1037 lines
33 KiB
Java
1037 lines
33 KiB
Java
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// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package com.google.protobuf;
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import java.lang.reflect.Field;
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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.security.AccessController;
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import java.security.PrivilegedExceptionAction;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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/** Utility class for working with unsafe operations. */
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final class UnsafeUtil {
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private static final sun.misc.Unsafe UNSAFE = getUnsafe();
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private static final Class<?> MEMORY_CLASS = Android.getMemoryClass();
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private static final boolean IS_ANDROID_64 = determineAndroidSupportByAddressSize(long.class);
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private static final boolean IS_ANDROID_32 = determineAndroidSupportByAddressSize(int.class);
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private static final MemoryAccessor MEMORY_ACCESSOR = getMemoryAccessor();
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private static final boolean HAS_UNSAFE_BYTEBUFFER_OPERATIONS =
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supportsUnsafeByteBufferOperations();
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private static final boolean HAS_UNSAFE_ARRAY_OPERATIONS = supportsUnsafeArrayOperations();
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static final long BYTE_ARRAY_BASE_OFFSET = arrayBaseOffset(byte[].class);
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// Micro-optimization: we can assume a scale of 1 and skip the multiply
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// private static final long BYTE_ARRAY_INDEX_SCALE = 1;
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private static final long BOOLEAN_ARRAY_BASE_OFFSET = arrayBaseOffset(boolean[].class);
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private static final long BOOLEAN_ARRAY_INDEX_SCALE = arrayIndexScale(boolean[].class);
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private static final long INT_ARRAY_BASE_OFFSET = arrayBaseOffset(int[].class);
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private static final long INT_ARRAY_INDEX_SCALE = arrayIndexScale(int[].class);
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private static final long LONG_ARRAY_BASE_OFFSET = arrayBaseOffset(long[].class);
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private static final long LONG_ARRAY_INDEX_SCALE = arrayIndexScale(long[].class);
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private static final long FLOAT_ARRAY_BASE_OFFSET = arrayBaseOffset(float[].class);
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private static final long FLOAT_ARRAY_INDEX_SCALE = arrayIndexScale(float[].class);
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private static final long DOUBLE_ARRAY_BASE_OFFSET = arrayBaseOffset(double[].class);
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private static final long DOUBLE_ARRAY_INDEX_SCALE = arrayIndexScale(double[].class);
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private static final long OBJECT_ARRAY_BASE_OFFSET = arrayBaseOffset(Object[].class);
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private static final long OBJECT_ARRAY_INDEX_SCALE = arrayIndexScale(Object[].class);
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private static final long BUFFER_ADDRESS_OFFSET = fieldOffset(bufferAddressField());
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private static final int STRIDE = 8;
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private static final int STRIDE_ALIGNMENT_MASK = STRIDE - 1;
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private static final int BYTE_ARRAY_ALIGNMENT =
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(int) (BYTE_ARRAY_BASE_OFFSET & STRIDE_ALIGNMENT_MASK);
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static final boolean IS_BIG_ENDIAN = ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN;
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private UnsafeUtil() {}
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static boolean hasUnsafeArrayOperations() {
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return HAS_UNSAFE_ARRAY_OPERATIONS;
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}
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static boolean hasUnsafeByteBufferOperations() {
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return HAS_UNSAFE_BYTEBUFFER_OPERATIONS;
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}
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static boolean isAndroid64() {
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return IS_ANDROID_64;
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}
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@SuppressWarnings("unchecked") // safe by method contract
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static <T> T allocateInstance(Class<T> clazz) {
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try {
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return (T) UNSAFE.allocateInstance(clazz);
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} catch (InstantiationException e) {
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throw new IllegalStateException(e);
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}
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}
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static long objectFieldOffset(Field field) {
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return MEMORY_ACCESSOR.objectFieldOffset(field);
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}
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private static int arrayBaseOffset(Class<?> clazz) {
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return HAS_UNSAFE_ARRAY_OPERATIONS ? MEMORY_ACCESSOR.arrayBaseOffset(clazz) : -1;
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}
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private static int arrayIndexScale(Class<?> clazz) {
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return HAS_UNSAFE_ARRAY_OPERATIONS ? MEMORY_ACCESSOR.arrayIndexScale(clazz) : -1;
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}
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static byte getByte(Object target, long offset) {
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return MEMORY_ACCESSOR.getByte(target, offset);
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}
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static void putByte(Object target, long offset, byte value) {
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MEMORY_ACCESSOR.putByte(target, offset, value);
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}
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static int getInt(Object target, long offset) {
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return MEMORY_ACCESSOR.getInt(target, offset);
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}
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static void putInt(Object target, long offset, int value) {
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MEMORY_ACCESSOR.putInt(target, offset, value);
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}
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static long getLong(Object target, long offset) {
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return MEMORY_ACCESSOR.getLong(target, offset);
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}
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static void putLong(Object target, long offset, long value) {
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MEMORY_ACCESSOR.putLong(target, offset, value);
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}
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static boolean getBoolean(Object target, long offset) {
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return MEMORY_ACCESSOR.getBoolean(target, offset);
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}
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static void putBoolean(Object target, long offset, boolean value) {
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MEMORY_ACCESSOR.putBoolean(target, offset, value);
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}
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static float getFloat(Object target, long offset) {
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return MEMORY_ACCESSOR.getFloat(target, offset);
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}
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static void putFloat(Object target, long offset, float value) {
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MEMORY_ACCESSOR.putFloat(target, offset, value);
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}
