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@@ -0,0 +1,924 @@
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+package net.ranides.assira.reflection;
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+
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+import java.lang.reflect.Field;
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+import java.security.ProtectionDomain;
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+
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+public class UnsafeUtils {
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+
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+ public static void suppressReflectionWarning() {
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+ try {
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+ var cls = Class.forName("jdk.internal.module.IllegalAccessLogger");
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+ var logger = cls.getDeclaredField("logger");
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+ var unsafe = getUnsafe();
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+ unsafe.putObjectVolatile(cls, unsafe.staticFieldOffset(logger), null);
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+ } catch (Throwable e) {
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+ // We ignore EVERY exception thrown by code above because we don't want to crash application
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+ // just because of some exotic error in ugly hack against useless warning.
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+ }
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+ }
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+
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+ public static UnsafeAdapter getUnsafe() throws ReflectiveOperationException {
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+ return getUnsafe0(UnsafeAdapter.class);
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+ }
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+
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+ public static UnsafeAdapter8 getUnsafe8() throws ReflectiveOperationException {
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+ return getUnsafe0(UnsafeAdapter8.class);
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+ }
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+
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+ public static UnsafeAdapter9 getUnsafe9() throws ReflectiveOperationException {
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+ return getUnsafe0(UnsafeAdapter9.class);
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+ }
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+
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+ private static <T> T getUnsafe0(Class<T> type) throws ReflectiveOperationException {
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+ var theUnsafe = Class.forName("sun.misc.Unsafe").getDeclaredField("theUnsafe");
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+ theUnsafe.setAccessible(true);
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+ return AdapterFactory.getSystem().cast(IClass.typeinfo(type), theUnsafe.get(null));
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+ }
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+
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+ public interface UnsafeAdapter {
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+
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+ /**
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+ * Fetches a value from a given Java variable.
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+ * More specifically, fetches a field or array element within the given
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+ * object {@code o} at the given offset, or (if {@code o} is null)
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+ * from the memory address whose numerical value is the given offset.
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+ * <p>
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+ * The results are undefined unless one of the following cases is true:
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+ * <ul>
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+ * <li>The offset was obtained from {@link #objectFieldOffset} on
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+ * the {@link Field} of some Java field and the object
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+ * referred to by {@code o} is of a class compatible with that
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+ * field's class.
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+ *
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+ * <li>The offset and object reference {@code o} (either null or
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+ * non-null) were both obtained via {@link #staticFieldOffset}
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+ * and {@link #staticFieldBase} (respectively) from the
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+ * reflective {@link Field} representation of some Java field.
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+ *
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+ * <li>The object referred to by {@code o} is an array, and the offset
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+ * is an integer of the form {@code B+N*S}, where {@code N} is
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+ * a valid index into the array, and {@code B} and {@code S} are
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+ * the values obtained by {@link #arrayBaseOffset} and {@link
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+ * #arrayIndexScale} (respectively) from the array's class. The value
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+ * referred to is the {@code N}<em>th</em> element of the array.
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+ *
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+ * </ul>
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+ * <p>
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+ * If one of the above cases is true, the call references a specific Java
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+ * variable (field or array element). However, the results are undefined
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+ * if that variable is not in fact of the type returned by this method.
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+ * <p>
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+ * This method refers to a variable by means of two parameters, and so
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+ * it provides (in effect) a <em>double-register</em> addressing mode
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+ * for Java variables. When the object reference is null, this method
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+ * uses its offset as an absolute address. This is similar in operation
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+ * to methods such as {@link #getInt(long)}, which provide (in effect) a
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+ * <em>single-register</em> addressing mode for non-Java variables.
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+ * However, because Java variables may have a different layout in memory
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+ * from non-Java variables, programmers should not assume that these
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+ * two addressing modes are ever equivalent. Also, programmers should
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+ * remember that offsets from the double-register addressing mode cannot
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+ * be portably confused with longs used in the single-register addressing
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+ * mode.
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+ *
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+ * @param o Java heap object in which the variable resides, if any, else
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+ * null
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+ * @param offset indication of where the variable resides in a Java heap
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+ * object, if any, else a memory address locating the variable
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+ * statically
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+ * @return the value fetched from the indicated Java variable
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+ * @throws RuntimeException No defined exceptions are thrown, not even
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+ * {@link NullPointerException}
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+ */
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+ int getInt(Object o, long offset);
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+
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+ /**
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+ * Stores a value into a given Java variable.
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+ * <p>
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+ * The first two parameters are interpreted exactly as with
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+ * {@link #getInt(Object, long)} to refer to a specific
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+ * Java variable (field or array element). The given value
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+ * is stored into that variable.
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+ * <p>
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+ * The variable must be of the same type as the method
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+ * parameter {@code x}.
