russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
722 lines
26 KiB
Java
722 lines
26 KiB
Java
/*
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* Copyright (c) 2017, 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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import java.io.IOException;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodType;
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import java.nio.Buffer;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.nio.CharBuffer;
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import java.nio.DoubleBuffer;
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import java.nio.FloatBuffer;
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import java.nio.IntBuffer;
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import java.nio.LongBuffer;
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import java.nio.MappedByteBuffer;
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import java.nio.ShortBuffer;
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import java.nio.channels.FileChannel;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Set;
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import java.util.function.BiFunction;
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import java.util.function.LongFunction;
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import java.util.stream.IntStream;
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import java.util.stream.Stream;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.Arguments;
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import org.junit.jupiter.params.provider.MethodSource;
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import static java.nio.charset.StandardCharsets.UTF_8;
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import static java.nio.file.StandardOpenOption.*;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertFalse;
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import static org.junit.jupiter.api.Assertions.assertNotEquals;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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/*
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* @test
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* @bug 8193085 8199773
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* @summary tests for buffer equals and compare
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* @run junit EqualsCompareTest
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*/
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public class EqualsCompareTest {
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// Maximum width in bits
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static final int MAX_WIDTH = 512;
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static final Map<Class, Integer> typeToWidth;
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static {
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typeToWidth = new HashMap<>();
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typeToWidth.put(byte.class, Byte.SIZE);
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typeToWidth.put(short.class, Short.SIZE);
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typeToWidth.put(char.class, Character.SIZE);
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typeToWidth.put(int.class, Integer.SIZE);
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typeToWidth.put(long.class, Long.SIZE);
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typeToWidth.put(float.class, Float.SIZE);
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typeToWidth.put(double.class, Double.SIZE);
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}
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static int arraySizeFor(Class<?> type) {
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assert type.isPrimitive();
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return 4 * MAX_WIDTH / typeToWidth.get(type);
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}
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enum BufferKind {
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HEAP,
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HEAP_VIEW,
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DIRECT;
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}
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static abstract class BufferType<T extends Buffer, E> {
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final BufferKind k;
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final Class<?> bufferType;
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final Class<?> elementType;
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final MethodHandle eq;
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final MethodHandle cmp;
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final MethodHandle mismtch;
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final MethodHandle getter;
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final MethodHandle setter;
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BufferType(BufferKind k, Class<T> bufferType, Class<?> elementType) {
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this.k = k;
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this.bufferType = bufferType;
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this.elementType = elementType;
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var lookup = MethodHandles.lookup();
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try {
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eq = lookup.findVirtual(bufferType, "equals", MethodType.methodType(boolean.class, Object.class));
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cmp = lookup.findVirtual(bufferType, "compareTo", MethodType.methodType(int.class, bufferType));
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mismtch = lookup.findVirtual(bufferType, "mismatch", MethodType.methodType(int.class, bufferType));
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getter = lookup.findVirtual(bufferType, "get", MethodType.methodType(elementType, int.class));
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setter = lookup.findVirtual(bufferType, "put", MethodType.methodType(bufferType, int.class, elementType));
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}
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catch (Exception e) {
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throw new AssertionError(e);
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}
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}
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@Override
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public String toString() {
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return bufferType.getName() + " " + k;
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}
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T construct(int length) {
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return construct(length, ByteOrder.BIG_ENDIAN);
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}
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abstract T construct(int length, ByteOrder bo);
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@SuppressWarnings("unchecked")
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T slice(T a, int from, int to, boolean dupOtherwiseSlice) {
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a = (T) a.position(from).limit(to);
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return (T) (dupOtherwiseSlice ? a.duplicate() : a.slice());
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}
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@SuppressWarnings("unchecked")
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E get(T a, int i) {
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try {
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return (E) getter.invoke(a, i);
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}
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catch (RuntimeException | Error e) {
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throw e;
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}
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catch (Throwable t) {
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throw new Error(t);
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}
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}
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void set(T a, int i, Object v) {
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try {
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setter.invoke(a, i, convert(v));
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}
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catch (RuntimeException | Error e) {
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throw e;
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}
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catch (Throwable t) {
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throw new Error(t);
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}
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}
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abstract Object convert(Object o);
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boolean equals(T a, T b) {
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try {
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return (boolean) eq.invoke(a, b);
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}
