1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/*
* Copyright Amazon.com Inc. 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.c2.irTests.gc;
import jdk.test.lib.Asserts;
import compiler.lib.ir_framework.*;
import jdk.test.whitebox.gc.GC;
import java.lang.ref.*;
import java.util.*;
/*
* @test
* @bug 8329597
* @summary Test that Reference.clear intrinsics are properly handled
* @library /test/lib /
* @build jdk.test.whitebox.WhiteBox
* @requires vm.compiler2.enabled
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI compiler.c2.irTests.gc.ReferenceClearTests
*/
public class ReferenceClearTests {
private static String[] args(String... add) {
List<String> args = new ArrayList<>();
// Use PerMethodTrapLimit=0 to compile all branches in the intrinsics.
args.add("-XX:PerMethodTrapLimit=0");
// Forcefully inline all methods to reach the intrinsic code.
args.add("-XX:CompileCommand=inline,compiler.c2.irTests.gc.ReferenceClearTests::*");
args.add("-XX:CompileCommand=inline,java.lang.ref.Reference::*");
args.add("-XX:CompileCommand=inline,java.lang.ref.PhantomReference::*");
// Mix in test config code.
args.addAll(Arrays.asList(add));
return args.toArray(new String[0]);
}
public static void main(String[] args) {
TestFramework framework = new TestFramework();
int idx = 0;
if (GC.isSelectedErgonomically() && GC.Serial.isSupported()) {
// Serial does not have SATB/keep-alive barriers at all.
// There are inter-generational barriers on stores, but they are
// folded away for null stores like clear().
framework.addScenarios(new Scenario(idx++, args(
"-XX:+UseSerialGC"
)));
}
if (GC.isSelectedErgonomically() && GC.Parallel.isSupported()) {
// Parallel does not have SATB/keep-alive barriers at all.
// There are inter-generational barriers on stores, but they
// should be folded away for null stores like clear().
framework.addScenarios(new Scenario(idx++, args(
"-XX:+UseParallelGC"
)));
}
if (GC.isSelectedErgonomically() && GC.G1.isSupported()) {
// G1 does not have barriers in C2 IR.
framework.addScenarios(new Scenario(idx++, args(
"-XX:+UseG1GC"
)));
}
if (GC.isSelectedErgonomically() && GC.Shenandoah.isSupported()) {
// Shenandoah has SATB/keep-alive barriers, but they should not be
// present clear()-s. There are load-reference barriers, which would
// confuse the tests, so we enable only SATB barriers.
framework.addScenarios(new Scenario(idx++, args(
"-XX:+UnlockDiagnosticVMOptions",
"-XX:ShenandoahGCMode=passive",
"-XX:+ShenandoahSATBBarrier",
"-XX:+UseShenandoahGC"
)));
}
if (GC.isSelectedErgonomically() && GC.Z.isSupported()) {
// Z does not have barriers in C2 IR.
framework.addScenarios(new Scenario(idx++, args(
"-XX:+UseZGC"
)));
}
framework.start();
}
static final Object REF = new Object();
static final SoftReference<Object> SR = new SoftReference<>(REF);
static final WeakReference<Object> WR = new WeakReference<>(REF);
static final PhantomReference<Object> PR = new PhantomReference<>(REF, null);
// We assert there is only a single load and a single store of Reference.referent.
// This serves as signal that no GC barriers are emitted in IR.
@Test
@IR(counts = { IRNode.STORE, "1",
IRNode.LOAD, "1" })
public void soft() {
SR.clear();
}
@Test
@IR(counts = { IRNode.STORE, "1",
IRNode.LOAD, "1" })
public void weak() {
WR.clear();
}
@Test
@IR(counts = { IRNode.STORE, "1",
IRNode.LOAD, "1" })
public void phantom() {
PR.clear();
}
}
|
