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WIP snapshot: replacing std::shared_ptr<bool> flag_ptr with simple bool armed_flag.

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Ralf W. Grosse-Kunstleve 2021-06-16 09:07:20 -07:00 committed by Ralf W. Grosse-Kunstleve
parent 459301d9a8
commit 362e64e1ca
1 changed files with 28 additions and 21 deletions
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49
include/pybind11/detail/smart_holder_poc.h
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@ -57,26 +57,24 @@ namespace pybindit {
namespace memory {
struct guarded_operator_call {
std::shared_ptr<bool> flag_ptr;
explicit guarded_operator_call(std::shared_ptr<bool> armed_flag_ptr)
: flag_ptr{armed_flag_ptr} {}
bool armed_flag;
explicit guarded_operator_call(bool armed_flag) : armed_flag{armed_flag} {}
virtual void operator()(void *) = 0;
virtual ~guarded_operator_call() = default;
guarded_operator_call(guarded_operator_call &&) = default;
guarded_operator_call(guarded_operator_call &) = delete;
guarded_operator_call(guarded_operator_call &) = default;
guarded_operator_call &operator=(guarded_operator_call &&) = delete;
guarded_operator_call &operator=(const guarded_operator_call &) = delete;
};
template <typename T>
struct guarded_builtin_delete : guarded_operator_call {
explicit guarded_builtin_delete(std::shared_ptr<bool> armed_flag_ptr)
: guarded_operator_call(armed_flag_ptr) {}
explicit guarded_builtin_delete(bool armed_flag) : guarded_operator_call{armed_flag} {}
void operator()(void *raw_ptr) override { delete_impl<T>(raw_ptr); }
template <typename T_ = T,
typename std::enable_if<std::is_destructible<T_>::value, int>::type = 0>
void delete_impl(void *raw_ptr) {
if (*flag_ptr)
if (armed_flag)
delete (T *) raw_ptr;
}
template <typename T_ = T,
@ -109,10 +107,9 @@ guarded_delete make_guarded_builtin_delete(bool armed_flag) {
template <typename T, typename D>
struct guarded_custom_deleter : guarded_operator_call {
explicit guarded_custom_deleter(std::shared_ptr<bool> armed_flag_ptr)
: guarded_operator_call(armed_flag_ptr) {}
explicit guarded_custom_deleter(bool armed_flag) : guarded_operator_call{armed_flag} {}
virtual void operator()(void *raw_ptr) override {
if (*flag_ptr)
if (armed_flag)
D()((T *) raw_ptr);
}
};
@ -125,6 +122,7 @@ inline bool is_std_default_delete(const std::type_info &rtti_deleter) {
struct smart_holder {
const std::type_info *rtti_uqp_del = nullptr;
guarded_operator_call *vptr_del = nullptr;
std::shared_ptr<void> vptr;
bool vptr_is_using_noop_deleter : 1;
bool vptr_is_using_builtin_delete : 1;
@ -228,7 +226,8 @@ struct smart_holder {
template <typename T>
static smart_holder from_raw_ptr_unowned(T *raw_ptr) {
smart_holder hld;
hld.vptr.reset(raw_ptr, [](void *) {});
hld.vptr.reset(raw_ptr, guarded_builtin_delete<T>(false));
hld.vptr_del = std::get_deleter<guarded_builtin_delete<T>>(hld.vptr);
hld.vptr_is_using_noop_deleter = true;
hld.is_populated = true;
return hld;
@ -259,12 +258,21 @@ struct smart_holder {
static smart_holder from_raw_ptr_take_ownership(T *raw_ptr) {
ensure_pointee_is_destructible<T>("from_raw_ptr_take_ownership");
smart_holder hld;
hld.vptr.reset(raw_ptr, make_guarded_builtin_delete<T>(true));
hld.vptr.reset(raw_ptr, guarded_builtin_delete<T>(true));
hld.vptr_del = std::get_deleter<guarded_builtin_delete<T>>(hld.vptr);
hld.vptr_is_using_builtin_delete = true;
hld.is_populated = true;
return hld;
}
void reset_vptr_deleter_armed_flag(bool armed_flag) {
if (vptr_del == nullptr) {
throw std::runtime_error(
"smart_holder::reset_vptr_deleter_armed_flag() called in an invalid context.");
}
vptr_del->armed_flag = armed_flag;
}
// Caller is responsible for ensuring preconditions (SMART_HOLDER_WIP: details).
void disown() {
reset_vptr_deleter_armed_flag(false);
@ -278,7 +286,10 @@ struct smart_holder {
}
// Caller is responsible for ensuring preconditions (SMART_HOLDER_WIP: details).
void release_disowned() { vptr.reset(); }
void release_disowned() {
vptr.reset();
vptr_del = nullptr;
}
// SMART_HOLDER_WIP: review this function.
void ensure_can_release_ownership(const char *context = "ensure_can_release_ownership") const {
@ -306,17 +317,13 @@ struct smart_holder {
smart_holder hld;
hld.rtti_uqp_del = &typeid(D);
hld.vptr_is_using_builtin_delete = is_std_default_delete<T>(*hld.rtti_uqp_del);
guarded_operator_call *vptr_del = nullptr;
if (hld.vptr_is_using_builtin_delete) {
hld.vptr.reset(unq_ptr.get(),
guarded_builtin_delete<T>(hld.vptr_deleter_armed_flag_ptr));
vptr_del = std::get_deleter<guarded_builtin_delete<T>>(hld.vptr);
hld.vptr.reset(unq_ptr.get(), guarded_builtin_delete<T>(true));
hld.vptr_del = std::get_deleter<guarded_builtin_delete<T>>(hld.vptr);
} else {
hld.vptr.reset(unq_ptr.get(),
guarded_custom_deleter<T, D>(hld.vptr_deleter_armed_flag_ptr));
vptr_del = std::get_deleter<guarded_custom_deleter<T, D>>(hld.vptr);
hld.vptr.reset(unq_ptr.get(), guarded_custom_deleter<T, D>(true));
hld.vptr_del = std::get_deleter<guarded_custom_deleter<T, D>>(hld.vptr);
}
assert(vptr_del != nullptr);
unq_ptr.release();
hld.is_populated = true;
return hld;