Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiImpl.cpp @ 10405:f2110083203d
8005849: JEP 167: Event-Based JVM Tracing
Reviewed-by: acorn, coleenp, sla
Contributed-by: Karen Kinnear <karen.kinnear@oracle.com>, Bengt Rutisson <bengt.rutisson@oracle.com>, Calvin Cheung <calvin.cheung@oracle.com>, Erik Gahlin <erik.gahlin@oracle.com>, Erik Helin <erik.helin@oracle.com>, Jesper Wilhelmsson <jesper.wilhelmsson@oracle.com>, Keith McGuigan <keith.mcguigan@oracle.com>, Mattias Tobiasson <mattias.tobiasson@oracle.com>, Markus Gronlund <markus.gronlund@oracle.com>, Mikael Auno <mikael.auno@oracle.com>, Nils Eliasson <nils.eliasson@oracle.com>, Nils Loodin <nils.loodin@oracle.com>, Rickard Backman <rickard.backman@oracle.com>, Staffan Larsen <staffan.larsen@oracle.com>, Stefan Karlsson <stefan.karlsson@oracle.com>, Yekaterina Kantserova <yekaterina.kantserova@oracle.com>
| author | sla |
|---|---|
| date | Mon, 10 Jun 2013 11:30:51 +0200 |
| parents | 47bc9800972c |
| children | 836a62f43af9 4f9a42c33738 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 7951 | 2 * Copyright (c) 2003, 2013, 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" |
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44 #include "runtime/thread.inline.hpp" |
| 1972 | 45 #include "runtime/vframe.hpp" |
| 46 #include "runtime/vframe_hp.hpp" | |
| 47 #include "runtime/vm_operations.hpp" | |
| 48 #include "utilities/exceptions.hpp" | |
| 0 | 49 |
| 50 // | |
| 51 // class JvmtiAgentThread | |
| 52 // | |
| 53 // JavaThread used to wrap a thread started by an agent | |
| 54 // using the JVMTI method RunAgentThread. | |
| 55 // | |
| 56 | |
| 57 JvmtiAgentThread::JvmtiAgentThread(JvmtiEnv* env, jvmtiStartFunction start_fn, const void *start_arg) | |
| 58 : JavaThread(start_function_wrapper) { | |
| 59 _env = env; | |
| 60 _start_fn = start_fn; | |
| 61 _start_arg = start_arg; | |
| 62 } | |
| 63 | |
| 64 void | |
| 65 JvmtiAgentThread::start_function_wrapper(JavaThread *thread, TRAPS) { | |
| 66 // It is expected that any Agent threads will be created as | |
| 67 // Java Threads. If this is the case, notification of the creation | |
| 68 // of the thread is given in JavaThread::thread_main(). | |
| 69 assert(thread->is_Java_thread(), "debugger thread should be a Java Thread"); | |
| 70 assert(thread == JavaThread::current(), "sanity check"); | |
| 71 | |
| 72 JvmtiAgentThread *dthread = (JvmtiAgentThread *)thread; | |
| 73 dthread->call_start_function(); | |
| 74 } | |
| 75 | |
| 76 void | |
| 77 JvmtiAgentThread::call_start_function() { | |
| 78 ThreadToNativeFromVM transition(this); | |
| 79 _start_fn(_env->jvmti_external(), jni_environment(), (void*)_start_arg); | |
| 80 } | |
| 81 | |
| 82 | |
| 83 // | |
| 84 // class GrowableCache - private methods | |
| 85 // | |
| 86 | |
| 87 void GrowableCache::recache() { | |
| 88 int len = _elements->length(); | |
| 89 | |
| 6197 | 90 FREE_C_HEAP_ARRAY(address, _cache, mtInternal); |
| 91 _cache = NEW_C_HEAP_ARRAY(address,len+1, mtInternal); | |
| 0 | 92 |
| 93 for (int i=0; i<len; i++) { | |
| 94 _cache[i] = _elements->at(i)->getCacheValue(); | |
| 95 // | |
| 96 // The cache entry has gone bad. Without a valid frame pointer | |
| 97 // value, the entry is useless so we simply delete it in product | |
| 98 // mode. The call to remove() will rebuild the cache again | |
| 99 // without the bad entry. | |
| 100 // | |
| 101 if (_cache[i] == NULL) { | |
| 102 assert(false, "cannot recache NULL elements"); | |
| 103 remove(i); | |
| 104 return; | |
| 105 } | |
| 106 } | |
| 107 _cache[len] = NULL; | |
| 108 | |
| 109 _listener_fun(_this_obj,_cache); | |
| 110 } | |
| 111 | |
| 112 bool GrowableCache::equals(void* v, GrowableElement *e2) { | |
| 113 GrowableElement *e1 = (GrowableElement *) v; | |
| 114 assert(e1 != NULL, "e1 != NULL"); | |
| 115 assert(e2 != NULL, "e2 != NULL"); | |
| 116 | |
| 117 return e1->equals(e2); | |
| 118 } | |
| 119 | |
| 120 // | |
| 121 // class GrowableCache - public methods | |
| 122 // | |
| 123 | |
| 124 GrowableCache::GrowableCache() { | |
| 125 _this_obj = NULL; | |
| 126 _listener_fun = NULL; | |
| 127 _elements = NULL; | |
| 128 _cache = NULL; | |
| 129 } | |
| 130 | |
| 131 GrowableCache::~GrowableCache() { | |
| 132 clear(); | |
| 133 delete _elements; | |
| 6197 | 134 FREE_C_HEAP_ARRAY(address, _cache, mtInternal); |
| 0 | 135 } |
| 136 | |
| 137 void GrowableCache::initialize(void *this_obj, void listener_fun(void *, address*) ) { | |
| 138 _this_obj = this_obj; | |
| 139 _listener_fun = listener_fun; | |
| 6197 | 140 _elements = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<GrowableElement*>(5,true); |
| 0 | 141 recache(); |
| 142 } | |
| 143 | |
| 144 // number of elements in the collection | |
| 145 int GrowableCache::length() { | |
| 146 return _elements->length(); | |
| 147 } | |
| 148 | |
| 149 // get the value of the index element in the collection | |
| 150 GrowableElement* GrowableCache::at(int index) { | |
| 151 GrowableElement *e = (GrowableElement *) _elements->at(index); | |
| 152 assert(e != NULL, "e != NULL"); | |
| 153 return e; | |
| 154 } | |
| 155 | |
| 156 int GrowableCache::find(GrowableElement* e) { | |
| 157 return _elements->find(e, GrowableCache::equals); | |
| 158 } | |
| 159 | |
| 160 // append a copy of the element to the end of the collection | |
| 161 void GrowableCache::append(GrowableElement* e) { | |
| 162 GrowableElement *new_e = e->clone(); | |
| 163 _elements->append(new_e); | |
| 164 recache(); | |
| 165 } | |
| 166 | |
| 167 // insert a copy of the element using lessthan() | |
| 168 void GrowableCache::insert(GrowableElement* e) { | |
| 169 GrowableElement *new_e = e->clone(); | |
| 170 _elements->append(new_e); | |
| 171 | |
| 172 int n = length()-2; | |
| 173 for (int i=n; i>=0; i--) { | |
| 174 GrowableElement *e1 = _elements->at(i); | |
| 175 GrowableElement *e2 = _elements->at(i+1); | |
| 176 if (e2->lessThan(e1)) { | |
| 177 _elements->at_put(i+1, e1); | |
| 178 _elements->at_put(i, e2); | |
| 179 } | |
| 180 } | |
| 181 | |
| 182 recache(); | |
| 183 } | |
| 184 | |
| 185 // remove the element at index | |
| 186 void GrowableCache::remove (int index) { | |
| 187 GrowableElement *e = _elements->at(index); | |
| 188 assert(e != NULL, "e != NULL"); | |
| 189 _elements->remove(e); | |
