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/*
* Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
import java.nio.charset.StandardCharsets;
/*
* @test
* @bug 8077559 8321180
* @summary Tests Compact String for maximum size strings
* @requires os.maxMemory >= 8g & vm.bits == 64
* @requires vm.flagless
* @run junit/othervm -XX:+CompactStrings -Xmx8g MaxSizeUTF16String
* @run junit/othervm -XX:-CompactStrings -Xmx8g MaxSizeUTF16String
* @run junit/othervm -Xcomp -Xmx8g MaxSizeUTF16String
*/
public class MaxSizeUTF16String {
private final static int MAX_UTF16_STRING_LENGTH = Integer.MAX_VALUE / 2;
private final static String EXPECTED_OOME_MESSAGE = "UTF16 String size is";
private final static String EXPECTED_VM_LIMIT_MESSAGE = "Requested array size exceeds VM limit";
private final static String UNEXPECTED_JAVA_HEAP_SPACE = "Java heap space";
// Create a large UTF-8 byte array with a single non-latin1 character
private static byte[] generateUTF8Data(int byteSize) {
byte[] nonAscii = "\u0100".getBytes(StandardCharsets.UTF_8);
byte[] arr = new byte[byteSize];
System.arraycopy(nonAscii, 0, arr, 0, nonAscii.length); // non-latin1 at start
return arr;
}
// Create a large char array with a single non-latin1 character
private static char[] generateCharData(int size) {
char[] nonAscii = "\u0100".toCharArray();
char[] arr = new char[size];
System.arraycopy(nonAscii, 0, arr, 0, nonAscii.length); // non-latin1 at start
return arr;
}
@Test
public void testMaxUTF8() {
// Overly large UTF-8 data with 1 non-latin1 char
final byte[] large_utf8_bytes = generateUTF8Data(MAX_UTF16_STRING_LENGTH + 1);
int[] sizes = new int[] {
MAX_UTF16_STRING_LENGTH + 1,
MAX_UTF16_STRING_LENGTH,
MAX_UTF16_STRING_LENGTH - 1};
for (int size : sizes) {
System.err.println("Checking max UTF16 string len: " + size);
try {
// Use only part of the UTF-8 byte array
new String(large_utf8_bytes, 0, size, StandardCharsets.UTF_8);
if (size >= MAX_UTF16_STRING_LENGTH) {
fail("Expected OutOfMemoryError with message prefix: " + EXPECTED_OOME_MESSAGE);
}
} catch (OutOfMemoryError ex) {
if (ex.getMessage().equals(UNEXPECTED_JAVA_HEAP_SPACE)) {
// Insufficient heap size
throw ex;
}
if (!ex.getMessage().startsWith(EXPECTED_OOME_MESSAGE) &&
!ex.getMessage().startsWith(EXPECTED_VM_LIMIT_MESSAGE)) {
fail("Failed: Not the OutOfMemoryError expected", ex);
}
}
}
}
@Test
public void testMaxCharArray() {
// Overly large UTF-8 data with 1 non-latin1 char
final char[] large_char_array = generateCharData(MAX_UTF16_STRING_LENGTH + 1);
int[] sizes = new int[]{
MAX_UTF16_STRING_LENGTH + 1,
MAX_UTF16_STRING_LENGTH,
MAX_UTF16_STRING_LENGTH - 1};
for (int size : sizes) {
System.err.println("Checking max UTF16 string len: " + size);
try {
// Large char array with 1 non-latin1 char
new String(large_char_array, 0, size);
if (size >= MAX_UTF16_STRING_LENGTH) {
fail("Expected OutOfMemoryError with message prefix: " + EXPECTED_OOME_MESSAGE);
}
} catch (OutOfMemoryError ex) {
if (ex.getMessage().equals(UNEXPECTED_JAVA_HEAP_SPACE)) {
// Insufficient heap size
throw ex;
}
if (!ex.getMessage().startsWith(EXPECTED_OOME_MESSAGE) &&
!ex.getMessage().startsWith(EXPECTED_VM_LIMIT_MESSAGE)) {
throw new RuntimeException("Wrong exception message: " + ex.getMessage(), ex);
}
}
}
}
}
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