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