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io.netty.util.internal.PlatformDependent0 Maven / Gradle / Ivy
/*
* Copyright 2013 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.util.internal;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import sun.misc.Unsafe;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.security.AccessController;
import java.security.PrivilegedAction;
import static io.netty.util.internal.ObjectUtil.checkNotNull;
/**
* The {@link PlatformDependent} operations which requires access to {@code sun.misc.*}.
*/
@SuppressJava6Requirement(reason = "Unsafe access is guarded")
final class PlatformDependent0 {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(PlatformDependent0.class);
private static final long ADDRESS_FIELD_OFFSET;
private static final long BYTE_ARRAY_BASE_OFFSET;
private static final long INT_ARRAY_BASE_OFFSET;
private static final long INT_ARRAY_INDEX_SCALE;
private static final long LONG_ARRAY_BASE_OFFSET;
private static final long LONG_ARRAY_INDEX_SCALE;
private static final Constructor DIRECT_BUFFER_CONSTRUCTOR;
private static final Throwable EXPLICIT_NO_UNSAFE_CAUSE = explicitNoUnsafeCause0();
private static final Method ALLOCATE_ARRAY_METHOD;
private static final Method ALIGN_SLICE;
private static final int JAVA_VERSION = javaVersion0();
private static final boolean IS_ANDROID = isAndroid0();
private static final boolean STORE_FENCE_AVAILABLE;
private static final Throwable UNSAFE_UNAVAILABILITY_CAUSE;
private static final Object INTERNAL_UNSAFE;
// See https://github.com/oracle/graal/blob/master/sdk/src/org.graalvm.nativeimage/src/org/graalvm/nativeimage/
// ImageInfo.java
private static final boolean RUNNING_IN_NATIVE_IMAGE = SystemPropertyUtil.contains(
"org.graalvm.nativeimage.imagecode");
private static final boolean IS_EXPLICIT_TRY_REFLECTION_SET_ACCESSIBLE = explicitTryReflectionSetAccessible0();
static final Unsafe UNSAFE;
// constants borrowed from murmur3
static final int HASH_CODE_ASCII_SEED = 0xc2b2ae35;
static final int HASH_CODE_C1 = 0xcc9e2d51;
static final int HASH_CODE_C2 = 0x1b873593;
/**
* Limits the number of bytes to copy per {@link Unsafe#copyMemory(long, long, long)} to allow safepoint polling
* during a large copy.
*/
private static final long UNSAFE_COPY_THRESHOLD = 1024L * 1024L;
private static final boolean UNALIGNED;
static {
final ByteBuffer direct;
Field addressField = null;
Method allocateArrayMethod = null;
Throwable unsafeUnavailabilityCause = null;
Unsafe unsafe;
Object internalUnsafe = null;
boolean storeFenceAvailable = false;
if ((unsafeUnavailabilityCause = EXPLICIT_NO_UNSAFE_CAUSE) != null) {
direct = null;
addressField = null;
unsafe = null;
internalUnsafe = null;
} else {
direct = ByteBuffer.allocateDirect(1);
// attempt to access field Unsafe#theUnsafe
final Object maybeUnsafe = AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Object run() {
try {
final Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe");
// We always want to try using Unsafe as the access still works on java9 as well and
// we need it for out native-transports and many optimizations.
Throwable cause = ReflectionUtil.trySetAccessible(unsafeField, false);
if (cause != null) {
return cause;
}
// the unsafe instance
return unsafeField.get(null);
} catch (NoSuchFieldException e) {
return e;
} catch (SecurityException e) {
return e;
} catch (IllegalAccessException e) {
return e;
} catch (NoClassDefFoundError e) {
// Also catch NoClassDefFoundError in case someone uses for example OSGI and it made
// Unsafe unloadable.
