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/*
* Copyright (c) 2016, 2025, 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 jdk.internal.util.ArraysSupport;
import java.util.Arrays;
/**
* @test
* @bug 8149330 8218227 8351443
* @summary Capacity should not get close to Integer.MAX_VALUE unless
* necessary
* @modules java.base/jdk.internal.util
* @requires (sun.arch.data.model == "64" & os.maxMemory >= 8G)
* @run main/othervm -Xms8G -Xmx8G -XX:-CompactStrings -Xlog:gc HugeCapacity false
* @run main/othervm -Xms8G -Xmx8G -XX:+CompactStrings -Xlog:gc HugeCapacity true
*/
public class HugeCapacity {
private static int failures = 0;
public static void main(String[] args) {
if (args.length == 0) {
throw new IllegalArgumentException("Need the argument");
}
boolean isCompact = Boolean.parseBoolean(args[0]);
testLatin1(isCompact);
testUtf16();
testHugeInitialString();
testHugeInitialCharSequence();
testHugePlus(isCompact);
if (failures > 0) {
throw new RuntimeException(failures + " tests failed");
}
}
private static void testLatin1(boolean isCompact) {
try {
int divisor = isCompact ? 2 : 4;
StringBuilder sb = new StringBuilder();
sb.ensureCapacity(Integer.MAX_VALUE / divisor);
sb.ensureCapacity(Integer.MAX_VALUE / divisor + 1);
} catch (OutOfMemoryError oom) {
oom.printStackTrace();
failures++;
}
}
private static void testUtf16() {
try {
StringBuilder sb = new StringBuilder();
sb.append('\u042b');
sb.ensureCapacity(Integer.MAX_VALUE / 4);
sb.ensureCapacity(Integer.MAX_VALUE / 4 + 1);
} catch (OutOfMemoryError oom) {
oom.printStackTrace();
failures++;
}
}
private static void testHugeInitialString() {
try {
String str = "Z".repeat(ArraysSupport.SOFT_MAX_ARRAY_LENGTH);
StringBuilder sb = new StringBuilder(str);
} catch (OutOfMemoryError ignore) {
} catch (Throwable unexpected) {
unexpected.printStackTrace();
failures++;
}
}
private static void testHugeInitialCharSequence() {
try {
CharSequence seq = new MyHugeCharSeq();
StringBuilder sb = new StringBuilder(seq);
} catch (OutOfMemoryError ignore) {
} catch (Throwable unexpected) {
unexpected.printStackTrace();
failures++;
}
}
private static class MyHugeCharSeq implements CharSequence {
public char charAt(int i) {
throw new UnsupportedOperationException();
}
public int length() { return Integer.MAX_VALUE; }
public CharSequence subSequence(int st, int e) {
throw new UnsupportedOperationException();
}
public String toString() { return ""; }
}
// Test creating and appending the max size string for -XX:+CompactStrings and -XX:-CompactStrings
private static void testHugePlus(boolean isCompact) {
int repeatCount = (isCompact) ? Integer.MAX_VALUE / 2 - 1 : Integer.MAX_VALUE / 4 - 1;
char[] chars = new char[repeatCount];
char[] aChar = {'A', '\uff21'};
for (char ch : aChar) {
try {
int size = (ch > 0xff) ? repeatCount / 2 : repeatCount;
Arrays.fill(chars, 0, size, ch);
StringBuilder b = new StringBuilder(0);
b.append(chars, 0, size);
b.append(chars, 0, size);
} catch (Throwable unexpected) {
unexpected.printStackTrace();
failures++;
}
}
}
}
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