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Insert PYBIND11_SMART_HOLDER_PADDING (with the idea to catch undefined behavior sooner rather than later).

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Ralf W. Grosse-Kunstleve 2024-07-02 10:57:25 -07:00
parent 9e3cdf7f72
commit c92b4d86da
1 changed files with 15 additions and 0 deletions
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15
include/pybind11/detail/smart_holder_poc.h
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@ -138,15 +138,30 @@ inline bool is_std_default_delete(const std::type_info &rtti_deleter) {
|| rtti_deleter == typeid(std::default_delete<T const>);
}
#ifndef NDEBUG
# define PYBIND11_SMART_HOLDER_PADDING(N) int PADDING_##N##_[11]
#else
# define PYBIND11_SMART_HOLDER_PADDING(N)
#endif
struct smart_holder {
PYBIND11_SMART_HOLDER_PADDING(1);
const std::type_info *rtti_uqp_del = nullptr;
PYBIND11_SMART_HOLDER_PADDING(2);
std::shared_ptr<void> vptr;
PYBIND11_SMART_HOLDER_PADDING(3);
bool vptr_is_using_noop_deleter : 1;
PYBIND11_SMART_HOLDER_PADDING(4);
bool vptr_is_using_builtin_delete : 1;
PYBIND11_SMART_HOLDER_PADDING(5);
bool vptr_is_external_shared_ptr : 1;
PYBIND11_SMART_HOLDER_PADDING(6);
bool is_populated : 1;
PYBIND11_SMART_HOLDER_PADDING(7);
bool is_disowned : 1;
PYBIND11_SMART_HOLDER_PADDING(8);
bool pointee_depends_on_holder_owner : 1; // SMART_HOLDER_WIP: See PR #2839.
PYBIND11_SMART_HOLDER_PADDING(9);
// Design choice: smart_holder is movable but not copyable.
smart_holder(smart_holder &&) = default;