| 190 delete e; | |
| 191 recache(); | |
| 192 } | |
| 193 | |
| 194 // clear out all elements, release all heap space and | |
| 195 // let our listener know that things have changed. | |
| 196 void GrowableCache::clear() { | |
| 197 int len = _elements->length(); | |
| 198 for (int i=0; i<len; i++) { | |
| 199 delete _elements->at(i); | |
| 200 } | |
| 201 _elements->clear(); | |
| 202 recache(); | |
| 203 } | |
| 204 | |
| 205 void GrowableCache::oops_do(OopClosure* f) { | |
| 206 int len = _elements->length(); | |
| 207 for (int i=0; i<len; i++) { | |
| 208 GrowableElement *e = _elements->at(i); | |
| 209 e->oops_do(f); | |
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210 } |
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211 } |
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212 |
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213 void GrowableCache::gc_epilogue() { |
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214 int len = _elements->length(); |
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215 for (int i=0; i<len; i++) { |
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216 _cache[i] = _elements->at(i)->getCacheValue(); |
| 0 | 217 } |
| 218 } | |
| 219 | |
| 220 // | |
| 221 // class JvmtiBreakpoint | |
| 222 // | |
| 223 | |
| 224 JvmtiBreakpoint::JvmtiBreakpoint() { | |
| 225 _method = NULL; | |
| 226 _bci = 0; | |
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227 _class_loader = NULL; |
| 0 | 228 #ifdef CHECK_UNHANDLED_OOPS |
| 229 // This one is always allocated with new, but check it just in case. | |
| 230 Thread *thread = Thread::current(); | |
| 231 if (thread->is_in_stack((address)&_method)) { | |
| 232 thread->allow_unhandled_oop((oop*)&_method); | |
| 233 } | |
| 234 #endif // CHECK_UNHANDLED_OOPS | |
| 235 } | |
| 236 | |
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237 JvmtiBreakpoint::JvmtiBreakpoint(Method* m_method, jlocation location) { |
| 0 | 238 _method = m_method; |
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239 _class_loader = _method->method_holder()->class_loader_data()->class_loader(); |
| 0 | 240 assert(_method != NULL, "_method != NULL"); |
| 241 _bci = (int) location; | |
| 242 assert(_bci >= 0, "_bci >= 0"); | |
| 243 } | |
| 244 | |
| 245 void JvmtiBreakpoint::copy(JvmtiBreakpoint& bp) { | |
| 246 _method = bp._method; | |
| 247 _bci = bp._bci; | |
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248 _class_loader = bp._class_loader; |
| 0 | 249 } |
| 250 | |
| 251 bool JvmtiBreakpoint::lessThan(JvmtiBreakpoint& bp) { | |
| 252 Unimplemented(); | |
| 253 return false; | |
| 254 } | |
| 255 | |
| 256 bool JvmtiBreakpoint::equals(JvmtiBreakpoint& bp) { | |
| 257 return _method == bp._method | |
| 258 && _bci == bp._bci; | |
| 259 } | |
| 260 | |
| 261 bool JvmtiBreakpoint::is_valid() { | |
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262 // class loader can be NULL |
| 0 | 263 return _method != NULL && |
| 264 _bci >= 0; | |
| 265 } | |
| 266 | |
| 267 address JvmtiBreakpoint::getBcp() { | |
| 268 return _method->bcp_from(_bci); | |
| 269 } | |
| 270 | |
| 271 void JvmtiBreakpoint::each_method_version_do(method_action meth_act) { | |
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272 ((Method*)_method->*meth_act)(_bci); |
| 0 | 273 |
| 274 // add/remove breakpoint to/from versions of the method that | |
| 275 // are EMCP. Directly or transitively obsolete methods are | |
| 276 // not saved in the PreviousVersionInfo. | |
| 277 Thread *thread = Thread::current(); | |
| 278 instanceKlassHandle ikh = instanceKlassHandle(thread, _method->method_holder()); | |
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279 Symbol* m_name = _method->name(); |
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280 Symbol* m_signature = _method->signature(); |
| 0 | 281 |
| 282 { | |
| 283 ResourceMark rm(thread); | |
| 284 // PreviousVersionInfo objects returned via PreviousVersionWalker | |
| 285 // contain a GrowableArray of handles. We have to clean up the | |
| 286 // GrowableArray _after_ the PreviousVersionWalker destructor | |
| 287 // has destroyed the handles. | |
| 288 { | |
| 289 // search previous versions if they exist | |
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290 PreviousVersionWalker pvw((InstanceKlass *)ikh()); |
| 0 | 291 for (PreviousVersionInfo * pv_info = pvw.next_previous_version(); |
| 292 pv_info != NULL; pv_info = pvw.next_previous_version()) { | |
| 293 GrowableArray<methodHandle>* methods = | |
| 294 pv_info->prev_EMCP_method_handles(); | |
| 295 | |
| 296 if (methods == NULL) { | |
| 297 // We have run into a PreviousVersion generation where | |
| 298 // all methods were made obsolete during that generation's | |
| 299 // RedefineClasses() operation. At the time of that | |
| 300 // operation, all EMCP methods were flushed so we don't | |
| 301 // have to go back any further. | |
| 302 // | |
| 303 // A NULL methods array is different than an empty methods | |
| 304 // array. We cannot infer any optimizations about older | |
| 305 // generations from an empty methods array for the current | |
| 306 // generation. | |
| 307 break; | |
| 308 } | |
| 309 | |
| 310 for (int i = methods->length() - 1; i >= 0; i--) { | |
| 311 methodHandle method = methods->at(i); | |
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312 // obsolete methods that are running are not deleted from |
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313 // previous version array, but they are skipped here. |
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314 if (!method->is_obsolete() && |
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315 method->name() == m_name && |
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316 method->signature() == m_signature) { |
| 0 | 317 RC_TRACE(0x00000800, ("%sing breakpoint in %s(%s)", |
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318 meth_act == &Method::set_breakpoint ? "sett" : "clear", |
| 0 | 319 method->name()->as_C_string(), |
| 320 method->signature()->as_C_string())); | |
| 321 | |
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322 ((Method*)method()->*meth_act)(_bci); |
| 0 | 323 break; |
| 324 } | |
| 325 } | |
| 326 } | |
| 327 } // pvw is cleaned up | |
| 328 } // rm is cleaned up | |
