Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiImpl.cpp @ 1922:5caa30ea147b
Merge
| author | iveresov |
|---|---|
| date | Mon, 08 Nov 2010 14:33:48 -0800 |
| parents | fa83ab460c54 ce6848d0666d |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 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 // | |
| 29 // class JvmtiAgentThread | |
| 30 // | |
| 31 // JavaThread used to wrap a thread started by an agent | |
| 32 // using the JVMTI method RunAgentThread. | |
| 33 // | |
| 34 | |
| 35 JvmtiAgentThread::JvmtiAgentThread(JvmtiEnv* env, jvmtiStartFunction start_fn, const void *start_arg) | |
| 36 : JavaThread(start_function_wrapper) { | |
| 37 _env = env; | |
| 38 _start_fn = start_fn; | |
| 39 _start_arg = start_arg; | |
| 40 } | |
| 41 | |
| 42 void | |
| 43 JvmtiAgentThread::start_function_wrapper(JavaThread *thread, TRAPS) { | |
| 44 // It is expected that any Agent threads will be created as | |
| 45 // Java Threads. If this is the case, notification of the creation | |
| 46 // of the thread is given in JavaThread::thread_main(). | |
| 47 assert(thread->is_Java_thread(), "debugger thread should be a Java Thread"); | |
| 48 assert(thread == JavaThread::current(), "sanity check"); | |
| 49 | |
| 50 JvmtiAgentThread *dthread = (JvmtiAgentThread *)thread; | |
| 51 dthread->call_start_function(); | |
| 52 } | |
| 53 | |
| 54 void | |
| 55 JvmtiAgentThread::call_start_function() { | |
| 56 ThreadToNativeFromVM transition(this); | |
| 57 _start_fn(_env->jvmti_external(), jni_environment(), (void*)_start_arg); | |
| 58 } | |
| 59 | |
| 60 | |
| 61 // | |
| 62 // class GrowableCache - private methods | |
| 63 // | |
| 64 | |
| 65 void GrowableCache::recache() { | |
| 66 int len = _elements->length(); | |
| 67 | |
| 68 FREE_C_HEAP_ARRAY(address, _cache); | |
| 69 _cache = NEW_C_HEAP_ARRAY(address,len+1); | |
| 70 | |
| 71 for (int i=0; i<len; i++) { | |
| 72 _cache[i] = _elements->at(i)->getCacheValue(); | |
| 73 // | |
| 74 // The cache entry has gone bad. Without a valid frame pointer | |
| 75 // value, the entry is useless so we simply delete it in product | |
| 76 // mode. The call to remove() will rebuild the cache again | |
| 77 // without the bad entry. | |
| 78 // | |
| 79 if (_cache[i] == NULL) { | |
| 80 assert(false, "cannot recache NULL elements"); | |
| 81 remove(i); | |
| 82 return; | |
| 83 } | |
| 84 } | |
| 85 _cache[len] = NULL; | |
| 86 | |
| 87 _listener_fun(_this_obj,_cache); | |
| 88 } | |
| 89 | |
| 90 bool GrowableCache::equals(void* v, GrowableElement *e2) { | |
| 91 GrowableElement *e1 = (GrowableElement *) v; | |
| 92 assert(e1 != NULL, "e1 != NULL"); | |
| 93 assert(e2 != NULL, "e2 != NULL"); | |
| 94 | |
| 95 return e1->equals(e2); | |
| 96 } | |
| 97 | |
| 98 // | |
| 99 // class GrowableCache - public methods | |
| 100 // | |
| 101 | |
| 102 GrowableCache::GrowableCache() { | |
| 103 _this_obj = NULL; | |
| 104 _listener_fun = NULL; | |
| 105 _elements = NULL; | |
| 106 _cache = NULL; | |
| 107 } | |
| 108 | |
| 109 GrowableCache::~GrowableCache() { | |
| 110 clear(); | |
| 111 delete _elements; | |
| 112 FREE_C_HEAP_ARRAY(address, _cache); | |
| 113 } | |
| 114 | |
| 115 void GrowableCache::initialize(void *this_obj, void listener_fun(void *, address*) ) { | |
| 116 _this_obj = this_obj; | |
| 117 _listener_fun = listener_fun; | |
| 118 _elements = new (ResourceObj::C_HEAP) GrowableArray<GrowableElement*>(5,true); | |
| 119 recache(); | |
| 120 } | |
| 121 | |
| 122 // number of elements in the collection | |
| 123 int GrowableCache::length() { | |
| 124 return _elements->length(); | |
| 125 } | |
| 126 | |
| 127 // get the value of the index element in the collection | |
| 128 GrowableElement* GrowableCache::at(int index) { | |
| 129 GrowableElement *e = (GrowableElement *) _elements->at(index); | |
| 130 assert(e != NULL, "e != NULL"); | |