return e;
}
}
});
// the conditional check here can not be replaced with checking that maybeUnsafe
// is an instanceof Unsafe and reversing the if and else blocks; this is because an
// instanceof check against Unsafe will trigger a class load and we might not have
// the runtime permission accessClassInPackage.sun.misc
if (maybeUnsafe instanceof Throwable) {
unsafe = null;
unsafeUnavailabilityCause = (Throwable) maybeUnsafe;
if (logger.isTraceEnabled()) {
logger.debug("sun.misc.Unsafe.theUnsafe: unavailable", (Throwable) maybeUnsafe);
} else {
logger.debug("sun.misc.Unsafe.theUnsafe: unavailable: {}", ((Throwable) maybeUnsafe).getMessage());
}
} else {
unsafe = (Unsafe) maybeUnsafe;
logger.debug("sun.misc.Unsafe.theUnsafe: available");
}
// ensure the unsafe supports all necessary methods to work around the mistake in the latest OpenJDK
// https://github.com/netty/netty/issues/1061
// https://www.mail-archive.com/[email protected] /msg00698.html
if (unsafe != null) {
final Unsafe finalUnsafe = unsafe;
final Object maybeException = AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Object run() {
try {
finalUnsafe.getClass().getDeclaredMethod(
"copyMemory", Object.class, long.class, Object.class, long.class, long.class);
return null;
} catch (NoSuchMethodException e) {
return e;
} catch (SecurityException e) {
return e;
}
}
});
if (maybeException == null) {
logger.debug("sun.misc.Unsafe.copyMemory: available");
} else {
// Unsafe.copyMemory(Object, long, Object, long, long) unavailable.
unsafe = null;
unsafeUnavailabilityCause = (Throwable) maybeException;
if (logger.isTraceEnabled()) {
logger.debug("sun.misc.Unsafe.copyMemory: unavailable", (Throwable) maybeException);
} else {
logger.debug("sun.misc.Unsafe.copyMemory: unavailable: {}",
((Throwable) maybeException).getMessage());
}
}
}
// ensure Unsafe::storeFence to be available: jdk < 8 shouldn't have it
if (unsafe != null) {
final Unsafe finalUnsafe = unsafe;
final Object maybeException = AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Object run() {
try {
finalUnsafe.getClass().getDeclaredMethod("storeFence");
return null;
} catch (NoSuchMethodException e) {
return e;
} catch (SecurityException e) {
return e;
}
}
});
if (maybeException == null) {
logger.debug("sun.misc.Unsafe.storeFence: available");
storeFenceAvailable = true;
} else {
storeFenceAvailable = false;
// Unsafe.storeFence unavailable.
if (logger.isTraceEnabled()) {
logger.debug("sun.misc.Unsafe.storeFence: unavailable", (Throwable) maybeException);
} else {
logger.debug("sun.misc.Unsafe.storeFence: unavailable: {}",
((Throwable) maybeException).getMessage());
}
}
}
if (unsafe != null) {
final Unsafe finalUnsafe = unsafe;
// attempt to access field Buffer#address
final Object maybeAddressField = AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Object run() {
try {
final Field field = Buffer.class.getDeclaredField("address");
// Use Unsafe to read value of the address field. This way it will not fail on JDK9+ which
// will forbid changing the access level via reflection.
final long offset = finalUnsafe.objectFieldOffset(field);
final long address = finalUnsafe.getLong(direct, offset);
// if direct really is a direct buffer, address will be non-zero
if (address == 0) {
return null;
}
return field;
} catch (NoSuchFieldException e) {
return e;
} catch (SecurityException e) {
return e;
}
}
});
if (maybeAddressField instanceof Field) {
addressField = (Field) maybeAddressField;
logger.debug("java.nio.Buffer.address: available");
} else {
unsafeUnavailabilityCause = (Throwable) maybeAddressField;
if (logger.isTraceEnabled()) {
logger.debug("java.nio.Buffer.address: unavailable", (Throwable) maybeAddressField);
} else {
logger.debug("java.nio.Buffer.address: unavailable: {}",
((Throwable) maybeAddressField).getMessage());
}
// If we cannot access the address of a direct buffer, there's no point of using unsafe.
// Let's just pretend unsafe is unavailable for overall simplicity.
unsafe = null;
}
}
if (unsafe != null) {
// There are assumptions made where ever BYTE_ARRAY_BASE_OFFSET is used (equals, hashCodeAscii, and
// primitive accessors) that arrayIndexScale == 1, and results are undefined if this is not the case.