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+ *
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+ * @param o Java heap object in which the variable resides, if any, else
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+ * null
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+ * @param offset indication of where the variable resides in a Java heap
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+ * object, if any, else a memory address locating the variable
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+ * statically
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+ * @param x the value to store into the indicated Java variable
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+ * @throws RuntimeException No defined exceptions are thrown, not even
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+ * {@link NullPointerException}
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+ */
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+ void putInt(Object o, long offset, int x);
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+
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+ /**
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+ * Fetches a reference value from a given Java variable.
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+ *
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+ * @see #getInt(Object, long)
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+ */
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+ Object getObject(Object o, long offset);
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+
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+ /**
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+ * Stores a reference value into a given Java variable.
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+ * <p>
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+ * Unless the reference {@code x} being stored is either null
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+ * or matches the field type, the results are undefined.
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+ * If the reference {@code o} is non-null, card marks or
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+ * other store barriers for that object (if the VM requires them)
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+ * are updated.
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+ *
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+ * @see #putInt(Object, long, int)
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+ */
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+ void putObject(Object o, long offset, Object x);
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+
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+ /**
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+ * @see #getInt(Object, long)
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+ */
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+ boolean getBoolean(Object o, long offset);
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+
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+ /**
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+ * @see #putInt(Object, long, int)
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+ */
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+ void putBoolean(Object o, long offset, boolean x);
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+
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+ /**
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+ * @see #getInt(Object, long)
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+ */
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+ byte getByte(Object o, long offset);
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+
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+ /**
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+ * @see #putInt(Object, long, int)
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+ */
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+ void putByte(Object o, long offset, byte x);
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+
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+ /**
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+ * @see #getInt(Object, long)
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+ */
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+ short getShort(Object o, long offset);
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+
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+ /**
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+ * @see #putInt(Object, long, int)
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+ */
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+ void putShort(Object o, long offset, short x);
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+
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+ /**
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+ * @see #getInt(Object, long)
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+ */
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+ char getChar(Object o, long offset);
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+
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+ /**
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+ * @see #putInt(Object, long, int)
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+ */
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+ void putChar(Object o, long offset, char x);
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+
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+ /**
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+ * @see #getInt(Object, long)
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+ */
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+ long getLong(Object o, long offset);
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+
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+ /**
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+ * @see #putInt(Object, long, int)
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+ */
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+ void putLong(Object o, long offset, long x);
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+
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+ /**
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+ * @see #getInt(Object, long)
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+ */
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+ float getFloat(Object o, long offset);
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+
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+ /**
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+ * @see #putInt(Object, long, int)
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+ */
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+ void putFloat(Object o, long offset, float x);
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+
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+ /**
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+ * @see #getInt(Object, long)
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+ */
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+ double getDouble(Object o, long offset);
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+
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+ /**
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+ * @see #putInt(Object, long, int)
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+ */
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+ void putDouble(Object o, long offset, double x);
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+
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+ /**
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+ * Fetches a value from a given memory address. If the address is zero, or
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+ * does not point into a block obtained from {@link #allocateMemory}, the
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+ * results are undefined.
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+ *
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+ * @see #allocateMemory
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+ */
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+ byte getByte(long address);
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+
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+ /**
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+ * Stores a value into a given memory address. If the address is zero, or
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+ * does not point into a block obtained from {@link #allocateMemory}, the
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+ * results are undefined.
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+ *
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+ * @see #getByte(long)
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+ */
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+ void putByte(long address, byte x);
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+
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+ /**
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+ * @see #getByte(long)
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+ */
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+ short getShort(long address);
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+
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+ /**
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+ * @see #putByte(long, byte)
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+ */
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+ void putShort(long address, short x);
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+
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+ /**
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+ * @see #getByte(long)
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+ */
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+ char getChar(long address);
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+
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+ /**
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+ * @see #putByte(long, byte)
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+ */
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+ void putChar(long address, char x);
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+
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+ /**
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+ * @see #getByte(long)
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+ */
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+ int getInt(long address);
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+
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+ /**
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+ * @see #putByte(long, byte)
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+ */
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+ void putInt(long address, int x);
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+
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+ /**
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+ * @see #getByte(long)
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+ */
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+ long getLong(long address);
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+
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+ /**
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+ * @see #putByte(long, byte)
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+ */
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+ void putLong(long address, long x);
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+
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+ /**
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+ * @see #getByte(long)
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+ */
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+ float getFloat(long address);
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+
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+ /**
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+ * @see #putByte(long, byte)
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+ */
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+ void putFloat(long address, float x);
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+
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+ /**
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+ * @see #getByte(long)
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+ */
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+ double getDouble(long address);
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+
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+ /**
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+ * @see #putByte(long, byte)
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+ */
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+ void putDouble(long address, double x);
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+
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+ /**
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+ * Fetches a native pointer from a given memory address. If the address is
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+ * zero, or does not point into a block obtained from {@link
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+ * #allocateMemory}, the results are undefined.
