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/*
* Copyright (c) 2018, Red Hat, Inc. 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 8212673
* @summary Node::eqv_uncast() shouldn't step over load barriers unconditionally
* @library /test/lib /
* @modules java.base/jdk.internal.misc
*
* @build sun.hotspot.WhiteBox
* @run driver ClassFileInstaller sun.hotspot.WhiteBox
* sun.hotspot.WhiteBox$WhiteBoxPermission
* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-UseOnStackReplacement -XX:-TieredCompilation -XX:-BackgroundCompilation EqvUncastStepOverBarrier
*/
import sun.hotspot.WhiteBox;
import java.lang.reflect.Method;
public class EqvUncastStepOverBarrier {
static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
private static Object field = new A();
public static void main(String[] args) throws Exception {
for (int i = 0; i < 20_000; i++) {
test();
test();
test_helper(null, 0);
}
Method m = EqvUncastStepOverBarrier.class.getDeclaredMethod("test");
WHITE_BOX.enqueueMethodForCompilation(m, 4);
if (!WHITE_BOX.isMethodCompiled(m, false)) {
throw new RuntimeException("Method compilation failed");
}
}
private static Object test() {
Object o = field;
if (o == null) {}
for (int i = 1; i < 100; i *= 2) {
int j = 0;
for (; j < 4; j++) ;
o = test_helper(o, j);
}
return o;
}
private static Object test_helper(Object o, int j) {
if (j == 4) {
A a = (A) o;
o = a;
} else {
o = new Object();
}
return o;
}
private static class A {
}
}
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