diff options
Diffstat (limited to 'libc/include/llvm-libc-macros/containerof-macro.h')
| -rw-r--r-- | libc/include/llvm-libc-macros/containerof-macro.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/libc/include/llvm-libc-macros/containerof-macro.h b/libc/include/llvm-libc-macros/containerof-macro.h new file mode 100644 index 000000000000..debf441bf845 --- /dev/null +++ b/libc/include/llvm-libc-macros/containerof-macro.h @@ -0,0 +1,20 @@ +//===-- Definition of the containerof macro -------------------------------===// +// +// 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 LLVM_LIBC_MACROS_CONTAINEROF_MACRO_H +#define LLVM_LIBC_MACROS_CONTAINEROF_MACRO_H + +#include "offsetof-macro.h" + +#define __containerof(ptr, type, member) \ + ({ \ + const __typeof(((type *)0)->member) *__ptr = (ptr); \ + (type *)(void *)((const char *)__ptr - offsetof(type, member)); \ + }) + +#endif // LLVM_LIBC_MACROS_CONTAINEROF_MACRO_H |