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catch (RuntimeException | Error e) {
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throw e;
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}
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catch (Throwable t) {
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throw new Error(t);
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}
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}
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int compare(T a, T b) {
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try {
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return (int) cmp.invoke(a, b);
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}
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catch (RuntimeException | Error e) {
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throw e;
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}
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catch (Throwable t) {
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throw new Error(t);
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}
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}
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boolean pairWiseEquals(T a, T b) {
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if (a.remaining() != b.remaining())
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return false;
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int p = a.position();
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for (int i = a.limit() - 1, j = b.limit() - 1; i >= p; i--, j--)
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if (!get(a, i).equals(get(b, j)))
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return false;
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return true;
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}
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int mismatch(T a, T b) {
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try {
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return (int) mismtch.invoke(a, b);
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}
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catch (RuntimeException | Error e) {
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throw e;
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}
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catch (Throwable t) {
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throw new Error(t);
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}
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}
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static class Bytes extends BufferType<ByteBuffer, Byte> {
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Bytes(BufferKind k) {
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super(k, ByteBuffer.class, byte.class);
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}
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@Override
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ByteBuffer construct(int length, ByteOrder bo) {
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switch (k) {
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case DIRECT:
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return ByteBuffer.allocateDirect(length).order(bo);
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default:
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case HEAP_VIEW:
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case HEAP:
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return ByteBuffer.allocate(length).order(bo);
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}
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}
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@Override
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Object convert(Object o) {
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return o instanceof Integer
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? ((Integer) o).byteValue()
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: o;
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}
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}
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static class Chars extends BufferType<CharBuffer, Character> {
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Chars(BufferKind k) {
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super(k, CharBuffer.class, char.class);
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}
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@Override
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CharBuffer construct(int length, ByteOrder bo) {
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switch (k) {
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case DIRECT:
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return ByteBuffer.allocateDirect(length * Character.BYTES).
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order(bo).
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asCharBuffer();
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case HEAP_VIEW:
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return ByteBuffer.allocate(length * Character.BYTES).
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order(bo).
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asCharBuffer();
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default:
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case HEAP:
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return CharBuffer.allocate(length);
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}
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}
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@Override
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Object convert(Object o) {
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return o instanceof Integer
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? (char) ((Integer) o).intValue()
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: o;
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}
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CharBuffer transformToStringBuffer(CharBuffer c) {
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char[] chars = new char[c.remaining()];
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c.get(chars);
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return CharBuffer.wrap(new String(chars));
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}
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}
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static class Shorts extends BufferType<ShortBuffer, Short> {
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Shorts(BufferKind k) {
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super(k, ShortBuffer.class, short.class);
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}
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@Override
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ShortBuffer construct(int length, ByteOrder bo) {
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switch (k) {
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case DIRECT:
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return ByteBuffer.allocateDirect(length * Short.BYTES).
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order(bo).
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asShortBuffer();
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case HEAP_VIEW:
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return ByteBuffer.allocate(length * Short.BYTES).
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order(bo).
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asShortBuffer();
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default:
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case HEAP:
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return ShortBuffer.allocate(length);
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}
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}
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@Override
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Object convert(Object o) {
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return o instanceof Integer
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? ((Integer) o).shortValue()
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: o;
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}
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}
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static class Ints extends BufferType<IntBuffer, Integer> {
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Ints(BufferKind k) {
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super(k, IntBuffer.class, int.class);
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}
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@Override
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IntBuffer construct(int length, ByteOrder bo) {
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switch (k) {
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case DIRECT:
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return ByteBuffer.allocateDirect(length * Integer.BYTES).
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order(bo).
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asIntBuffer();
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case HEAP_VIEW:
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return ByteBuffer.allocate(length * Integer.BYTES).
