Support copying/slice assigning with dtype object

Cython/Compiler/MemoryView.py

@@ -441,9 +441,10 @@ def copy_broadcast_memview_src_to_dst(src, dst, code):
     verify_direct_dimensions(dst)
 
     code.putln(code.error_goto_if_neg(
-            "%s(%s, %s, %d, %d)" % (copy_src_to_dst_cname(),
-                                      src.result(), dst.result(),
-                                      src.type.ndim, dst.type.ndim),
+            "%s(%s, %s, %d, %d, %d)" % (copy_src_to_dst_cname(),
+                                        src.result(), dst.result(),
+                                        src.type.ndim, dst.type.ndim,
+                                        dst.type.dtype.is_pyobject),
             dst.pos))
 
 def copy_c_or_fortran_cname(memview):
@@ -483,7 +484,8 @@ def get_copy_new_utility(pos, from_memview, to_memview):
             dtype_decl=to_memview.dtype.declaration_code(''),
             contig_flag=contig_flag,
             ndim=to_memview.ndim,
-            func_cname=copy_c_or_fortran_cname(to_memview)),
+            func_cname=copy_c_or_fortran_cname(to_memview),
+            dtype_is_object=int(to_memview.dtype.is_pyobject)),
         requires=[copy_contents_new_utility])
 
 def get_axes_specs(env, axes):

Cython/Compiler/PyrexTypes.py

@@ -643,8 +643,9 @@ class MemoryViewSliceType(PyrexType):
         to_py_func = "(PyObject *(*)(char *)) " + to_py_func
         from_py_func = "(int (*)(char *, PyObject *)) " + from_py_func
 
-        tup = (obj.result(), self.ndim, to_py_func, from_py_func)
-        return "__pyx_memoryview_fromslice(&%s, %s, %s, %s);" % tup
+        tup = (obj.result(), self.ndim, to_py_func, from_py_func,
+               self.dtype.is_pyobject)
+        return "__pyx_memoryview_fromslice(&%s, %s, %s, %s, %d);" % tup
 
     def dtype_object_conversion_funcs(self, env):
         import MemoryView, Code

Cython/Utility/MemoryView_C.c

@@ -162,7 +162,7 @@ static CYTHON_INLINE {{memviewslice_name}} {{funcname}}(PyObject *obj) {
     {{memviewslice_name}} result = {{memslice_init}};
 
     struct __pyx_memoryview_obj *memview =  \
-        (struct __pyx_memoryview_obj *) __pyx_memoryview_new(obj, {{buf_flag}});
+        (struct __pyx_memoryview_obj *) __pyx_memoryview_new(obj, {{buf_flag}}, 0);
     __Pyx_BufFmt_StackElem stack[{{struct_nesting_depth}}];
     int axes_specs[] = { {{axes_specs}} };
     int retcode;
@@ -464,13 +464,15 @@ static CYTHON_INLINE void __Pyx_XDEC_MEMVIEW({{memviewslice_name}} *memslice,
 static {{memviewslice_name}}
 __pyx_memoryview_copy_new_contig(const __Pyx_memviewslice *from_mvs,
                                  const char *mode, int ndim,
-                                 size_t sizeof_dtype, int contig_flag);
+                                 size_t sizeof_dtype, int contig_flag,
+                                 int dtype_is_object);
 
 ////////// MemviewSliceCopyTemplate //////////
 static {{memviewslice_name}}
 __pyx_memoryview_copy_new_contig(const __Pyx_memviewslice *from_mvs,
                                  const char *mode, int ndim,
-                                 size_t sizeof_dtype, int contig_flag)
+                                 size_t sizeof_dtype, int contig_flag,
+                                 int dtype_is_object)
 {
     __Pyx_RefNannyDeclarations
     int i;
@@ -515,7 +517,8 @@ __pyx_memoryview_copy_new_contig(const __Pyx_memviewslice *from_mvs,
     __Pyx_GOTREF(array_obj);
 
     memview_obj = (struct __pyx_memoryview_obj *) __pyx_memoryview_new(
-                                (PyObject *) array_obj, contig_flag);
+                                    (PyObject *) array_obj, contig_flag,
+                                    dtype_is_object);
     if (unlikely(!memview_obj))
         goto fail;
 
@@ -523,7 +526,8 @@ __pyx_memoryview_copy_new_contig(const __Pyx_memviewslice *from_mvs,
     if (unlikely(__Pyx_init_memviewslice(memview_obj, ndim, &new_mvs) < 0))
         goto fail;
 
-    if (unlikely(__pyx_memoryview_copy_contents(*from_mvs, new_mvs, ndim, ndim) < 0))
+    if (unlikely(__pyx_memoryview_copy_contents(*from_mvs, new_mvs, ndim, ndim,
+                                                dtype_is_object) < 0))
         goto fail;
 
     goto no_fail;
@@ -543,8 +547,9 @@ no_fail:
 
 ////////// CopyContentsUtility.proto /////////
 #define {{func_cname}}(slice) \
-        __pyx_memoryview_copy_new_contig(&slice, "{{mode}}", {{ndim}}, \
-                                         sizeof({{dtype_decl}}), {{contig_flag}})
+        __pyx_memoryview_copy_new_contig(&slice, "{{mode}}", {{ndim}},            \
+                                         sizeof({{dtype_decl}}), {{contig_flag}}, \
+                                         {{dtype_is_object}})
 
 ////////// OverlappingSlices.proto //////////
 static int __pyx_slices_overlap({{memviewslice_name}} *slice1,

tests/run/memslice.pyx

@@ -1880,3 +1880,64 @@ cdef _not_borrowed2(int[:] m):
     print m[5]
     if object():
         m = carray
+
+class SingleObject(object):
+    def __init__(self, value):
+        self.value = value
+
+    def __str__(self):
+        return str(self.value)
+
+@testcase
+def test_object_dtype_copying():
+    """
+    >>> test_object_dtype_copying()
+    True
+    0
+    1
+    2
+    3
+    4
+    5
+    6
+    7
+    8
+    9
+    3 5
+    2 5
+    """
+    cdef int i
+
+    none_refcount = get_refcount(None)
+
+    cdef cython.array a1 = cython.array((10,), sizeof(PyObject *), 'O')
+    cdef cython.array a2 = cython.array((10,), sizeof(PyObject *), 'O')
+
+    print a1.dtype_is_object
+
+    cdef object[:] m1 = a1
+    cdef object[:] m2 = a2
+
+    for i in range(10):
+        # Initialize to None first
+        (<PyObject **> a1.data)[i] = <PyObject *> None
+        Py_INCREF(None)
+        (<PyObject **> a2.data)[i] = <PyObject *> None
+        Py_INCREF(None)
+
+        # now set a unique object
+        m1[i] = SingleObject(i)
+
+    m2[...] = m1
+    del a1, a2, m1
+
+    for i in range(10):
+        print m2[i]
+
+    obj = m2[5]
+    print get_refcount(obj), obj
+
+    del m2
+    print get_refcount(obj), obj
+
+    assert none_refcount == get_refcount(None)