8149611: Add tests for Unsafe.copySwapMemory
Reviewed-by: dholmes
This commit is contained in:
Mikael Vidstedt
parent
7f395c26ab
commit
243c8598d5
711
jdk/test/jdk/internal/misc/Unsafe/CopySwap.java
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711
jdk/test/jdk/internal/misc/Unsafe/CopySwap.java
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/*
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* Copyright (c) 2016, 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 jdk.internal.misc.Unsafe;
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import java.lang.reflect.Field;
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/*
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* @test
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* @summary Test Unsafe.copySwapMemory
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* @modules java.base/jdk.internal.misc
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*/
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public class CopySwap {
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private static final boolean DEBUG = Boolean.getBoolean("CopySwap.DEBUG");
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public static final long KB = 1024;
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public static final long MB = KB * 1024;
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public static final long GB = MB * 1024;
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private static final Unsafe UNSAFE;
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private static final int SMALL_COPY_SIZE = 32;
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private static final int BASE_ALIGNMENT = 16;
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static {
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try {
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Field f = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe");
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f.setAccessible(true);
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UNSAFE = (jdk.internal.misc.Unsafe) f.get(null);
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} catch (Exception e) {
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throw new RuntimeException("Unable to get Unsafe instance.", e);
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}
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}
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private static long alignDown(long value, long alignment) {
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return value & ~(alignment - 1);
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}
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private static long alignUp(long value, long alignment) {
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return (value + alignment - 1) & ~(alignment - 1);
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}
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private static boolean isAligned(long value, long alignment) {
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return value == alignDown(value, alignment);
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}
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private CopySwap() {
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}
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/**
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* Generate verification data for a given offset
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*
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* The verification data is used to verify that the correct bytes
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* have indeed been copied and byte swapped.
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*
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* The data is generated based on the offset (in bytes) into the
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* source buffer. For a native buffer the offset is relative to
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* the base pointer. For a heap array it is relative to the
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* address of the first array element.
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*
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* This method will return the result of doing an elementSize byte
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* read starting at offset (in bytes).
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*
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* @param offset offset into buffer
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* @param elemSize size (in bytes) of the element
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*
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* @return the verification data, only the least significant
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* elemSize*8 bits are set, zero extended
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*/
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private long getVerificationDataForOffset(long offset, long elemSize) {
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byte[] bytes = new byte[(int)elemSize];
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for (long i = 0; i < elemSize; i++) {
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bytes[(int)i] = (byte)(offset + i);
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}
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long o = UNSAFE.arrayBaseOffset(byte[].class);
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switch ((int)elemSize) {
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case 1: return Byte.toUnsignedLong(UNSAFE.getByte(bytes, o));
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case 2: return Short.toUnsignedLong(UNSAFE.getShortUnaligned(bytes, o));
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case 4: return Integer.toUnsignedLong(UNSAFE.getIntUnaligned(bytes, o));
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case 8: return UNSAFE.getLongUnaligned(bytes, o);
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default: throw new IllegalArgumentException("Invalid element size: " + elemSize);
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}
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}
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/**
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* Verify byte swapped data
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*
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* @param ptr the data to verify
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* @param srcOffset the srcOffset (in bytes) from which the copy started,
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* used as key to regenerate the verification data
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* @param dstOffset the offset (in bytes) in the array at which to start
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* the verification, relative to the first element in the array