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order(bo).
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asIntBuffer();
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default:
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case HEAP:
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return IntBuffer.allocate(length);
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}
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}
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Object convert(Object o) {
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return o;
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}
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}
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static class Floats extends BufferType<FloatBuffer, Float> {
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Floats(BufferKind k) {
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super(k, FloatBuffer.class, float.class);
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}
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@Override
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FloatBuffer construct(int length, ByteOrder bo) {
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switch (k) {
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case DIRECT:
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return ByteBuffer.allocateDirect(length * Float.BYTES).
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order(bo).
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asFloatBuffer();
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case HEAP_VIEW:
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return ByteBuffer.allocate(length * Float.BYTES).
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order(bo).
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asFloatBuffer();
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default:
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case HEAP:
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return FloatBuffer.allocate(length);
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}
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}
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@Override
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Object convert(Object o) {
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return o instanceof Integer
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? ((Integer) o).floatValue()
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: o;
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}
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@Override
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boolean pairWiseEquals(FloatBuffer a, FloatBuffer b) {
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if (a.remaining() != b.remaining())
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return false;
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int p = a.position();
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for (int i = a.limit() - 1, j = b.limit() - 1; i >= p; i--, j--) {
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float av = a.get(i);
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float bv = b.get(j);
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if (av != bv && (!Float.isNaN(av) || !Float.isNaN(bv)))
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return false;
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}
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return true;
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}
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}
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static class Longs extends BufferType<LongBuffer, Long> {
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Longs(BufferKind k) {
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super(k, LongBuffer.class, long.class);
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}
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@Override
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LongBuffer construct(int length, ByteOrder bo) {
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switch (k) {
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case DIRECT:
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return ByteBuffer.allocateDirect(length * Long.BYTES).
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order(bo).
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asLongBuffer();
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case HEAP_VIEW:
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return ByteBuffer.allocate(length * Long.BYTES).
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order(bo).
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asLongBuffer();
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default:
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case HEAP:
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return LongBuffer.allocate(length);
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}
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}
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@Override
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Object convert(Object o) {
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return o instanceof Integer
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? ((Integer) o).longValue()
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: o;
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}
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}
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static class Doubles extends BufferType<DoubleBuffer, Double> {
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Doubles(BufferKind k) {
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super(k, DoubleBuffer.class, double.class);
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}
