tools/preload-check/device/src/com/android/preload/check/Util.java

/*
 * Copyright (C) 2019 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.
 */

package com.android.preload.check;

import java.lang.reflect.Field;

public class Util {
    private static Field statusField;

    static {
        try {
            Class<?> klass = Class.class;
            statusField = klass.getDeclaredField("status");
            statusField.setAccessible(true);
        } catch (Throwable t) {
            throw new RuntimeException(t);
        }
    }

    public static boolean isInitialized(Class<?> klass) throws Exception {
        Object val = statusField.get(klass);
        if (val == null || !(val instanceof Integer)) {
            throw new IllegalStateException(String.valueOf(val));
        }
        int intVal = (int)val;
        intVal = (intVal >> (32-4)) & 0xf;
        return intVal >= 14;
    }

    public static void assertTrue(boolean val, String msg) {
        if (!val) {
            throw new RuntimeException(msg);
        }
    }

    public static void assertInitializedState(String className, boolean expected,
            ClassLoader loader) {
        boolean initialized;
        try {
            Class<?> klass = Class.forName(className, /* initialize */ false, loader);
            initialized = isInitialized(klass);
        } catch (Throwable t) {
            throw new RuntimeException(t);
        }
        assertTrue(expected == initialized, className);
    }

    public static void assertNotInitialized(String className, ClassLoader loader) {
        assertInitializedState(className, false, loader);
    }

    public static void assertInitialized(String className, ClassLoader loader) {
        assertInitializedState(className, true, loader);
    }
}