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/*
* Copyright (c) 2024, 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.runtime.safepoints;
import compiler.lib.ir_framework.*;
import java.lang.ref.SoftReference;
/**
* @test
* @summary Test that undefined values generated by MachTemp nodes (in this
* case, derived from G1 barriers) are not included in OopMaps.
* Extracted from java.lang.invoke.LambdaFormEditor::getInCache.
* @key randomness
* @library /test/lib /
* @requires vm.gc.G1 & vm.bits == 64 & vm.opt.final.UseCompressedOops == true
* @run driver compiler.runtime.safepoints.TestMachTempsAcrossSafepoints
*/
public class TestMachTempsAcrossSafepoints {
static class RefWithKey extends SoftReference<Object> {
final int key;
public RefWithKey(int key) {
super(new Object());
this.key = key;
}
@DontInline
@Override
public boolean equals(Object obj) {
return obj instanceof RefWithKey that && this.key == that.key;
}
}
public static void main(String[] args) throws Exception {
String inlineCmd = "-XX:CompileCommand=inline,java.lang.ref.SoftReference::get";
TestFramework.runWithFlags(inlineCmd, "-XX:+StressGCM", "-XX:+StressLCM", "-XX:StressSeed=1");
TestFramework.runWithFlags(inlineCmd, "-XX:+StressGCM", "-XX:+StressLCM");
}
@Test
@IR(counts = {IRNode.G1_LOAD_N, "1"}, phase = CompilePhase.FINAL_CODE)
@IR(counts = {IRNode.MACH_TEMP, ">= 1"}, phase = CompilePhase.FINAL_CODE)
@IR(counts = {IRNode.STATIC_CALL_OF_METHOD, "equals", "2"})
@IR(failOn = {IRNode.OOPMAP_WITH, "NarrowOop"})
static private Object test(RefWithKey key, RefWithKey[] refs) {
RefWithKey k = null;
// This loop causes the register allocator to not "rematerialize" all
// MachTemp nodes generated for the reference g1LoadN instruction below.
for (int i = 0; i < refs.length; i++) {
RefWithKey k0 = refs[0];
if (k0.equals(key)) {
k = k0;
}
}
if (k != null && !key.equals(k)) {
return null;
}
// The MachTemp node implementing the dst TEMP operand in the g1LoadN
// instruction corresponding to k.get() can be scheduled across the
// above call to RefWithKey::equals(), due to an unfortunate interaction
// of inaccurate basic block frequency estimation (emulated in this test
// by randomizing the GCM and LCM heuristics) and call-catch cleanup.
// Since narrow pointer MachTemp nodes are typed as narrow OOPs, this
// causes the oopmap builder to include the MachTemp node definition in
// the RefWithKey::equals() return oopmap.
return (k != null) ? k.get() : null;
}
@Run(test = "test")
@Warmup(0)
public void run() {
RefWithKey ref = new RefWithKey(42);
test(ref, new RefWithKey[]{ref});
}
}
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