| 329 } | |
| 330 | |
| 331 void JvmtiBreakpoint::set() { | |
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332 each_method_version_do(&Method::set_breakpoint); |
| 0 | 333 } |
| 334 | |
| 335 void JvmtiBreakpoint::clear() { | |
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336 each_method_version_do(&Method::clear_breakpoint); |
| 0 | 337 } |
| 338 | |
| 339 void JvmtiBreakpoint::print() { | |
| 340 #ifndef PRODUCT | |
| 341 const char *class_name = (_method == NULL) ? "NULL" : _method->klass_name()->as_C_string(); | |
| 342 const char *method_name = (_method == NULL) ? "NULL" : _method->name()->as_C_string(); | |
| 343 | |
| 344 tty->print("Breakpoint(%s,%s,%d,%p)",class_name, method_name, _bci, getBcp()); | |
| 345 #endif | |
| 346 } | |
| 347 | |
| 348 | |
| 349 // | |
| 350 // class VM_ChangeBreakpoints | |
| 351 // | |
| 352 // Modify the Breakpoints data structure at a safepoint | |
| 353 // | |
| 354 | |
| 355 void VM_ChangeBreakpoints::doit() { | |
| 356 switch (_operation) { | |
| 357 case SET_BREAKPOINT: | |
| 358 _breakpoints->set_at_safepoint(*_bp); | |
| 359 break; | |
| 360 case CLEAR_BREAKPOINT: | |
| 361 _breakpoints->clear_at_safepoint(*_bp); | |
| 362 break; | |
| 363 default: | |
| 364 assert(false, "Unknown operation"); | |
| 365 } | |
| 366 } | |
| 367 | |
| 368 void VM_ChangeBreakpoints::oops_do(OopClosure* f) { | |
| 10405 | 369 // The JvmtiBreakpoints in _breakpoints will be visited via |
| 370 // JvmtiExport::oops_do. | |
| 0 | 371 if (_bp != NULL) { |
| 372 _bp->oops_do(f); | |
| 373 } | |
| 374 } | |
| 375 | |
| 376 // | |
| 377 // class JvmtiBreakpoints | |
| 378 // | |
| 379 // a JVMTI internal collection of JvmtiBreakpoint | |
| 380 // | |
| 381 | |
| 382 JvmtiBreakpoints::JvmtiBreakpoints(void listener_fun(void *,address *)) { | |
| 383 _bps.initialize(this,listener_fun); | |
| 384 } | |
| 385 | |
| 386 JvmtiBreakpoints:: ~JvmtiBreakpoints() {} | |
| 387 | |
| 388 void JvmtiBreakpoints::oops_do(OopClosure* f) { | |
| 389 _bps.oops_do(f); | |
| 390 } | |
| 391 | |
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392 void JvmtiBreakpoints::gc_epilogue() { |
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393 _bps.gc_epilogue(); |
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394 } |
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395 |
| 0 | 396 void JvmtiBreakpoints::print() { |
| 397 #ifndef PRODUCT | |
| 398 ResourceMark rm; | |
| 399 | |
| 400 int n = _bps.length(); | |
| 401 for (int i=0; i<n; i++) { | |
| 402 JvmtiBreakpoint& bp = _bps.at(i); | |
| 403 tty->print("%d: ", i); | |
| 404 bp.print(); | |
| 405 tty->print_cr(""); | |
| 406 } | |
| 407 #endif | |
| 408 } | |
| 409 | |
| 410 | |
| 411 void JvmtiBreakpoints::set_at_safepoint(JvmtiBreakpoint& bp) { | |
| 412 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 413 | |
| 414 int i = _bps.find(bp); | |
| 415 if (i == -1) { | |
| 416 _bps.append(bp); | |
| 417 bp.set(); | |
| 418 } | |
| 419 } | |
| 420 | |
| 421 void JvmtiBreakpoints::clear_at_safepoint(JvmtiBreakpoint& bp) { | |
| 422 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 423 | |
| 424 int i = _bps.find(bp); | |
| 425 if (i != -1) { | |
| 426 _bps.remove(i); | |
| 427 bp.clear(); | |
| 428 } | |
| 429 } | |
| 430 | |
| 431 int JvmtiBreakpoints::length() { return _bps.length(); } | |
| 432 | |
| 433 int JvmtiBreakpoints::set(JvmtiBreakpoint& bp) { | |
| 434 if ( _bps.find(bp) != -1) { | |
| 435 return JVMTI_ERROR_DUPLICATE; | |
| 436 } | |
| 10405 | 437 VM_ChangeBreakpoints set_breakpoint(VM_ChangeBreakpoints::SET_BREAKPOINT, &bp); |
| 0 | 438 VMThread::execute(&set_breakpoint); |
| 439 return JVMTI_ERROR_NONE; | |
| 440 } | |
| 441 | |
| 442 int JvmtiBreakpoints::clear(JvmtiBreakpoint& bp) { | |
| 443 if ( _bps.find(bp) == -1) { | |
| 444 return JVMTI_ERROR_NOT_FOUND; | |
| 445 } | |
| 446 | |
| 10405 | 447 VM_ChangeBreakpoints clear_breakpoint(VM_ChangeBreakpoints::CLEAR_BREAKPOINT, &bp); |
| 0 | 448 VMThread::execute(&clear_breakpoint); |
| 449 return JVMTI_ERROR_NONE; | |
| 450 } | |
| 451 | |
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452 void JvmtiBreakpoints::clearall_in_class_at_safepoint(Klass* klass) { |
| 0 | 453 bool changed = true; |
| 454 // We are going to run thru the list of bkpts | |
| 455 // and delete some. This deletion probably alters | |
| 456 // the list in some implementation defined way such | |
| 457 // that when we delete entry i, the next entry might | |
| 458 // no longer be at i+1. To be safe, each time we delete | |
| 459 // an entry, we'll just start again from the beginning. | |
| 460 // We'll stop when we make a pass thru the whole list without | |
| 461 // deleting anything. | |
| 462 while (changed) { | |
| 463 int len = _bps.length(); | |
| 464 changed = false; | |
| 465 for (int i = 0; i < len; i++) { | |
| 466 JvmtiBreakpoint& bp = _bps.at(i); | |
| 467 if (bp.method()->method_holder() == klass) { | |
| 468 bp.clear(); | |
| 469 _bps.remove(i); | |
| 470 // This changed 'i' so we have to start over. | |
| 471 changed = true; | |
| 472 break; | |
| 473 } | |
| 474 } | |
| 475 } | |
| 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 | |
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510 void JvmtiCurrentBreakpoints::gc_epilogue() { |
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511 if (_jvmti_breakpoints != NULL) { |
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512 _jvmti_breakpoints->gc_epilogue(); |
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513 } |
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514 } |
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515 |
| 0 | 516 /////////////////////////////////////////////////////////////// |
| 517 // | |
| 518 // class VM_GetOrSetLocal | |
| 519 // | |
| 520 | |
| 521 // Constructor for non-object getter | |
| 522 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type) | |
| 523 : _thread(thread) | |
| 524 , _calling_thread(NULL) | |
| 525 , _depth(depth) | |
| 526 , _index(index) | |
| 527 , _type(type) | |
| 528 , _set(false) | |
| 529 , _jvf(NULL) | |
| 530 , _result(JVMTI_ERROR_NONE) | |
| 531 { | |
| 532 } | |
| 533 | |
| 534 // Constructor for object or non-object setter | |
| 535 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type, jvalue value) | |