| 131 return e; | |
| 132 } | |
| 133 | |
| 134 int GrowableCache::find(GrowableElement* e) { | |
| 135 return _elements->find(e, GrowableCache::equals); | |
| 136 } | |
| 137 | |
| 138 // append a copy of the element to the end of the collection | |
| 139 void GrowableCache::append(GrowableElement* e) { | |
| 140 GrowableElement *new_e = e->clone(); | |
| 141 _elements->append(new_e); | |
| 142 recache(); | |
| 143 } | |
| 144 | |
| 145 // insert a copy of the element using lessthan() | |
| 146 void GrowableCache::insert(GrowableElement* e) { | |
| 147 GrowableElement *new_e = e->clone(); | |
| 148 _elements->append(new_e); | |
| 149 | |
| 150 int n = length()-2; | |
| 151 for (int i=n; i>=0; i--) { | |
| 152 GrowableElement *e1 = _elements->at(i); | |
| 153 GrowableElement *e2 = _elements->at(i+1); | |
| 154 if (e2->lessThan(e1)) { | |
| 155 _elements->at_put(i+1, e1); | |
| 156 _elements->at_put(i, e2); | |
| 157 } | |
| 158 } | |
| 159 | |
| 160 recache(); | |
| 161 } | |
| 162 | |
| 163 // remove the element at index | |
| 164 void GrowableCache::remove (int index) { | |
| 165 GrowableElement *e = _elements->at(index); | |
| 166 assert(e != NULL, "e != NULL"); | |
| 167 _elements->remove(e); | |
| 168 delete e; | |
| 169 recache(); | |
| 170 } | |
| 171 | |
| 172 // clear out all elements, release all heap space and | |
| 173 // let our listener know that things have changed. | |
| 174 void GrowableCache::clear() { | |
| 175 int len = _elements->length(); | |
| 176 for (int i=0; i<len; i++) { | |
| 177 delete _elements->at(i); | |
| 178 } | |
| 179 _elements->clear(); | |
| 180 recache(); | |
| 181 } | |
| 182 | |
| 183 void GrowableCache::oops_do(OopClosure* f) { | |
| 184 int len = _elements->length(); | |
| 185 for (int i=0; i<len; i++) { | |
| 186 GrowableElement *e = _elements->at(i); | |
| 187 e->oops_do(f); | |
| 188 } | |
| 189 } | |
| 190 | |
| 191 void GrowableCache::gc_epilogue() { | |
| 192 int len = _elements->length(); | |
| 193 // recompute the new cache value after GC | |
| 194 for (int i=0; i<len; i++) { | |
| 195 _cache[i] = _elements->at(i)->getCacheValue(); | |
| 196 } | |
| 197 } | |
| 198 | |
| 199 // | |
| 200 // class JvmtiBreakpoint | |
| 201 // | |
| 202 | |
| 203 JvmtiBreakpoint::JvmtiBreakpoint() { | |
| 204 _method = NULL; | |
| 205 _bci = 0; | |
| 206 #ifdef CHECK_UNHANDLED_OOPS | |
| 207 // This one is always allocated with new, but check it just in case. | |
| 208 Thread *thread = Thread::current(); | |
| 209 if (thread->is_in_stack((address)&_method)) { | |
| 210 thread->allow_unhandled_oop((oop*)&_method); | |
| 211 } | |
| 212 #endif // CHECK_UNHANDLED_OOPS | |
| 213 } | |
| 214 | |
| 215 JvmtiBreakpoint::JvmtiBreakpoint(methodOop m_method, jlocation location) { | |
| 216 _method = m_method; | |
| 217 assert(_method != NULL, "_method != NULL"); | |
| 218 _bci = (int) location; | |
| 219 #ifdef CHECK_UNHANDLED_OOPS | |
| 220 // Could be allocated with new and wouldn't be on the unhandled oop list. | |
| 221 Thread *thread = Thread::current(); | |
| 222 if (thread->is_in_stack((address)&_method)) { | |
| 223 thread->allow_unhandled_oop(&_method); | |
| 224 } | |
| 225 #endif // CHECK_UNHANDLED_OOPS | |
| 226 | |
| 227 assert(_bci >= 0, "_bci >= 0"); | |
| 228 } | |
| 229 | |
| 230 void JvmtiBreakpoint::copy(JvmtiBreakpoint& bp) { | |
| 231 _method = bp._method; | |
| 232 _bci = bp._bci; | |
| 233 } | |
| 234 | |
| 235 bool JvmtiBreakpoint::lessThan(JvmtiBreakpoint& bp) { | |
| 236 Unimplemented(); | |
| 237 return false; | |
| 238 } | |
| 239 | |
| 240 bool JvmtiBreakpoint::equals(JvmtiBreakpoint& bp) { | |
| 241 return _method == bp._method | |
| 242 && _bci == bp._bci; | |
| 243 } | |
| 244 | |
| 245 bool JvmtiBreakpoint::is_valid() { | |
| 246 return _method != NULL && | |
| 247 _bci >= 0; | |
| 248 } | |
| 249 | |
| 250 address JvmtiBreakpoint::getBcp() { | |