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@Override
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DoubleBuffer construct(int length, ByteOrder bo) {
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switch (k) {
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case DIRECT:
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return ByteBuffer.allocateDirect(length * Double.BYTES).
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order(bo).
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asDoubleBuffer();
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case HEAP_VIEW:
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return ByteBuffer.allocate(length * Double.BYTES).
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order(bo).
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asDoubleBuffer();
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default:
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case HEAP:
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return DoubleBuffer.allocate(length);
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}
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}
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@Override
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Object convert(Object o) {
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return o instanceof Integer
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? ((Integer) o).doubleValue()
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: o;
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}
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@Override
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boolean pairWiseEquals(DoubleBuffer a, DoubleBuffer b) {
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if (a.remaining() != b.remaining())
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return false;
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int p = a.position();
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for (int i = a.limit() - 1, j = b.limit() - 1; i >= p; i--, j--) {
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double av = a.get(i);
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double bv = b.get(j);
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if (av != bv && (!Double.isNaN(av) || !Double.isNaN(bv)))
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return false;
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}
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return true;
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}
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}
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}
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public static Stream<BufferType> bufferTypesSource() {
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return Stream.of
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(new BufferType.Bytes(BufferKind.HEAP),
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new BufferType.Bytes(BufferKind.DIRECT),
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new BufferType.Chars(BufferKind.HEAP),
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new BufferType.Chars(BufferKind.HEAP_VIEW),
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new BufferType.Chars(BufferKind.DIRECT),
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new BufferType.Shorts(BufferKind.HEAP),
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new BufferType.Shorts(BufferKind.HEAP_VIEW),
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new BufferType.Shorts(BufferKind.DIRECT),
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new BufferType.Ints(BufferKind.HEAP),
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new BufferType.Ints(BufferKind.HEAP_VIEW),
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new BufferType.Ints(BufferKind.DIRECT),
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new BufferType.Floats(BufferKind.HEAP),
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new BufferType.Floats(BufferKind.HEAP_VIEW),
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new BufferType.Floats(BufferKind.DIRECT),
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new BufferType.Longs(BufferKind.HEAP),
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new BufferType.Longs(BufferKind.HEAP_VIEW),
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new BufferType.Longs(BufferKind.DIRECT),
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new BufferType.Doubles(BufferKind.HEAP),
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new BufferType.Doubles(BufferKind.HEAP_VIEW),
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new BufferType.Doubles(BufferKind.DIRECT));
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}
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public static Stream<Arguments> floatBufferTypesSource() {
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LongFunction<Object> bTof = rb -> Float.intBitsToFloat((int) rb);
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LongFunction<Object> bToD = Double::longBitsToDouble;
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return Stream.of
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(// canonical and non-canonical NaNs
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// If conversion is a signalling NaN it may be subject to conversion to a
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// quiet NaN on some processors, even if a copy is performed
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// The tests assume that if conversion occurs it does not convert to the
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// canonical NaN
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Arguments.of(new BufferType.Floats(BufferKind.HEAP), 0x7fc00000L, 0x7f800001L, bTof),