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+ *
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+ * <p>If the native pointer is less than 64 bits wide, it is extended as
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+ * an unsigned number to a Java long. The pointer may be indexed by any
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+ * given byte offset, simply by adding that offset (as a simple integer) to
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+ * the long representing the pointer. The number of bytes actually read
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+ * from the target address may be determined by consulting {@link
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+ * #addressSize}.
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+ *
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+ * @see #allocateMemory
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+ */
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+ long getAddress(long address);
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+
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+ /**
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+ * Stores a native pointer into a given memory address. If the address is
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+ * zero, or does not point into a block obtained from {@link
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+ * #allocateMemory}, the results are undefined.
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+ *
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+ * <p>The number of bytes actually written at the target address may be
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+ * determined by consulting {@link #addressSize}.
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+ *
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+ * @see #getAddress(long)
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+ */
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+ void putAddress(long address, long x);
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+
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+ /**
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+ * Allocates a new block of native memory, of the given size in bytes. The
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+ * contents of the memory are uninitialized; they will generally be
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+ * garbage. The resulting native pointer will never be zero, and will be
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+ * aligned for all value types. Dispose of this memory by calling {@link
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+ * #freeMemory}, or resize it with {@link #reallocateMemory}.
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+ *
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+ * <em>Note:</em> It is the resposibility of the caller to make
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+ * sure arguments are checked before the methods are called. While
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+ * some rudimentary checks are performed on the input, the checks
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+ * are best effort and when performance is an overriding priority,
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+ * as when methods of this class are optimized by the runtime
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+ * compiler, some or all checks (if any) may be elided. Hence, the
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+ * caller must not rely on the checks and corresponding
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+ * exceptions!
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+ *
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+ * @throws RuntimeException if the size is negative or too large
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+ * for the native size_t type
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+ * @throws OutOfMemoryError if the allocation is refused by the system
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+ * @see #getByte(long)
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+ * @see #putByte(long, byte)
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+ */
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+ long allocateMemory(long bytes);
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+
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+ /**
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+ * Resizes a new block of native memory, to the given size in bytes. The
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+ * contents of the new block past the size of the old block are
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+ * uninitialized; they will generally be garbage. The resulting native
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+ * pointer will be zero if and only if the requested size is zero. The
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+ * resulting native pointer will be aligned for all value types. Dispose
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+ * of this memory by calling {@link #freeMemory}, or resize it with {@link
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+ * #reallocateMemory}. The address passed to this method may be null, in
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+ * which case an allocation will be performed.
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+ *
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+ * <em>Note:</em> It is the resposibility of the caller to make
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+ * sure arguments are checked before the methods are called. While
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+ * some rudimentary checks are performed on the input, the checks
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+ * are best effort and when performance is an overriding priority,
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+ * as when methods of this class are optimized by the runtime
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+ * compiler, some or all checks (if any) may be elided. Hence, the
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+ * caller must not rely on the checks and corresponding
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+ * exceptions!
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+ *
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+ * @throws RuntimeException if the size is negative or too large
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+ * for the native size_t type
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+ * @throws OutOfMemoryError if the allocation is refused by the system
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+ * @see #allocateMemory
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+ */
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+ long reallocateMemory(long address, long bytes);
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+
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+ /**
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+ * Sets all bytes in a given block of memory to a fixed value
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+ * (usually zero).
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+ *
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+ * <p>This method determines a block's base address by means of two parameters,
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+ * and so it provides (in effect) a <em>double-register</em> addressing mode,
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+ * as discussed in {@link #getInt(Object, long)}. When the object reference is null,
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+ * the offset supplies an absolute base address.
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+ *
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+ * <p>The stores are in coherent (atomic) units of a size determined
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+ * by the address and length parameters. If the effective address and
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+ * length are all even modulo 8, the stores take place in 'long' units.
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+ * If the effective address and length are (resp.) even modulo 4 or 2,
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+ * the stores take place in units of 'int' or 'short'.
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+ *
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+ * <em>Note:</em> It is the resposibility of the caller to make
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+ * sure arguments are checked before the methods are called. While
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+ * some rudimentary checks are performed on the input, the checks
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+ * are best effort and when performance is an overriding priority,
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+ * as when methods of this class are optimized by the runtime
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+ * compiler, some or all checks (if any) may be elided. Hence, the
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+ * caller must not rely on the checks and corresponding
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+ * exceptions!
