--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/sun/nio/ch/NativeObject.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,405 @@
+/*
+ * Copyright 2000-2002 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ */
+
+package sun.nio.ch; // Formerly in sun.misc
+
+import java.nio.ByteOrder;
+import sun.misc.Unsafe;
+
+
+// ## In the fullness of time, this class will be eliminated
+
+/**
+ * Proxies for objects that reside in native memory.
+ */
+
+class NativeObject { // package-private
+
+ protected static final Unsafe unsafe = Unsafe.getUnsafe();
+
+ // Native allocation address;
+ // may be smaller than the base address due to page-size rounding
+ //
+ protected long allocationAddress;
+
+ // Native base address
+ //
+ private final long address;
+
+ /**
+ * Creates a new native object that is based at the given native address.
+ */
+ NativeObject(long address) {
+ this.allocationAddress = address;
+ this.address = address;
+ }
+
+ /**
+ * Creates a new native object allocated at the given native address but
+ * whose base is at the additional offset.
+ */
+ NativeObject(long address, long offset) {
+ this.allocationAddress = address;
+ this.address = address + offset;
+ }
+
+ // Invoked only by AllocatedNativeObject
+ //
+ protected NativeObject(int size, boolean pageAligned) {
+ if (!pageAligned) {
+ this.allocationAddress = unsafe.allocateMemory(size);
+ this.address = this.allocationAddress;
+ } else {
+ int ps = pageSize();
+ long a = unsafe.allocateMemory(size + ps);
+ this.allocationAddress = a;
+ this.address = a + ps - (a & (ps - 1));
+ }
+ }
+
+ /**
+ * Returns the native base address of this native object.
+ *
+ * @return The native base address
+ */
+ long address() {
+ return address;
+ }
+
+ long allocationAddress() {
+ return allocationAddress;
+ }
+
+ /**
+ * Creates a new native object starting at the given offset from the base
+ * of this native object.
+ *
+ * @param offset
+ * The offset from the base of this native object that is to be
+ * the base of the new native object
+ *
+ * @return The newly created native object
+ */
+ NativeObject subObject(int offset) {
+ return new NativeObject(offset + address);
+ }
+
+ /**
+ * Reads an address from this native object at the given offset and
+ * constructs a native object using that address.
+ *
+ * @param offset
+ * The offset of the address to be read. Note that the size of an
+ * address is implementation-dependent.
+ *
+ * @return The native object created using the address read from the
+ * given offset
+ */
+ NativeObject getObject(int offset) {
+ long newAddress = 0L;
+ switch (addressSize()) {
+ case 8:
+ newAddress = unsafe.getLong(offset + address);
+ break;
+ case 4:
+ newAddress = unsafe.getInt(offset + address) & 0x00000000FFFFFFFF;
+ break;
+ default:
+ throw new InternalError("Address size not supported");
+ }
+
+ return new NativeObject(newAddress);
+ }
+
+ /**
+ * Writes the base address of the given native object at the given offset
+ * of this native object.
+ *
+ * @param offset
+ * The offset at which the address is to be written. Note that the
+ * size of an address is implementation-dependent.
+ *
+ * @param ob
+ * The native object whose address is to be written
+ */
+ void putObject(int offset, NativeObject ob) {
+ switch (addressSize()) {
+ case 8:
+ putLong(offset, ob.address);
+ break;
+ case 4:
+ putInt(offset, (int)(ob.address & 0x00000000FFFFFFFF));
+ break;
+ default:
+ throw new InternalError("Address size not supported");
+ }
+ }
+
+
+ /* -- Value accessors: No range checking! -- */
+
+ /**
+ * Reads a byte starting at the given offset from base of this native
+ * object.
+ *
+ * @param offset
+ * The offset at which to read the byte
+ *
+ * @return The byte value read
+ */
+ final byte getByte(int offset) {
+ return unsafe.getByte(offset + address);
+ }
+
+ /**
+ * Writes a byte at the specified offset from this native object's
+ * base address.
+ *
+ * @param offset
+ * The offset at which to write the byte
+ *
+ * @param value
+ * The byte value to be written
+ */
+ final void putByte(int offset, byte value) {
+ unsafe.putByte(offset + address, value);
+ }
+
+ /**
+ * Reads a short starting at the given offset from base of this native
+ * object.
+ *
+ * @param offset
+ * The offset at which to read the short
+ *
+ * @return The short value read
+ */
+ final short getShort(int offset) {
+ return unsafe.getShort(offset + address);
+ }
+
+ /**
+ * Writes a short at the specified offset from this native object's
+ * base address.
