166 *
167 * @param o Java heap object in which the variable resides, if any, else
168 * null
169 * @param offset indication of where the variable resides in a Java heap
170 * object, if any, else a memory address locating the variable
171 * statically
172 * @param x the value to store into the indicated Java variable
173 * @throws RuntimeException No defined exceptions are thrown, not even
174 * {@link NullPointerException}
175 */
176 @HotSpotIntrinsicCandidate
177 public native void putInt(Object o, long offset, int x);
178
179 /**
180 * Returns true if the given class is a regular value type.
181 */
182 public boolean isValueType(Class<?> c) {
183 return c.isValue() && c == c.asValueType();
184 }
185
186 /**
187 * Returns true if the given class is a flattened array.
188 */
189 public native boolean isFlattenedArray(Class<?> arrayClass);
190
191 /**
192 * Fetches a reference value from a given Java variable.
193 * This method can return a reference to either an object or value
194 * or a null reference.
195 *
196 * @see #getInt(Object, long)
197 */
198 @HotSpotIntrinsicCandidate
199 public native Object getReference(Object o, long offset);
200
201 /**
202 * Stores a reference value into a given Java variable.
203 * This method can store a reference to either an object or value
204 * or a null reference.
205 * <p>
219 * {@code o} object at the given offset, or (if {@code o} is null)
220 * from the memory address whose numerical value is the given offset.
221 *
222 * @param o Java heap object in which the variable resides, if any, else
223 * null
224 * @param offset indication of where the variable resides in a Java heap
225 * object, if any, else a memory address locating the variable
226 * statically
227 * @param vc value class
228 * @param <V> the type of a value
229 * @return the value fetched from the indicated Java variable
230 * @throws RuntimeException No defined exceptions are thrown, not even
231 * {@link NullPointerException}
232 */
233 public native <V> V getValue(Object o, long offset, Class<?> vc);
234
235 /**
236 * Stores the given value into a given Java variable.
237 *
238 * Unless the reference {@code o} being stored is either null
239 * or matches the field type and not in a value container,
240 * the results are undefined.
241 *
242 * @param o Java heap object in which the variable resides, if any, else
243 * null
244 * @param offset indication of where the variable resides in a Java heap
245 * object, if any, else a memory address locating the variable
246 * statically
247 * @param vc value class
248 * @param v the value to store into the indicated Java variable
249 * @param <V> the type of a value
250 * @throws RuntimeException No defined exceptions are thrown, not even
251 * {@link NullPointerException}
252 */
253 public native <V> void putValue(Object o, long offset, Class<?> vc, V v);
254
255 /** @see #getInt(Object, long) */
256 @HotSpotIntrinsicCandidate
257 public native boolean getBoolean(Object o, long offset);
258
259 /** @see #putInt(Object, long, int) */
260 @HotSpotIntrinsicCandidate
261 public native void putBoolean(Object o, long offset, boolean x);
262
263 /** @see #getInt(Object, long) */
264 @HotSpotIntrinsicCandidate
265 public native byte getByte(Object o, long offset);
266
267 /** @see #putInt(Object, long, int) */
268 @HotSpotIntrinsicCandidate
269 public native void putByte(Object o, long offset, byte x);
270
271 /** @see #getInt(Object, long) */
272 @HotSpotIntrinsicCandidate
273 public native short getShort(Object o, long offset);
274
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166 *
167 * @param o Java heap object in which the variable resides, if any, else
168 * null
169 * @param offset indication of where the variable resides in a Java heap
170 * object, if any, else a memory address locating the variable
171 * statically
172 * @param x the value to store into the indicated Java variable
173 * @throws RuntimeException No defined exceptions are thrown, not even
174 * {@link NullPointerException}
175 */
176 @HotSpotIntrinsicCandidate
177 public native void putInt(Object o, long offset, int x);
178
179 /**
180 * Returns true if the given class is a regular value type.
