mirror of
https://github.com/denoland/rusty_v8.git
synced 2024-12-26 09:13:46 -05:00
63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
#ifndef SUPPORT_H_
|
|
#define SUPPORT_H_
|
|
|
|
#include <cassert>
|
|
#include <memory>
|
|
#include <new>
|
|
#include <type_traits>
|
|
#include <utility>
|
|
|
|
#include "v8/include/v8.h"
|
|
|
|
// Check assumptions made in binding code.
|
|
// TODO(ry) re-enable the following
|
|
// static_assert(sizeof(bool) == sizeof(uint8_t));
|
|
// static_assert(sizeof(std::unique_ptr<void>) == sizeof(void*));
|
|
|
|
namespace support {
|
|
template <class T>
|
|
using uninit_t = typename std::aligned_storage<sizeof(T), alignof(T)>::type;
|
|
|
|
template <class T, class... Args>
|
|
class construct_in_place_helper {
|
|
public:
|
|
construct_in_place_helper(uninit_t<T>& buf, Args... args)
|
|
: inner_(std::forward<Args>(args)...) {}
|
|
|
|
private:
|
|
T inner_;
|
|
};
|
|
|
|
template <class T, class... Args>
|
|
void construct_in_place(uninit_t<T>& buf, Args... args) {
|
|
new (&buf)
|
|
construct_in_place_helper<T, Args...>(buf, std::forward<Args>(args)...);
|
|
}
|
|
} // namespace support
|
|
|
|
|
|
template <class T>
|
|
inline static T* local_to_ptr(v8::Local<T> local) {
|
|
return *local;
|
|
}
|
|
|
|
template <class T>
|
|
inline static v8::Local<T> ptr_to_local(T* ptr) {
|
|
static_assert(sizeof(v8::Local<T>) == sizeof(T*), "");
|
|
auto local = *reinterpret_cast<v8::Local<T>*>(&ptr);
|
|
assert(*local == ptr);
|
|
return local;
|
|
}
|
|
|
|
template <class T>
|
|
inline static T* maybe_local_to_ptr(v8::MaybeLocal<T> local) {
|
|
return *local.FromMaybe(v8::Local<T>());
|
|
}
|
|
|
|
template <class T>
|
|
inline static v8::MaybeLocal<T> ptr_to_maybe_local(T* ptr) {
|
|
static_assert(sizeof(v8::MaybeLocal<T>) == sizeof(T*), "");
|
|
return *reinterpret_cast<v8::MaybeLocal<T>*>(&ptr);
|
|
}
|
|
|
|
#endif // SUPPORT_H_
|