long byteArrayIndexScale = unsafe.arrayIndexScale(byte[].class);
if (byteArrayIndexScale != 1) {
logger.debug("unsafe.arrayIndexScale is {} (expected: 1). Not using unsafe.", byteArrayIndexScale);
unsafeUnavailabilityCause = new UnsupportedOperationException("Unexpected unsafe.arrayIndexScale");
unsafe = null;
}
}
}
UNSAFE_UNAVAILABILITY_CAUSE = unsafeUnavailabilityCause;
UNSAFE = unsafe;
if (unsafe == null) {
ADDRESS_FIELD_OFFSET = -1;
BYTE_ARRAY_BASE_OFFSET = -1;
LONG_ARRAY_BASE_OFFSET = -1;
LONG_ARRAY_INDEX_SCALE = -1;
INT_ARRAY_BASE_OFFSET = -1;
INT_ARRAY_INDEX_SCALE = -1;
UNALIGNED = false;
DIRECT_BUFFER_CONSTRUCTOR = null;
ALLOCATE_ARRAY_METHOD = null;
STORE_FENCE_AVAILABLE = false;
} else {
Constructor directBufferConstructor;
long address = -1;
try {
final Object maybeDirectBufferConstructor =
AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Object run() {
try {
final Constructor constructor = javaVersion() >= 21 ?
direct.getClass().getDeclaredConstructor(long.class, long.class) :
direct.getClass().getDeclaredConstructor(long.class, int.class);
Throwable cause = ReflectionUtil.trySetAccessible(constructor, true);
if (cause != null) {
return cause;
}
return constructor;
} catch (NoSuchMethodException e) {
return e;
} catch (SecurityException e) {
return e;
}
}
});
if (maybeDirectBufferConstructor instanceof Constructor) {
address = UNSAFE.allocateMemory(1);
// try to use the constructor now
try {
((Constructor) maybeDirectBufferConstructor).newInstance(address, 1);
directBufferConstructor = (Constructor) maybeDirectBufferConstructor;
logger.debug("direct buffer constructor: available");
} catch (InstantiationException e) {
directBufferConstructor = null;
} catch (IllegalAccessException e) {
directBufferConstructor = null;
} catch (InvocationTargetException e) {
directBufferConstructor = null;
}
} else {
if (logger.isTraceEnabled()) {
logger.debug("direct buffer constructor: unavailable",
(Throwable) maybeDirectBufferConstructor);
} else {
logger.debug("direct buffer constructor: unavailable: {}",
((Throwable) maybeDirectBufferConstructor).getMessage());
}
directBufferConstructor = null;
}
} finally {
if (address != -1) {
UNSAFE.freeMemory(address);
}
}
DIRECT_BUFFER_CONSTRUCTOR = directBufferConstructor;
ADDRESS_FIELD_OFFSET = objectFieldOffset(addressField);
BYTE_ARRAY_BASE_OFFSET = UNSAFE.arrayBaseOffset(byte[].class);
INT_ARRAY_BASE_OFFSET = UNSAFE.arrayBaseOffset(int[].class);
INT_ARRAY_INDEX_SCALE = UNSAFE.arrayIndexScale(int[].class);
LONG_ARRAY_BASE_OFFSET = UNSAFE.arrayBaseOffset(long[].class);
LONG_ARRAY_INDEX_SCALE = UNSAFE.arrayIndexScale(long[].class);
final boolean unaligned;
Object maybeUnaligned = AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Object run() {
try {
Class bitsClass =
Class.forName("java.nio.Bits", false, getSystemClassLoader());
int version = javaVersion();
if (unsafeStaticFieldOffsetSupported() && version >= 9) {
// Java9/10 use all lowercase and later versions all uppercase.
String fieldName = version >= 11 ? "UNALIGNED" : "unaligned";
// On Java9 and later we try to directly access the field as we can do this without
// adjust the accessible levels.
try {
Field unalignedField = bitsClass.getDeclaredField(fieldName);
if (unalignedField.getType() == boolean.class) {
long offset = UNSAFE.staticFieldOffset(unalignedField);
Object object = UNSAFE.staticFieldBase(unalignedField);
return UNSAFE.getBoolean(object, offset);
}
// There is something unexpected stored in the field,
// let us fall-back and try to use a reflective method call as last resort.
} catch (NoSuchFieldException ignore) {
// We did not find the field we expected, move on.
