Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiImpl.cpp @ 1766:02f0a9b6f654
6969586: OptimizeStringConcat: SIGSEGV in LoadNode::Value()
Reviewed-by: kvn
author | never |
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date | Mon, 30 Aug 2010 17:27:35 -0700 |
parents | c18cbe5936b8 |
children | fa83ab460c54 ce6848d0666d |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2007, 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 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_jvmtiImpl.cpp.incl" | |
27 | |
28 GrowableArray<JvmtiRawMonitor*> *JvmtiPendingMonitors::_monitors = new (ResourceObj::C_HEAP) GrowableArray<JvmtiRawMonitor*>(1,true); | |
29 | |
30 void JvmtiPendingMonitors::transition_raw_monitors() { | |
31 assert((Threads::number_of_threads()==1), | |
32 "Java thread has not created yet or more than one java thread \ | |
33 is running. Raw monitor transition will not work"); | |
34 JavaThread *current_java_thread = JavaThread::current(); | |
35 assert(current_java_thread->thread_state() == _thread_in_vm, "Must be in vm"); | |
36 { | |
37 ThreadBlockInVM __tbivm(current_java_thread); | |
38 for(int i=0; i< count(); i++) { | |
39 JvmtiRawMonitor *rmonitor = monitors()->at(i); | |
40 int r = rmonitor->raw_enter(current_java_thread); | |
41 assert(r == ObjectMonitor::OM_OK, "raw_enter should have worked"); | |
42 } | |
43 } | |
44 // pending monitors are converted to real monitor so delete them all. | |
45 dispose(); | |
46 } | |
47 | |
48 // | |
49 // class JvmtiAgentThread | |
50 // | |
51 // JavaThread used to wrap a thread started by an agent | |
52 // using the JVMTI method RunAgentThread. | |
53 // | |
54 | |
55 JvmtiAgentThread::JvmtiAgentThread(JvmtiEnv* env, jvmtiStartFunction start_fn, const void *start_arg) | |
56 : JavaThread(start_function_wrapper) { | |
57 _env = env; | |
58 _start_fn = start_fn; | |
59 _start_arg = start_arg; | |
60 } | |
61 | |
62 void | |
63 JvmtiAgentThread::start_function_wrapper(JavaThread *thread, TRAPS) { | |
64 // It is expected that any Agent threads will be created as | |
65 // Java Threads. If this is the case, notification of the creation | |
66 // of the thread is given in JavaThread::thread_main(). | |
67 assert(thread->is_Java_thread(), "debugger thread should be a Java Thread"); | |
68 assert(thread == JavaThread::current(), "sanity check"); | |
69 | |
70 JvmtiAgentThread *dthread = (JvmtiAgentThread *)thread; | |
71 dthread->call_start_function(); | |
72 } | |
73 | |
74 void | |
75 JvmtiAgentThread::call_start_function() { | |
76 ThreadToNativeFromVM transition(this); | |
77 _start_fn(_env->jvmti_external(), jni_environment(), (void*)_start_arg); | |
78 } | |
79 | |
80 | |
81 // | |
82 // class GrowableCache - private methods | |
83 // | |
84 | |
85 void GrowableCache::recache() { | |
86 int len = _elements->length(); | |
87 | |
88 FREE_C_HEAP_ARRAY(address, _cache); | |
89 _cache = NEW_C_HEAP_ARRAY(address,len+1); | |
90 | |
91 for (int i=0; i<len; i++) { | |
92 _cache[i] = _elements->at(i)->getCacheValue(); | |
93 // | |
94 // The cache entry has gone bad. Without a valid frame pointer | |
95 // value, the entry is useless so we simply delete it in product | |
96 // mode. The call to remove() will rebuild the cache again | |
97 // without the bad entry. | |
98 // | |
99 if (_cache[i] == NULL) { | |
100 assert(false, "cannot recache NULL elements"); | |
101 remove(i); | |
102 return; | |
103 } | |
104 } | |
105 _cache[len] = NULL; | |
106 | |
107 _listener_fun(_this_obj,_cache); | |
108 } | |
109 | |
110 bool GrowableCache::equals(void* v, GrowableElement *e2) { | |
111 GrowableElement *e1 = (GrowableElement *) v; | |
112 assert(e1 != NULL, "e1 != NULL"); | |
113 assert(e2 != NULL, "e2 != NULL"); | |
114 | |
115 return e1->equals(e2); | |
116 } | |
117 | |
118 // | |
119 // class GrowableCache - public methods | |
120 // | |
121 | |
122 GrowableCache::GrowableCache() { | |
123 _this_obj = NULL; | |
124 _listener_fun = NULL; | |
125 _elements = NULL; | |
126 _cache = NULL; | |
127 } | |
128 | |
129 GrowableCache::~GrowableCache() { | |
130 clear(); | |
131 delete _elements; | |