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* @param size size (in bytes) of data to to verify
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* @param elemSize size (in bytes) of the individual array elements
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*
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* @throws RuntimeException if an error is found
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*/
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private void verifySwappedData(GenericPointer ptr, long srcOffset, long dstOffset, long size, long elemSize) {
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for (long offset = 0; offset < size; offset += elemSize) {
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long expectedUnswapped = getVerificationDataForOffset(srcOffset + offset, elemSize);
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long expected = byteSwap(expectedUnswapped, elemSize);
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long actual = getArrayElem(ptr, dstOffset + offset, elemSize);
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if (expected != actual) {
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throw new RuntimeException("srcOffset: 0x" + Long.toHexString(srcOffset) +
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" dstOffset: 0x" + Long.toHexString(dstOffset) +
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" size: 0x" + Long.toHexString(size) +
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" offset: 0x" + Long.toHexString(offset) +
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" expectedUnswapped: 0x" + Long.toHexString(expectedUnswapped) +
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" expected: 0x" + Long.toHexString(expected) +
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" != actual: 0x" + Long.toHexString(actual));
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}
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}
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}
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/**
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* Initialize an array with verification friendly data
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*
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* @param ptr pointer to the data to initialize
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* @param size size (in bytes) of the data
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* @param elemSize size (in bytes) of the individual elements
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*/
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private void initVerificationData(GenericPointer ptr, long size, long elemSize) {
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for (long offset = 0; offset < size; offset++) {
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byte data = (byte)getVerificationDataForOffset(offset, 1);
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if (ptr.isOnHeap()) {
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UNSAFE.putByte(ptr.getObject(), ptr.getOffset() + offset, data);
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} else {
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UNSAFE.putByte(ptr.getOffset() + offset, data);
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}
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}
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}
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/**
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* Allocate a primitive array
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*
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* @param size size (in bytes) of all the array elements (elemSize * length)
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* @param elemSize the size of the array elements
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*
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* @return a newly allocated primitive array
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*/
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Object allocArray(long size, long elemSize) {
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int length = (int)(size / elemSize);
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switch ((int)elemSize) {
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case 2: return new short[length];
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case 4: return new int[length];
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case 8: return new long[length];
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default:
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throw new IllegalArgumentException("Invalid element size: " + elemSize);
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}
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}
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/**
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* Get the value of a primitive array entry
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*
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* @param ptr pointer to the data
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* @param offset offset (in bytes) of the array element, relative to the first element in the array
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*
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* @return the array element, as an unsigned long
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*/
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private long getArrayElem(GenericPointer ptr, long offset, long elemSize) {
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if (ptr.isOnHeap()) {
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Object o = ptr.getObject();
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int index = (int)(offset / elemSize);
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if (o instanceof short[]) {
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short[] arr = (short[])o;
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return Short.toUnsignedLong(arr[index]);
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} else if (o instanceof int[]) {
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int[] arr = (int[])o;
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return Integer.toUnsignedLong(arr[index]);
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} else if (o instanceof long[]) {
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long[] arr = (long[])o;
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return arr[index];
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} else {
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throw new IllegalArgumentException("Invalid object type: " + o.getClass().getName());
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}
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} else {
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long addr = ptr.getOffset() + offset;
