Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiImpl.cpp @ 3187:6ff76a1b8339
The benchmark tool should now print zero values to the csv file, if a benchmark fails
author | Josef Haider <josef.haider@khg.jku.at> |
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date | Thu, 07 Jul 2011 19:43:17 +0200 |
parents | 46a56fac55c7 |
children | 0cddebc420d8 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/systemDictionary.hpp" | |
27 #include "interpreter/interpreter.hpp" | |
28 #include "jvmtifiles/jvmtiEnv.hpp" | |
29 #include "memory/resourceArea.hpp" | |
30 #include "oops/instanceKlass.hpp" | |
31 #include "prims/jvmtiAgentThread.hpp" | |
32 #include "prims/jvmtiEventController.inline.hpp" | |
33 #include "prims/jvmtiImpl.hpp" | |
34 #include "prims/jvmtiRedefineClasses.hpp" | |
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35 #include "runtime/atomic.hpp" |
1972 | 36 #include "runtime/deoptimization.hpp" |
37 #include "runtime/handles.hpp" | |
38 #include "runtime/handles.inline.hpp" | |
39 #include "runtime/interfaceSupport.hpp" | |
40 #include "runtime/javaCalls.hpp" | |
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41 #include "runtime/serviceThread.hpp" |
1972 | 42 #include "runtime/signature.hpp" |
43 #include "runtime/vframe.hpp" | |
44 #include "runtime/vframe_hp.hpp" | |
45 #include "runtime/vm_operations.hpp" | |
46 #include "utilities/exceptions.hpp" | |
47 #ifdef TARGET_OS_FAMILY_linux | |
48 # include "thread_linux.inline.hpp" | |
49 #endif | |
50 #ifdef TARGET_OS_FAMILY_solaris | |
51 # include "thread_solaris.inline.hpp" | |
52 #endif | |
53 #ifdef TARGET_OS_FAMILY_windows | |
54 # include "thread_windows.inline.hpp" | |
55 #endif | |
0 | 56 |
57 // | |
58 // class JvmtiAgentThread | |
59 // | |
60 // JavaThread used to wrap a thread started by an agent | |
61 // using the JVMTI method RunAgentThread. | |
62 // | |
63 | |
64 JvmtiAgentThread::JvmtiAgentThread(JvmtiEnv* env, jvmtiStartFunction start_fn, const void *start_arg) | |
65 : JavaThread(start_function_wrapper) { | |
66 _env = env; | |
67 _start_fn = start_fn; | |
68 _start_arg = start_arg; | |
69 } | |
70 | |
71 void | |
72 JvmtiAgentThread::start_function_wrapper(JavaThread *thread, TRAPS) { | |
73 // It is expected that any Agent threads will be created as | |
74 // Java Threads. If this is the case, notification of the creation | |
75 // of the thread is given in JavaThread::thread_main(). | |
76 assert(thread->is_Java_thread(), "debugger thread should be a Java Thread"); | |
77 assert(thread == JavaThread::current(), "sanity check"); | |
78 | |
79 JvmtiAgentThread *dthread = (JvmtiAgentThread *)thread; | |
80 dthread->call_start_function(); | |
81 } | |
82 | |
83 void | |
84 JvmtiAgentThread::call_start_function() { | |
85 ThreadToNativeFromVM transition(this); | |
86 _start_fn(_env->jvmti_external(), jni_environment(), (void*)_start_arg); | |
87 } | |
88 | |
89 | |
90 // | |
91 // class GrowableCache - private methods | |
92 // | |
93 | |
94 void GrowableCache::recache() { | |
95 int len = _elements->length(); | |
96 | |
97 FREE_C_HEAP_ARRAY(address, _cache); | |
98 _cache = NEW_C_HEAP_ARRAY(address,len+1); | |
99 | |
100 for (int i=0; i<len; i++) { | |
101 _cache[i] = _elements->at(i)->getCacheValue(); | |
102 // | |
103 // The cache entry has gone bad. Without a valid frame pointer | |
104 // value, the entry is useless so we simply delete it in product | |
105 // mode. The call to remove() will rebuild the cache again | |
106 // without the bad entry. | |
107 // | |
108 if (_cache[i] == NULL) { | |
109 assert(false, "cannot recache NULL elements"); | |
110 remove(i); | |
111 return; | |
112 } | |
113 } | |
114 _cache[len] = NULL; | |
115 | |
116 _listener_fun(_this_obj,_cache); | |
117 } | |
118 | |
119 bool GrowableCache::equals(void* v, GrowableElement *e2) { | |
120 GrowableElement *e1 = (GrowableElement *) v; | |
121 assert(e1 != NULL, "e1 != NULL"); | |
122 assert(e2 != NULL, "e2 != NULL"); | |
123 | |
124 return e1->equals(e2); | |
125 } | |
126 | |
127 // | |
128 // class GrowableCache - public methods | |
129 // | |
130 | |
131 GrowableCache::GrowableCache() { | |
132 _this_obj = NULL; | |
133 _listener_fun = NULL; | |
134 _elements = NULL; | |
135 _cache = NULL; | |
136 } | |
137 | |
138 GrowableCache::~GrowableCache() { | |
139 clear(); | |
140 delete _elements; | |
141 FREE_C_HEAP_ARRAY(address, _cache); | |
142 } | |
143 | |
144 void GrowableCache::initialize(void *this_obj, void listener_fun(void *, address*) ) { | |
145 _this_obj = this_obj; | |
146 _listener_fun = listener_fun; | |
147 _elements = new (ResourceObj::C_HEAP) GrowableArray<GrowableElement*>(5,true); | |
148 recache(); | |
149 } | |
150 | |
151 // number of elements in the collection | |
152 int GrowableCache::length() { | |
153 return _elements->length(); | |
154 } | |
155 | |
156 // get the value of the index element in the collection | |
157 GrowableElement* GrowableCache::at(int index) { | |
158 GrowableElement *e = (GrowableElement *) _elements->at(index); | |
159 assert(e != NULL, "e != NULL"); | |
160 return e; | |
161 } | |
162 | |
163 int GrowableCache::find(GrowableElement* e) { | |
164 return _elements->find(e, GrowableCache::equals); | |
165 } | |
166 | |
167 // append a copy of the element to the end of the collection | |
168 void GrowableCache::append(GrowableElement* e) { | |
169 GrowableElement *new_e = e->clone(); | |
170 _elements->append(new_e); | |
171 recache(); | |
172 } | |
173 | |
174 // insert a copy of the element using lessthan() | |
175 void GrowableCache::insert(GrowableElement* e) { | |
176 GrowableElement *new_e = e->clone(); | |
177 _elements->append(new_e); | |
178 | |
179 int n = length()-2; | |
180 for (int i=n; i>=0; i--) { | |
181 GrowableElement *e1 = _elements->at(i); | |
182 GrowableElement *e2 = _elements->at(i+1); | |
183 if (e2->lessThan(e1)) { | |
184 _elements->at_put(i+1, e1); | |
185 _elements->at_put(i, e2); | |
186 } | |
187 } | |
188 | |
189 recache(); | |
190 } | |
191 | |
192 // remove the element at index | |
