diff options
Diffstat (limited to 'libdvm/src/main/java/sun/misc/Unsafe.java')
| -rw-r--r-- | libdvm/src/main/java/sun/misc/Unsafe.java | 350 |
1 files changed, 0 insertions, 350 deletions
diff --git a/libdvm/src/main/java/sun/misc/Unsafe.java b/libdvm/src/main/java/sun/misc/Unsafe.java deleted file mode 100644 index 884340b..0000000 --- a/libdvm/src/main/java/sun/misc/Unsafe.java +++ /dev/null @@ -1,350 +0,0 @@ -/* - * Copyright (C) 2007 The Android Open Source Project - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -package sun.misc; - -import dalvik.system.VMStack; -import java.lang.reflect.Field; -import java.lang.reflect.Modifier; - -/** - * The package name notwithstanding, this class is the quasi-standard - * way for Java code to gain access to and use functionality which, - * when unsupervised, would allow one to break the pointer/type safety - * of Java. - */ -public final class Unsafe { - /** Traditional dalvik name. */ - private static final Unsafe THE_ONE = new Unsafe(); - /** Traditional RI name. */ - private static final Unsafe theUnsafe = THE_ONE; - - /** - * This class is only privately instantiable. - */ - private Unsafe() {} - - /** - * Gets the unique instance of this class. This is only allowed in - * very limited situations. - */ - public static Unsafe getUnsafe() { - /* - * Only code on the bootclasspath is allowed to get at the - * Unsafe instance. - */ - ClassLoader calling = VMStack.getCallingClassLoader(); - if ((calling != null) && (calling != Unsafe.class.getClassLoader())) { - throw new SecurityException("Unsafe access denied"); - } - - return THE_ONE; - } - - /** - * Gets the raw byte offset from the start of an object's memory to - * the memory used to store the indicated instance field. - * - * @param field non-null; the field in question, which must be an - * instance field - * @return the offset to the field - */ - public long objectFieldOffset(Field field) { - if (Modifier.isStatic(field.getModifiers())) { - throw new IllegalArgumentException( - "valid for instance fields only"); - } - - return objectFieldOffset0(field); - } - - /** - * Helper for {@link #objectFieldOffset}, which does all the work, - * assuming the parameter is deemed valid. - * - * @param field non-null; the instance field - * @return the offset to the field - */ - private static native long objectFieldOffset0(Field field); - - /** - * Gets the offset from the start of an array object's memory to - * the memory used to store its initial (zeroeth) element. - * - * @param clazz non-null; class in question; must be an array class - * @return the offset to the initial element - */ - public int arrayBaseOffset(Class clazz) { - if (! clazz.isArray()) { - throw new IllegalArgumentException( - "valid for array classes only"); - } - - return arrayBaseOffset0(clazz); - } - - /** - * Helper for {@link #arrayBaseOffset}, which does all the work, - * assuming the parameter is deemed valid. - * - * @return the offset to the field - */ - private static native int arrayBaseOffset0(Class clazz); - - /** - * Gets the size of each element of the given array class. - * - * @param clazz non-null; class in question; must be an array class - * @return > 0; the size of each element of the array - */ - public int arrayIndexScale(Class clazz) { - if (! clazz.isArray()) { - throw new IllegalArgumentException( - "valid for array classes only"); - } - - return arrayIndexScale0(clazz); - } - - /** - * Helper for {@link #arrayIndexScale}, which does all the work, - * assuming the parameter is deemed valid. - * - * @return the offset to the field - */ - private static native int arrayIndexScale0(Class clazz); - - /** - * Performs a compare-and-set operation on an <code>int</code> - * field within the given object. - * - * @param obj non-null; object containing the field - * @param offset offset to the field within <code>obj</code> - * @param expectedValue expected value of the field - * @param newValue new value to store in the field if the contents are - * as expected - * @return <code>true</code> if the new value was in fact stored, and - * <code>false</code> if not - */ - public native boolean compareAndSwapInt(Object obj, long offset, - int expectedValue, int newValue); - - /** - * Performs a compare-and-set operation on a <code>long</code> - * field within the given object. - * - * @param obj non-null; object containing the field - * @param offset offset to the field within <code>obj</code> - * @param expectedValue expected value of the field - * @param newValue new value to store in the field if the contents are - * as expected - * @return <code>true</code> if the new value was in fact stored, and - * <code>false</code> if not - */ - public native boolean compareAndSwapLong(Object obj, long offset, - long expectedValue, long newValue); - - /** - * Performs a compare-and-set operation on an <code>Object</code> - * field (that is, a reference field) within the given object. - * - * @param obj non-null; object containing the field - * @param offset offset to the field within <code>obj</code> - * @param expectedValue expected value of the field - * @param newValue new value to store in the field if the contents are - * as expected - * @return <code>true</code> if the new value was in fact stored, and - * <code>false</code> if not - */ - public native boolean compareAndSwapObject(Object obj, long offset, - Object expectedValue, Object newValue); - - /** - * Gets an <code>int</code> field from the given object, - * using <code>volatile</code> semantics. - * - * @param