mirror of https://github.com/pybind/pybind11.git
59 lines
2.0 KiB
C++
59 lines
2.0 KiB
C++
// Demonstration of Undefined Behavior in handling of shared_ptr holder,
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// specifically:
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// https://github.com/pybind/pybind11/blob/30eb39ed79d1e2eeff15219ac00773034300a5e6/include/pybind11/cast.h#L235
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// `return reinterpret_cast<H &>(vh[1]);`
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// indirectly casts a `shared_ptr<drvd>` reference to a `shared_ptr<base>`.
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// Similarly:
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// https://github.com/pybind/pybind11/blob/30eb39ed79d1e2eeff15219ac00773034300a5e6/include/pybind11/pybind11.h#L1505
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// `init_holder(inst, v_h, (const holder_type *) holder_ptr, v_h.value_ptr<type>());`
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// explictly casts a `shared_ptr<base>` reference to a `shared_ptr<drvd>`.
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// Both tests in `test_smart_ptr_private_first_base.py` fail with a
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// Segmentation Fault (Linux, clang++ -std=c++17).
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#include <memory>
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#include "pybind11_tests.h"
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namespace pybind11_tests {
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namespace smart_ptr_private_first_base {
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struct base {
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base() : base_id(100) {}
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virtual ~base() = default;
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virtual int id() const { return base_id; }
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int base_id;
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};
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struct private_first_base { // Any class with a virtual function will do.
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virtual void some_other_virtual_function() const {}
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virtual ~private_first_base() = default;
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};
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struct drvd : private private_first_base, public base {
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int id() const override { return 2 * base_id; }
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};
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inline std::shared_ptr<drvd> make_shared_drvd() {
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return std::shared_ptr<drvd>(new drvd);
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}
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inline std::shared_ptr<base> make_shared_drvd_up_cast() {
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return std::shared_ptr<base>(new drvd);
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}
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inline int pass_shared_base(std::shared_ptr<base> b) { return b->id(); }
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inline int pass_shared_drvd(std::shared_ptr<drvd> d) { return d->id(); }
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TEST_SUBMODULE(smart_ptr_private_first_base, m) {
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py::class_<base, std::shared_ptr<base>>(m, "base");
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py::class_<drvd, base, std::shared_ptr<drvd>>(m, "drvd");
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m.def("make_shared_drvd", make_shared_drvd);
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m.def("make_shared_drvd_up_cast", make_shared_drvd_up_cast);
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m.def("pass_shared_base", pass_shared_base);
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m.def("pass_shared_drvd", pass_shared_drvd);
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}
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} // namespace smart_ptr_private_first_base
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} // namespace pybind11_tests
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