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