126 lines
4.4 KiB
Java
126 lines
4.4 KiB
Java
/*
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* Copyright (c) 2022, 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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package compiler.vectorapi;
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import jdk.incubator.vector.IntVector;
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import jdk.test.lib.Asserts;
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/*
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* @test
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* @bug 8276064 8271600
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* @summary Verify that CheckCastPPs with raw oop inputs are not floating below a safepoint.
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* @library /test/lib
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* @modules jdk.incubator.vector
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* @run main/othervm -XX:-TieredCompilation -Xbatch
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* -XX:CompileCommand=compileonly,compiler.vectorapi.TestRawOopAtSafepoint::test*
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* -XX:CompileCommand=dontinline,compiler.vectorapi.TestRawOopAtSafepoint::safepoint
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* compiler.vectorapi.TestRawOopAtSafepoint
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*/
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public class TestRawOopAtSafepoint {
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static int iFld = 42;
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public static void safepoint(boolean gc) {
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if (gc) {
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// Give the GC a chance to move the IntVector object on the heap
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// and thus invalidate the oop if it's not in the oopMap.
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System.gc();
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}
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}
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// Loop unswitching moves a CheckCastPP out of a loop such that the raw oop
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// input crosses a safepoint. We then SIGSEGV after the GC moved the IntVector
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// object when deferencing the now stale oop.
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public static IntVector test1(boolean flag, boolean gc) {
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IntVector vector = null;
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for (int i = 0; i < 100; i++) {
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// Trigger loop unswitching
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if (flag) {
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iFld++;
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}
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// Allocate an IntVector that will be scalarized in the
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// safepoint debug info but not in the return.
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vector = IntVector.zero(IntVector.SPECIES_MAX);
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safepoint((i == 99) && gc);
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}
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return vector;
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}
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// Same as test1 but we hit an assert in OopFlow::build_oop_map instead.
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public static IntVector test2(boolean flag, boolean gc) {
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for (int i = 0; i < 100; i++) {
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// Trigger loop unswitching
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if (flag) {
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iFld++;
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}
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IntVector vector = IntVector.zero(IntVector.SPECIES_MAX);
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safepoint((i == 99) && gc);
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if (flag) {
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return vector;
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}
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}
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return IntVector.zero(IntVector.SPECIES_MAX);
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}
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// Same as test1 but PhaseIdealLoop::try_sink_out_of_loop moves the CheckCastPP.
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public static IntVector test3(boolean flag, boolean gc) {
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IntVector vector = null;
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for (int i = 0; i < 10; i++) {
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vector = IntVector.zero(IntVector.SPECIES_MAX);
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safepoint((i == 9) && gc);
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}
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return vector;
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}
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// Same as test2 but PhaseIdealLoop::try_sink_out_of_loop moves the CheckCastPP.
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public static IntVector test4(boolean flag, boolean gc) {
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IntVector vector = null;
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for (int i = 0; i < 2; i++) {
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vector = IntVector.zero(IntVector.SPECIES_MAX);
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safepoint((i == 9) && gc);
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}
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return vector;
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}
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public static void main(String[] args) {
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int sum = 0;
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for (int i = 0; i < 15_000; ++i) {
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boolean flag = ((i % 2) == 0);
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boolean gc = (i > 14_500);
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IntVector vector1 = test1(flag, gc);
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sum += vector1.lane(0);
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IntVector vector2 = test2(flag, gc);
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sum += vector2.lane(0);
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IntVector vector3 = test3(flag, gc);
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sum += vector3.lane(0);
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IntVector vector4 = test4(flag, gc);
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sum += vector4.lane(0);
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}
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Asserts.assertEQ(sum, 0);
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}
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}
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