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static double getDouble(Object target, long offset) {
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return MEMORY_ACCESSOR.getDouble(target, offset);
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}
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static void putDouble(Object target, long offset, double value) {
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MEMORY_ACCESSOR.putDouble(target, offset, value);
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}
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static Object getObject(Object target, long offset) {
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return MEMORY_ACCESSOR.getObject(target, offset);
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}
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static void putObject(Object target, long offset, Object value) {
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MEMORY_ACCESSOR.putObject(target, offset, value);
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}
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static byte getByte(byte[] target, long index) {
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return MEMORY_ACCESSOR.getByte(target, BYTE_ARRAY_BASE_OFFSET + index);
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}
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static void putByte(byte[] target, long index, byte value) {
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MEMORY_ACCESSOR.putByte(target, BYTE_ARRAY_BASE_OFFSET + index, value);
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}
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static int getInt(int[] target, long index) {
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return MEMORY_ACCESSOR.getInt(target, INT_ARRAY_BASE_OFFSET + (index * INT_ARRAY_INDEX_SCALE));
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}
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static void putInt(int[] target, long index, int value) {
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MEMORY_ACCESSOR.putInt(target, INT_ARRAY_BASE_OFFSET + (index * INT_ARRAY_INDEX_SCALE), value);
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}
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static long getLong(long[] target, long index) {
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return MEMORY_ACCESSOR.getLong(
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target, LONG_ARRAY_BASE_OFFSET + (index * LONG_ARRAY_INDEX_SCALE));
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}
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static void putLong(long[] target, long index, long value) {
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MEMORY_ACCESSOR.putLong(
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target, LONG_ARRAY_BASE_OFFSET + (index * LONG_ARRAY_INDEX_SCALE), value);
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}
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static boolean getBoolean(boolean[] target, long index) {
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return MEMORY_ACCESSOR.getBoolean(
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target, BOOLEAN_ARRAY_BASE_OFFSET + (index * BOOLEAN_ARRAY_INDEX_SCALE));
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}
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static void putBoolean(boolean[] target, long index, boolean value) {
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MEMORY_ACCESSOR.putBoolean(
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target, BOOLEAN_ARRAY_BASE_OFFSET + (index * BOOLEAN_ARRAY_INDEX_SCALE), value);
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}
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static float getFloat(float[] target, long index) {
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return MEMORY_ACCESSOR.getFloat(
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target, FLOAT_ARRAY_BASE_OFFSET + (index * FLOAT_ARRAY_INDEX_SCALE));
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}
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static void putFloat(float[] target, long index, float value) {
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MEMORY_ACCESSOR.putFloat(
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target, FLOAT_ARRAY_BASE_OFFSET + (index * FLOAT_ARRAY_INDEX_SCALE), value);
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}
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static double getDouble(double[] target, long index) {
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return MEMORY_ACCESSOR.getDouble(
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target, DOUBLE_ARRAY_BASE_OFFSET + (index * DOUBLE_ARRAY_INDEX_SCALE));
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}
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static void putDouble(double[] target, long index, double value) {
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MEMORY_ACCESSOR.putDouble(
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target, DOUBLE_ARRAY_BASE_OFFSET + (index * DOUBLE_ARRAY_INDEX_SCALE), value);
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}
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static Object getObject(Object[] target, long index) {
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return MEMORY_ACCESSOR.getObject(
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target, OBJECT_ARRAY_BASE_OFFSET + (index * OBJECT_ARRAY_INDEX_SCALE));
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}
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static void putObject(Object[] target, long index, Object value) {
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MEMORY_ACCESSOR.putObject(
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target, OBJECT_ARRAY_BASE_OFFSET + (index * OBJECT_ARRAY_INDEX_SCALE), value);
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}
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static void copyMemory(byte[] src, long srcIndex, long targetOffset, long length) {
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MEMORY_ACCESSOR.copyMemory(src, srcIndex, targetOffset, length);
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}
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static void copyMemory(long srcOffset, byte[] target, long targetIndex, long length) {
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MEMORY_ACCESSOR.copyMemory(srcOffset, target, targetIndex, length);
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}
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static void copyMemory(byte[] src, long srcIndex, byte[] target, long targetIndex, long length) {
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System.arraycopy(src, (int) srcIndex, target, (int) targetIndex, (int) length);
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}
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static byte getByte(long address) {
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return MEMORY_ACCESSOR.getByte(address);
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}
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static void putByte(long address, byte value) {
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MEMORY_ACCESSOR.putByte(address, value);
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}
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static int getInt(long address) {
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return MEMORY_ACCESSOR.getInt(address);
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}
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static void putInt(long address, int value) {
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MEMORY_ACCESSOR.putInt(address, value);
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}
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static long getLong(long address) {
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return MEMORY_ACCESSOR.getLong(address);
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}
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static void putLong(long address, long value) {
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MEMORY_ACCESSOR.putLong(address, value);
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}
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/** Gets the offset of the {@code address} field of the given direct {@link ByteBuffer}. */
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static long addressOffset(ByteBuffer buffer) {
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return MEMORY_ACCESSOR.getLong(buffer, BUFFER_ADDRESS_OFFSET);
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}
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static Object getStaticObject(Field field) {
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return MEMORY_ACCESSOR.getStaticObject(field);
|
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}
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|
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/**
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* Gets the {@code sun.misc.Unsafe} instance, or {@code null} if not available on this platform.
