1/*
2 * Copyright (C) 2014 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
17// Regression test for 22460222, the sub class.
18// The field gaps order was wrong. If there were two gaps of different sizes,
19// and the larger one was needed, it wouldn't be found.
20
21import java.lang.reflect.Field;
22import java.lang.reflect.Method;
23
24class GapOrder extends GapOrderBase {
25  // The base class is 9 bytes. The entire class should be packed as:
26  //
27  //    00: oooo oooo
28  //    08: b-ss rrrr
29  //    16: rrrr iiii
30  //    24: dddd dddd
31  //
32  // The problem was, the packer wasn't finding the gap where iiii should go,
33  // because the gap where ss goes was given priority. Instead it packed as:
34  //    00: oooo oooo
35  //    08: b--- rrrr
36  //    16: rrrr ----
37  //    24: dddd dddd
38  //    32: iiii ss
39  public Object r1;
40  public Object r2;
41  public double d;
42  public int i;
43  public short s;
44
45  static private void CheckField(String fieldName, int expected) {
46    Field field = null;
47    try {
48      field = GapOrder.class.getField(fieldName);
49    } catch (ReflectiveOperationException e) {
50      System.out.println(fieldName + " not found in GapOrder.");
51      return;
52    }
53
54    int actual = -1;
55    try {
56      Method getOffset = Field.class.getMethod("getOffset");
57      actual = (Integer)getOffset.invoke(field);
58    } catch (ReflectiveOperationException e) {
59      System.out.println("Unable to get field offset for " + fieldName + ":" + e);
60      return;
61    }
62
63    if (actual != expected) {
64      System.out.println(
65          String.format("GapOrder.%s has offset %d, but expected %d",
66            fieldName, actual, expected));
67    }
68  }
69
70  static public void Check() {
71    CheckField("r1", 12);
72    CheckField("r2", 16);
73    CheckField("d", 24);
74    CheckField("i", 20);
75    CheckField("s", 10);
76  }
77}
78
79