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authorDan Albert <danalbert@google.com>2015-04-09 16:58:47 -0700
committerDan Albert <danalbert@google.com>2015-04-09 17:00:14 -0700
commitcf9c855e5b1b656998a9f23f1f5005569c7168c5 (patch)
treefb2f51ad50c5f05f4f3fa09ce42579c6e27c0ceb /base
parentbe940153816b28cf1cb68f7f135c77f5f1585fe1 (diff)
Add base/memory.h.
Right now this only includes an API for unaligned reads/writes. Change-Id: Ieb42498aa17cbd1035b66c51bd1c4f16fa2acfdb
Diffstat (limited to 'base')
-rw-r--r--base/include/base/memory.h47
1 files changed, 47 insertions, 0 deletions
diff --git a/base/include/base/memory.h b/base/include/base/memory.h
new file mode 100644
index 000000000..882582f89
--- /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 <typename T>
+static inline T get_unaligned(const T* address) {
+ struct unaligned {
+ T v;
+ } __attribute__((packed));
+ const unaligned* p = reinterpret_cast<const unaligned*>(address);
+ return p->v;
+}
+
+template <typename T>
+static inline void put_unaligned(T* address, T v) {
+ struct unaligned {
+ T v;
+ } __attribute__((packed));
+ unaligned* p = reinterpret_cast<unaligned*>(address);
+ p->v = v;
+}
+
+} // namespace base
+} // namespace android
+
+#endif // BASE_MEMORY_H