|
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*/
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static sun.misc.Unsafe getUnsafe() {
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sun.misc.Unsafe unsafe = null;
|
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|
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try {
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unsafe =
|
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|
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AccessController.doPrivileged(
|
||
|
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new PrivilegedExceptionAction<sun.misc.Unsafe>() {
|
||
|
|
@Override
|
||
|
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public sun.misc.Unsafe run() throws Exception {
|
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Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
|
||
|
|
|
||
|
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for (Field f : k.getDeclaredFields()) {
|
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f.setAccessible(true);
|
||
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Object x = f.get(null);
|
||
|
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if (k.isInstance(x)) {
|
||
|
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return k.cast(x);
|
||
|
|
}
|
||
|
|
}
|
||
|
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// The sun.misc.Unsafe field does not exist.
|
||
|
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return null;
|
||
|
|
}
|
||
|
|
});
|
||
|
|
} catch (Throwable e) {
|
||
|
|
// Catching Throwable here due to the fact that Google AppEngine raises NoClassDefFoundError
|
||
|
|
// for Unsafe.
|
||
|
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}
|
||
|
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return unsafe;
|
||
|
|
}
|
||
|
|
|
||
|
|
/** Get a {@link MemoryAccessor} appropriate for the platform, or null if not supported. */
|
||
|
|
private static MemoryAccessor getMemoryAccessor() {
|
||
|
|
if (UNSAFE == null) {
|
||
|
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return null;
|
||
|
|
}
|
||
|
|
if (Android.isOnAndroidDevice()) {
|
||
|
|
if (IS_ANDROID_64) {
|
||
|
|
return new Android64MemoryAccessor(UNSAFE);
|
||
|
|
} else if (IS_ANDROID_32) {
|
||
|
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return new Android32MemoryAccessor(UNSAFE);
|
||
|
|
} else {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return new JvmMemoryAccessor(UNSAFE);
|
||
|
|
}
|
||
|
|
|
||
|
|
private static boolean supportsUnsafeArrayOperations() {
|
||
|
|
if (MEMORY_ACCESSOR == null) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
return MEMORY_ACCESSOR.supportsUnsafeArrayOperations();
|
||
|
|
}
|
||
|
|
|
||
|
|
private static boolean supportsUnsafeByteBufferOperations() {
|
||
|
|
if (MEMORY_ACCESSOR == null) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
return MEMORY_ACCESSOR.supportsUnsafeByteBufferOperations();
|
||
|
|
}
|
||
|
|
|
||
|
|
static boolean determineAndroidSupportByAddressSize(Class<?> addressClass) {
|
||
|
|
if (!Android.isOnAndroidDevice()) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
try {
|
||
|
|
Class<?> clazz = MEMORY_CLASS;
|
||
|
|
clazz.getMethod("peekLong", addressClass, boolean.class);
|
||
|
|
clazz.getMethod("pokeLong", addressClass, long.class, boolean.class);
|
||
|
|
clazz.getMethod("pokeInt", addressClass, int.class, boolean.class);
|
||
|
|
clazz.getMethod("peekInt", addressClass, boolean.class);
|
||
|
|
clazz.getMethod("pokeByte", addressClass, byte.class);
|
||
|
|
clazz.getMethod("peekByte", addressClass);
|
||
|
|
clazz.getMethod("pokeByteArray", addressClass, byte[].class, int.class, int.class);
|
||
|
|
clazz.getMethod("peekByteArray", addressClass, byte[].class, int.class, int.class);
|
||
|
|
return true;
|
||
|
|
} catch (Throwable t) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/** Finds the address field within a direct {@link Buffer}. */
|
||
|
|
private static Field bufferAddressField() {
|
||
|
|
if (Android.isOnAndroidDevice()) {
|
||
|
|
// Old versions of Android had renamed the address field to 'effectiveDirectAddress', but
|
||
|
|
// recent versions of Android (>M?) use the OpenJDK implementation. Fall through in that case.