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+ *
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+ * @throws RuntimeException if any of the arguments is invalid
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+ * @since 1.7
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+ */
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+ void setMemory(Object o, long offset, long bytes, byte value);
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+
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+ /**
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+ * Sets all bytes in a given block of memory to a fixed value
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+ * (usually zero). This provides a <em>single-register</em> addressing mode,
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+ * as discussed in {@link #getInt(Object, long)}.
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+ *
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+ * <p>Equivalent to {@code setMemory(null, address, bytes, value)}.
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+ */
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+ void setMemory(long address, long bytes, byte value);
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+
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+ /**
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+ * Sets all bytes in a given block of memory to a copy of another
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+ * block.
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+ *
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+ * <p>This method determines each block's base address by means of two parameters,
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+ * and so it provides (in effect) a <em>double-register</em> addressing mode,
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+ * as discussed in {@link #getInt(Object, long)}. When the object reference is null,
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+ * the offset supplies an absolute base address.
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+ *
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|
|
+ * <p>The transfers are in coherent (atomic) units of a size determined
|
|
|
+ * by the address and length parameters. If the effective addresses and
|
|
|
+ * length are all even modulo 8, the transfer takes place in 'long' units.
|
|
|
+ * If the effective addresses and length are (resp.) even modulo 4 or 2,
|
|
|
+ * the transfer takes place in units of 'int' or 'short'.
|
|
|
+ *
|
|
|
+ * <em>Note:</em> It is the resposibility of the caller to make
|
|
|
+ * sure arguments are checked before the methods are called. While
|
|
|
+ * some rudimentary checks are performed on the input, the checks
|
|
|
+ * are best effort and when performance is an overriding priority,
|
|
|
+ * as when methods of this class are optimized by the runtime
|
|
|
+ * compiler, some or all checks (if any) may be elided. Hence, the
|
|
|
+ * caller must not rely on the checks and corresponding
|
|
|
+ * exceptions!
|
|
|
+ *
|
|
|
+ * @throws RuntimeException if any of the arguments is invalid
|
|
|
+ * @since 1.7
|
|
|
+ */
|
|
|
+ void copyMemory(Object srcBase, long srcOffset,
|
|
|
+ Object destBase, long destOffset,
|
|
|
+ long bytes);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Sets all bytes in a given block of memory to a copy of another
|
|
|
+ * block. This provides a <em>single-register</em> addressing mode,
|
|
|
+ * as discussed in {@link #getInt(Object, long)}.
|
|
|
+ * <p>
|
|
|
+ * Equivalent to {@code copyMemory(null, srcAddress, null, destAddress, bytes)}.
|
|
|
+ */
|
|
|
+ void copyMemory(long srcAddress, long destAddress, long bytes);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Disposes of a block of native memory, as obtained from {@link
|
|
|
+ * #allocateMemory} or {@link #reallocateMemory}. The address passed to
|
|
|
+ * this method may be null, in which case no action is taken.
|
|
|
+ *
|
|
|
+ * <em>Note:</em> It is the resposibility of the caller to make
|
|
|
+ * sure arguments are checked before the methods are called. While
|
|
|
+ * some rudimentary checks are performed on the input, the checks
|
|
|
+ * are best effort and when performance is an overriding priority,
|
|
|
+ * as when methods of this class are optimized by the runtime
|
|
|
+ * compiler, some or all checks (if any) may be elided. Hence, the
|
|
|
+ * caller must not rely on the checks and corresponding
|
|
|
+ * exceptions!
|
|
|
+ *
|
|
|
+ * @throws RuntimeException if any of the arguments is invalid
|
|
|
+ * @see #allocateMemory
|
|
|
+ */
|
|
|
+ void freeMemory(long address);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Reports the location of a given field in the storage allocation of its
|
|
|
+ * class. Do not expect to perform any sort of arithmetic on this offset;
|
|
|
+ * it is just a cookie which is passed to the unsafe heap memory accessors.
|
|
|
+ *
|
|
|
+ * <p>Any given field will always have the same offset and base, and no
|
|
|
+ * two distinct fields of the same class will ever have the same offset
|
|
|
+ * and base.
|
|
|
+ *
|
|
|
+ * <p>As of 1.4.1, offsets for fields are represented as long values,
|
|
|
+ * although the Sun JVM does not use the most significant 32 bits.
|
|
|
+ * However, JVM implementations which store static fields at absolute
|
|
|
+ * addresses can use long offsets and null base pointers to express
|
|
|
+ * the field locations in a form usable by {@link #getInt(Object, long)}.
|
|
|
+ * Therefore, code which will be ported to such JVMs on 64-bit platforms
|
|
|
+ * must preserve all bits of static field offsets.
