6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "gc/shared/collectedHeap.hpp"
27 #include "gc/shared/oopStorage.inline.hpp"
28 #include "gc/shared/oopStorageSet.hpp"
29 #include "logging/log.hpp"
30 #include "memory/iterator.hpp"
31 #include "memory/universe.hpp"
32 #include "oops/access.inline.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "runtime/handles.inline.hpp"
35 #include "runtime/javaThread.inline.hpp"
36 #include "runtime/jniHandles.inline.hpp"
37 #include "runtime/mutexLocker.hpp"
38 #include "utilities/align.hpp"
39 #include "utilities/debug.hpp"
40
41 OopStorage* JNIHandles::global_handles() {
42 return _global_handles;
43 }
44
45 OopStorage* JNIHandles::weak_global_handles() {
46 return _weak_global_handles;
47 }
48
49 // Serviceability agent support.
50 OopStorage* JNIHandles::_global_handles = NULL;
51 OopStorage* JNIHandles::_weak_global_handles = NULL;
52
53 void jni_handles_init() {
54 JNIHandles::_global_handles = OopStorageSet::create_strong("JNI Global", mtInternal);
280 guarantee(oopDesc::is_oop_or_null(RawAccess<>::oop_load(root)), "Invalid oop");
281 }
282 virtual void do_oop(narrowOop* root) { ShouldNotReachHere(); }
283 };
284
285 void JNIHandles::verify() {
286 VerifyJNIHandles verify_handle;
287
288 oops_do(&verify_handle);
289 weak_oops_do(&verify_handle);
290 }
291
292 // This method is implemented here to avoid circular includes between
293 // jniHandles.hpp and thread.hpp.
294 bool JNIHandles::current_thread_in_native() {
295 Thread* thread = Thread::current();
296 return (thread->is_Java_thread() &&
297 JavaThread::cast(thread)->thread_state() == _thread_in_native);
298 }
299
300 int JNIHandleBlock::_blocks_allocated = 0;
301
302 static inline bool is_tagged_free_list(uintptr_t value) {
303 return (value & 1u) != 0;
304 }
305
306 static inline uintptr_t tag_free_list(uintptr_t value) {
307 return value | 1u;
308 }
309
310 static inline uintptr_t untag_free_list(uintptr_t value) {
311 return value & ~(uintptr_t)1u;
312 }
313
314 // There is a freelist of handles running through the JNIHandleBlock
315 // with a tagged next pointer, distinguishing these next pointers from
316 // oops. The freelist handling currently relies on the size of oops
317 // being the same as a native pointer. If this ever changes, then
318 // this freelist handling must change too.
319 STATIC_ASSERT(sizeof(oop) == sizeof(uintptr_t));
|
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/vmSymbols.hpp"
27 #include "gc/shared/collectedHeap.hpp"
28 #include "gc/shared/oopStorage.inline.hpp"
29 #include "gc/shared/oopStorageSet.hpp"
30 #include "logging/log.hpp"
31 #include "memory/iterator.hpp"
32 #include "memory/universe.hpp"
33 #include "oops/access.inline.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "runtime/handles.inline.hpp"
36 #include "runtime/javaCalls.hpp"
37 #include "runtime/javaThread.inline.hpp"
38 #include "runtime/jniHandles.inline.hpp"
39 #include "runtime/mutexLocker.hpp"
40 #include "utilities/align.hpp"
41 #include "utilities/debug.hpp"
42
43 OopStorage* JNIHandles::global_handles() {
44 return _global_handles;
45 }
46
47 OopStorage* JNIHandles::weak_global_handles() {
48 return _weak_global_handles;
49 }
50
51 // Serviceability agent support.
52 OopStorage* JNIHandles::_global_handles = NULL;
53 OopStorage* JNIHandles::_weak_global_handles = NULL;
54
55 void jni_handles_init() {
56 JNIHandles::_global_handles = OopStorageSet::create_strong("JNI Global", mtInternal);
282 guarantee(oopDesc::is_oop_or_null(RawAccess<>::oop_load(root)), "Invalid oop");
283 }
284 virtual void do_oop(narrowOop* root) { ShouldNotReachHere(); }
285 };
286
287 void JNIHandles::verify() {
288 VerifyJNIHandles verify_handle;
289
290 oops_do(&verify_handle);
291 weak_oops_do(&verify_handle);
292 }
293
294 // This method is implemented here to avoid circular includes between
295 // jniHandles.hpp and thread.hpp.
296 bool JNIHandles::current_thread_in_native() {
297 Thread* thread = Thread::current();
298 return (thread->is_Java_thread() &&
299 JavaThread::cast(thread)->thread_state() == _thread_in_native);
300 }
301
302 bool JNIHandles::is_same_object(jobject handle1, jobject handle2) {
303 oop obj1 = resolve_no_keepalive(handle1);
304 oop obj2 = resolve_no_keepalive(handle2);
305
306 bool ret = obj1 == obj2;
307
308 if (EnableValhalla) {
309 if (!ret && obj1 != NULL && obj2 != NULL && obj1->klass() == obj2->klass() && obj1->klass()->is_inline_klass()) {
310 // The two references are different, they are not null and they are both inline types,
311 // a full substitutability test is required, calling PrimitiveObjectMethods.isSubstitutable()
312 // (similarly to InterpreterRuntime::is_substitutable)
313 JavaThread* THREAD = JavaThread::current();
314 Handle ha(THREAD, obj1);
315 Handle hb(THREAD, obj2);
316 JavaValue result(T_BOOLEAN);
317 JavaCallArguments args;
318 args.push_oop(ha);
319 args.push_oop(hb);
320 methodHandle method(THREAD, Universe::is_substitutable_method());
321 JavaCalls::call(&result, method, &args, THREAD);
322 if (HAS_PENDING_EXCEPTION) {
323 // Something really bad happened because isSubstitutable() should not throw exceptions
324 // If it is an error, just let it propagate
325 // If it is an exception, wrap it into an InternalError
326 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
327 Handle e(THREAD, PENDING_EXCEPTION);
328 CLEAR_PENDING_EXCEPTION;
329 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in substitutability test", e, false);
330 }
331 }
332 ret = result.get_jboolean();
333 }
334 }
335
336 return ret;
337 }
338
339
340 int JNIHandleBlock::_blocks_allocated = 0;
341
342 static inline bool is_tagged_free_list(uintptr_t value) {
343 return (value & 1u) != 0;
344 }
345
346 static inline uintptr_t tag_free_list(uintptr_t value) {
347 return value | 1u;
348 }
349
350 static inline uintptr_t untag_free_list(uintptr_t value) {
351 return value & ~(uintptr_t)1u;
352 }
353
354 // There is a freelist of handles running through the JNIHandleBlock
355 // with a tagged next pointer, distinguishing these next pointers from
356 // oops. The freelist handling currently relies on the size of oops
357 // being the same as a native pointer. If this ever changes, then
358 // this freelist handling must change too.
359 STATIC_ASSERT(sizeof(oop) == sizeof(uintptr_t));
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