| // Copyright 2021 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef ZIRCON_AVAILABILITY_H_ |
| #define ZIRCON_AVAILABILITY_H_ |
| |
| // Emulate a "HEAD" API level since it is not supported directly by clang. |
| // Fuchsia API levels are unsigned 64-bit integers, but clang stores API levels as 32-bit, |
| // so we define this as `((uint32_t)-1)`. clang expects API levels to be literals. |
| #define FUCHSIA_HEAD 4294967295 |
| |
| #if defined(__Fuchsia_API_level__) && defined(__clang__) |
| |
| // An API that was added to the platform. |
| // |
| // Annotates the API level at which the API was added to the platform. Use |
| // ZX_DEPRECATED_SINCE if the API is later deprecated. |
| // |
| // Example: |
| // |
| // void fdio_spawn(...) ZX_AVAILABLE_SINCE(4); |
| // |
| #define ZX_AVAILABLE_SINCE(level_added) \ |
| __attribute__((availability(fuchsia, strict, introduced = level_added))) |
| |
| // An API that was added the platform and later deprecated. |
| // |
| // Annotates the API level at which the API added the platform and the API |
| // level at which the API was deprecated. |
| // |
| // Deprecated API can still be called by clients. The deprecation annotation |
| // is a warning that the API is likely to be removed in the future. APIs should |
| // be deprecated for at least one API level before being removed. |
| // |
| // Use the `msg` parameter to explain why the API was deprecated and what |
| // clients should do instead of using the API. |
| // |
| // Example: |
| // |
| // void fdio_fork(...) ZX_DEPRECATED_SINCE(1, 4, |
| // "Root cause of security vulnerabilities due to implicit handle " |
| // "transfer. Use fdio_spawn instead."); |
| // |
| #define ZX_DEPRECATED_SINCE(level_added, level_deprecated, msg) \ |
| __attribute__((availability(fuchsia, strict, introduced = level_added, \ |
| deprecated = level_deprecated, message = msg))) |
| |
| // An API that was added to the platform and later removed. |
| // |
| // Annotates the API level at which the API added the platform, the API |
| // level at which the API was deprecated, and the API level at which the API |
| // was removed. |
| // |
| // Clients can no longer call APIs if they are compiled to target an API |
| // level at, or beyond, the level at which the API was removed. APIs should be |
| // deprecated for at least one API level before being removed. |
| // |
| // Example: |
| // |
| // void fdio_fork(...) ZX_REMOVED_SINCE(1, 4, 8, |
| // "Root cause of security vulnerabilities due to implicit handle " |
| // "transfer. Use fdio_spawn instead."); |
| // |
| #define ZX_REMOVED_SINCE(level_added, level_deprecated, level_removed, msg) \ |
| __attribute__((availability(fuchsia, strict, introduced = level_added, \ |
| deprecated = level_deprecated, obsoleted = level_removed, \ |
| message = msg))) |
| |
| #else // __Fuchsia_API_level__ |
| |
| #define ZX_AVAILABLE_SINCE(level_added) |
| #define ZX_DEPRECATED_SINCE(level_added, level_deprecated, msg) |
| #define ZX_REMOVED_SINCE(level_added, level_deprecated, level_removed, msg) |
| |
| #endif // __Fuchsia_API_level__ |
| |
| #endif // ZIRCON_AVAILABILITY_H_ |
