Wed, 08 Oct 2008 08:10:51 -0700
6755845: JVM_FindClassFromBoot triggers assertions
Summary: Fixes assertions caused by one jvm_entry calling another, solved by refactoring code and modified gamma test.
Reviewed-by: dholmes, xlu
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 2003-2007 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | # include "incls/_precompiled.incl" |
duke@435 | 26 | # include "incls/_jvmtiImpl.cpp.incl" |
duke@435 | 27 | |
duke@435 | 28 | GrowableArray<JvmtiRawMonitor*> *JvmtiPendingMonitors::_monitors = new (ResourceObj::C_HEAP) GrowableArray<JvmtiRawMonitor*>(1,true); |
duke@435 | 29 | |
duke@435 | 30 | void JvmtiPendingMonitors::transition_raw_monitors() { |
duke@435 | 31 | assert((Threads::number_of_threads()==1), |
duke@435 | 32 | "Java thread has not created yet or more than one java thread \ |
duke@435 | 33 | is running. Raw monitor transition will not work"); |
duke@435 | 34 | JavaThread *current_java_thread = JavaThread::current(); |
duke@435 | 35 | assert(current_java_thread->thread_state() == _thread_in_vm, "Must be in vm"); |
duke@435 | 36 | { |
duke@435 | 37 | ThreadBlockInVM __tbivm(current_java_thread); |
duke@435 | 38 | for(int i=0; i< count(); i++) { |
duke@435 | 39 | JvmtiRawMonitor *rmonitor = monitors()->at(i); |
duke@435 | 40 | int r = rmonitor->raw_enter(current_java_thread); |
duke@435 | 41 | assert(r == ObjectMonitor::OM_OK, "raw_enter should have worked"); |
duke@435 | 42 | } |
duke@435 | 43 | } |
duke@435 | 44 | // pending monitors are converted to real monitor so delete them all. |
duke@435 | 45 | dispose(); |
duke@435 | 46 | } |
duke@435 | 47 | |
duke@435 | 48 | // |
duke@435 | 49 | // class JvmtiAgentThread |
duke@435 | 50 | // |
duke@435 | 51 | // JavaThread used to wrap a thread started by an agent |
duke@435 | 52 | // using the JVMTI method RunAgentThread. |
duke@435 | 53 | // |
duke@435 | 54 | |
duke@435 | 55 | JvmtiAgentThread::JvmtiAgentThread(JvmtiEnv* env, jvmtiStartFunction start_fn, const void *start_arg) |
duke@435 | 56 | : JavaThread(start_function_wrapper) { |
duke@435 | 57 | _env = env; |
duke@435 | 58 | _start_fn = start_fn; |
duke@435 | 59 | _start_arg = start_arg; |
duke@435 | 60 | } |
duke@435 | 61 | |
duke@435 | 62 | void |
duke@435 | 63 | JvmtiAgentThread::start_function_wrapper(JavaThread *thread, TRAPS) { |
duke@435 | 64 | // It is expected that any Agent threads will be created as |
duke@435 | 65 | // Java Threads. If this is the case, notification of the creation |
duke@435 | 66 | // of the thread is given in JavaThread::thread_main(). |
duke@435 | 67 | assert(thread->is_Java_thread(), "debugger thread should be a Java Thread"); |
duke@435 | 68 | assert(thread == JavaThread::current(), "sanity check"); |
duke@435 | 69 | |
duke@435 | 70 | JvmtiAgentThread *dthread = (JvmtiAgentThread *)thread; |
duke@435 | 71 | dthread->call_start_function(); |
duke@435 | 72 | } |
duke@435 | 73 | |
duke@435 | 74 | void |
duke@435 | 75 | JvmtiAgentThread::call_start_function() { |
duke@435 | 76 | ThreadToNativeFromVM transition(this); |
duke@435 | 77 | _start_fn(_env->jvmti_external(), jni_environment(), (void*)_start_arg); |
duke@435 | 78 | } |
duke@435 | 79 | |
duke@435 | 80 | |
duke@435 | 81 | // |
duke@435 | 82 | // class GrowableCache - private methods |
duke@435 | 83 | // |
duke@435 | 84 | |
duke@435 | 85 | void GrowableCache::recache() { |
duke@435 | 86 | int len = _elements->length(); |
duke@435 | 87 | |
duke@435 | 88 | FREE_C_HEAP_ARRAY(address, _cache); |
duke@435 | 89 | _cache = NEW_C_HEAP_ARRAY(address,len+1); |
duke@435 | 90 | |
duke@435 | 91 | for (int i=0; i<len; i++) { |
duke@435 | 92 | _cache[i] = _elements->at(i)->getCacheValue(); |
duke@435 | 93 | // |