132 FREE_C_HEAP_ARRAY(address, _cache); | |
133 } | |
134 | |
135 void GrowableCache::initialize(void *this_obj, void listener_fun(void *, address*) ) { | |
136 _this_obj = this_obj; | |
137 _listener_fun = listener_fun; | |
138 _elements = new (ResourceObj::C_HEAP) GrowableArray<GrowableElement*>(5,true); | |
139 recache(); | |
140 } | |
141 | |
142 // number of elements in the collection | |
143 int GrowableCache::length() { | |
144 return _elements->length(); | |
145 } | |
146 | |
147 // get the value of the index element in the collection | |
148 GrowableElement* GrowableCache::at(int index) { | |
149 GrowableElement *e = (GrowableElement *) _elements->at(index); | |
150 assert(e != NULL, "e != NULL"); | |
151 return e; | |
152 } | |
153 | |
154 int GrowableCache::find(GrowableElement* e) { | |
155 return _elements->find(e, GrowableCache::equals); | |
156 } | |
157 | |
158 // append a copy of the element to the end of the collection | |
159 void GrowableCache::append(GrowableElement* e) { | |
160 GrowableElement *new_e = e->clone(); | |
161 _elements->append(new_e); | |
162 recache(); | |
163 } | |
164 | |
165 // insert a copy of the element using lessthan() | |
166 void GrowableCache::insert(GrowableElement* e) { | |
167 GrowableElement *new_e = e->clone(); | |
168 _elements->append(new_e); | |
169 | |
170 int n = length()-2; | |
171 for (int i=n; i>=0; i--) { | |
172 GrowableElement *e1 = _elements->at(i); | |
173 GrowableElement *e2 = _elements->at(i+1); | |
174 if (e2->lessThan(e1)) { | |
175 _elements->at_put(i+1, e1); | |
176 _elements->at_put(i, e2); | |
177 } | |
178 } | |
179 | |
180 recache(); | |
181 } | |
182 | |
183 // remove the element at index | |
184 void GrowableCache::remove (int index) { | |
185 GrowableElement *e = _elements->at(index); | |
186 assert(e != NULL, "e != NULL"); | |
187 _elements->remove(e); | |
188 delete e; | |
189 recache(); | |
190 } | |
191 | |
192 // clear out all elements, release all heap space and | |
193 // let our listener know that things have changed. | |
194 void GrowableCache::clear() { | |
195 int len = _elements->length(); | |
196 for (int i=0; i<len; i++) { | |
197 delete _elements->at(i); | |
198 } | |
199 _elements->clear(); | |
200 recache(); | |
201 } | |
202 | |
203 void GrowableCache::oops_do(OopClosure* f) { | |
204 int len = _elements->length(); | |
205 for (int i=0; i<len; i++) { | |
206 GrowableElement *e = _elements->at(i); | |
207 e->oops_do(f); | |
208 } | |
209 } | |
210 | |
211 void GrowableCache::gc_epilogue() { | |
212 int len = _elements->length(); | |
213 // recompute the new cache value after GC | |
214 for (int i=0; i<len; i++) { | |
215 _cache[i] = _elements->at(i)->getCacheValue(); | |
216 } | |
217 } | |
218 | |
219 | |
220 // | |
221 // class JvmtiRawMonitor | |
222 // | |
223 | |
224 JvmtiRawMonitor::JvmtiRawMonitor(const char *name) { | |
225 #ifdef ASSERT | |
226 _name = strcpy(NEW_C_HEAP_ARRAY(char, strlen(name) + 1), name); | |
227 #else | |
228 _name = NULL; | |
229 #endif | |
230 _magic = JVMTI_RM_MAGIC; | |
231 } | |
232 | |
233 JvmtiRawMonitor::~JvmtiRawMonitor() { | |
234 #ifdef ASSERT | |
235 FreeHeap(_name); | |
236 #endif | |
237 _magic = 0; | |
238 } | |
239 | |
240 | |
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241 bool |
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242 JvmtiRawMonitor::is_valid() { |
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243 int value = 0; |
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244 |
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245 // This object might not be a JvmtiRawMonitor so we can't assume |
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246 // the _magic field is properly aligned. Get the value in a safe |
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247 // way and then check against JVMTI_RM_MAGIC. |
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248 |
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249 switch (sizeof(_magic)) { |
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250 case 2: |
