Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiImpl.cpp @ 6985:80e866b1d053
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author | coleenp |
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date | Fri, 16 Nov 2012 09:19:12 -0500 |
parents | 070d523b96a7 |
children | 2cb439954abf f34d701e952e |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2012, 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/os.hpp" |
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42 #include "runtime/serviceThread.hpp" |
1972 | 43 #include "runtime/signature.hpp" |
44 #include "runtime/vframe.hpp" | |
45 #include "runtime/vframe_hp.hpp" | |
46 #include "runtime/vm_operations.hpp" | |
47 #include "utilities/exceptions.hpp" | |
48 #ifdef TARGET_OS_FAMILY_linux | |
49 # include "thread_linux.inline.hpp" | |
50 #endif | |
51 #ifdef TARGET_OS_FAMILY_solaris | |
52 # include "thread_solaris.inline.hpp" | |
53 #endif | |
54 #ifdef TARGET_OS_FAMILY_windows | |
55 # include "thread_windows.inline.hpp" | |
56 #endif | |
3960 | 57 #ifdef TARGET_OS_FAMILY_bsd |
58 # include "thread_bsd.inline.hpp" | |
59 #endif | |
0 | 60 |
61 // | |
62 // class JvmtiAgentThread | |
63 // | |
64 // JavaThread used to wrap a thread started by an agent | |
65 // using the JVMTI method RunAgentThread. | |
66 // | |
67 | |
68 JvmtiAgentThread::JvmtiAgentThread(JvmtiEnv* env, jvmtiStartFunction start_fn, const void *start_arg) | |
69 : JavaThread(start_function_wrapper) { | |
70 _env = env; | |
71 _start_fn = start_fn; | |
72 _start_arg = start_arg; | |
73 } | |
74 | |
75 void | |
76 JvmtiAgentThread::start_function_wrapper(JavaThread *thread, TRAPS) { | |
77 // It is expected that any Agent threads will be created as | |
78 // Java Threads. If this is the case, notification of the creation | |
79 // of the thread is given in JavaThread::thread_main(). | |
80 assert(thread->is_Java_thread(), "debugger thread should be a Java Thread"); | |
81 assert(thread == JavaThread::current(), "sanity check"); | |
82 | |
83 JvmtiAgentThread *dthread = (JvmtiAgentThread *)thread; | |
84 dthread->call_start_function(); | |
85 } | |
86 | |
87 void | |
88 JvmtiAgentThread::call_start_function() { | |
89 ThreadToNativeFromVM transition(this); | |
90 _start_fn(_env->jvmti_external(), jni_environment(), (void*)_start_arg); | |
91 } | |
92 | |
93 | |
94 // | |
95 // class GrowableCache - private methods | |
96 // | |
97 | |
98 void GrowableCache::recache() { | |
99 int len = _elements->length(); | |
100 | |
6197 | 101 FREE_C_HEAP_ARRAY(address, _cache, mtInternal); |
102 _cache = NEW_C_HEAP_ARRAY(address,len+1, mtInternal); | |
0 | 103 |
104 for (int i=0; i<len; i++) { | |
105 _cache[i] = _elements->at(i)->getCacheValue(); | |
106 // | |
107 // The cache entry has gone bad. Without a valid frame pointer | |
108 // value, the entry is useless so we simply delete it in product | |
109 // mode. The call to remove() will rebuild the cache again | |
110 // without the bad entry. | |
111 // | |
112 if (_cache[i] == NULL) { | |
113 assert(false, "cannot recache NULL elements"); | |
114 remove(i); | |
115 return; | |
116 } | |
117 } | |
118 _cache[len] = NULL; | |
119 | |
120 _listener_fun(_this_obj,_cache); | |
121 } | |
122 | |
123 bool GrowableCache::equals(void* v, GrowableElement *e2) { | |
124 GrowableElement *e1 = (GrowableElement *) v; | |
125 assert(e1 != NULL, "e1 != NULL"); | |
126 assert(e2 != NULL, "e2 != NULL"); | |
127 | |
128 return e1->equals(e2); | |
129 } | |
130 | |
131 // | |
132 // class GrowableCache - public methods | |
133 // | |
134 | |
135 GrowableCache::GrowableCache() { | |
136 _this_obj = NULL; | |
137 _listener_fun = NULL; | |
138 _elements = NULL; | |
139 _cache = NULL; | |
140 } | |
141 | |
142 GrowableCache::~GrowableCache() { | |
143 clear(); | |
144 delete _elements; | |
6197 | 145 FREE_C_HEAP_ARRAY(address, _cache, mtInternal); |
0 | 146 } |
147 | |
148 void GrowableCache::initialize(void *this_obj, void listener_fun(void *, address*) ) { | |
149 _this_obj = this_obj; | |
150 _listener_fun = listener_fun; | |
6197 | 151 _elements = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<GrowableElement*>(5,true); |
0 | 152 recache(); |
153 } | |
154 | |
155 // number of elements in the collection | |
156 int GrowableCache::length() { | |
157 return _elements->length(); | |
158 } | |
159 | |
160 // get the value of the index element in the collection | |
161 GrowableElement* GrowableCache::at(int index) { | |
162 GrowableElement *e = (GrowableElement *) _elements->at(index); | |
163 assert(e != NULL, "e != NULL"); | |
164 return e; | |
165 } | |
166 | |
167 int GrowableCache::find(GrowableElement* e) { | |
168 return _elements->find(e, GrowableCache::equals); | |
169 } | |
170 | |
171 // append a copy of the element to the end of the collection | |
172 void GrowableCache::append(GrowableElement* e) { | |
173 GrowableElement *new_e = e->clone(); | |
174 _elements->append(new_e); | |
175 recache(); | |
176 } | |
177 | |
178 // insert a copy of the element using lessthan() | |
179 void GrowableCache::insert(GrowableElement* e) { | |
180 GrowableElement *new_e = e->clone(); | |
181 _elements->append(new_e); | |
182 | |
183 int n = length()-2; | |
184 for (int i=n; i>=0; i--) { | |
185 GrowableElement *e1 = _elements->at(i); | |
186 GrowableElement *e2 = _elements->at(i+1); | |
187 if (e2->lessThan(e1)) { | |
188 _elements->at_put(i+1, e1); | |
189 _elements->at_put(i, e2); | |
190 } | |
191 } | |
192 | |
193 recache(); | |
194 } | |
195 | |
196 // remove the element at index | |
197 void GrowableCache::remove (int index) { | |
198 GrowableElement *e = _elements->at(index); | |
199 assert(e != NULL, "e != NULL"); | |
200 _elements->remove(e); | |
201 delete e; | |
202 recache(); | |
203 } | |
204 | |
205 // clear out all elements, release all heap space and | |
206 // let our listener know that things have changed. | |
207 void GrowableCache::clear() { | |
208 int len = _elements->length(); | |
209 for (int i=0; i<len; i++) { | |