| 251 return _method->bcp_from(_bci); | |
| 252 } | |
| 253 | |
| 254 void JvmtiBreakpoint::each_method_version_do(method_action meth_act) { | |
| 255 ((methodOopDesc*)_method->*meth_act)(_bci); | |
| 256 | |
| 257 // add/remove breakpoint to/from versions of the method that | |
| 258 // are EMCP. Directly or transitively obsolete methods are | |
| 259 // not saved in the PreviousVersionInfo. | |
| 260 Thread *thread = Thread::current(); | |
| 261 instanceKlassHandle ikh = instanceKlassHandle(thread, _method->method_holder()); | |
| 262 symbolOop m_name = _method->name(); | |
| 263 symbolOop m_signature = _method->signature(); | |
| 264 | |
| 265 { | |
| 266 ResourceMark rm(thread); | |
| 267 // PreviousVersionInfo objects returned via PreviousVersionWalker | |
| 268 // contain a GrowableArray of handles. We have to clean up the | |
| 269 // GrowableArray _after_ the PreviousVersionWalker destructor | |
| 270 // has destroyed the handles. | |
| 271 { | |
| 272 // search previous versions if they exist | |
| 273 PreviousVersionWalker pvw((instanceKlass *)ikh()->klass_part()); | |
| 274 for (PreviousVersionInfo * pv_info = pvw.next_previous_version(); | |
| 275 pv_info != NULL; pv_info = pvw.next_previous_version()) { | |
| 276 GrowableArray<methodHandle>* methods = | |
| 277 pv_info->prev_EMCP_method_handles(); | |
| 278 | |
| 279 if (methods == NULL) { | |
| 280 // We have run into a PreviousVersion generation where | |
| 281 // all methods were made obsolete during that generation's | |
| 282 // RedefineClasses() operation. At the time of that | |
| 283 // operation, all EMCP methods were flushed so we don't | |
| 284 // have to go back any further. | |
| 285 // | |
| 286 // A NULL methods array is different than an empty methods | |
| 287 // array. We cannot infer any optimizations about older | |
| 288 // generations from an empty methods array for the current | |
| 289 // generation. | |
| 290 break; | |
| 291 } | |
| 292 | |
| 293 for (int i = methods->length() - 1; i >= 0; i--) { | |
| 294 methodHandle method = methods->at(i); | |
| 295 if (method->name() == m_name && method->signature() == m_signature) { | |
| 296 RC_TRACE(0x00000800, ("%sing breakpoint in %s(%s)", | |
| 297 meth_act == &methodOopDesc::set_breakpoint ? "sett" : "clear", | |
| 298 method->name()->as_C_string(), | |
| 299 method->signature()->as_C_string())); | |
| 300 assert(!method->is_obsolete(), "only EMCP methods here"); | |
| 301 | |
| 302 ((methodOopDesc*)method()->*meth_act)(_bci); | |
| 303 break; | |
| 304 } | |
| 305 } | |
| 306 } | |
| 307 } // pvw is cleaned up | |
| 308 } // rm is cleaned up | |
| 309 } | |
| 310 | |
| 311 void JvmtiBreakpoint::set() { | |
| 312 each_method_version_do(&methodOopDesc::set_breakpoint); | |
| 313 } | |
| 314 | |
| 315 void JvmtiBreakpoint::clear() { | |
| 316 each_method_version_do(&methodOopDesc::clear_breakpoint); | |
| 317 } | |
| 318 | |
| 319 void JvmtiBreakpoint::print() { | |
| 320 #ifndef PRODUCT | |
| 321 const char *class_name = (_method == NULL) ? "NULL" : _method->klass_name()->as_C_string(); | |
| 322 const char *method_name = (_method == NULL) ? "NULL" : _method->name()->as_C_string(); | |
| 323 | |
| 324 tty->print("Breakpoint(%s,%s,%d,%p)",class_name, method_name, _bci, getBcp()); | |
| 325 #endif | |
| 326 } | |
| 327 | |
| 328 | |
| 329 // | |
| 330 // class VM_ChangeBreakpoints | |
| 331 // | |
| 332 // Modify the Breakpoints data structure at a safepoint | |
| 333 // | |
| 334 | |
| 335 void VM_ChangeBreakpoints::doit() { | |
| 336 switch (_operation) { | |
| 337 case SET_BREAKPOINT: | |
| 338 _breakpoints->set_at_safepoint(*_bp); | |
| 339 break; | |
| 340 case CLEAR_BREAKPOINT: | |
| 341 _breakpoints->clear_at_safepoint(*_bp); | |
| 342 break; | |
| 343 case CLEAR_ALL_BREAKPOINT: | |
| 344 _breakpoints->clearall_at_safepoint(); | |