|
||
|
|
Field field = field(Buffer.class, "effectiveDirectAddress");
|
||
|
|
if (field != null) {
|
||
|
|
return field;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
Field field = field(Buffer.class, "address");
|
||
|
|
return field != null && field.getType() == long.class ? field : null;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the index of the first byte where left and right differ, in the range [0, 8]. If {@code
|
||
|
|
* left == right}, the result will be 8, otherwise less than 8.
|
||
|
|
*
|
||
|
|
* <p>This counts from the *first* byte, which may be the most or least significant byte depending
|
||
|
|
* on the system endianness.
|
||
|
|
*/
|
||
|
|
private static int firstDifferingByteIndexNativeEndian(long left, long right) {
|
||
|
|
int n =
|
||
|
|
IS_BIG_ENDIAN
|
||
|
|
? Long.numberOfLeadingZeros(left ^ right)
|
||
|
|
: Long.numberOfTrailingZeros(left ^ right);
|
||
|
|
return n >> 3;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the lowest {@code index} such that {@code 0 <= index < length} and {@code left[leftOff
|
||
|
|
* + index] != right[rightOff + index]}. If no such value exists -- if {@code left} and {@code
|
||
|
|
* right} match up to {@code length} bytes from their respective offsets -- returns -1.
|
||
|
|
*
|
||
|
|
* <p>{@code leftOff + length} must be less than or equal to {@code left.length}, and the same for
|
||
|
|
* {@code right}.
|
||
|
|
*/
|
||
|
|
static int mismatch(byte[] left, int leftOff, byte[] right, int rightOff, int length) {
|
||
|
|
if (leftOff < 0
|
||
|
|
|| rightOff < 0
|
||
|
|
|| length < 0
|
||
|
|
|| leftOff + length > left.length
|
||
|
|
|| rightOff + length > right.length) {
|
||
|
|
throw new IndexOutOfBoundsException();
|
||
|
|
}
|
||
|
|
|
||
|
|
int index = 0;
|
||
|
|
if (HAS_UNSAFE_ARRAY_OPERATIONS) {
|
||
|
|
int leftAlignment = (BYTE_ARRAY_ALIGNMENT + leftOff) & STRIDE_ALIGNMENT_MASK;
|
||
|
|
|
||
|
|
// Most CPUs handle getting chunks of bytes better on addresses that are a multiple of 4
|
||
|
|
// or 8.
|
||
|
|
// We walk one byte at a time until the left address, at least, is a multiple of 8.
|
||
|
|
// If the right address is, too, so much the better.
|
||
|
|
for (;
|
||
|
|
index < length && (leftAlignment & STRIDE_ALIGNMENT_MASK) != 0;
|
||
|
|
index++, leftAlignment++) {
|
||
|
|
if (left[leftOff + index] != right[rightOff + index]) {
|
||
|
|
return index;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Stride! Grab eight bytes at a time from left and right and check them for equality.
|
||
|
|
|
||
|
|
int strideLength = ((length - index) & ~STRIDE_ALIGNMENT_MASK) + index;
|
||
|
|
// strideLength is the point where we want to stop striding: it differs from index by
|
||
|
|
// a multiple of STRIDE, and it's the largest such number <= length.
|
||
|
|
|
||
|
|
for (; index < strideLength; index += STRIDE) {
|
||
|
|
long leftLongWord = getLong(left, BYTE_ARRAY_BASE_OFFSET + leftOff + index);
|
||
|
|
long rightLongWord = getLong(right, BYTE_ARRAY_BASE_OFFSET + rightOff + index);
|
||
|
|
if (leftLongWord != rightLongWord) {
|
||
|
|
// one of these eight bytes differ! use a helper to find out which one
|
||
|
|
return index + firstDifferingByteIndexNativeEndian(leftLongWord, rightLongWord);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// If we were able to stride, there are at most STRIDE - 1 bytes left to compare.
|
||
|
|
// If we weren't, then this loop covers the whole thing.
|
||
|
|
for (; index < length; index++) {
|
||
|
|
if (left[leftOff + index] != right[rightOff + index]) {
|
||
|
|
return index;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the offset of the provided field, or {@code -1} if {@code sun.misc.Unsafe} is not
|
||
|
|
* available.
