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import pytest
from rpython.rtyper.lltypesystem import rffi
from rpython.rlib.buffer import StringBuffer
from pypy.module.cpyext.test.test_api import BaseApiTest
from pypy.module.cpyext.test.test_cpyext import AppTestCpythonExtensionBase
from pypy.interpreter.buffer import SimpleView
from pypy.module.cpyext.pyobject import make_ref, from_ref, decref
from pypy.module.cpyext.memoryobject import PyMemoryViewObject
only_pypy ="config.option.runappdirect and '__pypy__' not in sys.builtin_module_names"
class TestMemoryViewObject(BaseApiTest):
def test_frombuffer(self, space, api):
w_view = SimpleView(StringBuffer("hello")).wrap(space)
w_memoryview = api.PyMemoryView_FromObject(w_view)
c_memoryview = rffi.cast(
PyMemoryViewObject, make_ref(space, w_memoryview))
view = c_memoryview.c_view
assert view.c_ndim == 1
f = rffi.charp2str(view.c_format)
assert f == 'B'
assert view.c_shape[0] == 5
assert view.c_strides[0] == 1
assert view.c_len == 5
o = rffi.charp2str(view.c_buf)
assert o == 'hello'
ref = api.PyMemoryView_FromBuffer(view)
w_mv = from_ref(space, ref)
for f in ('format', 'itemsize', 'ndim', 'readonly',
'shape', 'strides', 'suboffsets'):
w_f = space.wrap(f)
assert space.eq_w(space.getattr(w_mv, w_f),
space.getattr(w_memoryview, w_f))
decref(space, ref)
decref(space, c_memoryview)
class AppTestPyBuffer_FillInfo(AppTestCpythonExtensionBase):
def test_fillWithObject(self):
module = self.import_extension('foo', [
("fillinfo", "METH_VARARGS",
"""
Py_buffer buf;
PyObject * ret = NULL;
PyObject *str = PyBytes_FromString("hello, world.");
if (PyBuffer_FillInfo(&buf, str, PyBytes_AsString(str), 13,
0, 0)) {
return NULL;
}
/* Get rid of our own reference to the object, but
* the Py_buffer should still have a reference.
*/
Py_DECREF(str);
ret = PyMemoryView_FromBuffer(&buf);
if (((PyMemoryViewObject*)ret)->view.obj != buf.obj)
{
PyErr_SetString(PyExc_ValueError, "leaked ref");
Py_DECREF(ret);
return NULL;
}
return ret;
""")])
result = module.fillinfo()
assert b"hello, world." == result
@pytest.mark.skip(reason="segfaults on linux buildslave")
def test_0d(self):
module = self.import_extension('foo', [
("create_view", "METH_VARARGS",
"""
/* Create an approximation of the buffer for a 0d ndarray */
Py_buffer buf;
PyObject *ret, *str = PyBytes_FromString("hello, world.");
buf.buf = PyBytes_AsString(str);
buf.obj = str;
buf.readonly = 1;
buf.len = 13;
buf.itemsize = 13;
buf.ndim = 0;
buf.shape = NULL;
ret = PyMemoryView_FromBuffer(&buf);
return ret;
""")])
result = module.create_view()
assert result.shape == ()
assert result.itemsize == 13
assert result.tobytes() == b'hello, world.'