210 delete _elements->at(i); | |
211 } | |
212 _elements->clear(); | |
213 recache(); | |
214 } | |
215 | |
216 void GrowableCache::oops_do(OopClosure* f) { | |
217 int len = _elements->length(); | |
218 for (int i=0; i<len; i++) { | |
219 GrowableElement *e = _elements->at(i); | |
220 e->oops_do(f); | |
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221 } |
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222 } |
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223 |
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224 void GrowableCache::gc_epilogue() { |
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225 int len = _elements->length(); |
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226 for (int i=0; i<len; i++) { |
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227 _cache[i] = _elements->at(i)->getCacheValue(); |
0 | 228 } |
229 } | |
230 | |
231 // | |
232 // class JvmtiBreakpoint | |
233 // | |
234 | |
235 JvmtiBreakpoint::JvmtiBreakpoint() { | |
236 _method = NULL; | |
237 _bci = 0; | |
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238 _class_loader = NULL; |
0 | 239 #ifdef CHECK_UNHANDLED_OOPS |
240 // This one is always allocated with new, but check it just in case. | |
241 Thread *thread = Thread::current(); | |
242 if (thread->is_in_stack((address)&_method)) { | |
243 thread->allow_unhandled_oop((oop*)&_method); | |
244 } | |
245 #endif // CHECK_UNHANDLED_OOPS | |
246 } | |
247 | |
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248 JvmtiBreakpoint::JvmtiBreakpoint(Method* m_method, jlocation location) { |
0 | 249 _method = m_method; |
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250 _class_loader = _method->method_holder()->class_loader_data()->class_loader(); |
0 | 251 assert(_method != NULL, "_method != NULL"); |
252 _bci = (int) location; | |
253 assert(_bci >= 0, "_bci >= 0"); | |
254 } | |
255 | |
256 void JvmtiBreakpoint::copy(JvmtiBreakpoint& bp) { | |
257 _method = bp._method; | |
258 _bci = bp._bci; | |
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259 _class_loader = bp._class_loader; |
0 | 260 } |
261 | |
262 bool JvmtiBreakpoint::lessThan(JvmtiBreakpoint& bp) { | |
263 Unimplemented(); | |
264 return false; | |
265 } | |
266 | |
267 bool JvmtiBreakpoint::equals(JvmtiBreakpoint& bp) { | |
268 return _method == bp._method | |
269 && _bci == bp._bci; | |
270 } | |
271 | |
272 bool JvmtiBreakpoint::is_valid() { | |
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273 // class loader can be NULL |
0 | 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) { | |
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283 ((Method*)_method->*meth_act)(_bci); |
0 | 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 | |
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301 PreviousVersionWalker pvw((InstanceKlass *)ikh()); |
0 | 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); | |
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323 // obsolete methods that are running are not deleted from |
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324 // previous version array, but they are skipped here. |
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325 if (!method->is_obsolete() && |
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326 method->name() == m_name && |
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327 method->signature() == m_signature) { |
0 | 328 RC_TRACE(0x00000800, ("%sing breakpoint in %s(%s)", |
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329 meth_act == &Method::set_breakpoint ? "sett" : "clear", |
0 | 330 method->name()->as_C_string(), |
331 method->signature()->as_C_string())); | |
332 | |
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333 ((Method*)method()->*meth_act)(_bci); |
0 | 334 break; |
335 } | |
336 } | |
337 } | |
338 } // pvw is cleaned up | |
339 } // rm is cleaned up | |
340 } | |
341 | |
342 void JvmtiBreakpoint::set() { | |
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343 each_method_version_do(&Method::set_breakpoint); |
0 | 344 } |
345 | |
346 void JvmtiBreakpoint::clear() { | |
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347 each_method_version_do(&Method::clear_breakpoint); |
0 | 348 } |
349 | |
350 void JvmtiBreakpoint::print() { | |
351 #ifndef PRODUCT | |
352 const char *class_name = (_method == NULL) ? "NULL" : _method->klass_name()->as_C_string(); | |
353 const char *method_name = (_method == NULL) ? "NULL" : _method->name()->as_C_string(); | |
354 | |
355 tty->print("Breakpoint(%s,%s,%d,%p)",class_name, method_name, _bci, getBcp()); | |
356 #endif | |
357 } | |
358 | |
359 | |
360 // | |
361 // class VM_ChangeBreakpoints | |
362 // | |
363 // Modify the Breakpoints data structure at a safepoint | |
364 // | |
365 | |
366 void VM_ChangeBreakpoints::doit() { | |
367 switch (_operation) { | |
368 case SET_BREAKPOINT: | |
369 _breakpoints->set_at_safepoint(*_bp); | |
370 break; | |
371 case CLEAR_BREAKPOINT: | |
372 _breakpoints->clear_at_safepoint(*_bp); | |
373 break; | |
374 case CLEAR_ALL_BREAKPOINT: | |
375 _breakpoints->clearall_at_safepoint(); | |
376 break; | |
377 default: | |
378 assert(false, "Unknown operation"); | |
379 } | |
380 } | |
381 | |
382 void VM_ChangeBreakpoints::oops_do(OopClosure* f) { | |
383 // This operation keeps breakpoints alive | |
384 if (_breakpoints != NULL) { | |
385 _breakpoints->oops_do(f); | |
386 } | |
387 if (_bp != NULL) { | |
388 _bp->oops_do(f); | |
389 } | |
390 } | |
391 | |
392 // | |
393 // class JvmtiBreakpoints | |
394 // | |
395 // a JVMTI internal collection of JvmtiBreakpoint | |
396 // | |
397 | |
398 JvmtiBreakpoints::JvmtiBreakpoints(void listener_fun(void *,address *)) { | |
399 _bps.initialize(this,listener_fun); | |
400 } | |
401 | |
402 JvmtiBreakpoints:: ~JvmtiBreakpoints() {} | |
403 | |
404 void JvmtiBreakpoints::oops_do(OopClosure* f) { | |
405 _bps.oops_do(f); | |
406 } | |
407 | |
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408 void JvmtiBreakpoints::gc_epilogue() { |