}
}
Method unalignedMethod = bitsClass.getDeclaredMethod("unaligned");
Throwable cause = ReflectionUtil.trySetAccessible(unalignedMethod, true);
if (cause != null) {
return cause;
}
return unalignedMethod.invoke(null);
} catch (NoSuchMethodException e) {
return e;
} catch (SecurityException e) {
return e;
} catch (IllegalAccessException e) {
return e;
} catch (ClassNotFoundException e) {
return e;
} catch (InvocationTargetException e) {
return e;
}
}
});
if (maybeUnaligned instanceof Boolean) {
unaligned = (Boolean) maybeUnaligned;
logger.debug("java.nio.Bits.unaligned: available, {}", unaligned);
} else {
String arch = SystemPropertyUtil.get("os.arch", "");
//noinspection DynamicRegexReplaceableByCompiledPattern
unaligned = arch.matches("^(i[3-6]86|x86(_64)?|x64|amd64)$");
Throwable t = (Throwable) maybeUnaligned;
if (logger.isTraceEnabled()) {
logger.debug("java.nio.Bits.unaligned: unavailable, {}", unaligned, t);
} else {
logger.debug("java.nio.Bits.unaligned: unavailable, {}, {}", unaligned, t.getMessage());
}
}
UNALIGNED = unaligned;
if (javaVersion() >= 9) {
Object maybeException = AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Object run() {
try {
// Java9 has jdk.internal.misc.Unsafe and not all methods are propagated to
// sun.misc.Unsafe
Class internalUnsafeClass = getClassLoader(PlatformDependent0.class)
.loadClass("jdk.internal.misc.Unsafe");
Method method = internalUnsafeClass.getDeclaredMethod("getUnsafe");
return method.invoke(null);
} catch (Throwable e) {
return e;
}
}
});
if (!(maybeException instanceof Throwable)) {
internalUnsafe = maybeException;
final Object finalInternalUnsafe = internalUnsafe;
maybeException = AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Object run() {
try {
return finalInternalUnsafe.getClass().getDeclaredMethod(
"allocateUninitializedArray", Class.class, int.class);
} catch (NoSuchMethodException e) {
return e;
} catch (SecurityException e) {
return e;
}
}
});
if (maybeException instanceof Method) {
try {
Method m = (Method) maybeException;
byte[] bytes = (byte[]) m.invoke(finalInternalUnsafe, byte.class, 8);
assert bytes.length == 8;
allocateArrayMethod = m;
} catch (IllegalAccessException e) {
maybeException = e;
} catch (InvocationTargetException e) {
maybeException = e;
}
}
}
if (maybeException instanceof Throwable) {
if (logger.isTraceEnabled()) {
logger.debug("jdk.internal.misc.Unsafe.allocateUninitializedArray(int): unavailable",
(Throwable) maybeException);
} else {
logger.debug("jdk.internal.misc.Unsafe.allocateUninitializedArray(int): unavailable: {}",
((Throwable) maybeException).getMessage());
}
} else {
logger.debug("jdk.internal.misc.Unsafe.allocateUninitializedArray(int): available");
}
} else {
logger.debug("jdk.internal.misc.Unsafe.allocateUninitializedArray(int): unavailable prior to Java9");
}
ALLOCATE_ARRAY_METHOD = allocateArrayMethod;
STORE_FENCE_AVAILABLE = storeFenceAvailable;
}
if (javaVersion() > 9) {
ALIGN_SLICE = (Method) AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Object run() {
try {
return ByteBuffer.class.getDeclaredMethod("alignedSlice", int.class);
} catch (Exception e) {
return null;
}
}
});
} else {
ALIGN_SLICE = null;
}
INTERNAL_UNSAFE = internalUnsafe;
logger.debug("java.nio.DirectByteBuffer.(long, {int,long}): {}",
DIRECT_BUFFER_CONSTRUCTOR != null ? "available" : "unavailable");
}
private static boolean unsafeStaticFieldOffsetSupported() {
return !RUNNING_IN_NATIVE_IMAGE;
}
static boolean isExplicitNoUnsafe() {
return EXPLICIT_NO_UNSAFE_CAUSE != null;
}
private static Throwable explicitNoUnsafeCause0() {
final boolean noUnsafe = SystemPropertyUtil.getBoolean("io.netty.noUnsafe", false);
logger.debug("-Dio.netty.noUnsafe: {}", noUnsafe);
if (noUnsafe) {
logger.debug("sun.misc.Unsafe: unavailable (io.netty.noUnsafe)");
return new UnsupportedOperationException("sun.misc.Unsafe: unavailable (io.netty.noUnsafe)");
}
// Legacy properties
String unsafePropName;
if (SystemPropertyUtil.contains("io.netty.tryUnsafe")) {
unsafePropName = "io.netty.tryUnsafe";
} else {
unsafePropName = "org.apache.activemq.artemis.shaded.org.jboss.netty.tryUnsafe";
}
if (!SystemPropertyUtil.getBoolean(unsafePropName, true)) {
String msg = "sun.misc.Unsafe: unavailable (" + unsafePropName + ")";
logger.debug(msg);
return new UnsupportedOperationException(msg);
}
return null;
}
static boolean isUnaligned() {
return UNALIGNED;
}
static boolean hasUnsafe() {
return UNSAFE != null;
}
static Throwable getUnsafeUnavailabilityCause() {
return UNSAFE_UNAVAILABILITY_CAUSE;
}
static boolean unalignedAccess() {
return UNALIGNED;
}
static void throwException(Throwable cause) {
// JVM has been observed to crash when passing a null argument. See https://github.com/netty/netty/issues/4131.