193 void GrowableCache::remove (int index) { | |
194 GrowableElement *e = _elements->at(index); | |
195 assert(e != NULL, "e != NULL"); | |
196 _elements->remove(e); | |
197 delete e; | |
198 recache(); | |
199 } | |
200 | |
201 // clear out all elements, release all heap space and | |
202 // let our listener know that things have changed. | |
203 void GrowableCache::clear() { | |
204 int len = _elements->length(); | |
205 for (int i=0; i<len; i++) { | |
206 delete _elements->at(i); | |
207 } | |
208 _elements->clear(); | |
209 recache(); | |
210 } | |
211 | |
212 void GrowableCache::oops_do(OopClosure* f) { | |
213 int len = _elements->length(); | |
214 for (int i=0; i<len; i++) { | |
215 GrowableElement *e = _elements->at(i); | |
216 e->oops_do(f); | |
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217 } |
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218 } |
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219 |
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220 void GrowableCache::gc_epilogue() { |
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221 int len = _elements->length(); |
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222 for (int i=0; i<len; i++) { |
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223 _cache[i] = _elements->at(i)->getCacheValue(); |
0 | 224 } |
225 } | |
226 | |
227 // | |
228 // class JvmtiBreakpoint | |
229 // | |
230 | |
231 JvmtiBreakpoint::JvmtiBreakpoint() { | |
232 _method = NULL; | |
233 _bci = 0; | |
234 #ifdef CHECK_UNHANDLED_OOPS | |
235 // This one is always allocated with new, but check it just in case. | |
236 Thread *thread = Thread::current(); | |
237 if (thread->is_in_stack((address)&_method)) { | |
238 thread->allow_unhandled_oop((oop*)&_method); | |
239 } | |
240 #endif // CHECK_UNHANDLED_OOPS | |
241 } | |
242 | |
243 JvmtiBreakpoint::JvmtiBreakpoint(methodOop m_method, jlocation location) { | |
244 _method = m_method; | |
245 assert(_method != NULL, "_method != NULL"); | |
246 _bci = (int) location; | |
247 #ifdef CHECK_UNHANDLED_OOPS | |
248 // Could be allocated with new and wouldn't be on the unhandled oop list. | |
249 Thread *thread = Thread::current(); | |
250 if (thread->is_in_stack((address)&_method)) { | |
251 thread->allow_unhandled_oop(&_method); | |
252 } | |
253 #endif // CHECK_UNHANDLED_OOPS | |
254 | |
255 assert(_bci >= 0, "_bci >= 0"); | |
256 } | |
257 | |
258 void JvmtiBreakpoint::copy(JvmtiBreakpoint& bp) { | |
259 _method = bp._method; | |
260 _bci = bp._bci; | |
261 } | |
262 | |
263 bool JvmtiBreakpoint::lessThan(JvmtiBreakpoint& bp) { | |
264 Unimplemented(); | |
265 return false; | |
266 } | |
267 | |
268 bool JvmtiBreakpoint::equals(JvmtiBreakpoint& bp) { | |
269 return _method == bp._method | |
270 && _bci == bp._bci; | |
271 } | |
272 | |
273 bool JvmtiBreakpoint::is_valid() { | |
274 return _method != NULL && | |
275 _bci >= 0; | |
276 } | |
277 | |
278 address JvmtiBreakpoint::getBcp() { | |
279 return _method->bcp_from(_bci); | |
280 } | |
281 | |
282 void JvmtiBreakpoint::each_method_version_do(method_action meth_act) { | |
283 ((methodOopDesc*)_method->*meth_act)(_bci); | |
284 | |
285 // add/remove breakpoint to/from versions of the method that | |
286 // are EMCP. Directly or transitively obsolete methods are | |
287 // not saved in the PreviousVersionInfo. | |
288 Thread *thread = Thread::current(); | |
289 instanceKlassHandle ikh = instanceKlassHandle(thread, _method->method_holder()); | |
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290 Symbol* m_name = _method->name(); |
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291 Symbol* m_signature = _method->signature(); |
0 | 292 |
293 { | |
294 ResourceMark rm(thread); | |
295 // PreviousVersionInfo objects returned via PreviousVersionWalker | |
296 // contain a GrowableArray of handles. We have to clean up the | |
297 // GrowableArray _after_ the PreviousVersionWalker destructor | |
298 // has destroyed the handles. | |
299 { | |
300 // search previous versions if they exist | |
301 PreviousVersionWalker pvw((instanceKlass *)ikh()->klass_part()); | |
302 for (PreviousVersionInfo * pv_info = pvw.next_previous_version(); | |
303 pv_info != NULL; pv_info = pvw.next_previous_version()) { | |
304 GrowableArray<methodHandle>* methods = | |
305 pv_info->prev_EMCP_method_handles(); | |
306 | |
307 if (methods == NULL) { | |
308 // We have run into a PreviousVersion generation where | |
309 // all methods were made obsolete during that generation's | |
310 // RedefineClasses() operation. At the time of that | |
311 // operation, all EMCP methods were flushed so we don't | |
312 // have to go back any further. | |
313 // | |
314 // A NULL methods array is different than an empty methods | |
315 // array. We cannot infer any optimizations about older | |
316 // generations from an empty methods array for the current | |
317 // generation. | |
318 break; | |
319 } | |
320 | |
321 for (int i = methods->length() - 1; i >= 0; i--) { | |
322 methodHandle method = methods->at(i); | |
323 if (method->name() == m_name && method->signature() == m_signature) { | |
324 RC_TRACE(0x00000800, ("%sing breakpoint in %s(%s)", | |
325 meth_act == &methodOopDesc::set_breakpoint ? "sett" : "clear", | |
326 method->name()->as_C_string(), | |
327 method->signature()->as_C_string())); | |
328 assert(!method->is_obsolete(), "only EMCP methods here"); | |
329 | |
330 ((methodOopDesc*)method()->*meth_act)(_bci); | |
331 break; | |
332 } | |
333 } | |
334 } | |
335 } // pvw is cleaned up | |
336 } // rm is cleaned up | |
337 } | |
338 | |
339 void JvmtiBreakpoint::set() { | |
340 each_method_version_do(&methodOopDesc::set_breakpoint); | |
341 } | |
342 | |
343 void JvmtiBreakpoint::clear() { | |
344 each_method_version_do(&methodOopDesc::clear_breakpoint); | |
345 } | |
346 | |
347 void JvmtiBreakpoint::print() { | |
348 #ifndef PRODUCT | |
349 const char *class_name = (_method == NULL) ? "NULL" : _method->klass_name()->as_C_string(); | |
350 const char *method_name = (_method == NULL) ? "NULL" : _method->name()->as_C_string(); | |