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409 _bps.gc_epilogue(); |
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410 } |
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411 |
0 | 412 void JvmtiBreakpoints::print() { |
413 #ifndef PRODUCT | |
414 ResourceMark rm; | |
415 | |
416 int n = _bps.length(); | |
417 for (int i=0; i<n; i++) { | |
418 JvmtiBreakpoint& bp = _bps.at(i); | |
419 tty->print("%d: ", i); | |
420 bp.print(); | |
421 tty->print_cr(""); | |
422 } | |
423 #endif | |
424 } | |
425 | |
426 | |
427 void JvmtiBreakpoints::set_at_safepoint(JvmtiBreakpoint& bp) { | |
428 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
429 | |
430 int i = _bps.find(bp); | |
431 if (i == -1) { | |
432 _bps.append(bp); | |
433 bp.set(); | |
434 } | |
435 } | |
436 | |
437 void JvmtiBreakpoints::clear_at_safepoint(JvmtiBreakpoint& bp) { | |
438 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
439 | |
440 int i = _bps.find(bp); | |
441 if (i != -1) { | |
442 _bps.remove(i); | |
443 bp.clear(); | |
444 } | |
445 } | |
446 | |
447 void JvmtiBreakpoints::clearall_at_safepoint() { | |
448 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
449 | |
450 int len = _bps.length(); | |
451 for (int i=0; i<len; i++) { | |
452 _bps.at(i).clear(); | |
453 } | |
454 _bps.clear(); | |
455 } | |
456 | |
457 int JvmtiBreakpoints::length() { return _bps.length(); } | |
458 | |
459 int JvmtiBreakpoints::set(JvmtiBreakpoint& bp) { | |
460 if ( _bps.find(bp) != -1) { | |
461 return JVMTI_ERROR_DUPLICATE; | |
462 } | |
463 VM_ChangeBreakpoints set_breakpoint(this,VM_ChangeBreakpoints::SET_BREAKPOINT, &bp); | |
464 VMThread::execute(&set_breakpoint); | |
465 return JVMTI_ERROR_NONE; | |
466 } | |
467 | |
468 int JvmtiBreakpoints::clear(JvmtiBreakpoint& bp) { | |
469 if ( _bps.find(bp) == -1) { | |
470 return JVMTI_ERROR_NOT_FOUND; | |
471 } | |
472 | |
473 VM_ChangeBreakpoints clear_breakpoint(this,VM_ChangeBreakpoints::CLEAR_BREAKPOINT, &bp); | |
474 VMThread::execute(&clear_breakpoint); | |
475 return JVMTI_ERROR_NONE; | |
476 } | |
477 | |
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478 void JvmtiBreakpoints::clearall_in_class_at_safepoint(Klass* klass) { |
0 | 479 bool changed = true; |
480 // We are going to run thru the list of bkpts | |
481 // and delete some. This deletion probably alters | |
482 // the list in some implementation defined way such | |
483 // that when we delete entry i, the next entry might | |
484 // no longer be at i+1. To be safe, each time we delete | |
485 // an entry, we'll just start again from the beginning. | |
486 // We'll stop when we make a pass thru the whole list without | |
487 // deleting anything. | |
488 while (changed) { | |
489 int len = _bps.length(); | |
490 changed = false; | |
491 for (int i = 0; i < len; i++) { | |
492 JvmtiBreakpoint& bp = _bps.at(i); | |
493 if (bp.method()->method_holder() == klass) { | |
494 bp.clear(); | |
495 _bps.remove(i); | |
496 // This changed 'i' so we have to start over. | |
497 changed = true; | |
498 break; | |
499 } | |
500 } | |
501 } | |
502 } | |
503 | |
504 void JvmtiBreakpoints::clearall() { | |
505 VM_ChangeBreakpoints clearall_breakpoint(this,VM_ChangeBreakpoints::CLEAR_ALL_BREAKPOINT); | |
506 VMThread::execute(&clearall_breakpoint); | |
507 } | |
508 | |
509 // | |
510 // class JvmtiCurrentBreakpoints | |
511 // | |
512 | |
513 JvmtiBreakpoints *JvmtiCurrentBreakpoints::_jvmti_breakpoints = NULL; | |
514 address * JvmtiCurrentBreakpoints::_breakpoint_list = NULL; | |
515 | |
516 | |
517 JvmtiBreakpoints& JvmtiCurrentBreakpoints::get_jvmti_breakpoints() { | |
518 if (_jvmti_breakpoints != NULL) return (*_jvmti_breakpoints); | |
519 _jvmti_breakpoints = new JvmtiBreakpoints(listener_fun); | |
520 assert(_jvmti_breakpoints != NULL, "_jvmti_breakpoints != NULL"); | |
521 return (*_jvmti_breakpoints); | |
522 } | |
523 | |
524 void JvmtiCurrentBreakpoints::listener_fun(void *this_obj, address *cache) { | |
525 JvmtiBreakpoints *this_jvmti = (JvmtiBreakpoints *) this_obj; | |
526 assert(this_jvmti != NULL, "this_jvmti != NULL"); | |
527 | |
528 debug_only(int n = this_jvmti->length();); | |
529 assert(cache[n] == NULL, "cache must be NULL terminated"); | |
530 | |
531 set_breakpoint_list(cache); | |
532 } | |
533 | |
534 | |
535 void JvmtiCurrentBreakpoints::oops_do(OopClosure* f) { | |
536 if (_jvmti_breakpoints != NULL) { | |
537 _jvmti_breakpoints->oops_do(f); | |
538 } | |
539 } | |
540 | |
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541 void JvmtiCurrentBreakpoints::gc_epilogue() { |
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542 if (_jvmti_breakpoints != NULL) { |
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543 _jvmti_breakpoints->gc_epilogue(); |
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544 } |
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545 } |
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546 |
0 | 547 /////////////////////////////////////////////////////////////// |
548 // | |
549 // class VM_GetOrSetLocal | |
550 // | |
551 | |
552 // Constructor for non-object getter | |
553 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type) | |
554 : _thread(thread) | |
555 , _calling_thread(NULL) | |
556 , _depth(depth) | |
557 , _index(index) | |
558 , _type(type) | |
559 , _set(false) | |
560 , _jvf(NULL) | |
561 , _result(JVMTI_ERROR_NONE) | |
562 { | |
563 } | |
564 | |
565 // Constructor for object or non-object setter | |
566 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type, jvalue value) | |
567 : _thread(thread) | |
568 , _calling_thread(NULL) | |
569 , _depth(depth) | |
570 , _index(index) | |
571 , _type(type) | |
572 , _value(value) | |
573 , _set(true) | |
574 , _jvf(NULL) | |
575 , _result(JVMTI_ERROR_NONE) | |
576 { | |
577 } | |
578 | |
579 // Constructor for object getter | |
580 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, int index) | |
581 : _thread(thread) | |
