Add huge-array OOM test

Added a regression test for allocation of 4GB+ arrays.

Change-Id: Ibac82bbba9ef25b0850386a35e0f5b8554abbaa3

2 files changed, 18 insertions, 0 deletions

diff --git a/tests/061-out-of-memory/expected.txt b/tests/061-out-of-memory/expected.txt
index e1ed5da64..ca876299f 100644
--- a/tests/061-out-of-memory/expected.txt
+++ b/tests/061-out-of-memory/expected.txt
@@ -1,4 +1,5 @@
 tests beginning
+Got expected huge-array OOM
 testOomeLarge beginning
 testOomeLarge succeeded
 testOomeSmall beginning
diff --git a/tests/061-out-of-memory/src/Main.java b/tests/061-out-of-memory/src/Main.java
index fcf71362d..b5999b34b 100644
--- a/tests/061-out-of-memory/src/Main.java
+++ b/tests/061-out-of-memory/src/Main.java
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+import java.util.Arrays;
 import java.util.LinkedList;
 
 /**
@@ -22,16 +23,30 @@ import java.util.LinkedList;
 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);
 
@@ -56,6 +71,8 @@ public class Main {
     /* 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);