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 
18 public class Main {
19   public int x = 0;
20 
Main(Main c)21   public Main(Main c) {
22     // After inlining the graph will look like:
23     //     NullCheck c
24     //     InstanceFieldGet c
25     //     InstanceFieldSet this 3
26     // The dead code will eliminate the InstanceFieldGet and we'll end up with:
27     //     NullCheck c
28     //     InstanceFieldSet this 3
29     // At codegen, when verifying if we can move the null check to the user,
30     // we should check that we actually have the same user (not only that the
31     // next instruction can do implicit null checks).
32     // In this case we should generate code for the NullCheck since the next
33     // instruction checks a different object.
34     c.willBeInlined();
35     x = 3;
36   }
37 
willBeInlined()38   private int willBeInlined() {
39     return x;
40   }
41 
main(String[] args)42   public static void main(String[] args) {
43     try {
44       new Main(null);
45       throw new RuntimeException("Failed to throw NullPointerException");
46     } catch (NullPointerException e) {
47       // expected
48     }
49   }
50 }
51