582 , _calling_thread(calling_thread) | |
583 , _depth(depth) | |
584 , _index(index) | |
585 , _type(T_OBJECT) | |
586 , _set(false) | |
587 , _jvf(NULL) | |
588 , _result(JVMTI_ERROR_NONE) | |
589 { | |
590 } | |
591 | |
592 vframe *VM_GetOrSetLocal::get_vframe() { | |
593 if (!_thread->has_last_Java_frame()) { | |
594 return NULL; | |
595 } | |
596 RegisterMap reg_map(_thread); | |
597 vframe *vf = _thread->last_java_vframe(®_map); | |
598 int d = 0; | |
599 while ((vf != NULL) && (d < _depth)) { | |
600 vf = vf->java_sender(); | |
601 d++; | |
602 } | |
603 return vf; | |
604 } | |
605 | |
606 javaVFrame *VM_GetOrSetLocal::get_java_vframe() { | |
607 vframe* vf = get_vframe(); | |
608 if (vf == NULL) { | |
609 _result = JVMTI_ERROR_NO_MORE_FRAMES; | |
610 return NULL; | |
611 } | |
612 javaVFrame *jvf = (javaVFrame*)vf; | |
613 | |
2019 | 614 if (!vf->is_java_frame()) { |
0 | 615 _result = JVMTI_ERROR_OPAQUE_FRAME; |
616 return NULL; | |
617 } | |
618 return jvf; | |
619 } | |
620 | |
621 // Check that the klass is assignable to a type with the given signature. | |
622 // Another solution could be to use the function Klass::is_subtype_of(type). | |
623 // But the type class can be forced to load/initialize eagerly in such a case. | |
624 // This may cause unexpected consequences like CFLH or class-init JVMTI events. | |
625 // It is better to avoid such a behavior. | |
626 bool VM_GetOrSetLocal::is_assignable(const char* ty_sign, Klass* klass, Thread* thread) { | |
627 assert(ty_sign != NULL, "type signature must not be NULL"); | |
628 assert(thread != NULL, "thread must not be NULL"); | |
629 assert(klass != NULL, "klass must not be NULL"); | |
630 | |
631 int len = (int) strlen(ty_sign); | |
632 if (ty_sign[0] == 'L' && ty_sign[len-1] == ';') { // Need pure class/interface name | |
633 ty_sign++; | |
634 len -= 2; | |
635 } | |
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636 TempNewSymbol ty_sym = SymbolTable::new_symbol(ty_sign, len, thread); |
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637 if (klass->name() == ty_sym) { |
0 | 638 return true; |
639 } | |
640 // Compare primary supers | |
641 int super_depth = klass->super_depth(); | |
642 int idx; | |
643 for (idx = 0; idx < super_depth; idx++) { | |
6983 | 644 if (klass->primary_super_of_depth(idx)->name() == ty_sym) { |
0 | 645 return true; |
646 } | |
647 } | |
648 // Compare secondary supers | |
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649 Array<Klass*>* sec_supers = klass->secondary_supers(); |
0 | 650 for (idx = 0; idx < sec_supers->length(); idx++) { |
6983 | 651 if (((Klass*) sec_supers->at(idx))->name() == ty_sym) { |
0 | 652 return true; |
653 } | |
654 } | |
655 return false; | |
656 } | |
657 | |
658 // Checks error conditions: | |
659 // JVMTI_ERROR_INVALID_SLOT | |
660 // JVMTI_ERROR_TYPE_MISMATCH | |
661 // Returns: 'true' - everything is Ok, 'false' - error code | |
662 | |
663 bool VM_GetOrSetLocal::check_slot_type(javaVFrame* jvf) { | |
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664 Method* method_oop = jvf->method(); |
0 | 665 if (!method_oop->has_localvariable_table()) { |
666 // Just to check index boundaries | |
667 jint extra_slot = (_type == T_LONG || _type == T_DOUBLE) ? 1 : 0; | |
668 if (_index < 0 || _index + extra_slot >= method_oop->max_locals()) { | |
669 _result = JVMTI_ERROR_INVALID_SLOT; | |
670 return false; | |
671 } | |
672 return true; | |
673 } | |
674 | |
675 jint num_entries = method_oop->localvariable_table_length(); | |
676 if (num_entries == 0) { | |
677 _result = JVMTI_ERROR_INVALID_SLOT; | |
678 return false; // There are no slots | |
679 } | |
680 int signature_idx = -1; | |
681 int vf_bci = jvf->bci(); | |
682 LocalVariableTableElement* table = method_oop->localvariable_table_start(); | |
683 for (int i = 0; i < num_entries; i++) { | |
684 int start_bci = table[i].start_bci; | |
685 int end_bci = start_bci + table[i].length; | |
686 | |
687 // Here we assume that locations of LVT entries | |
688 // with the same slot number cannot be overlapped | |
689 if (_index == (jint) table[i].slot && start_bci <= vf_bci && vf_bci <= end_bci) { | |
690 signature_idx = (int) table[i].descriptor_cp_index; | |
691 break; | |
692 } | |
693 } | |
694 if (signature_idx == -1) { | |
695 _result = JVMTI_ERROR_INVALID_SLOT; | |
696 return false; // Incorrect slot index | |
697 } | |
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698 Symbol* sign_sym = method_oop->constants()->symbol_at(signature_idx); |
0 | 699 const char* signature = (const char *) sign_sym->as_utf8(); |
700 BasicType slot_type = char2type(signature[0]); | |
701 | |
702 switch (slot_type) { | |
703 case T_BYTE: | |
704 case T_SHORT: | |
705 case T_CHAR: | |
706 case T_BOOLEAN: | |
707 slot_type = T_INT; | |
708 break; | |
709 case T_ARRAY: | |
710 slot_type = T_OBJECT; | |
711 break; | |
712 }; | |
713 if (_type != slot_type) { | |
714 _result = JVMTI_ERROR_TYPE_MISMATCH; | |
715 return false; | |
716 } | |
717 | |
718 jobject jobj = _value.l; | |
719 if (_set && slot_type == T_OBJECT && jobj != NULL) { // NULL reference is allowed | |
720 // Check that the jobject class matches the return type signature. | |
721 JavaThread* cur_thread = JavaThread::current(); | |
722 HandleMark hm(cur_thread); | |
723 | |
724 Handle obj = Handle(cur_thread, JNIHandles::resolve_external_guard(jobj)); | |
725 NULL_CHECK(obj, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
726 KlassHandle ob_kh = KlassHandle(cur_thread, obj->klass()); | |
727 NULL_CHECK(ob_kh, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
728 | |
6983 | 729 if (!is_assignable(signature, ob_kh(), cur_thread)) { |
0 | 730 _result = JVMTI_ERROR_TYPE_MISMATCH; |
731 return false; | |
732 } | |
733 } | |
734 return true; | |
735 } | |
736 | |
737 static bool can_be_deoptimized(vframe* vf) { | |
738 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized()); | |
739 } | |
740 | |
741 bool VM_GetOrSetLocal::doit_prologue() { | |
742 _jvf = get_java_vframe(); | |