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switch ((int)elemSize) {
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case 1: return Byte.toUnsignedLong(UNSAFE.getByte(addr));
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case 2: return Short.toUnsignedLong(UNSAFE.getShortUnaligned(null, addr));
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case 4: return Integer.toUnsignedLong(UNSAFE.getIntUnaligned(null, addr));
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case 8: return UNSAFE.getLongUnaligned(null, addr);
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default: throw new IllegalArgumentException("Invalid element size: " + elemSize);
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}
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}
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}
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private void putValue(long addr, long elemSize, long value) {
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switch ((int)elemSize) {
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case 1: UNSAFE.putByte(addr, (byte)value); break;
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case 2: UNSAFE.putShortUnaligned(null, addr, (short)value); break;
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case 4: UNSAFE.putIntUnaligned(null, addr, (int)value); break;
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case 8: UNSAFE.putLongUnaligned(null, addr, value); break;
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default: throw new IllegalArgumentException("Invalid element size: " + elemSize);
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}
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}
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/**
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* Get the size of the elements for an array
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*
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* @param o a primitive heap array
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*
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* @return the size (in bytes) of the individual array elements
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*/
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private long getArrayElemSize(Object o) {
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if (o instanceof short[]) {
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return 2;
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} else if (o instanceof int[]) {
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return 4;
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} else if (o instanceof long[]) {
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return 8;
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} else {
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throw new IllegalArgumentException("Invalid object type: " + o.getClass().getName());
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}
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}
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/**
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* Byte swap a value
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*
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* @param value the value to swap, only the bytes*8 least significant bits are used
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* @param size size (in bytes) of the value
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*
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* @return the byte swapped value in the bytes*8 least significant bits
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*/
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private long byteSwap(long value, long size) {
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switch ((int)size) {
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case 2: return Short.toUnsignedLong(Short.reverseBytes((short)value));
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case 4: return Integer.toUnsignedLong(Integer.reverseBytes((int)value));
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case 8: return Long.reverseBytes(value);
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default: throw new IllegalArgumentException("Invalid element size: " + size);
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}
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}
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/**
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* Verify data in a heap array which has *not* been byte swapped
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*
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* @param ptr the data to verify
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* @param startOffset the offset (in bytes) at which to start the verification
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* @param size size (in bytes) of the data to verify
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*
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* @throws RuntimeException if an error is found
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*/
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private void verifyUnswappedData(GenericPointer ptr, long startOffset, long size) {
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for (long elemOffset = startOffset; elemOffset < startOffset + size; elemOffset++) {
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byte expected = (byte)getVerificationDataForOffset(elemOffset, 1);
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byte actual;
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if (ptr.isOnHeap()) {
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actual = UNSAFE.getByte(ptr.getObject(), ptr.getOffset() + elemOffset);
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} else {
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actual = UNSAFE.getByte(ptr.getOffset() + elemOffset);
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}
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if (expected != actual) {
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throw new RuntimeException("startOffset: 0x" + Long.toHexString(startOffset) +
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" size: 0x" + Long.toHexString(size) +
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" elemOffset: 0x" + Long.toHexString(elemOffset) +
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" expected: 0x" + Long.toHexString(expected) +
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" != actual: 0x" + Long.toHexString(actual));
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}
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}
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}
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/**
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* Copy and byte swap data from the source to the destination
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*
