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io.netty.util.internal.PlatformDependent0 Maven / Gradle / Ivy
This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* 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 java.util.concurrent.atomic.AtomicLong;
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;
private static final long BITS_MAX_DIRECT_MEMORY;
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,
// or that they haven't been removed by JEP 471.
// https://github.com/netty/netty/issues/1061
// https://www.mail-archive.com/[email protected] /msg00698.html
// https://openjdk.org/jeps/471
if (unsafe != null) {
final Unsafe finalUnsafe = unsafe;
final Object maybeException = AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Object run() {
try {
// Other methods like storeFence() and invokeCleaner() are tested for elsewhere.
Class cls = finalUnsafe.getClass();
cls.getDeclaredMethod(
"copyMemory", Object.class, long.class, Object.class, long.class, long.class);
if (javaVersion() > 23) {
cls.getDeclaredMethod("objectFieldOffset", Field.class);
cls.getDeclaredMethod("staticFieldOffset", Field.class);
cls.getDeclaredMethod("staticFieldBase", Field.class);
cls.getDeclaredMethod("arrayBaseOffset", Class.class);
cls.getDeclaredMethod("arrayIndexScale", Class.class);
cls.getDeclaredMethod("allocateMemory", long.class);
cls.getDeclaredMethod("reallocateMemory", long.class, long.class);
cls.getDeclaredMethod("freeMemory", long.class);
cls.getDeclaredMethod("setMemory", long.class, long.class, byte.class);
cls.getDeclaredMethod("setMemory", Object.class, long.class, long.class, byte.class);
cls.getDeclaredMethod("getBoolean", Object.class, long.class);
cls.getDeclaredMethod("getByte", long.class);
cls.getDeclaredMethod("getByte", Object.class, long.class);
cls.getDeclaredMethod("getInt", long.class);
cls.getDeclaredMethod("getInt", Object.class, long.class);
cls.getDeclaredMethod("getLong", long.class);
cls.getDeclaredMethod("getLong", Object.class, long.class);
cls.getDeclaredMethod("putByte", long.class, byte.class);
cls.getDeclaredMethod("putByte", Object.class, long.class, byte.class);
cls.getDeclaredMethod("putInt", long.class, int.class);
cls.getDeclaredMethod("putInt", Object.class, long.class, int.class);
cls.getDeclaredMethod("putLong", long.class, long.class);
cls.getDeclaredMethod("putLong", Object.class, long.class, long.class);
cls.getDeclaredMethod("addressSize");
}
if (javaVersion() >= 23) {
// The following tests the methods are usable.
// Will throw UnsupportedOperationException if unsafe memory access is denied:
long address = finalUnsafe.allocateMemory(8);
finalUnsafe.putLong(address, 42);
finalUnsafe.freeMemory(address);
}
return null;
} catch (UnsupportedOperationException e) {
return e;
} catch (NoSuchMethodException e) {
return e;
} catch (SecurityException e) {
return e;
}
}
});
if (maybeException == null) {
logger.debug("sun.misc.Unsafe base methods: all available");
} else {
// Unsafe.copyMemory(Object, long, Object, long, long) unavailable.
unsafe = null;
unsafeUnavailabilityCause = (Throwable) maybeException;
if (logger.isTraceEnabled()) {
logger.debug("sun.misc.Unsafe method unavailable:", unsafeUnavailabilityCause);
} else {
logger.debug("sun.misc.Unsafe method 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;
BITS_MAX_DIRECT_MEMORY = -1;
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;
// using a known type to avoid loading new classes
final AtomicLong maybeMaxMemory = new AtomicLong(-1);
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? "MAX_MEMORY" : "maxMemory";
// On Java9 and later we try to directly access the field as we can do this without
// adjust the accessible levels.
try {
Field maxMemoryField = bitsClass.getDeclaredField(fieldName);
if (maxMemoryField.getType() == long.class) {
long offset = UNSAFE.staticFieldOffset(maxMemoryField);
Object object = UNSAFE.staticFieldBase(maxMemoryField);
maybeMaxMemory.lazySet(UNSAFE.getLong(object, offset));
}
} catch (Throwable ignore) {
// ignore if can't access
}
fieldName = version >= 11? "UNALIGNED" : "unaligned";
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;
BITS_MAX_DIRECT_MEMORY = maybeMaxMemory.get() >= 0? maybeMaxMemory.get() : -1;
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() {
boolean noUnsafe = SystemPropertyUtil.getBoolean("io.netty.noUnsafe", false);
logger.debug("-Dio.netty.noUnsafe: {}", noUnsafe);
// See JDK 23 JEP 471 https://openjdk.org/jeps/471 and sun.misc.Unsafe.beforeMemoryAccess() on JDK 23+.
String unsafeMemoryAccess = SystemPropertyUtil.get("sun.misc.unsafe.memory.access", "");
if (!("allow".equals(unsafeMemoryAccess) || "".equals(unsafeMemoryAccess))) {
logger.debug("--sun-misc-unsafe-memory-access={}", unsafeMemoryAccess);
noUnsafe = true;
}
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.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;
}
/**
* Any value >= 0 should be considered as a valid max direct memory value.
*/
static long bitsMaxDirectMemory() {
return BITS_MAX_DIRECT_MEMORY;
}
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() {
}
}
