1 /*
2  * Copyright (C) 2015 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 public class Main {
foo(int start, int[] array)18   public static int foo(int start, int[] array) {
19     int result = 0;
20     // We will create HDeoptimize nodes for this first loop, and a phi
21     // for the array length which will only be used within the loop.
22     for (int i = start; i < 3; i++) {
23       result += array[i];
24       for (int j = 0; j < 2; ++j) {
25         // The HBoundsCheck for this array access will be updated to access
26         // the array length phi created for the deoptimization checks of the
27         // first loop. This crashed the compiler which used to DCHECK an array
28         // length in a bounds check cannot be a phi.
29         result += array[j];
30       }
31     }
32     return result;
33   }
34 
bar(int start, int[] array)35   public static int bar(int start, int[] array) {
36     int result = 0;
37     for (int i = start; i < 3; i++) {
38       result += array[i];
39       for (int j = 0; j < 2; ++j) {
40         result += array[j];
41         // The following operations would lead to BCE wanting to add another
42         // deoptimization, but it crashed assuming the input of a `HBoundsCheck`
43         // must be a `HArrayLength`.
44         result += array[0];
45         result += array[1];
46         result += array[2];
47       }
48     }
49     return result;
50   }
51 
main(String[] args)52   public static void main(String[] args) {
53     int[] a = new int[] { 1, 2, 3, 4, 5 };
54     int result = foo(1, a);
55     if (result != 11) {
56       throw new Error("Got " + result + ", expected " + 11);
57     }
58 
59     result = bar(1, a);
60     if (result != 35) {
61       throw new Error("Got " + result + ", expected " + 35);
62     }
63   }
64 }
65