| // Copyright 2023 The Bazel Authors. All rights reserved. |
| // |
| // 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. |
| package com.google.devtools.build.lib.concurrent; |
| |
| import static com.google.common.truth.Truth.assertThat; |
| import static com.google.devtools.build.lib.concurrent.PaddedAddresses.ALIGNMENT; |
| import static com.google.devtools.build.lib.concurrent.PaddedAddresses.createPaddedBaseAddress; |
| import static com.google.devtools.build.lib.concurrent.PaddedAddresses.getAlignedAddress; |
| |
| import com.google.devtools.build.lib.unsafe.UnsafeProvider; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| import sun.misc.Unsafe; |
| |
| @RunWith(JUnit4.class) |
| public final class PaddedAddressesTest { |
| |
| @Test |
| public void createdAddresses_areAligned() { |
| long address = createPaddedBaseAddress(2); |
| |
| long first = getAlignedAddress(address, /* offset= */ 0); |
| assertThat(first & (ALIGNMENT - 1)).isEqualTo(0); |
| |
| long second = getAlignedAddress(address, /* offset= */ 1); |
| assertThat(second - first).isEqualTo(ALIGNMENT); |
| |
| UNSAFE.freeMemory(address); |
| } |
| |
| private static final Unsafe UNSAFE = UnsafeProvider.unsafe(); |
| } |