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Arguments.of(new BufferType.Floats(BufferKind.HEAP_VIEW), 0x7fc00000L, 0x7f800001L, bTof),
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Arguments.of(new BufferType.Floats(BufferKind.DIRECT), 0x7fc00000L, 0x7f800001L, bTof),
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Arguments.of(new BufferType.Doubles(BufferKind.HEAP), 0x7ff8000000000000L, 0x7ff0000000000001L, bToD),
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Arguments.of(new BufferType.Doubles(BufferKind.HEAP_VIEW), 0x7ff8000000000000L, 0x7ff0000000000001L, bToD),
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Arguments.of(new BufferType.Doubles(BufferKind.DIRECT), 0x7ff8000000000000L, 0x7ff0000000000001L, bToD),
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// +0.0 and -0.0
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Arguments.of(new BufferType.Floats(BufferKind.HEAP), 0x0L, 0x80000000L, bTof),
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Arguments.of(new BufferType.Floats(BufferKind.HEAP_VIEW), 0x0L, 0x80000000L, bTof),
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Arguments.of(new BufferType.Floats(BufferKind.DIRECT), 0x0L, 0x80000000L, bTof),
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Arguments.of(new BufferType.Doubles(BufferKind.HEAP), 0x0L, 0x8000000000000000L, bToD),
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Arguments.of(new BufferType.Doubles(BufferKind.HEAP_VIEW), 0x0L, 0x8000000000000000L, bToD),
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Arguments.of(new BufferType.Doubles(BufferKind.DIRECT), 0x0L, 0x8000000000000000L, bToD));
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}
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public static Stream<Arguments> charBufferTypesSource() {
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return Stream.of
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(Arguments.of(new BufferType.Chars(BufferKind.HEAP)),
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Arguments.of(new BufferType.Chars(BufferKind.HEAP_VIEW)),
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Arguments.of(new BufferType.Chars(BufferKind.DIRECT)));
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}
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// Tests all primitive buffers
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@ParameterizedTest
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@MethodSource("bufferTypesSource")
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<E>
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void testBuffers(BufferType<Buffer, E> bufferType) {
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// Test with buffers of the same byte order (BE)
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BiFunction<BufferType<Buffer, E>, Integer, Buffer> constructor = (at, s) -> {
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Buffer a = at.construct(s);
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for (int x = 0; x < s; x++) {
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at.set(a, x, x % 8);
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}
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return a;
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};
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testBufferType(bufferType, constructor, constructor);
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// Test with buffers of different byte order
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if (bufferType.elementType != byte.class &&
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(bufferType.k == BufferKind.HEAP_VIEW ||
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bufferType.k == BufferKind.DIRECT)) {
|
|
|
|
BiFunction<BufferType<Buffer, E>, Integer, Buffer> leConstructor = (at, s) -> {
|
|
Buffer a = at.construct(s, ByteOrder.LITTLE_ENDIAN);
|
|
for (int x = 0; x < s; x++) {
|
|
at.set(a, x, x % 8);
|
|
}
|
|
return a;
|
|
};
|
|
testBufferType(bufferType, constructor, leConstructor);
|
|
}
|
|
}
|
|
|
|
// Tests float and double buffers with edge-case values (NaN, -0.0, +0.0)
|
|
@ParameterizedTest
|
|
@MethodSource("floatBufferTypesSource")
|
|
public void testFloatBuffers(
|
|
BufferType<Buffer, Float> bufferType,
|
|
long rawBitsA, long rawBitsB,
|
|
LongFunction<Object> bitsToFloat) {
|
|
Object av = bitsToFloat.apply(rawBitsA);
|
|
Object bv = bitsToFloat.apply(rawBitsB);
|
|
|
|
BiFunction<BufferType<Buffer, Float>, Integer, Buffer> allAs = (at, s) -> {
|
|
Buffer b = at.construct(s);
|
|
for (int x = 0; x < s; x++) {
|
|
at.set(b, x, av);
|
|
}
|
|
return b;
|
|
};
|
|
|
|
BiFunction<BufferType<Buffer, Float>, Integer, Buffer> allBs = (at, s) -> {
|
|
Buffer b = at.construct(s);
|
|
for (int x = 0; x < s; x++) {
|
|
at.set(b, x, bv);
|
|
}
|
|
return b;
|
|
};
|
|
|
|
BiFunction<BufferType<Buffer, Float>, Integer, Buffer> halfBs = (at, s) -> {
|
|
Buffer b = at.construct(s);
|
|
for (int x = 0; x < s / 2; x++) {
|
|
at.set(b, x, bv);
|
|
}
|
|
for (int x = s / 2; x < s; x++) {
|
|
at.set(b, x, 1);
|
|
}
|
|
return b;
|
|
};
|
|
|
|
// Sanity check
|
|
int size = arraySizeFor(bufferType.elementType);
|
|
assertTrue(bufferType.pairWiseEquals(allAs.apply(bufferType, size),
|
|
allBs.apply(bufferType, size)));
|
|
assertTrue(bufferType.equals(allAs.apply(bufferType, size),
|
|
allBs.apply(bufferType, size)));
|
|
|
|
testBufferType(bufferType, allAs, allBs);
|
|
testBufferType(bufferType, allAs, halfBs);
|
|
}
|
|
|
|
// Tests CharBuffer for region sources and CharSequence sources
|
|
@ParameterizedTest
|
|
@MethodSource("charBufferTypesSource")
|
|
public void testCharBuffers(BufferType.Chars charBufferType) {
|
|
|
|
BiFunction<BufferType.Chars, Integer, CharBuffer> constructor = (at, s) -> {
|
|
CharBuffer a = at.construct(s);
|
|
for (int x = 0; x < s; x++) {
|
|
at.set(a, x, x % 8);
|
|
}
|
|
return a;
|
|
};
|
|
|
|
BiFunction<BufferType.Chars, Integer, CharBuffer> constructorX = constructor.
