Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/jniHandles.cpp @ 881:16c930df1e9b
Merge
author | dcubed |
---|---|
date | Tue, 28 Jul 2009 13:50:07 -0600 |
parents | d1605aabd0a1 |
children | 4ce7240d622c |
rev | line source |
---|---|
0 | 1 /* |
196 | 2 * Copyright 1998-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_jniHandles.cpp.incl" | |
27 | |
28 | |
29 JNIHandleBlock* JNIHandles::_global_handles = NULL; | |
30 JNIHandleBlock* JNIHandles::_weak_global_handles = NULL; | |
31 oop JNIHandles::_deleted_handle = NULL; | |
32 | |
33 | |
34 jobject JNIHandles::make_local(oop obj) { | |
35 if (obj == NULL) { | |
36 return NULL; // ignore null handles | |
37 } else { | |
38 Thread* thread = Thread::current(); | |
39 assert(Universe::heap()->is_in_reserved(obj), "sanity check"); | |
40 return thread->active_handles()->allocate_handle(obj); | |
41 } | |
42 } | |
43 | |
44 | |
45 // optimized versions | |
46 | |
47 jobject JNIHandles::make_local(Thread* thread, oop obj) { | |
48 if (obj == NULL) { | |
49 return NULL; // ignore null handles | |
50 } else { | |
51 assert(Universe::heap()->is_in_reserved(obj), "sanity check"); | |
52 return thread->active_handles()->allocate_handle(obj); | |
53 } | |
54 } | |
55 | |
56 | |
57 jobject JNIHandles::make_local(JNIEnv* env, oop obj) { | |
58 if (obj == NULL) { | |
59 return NULL; // ignore null handles | |
60 } else { | |
61 JavaThread* thread = JavaThread::thread_from_jni_environment(env); | |
62 assert(Universe::heap()->is_in_reserved(obj), "sanity check"); | |
63 return thread->active_handles()->allocate_handle(obj); | |
64 } | |
65 } | |
66 | |
67 | |
68 jobject JNIHandles::make_global(Handle obj) { | |
69 jobject res = NULL; | |
70 if (!obj.is_null()) { | |
71 // ignore null handles | |
72 MutexLocker ml(JNIGlobalHandle_lock); | |
73 assert(Universe::heap()->is_in_reserved(obj()), "sanity check"); | |
74 res = _global_handles->allocate_handle(obj()); | |
75 } else { | |
76 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
77 } | |
78 | |
79 return res; | |
80 } | |
81 | |
82 | |
83 jobject JNIHandles::make_weak_global(Handle obj) { | |
84 jobject res = NULL; | |
85 if (!obj.is_null()) { | |
86 // ignore null handles | |
87 MutexLocker ml(JNIGlobalHandle_lock); | |
88 assert(Universe::heap()->is_in_reserved(obj()), "sanity check"); | |
89 res = _weak_global_handles->allocate_handle(obj()); | |
90 } else { | |
91 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
92 } | |
93 return res; | |
94 } | |
95 | |
96 jmethodID JNIHandles::make_jmethod_id(methodHandle mh) { | |
97 return (jmethodID) make_weak_global(mh); | |
98 } | |
99 | |
100 | |
101 | |
102 void JNIHandles::change_method_associated_with_jmethod_id(jmethodID jmid, methodHandle mh) { | |
103 MutexLocker ml(JNIGlobalHandle_lock); // Is this necessary? | |
104 Handle obj = (Handle)mh; | |
105 oop* jobj = (oop*)jmid; | |
106 *jobj = obj(); | |
107 } | |
108 | |
109 | |
110 void JNIHandles::destroy_global(jobject handle) { | |
111 if (handle != NULL) { | |
112 assert(is_global_handle(handle), "Invalid delete of global JNI handle"); | |
113 *((oop*)handle) = deleted_handle(); // Mark the handle as deleted, allocate will reuse it | |
114 } | |
115 } | |
116 | |
117 | |
118 void JNIHandles::destroy_weak_global(jobject handle) { | |
119 if (handle != NULL) { | |
120 assert(!CheckJNICalls || is_weak_global_handle(handle), "Invalid delete of weak global JNI handle"); | |
