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Experiment: effectively undoing all shared_from_this modifications.

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Ralf W. Grosse-Kunstleve 2021-06-03 21:10:34 -07:00 committed by Ralf W. Grosse-Kunstleve
parent 6989f174ac
commit 715ceb4bf3
1 changed files with 22 additions and 9 deletions
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31
include/pybind11/detail/smart_holder_type_casters.h
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@ -26,6 +26,11 @@
#include <typeinfo> #include <typeinfo>
#include <utility> #include <utility>
#ifdef JUNK
# include <iostream>
inline void to_cout(std::string msg) { std::cout << msg << std::endl; }
#endif
PYBIND11_NAMESPACE_BEGIN(PYBIND11_NAMESPACE) PYBIND11_NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
using pybindit::memory::smart_holder; using pybindit::memory::smart_holder;
@ -277,6 +282,7 @@ struct smart_holder_type_caster_class_hooks : smart_holder_type_caster_base_tag
return false; return false;
} }
#ifdef JUNK
template <typename WrappedType, typename AnyBaseOfWrappedType> template <typename WrappedType, typename AnyBaseOfWrappedType>
static bool try_initialization_using_shared_from_this( static bool try_initialization_using_shared_from_this(
holder_type *uninitialized_location, holder_type *uninitialized_location,
@ -290,6 +296,7 @@ struct smart_holder_type_caster_class_hooks : smart_holder_type_caster_base_tag
new (uninitialized_location) holder_type(holder_type::from_shared_ptr(shd_ptr)); new (uninitialized_location) holder_type(holder_type::from_shared_ptr(shd_ptr));
return true; return true;
} }
#endif
template <typename WrappedType, typename AliasType> template <typename WrappedType, typename AliasType>
static void init_instance_for_type(detail::instance *inst, const void *holder_const_void_ptr) { static void init_instance_for_type(detail::instance *inst, const void *holder_const_void_ptr) {
@ -302,26 +309,26 @@ struct smart_holder_type_caster_class_hooks : smart_holder_type_caster_base_tag
register_instance(inst, v_h.value_ptr(), v_h.type); register_instance(inst, v_h.value_ptr(), v_h.type);
v_h.set_instance_registered(); v_h.set_instance_registered();
} }
auto uninitialized_location = std::addressof(v_h.holder<holder_type>());
auto value_ptr_w_t = v_h.value_ptr<WrappedType>();
if (holder_void_ptr) { if (holder_void_ptr) {
// Note: inst->owned ignored. // Note: inst->owned ignored.
auto holder_ptr = static_cast<holder_type *>(holder_void_ptr); auto holder_ptr = static_cast<holder_type *>(holder_void_ptr);
new (uninitialized_location) holder_type(std::move(*holder_ptr)); new (std::addressof(v_h.holder<holder_type>())) holder_type(std::move(*holder_ptr));
} else { } else {
if (!try_initialization_using_shared_from_this( if (!try_initialization_using_shared_from_this(
uninitialized_location, value_ptr_w_t, value_ptr_w_t)) { std::addressof(v_h.holder<holder_type>()),
v_h.value_ptr<WrappedType>(),
v_h.value_ptr<WrappedType>())) {
if (inst->owned) { if (inst->owned) {
new (uninitialized_location) new (std::addressof(v_h.holder<holder_type>())) holder_type(
holder_type(holder_type::from_raw_ptr_take_ownership(value_ptr_w_t)); holder_type::from_raw_ptr_take_ownership(v_h.value_ptr<WrappedType>()));
} else { } else {
new (uninitialized_location) new (std::addressof(v_h.holder<holder_type>())) holder_type(
holder_type(holder_type::from_raw_ptr_unowned(value_ptr_w_t)); holder_type::from_raw_ptr_unowned(v_h.value_ptr<WrappedType>()));
} }
} }
} }
v_h.holder<holder_type>().pointee_depends_on_holder_owner v_h.holder<holder_type>().pointee_depends_on_holder_owner
= dynamic_raw_ptr_cast_if_possible<AliasType>(value_ptr_w_t) != nullptr; = dynamic_raw_ptr_cast_if_possible<AliasType>(v_h.value_ptr<WrappedType>()) != nullptr;
v_h.set_holder_constructed(); v_h.set_holder_constructed();
} }
@ -391,14 +398,20 @@ struct smart_holder_type_caster_load {
auto type_raw_ptr = convert_type(void_raw_ptr); auto type_raw_ptr = convert_type(void_raw_ptr);
if (holder().pointee_depends_on_holder_owner) { if (holder().pointee_depends_on_holder_owner) {
// Tie lifetime of trampoline Python part to C++ part (PR #2839). // Tie lifetime of trampoline Python part to C++ part (PR #2839).
#ifdef JUNK
to_cout("");
to_cout("LOOOK " + std::to_string(__LINE__) + " " + __FILE__);
#endif
return std::shared_ptr<T>( return std::shared_ptr<T>(
type_raw_ptr, type_raw_ptr,
shared_ptr_dec_ref_deleter{ shared_ptr_dec_ref_deleter{
handle((PyObject *) load_impl.loaded_v_h.inst).inc_ref()}); handle((PyObject *) load_impl.loaded_v_h.inst).inc_ref()});
} }
#ifdef JUNK
if (holder().vptr_is_using_noop_deleter) { if (holder().vptr_is_using_noop_deleter) {
throw std::runtime_error("Non-owning holder (loaded_as_shared_ptr)."); throw std::runtime_error("Non-owning holder (loaded_as_shared_ptr).");
} }
#endif
std::shared_ptr<void> void_shd_ptr = holder().template as_shared_ptr<void>(); std::shared_ptr<void> void_shd_ptr = holder().template as_shared_ptr<void>();
return std::shared_ptr<T>(void_shd_ptr, type_raw_ptr); return std::shared_ptr<T>(void_shd_ptr, type_raw_ptr);
} }