Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiImpl.cpp @ 8124:5fc51c1ecdeb
Merge.
| author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
|---|---|
| date | Tue, 05 Mar 2013 23:44:54 +0100 |
| parents | 291ffc492eb6 8b46b0196eb0 |
| children | b9a918201d47 |
| 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 case CLEAR_ALL_BREAKPOINT: | |
| 364 _breakpoints->clearall_at_safepoint(); | |
| 365 break; | |
| 366 default: | |
| 367 assert(false, "Unknown operation"); | |
| 368 } | |
| 369 } | |
| 370 | |
| 371 void VM_ChangeBreakpoints::oops_do(OopClosure* f) { | |
| 372 // This operation keeps breakpoints alive | |
| 373 if (_breakpoints != NULL) { | |
| 374 _breakpoints->oops_do(f); | |
| 375 } | |
| 376 if (_bp != NULL) { | |
| 377 _bp->oops_do(f); | |
| 378 } | |
| 379 } | |
| 380 | |
| 381 // | |
| 382 // class JvmtiBreakpoints | |
| 383 // | |
| 384 // a JVMTI internal collection of JvmtiBreakpoint | |
| 385 // | |
| 386 | |
| 387 JvmtiBreakpoints::JvmtiBreakpoints(void listener_fun(void *,address *)) { | |
| 388 _bps.initialize(this,listener_fun); | |
| 389 } | |
| 390 | |
| 391 JvmtiBreakpoints:: ~JvmtiBreakpoints() {} | |
| 392 | |
| 393 void JvmtiBreakpoints::oops_do(OopClosure* f) { | |
| 394 _bps.oops_do(f); | |
| 395 } | |
| 396 | |
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397 void JvmtiBreakpoints::gc_epilogue() { |
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398 _bps.gc_epilogue(); |
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399 } |
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400 |
| 0 | 401 void JvmtiBreakpoints::print() { |
| 402 #ifndef PRODUCT | |
| 403 ResourceMark rm; | |
| 404 | |
| 405 int n = _bps.length(); | |
| 406 for (int i=0; i<n; i++) { | |
| 407 JvmtiBreakpoint& bp = _bps.at(i); | |
| 408 tty->print("%d: ", i); | |
| 409 bp.print(); | |
| 410 tty->print_cr(""); | |
| 411 } | |
| 412 #endif | |
| 413 } | |
| 414 | |
| 415 | |
| 416 void JvmtiBreakpoints::set_at_safepoint(JvmtiBreakpoint& bp) { | |
| 417 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 418 | |
| 419 int i = _bps.find(bp); | |
| 420 if (i == -1) { | |
| 421 _bps.append(bp); | |
| 422 bp.set(); | |
| 423 } | |
| 424 } | |
| 425 | |
| 426 void JvmtiBreakpoints::clear_at_safepoint(JvmtiBreakpoint& bp) { | |
| 427 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 428 | |
| 429 int i = _bps.find(bp); | |
| 430 if (i != -1) { | |
| 431 _bps.remove(i); | |
| 432 bp.clear(); | |
| 433 } | |
| 434 } | |
| 435 | |
| 436 void JvmtiBreakpoints::clearall_at_safepoint() { | |
| 437 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 438 | |
| 439 int len = _bps.length(); | |
| 440 for (int i=0; i<len; i++) { | |
| 441 _bps.at(i).clear(); | |
| 442 } | |
| 443 _bps.clear(); | |
| 444 } | |
| 445 | |
| 446 int JvmtiBreakpoints::length() { return _bps.length(); } | |
| 447 | |
| 448 int JvmtiBreakpoints::set(JvmtiBreakpoint& bp) { | |
| 449 if ( _bps.find(bp) != -1) { | |
| 450 return JVMTI_ERROR_DUPLICATE; | |
| 451 } | |
| 452 VM_ChangeBreakpoints set_breakpoint(this,VM_ChangeBreakpoints::SET_BREAKPOINT, &bp); | |
| 453 VMThread::execute(&set_breakpoint); | |
| 454 return JVMTI_ERROR_NONE; | |
| 455 } | |
| 456 | |
| 457 int JvmtiBreakpoints::clear(JvmtiBreakpoint& bp) { | |
| 458 if ( _bps.find(bp) == -1) { | |
| 459 return JVMTI_ERROR_NOT_FOUND; | |
| 460 } | |
| 461 | |
| 462 VM_ChangeBreakpoints clear_breakpoint(this,VM_ChangeBreakpoints::CLEAR_BREAKPOINT, &bp); | |
| 463 VMThread::execute(&clear_breakpoint); | |
| 464 return JVMTI_ERROR_NONE; | |
| 465 } | |
| 466 | |
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467 void JvmtiBreakpoints::clearall_in_class_at_safepoint(Klass* klass) { |
| 0 | 468 bool changed = true; |
| 469 // We are going to run thru the list of bkpts | |
| 470 // and delete some. This deletion probably alters | |
| 471 // the list in some implementation defined way such | |
| 472 // that when we delete entry i, the next entry might | |
| 473 // no longer be at i+1. To be safe, each time we delete | |
| 474 // an entry, we'll just start again from the beginning. | |
| 475 // We'll stop when we make a pass thru the whole list without | |
| 476 // deleting anything. | |
| 477 while (changed) { | |
| 478 int len = _bps.length(); | |
| 479 changed = false; | |
| 480 for (int i = 0; i < len; i++) { | |
| 481 JvmtiBreakpoint& bp = _bps.at(i); | |
| 482 if (bp.method()->method_holder() == klass) { | |
| 483 bp.clear(); | |
| 484 _bps.remove(i); | |
| 485 // This changed 'i' so we have to start over. | |
| 486 changed = true; | |
| 487 break; | |
| 488 } | |
| 489 } | |
| 490 } | |
| 491 } | |
| 492 | |
| 493 void JvmtiBreakpoints::clearall() { | |
| 494 VM_ChangeBreakpoints clearall_breakpoint(this,VM_ChangeBreakpoints::CLEAR_ALL_BREAKPOINT); | |
