From bf6c7eca43d7c7d80525c97af08aef52ec81e4a1 Mon Sep 17 00:00:00 2001 From: Stefan Krah Date: Mon, 5 Mar 2012 14:37:34 +0100 Subject: Issue #14181: Test creating memoryviews from a static exporter with both view.obj==NULL and view.obj==base. --- Lib/test/test_buffer.py | 94 ++++++++++++++++++++++++++++++++++++ Modules/_testbuffer.c | 126 +++++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 219 insertions(+), 1 deletion(-) diff --git a/Lib/test/test_buffer.py b/Lib/test/test_buffer.py index 8a8d55d..533338e 100644 --- a/Lib/test/test_buffer.py +++ b/Lib/test/test_buffer.py @@ -3515,6 +3515,100 @@ class TestBufferProtocol(unittest.TestCase): del y, z self.assertEqual(m[1:3], x[1:3]) + def test_memoryview_from_static_exporter(self): + + fmt = 'B' + lst = [0,1,2,3,4,5,6,7,8,9,10,11] + + # exceptions + self.assertRaises(TypeError, staticarray, 1, 2, 3) + + # view.obj==x + x = staticarray() + y = memoryview(x) + self.verify(y, obj=x, + itemsize=1, fmt=fmt, readonly=1, + ndim=1, shape=[12], strides=[1], + lst=lst) + for i in range(12): + self.assertEqual(y[i], i) + del x + del y + + x = staticarray() + y = memoryview(x) + del y + del x + + x = staticarray() + y = ndarray(x, getbuf=PyBUF_FULL_RO) + z = ndarray(y, getbuf=PyBUF_FULL_RO) + m = memoryview(z) + self.assertIs(y.obj, x) + self.assertIs(m.obj, z) + self.verify(m, obj=z, + itemsize=1, fmt=fmt, readonly=1, + ndim=1, shape=[12], strides=[1], + lst=lst) + del x, y, z, m + + x = staticarray() + y = ndarray(x, getbuf=PyBUF_FULL_RO, flags=ND_REDIRECT) + z = ndarray(y, getbuf=PyBUF_FULL_RO, flags=ND_REDIRECT) + m = memoryview(z) + self.assertIs(y.obj, x) + self.assertIs(z.obj, x) + self.assertIs(m.obj, x) + self.verify(m, obj=x, + itemsize=1, fmt=fmt, readonly=1, + ndim=1, shape=[12], strides=[1], + lst=lst) + del x, y, z, m + + # view.obj==NULL + x = staticarray(legacy_mode=True) + y = memoryview(x) + self.verify(y, obj=None, + itemsize=1, fmt=fmt, readonly=1, + ndim=1, shape=[12], strides=[1], + lst=lst) + for i in range(12): + self.assertEqual(y[i], i) + del x + del y + + x = staticarray(legacy_mode=True) + y = memoryview(x) + del y + del x + + x = staticarray(legacy_mode=True) + y = ndarray(x, getbuf=PyBUF_FULL_RO) + z = ndarray(y, getbuf=PyBUF_FULL_RO) + m = memoryview(z) + self.assertIs(y.obj, None) + self.assertIs(m.obj, z) + self.verify(m, obj=z, + itemsize=1, fmt=fmt, readonly=1, + ndim=1, shape=[12], strides=[1], + lst=lst) + del x, y, z, m + + x = staticarray(legacy_mode=True) + y = ndarray(x, getbuf=PyBUF_FULL_RO, flags=ND_REDIRECT) + z = ndarray(y, getbuf=PyBUF_FULL_RO, flags=ND_REDIRECT) + m = memoryview(z) + # Clearly setting view.obj==NULL is inferior, since it + # messes up the redirection chain: + self.assertIs(y.obj, None) + self.assertIs(z.obj, y) + self.assertIs(m.obj, y) + self.verify(m, obj=y, + itemsize=1, fmt=fmt, readonly=1, + ndim=1, shape=[12], strides=[1], + lst=lst) + del x, y, z, m + def test_issue_7385(self): x = ndarray([1,2,3], shape=[3], flags=ND_GETBUF_FAIL) self.assertRaises(BufferError, memoryview, x) diff --git a/Modules/_testbuffer.c b/Modules/_testbuffer.c index d1bf258..63f6b53 100644 --- a/Modules/_testbuffer.c +++ b/Modules/_testbuffer.c @@ -2602,6 +2602,126 @@ static PyTypeObject NDArray_Type = { ndarray_new, /* tp_new */ }; +/**************************************************************************/ +/* StaticArray Object */ +/**************************************************************************/ + +static PyTypeObject StaticArray_Type; + +typedef struct { + PyObject_HEAD + int legacy_mode; /* if true, use the view.obj==NULL hack */ +} StaticArrayObject; + +static char static_mem[12] = {0,1,2,3,4,5,6,7,8,9,10,11}; +static Py_ssize_t static_shape[1] = {12}; +static Py_ssize_t static_strides[1] = {1}; +static Py_buffer static_buffer = { + static_mem, /* buf */ + NULL, /* obj */ + 12, /* len */ + 1, /* itemsize */ + 1, /* readonly */ + 1, /* ndim */ + "B", /* format */ + static_shape, /* shape */ + static_strides, /* strides */ + NULL, /* suboffsets */ + NULL /* internal */ +}; + +static PyObject * +staticarray_new(PyTypeObject *type, PyObject *args, PyObject *kwds) +{ + return (PyObject *)PyObject_New(StaticArrayObject, &StaticArray_Type); +} + +static int +staticarray_init(PyObject *self, PyObject *args, PyObject *kwds) +{ + StaticArrayObject *a = (StaticArrayObject *)self; + static char *kwlist[] = { + "legacy_mode", NULL + }; + PyObject *legacy_mode = Py_False; + + if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O", kwlist, &legacy_mode)) + return -1; + + a->legacy_mode = (legacy_mode != Py_False); + return 0; +} + +static void +staticarray_dealloc(StaticArrayObject *self) +{ + PyObject_Del(self); +} + +/* Return a buffer for a PyBUF_FULL_RO request. Flags are not checked, + which makes this object a non-compliant exporter! */ +static int +staticarray_getbuf(StaticArrayObject *self, Py_buffer *view, int flags) +{ + *view = static_buffer; + + if (self->legacy_mode) { + view->obj = NULL; /* Don't use this in new code. */ + } + else { + view->obj = (PyObject *)self; + Py_INCREF(view->obj); + } + + return 0; +} + +static PyBufferProcs staticarray_as_buffer = { + (getbufferproc)staticarray_getbuf, /* bf_getbuffer */ + NULL, /* bf_releasebuffer */ +}; + +static PyTypeObject StaticArray_Type = { + PyVarObject_HEAD_INIT(NULL, 0) + "staticarray", /* Name of this type */ + sizeof(StaticArrayObject), /* Basic object size */ + 0, /* Item size for varobject */ + (destructor)staticarray_dealloc, /* tp_dealloc */ + 0, /* tp_print */ + 0, /* tp_getattr */ + 0, /* tp_setattr */ + 0, /* tp_compare */ + 0, /* tp_repr */ + 0, /* tp_as_number */ + 0, /* tp_as_sequence */ + 0, /* tp_as_mapping */ + 0, /* tp_hash */ + 0, /* tp_call */ + 0, /* tp_str */ + 0, /* tp_getattro */ + 0, /* tp_setattro */ + &staticarray_as_buffer, /* tp_as_buffer */ + Py_TPFLAGS_DEFAULT, /* tp_flags */ + 0, /* tp_doc */ + 0, /* tp_traverse */ + 0, /* tp_clear */ + 0, /* tp_richcompare */ + 0, /* tp_weaklistoffset */ + 0, /* tp_iter */ + 0, /* tp_iternext */ + 0, /* tp_methods */ + 0, /* tp_members */ + 0, /* tp_getset */ + 0, /* tp_base */ + 0, /* tp_dict */ + 0, /* tp_descr_get */ + 0, /* tp_descr_set */ + 0, /* tp_dictoffset */ + staticarray_init, /* tp_init */ + 0, /* tp_alloc */ + staticarray_new, /* tp_new */ +}; + static struct PyMethodDef _testbuffer_functions[] = { {"slice_indices", slice_indices, METH_VARARGS, NULL}, @@ -2634,10 +2754,14 @@ PyInit__testbuffer(void) if (m == NULL) return NULL; - Py_TYPE(&NDArray_Type)=&PyType_Type; + Py_TYPE(&NDArray_Type) = &PyType_Type; Py_INCREF(&NDArray_Type); PyModule_AddObject(m, "ndarray", (PyObject *)&NDArray_Type); + Py_TYPE(&StaticArray_Type) = &PyType_Type; + Py_INCREF(&StaticArray_Type); + PyModule_AddObject(m, "staticarray", (PyObject *)&StaticArray_Type); + structmodule = PyImport_ImportModule("struct"); if (structmodule == NULL) return NULL; -- cgit v0.12