Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiImpl.cpp @ 3744:60b8287df30e
7049415: Failure of resolution of sym.reference to the c.s.s. should be wrapped in BootstrapMethodError
Summary: Delegate invokedynamic linkage errors to MethodHandleNatives.raiseException.
Reviewed-by: never
| author | jrose |
|---|---|
| date | Wed, 01 Jun 2011 23:25:20 -0700 |
| parents | 0cddebc420d8 |
| children | f08d439fab8c |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/systemDictionary.hpp" | |
| 27 #include "interpreter/interpreter.hpp" | |
| 28 #include "jvmtifiles/jvmtiEnv.hpp" | |
| 29 #include "memory/resourceArea.hpp" | |
| 30 #include "oops/instanceKlass.hpp" | |
| 31 #include "prims/jvmtiAgentThread.hpp" | |
| 32 #include "prims/jvmtiEventController.inline.hpp" | |
| 33 #include "prims/jvmtiImpl.hpp" | |
| 34 #include "prims/jvmtiRedefineClasses.hpp" | |
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35 #include "runtime/atomic.hpp" |
| 1972 | 36 #include "runtime/deoptimization.hpp" |
| 37 #include "runtime/handles.hpp" | |
| 38 #include "runtime/handles.inline.hpp" | |
| 39 #include "runtime/interfaceSupport.hpp" | |
| 40 #include "runtime/javaCalls.hpp" | |
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41 #include "runtime/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 | |
| 0 | 57 |
| 58 // | |
| 59 // class JvmtiAgentThread | |
| 60 // | |
| 61 // JavaThread used to wrap a thread started by an agent | |
| 62 // using the JVMTI method RunAgentThread. | |
| 63 // | |
| 64 | |
| 65 JvmtiAgentThread::JvmtiAgentThread(JvmtiEnv* env, jvmtiStartFunction start_fn, const void *start_arg) | |
| 66 : JavaThread(start_function_wrapper) { | |
| 67 _env = env; | |
| 68 _start_fn = start_fn; | |
| 69 _start_arg = start_arg; | |
| 70 } | |
| 71 | |
| 72 void | |
| 73 JvmtiAgentThread::start_function_wrapper(JavaThread *thread, TRAPS) { | |
| 74 // It is expected that any Agent threads will be created as | |
| 75 // Java Threads. If this is the case, notification of the creation | |
| 76 // of the thread is given in JavaThread::thread_main(). | |
| 77 assert(thread->is_Java_thread(), "debugger thread should be a Java Thread"); | |
| 78 assert(thread == JavaThread::current(), "sanity check"); | |
| 79 | |
| 80 JvmtiAgentThread *dthread = (JvmtiAgentThread *)thread; | |
| 81 dthread->call_start_function(); | |
| 82 } | |
| 83 | |
| 84 void | |
| 85 JvmtiAgentThread::call_start_function() { | |
| 86 ThreadToNativeFromVM transition(this); | |
| 87 _start_fn(_env->jvmti_external(), jni_environment(), (void*)_start_arg); | |
| 88 } | |
| 89 | |
| 90 | |
| 91 // | |
| 92 // class GrowableCache - private methods | |
| 93 // | |
| 94 | |
| 95 void GrowableCache::recache() { | |
| 96 int len = _elements->length(); | |
| 97 | |
| 98 FREE_C_HEAP_ARRAY(address, _cache); | |
| 99 _cache = NEW_C_HEAP_ARRAY(address,len+1); | |
| 100 | |
| 101 for (int i=0; i<len; i++) { | |
| 102 _cache[i] = _elements->at(i)->getCacheValue(); | |
| 103 // | |
| 104 // The cache entry has gone bad. Without a valid frame pointer | |
| 105 // value, the entry is useless so we simply delete it in product | |
| 106 // mode. The call to remove() will rebuild the cache again | |
| 107 // without the bad entry. | |
| 108 // | |
| 109 if (_cache[i] == NULL) { | |
| 110 assert(false, "cannot recache NULL elements"); | |
| 111 remove(i); | |
| 112 return; | |
| 113 } | |
| 114 } | |
| 115 _cache[len] = NULL; | |
| 116 | |
| 117 _listener_fun(_this_obj,_cache); | |
| 118 } | |
| 119 | |
| 120 bool GrowableCache::equals(void* v, GrowableElement *e2) { | |
| 121 GrowableElement *e1 = (GrowableElement *) v; | |
| 122 assert(e1 != NULL, "e1 != NULL"); | |
| 123 assert(e2 != NULL, "e2 != NULL"); | |
| 124 | |
| 125 return e1->equals(e2); | |
| 126 } | |
| 127 | |
| 128 // | |
| 129 // class GrowableCache - public methods | |
| 130 // | |
| 131 | |
| 132 GrowableCache::GrowableCache() { | |
| 133 _this_obj = NULL; | |
| 134 _listener_fun = NULL; | |
| 135 _elements = NULL; | |
| 136 _cache = NULL; | |
| 137 } | |
| 138 | |
| 139 GrowableCache::~GrowableCache() { | |
| 140 clear(); | |
| 141 delete _elements; | |
| 142 FREE_C_HEAP_ARRAY(address, _cache); | |
| 143 } | |
| 144 | |
| 145 void GrowableCache::initialize(void *this_obj, void listener_fun(void *, address*) ) { | |
| 146 _this_obj = this_obj; | |
| 147 _listener_fun = listener_fun; | |
| 148 _elements = new (ResourceObj::C_HEAP) GrowableArray<GrowableElement*>(5,true); | |
| 149 recache(); | |
| 150 } | |
| 151 | |
| 152 // number of elements in the collection | |
| 153 int GrowableCache::length() { | |
| 154 return _elements->length(); | |
| 155 } | |
| 156 | |
| 157 // get the value of the index element in the collection | |
| 158 GrowableElement* GrowableCache::at(int index) { | |
| 159 GrowableElement *e = (GrowableElement *) _elements->at(index); | |
| 160 assert(e != NULL, "e != NULL"); | |
| 161 return e; | |
| 162 } | |
| 163 | |
| 164 int GrowableCache::find(GrowableElement* e) { | |
| 165 return _elements->find(e, GrowableCache::equals); | |
| 166 } | |
| 167 | |
| 168 // append a copy of the element to the end of the collection | |
| 169 void GrowableCache::append(GrowableElement* e) { | |
| 170 GrowableElement *new_e = e->clone(); | |
| 171 _elements->append(new_e); | |
| 172 recache(); | |
| 173 } | |
| 174 | |
| 175 // insert a copy of the element using lessthan() | |
| 176 void GrowableCache::insert(GrowableElement* e) { | |
| 177 GrowableElement *new_e = e->clone(); | |
| 178 _elements->append(new_e); | |
| 179 | |
| 180 int n = length()-2; | |
| 181 for (int i=n; i>=0; i--) { | |
| 182 GrowableElement *e1 = _elements->at(i); | |
| 183 GrowableElement *e2 = _elements->at(i+1); | |
| 184 if (e2->lessThan(e1)) { | |
| 185 _elements->at_put(i+1, e1); | |
| 186 _elements->at_put(i, e2); | |
| 187 } | |
| 188 } | |
| 189 | |
| 190 recache(); | |
| 191 } | |
| 192 | |
| 193 // remove the element at index | |
| 194 void GrowableCache::remove (int index) { | |
| 195 GrowableElement *e = _elements->at(index); | |
| 196 assert(e != NULL, "e != NULL"); | |
| 197 _elements->remove(e); | |
| 198 delete e; | |
| 199 recache(); | |
| 200 } | |
| 201 | |
| 202 // clear out all elements, release all heap space and | |
| 203 // let our listener know that things have changed. | |
| 204 void GrowableCache::clear() { | |
| 205 int len = _elements->length(); | |
