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d037d62968
Co-authored-by: Christian Hagedorn <chagedorn@openjdk.org> Co-authored-by: Roman Kennke <rkennke@openjdk.org> Reviewed-by: shade, vlivanov, rkennke
105 lines
4.1 KiB
Java
105 lines
4.1 KiB
Java
/*
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* Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8380060
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* @summary C2 block arraycopy initial-word pick-off folds load to zero
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*
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* @run main/othervm -Xbatch -XX:+UseCompactObjectHeaders
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* -XX:CompileCommand=compileonly,compiler.arraycopy.TestBlockArrayCopyMisaligned::test*
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* compiler.arraycopy.TestBlockArrayCopyMisaligned
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* @run main/othervm -Xbatch -XX:-UseCompactObjectHeaders
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* -XX:CompileCommand=compileonly,compiler.arraycopy.TestBlockArrayCopyMisaligned::test*
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* compiler.arraycopy.TestBlockArrayCopyMisaligned
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*/
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package compiler.arraycopy;
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import java.util.Arrays;
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public class TestBlockArrayCopyMisaligned {
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// Byte array with enough data to exercise the block arraycopy path.
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// The clone + substring pattern triggers a tightly-coupled allocation
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// where the source is initialized via a raw arraycopy (clone) and the
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// destination is a nozero allocation filled by a block arraycopy.
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static final byte[] BYTES = new byte[] {
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108, 77, 120, 120, 100, 77, 105, 113,
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83, 97, 71, 108, 116, 107, 90, 71,
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72, 107, 73, 85, 54, 65, 61, 61
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};
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// Test via String(byte[],hibyte,off,count) + substring.
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// The deprecated String constructor clones the byte array via
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// Arrays.copyOfRange; substring then does another copyOfRange
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// on the clone, triggering the block arraycopy optimization.
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static String testStringSubstring() {
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String s = new String(BYTES, 0, 0, 24);
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return s.substring(0, 23);
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}
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// Test via explicit clone + Arrays.copyOfRange.
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static byte[] testCloneCopyOfRange() {
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byte[] clone = BYTES.clone();
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return Arrays.copyOfRange(clone, 0, 23);
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}
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// Test via explicit clone + Arrays.copyOf.
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static byte[] testCloneCopyOf() {
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byte[] clone = BYTES.clone();
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return Arrays.copyOf(clone, 20);
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}
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public static void main(String[] args) {
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String golden = new String(BYTES, 0, 0, 23);
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for (int i = 0; i < 10_000; i++) {
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// Test 1: String path
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String result1 = testStringSubstring();
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if (!result1.equals(golden)) {
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throw new RuntimeException("testStringSubstring: expected "
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+ golden + ", got " + result1);
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}
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// Test 2: clone + copyOfRange
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byte[] result2 = testCloneCopyOfRange();
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for (int j = 0; j < 23; j++) {
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if (result2[j] != BYTES[j]) {
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throw new RuntimeException("testCloneCopyOfRange: mismatch at index " + j
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+ ", expected " + BYTES[j] + ", got " + result2[j]);
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}
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}
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// Test 3: clone + copyOf
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byte[] result3 = testCloneCopyOf();
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for (int j = 0; j < 20; j++) {
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if (result3[j] != BYTES[j]) {
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throw new RuntimeException("testCloneCopyOf: mismatch at index " + j
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+ ", expected " + BYTES[j] + ", got " + result3[j]);
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}
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}
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}
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}
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}
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