|
||
|
|
*/
|
||
|
|
private static long fieldOffset(Field field) {
|
||
|
|
return field == null || MEMORY_ACCESSOR == null ? -1 : MEMORY_ACCESSOR.objectFieldOffset(field);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Gets the field with the given name within the class, or {@code null} if not found.
|
||
|
|
*/
|
||
|
|
private static Field field(Class<?> clazz, String fieldName) {
|
||
|
|
Field field;
|
||
|
|
try {
|
||
|
|
field = clazz.getDeclaredField(fieldName);
|
||
|
|
} catch (Throwable t) {
|
||
|
|
// Failed to access the fields.
|
||
|
|
field = null;
|
||
|
|
}
|
||
|
|
return field;
|
||
|
|
}
|
||
|
|
|
||
|
|
private abstract static class MemoryAccessor {
|
||
|
|
|
||
|
|
sun.misc.Unsafe unsafe;
|
||
|
|
|
||
|
|
MemoryAccessor(sun.misc.Unsafe unsafe) {
|
||
|
|
this.unsafe = unsafe;
|
||
|
|
}
|
||
|
|
|
||
|
|
public final long objectFieldOffset(Field field) {
|
||
|
|
return unsafe.objectFieldOffset(field);
|
||
|
|
}
|
||
|
|
|
||
|
|
public final int arrayBaseOffset(Class<?> clazz) {
|
||
|
|
return unsafe.arrayBaseOffset(clazz);
|
||
|
|
}
|
||
|
|
|
||
|
|
public final int arrayIndexScale(Class<?> clazz) {
|
||
|
|
return unsafe.arrayIndexScale(clazz);
|
||
|
|
}
|
||
|
|
|
||
|
|
public abstract Object getStaticObject(Field field);
|
||
|
|
|
||
|
|
// Relative Address Operations ---------------------------------------------
|
||
|
|
|
||
|
|
// Indicates whether the following relative address operations are supported
|
||
|
|
// by this memory accessor.
|
||
|
|
public boolean supportsUnsafeArrayOperations() {
|
||
|
|
if (unsafe == null) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
try {
|
||
|
|
Class<?> clazz = unsafe.getClass();
|
||
|
|
clazz.getMethod("objectFieldOffset", Field.class);
|
||
|
|
clazz.getMethod("arrayBaseOffset", Class.class);
|
||
|
|
clazz.getMethod("arrayIndexScale", Class.class);
|
||
|
|
clazz.getMethod("getInt", Object.class, long.class);
|
||
|
|
clazz.getMethod("putInt", Object.class, long.class, int.class);
|
||
|
|
clazz.getMethod("getLong", Object.class, long.class);
|
||
|
|
clazz.getMethod("putLong", Object.class, long.class, long.class);
|
||
|
|
clazz.getMethod("getObject", Object.class, long.class);
|
||
|
|
clazz.getMethod("putObject", Object.class, long.class, Object.class);
|
||
|
|
|
||
|
|
return true;
|
||
|
|
} catch (Throwable e) {
|
||
|
|
logMissingMethod(e);
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
public abstract byte getByte(Object target, long offset);
|
||
|
|
|
||
|
|
public abstract void putByte(Object target, long offset, byte value);
|
||
|
|
|
||
|
|
public final int getInt(Object target, long offset) {
|
||
|
|
return unsafe.getInt(target, offset);
|
||
|
|
}
|
||
|
|
|
||
|
|
public final void putInt(Object target, long offset, int value) {
|
||
|
|
unsafe.putInt(target, offset, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
public final long getLong(Object target, long offset) {
|
||
|
|
return unsafe.getLong(target, offset);
|
||
|
|
}
|
||
|
|
|
||
|
|
public final void putLong(Object target, long offset, long value) {
|
||
|
|
unsafe.putLong(target, offset, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
public abstract boolean getBoolean(Object target, long offset);
|
||
|
|
|
||
|
|
public abstract void putBoolean(Object target, long offset, boolean value);
|
||
|
|
|
||
|
|
public abstract float getFloat(Object target, long offset);
|
||
|
|
|
||
|
|
public abstract void putFloat(Object target, long offset, float value);
|
||
|
|
|
||
|
|
public abstract double getDouble(Object target, long offset);
|
||
|
|
|
||
|
|
public abstract void putDouble(Object target, long offset, double value);
|
||
|
|
|
||
|
|
public final Object getObject(Object target, long offset) {
|
||
|
|
return unsafe.getObject(target, offset);
|
||
|
|
}
|
||
|
|
|
||
|
|
public final void putObject(Object target, long offset, Object value) {
|
||
|
|
unsafe.putObject(target, offset, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Absolute Address Operations --------------------------------------------
|
||
|
|
|
||
|
|
// Indicates whether the following absolute address operations are
|
||
|
|
// supported by this memory accessor.