| 206 for (int i=0; i<len; i++) { | |
| 207 delete _elements->at(i); | |
| 208 } | |
| 209 _elements->clear(); | |
| 210 recache(); | |
| 211 } | |
| 212 | |
| 213 void GrowableCache::oops_do(OopClosure* f) { | |
| 214 int len = _elements->length(); | |
| 215 for (int i=0; i<len; i++) { | |
| 216 GrowableElement *e = _elements->at(i); | |
| 217 e->oops_do(f); | |
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218 } |
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219 } |
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220 |
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221 void GrowableCache::gc_epilogue() { |
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222 int len = _elements->length(); |
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223 for (int i=0; i<len; i++) { |
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224 _cache[i] = _elements->at(i)->getCacheValue(); |
| 0 | 225 } |
| 226 } | |
| 227 | |
| 228 // | |
| 229 // class JvmtiBreakpoint | |
| 230 // | |
| 231 | |
| 232 JvmtiBreakpoint::JvmtiBreakpoint() { | |
| 233 _method = NULL; | |
| 234 _bci = 0; | |
| 235 #ifdef CHECK_UNHANDLED_OOPS | |
| 236 // This one is always allocated with new, but check it just in case. | |
| 237 Thread *thread = Thread::current(); | |
| 238 if (thread->is_in_stack((address)&_method)) { | |
| 239 thread->allow_unhandled_oop((oop*)&_method); | |
| 240 } | |
| 241 #endif // CHECK_UNHANDLED_OOPS | |
| 242 } | |
| 243 | |
| 244 JvmtiBreakpoint::JvmtiBreakpoint(methodOop m_method, jlocation location) { | |
| 245 _method = m_method; | |
| 246 assert(_method != NULL, "_method != NULL"); | |
| 247 _bci = (int) location; | |
| 248 #ifdef CHECK_UNHANDLED_OOPS | |
| 249 // Could be allocated with new and wouldn't be on the unhandled oop list. | |
| 250 Thread *thread = Thread::current(); | |
| 251 if (thread->is_in_stack((address)&_method)) { | |
| 252 thread->allow_unhandled_oop(&_method); | |
| 253 } | |
| 254 #endif // CHECK_UNHANDLED_OOPS | |
| 255 | |
| 256 assert(_bci >= 0, "_bci >= 0"); | |
| 257 } | |
| 258 | |
| 259 void JvmtiBreakpoint::copy(JvmtiBreakpoint& bp) { | |
| 260 _method = bp._method; | |
| 261 _bci = bp._bci; | |
| 262 } | |
| 263 | |
| 264 bool JvmtiBreakpoint::lessThan(JvmtiBreakpoint& bp) { | |
| 265 Unimplemented(); | |
| 266 return false; | |
| 267 } | |
| 268 | |
| 269 bool JvmtiBreakpoint::equals(JvmtiBreakpoint& bp) { | |
| 270 return _method == bp._method | |
| 271 && _bci == bp._bci; | |
| 272 } | |
| 273 | |
| 274 bool JvmtiBreakpoint::is_valid() { | |
| 275 return _method != NULL && | |
| 276 _bci >= 0; | |
| 277 } | |
| 278 | |
| 279 address JvmtiBreakpoint::getBcp() { | |
| 280 return _method->bcp_from(_bci); | |
| 281 } | |
| 282 | |
| 283 void JvmtiBreakpoint::each_method_version_do(method_action meth_act) { | |
| 284 ((methodOopDesc*)_method->*meth_act)(_bci); | |
| 285 | |
| 286 // add/remove breakpoint to/from versions of the method that | |
| 287 // are EMCP. Directly or transitively obsolete methods are | |
| 288 // not saved in the PreviousVersionInfo. | |
| 289 Thread *thread = Thread::current(); | |
| 290 instanceKlassHandle ikh = instanceKlassHandle(thread, _method->method_holder()); | |
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291 Symbol* m_name = _method->name(); |
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292 Symbol* m_signature = _method->signature(); |
| 0 | 293 |
| 294 { | |
| 295 ResourceMark rm(thread); | |
| 296 // PreviousVersionInfo objects returned via PreviousVersionWalker | |
| 297 // contain a GrowableArray of handles. We have to clean up the | |
| 298 // GrowableArray _after_ the PreviousVersionWalker destructor | |
| 299 // has destroyed the handles. | |
| 300 { | |
| 301 // search previous versions if they exist | |
| 302 PreviousVersionWalker pvw((instanceKlass *)ikh()->klass_part()); | |
| 303 for (PreviousVersionInfo * pv_info = pvw.next_previous_version(); | |
| 304 pv_info != NULL; pv_info = pvw.next_previous_version()) { | |
| 305 GrowableArray<methodHandle>* methods = | |
| 306 pv_info->prev_EMCP_method_handles(); | |
| 307 | |
| 308 if (methods == NULL) { | |
| 309 // We have run into a PreviousVersion generation where | |
| 310 // all methods were made obsolete during that generation's | |
| 311 // RedefineClasses() operation. At the time of that | |
| 312 // operation, all EMCP methods were flushed so we don't | |
| 313 // have to go back any further. | |
| 314 // | |
| 315 // A NULL methods array is different than an empty methods | |
| 316 // array. We cannot infer any optimizations about older | |
| 317 // generations from an empty methods array for the current | |
| 318 // generation. | |
| 319 break; | |
| 320 } | |
| 321 | |
| 322 for (int i = methods->length() - 1; i >= 0; i--) { | |
| 323 methodHandle method = methods->at(i); | |
| 324 if (method->name() == m_name && method->signature() == m_signature) { | |
| 325 RC_TRACE(0x00000800, ("%sing breakpoint in %s(%s)", | |
| 326 meth_act == &methodOopDesc::set_breakpoint ? "sett" : "clear", | |
| 327 method->name()->as_C_string(), | |
| 328 method->signature()->as_C_string())); | |
| 329 assert(!method->is_obsolete(), "only EMCP methods here"); | |
| 330 | |
| 331 ((methodOopDesc*)method()->*meth_act)(_bci); | |
| 332 break; | |
| 333 } | |
| 334 } | |
| 335 } | |
| 336 } // pvw is cleaned up | |
| 337 } // rm is cleaned up | |
| 338 } | |
| 339 | |
| 340 void JvmtiBreakpoint::set() { | |
| 341 each_method_version_do(&methodOopDesc::set_breakpoint); | |
| 342 } | |
| 343 | |
| 344 void JvmtiBreakpoint::clear() { | |
| 345 each_method_version_do(&methodOopDesc::clear_breakpoint); | |
| 346 } | |
| 347 | |
| 348 void JvmtiBreakpoint::print() { | |
| 349 #ifndef PRODUCT | |
| 350 const char *class_name = (_method == NULL) ? "NULL" : _method->klass_name()->as_C_string(); | |
| 351 const char *method_name = (_method == NULL) ? "NULL" : _method->name()->as_C_string(); | |
| 352 | |
| 353 tty->print("Breakpoint(%s,%s,%d,%p)",class_name, method_name, _bci, getBcp()); | |
| 354 #endif | |
| 355 } | |
| 356 | |
| 357 | |
| 358 // | |
| 359 // class VM_ChangeBreakpoints | |
| 360 // | |
| 361 // Modify the Breakpoints data structure at a safepoint | |
| 362 // | |
| 363 | |
| 364 void VM_ChangeBreakpoints::doit() { | |
| 365 switch (_operation) { | |
| 366 case SET_BREAKPOINT: | |
| 367 _breakpoints->set_at_safepoint(*_bp); | |
