hotspot/test/compiler/arraycopy/TestInitializingACLoadWithBadMem.java
changeset 46754 2e49bb347cbc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/compiler/arraycopy/TestInitializingACLoadWithBadMem.java	Mon Jul 03 14:33:00 2017 +0200
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2017, Red Hat, Inc. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * @test
+ * @bug 8182036
+ * @summary Load from initializing arraycopy uses wrong memory state
+ *
+ * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:+UnlockDiagnosticVMOptions -XX:+IgnoreUnrecognizedVMOptions -XX:+StressGCM -XX:+StressLCM TestInitializingACLoadWithBadMem
+ *
+ */
+
+import java.util.Arrays;
+
+public class TestInitializingACLoadWithBadMem {
+    static Object test_dummy;
+    static int test1() {
+        int[] src = new int[10];
+        test_dummy = src;
+        int[] dst = new int[10];
+        src[1] = 0x42;
+        // arraycopy generates a load from src/store to dst which must
+        // be after the store to src above.
+        System.arraycopy(src, 1, dst, 1, 9);
+        return dst[1];
+    }
+
+    static public void main(String[] args) {
+        int[] src = new int[10];
+        for (int i = 0; i < 20000; i++) {
+            int res = test1();
+            if (res != 0x42) {
+                throw new RuntimeException("bad result: " + res + " != " + 0x42);
+            }
+        }
+    }
+}