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* This method will pre-populate the whole source and destination
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* buffers with verification friendly data. It will then use
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* copySwapMemory to fill part of the destination buffer with
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* swapped data from the source. Some space (padding) will be
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* left before and after the data in the destination buffer, which
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* should not be touched/overwritten by the copy call.
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*
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* Note: Both source and destination buffers will be overwritten!
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*
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* @param src source buffer to copy from
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* @param srcOffset the offset (in bytes) in the source buffer, relative to
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* the first array element, at which to start reading data
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* @param dst destination buffer to copy to
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* @param dstOffset the offset (in bytes) in the destination
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* buffer, relative to the first array element, at which to
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* start writing data
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* @param bufSize the size (in bytes) of the src and dst arrays
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* @param copyBytes the size (in bytes) of the copy to perform,
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* must be a multiple of elemSize
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* @param elemSize the size (in bytes) of the elements to byte swap
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*
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* @throws RuntimeException if an error is found
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*/
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private void testCopySwap(GenericPointer src, long srcOffset,
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GenericPointer dst, long dstOffset,
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long bufSize, long copyBytes, long elemSize) {
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if (!isAligned(copyBytes, elemSize)) {
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throw new IllegalArgumentException(
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"copyBytes (" + copyBytes + ") must be a multiple of elemSize (" + elemSize + ")");
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}
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if (src.isOnHeap() && !isAligned(srcOffset, elemSize)) {
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throw new IllegalArgumentException(
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"srcOffset (" + srcOffset + ") must be a multiple of elemSize (" + elemSize + ")");
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}
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if (dst.isOnHeap() && !isAligned(dstOffset, elemSize)) {
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throw new IllegalArgumentException(
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"dstOffset (" + dstOffset + ") must be a multiple of elemSize (" + elemSize + ")");
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}
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if (srcOffset + copyBytes > bufSize) {
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throw new IllegalArgumentException(
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"srcOffset (" + srcOffset + ") + copyBytes (" + copyBytes + ") > bufSize (" + bufSize + ")");
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}
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if (dstOffset + copyBytes > bufSize) {
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throw new IllegalArgumentException(
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"dstOffset (" + dstOffset + ") + copyBytes (" + copyBytes + ") > bufSize (" + bufSize + ")");
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}
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// Initialize the whole source buffer with a verification friendly pattern (no 0x00 bytes)
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initVerificationData(src, bufSize, elemSize);
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if (!src.equals(dst)) {
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initVerificationData(dst, bufSize, elemSize);
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}
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if (DEBUG) {
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System.out.println("===before===");
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for (int offset = 0; offset < bufSize; offset += elemSize) {
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long srcValue = getArrayElem(src, offset, elemSize);
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long dstValue = getArrayElem(dst, offset, elemSize);
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System.out.println("offs=0x" + Long.toHexString(Integer.toUnsignedLong(offset)) +
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" src=0x" + Long.toHexString(srcValue) +
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" dst=0x" + Long.toHexString(dstValue));
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}
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}
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// Copy & swap data into the middle of the destination buffer
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UNSAFE.copySwapMemory(src.getObject(),
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src.getOffset() + srcOffset,
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dst.getObject(),
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dst.getOffset() + dstOffset,
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copyBytes,
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elemSize);
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if (DEBUG) {
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System.out.println("===after===");
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for (int offset = 0; offset < bufSize; offset += elemSize) {
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long srcValue = getArrayElem(src, offset, elemSize);
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long dstValue = getArrayElem(dst, offset, elemSize);
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System.out.println("offs=0x" + Long.toHexString(Integer.toUnsignedLong(offset)) +
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" src=0x" + Long.toHexString(srcValue) +
