| /* |
| * Copyright (c) 2019 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef PAS_SHARED_HANDLE_OR_PAGE_H |
| #define PAS_SHARED_HANDLE_OR_PAGE_H |
| |
| #include "pas_utils.h" |
| |
| PAS_BEGIN_EXTERN_C; |
| |
| struct pas_segregated_page; |
| struct pas_segregated_shared_handle; |
| struct pas_shared_handle_or_page_opaque; |
| typedef struct pas_segregated_page pas_segregated_page; |
| typedef struct pas_segregated_shared_handle pas_segregated_shared_handle; |
| typedef struct pas_shared_handle_or_page_opaque* pas_shared_handle_or_page; |
| |
| #define PAS_IS_SHARED_HANDLE_BIT ((uintptr_t)1) |
| |
| static inline pas_shared_handle_or_page |
| pas_wrap_page(pas_segregated_page* page) |
| { |
| return (pas_shared_handle_or_page)page; |
| } |
| |
| static inline bool |
| pas_is_wrapped_shared_handle(pas_shared_handle_or_page shared_handle_or_page) |
| { |
| return (uintptr_t)shared_handle_or_page & PAS_IS_SHARED_HANDLE_BIT; |
| } |
| |
| static inline bool |
| pas_is_wrapped_page(pas_shared_handle_or_page shared_handle_or_page) |
| { |
| return !pas_is_wrapped_shared_handle(shared_handle_or_page); |
| } |
| |
| static inline pas_segregated_page* |
| pas_unwrap_page(pas_shared_handle_or_page shared_handle_or_page) |
| { |
| PAS_ASSERT(pas_is_wrapped_page(shared_handle_or_page)); |
| return (pas_segregated_page*)shared_handle_or_page; |
| } |
| |
| PAS_END_EXTERN_C; |
| |
| #endif /* PAS_SHARED_HANDLE_OR_PAGE_H */ |
| |