351 | |
352 tty->print("Breakpoint(%s,%s,%d,%p)",class_name, method_name, _bci, getBcp()); | |
353 #endif | |
354 } | |
355 | |
356 | |
357 // | |
358 // class VM_ChangeBreakpoints | |
359 // | |
360 // Modify the Breakpoints data structure at a safepoint | |
361 // | |
362 | |
363 void VM_ChangeBreakpoints::doit() { | |
364 switch (_operation) { | |
365 case SET_BREAKPOINT: | |
366 _breakpoints->set_at_safepoint(*_bp); | |
367 break; | |
368 case CLEAR_BREAKPOINT: | |
369 _breakpoints->clear_at_safepoint(*_bp); | |
370 break; | |
371 case CLEAR_ALL_BREAKPOINT: | |
372 _breakpoints->clearall_at_safepoint(); | |
373 break; | |
374 default: | |
375 assert(false, "Unknown operation"); | |
376 } | |
377 } | |
378 | |
379 void VM_ChangeBreakpoints::oops_do(OopClosure* f) { | |
380 // This operation keeps breakpoints alive | |
381 if (_breakpoints != NULL) { | |
382 _breakpoints->oops_do(f); | |
383 } | |
384 if (_bp != NULL) { | |
385 _bp->oops_do(f); | |
386 } | |
387 } | |
388 | |
389 // | |
390 // class JvmtiBreakpoints | |
391 // | |
392 // a JVMTI internal collection of JvmtiBreakpoint | |
393 // | |
394 | |
395 JvmtiBreakpoints::JvmtiBreakpoints(void listener_fun(void *,address *)) { | |
396 _bps.initialize(this,listener_fun); | |
397 } | |
398 | |
399 JvmtiBreakpoints:: ~JvmtiBreakpoints() {} | |
400 | |
401 void JvmtiBreakpoints::oops_do(OopClosure* f) { | |
402 _bps.oops_do(f); | |
403 } | |
404 | |
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405 void JvmtiBreakpoints::gc_epilogue() { |
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406 _bps.gc_epilogue(); |
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407 } |
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408 |
0 | 409 void JvmtiBreakpoints::print() { |
410 #ifndef PRODUCT | |
411 ResourceMark rm; | |
412 | |
413 int n = _bps.length(); | |
414 for (int i=0; i<n; i++) { | |
415 JvmtiBreakpoint& bp = _bps.at(i); | |
416 tty->print("%d: ", i); | |
417 bp.print(); | |
418 tty->print_cr(""); | |
419 } | |
420 #endif | |
421 } | |
422 | |
423 | |
424 void JvmtiBreakpoints::set_at_safepoint(JvmtiBreakpoint& bp) { | |
425 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
426 | |
427 int i = _bps.find(bp); | |
428 if (i == -1) { | |
429 _bps.append(bp); | |
430 bp.set(); | |
431 } | |
432 } | |
433 | |
434 void JvmtiBreakpoints::clear_at_safepoint(JvmtiBreakpoint& bp) { | |
435 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
436 | |
437 int i = _bps.find(bp); | |
438 if (i != -1) { | |
439 _bps.remove(i); | |
440 bp.clear(); | |
441 } | |
442 } | |
443 | |
444 void JvmtiBreakpoints::clearall_at_safepoint() { | |
445 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
446 | |
447 int len = _bps.length(); | |
448 for (int i=0; i<len; i++) { | |
449 _bps.at(i).clear(); | |
450 } | |
451 _bps.clear(); | |
452 } | |
453 | |
454 int JvmtiBreakpoints::length() { return _bps.length(); } | |
455 | |
456 int JvmtiBreakpoints::set(JvmtiBreakpoint& bp) { | |
457 if ( _bps.find(bp) != -1) { | |
458 return JVMTI_ERROR_DUPLICATE; | |
459 } | |
460 VM_ChangeBreakpoints set_breakpoint(this,VM_ChangeBreakpoints::SET_BREAKPOINT, &bp); | |
461 VMThread::execute(&set_breakpoint); | |
462 return JVMTI_ERROR_NONE; | |
463 } | |
464 | |
465 int JvmtiBreakpoints::clear(JvmtiBreakpoint& bp) { | |
466 if ( _bps.find(bp) == -1) { | |
467 return JVMTI_ERROR_NOT_FOUND; | |
468 } | |
469 | |
470 VM_ChangeBreakpoints clear_breakpoint(this,VM_ChangeBreakpoints::CLEAR_BREAKPOINT, &bp); | |
471 VMThread::execute(&clear_breakpoint); | |
472 return JVMTI_ERROR_NONE; | |
473 } | |
474 | |
475 void JvmtiBreakpoints::clearall_in_class_at_safepoint(klassOop klass) { | |
476 bool changed = true; | |
477 // We are going to run thru the list of bkpts | |
478 // and delete some. This deletion probably alters | |
479 // the list in some implementation defined way such | |
480 // that when we delete entry i, the next entry might | |
481 // no longer be at i+1. To be safe, each time we delete | |
482 // an entry, we'll just start again from the beginning. | |
483 // We'll stop when we make a pass thru the whole list without | |
484 // deleting anything. | |
485 while (changed) { | |
486 int len = _bps.length(); | |
487 changed = false; | |
488 for (int i = 0; i < len; i++) { | |
489 JvmtiBreakpoint& bp = _bps.at(i); | |
490 if (bp.method()->method_holder() == klass) { | |
491 bp.clear(); | |
492 _bps.remove(i); | |
493 // This changed 'i' so we have to start over. | |
494 changed = true; | |
495 break; | |
496 } | |
497 } | |
498 } | |
499 } | |
500 | |
501 void JvmtiBreakpoints::clearall() { | |
502 VM_ChangeBreakpoints clearall_breakpoint(this,VM_ChangeBreakpoints::CLEAR_ALL_BREAKPOINT); | |
503 VMThread::execute(&clearall_breakpoint); | |
504 } | |
505 | |
506 // | |
507 // class JvmtiCurrentBreakpoints | |
508 // | |
509 | |
510 JvmtiBreakpoints *JvmtiCurrentBreakpoints::_jvmti_breakpoints = NULL; | |
511 address * JvmtiCurrentBreakpoints::_breakpoint_list = NULL; | |
512 | |
513 | |
514 JvmtiBreakpoints& JvmtiCurrentBreakpoints::get_jvmti_breakpoints() { | |
515 if (_jvmti_breakpoints != NULL) return (*_jvmti_breakpoints); | |
516 _jvmti_breakpoints = new JvmtiBreakpoints(listener_fun); | |
517 assert(_jvmti_breakpoints != NULL, "_jvmti_breakpoints != NULL"); | |
518 return (*_jvmti_breakpoints); | |
519 } | |
520 | |
521 void JvmtiCurrentBreakpoints::listener_fun(void *this_obj, address *cache) { | |
522 JvmtiBreakpoints *this_jvmti = (JvmtiBreakpoints *) this_obj; | |
523 assert(this_jvmti != NULL, "this_jvmti != NULL"); | |
524 | |
525 debug_only(int n = this_jvmti->length();); | |
526 assert(cache[n] == NULL, "cache must be NULL terminated"); | |
527 | |
528 set_breakpoint_list(cache); | |
529 } | |
530 | |
531 | |
532 void JvmtiCurrentBreakpoints::oops_do(OopClosure* f) { | |
533 if (_jvmti_breakpoints != NULL) { | |
534 _jvmti_breakpoints->oops_do(f); | |
535 } | |
536 } | |
537 | |
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538 void JvmtiCurrentBreakpoints::gc_epilogue() { |