181 */
182 public boolean isValueType(Class<?> c) {
183 return c.isValue() && c == c.asValueType();
184 }
185
186 private static final int JVM_ACC_FLATTENED = 0x00008000; // HotSpot-specific bit
187
188 /**
189 * Returns true if the given field is flattened.
190 */
191 public boolean isFlattened(Field f) {
192 return (f.getModifiers() & JVM_ACC_FLATTENED) == JVM_ACC_FLATTENED;
193 }
194
195 /**
196 * Returns true if the given class is a flattened array.
197 */
198 public native boolean isFlattenedArray(Class<?> arrayClass);
199
200 /**
201 * Fetches a reference value from a given Java variable.
202 * This method can return a reference to either an object or value
203 * or a null reference.
204 *
205 * @see #getInt(Object, long)
206 */
207 @HotSpotIntrinsicCandidate
208 public native Object getReference(Object o, long offset);
209
210 /**
211 * Stores a reference value into a given Java variable.
212 * This method can store a reference to either an object or value
213 * or a null reference.
214 * <p>
228 * {@code o} object at the given offset, or (if {@code o} is null)
229 * from the memory address whose numerical value is the given offset.
230 *
231 * @param o Java heap object in which the variable resides, if any, else
232 * null
233 * @param offset indication of where the variable resides in a Java heap
234 * object, if any, else a memory address locating the variable
235 * statically
236 * @param vc value class
237 * @param <V> the type of a value
238 * @return the value fetched from the indicated Java variable
239 * @throws RuntimeException No defined exceptions are thrown, not even
240 * {@link NullPointerException}
241 */
242 public native <V> V getValue(Object o, long offset, Class<?> vc);
243
244 /**
245 * Stores the given value into a given Java variable.
246 *
247 * Unless the reference {@code o} being stored is either null
248 * or matches the field type, the results are undefined.
249 *
250 * @param o Java heap object in which the variable resides, if any, else
251 * null
252 * @param offset indication of where the variable resides in a Java heap
253 * object, if any, else a memory address locating the variable
254 * statically
255 * @param vc value class
256 * @param v the value to store into the indicated Java variable
257 * @param <V> the type of a value
258 * @throws RuntimeException No defined exceptions are thrown, not even
259 * {@link NullPointerException}
260 */
261 public native <V> void putValue(Object o, long offset, Class<?> vc, V v);
262
263 /**
264 * Returns an object instance with a private buffered value whose layout
265 * and contents is exactly the given value instance. The return object
266 * is in the larval state that can be updated using the unsafe put operation.
267 *
268 * @param value a value instance
269 * @param <V> the type of the given value instance
270 */
271 public native <V> V makePrivateBuffer(V value);
272
273 /**
274 * Exits the larval state and returns a value instance.
275 *
276 * @param value a value instance
277 * @param <V> the type of the given value instance
278 */
279 public native <V> V finishPrivateBuffer(V value);
280
281 /**
282 * Returns the header size of the given value class
283 *
284 * @param vc Value class
285 * @param <V> value clas
286 * @return the header size of the value class
287 */
288 public native <V> long valueHeaderSize(Class<V> vc);
289
290 /** @see #getInt(Object, long) */
291 @HotSpotIntrinsicCandidate
292 public native boolean getBoolean(Object o, long offset);
293
294 /** @see #putInt(Object, long, int) */
295 @HotSpotIntrinsicCandidate
296 public native void putBoolean(Object o, long offset, boolean x);
297
298 /** @see #getInt(Object, long) */
299 @HotSpotIntrinsicCandidate
300 public native byte getByte(Object o, long offset);
301
302 /** @see #putInt(Object, long, int) */
303 @HotSpotIntrinsicCandidate
304 public native void putByte(Object o, long offset, byte x);
305
306 /** @see #getInt(Object, long) */
307 @HotSpotIntrinsicCandidate
308 public native short getShort(Object o, long offset);
309
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