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251 value = Bytes::get_native_u2((address)&_magic); |
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252 break; |
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253 |
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254 case 4: |
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255 value = Bytes::get_native_u4((address)&_magic); |
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256 break; |
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257 |
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258 case 8: |
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259 value = Bytes::get_native_u8((address)&_magic); |
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260 break; |
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261 |
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262 default: |
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263 guarantee(false, "_magic field is an unexpected size"); |
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264 } |
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265 |
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266 return value == JVMTI_RM_MAGIC; |
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267 } |
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268 |
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269 |
0 | 270 // |
271 // class JvmtiBreakpoint | |
272 // | |
273 | |
274 JvmtiBreakpoint::JvmtiBreakpoint() { | |
275 _method = NULL; | |
276 _bci = 0; | |
277 #ifdef CHECK_UNHANDLED_OOPS | |
278 // This one is always allocated with new, but check it just in case. | |
279 Thread *thread = Thread::current(); | |
280 if (thread->is_in_stack((address)&_method)) { | |
281 thread->allow_unhandled_oop((oop*)&_method); | |
282 } | |
283 #endif // CHECK_UNHANDLED_OOPS | |
284 } | |
285 | |
286 JvmtiBreakpoint::JvmtiBreakpoint(methodOop m_method, jlocation location) { | |
287 _method = m_method; | |
288 assert(_method != NULL, "_method != NULL"); | |
289 _bci = (int) location; | |
290 #ifdef CHECK_UNHANDLED_OOPS | |
291 // Could be allocated with new and wouldn't be on the unhandled oop list. | |
292 Thread *thread = Thread::current(); | |
293 if (thread->is_in_stack((address)&_method)) { | |
294 thread->allow_unhandled_oop(&_method); | |
295 } | |
296 #endif // CHECK_UNHANDLED_OOPS | |
297 | |
298 assert(_bci >= 0, "_bci >= 0"); | |
299 } | |
300 | |
301 void JvmtiBreakpoint::copy(JvmtiBreakpoint& bp) { | |
302 _method = bp._method; | |
303 _bci = bp._bci; | |
304 } | |
305 | |
306 bool JvmtiBreakpoint::lessThan(JvmtiBreakpoint& bp) { | |
307 Unimplemented(); | |
308 return false; | |
309 } | |
310 | |
311 bool JvmtiBreakpoint::equals(JvmtiBreakpoint& bp) { | |
312 return _method == bp._method | |
313 && _bci == bp._bci; | |
314 } | |
315 | |
316 bool JvmtiBreakpoint::is_valid() { | |
317 return _method != NULL && | |
318 _bci >= 0; | |
319 } | |
320 | |
321 address JvmtiBreakpoint::getBcp() { | |
322 return _method->bcp_from(_bci); | |
323 } | |
324 | |
325 void JvmtiBreakpoint::each_method_version_do(method_action meth_act) { | |
326 ((methodOopDesc*)_method->*meth_act)(_bci); | |
327 | |
328 // add/remove breakpoint to/from versions of the method that | |
329 // are EMCP. Directly or transitively obsolete methods are | |
330 // not saved in the PreviousVersionInfo. | |
331 Thread *thread = Thread::current(); | |
332 instanceKlassHandle ikh = instanceKlassHandle(thread, _method->method_holder()); | |
333 symbolOop m_name = _method->name(); | |
334 symbolOop m_signature = _method->signature(); | |
335 | |
336 { | |
337 ResourceMark rm(thread); | |
338 // PreviousVersionInfo objects returned via PreviousVersionWalker | |
339 // contain a GrowableArray of handles. We have to clean up the | |
340 // GrowableArray _after_ the PreviousVersionWalker destructor | |
341 // has destroyed the handles. | |
342 { | |
343 // search previous versions if they exist | |
344 PreviousVersionWalker pvw((instanceKlass *)ikh()->klass_part()); | |
345 for (PreviousVersionInfo * pv_info = pvw.next_previous_version(); | |
