--- /dev/null
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * 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 GRPC_CORE_LIB_GPR_ALLOC_H
+#define GRPC_CORE_LIB_GPR_ALLOC_H
+
+#include <grpc/support/port_platform.h>
+
+/// Given a size, round up to the next multiple of sizeof(void*).
+#define GPR_ROUND_UP_TO_ALIGNMENT_SIZE(x) \
+ (((x) + GPR_MAX_ALIGNMENT - 1u) & ~(GPR_MAX_ALIGNMENT - 1u))
+
+#endif /* GRPC_CORE_LIB_GPR_ALLOC_H */