class AppTestBufferProtocol(AppTestCpythonExtensionBase):
def test_fromobject(self):
foo = self.import_extension('foo', [
("make_view", "METH_O",
"""
if (!PyObject_CheckBuffer(args))
return Py_None;
return PyMemoryView_FromObject(args);
""")])
hello = b'hello'
mview = foo.make_view(hello)
assert mview[0] == hello[0]
assert mview.tobytes() == hello
def test_buffer_protocol_app(self):
module = self.import_module(name='buffer_test')
arr = module.PyMyArray(10)
y = memoryview(arr)
assert y.format == 'i'
assert y.shape == (10,)
assert len(y) == 10
s = y[3]
assert s == 3
def test_buffer_protocol_capi(self):
foo = self.import_extension('foo', [
("get_len", "METH_VARARGS",
"""
Py_buffer view;
PyObject* obj = PyTuple_GetItem(args, 0);
long ret, vlen;
memset(&view, 0, sizeof(Py_buffer));
ret = PyObject_GetBuffer(obj, &view, PyBUF_FULL_RO);
if (ret != 0)
return NULL;
vlen = view.len / view.itemsize;
PyBuffer_Release(&view);
return PyLong_FromLong(vlen);
"""),
("test_buffer", "METH_VARARGS",
"""
Py_buffer* view = NULL;
PyObject* obj = PyTuple_GetItem(args, 0);
PyObject* memoryview = PyMemoryView_FromObject(obj);
if (memoryview == NULL)
return NULL;
view = PyMemoryView_GET_BUFFER(memoryview);
Py_DECREF(memoryview);
return PyLong_FromLong(view->len / view->itemsize);
"""),
("test_contiguous", "METH_O",
"""
Py_buffer* view;
PyObject * memoryview;
void * buf = NULL;
int ret;
Py_ssize_t len;
memoryview = PyMemoryView_FromObject(args);
if (memoryview == NULL)
return NULL;
view = PyMemoryView_GET_BUFFER(memoryview);
Py_DECREF(memoryview);
len = view->len;
if (len == 0)
return NULL;
buf = malloc(len);
ret = PyBuffer_ToContiguous(buf, view, view->len, 'A');
if (ret != 0)
{
free(buf);
return NULL;
}
ret = PyBuffer_FromContiguous(view, buf, view->len, 'A');
free(buf);
if (ret != 0)
return NULL;
Py_RETURN_NONE;
"""),
])
module = self.import_module(name='buffer_test')
arr = module.PyMyArray(10)
ten = foo.get_len(arr)
assert ten == 10
ten = foo.get_len(b'1234567890')
assert ten == 10
ten = foo.test_buffer(arr)
assert ten == 10
foo.test_contiguous(arr)
def test_releasebuffer(self):
module = self.import_extension('foo', [
("create_test", "METH_NOARGS",
"""
PyObject *obj;
obj = PyObject_New(PyObject, (PyTypeObject*)type);
return obj;
"""),
("get_cnt", "METH_NOARGS",
'return PyLong_FromLong(cnt);'),
("get_dealloc_cnt", "METH_NOARGS",
'return PyLong_FromLong(dealloc_cnt);'),
],
prologue="""
static float test_data = 42.f;
static int cnt=0;
static int dealloc_cnt=0;
static PyHeapTypeObject * type=NULL;
void dealloc(PyObject *self) {
dealloc_cnt++;
}
int getbuffer(PyObject *obj, Py_buffer *view, int flags) {
cnt ++;
memset(view, 0, sizeof(Py_buffer));
view->obj = obj;
/* see the CPython docs for why we need this incref:
https://docs.python.org/3.5/c-api/typeobj.html#c.PyBufferProcs.bf_getbuffer */
Py_INCREF(obj);
view->ndim = 0;
view->buf = (void *) &test_data;
view->itemsize = sizeof(float);
view->len = 1;
view->strides = NULL;
view->shape = NULL;
view->format = "f";
return 0;
}
void releasebuffer(PyObject *obj, Py_buffer *view) {
cnt --;
}
""", more_init="""
type = (PyHeapTypeObject *) PyType_Type.tp_alloc(&PyType_Type, 0);
type->ht_type.tp_name = "Test";
type->ht_type.tp_basicsize = sizeof(PyObject);
type->ht_name = PyUnicode_FromString("Test");
type->ht_type.tp_flags |= Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE |
Py_TPFLAGS_HEAPTYPE;
type->ht_type.tp_flags &= ~Py_TPFLAGS_HAVE_GC;
type->ht_type.tp_dealloc = dealloc;
type->ht_type.tp_as_buffer = &type->as_buffer;
type->as_buffer.bf_getbuffer = getbuffer;
type->as_buffer.bf_releasebuffer = releasebuffer;
if (PyType_Ready(&type->ht_type) < 0) INITERROR;
""", )
import gc
assert module.get_cnt() == 0
a = memoryview(module.create_test())
assert module.get_cnt() == 1
assert module.get_dealloc_cnt() == 0
del a
self.debug_collect()
assert module.get_cnt() == 0
assert module.get_dealloc_cnt() == 1
def test_FromMemory(self):
module = self.import_extension('foo', [
('new', 'METH_NOARGS', """
static char s[5] = "hello";
return PyMemoryView_FromMemory(s, 4, PyBUF_READ);
""")])
mv = module.new()
assert mv.tobytes() == b'hell'
def test_FromBuffer_NULL(self):
module = self.import_extension('foo', [
('new', 'METH_NOARGS', """
Py_buffer info;
if (PyBuffer_FillInfo(&info, NULL, NULL, 1, 1, PyBUF_FULL_RO) < 0)
return NULL;
return PyMemoryView_FromBuffer(&info);
""")])
raises(ValueError, module.new)
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