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68 lines
2.8 KiB
Python
68 lines
2.8 KiB
Python
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# This is not really a unit test, but probing environment/toolchain/platform-specific
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# behavior under the exact same conditions as normal tests.
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# The results are useful to understanding the effects of, e.g., removing
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# `-fvisibility=hidden` or `__attribute__((visibility("hidden")))`, or linking
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# extensions statically with the core Python interpreter.
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# NOTE
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# ====
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# The "exc_" in "test_exc_namespace_visibility.py" is a workaround, to avoid a
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# test_cross_module_exception_translator (test_exceptions.py) failure. This
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# test has to be imported (by pytest) before test_exceptions.py; pytest sorts
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# lexically. See https://github.com/pybind/pybind11/pull/4054 for more information.
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import itertools
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import namespace_visibility_1
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import namespace_visibility_2
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import pytest
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# Please take a quick look at namespace_visibility.h first, to see what is being probed.
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#
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# EXPECTED is for -fvisibility=hidden or equivalent, as recommended in the docs.
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EXPECTED_ALL_UNIQUE_POINTERS_OBSERVED = "AAC:AAc:AaC:Aac:aAC:aAc:aaC:aac"
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# ^^^
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# namespace_visibility_1 pointer|||
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# namespace_visibility_1.submodule pointer|| (identical letters means same pointer)
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# namespace_visibility_2 pointer|
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# Upper-case: namespace visibility unspecified
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# Lower-case: namespace visibility hidden
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# This test probes all 2**3 combinations of u/h ** number-of-sub/modules.
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#
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# Also observed:
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# AAA:AAc:AaC:Aac:aAC:aAc:aaC:aac -fvisibility=default Linux
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# AAA:AAc:AaA:Aac:aAC:aAc:aaC:aac -fvisibility=default macOS
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# AAA:AAa:AaA:Aaa:aAA:aAa:aaA:aaa everything linked statically
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def test_namespace_visibility():
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modules = (
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namespace_visibility_1,
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namespace_visibility_1.submodule,
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namespace_visibility_2,
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)
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unique_pointer_labels = "ABC"
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unique_pointers_observed = []
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# u = visibility unspecified
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# h = visibility hidden
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for visibility in itertools.product(*([("u", "h")] * len(modules))):
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# See functions in namespace_visibility_*.cpp
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func = "ns_vis_" + "".join(visibility) + "_func"
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ptrs = []
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uq_ptrs_obs = ""
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for vis, m in zip(visibility, modules):
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ptr = getattr(m, func)()
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ptrs.append(ptr)
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lbl = unique_pointer_labels[ptrs.index(ptr)]
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if vis == "h":
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# Encode u/h info as upper/lower case to make the final result
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# as compact as possible.
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lbl = lbl.lower()
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uq_ptrs_obs += lbl
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unique_pointers_observed.append(uq_ptrs_obs)
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all_unique_pointers_observed = ":".join(unique_pointers_observed)
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if all_unique_pointers_observed != EXPECTED_ALL_UNIQUE_POINTERS_OBSERVED:
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pytest.skip(
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f"UNUSUAL all_unique_pointers_observed: {all_unique_pointers_observed}"
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)
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