|
||
|
|
public boolean supportsUnsafeByteBufferOperations() {
|
||
|
|
if (unsafe == null) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
try {
|
||
|
|
Class<?> clazz = unsafe.getClass();
|
||
|
|
// Methods for getting direct buffer address.
|
||
|
|
clazz.getMethod("objectFieldOffset", Field.class);
|
||
|
|
clazz.getMethod("getLong", Object.class, long.class);
|
||
|
|
|
||
|
|
if (bufferAddressField() == null) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
return true;
|
||
|
|
} catch (Throwable e) {
|
||
|
|
logMissingMethod(e);
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
public abstract byte getByte(long address);
|
||
|
|
|
||
|
|
public abstract void putByte(long address, byte value);
|
||
|
|
|
||
|
|
public abstract int getInt(long address);
|
||
|
|
|
||
|
|
public abstract void putInt(long address, int value);
|
||
|
|
|
||
|
|
public abstract long getLong(long address);
|
||
|
|
|
||
|
|
public abstract void putLong(long address, long value);
|
||
|
|
|
||
|
|
public abstract void copyMemory(long srcOffset, byte[] target, long targetIndex, long length);
|
||
|
|
|
||
|
|
public abstract void copyMemory(byte[] src, long srcIndex, long targetOffset, long length);
|
||
|
|
}
|
||
|
|
|
||
|
|
private static final class JvmMemoryAccessor extends MemoryAccessor {
|
||
|
|
|
||
|
|
JvmMemoryAccessor(sun.misc.Unsafe unsafe) {
|
||
|
|
super(unsafe);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public Object getStaticObject(Field field) {
|
||
|
|
return getObject(unsafe.staticFieldBase(field), unsafe.staticFieldOffset(field));
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public boolean supportsUnsafeArrayOperations() {
|
||
|
|
if (!super.supportsUnsafeArrayOperations()) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
try {
|
||
|
|
Class<?> clazz = unsafe.getClass();
|
||
|
|
clazz.getMethod("getByte", Object.class, long.class);
|
||
|
|
clazz.getMethod("putByte", Object.class, long.class, byte.class);
|
||
|
|
clazz.getMethod("getBoolean", Object.class, long.class);
|
||
|
|
clazz.getMethod("putBoolean", Object.class, long.class, boolean.class);
|
||
|
|
clazz.getMethod("getFloat", Object.class, long.class);
|
||
|
|
clazz.getMethod("putFloat", Object.class, long.class, float.class);
|
||
|
|
clazz.getMethod("getDouble", Object.class, long.class);
|
||
|
|
clazz.getMethod("putDouble", Object.class, long.class, double.class);
|
||
|
|
|
||
|
|
return true;
|
||
|
|
} catch (Throwable e) {
|
||
|
|
logMissingMethod(e);
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public byte getByte(Object target, long offset) {
|
||
|
|
return unsafe.getByte(target, offset);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putByte(Object target, long offset, byte value) {
|
||
|
|
unsafe.putByte(target, offset, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public boolean getBoolean(Object target, long offset) {
|
||
|
|
return unsafe.getBoolean(target, offset);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putBoolean(Object target, long offset, boolean value) {
|
||
|
|
unsafe.putBoolean(target, offset, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public float getFloat(Object target, long offset) {
|
||
|
|
return unsafe.getFloat(target, offset);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putFloat(Object target, long offset, float value) {
|
||
|
|
unsafe.putFloat(target, offset, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public double getDouble(Object target, long offset) {
|
||
|
|
return unsafe.getDouble(target, offset);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putDouble(Object target, long offset, double value) {
|
||
|
|
unsafe.putDouble(target, offset, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public boolean supportsUnsafeByteBufferOperations() {
|
||
|
|
if (!super.supportsUnsafeByteBufferOperations()) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
try {
|
||
|
|
Class<?> clazz = unsafe.getClass();
|
||
|
|
clazz.getMethod("getByte", long.class);
|
||
|
|
clazz.getMethod("putByte", long.class, byte.class);
|
||
|
|
clazz.getMethod("getInt", long.class);
|
||
|
|
clazz.getMethod("putInt", long.class, int.class);
|
||
|
|
clazz.getMethod("getLong", long.class);
|
||
|
|
clazz.getMethod("putLong", long.class, long.class);
|
||
|
|
clazz.getMethod("copyMemory", long.class, long.class, long.class);
|
||
|
|
clazz.getMethod(
|
||
|
|
"copyMemory", Object.class, long.class, Object.class, long.class, long.class);
|
||
|
|
return true;
|
||
|
|
} catch (Throwable e) {
|
||
|
|
logMissingMethod(e);
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public byte getByte(long address) {
|
||
|
|
return unsafe.getByte(address);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putByte(long address, byte value) {
|
||
|
|
unsafe.putByte(address, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public int getInt(long address) {
|
||
|
|
return unsafe.getInt(address);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putInt(long address, int value) {