| 495 VMThread::execute(&clearall_breakpoint); | |
| 496 } | |
| 497 | |
| 498 // | |
| 499 // class JvmtiCurrentBreakpoints | |
| 500 // | |
| 501 | |
| 502 JvmtiBreakpoints *JvmtiCurrentBreakpoints::_jvmti_breakpoints = NULL; | |
| 503 address * JvmtiCurrentBreakpoints::_breakpoint_list = NULL; | |
| 504 | |
| 505 | |
| 506 JvmtiBreakpoints& JvmtiCurrentBreakpoints::get_jvmti_breakpoints() { | |
| 507 if (_jvmti_breakpoints != NULL) return (*_jvmti_breakpoints); | |
| 508 _jvmti_breakpoints = new JvmtiBreakpoints(listener_fun); | |
| 509 assert(_jvmti_breakpoints != NULL, "_jvmti_breakpoints != NULL"); | |
| 510 return (*_jvmti_breakpoints); | |
| 511 } | |
| 512 | |
| 513 void JvmtiCurrentBreakpoints::listener_fun(void *this_obj, address *cache) { | |
| 514 JvmtiBreakpoints *this_jvmti = (JvmtiBreakpoints *) this_obj; | |
| 515 assert(this_jvmti != NULL, "this_jvmti != NULL"); | |
| 516 | |
| 517 debug_only(int n = this_jvmti->length();); | |
| 518 assert(cache[n] == NULL, "cache must be NULL terminated"); | |
| 519 | |
| 520 set_breakpoint_list(cache); | |
| 521 } | |
| 522 | |
| 523 | |
| 524 void JvmtiCurrentBreakpoints::oops_do(OopClosure* f) { | |
| 525 if (_jvmti_breakpoints != NULL) { | |
| 526 _jvmti_breakpoints->oops_do(f); | |
| 527 } | |
| 528 } | |
| 529 | |
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530 void JvmtiCurrentBreakpoints::gc_epilogue() { |
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531 if (_jvmti_breakpoints != NULL) { |
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532 _jvmti_breakpoints->gc_epilogue(); |
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533 } |
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534 } |
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535 |
| 0 | 536 /////////////////////////////////////////////////////////////// |
| 537 // | |
| 538 // class VM_GetOrSetLocal | |
| 539 // | |
| 540 | |
| 541 // Constructor for non-object getter | |
| 542 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type) | |
| 543 : _thread(thread) | |
| 544 , _calling_thread(NULL) | |
| 545 , _depth(depth) | |
| 546 , _index(index) | |
| 547 , _type(type) | |
| 548 , _set(false) | |
| 549 , _jvf(NULL) | |
| 550 , _result(JVMTI_ERROR_NONE) | |
| 551 { | |
| 552 } | |
| 553 | |
| 554 // Constructor for object or non-object setter | |
| 555 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type, jvalue value) | |
| 556 : _thread(thread) | |
| 557 , _calling_thread(NULL) | |
| 558 , _depth(depth) | |
| 559 , _index(index) | |
| 560 , _type(type) | |
| 561 , _value(value) | |
| 562 , _set(true) | |
| 563 , _jvf(NULL) | |
| 564 , _result(JVMTI_ERROR_NONE) | |
| 565 { | |
| 566 } | |
| 567 | |
| 568 // Constructor for object getter | |
| 569 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, int index) | |
| 570 : _thread(thread) | |
| 571 , _calling_thread(calling_thread) | |
| 572 , _depth(depth) | |
| 573 , _index(index) | |
| 574 , _type(T_OBJECT) | |
| 575 , _set(false) | |
| 576 , _jvf(NULL) | |
| 577 , _result(JVMTI_ERROR_NONE) | |
| 578 { | |
| 579 } | |
| 580 | |
| 581 vframe *VM_GetOrSetLocal::get_vframe() { | |
| 582 if (!_thread->has_last_Java_frame()) { | |
| 583 return NULL; | |
| 584 } | |
| 585 RegisterMap reg_map(_thread); | |
| 586 vframe *vf = _thread->last_java_vframe(®_map); | |
| 587 int d = 0; | |
| 588 while ((vf != NULL) && (d < _depth)) { | |
| 589 vf = vf->java_sender(); | |
| 590 d++; | |
| 591 } | |
| 592 return vf; | |
| 593 } | |
| 594 | |
| 595 javaVFrame *VM_GetOrSetLocal::get_java_vframe() { | |
| 596 vframe* vf = get_vframe(); | |
| 597 if (vf == NULL) { | |
| 598 _result = JVMTI_ERROR_NO_MORE_FRAMES; | |
| 599 return NULL; | |
| 600 } | |
| 601 javaVFrame *jvf = (javaVFrame*)vf; | |
| 602 | |
| 2019 | 603 if (!vf->is_java_frame()) { |
| 0 | 604 _result = JVMTI_ERROR_OPAQUE_FRAME; |
| 605 return NULL; | |
| 606 } | |
| 607 return jvf; | |
| 608 } | |
| 609 | |
| 610 // Check that the klass is assignable to a type with the given signature. | |
| 611 // Another solution could be to use the function Klass::is_subtype_of(type). | |
| 612 // But the type class can be forced to load/initialize eagerly in such a case. | |
| 613 // This may cause unexpected consequences like CFLH or class-init JVMTI events. | |
| 614 // It is better to avoid such a behavior. | |
| 615 bool VM_GetOrSetLocal::is_assignable(const char* ty_sign, Klass* klass, Thread* thread) { | |
| 616 assert(ty_sign != NULL, "type signature must not be NULL"); | |
| 617 assert(thread != NULL, "thread must not be NULL"); | |
| 618 assert(klass != NULL, "klass must not be NULL"); | |
| 619 | |
| 620 int len = (int) strlen(ty_sign); | |
