Method next_stacklet

include/libfork/core/impl/stack.hpp:138–167

* @brief Allocate a new stacklet with a stack of size of at least`size` and attach it to the given * stacklet chain. * * Requires that `prev` must be the top stacklet in a chain or `nullptr`. This will round size up to */

     * Requires that `prev` must be the top stacklet in a chain or `nullptr`. This will round size up to
     */
    [[nodiscard]] LF_NOINLINE static auto next_stacklet(std::size_t size, stacklet *prev) -> stacklet * {

      LF_LOG("allocating a new stacklet");

      LF_ASSERT(prev == nullptr || prev->is_top());

      std::size_t request = impl::round_up_to_page_size(size + sizeof(stacklet));

      LF_ASSERT(request >= sizeof(stacklet) + size);

      stacklet *next = static_cast<stacklet *>(std::malloc(request)); // NOLINT

      if (next == nullptr) {
        LF_THROW(std::bad_alloc());
      }

      if (prev != nullptr) {
        // Set next tidies up other next.
        prev->set_next(next);
      }

      next->m_lo = impl::byte_cast(next) + sizeof(stacklet);
      next->m_sp = next->m_lo;
      next->m_hi = impl::byte_cast(next) + request;

      next->m_prev = prev;
      next->m_next = nullptr;

      return next;
    }

    /**
     * @brief Allocate an initial stacklet.