|
|
|
+ *
|
|
|
+ * @see #getInt(Object, long)
|
|
|
+ */
|
|
|
+ long objectFieldOffset(Field f);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Reports the location of a given static field, in conjunction with {@link
|
|
|
+ * #staticFieldBase}.
|
|
|
+ * <p>Do not expect to perform any sort of arithmetic on this offset;
|
|
|
+ * it is just a cookie which is passed to the unsafe heap memory accessors.
|
|
|
+ *
|
|
|
+ * <p>Any given field will always have the same offset, and no two distinct
|
|
|
+ * fields of the same class will ever have the same offset.
|
|
|
+ *
|
|
|
+ * <p>As of 1.4.1, offsets for fields are represented as long values,
|
|
|
+ * although the Sun JVM does not use the most significant 32 bits.
|
|
|
+ * It is hard to imagine a JVM technology which needs more than
|
|
|
+ * a few bits to encode an offset within a non-array object,
|
|
|
+ * However, for consistency with other methods in this class,
|
|
|
+ * this method reports its result as a long value.
|
|
|
+ *
|
|
|
+ * @see #getInt(Object, long)
|
|
|
+ */
|
|
|
+ long staticFieldOffset(Field f);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Reports the location of a given static field, in conjunction with {@link
|
|
|
+ * #staticFieldOffset}.
|
|
|
+ * <p>Fetch the base "Object", if any, with which static fields of the
|
|
|
+ * given class can be accessed via methods like {@link #getInt(Object,
|
|
|
+ * long)}. This value may be null. This value may refer to an object
|
|
|
+ * which is a "cookie", not guaranteed to be a real Object, and it should
|
|
|
+ * not be used in any way except as argument to the get and put routines in
|
|
|
+ * this class.
|
|
|
+ */
|
|
|
+ Object staticFieldBase(Field f);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Detects if the given class may need to be initialized. This is often
|
|
|
+ * needed in conjunction with obtaining the static field base of a
|
|
|
+ * class.
|
|
|
+ *
|
|
|
+ * @return false only if a call to {@code ensureClassInitialized} would have no effect
|
|
|
+ */
|
|
|
+ boolean shouldBeInitialized(Class<?> c);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Ensures the given class has been initialized. This is often
|
|
|
+ * needed in conjunction with obtaining the static field base of a
|
|
|
+ * class.
|
|
|
+ */
|
|
|
+ void ensureClassInitialized(Class<?> c);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Reports the offset of the first element in the storage allocation of a
|
|
|
+ * given array class. If {@link #arrayIndexScale} returns a non-zero value
|
|
|
+ * for the same class, you may use that scale factor, together with this
|
|
|
+ * base offset, to form new offsets to access elements of arrays of the
|
|
|
+ * given class.
|
|
|
+ *
|
|
|
+ * @see #getInt(Object, long)
|
|
|
+ * @see #putInt(Object, long, int)
|
|
|
+ */
|
|
|
+ int arrayBaseOffset(Class<?> arrayClass);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Reports the scale factor for addressing elements in the storage
|
|
|
+ * allocation of a given array class. However, arrays of "narrow" types
|
|
|
+ * will generally not work properly with accessors like {@link
|
|
|
+ * #getByte(Object, long)}, so the scale factor for such classes is reported
|
|
|
+ * as zero.
|
|
|
+ *
|
|
|
+ * @see #arrayBaseOffset
|
|
|
+ * @see #getInt(Object, long)
|
|
|
+ * @see #putInt(Object, long, int)
|
|
|
+ */
|
|
|
+ int arrayIndexScale(Class<?> arrayClass);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Reports the size in bytes of a native pointer, as stored via {@link
|
|
|
+ * #putAddress}. This value will be either 4 or 8. Note that the sizes of
|
|
|
+ * other primitive types (as stored in native memory blocks) is determined
|
|
|
+ * fully by their information content.
|
|
|
+ */
|
|
|
+ int addressSize();
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Reports the size in bytes of a native memory page (whatever that is).
|
|
|
+ * This value will always be a power of two.
|
|
|
+ */
|
|
|
+ int pageSize();
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Defines a class but does not make it known to the class loader or system dictionary.
|
|
|
+ * <p>
|
|
|
+ * For each CP entry, the corresponding CP patch must either be null or have
|
|
|
+ * the a format that matches its tag:
|
|
|
+ * <ul>
|
|
|
+ * <li>Integer, Long, Float, Double: the corresponding wrapper object type from java.lang
|
|
|
+ * <li>Utf8: a string (must have suitable syntax if used as signature or name)
|
|
|
+ * <li>Class: any java.lang.Class object
|
|
|
+ * <li>String: any object (not just a java.lang.String)
|
|
|
+ * <li>InterfaceMethodRef: (NYI) a method handle to invoke on that call site's arguments
|
|
|
+ * </ul>
|
|
|
+ *
|
|
|
+ * @param hostClass context for linkage, access control, protection domain, and class loader
|
|
|
+ * @param data bytes of a class file
|
|
|
+ * @param cpPatches where non-null entries exist, they replace corresponding CP entries in data
|
|
|
+ */
|
|
|
+ Class<?> defineAnonymousClass(Class<?> hostClass, byte[] data, Object[] cpPatches);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Allocates an instance but does not run any constructor.