743 NULL_CHECK(_jvf, false); | |
744 | |
2019 | 745 if (_jvf->method()->is_native()) { |
746 if (getting_receiver() && !_jvf->method()->is_static()) { | |
747 return true; | |
748 } else { | |
749 _result = JVMTI_ERROR_OPAQUE_FRAME; | |
750 return false; | |
751 } | |
752 } | |
753 | |
0 | 754 if (!check_slot_type(_jvf)) { |
755 return false; | |
756 } | |
757 return true; | |
758 } | |
759 | |
760 void VM_GetOrSetLocal::doit() { | |
761 if (_set) { | |
762 // Force deoptimization of frame if compiled because it's | |
763 // possible the compiler emitted some locals as constant values, | |
764 // meaning they are not mutable. | |
765 if (can_be_deoptimized(_jvf)) { | |
766 | |
767 // Schedule deoptimization so that eventually the local | |
768 // update will be written to an interpreter frame. | |
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769 Deoptimization::deoptimize_frame(_jvf->thread(), _jvf->fr().id()); |
0 | 770 |
771 // Now store a new value for the local which will be applied | |
772 // once deoptimization occurs. Note however that while this | |
773 // write is deferred until deoptimization actually happens | |
774 // can vframe created after this point will have its locals | |
775 // reflecting this update so as far as anyone can see the | |
776 // write has already taken place. | |
777 | |
778 // If we are updating an oop then get the oop from the handle | |
779 // since the handle will be long gone by the time the deopt | |
780 // happens. The oop stored in the deferred local will be | |
781 // gc'd on its own. | |
782 if (_type == T_OBJECT) { | |
783 _value.l = (jobject) (JNIHandles::resolve_external_guard(_value.l)); | |
784 } | |
785 // Re-read the vframe so we can see that it is deoptimized | |
786 // [ Only need because of assert in update_local() ] | |
787 _jvf = get_java_vframe(); | |
788 ((compiledVFrame*)_jvf)->update_local(_type, _index, _value); | |
789 return; | |
790 } | |
791 StackValueCollection *locals = _jvf->locals(); | |
792 HandleMark hm; | |
793 | |
794 switch (_type) { | |
2019 | 795 case T_INT: locals->set_int_at (_index, _value.i); break; |
796 case T_LONG: locals->set_long_at (_index, _value.j); break; | |
797 case T_FLOAT: locals->set_float_at (_index, _value.f); break; | |
798 case T_DOUBLE: locals->set_double_at(_index, _value.d); break; | |
799 case T_OBJECT: { | |
800 Handle ob_h(JNIHandles::resolve_external_guard(_value.l)); | |
801 locals->set_obj_at (_index, ob_h); | |
802 break; | |
803 } | |
804 default: ShouldNotReachHere(); | |
0 | 805 } |
806 _jvf->set_locals(locals); | |
807 } else { | |
2019 | 808 if (_jvf->method()->is_native() && _jvf->is_compiled_frame()) { |
809 assert(getting_receiver(), "Can only get here when getting receiver"); | |
810 oop receiver = _jvf->fr().get_native_receiver(); | |
811 _value.l = JNIHandles::make_local(_calling_thread, receiver); | |
812 } else { | |
813 StackValueCollection *locals = _jvf->locals(); | |
0 | 814 |
2019 | 815 if (locals->at(_index)->type() == T_CONFLICT) { |
816 memset(&_value, 0, sizeof(_value)); | |
817 _value.l = NULL; | |
818 return; | |
819 } | |
0 | 820 |
2019 | 821 switch (_type) { |
822 case T_INT: _value.i = locals->int_at (_index); break; | |
823 case T_LONG: _value.j = locals->long_at (_index); break; | |
824 case T_FLOAT: _value.f = locals->float_at (_index); break; | |
825 case T_DOUBLE: _value.d = locals->double_at(_index); break; | |
826 case T_OBJECT: { | |
827 // Wrap the oop to be returned in a local JNI handle since | |
828 // oops_do() no longer applies after doit() is finished. | |
829 oop obj = locals->obj_at(_index)(); | |
830 _value.l = JNIHandles::make_local(_calling_thread, obj); | |
831 break; | |
832 } | |
833 default: ShouldNotReachHere(); | |
834 } | |
0 | 835 } |
836 } | |
837 } | |
838 | |
839 | |
840 bool VM_GetOrSetLocal::allow_nested_vm_operations() const { | |
841 return true; // May need to deoptimize | |
842 } | |
843 | |
844 | |
2019 | 845 VM_GetReceiver::VM_GetReceiver( |
846 JavaThread* thread, JavaThread* caller_thread, jint depth) | |
847 : VM_GetOrSetLocal(thread, caller_thread, depth, 0) {} | |
848 | |
0 | 849 ///////////////////////////////////////////////////////////////////////////////////////// |
850 | |
851 // | |
852 // class JvmtiSuspendControl - see comments in jvmtiImpl.hpp | |
853 // | |
854 | |
855 bool JvmtiSuspendControl::suspend(JavaThread *java_thread) { | |
856 // external suspend should have caught suspending a thread twice | |
857 | |
858 // Immediate suspension required for JPDA back-end so JVMTI agent threads do | |
859 // not deadlock due to later suspension on transitions while holding | |
860 // raw monitors. Passing true causes the immediate suspension. | |
861 // java_suspend() will catch threads in the process of exiting | |
862 // and will ignore them. | |
863 java_thread->java_suspend(); | |
864 | |
865 // It would be nice to have the following assertion in all the time, | |
866 // but it is possible for a racing resume request to have resumed | |
867 // this thread right after we suspended it. Temporarily enable this | |
868 // assertion if you are chasing a different kind of bug. | |
869 // | |
870 // assert(java_lang_Thread::thread(java_thread->threadObj()) == NULL || | |
871 // java_thread->is_being_ext_suspended(), "thread is not suspended"); | |
872 | |
873 if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) { | |
874 // check again because we can get delayed in java_suspend(): | |
875 // the thread is in process of exiting. | |
876 return false; | |
877 } | |
878 | |
879 return true; | |
880 } | |
881 | |
882 bool JvmtiSuspendControl::resume(JavaThread *java_thread) { | |
883 // external suspend should have caught resuming a thread twice | |
884 assert(java_thread->is_being_ext_suspended(), "thread should be suspended"); | |
885 | |
886 // resume thread | |
887 { | |
888 // must always grab Threads_lock, see JVM_SuspendThread | |
889 MutexLocker ml(Threads_lock); | |
890 java_thread->java_resume(); | |