UNSAFE.throwException(checkNotNull(cause, "cause"));
}
static boolean hasDirectBufferNoCleanerConstructor() {
return DIRECT_BUFFER_CONSTRUCTOR != null;
}
static ByteBuffer reallocateDirectNoCleaner(ByteBuffer buffer, int capacity) {
return newDirectBuffer(UNSAFE.reallocateMemory(directBufferAddress(buffer), capacity), capacity);
}
static ByteBuffer allocateDirectNoCleaner(int capacity) {
// Calling malloc with capacity of 0 may return a null ptr or a memory address that can be used.
// Just use 1 to make it safe to use in all cases:
// See: https://pubs.opengroup.org/onlinepubs/009695399/functions/malloc.html
return newDirectBuffer(UNSAFE.allocateMemory(Math.max(1, capacity)), capacity);
}
static boolean hasAlignSliceMethod() {
return ALIGN_SLICE != null;
}
static ByteBuffer alignSlice(ByteBuffer buffer, int alignment) {
try {
return (ByteBuffer) ALIGN_SLICE.invoke(buffer, alignment);
} catch (IllegalAccessException e) {
throw new Error(e);
} catch (InvocationTargetException e) {
throw new Error(e);
}
}
static boolean hasAllocateArrayMethod() {
return ALLOCATE_ARRAY_METHOD != null;
}
static byte[] allocateUninitializedArray(int size) {
try {
return (byte[]) ALLOCATE_ARRAY_METHOD.invoke(INTERNAL_UNSAFE, byte.class, size);
} catch (IllegalAccessException e) {
throw new Error(e);
} catch (InvocationTargetException e) {
throw new Error(e);
}
}
static ByteBuffer newDirectBuffer(long address, int capacity) {
ObjectUtil.checkPositiveOrZero(capacity, "capacity");
try {
return (ByteBuffer) DIRECT_BUFFER_CONSTRUCTOR.newInstance(address, capacity);
} catch (Throwable cause) {
// Not expected to ever throw!
if (cause instanceof Error) {
throw (Error) cause;
}
throw new Error(cause);
}
}
static long directBufferAddress(ByteBuffer buffer) {
return getLong(buffer, ADDRESS_FIELD_OFFSET);
}
static long byteArrayBaseOffset() {
return BYTE_ARRAY_BASE_OFFSET;
}
static Object getObject(Object object, long fieldOffset) {
return UNSAFE.getObject(object, fieldOffset);
}
static int getInt(Object object, long fieldOffset) {
return UNSAFE.getInt(object, fieldOffset);
}
static void safeConstructPutInt(Object object, long fieldOffset, int value) {
if (STORE_FENCE_AVAILABLE) {
UNSAFE.putInt(object, fieldOffset, value);
UNSAFE.storeFence();
} else {
UNSAFE.putIntVolatile(object, fieldOffset, value);
}
}
private static long getLong(Object object, long fieldOffset) {
return UNSAFE.getLong(object, fieldOffset);
}
static long objectFieldOffset(Field field) {
return UNSAFE.objectFieldOffset(field);
}
static byte getByte(long address) {
return UNSAFE.getByte(address);
}
static short getShort(long address) {
return UNSAFE.getShort(address);
}
static int getInt(long address) {
return UNSAFE.getInt(address);
}
static long getLong(long address) {
return UNSAFE.getLong(address);
}
static byte getByte(byte[] data, int index) {
return UNSAFE.getByte(data, BYTE_ARRAY_BASE_OFFSET + index);
}
static byte getByte(byte[] data, long index) {
return UNSAFE.getByte(data, BYTE_ARRAY_BASE_OFFSET + index);
}
static short getShort(byte[] data, int index) {
return UNSAFE.getShort(data, BYTE_ARRAY_BASE_OFFSET + index);
}
static int getInt(byte[] data, int index) {
return UNSAFE.getInt(data, BYTE_ARRAY_BASE_OFFSET + index);
}
static int getInt(int[] data, long index) {
return UNSAFE.getInt(data, INT_ARRAY_BASE_OFFSET + INT_ARRAY_INDEX_SCALE * index);
}
static int getIntVolatile(long address) {