|
|
|
+ * Initializes the class if it has not yet been.
|
|
|
+ */
|
|
|
+ Object allocateInstance(Class<?> cls);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Throws the exception without telling the verifier.
|
|
|
+ */
|
|
|
+ void throwException(Throwable ee);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Atomically updates Java variable to {@code x} if it is currently
|
|
|
+ * holding {@code expected}.
|
|
|
+ *
|
|
|
+ * <p>This operation has memory semantics of a {@code volatile} read
|
|
|
+ * and write. Corresponds to C11 atomic_compare_exchange_strong.
|
|
|
+ *
|
|
|
+ * @return {@code true} if successful
|
|
|
+ */
|
|
|
+ boolean compareAndSwapObject(Object o, long offset,
|
|
|
+ Object expected,
|
|
|
+ Object x);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Atomically updates Java variable to {@code x} if it is currently
|
|
|
+ * holding {@code expected}.
|
|
|
+ *
|
|
|
+ * <p>This operation has memory semantics of a {@code volatile} read
|
|
|
+ * and write. Corresponds to C11 atomic_compare_exchange_strong.
|
|
|
+ *
|
|
|
+ * @return {@code true} if successful
|
|
|
+ */
|
|
|
+ boolean compareAndSwapInt(Object o, long offset, int expected, int x);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Atomically updates Java variable to {@code x} if it is currently
|
|
|
+ * holding {@code expected}.
|
|
|
+ *
|
|
|
+ * <p>This operation has memory semantics of a {@code volatile} read
|
|
|
+ * and write. Corresponds to C11 atomic_compare_exchange_strong.
|
|
|
+ *
|
|
|
+ * @return {@code true} if successful
|
|
|
+ */
|
|
|
+ boolean compareAndSwapLong(Object o, long offset, long expected, long x);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Fetches a reference value from a given Java variable, with volatile
|
|
|
+ * load semantics. Otherwise identical to {@link #getObject(Object, long)}
|
|
|
+ */
|
|
|
+ Object getObjectVolatile(Object o, long offset);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Stores a reference value into a given Java variable, with
|
|
|
+ * volatile store semantics. Otherwise identical to {@link #putObject(Object, long, Object)}
|
|
|
+ */
|
|
|
+ void putObjectVolatile(Object o, long offset, Object x);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Volatile version of {@link #getInt(Object, long)}
|
|
|
+ */
|
|
|
+ int getIntVolatile(Object o, long offset);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Volatile version of {@link #putInt(Object, long, int)}
|
|
|
+ */
|
|
|
+ void putIntVolatile(Object o, long offset, int x);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Volatile version of {@link #getBoolean(Object, long)}
|
|
|
+ */
|
|
|
+ boolean getBooleanVolatile(Object o, long offset);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Volatile version of {@link #putBoolean(Object, long, boolean)}
|
|
|
+ */
|
|
|
+ void putBooleanVolatile(Object o, long offset, boolean x);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Volatile version of {@link #getByte(Object, long)}
|
|
|
+ */
|
|
|
+ byte getByteVolatile(Object o, long offset);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Volatile version of {@link #putByte(Object, long, byte)}
|
|
|
+ */
|
|
|
+ void putByteVolatile(Object o, long offset, byte x);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Volatile version of {@link #getShort(Object, long)}
|
|
|
+ */
|
|
|
+ short getShortVolatile(Object o, long offset);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Volatile version of {@link #putShort(Object, long, short)}
|
|
|
+ */
|
|
|
+ void putShortVolatile(Object o, long offset, short x);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Volatile version of {@link #getChar(Object, long)}
|
|
|
+ */
|
|
|
+ char getCharVolatile(Object o, long offset);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Volatile version of {@link #putChar(Object, long, char)}
|
|
|
+ */
|
|
|
+ void putCharVolatile(Object o, long offset, char x);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Volatile version of {@link #getLong(Object, long)}
|
|
|
+ */
|
|
|
+ long getLongVolatile(Object o, long offset);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Volatile version of {@link #putLong(Object, long, long)}
|
|
|
+ */
|
|
|
+ void putLongVolatile(Object o, long offset, long x);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Volatile version of {@link #getFloat(Object, long)}
|
|
|
+ */
|
|
|
+ float getFloatVolatile(Object o, long offset);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Volatile version of {@link #putFloat(Object, long, float)}
|
|
|
+ */
|
|
|
+ void putFloatVolatile(Object o, long offset, float x);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Volatile version of {@link #getDouble(Object, long)}
|
|
|
+ */
|
|
|
+ double getDoubleVolatile(Object o, long offset);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Volatile version of {@link #putDouble(Object, long, double)}
|
|
|
+ */
|
|
|
+ void putDoubleVolatile(Object o, long offset, double x);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Version of {@link #putObjectVolatile(Object, long, Object)}
|
|
|
+ * that does not guarantee immediate visibility of the store to
|
|
|
+ * other threads. This method is generally only useful if the
|
|
|
+ * underlying field is a Java volatile (or if an array cell, one
|
|
|
+ * that is otherwise only accessed using volatile accesses).
