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Diffstat (limited to 'tests/061-out-of-memory/src/Main.java')
-rw-r--r-- | tests/061-out-of-memory/src/Main.java | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/tests/061-out-of-memory/src/Main.java b/tests/061-out-of-memory/src/Main.java new file mode 100644 index 0000000..b5999b3 --- /dev/null +++ b/tests/061-out-of-memory/src/Main.java @@ -0,0 +1,117 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +import java.util.Arrays; +import java.util.LinkedList; + +/** + * Exercise the construction and throwing of OutOfMemoryError. + */ +public class Main { + public static void main(String args[]) { + System.out.println("tests beginning"); + testHugeArray(); + testOomeLarge(); + testOomeSmall(); + System.out.println("tests succeeded"); + } + + private static void testHugeArray() { + try { + final int COUNT = 32768*32768 + 4; + int[] tooBig = new int[COUNT]; + + Arrays.fill(tooBig, 0xdd); + } catch (OutOfMemoryError oom) { + System.out.println("Got expected huge-array OOM"); + } + } + + private static void testOomeLarge() { + System.out.println("testOomeLarge beginning"); + + /* Just shy of the typical max heap size so that it will actually + * try to allocate it instead of short-circuiting. + * + * TODO: stop assuming the VM defaults to 16MB max + */ + final int SIXTEEN_MB = (16 * 1024 * 1024 - 32); + + Boolean sawEx = false; + byte a[]; + + try { + a = new byte[SIXTEEN_MB]; + } catch (OutOfMemoryError oom) { + //Log.i(TAG, "HeapTest/OomeLarge caught " + oom); + sawEx = true; + } + + if (!sawEx) { + throw new RuntimeException("Test failed: " + + "OutOfMemoryError not thrown"); + } + + System.out.println("testOomeLarge succeeded"); + } + + /* Do this in another method so that the GC has a chance of freeing the + * list afterwards. Even if we null out list when we're done, the conservative + * GC may see a stale pointer to it in a register. + * + * TODO: stop assuming the VM defaults to 16MB max + */ + private static boolean testOomeSmallInternal() { + final int SIXTEEN_MB = (16 * 1024 * 1024); + final int LINK_SIZE = 6 * 4; // estimated size of a LinkedList's node + + LinkedList<Object> list = new LinkedList<Object>(); + + /* Allocate progressively smaller objects to fill up the entire heap. + */ + int objSize = 1 * 1024 * 1024; + while (objSize >= LINK_SIZE) { + boolean sawEx = false; + try { + for (int i = 0; i < SIXTEEN_MB / objSize; i++) { + list.add((Object)new byte[objSize]); + } + } catch (OutOfMemoryError oom) { + sawEx = true; + } + + if (!sawEx) { + return false; + } + + objSize = (objSize * 4) / 5; + } + + return true; + } + + private static void testOomeSmall() { + System.out.println("testOomeSmall beginning"); + if (!testOomeSmallInternal()) { + /* Can't reliably throw this from inside the internal function, because + * we may not be able to allocate the RuntimeException. + */ + throw new RuntimeException("Test failed: " + + "OutOfMemoryError not thrown while filling heap"); + } + System.out.println("testOomeSmall succeeded"); + } +} |