891 } | |
892 | |
893 return true; | |
894 } | |
895 | |
896 | |
897 void JvmtiSuspendControl::print() { | |
898 #ifndef PRODUCT | |
899 MutexLocker mu(Threads_lock); | |
900 ResourceMark rm; | |
901 | |
902 tty->print("Suspended Threads: ["); | |
903 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
904 #if JVMTI_TRACE | |
905 const char *name = JvmtiTrace::safe_get_thread_name(thread); | |
906 #else | |
907 const char *name = ""; | |
908 #endif /*JVMTI_TRACE */ | |
909 tty->print("%s(%c ", name, thread->is_being_ext_suspended() ? 'S' : '_'); | |
910 if (!thread->has_last_Java_frame()) { | |
911 tty->print("no stack"); | |
912 } | |
913 tty->print(") "); | |
914 } | |
915 tty->print_cr("]"); | |
916 #endif | |
917 } | |
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919 #ifndef KERNEL |
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920 |
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921 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_load_event( |
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922 nmethod* nm) { |
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923 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_LOAD); |
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924 event._event_data.compiled_method_load = nm; |
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925 // Keep the nmethod alive until the ServiceThread can process |
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926 // this deferred event. |
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927 nmethodLocker::lock_nmethod(nm); |
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928 return event; |
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929 } |
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930 |
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931 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_unload_event( |
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932 nmethod* nm, jmethodID id, const void* code) { |
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933 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_UNLOAD); |
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934 event._event_data.compiled_method_unload.nm = nm; |
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935 event._event_data.compiled_method_unload.method_id = id; |
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936 event._event_data.compiled_method_unload.code_begin = code; |
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937 // Keep the nmethod alive until the ServiceThread can process |
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938 // this deferred event. This will keep the memory for the |
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939 // generated code from being reused too early. We pass |
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940 // zombie_ok == true here so that our nmethod that was just |
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941 // made into a zombie can be locked. |
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942 nmethodLocker::lock_nmethod(nm, true /* zombie_ok */); |
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943 return event; |
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944 } |
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945 |
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946 JvmtiDeferredEvent JvmtiDeferredEvent::dynamic_code_generated_event( |
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947 const char* name, const void* code_begin, const void* code_end) { |
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948 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_DYNAMIC_CODE_GENERATED); |
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949 // Need to make a copy of the name since we don't know how long |
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950 // the event poster will keep it around after we enqueue the |
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951 // deferred event and return. strdup() failure is handled in |
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952 // the post() routine below. |
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953 event._event_data.dynamic_code_generated.name = os::strdup(name); |
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954 event._event_data.dynamic_code_generated.code_begin = code_begin; |
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955 event._event_data.dynamic_code_generated.code_end = code_end; |
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956 return event; |
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957 } |
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958 |
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959 void JvmtiDeferredEvent::post() { |
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960 assert(ServiceThread::is_service_thread(Thread::current()), |
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961 "Service thread must post enqueued events"); |
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962 switch(_type) { |
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963 case TYPE_COMPILED_METHOD_LOAD: { |
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964 nmethod* nm = _event_data.compiled_method_load; |
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965 JvmtiExport::post_compiled_method_load(nm); |
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966 // done with the deferred event so unlock the nmethod |
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967 nmethodLocker::unlock_nmethod(nm); |
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968 break; |
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969 } |
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970 case TYPE_COMPILED_METHOD_UNLOAD: { |
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971 nmethod* nm = _event_data.compiled_method_unload.nm; |
