Index: third_party/protobuf/java/core/src/main/java/com/google/protobuf/UnsafeUtil.java |
diff --git a/third_party/protobuf/java/core/src/main/java/com/google/protobuf/UnsafeUtil.java b/third_party/protobuf/java/core/src/main/java/com/google/protobuf/UnsafeUtil.java |
new file mode 100644 |
index 0000000000000000000000000000000000000000..5f7bafd602bea27a1032a45f6814d66096b5d8e2 |
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+++ b/third_party/protobuf/java/core/src/main/java/com/google/protobuf/UnsafeUtil.java |
@@ -0,0 +1,295 @@ |
+// Protocol Buffers - Google's data interchange format |
+// Copyright 2008 Google Inc. All rights reserved. |
+// https://developers.google.com/protocol-buffers/ |
+// |
+// Redistribution and use in source and binary forms, with or without |
+// modification, are permitted provided that the following conditions are |
+// met: |
+// |
+// * Redistributions of source code must retain the above copyright |
+// notice, this list of conditions and the following disclaimer. |
+// * Redistributions in binary form must reproduce the above |
+// copyright notice, this list of conditions and the following disclaimer |
+// in the documentation and/or other materials provided with the |
+// distribution. |
+// * Neither the name of Google Inc. nor the names of its |
+// contributors may be used to endorse or promote products derived from |
+// this software without specific prior written permission. |
+// |
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
+ |
+package com.google.protobuf; |
+ |
+import java.lang.reflect.Field; |
+import java.nio.Buffer; |
+import java.nio.ByteBuffer; |
+import java.security.AccessController; |
+import java.security.PrivilegedExceptionAction; |
+import sun.misc.Unsafe; |
+ |
+/** Utility class for working with unsafe operations. */ |
+// TODO(nathanmittler): Add support for Android Memory/MemoryBlock |
+final class UnsafeUtil { |
+ private static final sun.misc.Unsafe UNSAFE = getUnsafe(); |
+ private static final boolean HAS_UNSAFE_BYTEBUFFER_OPERATIONS = |
+ supportsUnsafeByteBufferOperations(); |
+ private static final boolean HAS_UNSAFE_ARRAY_OPERATIONS = supportsUnsafeArrayOperations(); |
+ private static final long ARRAY_BASE_OFFSET = byteArrayBaseOffset(); |
+ private static final long BUFFER_ADDRESS_OFFSET = fieldOffset(field(Buffer.class, "address")); |
+ |
+ private UnsafeUtil() {} |
+ |
+ static boolean hasUnsafeArrayOperations() { |
+ return HAS_UNSAFE_ARRAY_OPERATIONS; |
+ } |
+ |
+ static boolean hasUnsafeByteBufferOperations() { |
+ return HAS_UNSAFE_BYTEBUFFER_OPERATIONS; |
+ } |
+ |
+ static Object allocateInstance(Class<?> clazz) { |
+ try { |
+ return UNSAFE.allocateInstance(clazz); |
+ } catch (InstantiationException e) { |
+ throw new RuntimeException(e); |
+ } |
+ } |
+ |
+ static long objectFieldOffset(Field field) { |
+ return UNSAFE.objectFieldOffset(field); |
+ } |
+ |
+ static long getArrayBaseOffset() { |
+ return ARRAY_BASE_OFFSET; |
+ } |
+ |
+ static byte getByte(Object target, long offset) { |
+ return UNSAFE.getByte(target, offset); |
+ } |
+ |
+ static void putByte(Object target, long offset, byte value) { |
+ UNSAFE.putByte(target, offset, value); |
+ } |
+ |
+ static int getInt(Object target, long offset) { |
+ return UNSAFE.getInt(target, offset); |
+ } |
+ |
+ static void putInt(Object target, long offset, int value) { |
+ UNSAFE.putInt(target, offset, value); |
+ } |
+ |
+ static long getLong(Object target, long offset) { |
+ return UNSAFE.getLong(target, offset); |
+ } |
+ |
+ static void putLong(Object target, long offset, long value) { |
+ UNSAFE.putLong(target, offset, value); |
+ } |
+ |
+ static boolean getBoolean(Object target, long offset) { |
+ return UNSAFE.getBoolean(target, offset); |
+ } |
+ |
+ static void putBoolean(Object target, long offset, boolean value) { |
+ UNSAFE.putBoolean(target, offset, value); |
+ } |
+ |
+ static float getFloat(Object target, long offset) { |
+ return UNSAFE.getFloat(target, offset); |
+ } |
+ |
+ static void putFloat(Object target, long offset, float value) { |
+ UNSAFE.putFloat(target, offset, value); |
+ } |
+ |
+ static double getDouble(Object target, long offset) { |
+ return UNSAFE.getDouble(target, offset); |
+ } |
+ |
+ static void putDouble(Object target, long offset, double value) { |
+ UNSAFE.putDouble(target, offset, value); |
+ } |
+ |
+ static Object getObject(Object target, long offset) { |
+ return UNSAFE.getObject(target, offset); |
+ } |
+ |
+ static void putObject(Object target, long offset, Object value) { |