| 621 if (ty_sign[0] == 'L' && ty_sign[len-1] == ';') { // Need pure class/interface name | |
| 622 ty_sign++; | |
| 623 len -= 2; | |
| 624 } | |
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625 TempNewSymbol ty_sym = SymbolTable::new_symbol(ty_sign, len, thread); |
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626 if (klass->name() == ty_sym) { |
| 0 | 627 return true; |
| 628 } | |
| 629 // Compare primary supers | |
| 630 int super_depth = klass->super_depth(); | |
| 631 int idx; | |
| 632 for (idx = 0; idx < super_depth; idx++) { | |
| 6983 | 633 if (klass->primary_super_of_depth(idx)->name() == ty_sym) { |
| 0 | 634 return true; |
| 635 } | |
| 636 } | |
| 637 // Compare secondary supers | |
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638 Array<Klass*>* sec_supers = klass->secondary_supers(); |
| 0 | 639 for (idx = 0; idx < sec_supers->length(); idx++) { |
| 6983 | 640 if (((Klass*) sec_supers->at(idx))->name() == ty_sym) { |
| 0 | 641 return true; |
| 642 } | |
| 643 } | |
| 644 return false; | |
| 645 } | |
| 646 | |
| 647 // Checks error conditions: | |
| 648 // JVMTI_ERROR_INVALID_SLOT | |
| 649 // JVMTI_ERROR_TYPE_MISMATCH | |
| 650 // Returns: 'true' - everything is Ok, 'false' - error code | |
| 651 | |
| 652 bool VM_GetOrSetLocal::check_slot_type(javaVFrame* jvf) { | |
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653 Method* method_oop = jvf->method(); |
| 0 | 654 if (!method_oop->has_localvariable_table()) { |
| 655 // Just to check index boundaries | |
| 656 jint extra_slot = (_type == T_LONG || _type == T_DOUBLE) ? 1 : 0; | |
| 657 if (_index < 0 || _index + extra_slot >= method_oop->max_locals()) { | |
| 658 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 659 return false; | |
| 660 } | |
| 661 return true; | |
| 662 } | |
| 663 | |
| 664 jint num_entries = method_oop->localvariable_table_length(); | |
| 665 if (num_entries == 0) { | |
| 666 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 667 return false; // There are no slots | |
| 668 } | |
| 669 int signature_idx = -1; | |
| 670 int vf_bci = jvf->bci(); | |
| 671 LocalVariableTableElement* table = method_oop->localvariable_table_start(); | |
| 672 for (int i = 0; i < num_entries; i++) { | |
| 673 int start_bci = table[i].start_bci; | |
| 674 int end_bci = start_bci + table[i].length; | |
| 675 | |
| 676 // Here we assume that locations of LVT entries | |
| 677 // with the same slot number cannot be overlapped | |
| 678 if (_index == (jint) table[i].slot && start_bci <= vf_bci && vf_bci <= end_bci) { | |
| 679 signature_idx = (int) table[i].descriptor_cp_index; | |
| 680 break; | |
| 681 } | |
| 682 } | |
| 683 if (signature_idx == -1) { | |
| 684 _result = JVMTI_ERROR_INVALID_SLOT; | |
| 685 return false; // Incorrect slot index | |
| 686 } | |
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687 Symbol* sign_sym = method_oop->constants()->symbol_at(signature_idx); |
| 0 | 688 const char* signature = (const char *) sign_sym->as_utf8(); |
| 689 BasicType slot_type = char2type(signature[0]); | |
| 690 | |
| 691 switch (slot_type) { | |
| 692 case T_BYTE: | |
| 693 case T_SHORT: | |
| 694 case T_CHAR: | |
| 695 case T_BOOLEAN: | |
| 696 slot_type = T_INT; | |
| 697 break; | |
| 698 case T_ARRAY: | |
| 699 slot_type = T_OBJECT; | |
| 700 break; | |
| 701 }; | |
| 702 if (_type != slot_type) { | |
| 703 _result = JVMTI_ERROR_TYPE_MISMATCH; | |
| 704 return false; | |
| 705 } | |
| 706 | |
| 707 jobject jobj = _value.l; | |
| 708 if (_set && slot_type == T_OBJECT && jobj != NULL) { // NULL reference is allowed | |
| 709 // Check that the jobject class matches the return type signature. | |
| 710 JavaThread* cur_thread = JavaThread::current(); | |
| 711 HandleMark hm(cur_thread); | |
| 712 | |
| 713 Handle obj = Handle(cur_thread, JNIHandles::resolve_external_guard(jobj)); | |
| 714 NULL_CHECK(obj, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
| 715 KlassHandle ob_kh = KlassHandle(cur_thread, obj->klass()); | |
| 716 NULL_CHECK(ob_kh, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
| 717 | |
| 6983 | 718 if (!is_assignable(signature, ob_kh(), cur_thread)) { |
| 0 | 719 _result = JVMTI_ERROR_TYPE_MISMATCH; |
| 720 return false; | |
| 721 } | |
| 722 } | |
| 723 return true; | |
| 724 } | |
| 725 | |
| 726 static bool can_be_deoptimized(vframe* vf) { | |
| 727 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized()); | |
| 728 } | |
| 729 | |
| 730 bool VM_GetOrSetLocal::doit_prologue() { | |
| 731 _jvf = get_java_vframe(); | |
| 732 NULL_CHECK(_jvf, false); | |
| 733 | |
| 2019 | 734 if (_jvf->method()->is_native()) { |
| 735 if (getting_receiver() && !_jvf->method()->is_static()) { | |
| 736 return true; | |
| 737 } else { | |
| 738 _result = JVMTI_ERROR_OPAQUE_FRAME; | |
| 739 return false; | |
