o at the given offset, or (if o is
+ * null) from the memory address whose numerical value is the
+ * given offset.
+ *
+ * The specification of this method is the same as {@link
+ * #getLong(Object, long)} except that the offset does not need to
+ * have been obtained from {@link #objectFieldOffset} on the
+ * {@link java.lang.reflect.Field} of some Java field. The value
+ * in memory is raw data, and need not correspond to any Java
+ * variable. Unless o is null, the value accessed
+ * must be entirely within the allocated object. The endianness
+ * of the value in memory is the endianness of the native platform.
+ *
+ *
The read will be atomic with respect to the largest power + * of two that divides the GCD of the offset and the storage size. + * For example, getLongUnaligned will make atomic reads of 2-, 4-, + * or 8-byte storage units if the offset is zero mod 2, 4, or 8, + * respectively. There are no other guarantees of atomicity. + *
+ * 8-byte atomicity is only guaranteed on platforms on which + * support atomic accesses to longs. + * + * @param o Java heap object in which the value resides, if any, else + * null + * @param offset The offset in bytes from the start of the object + * @return the value fetched from the indicated object + * @throws RuntimeException No defined exceptions are thrown, not even + * {@link NullPointerException} + * @since 1.9 + */ + public final long getLongUnaligned(Object o, long offset) { + if ((offset & 7) == 0) { + return getLong(o, offset); + } else if ((offset & 3) == 0) { + return makeLong(getInt(o, offset), + getInt(o, offset + 4)); + } else if ((offset & 1) == 0) { + return makeLong(getShort(o, offset), + getShort(o, offset + 2), + getShort(o, offset + 4), + getShort(o, offset + 6)); + } else { + return makeLong(getByte(o, offset), + getByte(o, offset + 1), + getByte(o, offset + 2), + getByte(o, offset + 3), + getByte(o, offset + 4), + getByte(o, offset + 5), + getByte(o, offset + 6), + getByte(o, offset + 7)); + } + } + /** + * As {@link #getLongUnaligned(Object, long)} but with an + * additional argument which specifies the endianness of the value + * as stored in memory. + * + * @param o Java heap object in which the variable resides + * @param offset The offset in bytes from the start of the object + * @param bigEndian The endianness of the value + * @return the value fetched from the indicated object + * @since 1.9 + */ + public final long getLongUnaligned(Object o, long offset, boolean bigEndian) { + return convEndian(bigEndian, getLongUnaligned(o, offset)); + } + + /** @see #getLongUnaligned(Object, long) */ + public final int getIntUnaligned(Object o, long offset) { + if ((offset & 3) == 0) { + return getInt(o, offset); + } else if ((offset & 1) == 0) { + return makeInt(getShort(o, offset), + getShort(o, offset + 2)); + } else { + return makeInt(getByte(o, offset), + getByte(o, offset + 1), + getByte(o, offset + 2), + getByte(o, offset + 3)); + } + } + /** @see #getLongUnaligned(Object, long, boolean) */ + public final int getIntUnaligned(Object o, long offset, boolean bigEndian) { + return convEndian(bigEndian, getIntUnaligned(o, offset)); + } + + /** @see #getLongUnaligned(Object, long) */ + public final short getShortUnaligned(Object o, long offset) { + if ((offset & 1) == 0) { + return getShort(o, offset); + } else { + return makeShort(getByte(o, offset), + getByte(o, offset + 1)); + } + } + /** @see #getLongUnaligned(Object, long, boolean) */ + public final short getShortUnaligned(Object o, long offset, boolean bigEndian) { + return convEndian(bigEndian, getShortUnaligned(o, offset)); + } + + /** @see #getLongUnaligned(Object, long) */ + public final char getCharUnaligned(Object o, long offset) { + return (char)getShortUnaligned(o, offset); + } + /** @see #getLongUnaligned(Object, long, boolean) */ + public final char getCharUnaligned(Object o, long offset, boolean bigEndian) { + return convEndian(bigEndian, getCharUnaligned(o, offset)); + } + + /** + * Stores a value at some byte offset into a given Java object. + *
+ * The specification of this method is the same as {@link + * #getLong(Object, long)} except that the offset does not need to + * have been obtained from {@link #objectFieldOffset} on the + * {@link java.lang.reflect.Field} of some Java field. The value + * in memory is raw data, and need not correspond to any Java + * variable. The endianness of the value in memory is the + * endianness of the native platform. + *
