mirror of
https://github.com/pybind/pybind11.git
synced 2024-12-01 17:37:15 +00:00
59 lines
2.0 KiB
C++
59 lines
2.0 KiB
C++
// Demonstration of Undefined Behavior in handling of shared_ptr holder,
|
|
// specifically:
|
|
// https://github.com/pybind/pybind11/blob/30eb39ed79d1e2eeff15219ac00773034300a5e6/include/pybind11/cast.h#L235
|
|
// `return reinterpret_cast<H &>(vh[1]);`
|
|
// indirectly casts a `shared_ptr<drvd>` reference to a `shared_ptr<base>`.
|
|
// Similarly:
|
|
// https://github.com/pybind/pybind11/blob/30eb39ed79d1e2eeff15219ac00773034300a5e6/include/pybind11/pybind11.h#L1505
|
|
// `init_holder(inst, v_h, (const holder_type *) holder_ptr, v_h.value_ptr<type>());`
|
|
// explictly casts a `shared_ptr<base>` reference to a `shared_ptr<drvd>`.
|
|
// Both tests in `test_smart_ptr_private_first_base.py` fail with a
|
|
// Segmentation Fault (Linux, clang++ -std=c++17).
|
|
|
|
#include <memory>
|
|
|
|
#include "pybind11_tests.h"
|
|
|
|
namespace pybind11_tests {
|
|
namespace smart_ptr_private_first_base {
|
|
|
|
struct base {
|
|
base() : base_id(100) {}
|
|
virtual ~base() = default;
|
|
virtual int id() const { return base_id; }
|
|
int base_id;
|
|
};
|
|
|
|
struct private_first_base { // Any class with a virtual function will do.
|
|
virtual void some_other_virtual_function() const {}
|
|
virtual ~private_first_base() = default;
|
|
};
|
|
|
|
struct drvd : private private_first_base, public base {
|
|
int id() const override { return 2 * base_id; }
|
|
};
|
|
|
|
inline std::shared_ptr<drvd> make_shared_drvd() {
|
|
return std::shared_ptr<drvd>(new drvd);
|
|
}
|
|
|
|
inline std::shared_ptr<base> make_shared_drvd_up_cast() {
|
|
return std::shared_ptr<base>(new drvd);
|
|
}
|
|
|
|
inline int pass_shared_base(std::shared_ptr<base> b) { return b->id(); }
|
|
inline int pass_shared_drvd(std::shared_ptr<drvd> d) { return d->id(); }
|
|
|
|
TEST_SUBMODULE(smart_ptr_private_first_base, m) {
|
|
py::class_<base, std::shared_ptr<base>>(m, "base");
|
|
py::class_<drvd, base, std::shared_ptr<drvd>>(m, "drvd");
|
|
|
|
m.def("make_shared_drvd", make_shared_drvd);
|
|
m.def("make_shared_drvd_up_cast", make_shared_drvd_up_cast);
|
|
m.def("pass_shared_base", pass_shared_base);
|
|
m.def("pass_shared_drvd", pass_shared_drvd);
|
|
}
|
|
|
|
} // namespace smart_ptr_private_first_base
|
|
} // namespace pybind11_tests
|