1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17public class Main {
18  static volatile boolean done = false;
19
20  public static void main(String[] args) {
21    // Run a thread for 30 seconds, allocating memory and triggering garbage
22    // collection.
23    // Time is limited to 30 seconds to not make this test too long. The test used
24    // to trigger the failure around 1 every 10 runs.
25    Thread t = new Thread() {
26      public void run() {
27        long time = System.currentTimeMillis();
28        while (System.currentTimeMillis() - time < 30000) {
29          for (int j = 0; j < 10000; j++) {
30            o = new Object[1000];
31          }
32          Runtime.getRuntime().gc();
33          Thread.yield();
34        }
35        Main.done = true;
36      }
37      Object o;
38    };
39    // Make the thread a daemon to quit early in case of an
40    // exception throw below.
41    t.setDaemon(true);
42    t.start();
43
44    // Run 'foo' as long as the test runs.
45    while (!done) {
46      double res = foo(staticMain);
47      if (res != 529.0) {
48        throw new Error("Unexpected result " + res);
49      }
50    }
51  }
52
53  public static double foo(Main main) {
54    // Use up all D registers on arm64.
55    double d1 = main.field1;
56    double d2 = main.field2;
57    double d3 = main.field3;
58    double d4 = main.field4;
59    double d5 = main.field5;
60    double d6 = main.field6;
61    double d7 = main.field7;
62    double d8 = main.field8;
63    double d9 = main.field9;
64    double d10 = main.field10;
65    double d11 = main.field11;
66    double d12 = main.field12;
67    double d13 = main.field13;
68    double d14 = main.field14;
69    double d15 = main.field15;
70    double d16 = main.field16;
71    double d17 = main.field17;
72    double d18 = main.field18;
73    double d19 = main.field19;
74    double d20 = main.field20;
75    double d21 = main.field21;
76    double d22 = main.field22;
77    double d23 = main.field23;
78    double d24 = main.field24;
79    double d25 = main.field25;
80    double d26 = main.field26;
81    double d27 = main.field27;
82    double d28 = main.field28;
83    double d29 = main.field29;
84    double d30 = main.field30;
85    double d31 = main.field31;
86    double d32 = main.field32;
87
88    // Trigger a read barrier. This used to make the test trip on ARM64 as
89    // the read barrier stub used to not restore the D registers.
90    double p = main.objectField.field1;
91
92    return p + d1 + d2 + d3 + d4 + d5 + d6 + d7 + d8 + d9 + d10 + d11 + d12 + d13 + d14 + d15 + d16 + d17 + d18 + d19 + d20 + d21 + d22 + d23 + d24 + d25 + d26 + d27 + d28 + d29 + d30 + d31 + d32;
93  }
94
95  // Initialize objects here and not in 'main' to avoid having
96  // these objects in roots.
97  public static Main staticMain = new Main();
98  static {
99    staticMain.objectField = new Main();
100  }
101
102  public Main objectField;
103
104  public double field1 = 1.0;
105  public double field2 = 2.0;
106  public double field3 = 3.0;
107  public double field4 = 4.0;
108  public double field5 = 5.0;
109  public double field6 = 6.0;
110  public double field7 = 7.0;
111  public double field8 = 8.0;
112  public double field9 = 9.0;
113  public double field10 = 10.0;
114  public double field11 = 11.0;
115  public double field12 = 12.0;
116  public double field13 = 13.0;
117  public double field14 = 14.0;
118  public double field15 = 15.0;
119  public double field16 = 16.0;
120  public double field17 = 17.0;
121  public double field18 = 18.0;
122  public double field19 = 19.0;
123  public double field20 = 20.0;
124  public double field21 = 21.0;
125  public double field22 = 22.0;
126  public double field23 = 23.0;
127  public double field24 = 24.0;
128  public double field25 = 25.0;
129  public double field26 = 26.0;
130  public double field27 = 27.0;
131  public double field28 = 28.0;
132  public double field29 = 29.0;
133  public double field30 = 30.0;
134  public double field31 = 31.0;
135  public double field32 = 32.0;
136}
137