| 536 : _thread(thread) | |
| 537 , _calling_thread(NULL) | |
| 538 , _depth(depth) | |
| 539 , _index(index) | |
| 540 , _type(type) | |
| 541 , _value(value) | |
| 542 , _set(true) | |
| 543 , _jvf(NULL) | |
| 544 , _result(JVMTI_ERROR_NONE) | |
| 545 { | |
| 546 } | |
| 547 | |
| 548 // Constructor for object getter | |
| 549 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, int index) | |
| 550 : _thread(thread) | |
| 551 , _calling_thread(calling_thread) | |
| 552 , _depth(depth) | |
| 553 , _index(index) | |
| 554 , _type(T_OBJECT) | |
| 555 , _set(false) | |
| 556 , _jvf(NULL) | |
| 557 , _result(JVMTI_ERROR_NONE) | |
| 558 { | |
| 559 } | |
| 560 | |
| 561 vframe *VM_GetOrSetLocal::get_vframe() { | |
| 562 if (!_thread->has_last_Java_frame()) { | |
| 563 return NULL; | |
| 564 } | |
| 565 RegisterMap reg_map(_thread); | |
| 566 vframe *vf = _thread->last_java_vframe(®_map); | |
| 567 int d = 0; | |
| 568 while ((vf != NULL) && (d < _depth)) { | |
| 569 vf = vf->java_sender(); | |
| 570 d++; | |
| 571 } | |
| 572 return vf; | |
| 573 } | |
| 574 | |
| 575 javaVFrame *VM_GetOrSetLocal::get_java_vframe() { | |
| 576 vframe* vf = get_vframe(); | |
| 577 if (vf == NULL) { | |
| 578 _result = JVMTI_ERROR_NO_MORE_FRAMES; | |
| 579 return NULL; | |
| 580 } | |
| 581 javaVFrame *jvf = (javaVFrame*)vf; | |
| 582 | |
| 2019 | 583 if (!vf->is_java_frame()) { |
| 0 | 584 _result = JVMTI_ERROR_OPAQUE_FRAME; |
| 585 return NULL; | |
| 586 } | |
| 587 return jvf; | |
| 588 } | |
| 589 | |
| 590 // Check that the klass is assignable to a type with the given signature. | |
| 591 // Another solution could be to use the function Klass::is_subtype_of(type). | |
| 592 // But the type class can be forced to load/initialize eagerly in such a case. | |
| 593 // This may cause unexpected consequences like CFLH or class-init JVMTI events. | |
| 594 // It is better to avoid such a behavior. | |
| 595 bool VM_GetOrSetLocal::is_assignable(const char* ty_sign, Klass* klass, Thread* thread) { | |
| 596 assert(ty_sign != NULL, "type signature must not be NULL"); | |
| 597 assert(thread != NULL, "thread must not be NULL"); | |
| 598 assert(klass != NULL, "klass must not be NULL"); | |
| 599 | |
| 600 int len = (int) strlen(ty_sign); | |
| 601 if (ty_sign[0] == 'L' && ty_sign[len-1] == ';') { // Need pure class/interface name | |
| 602 ty_sign++; | |
| 603 len -= 2; | |
| 604 } | |
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605 TempNewSymbol ty_sym = SymbolTable::new_symbol(ty_sign, len, thread); |
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606 if (klass->name() == ty_sym) { |
| 0 | 607 return true; |
| 608 } | |
| 609 // Compare primary supers | |
| 610 int super_depth = klass->super_depth(); | |
| 611 int idx; | |
| 612 for (idx = 0; idx < super_depth; idx++) { | |
| 6983 | 613 if (klass->primary_super_of_depth(idx)->name() == ty_sym) { |
| 0 | 614 return true; |
| 615 } | |
| 616 } | |
| 617 // Compare secondary supers | |
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618 Array<Klass*>* sec_supers = klass->secondary_supers(); |
| 0 | 619 for (idx = 0; idx < sec_supers->length(); idx++) { |
| 6983 | 620 if (((Klass*) sec_supers->at(idx))->name() == ty_sym) { |
| 0 | 621 return true; |
| 622 } | |
| 623 } | |
| 624 return false; | |
| 625 } | |
| 626 | |
| 627 // Checks error conditions: | |
| 628 // JVMTI_ERROR_INVALID_SLOT | |
| 629 // JVMTI_ERROR_TYPE_MISMATCH | |
| 630 // Returns: 'true' - everything is Ok, 'false' - error code | |
| 631 | |
| 632 bool VM_GetOrSetLocal::check_slot_type(javaVFrame* jvf) { | |
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633 Method* method_oop = jvf->method(); |
| 0 | 634 if (!method_oop->has_localvariable_table()) { |
| 635 // Just to check index boundaries | |
| 636 jint extra_slot = (_type == T_LONG || _type == T_DOUBLE) ? 1 : 0; | |
| 637 if (_index < 0 || _index + extra_slot >= method_oop->max_locals()) { | |
| 638 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 639 return false; | |
| 640 } | |
| 641 return true; | |
| 642 } | |
| 643 | |
| 644 jint num_entries = method_oop->localvariable_table_length(); | |
| 645 if (num_entries == 0) { | |
| 646 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 647 return false; // There are no slots | |
| 648 } | |
| 649 int signature_idx = -1; | |
| 650 int vf_bci = jvf->bci(); | |
| 651 LocalVariableTableElement* table = method_oop->localvariable_table_start(); | |
| 652 for (int i = 0; i < num_entries; i++) { | |
| 653 int start_bci = table[i].start_bci; | |
| 654 int end_bci = start_bci + table[i].length; | |
| 655 | |
| 656 // Here we assume that locations of LVT entries | |
| 657 // with the same slot number cannot be overlapped | |
| 658 if (_index == (jint) table[i].slot && start_bci <= vf_bci && vf_bci <= end_bci) { | |
| 659 signature_idx = (int) table[i].descriptor_cp_index; | |
| 660 break; | |
| 661 } | |
| 662 } | |
| 663 if (signature_idx == -1) { | |
| 664 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 665 return false; // Incorrect slot index | |
| 666 } | |
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667 Symbol* sign_sym = method_oop->constants()->symbol_at(signature_idx); |
| 0 | 668 const char* signature = (const char *) sign_sym->as_utf8(); |
| 669 BasicType slot_type = char2type(signature[0]); | |
| 670 | |
| 671 switch (slot_type) { | |
| 672 case T_BYTE: | |
| 673 case T_SHORT: | |
| 674 case T_CHAR: | |
| 675 case T_BOOLEAN: | |
| 676 slot_type = T_INT; | |
| 677 break; | |
| 678 case T_ARRAY: | |
| 679 slot_type = T_OBJECT; | |
| 680 break; | |
| 681 }; | |
| 682 if (_type != slot_type) { | |
| 683 _result = JVMTI_ERROR_TYPE_MISMATCH; | |
| 684 return false; | |
| 685 } | |
| 686 | |
| 687 jobject jobj = _value.l; | |
| 688 if (_set && slot_type == T_OBJECT && jobj != NULL) { // NULL reference is allowed | |
| 689 // Check that the jobject class matches the return type signature. | |
| 690 JavaThread* cur_thread = JavaThread::current(); | |
| 691 HandleMark hm(cur_thread); | |
| 692 | |
| 693 Handle obj = Handle(cur_thread, JNIHandles::resolve_external_guard(jobj)); | |
| 694 NULL_CHECK(obj, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
| 695 KlassHandle ob_kh = KlassHandle(cur_thread, obj->klass()); | |
