diff options
Diffstat (limited to 'java/core/src/main/java/com/google/protobuf/UnsafeUtil.java')
| -rw-r--r-- | java/core/src/main/java/com/google/protobuf/UnsafeUtil.java | 401 |
1 files changed, 308 insertions, 93 deletions
diff --git a/java/core/src/main/java/com/google/protobuf/UnsafeUtil.java b/java/core/src/main/java/com/google/protobuf/UnsafeUtil.java index 5f7bafd6..ca80d946 100644 --- a/java/core/src/main/java/com/google/protobuf/UnsafeUtil.java +++ b/java/core/src/main/java/com/google/protobuf/UnsafeUtil.java @@ -33,19 +33,23 @@ package com.google.protobuf; import java.lang.reflect.Field; import java.nio.Buffer; import java.nio.ByteBuffer; +import java.nio.ByteOrder; import java.security.AccessController; import java.security.PrivilegedExceptionAction; -import sun.misc.Unsafe; +import java.util.logging.Level; +import java.util.logging.Logger; /** Utility class for working with unsafe operations. */ -// TODO(nathanmittler): Add support for Android Memory/MemoryBlock final class UnsafeUtil { + private static final Logger logger = Logger.getLogger(UnsafeUtil.class.getName()); private static final sun.misc.Unsafe UNSAFE = getUnsafe(); + private static final MemoryAccessor MEMORY_ACCESSOR = getMemoryAccessor(); private static final boolean HAS_UNSAFE_BYTEBUFFER_OPERATIONS = supportsUnsafeByteBufferOperations(); private static final boolean HAS_UNSAFE_ARRAY_OPERATIONS = supportsUnsafeArrayOperations(); + private static final boolean HAS_UNSAFE_COPY_MEMORY = supportsUnsafeCopyMemory(); private static final long ARRAY_BASE_OFFSET = byteArrayBaseOffset(); - private static final long BUFFER_ADDRESS_OFFSET = fieldOffset(field(Buffer.class, "address")); + private static final long BUFFER_ADDRESS_OFFSET = fieldOffset(bufferAddressField()); private UnsafeUtil() {} @@ -53,20 +57,16 @@ final class UnsafeUtil { return HAS_UNSAFE_ARRAY_OPERATIONS; } - static boolean hasUnsafeByteBufferOperations() { - return HAS_UNSAFE_BYTEBUFFER_OPERATIONS; + static boolean hasUnsafeCopyMemory() { + return HAS_UNSAFE_COPY_MEMORY; } - static Object allocateInstance(Class<?> clazz) { - try { - return UNSAFE.allocateInstance(clazz); - } catch (InstantiationException e) { - throw new RuntimeException(e); - } + static boolean hasUnsafeByteBufferOperations() { + return HAS_UNSAFE_BYTEBUFFER_OPERATIONS; } static long objectFieldOffset(Field field) { - return UNSAFE.objectFieldOffset(field); + return MEMORY_ACCESSOR.objectFieldOffset(field); } static long getArrayBaseOffset() { @@ -74,103 +74,103 @@ final class UnsafeUtil { } static byte getByte(Object target, long offset) { - return UNSAFE.getByte(target, offset); + return MEMORY_ACCESSOR.getByte(target, offset); } static void putByte(Object target, long offset, byte value) { - UNSAFE.putByte(target, offset, value); + MEMORY_ACCESSOR.putByte(target, offset, value); } static int getInt(Object target, long offset) { - return UNSAFE.getInt(target, offset); + return MEMORY_ACCESSOR.getInt(target, offset); } static void putInt(Object target, long offset, int value) { - UNSAFE.putInt(target, offset, value); + MEMORY_ACCESSOR.putInt(target, offset, value); } static long getLong(Object target, long offset) { - return UNSAFE.getLong(target, offset); + return MEMORY_ACCESSOR.getLong(target, offset); } static void putLong(Object target, long offset, long value) { - UNSAFE.putLong(target, offset, value); + MEMORY_ACCESSOR.putLong(target, offset, value); } static boolean getBoolean(Object target, long offset) { - return UNSAFE.getBoolean(target, offset); + return MEMORY_ACCESSOR.getBoolean(target, offset); } static void putBoolean(Object target, long offset, boolean value) { - UNSAFE.putBoolean(target, offset, value); + MEMORY_ACCESSOR.putBoolean(target, offset, value); } static float getFloat(Object target, long offset) { - return UNSAFE.getFloat(target, offset); + return MEMORY_ACCESSOR.getFloat(target, offset); } static void putFloat(Object target, long offset, float value) { - UNSAFE.putFloat(target, offset, value); + MEMORY_ACCESSOR.putFloat(target, offset, value); } static double getDouble(Object target, long offset) { - return UNSAFE.getDouble(target, offset); + return MEMORY_ACCESSOR.getDouble(target, offset); } static void putDouble(Object target, long offset, double value) { - UNSAFE.putDouble(target, offset, value); + MEMORY_ACCESSOR.putDouble(target, offset, value); } static Object getObject(Object target, long offset) { - return UNSAFE.getObject(target, offset); + return MEMORY_ACCESSOR.getObject(target, offset); } static void putObject(Object target, long offset, Object value) { - UNSAFE.putObject(target, offset, value); + MEMORY_ACCESSOR.putObject(target, offset, value); } static void copyMemory( Object src, long srcOffset, Object target, long targetOffset, long length) { - UNSAFE.copyMemory(src, srcOffset, target, targetOffset, length); + MEMORY_ACCESSOR.copyMemory(src, srcOffset, target, targetOffset, length); } static byte getByte(long address) { - return UNSAFE.getByte(address); + return MEMORY_ACCESSOR.getByte(address); } static void putByte(long address, byte value) { - UNSAFE.putByte(address, value); + MEMORY_ACCESSOR.putByte(address, value); } static int getInt(long address) { - return UNSAFE.getInt(address); + return MEMORY_ACCESSOR.getInt(address); } static void putInt(long address, int value) { - UNSAFE.putInt(address, value); + MEMORY_ACCESSOR.putInt(address, value); } static long getLong(long address) { - return UNSAFE.getLong(address); + return MEMORY_ACCESSOR.getLong(address); } static void putLong(long address, long value) { - UNSAFE.putLong(address, value); + MEMORY_ACCESSOR.