| 368 break; | |
| 369 case CLEAR_BREAKPOINT: | |
| 370 _breakpoints->clear_at_safepoint(*_bp); | |
| 371 break; | |
| 372 case CLEAR_ALL_BREAKPOINT: | |
| 373 _breakpoints->clearall_at_safepoint(); | |
| 374 break; | |
| 375 default: | |
| 376 assert(false, "Unknown operation"); | |
| 377 } | |
| 378 } | |
| 379 | |
| 380 void VM_ChangeBreakpoints::oops_do(OopClosure* f) { | |
| 381 // This operation keeps breakpoints alive | |
| 382 if (_breakpoints != NULL) { | |
| 383 _breakpoints->oops_do(f); | |
| 384 } | |
| 385 if (_bp != NULL) { | |
| 386 _bp->oops_do(f); | |
| 387 } | |
| 388 } | |
| 389 | |
| 390 // | |
| 391 // class JvmtiBreakpoints | |
| 392 // | |
| 393 // a JVMTI internal collection of JvmtiBreakpoint | |
| 394 // | |
| 395 | |
| 396 JvmtiBreakpoints::JvmtiBreakpoints(void listener_fun(void *,address *)) { | |
| 397 _bps.initialize(this,listener_fun); | |
| 398 } | |
| 399 | |
| 400 JvmtiBreakpoints:: ~JvmtiBreakpoints() {} | |
| 401 | |
| 402 void JvmtiBreakpoints::oops_do(OopClosure* f) { | |
| 403 _bps.oops_do(f); | |
| 404 } | |
| 405 | |
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406 void JvmtiBreakpoints::gc_epilogue() { |
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407 _bps.gc_epilogue(); |
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408 } |
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409 |
| 0 | 410 void JvmtiBreakpoints::print() { |
| 411 #ifndef PRODUCT | |
| 412 ResourceMark rm; | |
| 413 | |
| 414 int n = _bps.length(); | |
| 415 for (int i=0; i<n; i++) { | |
| 416 JvmtiBreakpoint& bp = _bps.at(i); | |
| 417 tty->print("%d: ", i); | |
| 418 bp.print(); | |
| 419 tty->print_cr(""); | |
| 420 } | |
| 421 #endif | |
| 422 } | |
| 423 | |
| 424 | |
| 425 void JvmtiBreakpoints::set_at_safepoint(JvmtiBreakpoint& bp) { | |
| 426 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 427 | |
| 428 int i = _bps.find(bp); | |
| 429 if (i == -1) { | |
| 430 _bps.append(bp); | |
| 431 bp.set(); | |
| 432 } | |
| 433 } | |
| 434 | |
| 435 void JvmtiBreakpoints::clear_at_safepoint(JvmtiBreakpoint& bp) { | |
| 436 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 437 | |
| 438 int i = _bps.find(bp); | |
| 439 if (i != -1) { | |
| 440 _bps.remove(i); | |
| 441 bp.clear(); | |
| 442 } | |
| 443 } | |
| 444 | |
| 445 void JvmtiBreakpoints::clearall_at_safepoint() { | |
| 446 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 447 | |
| 448 int len = _bps.length(); | |
| 449 for (int i=0; i<len; i++) { | |
| 450 _bps.at(i).clear(); | |
| 451 } | |
| 452 _bps.clear(); | |
| 453 } | |
| 454 | |
| 455 int JvmtiBreakpoints::length() { return _bps.length(); } | |
| 456 | |
| 457 int JvmtiBreakpoints::set(JvmtiBreakpoint& bp) { | |
| 458 if ( _bps.find(bp) != -1) { | |
| 459 return JVMTI_ERROR_DUPLICATE; | |
| 460 } | |
| 461 VM_ChangeBreakpoints set_breakpoint(this,VM_ChangeBreakpoints::SET_BREAKPOINT, &bp); | |
| 462 VMThread::execute(&set_breakpoint); | |
| 463 return JVMTI_ERROR_NONE; | |
| 464 } | |
| 465 | |
| 466 int JvmtiBreakpoints::clear(JvmtiBreakpoint& bp) { | |
| 467 if ( _bps.find(bp) == -1) { | |
| 468 return JVMTI_ERROR_NOT_FOUND; | |
| 469 } | |
| 470 | |
| 471 VM_ChangeBreakpoints clear_breakpoint(this,VM_ChangeBreakpoints::CLEAR_BREAKPOINT, &bp); | |
| 472 VMThread::execute(&clear_breakpoint); | |
| 473 return JVMTI_ERROR_NONE; | |
| 474 } | |
| 475 | |
| 476 void JvmtiBreakpoints::clearall_in_class_at_safepoint(klassOop klass) { | |
| 477 bool changed = true; | |
| 478 // We are going to run thru the list of bkpts | |
| 479 // and delete some. This deletion probably alters | |
| 480 // the list in some implementation defined way such | |
| 481 // that when we delete entry i, the next entry might | |
| 482 // no longer be at i+1. To be safe, each time we delete | |
| 483 // an entry, we'll just start again from the beginning. | |
| 484 // We'll stop when we make a pass thru the whole list without | |
| 485 // deleting anything. | |
| 486 while (changed) { | |
| 487 int len = _bps.length(); | |
| 488 changed = false; | |
| 489 for (int i = 0; i < len; i++) { | |
| 490 JvmtiBreakpoint& bp = _bps.at(i); | |
| 491 if (bp.method()->method_holder() == klass) { | |
| 492 bp.clear(); | |
| 493 _bps.remove(i); | |
| 494 // This changed 'i' so we have to start over. | |
| 495 changed = true; | |
| 496 break; | |
| 497 } | |
| 498 } | |
| 499 } | |
| 500 } | |
| 501 | |
| 502 void JvmtiBreakpoints::clearall() { | |
| 503 VM_ChangeBreakpoints clearall_breakpoint(this,VM_ChangeBreakpoints::CLEAR_ALL_BREAKPOINT); | |
| 504 VMThread::execute(&clearall_breakpoint); | |
| 505 } | |
| 506 | |
| 507 // | |
| 508 // class JvmtiCurrentBreakpoints | |
| 509 // | |
| 510 | |
| 511 JvmtiBreakpoints *JvmtiCurrentBreakpoints::_jvmti_breakpoints = NULL; | |
| 512 address * JvmtiCurrentBreakpoints::_breakpoint_list = NULL; | |
| 513 | |
| 514 | |
| 515 JvmtiBreakpoints& JvmtiCurrentBreakpoints::get_jvmti_breakpoints() { | |
| 516 if (_jvmti_breakpoints != NULL) return (*_jvmti_breakpoints); | |
| 517 _jvmti_breakpoints = new JvmtiBreakpoints(listener_fun); | |
| 518 assert(_jvmti_breakpoints != NULL, "_jvmti_breakpoints != NULL"); | |
| 519 return (*_jvmti_breakpoints); | |
| 520 } | |
| 521 | |
| 522 void JvmtiCurrentBreakpoints::listener_fun(void *this_obj, address *cache) { | |
| 523 JvmtiBreakpoints *this_jvmti = (JvmtiBreakpoints *) this_obj; | |
| 524 assert(this_jvmti != NULL, "this_jvmti != NULL"); | |
| 525 | |
| 526 debug_only(int n = this_jvmti->length();); | |
| 527 assert(cache[n] == NULL, "cache must be NULL terminated"); | |
| 528 | |
| 529 set_breakpoint_list(cache); | |
| 530 } | |
| 531 | |
| 532 | |
| 533 void JvmtiCurrentBreakpoints::oops_do(OopClosure* f) { | |
| 534 if (_jvmti_breakpoints != NULL) { | |
| 535 _jvmti_breakpoints->oops_do(f); | |
| 536 } | |
| 537 } | |
| 538 | |
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539 void JvmtiCurrentBreakpoints::gc_epilogue() { |
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540 if (_jvmti_breakpoints != NULL) { |
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541 _jvmti_breakpoints->gc_epilogue(); |
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542 } |
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543 } |
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544 |
| 0 | 545 /////////////////////////////////////////////////////////////// |