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" dst=0x" + Long.toHexString(dstValue));
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}
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}
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// Verify the the front padding is unchanged
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verifyUnswappedData(dst, 0, dstOffset);
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// Verify swapped data
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verifySwappedData(dst, srcOffset, dstOffset, copyBytes, elemSize);
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// Verify that the back back padding is unchanged
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long frontAndDataBytes = dstOffset + copyBytes;
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long trailingBytes = bufSize - frontAndDataBytes;
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verifyUnswappedData(dst, frontAndDataBytes, trailingBytes);
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}
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/**
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* Test various configurations copy-swapping from one buffer to the other
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*
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* @param src the source buffer to copy from
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* @param dst the destination buffer to copy to
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* @param size size (in bytes) of the buffers
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* @param elemSize size (in bytes) of the individual elements
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*
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* @throws RuntimeException if an error is found
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*/
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public void testBufferPair(GenericPointer src, GenericPointer dst, long size, long elemSize) {
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// offset in source from which to start reading data
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for (long srcOffset = 0; srcOffset < size; srcOffset += (src.isOnHeap() ? elemSize : 1)) {
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// offset in destination at which to start writing data
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for (int dstOffset = 0; dstOffset < size; dstOffset += (dst.isOnHeap() ? elemSize : 1)) {
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// number of bytes to copy
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long maxCopyBytes = Math.min(size - srcOffset, size - dstOffset);
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for (long copyBytes = 0; copyBytes < maxCopyBytes; copyBytes += elemSize) {
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try {
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testCopySwap(src, srcOffset, dst, dstOffset, size, copyBytes, elemSize);
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} catch (RuntimeException e) {
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// Wrap the exception in another exception to catch the relevant configuration data
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throw new RuntimeException("testBufferPair: " +
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"src=" + src +
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" dst=" + dst +
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" elemSize=0x" + Long.toHexString(elemSize) +
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" copyBytes=0x" + Long.toHexString(copyBytes) +
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" srcOffset=0x" + Long.toHexString(srcOffset) +
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" dstOffset=0x" + Long.toHexString(dstOffset),
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e);
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}
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}
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}
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}
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}
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/**
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* Test copying between various permutations of buffers
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*
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* @param buffers buffers to permute (src x dst)
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* @param size size (in bytes) of buffers
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* @param elemSize size (in bytes) of individual elements
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*
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* @throws RuntimeException if an error is found
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*/
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public void testPermuteBuffers(GenericPointer[] buffers, long size, long elemSize) {
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for (int srcIndex = 0; srcIndex < buffers.length; srcIndex++) {
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for (int dstIndex = 0; dstIndex < buffers.length; dstIndex++) {
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testBufferPair(buffers[srcIndex], buffers[dstIndex], size, elemSize);
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}
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}
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}
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/**
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* Test copying of a specific element size
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*
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* @param size size (in bytes) of buffers to allocate
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* @param elemSize size (in bytes) of individual elements
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*
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* @throws RuntimeException if an error is found
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*/
|
||||
private void testElemSize(long size, long elemSize) {
|
||||
long buf1Raw = 0;
|
||||
long buf2Raw = 0;
|
||||
|
||||
try {
|
||||
buf1Raw = UNSAFE.allocateMemory(size + BASE_ALIGNMENT);
|
||||
long buf1 = alignUp(buf1Raw, BASE_ALIGNMENT);
|
||||
|
||||
buf2Raw = UNSAFE.allocateMemory(size + BASE_ALIGNMENT);
|
||||
long buf2 = alignUp(buf2Raw, BASE_ALIGNMENT);
|
||||
|
||||
GenericPointer[] buffers = {
|
||||
new GenericPointer(buf1),
|
||||
new GenericPointer(buf2),
|
||||
new GenericPointer(allocArray(size, elemSize)),
|
||||
new GenericPointer(allocArray(size, elemSize))
|
||||
};
|
||||
|
||||
testPermuteBuffers(buffers, size, elemSize);
|
||||
} finally {
|
||||
if (buf1Raw != 0) {
|
||||
UNSAFE.freeMemory(buf1Raw);
|
||||
}
|
||||
if (buf2Raw != 0) {
|
||||
