1 /*
2 * Copyright (c) 2010, 2012, 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 import java.io.File;
24 import java.io.IOException;
25
26 /*
27 * @test
28 * @bug 6762191
29 * @summary Setting stack size to 16K causes segmentation fault
30 * @compile TooSmallStackSize.java
31 * @run main TooSmallStackSize
32 */
33
34 /*
35 * The primary purpose of this test is to make sure we can run with a 16k stack
36 * size without crashing. Also this test will determine the minimum allowed
37 * stack size for the platform (as provided by the JVM error message when a very
38 * small is used), and then verify that the JVM can be launched with that stack
39 * size without a crash or any error messages.
40 */
41
42 public class TooSmallStackSize extends TestHelper {
43 /* for debugging. Normally false. */
44 static final boolean verbose = false;
45
46 static void printTestOutput(TestResult tr) {
47 System.out.println("*** exitValue = " + tr.exitValue);
48 for (String x : tr.testOutput) {
49 System.out.println(x);
50 }
51 }
52
53 /*
54 * Returns the minimum stack size this platform will allowed based on the
55 * contents of the error message the JVM outputs when too small of a
56 * -Xss size was used.
57 *
58 * The TestResult argument must containthe result of having already run
59 * the JVM with too small of a stack size.
60 */
61 static String getMinStackAllowed(TestResult tr) {
62 /*
63 * The JVM output will contain in one of the lines:
64 * "The stack size specified is too small, Specify at least 100k"
65 * Although the actual size will vary. We need to extract this size
66 * string from the output and return it.
67 */
68 String matchStr = "Specify at least ";
69 for (String x : tr.testOutput) {
70 int match_idx = x.indexOf(matchStr);
71 if (match_idx >= 0) {
72 int size_start_idx = match_idx + matchStr.length();
73 int k_start_idx = x.indexOf("k", size_start_idx);
74 return x.substring(size_start_idx, k_start_idx + 1); // include the "k"
75 }
76 }
77
78 System.out.println("FAILED: Could not get the stack size from the output");
79 throw new RuntimeException("test fails");
80 }
81
82 /*
83 * Run the JVM with the specified stack size.
84 *
85 * Returns the mimumum allowed stack size gleaned from the error message,
86 * if there is an error message. Otherwise returns the stack size passed in.
87 */
88 static String checkStack(String stackSize) throws IOException {
89 String min_stack_allowed;
90 TestResult tr;
91
92 if (verbose) System.out.println("*** Testing " + stackSize);
93 tr = doExec(javaCmd, "-Xss" + stackSize, "-version");
94 if (verbose) printTestOutput(tr);
95
96 if (tr.isOK()) {
97 System.out.println("PASSED: got no error message with stack size of " + stackSize);
98 min_stack_allowed = stackSize;
99 } else {
100 if (tr.contains("The stack size specified is too small")) {
101 System.out.println("PASSED: got expected error message with stack size of " + stackSize);
102 min_stack_allowed = getMinStackAllowed(tr);
103 } else {
104 // Likely a crash
105 System.out.println("FAILED: Did not get expected error message with stack size of " + stackSize);
106 throw new RuntimeException("test fails");
107 }
108 }
109
110 return min_stack_allowed;
111 }
112
113 /*
114 * Run the JVM with the minimum allowed stack size. This should always succeed.
115 */
116 static void checkMinStackAllowed(String stackSize) throws IOException {
117 TestResult tr = null;
118
119 if (verbose) System.out.println("*** Testing " + stackSize);
120 tr = doExec(javaCmd, "-Xss" + stackSize, "-version");
121 if (verbose) printTestOutput(tr);
122
123 if (tr.isOK()) {
124 System.out.println("PASSED: VM launched with minimum allowed stack size of " + stackSize);
125 } else {
126 // Likely a crash
127 System.out.println("FAILED: VM failed to launch with minimum allowed stack size of " + stackSize);
128 throw new RuntimeException("test fails");
129 }
130 }
131
132 public static void main(String... args) {
133 try {
134 /*
135 * The result of a 16k stack size should be a quick exit with a complaint
136 * that the stack size is too small. However, for some win32 builds, the
137 * stack is always at least 64k, and this also sometimes is the minimum
138 * allowed size, so we won't see an error in this case.
139 *
140 * This test case will also produce a crash on some platforms if the fix
141 * for 6762191 is not yet in place.
142 */
143 checkStack("16k");
144
145 /*
146 * Try with a 32k stack size, which is the size that the launcher will
147 * set to if you try setting to anything smaller. This should produce the same
148 * result as setting to 16k if the fix for 6762191 is in place.
149 */
150 String min_stack_allowed = checkStack("32k");
151
152 /*
153 * Try again with a the minimum stack size that was given in the error message
154 */
155 checkMinStackAllowed(min_stack_allowed);
156 } catch (IOException ioe) {
157 throw new RuntimeException(ioe);
158 }
159 }
160 }