obj non-null; object containing the field - * @param offset offset to the field within <code>obj</code> - * @return the retrieved value - */ - public native int getIntVolatile(Object obj, long offset); - - /** - * Stores an <code>int</code> field into the given object, - * using <code>volatile</code> semantics. - * - * @param obj non-null; object containing the field - * @param offset offset to the field within <code>obj</code> - * @param newValue the value to store - */ - public native void putIntVolatile(Object obj, long offset, int newValue); - - /** - * Gets a <code>long</code> field from the given object, - * using <code>volatile</code> semantics. - * - * @param obj non-null; object containing the field - * @param offset offset to the field within <code>obj</code> - * @return the retrieved value - */ - public native long getLongVolatile(Object obj, long offset); - - /** - * Stores a <code>long</code> field into the given object, - * using <code>volatile</code> semantics. - * - * @param obj non-null; object containing the field - * @param offset offset to the field within <code>obj</code> - * @param newValue the value to store - */ - public native void putLongVolatile(Object obj, long offset, long newValue); - - /** - * Gets an <code>Object</code> field from the given object, - * using <code>volatile</code> semantics. - * - * @param obj non-null; object containing the field - * @param offset offset to the field within <code>obj</code> - * @return the retrieved value - */ - public native Object getObjectVolatile(Object obj, long offset); - - /** - * Stores an <code>Object</code> field into the given object, - * using <code>volatile</code> semantics. - * - * @param obj non-null; object containing the field - * @param offset offset to the field within <code>obj</code> - * @param newValue the value to store - */ - public native void putObjectVolatile(Object obj, long offset, - Object newValue); - - /** - * Gets an <code>int</code> field from the given object. - * - * @param obj non-null; object containing the field - * @param offset offset to the field within <code>obj</code> - * @return the retrieved value - */ - public native int getInt(Object obj, long offset); - - /** - * Stores an <code>int</code> field into the given object. - * - * @param obj non-null; object containing the field - * @param offset offset to the field within <code>obj</code> - * @param newValue the value to store - */ - public native void putInt(Object obj, long offset, int newValue); - - /** - * Lazy set an int field. - */ - public native void putOrderedInt(Object obj, long offset, int newValue); - - /** - * Gets a <code>long</code> field from the given object. - * - * @param obj non-null; object containing the field - * @param offset offset to the field within <code>obj</code> - * @return the retrieved value - */ - public native long getLong(Object obj, long offset); - - /** - * Stores a <code>long</code> field into the given object. - * - * @param obj non-null; object containing the field - * @param offset offset to the field within <code>obj</code> - * @param newValue the value to store - */ - public native void putLong(Object obj, long offset, long newValue); - - /** - * Lazy set a long field. - */ - public native void putOrderedLong(Object obj, long offset, long newValue); - - /** - * Gets an <code>Object</code> field from the given object. - * - * @param obj non-null; object containing the field - * @param offset offset to the field within <code>obj</code> - * @return the retrieved value - */ - public native Object getObject(Object obj, long offset); - - /** - * Stores an <code>Object</code> field into the given object. - * - * @param obj non-null; object containing the field - * @param offset offset to the field within <code>obj</code> - * @param newValue the value to store - */ - public native void putObject(Object obj, long offset, Object newValue); - - /** - * Lazy set an object field. - */ - public native void putOrderedObject(Object obj, long offset, - Object newValue); - - /** - * Parks the calling thread for the specified amount of time, - * unless the "permit" for the thread is already available (due to - * a previous call to {@link #unpark}. This method may also return - * spuriously (that is, without the thread being told to unpark - * and without the indicated amount of time elapsing). - * - * <p>See {@link java.util.concurrent.locks.LockSupport} for more - * in-depth information of the behavior of this method.</p> - * - * @param absolute whether the given time value is absolute - * milliseconds-since-the-epoch (<code>true</code>) or relative - * nanoseconds-from-now (<code>false</code>) - * @param time the (absolute millis or relative nanos) time value - */ - public void park(boolean absolute, long time) { - if (absolute) { - Thread.currentThread().parkUntil(time); - } else { - Thread.currentThread().parkFor(time); - } - } - - /** - * Unparks the given object, which must be a {@link Thread}. - * - * <p>See {@link java.util.concurrent.locks.LockSupport} for more - * in-depth information of the behavior of this method.</p> - * - * @param obj non-null; the object to unpark - */ - public void unpark(Object obj) { - if (obj instanceof Thread) { - ((Thread) obj).unpark(); - } else { - throw new IllegalArgumentException("valid for Threads only"); - } - } - - /** - * Allocates an instance of the given class without running the constructor. - * The class' <clinit> will be run, if necessary. - */ - public native Object allocateInstance(Class<?> c); -} |