| 345 break; | |
| 346 default: | |
| 347 assert(false, "Unknown operation"); | |
| 348 } | |
| 349 } | |
| 350 | |
| 351 void VM_ChangeBreakpoints::oops_do(OopClosure* f) { | |
| 352 // This operation keeps breakpoints alive | |
| 353 if (_breakpoints != NULL) { | |
| 354 _breakpoints->oops_do(f); | |
| 355 } | |
| 356 if (_bp != NULL) { | |
| 357 _bp->oops_do(f); | |
| 358 } | |
| 359 } | |
| 360 | |
| 361 // | |
| 362 // class JvmtiBreakpoints | |
| 363 // | |
| 364 // a JVMTI internal collection of JvmtiBreakpoint | |
| 365 // | |
| 366 | |
| 367 JvmtiBreakpoints::JvmtiBreakpoints(void listener_fun(void *,address *)) { | |
| 368 _bps.initialize(this,listener_fun); | |
| 369 } | |
| 370 | |
| 371 JvmtiBreakpoints:: ~JvmtiBreakpoints() {} | |
| 372 | |
| 373 void JvmtiBreakpoints::oops_do(OopClosure* f) { | |
| 374 _bps.oops_do(f); | |
| 375 } | |
| 376 | |
| 377 void JvmtiBreakpoints::gc_epilogue() { | |
| 378 _bps.gc_epilogue(); | |
| 379 } | |
| 380 | |
| 381 void JvmtiBreakpoints::print() { | |
| 382 #ifndef PRODUCT | |
| 383 ResourceMark rm; | |
| 384 | |
| 385 int n = _bps.length(); | |
| 386 for (int i=0; i<n; i++) { | |
| 387 JvmtiBreakpoint& bp = _bps.at(i); | |
| 388 tty->print("%d: ", i); | |
| 389 bp.print(); | |
| 390 tty->print_cr(""); | |
| 391 } | |
| 392 #endif | |
| 393 } | |
| 394 | |
| 395 | |
| 396 void JvmtiBreakpoints::set_at_safepoint(JvmtiBreakpoint& bp) { | |
| 397 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 398 | |
| 399 int i = _bps.find(bp); | |
| 400 if (i == -1) { | |
| 401 _bps.append(bp); | |
| 402 bp.set(); | |
| 403 } | |
| 404 } | |
| 405 | |
| 406 void JvmtiBreakpoints::clear_at_safepoint(JvmtiBreakpoint& bp) { | |
| 407 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 408 | |
| 409 int i = _bps.find(bp); | |
| 410 if (i != -1) { | |
| 411 _bps.remove(i); | |
| 412 bp.clear(); | |
| 413 } | |
| 414 } | |
| 415 | |
| 416 void JvmtiBreakpoints::clearall_at_safepoint() { | |
| 417 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 418 | |
| 419 int len = _bps.length(); | |
| 420 for (int i=0; i<len; i++) { | |
| 421 _bps.at(i).clear(); | |
| 422 } | |
| 423 _bps.clear(); | |
| 424 } | |
| 425 | |
| 426 int JvmtiBreakpoints::length() { return _bps.length(); } | |
| 427 | |
| 428 int JvmtiBreakpoints::set(JvmtiBreakpoint& bp) { | |
| 429 if ( _bps.find(bp) != -1) { | |
| 430 return JVMTI_ERROR_DUPLICATE; | |
| 431 } | |
| 432 VM_ChangeBreakpoints set_breakpoint(this,VM_ChangeBreakpoints::SET_BREAKPOINT, &bp); | |
| 433 VMThread::execute(&set_breakpoint); | |
| 434 return JVMTI_ERROR_NONE; | |
| 435 } | |
| 436 | |
| 437 int JvmtiBreakpoints::clear(JvmtiBreakpoint& bp) { | |
| 438 if ( _bps.find(bp) == -1) { | |
| 439 return JVMTI_ERROR_NOT_FOUND; | |
| 440 } | |
| 441 | |
| 442 VM_ChangeBreakpoints clear_breakpoint(this,VM_ChangeBreakpoints::CLEAR_BREAKPOINT, &bp); | |
| 443 VMThread::execute(&clear_breakpoint); | |
| 444 return JVMTI_ERROR_NONE; | |
| 445 } | |
| 446 | |
| 447 void JvmtiBreakpoints::clearall_in_class_at_safepoint(klassOop klass) { | |
| 448 bool changed = true; | |
| 449 // We are going to run thru the list of bkpts | |
| 450 // and delete some. This deletion probably alters | |
| 451 // the list in some implementation defined way such | |
| 452 // that when we delete entry i, the next entry might | |
| 453 // no longer be at i+1. To be safe, each time we delete | |
| 454 // an entry, we'll just start again from the beginning. | |
| 455 // We'll stop when we make a pass thru the whole list without | |
| 456 // deleting anything. | |
| 457 while (changed) { | |
| 458 int len = _bps.length(); | |
| 459 changed = false; | |
| 460 for (int i = 0; i < len; i++) { | |
| 461 JvmtiBreakpoint& bp = _bps.at(i); | |
| 462 if (bp.method()->method_holder() == klass) { | |
| 463 bp.clear(); | |
| 464 _bps.remove(i); | |