| 740 } | |
| 741 } | |
| 742 | |
| 0 | 743 if (!check_slot_type(_jvf)) { |
| 744 return false; | |
| 745 } | |
| 746 return true; | |
| 747 } | |
| 748 | |
| 749 void VM_GetOrSetLocal::doit() { | |
| 750 if (_set) { | |
| 751 // Force deoptimization of frame if compiled because it's | |
| 752 // possible the compiler emitted some locals as constant values, | |
| 753 // meaning they are not mutable. | |
| 754 if (can_be_deoptimized(_jvf)) { | |
| 755 | |
| 756 // Schedule deoptimization so that eventually the local | |
| 757 // update will be written to an interpreter frame. | |
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758 Deoptimization::deoptimize_frame(_jvf->thread(), _jvf->fr().id(), Deoptimization::Reason_constraint); |
| 0 | 759 |
| 760 // Now store a new value for the local which will be applied | |
| 761 // once deoptimization occurs. Note however that while this | |
| 762 // write is deferred until deoptimization actually happens | |
| 763 // can vframe created after this point will have its locals | |
| 764 // reflecting this update so as far as anyone can see the | |
| 765 // write has already taken place. | |
| 766 | |
| 767 // If we are updating an oop then get the oop from the handle | |
| 768 // since the handle will be long gone by the time the deopt | |
| 769 // happens. The oop stored in the deferred local will be | |
| 770 // gc'd on its own. | |
| 771 if (_type == T_OBJECT) { | |
| 772 _value.l = (jobject) (JNIHandles::resolve_external_guard(_value.l)); | |
| 773 } | |
| 774 // Re-read the vframe so we can see that it is deoptimized | |
| 775 // [ Only need because of assert in update_local() ] | |
| 776 _jvf = get_java_vframe(); | |
| 777 ((compiledVFrame*)_jvf)->update_local(_type, _index, _value); | |
| 778 return; | |
| 779 } | |
| 780 StackValueCollection *locals = _jvf->locals(); | |
| 781 HandleMark hm; | |
| 782 | |
| 783 switch (_type) { | |
| 2019 | 784 case T_INT: locals->set_int_at (_index, _value.i); break; |
| 785 case T_LONG: locals->set_long_at (_index, _value.j); break; | |
| 786 case T_FLOAT: locals->set_float_at (_index, _value.f); break; | |
| 787 case T_DOUBLE: locals->set_double_at(_index, _value.d); break; | |
| 788 case T_OBJECT: { | |
| 789 Handle ob_h(JNIHandles::resolve_external_guard(_value.l)); | |
| 790 locals->set_obj_at (_index, ob_h); | |
| 791 break; | |
| 792 } | |
| 793 default: ShouldNotReachHere(); | |
| 0 | 794 } |
| 795 _jvf->set_locals(locals); | |
| 796 } else { | |
| 2019 | 797 if (_jvf->method()->is_native() && _jvf->is_compiled_frame()) { |
| 798 assert(getting_receiver(), "Can only get here when getting receiver"); | |
| 799 oop receiver = _jvf->fr().get_native_receiver(); | |
| 800 _value.l = JNIHandles::make_local(_calling_thread, receiver); | |
| 801 } else { | |
| 802 StackValueCollection *locals = _jvf->locals(); | |
| 0 | 803 |
| 2019 | 804 if (locals->at(_index)->type() == T_CONFLICT) { |
| 805 memset(&_value, 0, sizeof(_value)); | |
| 806 _value.l = NULL; | |
| 807 return; | |
| 808 } | |
| 0 | 809 |
| 2019 | 810 switch (_type) { |
| 811 case T_INT: _value.i = locals->int_at (_index); break; | |
| 812 case T_LONG: _value.j = locals->long_at (_index); break; | |
| 813 case T_FLOAT: _value.f = locals->float_at (_index); break; | |
| 814 case T_DOUBLE: _value.d = locals->double_at(_index); break; | |
| 815 case T_OBJECT: { | |
| 816 // Wrap the oop to be returned in a local JNI handle since | |
| 817 // oops_do() no longer applies after doit() is finished. | |
| 818 oop obj = locals->obj_at(_index)(); | |
| 819 _value.l = JNIHandles::make_local(_calling_thread, obj); | |
| 820 break; | |
| 821 } | |
| 822 default: ShouldNotReachHere(); | |
| 823 } | |
| 0 | 824 } |
| 825 } | |
| 826 } | |
| 827 | |
| 828 | |
| 829 bool VM_GetOrSetLocal::allow_nested_vm_operations() const { | |
| 830 return true; // May need to deoptimize | |
| 831 } | |
| 832 | |
| 833 | |
| 2019 | 834 VM_GetReceiver::VM_GetReceiver( |
| 835 JavaThread* thread, JavaThread* caller_thread, jint depth) | |
| 836 : VM_GetOrSetLocal(thread, caller_thread, depth, 0) {} | |
| 837 | |
| 0 | 838 ///////////////////////////////////////////////////////////////////////////////////////// |
| 839 | |
| 840 // | |
| 841 // class JvmtiSuspendControl - see comments in jvmtiImpl.hpp | |
| 842 // | |
| 843 | |
| 844 bool JvmtiSuspendControl::suspend(JavaThread *java_thread) { | |
| 845 // external suspend should have caught suspending a thread twice | |
| 846 | |
| 847 // Immediate suspension required for JPDA back-end so JVMTI agent threads do | |
| 848 // not deadlock due to later suspension on transitions while holding | |
| 849 // raw monitors. Passing true causes the immediate suspension. | |
| 850 // java_suspend() will catch threads in the process of exiting | |