return UNSAFE.getIntVolatile(null, address);
}
static void putIntOrdered(long adddress, int newValue) {
UNSAFE.putOrderedInt(null, adddress, newValue);
}
static long getLong(byte[] data, int index) {
return UNSAFE.getLong(data, BYTE_ARRAY_BASE_OFFSET + index);
}
static long getLong(long[] data, long index) {
return UNSAFE.getLong(data, LONG_ARRAY_BASE_OFFSET + LONG_ARRAY_INDEX_SCALE * index);
}
static void putByte(long address, byte value) {
UNSAFE.putByte(address, value);
}
static void putShort(long address, short value) {
UNSAFE.putShort(address, value);
}
static void putInt(long address, int value) {
UNSAFE.putInt(address, value);
}
static void putLong(long address, long value) {
UNSAFE.putLong(address, value);
}
static void putByte(byte[] data, int index, byte value) {
UNSAFE.putByte(data, BYTE_ARRAY_BASE_OFFSET + index, value);
}
static void putByte(Object data, long offset, byte value) {
UNSAFE.putByte(data, offset, value);
}
static void putShort(byte[] data, int index, short value) {
UNSAFE.putShort(data, BYTE_ARRAY_BASE_OFFSET + index, value);
}
static void putInt(byte[] data, int index, int value) {
UNSAFE.putInt(data, BYTE_ARRAY_BASE_OFFSET + index, value);
}
static void putLong(byte[] data, int index, long value) {
UNSAFE.putLong(data, BYTE_ARRAY_BASE_OFFSET + index, value);
}
static void putObject(Object o, long offset, Object x) {
UNSAFE.putObject(o, offset, x);
}
static void copyMemory(long srcAddr, long dstAddr, long length) {
// Manual safe-point polling is only needed prior Java9:
// See https://bugs.openjdk.java.net/browse/JDK-8149596
if (javaVersion() <= 8) {
copyMemoryWithSafePointPolling(srcAddr, dstAddr, length);
} else {
UNSAFE.copyMemory(srcAddr, dstAddr, length);
}
}
private static void copyMemoryWithSafePointPolling(long srcAddr, long dstAddr, long length) {
while (length > 0) {
long size = Math.min(length, UNSAFE_COPY_THRESHOLD);
UNSAFE.copyMemory(srcAddr, dstAddr, size);
length -= size;
srcAddr += size;
dstAddr += size;
}
}
static void copyMemory(Object src, long srcOffset, Object dst, long dstOffset, long length) {
// Manual safe-point polling is only needed prior Java9:
// See https://bugs.openjdk.java.net/browse/JDK-8149596
if (javaVersion() <= 8) {
copyMemoryWithSafePointPolling(src, srcOffset, dst, dstOffset, length);
} else {
UNSAFE.copyMemory(src, srcOffset, dst, dstOffset, length);
}
}
private static void copyMemoryWithSafePointPolling(
Object src, long srcOffset, Object dst, long dstOffset, long length) {
while (length > 0) {
long size = Math.min(length, UNSAFE_COPY_THRESHOLD);
UNSAFE.copyMemory(src, srcOffset, dst, dstOffset, size);
length -= size;
srcOffset += size;
dstOffset += size;
}
}
static void setMemory(long address, long bytes, byte value) {
UNSAFE.setMemory(address, bytes, value);
}
static void setMemory(Object o, long offset, long bytes, byte value) {
UNSAFE.setMemory(o, offset, bytes, value);
}
static boolean equals(byte[] bytes1, int startPos1, byte[] bytes2, int startPos2, int length) {
int remainingBytes = length & 7;
final long baseOffset1 = BYTE_ARRAY_BASE_OFFSET + startPos1;
final long diff = startPos2 - startPos1;
if (length >= 8) {
final long end = baseOffset1 + remainingBytes;
for (long i = baseOffset1 - 8 + length; i >= end; i -= 8) {
if (UNSAFE.getLong(bytes1, i) != UNSAFE.getLong(bytes2, i + diff)) {
return false;
}
}
}
if (remainingBytes >= 4) {