duke@435 | 94 | // The cache entry has gone bad. Without a valid frame pointer |
duke@435 | 95 | // value, the entry is useless so we simply delete it in product |
duke@435 | 96 | // mode. The call to remove() will rebuild the cache again |
duke@435 | 97 | // without the bad entry. |
duke@435 | 98 | // |
duke@435 | 99 | if (_cache[i] == NULL) { |
duke@435 | 100 | assert(false, "cannot recache NULL elements"); |
duke@435 | 101 | remove(i); |
duke@435 | 102 | return; |
duke@435 | 103 | } |
duke@435 | 104 | } |
duke@435 | 105 | _cache[len] = NULL; |
duke@435 | 106 | |
duke@435 | 107 | _listener_fun(_this_obj,_cache); |
duke@435 | 108 | } |
duke@435 | 109 | |
duke@435 | 110 | bool GrowableCache::equals(void* v, GrowableElement *e2) { |
duke@435 | 111 | GrowableElement *e1 = (GrowableElement *) v; |
duke@435 | 112 | assert(e1 != NULL, "e1 != NULL"); |
duke@435 | 113 | assert(e2 != NULL, "e2 != NULL"); |
duke@435 | 114 | |
duke@435 | 115 | return e1->equals(e2); |
duke@435 | 116 | } |
duke@435 | 117 | |
duke@435 | 118 | // |
duke@435 | 119 | // class GrowableCache - public methods |
duke@435 | 120 | // |
duke@435 | 121 | |
duke@435 | 122 | GrowableCache::GrowableCache() { |
duke@435 | 123 | _this_obj = NULL; |
duke@435 | 124 | _listener_fun = NULL; |
duke@435 | 125 | _elements = NULL; |
duke@435 | 126 | _cache = NULL; |
duke@435 | 127 | } |
duke@435 | 128 | |
duke@435 | 129 | GrowableCache::~GrowableCache() { |
duke@435 | 130 | clear(); |
duke@435 | 131 | delete _elements; |
duke@435 | 132 | FREE_C_HEAP_ARRAY(address, _cache); |
duke@435 | 133 | } |
duke@435 | 134 | |
duke@435 | 135 | void GrowableCache::initialize(void *this_obj, void listener_fun(void *, address*) ) { |
duke@435 | 136 | _this_obj = this_obj; |
duke@435 | 137 | _listener_fun = listener_fun; |
duke@435 | 138 | _elements = new (ResourceObj::C_HEAP) GrowableArray<GrowableElement*>(5,true); |
duke@435 | 139 | recache(); |
duke@435 | 140 | } |
duke@435 | 141 | |
duke@435 | 142 | // number of elements in the collection |
duke@435 | 143 | int GrowableCache::length() { |
duke@435 | 144 | return _elements->length(); |
duke@435 | 145 | } |
duke@435 | 146 | |
duke@435 | 147 | // get the value of the index element in the collection |
duke@435 | 148 | GrowableElement* GrowableCache::at(int index) { |
duke@435 | 149 | GrowableElement *e = (GrowableElement *) _elements->at(index); |
duke@435 | 150 | assert(e != NULL, "e != NULL"); |
duke@435 | 151 | return e; |
duke@435 | 152 | } |
duke@435 | 153 | |
duke@435 | 154 | int GrowableCache::find(GrowableElement* e) { |
duke@435 | 155 | return _elements->find(e, GrowableCache::equals); |
duke@435 | 156 | } |
duke@435 | 157 | |
duke@435 | 158 | // append a copy of the element to the end of the collection |
duke@435 | 159 | void GrowableCache::append(GrowableElement* e) { |
duke@435 | 160 | GrowableElement *new_e = e->clone(); |
duke@435 | 161 | _elements->append(new_e); |
duke@435 | 162 | recache(); |
duke@435 | 163 | } |
duke@435 | 164 | |
duke@435 | 165 | // insert a copy of the element using lessthan() |
duke@435 | 166 | void GrowableCache::insert(GrowableElement* e) { |
duke@435 | 167 | GrowableElement *new_e = e->clone(); |
duke@435 | 168 | _elements->append(new_e); |
duke@435 | 169 | |
duke@435 | 170 | int n = length()-2; |
duke@435 | 171 | for (int i=n; i>=0; i--) { |
duke@435 | 172 | GrowableElement *e1 = _elements->at(i); |
duke@435 | 173 | GrowableElement *e2 = _elements->at(i+1); |
duke@435 | 174 | if (e2->lessThan(e1)) { |
duke@435 | 175 | _elements->at_put(i+1, e1); |
duke@435 | 176 | _elements->at_put(i, e2); |
duke@435 | 177 | } |
duke@435 | 178 | } |
duke@435 | 179 | |
duke@435 | 180 | recache(); |
duke@435 | 181 | } |
duke@435 | 182 | |
