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annotate test/compiler/types/TestTypePropagationToCmpU.java @ 24110:a8378ff1936d

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remove use of cache in jdk.vm.ci.services.Services (GR-3293)
author Doug Simon <doug.simon@oracle.com>
date Mon, 20 Mar 2017 10:46:02 +0100
parents 68c65ae9f5db
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
68c65ae9f5db 8080156: Integer.toString(int value) sometimes throws NPE
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
68c65ae9f5db 8080156: Integer.toString(int value) sometimes throws NPE
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /*
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25 * @test
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26 * @bug 8080156 8060036
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27 * @summary Test correctness of type propagation to CmpUNodes.
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28 * @run main TestTypePropagationToCmpU
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29 */
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30 public class TestTypePropagationToCmpU {
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31 public static void main(String[] args) {
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32 try {
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33 // Trigger compilation
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34 for (int i = 0; i < 100_000; ++i) {
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35 test();
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36 }
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37 } catch (NullPointerException e) {
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38 // Test should never throw a NullPointerException
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39 throw new RuntimeException("Test failed");
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40 }
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41 }
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42
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43 static int global = 42;
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44
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45 public static void test() {
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46 int a = Integer.MIN_VALUE;
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47 int b = global;
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48 char[] buf = { 0 };
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49 for (int i = 0; i <= b; ++i) {
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50 a = i - b;
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51 }
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52 // C2 adds a range check and an uncommon trap here to ensure that the array index
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53 // is in bounds. If type information is not propagated correctly to the corresponding
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54 // CmpUNode, this trap may be always taken. Because C2 also removes the unnecessary
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55 // allocation of 'buf', a NullPointerException is thrown in this case.
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56 char c = buf[(a * 11) / 2 - a]; // a is 0 here if global >= 0
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57 buf[0] = 0;
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58 }
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59 }