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972 JvmtiExport::post_compiled_method_unload( |
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973 _event_data.compiled_method_unload.method_id, |
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974 _event_data.compiled_method_unload.code_begin); |
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975 // done with the deferred event so unlock the nmethod |
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976 nmethodLocker::unlock_nmethod(nm); |
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977 break; |
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978 } |
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979 case TYPE_DYNAMIC_CODE_GENERATED: { |
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980 JvmtiExport::post_dynamic_code_generated_internal( |
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981 // if strdup failed give the event a default name |
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982 (_event_data.dynamic_code_generated.name == NULL) |
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983 ? "unknown_code" : _event_data.dynamic_code_generated.name, |
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984 _event_data.dynamic_code_generated.code_begin, |
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985 _event_data.dynamic_code_generated.code_end); |
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986 if (_event_data.dynamic_code_generated.name != NULL) { |
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987 // release our copy |
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988 os::free((void *)_event_data.dynamic_code_generated.name); |
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989 } |
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990 break; |
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991 } |
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992 default: |
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993 ShouldNotReachHere(); |
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994 } |
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995 } |
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996 |
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997 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_tail = NULL; |
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998 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_head = NULL; |
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999 |
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1000 volatile JvmtiDeferredEventQueue::QueueNode* |
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1001 JvmtiDeferredEventQueue::_pending_list = NULL; |
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1002 |
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1003 bool JvmtiDeferredEventQueue::has_events() { |
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1004 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1005 return _queue_head != NULL || _pending_list != NULL; |
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1006 } |
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1007 |
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1008 void JvmtiDeferredEventQueue::enqueue(const JvmtiDeferredEvent& event) { |
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1009 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1010 |
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1011 process_pending_events(); |
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1012 |
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1013 // Events get added to the end of the queue (and are pulled off the front). |
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1014 QueueNode* node = new QueueNode(event); |
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1015 if (_queue_tail == NULL) { |
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1016 _queue_tail = _queue_head = node; |
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1017 } else { |
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1018 assert(_queue_tail->next() == NULL, "Must be the last element in the list"); |
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1019 _queue_tail->set_next(node); |
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1020 _queue_tail = node; |
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1021 } |
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1022 |
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1023 Service_lock->notify_all(); |
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1024 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1025 "Inconsistent queue markers"); |
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1026 } |
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1027 |
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1028 JvmtiDeferredEvent JvmtiDeferredEventQueue::dequeue() { |
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1029 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1030 |
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1031 process_pending_events(); |
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1032 |
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1033 assert(_queue_head != NULL, "Nothing to dequeue"); |
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1034 |
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1035 if (_queue_head == NULL) { |
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1036 // Just in case this happens in product; it shouldn't but let's not crash |
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1037 return JvmtiDeferredEvent(); |
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1038 } |
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1039 |
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1040 QueueNode* node = _queue_head; |
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1041 _queue_head = _queue_head->next(); |