duke@435 | 183 | // remove the element at index |
duke@435 | 184 | void GrowableCache::remove (int index) { |
duke@435 | 185 | GrowableElement *e = _elements->at(index); |
duke@435 | 186 | assert(e != NULL, "e != NULL"); |
duke@435 | 187 | _elements->remove(e); |
duke@435 | 188 | delete e; |
duke@435 | 189 | recache(); |
duke@435 | 190 | } |
duke@435 | 191 | |
duke@435 | 192 | // clear out all elements, release all heap space and |
duke@435 | 193 | // let our listener know that things have changed. |
duke@435 | 194 | void GrowableCache::clear() { |
duke@435 | 195 | int len = _elements->length(); |
duke@435 | 196 | for (int i=0; i<len; i++) { |
duke@435 | 197 | delete _elements->at(i); |
duke@435 | 198 | } |
duke@435 | 199 | _elements->clear(); |
duke@435 | 200 | recache(); |
duke@435 | 201 | } |
duke@435 | 202 | |
duke@435 | 203 | void GrowableCache::oops_do(OopClosure* f) { |
duke@435 | 204 | int len = _elements->length(); |
duke@435 | 205 | for (int i=0; i<len; i++) { |
duke@435 | 206 | GrowableElement *e = _elements->at(i); |
duke@435 | 207 | e->oops_do(f); |
duke@435 | 208 | } |
duke@435 | 209 | } |
duke@435 | 210 | |
duke@435 | 211 | void GrowableCache::gc_epilogue() { |
duke@435 | 212 | int len = _elements->length(); |
duke@435 | 213 | // recompute the new cache value after GC |
duke@435 | 214 | for (int i=0; i<len; i++) { |
duke@435 | 215 | _cache[i] = _elements->at(i)->getCacheValue(); |
duke@435 | 216 | } |
duke@435 | 217 | } |
duke@435 | 218 | |
duke@435 | 219 | |
duke@435 | 220 | // |
duke@435 | 221 | // class JvmtiRawMonitor |
duke@435 | 222 | // |
duke@435 | 223 | |
duke@435 | 224 | JvmtiRawMonitor::JvmtiRawMonitor(const char *name) { |
duke@435 | 225 | #ifdef ASSERT |
duke@435 | 226 | _name = strcpy(NEW_C_HEAP_ARRAY(char, strlen(name) + 1), name); |
duke@435 | 227 | #else |
duke@435 | 228 | _name = NULL; |
duke@435 | 229 | #endif |
duke@435 | 230 | _magic = JVMTI_RM_MAGIC; |
duke@435 | 231 | } |
duke@435 | 232 | |
duke@435 | 233 | JvmtiRawMonitor::~JvmtiRawMonitor() { |
duke@435 | 234 | #ifdef ASSERT |
duke@435 | 235 | FreeHeap(_name); |
duke@435 | 236 | #endif |
duke@435 | 237 | _magic = 0; |
duke@435 | 238 | } |
duke@435 | 239 | |
duke@435 | 240 | |
duke@435 | 241 | // |
duke@435 | 242 | // class JvmtiBreakpoint |
duke@435 | 243 | // |
duke@435 | 244 | |
duke@435 | 245 | JvmtiBreakpoint::JvmtiBreakpoint() { |
duke@435 | 246 | _method = NULL; |
duke@435 | 247 | _bci = 0; |
duke@435 | 248 | #ifdef CHECK_UNHANDLED_OOPS |
duke@435 | 249 | // This one is always allocated with new, but check it just in case. |
duke@435 | 250 | Thread *thread = Thread::current(); |
duke@435 | 251 | if (thread->is_in_stack((address)&_method)) { |
duke@435 | 252 | thread->allow_unhandled_oop((oop*)&_method); |
duke@435 | 253 | } |
duke@435 | 254 | #endif // CHECK_UNHANDLED_OOPS |
duke@435 | 255 | } |
duke@435 | 256 | |
duke@435 | 257 | JvmtiBreakpoint::JvmtiBreakpoint(methodOop m_method, jlocation location) { |
duke@435 | 258 | _method = m_method; |
duke@435 | 259 | assert(_method != NULL, "_method != NULL"); |
duke@435 | 260 | _bci = (int) location; |
duke@435 | 261 | #ifdef CHECK_UNHANDLED_OOPS |
duke@435 | 262 | // Could be allocated with new and wouldn't be on the unhandled oop list. |
duke@435 | 263 | Thread *thread = Thread::current(); |
duke@435 | 264 | if (thread->is_in_stack((address)&_method)) { |
duke@435 | 265 | thread->allow_unhandled_oop(&_method); |
duke@435 | 266 | } |
duke@435 | 267 | #endif // CHECK_UNHANDLED_OOPS |
duke@435 | 268 | |
duke@435 | 269 | assert(_bci >= 0, "_bci >= 0"); |
duke@435 | 270 | } |
duke@435 | 271 | |
duke@435 | 272 | void JvmtiBreakpoint::copy(JvmtiBreakpoint& bp) { |
duke@435 | 273 | _method = bp._method; |
duke@435 | 274 | _bci = bp._bci; |