|
||
|
|
unsafe.putInt(address, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public long getLong(long address) {
|
||
|
|
return unsafe.getLong(address);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putLong(long address, long value) {
|
||
|
|
unsafe.putLong(address, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void copyMemory(long srcOffset, byte[] target, long targetIndex, long length) {
|
||
|
|
unsafe.copyMemory(null, srcOffset, target, BYTE_ARRAY_BASE_OFFSET + targetIndex, length);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void copyMemory(byte[] src, long srcIndex, long targetOffset, long length) {
|
||
|
|
unsafe.copyMemory(src, BYTE_ARRAY_BASE_OFFSET + srcIndex, null, targetOffset, length);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private static final class Android64MemoryAccessor extends MemoryAccessor {
|
||
|
|
|
||
|
|
Android64MemoryAccessor(sun.misc.Unsafe unsafe) {
|
||
|
|
super(unsafe);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public Object getStaticObject(Field field) {
|
||
|
|
try {
|
||
|
|
return field.get(null);
|
||
|
|
} catch (IllegalAccessException e) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public byte getByte(Object target, long offset) {
|
||
|
|
if (IS_BIG_ENDIAN) {
|
||
|
|
return getByteBigEndian(target, offset);
|
||
|
|
} else {
|
||
|
|
return getByteLittleEndian(target, offset);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putByte(Object target, long offset, byte value) {
|
||
|
|
if (IS_BIG_ENDIAN) {
|
||
|
|
putByteBigEndian(target, offset, value);
|
||
|
|
} else {
|
||
|
|
putByteLittleEndian(target, offset, value);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public boolean getBoolean(Object target, long offset) {
|
||
|
|
if (IS_BIG_ENDIAN) {
|
||
|
|
return getBooleanBigEndian(target, offset);
|
||
|
|
} else {
|
||
|
|
return getBooleanLittleEndian(target, offset);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putBoolean(Object target, long offset, boolean value) {
|
||
|
|
if (IS_BIG_ENDIAN) {
|
||
|
|
putBooleanBigEndian(target, offset, value);
|
||
|
|
} else {
|
||
|
|
putBooleanLittleEndian(target, offset, value);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public float getFloat(Object target, long offset) {
|
||
|
|
return Float.intBitsToFloat(getInt(target, offset));
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putFloat(Object target, long offset, float value) {
|
||
|
|
putInt(target, offset, Float.floatToIntBits(value));
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public double getDouble(Object target, long offset) {
|
||
|
|
return Double.longBitsToDouble(getLong(target, offset));
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putDouble(Object target, long offset, double value) {
|
||
|
|
putLong(target, offset, Double.doubleToLongBits(value));
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public boolean supportsUnsafeByteBufferOperations() {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public byte getByte(long address) {
|
||
|
|
throw new UnsupportedOperationException();
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putByte(long address, byte value) {
|
||
|
|
throw new UnsupportedOperationException();
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public int getInt(long address) {
|
||
|
|
throw new UnsupportedOperationException();
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putInt(long address, int value) {
|
||
|
|
throw new UnsupportedOperationException();
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public long getLong(long address) {
|
||
|
|
throw new UnsupportedOperationException();
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putLong(long address, long value) {
|
||
|
|
throw new UnsupportedOperationException();
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void copyMemory(long srcOffset, byte[] target, long targetIndex, long length) {
|
||
|
|
throw new UnsupportedOperationException();
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void copyMemory(byte[] src, long srcIndex, long targetOffset, long length) {
|
||
|
|
throw new UnsupportedOperationException();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private static final class Android32MemoryAccessor extends MemoryAccessor {
|
||
|
|
|
||
|
|
/** Mask used to convert a 64 bit memory address to a 32 bit address. */
|
||
|
|
private static final long SMALL_ADDRESS_MASK = 0x00000000FFFFFFFF;
|
||
|
|
|
||
|
|
/** Truncate a {@code long} address into a short {@code int} address. */
|
||
|
|
private static int smallAddress(long address) {
|
||
|
|
return (int) (SMALL_ADDRESS_MASK & address);
|
||
|
|
}
|
||
|
|
|
||
|
|
Android32MemoryAccessor(sun.misc.Unsafe unsafe) {
|
||
|
|
super(unsafe);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public Object getStaticObject(Field field) {
|
||
|
|
try {
|
||
|
|
return field.get(null);
|
||
|
|
} catch (IllegalAccessException e) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public byte getByte(Object target, long offset) {