|
|
|
+ * <p>
|
|
|
+ * Corresponds to C11 atomic_store_explicit(..., memory_order_release).
|
|
|
+ */
|
|
|
+ void putOrderedObject(Object o, long offset, Object x);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Ordered/Lazy version of {@link #putIntVolatile(Object, long, int)}
|
|
|
+ */
|
|
|
+ void putOrderedInt(Object o, long offset, int x);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Ordered/Lazy version of {@link #putLongVolatile(Object, long, long)}
|
|
|
+ */
|
|
|
+ void putOrderedLong(Object o, long offset, long x);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Unblocks the given thread blocked on {@code park}, or, if it is
|
|
|
+ * not blocked, causes the subsequent call to {@code park} not to
|
|
|
+ * block. Note: this operation is "unsafe" solely because the
|
|
|
+ * caller must somehow ensure that the thread has not been
|
|
|
+ * destroyed. Nothing special is usually required to ensure this
|
|
|
+ * when called from Java (in which there will ordinarily be a live
|
|
|
+ * reference to the thread) but this is not nearly-automatically
|
|
|
+ * so when calling from native code.
|
|
|
+ *
|
|
|
+ * @param thread the thread to unpark.
|
|
|
+ */
|
|
|
+ void unpark(Object thread);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Blocks current thread, returning when a balancing
|
|
|
+ * {@code unpark} occurs, or a balancing {@code unpark} has
|
|
|
+ * already occurred, or the thread is interrupted, or, if not
|
|
|
+ * absolute and time is not zero, the given time nanoseconds have
|
|
|
+ * elapsed, or if absolute, the given deadline in milliseconds
|
|
|
+ * since Epoch has passed, or spuriously (i.e., returning for no
|
|
|
+ * "reason"). Note: This operation is in the Unsafe class only
|
|
|
+ * because {@code unpark} is, so it would be strange to place it
|
|
|
+ * elsewhere.
|
|
|
+ */
|
|
|
+ void park(boolean isAbsolute, long time);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Gets the load average in the system run queue assigned
|
|
|
+ * to the available processors averaged over various periods of time.
|
|
|
+ * This method retrieves the given {@code nelem} samples and
|
|
|
+ * assigns to the elements of the given {@code loadavg} array.
|
|
|
+ * The system imposes a maximum of 3 samples, representing
|
|
|
+ * averages over the last 1, 5, and 15 minutes, respectively.
|
|
|
+ *
|
|
|
+ * @param loadavg an array of double of size nelems
|
|
|
+ * @param nelems the number of samples to be retrieved and
|
|
|
+ * must be 1 to 3.
|
|
|
+ * @return the number of samples actually retrieved; or -1
|
|
|
+ * if the load average is unobtainable.
|
|
|
+ */
|
|
|
+ int getLoadAverage(double[] loadavg, int nelems);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Atomically adds the given value to the current value of a field
|
|
|
+ * or array element within the given object {@code o}
|
|
|
+ * at the given {@code offset}.
|
|
|
+ *
|
|
|
+ * @param o object/array to update the field/element in
|
|
|
+ * @param offset field/element offset
|
|
|
+ * @param delta the value to add
|
|
|
+ * @return the previous value
|
|
|
+ * @since 1.8
|
|
|
+ */
|
|
|
+ int getAndAddInt(Object o, long offset, int delta);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Atomically adds the given value to the current value of a field
|
|
|
+ * or array element within the given object {@code o}
|
|
|
+ * at the given {@code offset}.
|
|
|
+ *
|
|
|
+ * @param o object/array to update the field/element in
|
|
|
+ * @param offset field/element offset
|
|
|
+ * @param delta the value to add
|
|
|
+ * @return the previous value
|
|
|
+ * @since 1.8
|
|
|
+ */
|
|
|
+ long getAndAddLong(Object o, long offset, long delta);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Atomically exchanges the given value with the current value of
|
|
|
+ * a field or array element within the given object {@code o}
|
|
|
+ * at the given {@code offset}.
