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