| 696 NULL_CHECK(ob_kh, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
| 697 | |
| 6983 | 698 if (!is_assignable(signature, ob_kh(), cur_thread)) { |
| 0 | 699 _result = JVMTI_ERROR_TYPE_MISMATCH; |
| 700 return false; | |
| 701 } | |
| 702 } | |
| 703 return true; | |
| 704 } | |
| 705 | |
| 706 static bool can_be_deoptimized(vframe* vf) { | |
| 707 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized()); | |
| 708 } | |
| 709 | |
| 710 bool VM_GetOrSetLocal::doit_prologue() { | |
| 711 _jvf = get_java_vframe(); | |
| 712 NULL_CHECK(_jvf, false); | |
| 713 | |
| 2019 | 714 if (_jvf->method()->is_native()) { |
| 715 if (getting_receiver() && !_jvf->method()->is_static()) { | |
| 716 return true; | |
| 717 } else { | |
| 718 _result = JVMTI_ERROR_OPAQUE_FRAME; | |
| 719 return false; | |
| 720 } | |
| 721 } | |
| 722 | |
| 0 | 723 if (!check_slot_type(_jvf)) { |
| 724 return false; | |
| 725 } | |
| 726 return true; | |
| 727 } | |
| 728 | |
| 729 void VM_GetOrSetLocal::doit() { | |
| 730 if (_set) { | |
| 731 // Force deoptimization of frame if compiled because it's | |
| 732 // possible the compiler emitted some locals as constant values, | |
| 733 // meaning they are not mutable. | |
| 734 if (can_be_deoptimized(_jvf)) { | |
| 735 | |
| 736 // Schedule deoptimization so that eventually the local | |
| 737 // update will be written to an interpreter frame. | |
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738 Deoptimization::deoptimize_frame(_jvf->thread(), _jvf->fr().id()); |
| 0 | 739 |
| 740 // Now store a new value for the local which will be applied | |
| 741 // once deoptimization occurs. Note however that while this | |
| 742 // write is deferred until deoptimization actually happens | |
| 743 // can vframe created after this point will have its locals | |
| 744 // reflecting this update so as far as anyone can see the | |
| 745 // write has already taken place. | |
| 746 | |
| 747 // If we are updating an oop then get the oop from the handle | |
| 748 // since the handle will be long gone by the time the deopt | |
| 749 // happens. The oop stored in the deferred local will be | |
| 750 // gc'd on its own. | |
| 751 if (_type == T_OBJECT) { | |
| 752 _value.l = (jobject) (JNIHandles::resolve_external_guard(_value.l)); | |
| 753 } | |
| 754 // Re-read the vframe so we can see that it is deoptimized | |
| 755 // [ Only need because of assert in update_local() ] | |
| 756 _jvf = get_java_vframe(); | |
| 757 ((compiledVFrame*)_jvf)->update_local(_type, _index, _value); | |
| 758 return; | |
| 759 } | |
| 760 StackValueCollection *locals = _jvf->locals(); | |
| 761 HandleMark hm; | |
| 762 | |
| 763 switch (_type) { | |
| 2019 | 764 case T_INT: locals->set_int_at (_index, _value.i); break; |
| 765 case T_LONG: locals->set_long_at (_index, _value.j); break; | |
| 766 case T_FLOAT: locals->set_float_at (_index, _value.f); break; | |
| 767 case T_DOUBLE: locals->set_double_at(_index, _value.d); break; | |
| 768 case T_OBJECT: { | |
| 769 Handle ob_h(JNIHandles::resolve_external_guard(_value.l)); | |
| 770 locals->set_obj_at (_index, ob_h); | |
| 771 break; | |
| 772 } | |
| 773 default: ShouldNotReachHere(); | |
| 0 | 774 } |
| 775 _jvf->set_locals(locals); | |
| 776 } else { | |
| 2019 | 777 if (_jvf->method()->is_native() && _jvf->is_compiled_frame()) { |
| 778 assert(getting_receiver(), "Can only get here when getting receiver"); | |
| 779 oop receiver = _jvf->fr().get_native_receiver(); | |
| 780 _value.l = JNIHandles::make_local(_calling_thread, receiver); | |
| 781 } else { | |
| 782 StackValueCollection *locals = _jvf->locals(); | |
| 0 | 783 |
| 2019 | 784 if (locals->at(_index)->type() == T_CONFLICT) { |
| 785 memset(&_value, 0, sizeof(_value)); | |
| 786 _value.l = NULL; | |
| 787 return; | |
| 788 } | |
| 0 | 789 |
| 2019 | 790 switch (_type) { |
| 791 case T_INT: _value.i = locals->int_at (_index); break; | |
| 792 case T_LONG: _value.j = locals->long_at (_index); break; | |
| 793 case T_FLOAT: _value.f = locals->float_at (_index); break; | |
| 794 case T_DOUBLE: _value.d = locals->double_at(_index); break; | |
| 795 case T_OBJECT: { | |
| 796 // Wrap the oop to be returned in a local JNI handle since | |
| 797 // oops_do() no longer applies after doit() is finished. | |
| 798 oop obj = locals->obj_at(_index)(); | |
| 799 _value.l = JNIHandles::make_local(_calling_thread, obj); | |
| 800 break; | |
| 801 } | |
| 802 default: ShouldNotReachHere(); | |
| 803 } | |
| 0 | 804 } |
| 805 } | |
| 806 } | |
| 807 | |
| 808 | |
| 809 bool VM_GetOrSetLocal::allow_nested_vm_operations() const { | |
| 810 return true; // May need to deoptimize | |
| 811 } | |
| 812 | |
| 813 | |
| 2019 | 814 VM_GetReceiver::VM_GetReceiver( |
| 815 JavaThread* thread, JavaThread* caller_thread, jint depth) | |
| 816 : VM_GetOrSetLocal(thread, caller_thread, depth, 0) {} | |
| 817 | |
| 0 | 818 ///////////////////////////////////////////////////////////////////////////////////////// |
| 819 | |
| 820 // | |
| 821 // class JvmtiSuspendControl - see comments in jvmtiImpl.hpp | |
| 822 // | |
| 823 | |
| 824 bool JvmtiSuspendControl::suspend(JavaThread *java_thread) { | |
| 825 // external suspend should have caught suspending a thread twice | |
| 826 | |
| 827 // Immediate suspension required for JPDA back-end so JVMTI agent threads do | |
| 828 // not deadlock due to later suspension on transitions while holding | |
| 829 // raw monitors. Passing true causes the immediate suspension. | |
| 830 // java_suspend() will catch threads in the process of exiting | |
| 831 // and will ignore them. | |
| 832 java_thread->java_suspend(); | |
| 833 | |
| 834 // It would be nice to have the following assertion in all the time, | |
| 835 // but it is possible for a racing resume request to have resumed | |
| 836 // this thread right after we suspended it. Temporarily enable this | |
| 837 // assertion if you are chasing a different kind of bug. | |
| 838 // | |
| 839 // assert(java_lang_Thread::thread(java_thread->threadObj()) == NULL || | |
| 840 // java_thread->is_being_ext_suspended(), "thread is not suspended"); | |
| 841 | |
| 842 if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) { | |
| 843 // check again because we can get delayed in java_suspend(): | |
| 844 // the thread is in process of exiting. | |