121 *((oop*)handle) = deleted_handle(); // Mark the handle as deleted, allocate will reuse it | |
122 } | |
123 } | |
124 | |
125 void JNIHandles::destroy_jmethod_id(jmethodID mid) { | |
126 destroy_weak_global((jobject)mid); | |
127 } | |
128 | |
129 | |
130 void JNIHandles::oops_do(OopClosure* f) { | |
131 f->do_oop(&_deleted_handle); | |
132 _global_handles->oops_do(f); | |
133 } | |
134 | |
135 | |
136 void JNIHandles::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f) { | |
137 _weak_global_handles->weak_oops_do(is_alive, f); | |
138 } | |
139 | |
140 | |
141 void JNIHandles::initialize() { | |
142 _global_handles = JNIHandleBlock::allocate_block(); | |
143 _weak_global_handles = JNIHandleBlock::allocate_block(); | |
144 EXCEPTION_MARK; | |
145 // We will never reach the CATCH below since Exceptions::_throw will cause | |
146 // the VM to exit if an exception is thrown during initialization | |
147 klassOop k = SystemDictionary::object_klass(); | |
148 _deleted_handle = instanceKlass::cast(k)->allocate_permanent_instance(CATCH); | |
149 } | |
150 | |
151 | |
152 bool JNIHandles::is_local_handle(Thread* thread, jobject handle) { | |
153 JNIHandleBlock* block = thread->active_handles(); | |
154 | |
155 // Look back past possible native calls to jni_PushLocalFrame. | |
156 while (block != NULL) { | |
157 if (block->chain_contains(handle)) { | |
158 return true; | |
159 } | |
160 block = block->pop_frame_link(); | |
161 } | |
162 return false; | |
163 } | |
164 | |
165 | |
166 // Determine if the handle is somewhere in the current thread's stack. | |
167 // We easily can't isolate any particular stack frame the handle might | |
168 // come from, so we'll check the whole stack. | |
169 | |
170 bool JNIHandles::is_frame_handle(JavaThread* thr, jobject obj) { | |
171 // If there is no java frame, then this must be top level code, such | |
172 // as the java command executable, in which case, this type of handle | |
173 // is not permitted. | |
174 return (thr->has_last_Java_frame() && | |
175 (void*)obj < (void*)thr->stack_base() && | |
176 (void*)obj >= (void*)thr->last_Java_sp()); | |
177 } | |
178 | |
179 | |
180 bool JNIHandles::is_global_handle(jobject handle) { | |
181 return _global_handles->chain_contains(handle); | |
182 } | |
183 | |
184 | |
185 bool JNIHandles::is_weak_global_handle(jobject handle) { | |
186 return _weak_global_handles->chain_contains(handle); | |
187 } | |
188 | |
189 long JNIHandles::global_handle_memory_usage() { | |
190 return _global_handles->memory_usage(); | |
191 } | |
192 | |
193 long JNIHandles::weak_global_handle_memory_usage() { | |
194 return _weak_global_handles->memory_usage(); | |
195 } | |
196 | |
197 | |
198 class AlwaysAliveClosure: public BoolObjectClosure { | |
199 public: | |
200 bool do_object_b(oop obj) { return true; } | |
201 void do_object(oop obj) { assert(false, "Don't call"); } | |
202 }; | |
203 | |
204 class CountHandleClosure: public OopClosure { | |
205 private: | |
206 int _count; | |
207 public: | |
208 CountHandleClosure(): _count(0) {} | |
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209 virtual void do_oop(oop* unused) { |
0 | 210 _count++; |
211 } | |
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212 virtual void do_oop(narrowOop* unused) { ShouldNotReachHere(); } |
0 | 213 int count() { return _count; } |
214 }; | |
215 | |
216 // We assume this is called at a safepoint: no lock is needed. | |