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539 if (_jvmti_breakpoints != NULL) { |
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540 _jvmti_breakpoints->gc_epilogue(); |
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541 } |
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542 } |
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543 |
0 | 544 /////////////////////////////////////////////////////////////// |
545 // | |
546 // class VM_GetOrSetLocal | |
547 // | |
548 | |
549 // Constructor for non-object getter | |
550 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type) | |
551 : _thread(thread) | |
552 , _calling_thread(NULL) | |
553 , _depth(depth) | |
554 , _index(index) | |
555 , _type(type) | |
556 , _set(false) | |
557 , _jvf(NULL) | |
558 , _result(JVMTI_ERROR_NONE) | |
559 { | |
560 } | |
561 | |
562 // Constructor for object or non-object setter | |
563 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type, jvalue value) | |
564 : _thread(thread) | |
565 , _calling_thread(NULL) | |
566 , _depth(depth) | |
567 , _index(index) | |
568 , _type(type) | |
569 , _value(value) | |
570 , _set(true) | |
571 , _jvf(NULL) | |
572 , _result(JVMTI_ERROR_NONE) | |
573 { | |
574 } | |
575 | |
576 // Constructor for object getter | |
577 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, int index) | |
578 : _thread(thread) | |
579 , _calling_thread(calling_thread) | |
580 , _depth(depth) | |
581 , _index(index) | |
582 , _type(T_OBJECT) | |
583 , _set(false) | |
584 , _jvf(NULL) | |
585 , _result(JVMTI_ERROR_NONE) | |
586 { | |
587 } | |
588 | |
589 vframe *VM_GetOrSetLocal::get_vframe() { | |
590 if (!_thread->has_last_Java_frame()) { | |
591 return NULL; | |
592 } | |
593 RegisterMap reg_map(_thread); | |
594 vframe *vf = _thread->last_java_vframe(®_map); | |
595 int d = 0; | |
596 while ((vf != NULL) && (d < _depth)) { | |
597 vf = vf->java_sender(); | |
598 d++; | |
599 } | |
600 return vf; | |
601 } | |
602 | |
603 javaVFrame *VM_GetOrSetLocal::get_java_vframe() { | |
604 vframe* vf = get_vframe(); | |
605 if (vf == NULL) { | |
606 _result = JVMTI_ERROR_NO_MORE_FRAMES; | |
607 return NULL; | |
608 } | |
609 javaVFrame *jvf = (javaVFrame*)vf; | |
610 | |
2019 | 611 if (!vf->is_java_frame()) { |
0 | 612 _result = JVMTI_ERROR_OPAQUE_FRAME; |
613 return NULL; | |
614 } | |
615 return jvf; | |
616 } | |
617 | |
618 // Check that the klass is assignable to a type with the given signature. | |
619 // Another solution could be to use the function Klass::is_subtype_of(type). | |
620 // But the type class can be forced to load/initialize eagerly in such a case. | |
621 // This may cause unexpected consequences like CFLH or class-init JVMTI events. | |
622 // It is better to avoid such a behavior. | |
623 bool VM_GetOrSetLocal::is_assignable(const char* ty_sign, Klass* klass, Thread* thread) { | |
624 assert(ty_sign != NULL, "type signature must not be NULL"); | |
625 assert(thread != NULL, "thread must not be NULL"); | |
626 assert(klass != NULL, "klass must not be NULL"); | |
627 | |
628 int len = (int) strlen(ty_sign); | |
629 if (ty_sign[0] == 'L' && ty_sign[len-1] == ';') { // Need pure class/interface name | |
630 ty_sign++; | |
631 len -= 2; | |
632 } | |
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633 TempNewSymbol ty_sym = SymbolTable::new_symbol(ty_sign, len, thread); |
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634 if (klass->name() == ty_sym) { |
0 | 635 return true; |
636 } | |
637 // Compare primary supers | |
638 int super_depth = klass->super_depth(); | |
639 int idx; | |
640 for (idx = 0; idx < super_depth; idx++) { | |
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641 if (Klass::cast(klass->primary_super_of_depth(idx))->name() == ty_sym) { |
0 | 642 return true; |
643 } | |
644 } | |
645 // Compare secondary supers | |
646 objArrayOop sec_supers = klass->secondary_supers(); | |
647 for (idx = 0; idx < sec_supers->length(); idx++) { | |
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648 if (Klass::cast((klassOop) sec_supers->obj_at(idx))->name() == ty_sym) { |
0 | 649 return true; |
650 } | |
651 } | |
652 return false; | |
653 } | |
654 | |
655 // Checks error conditions: | |
656 // JVMTI_ERROR_INVALID_SLOT | |
657 // JVMTI_ERROR_TYPE_MISMATCH | |
658 // Returns: 'true' - everything is Ok, 'false' - error code | |
659 | |
660 bool VM_GetOrSetLocal::check_slot_type(javaVFrame* jvf) { | |
661 methodOop method_oop = jvf->method(); | |
662 if (!method_oop->has_localvariable_table()) { | |
663 // Just to check index boundaries | |
664 jint extra_slot = (_type == T_LONG || _type == T_DOUBLE) ? 1 : 0; | |
665 if (_index < 0 || _index + extra_slot >= method_oop->max_locals()) { | |
666 _result = JVMTI_ERROR_INVALID_SLOT; | |
667 return false; | |
668 } | |
669 return true; | |
670 } | |
671 | |
672 jint num_entries = method_oop->localvariable_table_length(); | |
673 if (num_entries == 0) { | |
674 _result = JVMTI_ERROR_INVALID_SLOT; | |
675 return false; // There are no slots | |
676 } | |
677 int signature_idx = -1; | |
678 int vf_bci = jvf->bci(); | |
679 LocalVariableTableElement* table = method_oop->localvariable_table_start(); | |
680 for (int i = 0; i < num_entries; i++) { | |
681 int start_bci = table[i].start_bci; | |
682 int end_bci = start_bci + table[i].length; | |
683 | |
684 // Here we assume that locations of LVT entries | |
685 // with the same slot number cannot be overlapped | |
686 if (_index == (jint) table[i].slot && start_bci <= vf_bci && vf_bci <= end_bci) { | |
687 signature_idx = (int) table[i].descriptor_cp_index; | |
688 break; | |
689 } | |
690 } | |
691 if (signature_idx == -1) { | |
692 _result = JVMTI_ERROR_INVALID_SLOT; | |
693 return false; // Incorrect slot index | |
694 } | |
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695 Symbol* sign_sym = method_oop->constants()->symbol_at(signature_idx); |
0 | 696 const char* signature = (const char *) sign_sym->as_utf8(); |
697 BasicType slot_type = char2type(signature[0]); | |
698 | |
699 switch (slot_type) { | |
700 case T_BYTE: | |