remainingBytes -= 4;
long pos = baseOffset1 + remainingBytes;
if (UNSAFE.getInt(bytes1, pos) != UNSAFE.getInt(bytes2, pos + diff)) {
return false;
}
}
final long baseOffset2 = baseOffset1 + diff;
if (remainingBytes >= 2) {
return UNSAFE.getChar(bytes1, baseOffset1) == UNSAFE.getChar(bytes2, baseOffset2) &&
(remainingBytes == 2 ||
UNSAFE.getByte(bytes1, baseOffset1 + 2) == UNSAFE.getByte(bytes2, baseOffset2 + 2));
}
return remainingBytes == 0 ||
UNSAFE.getByte(bytes1, baseOffset1) == UNSAFE.getByte(bytes2, baseOffset2);
}
static int equalsConstantTime(byte[] bytes1, int startPos1, byte[] bytes2, int startPos2, int length) {
long result = 0;
long remainingBytes = length & 7;
final long baseOffset1 = BYTE_ARRAY_BASE_OFFSET + startPos1;
final long end = baseOffset1 + remainingBytes;
final long diff = startPos2 - startPos1;
for (long i = baseOffset1 - 8 + length; i >= end; i -= 8) {
result |= UNSAFE.getLong(bytes1, i) ^ UNSAFE.getLong(bytes2, i + diff);
}
if (remainingBytes >= 4) {
result |= UNSAFE.getInt(bytes1, baseOffset1) ^ UNSAFE.getInt(bytes2, baseOffset1 + diff);
remainingBytes -= 4;
}
if (remainingBytes >= 2) {
long pos = end - remainingBytes;
result |= UNSAFE.getChar(bytes1, pos) ^ UNSAFE.getChar(bytes2, pos + diff);
remainingBytes -= 2;
}
if (remainingBytes == 1) {
long pos = end - 1;
result |= UNSAFE.getByte(bytes1, pos) ^ UNSAFE.getByte(bytes2, pos + diff);
}
return ConstantTimeUtils.equalsConstantTime(result, 0);
}
static boolean isZero(byte[] bytes, int startPos, int length) {
if (length <= 0) {
return true;
}
final long baseOffset = BYTE_ARRAY_BASE_OFFSET + startPos;
int remainingBytes = length & 7;
final long end = baseOffset + remainingBytes;
for (long i = baseOffset - 8 + length; i >= end; i -= 8) {
if (UNSAFE.getLong(bytes, i) != 0) {
return false;
}
}
if (remainingBytes >= 4) {
remainingBytes -= 4;
if (UNSAFE.getInt(bytes, baseOffset + remainingBytes) != 0) {
return false;
}
}
if (remainingBytes >= 2) {
return UNSAFE.getChar(bytes, baseOffset) == 0 &&
(remainingBytes == 2 || bytes[startPos + 2] == 0);
}
return bytes[startPos] == 0;
}
static int hashCodeAscii(byte[] bytes, int startPos, int length) {
int hash = HASH_CODE_ASCII_SEED;
long baseOffset = BYTE_ARRAY_BASE_OFFSET + startPos;
final int remainingBytes = length & 7;
final long end = baseOffset + remainingBytes;
for (long i = baseOffset - 8 + length; i >= end; i -= 8) {
hash = hashCodeAsciiCompute(UNSAFE.getLong(bytes, i), hash);
}
if (remainingBytes == 0) {
return hash;
}
int hcConst = HASH_CODE_C1;
if (remainingBytes != 2 & remainingBytes != 4 & remainingBytes != 6) { // 1, 3, 5, 7
hash = hash * HASH_CODE_C1 + hashCodeAsciiSanitize(UNSAFE.getByte(bytes, baseOffset));
hcConst = HASH_CODE_C2;
baseOffset++;
}
if (remainingBytes != 1 & remainingBytes != 4 & remainingBytes != 5) { // 2, 3, 6, 7
hash = hash * hcConst + hashCodeAsciiSanitize(UNSAFE.getShort(bytes, baseOffset));
hcConst = hcConst == HASH_CODE_C1 ? HASH_CODE_C2 : HASH_CODE_C1;
baseOffset += 2;
}
if (remainingBytes >= 4) { // 4, 5, 6, 7
return hash * hcConst + hashCodeAsciiSanitize(UNSAFE.getInt(bytes, baseOffset));
}
return hash;
}
static int hashCodeAsciiCompute(long value, int hash) {
// masking with 0x1f reduces the number of overall bits that impact the hash code but makes the hash
// code the same regardless of character case (upper case or lower case hash is the same).
