61 lines
2.4 KiB
C
61 lines
2.4 KiB
C
// Copyright (c) 2021 The Pybind Development Team.
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// All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#pragma once
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#include "detail/common.h"
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#include "detail/using_smart_holder.h"
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#include "detail/value_and_holder.h"
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PYBIND11_NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
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PYBIND11_NAMESPACE_BEGIN(detail)
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// PYBIND11:REMINDER: Needs refactoring of existing pybind11 code.
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inline bool deregister_instance(instance *self, void *valptr, const type_info *tinfo);
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PYBIND11_NAMESPACE_END(detail)
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// The original core idea for this struct goes back to PyCLIF:
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// https://github.com/google/clif/blob/07f95d7e69dca2fcf7022978a55ef3acff506c19/clif/python/runtime.cc#L37
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// URL provided here mainly to give proper credit.
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struct trampoline_self_life_support {
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detail::value_and_holder v_h;
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trampoline_self_life_support() = default;
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void activate_life_support(const detail::value_and_holder &v_h_) {
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Py_INCREF((PyObject *) v_h_.inst);
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v_h = v_h_;
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}
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void deactivate_life_support() {
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Py_DECREF((PyObject *) v_h.inst);
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v_h = detail::value_and_holder();
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}
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~trampoline_self_life_support() {
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if (v_h.inst != nullptr && v_h.vh != nullptr) {
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void *value_void_ptr = v_h.value_ptr();
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if (value_void_ptr != nullptr) {
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PyGILState_STATE threadstate = PyGILState_Ensure();
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v_h.value_ptr() = nullptr;
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v_h.holder<smart_holder>().release_disowned();
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detail::deregister_instance(v_h.inst, value_void_ptr, v_h.type);
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Py_DECREF((PyObject *) v_h.inst); // Must be after deregister.
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PyGILState_Release(threadstate);
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}
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}
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}
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// For the next two, the default implementations generate undefined behavior (ASAN failures
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// manually verified). The reason is that v_h needs to be kept default-initialized.
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trampoline_self_life_support(const trampoline_self_life_support &) {}
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trampoline_self_life_support(trampoline_self_life_support &&) noexcept {}
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// These should never be needed (please provide test cases if you think they are).
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trampoline_self_life_support &operator=(const trampoline_self_life_support &) = delete;
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trampoline_self_life_support &operator=(trampoline_self_life_support &&) = delete;
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};
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PYBIND11_NAMESPACE_END(PYBIND11_NAMESPACE)
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