From cf9c855e5b1b656998a9f23f1f5005569c7168c5 Mon Sep 17 00:00:00 2001 From: Dan Albert Date: Thu, 9 Apr 2015 16:58:47 -0700 Subject: Add base/memory.h. Right now this only includes an API for unaligned reads/writes. Change-Id: Ieb42498aa17cbd1035b66c51bd1c4f16fa2acfdb --- base/include/base/memory.h | 47 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 base/include/base/memory.h (limited to 'base') diff --git a/base/include/base/memory.h b/base/include/base/memory.h new file mode 100644 index 0000000..882582f --- /dev/null +++ b/base/include/base/memory.h @@ -0,0 +1,47 @@ +/* + * Copyright (C) 2015 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef BASE_MEMORY_H +#define BASE_MEMORY_H + +namespace android { +namespace base { + +// Use packed structures for access to unaligned data on targets with alignment +// restrictions. The compiler will generate appropriate code to access these +// structures without generating alignment exceptions. +template +static inline T get_unaligned(const T* address) { + struct unaligned { + T v; + } __attribute__((packed)); + const unaligned* p = reinterpret_cast(address); + return p->v; +} + +template +static inline void put_unaligned(T* address, T v) { + struct unaligned { + T v; + } __attribute__((packed)); + unaligned* p = reinterpret_cast(address); + p->v = v; +} + +} // namespace base +} // namespace android + +#endif // BASE_MEMORY_H -- cgit v1.1