return hash * HASH_CODE_C1 +
// Low order int
hashCodeAsciiSanitize((int) value) * HASH_CODE_C2 +
// High order int
(int) ((value & 0x1f1f1f1f00000000L) >>> 32);
}
static int hashCodeAsciiSanitize(int value) {
return value & 0x1f1f1f1f;
}
static int hashCodeAsciiSanitize(short value) {
return value & 0x1f1f;
}
static int hashCodeAsciiSanitize(byte value) {
return value & 0x1f;
}
static ClassLoader getClassLoader(final Class clazz) {
if (System.getSecurityManager() == null) {
return clazz.getClassLoader();
} else {
return AccessController.doPrivileged(new PrivilegedAction() {
@Override
public ClassLoader run() {
return clazz.getClassLoader();
}
});
}
}
static ClassLoader getContextClassLoader() {
if (System.getSecurityManager() == null) {
return Thread.currentThread().getContextClassLoader();
} else {
return AccessController.doPrivileged(new PrivilegedAction() {
@Override
public ClassLoader run() {
return Thread.currentThread().getContextClassLoader();
}
});
}
}
static ClassLoader getSystemClassLoader() {
if (System.getSecurityManager() == null) {
return ClassLoader.getSystemClassLoader();
} else {
return AccessController.doPrivileged(new PrivilegedAction() {
@Override
public ClassLoader run() {
return ClassLoader.getSystemClassLoader();
}
});
}
}
static int addressSize() {
return UNSAFE.addressSize();
}
static long allocateMemory(long size) {
return UNSAFE.allocateMemory(size);
}
static void freeMemory(long address) {
UNSAFE.freeMemory(address);
}
static long reallocateMemory(long address, long newSize) {
return UNSAFE.reallocateMemory(address, newSize);
}
static boolean isAndroid() {
return IS_ANDROID;
}
private static boolean isAndroid0() {
// Idea: Sometimes java binaries include Android classes on the classpath, even if it isn't actually Android.
// Rather than check if certain classes are present, just check the VM, which is tied to the JDK.
// Optional improvement: check if `android.os.Build.VERSION` is >= 24. On later versions of Android, the
// OpenJDK is used, which means `Unsafe` will actually work as expected.
// Android sets this property to Dalvik, regardless of whether it actually is.
String vmName = SystemPropertyUtil.get("java.vm.name");
boolean isAndroid = "Dalvik".equals(vmName);
if (isAndroid) {
logger.debug("Platform: Android");
}
return isAndroid;
}
private static boolean explicitTryReflectionSetAccessible0() {
// we disable reflective access
return SystemPropertyUtil.getBoolean("io.netty.tryReflectionSetAccessible",
javaVersion() < 9 || RUNNING_IN_NATIVE_IMAGE);
}
static boolean isExplicitTryReflectionSetAccessible() {
return IS_EXPLICIT_TRY_REFLECTION_SET_ACCESSIBLE;
}
static int javaVersion() {
return JAVA_VERSION;
}
private static int javaVersion0() {
final int majorVersion;
if (isAndroid0()) {
majorVersion = 6;
} else {
majorVersion = majorVersionFromJavaSpecificationVersion();
}
logger.debug("Java version: {}", majorVersion);
return majorVersion;
}
// Package-private for testing only
static int majorVersionFromJavaSpecificationVersion() {
return majorVersion(SystemPropertyUtil.get("java.specification.version", "1.6"));
}
// Package-private for testing only
static int majorVersion(final String javaSpecVersion) {
final String[] components = javaSpecVersion.split("\\.");
final int[] version = new int[components.length];
for (int i = 0; i < components.length; i++) {
version[i] = Integer.parseInt(components[i]);
}
if (version[0] == 1) {
assert version[1] >= 6;
return version[1];
} else {
return version[0];
}
}
private PlatformDependent0() {
}
}
