119 lines
3.8 KiB
Java
119 lines
3.8 KiB
Java
/*
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* Copyright (c) 2024 Alibaba Group Holding Limited. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package compiler.c2.irTests.scalarReplacement;
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import compiler.lib.ir_framework.*;
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/*
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* @test
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* @bug 8333334
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* @summary Tests that dead barrier control flows do not affect the scalar replacement.
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* @library /test/lib /
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* @requires vm.compiler2.enabled
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* @requires vm.gc.G1
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* @run driver compiler.c2.irTests.scalarReplacement.ScalarReplacementWithGCBarrierTests
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*/
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public class ScalarReplacementWithGCBarrierTests {
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static class List {
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public Node head;
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public void push(int value) {
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Node n = new Node();
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n.value = value;
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n.next = head;
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head = n;
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}
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@ForceInline
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public Iter iter() {
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Iter iter = new Iter();
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iter.list = this;
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iter.n = head;
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iter.sum = 0;
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return iter;
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}
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}
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static class Node {
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public int value;
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public Node next;
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}
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static class Iter {
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public List list;
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public Node n;
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public Integer sum;
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@ForceInline
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public boolean next() {
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int lastSum = sum;
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while (sum - lastSum < 1000) {
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while (n != null && n.value < 30) n = n.next;
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if (n == null) return false;
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sum += n.value;
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n = n.next;
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}
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return true;
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}
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}
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private static final int SIZE = 1000;
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public static void main(String[] args) {
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// Must use G1 GC to ensure there is a pre-barrier
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// before the first field write.
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TestFramework.runWithFlags("-XX:+UseG1GC");
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}
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@Run(test = "testScalarReplacementWithGCBarrier")
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private void runner() {
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List list = new List();
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for (int i = 0; i < SIZE; i++) {
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list.push(i);
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}
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testScalarReplacementWithGCBarrier(list);
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}
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// Allocation of `Iter iter` should be eliminated by scalar replacement, and
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// the allocation of `Integer sum` can not be eliminated, so there should be
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// 1 allocation after allocations and locks elimination.
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//
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// Before the patch of JDK-8333334, both allocations of `Iter` and `Integer`
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// could not be eliminated.
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@Test
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@IR(phase = { CompilePhase.AFTER_PARSING }, counts = { IRNode.ALLOC, "1" })
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@IR(phase = { CompilePhase.INCREMENTAL_BOXING_INLINE }, counts = { IRNode.ALLOC, "2" })
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@IR(phase = { CompilePhase.ITER_GVN_AFTER_ELIMINATION }, counts = { IRNode.ALLOC, "1" })
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private int testScalarReplacementWithGCBarrier(List list) {
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Iter iter = list.iter();
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while (true) {
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while (iter.next()) {}
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if (list.head == null) break;
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list.head = list.head.next;
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iter.n = list.head;
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}
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return iter.sum;
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}
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}
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