| 465 // This changed 'i' so we have to start over. | |
| 466 changed = true; | |
| 467 break; | |
| 468 } | |
| 469 } | |
| 470 } | |
| 471 } | |
| 472 | |
| 473 void JvmtiBreakpoints::clearall() { | |
| 474 VM_ChangeBreakpoints clearall_breakpoint(this,VM_ChangeBreakpoints::CLEAR_ALL_BREAKPOINT); | |
| 475 VMThread::execute(&clearall_breakpoint); | |
| 476 } | |
| 477 | |
| 478 // | |
| 479 // class JvmtiCurrentBreakpoints | |
| 480 // | |
| 481 | |
| 482 JvmtiBreakpoints *JvmtiCurrentBreakpoints::_jvmti_breakpoints = NULL; | |
| 483 address * JvmtiCurrentBreakpoints::_breakpoint_list = NULL; | |
| 484 | |
| 485 | |
| 486 JvmtiBreakpoints& JvmtiCurrentBreakpoints::get_jvmti_breakpoints() { | |
| 487 if (_jvmti_breakpoints != NULL) return (*_jvmti_breakpoints); | |
| 488 _jvmti_breakpoints = new JvmtiBreakpoints(listener_fun); | |
| 489 assert(_jvmti_breakpoints != NULL, "_jvmti_breakpoints != NULL"); | |
| 490 return (*_jvmti_breakpoints); | |
| 491 } | |
| 492 | |
| 493 void JvmtiCurrentBreakpoints::listener_fun(void *this_obj, address *cache) { | |
| 494 JvmtiBreakpoints *this_jvmti = (JvmtiBreakpoints *) this_obj; | |
| 495 assert(this_jvmti != NULL, "this_jvmti != NULL"); | |
| 496 | |
| 497 debug_only(int n = this_jvmti->length();); | |
| 498 assert(cache[n] == NULL, "cache must be NULL terminated"); | |
| 499 | |
| 500 set_breakpoint_list(cache); | |
| 501 } | |
| 502 | |
| 503 | |
| 504 void JvmtiCurrentBreakpoints::oops_do(OopClosure* f) { | |
| 505 if (_jvmti_breakpoints != NULL) { | |
| 506 _jvmti_breakpoints->oops_do(f); | |
| 507 } | |
| 508 } | |
| 509 | |
| 510 void JvmtiCurrentBreakpoints::gc_epilogue() { | |
| 511 if (_jvmti_breakpoints != NULL) { | |
| 512 _jvmti_breakpoints->gc_epilogue(); | |
| 513 } | |
| 514 } | |
| 515 | |
| 516 | |
| 517 /////////////////////////////////////////////////////////////// | |
| 518 // | |
| 519 // class VM_GetOrSetLocal | |
| 520 // | |
| 521 | |
| 522 // Constructor for non-object getter | |
| 523 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type) | |
| 524 : _thread(thread) | |
| 525 , _calling_thread(NULL) | |
| 526 , _depth(depth) | |
| 527 , _index(index) | |
| 528 , _type(type) | |
| 529 , _set(false) | |
| 530 , _jvf(NULL) | |
| 531 , _result(JVMTI_ERROR_NONE) | |
| 532 { | |
| 533 } | |
| 534 | |
| 535 // Constructor for object or non-object setter | |
| 536 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type, jvalue value) | |
| 537 : _thread(thread) | |
| 538 , _calling_thread(NULL) | |
| 539 , _depth(depth) | |
| 540 , _index(index) | |
| 541 , _type(type) | |
| 542 , _value(value) | |
| 543 , _set(true) | |
| 544 , _jvf(NULL) | |
| 545 , _result(JVMTI_ERROR_NONE) | |
| 546 { | |
| 547 } | |
| 548 | |
| 549 // Constructor for object getter | |
| 550 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, int index) | |
| 551 : _thread(thread) | |
| 552 , _calling_thread(calling_thread) | |
| 553 , _depth(depth) | |
| 554 , _index(index) | |
| 555 , _type(T_OBJECT) | |
| 556 , _set(false) | |
| 557 , _jvf(NULL) | |
| 558 , _result(JVMTI_ERROR_NONE) | |
| 559 { | |
| 560 } | |
| 561 | |
| 562 | |
| 563 vframe *VM_GetOrSetLocal::get_vframe() { | |
| 564 if (!_thread->has_last_Java_frame()) { | |
| 565 return NULL; | |
| 566 } | |
| 567 RegisterMap reg_map(_thread); | |
| 568 vframe *vf = _thread->last_java_vframe(®_map); | |
| 569 int d = 0; | |
| 570 while ((vf != NULL) && (d < _depth)) { | |
| 571 vf = vf->java_sender(); | |
| 572 d++; | |
| 573 } | |
| 574 return vf; | |
| 575 } | |
| 576 | |
| 577 javaVFrame *VM_GetOrSetLocal::get_java_vframe() { | |
| 578 vframe* vf = get_vframe(); | |
| 579 if (vf == NULL) { | |
| 580 _result = JVMTI_ERROR_NO_MORE_FRAMES; | |
| 581 return NULL; | |
| 582 } | |
| 583 javaVFrame *jvf = (javaVFrame*)vf; | |
| 584 | |
| 585 if (!vf->is_java_frame() || jvf->method()->is_native()) { | |