217 void JNIHandles::print_on(outputStream* st) { | |
218 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
219 assert(_global_handles != NULL && _weak_global_handles != NULL, | |
220 "JNIHandles not initialized"); | |
221 | |
222 CountHandleClosure global_handle_count; | |
223 AlwaysAliveClosure always_alive; | |
224 oops_do(&global_handle_count); | |
225 weak_oops_do(&always_alive, &global_handle_count); | |
226 | |
227 st->print_cr("JNI global references: %d", global_handle_count.count()); | |
228 st->cr(); | |
229 st->flush(); | |
230 } | |
231 | |
232 class VerifyHandleClosure: public OopClosure { | |
233 public: | |
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234 virtual void do_oop(oop* root) { |
0 | 235 (*root)->verify(); |
236 } | |
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237 virtual void do_oop(narrowOop* root) { ShouldNotReachHere(); } |
0 | 238 }; |
239 | |
240 void JNIHandles::verify() { | |
241 VerifyHandleClosure verify_handle; | |
242 AlwaysAliveClosure always_alive; | |
243 | |
244 oops_do(&verify_handle); | |
245 weak_oops_do(&always_alive, &verify_handle); | |
246 } | |
247 | |
248 | |
249 | |
250 void jni_handles_init() { | |
251 JNIHandles::initialize(); | |
252 } | |
253 | |
254 | |
255 int JNIHandleBlock::_blocks_allocated = 0; | |
256 JNIHandleBlock* JNIHandleBlock::_block_free_list = NULL; | |
257 #ifndef PRODUCT | |
258 JNIHandleBlock* JNIHandleBlock::_block_list = NULL; | |
259 #endif | |
260 | |
261 | |
262 void JNIHandleBlock::zap() { | |
263 // Zap block values | |
264 _top = 0; | |
265 for (int index = 0; index < block_size_in_oops; index++) { | |
266 _handles[index] = badJNIHandle; | |
267 } | |
268 } | |
269 | |
270 JNIHandleBlock* JNIHandleBlock::allocate_block(Thread* thread) { | |
271 assert(thread == NULL || thread == Thread::current(), "sanity check"); | |
272 JNIHandleBlock* block; | |
273 // Check the thread-local free list for a block so we don't | |
274 // have to acquire a mutex. | |
275 if (thread != NULL && thread->free_handle_block() != NULL) { | |
276 block = thread->free_handle_block(); | |
277 thread->set_free_handle_block(block->_next); | |
278 } | |
279 else { | |
280 // locking with safepoint checking introduces a potential deadlock: | |
281 // - we would hold JNIHandleBlockFreeList_lock and then Threads_lock | |
282 // - another would hold Threads_lock (jni_AttachCurrentThread) and then | |
283 // JNIHandleBlockFreeList_lock (JNIHandleBlock::allocate_block) | |
284 MutexLockerEx ml(JNIHandleBlockFreeList_lock, | |
285 Mutex::_no_safepoint_check_flag); | |
286 if (_block_free_list == NULL) { | |
287 // Allocate new block | |
288 block = new JNIHandleBlock(); | |
289 _blocks_allocated++; | |
290 if (TraceJNIHandleAllocation) { | |
291 tty->print_cr("JNIHandleBlock " INTPTR_FORMAT " allocated (%d total blocks)", | |
292 block, _blocks_allocated); | |
293 } | |
294 if (ZapJNIHandleArea) block->zap(); | |
295 #ifndef PRODUCT | |
296 // Link new block to list of all allocated blocks | |
297 block->_block_list_link = _block_list; | |
298 _block_list = block; | |
299 #endif | |
300 } else { | |
301 // Get block from free list | |
302 block = _block_free_list; | |
303 _block_free_list = _block_free_list->_next; | |
304 } | |
305 } | |
306 block->_top = 0; | |
307 block->_next = NULL; | |
308 block->_pop_frame_link = NULL; | |
309 // _last, _free_list & _allocate_before_rebuild initialized in allocate_handle | |