| 845 return false; | |
| 846 } | |
| 847 | |
| 848 return true; | |
| 849 } | |
| 850 | |
| 851 bool JvmtiSuspendControl::resume(JavaThread *java_thread) { | |
| 852 // external suspend should have caught resuming a thread twice | |
| 853 assert(java_thread->is_being_ext_suspended(), "thread should be suspended"); | |
| 854 | |
| 855 // resume thread | |
| 856 { | |
| 857 // must always grab Threads_lock, see JVM_SuspendThread | |
| 858 MutexLocker ml(Threads_lock); | |
| 859 java_thread->java_resume(); | |
| 860 } | |
| 861 | |
| 862 return true; | |
| 863 } | |
| 864 | |
| 865 | |
| 866 void JvmtiSuspendControl::print() { | |
| 867 #ifndef PRODUCT | |
| 868 MutexLocker mu(Threads_lock); | |
| 869 ResourceMark rm; | |
| 870 | |
| 871 tty->print("Suspended Threads: ["); | |
| 872 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
| 8721 | 873 #ifdef JVMTI_TRACE |
| 0 | 874 const char *name = JvmtiTrace::safe_get_thread_name(thread); |
| 875 #else | |
| 876 const char *name = ""; | |
| 877 #endif /*JVMTI_TRACE */ | |
| 878 tty->print("%s(%c ", name, thread->is_being_ext_suspended() ? 'S' : '_'); | |
| 879 if (!thread->has_last_Java_frame()) { | |
| 880 tty->print("no stack"); | |
| 881 } | |
| 882 tty->print(") "); | |
| 883 } | |
| 884 tty->print_cr("]"); | |
| 885 #endif | |
| 886 } | |
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887 |
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888 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_load_event( |
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889 nmethod* nm) { |
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890 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_LOAD); |
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891 event._event_data.compiled_method_load = nm; |
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892 // Keep the nmethod alive until the ServiceThread can process |
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893 // this deferred event. |
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894 nmethodLocker::lock_nmethod(nm); |
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895 return event; |
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896 } |
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897 |
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898 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_unload_event( |
|
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899 nmethod* nm, jmethodID id, const void* code) { |
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900 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_UNLOAD); |
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901 event._event_data.compiled_method_unload.nm = nm; |
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902 event._event_data.compiled_method_unload.method_id = id; |
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903 event._event_data.compiled_method_unload.code_begin = code; |
|
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904 // Keep the nmethod alive until the ServiceThread can process |
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905 // this deferred event. This will keep the memory for the |
|
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906 // generated code from being reused too early. We pass |
|
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907 // zombie_ok == true here so that our nmethod that was just |
|
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908 // made into a zombie can be locked. |
|
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909 nmethodLocker::lock_nmethod(nm, true /* zombie_ok */); |
|
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910 return event; |
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911 } |
|
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|
912 |
|
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913 JvmtiDeferredEvent JvmtiDeferredEvent::dynamic_code_generated_event( |
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914 const char* name, const void* code_begin, const void* code_end) { |
|
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915 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_DYNAMIC_CODE_GENERATED); |
|
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916 // Need to make a copy of the name since we don't know how long |
|
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|
917 // the event poster will keep it around after we enqueue the |
|
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918 // deferred event and return. strdup() failure is handled in |
|
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|
919 // the post() routine below. |
|
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920 event._event_data.dynamic_code_generated.name = os::strdup(name); |
|
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921 event._event_data.dynamic_code_generated.code_begin = code_begin; |
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922 event._event_data.dynamic_code_generated.code_end = code_end; |
|
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923 return event; |
|
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924 } |
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|
925 |
|
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926 void JvmtiDeferredEvent::post() { |
|
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|
927 assert(ServiceThread::is_service_thread(Thread::current()), |
|
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|
928 "Service thread must post enqueued events"); |
|
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929 switch(_type) { |
|
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930 case TYPE_COMPILED_METHOD_LOAD: { |
|
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931 nmethod* nm = _event_data.compiled_method_load; |
|
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|
932 JvmtiExport::post_compiled_method_load(nm); |
|
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|
933 // done with the deferred event so unlock the nmethod |
|
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|
934 nmethodLocker::unlock_nmethod(nm); |
|
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|
935 break; |
|
