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8075587: Compilation of constant array containing different sub classes crashes the JVM

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Meet of 2 constant arrays result in bottom

Reviewed-by: kvn
This commit is contained in:
Roland Westrelin 2015-03-27 13:47:33 +01:00
parent 1dfbc44c1f
commit 7c5d30b0e3
2 changed files with 73 additions and 1 deletions
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4
hotspot/src/share/vm/opto/type.cpp
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@ -4083,7 +4083,9 @@ const Type *TypeAryPtr::xmeet_helper(const Type *t) const {
(tap->_klass_is_exact && !tap->klass()->is_subtype_of(klass())) ||
// 'this' is exact and super or unrelated:
(this->_klass_is_exact && !klass()->is_subtype_of(tap->klass())))) {
tary = TypeAry::make(Type::BOTTOM, tary->_size, tary->_stable);
if (above_centerline(ptr)) {
tary = TypeAry::make(Type::BOTTOM, tary->_size, tary->_stable);
}
return make(NotNull, NULL, tary, lazy_klass, false, off, InstanceBot, speculative, depth);
}

70
hotspot/test/compiler/types/TestMeetExactConstantArrays.java Normal file
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@ -0,0 +1,70 @@
/*
* Copyright (c) 2015, 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 8075587
* @summary meet of 2 constant arrays result in bottom
* @run main/othervm TestMeetExactConstantArrays
*
*/
public class TestMeetExactConstantArrays {
public abstract static class NumbersHolder {
public Number[] getNumbers() {
return null;
}
}
public static class IntegersHolder extends NumbersHolder {
private final static Integer integers[] = { new Integer(1) };
public Number[] getNumbers() {
return integers;
}
}
public static class LongsHolder extends NumbersHolder {
private final static Long longs[] = { new Long(1) };
public Number[] getNumbers() {
return longs;
}
}
public static final void loopNumbers(NumbersHolder numbersHolder) {
Number[] numbers = numbersHolder.getNumbers();
for (int i = 0; i < numbers.length; i++) {
numbers[i].longValue();
}
}
public static void main(String[] args) throws Exception {
for (int i = 0; i < 10000; i++) {
IntegersHolder integersHolder = new IntegersHolder();
LongsHolder longsHolder = new LongsHolder();
loopNumbers(integersHolder);
loopNumbers(longsHolder);
}
}
}