346 pv_info != NULL; pv_info = pvw.next_previous_version()) { | |
347 GrowableArray<methodHandle>* methods = | |
348 pv_info->prev_EMCP_method_handles(); | |
349 | |
350 if (methods == NULL) { | |
351 // We have run into a PreviousVersion generation where | |
352 // all methods were made obsolete during that generation's | |
353 // RedefineClasses() operation. At the time of that | |
354 // operation, all EMCP methods were flushed so we don't | |
355 // have to go back any further. | |
356 // | |
357 // A NULL methods array is different than an empty methods | |
358 // array. We cannot infer any optimizations about older | |
359 // generations from an empty methods array for the current | |
360 // generation. | |
361 break; | |
362 } | |
363 | |
364 for (int i = methods->length() - 1; i >= 0; i--) { | |
365 methodHandle method = methods->at(i); | |
366 if (method->name() == m_name && method->signature() == m_signature) { | |
367 RC_TRACE(0x00000800, ("%sing breakpoint in %s(%s)", | |
368 meth_act == &methodOopDesc::set_breakpoint ? "sett" : "clear", | |
369 method->name()->as_C_string(), | |
370 method->signature()->as_C_string())); | |
371 assert(!method->is_obsolete(), "only EMCP methods here"); | |
372 | |
373 ((methodOopDesc*)method()->*meth_act)(_bci); | |
374 break; | |
375 } | |
376 } | |
377 } | |
378 } // pvw is cleaned up | |
379 } // rm is cleaned up | |
380 } | |
381 | |
382 void JvmtiBreakpoint::set() { | |
383 each_method_version_do(&methodOopDesc::set_breakpoint); | |
384 } | |
385 | |
386 void JvmtiBreakpoint::clear() { | |
387 each_method_version_do(&methodOopDesc::clear_breakpoint); | |
388 } | |
389 | |
390 void JvmtiBreakpoint::print() { | |
391 #ifndef PRODUCT | |
392 const char *class_name = (_method == NULL) ? "NULL" : _method->klass_name()->as_C_string(); | |
393 const char *method_name = (_method == NULL) ? "NULL" : _method->name()->as_C_string(); | |
394 | |
395 tty->print("Breakpoint(%s,%s,%d,%p)",class_name, method_name, _bci, getBcp()); | |
396 #endif | |
397 } | |
398 | |
399 | |
400 // | |
401 // class VM_ChangeBreakpoints | |
402 // | |
403 // Modify the Breakpoints data structure at a safepoint | |
404 // | |
405 | |
406 void VM_ChangeBreakpoints::doit() { | |
407 switch (_operation) { | |
408 case SET_BREAKPOINT: | |
409 _breakpoints->set_at_safepoint(*_bp); | |
410 break; | |
411 case CLEAR_BREAKPOINT: | |
412 _breakpoints->clear_at_safepoint(*_bp); | |
413 break; | |
414 case CLEAR_ALL_BREAKPOINT: | |
415 _breakpoints->clearall_at_safepoint(); | |
416 break; | |
417 default: | |
418 assert(false, "Unknown operation"); | |
419 } | |
420 } | |
421 | |
422 void VM_ChangeBreakpoints::oops_do(OopClosure* f) { | |
423 // This operation keeps breakpoints alive | |
424 if (_breakpoints != NULL) { | |
425 _breakpoints->oops_do(f); | |
426 } | |
427 if (_bp != NULL) { | |
428 _bp->oops_do(f); | |
429 } | |
430 } | |
431 | |
432 // | |
433 // class JvmtiBreakpoints | |
434 // | |
435 // a JVMTI internal collection of JvmtiBreakpoint | |
436 // | |
437 | |
438 JvmtiBreakpoints::JvmtiBreakpoints(void listener_fun(void *,address *)) { | |
439 _bps.initialize(this,listener_fun); | |
440 } | |
441 | |
442 JvmtiBreakpoints:: ~JvmtiBreakpoints() {} | |
443 | |
444 void JvmtiBreakpoints::oops_do(OopClosure* f) { | |
445 _bps.oops_do(f); | |
446 } | |
447 | |
448 void JvmtiBreakpoints::gc_epilogue() { | |
449 _bps.gc_epilogue(); | |
450 } | |
451 | |
452 void JvmtiBreakpoints::print() { | |
453 #ifndef PRODUCT | |
454 ResourceMark rm; | |
455 | |
456 int n = _bps.length(); | |
457 for (int i=0; i<n; i++) { | |
458 JvmtiBreakpoint& bp = _bps.at(i); | |
459 tty->print("%d: ", i); | |
460 bp.print(); | |
461 tty->print_cr(""); | |
462 } | |
463 #endif | |
464 } | |
465 | |
466 | |
467 void JvmtiBreakpoints::set_at_safepoint(JvmtiBreakpoint& bp) { | |
468 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
469 | |
470 int i = _bps.find(bp); | |
471 if (i == -1) { | |
472 _bps.append(bp); | |
473 bp.set(); | |
474 } | |
475 } | |
476 | |
477 void JvmtiBreakpoints::clear_at_safepoint(JvmtiBreakpoint& bp) { | |
478 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
