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      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 
     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 
     38   private int willBeInlined() {
     39     return x;
     40   }
     41 
     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