mirror of
https://github.com/pybind/pybind11.git
synced 2024-11-23 13:45:10 +00:00
62 lines
2.5 KiB
C
62 lines
2.5 KiB
C
// Copyright (c) 2021 The Pybind Development Team.
|
|
// All rights reserved. Use of this source code is governed by a
|
|
// BSD-style license that can be found in the LICENSE file.
|
|
|
|
#pragma once
|
|
|
|
#include "detail/common.h"
|
|
#include "detail/smart_holder_poc.h"
|
|
#include "detail/type_caster_base.h"
|
|
|
|
PYBIND11_NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
|
|
|
|
PYBIND11_NAMESPACE_BEGIN(detail)
|
|
// SMART_HOLDER_WIP: Needs refactoring of existing pybind11 code.
|
|
inline bool deregister_instance(instance *self, void *valptr, const type_info *tinfo);
|
|
PYBIND11_NAMESPACE_END(detail)
|
|
|
|
// The original core idea for this struct goes back to PyCLIF:
|
|
// https://github.com/google/clif/blob/07f95d7e69dca2fcf7022978a55ef3acff506c19/clif/python/runtime.cc#L37
|
|
// URL provided here mainly to give proper credit. To fully explain the `HoldPyObj` feature, more
|
|
// context is needed (SMART_HOLDER_WIP).
|
|
struct trampoline_self_life_support {
|
|
detail::value_and_holder v_h;
|
|
|
|
trampoline_self_life_support() = default;
|
|
|
|
void activate_life_support(const detail::value_and_holder &v_h_) {
|
|
Py_INCREF((PyObject *) v_h_.inst);
|
|
v_h = v_h_;
|
|
}
|
|
|
|
void deactivate_life_support() {
|
|
Py_DECREF((PyObject *) v_h.inst);
|
|
v_h = detail::value_and_holder();
|
|
}
|
|
|
|
~trampoline_self_life_support() {
|
|
if (v_h.inst != nullptr && v_h.vh != nullptr) {
|
|
void *value_void_ptr = v_h.value_ptr();
|
|
if (value_void_ptr != nullptr) {
|
|
PyGILState_STATE threadstate = PyGILState_Ensure();
|
|
v_h.value_ptr() = nullptr;
|
|
v_h.holder<pybindit::memory::smart_holder>().release_disowned();
|
|
detail::deregister_instance(v_h.inst, value_void_ptr, v_h.type);
|
|
Py_DECREF((PyObject *) v_h.inst); // Must be after deregister.
|
|
PyGILState_Release(threadstate);
|
|
}
|
|
}
|
|
}
|
|
|
|
// For the next two, the default implementations generate undefined behavior (ASAN failures
|
|
// manually verified). The reason is that v_h needs to be kept default-initialized.
|
|
trampoline_self_life_support(const trampoline_self_life_support &) {}
|
|
trampoline_self_life_support(trampoline_self_life_support &&) noexcept {}
|
|
|
|
// These should never be needed (please provide test cases if you think they are).
|
|
trampoline_self_life_support &operator=(const trampoline_self_life_support &) = delete;
|
|
trampoline_self_life_support &operator=(trampoline_self_life_support &&) = delete;
|
|
};
|
|
|
|
PYBIND11_NAMESPACE_END(PYBIND11_NAMESPACE)
|