1 /* 2 * Copyright (C) 2017 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 * Regression test on ARM-scheduling/array-aliasing bug (b/64018485). 19 */ 20 public class Main { 21 22 // 23 // Mimic original bug. 24 // 25 setFields(int[] fields)26 static void setFields(int[] fields) { 27 if (fields == null || fields.length < 6) 28 fields = new int[6]; // creates phi 29 fields[5] = 127; 30 } 31 processFieldValues(int field0, int field1, int field2, int field3, int field4, int field5)32 static void processFieldValues(int field0, int field1, int field2, 33 int field3, int field4, int field5) { 34 if (field5 != 127) { 35 throw new Error("field = " + field5); 36 } else if (field0 != 0) { 37 processFieldValues(0, 0, 0, 0, 0, 0); // disable inlining 38 } 39 } 40 doit(int pass)41 static int doit(int pass) { 42 int[] fields = new int[6]; 43 for (; ; pass++) { 44 setFields(fields); 45 processFieldValues(fields[0], fields[1], fields[2], 46 fields[3], fields[4], fields[5]); 47 if (pass == 0) 48 break; 49 } 50 return fields[5]; 51 } 52 53 // 54 // Similar situation. 55 // 56 aliasing(boolean f)57 private static int aliasing(boolean f) { 58 int[] array = new int[6]; 59 int[] array2 = null; 60 int s = 0; 61 for (int i = 0; i < 1; i++) { 62 if (f) { 63 array2 = array; 64 } 65 array2[1] = 4; 66 s = array[1]; 67 } 68 return s; 69 } 70 71 // 72 // Main driver. 73 // 74 main(String[] args)75 static public void main(String[] args) { 76 int r = doit(0); 77 int s = aliasing(true); 78 System.out.println("passed " + r + " " + s); 79 } 80 } 81