479 | |
480 int i = _bps.find(bp); | |
481 if (i != -1) { | |
482 _bps.remove(i); | |
483 bp.clear(); | |
484 } | |
485 } | |
486 | |
487 void JvmtiBreakpoints::clearall_at_safepoint() { | |
488 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
489 | |
490 int len = _bps.length(); | |
491 for (int i=0; i<len; i++) { | |
492 _bps.at(i).clear(); | |
493 } | |
494 _bps.clear(); | |
495 } | |
496 | |
497 int JvmtiBreakpoints::length() { return _bps.length(); } | |
498 | |
499 int JvmtiBreakpoints::set(JvmtiBreakpoint& bp) { | |
500 if ( _bps.find(bp) != -1) { | |
501 return JVMTI_ERROR_DUPLICATE; | |
502 } | |
503 VM_ChangeBreakpoints set_breakpoint(this,VM_ChangeBreakpoints::SET_BREAKPOINT, &bp); | |
504 VMThread::execute(&set_breakpoint); | |
505 return JVMTI_ERROR_NONE; | |
506 } | |
507 | |
508 int JvmtiBreakpoints::clear(JvmtiBreakpoint& bp) { | |
509 if ( _bps.find(bp) == -1) { | |
510 return JVMTI_ERROR_NOT_FOUND; | |
511 } | |
512 | |
513 VM_ChangeBreakpoints clear_breakpoint(this,VM_ChangeBreakpoints::CLEAR_BREAKPOINT, &bp); | |
514 VMThread::execute(&clear_breakpoint); | |
515 return JVMTI_ERROR_NONE; | |
516 } | |
517 | |
518 void JvmtiBreakpoints::clearall_in_class_at_safepoint(klassOop klass) { | |
519 bool changed = true; | |
520 // We are going to run thru the list of bkpts | |
521 // and delete some. This deletion probably alters | |
522 // the list in some implementation defined way such | |
523 // that when we delete entry i, the next entry might | |
524 // no longer be at i+1. To be safe, each time we delete | |
525 // an entry, we'll just start again from the beginning. | |
526 // We'll stop when we make a pass thru the whole list without | |
527 // deleting anything. | |
528 while (changed) { | |
529 int len = _bps.length(); | |
530 changed = false; | |
531 for (int i = 0; i < len; i++) { | |
532 JvmtiBreakpoint& bp = _bps.at(i); | |
533 if (bp.method()->method_holder() == klass) { | |
534 bp.clear(); | |
535 _bps.remove(i); | |
536 // This changed 'i' so we have to start over. | |
537 changed = true; | |
538 break; | |
539 } | |
540 } | |
541 } | |
542 } | |
543 | |
544 void JvmtiBreakpoints::clearall() { | |
545 VM_ChangeBreakpoints clearall_breakpoint(this,VM_ChangeBreakpoints::CLEAR_ALL_BREAKPOINT); | |
546 VMThread::execute(&clearall_breakpoint); | |
547 } | |
548 | |
549 // | |
550 // class JvmtiCurrentBreakpoints | |
551 // | |
552 | |
553 JvmtiBreakpoints *JvmtiCurrentBreakpoints::_jvmti_breakpoints = NULL; | |
554 address * JvmtiCurrentBreakpoints::_breakpoint_list = NULL; | |
555 | |
556 | |
557 JvmtiBreakpoints& JvmtiCurrentBreakpoints::get_jvmti_breakpoints() { | |
558 if (_jvmti_breakpoints != NULL) return (*_jvmti_breakpoints); | |
559 _jvmti_breakpoints = new JvmtiBreakpoints(listener_fun); | |
560 assert(_jvmti_breakpoints != NULL, "_jvmti_breakpoints != NULL"); | |
561 return (*_jvmti_breakpoints); | |
562 } | |
563 | |
564 void JvmtiCurrentBreakpoints::listener_fun(void *this_obj, address *cache) { | |
565 JvmtiBreakpoints *this_jvmti = (JvmtiBreakpoints *) this_obj; | |
566 assert(this_jvmti != NULL, "this_jvmti != NULL"); | |
567 | |
568 debug_only(int n = this_jvmti->length();); | |
569 assert(cache[n] == NULL, "cache must be NULL terminated"); | |
570 | |
571 set_breakpoint_list(cache); | |
572 } | |
573 | |
574 | |
575 void JvmtiCurrentBreakpoints::oops_do(OopClosure* f) { | |
576 if (_jvmti_breakpoints != NULL) { | |
577 _jvmti_breakpoints->oops_do(f); | |
578 } | |
579 } | |
580 | |
581 void JvmtiCurrentBreakpoints::gc_epilogue() { | |
582 if (_jvmti_breakpoints != NULL) { | |
583 _jvmti_breakpoints->gc_epilogue(); | |
584 } | |
585 } | |
586 | |
587 | |
588 /////////////////////////////////////////////////////////////// | |
589 // | |
590 // class VM_GetOrSetLocal | |
591 // | |
592 | |
593 // Constructor for non-object getter | |
594 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type) | |
595 : _thread(thread) | |
596 , _calling_thread(NULL) | |
597 , _depth(depth) | |
598 , _index(index) | |
599 , _type(type) | |
600 , _set(false) | |
601 , _jvf(NULL) | |