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1042 if (_queue_head == NULL) { |
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1043 _queue_tail = NULL; |
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1044 } |
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1045 |
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1046 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1047 "Inconsistent queue markers"); |
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1048 |
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1049 JvmtiDeferredEvent event = node->event(); |
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1050 delete node; |
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1051 return event; |
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1052 } |
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1053 |
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1054 void JvmtiDeferredEventQueue::add_pending_event( |
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1055 const JvmtiDeferredEvent& event) { |
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1056 |
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1057 QueueNode* node = new QueueNode(event); |
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1058 |
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1059 bool success = false; |
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1060 QueueNode* prev_value = (QueueNode*)_pending_list; |
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1061 do { |
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1062 node->set_next(prev_value); |
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1063 prev_value = (QueueNode*)Atomic::cmpxchg_ptr( |
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1064 (void*)node, (volatile void*)&_pending_list, (void*)node->next()); |
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1065 } while (prev_value != node->next()); |
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1066 } |
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1067 |
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1068 // This method transfers any events that were added by someone NOT holding |
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1069 // the lock into the mainline queue. |
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1070 void JvmtiDeferredEventQueue::process_pending_events() { |
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1071 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1072 |
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1073 if (_pending_list != NULL) { |
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1074 QueueNode* head = |
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1075 (QueueNode*)Atomic::xchg_ptr(NULL, (volatile void*)&_pending_list); |
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1076 |
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1077 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1078 "Inconsistent queue markers"); |
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1079 |
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1080 if (head != NULL) { |
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1081 // Since we've treated the pending list as a stack (with newer |
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1082 // events at the beginning), we need to join the bottom of the stack |
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1083 // with the 'tail' of the queue in order to get the events in the |
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1084 // right order. We do this by reversing the pending list and appending |
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1085 // it to the queue. |
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1086 |
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1087 QueueNode* new_tail = head; |
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1088 QueueNode* new_head = NULL; |
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1089 |
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1090 // This reverses the list |
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1091 QueueNode* prev = new_tail; |
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1092 QueueNode* node = new_tail->next(); |
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1093 new_tail->set_next(NULL); |
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1094 while (node != NULL) { |
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1095 QueueNode* next = node->next(); |
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1096 node->set_next(prev); |
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1097 prev = node; |
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1098 node = next; |
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1099 } |
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1100 new_head = prev; |
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1101 |
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1102 // Now append the new list to the queue |
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1103 if (_queue_tail != NULL) { |
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1104 _queue_tail->set_next(new_head); |
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1105 } else { // _queue_head == NULL |
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1106 _queue_head = new_head; |
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1107 } |
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1108 _queue_tail = new_tail; |
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1109 } |
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1110 } |
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1111 } |
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1112 |
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1113 #endif // ndef KERNEL |