+ *
+ * @param offset
+ * The offset at which to write the short
+ *
+ * @param value
+ * The short value to be written
+ */
+ final void putShort(int offset, short value) {
+ unsafe.putShort(offset + address, value);
+ }
+
+ /**
+ * Reads a char starting at the given offset from base of this native
+ * object.
+ *
+ * @param offset
+ * The offset at which to read the char
+ *
+ * @return The char value read
+ */
+ final char getChar(int offset) {
+ return unsafe.getChar(offset + address);
+ }
+
+ /**
+ * Writes a char at the specified offset from this native object's
+ * base address.
+ *
+ * @param offset
+ * The offset at which to write the char
+ *
+ * @param value
+ * The char value to be written
+ */
+ final void putChar(int offset, char value) {
+ unsafe.putChar(offset + address, value);
+ }
+
+ /**
+ * Reads an int starting at the given offset from base of this native
+ * object.
+ *
+ * @param offset
+ * The offset at which to read the int
+ *
+ * @return The int value read
+ */
+ final int getInt(int offset) {
+ return unsafe.getInt(offset + address);
+ }
+
+ /**
+ * Writes an int at the specified offset from this native object's
+ * base address.
+ *
+ * @param offset
+ * The offset at which to write the int
+ *
+ * @param value
+ * The int value to be written
+ */
+ final void putInt(int offset, int value) {
+ unsafe.putInt(offset + address, value);
+ }
+
+ /**
+ * Reads a long starting at the given offset from base of this native
+ * object.
+ *
+ * @param offset
+ * The offset at which to read the long
+ *
+ * @return The long value read
+ */
+ final long getLong(int offset) {
+ return unsafe.getLong(offset + address);
+ }
+
+ /**
+ * Writes a long at the specified offset from this native object's
+ * base address.
+ *
+ * @param offset
+ * The offset at which to write the long
+ *
+ * @param value
+ * The long value to be written
+ */
+ final void putLong(int offset, long value) {
+ unsafe.putLong(offset + address, value);
+ }
+
+ /**
+ * Reads a float starting at the given offset from base of this native
+ * object.
+ *
+ * @param offset
+ * The offset at which to read the float
+ *
+ * @return The float value read
+ */
+ final float getFloat(int offset) {
+ return unsafe.getFloat(offset + address);
+ }
+
+ /**
+ * Writes a float at the specified offset from this native object's
+ * base address.
+ *
+ * @param offset
+ * The offset at which to write the float
+ *
+ * @param value
+ * The float value to be written
+ */
+ final void putFloat(int offset, float value) {
+ unsafe.putFloat(offset + address, value);
+ }
+
+ /**
+ * Reads a double starting at the given offset from base of this native
+ * object.
+ *
+ * @param offset
+ * The offset at which to read the double
+ *
+ * @return The double value read
+ */
+ final double getDouble(int offset) {
+ return unsafe.getDouble(offset + address);
+ }
+
+ /**
+ * Writes a double at the specified offset from this native object's
+ * base address.
+ *
+ * @param offset
+ * The offset at which to write the double
+ *
+ * @param value
+ * The double value to be written
+ */
+ final void putDouble(int offset, double value) {
+ unsafe.putDouble(offset + address, value);
+ }
+
+ /**
+ * Returns the native architecture's address size in bytes.
+ *
+ * @return The address size of the native architecture
+ */
+ static int addressSize() {
+ return unsafe.addressSize();
+ }
+
+ // Cache for byte order
+ private static ByteOrder byteOrder = null;
+
+ /**
+ * Returns the byte order of the underlying hardware.
+ *
+ * @return An instance of {@link java.nio.ByteOrder}
+ */
+ static ByteOrder byteOrder() {
+ if (byteOrder != null)
+ return byteOrder;
+ long a = unsafe.allocateMemory(8);
+ try {
+ unsafe.putLong(a, 0x0102030405060708L);
+ byte b = unsafe.getByte(a);
+ switch (b) {
+ case 0x01: byteOrder = ByteOrder.BIG_ENDIAN; break;
+ case 0x08: byteOrder = ByteOrder.LITTLE_ENDIAN; break;
+ default:
+ assert false;
+ }
+ } finally {
+ unsafe.freeMemory(a);
+ }
+ return byteOrder;
+ }
+
+ // Cache for page size
+ private static int pageSize = -1;
+
+ /**
+ * Returns the page size of the underlying hardware.
+ *
+ * @return The page size, in bytes
+ */
+ static int pageSize() {
+ if (pageSize == -1)
+ pageSize = unsafe.pageSize();
+ return pageSize;
+ }
+
+}