Mercurial > hg > truffle
view test/compiler/6859338/Test6859338.java @ 3293:1f4413413144
7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
Summary: In G1 heap verification, we no longer scan perm to G1-collected heap refs as part of process_strong_roots() but rather in a separate explicit oop iteration over the perm gen. This preserves the original perm card-marks. Added a new assertion in younger_refs_iterate() to catch a simple subcase where the user may have forgotten a prior save_marks() call, as happened in the case of G1's attempt to iterate perm to G1 refs when verifying the heap before exit. The assert was deliberately weakened for ParNew+CMS and will be fixed for that combination in a future CR. Also made some (non-G1) cleanups related to code and comments obsoleted by the migration of Symbols to the native heap.
Reviewed-by: iveresov, jmasa, tonyp
author | ysr |
---|---|
date | Tue, 26 Apr 2011 21:17:24 -0700 |
parents | c18cbe5936b8 |
children | da91efe96a93 |
line wrap: on
line source
/* * Copyright (c) 2009, Oracle and/or its affiliates. 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 6859338 * @summary Assertion failure in sharedRuntime.cpp * * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-InlineObjectHash -Xbatch -XX:-ProfileInterpreter Test6859338 */ public class Test6859338 { static Object[] o = new Object[] { new Object(), null }; public static void main(String[] args) { int total = 0; try { // Exercise the implicit null check in the unverified entry point for (int i = 0; i < 40000; i++) { int limit = o.length; if (i < 20000) limit = 1; for (int j = 0; j < limit; j++) { total += o[j].hashCode(); } } } catch (NullPointerException e) { // this is expected. A true failure causes a crash } } }