701 case T_SHORT: | |
702 case T_CHAR: | |
703 case T_BOOLEAN: | |
704 slot_type = T_INT; | |
705 break; | |
706 case T_ARRAY: | |
707 slot_type = T_OBJECT; | |
708 break; | |
709 }; | |
710 if (_type != slot_type) { | |
711 _result = JVMTI_ERROR_TYPE_MISMATCH; | |
712 return false; | |
713 } | |
714 | |
715 jobject jobj = _value.l; | |
716 if (_set && slot_type == T_OBJECT && jobj != NULL) { // NULL reference is allowed | |
717 // Check that the jobject class matches the return type signature. | |
718 JavaThread* cur_thread = JavaThread::current(); | |
719 HandleMark hm(cur_thread); | |
720 | |
721 Handle obj = Handle(cur_thread, JNIHandles::resolve_external_guard(jobj)); | |
722 NULL_CHECK(obj, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
723 KlassHandle ob_kh = KlassHandle(cur_thread, obj->klass()); | |
724 NULL_CHECK(ob_kh, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
725 | |
726 if (!is_assignable(signature, Klass::cast(ob_kh()), cur_thread)) { | |
727 _result = JVMTI_ERROR_TYPE_MISMATCH; | |
728 return false; | |
729 } | |
730 } | |
731 return true; | |
732 } | |
733 | |
734 static bool can_be_deoptimized(vframe* vf) { | |
735 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized()); | |
736 } | |
737 | |
738 bool VM_GetOrSetLocal::doit_prologue() { | |
739 _jvf = get_java_vframe(); | |
740 NULL_CHECK(_jvf, false); | |
741 | |
2019 | 742 if (_jvf->method()->is_native()) { |
743 if (getting_receiver() && !_jvf->method()->is_static()) { | |
744 return true; | |
745 } else { | |
746 _result = JVMTI_ERROR_OPAQUE_FRAME; | |
747 return false; | |
748 } | |
749 } | |
750 | |
0 | 751 if (!check_slot_type(_jvf)) { |
752 return false; | |
753 } | |
754 return true; | |
755 } | |
756 | |
757 void VM_GetOrSetLocal::doit() { | |
758 if (_set) { | |
759 // Force deoptimization of frame if compiled because it's | |
760 // possible the compiler emitted some locals as constant values, | |
761 // meaning they are not mutable. | |
762 if (can_be_deoptimized(_jvf)) { | |
763 | |
764 // Schedule deoptimization so that eventually the local | |
765 // update will be written to an interpreter frame. | |
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766 Deoptimization::deoptimize_frame(_jvf->thread(), _jvf->fr().id()); |
0 | 767 |
768 // Now store a new value for the local which will be applied | |
769 // once deoptimization occurs. Note however that while this | |
770 // write is deferred until deoptimization actually happens | |
771 // can vframe created after this point will have its locals | |
772 // reflecting this update so as far as anyone can see the | |
773 // write has already taken place. | |
774 | |
775 // If we are updating an oop then get the oop from the handle | |
776 // since the handle will be long gone by the time the deopt | |
777 // happens. The oop stored in the deferred local will be | |
778 // gc'd on its own. | |
779 if (_type == T_OBJECT) { | |
780 _value.l = (jobject) (JNIHandles::resolve_external_guard(_value.l)); | |
781 } | |
782 // Re-read the vframe so we can see that it is deoptimized | |
783 // [ Only need because of assert in update_local() ] | |
784 _jvf = get_java_vframe(); | |
785 ((compiledVFrame*)_jvf)->update_local(_type, _index, _value); | |
786 return; | |
787 } | |
788 StackValueCollection *locals = _jvf->locals(); | |
789 HandleMark hm; | |
790 | |
791 switch (_type) { | |
2019 | 792 case T_INT: locals->set_int_at (_index, _value.i); break; |
793 case T_LONG: locals->set_long_at (_index, _value.j); break; | |
794 case T_FLOAT: locals->set_float_at (_index, _value.f); break; | |
795 case T_DOUBLE: locals->set_double_at(_index, _value.d); break; | |
796 case T_OBJECT: { | |
797 Handle ob_h(JNIHandles::resolve_external_guard(_value.l)); | |
798 locals->set_obj_at (_index, ob_h); | |
799 break; | |
800 } | |
801 default: ShouldNotReachHere(); | |
0 | 802 } |
803 _jvf->set_locals(locals); | |
804 } else { | |
2019 | 805 if (_jvf->method()->is_native() && _jvf->is_compiled_frame()) { |
806 assert(getting_receiver(), "Can only get here when getting receiver"); | |
807 oop receiver = _jvf->fr().get_native_receiver(); | |
808 _value.l = JNIHandles::make_local(_calling_thread, receiver); | |
809 } else { | |
810 StackValueCollection *locals = _jvf->locals(); | |
0 | 811 |
2019 | 812 if (locals->at(_index)->type() == T_CONFLICT) { |
813 memset(&_value, 0, sizeof(_value)); | |
814 _value.l = NULL; | |
815 return; | |
816 } | |
0 | 817 |
2019 | 818 switch (_type) { |
819 case T_INT: _value.i = locals->int_at (_index); break; | |
820 case T_LONG: _value.j = locals->long_at (_index); break; | |
821 case T_FLOAT: _value.f = locals->float_at (_index); break; | |
822 case T_DOUBLE: _value.d = locals->double_at(_index); break; | |
823 case T_OBJECT: { | |
824 // Wrap the oop to be returned in a local JNI handle since | |
825 // oops_do() no longer applies after doit() is finished. | |
826 oop obj = locals->obj_at(_index)(); | |
827 _value.l = JNIHandles::make_local(_calling_thread, obj); | |
828 break; | |
829 } | |
830 default: ShouldNotReachHere(); | |
831 } | |
0 | 832 } |
833 } | |
834 } | |
835 | |
836 | |
837 bool VM_GetOrSetLocal::allow_nested_vm_operations() const { | |
838 return true; // May need to deoptimize | |
839 } | |
840 | |
841 | |
2019 | 842 VM_GetReceiver::VM_GetReceiver( |
843 JavaThread* thread, JavaThread* caller_thread, jint depth) | |
844 : VM_GetOrSetLocal(thread, caller_thread, depth, 0) {} | |
845 | |
0 | 846 ///////////////////////////////////////////////////////////////////////////////////////// |
847 | |
848 // | |
849 // class JvmtiSuspendControl - see comments in jvmtiImpl.hpp | |
850 // | |
851 | |
852 bool JvmtiSuspendControl::suspend(JavaThread *java_thread) { | |
853 // external suspend should have caught suspending a thread twice | |
854 | |
855 // Immediate suspension required for JPDA back-end so JVMTI agent threads do | |
856 // not deadlock due to later suspension on transitions while holding | |
857 // raw monitors. Passing true causes the immediate suspension. | |
