Main.java revision c7508e93fa3df3a3890f6b62550cbd5e35bdd8df 
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
18public class Main {
19  public static void assertBooleanEquals(boolean expected, boolean result) {
20    if (expected != result) {
21      throw new Error("Expected: " + expected + ", found: " + result);
22    }
23  }
24
25  public static boolean inlinePhi(boolean x, boolean y, boolean z) {
26    boolean phi;
27    if (z) {
28      phi = x;
29    } else {
30      phi = y;
31    }
32    return phi;
33  }
34
35  public static boolean dontUseParam(boolean x) {
36    return false;
37  }
38
39  public static boolean testCase(boolean x, boolean y, boolean z) {
40    // First create a Phi(x, y).
41    boolean phi = inlinePhi(x, y, z);
42    // Now use the phi as a condition which the boolean simplifier will try to
43    // optimize out. If the result is not used, the algorithm will try to remove
44    // the original condition (phi) and crash.
45    return dontUseParam(phi == false ? false : true);
46  }
47
48  public static void main(String[] args) {
49    assertBooleanEquals(false, testCase(true, true, true));
50  }
51}
52