1 /*
2 * Copyright (c) 2013, 2015,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 import com.sun.management.HotSpotDiagnosticMXBean;
25 import com.sun.management.VMOption;
26
27 import java.util.regex.Matcher;
28 import java.util.regex.Pattern;
29 import java.util.ArrayList;
30 import java.util.Arrays;
31
32 import jdk.test.lib.*;
33 import java.lang.management.ManagementFactory;
34 import sun.hotspot.WhiteBox;
35
36 class DetermineMaxHeapForCompressedOops {
37 public static void main(String[] args) throws Exception {
38 WhiteBox wb = WhiteBox.getWhiteBox();
39 System.out.print(wb.getCompressedOopsMaxHeapSize());
40 }
41 }
42
43 class TestUseCompressedOopsErgoTools {
44
45 private static long getCompressedClassSpaceSize() {
46 HotSpotDiagnosticMXBean diagnostic =
47 ManagementFactory.getPlatformMXBean(HotSpotDiagnosticMXBean.class);
48
49 VMOption option = diagnostic.getVMOption("CompressedClassSpaceSize");
50 return Long.parseLong(option.getValue());
51 }
52
53
54 public static long getMaxHeapForCompressedOops(String[] vmargs) throws Exception {
55 OutputAnalyzer output = runWhiteBoxTest(vmargs, DetermineMaxHeapForCompressedOops.class.getName(), new String[] {}, false);
56 return Long.parseLong(output.getStdout());
57 }
58
59 public static boolean is64bitVM() {
60 String val = System.getProperty("sun.arch.data.model");
61 if (val == null) {
62 throw new RuntimeException("Could not read sun.arch.data.model");
63 }
64 if (val.equals("64")) {
65 return true;
66 } else if (val.equals("32")) {
67 return false;
68 }
69 throw new RuntimeException("Unexpected value " + val + " of sun.arch.data.model");
70 }
71
72 /**
73 * Executes a new VM process with the given class and parameters.
74 * @param vmargs Arguments to the VM to run
75 * @param classname Name of the class to run
76 * @param arguments Arguments to the class
77 * @param useTestDotJavaDotOpts Use test.java.opts as part of the VM argument string
78 * @return The OutputAnalyzer with the results for the invocation.
79 */
80 public static OutputAnalyzer runWhiteBoxTest(String[] vmargs, String classname, String[] arguments, boolean useTestDotJavaDotOpts) throws Exception {
81 ArrayList<String> finalargs = new ArrayList<String>();
82
83 String[] whiteboxOpts = new String[] {
84 "-Xbootclasspath/a:.",
85 "-XX:+UnlockDiagnosticVMOptions", "-XX:+WhiteBoxAPI",
86 "-cp", System.getProperty("java.class.path"),
87 };
88
89 if (useTestDotJavaDotOpts) {
90 // System.getProperty("test.java.opts") is '' if no options is set,
91 // we need to skip such a result
92 String[] externalVMOpts = new String[0];
93 if (System.getProperty("test.java.opts") != null && System.getProperty("test.java.opts").length() != 0) {
94 externalVMOpts = System.getProperty("test.java.opts").split(" ");
95 }
96 finalargs.addAll(Arrays.asList(externalVMOpts));
97 }
98
99 finalargs.addAll(Arrays.asList(vmargs));
100 finalargs.addAll(Arrays.asList(whiteboxOpts));
101 finalargs.add(classname);
102 finalargs.addAll(Arrays.asList(arguments));
103
104 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(finalargs.toArray(new String[0]));
105 OutputAnalyzer output = new OutputAnalyzer(pb.start());
106 output.shouldHaveExitValue(0);
107 return output;
108 }
109
110 private static String[] join(String[] part1, String part2) {
111 ArrayList<String> result = new ArrayList<String>();
112 result.addAll(Arrays.asList(part1));
113 result.add(part2);
114 return result.toArray(new String[0]);
115 }
116
117 public static void checkCompressedOopsErgo(String[] gcflags) throws Exception {
118 long maxHeapForCompressedOops = getMaxHeapForCompressedOops(gcflags);
119
120 checkUseCompressedOops(gcflags, maxHeapForCompressedOops, true);
121 checkUseCompressedOops(gcflags, maxHeapForCompressedOops - 1, true);
122 checkUseCompressedOops(gcflags, maxHeapForCompressedOops + 1, false);
123
124 // the use of HeapBaseMinAddress should not change the outcome
125 checkUseCompressedOops(join(gcflags, "-XX:HeapBaseMinAddress=32G"), maxHeapForCompressedOops, true);
126 checkUseCompressedOops(join(gcflags, "-XX:HeapBaseMinAddress=32G"), maxHeapForCompressedOops - 1, true);
127 checkUseCompressedOops(join(gcflags, "-XX:HeapBaseMinAddress=32G"), maxHeapForCompressedOops + 1, false);
128
129 // use a different object alignment
130 maxHeapForCompressedOops = getMaxHeapForCompressedOops(join(gcflags, "-XX:ObjectAlignmentInBytes=16"));
131
132 checkUseCompressedOops(join(gcflags, "-XX:ObjectAlignmentInBytes=16"), maxHeapForCompressedOops, true);
133 checkUseCompressedOops(join(gcflags, "-XX:ObjectAlignmentInBytes=16"), maxHeapForCompressedOops - 1, true);
134 checkUseCompressedOops(join(gcflags, "-XX:ObjectAlignmentInBytes=16"), maxHeapForCompressedOops + 1, false);
135
136 // use a different CompressedClassSpaceSize
137 String compressedClassSpaceSizeArg = "-XX:CompressedClassSpaceSize=" + 2 * getCompressedClassSpaceSize();
138 maxHeapForCompressedOops = getMaxHeapForCompressedOops(join(gcflags, compressedClassSpaceSizeArg));
139
140 checkUseCompressedOops(join(gcflags, compressedClassSpaceSizeArg), maxHeapForCompressedOops, true);
141 checkUseCompressedOops(join(gcflags, compressedClassSpaceSizeArg), maxHeapForCompressedOops - 1, true);
142 checkUseCompressedOops(join(gcflags, compressedClassSpaceSizeArg), maxHeapForCompressedOops + 1, false);
143 }
144
145 private static void checkUseCompressedOops(String[] args, long heapsize, boolean expectUseCompressedOops) throws Exception {
146 ArrayList<String> finalargs = new ArrayList<String>();
147 finalargs.addAll(Arrays.asList(args));
148 finalargs.add("-Xmx" + heapsize);
149 finalargs.add("-XX:+PrintFlagsFinal");
150 finalargs.add("-version");
151
152 String output = expectValid(finalargs.toArray(new String[0]));
153
154 boolean actualUseCompressedOops = getFlagBoolValue(" UseCompressedOops", output);
155
156 Asserts.assertEQ(expectUseCompressedOops, actualUseCompressedOops);
157 }
158
159 private static boolean getFlagBoolValue(String flag, String where) {
160 Matcher m = Pattern.compile(flag + "\\s+:?= (true|false)").matcher(where);
161 if (!m.find()) {
162 throw new RuntimeException("Could not find value for flag " + flag + " in output string");
163 }
164 return m.group(1).equals("true");
165 }
166
167 private static String expect(String[] flags, boolean hasWarning, boolean hasError, int errorcode) throws Exception {
168 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags);
169 OutputAnalyzer output = new OutputAnalyzer(pb.start());
170 output.shouldHaveExitValue(errorcode);
171 return output.getStdout();
172 }
173
174 private static String expectValid(String[] flags) throws Exception {
175 return expect(flags, false, false, 0);
176 }
177 }