858 // java_suspend() will catch threads in the process of exiting | |
859 // and will ignore them. | |
860 java_thread->java_suspend(); | |
861 | |
862 // It would be nice to have the following assertion in all the time, | |
863 // but it is possible for a racing resume request to have resumed | |
864 // this thread right after we suspended it. Temporarily enable this | |
865 // assertion if you are chasing a different kind of bug. | |
866 // | |
867 // assert(java_lang_Thread::thread(java_thread->threadObj()) == NULL || | |
868 // java_thread->is_being_ext_suspended(), "thread is not suspended"); | |
869 | |
870 if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) { | |
871 // check again because we can get delayed in java_suspend(): | |
872 // the thread is in process of exiting. | |
873 return false; | |
874 } | |
875 | |
876 return true; | |
877 } | |
878 | |
879 bool JvmtiSuspendControl::resume(JavaThread *java_thread) { | |
880 // external suspend should have caught resuming a thread twice | |
881 assert(java_thread->is_being_ext_suspended(), "thread should be suspended"); | |
882 | |
883 // resume thread | |
884 { | |
885 // must always grab Threads_lock, see JVM_SuspendThread | |
886 MutexLocker ml(Threads_lock); | |
887 java_thread->java_resume(); | |
888 } | |
889 | |
890 return true; | |
891 } | |
892 | |
893 | |
894 void JvmtiSuspendControl::print() { | |
895 #ifndef PRODUCT | |
896 MutexLocker mu(Threads_lock); | |
897 ResourceMark rm; | |
898 | |
899 tty->print("Suspended Threads: ["); | |
900 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
901 #if JVMTI_TRACE | |
902 const char *name = JvmtiTrace::safe_get_thread_name(thread); | |
903 #else | |
904 const char *name = ""; | |
905 #endif /*JVMTI_TRACE */ | |
906 tty->print("%s(%c ", name, thread->is_being_ext_suspended() ? 'S' : '_'); | |
907 if (!thread->has_last_Java_frame()) { | |
908 tty->print("no stack"); | |
909 } | |
910 tty->print(") "); | |
911 } | |
912 tty->print_cr("]"); | |
913 #endif | |
914 } | |
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915 |
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916 #ifndef KERNEL |
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917 |
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918 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_load_event( |
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919 nmethod* nm) { |
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920 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_LOAD); |
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921 event._event_data.compiled_method_load = nm; |
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922 // Keep the nmethod alive until the ServiceThread can process |
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923 // this deferred event. |
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924 nmethodLocker::lock_nmethod(nm); |
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925 return event; |
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926 } |
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927 |
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928 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_unload_event( |
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929 nmethod* nm, jmethodID id, const void* code) { |
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930 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_UNLOAD); |
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931 event._event_data.compiled_method_unload.nm = nm; |
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932 event._event_data.compiled_method_unload.method_id = id; |
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933 event._event_data.compiled_method_unload.code_begin = code; |
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934 // Keep the nmethod alive until the ServiceThread can process |
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935 // this deferred event. This will keep the memory for the |
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936 // generated code from being reused too early. We pass |
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937 // zombie_ok == true here so that our nmethod that was just |
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938 // made into a zombie can be locked. |
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939 nmethodLocker::lock_nmethod(nm, true /* zombie_ok */); |
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940 return event; |
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941 } |
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942 JvmtiDeferredEvent JvmtiDeferredEvent::dynamic_code_generated_event( |
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943 const char* name, const void* code_begin, const void* code_end) { |
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944 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_DYNAMIC_CODE_GENERATED); |
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945 event._event_data.dynamic_code_generated.name = name; |
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946 event._event_data.dynamic_code_generated.code_begin = code_begin; |
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947 event._event_data.dynamic_code_generated.code_end = code_end; |
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948 return event; |
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949 } |
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950 |
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951 void JvmtiDeferredEvent::post() { |
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952 assert(ServiceThread::is_service_thread(Thread::current()), |
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953 "Service thread must post enqueued events"); |
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954 switch(_type) { |
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955 case TYPE_COMPILED_METHOD_LOAD: { |