| 546 // | |
| 547 // class VM_GetOrSetLocal | |
| 548 // | |
| 549 | |
| 550 // Constructor for non-object getter | |
| 551 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type) | |
| 552 : _thread(thread) | |
| 553 , _calling_thread(NULL) | |
| 554 , _depth(depth) | |
| 555 , _index(index) | |
| 556 , _type(type) | |
| 557 , _set(false) | |
| 558 , _jvf(NULL) | |
| 559 , _result(JVMTI_ERROR_NONE) | |
| 560 { | |
| 561 } | |
| 562 | |
| 563 // Constructor for object or non-object setter | |
| 564 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type, jvalue value) | |
| 565 : _thread(thread) | |
| 566 , _calling_thread(NULL) | |
| 567 , _depth(depth) | |
| 568 , _index(index) | |
| 569 , _type(type) | |
| 570 , _value(value) | |
| 571 , _set(true) | |
| 572 , _jvf(NULL) | |
| 573 , _result(JVMTI_ERROR_NONE) | |
| 574 { | |
| 575 } | |
| 576 | |
| 577 // Constructor for object getter | |
| 578 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, int index) | |
| 579 : _thread(thread) | |
| 580 , _calling_thread(calling_thread) | |
| 581 , _depth(depth) | |
| 582 , _index(index) | |
| 583 , _type(T_OBJECT) | |
| 584 , _set(false) | |
| 585 , _jvf(NULL) | |
| 586 , _result(JVMTI_ERROR_NONE) | |
| 587 { | |
| 588 } | |
| 589 | |
| 590 vframe *VM_GetOrSetLocal::get_vframe() { | |
| 591 if (!_thread->has_last_Java_frame()) { | |
| 592 return NULL; | |
| 593 } | |
| 594 RegisterMap reg_map(_thread); | |
| 595 vframe *vf = _thread->last_java_vframe(®_map); | |
| 596 int d = 0; | |
| 597 while ((vf != NULL) && (d < _depth)) { | |
| 598 vf = vf->java_sender(); | |
| 599 d++; | |
| 600 } | |
| 601 return vf; | |
| 602 } | |
| 603 | |
| 604 javaVFrame *VM_GetOrSetLocal::get_java_vframe() { | |
| 605 vframe* vf = get_vframe(); | |
| 606 if (vf == NULL) { | |
| 607 _result = JVMTI_ERROR_NO_MORE_FRAMES; | |
| 608 return NULL; | |
| 609 } | |
| 610 javaVFrame *jvf = (javaVFrame*)vf; | |
| 611 | |
| 2019 | 612 if (!vf->is_java_frame()) { |
| 0 | 613 _result = JVMTI_ERROR_OPAQUE_FRAME; |
| 614 return NULL; | |
| 615 } | |
| 616 return jvf; | |
| 617 } | |
| 618 | |
| 619 // Check that the klass is assignable to a type with the given signature. | |
| 620 // Another solution could be to use the function Klass::is_subtype_of(type). | |
| 621 // But the type class can be forced to load/initialize eagerly in such a case. | |
| 622 // This may cause unexpected consequences like CFLH or class-init JVMTI events. | |
| 623 // It is better to avoid such a behavior. | |
| 624 bool VM_GetOrSetLocal::is_assignable(const char* ty_sign, Klass* klass, Thread* thread) { | |
| 625 assert(ty_sign != NULL, "type signature must not be NULL"); | |
| 626 assert(thread != NULL, "thread must not be NULL"); | |
| 627 assert(klass != NULL, "klass must not be NULL"); | |
| 628 | |
| 629 int len = (int) strlen(ty_sign); | |
| 630 if (ty_sign[0] == 'L' && ty_sign[len-1] == ';') { // Need pure class/interface name | |
| 631 ty_sign++; | |
| 632 len -= 2; | |
| 633 } | |
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634 TempNewSymbol ty_sym = SymbolTable::new_symbol(ty_sign, len, thread); |
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635 if (klass->name() == ty_sym) { |
| 0 | 636 return true; |
| 637 } | |
| 638 // Compare primary supers | |
| 639 int super_depth = klass->super_depth(); | |
| 640 int idx; | |
| 641 for (idx = 0; idx < super_depth; idx++) { | |
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642 if (Klass::cast(klass->primary_super_of_depth(idx))->name() == ty_sym) { |
| 0 | 643 return true; |
| 644 } | |
| 645 } | |
| 646 // Compare secondary supers | |
| 647 objArrayOop sec_supers = klass->secondary_supers(); | |
| 648 for (idx = 0; idx < sec_supers->length(); idx++) { | |
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649 if (Klass::cast((klassOop) sec_supers->obj_at(idx))->name() == ty_sym) { |
| 0 | 650 return true; |
| 651 } | |
| 652 } | |
| 653 return false; | |
| 654 } | |
| 655 | |
| 656 // Checks error conditions: | |
| 657 // JVMTI_ERROR_INVALID_SLOT | |
| 658 // JVMTI_ERROR_TYPE_MISMATCH | |
| 659 // Returns: 'true' - everything is Ok, 'false' - error code | |
| 660 | |
| 661 bool VM_GetOrSetLocal::check_slot_type(javaVFrame* jvf) { | |
| 662 methodOop method_oop = jvf->method(); | |
| 663 if (!method_oop->has_localvariable_table()) { | |
| 664 // Just to check index boundaries | |
| 665 jint extra_slot = (_type == T_LONG || _type == T_DOUBLE) ? 1 : 0; | |
| 666 if (_index < 0 || _index + extra_slot >= method_oop->max_locals()) { | |
| 667 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 668 return false; | |
| 669 } | |
| 670 return true; | |
| 671 } | |
| 672 | |
| 673 jint num_entries = method_oop->localvariable_table_length(); | |
| 674 if (num_entries == 0) { | |
| 675 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 676 return false; // There are no slots | |
| 677 } | |
| 678 int signature_idx = -1; | |
| 679 int vf_bci = jvf->bci(); | |
| 680 LocalVariableTableElement* table = method_oop->localvariable_table_start(); | |
| 681 for (int i = 0; i < num_entries; i++) { | |
| 682 int start_bci = table[i].start_bci; | |
| 683 int end_bci = start_bci + table[i].length; | |
| 684 | |
| 685 // Here we assume that locations of LVT entries | |
| 686 // with the same slot number cannot be overlapped | |
| 687 if (_index == (jint) table[i].slot && start_bci <= vf_bci && vf_bci <= end_bci) { | |
| 688 signature_idx = (int) table[i].descriptor_cp_index; | |
| 689 break; | |
| 690 } | |
| 691 } | |
| 692 if (signature_idx == -1) { | |
| 693 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 694 return false; // Incorrect slot index | |
| 695 } | |
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696 Symbol* sign_sym = method_oop->constants()->symbol_at(signature_idx); |
| 0 | 697 const char* signature = (const char *) sign_sym->as_utf8(); |
| 698 BasicType slot_type = char2type(signature[0]); | |
| 699 | |
| 700 switch (slot_type) { | |
| 701 case T_BYTE: | |
| 702 case T_SHORT: | |
| 703 case T_CHAR: | |
| 704 case T_BOOLEAN: | |
| 705 slot_type = T_INT; | |
| 706 break; | |
| 707 case T_ARRAY: | |
| 708 slot_type = T_OBJECT; | |
| 709 break; | |
| 710 }; | |
| 711 if (_type != slot_type) { | |
| 712 _result = JVMTI_ERROR_TYPE_MISMATCH; | |
| 713 return false; | |
| 714 } | |
| 715 | |
| 716 jobject jobj = _value.l; | |