|
||
|
|
if (IS_BIG_ENDIAN) {
|
||
|
|
return getByteBigEndian(target, offset);
|
||
|
|
} else {
|
||
|
|
return getByteLittleEndian(target, offset);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putByte(Object target, long offset, byte value) {
|
||
|
|
if (IS_BIG_ENDIAN) {
|
||
|
|
putByteBigEndian(target, offset, value);
|
||
|
|
} else {
|
||
|
|
putByteLittleEndian(target, offset, value);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public boolean getBoolean(Object target, long offset) {
|
||
|
|
if (IS_BIG_ENDIAN) {
|
||
|
|
return getBooleanBigEndian(target, offset);
|
||
|
|
} else {
|
||
|
|
return getBooleanLittleEndian(target, offset);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putBoolean(Object target, long offset, boolean value) {
|
||
|
|
if (IS_BIG_ENDIAN) {
|
||
|
|
putBooleanBigEndian(target, offset, value);
|
||
|
|
} else {
|
||
|
|
putBooleanLittleEndian(target, offset, value);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public float getFloat(Object target, long offset) {
|
||
|
|
return Float.intBitsToFloat(getInt(target, offset));
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putFloat(Object target, long offset, float value) {
|
||
|
|
putInt(target, offset, Float.floatToIntBits(value));
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public double getDouble(Object target, long offset) {
|
||
|
|
return Double.longBitsToDouble(getLong(target, offset));
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putDouble(Object target, long offset, double value) {
|
||
|
|
putLong(target, offset, Double.doubleToLongBits(value));
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public boolean supportsUnsafeByteBufferOperations() {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public byte getByte(long address) {
|
||
|
|
throw new UnsupportedOperationException();
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putByte(long address, byte value) {
|
||
|
|
throw new UnsupportedOperationException();
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public int getInt(long address) {
|
||
|
|
throw new UnsupportedOperationException();
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putInt(long address, int value) {
|
||
|
|
throw new UnsupportedOperationException();
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public long getLong(long address) {
|
||
|
|
throw new UnsupportedOperationException();
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void putLong(long address, long value) {
|
||
|
|
throw new UnsupportedOperationException();
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void copyMemory(long srcOffset, byte[] target, long targetIndex, long length) {
|
||
|
|
throw new UnsupportedOperationException();
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void copyMemory(byte[] src, long srcIndex, long targetOffset, long length) {
|
||
|
|
throw new UnsupportedOperationException();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private static byte getByteBigEndian(Object target, long offset) {
|
||
|
|
return (byte) ((getInt(target, offset & ~3) >>> ((~offset & 3) << 3)) & 0xFF);
|
||
|
|
}
|
||
|
|
|
||
|
|
private static byte getByteLittleEndian(Object target, long offset) {
|
||
|
|
return (byte) ((getInt(target, offset & ~3) >>> ((offset & 3) << 3)) & 0xFF);
|
||
|
|
}
|
||
|
|
|
||
|
|
private static void putByteBigEndian(Object target, long offset, byte value) {
|
||
|
|
int intValue = getInt(target, offset & ~3);
|
||
|
|
int shift = ((~(int) offset) & 3) << 3;
|
||
|
|
int output = (intValue & ~(0xFF << shift)) | ((0xFF & value) << shift);
|
||
|
|
putInt(target, offset & ~3, output);
|
||
|
|
}
|
||
|
|
|
||
|
|
private static void putByteLittleEndian(Object target, long offset, byte value) {
|
||
|
|
int intValue = getInt(target, offset & ~3);
|
||
|
|
int shift = (((int) offset) & 3) << 3;
|
||
|
|
int output = (intValue & ~(0xFF << shift)) | ((0xFF & value) << shift);
|
||
|
|
putInt(target, offset & ~3, output);
|
||
|
|
}
|
||
|
|
|
||
|
|
private static boolean getBooleanBigEndian(Object target, long offset) {
|
||
|
|
return getByteBigEndian(target, offset) != 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
private static boolean getBooleanLittleEndian(Object target, long offset) {
|
||
|
|
return getByteLittleEndian(target, offset) != 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
private static void putBooleanBigEndian(Object target, long offset, boolean value) {
|
||
|
|
putByteBigEndian(target, offset, (byte) (value ? 1 : 0));
|
||
|
|
}
|
||
|
|
|
||
|
|
private static void putBooleanLittleEndian(Object target, long offset, boolean value) {
|
||
|
|
putByteLittleEndian(target, offset, (byte) (value ? 1 : 0));
|
||
|
|
}
|
||
|
|
|
||
|
|
private static void logMissingMethod(Throwable e) {
|
||
|
|
Logger.getLogger(UnsafeUtil.class.getName())
|
||
|
|
.log(
|
||
|
|
Level.WARNING,
|
||
|
|
"platform method missing - proto runtime falling back to safer methods: " + e);
|
||
|
|
}
|
||
|
|
}
|