+ * The write will be atomic with respect to the largest power of + * two that divides the GCD of the offset and the storage size. + * For example, putLongUnaligned will make atomic writes of 2-, 4-, + * or 8-byte storage units if the offset is zero mod 2, 4, or 8, + * respectively. There are no other guarantees of atomicity. + *
+ * 8-byte atomicity is only guaranteed on platforms on which + * support atomic accesses to longs. + *
+ * + * @param o Java heap object in which the value resides, if any, else + * null + * @param offset The offset in bytes from the start of the object + * @param x the value to store + * @throws RuntimeException No defined exceptions are thrown, not even + * {@link NullPointerException} + * @since 1.9 + */ + public final void putLongUnaligned(Object o, long offset, long x) { + if ((offset & 7) == 0) { + putLong(o, offset, x); + } else if ((offset & 3) == 0) { + putLongParts(o, offset, + (int)(x >> 0), + (int)(x >>> 32)); + } else if ((offset & 1) == 0) { + putLongParts(o, offset, + (short)(x >>> 0), + (short)(x >>> 16), + (short)(x >>> 32), + (short)(x >>> 48)); + } else { + putLongParts(o, offset, + (byte)(x >>> 0), + (byte)(x >>> 8), + (byte)(x >>> 16), + (byte)(x >>> 24), + (byte)(x >>> 32), + (byte)(x >>> 40), + (byte)(x >>> 48), + (byte)(x >>> 56)); + } + } + /** + * As {@link #putLongUnaligned(Object, long, long)} but with an additional + * argument which specifies the endianness of the value as stored in memory. + * @param o Java heap object in which the value resides + * @param offset The offset in bytes from the start of the object + * @param x the value to store + * @param bigEndian The endianness of the value + * @throws RuntimeException No defined exceptions are thrown, not even + * {@link NullPointerException} + * @since 1.9 + */ + public final void putLongUnaligned(Object o, long offset, long x, boolean bigEndian) { + putLongUnaligned(o, offset, convEndian(bigEndian, x)); + } + + /** @see #putLongUnaligned(Object, long, long) */ + public final void putIntUnaligned(Object o, long offset, int x) { + if ((offset & 3) == 0) { + putInt(o, offset, x); + } else if ((offset & 1) == 0) { + putIntParts(o, offset, + (short)(x >> 0), + (short)(x >>> 16)); + } else { + putIntParts(o, offset, + (byte)(x >>> 0), + (byte)(x >>> 8), + (byte)(x >>> 16), + (byte)(x >>> 24)); + } + } + /** @see #putLongUnaligned(Object, long, long, boolean) */ + public final void putIntUnaligned(Object o, long offset, int x, boolean bigEndian) { + putIntUnaligned(o, offset, convEndian(bigEndian, x)); + } + + /** @see #putLongUnaligned(Object, long, long) */ + public final void putShortUnaligned(Object o, long offset, short x) { + if ((offset & 1) == 0) { + putShort(o, offset, x); + } else { + putShortParts(o, offset, + (byte)(x >>> 0), + (byte)(x >>> 8)); + } + } + /** @see #putLongUnaligned(Object, long, long, boolean) */ + public final void putShortUnaligned(Object o, long offset, short x, boolean bigEndian) { + putShortUnaligned(o, offset, convEndian(bigEndian, x)); + } + + /** @see #putLongUnaligned(Object, long, long) */ + public final void putCharUnaligned(Object o, long offset, char x) { + putShortUnaligned(o, offset, (short)x); + } + /** @see #putLongUnaligned(Object, long, long, boolean) */ + public final void putCharUnaligned(Object o, long offset, char x, boolean bigEndian) { + putCharUnaligned(o, offset, convEndian(bigEndian, x)); + } + + // JVM interface methods + private native boolean unalignedAccess0(); + private native boolean isBigEndian0(); + + // BE is true iff the native endianness of this platform is big. + private static final boolean BE = theUnsafe.isBigEndian0(); + + // unalignedAccess is true iff this platform can perform unaligned accesses. + private static final boolean unalignedAccess = theUnsafe.unalignedAccess0(); + + private static int pickPos(int top, int pos) { return BE ? top - pos : pos; } + + // These methods construct integers from bytes. The byte ordering + // is the native endianness of this platform. + private static long makeLong(byte i0, byte i1, byte i2, byte i3, byte i4, byte i5, byte i6, byte i7) { + return ((toUnsignedLong(i0) << pickPos(56, 0)) + | (toUnsignedLong(i1) << pickPos(56, 8)) + | (toUnsignedLong(i2) << pickPos(56, 16)) + | (toUnsignedLong(i3) << pickPos(56, 24)) + | (toUnsignedLong(i4) << pickPos(56, 32)) + | (toUnsignedLong(i5) << pickPos(56, 40)) + | (toUnsignedLong(i6) << pickPos(56, 48)) + | (toUnsignedLong(i7) << pickPos(56, 56))); + } + private static long makeLong(short i0, short i1, short i2, short i3) { + return ((toUnsignedLong(i0) << pickPos(48, 