| 717 if (_set && slot_type == T_OBJECT && jobj != NULL) { // NULL reference is allowed | |
| 718 // Check that the jobject class matches the return type signature. | |
| 719 JavaThread* cur_thread = JavaThread::current(); | |
| 720 HandleMark hm(cur_thread); | |
| 721 | |
| 722 Handle obj = Handle(cur_thread, JNIHandles::resolve_external_guard(jobj)); | |
| 723 NULL_CHECK(obj, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
| 724 KlassHandle ob_kh = KlassHandle(cur_thread, obj->klass()); | |
| 725 NULL_CHECK(ob_kh, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
| 726 | |
| 727 if (!is_assignable(signature, Klass::cast(ob_kh()), cur_thread)) { | |
| 728 _result = JVMTI_ERROR_TYPE_MISMATCH; | |
| 729 return false; | |
| 730 } | |
| 731 } | |
| 732 return true; | |
| 733 } | |
| 734 | |
| 735 static bool can_be_deoptimized(vframe* vf) { | |
| 736 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized()); | |
| 737 } | |
| 738 | |
| 739 bool VM_GetOrSetLocal::doit_prologue() { | |
| 740 _jvf = get_java_vframe(); | |
| 741 NULL_CHECK(_jvf, false); | |
| 742 | |
| 2019 | 743 if (_jvf->method()->is_native()) { |
| 744 if (getting_receiver() && !_jvf->method()->is_static()) { | |
| 745 return true; | |
| 746 } else { | |
| 747 _result = JVMTI_ERROR_OPAQUE_FRAME; | |
| 748 return false; | |
| 749 } | |
| 750 } | |
| 751 | |
| 0 | 752 if (!check_slot_type(_jvf)) { |
| 753 return false; | |
| 754 } | |
| 755 return true; | |
| 756 } | |
| 757 | |
| 758 void VM_GetOrSetLocal::doit() { | |
| 759 if (_set) { | |
| 760 // Force deoptimization of frame if compiled because it's | |
| 761 // possible the compiler emitted some locals as constant values, | |
| 762 // meaning they are not mutable. | |
| 763 if (can_be_deoptimized(_jvf)) { | |
| 764 | |
| 765 // Schedule deoptimization so that eventually the local | |
| 766 // update will be written to an interpreter frame. | |
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767 Deoptimization::deoptimize_frame(_jvf->thread(), _jvf->fr().id()); |
| 0 | 768 |
| 769 // Now store a new value for the local which will be applied | |
| 770 // once deoptimization occurs. Note however that while this | |
| 771 // write is deferred until deoptimization actually happens | |
| 772 // can vframe created after this point will have its locals | |
| 773 // reflecting this update so as far as anyone can see the | |
| 774 // write has already taken place. | |
| 775 | |
| 776 // If we are updating an oop then get the oop from the handle | |
| 777 // since the handle will be long gone by the time the deopt | |
| 778 // happens. The oop stored in the deferred local will be | |
| 779 // gc'd on its own. | |
| 780 if (_type == T_OBJECT) { | |
| 781 _value.l = (jobject) (JNIHandles::resolve_external_guard(_value.l)); | |
| 782 } | |
| 783 // Re-read the vframe so we can see that it is deoptimized | |
| 784 // [ Only need because of assert in update_local() ] | |
| 785 _jvf = get_java_vframe(); | |
| 786 ((compiledVFrame*)_jvf)->update_local(_type, _index, _value); | |
| 787 return; | |
| 788 } | |
| 789 StackValueCollection *locals = _jvf->locals(); | |
| 790 HandleMark hm; | |
| 791 | |
| 792 switch (_type) { | |
| 2019 | 793 case T_INT: locals->set_int_at (_index, _value.i); break; |
| 794 case T_LONG: locals->set_long_at (_index, _value.j); break; | |
| 795 case T_FLOAT: locals->set_float_at (_index, _value.f); break; | |
| 796 case T_DOUBLE: locals->set_double_at(_index, _value.d); break; | |
| 797 case T_OBJECT: { | |
| 798 Handle ob_h(JNIHandles::resolve_external_guard(_value.l)); | |
| 799 locals->set_obj_at (_index, ob_h); | |
| 800 break; | |
| 801 } | |
| 802 default: ShouldNotReachHere(); | |
| 0 | 803 } |
| 804 _jvf->set_locals(locals); | |
| 805 } else { | |
| 2019 | 806 if (_jvf->method()->is_native() && _jvf->is_compiled_frame()) { |
| 807 assert(getting_receiver(), "Can only get here when getting receiver"); | |
| 808 oop receiver = _jvf->fr().get_native_receiver(); | |
| 809 _value.l = JNIHandles::make_local(_calling_thread, receiver); | |
| 810 } else { | |
| 811 StackValueCollection *locals = _jvf->locals(); | |
| 0 | 812 |
| 2019 | 813 if (locals->at(_index)->type() == T_CONFLICT) { |
| 814 memset(&_value, 0, sizeof(_value)); | |
| 815 _value.l = NULL; | |
| 816 return; | |
| 817 } | |
| 0 | 818 |
| 2019 | 819 switch (_type) { |
| 820 case T_INT: _value.i = locals->int_at (_index); break; | |
| 821 case T_LONG: _value.j = locals->long_at (_index); break; | |
| 822 case T_FLOAT: _value.f = locals->float_at (_index); break; | |
| 823 case T_DOUBLE: _value.d = locals->double_at(_index); break; | |
| 824 case T_OBJECT: { | |
| 825 // Wrap the oop to be returned in a local JNI handle since | |
| 826 // oops_do() no longer applies after doit() is finished. | |
| 827 oop obj = locals->obj_at(_index)(); | |
| 828 _value.l = JNIHandles::make_local(_calling_thread, obj); | |
| 829 break; | |
| 830 } | |
| 831 default: ShouldNotReachHere(); | |
| 832 } | |
| 0 | 833 } |
| 834 } | |
| 835 } | |
| 836 | |
| 837 | |
| 838 bool VM_GetOrSetLocal::allow_nested_vm_operations() const { | |
| 839 return true; // May need to deoptimize | |
| 840 } | |
| 841 | |
| 842 | |
| 2019 | 843 VM_GetReceiver::VM_GetReceiver( |
| 844 JavaThread* thread, JavaThread* caller_thread, jint depth) | |
| 845 : VM_GetOrSetLocal(thread, caller_thread, depth, 0) {} | |
| 846 | |
| 0 | 847 ///////////////////////////////////////////////////////////////////////////////////////// |
| 848 | |
| 849 // | |
| 850 // class JvmtiSuspendControl - see comments in jvmtiImpl.hpp | |
| 851 // | |
| 852 | |
| 853 bool JvmtiSuspendControl::suspend(JavaThread *java_thread) { | |
| 854 // external suspend should have caught suspending a thread twice | |
| 855 | |
| 856 // Immediate suspension required for JPDA back-end so JVMTI agent threads do | |
| 857 // not deadlock due to later suspension on transitions while holding | |
| 858 // raw monitors. Passing true causes the immediate suspension. | |
| 859 // java_suspend() will catch threads in the process of exiting | |
| 860 // and will ignore them. | |
| 861 java_thread->java_suspend(); | |
| 862 | |
| 863 // It would be nice to have the following assertion in all the time, | |
| 864 // but it is possible for a racing resume request to have resumed | |
| 865 // this thread right after we suspended it. Temporarily enable this | |