| 586 _result = JVMTI_ERROR_OPAQUE_FRAME; | |
| 587 return NULL; | |
| 588 } | |
| 589 return jvf; | |
| 590 } | |
| 591 | |
| 592 // Check that the klass is assignable to a type with the given signature. | |
| 593 // Another solution could be to use the function Klass::is_subtype_of(type). | |
| 594 // But the type class can be forced to load/initialize eagerly in such a case. | |
| 595 // This may cause unexpected consequences like CFLH or class-init JVMTI events. | |
| 596 // It is better to avoid such a behavior. | |
| 597 bool VM_GetOrSetLocal::is_assignable(const char* ty_sign, Klass* klass, Thread* thread) { | |
| 598 assert(ty_sign != NULL, "type signature must not be NULL"); | |
| 599 assert(thread != NULL, "thread must not be NULL"); | |
| 600 assert(klass != NULL, "klass must not be NULL"); | |
| 601 | |
| 602 int len = (int) strlen(ty_sign); | |
| 603 if (ty_sign[0] == 'L' && ty_sign[len-1] == ';') { // Need pure class/interface name | |
| 604 ty_sign++; | |
| 605 len -= 2; | |
| 606 } | |
| 607 symbolHandle ty_sym = oopFactory::new_symbol_handle(ty_sign, len, thread); | |
| 608 if (klass->name() == ty_sym()) { | |
| 609 return true; | |
| 610 } | |
| 611 // Compare primary supers | |
| 612 int super_depth = klass->super_depth(); | |
| 613 int idx; | |
| 614 for (idx = 0; idx < super_depth; idx++) { | |
| 615 if (Klass::cast(klass->primary_super_of_depth(idx))->name() == ty_sym()) { | |
| 616 return true; | |
| 617 } | |
| 618 } | |
| 619 // Compare secondary supers | |
| 620 objArrayOop sec_supers = klass->secondary_supers(); | |
| 621 for (idx = 0; idx < sec_supers->length(); idx++) { | |
| 622 if (Klass::cast((klassOop) sec_supers->obj_at(idx))->name() == ty_sym()) { | |
| 623 return true; | |
| 624 } | |
| 625 } | |
| 626 return false; | |
| 627 } | |
| 628 | |
| 629 // Checks error conditions: | |
| 630 // JVMTI_ERROR_INVALID_SLOT | |
| 631 // JVMTI_ERROR_TYPE_MISMATCH | |
| 632 // Returns: 'true' - everything is Ok, 'false' - error code | |
| 633 | |
| 634 bool VM_GetOrSetLocal::check_slot_type(javaVFrame* jvf) { | |
| 635 methodOop method_oop = jvf->method(); | |
| 636 if (!method_oop->has_localvariable_table()) { | |
| 637 // Just to check index boundaries | |
| 638 jint extra_slot = (_type == T_LONG || _type == T_DOUBLE) ? 1 : 0; | |
| 639 if (_index < 0 || _index + extra_slot >= method_oop->max_locals()) { | |
| 640 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 641 return false; | |
| 642 } | |
| 643 return true; | |
| 644 } | |
| 645 | |
| 646 jint num_entries = method_oop->localvariable_table_length(); | |
| 647 if (num_entries == 0) { | |
| 648 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 649 return false; // There are no slots | |
| 650 } | |
| 651 int signature_idx = -1; | |
| 652 int vf_bci = jvf->bci(); | |
| 653 LocalVariableTableElement* table = method_oop->localvariable_table_start(); | |
| 654 for (int i = 0; i < num_entries; i++) { | |
| 655 int start_bci = table[i].start_bci; | |
| 656 int end_bci = start_bci + table[i].length; | |
| 657 | |
| 658 // Here we assume that locations of LVT entries | |
| 659 // with the same slot number cannot be overlapped | |
| 660 if (_index == (jint) table[i].slot && start_bci <= vf_bci && vf_bci <= end_bci) { | |
| 661 signature_idx = (int) table[i].descriptor_cp_index; | |
| 662 break; | |
| 663 } | |
| 664 } | |
| 665 if (signature_idx == -1) { | |
| 666 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 667 return false; // Incorrect slot index | |
| 668 } | |
| 669 symbolOop sign_sym = method_oop->constants()->symbol_at(signature_idx); | |
| 670 const char* signature = (const char *) sign_sym->as_utf8(); | |
| 671 BasicType slot_type = char2type(signature[0]); | |
| 672 | |
| 673 switch (slot_type) { | |
| 674 case T_BYTE: | |
| 675 case T_SHORT: | |
| 676 case T_CHAR: | |
