1 /* 2 * Copyright (C) 2016 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 tests for LICM. 19 */ 20 public class Main { 21 22 static int sA; 23 24 // 25 // We cannot hoist the null check (can throw) above the field 26 // assignment (has write side effects) because that would result 27 // in throwing an exception before the assignment is done. 28 // 29 /// CHECK-START: void Main.foo(int[]) licm (before) 30 /// CHECK-DAG: LoadClass loop:<<Loop:B\d+>> outer_loop:none 31 /// CHECK-DAG: StaticFieldSet loop:<<Loop>> outer_loop:none 32 /// CHECK-DAG: NullCheck loop:<<Loop>> outer_loop:none 33 /// CHECK-DAG: ArrayLength loop:<<Loop>> outer_loop:none 34 // 35 /// CHECK-START: void Main.foo(int[]) licm (after) 36 /// CHECK-DAG: LoadClass loop:none 37 /// CHECK-DAG: StaticFieldSet loop:<<Loop:B\d+>> outer_loop:none 38 /// CHECK-DAG: NullCheck loop:<<Loop>> outer_loop:none 39 /// CHECK-DAG: ArrayLength loop:<<Loop>> outer_loop:none 40 // 41 /// CHECK-START: void Main.foo(int[]) licm (after) 42 /// CHECK-NOT: LoadClass loop:{{B\d+}} outer_loop:none foo(int[] arr)43 static void foo(int[] arr) { 44 int j = 0; 45 do { 46 sA = 1; 47 } while (j < arr.length); 48 } 49 50 // 51 // Similar situation as in foo(), but now a proper induction value 52 // is assigned to the field inside the do-while loop. 53 // 54 /// CHECK-START: void Main.bar(int[]) licm (before) 55 /// CHECK-DAG: LoadClass loop:<<Loop:B\d+>> outer_loop:none 56 /// CHECK-DAG: StaticFieldSet loop:<<Loop>> outer_loop:none 57 /// CHECK-DAG: NullCheck loop:<<Loop>> outer_loop:none 58 /// CHECK-DAG: ArrayLength loop:<<Loop>> outer_loop:none 59 // 60 /// CHECK-START: void Main.bar(int[]) licm (after) 61 /// CHECK-DAG: LoadClass loop:none 62 /// CHECK-DAG: StaticFieldSet loop:<<Loop:B\d+>> outer_loop:none 63 /// CHECK-DAG: NullCheck loop:<<Loop>> outer_loop:none 64 /// CHECK-DAG: ArrayLength loop:<<Loop>> outer_loop:none 65 // 66 /// CHECK-START: void Main.bar(int[]) licm (after) 67 /// CHECK-NOT: LoadClass loop:{{B\d+}} outer_loop:none bar(int[] arr)68 static void bar(int[] arr) { 69 int j = 0; 70 do { 71 j++; 72 sA = j; 73 } while (j < arr.length); 74 } 75 76 // 77 // Similar situation as in bar(), but now an explicit catch 78 // statement may need the latest value of local j. 79 // 80 /// CHECK-START: int Main.catcher(int[]) licm (before) 81 /// CHECK-DAG: NullCheck loop:<<Loop:B\d+>> outer_loop:none 82 /// CHECK-DAG: ArrayLength loop:<<Loop>> outer_loop:none 83 // 84 /// CHECK-START: int Main.catcher(int[]) licm (after) 85 /// CHECK-DAG: NullCheck loop:<<Loop:B\d+>> outer_loop:none 86 /// CHECK-DAG: ArrayLength loop:<<Loop>> outer_loop:none catcher(int[] arr)87 static int catcher(int[] arr) { 88 int j = 0; 89 try { 90 do { 91 j++; 92 } while (j < arr.length); 93 } catch (NullPointerException e) { 94 return -j; // flag exception with negative value 95 } 96 return j; 97 } 98 main(String[] args)99 public static void main(String[] args) { 100 sA = 0; 101 try { 102 foo(null); 103 throw new Error("Expected NPE"); 104 } catch (NullPointerException e) { 105 } 106 expectEquals(1, sA); 107 108 sA = 0; 109 try { 110 bar(null); 111 throw new Error("Expected NPE"); 112 } catch (NullPointerException e) { 113 } 114 expectEquals(1, sA); 115 116 for (int i = 0; i < 5; i++) { 117 sA = 0; 118 bar(new int[i]); 119 expectEquals(i == 0 ? 1 : i, sA); 120 } 121 122 expectEquals(-1, catcher(null)); 123 for (int i = 0; i < 5; i++) { 124 expectEquals(i == 0 ? 1 : i, catcher(new int[i])); 125 } 126 127 System.out.println("passed"); 128 } 129 expectEquals(int expected, int result)130 private static void expectEquals(int expected, int result) { 131 if (expected != result) { 132 throw new Error("Expected: " + expected + ", found: " + result); 133 } 134 } 135 } 136