| 866 // assertion if you are chasing a different kind of bug. | |
| 867 // | |
| 868 // assert(java_lang_Thread::thread(java_thread->threadObj()) == NULL || | |
| 869 // java_thread->is_being_ext_suspended(), "thread is not suspended"); | |
| 870 | |
| 871 if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) { | |
| 872 // check again because we can get delayed in java_suspend(): | |
| 873 // the thread is in process of exiting. | |
| 874 return false; | |
| 875 } | |
| 876 | |
| 877 return true; | |
| 878 } | |
| 879 | |
| 880 bool JvmtiSuspendControl::resume(JavaThread *java_thread) { | |
| 881 // external suspend should have caught resuming a thread twice | |
| 882 assert(java_thread->is_being_ext_suspended(), "thread should be suspended"); | |
| 883 | |
| 884 // resume thread | |
| 885 { | |
| 886 // must always grab Threads_lock, see JVM_SuspendThread | |
| 887 MutexLocker ml(Threads_lock); | |
| 888 java_thread->java_resume(); | |
| 889 } | |
| 890 | |
| 891 return true; | |
| 892 } | |
| 893 | |
| 894 | |
| 895 void JvmtiSuspendControl::print() { | |
| 896 #ifndef PRODUCT | |
| 897 MutexLocker mu(Threads_lock); | |
| 898 ResourceMark rm; | |
| 899 | |
| 900 tty->print("Suspended Threads: ["); | |
| 901 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
| 902 #if JVMTI_TRACE | |
| 903 const char *name = JvmtiTrace::safe_get_thread_name(thread); | |
| 904 #else | |
| 905 const char *name = ""; | |
| 906 #endif /*JVMTI_TRACE */ | |
| 907 tty->print("%s(%c ", name, thread->is_being_ext_suspended() ? 'S' : '_'); | |
| 908 if (!thread->has_last_Java_frame()) { | |
| 909 tty->print("no stack"); | |
| 910 } | |
| 911 tty->print(") "); | |
| 912 } | |
| 913 tty->print_cr("]"); | |
| 914 #endif | |
| 915 } | |
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916 |
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917 #ifndef KERNEL |
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918 |
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919 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_load_event( |
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920 nmethod* nm) { |
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921 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_LOAD); |
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922 event._event_data.compiled_method_load = nm; |
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923 // Keep the nmethod alive until the ServiceThread can process |
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924 // this deferred event. |
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925 nmethodLocker::lock_nmethod(nm); |
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926 return event; |
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927 } |
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928 |
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929 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_unload_event( |
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930 nmethod* nm, jmethodID id, const void* code) { |
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931 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_UNLOAD); |
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932 event._event_data.compiled_method_unload.nm = nm; |
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933 event._event_data.compiled_method_unload.method_id = id; |
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934 event._event_data.compiled_method_unload.code_begin = code; |
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935 // Keep the nmethod alive until the ServiceThread can process |
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936 // this deferred event. This will keep the memory for the |
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937 // generated code from being reused too early. We pass |
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938 // zombie_ok == true here so that our nmethod that was just |
|
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939 // made into a zombie can be locked. |
|
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940 nmethodLocker::lock_nmethod(nm, true /* zombie_ok */); |
|
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941 return event; |
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942 } |
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943 |
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944 JvmtiDeferredEvent JvmtiDeferredEvent::dynamic_code_generated_event( |
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945 const char* name, const void* code_begin, const void* code_end) { |
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946 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_DYNAMIC_CODE_GENERATED); |
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947 // Need to make a copy of the name since we don't know how long |
|
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948 // the event poster will keep it around after we enqueue the |
|
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949 // deferred event and return. strdup() failure is handled in |
|
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950 // the post() routine below. |
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951 event._event_data.dynamic_code_generated.name = os::strdup(name); |
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952 event._event_data.dynamic_code_generated.code_begin = code_begin; |
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953 event._event_data.dynamic_code_generated.code_end = code_end; |
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954 return event; |
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955 } |
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956 |
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957 void JvmtiDeferredEvent::post() { |
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958 assert(ServiceThread::is_service_thread(Thread::current()), |
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959 "Service thread must post enqueued events"); |
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960 switch(_type) { |
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961 case TYPE_COMPILED_METHOD_LOAD: { |
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962 nmethod* nm = _event_data.compiled_method_load; |