+ UNSAFE.putObject(target, offset, value); |
+ } |
+ |
+ static void copyMemory( |
+ Object src, long srcOffset, Object target, long targetOffset, long length) { |
+ UNSAFE.copyMemory(src, srcOffset, target, targetOffset, length); |
+ } |
+ |
+ static byte getByte(long address) { |
+ return UNSAFE.getByte(address); |
+ } |
+ |
+ static void putByte(long address, byte value) { |
+ UNSAFE.putByte(address, value); |
+ } |
+ |
+ static int getInt(long address) { |
+ return UNSAFE.getInt(address); |
+ } |
+ |
+ static void putInt(long address, int value) { |
+ UNSAFE.putInt(address, value); |
+ } |
+ |
+ static long getLong(long address) { |
+ return UNSAFE.getLong(address); |
+ } |
+ |
+ static void putLong(long address, long value) { |
+ UNSAFE.putLong(address, value); |
+ } |
+ |
+ static void copyMemory(long srcAddress, long targetAddress, long length) { |
+ UNSAFE.copyMemory(srcAddress, targetAddress, length); |
+ } |
+ |
+ static void setMemory(long address, long numBytes, byte value) { |
+ UNSAFE.setMemory(address, numBytes, value); |
+ } |
+ |
+ /** |
+ * Gets the offset of the {@code address} field of the given direct {@link ByteBuffer}. |
+ */ |
+ static long addressOffset(ByteBuffer buffer) { |
+ return UNSAFE.getLong(buffer, BUFFER_ADDRESS_OFFSET); |
+ } |
+ |
+ /** |
+ * Gets the {@code sun.misc.Unsafe} instance, or {@code null} if not available on this platform. |
+ */ |
+ private static sun.misc.Unsafe getUnsafe() { |
+ sun.misc.Unsafe unsafe = null; |
+ try { |
+ unsafe = |
+ AccessController.doPrivileged( |
+ new PrivilegedExceptionAction<Unsafe>() { |
+ @Override |
+ public sun.misc.Unsafe run() throws Exception { |
+ Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class; |
+ |
+ for (Field f : k.getDeclaredFields()) { |
+ f.setAccessible(true); |
+ Object x = f.get(null); |
+ if (k.isInstance(x)) { |
+ return k.cast(x); |
+ } |
+ } |
+ // The sun.misc.Unsafe field does not exist. |
+ return null; |
+ } |
+ }); |
+ } catch (Throwable e) { |
+ // Catching Throwable here due to the fact that Google AppEngine raises NoClassDefFoundError |
+ // for Unsafe. |
+ } |
+ return unsafe; |
+ } |
+ |
+ /** Indicates whether or not unsafe array operations are supported on this platform. */ |
+ private static boolean supportsUnsafeArrayOperations() { |
+ boolean supported = false; |
+ if (UNSAFE != null) { |
+ try { |
+ Class<?> clazz = UNSAFE.getClass(); |
+ clazz.getMethod("objectFieldOffset", Field.class); |
+ clazz.getMethod("allocateInstance", Class.class); |
+ clazz.getMethod("arrayBaseOffset", Class.class); |
+ 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("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("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); |
+ clazz.getMethod("getObject", Object.class, long.class); |
+ clazz.getMethod("putObject", Object.class, long.class, Object.class); |
+ clazz.getMethod( |
+ "copyMemory", Object.class, long.class, Object.class, long.class, long.class); |
+ supported = true; |
+ } catch (Throwable e) { |
+ // Do nothing. |
+ } |
+ } |
+ return supported; |
+ } |
+ |
+ private static boolean supportsUnsafeByteBufferOperations() { |
+ boolean supported = false; |
+ if (UNSAFE != null) { |
+ try { |
+ Class<?> clazz = UNSAFE.getClass(); |
+ // Methods for getting direct buffer address. |
+ clazz.getMethod("objectFieldOffset", Field.class); |
+ clazz.getMethod("getLong", Object.class, long.class); |
+ |
+ 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("setMemory", long.class, long.class, byte.class); |
+ clazz.getMethod("copyMemory", long.class, long.class, long.class); |
+ supported = true; |
+ } catch (Throwable e) { |
+ // Do nothing. |
+ } |
+ } |
+ return supported; |
+ } |
+ |
+ /** |
+ * Get the base offset for byte arrays, or {@code -1} if {@code sun.misc.Unsafe} is not available. |
+ */ |
+ private static int byteArrayBaseOffset() { |
+ return HAS_UNSAFE_ARRAY_OPERATIONS ? UNSAFE.arrayBaseOffset(byte[].class) : -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 || UNSAFE == null ? -1 : UNSAFE.objectFieldOffset(field); |
+ } |
+ |
+ /** |
+ * Gets the field with the given name within the class, or {@code null} if not found. If found, |
+ * the field is made accessible. |
+ */ |
+ private static Field field(Class<?> clazz, String fieldName) { |
+ Field field; |
+ try { |
+ field = clazz.getDeclaredField(fieldName); |
+ field.setAccessible(true); |
+ } catch (Throwable t) { |
+ // Failed to access the fields. |
+ field = null; |
+ } |
+ return field; |
+ } |
+} |