310 debug_only(block->_last = NULL); | |
311 debug_only(block->_free_list = NULL); | |
312 debug_only(block->_allocate_before_rebuild = -1); | |
313 return block; | |
314 } | |
315 | |
316 | |
317 void JNIHandleBlock::release_block(JNIHandleBlock* block, Thread* thread) { | |
318 assert(thread == NULL || thread == Thread::current(), "sanity check"); | |
319 JNIHandleBlock* pop_frame_link = block->pop_frame_link(); | |
320 // Put returned block at the beginning of the thread-local free list. | |
321 // Note that if thread == NULL, we use it as an implicit argument that | |
322 // we _don't_ want the block to be kept on the free_handle_block. | |
323 // See for instance JavaThread::exit(). | |
324 if (thread != NULL ) { | |
325 if (ZapJNIHandleArea) block->zap(); | |
326 JNIHandleBlock* freelist = thread->free_handle_block(); | |
327 block->_pop_frame_link = NULL; | |
328 thread->set_free_handle_block(block); | |
329 | |
330 // Add original freelist to end of chain | |
331 if ( freelist != NULL ) { | |
332 while ( block->_next != NULL ) block = block->_next; | |
333 block->_next = freelist; | |
334 } | |
335 block = NULL; | |
336 } | |
337 if (block != NULL) { | |
338 // Return blocks to free list | |
339 // locking with safepoint checking introduces a potential deadlock: | |
340 // - we would hold JNIHandleBlockFreeList_lock and then Threads_lock | |
341 // - another would hold Threads_lock (jni_AttachCurrentThread) and then | |
342 // JNIHandleBlockFreeList_lock (JNIHandleBlock::allocate_block) | |
343 MutexLockerEx ml(JNIHandleBlockFreeList_lock, | |
344 Mutex::_no_safepoint_check_flag); | |
345 while (block != NULL) { | |
346 if (ZapJNIHandleArea) block->zap(); | |
347 JNIHandleBlock* next = block->_next; | |
348 block->_next = _block_free_list; | |
349 _block_free_list = block; | |
350 block = next; | |
351 } | |
352 } | |
353 if (pop_frame_link != NULL) { | |
354 // As a sanity check we release blocks pointed to by the pop_frame_link. | |
355 // This should never happen (only if PopLocalFrame is not called the | |
356 // correct number of times). | |
357 release_block(pop_frame_link, thread); | |
358 } | |
359 } | |
360 | |
361 | |
362 void JNIHandleBlock::oops_do(OopClosure* f) { | |
363 JNIHandleBlock* current_chain = this; | |
364 // Iterate over chain of blocks, followed by chains linked through the | |
365 // pop frame links. | |
366 while (current_chain != NULL) { | |
367 for (JNIHandleBlock* current = current_chain; current != NULL; | |
368 current = current->_next) { | |
369 assert(current == current_chain || current->pop_frame_link() == NULL, | |
370 "only blocks first in chain should have pop frame link set"); | |
371 for (int index = 0; index < current->_top; index++) { | |
372 oop* root = &(current->_handles)[index]; | |
373 oop value = *root; | |
374 // traverse heap pointers only, not deleted handles or free list | |
375 // pointers | |
376 if (value != NULL && Universe::heap()->is_in_reserved(value)) { | |
377 f->do_oop(root); | |
378 } | |
379 } | |
380 // the next handle block is valid only if current block is full | |
381 if (current->_top < block_size_in_oops) { | |
382 break; | |
383 } | |
384 } | |
385 current_chain = current_chain->pop_frame_link(); | |
386 } | |
387 } | |
388 | |
389 | |
390 void JNIHandleBlock::weak_oops_do(BoolObjectClosure* is_alive, | |
391 OopClosure* f) { | |
392 for (JNIHandleBlock* current = this; current != NULL; current = current->_next) { | |