|
|
|
+ *
|
|
|
+ * @param o object/array to update the field/element in
|
|
|
+ * @param offset field/element offset
|
|
|
+ * @param newValue new value
|
|
|
+ * @return the previous value
|
|
|
+ * @since 1.8
|
|
|
+ */
|
|
|
+ int getAndSetInt(Object o, long offset, int newValue);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Atomically exchanges the given value with the current value of
|
|
|
+ * a field or array element within the given object {@code o}
|
|
|
+ * at the given {@code offset}.
|
|
|
+ *
|
|
|
+ * @param o object/array to update the field/element in
|
|
|
+ * @param offset field/element offset
|
|
|
+ * @param newValue new value
|
|
|
+ * @return the previous value
|
|
|
+ * @since 1.8
|
|
|
+ */
|
|
|
+ long getAndSetLong(Object o, long offset, long newValue);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Atomically exchanges the given reference value with the current
|
|
|
+ * reference value of a field or array element within the given
|
|
|
+ * object {@code o} at the given {@code offset}.
|
|
|
+ *
|
|
|
+ * @param o object/array to update the field/element in
|
|
|
+ * @param offset field/element offset
|
|
|
+ * @param newValue new value
|
|
|
+ * @return the previous value
|
|
|
+ * @since 1.8
|
|
|
+ */
|
|
|
+ Object getAndSetObject(Object o, long offset, Object newValue);
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Ensures that loads before the fence will not be reordered with loads and
|
|
|
+ * stores after the fence; a "LoadLoad plus LoadStore barrier".
|
|
|
+ * <p>
|
|
|
+ * Corresponds to C11 atomic_thread_fence(memory_order_acquire)
|
|
|
+ * (an "acquire fence").
|
|
|
+ * <p>
|
|
|
+ * A pure LoadLoad fence is not provided, since the addition of LoadStore
|
|
|
+ * is almost always desired, and most current hardware instructions that
|
|
|
+ * provide a LoadLoad barrier also provide a LoadStore barrier for free.
|
|
|
+ *
|
|
|
+ * @since 1.8
|
|
|
+ */
|
|
|
+ void loadFence();
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Ensures that loads and stores before the fence will not be reordered with
|
|
|
+ * stores after the fence; a "StoreStore plus LoadStore barrier".
|
|
|
+ * <p>
|
|
|
+ * Corresponds to C11 atomic_thread_fence(memory_order_release)
|
|
|
+ * (a "release fence").
|
|
|
+ * <p>
|
|
|
+ * A pure StoreStore fence is not provided, since the addition of LoadStore
|
|
|
+ * is almost always desired, and most current hardware instructions that
|
|
|
+ * provide a StoreStore barrier also provide a LoadStore barrier for free.
|
|
|
+ *
|
|
|
+ * @since 1.8
|
|
|
+ */
|
|
|
+ void storeFence();
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Ensures that loads and stores before the fence will not be reordered
|
|
|
+ * with loads and stores after the fence. Implies the effects of both
|
|
|
+ * loadFence() and storeFence(), and in addition, the effect of a StoreLoad
|
|
|
+ * barrier.
|
|
|
+ * <p>
|
|
|
+ * Corresponds to C11 atomic_thread_fence(memory_order_seq_cst).
|
|
|
+ *
|
|
|
+ * @since 1.8
|
|
|
+ */
|
|
|
+ void fullFence();
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ public interface UnsafeAdapter8 extends UnsafeAdapter {
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Tells the VM to define a class, without security checks. By default, the
|
|
|
+ * class loader and protection domain come from the caller's class.
|
|
|
+ */
|
|
|
+ Class<?> defineClass(String name, byte[] b, int off, int len, ClassLoader loader, ProtectionDomain protectionDomain);
|
|
|
+
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ public interface UnsafeAdapter9 extends UnsafeAdapter {
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Invokes the given direct byte buffer's cleaner, if any.
|
|
|
+ *
|
|
|
+ * @param directBuffer a direct byte buffer
|
|
|
+ * @throws NullPointerException if {@code directBuffer} is null
|
|
|
+ * @throws IllegalArgumentException if {@code directBuffer} is non-direct,
|
|
|
+ * or is a {@link java.nio.Buffer#slice slice}, or is a
|
|
|
+ * {@link java.nio.Buffer#duplicate duplicate}
|
|
|
+ * @since 9
|
|
|
+ */
|
|
|
+ void invokeCleaner(java.nio.ByteBuffer directBuffer);
|
|
|
+
|
|
|
+ }
|
|
|
+}
|
Mariusz Sieroń