602 , _result(JVMTI_ERROR_NONE) | |
603 { | |
604 } | |
605 | |
606 // Constructor for object or non-object setter | |
607 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type, jvalue value) | |
608 : _thread(thread) | |
609 , _calling_thread(NULL) | |
610 , _depth(depth) | |
611 , _index(index) | |
612 , _type(type) | |
613 , _value(value) | |
614 , _set(true) | |
615 , _jvf(NULL) | |
616 , _result(JVMTI_ERROR_NONE) | |
617 { | |
618 } | |
619 | |
620 // Constructor for object getter | |
621 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, int index) | |
622 : _thread(thread) | |
623 , _calling_thread(calling_thread) | |
624 , _depth(depth) | |
625 , _index(index) | |
626 , _type(T_OBJECT) | |
627 , _set(false) | |
628 , _jvf(NULL) | |
629 , _result(JVMTI_ERROR_NONE) | |
630 { | |
631 } | |
632 | |
633 | |
634 vframe *VM_GetOrSetLocal::get_vframe() { | |
635 if (!_thread->has_last_Java_frame()) { | |
636 return NULL; | |
637 } | |
638 RegisterMap reg_map(_thread); | |
639 vframe *vf = _thread->last_java_vframe(®_map); | |
640 int d = 0; | |
641 while ((vf != NULL) && (d < _depth)) { | |
642 vf = vf->java_sender(); | |
643 d++; | |
644 } | |
645 return vf; | |
646 } | |
647 | |
648 javaVFrame *VM_GetOrSetLocal::get_java_vframe() { | |
649 vframe* vf = get_vframe(); | |
650 if (vf == NULL) { | |
651 _result = JVMTI_ERROR_NO_MORE_FRAMES; | |
652 return NULL; | |
653 } | |
654 javaVFrame *jvf = (javaVFrame*)vf; | |
655 | |
656 if (!vf->is_java_frame() || jvf->method()->is_native()) { | |
657 _result = JVMTI_ERROR_OPAQUE_FRAME; | |
658 return NULL; | |
659 } | |
660 return jvf; | |
661 } | |
662 | |
663 // Check that the klass is assignable to a type with the given signature. | |
664 // Another solution could be to use the function Klass::is_subtype_of(type). | |
665 // But the type class can be forced to load/initialize eagerly in such a case. | |
666 // This may cause unexpected consequences like CFLH or class-init JVMTI events. | |
667 // It is better to avoid such a behavior. | |
668 bool VM_GetOrSetLocal::is_assignable(const char* ty_sign, Klass* klass, Thread* thread) { | |
669 assert(ty_sign != NULL, "type signature must not be NULL"); | |
670 assert(thread != NULL, "thread must not be NULL"); | |
671 assert(klass != NULL, "klass must not be NULL"); | |
672 | |
673 int len = (int) strlen(ty_sign); | |
674 if (ty_sign[0] == 'L' && ty_sign[len-1] == ';') { // Need pure class/interface name | |
675 ty_sign++; | |
676 len -= 2; | |
677 } | |
678 symbolHandle ty_sym = oopFactory::new_symbol_handle(ty_sign, len, thread); | |
679 if (klass->name() == ty_sym()) { | |
680 return true; | |
681 } | |
682 // Compare primary supers | |
683 int super_depth = klass->super_depth(); | |
684 int idx; | |
685 for (idx = 0; idx < super_depth; idx++) { | |
686 if (Klass::cast(klass->primary_super_of_depth(idx))->name() == ty_sym()) { | |
687 return true; | |
688 } | |
689 } | |
690 // Compare secondary supers | |
691 objArrayOop sec_supers = klass->secondary_supers(); | |
692 for (idx = 0; idx < sec_supers->length(); idx++) { | |
693 if (Klass::cast((klassOop) sec_supers->obj_at(idx))->name() == ty_sym()) { | |
694 return true; | |
695 } | |
696 } | |
697 return false; | |
698 } | |
699 | |
700 // Checks error conditions: | |
701 // JVMTI_ERROR_INVALID_SLOT | |
702 // JVMTI_ERROR_TYPE_MISMATCH | |
703 // Returns: 'true' - everything is Ok, 'false' - error code | |
704 | |
705 bool VM_GetOrSetLocal::check_slot_type(javaVFrame* jvf) { | |
706 methodOop method_oop = jvf->method(); | |
707 if (!method_oop->has_localvariable_table()) { | |
708 // Just to check index boundaries | |
709 jint extra_slot = (_type == T_LONG || _type == T_DOUBLE) ? 1 : 0; | |
710 if (_index < 0 || _index + extra_slot >= method_oop->max_locals()) { | |
711 _result = JVMTI_ERROR_INVALID_SLOT; | |
712 return false; | |
713 } | |
714 return true; | |
715 } | |
716 | |
717 jint num_entries = method_oop->localvariable_table_length(); | |
718 if (num_entries == 0) { | |
719 _result = JVMTI_ERROR_INVALID_SLOT; | |
720 return false; // There are no slots | |
721 } | |
722 int signature_idx = -1; | |
