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/*
* Copyright Amazon.com Inc. 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 8333791
* @requires os.arch=="aarch64" | os.arch=="riscv64" | os.arch=="x86_64" | os.arch=="amd64"
* @requires vm.gc.Parallel
* @requires vm.compiler2.enabled
* @summary Check stable field folding and barriers
* @modules java.base/jdk.internal.vm.annotation
* @library /test/lib /
* @run driver compiler.c2.irTests.stable.StableRefFinalTest
*/
package compiler.c2.irTests.stable;
import compiler.lib.ir_framework.*;
import jdk.test.lib.Asserts;
import jdk.internal.vm.annotation.Stable;
public class StableRefFinalTest {
public static void main(String[] args) {
TestFramework tf = new TestFramework();
tf.addTestClassesToBootClassPath();
tf.addFlags(
"-XX:+UnlockExperimentalVMOptions",
"-XX:CompileThreshold=100",
"-XX:-TieredCompilation",
"-XX:+UseParallelGC"
);
tf.start();
}
static final Integer INTEGER = 42;
static class Carrier {
@Stable
final Integer field;
@ForceInline
public Carrier(boolean init) {
field = init ? INTEGER : null;
}
}
static final Carrier BLANK_CARRIER = new Carrier(false);
static final Carrier INIT_CARRIER = new Carrier(true);
@Test
@IR(counts = { IRNode.LOAD, ">0" })
@IR(failOn = { IRNode.MEMBAR })
static int testNoFold() {
// Access should not be folded.
// No barriers expected for plain fields.
Integer i = BLANK_CARRIER.field;
return i != null ? i : 0;
}
@Test
@IR(failOn = { IRNode.LOAD, IRNode.MEMBAR })
static int testFold() {
// Access should be completely folded.
Integer i = INIT_CARRIER.field;
return i != null ? i : 0;
}
@Test
@IR(counts = { IRNode.MEMBAR_STORESTORE, "1" })
static Carrier testConstructorInit() {
// Only the header+final barrier.
return new Carrier(true);
}
}
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