05459df0c7
Use the compilation-local seed in 'StressLCM' and 'StressGCM' rather than the global one. As a consequence, these options use by default a fresh seed in every compilation, unless 'StressSeed=N' is specified, in which case they behave deterministically. Annotate tests that use 'StressLCM' and 'StressGCM' with the 'stress' and 'randomness' keys to reflect this change in default behavior. Reviewed-by: kvn, thartmann
111 lines
4.0 KiB
Java
111 lines
4.0 KiB
Java
/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @key stress randomness
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* @bug 8139771
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* @summary Eliminating CastPP nodes at Phis when they all come from a unique input may cause crash
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* @requires vm.gc=="Serial" | vm.gc=="Parallel"
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*
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* @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement
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* -XX:+UnlockDiagnosticVMOptions -XX:+IgnoreUnrecognizedVMOptions -XX:+StressGCM
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* compiler.controldependency.TestEliminatedCastPPAtPhi
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*
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*/
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package compiler.controldependency;
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public class TestEliminatedCastPPAtPhi {
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static TestEliminatedCastPPAtPhi saved;
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static TestEliminatedCastPPAtPhi saved_not_null;
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int f;
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static int test(TestEliminatedCastPPAtPhi obj, int[] array, boolean flag) {
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int ret = array[0] + array[20];
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saved = obj;
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if (obj == null) {
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return ret;
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}
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saved_not_null = obj;
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// empty loop to be optimized out. Delays range check smearing
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// for the array access below until the if diamond is
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// optimized out
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int i = 0;
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for (; i < 10; i++);
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ret += array[i];
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TestEliminatedCastPPAtPhi res;
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if (flag) {
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// load is optimized out and res is obj here
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res = saved;
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} else {
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// load is optimized out and res is non null CastPP of res here
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res = saved_not_null;
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}
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// null check + CastPP here for res field load below
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// 1) null check is pushed in the branches of the if above by
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// split through phi because res is non null in the second
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// branch and the null check can be optimized out in that
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// branch. The Castpp stays here.
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// 2) null check in the first branch is also optimized out
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// because a dominating null check is found (the explicit null
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// check at the beggining of the test)
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// 3) the Phi for the if above merges a CastPP'ed value and
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// the same value so it's optimized out and replaced by the
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// uncasted value: obj
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// 4) the if above has 2 empty branches so it's optimized
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// out. The control of the CastPP that is still here is now
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// the success branch of the range check for the array access
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// above
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// 5) the loop above is optimized out, i = 10, the range check
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// for the array access above is optimized out and all its
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// uses are replaced by the range check for the array accesses
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// at the beginning of the method. The castPP here is one of
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// the uses and so its control is now the range check at the
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// beginning of the method: the control of the CastPP bypasses
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// the explicit null check
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return ret + res.f;
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}
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static public void main(String[] args) {
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int[] array = new int[100];
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TestEliminatedCastPPAtPhi obj = new TestEliminatedCastPPAtPhi();
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for (int i = 0; i < 20000; i++) {
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test(obj, array, (i%2) == 0);
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}
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test(null, array, true);
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}
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}
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