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963 JvmtiExport::post_compiled_method_load(nm); |
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964 // done with the deferred event so unlock the nmethod |
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965 nmethodLocker::unlock_nmethod(nm); |
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|
966 break; |
|
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967 } |
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968 case TYPE_COMPILED_METHOD_UNLOAD: { |
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969 nmethod* nm = _event_data.compiled_method_unload.nm; |
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970 JvmtiExport::post_compiled_method_unload( |
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971 _event_data.compiled_method_unload.method_id, |
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972 _event_data.compiled_method_unload.code_begin); |
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973 // done with the deferred event so unlock the nmethod |
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974 nmethodLocker::unlock_nmethod(nm); |
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975 break; |
|
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976 } |
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977 case TYPE_DYNAMIC_CODE_GENERATED: { |
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978 JvmtiExport::post_dynamic_code_generated_internal( |
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979 // if strdup failed give the event a default name |
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980 (_event_data.dynamic_code_generated.name == NULL) |
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981 ? "unknown_code" : _event_data.dynamic_code_generated.name, |
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982 _event_data.dynamic_code_generated.code_begin, |
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983 _event_data.dynamic_code_generated.code_end); |
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984 if (_event_data.dynamic_code_generated.name != NULL) { |
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|
985 // release our copy |
|
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986 os::free((void *)_event_data.dynamic_code_generated.name); |
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987 } |
|
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|
988 break; |
|
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|
989 } |
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990 default: |
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991 ShouldNotReachHere(); |
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992 } |
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|
993 } |
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|
994 |
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995 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_tail = NULL; |
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996 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_head = NULL; |
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|
997 |
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998 volatile JvmtiDeferredEventQueue::QueueNode* |
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999 JvmtiDeferredEventQueue::_pending_list = NULL; |
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|
1000 |
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1001 bool JvmtiDeferredEventQueue::has_events() { |
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1002 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1003 return _queue_head != NULL || _pending_list != NULL; |
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1004 } |
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|
1005 |
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1006 void JvmtiDeferredEventQueue::enqueue(const JvmtiDeferredEvent& event) { |
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1007 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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|
1008 |
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1009 process_pending_events(); |
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1010 |
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1011 // Events get added to the end of the queue (and are pulled off the front). |
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1012 QueueNode* node = new QueueNode(event); |
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1013 if (_queue_tail == NULL) { |
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1014 _queue_tail = _queue_head = node; |
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1015 } else { |
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1016 assert(_queue_tail->next() == NULL, "Must be the last element in the list"); |
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1017 _queue_tail->set_next(node); |
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1018 _queue_tail = node; |
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|
1019 } |
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|
1020 |
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1021 Service_lock->notify_all(); |
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1022 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1023 "Inconsistent queue markers"); |
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1024 } |
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|
1025 |
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1026 JvmtiDeferredEvent JvmtiDeferredEventQueue::dequeue() { |
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1027 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1028 |
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1029 process_pending_events(); |
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1030 |
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1031 assert(_queue_head != NULL, "Nothing to dequeue"); |
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1032 |
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1033 if (_queue_head == NULL) { |
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1034 // Just in case this happens in product; it shouldn't but let's not crash |
