1 /*
2 * Copyright (c) 2015, 2018, 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 package gc.g1.unloading.bytecode;
25
26 import java.io.BufferedWriter;
27 import java.io.File;
28 import java.io.FileWriter;
29 import java.io.IOException;
30 import java.util.ArrayList;
31 import java.util.List;
32
33 /*
34 * This class is compiled and invoke due the build to produce
35 * HumongousTemplateClass.java. The size of generated file is
36 * too large to store it in the repository.
37 */
38
39 public class HumongousTemplateClassGen {
40
41 private static final String CLASS_NAME = "HumongousTemplateClass";
42 private static final String PKG_NAME = "gc.g1.unloading.bytecode";
43 private static final String PKG_DIR_NAME = PKG_NAME.replace(".",
44 File.separator);
45 private static final int ITERATIONS = 1075;
46 private static final double MG = (Math.pow(1024, 2));
47 private static final int RECORD_COUNT = 16 * ITERATIONS + 10;
48
addFileTop(List<String> records)49 public static void addFileTop(List<String> records) {
50 records.add("package " + PKG_NAME + ";\n");
51 records.add("\n");
52 records.add("import java.util.*;\n");
53 records.add("\n");
54 records.add("public class " + CLASS_NAME + " {\n");
55 records.add(" public static void main() {\n");
56 records.add(" System.out.println(\"In humongous class \");\n");
57 records.add(" }");
58 records.add("\n");
59 }
60
addIteration(int itNum, List<String> records)61 public static void addIteration(int itNum, List<String> records) {
62 records.add(" public static Object public_static_object_" + itNum
63 + " = new Object();\n");
64 records.add(" protected static Object protected_static_object_" + itNum
65 + " = new Object();\n");
66 records.add(" private static Object private_static_Object_" + itNum
67 + " = new Object();\n");
68 records.add("\n");
69 records.add(" public static long public_static_long_" + itNum + ";\n");
70 records.add(" protected static long protected_static_long_" + itNum
71 + " = new Random().nextLong();\n");
72 records.add(" private static long private_static_long_" + itNum
73 + " = 42;\n");
74 records.add("\n");
75 records.add(" public Object public_object_" + itNum
76 + " = new Object();\n");
77 records.add(" protected Object protected_object_" + itNum
78 + " = new Object();\n");
79 records.add(" private Object private_Object_" + itNum
80 + " = new Object();\n");
81 records.add("\n");
82 records.add(" public long public_long_" + itNum + " = 43;\n");
83 records.add(" protected long protected_long_" + itNum + " = 44;\n");
84 records.add(" private long private_long_" + itNum
85 + " = new Random().nextLong();\n");
86 }
main(String[] args)87 public static void main(String[] args) throws Exception {
88 if (args.length < 1) {
89 System.out.println("Usage: HumongousTemplateClassGen "
90 + "<vm-testbase_src_folder>");
91 return;
92 }
93
94 List<String> records = new ArrayList<String>(RECORD_COUNT);
95 addFileTop(records);
96 for (int i = 1; i < ITERATIONS; i++) {
97 addIteration(i, records);
98 }
99 records.add("}");
100 writeBuffered(records, (int) (MG * 1), args[0]);
101 }
102
writeBuffered(List<String> records, int bufSize, String srcDir)103 private static void writeBuffered(List<String> records, int bufSize,
104 String srcDir) throws IOException {
105 String path = srcDir + File.separator + PKG_DIR_NAME + File.separator
106 + CLASS_NAME + ".java";
107 System.out.println("Path="+path);
108 File file = new File (path);
109 file.getParentFile().mkdirs();
110 file.createNewFile();
111 long start = System.currentTimeMillis();
112 FileWriter writer = new FileWriter(file);
113 BufferedWriter bufferedWriter = new BufferedWriter(writer, bufSize);
114
115 for (String record: records) {
116 bufferedWriter.write(record);
117 }
118 bufferedWriter.flush();
119 bufferedWriter.close();
120 long end = System.currentTimeMillis();
121 System.out.println((end - start) / 1000f + " seconds");
122 }
123 }
124