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|
936 } |
|
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|
937 case TYPE_COMPILED_METHOD_UNLOAD: { |
|
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|
938 nmethod* nm = _event_data.compiled_method_unload.nm; |
|
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|
939 JvmtiExport::post_compiled_method_unload( |
|
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|
940 _event_data.compiled_method_unload.method_id, |
|
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|
941 _event_data.compiled_method_unload.code_begin); |
|
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|
942 // done with the deferred event so unlock the nmethod |
|
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|
943 nmethodLocker::unlock_nmethod(nm); |
|
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|
944 break; |
|
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|
945 } |
|
3304
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|
946 case TYPE_DYNAMIC_CODE_GENERATED: { |
|
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|
947 JvmtiExport::post_dynamic_code_generated_internal( |
|
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|
948 // if strdup failed give the event a default name |
|
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changeset
|
949 (_event_data.dynamic_code_generated.name == NULL) |
|
0cddebc420d8
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|
950 ? "unknown_code" : _event_data.dynamic_code_generated.name, |
|
2301
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|
951 _event_data.dynamic_code_generated.code_begin, |
|
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|
952 _event_data.dynamic_code_generated.code_end); |
|
3304
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|
953 if (_event_data.dynamic_code_generated.name != NULL) { |
|
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|
954 // release our copy |
|
0cddebc420d8
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changeset
|
955 os::free((void *)_event_data.dynamic_code_generated.name); |
|
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changeset
|
956 } |
|
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|
957 break; |
|
3304
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|
958 } |
|
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changeset
|
959 default: |
|
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changeset
|
960 ShouldNotReachHere(); |
|
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|
961 } |
|
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|
962 } |
|
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changeset
|
963 |
|
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|
964 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_tail = NULL; |
|
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|
965 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_head = NULL; |
|
bf8517f4e4d0
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changeset
|
966 |
|
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changeset
|
967 volatile JvmtiDeferredEventQueue::QueueNode* |
|
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|
968 JvmtiDeferredEventQueue::_pending_list = NULL; |
|
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changeset
|
969 |
|
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changeset
|
970 bool JvmtiDeferredEventQueue::has_events() { |
|
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|
971 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
|
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|
972 return _queue_head != NULL || _pending_list != NULL; |
|
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|
973 } |
|
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|
974 |
|
bf8517f4e4d0
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changeset
|
975 void JvmtiDeferredEventQueue::enqueue(const JvmtiDeferredEvent& event) { |
|
bf8517f4e4d0
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changeset
|
976 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
|
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changeset
|
977 |
|
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changeset
|
978 process_pending_events(); |
|
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changeset
|
979 |
|
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changeset
|
980 // Events get added to the end of the queue (and are pulled off the front). |
|
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|
981 QueueNode* node = new QueueNode(event); |
|
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changeset
|
982 if (_queue_tail == NULL) { |
|
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changeset
|
983 _queue_tail = _queue_head = node; |
|
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|
984 } else { |
|
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changeset
|
985 assert(_queue_tail->next() == NULL, "Must be the last element in the list"); |
|
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changeset
|
986 _queue_tail->set_next(node); |
|
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changeset
|
987 _queue_tail = node; |
|
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988 } |
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989 |
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990 Service_lock->notify_all(); |
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991 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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992 "Inconsistent queue markers"); |
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993 } |
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994 |
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995 JvmtiDeferredEvent JvmtiDeferredEventQueue::dequeue() { |
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996 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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997 |
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998 process_pending_events(); |
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999 |
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1000 assert(_queue_head != NULL, "Nothing to dequeue"); |