723 int vf_bci = jvf->bci(); | |
724 LocalVariableTableElement* table = method_oop->localvariable_table_start(); | |
725 for (int i = 0; i < num_entries; i++) { | |
726 int start_bci = table[i].start_bci; | |
727 int end_bci = start_bci + table[i].length; | |
728 | |
729 // Here we assume that locations of LVT entries | |
730 // with the same slot number cannot be overlapped | |
731 if (_index == (jint) table[i].slot && start_bci <= vf_bci && vf_bci <= end_bci) { | |
732 signature_idx = (int) table[i].descriptor_cp_index; | |
733 break; | |
734 } | |
735 } | |
736 if (signature_idx == -1) { | |
737 _result = JVMTI_ERROR_INVALID_SLOT; | |
738 return false; // Incorrect slot index | |
739 } | |
740 symbolOop sign_sym = method_oop->constants()->symbol_at(signature_idx); | |
741 const char* signature = (const char *) sign_sym->as_utf8(); | |
742 BasicType slot_type = char2type(signature[0]); | |
743 | |
744 switch (slot_type) { | |
745 case T_BYTE: | |
746 case T_SHORT: | |
747 case T_CHAR: | |
748 case T_BOOLEAN: | |
749 slot_type = T_INT; | |
750 break; | |
751 case T_ARRAY: | |
752 slot_type = T_OBJECT; | |
753 break; | |
754 }; | |
755 if (_type != slot_type) { | |
756 _result = JVMTI_ERROR_TYPE_MISMATCH; | |
757 return false; | |
758 } | |
759 | |
760 jobject jobj = _value.l; | |
761 if (_set && slot_type == T_OBJECT && jobj != NULL) { // NULL reference is allowed | |
762 // Check that the jobject class matches the return type signature. | |
763 JavaThread* cur_thread = JavaThread::current(); | |
764 HandleMark hm(cur_thread); | |
765 | |
766 Handle obj = Handle(cur_thread, JNIHandles::resolve_external_guard(jobj)); | |
767 NULL_CHECK(obj, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
768 KlassHandle ob_kh = KlassHandle(cur_thread, obj->klass()); | |
769 NULL_CHECK(ob_kh, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
770 | |
771 if (!is_assignable(signature, Klass::cast(ob_kh()), cur_thread)) { | |
772 _result = JVMTI_ERROR_TYPE_MISMATCH; | |
773 return false; | |
774 } | |
775 } | |
776 return true; | |
777 } | |
778 | |
779 static bool can_be_deoptimized(vframe* vf) { | |
780 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized()); | |
781 } | |
782 | |
783 bool VM_GetOrSetLocal::doit_prologue() { | |
784 _jvf = get_java_vframe(); | |
785 NULL_CHECK(_jvf, false); | |
786 | |
787 if (!check_slot_type(_jvf)) { | |
788 return false; | |
789 } | |
790 return true; | |
791 } | |
792 | |
793 void VM_GetOrSetLocal::doit() { | |
794 if (_set) { | |
795 // Force deoptimization of frame if compiled because it's | |
796 // possible the compiler emitted some locals as constant values, | |
797 // meaning they are not mutable. | |
798 if (can_be_deoptimized(_jvf)) { | |
799 | |
800 // Schedule deoptimization so that eventually the local | |
801 // update will be written to an interpreter frame. | |
802 VM_DeoptimizeFrame deopt(_jvf->thread(), _jvf->fr().id()); | |
803 VMThread::execute(&deopt); | |
804 | |
805 // Now store a new value for the local which will be applied | |
806 // once deoptimization occurs. Note however that while this | |
807 // write is deferred until deoptimization actually happens | |
808 // can vframe created after this point will have its locals | |
809 // reflecting this update so as far as anyone can see the | |
810 // write has already taken place. | |
811 | |
812 // If we are updating an oop then get the oop from the handle | |
813 // since the handle will be long gone by the time the deopt | |
814 // happens. The oop stored in the deferred local will be | |
815 // gc'd on its own. | |
816 if (_type == T_OBJECT) { | |
817 _value.l = (jobject) (JNIHandles::resolve_external_guard(_value.l)); | |
818 } | |
819 // Re-read the vframe so we can see that it is deoptimized | |
820 // [ Only need because of assert in update_local() ] | |
821 _jvf = get_java_vframe(); | |
822 ((compiledVFrame*)_jvf)->update_local(_type, _index, _value); | |
823 return; | |
824 } | |
825 StackValueCollection *locals = _jvf->locals(); | |
826 HandleMark hm; | |
827 | |
828 switch (_type) { | |
829 case T_INT: locals->set_int_at (_index, _value.i); break; | |
