1 /*
2 * Copyright (c) 2013, 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 sun.management.ManagementFactoryHelper;
25 import com.sun.management.HotSpotDiagnosticMXBean;
26 import com.sun.management.VMOption;
27
28 import java.util.regex.Matcher;
29 import java.util.regex.Pattern;
30 import java.util.ArrayList;
31 import java.util.Arrays;
32
33 import com.oracle.java.testlibrary.*;
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 getClassMetaspaceSize() {
46 HotSpotDiagnosticMXBean diagnostic = ManagementFactoryHelper.getDiagnosticMXBean();
47
48 VMOption option = diagnostic.getVMOption("ClassMetaspaceSize");
49 return Long.parseLong(option.getValue());
50 }
51
52
53 public static long getMaxHeapForCompressedOops(String[] vmargs) throws Exception {
54 OutputAnalyzer output = runWhiteBoxTest(vmargs, DetermineMaxHeapForCompressedOops.class.getName(), new String[] {}, false);
55 return Long.parseLong(output.getStdout());
56 }
57
58 public static boolean is64bitVM() {
59 String val = System.getProperty("sun.arch.data.model");
60 if (val == null) {
61 throw new RuntimeException("Could not read sun.arch.data.model");
62 }
63 if (val.equals("64")) {
64 return true;
65 } else if (val.equals("32")) {
66 return false;
67 }
68 throw new RuntimeException("Unexpected value " + val + " of sun.arch.data.model");
69 }
70
71 /**
72 * Executes a new VM process with the given class and parameters.
73 * @param vmargs Arguments to the VM to run
74 * @param classname Name of the class to run
75 * @param arguments Arguments to the class
76 * @param useTestDotJavaDotOpts Use test.java.opts as part of the VM argument string
77 * @return The OutputAnalyzer with the results for the invocation.
78 */
79 public static OutputAnalyzer runWhiteBoxTest(String[] vmargs, String classname, String[] arguments, boolean useTestDotJavaDotOpts) throws Exception {
80 ArrayList<String> finalargs = new ArrayList<String>();
81
82 String[] whiteboxOpts = new String[] {
83 "-Xbootclasspath/a:.",
84 "-XX:+UnlockDiagnosticVMOptions", "-XX:+WhiteBoxAPI",
85 "-cp", System.getProperty("java.class.path"),
86 };
87
88 if (useTestDotJavaDotOpts) {
89 // System.getProperty("test.java.opts") is '' if no options is set,
90 // we need to skip such a result
91 String[] externalVMOpts = new String[0];
92 if (System.getProperty("test.java.opts") != null && System.getProperty("test.java.opts").length() != 0) {
93 externalVMOpts = System.getProperty("test.java.opts").split(" ");
94 }
95 finalargs.addAll(Arrays.asList(externalVMOpts));
96 }
97
98 finalargs.addAll(Arrays.asList(vmargs));
99 finalargs.addAll(Arrays.asList(whiteboxOpts));
100 finalargs.add(classname);
101 finalargs.addAll(Arrays.asList(arguments));
102
103 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(finalargs.toArray(new String[0]));
104 OutputAnalyzer output = new OutputAnalyzer(pb.start());
105 output.shouldHaveExitValue(0);
106 return output;
107 }
108
109 private static String[] join(String[] part1, String part2) {
110 ArrayList<String> result = new ArrayList<String>();
111 result.addAll(Arrays.asList(part1));
112 result.add(part2);
113 return result.toArray(new String[0]);
114 }
115
116 public static void checkCompressedOopsErgo(String[] gcflags) throws Exception {
117 long maxHeapForCompressedOops = getMaxHeapForCompressedOops(gcflags);
118
119 checkUseCompressedOops(gcflags, maxHeapForCompressedOops, true);
120 checkUseCompressedOops(gcflags, maxHeapForCompressedOops - 1, true);
121 checkUseCompressedOops(gcflags, maxHeapForCompressedOops + 1, false);
122
123 // the use of HeapBaseMinAddress should not change the outcome
124 checkUseCompressedOops(join(gcflags, "-XX:HeapBaseMinAddress=32G"), maxHeapForCompressedOops, true);
125 checkUseCompressedOops(join(gcflags, "-XX:HeapBaseMinAddress=32G"), maxHeapForCompressedOops - 1, true);
126 checkUseCompressedOops(join(gcflags, "-XX:HeapBaseMinAddress=32G"), maxHeapForCompressedOops + 1, false);
127
128 // use a different object alignment
129 maxHeapForCompressedOops = getMaxHeapForCompressedOops(join(gcflags, "-XX:ObjectAlignmentInBytes=16"));
130
131 checkUseCompressedOops(join(gcflags, "-XX:ObjectAlignmentInBytes=16"), maxHeapForCompressedOops, true);
132 checkUseCompressedOops(join(gcflags, "-XX:ObjectAlignmentInBytes=16"), maxHeapForCompressedOops - 1, true);
133 checkUseCompressedOops(join(gcflags, "-XX:ObjectAlignmentInBytes=16"), maxHeapForCompressedOops + 1, false);
134
135 // use a different ClassMetaspaceSize
136 String classMetaspaceSizeArg = "-XX:ClassMetaspaceSize=" + 2 * getClassMetaspaceSize();
137 maxHeapForCompressedOops = getMaxHeapForCompressedOops(join(gcflags, classMetaspaceSizeArg));
138
139 checkUseCompressedOops(join(gcflags, classMetaspaceSizeArg), maxHeapForCompressedOops, true);
140 checkUseCompressedOops(join(gcflags, classMetaspaceSizeArg), maxHeapForCompressedOops - 1, true);
141 checkUseCompressedOops(join(gcflags, classMetaspaceSizeArg), maxHeapForCompressedOops + 1, false);
142 }
143
144 private static void checkUseCompressedOops(String[] args, long heapsize, boolean expectUseCompressedOops) throws Exception {
145 ArrayList<String> finalargs = new ArrayList<String>();
146 finalargs.addAll(Arrays.asList(args));
147 finalargs.add("-Xmx" + heapsize);
148 finalargs.add("-XX:+PrintFlagsFinal");
149 finalargs.add("-version");
150
151 String output = expectValid(finalargs.toArray(new String[0]));
152
153 boolean actualUseCompressedOops = getFlagBoolValue(" UseCompressedOops", output);
154
155 if (expectUseCompressedOops != actualUseCompressedOops) {
156 throw new RuntimeException("Expected use of compressed oops: " + expectUseCompressedOops + " but was: " + actualUseCompressedOops);
157 }
158 }
159
160 private static boolean getFlagBoolValue(String flag, String where) {
161 Matcher m = Pattern.compile(flag + "\\s+:?= (true|false)").matcher(where);
162 if (!m.find()) {
163 throw new RuntimeException("Could not find value for flag " + flag + " in output string");
164 }
165 String match = m.group();
166 return match.substring(match.lastIndexOf(" ") + 1, match.length()).equals("true");
167 }
168
169 private static String expect(String[] flags, boolean hasWarning, boolean hasError, int errorcode) throws Exception {
170 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags);
171 OutputAnalyzer output = new OutputAnalyzer(pb.start());
172 output.shouldHaveExitValue(errorcode);
173 return output.getStdout();
174 }
175
176 private static String expectValid(String[] flags) throws Exception {
177 return expect(flags, false, false, 0);
178 }
179 }
180