1 /*
2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 /**
26 * @test
27 * @bug 6869327
28 * @summary Test that C2 flag UseCountedLoopSafepoints ensures a safepoint is kept in a CountedLoop
29 * @library /test/lib /
30 * @requires vm.compMode != "Xint" & vm.flavor == "server" & (vm.opt.TieredStopAtLevel == null | vm.opt.TieredStopAtLevel == 4) & vm.debug == true
31 * @requires !vm.emulatedClient
32 * @modules java.base/jdk.internal.misc
33 * @build sun.hotspot.WhiteBox
34 * @run driver ClassFileInstaller sun.hotspot.WhiteBox
35 * sun.hotspot.WhiteBox$WhiteBoxPermission
36 * @run driver compiler.loopopts.UseCountedLoopSafepointsTest
37 */
38
39 package compiler.loopopts;
40
41 import jdk.test.lib.Platform;
42 import jdk.test.lib.process.ProcessTools;
43 import jdk.test.lib.process.OutputAnalyzer;
44 import java.util.List;
45 import java.util.ArrayList;
46 import java.util.Arrays;
47 import java.util.Collections;
48 import jdk.test.lib.Asserts;
49
50 /* Idea of this test is to check if ideal graph has CountedLoopEnd->SafePoint edge in case
51 of UseCountedLoopSafepoint enabled and has no such edge in case it's disabled. Restricting
52 compilation to testMethod only will leave only one counted loop (the one in testedMethod) */
53 public class UseCountedLoopSafepointsTest {
54
55 public static void main (String args[]) {
56 check(true); // check ideal graph with UseCountedLoopSafepoint enabled
57 check(false); // ... and disabled
58 }
59
60 private static void check(boolean enabled) {
61 OutputAnalyzer oa;
62 try {
63 oa = ProcessTools.executeTestJvm("-XX:+UnlockDiagnosticVMOptions", "-Xbootclasspath/a:.",
64 "-XX:" + (enabled ? "+" : "-") + "UseCountedLoopSafepoints",
65 "-XX:LoopStripMiningIter=" + (enabled ? "1" : "0"), "-XX:+WhiteBoxAPI",
66 "-XX:-Inline", "-Xbatch", "-XX:+PrintIdeal", "-XX:LoopUnrollLimit=0",
67 "-XX:CompileOnly=" + UseCountedLoopSafepoints.class.getName() + "::testMethod",
68 UseCountedLoopSafepoints.class.getName());
69 } catch (Exception e) {
70 throw new Error("Exception launching child for case enabled=" + enabled + " : " + e, e);
71 }
72 oa.shouldHaveExitValue(0);
73 // parse output in seach of SafePoint and CountedLoopEnd nodes
74 List<Node> safePoints = new ArrayList<>();
75 List<Node> loopEnds = new ArrayList<>();
76 for (String line : oa.getOutput().split("\\n")) {
77 int separatorIndex = line.indexOf("\t===");
78 if (separatorIndex > -1) {
79 String header = line.substring(0, separatorIndex);
80 if (header.endsWith("\tSafePoint")) {
81 safePoints.add(new Node("SafePoint", line));
82 } else if (header.endsWith("\tCountedLoopEnd")) {
83 loopEnds.add(new Node("CountedLoopEnd", line));
84 }
85 }
86 }
87 // now, find CountedLoopEnd -> SafePoint edge
88 boolean found = false;
89 for (Node loopEnd : loopEnds) {
90 found |= loopEnd.to.stream()
91 .filter(id -> nodeListHasElementWithId(safePoints, id))
92 .findAny()
93 .isPresent();
94 }
95 Asserts.assertEQ(enabled, found, "Safepoint " + (found ? "" : "not ") + "found");
96 }
97
98 private static boolean nodeListHasElementWithId(List<Node> list, int id) {
99 return list.stream()
100 .filter(node -> node.id == id)
101 .findAny()
102 .isPresent();
103 }
104
105 private static class Node {
106 public final int id;
107 public final List<Integer> from;
108 public final List<Integer> to;
109
110 public Node(String name, String str) {
111 List<Integer> tmpFrom = new ArrayList<>();
112 List<Integer> tmpTo = new ArrayList<>();
113 // parse string like: " $id $name === $to1 $to2 ... [[ $from1 $from2 ... ]] $anything"
114 // example: 318 SafePoint === 317 1 304 1 1 10 308 [[ 97 74 ]] ...
115 id = Integer.parseInt(str.substring(1, str.indexOf(name)).trim());
116 Arrays.stream(str.substring(str.indexOf("===") + 4, str.indexOf("[[")).trim().split("\\s+"))
117 .map(Integer::parseInt)
118 .forEach(tmpTo::add);
119 Arrays.stream(str.substring(str.indexOf("[[") + 3, str.indexOf("]]")).trim().split("\\s+"))
120 .map(Integer::parseInt)
121 .forEach(tmpFrom::add);
122 this.from = Collections.unmodifiableList(tmpFrom);
123 this.to = Collections.unmodifiableList(tmpTo);
124 }
125 }
126 }