|
|
andThen(charBufferType::transformToStringBuffer);
|
|
|
|
testBufferType(charBufferType, constructor, constructorX);
|
|
}
|
|
|
|
<B extends Buffer, E, BT extends BufferType<B, E>>
|
|
void testBufferType(BT bt,
|
|
BiFunction<BT, Integer, B> aConstructor,
|
|
BiFunction<BT, Integer, B> bConstructor) {
|
|
int n = arraySizeFor(bt.elementType);
|
|
|
|
for (boolean dupOtherwiseSlice : new boolean[]{ false, true }) {
|
|
for (int s : ranges(0, n)) {
|
|
B a = aConstructor.apply(bt, s);
|
|
B b = bConstructor.apply(bt, s);
|
|
|
|
for (int aFrom : ranges(0, s)) {
|
|
for (int aTo : ranges(aFrom, s)) {
|
|
int aLength = aTo - aFrom;
|
|
|
|
B as = aLength != s
|
|
? bt.slice(a, aFrom, aTo, dupOtherwiseSlice)
|
|
: a;
|
|
|
|
for (int bFrom : ranges(0, s)) {
|
|
for (int bTo : ranges(bFrom, s)) {
|
|
int bLength = bTo - bFrom;
|
|
|
|
B bs = bLength != s
|
|
? bt.slice(b, bFrom, bTo, dupOtherwiseSlice)
|
|
: b;
|
|
|
|
boolean eq = bt.pairWiseEquals(as, bs);
|
|
assertEquals(eq, bt.equals(as, bs));
|
|
assertEquals(eq, bt.equals(bs, as));
|
|
if (eq) {
|
|
assertEquals(0, bt.compare(as, bs));
|
|
assertEquals(0, bt.compare(bs, as));
|
|
|
|
// If buffers are equal, there shall be no mismatch
|
|
assertEquals(-1, bt.mismatch(as, bs));
|
|
assertEquals(-1, bt.mismatch(bs, as));
|
|
}
|
|
else {
|
|
int aCb = bt.compare(as, bs);
|
|
int bCa = bt.compare(bs, as);
|
|
int v = Integer.signum(aCb) * Integer.signum(bCa);
|
|
assertEquals(-1, v);
|
|
|
|
int aMs = bt.mismatch(as, bs);
|
|
int bMs = bt.mismatch(bs, as);
|
|
assertNotEquals(-1, aMs);
|
|
assertEquals(bMs, aMs);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (aLength > 0 && !a.isReadOnly()) {
|
|
for (int i = aFrom; i < aTo; i++) {
|
|
B c = aConstructor.apply(bt, a.capacity());
|
|
B cs = aLength != s
|
|
? bt.slice(c, aFrom, aTo, dupOtherwiseSlice)
|
|
: c;
|
|
|
|
// Create common prefix with a length of i - aFrom
|
|
bt.set(c, i, -1);
|
|
|
|
assertFalse(bt.equals(c, a));
|
|
|
|
int cCa = bt.compare(cs, as);
|
|
int aCc = bt.compare(as, cs);
|
|
int v = Integer.signum(cCa) * Integer.signum(aCc);
|
|
assertEquals(-1, v);
|
|
|
|
int cMa = bt.mismatch(cs, as);
|
|
int aMc = bt.mismatch(as, cs);
|
|
assertEquals(aMc, cMa);
|
|
assertEquals(i - aFrom, cMa);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int[] ranges(int from, int to) {
|
|
int width = to - from;
|
|
switch (width) {
|
|
case 0:
|
|
return new int[]{};
|
|
case 1:
|
|
return new int[]{from, to};
|
|
case 2:
|
|
return new int[]{from, from + 1, to};
|
|
case 3:
|
|
return new int[]{from, from + 1, from + 2, to};
|
|
default:
|
|
return IntStream.of(from, from + 1, from + 2, to / 2 - 1, to / 2, to / 2 + 1, to - 2, to - 1, to)
|
|
.filter(i -> i >= from && i <= to)
|
|
.distinct().toArray();
|
|
}
|
|
}
|
|
|
|
@Test
|
|
void testHashCode() throws IOException {
|
|
byte[] bytes = "hello world".getBytes(UTF_8);
|
|
Path path = Files.createTempFile("", "");
|
|
Files.write(path, bytes);
|
|
try (FileChannel fc = FileChannel.open(path, READ, DELETE_ON_CLOSE)) {
|
|
MappedByteBuffer one = fc.map(FileChannel.MapMode.READ_ONLY, 0, bytes.length);
|
|
ByteBuffer two = ByteBuffer.wrap(bytes);
|
|
assertEquals(two, one);
|
|
assertEquals(two.hashCode(), one.hashCode());
|
|
}
|
|
}
|
|
}
|