393 assert(current->pop_frame_link() == NULL, | |
394 "blocks holding weak global JNI handles should not have pop frame link set"); | |
395 for (int index = 0; index < current->_top; index++) { | |
396 oop* root = &(current->_handles)[index]; | |
397 oop value = *root; | |
398 // traverse heap pointers only, not deleted handles or free list pointers | |
399 if (value != NULL && Universe::heap()->is_in_reserved(value)) { | |
400 if (is_alive->do_object_b(value)) { | |
401 // The weakly referenced object is alive, update pointer | |
402 f->do_oop(root); | |
403 } else { | |
404 // The weakly referenced object is not alive, clear the reference by storing NULL | |
405 if (TraceReferenceGC) { | |
406 tty->print_cr("Clearing JNI weak reference (" INTPTR_FORMAT ")", root); | |
407 } | |
408 *root = NULL; | |
409 } | |
410 } | |
411 } | |
412 // the next handle block is valid only if current block is full | |
413 if (current->_top < block_size_in_oops) { | |
414 break; | |
415 } | |
416 } | |
417 } | |
418 | |
419 | |
420 jobject JNIHandleBlock::allocate_handle(oop obj) { | |
421 assert(Universe::heap()->is_in_reserved(obj), "sanity check"); | |
422 if (_top == 0) { | |
423 // This is the first allocation or the initial block got zapped when | |
424 // entering a native function. If we have any following blocks they are | |
425 // not valid anymore. | |
426 for (JNIHandleBlock* current = _next; current != NULL; | |
427 current = current->_next) { | |
428 assert(current->_last == NULL, "only first block should have _last set"); | |
429 assert(current->_free_list == NULL, | |
430 "only first block should have _free_list set"); | |
431 current->_top = 0; | |
432 if (ZapJNIHandleArea) current->zap(); | |
433 } | |
434 // Clear initial block | |
435 _free_list = NULL; | |
436 _allocate_before_rebuild = 0; | |
437 _last = this; | |
438 if (ZapJNIHandleArea) zap(); | |
439 } | |
440 | |
441 // Try last block | |
442 if (_last->_top < block_size_in_oops) { | |
443 oop* handle = &(_last->_handles)[_last->_top++]; | |
444 *handle = obj; | |
445 return (jobject) handle; | |
446 } | |
447 | |
448 // Try free list | |
449 if (_free_list != NULL) { | |
450 oop* handle = _free_list; | |
451 _free_list = (oop*) *_free_list; | |
452 *handle = obj; | |
453 return (jobject) handle; | |
454 } | |
455 // Check if unused block follow last | |
456 if (_last->_next != NULL) { | |
457 // update last and retry | |
458 _last = _last->_next; | |
459 return allocate_handle(obj); | |
460 } | |
461 | |
462 // No space available, we have to rebuild free list or expand | |
463 if (_allocate_before_rebuild == 0) { | |
464 rebuild_free_list(); // updates _allocate_before_rebuild counter | |
465 } else { | |
466 // Append new block | |
467 Thread* thread = Thread::current(); | |
468 Handle obj_handle(thread, obj); | |
469 // This can block, so we need to preserve obj accross call. | |
470 _last->_next = JNIHandleBlock::allocate_block(thread); | |
471 _last = _last->_next; | |
472 _allocate_before_rebuild--; | |
473 obj = obj_handle(); | |
474 } | |
475 return allocate_handle(obj); // retry | |
476 } | |
477 | |
478 | |
479 void JNIHandleBlock::rebuild_free_list() { | |
480 assert(_allocate_before_rebuild == 0 && _free_list == NULL, "just checking"); | |
481 int free = 0; | |
482 int blocks = 0; | |
483 for (JNIHandleBlock* current = this; current != NULL; current = current->_next) { | |