| 851 // and will ignore them. | |
| 852 java_thread->java_suspend(); | |
| 853 | |
| 854 // It would be nice to have the following assertion in all the time, | |
| 855 // but it is possible for a racing resume request to have resumed | |
| 856 // this thread right after we suspended it. Temporarily enable this | |
| 857 // assertion if you are chasing a different kind of bug. | |
| 858 // | |
| 859 // assert(java_lang_Thread::thread(java_thread->threadObj()) == NULL || | |
| 860 // java_thread->is_being_ext_suspended(), "thread is not suspended"); | |
| 861 | |
| 862 if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) { | |
| 863 // check again because we can get delayed in java_suspend(): | |
| 864 // the thread is in process of exiting. | |
| 865 return false; | |
| 866 } | |
| 867 | |
| 868 return true; | |
| 869 } | |
| 870 | |
| 871 bool JvmtiSuspendControl::resume(JavaThread *java_thread) { | |
| 872 // external suspend should have caught resuming a thread twice | |
| 873 assert(java_thread->is_being_ext_suspended(), "thread should be suspended"); | |
| 874 | |
| 875 // resume thread | |
| 876 { | |
| 877 // must always grab Threads_lock, see JVM_SuspendThread | |
| 878 MutexLocker ml(Threads_lock); | |
| 879 java_thread->java_resume(); | |
| 880 } | |
| 881 | |
| 882 return true; | |
| 883 } | |
| 884 | |
| 885 | |
| 886 void JvmtiSuspendControl::print() { | |
| 887 #ifndef PRODUCT | |
| 888 MutexLocker mu(Threads_lock); | |
| 889 ResourceMark rm; | |
| 890 | |
| 891 tty->print("Suspended Threads: ["); | |
| 892 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
| 893 #if JVMTI_TRACE | |
| 894 const char *name = JvmtiTrace::safe_get_thread_name(thread); | |
| 895 #else | |
| 896 const char *name = ""; | |
| 897 #endif /*JVMTI_TRACE */ | |
| 898 tty->print("%s(%c ", name, thread->is_being_ext_suspended() ? 'S' : '_'); | |
| 899 if (!thread->has_last_Java_frame()) { | |
| 900 tty->print("no stack"); | |
| 901 } | |
| 902 tty->print(") "); | |
| 903 } | |
| 904 tty->print_cr("]"); | |
| 905 #endif | |
| 906 } | |
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907 |
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908 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_load_event( |
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909 nmethod* nm) { |
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910 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_LOAD); |
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911 event._event_data.compiled_method_load = nm; |
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912 // Keep the nmethod alive until the ServiceThread can process |
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913 // this deferred event. |
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914 nmethodLocker::lock_nmethod(nm); |
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915 return event; |
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916 } |
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917 |
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918 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_unload_event( |
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919 nmethod* nm, jmethodID id, const void* code) { |
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920 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_UNLOAD); |
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921 event._event_data.compiled_method_unload.nm = nm; |
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922 event._event_data.compiled_method_unload.method_id = id; |
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923 event._event_data.compiled_method_unload.code_begin = code; |
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924 // Keep the nmethod alive until the ServiceThread can process |
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925 // this deferred event. This will keep the memory for the |
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926 // generated code from being reused too early. We pass |
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927 // zombie_ok == true here so that our nmethod that was just |
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928 // made into a zombie can be locked. |
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929 nmethodLocker::lock_nmethod(nm, true /* zombie_ok */); |
|
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930 return event; |
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931 } |
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932 |
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933 JvmtiDeferredEvent JvmtiDeferredEvent::dynamic_code_generated_event( |
