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/*
* Copyright (c) 2023, 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.
*/
/*
* @test
* @bug 8295486
* @summary Verify that constant folding of field loads observes consistent values during compilation.
* @library /test/lib /
* @modules java.base/jdk.internal.vm.annotation
* java.base/jdk.internal.misc
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run main/bootclasspath/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
* -XX:-TieredCompilation -Xbatch -XX:PerMethodRecompilationCutoff=-1
* -XX:CompileCommand=compileonly,compiler.stable.TestUnstableStable::test*
* compiler.stable.TestUnstableStable
*/
package compiler.stable;
import compiler.whitebox.CompilerWhiteBoxTest;
import java.lang.reflect.Method;
import jdk.internal.misc.Unsafe;
import jdk.internal.vm.annotation.Stable;
import jdk.test.whitebox.WhiteBox;
public class TestUnstableStable {
static final Unsafe U = Unsafe.getUnsafe();
static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
static final TestUnstableStable HOLDER = new TestUnstableStable();
@Stable Integer stableField = null;
static @Stable Integer staticStableField = null;
static @Stable Integer[] stableArray0 = new Integer[1];
static @Stable Integer[][] stableArray1 = new Integer[1][1];
static final Integer finalField = 43;
static final long FIELD_OFFSET;
static {
try {
FIELD_OFFSET = U.staticFieldOffset(TestUnstableStable.class.getDeclaredField("finalField"));
} catch (NoSuchFieldException e) {
throw new RuntimeException("Field not found", e);
}
}
static class Writer implements Runnable {
public void run() {
while (true) {
HOLDER.stableField = null;
HOLDER.stableField = 42;
HOLDER.stableField = 43;
staticStableField = null;
staticStableField = 42;
staticStableField = 43;
stableArray0[0] = null;
stableArray0[0] = 42;
stableArray0[0] = 43;
stableArray1[0] = null;
Integer[] tmp1 = {null};
stableArray1[0] = tmp1;
Integer[] tmp2 = {42};
stableArray1[0] = tmp2;
Integer[] tmp3 = {43};
stableArray1[0] = tmp3;
stableArray1[0][0] = null;
stableArray1[0][0] = 42;
stableArray1[0][0] = 43;
U.putObject(TestUnstableStable.class, FIELD_OFFSET, null);
U.putObject(TestUnstableStable.class, FIELD_OFFSET, 42);
U.putObject(TestUnstableStable.class, FIELD_OFFSET, 43);
}
}
}
static Object testNonStatic() {
// Trigger PhaseCCP and LoadNode::Value -> Type::make_constant_from_field
// which may observe different values of the stable field when invoked twice.
Integer val = HOLDER.stableField;
if (val == null) {
val = null;
}
return val;
}
static Object testStatic() {
Integer val = staticStableField;
if (val == null) {
val = null;
}
return val;
}
static Object testArray0() {
Integer val = stableArray0[0];
if (val == null) {
val = null;
}
return val;
}
static Object testArray1() {
Integer[] val = stableArray1[0];
if (val == null) {
val = null;
} else {
return val[0];
}
return val;
}
static Object testFinal() {
Integer val = finalField;
if (val == null) {
val = null;
}
return val;
}
public static void main(String[] args) throws Exception {
Thread t = new Thread(new Writer());
t.start();
Method testNonStatic = TestUnstableStable.class.getDeclaredMethod("testNonStatic");
Method testStatic = TestUnstableStable.class.getDeclaredMethod("testStatic");
Method testArray0 = TestUnstableStable.class.getDeclaredMethod("testArray0");
Method testArray1 = TestUnstableStable.class.getDeclaredMethod("testArray1");
Method testFinal = TestUnstableStable.class.getDeclaredMethod("testFinal");
testFinal();
for (int i = 0; i < 1000; ++i) {
WHITE_BOX.deoptimizeMethod(testNonStatic, false);
WHITE_BOX.enqueueMethodForCompilation(testNonStatic, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);
WHITE_BOX.deoptimizeMethod(testStatic, false);
WHITE_BOX.enqueueMethodForCompilation(testStatic, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);
WHITE_BOX.deoptimizeMethod(testArray0, false);
WHITE_BOX.enqueueMethodForCompilation(testArray0, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);
WHITE_BOX.deoptimizeMethod(testArray1, false);
WHITE_BOX.enqueueMethodForCompilation(testArray1, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);
WHITE_BOX.deoptimizeMethod(testFinal, false);
WHITE_BOX.enqueueMethodForCompilation(testFinal, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);
}
}
}
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