1 /* 2 * Copyright (C) 2008 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 import java.util.Arrays; 18 import java.util.LinkedList; 19 20 /** 21 * Exercise the construction and throwing of OutOfMemoryError. 22 */ 23 public class Main { 24 public static void main(String args[]) { 25 System.out.println("tests beginning"); 26 testHugeArray(); 27 testOomeLarge(); 28 testOomeSmall(); 29 System.out.println("tests succeeded"); 30 } 31 32 private static void testHugeArray() { 33 try { 34 final int COUNT = 32768*32768 + 4; 35 int[] tooBig = new int[COUNT]; 36 37 Arrays.fill(tooBig, 0xdd); 38 } catch (OutOfMemoryError oom) { 39 System.out.println("Got expected huge-array OOM"); 40 } 41 } 42 43 private static void testOomeLarge() { 44 System.out.println("testOomeLarge beginning"); 45 46 Boolean sawEx = false; 47 byte[] a; 48 49 try { 50 // Just shy of the typical max heap size so that it will actually 51 // try to allocate it instead of short-circuiting. 52 a = new byte[(int) Runtime.getRuntime().maxMemory() - 32]; 53 } catch (OutOfMemoryError oom) { 54 //Log.i(TAG, "HeapTest/OomeLarge caught " + oom); 55 sawEx = true; 56 } 57 58 if (!sawEx) { 59 throw new RuntimeException("Test failed: " + 60 "OutOfMemoryError not thrown"); 61 } 62 63 System.out.println("testOomeLarge succeeded"); 64 } 65 66 /* Do this in another method so that the GC has a chance of freeing the 67 * list afterwards. Even if we null out list when we're done, the conservative 68 * GC may see a stale pointer to it in a register. 69 */ 70 private static boolean testOomeSmallInternal() { 71 final int LINK_SIZE = 6 * 4; // estimated size of a LinkedList's node 72 73 LinkedList<Object> list = new LinkedList<Object>(); 74 75 /* Allocate progressively smaller objects to fill up the entire heap. 76 */ 77 int objSize = 1 * 1024 * 1024; 78 while (objSize >= LINK_SIZE) { 79 boolean sawEx = false; 80 try { 81 for (int i = 0; i < Runtime.getRuntime().maxMemory() / objSize; i++) { 82 list.add((Object)new byte[objSize]); 83 } 84 } catch (OutOfMemoryError oom) { 85 sawEx = true; 86 } 87 88 if (!sawEx) { 89 return false; 90 } 91 92 objSize = (objSize * 4) / 5; 93 } 94 95 return true; 96 } 97 98 private static void testOomeSmall() { 99 System.out.println("testOomeSmall beginning"); 100 if (!testOomeSmallInternal()) { 101 /* Can't reliably throw this from inside the internal function, because 102 * we may not be able to allocate the RuntimeException. 103 */ 104 throw new RuntimeException("Test failed: " + 105 "OutOfMemoryError not thrown while filling heap"); 106 } 107 System.out.println("testOomeSmall succeeded"); 108 } 109 } 110