| 677 case T_BOOLEAN: | |
| 678 slot_type = T_INT; | |
| 679 break; | |
| 680 case T_ARRAY: | |
| 681 slot_type = T_OBJECT; | |
| 682 break; | |
| 683 }; | |
| 684 if (_type != slot_type) { | |
| 685 _result = JVMTI_ERROR_TYPE_MISMATCH; | |
| 686 return false; | |
| 687 } | |
| 688 | |
| 689 jobject jobj = _value.l; | |
| 690 if (_set && slot_type == T_OBJECT && jobj != NULL) { // NULL reference is allowed | |
| 691 // Check that the jobject class matches the return type signature. | |
| 692 JavaThread* cur_thread = JavaThread::current(); | |
| 693 HandleMark hm(cur_thread); | |
| 694 | |
| 695 Handle obj = Handle(cur_thread, JNIHandles::resolve_external_guard(jobj)); | |
| 696 NULL_CHECK(obj, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
| 697 KlassHandle ob_kh = KlassHandle(cur_thread, obj->klass()); | |
| 698 NULL_CHECK(ob_kh, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
| 699 | |
| 700 if (!is_assignable(signature, Klass::cast(ob_kh()), cur_thread)) { | |
| 701 _result = JVMTI_ERROR_TYPE_MISMATCH; | |
| 702 return false; | |
| 703 } | |
| 704 } | |
| 705 return true; | |
| 706 } | |
| 707 | |
| 708 static bool can_be_deoptimized(vframe* vf) { | |
| 709 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized()); | |
| 710 } | |
| 711 | |
| 712 bool VM_GetOrSetLocal::doit_prologue() { | |
| 713 _jvf = get_java_vframe(); | |
| 714 NULL_CHECK(_jvf, false); | |
| 715 | |
| 716 if (!check_slot_type(_jvf)) { | |
| 717 return false; | |
| 718 } | |
| 719 return true; | |
| 720 } | |
| 721 | |
| 722 void VM_GetOrSetLocal::doit() { | |
| 723 if (_set) { | |
| 724 // Force deoptimization of frame if compiled because it's | |
| 725 // possible the compiler emitted some locals as constant values, | |
| 726 // meaning they are not mutable. | |
| 727 if (can_be_deoptimized(_jvf)) { | |
| 728 | |
| 729 // Schedule deoptimization so that eventually the local | |
| 730 // update will be written to an interpreter frame. | |
|
1905
ce6848d0666d
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never
parents:
1552
diff
changeset
|
731 Deoptimization::deoptimize_frame(_jvf->thread(), _jvf->fr().id()); |
| 0 | 732 |
| 733 // Now store a new value for the local which will be applied | |
| 734 // once deoptimization occurs. Note however that while this | |
| 735 // write is deferred until deoptimization actually happens | |
| 736 // can vframe created after this point will have its locals | |
| 737 // reflecting this update so as far as anyone can see the | |
| 738 // write has already taken place. | |
| 739 | |
| 740 // If we are updating an oop then get the oop from the handle | |
| 741 // since the handle will be long gone by the time the deopt | |
| 742 // happens. The oop stored in the deferred local will be | |
| 743 // gc'd on its own. | |
| 744 if (_type == T_OBJECT) { | |
| 745 _value.l = (jobject) (JNIHandles::resolve_external_guard(_value.l)); | |
| 746 } | |
| 747 // Re-read the vframe so we can see that it is deoptimized | |
| 748 // [ Only need because of assert in update_local() ] | |
| 749 _jvf = get_java_vframe(); | |
| 750 ((compiledVFrame*)_jvf)->update_local(_type, _index, _value); | |
| 751 return; | |
| 752 } | |
| 753 StackValueCollection *locals = _jvf->locals(); | |
| 754 HandleMark hm; | |
| 755 | |
| 756 switch (_type) { | |
| 757 case T_INT: locals->set_int_at (_index, _value.i); break; | |
| 758 case T_LONG: locals->set_long_at (_index, _value.j); break; | |
| 759 case T_FLOAT: locals->set_float_at (_index, _value.f); break; | |
| 760 case T_DOUBLE: locals->set_double_at(_index, _value.d); break; | |
| 761 case T_OBJECT: { | |
| 762 Handle ob_h(JNIHandles::resolve_external_guard(_value.l)); | |
| 763 locals->set_obj_at (_index, ob_h); | |
| 764 break; | |
| 765 } | |
| 766 default: ShouldNotReachHere(); | |
| 767 } | |
| 768 _jvf->set_locals(locals); | |