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1035 return JvmtiDeferredEvent(); |
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1036 } |
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1037 |
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1038 QueueNode* node = _queue_head; |
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1039 _queue_head = _queue_head->next(); |
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1040 if (_queue_head == NULL) { |
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1041 _queue_tail = NULL; |
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1042 } |
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1043 |
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1044 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1045 "Inconsistent queue markers"); |
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1046 |
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1047 JvmtiDeferredEvent event = node->event(); |
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1048 delete node; |
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1049 return event; |
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1050 } |
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1051 |
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1052 void JvmtiDeferredEventQueue::add_pending_event( |
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1053 const JvmtiDeferredEvent& event) { |
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1054 |
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1055 QueueNode* node = new QueueNode(event); |
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1056 |
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1057 bool success = false; |
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1058 QueueNode* prev_value = (QueueNode*)_pending_list; |
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1059 do { |
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1060 node->set_next(prev_value); |
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1061 prev_value = (QueueNode*)Atomic::cmpxchg_ptr( |
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1062 (void*)node, (volatile void*)&_pending_list, (void*)node->next()); |
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1063 } while (prev_value != node->next()); |
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1064 } |
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1065 |
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1066 // This method transfers any events that were added by someone NOT holding |
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1067 // the lock into the mainline queue. |
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1068 void JvmtiDeferredEventQueue::process_pending_events() { |
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1069 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1070 |
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1071 if (_pending_list != NULL) { |
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1072 QueueNode* head = |
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1073 (QueueNode*)Atomic::xchg_ptr(NULL, (volatile void*)&_pending_list); |
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1074 |
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1075 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1076 "Inconsistent queue markers"); |
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1077 |
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1078 if (head != NULL) { |
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1079 // Since we've treated the pending list as a stack (with newer |
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1080 // events at the beginning), we need to join the bottom of the stack |
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1081 // with the 'tail' of the queue in order to get the events in the |
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1082 // right order. We do this by reversing the pending list and appending |
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1083 // it to the queue. |
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1084 |
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1085 QueueNode* new_tail = head; |
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1086 QueueNode* new_head = NULL; |
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1087 |
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1088 // This reverses the list |
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1089 QueueNode* prev = new_tail; |
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1090 QueueNode* node = new_tail->next(); |
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1091 new_tail->set_next(NULL); |
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1092 while (node != NULL) { |
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1093 QueueNode* next = node->next(); |
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1094 node->set_next(prev); |
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1095 prev = node; |
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1096 node = next; |
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1097 } |
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1098 new_head = prev; |
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1099 |
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1100 // Now append the new list to the queue |
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1101 if (_queue_tail != NULL) { |
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1102 _queue_tail->set_next(new_head); |
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1103 } else { // _queue_head == NULL |
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1104 _queue_head = new_head; |
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1105 } |
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1106 _queue_tail = new_tail; |
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1107 } |
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1108 } |
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1109 } |
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1110 |
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1111 #endif // ndef KERNEL |