9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package jdk.internal.misc;
27
28 import jdk.internal.HotSpotIntrinsicCandidate;
29 import jdk.internal.vm.annotation.ForceInline;
30
31 import java.lang.reflect.Field;
32 import java.security.ProtectionDomain;
33
34
35 /**
36 * A collection of methods for performing low-level, unsafe operations.
37 * Although the class and all methods are public, use of this class is
38 * limited because only trusted code can obtain instances of it.
39 *
40 * <em>Note:</em> It is the resposibility of the caller to make sure
41 * arguments are checked before methods of this class are
42 * called. While some rudimentary checks are performed on the input,
43 * the checks are best effort and when performance is an overriding
44 * priority, as when methods of this class are optimized by the
45 * runtime compiler, some or all checks (if any) may be elided. Hence,
46 * the caller must not rely on the checks and corresponding
47 * exceptions!
48 *
49 * @author John R. Rose
3707 private native long allocateMemory0(long bytes);
3708 private native long reallocateMemory0(long address, long bytes);
3709 private native void freeMemory0(long address);
3710 private native void setMemory0(Object o, long offset, long bytes, byte value);
3711 @HotSpotIntrinsicCandidate
3712 private native void copyMemory0(Object srcBase, long srcOffset, Object destBase, long destOffset, long bytes);
3713 private native void copySwapMemory0(Object srcBase, long srcOffset, Object destBase, long destOffset, long bytes, long elemSize);
3714 private native long objectFieldOffset0(Field f);
3715 private native long objectFieldOffset1(Class<?> c, String name);
3716 private native long staticFieldOffset0(Field f);
3717 private native Object staticFieldBase0(Field f);
3718 private native boolean shouldBeInitialized0(Class<?> c);
3719 private native void ensureClassInitialized0(Class<?> c);
3720 private native int arrayBaseOffset0(Class<?> arrayClass);
3721 private native int arrayIndexScale0(Class<?> arrayClass);
3722 private native int addressSize0();
3723 private native Class<?> defineAnonymousClass0(Class<?> hostClass, byte[] data, Object[] cpPatches);
3724 private native int getLoadAverage0(double[] loadavg, int nelems);
3725 private native boolean unalignedAccess0();
3726 private native boolean isBigEndian0();
3727 }
|
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package jdk.internal.misc;
27
28 import jdk.internal.HotSpotIntrinsicCandidate;
29 import jdk.internal.ref.Cleaner;
30 import jdk.internal.vm.annotation.ForceInline;
31 import sun.nio.ch.DirectBuffer;
32
33 import java.lang.reflect.Field;
34 import java.security.ProtectionDomain;
35
36
37 /**
38 * A collection of methods for performing low-level, unsafe operations.
39 * Although the class and all methods are public, use of this class is
40 * limited because only trusted code can obtain instances of it.
41 *
42 * <em>Note:</em> It is the resposibility of the caller to make sure
43 * arguments are checked before methods of this class are
44 * called. While some rudimentary checks are performed on the input,
45 * the checks are best effort and when performance is an overriding
46 * priority, as when methods of this class are optimized by the
47 * runtime compiler, some or all checks (if any) may be elided. Hence,
48 * the caller must not rely on the checks and corresponding
49 * exceptions!
50 *
51 * @author John R. Rose
3709 private native long allocateMemory0(long bytes);
3710 private native long reallocateMemory0(long address, long bytes);
3711 private native void freeMemory0(long address);
3712 private native void setMemory0(Object o, long offset, long bytes, byte value);
3713 @HotSpotIntrinsicCandidate
3714 private native void copyMemory0(Object srcBase, long srcOffset, Object destBase, long destOffset, long bytes);
3715 private native void copySwapMemory0(Object srcBase, long srcOffset, Object destBase, long destOffset, long bytes, long elemSize);
3716 private native long objectFieldOffset0(Field f);
3717 private native long objectFieldOffset1(Class<?> c, String name);
3718 private native long staticFieldOffset0(Field f);
3719 private native Object staticFieldBase0(Field f);
3720 private native boolean shouldBeInitialized0(Class<?> c);
3721 private native void ensureClassInitialized0(Class<?> c);
3722 private native int arrayBaseOffset0(Class<?> arrayClass);
3723 private native int arrayIndexScale0(Class<?> arrayClass);
3724 private native int addressSize0();
3725 private native Class<?> defineAnonymousClass0(Class<?> hostClass, byte[] data, Object[] cpPatches);
3726 private native int getLoadAverage0(double[] loadavg, int nelems);
3727 private native boolean unalignedAccess0();
3728 private native boolean isBigEndian0();
3729
3730 /**
3731 * Invokes the given direct byte buffer's cleaner, if any.
3732 *
3733 * @param directBuffer a direct byte buffer
3734 * @throws NullPointerException if {@code directBuffer} is null
3735 * @throws IllegalArgumentException if {@code directBuffer} is non-direct,
3736 * or is a {@link java.nio.Buffer#slice slice}, or is a
3737 * {@link java.nio.Buffer#duplicate duplicate}
3738 */
3739 public void invokeCleaner(java.nio.ByteBuffer directBuffer) {
3740 if (!directBuffer.isDirect())
3741 throw new IllegalArgumentException("buffer is non-direct");
3742
3743 DirectBuffer db = (DirectBuffer) directBuffer;
3744 if (db.attachment() != null)
3745 throw new IllegalArgumentException("duplicate or slice");
3746
3747 Cleaner cleaner = db.cleaner();
3748 if (cleaner != null) {
3749 cleaner.clean();
3750 }
3751 }
3752 }
|