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956 nmethod* nm = _event_data.compiled_method_load; |
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957 JvmtiExport::post_compiled_method_load(nm); |
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958 // done with the deferred event so unlock the nmethod |
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959 nmethodLocker::unlock_nmethod(nm); |
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960 break; |
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961 } |
2342
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962 case TYPE_COMPILED_METHOD_UNLOAD: { |
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963 nmethod* nm = _event_data.compiled_method_unload.nm; |
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964 JvmtiExport::post_compiled_method_unload( |
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965 _event_data.compiled_method_unload.method_id, |
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966 _event_data.compiled_method_unload.code_begin); |
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967 // done with the deferred event so unlock the nmethod |
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968 nmethodLocker::unlock_nmethod(nm); |
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969 break; |
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970 } |
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971 case TYPE_DYNAMIC_CODE_GENERATED: |
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972 JvmtiExport::post_dynamic_code_generated_internal( |
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973 _event_data.dynamic_code_generated.name, |
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974 _event_data.dynamic_code_generated.code_begin, |
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975 _event_data.dynamic_code_generated.code_end); |
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976 break; |
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977 default: |
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978 ShouldNotReachHere(); |
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979 } |
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980 } |
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981 |
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982 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_tail = NULL; |
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983 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_head = NULL; |
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984 |
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985 volatile JvmtiDeferredEventQueue::QueueNode* |
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986 JvmtiDeferredEventQueue::_pending_list = NULL; |
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987 |
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988 bool JvmtiDeferredEventQueue::has_events() { |
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989 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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990 return _queue_head != NULL || _pending_list != NULL; |
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991 } |
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992 |
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993 void JvmtiDeferredEventQueue::enqueue(const JvmtiDeferredEvent& event) { |
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994 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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995 |
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996 process_pending_events(); |
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997 |
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998 // Events get added to the end of the queue (and are pulled off the front). |
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999 QueueNode* node = new QueueNode(event); |
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1000 if (_queue_tail == NULL) { |
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1001 _queue_tail = _queue_head = node; |
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1002 } else { |
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1003 assert(_queue_tail->next() == NULL, "Must be the last element in the list"); |
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1004 _queue_tail->set_next(node); |
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1005 _queue_tail = node; |
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1006 } |
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1007 |
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1008 Service_lock->notify_all(); |
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1009 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1010 "Inconsistent queue markers"); |
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1011 } |
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1012 |
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1013 JvmtiDeferredEvent JvmtiDeferredEventQueue::dequeue() { |
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1014 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1015 |
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1016 process_pending_events(); |
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1017 |
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1018 assert(_queue_head != NULL, "Nothing to dequeue"); |
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1019 |
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1020 if (_queue_head == NULL) { |
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1021 // Just in case this happens in product; it shouldn't but let's not crash |
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1022 return JvmtiDeferredEvent(); |
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1023 } |
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1024 |
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1025 QueueNode* node = _queue_head; |
