyTuple(mro);
     }
 
     @ExposedGet(name = "__flags__")
@@ -929,11 +929,24 @@
 
     public boolean isSubType(PyType supertype) {
         PyObject[] mro = this.mro;
-        for (int i = 0; i < mro.length; i++) {
-            if (mro[i] == supertype)
+        if (mro != null) {
+            for (PyObject base : mro) {
+                if (base == supertype) {
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        // we're not completely initilized yet; follow tp_base
+        PyType type = this;
+        do {
+            if (type == supertype) {
                 return true;
-        }
-        return false;
+            }
+            type = type.base;
+        } while (type != null);
+        return supertype == PyObject.TYPE;
     }
 
     /**
@@ -945,6 +958,9 @@
      */
     public PyObject lookup(String name) {
         PyObject[] mro = this.mro;
+        if (mro == null) {
+            return null;
+        }
         for (int i = 0; i < mro.length; i++) {
             PyObject dict = mro[i].fastGetDict();
             if (dict != null) {
@@ -958,6 +974,9 @@
 
     public PyObject lookup_where(String name, PyObject[] where) {
         PyObject[] mro = this.mro;
+        if (mro == null) {
+            return null;
+        }
         for (int i = 0; i < mro.length; i++) {
             PyObject t = mro[i];
             PyObject dict = t.fastGetDict();
@@ -974,6 +993,9 @@
 
     public PyObject super_lookup(PyType ref, String name) {
         PyObject[] mro = this.mro;
+        if (mro == null) {
+            return null;
+        }
         int i;
         for (i = 0; i < mro.length; i++) {
             if (mro[i] == ref)
@@ -1235,6 +1257,9 @@
 
     protected void __rawdir__(PyDictionary accum) {
         PyObject[] mro = this.mro;
+        if (mro == null) {
+            return;
+        }
         for (int i = 0; i < mro.length; i++) {
             mro[i].addKeys(accum, "__dict__");
         }


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