UNSAFE.freeMemory(buf2Raw);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Verify that small copy swaps work
|
||||
*/
|
||||
private void testSmallCopy() {
|
||||
int smallBufSize = SMALL_COPY_SIZE;
|
||||
|
||||
// Test various element types and heap/native combinations
|
||||
for (long elemSize = 2; elemSize <= 8; elemSize <<= 1) {
|
||||
testElemSize(smallBufSize, elemSize);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Verify that large copy swaps work
|
||||
*/
|
||||
private void testLargeCopy() {
|
||||
long size = 2 * GB + 8;
|
||||
long bufRaw = 0;
|
||||
|
||||
// Check that a large native copy succeeds
|
||||
try {
|
||||
try {
|
||||
bufRaw = UNSAFE.allocateMemory(size + BASE_ALIGNMENT);
|
||||
} catch (OutOfMemoryError e) {
|
||||
// Accept failure, skip test
|
||||
return;
|
||||
}
|
||||
|
||||
long buf = alignUp(bufRaw, BASE_ALIGNMENT);
|
||||
|
||||
UNSAFE.copySwapMemory(null, buf, null, buf, size, 8);
|
||||
} catch (Exception e) {
|
||||
throw new RuntimeException("copySwapMemory of large buffer failed");
|
||||
} finally {
|
||||
if (bufRaw != 0) {
|
||||
UNSAFE.freeMemory(bufRaw);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Run positive tests
|
||||
*
|
||||
* @throws RuntimeException if an error is found
|
||||
*/
|
||||
private void testPositive() {
|
||||
testSmallCopy();
|
||||
testLargeCopy();
|
||||
}
|
||||
|
||||
/**
|
||||
* Run negative tests, testing corner cases and the various exceptions
|
||||
*
|
||||
* @throws RuntimeException if an error is found
|
||||
*/
|
||||
private void testNegative() {
|
||||
long bufRaw = 0;
|
||||
|
||||
try {
|
||||
bufRaw = UNSAFE.allocateMemory(1024);
|
||||
long buf = alignUp(bufRaw, BASE_ALIGNMENT);
|
||||
short[] arr = new short[16];
|
||||
|
||||
// Check various illegal element sizes
|
||||
for (int elemSize = 2; elemSize <= 8; elemSize <<= 1) {
|
||||
long[] illegalSizes = { -1, 1, elemSize - 1, elemSize + 1, elemSize * 2 - 1 };
|
||||
for (long size : illegalSizes) {
|
||||
try {
|
||||
// Check that illegal elemSize throws an IAE
|
||||
UNSAFE.copySwapMemory(null, buf, null, buf, size, elemSize);
|
||||
throw new RuntimeException("copySwapMemory failed to throw IAE for size=" + size + " elemSize=" + elemSize);
|
||||
} catch (IllegalArgumentException e) {
|
||||
// good
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
try {
|
||||
// Check that negative srcOffset throws an IAE
|
||||
UNSAFE.copySwapMemory(arr, -1, arr, UNSAFE.arrayBaseOffset(arr.getClass()), 16, 2);
|
||||
throw new RuntimeException("copySwapMemory failed to throw IAE for srcOffset=-1");
|
||||
} catch (IllegalArgumentException e) {
|
||||
// good
|
||||
}
|
||||
|
||||
try {
|
||||
// Check that negative dstOffset throws an IAE
|
||||
UNSAFE.copySwapMemory(arr, UNSAFE.arrayBaseOffset(arr.getClass()), arr, -1, 16, 2);
|
||||
throw new RuntimeException("copySwapMemory failed to throw IAE for destOffset=-1");
|
||||
} catch (IllegalArgumentException e) {
|
||||
// good
|
||||
}
|
||||
|
||||
long illegalElemSizes[] = { 0, 1, 3, 5, 6, 7, 9, 10, -1 };
|
||||
for (long elemSize : illegalElemSizes) {
|
||||
try {
|
||||
// Check that elemSize 1 throws an IAE
|
||||
UNSAFE.copySwapMemory(null, buf, null, buf, 16, elemSize);
|
||||
throw new RuntimeException("copySwapMemory failed to throw NPE");
|
||||
} catch (IllegalArgumentException e) {
|
||||
// good
|
||||
}
|
||||
}
|
||||
|
||||
try {
|
||||
// Check that a NULL source throws NPE
|
||||
UNSAFE.copySwapMemory(null, 0, null, buf, 16, 2);
|
||||
throw new RuntimeException("copySwapMemory failed to throw NPE");
|
||||
} catch (NullPointerException e) {
|
||||
// good
|
||||
}
|
||||
|
||||
try {
|
||||
// Check that a NULL destination throws NPE
|
||||
UNSAFE.copySwapMemory(null, buf, null, 0, 16, 2);
|
||||
throw new RuntimeException("copySwapMemory failed to throw NPE");
|
||||
} catch (NullPointerException e) {
|
||||
// good
|
||||
}
|
||||
|
||||
try {
|
||||
// Check that a reference array destination throws IAE
|
||||
UNSAFE.copySwapMemory(null, buf, new Object[16], UNSAFE.arrayBaseOffset(Object[].class), 16, 8);
|
||||
throw new RuntimeException("copySwapMemory failed to throw NPE");
|
||||
} catch (IllegalArgumentException e) {
|
||||
// good
|
||||
}
|
||||
|
||||
// Check that invalid source & dest pointers throw IAEs (only relevant on 32-bit platforms)
|
||||
if (UNSAFE.addressSize() == 4) {
|
||||
long invalidPtr = (long)1 << 35; // Pick a random bit in upper 32 bits
|
||||
|
||||
try {
|
||||
// Check that an invalid (not 32-bit clean) source pointer throws IAE
|
||||
UNSAFE.copySwapMemory(null, invalidPtr, null, buf, 16, 2);
|
||||
throw new RuntimeException("copySwapMemory failed to throw IAE for srcOffset 0x" +
|
||||
Long.toHexString(invalidPtr));
|
||||
} catch (IllegalArgumentException e) {
|
||||
// good
|
||||
}
|
||||
|
||||
try {
|
||||
// Check that an invalid (not 32-bit clean) source pointer throws IAE
|
||||
UNSAFE.copySwapMemory(null, buf, null, invalidPtr, 16, 2);
|
||||
throw new RuntimeException("copySwapMemory failed to throw IAE for destOffset 0x" +
|
||||
Long.toHexString(invalidPtr));
|
||||
} catch (IllegalArgumentException e) {
|
||||
// good
|
||||
}
|
||||
}
|
||||
} finally {
|
||||
if (bufRaw != 0) {
|
||||
UNSAFE.freeMemory(bufRaw);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Run all tests
|
||||
*
|
||||
* @throws RuntimeException if an error is found
|
||||
*/
|
||||
private void test() {
|
||||
testPositive();
|
||||
testNegative();
|
||||
}
|
||||
|
||||
public static void main(String[] args) {
|
||||
CopySwap cs = new CopySwap();
|
||||
cs.test();
|
||||
}
|
||||
|
||||
/**
|
||||
* Helper class to represent a "pointer" - either a heap array or
|
||||
* a pointer to a native buffer.
|
||||
*
|
||||
* In the case of a native pointer, the Object is null and the offset is
|
||||
* the absolute address of the native buffer.
|
||||
*
|
||||
* In the case of a heap object, the Object is a primitive array, and
|
||||
* the offset will be set to the base offset to the first element, meaning
|
||||
* the object and the offset together form a double-register pointer.
|
||||
*/
|
||||
static class GenericPointer {
|
||||
private final Object o;
|
||||
private final long offset;
|
||||
|
||||
private GenericPointer(Object o, long offset) {
|
||||
this.o = o;
|
||||
this.offset = offset;
|
||||
}
|
||||
|
||||
public String toString() {
|
||||
return "GenericPointer(o={" + o + "}, offset=0x" + Long.toHexString(offset) + ")";
|
||||
}
|
||||
|
||||
public boolean equals(Object other) {
|
||||
if (!(other instanceof GenericPointer)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
GenericPointer otherp = (GenericPointer)other;
|
||||
|
||||
return o == otherp.o && offset == otherp.offset;
|
||||
}
|
||||
|
||||
GenericPointer(Object o) {
|
||||
this(o, UNSAFE.arrayBaseOffset(o.getClass()));
|
||||
}
|
||||
|
||||
GenericPointer(long offset) {
|
||||
this(null, offset);
|
||||
}
|
||||
|
||||
public boolean isOnHeap() {
|
||||
return o != null;
|
||||
}
|
||||
|
||||
public Object getObject() {
|
||||
return o;
|
||||
}
|
||||
|
||||
public long getOffset() {
|
||||
return offset;
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user