484 for (int index = 0; index < current->_top; index++) { | |
485 oop* handle = &(current->_handles)[index]; | |
486 if (*handle == JNIHandles::deleted_handle()) { | |
487 // this handle was cleared out by a delete call, reuse it | |
488 *handle = (oop) _free_list; | |
489 _free_list = handle; | |
490 free++; | |
491 } | |
492 } | |
493 // we should not rebuild free list if there are unused handles at the end | |
494 assert(current->_top == block_size_in_oops, "just checking"); | |
495 blocks++; | |
496 } | |
497 // Heuristic: if more than half of the handles are free we rebuild next time | |
498 // as well, otherwise we append a corresponding number of new blocks before | |
499 // attempting a free list rebuild again. | |
500 int total = blocks * block_size_in_oops; | |
501 int extra = total - 2*free; | |
502 if (extra > 0) { | |
503 // Not as many free handles as we would like - compute number of new blocks to append | |
504 _allocate_before_rebuild = (extra + block_size_in_oops - 1) / block_size_in_oops; | |
505 } | |
506 if (TraceJNIHandleAllocation) { | |
507 tty->print_cr("Rebuild free list JNIHandleBlock " INTPTR_FORMAT " blocks=%d used=%d free=%d add=%d", | |
508 this, blocks, total-free, free, _allocate_before_rebuild); | |
509 } | |
510 } | |
511 | |
512 | |
513 bool JNIHandleBlock::contains(jobject handle) const { | |
514 return ((jobject)&_handles[0] <= handle && handle<(jobject)&_handles[_top]); | |
515 } | |
516 | |
517 | |
518 bool JNIHandleBlock::chain_contains(jobject handle) const { | |
519 for (JNIHandleBlock* current = (JNIHandleBlock*) this; current != NULL; current = current->_next) { | |
520 if (current->contains(handle)) { | |
521 return true; | |
522 } | |
523 } | |
524 return false; | |
525 } | |
526 | |
527 | |
528 int JNIHandleBlock::length() const { | |
529 int result = 1; | |
530 for (JNIHandleBlock* current = _next; current != NULL; current = current->_next) { | |
531 result++; | |
532 } | |
533 return result; | |
534 } | |
535 | |
536 // This method is not thread-safe, i.e., must be called whule holding a lock on the | |
537 // structure. | |
538 long JNIHandleBlock::memory_usage() const { | |
539 return length() * sizeof(JNIHandleBlock); | |
540 } | |
541 | |
542 | |
543 #ifndef PRODUCT | |
544 | |
545 bool JNIHandleBlock::any_contains(jobject handle) { | |
546 for (JNIHandleBlock* current = _block_list; current != NULL; current = current->_block_list_link) { | |
547 if (current->contains(handle)) { | |
548 return true; | |
549 } | |
550 } | |
551 return false; | |
552 } | |
553 | |
554 void JNIHandleBlock::print_statistics() { | |
555 int used_blocks = 0; | |
556 int free_blocks = 0; | |
557 int used_handles = 0; | |
558 int free_handles = 0; | |
559 JNIHandleBlock* block = _block_list; | |
560 while (block != NULL) { | |
561 if (block->_top > 0) { | |
562 used_blocks++; | |
563 } else { | |
564 free_blocks++; | |
565 } | |
566 used_handles += block->_top; | |
567 free_handles += (block_size_in_oops - block->_top); | |
568 block = block->_block_list_link; | |
569 } | |
570 tty->print_cr("JNIHandleBlocks statistics"); | |
571 tty->print_cr("- blocks allocated: %d", used_blocks + free_blocks); | |
572 tty->print_cr("- blocks in use: %d", used_blocks); | |
573 tty->print_cr("- blocks free: %d", free_blocks); | |
574 tty->print_cr("- handles in use: %d", used_handles); | |
575 tty->print_cr("- handles free: %d", free_handles); | |
576 } | |
577 | |
578 #endif |