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1001 |
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1002 if (_queue_head == NULL) { |
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1003 // Just in case this happens in product; it shouldn't but let's not crash |
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1004 return JvmtiDeferredEvent(); |
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1005 } |
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1006 |
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1007 QueueNode* node = _queue_head; |
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1008 _queue_head = _queue_head->next(); |
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1009 if (_queue_head == NULL) { |
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1010 _queue_tail = NULL; |
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1011 } |
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1012 |
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1013 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1014 "Inconsistent queue markers"); |
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1015 |
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1016 JvmtiDeferredEvent event = node->event(); |
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1017 delete node; |
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1018 return event; |
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1019 } |
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1020 |
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1021 void JvmtiDeferredEventQueue::add_pending_event( |
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1022 const JvmtiDeferredEvent& event) { |
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1023 |
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1024 QueueNode* node = new QueueNode(event); |
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1025 |
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1026 bool success = false; |
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1027 QueueNode* prev_value = (QueueNode*)_pending_list; |
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1028 do { |
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1029 node->set_next(prev_value); |
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1030 prev_value = (QueueNode*)Atomic::cmpxchg_ptr( |
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1031 (void*)node, (volatile void*)&_pending_list, (void*)node->next()); |
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1032 } while (prev_value != node->next()); |
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1033 } |
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1034 |
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1035 // This method transfers any events that were added by someone NOT holding |
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1036 // the lock into the mainline queue. |
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1037 void JvmtiDeferredEventQueue::process_pending_events() { |
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1038 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1039 |
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1040 if (_pending_list != NULL) { |
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1041 QueueNode* head = |
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1042 (QueueNode*)Atomic::xchg_ptr(NULL, (volatile void*)&_pending_list); |
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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 if (head != NULL) { |
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1048 // Since we've treated the pending list as a stack (with newer |
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1049 // events at the beginning), we need to join the bottom of the stack |
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1050 // with the 'tail' of the queue in order to get the events in the |
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1051 // right order. We do this by reversing the pending list and appending |
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1052 // it to the queue. |
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1053 |
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1054 QueueNode* new_tail = head; |
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1055 QueueNode* new_head = NULL; |
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1056 |
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1057 // This reverses the list |
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1058 QueueNode* prev = new_tail; |
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1059 QueueNode* node = new_tail->next(); |
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1060 new_tail->set_next(NULL); |
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1061 while (node != NULL) { |
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1062 QueueNode* next = node->next(); |
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1063 node->set_next(prev); |
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1064 prev = node; |
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1065 node = next; |
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1066 } |
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1067 new_head = prev; |
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1068 |
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1069 // Now append the new list to the queue |
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1070 if (_queue_tail != NULL) { |
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1071 _queue_tail->set_next(new_head); |
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1072 } else { // _queue_head == NULL |
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1073 _queue_head = new_head; |
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1074 } |
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1075 _queue_tail = new_tail; |
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1076 } |
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1077 } |
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1078 } |