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numpy: fix refcount leak to dtype singleton (#1860)
PyArray_DescrFromType returns a new reference, not borrowed one
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@ -1044,7 +1044,7 @@ public:
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static pybind11::dtype dtype() {
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if (auto ptr = npy_api::get().PyArray_DescrFromType_(value))
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return reinterpret_borrow<pybind11::dtype>(ptr);
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return reinterpret_steal<pybind11::dtype>(ptr);
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pybind11_fail("Unsupported buffer format!");
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}
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};
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@ -434,3 +434,14 @@ def test_array_create_and_resize(msg):
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def test_index_using_ellipsis():
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a = m.index_using_ellipsis(np.zeros((5, 6, 7)))
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assert a.shape == (6,)
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@pytest.unsupported_on_pypy
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def test_dtype_refcount_leak():
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from sys import getrefcount
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dtype = np.dtype(np.float_)
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a = np.array([1], dtype=dtype)
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before = getrefcount(dtype)
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m.ndim(a)
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after = getrefcount(dtype)
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assert after == before
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