| 769 } else { | |
| 770 StackValueCollection *locals = _jvf->locals(); | |
| 771 | |
| 772 if (locals->at(_index)->type() == T_CONFLICT) { | |
| 773 memset(&_value, 0, sizeof(_value)); | |
| 774 _value.l = NULL; | |
| 775 return; | |
| 776 } | |
| 777 | |
| 778 switch (_type) { | |
| 779 case T_INT: _value.i = locals->int_at (_index); break; | |
| 780 case T_LONG: _value.j = locals->long_at (_index); break; | |
| 781 case T_FLOAT: _value.f = locals->float_at (_index); break; | |
| 782 case T_DOUBLE: _value.d = locals->double_at(_index); break; | |
| 783 case T_OBJECT: { | |
| 784 // Wrap the oop to be returned in a local JNI handle since | |
| 785 // oops_do() no longer applies after doit() is finished. | |
| 786 oop obj = locals->obj_at(_index)(); | |
| 787 _value.l = JNIHandles::make_local(_calling_thread, obj); | |
| 788 break; | |
| 789 } | |
| 790 default: ShouldNotReachHere(); | |
| 791 } | |
| 792 } | |
| 793 } | |
| 794 | |
| 795 | |
| 796 bool VM_GetOrSetLocal::allow_nested_vm_operations() const { | |
| 797 return true; // May need to deoptimize | |
| 798 } | |
| 799 | |
| 800 | |
| 801 ///////////////////////////////////////////////////////////////////////////////////////// | |
| 802 | |
| 803 // | |
| 804 // class JvmtiSuspendControl - see comments in jvmtiImpl.hpp | |
| 805 // | |
| 806 | |
| 807 bool JvmtiSuspendControl::suspend(JavaThread *java_thread) { | |
| 808 // external suspend should have caught suspending a thread twice | |
| 809 | |
| 810 // Immediate suspension required for JPDA back-end so JVMTI agent threads do | |
| 811 // not deadlock due to later suspension on transitions while holding | |
| 812 // raw monitors. Passing true causes the immediate suspension. | |
| 813 // java_suspend() will catch threads in the process of exiting | |
| 814 // and will ignore them. | |
| 815 java_thread->java_suspend(); | |
| 816 | |
| 817 // It would be nice to have the following assertion in all the time, | |
| 818 // but it is possible for a racing resume request to have resumed | |
| 819 // this thread right after we suspended it. Temporarily enable this | |
| 820 // assertion if you are chasing a different kind of bug. | |
| 821 // | |
| 822 // assert(java_lang_Thread::thread(java_thread->threadObj()) == NULL || | |
| 823 // java_thread->is_being_ext_suspended(), "thread is not suspended"); | |
| 824 | |
| 825 if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) { | |
| 826 // check again because we can get delayed in java_suspend(): | |
| 827 // the thread is in process of exiting. | |
| 828 return false; | |
| 829 } | |
| 830 | |
| 831 return true; | |
| 832 } | |
| 833 | |
| 834 bool JvmtiSuspendControl::resume(JavaThread *java_thread) { | |
| 835 // external suspend should have caught resuming a thread twice | |
| 836 assert(java_thread->is_being_ext_suspended(), "thread should be suspended"); | |
| 837 | |
| 838 // resume thread | |
| 839 { | |
| 840 // must always grab Threads_lock, see JVM_SuspendThread | |
| 841 MutexLocker ml(Threads_lock); | |
| 842 java_thread->java_resume(); | |
| 843 } | |
| 844 | |
| 845 return true; | |
| 846 } | |
| 847 | |
| 848 | |
| 849 void JvmtiSuspendControl::print() { | |
| 850 #ifndef PRODUCT | |
| 851 MutexLocker mu(Threads_lock); | |
| 852 ResourceMark rm; | |
| 853 | |
| 854 tty->print("Suspended Threads: ["); | |
| 855 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
| 856 #if JVMTI_TRACE | |
| 857 const char *name = JvmtiTrace::safe_get_thread_name(thread); | |
| 858 #else | |
| 859 const char *name = ""; | |
| 860 #endif /*JVMTI_TRACE */ | |
| 861 tty->print("%s(%c ", name, thread->is_being_ext_suspended() ? 'S' : '_'); | |
| 862 if (!thread->has_last_Java_frame()) { | |
| 863 tty->print("no stack"); | |
| 864 } | |
| 865 tty->print(") "); | |
| 866 } | |
| 867 tty->print_cr("]"); | |
| 868 #endif | |
| 869 } |