/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package art;
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import java.util.ArrayList;
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public class Test908 {
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public static void run() throws Exception {
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doTest();
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}
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public static void doTest() throws Exception {
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// Use a list to ensure objects must be allocated.
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ArrayList<Object> l = new ArrayList<>(100);
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setupGcCallback();
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enableGcTracking(true);
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run(l);
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enableGcTracking(false);
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run(l);
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}
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private static void run(ArrayList<Object> l) {
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allocate(l, 1);
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l.clear();
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Runtime.getRuntime().gc();
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printStats();
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// Note: the reporting will not depend on the heap layout (which could be unstable). Walking
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// the tag table should give us a stable output order.
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for (int i = 10; i <= 1000; i *= 10) {
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allocate(l, i);
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}
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l.clear();
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Runtime.getRuntime().gc();
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printStats();
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Runtime.getRuntime().gc();
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printStats();
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}
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private static void allocate(ArrayList<Object> l, long tag) {
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Object obj = new Object();
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l.add(obj);
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}
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private static void printStats() {
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System.out.println("---");
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int s = getGcStarts();
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int f = getGcFinishes();
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System.out.println((s > 0) + " " + (f > 0));
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}
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private static native void setupGcCallback();
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private static native void enableGcTracking(boolean enable);
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private static native int getGcStarts();
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private static native int getGcFinishes();
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}
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