mirror of
https://github.com/pybind/pybind11.git
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e8ad33bb30
* tests: New test for ctypes buffers (pybind#2502) * fix: fix buffer_info segfault on views with no stride (pybind11#2502) * Explicit conversions in buffer_info to make clang happy (pybind#2502) * Another explicit cast in buffer_info constructor for clang (pybind#2502) * Simpler implementation of buffer_info constructor from Py_buffer. * Move test_ctypes_buffer into test_buffers * Comment on why view->strides may be NULL (and fix some whitespace) * Use c_strides() instead of zero when view->strides is NULL. c_strides and f_strides are moved from numpy.h (py::array) to buffer_info.h (py::detail) so they can be used from the buffer_info Py_buffer constructor. * Increase ctypes buffer test coverage in test_buffers. * Split ctypes tests and skip one which is broken in PyPy2.
163 lines
4.8 KiB
Python
163 lines
4.8 KiB
Python
# -*- coding: utf-8 -*-
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import io
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import struct
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import ctypes
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import pytest
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import env # noqa: F401
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from pybind11_tests import buffers as m
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from pybind11_tests import ConstructorStats
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np = pytest.importorskip("numpy")
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def test_from_python():
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with pytest.raises(RuntimeError) as excinfo:
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m.Matrix(np.array([1, 2, 3])) # trying to assign a 1D array
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assert str(excinfo.value) == "Incompatible buffer format!"
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m3 = np.array([[1, 2, 3], [4, 5, 6]]).astype(np.float32)
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m4 = m.Matrix(m3)
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for i in range(m4.rows()):
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for j in range(m4.cols()):
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assert m3[i, j] == m4[i, j]
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cstats = ConstructorStats.get(m.Matrix)
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assert cstats.alive() == 1
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del m3, m4
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assert cstats.alive() == 0
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assert cstats.values() == ["2x3 matrix"]
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assert cstats.copy_constructions == 0
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# assert cstats.move_constructions >= 0 # Don't invoke any
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assert cstats.copy_assignments == 0
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assert cstats.move_assignments == 0
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# https://foss.heptapod.net/pypy/pypy/-/issues/2444
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def test_to_python():
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mat = m.Matrix(5, 4)
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assert memoryview(mat).shape == (5, 4)
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assert mat[2, 3] == 0
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mat[2, 3] = 4.0
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mat[3, 2] = 7.0
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assert mat[2, 3] == 4
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assert mat[3, 2] == 7
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assert struct.unpack_from('f', mat, (3 * 4 + 2) * 4) == (7, )
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assert struct.unpack_from('f', mat, (2 * 4 + 3) * 4) == (4, )
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mat2 = np.array(mat, copy=False)
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assert mat2.shape == (5, 4)
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assert abs(mat2).sum() == 11
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assert mat2[2, 3] == 4 and mat2[3, 2] == 7
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mat2[2, 3] = 5
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assert mat2[2, 3] == 5
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cstats = ConstructorStats.get(m.Matrix)
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assert cstats.alive() == 1
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del mat
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pytest.gc_collect()
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assert cstats.alive() == 1
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del mat2 # holds a mat reference
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pytest.gc_collect()
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assert cstats.alive() == 0
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assert cstats.values() == ["5x4 matrix"]
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assert cstats.copy_constructions == 0
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# assert cstats.move_constructions >= 0 # Don't invoke any
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assert cstats.copy_assignments == 0
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assert cstats.move_assignments == 0
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def test_inherited_protocol():
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"""SquareMatrix is derived from Matrix and inherits the buffer protocol"""
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matrix = m.SquareMatrix(5)
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assert memoryview(matrix).shape == (5, 5)
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assert np.asarray(matrix).shape == (5, 5)
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def test_pointer_to_member_fn():
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for cls in [m.Buffer, m.ConstBuffer, m.DerivedBuffer]:
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buf = cls()
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buf.value = 0x12345678
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value = struct.unpack('i', bytearray(buf))[0]
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assert value == 0x12345678
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def test_readonly_buffer():
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buf = m.BufferReadOnly(0x64)
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view = memoryview(buf)
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assert view[0] == b'd' if env.PY2 else 0x64
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assert view.readonly
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def test_selective_readonly_buffer():
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buf = m.BufferReadOnlySelect()
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memoryview(buf)[0] = b'd' if env.PY2 else 0x64
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assert buf.value == 0x64
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io.BytesIO(b'A').readinto(buf)
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assert buf.value == ord(b'A')
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buf.readonly = True
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with pytest.raises(TypeError):
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memoryview(buf)[0] = b'\0' if env.PY2 else 0
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with pytest.raises(TypeError):
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io.BytesIO(b'1').readinto(buf)
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def test_ctypes_array_1d():
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char1d = (ctypes.c_char * 10)()
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int1d = (ctypes.c_int * 15)()
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long1d = (ctypes.c_long * 7)()
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for carray in (char1d, int1d, long1d):
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info = m.get_buffer_info(carray)
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assert info.itemsize == ctypes.sizeof(carray._type_)
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assert info.size == len(carray)
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assert info.ndim == 1
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assert info.shape == [info.size]
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assert info.strides == [info.itemsize]
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assert not info.readonly
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def test_ctypes_array_2d():
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char2d = ((ctypes.c_char * 10) * 4)()
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int2d = ((ctypes.c_int * 15) * 3)()
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long2d = ((ctypes.c_long * 7) * 2)()
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for carray in (char2d, int2d, long2d):
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info = m.get_buffer_info(carray)
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assert info.itemsize == ctypes.sizeof(carray[0]._type_)
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assert info.size == len(carray) * len(carray[0])
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assert info.ndim == 2
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assert info.shape == [len(carray), len(carray[0])]
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assert info.strides == [info.itemsize * len(carray[0]), info.itemsize]
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assert not info.readonly
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@pytest.mark.skipif(
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"env.PYPY and env.PY2", reason="PyPy2 bytes buffer not reported as readonly"
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)
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def test_ctypes_from_buffer():
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test_pystr = b"0123456789"
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for pyarray in (test_pystr, bytearray(test_pystr)):
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pyinfo = m.get_buffer_info(pyarray)
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if pyinfo.readonly:
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cbytes = (ctypes.c_char * len(pyarray)).from_buffer_copy(pyarray)
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cinfo = m.get_buffer_info(cbytes)
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else:
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cbytes = (ctypes.c_char * len(pyarray)).from_buffer(pyarray)
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cinfo = m.get_buffer_info(cbytes)
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assert cinfo.size == pyinfo.size
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assert cinfo.ndim == pyinfo.ndim
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assert cinfo.shape == pyinfo.shape
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assert cinfo.strides == pyinfo.strides
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assert not cinfo.readonly
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