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); + MEMORY_ACCESSOR.copyMemory(srcAddress, targetAddress, length); } /** * 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); + return MEMORY_ACCESSOR.getLong(buffer, BUFFER_ADDRESS_OFFSET); + } + + static Object getStaticObject(Field field) { + return MEMORY_ACCESSOR.getStaticObject(field); } /** @@ -181,7 +181,7 @@ final class UnsafeUtil { try { unsafe = AccessController.doPrivileged( - new PrivilegedExceptionAction<Unsafe>() { + new PrivilegedExceptionAction<sun.misc.Unsafe>() { @Override public sun.misc.Unsafe run() throws Exception { Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class; @@ -204,69 +204,114 @@ final class UnsafeUtil { return unsafe; } + /** Get a {@link MemoryAccessor} appropriate for the platform, or null if not supported. */ + private static MemoryAccessor getMemoryAccessor() { + if (UNSAFE == null) { + return null; + } + return new JvmMemoryAccessor(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; + if (UNSAFE == null) { + return false; + } + try { + Class<?> clazz = UNSAFE.getClass(); + clazz.getMethod("objectFieldOffset", Field.class); + clazz.getMethod("arrayBaseOffset", 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); + 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) { + logger.log( + Level.WARNING, + "platform method missing - proto runtime falling back to safer methods: " + e); + } + return false; + } + + /** + * Indicates whether or not unsafe copyMemory(object, long, object, long, long) operations are + * supported on this platform. + */ + private static boolean supportsUnsafeCopyMemory() { + if (UNSAFE == null) { + return false; + } + try { + Class<?> clazz = UNSAFE.getClass(); + clazz.getMethod("copyMemory", Object.class, long.class, Object.class, long.class, long.class); + + return true; + } catch (Throwable e) { + logger.log( + Level.WARNING, + "copyMemory is missing from platform - proto runtime falling back to safer methods."); + } + return false; } 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; + 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); + + 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); + return true; + } catch (Throwable e) { + logger.log( + Level.WARNING, + "platform method missing - proto runtime falling back to safer methods: " + e); + } + return false; + } + + + @SuppressWarnings("unchecked") + private static <T> Class<T> getClassForName(String name) { + try { + return (Class<T>) Class.forName(name); + } catch (Throwable e) { + return null; + } + } + + /** Finds the address field within a direct {@link Buffer}. */ + private static Field bufferAddressField() { + return field(Buffer.class, "address"); } /** * 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; + return HAS_UNSAFE_ARRAY_OPERATIONS ? MEMORY_ACCESSOR.arrayBaseOffset(byte[].class) : -1; } /** @@ -274,7 +319,7 @@ final class UnsafeUtil { * available. */ private static long fieldOffset(Field field) { - return field == null || UNSAFE == null ? -1 : UNSAFE.objectFieldOffset(field); + return field == null || MEMORY_ACCESSOR == null ? -1 : MEMORY_ACCESSOR.objectFieldOffset(field); } /** @@ -292,4 +337,174 @@ final class UnsafeUtil { } 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 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); + } + + public final int arrayBaseOffset(Class<?> clazz) { + return unsafe.arrayBaseOffset(clazz); + } + + 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 srcAddress, long targetAddress, long length); + + public abstract void copyMemory( + Object src, long srcOffset, Object target, long targetOffset, long length); + + public abstract Object getStaticObject(Field field); + } + + private static final class JvmMemoryAccessor extends MemoryAccessor { + + JvmMemoryAccessor(sun.misc.Unsafe unsafe) { + super(unsafe); + } + + @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 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 void copyMemory( + Object src, long srcOffset, Object target, long targetOffset, long length) { + unsafe.copyMemory(src, srcOffset, target, targetOffset, length); + } + + @Override + public void copyMemory(long srcAddress, long targetAddress, long length) { + unsafe.copyMemory(srcAddress, targetAddress, length); + } + + @Override + public Object getStaticObject(Field field) { + return getObject(unsafe.staticFieldBase(field), unsafe.staticFieldOffset(field)); + } + } + } |