830 case T_LONG: locals->set_long_at (_index, _value.j); break; | |
831 case T_FLOAT: locals->set_float_at (_index, _value.f); break; | |
832 case T_DOUBLE: locals->set_double_at(_index, _value.d); break; | |
833 case T_OBJECT: { | |
834 Handle ob_h(JNIHandles::resolve_external_guard(_value.l)); | |
835 locals->set_obj_at (_index, ob_h); | |
836 break; | |
837 } | |
838 default: ShouldNotReachHere(); | |
839 } | |
840 _jvf->set_locals(locals); | |
841 } else { | |
842 StackValueCollection *locals = _jvf->locals(); | |
843 | |
844 if (locals->at(_index)->type() == T_CONFLICT) { | |
845 memset(&_value, 0, sizeof(_value)); | |
846 _value.l = NULL; | |
847 return; | |
848 } | |
849 | |
850 switch (_type) { | |
851 case T_INT: _value.i = locals->int_at (_index); break; | |
852 case T_LONG: _value.j = locals->long_at (_index); break; | |
853 case T_FLOAT: _value.f = locals->float_at (_index); break; | |
854 case T_DOUBLE: _value.d = locals->double_at(_index); break; | |
855 case T_OBJECT: { | |
856 // Wrap the oop to be returned in a local JNI handle since | |
857 // oops_do() no longer applies after doit() is finished. | |
858 oop obj = locals->obj_at(_index)(); | |
859 _value.l = JNIHandles::make_local(_calling_thread, obj); | |
860 break; | |
861 } | |
862 default: ShouldNotReachHere(); | |
863 } | |
864 } | |
865 } | |
866 | |
867 | |
868 bool VM_GetOrSetLocal::allow_nested_vm_operations() const { | |
869 return true; // May need to deoptimize | |
870 } | |
871 | |
872 | |
873 ///////////////////////////////////////////////////////////////////////////////////////// | |
874 | |
875 // | |
876 // class JvmtiSuspendControl - see comments in jvmtiImpl.hpp | |
877 // | |
878 | |
879 bool JvmtiSuspendControl::suspend(JavaThread *java_thread) { | |
880 // external suspend should have caught suspending a thread twice | |
881 | |
882 // Immediate suspension required for JPDA back-end so JVMTI agent threads do | |
883 // not deadlock due to later suspension on transitions while holding | |
884 // raw monitors. Passing true causes the immediate suspension. | |
885 // java_suspend() will catch threads in the process of exiting | |
886 // and will ignore them. | |
887 java_thread->java_suspend(); | |
888 | |
889 // It would be nice to have the following assertion in all the time, | |
890 // but it is possible for a racing resume request to have resumed | |
891 // this thread right after we suspended it. Temporarily enable this | |
892 // assertion if you are chasing a different kind of bug. | |
893 // | |
894 // assert(java_lang_Thread::thread(java_thread->threadObj()) == NULL || | |
895 // java_thread->is_being_ext_suspended(), "thread is not suspended"); | |
896 | |
897 if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) { | |
898 // check again because we can get delayed in java_suspend(): | |
899 // the thread is in process of exiting. | |
900 return false; | |
901 } | |
902 | |
903 return true; | |
904 } | |
905 | |
906 bool JvmtiSuspendControl::resume(JavaThread *java_thread) { | |
907 // external suspend should have caught resuming a thread twice | |
908 assert(java_thread->is_being_ext_suspended(), "thread should be suspended"); | |
909 | |
910 // resume thread | |
911 { | |
912 // must always grab Threads_lock, see JVM_SuspendThread | |
913 MutexLocker ml(Threads_lock); | |
914 java_thread->java_resume(); | |
915 } | |
916 | |
917 return true; | |
918 } | |
919 | |
920 | |
921 void JvmtiSuspendControl::print() { | |
922 #ifndef PRODUCT | |
923 MutexLocker mu(Threads_lock); | |
924 ResourceMark rm; | |
925 | |
926 tty->print("Suspended Threads: ["); | |
927 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
928 #if JVMTI_TRACE | |
929 const char *name = JvmtiTrace::safe_get_thread_name(thread); | |
930 #else | |
931 const char *name = ""; | |
932 #endif /*JVMTI_TRACE */ | |
933 tty->print("%s(%c ", name, thread->is_being_ext_suspended() ? 'S' : '_'); | |
934 if (!thread->has_last_Java_frame()) { | |
935 tty->print("no stack"); | |
936 } | |
937 tty->print(") "); | |
938 } | |
939 tty->print_cr("]"); | |
940 #endif | |
941 } |