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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___COROUTINE_COROUTINE_HANDLE_H
#define _LIBCPP___COROUTINE_COROUTINE_HANDLE_H
#include <__assert>
#include <__config>
#include <__functional/hash.h>
#include <__memory/addressof.h>
#include <compare>
#include <type_traits>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CXX20_COROUTINES)
_LIBCPP_BEGIN_NAMESPACE_STD
// [coroutine.handle]
template <class _Promise = void>
struct _LIBCPP_TEMPLATE_VIS coroutine_handle;
template <>
struct _LIBCPP_TEMPLATE_VIS coroutine_handle<void> {
public:
// [coroutine.handle.con], construct/reset
_LIBCPP_HIDE_FROM_ABI
constexpr coroutine_handle() noexcept = default;
_LIBCPP_HIDE_FROM_ABI
constexpr coroutine_handle(nullptr_t) noexcept {}
_LIBCPP_HIDE_FROM_ABI
coroutine_handle& operator=(nullptr_t) noexcept {
__handle_ = nullptr;
return *this;
}
// [coroutine.handle.export.import], export/import
_LIBCPP_HIDE_FROM_ABI
constexpr void* address() const noexcept { return __handle_; }
_LIBCPP_HIDE_FROM_ABI
static constexpr coroutine_handle from_address(void* __addr) noexcept {
coroutine_handle __tmp;
__tmp.__handle_ = __addr;
return __tmp;
}
// [coroutine.handle.observers], observers
_LIBCPP_HIDE_FROM_ABI
constexpr explicit operator bool() const noexcept {
return __handle_ != nullptr;
}
_LIBCPP_HIDE_FROM_ABI
bool done() const {
_LIBCPP_ASSERT(__is_suspended(), "done() can be called only on suspended coroutines");
return __builtin_coro_done(__handle_);
}
// [coroutine.handle.resumption], resumption
_LIBCPP_HIDE_FROM_ABI
void operator()() const { resume(); }
_LIBCPP_HIDE_FROM_ABI
void resume() const {
_LIBCPP_ASSERT(__is_suspended(), "resume() can be called only on suspended coroutines");
_LIBCPP_ASSERT(!done(), "resume() has undefined behavior when the coroutine is done");
__builtin_coro_resume(__handle_);
}
_LIBCPP_HIDE_FROM_ABI
void destroy() const {
_LIBCPP_ASSERT(__is_suspended(), "destroy() can be called only on suspended coroutines");
__builtin_coro_destroy(__handle_);
}
private:
bool __is_suspended() const {
// FIXME actually implement a check for if the coro is suspended.
return __handle_ != nullptr;
}
void* __handle_ = nullptr;
};
// [coroutine.handle.compare]
inline _LIBCPP_HIDE_FROM_ABI
constexpr bool operator==(coroutine_handle<> __x, coroutine_handle<> __y) noexcept {
return __x.address() == __y.address();
}
inline _LIBCPP_HIDE_FROM_ABI
constexpr strong_ordering operator<=>(coroutine_handle<> __x, coroutine_handle<> __y) noexcept {
return compare_three_way()(__x.address(), __y.address());
}
template <class _Promise>
struct _LIBCPP_TEMPLATE_VIS coroutine_handle {
public:
// [coroutine.handle.con], construct/reset
_LIBCPP_HIDE_FROM_ABI
constexpr coroutine_handle() noexcept = default;
_LIBCPP_HIDE_FROM_ABI
constexpr coroutine_handle(nullptr_t) noexcept {}
_LIBCPP_HIDE_FROM_ABI
static coroutine_handle from_promise(_Promise& __promise) {
using _RawPromise = typename remove_cv<_Promise>::type;
coroutine_handle __tmp;
__tmp.__handle_ =
__builtin_coro_promise(_VSTD::addressof(const_cast<_RawPromise&>(__promise)), alignof(_Promise), true);
return __tmp;
}
_LIBCPP_HIDE_FROM_ABI
coroutine_handle& operator=(nullptr_t) noexcept {
__handle_ = nullptr;
return *this;
}
// [coroutine.handle.export.import], export/import
_LIBCPP_HIDE_FROM_ABI
constexpr void* address() const noexcept { return __handle_; }
_LIBCPP_HIDE_FROM_ABI
static constexpr coroutine_handle from_address(void* __addr) noexcept {
coroutine_handle __tmp;
__tmp.__handle_ = __addr;
return __tmp;
}
// [coroutine.handle.conv], conversion
_LIBCPP_HIDE_FROM_ABI
constexpr operator coroutine_handle<>() const noexcept {
return coroutine_handle<>::from_address(address());
}
// [coroutine.handle.observers], observers
_LIBCPP_HIDE_FROM_ABI
constexpr explicit operator bool() const noexcept {
return __handle_ != nullptr;
}
_LIBCPP_HIDE_FROM_ABI
bool done() const {
_LIBCPP_ASSERT(__is_suspended(), "done() can be called only on suspended coroutines");
return __builtin_coro_done(__handle_);
}
// [coroutine.handle.resumption], resumption
_LIBCPP_HIDE_FROM_ABI
void operator()() const { resume(); }
_LIBCPP_HIDE_FROM_ABI
void resume() const {
_LIBCPP_ASSERT(__is_suspended(), "resume() can be called only on suspended coroutines");
_LIBCPP_ASSERT(!done(), "resume() has undefined behavior when the coroutine is done");
__builtin_coro_resume(__handle_);
}
_LIBCPP_HIDE_FROM_ABI
void destroy() const {
_LIBCPP_ASSERT(__is_suspended(), "destroy() can be called only on suspended coroutines");
__builtin_coro_destroy(__handle_);
}
// [coroutine.handle.promise], promise access
_LIBCPP_HIDE_FROM_ABI
_Promise& promise() const {
return *static_cast<_Promise*>(__builtin_coro_promise(this->__handle_, alignof(_Promise), false));
}
private:
bool __is_suspended() const {
// FIXME actually implement a check for if the coro is suspended.
return __handle_ != nullptr;
}
void* __handle_ = nullptr;
};
// [coroutine.handle.hash]
template <class _Tp>
struct hash<coroutine_handle<_Tp>> {
_LIBCPP_HIDE_FROM_ABI
size_t operator()(const coroutine_handle<_Tp>& __v) const noexcept { return hash<void*>()(__v.address()); }
};
_LIBCPP_END_NAMESPACE_STD
#endif // __LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CXX20_COROUTINES)
#endif // _LIBCPP___COROUTINE_COROUTINE_HANDLE_H
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