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1026 _queue_head = _queue_head->next(); |
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1027 if (_queue_head == NULL) { |
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1028 _queue_tail = NULL; |
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1029 } |
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1030 |
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1031 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1032 "Inconsistent queue markers"); |
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1033 |
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1034 JvmtiDeferredEvent event = node->event(); |
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1035 delete node; |
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1036 return event; |
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1037 } |
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1038 |
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1039 void JvmtiDeferredEventQueue::add_pending_event( |
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1040 const JvmtiDeferredEvent& event) { |
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1041 |
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1042 QueueNode* node = new QueueNode(event); |
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1043 |
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1044 bool success = false; |
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1045 QueueNode* prev_value = (QueueNode*)_pending_list; |
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1046 do { |
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1047 node->set_next(prev_value); |
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1048 prev_value = (QueueNode*)Atomic::cmpxchg_ptr( |
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1049 (void*)node, (volatile void*)&_pending_list, (void*)node->next()); |
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1050 } while (prev_value != node->next()); |
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1051 } |
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1052 |
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1053 // This method transfers any events that were added by someone NOT holding |
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1054 // the lock into the mainline queue. |
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1055 void JvmtiDeferredEventQueue::process_pending_events() { |
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1056 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1057 |
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1058 if (_pending_list != NULL) { |
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1059 QueueNode* head = |
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1060 (QueueNode*)Atomic::xchg_ptr(NULL, (volatile void*)&_pending_list); |
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1061 |
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1062 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1063 "Inconsistent queue markers"); |
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1064 |
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1065 if (head != NULL) { |
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1066 // Since we've treated the pending list as a stack (with newer |
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1067 // events at the beginning), we need to join the bottom of the stack |
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1068 // with the 'tail' of the queue in order to get the events in the |
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1069 // right order. We do this by reversing the pending list and appending |
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1070 // it to the queue. |
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1071 |
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1072 QueueNode* new_tail = head; |
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1073 QueueNode* new_head = NULL; |
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1074 |
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1075 // This reverses the list |
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1076 QueueNode* prev = new_tail; |
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1077 QueueNode* node = new_tail->next(); |
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1078 new_tail->set_next(NULL); |
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1079 while (node != NULL) { |
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1080 QueueNode* next = node->next(); |
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1081 node->set_next(prev); |
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1082 prev = node; |
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1083 node = next; |
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1084 } |
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1085 new_head = prev; |
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1086 |
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1087 // Now append the new list to the queue |
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1088 if (_queue_tail != NULL) { |
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1089 _queue_tail->set_next(new_head); |
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1090 } else { // _queue_head == NULL |
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1091 _queue_head = new_head; |
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1092 } |
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1093 _queue_tail = new_tail; |
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1094 } |
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1095 } |
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1096 } |
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1097 |
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1098 #endif // ndef KERNEL |