0)) + | (toUnsignedLong(i1) << pickPos(48, 16)) + | (toUnsignedLong(i2) << pickPos(48, 32)) + | (toUnsignedLong(i3) << pickPos(48, 48))); + } + private static long makeLong(int i0, int i1) { + return (toUnsignedLong(i0) << pickPos(32, 0)) + | (toUnsignedLong(i1) << pickPos(32, 32)); + } + private static int makeInt(short i0, short i1) { + return (toUnsignedInt(i0) << pickPos(16, 0)) + | (toUnsignedInt(i1) << pickPos(16, 16)); + } + private static int makeInt(byte i0, byte i1, byte i2, byte i3) { + return ((toUnsignedInt(i0) << pickPos(24, 0)) + | (toUnsignedInt(i1) << pickPos(24, 8)) + | (toUnsignedInt(i2) << pickPos(24, 16)) + | (toUnsignedInt(i3) << pickPos(24, 24))); + } + private static short makeShort(byte i0, byte i1) { + return (short)((toUnsignedInt(i0) << pickPos(8, 0)) + | (toUnsignedInt(i1) << pickPos(8, 8))); + } + + private static byte pick(byte le, byte be) { return BE ? be : le; } + private static short pick(short le, short be) { return BE ? be : le; } + private static int pick(int le, int be) { return BE ? be : le; } + + // These methods write integers to memory from smaller parts + // provided by their caller. The ordering in which these parts + // are written is the native endianness of this platform. + private void putLongParts(Object o, long offset, byte i0, byte i1, byte i2, byte i3, byte i4, byte i5, byte i6, byte i7) { + putByte(o, offset + 0, pick(i0, i7)); + putByte(o, offset + 1, pick(i1, i6)); + putByte(o, offset + 2, pick(i2, i5)); + putByte(o, offset + 3, pick(i3, i4)); + putByte(o, offset + 4, pick(i4, i3)); + putByte(o, offset + 5, pick(i5, i2)); + putByte(o, offset + 6, pick(i6, i1)); + putByte(o, offset + 7, pick(i7, i0)); + } + private void putLongParts(Object o, long offset, short i0, short i1, short i2, short i3) { + putShort(o, offset + 0, pick(i0, i3)); + putShort(o, offset + 2, pick(i1, i2)); + putShort(o, offset + 4, pick(i2, i1)); + putShort(o, offset + 6, pick(i3, i0)); + } + private void putLongParts(Object o, long offset, int i0, int i1) { + putInt(o, offset + 0, pick(i0, i1)); + putInt(o, offset + 4, pick(i1, i0)); + } + private void putIntParts(Object o, long offset, short i0, short i1) { + putShort(o, offset + 0, pick(i0, i1)); + putShort(o, offset + 2, pick(i1, i0)); + } + private void putIntParts(Object o, long offset, byte i0, byte i1, byte i2, byte i3) { + putByte(o, offset + 0, pick(i0, i3)); + putByte(o, offset + 1, pick(i1, i2)); + putByte(o, offset + 2, pick(i2, i1)); + putByte(o, offset + 3, pick(i3, i0)); + } + private void putShortParts(Object o, long offset, byte i0, byte i1) { + putByte(o, offset + 0, pick(i0, i1)); + putByte(o, offset + 1, pick(i1, i0)); + } + + // Zero-extend an integer + private static int toUnsignedInt(byte n) { return n & 0xff; } + private static int toUnsignedInt(short n) { return n & 0xffff; } + private static long toUnsignedLong(byte n) { return n & 0xffl; } + private static long toUnsignedLong(short n) { return n & 0xffffl; } + private static long toUnsignedLong(int n) { return n & 0xffffffffl; } + + // Maybe byte-reverse an integer + private static char convEndian(boolean big, char n) { return big == BE ? n : Character.reverseBytes(n); } + private static short convEndian(boolean big, short n) { return big == BE ? n : Short.reverseBytes(n) ; } + private static int convEndian(boolean big, int n) { return big == BE ? n : Integer.reverseBytes(n) ; } + private static long convEndian(boolean big, long n) { return big == BE ? n : Long.reverseBytes(n) ; } } diff -r 981893a47bec -r ebd762f09224 jdk/src/java.base/share/classes/sun/security/provider/ByteArrayAccess.java --- a/jdk/src/java.base/share/classes/sun/security/provider/ByteArrayAccess.java Thu Apr 02 12:33:03 2015 -0700 +++ b/jdk/src/java.base/share/classes/sun/security/provider/ByteArrayAccess.java Fri Apr 03 11:41:26 2015 -0700 @@ -1,5 +1,5 @@ /* - * Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2006, 2015, Oracle and/or its affiliates. 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 @@ -88,13 +88,8 @@ // Return whether this platform supports full speed int/long memory access // at unaligned addresses. - // This code was copied from java.nio.Bits because there is no equivalent - // public API. private static boolean unaligned() { - String arch = java.security.AccessController.doPrivileged - (new sun.security.action.GetPropertyAction("os.arch", "")); - return arch.equals("i386") || arch.equals("x86") || arch.equals("amd64") - || arch.equals("x86_64"); + return unsafe.unalignedAccess(); } /**