PlatformUtil.java

/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * 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 org.bson.internal;

/**
 * Utility class for platform-specific operations.
 * This class is not part of the public API and may be removed or changed at any time.
 */
public final class PlatformUtil {

    private PlatformUtil() {}

    // These architectures support unaligned memory access.
    // While others might as well, it's safer to assume they don't.
    private static final String[] ARCHITECTURES_ALLOWING_UNALIGNED_ACCESS = {
            "x86",
            "amd64",
            "i386",
            "x86_64",
            "arm64", // evergreen dbx-perf-distro uses this architecture
            "aarch64"};

    public static boolean isUnalignedAccessAllowed() {
        try {
            String processArch = System.getProperty("os.arch");
            for (String supportedArch : ARCHITECTURES_ALLOWING_UNALIGNED_ACCESS) {
                if (supportedArch.equals(processArch)) {
                    return true;
                }
            }
            return false;
        } catch (Exception e) {
            // Ignore security exception and proceed with default value
            return false;
        }
    }
}