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934 const char* name, const void* code_begin, const void* code_end) { |
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935 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_DYNAMIC_CODE_GENERATED); |
|
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936 // Need to make a copy of the name since we don't know how long |
|
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937 // the event poster will keep it around after we enqueue the |
|
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938 // deferred event and return. strdup() failure is handled in |
|
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939 // the post() routine below. |
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940 event._event_data.dynamic_code_generated.name = os::strdup(name); |
|
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941 event._event_data.dynamic_code_generated.code_begin = code_begin; |
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942 event._event_data.dynamic_code_generated.code_end = code_end; |
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943 return event; |
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944 } |
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945 |
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946 void JvmtiDeferredEvent::post() { |
|
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947 assert(ServiceThread::is_service_thread(Thread::current()), |
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948 "Service thread must post enqueued events"); |
|
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949 switch(_type) { |
|
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950 case TYPE_COMPILED_METHOD_LOAD: { |
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951 nmethod* nm = _event_data.compiled_method_load; |
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952 JvmtiExport::post_compiled_method_load(nm); |
|
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953 // done with the deferred event so unlock the nmethod |
|
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954 nmethodLocker::unlock_nmethod(nm); |
|
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955 break; |
|
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956 } |
|
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957 case TYPE_COMPILED_METHOD_UNLOAD: { |
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958 nmethod* nm = _event_data.compiled_method_unload.nm; |
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959 JvmtiExport::post_compiled_method_unload( |
|
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960 _event_data.compiled_method_unload.method_id, |
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961 _event_data.compiled_method_unload.code_begin); |
|
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962 // done with the deferred event so unlock the nmethod |
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963 nmethodLocker::unlock_nmethod(nm); |
|
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964 break; |
|
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965 } |
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966 case TYPE_DYNAMIC_CODE_GENERATED: { |
|
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967 JvmtiExport::post_dynamic_code_generated_internal( |
|
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968 // if strdup failed give the event a default name |
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969 (_event_data.dynamic_code_generated.name == NULL) |
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970 ? "unknown_code" : _event_data.dynamic_code_generated.name, |
|
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971 _event_data.dynamic_code_generated.code_begin, |
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972 _event_data.dynamic_code_generated.code_end); |
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973 if (_event_data.dynamic_code_generated.name != NULL) { |
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|
974 // release our copy |
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975 os::free((void *)_event_data.dynamic_code_generated.name); |
|
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976 } |
|
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|
977 break; |
|
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|
978 } |
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979 default: |
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980 ShouldNotReachHere(); |
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981 } |
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|
982 } |
