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comparison test/compiler/types/TestTypePropagationToCmpU.java @ 23044:68c65ae9f5db

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8080156: Integer.toString(int value) sometimes throws NPE Summary: Added test to check correctness of type propagation to CmpUNodes. Reviewed-by: kvn
author thartmann
date Fri, 22 May 2015 13:02:47 +0200
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23043:03596ae35800 23044:68c65ae9f5db
1 /*
2 * Copyright (c) 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 /*
25 * @test
26 * @bug 8080156 8060036
27 * @summary Test correctness of type propagation to CmpUNodes.
28 * @run main TestTypePropagationToCmpU
29 */
30 public class TestTypePropagationToCmpU {
31 public static void main(String[] args) {
32 try {
33 // Trigger compilation
34 for (int i = 0; i < 100_000; ++i) {
35 test();
36 }
37 } catch (NullPointerException e) {
38 // Test should never throw a NullPointerException
39 throw new RuntimeException("Test failed");
40 }
41 }
42
43 static int global = 42;
44
45 public static void test() {
46 int a = Integer.MIN_VALUE;
47 int b = global;
48 char[] buf = { 0 };
49 for (int i = 0; i <= b; ++i) {
50 a = i - b;
51 }
52 // C2 adds a range check and an uncommon trap here to ensure that the array index
53 // is in bounds. If type information is not propagated correctly to the corresponding
54 // CmpUNode, this trap may be always taken. Because C2 also removes the unnecessary
55 // allocation of 'buf', a NullPointerException is thrown in this case.
56 char c = buf[(a * 11) / 2 - a]; // a is 0 here if global >= 0
57 buf[0] = 0;
58 }
59 }