1 /*
2  * Copyright (c) 2017, 2019, Red Hat, Inc. All rights reserved.
3  *
4  * This code is free software; you can redistribute it and/or modify it
5  * under the terms of the GNU General Public License version 2 only, as
6  * published by the Free Software Foundation.
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9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
11  * version 2 for more details (a copy is included in the LICENSE file that
12  * accompanied this code).
13  *
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23 
24 /*
25  * @test TestLoopMiningArguments
26  * @summary Test that loop mining arguments are sane
27  * @key gc
28  * @requires vm.gc.Shenandoah & !vm.graal.enabled
29  * @requires vm.flavor == "server"
30  * @library /test/lib
31  * @run driver TestLoopMiningArguments
32  */
33 
34 import java.util.*;
35 
36 import jdk.test.lib.Asserts;
37 import jdk.test.lib.process.ProcessTools;
38 import jdk.test.lib.process.OutputAnalyzer;
39 
40 public class TestLoopMiningArguments {
41 
testWith(String msg, boolean cls, int iters, String... args)42     public static void testWith(String msg, boolean cls, int iters, String... args) throws Exception {
43         String[] cmds = Arrays.copyOf(args, args.length + 2);
44         cmds[args.length] = "-XX:+PrintFlagsFinal";
45         cmds[args.length + 1] = "-version";
46         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(cmds);
47         OutputAnalyzer output = new OutputAnalyzer(pb.start());
48         output.shouldHaveExitValue(0);
49         output.shouldContain("UseCountedLoopSafepoints");
50         output.shouldContain("LoopStripMiningIter");
51 
52         Asserts.assertEQ(output.firstMatch("(.+?) UseCountedLoopSafepoints.+?= (.+?) (.+?)", 2), Boolean.toString(cls), msg + ", but got wrong CLS");
53         Asserts.assertEQ(output.firstMatch("(.+?) LoopStripMiningIter.+?= (.+?) (.+?)", 2), String.valueOf(iters), msg + ", but got wrong LSM");
54     }
55 
main(String[] args)56     public static void main(String[] args) throws Exception {
57         testWith("Shenandoah should have CLS and LSM enabled",
58                 true, 1000,
59                 "-XX:+UnlockExperimentalVMOptions",
60                 "-XX:+UseShenandoahGC"
61         );
62 
63         testWith("Shenandoah with +CLS should set LSM = 1",
64                 true, 1,
65                 "-XX:+UnlockExperimentalVMOptions",
66                 "-XX:+UseShenandoahGC",
67                 "-XX:+UseCountedLoopSafepoints"
68         );
69 
70         testWith("Shenandoah GC with +CLS should not override LSM>1",
71                 true, 10,
72                 "-XX:+UnlockExperimentalVMOptions",
73                 "-XX:+UseShenandoahGC",
74                 "-XX:LoopStripMiningIter=10",
75                 "-XX:+UseCountedLoopSafepoints"
76         );
77 
78         testWith("Shenandoah GC with +CLS should not override LSM=1",
79                 true, 1,
80                 "-XX:+UnlockExperimentalVMOptions",
81                 "-XX:+UseShenandoahGC",
82                 "-XX:LoopStripMiningIter=1",
83                 "-XX:+UseCountedLoopSafepoints"
84         );
85 
86         testWith("Shenandoah GC with +CLS should override LSM=0 to 1",
87                 true, 1,
88                 "-XX:+UnlockExperimentalVMOptions",
89                 "-XX:+UseShenandoahGC",
90                 "-XX:LoopStripMiningIter=0",
91                 "-XX:+UseCountedLoopSafepoints"
92         );
93 
94         testWith("Shenandoah GC with -CLS should set LSM = 0",
95                 false, 0,
96                 "-XX:+UnlockExperimentalVMOptions",
97                 "-XX:+UseShenandoahGC",
98                 "-XX:-UseCountedLoopSafepoints"
99         );
100 
101         testWith("Shenandoah GC with -CLS should override LSM to 0",
102                 false, 0,
103                 "-XX:+UnlockExperimentalVMOptions",
104                 "-XX:+UseShenandoahGC",
105                 "-XX:LoopStripMiningIter=10",
106                 "-XX:-UseCountedLoopSafepoints"
107         );
108     }
109 
110 }
111