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983 |
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984 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_tail = NULL; |
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985 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_head = NULL; |
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986 |
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987 volatile JvmtiDeferredEventQueue::QueueNode* |
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988 JvmtiDeferredEventQueue::_pending_list = NULL; |
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|
989 |
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990 bool JvmtiDeferredEventQueue::has_events() { |
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991 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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992 return _queue_head != NULL || _pending_list != NULL; |
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|
993 } |
|
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|
994 |
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995 void JvmtiDeferredEventQueue::enqueue(const JvmtiDeferredEvent& event) { |
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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 // Events get added to the end of the queue (and are pulled off the front). |
|
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1001 QueueNode* node = new QueueNode(event); |
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1002 if (_queue_tail == NULL) { |
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1003 _queue_tail = _queue_head = node; |
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1004 } else { |
|
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1005 assert(_queue_tail->next() == NULL, "Must be the last element in the list"); |
|
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1006 _queue_tail->set_next(node); |
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1007 _queue_tail = node; |
|
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1008 } |
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1009 |
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1010 Service_lock->notify_all(); |
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1011 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1012 "Inconsistent queue markers"); |
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1013 } |
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1014 |
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1015 JvmtiDeferredEvent JvmtiDeferredEventQueue::dequeue() { |
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1016 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1017 |
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1018 process_pending_events(); |
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1019 |
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1020 assert(_queue_head != NULL, "Nothing to dequeue"); |
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1021 |
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1022 if (_queue_head == NULL) { |
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1023 // Just in case this happens in product; it shouldn't but let's not crash |
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1024 return JvmtiDeferredEvent(); |
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1025 } |
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1026 |
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1027 QueueNode* node = _queue_head; |
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1028 _queue_head = _queue_head->next(); |
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1029 if (_queue_head == NULL) { |
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1030 _queue_tail = NULL; |
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1031 } |
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1032 |
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1033 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1034 "Inconsistent queue markers"); |
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1035 |
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1036 JvmtiDeferredEvent event = node->event(); |
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1037 delete node; |
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1038 return event; |
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1039 } |
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1040 |
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1041 void JvmtiDeferredEventQueue::add_pending_event( |
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1042 const JvmtiDeferredEvent& event) { |
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1043 |
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1044 QueueNode* node = new QueueNode(event); |
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1045 |
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1046 bool success = false; |
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1047 QueueNode* prev_value = (QueueNode*)_pending_list; |
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1048 do { |
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1049 node->set_next(prev_value); |
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1050 prev_value = (QueueNode*)Atomic::cmpxchg_ptr( |
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1051 (void*)node, (volatile void*)&_pending_list, (void*)node->next()); |
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1052 } while (prev_value != node->next()); |
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1053 } |
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1054 |
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1055 // This method transfers any events that were added by someone NOT holding |
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1056 // the lock into the mainline queue. |
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1057 void JvmtiDeferredEventQueue::process_pending_events() { |
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1058 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1059 |
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1060 if (_pending_list != NULL) { |
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1061 QueueNode* head = |
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1062 (QueueNode*)Atomic::xchg_ptr(NULL, (volatile void*)&_pending_list); |
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1063 |
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1064 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1065 "Inconsistent queue markers"); |
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1066 |
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1067 if (head != NULL) { |
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1068 // Since we've treated the pending list as a stack (with newer |
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1069 // events at the beginning), we need to join the bottom of the stack |
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1070 // with the 'tail' of the queue in order to get the events in the |
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1071 // right order. We do this by reversing the pending list and appending |
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1072 // it to the queue. |
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1073 |
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1074 QueueNode* new_tail = head; |
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1075 QueueNode* new_head = NULL; |
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1076 |
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1077 // This reverses the list |
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1078 QueueNode* prev = new_tail; |
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1079 QueueNode* node = new_tail->next(); |
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1080 new_tail->set_next(NULL); |
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1081 while (node != NULL) { |
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1082 QueueNode* next = node->next(); |
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1083 node->set_next(prev); |
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1084 prev = node; |
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1085 node = next; |
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1086 } |
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1087 new_head = prev; |
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1088 |
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1089 // Now append the new list to the queue |
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1090 if (_queue_tail != NULL) { |
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1091 _queue_tail->set_next(new_head); |
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1092 } else { // _queue_head == NULL |
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1093 _queue_head = new_head; |
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1094 } |
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1095 _queue_tail = new_tail; |
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1096 } |
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1097 } |
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1098 } |