duke@435 | 275 | } |
duke@435 | 276 | |
duke@435 | 277 | bool JvmtiBreakpoint::lessThan(JvmtiBreakpoint& bp) { |
duke@435 | 278 | Unimplemented(); |
duke@435 | 279 | return false; |
duke@435 | 280 | } |
duke@435 | 281 | |
duke@435 | 282 | bool JvmtiBreakpoint::equals(JvmtiBreakpoint& bp) { |
duke@435 | 283 | return _method == bp._method |
duke@435 | 284 | && _bci == bp._bci; |
duke@435 | 285 | } |
duke@435 | 286 | |
duke@435 | 287 | bool JvmtiBreakpoint::is_valid() { |
duke@435 | 288 | return _method != NULL && |
duke@435 | 289 | _bci >= 0; |
duke@435 | 290 | } |
duke@435 | 291 | |
duke@435 | 292 | address JvmtiBreakpoint::getBcp() { |
duke@435 | 293 | return _method->bcp_from(_bci); |
duke@435 | 294 | } |
duke@435 | 295 | |
duke@435 | 296 | void JvmtiBreakpoint::each_method_version_do(method_action meth_act) { |
duke@435 | 297 | ((methodOopDesc*)_method->*meth_act)(_bci); |
duke@435 | 298 | |
duke@435 | 299 | // add/remove breakpoint to/from versions of the method that |
duke@435 | 300 | // are EMCP. Directly or transitively obsolete methods are |
duke@435 | 301 | // not saved in the PreviousVersionInfo. |
duke@435 | 302 | Thread *thread = Thread::current(); |
duke@435 | 303 | instanceKlassHandle ikh = instanceKlassHandle(thread, _method->method_holder()); |
duke@435 | 304 | symbolOop m_name = _method->name(); |
duke@435 | 305 | symbolOop m_signature = _method->signature(); |
duke@435 | 306 | |
duke@435 | 307 | { |
duke@435 | 308 | ResourceMark rm(thread); |
duke@435 | 309 | // PreviousVersionInfo objects returned via PreviousVersionWalker |
duke@435 | 310 | // contain a GrowableArray of handles. We have to clean up the |
duke@435 | 311 | // GrowableArray _after_ the PreviousVersionWalker destructor |
duke@435 | 312 | // has destroyed the handles. |
duke@435 | 313 | { |
duke@435 | 314 | // search previous versions if they exist |
duke@435 | 315 | PreviousVersionWalker pvw((instanceKlass *)ikh()->klass_part()); |
duke@435 | 316 | for (PreviousVersionInfo * pv_info = pvw.next_previous_version(); |
duke@435 | 317 | pv_info != NULL; pv_info = pvw.next_previous_version()) { |
duke@435 | 318 | GrowableArray<methodHandle>* methods = |
duke@435 | 319 | pv_info->prev_EMCP_method_handles(); |
duke@435 | 320 | |
duke@435 | 321 | if (methods == NULL) { |
duke@435 | 322 | // We have run into a PreviousVersion generation where |
duke@435 | 323 | // all methods were made obsolete during that generation's |
duke@435 | 324 | // RedefineClasses() operation. At the time of that |
duke@435 | 325 | // operation, all EMCP methods were flushed so we don't |
duke@435 | 326 | // have to go back any further. |
duke@435 | 327 | // |
duke@435 | 328 | // A NULL methods array is different than an empty methods |
duke@435 | 329 | // array. We cannot infer any optimizations about older |
duke@435 | 330 | // generations from an empty methods array for the current |
duke@435 | 331 | // generation. |
duke@435 | 332 | break; |
duke@435 | 333 | } |
duke@435 | 334 | |
duke@435 | 335 | for (int i = methods->length() - 1; i >= 0; i--) { |
duke@435 | 336 | methodHandle method = methods->at(i); |
duke@435 | 337 | if (method->name() == m_name && method->signature() == m_signature) { |
duke@435 | 338 | RC_TRACE(0x00000800, ("%sing breakpoint in %s(%s)", |
duke@435 | 339 | meth_act == &methodOopDesc::set_breakpoint ? "sett" : "clear", |
duke@435 | 340 | method->name()->as_C_string(), |
duke@435 | 341 | method->signature()->as_C_string())); |
duke@435 | 342 | assert(!method->is_obsolete(), "only EMCP methods here"); |
duke@435 | 343 | |
duke@435 | 344 | ((methodOopDesc*)method()->*meth_act)(_bci); |
duke@435 | 345 | break; |
duke@435 | 346 | } |
duke@435 | 347 | } |
duke@435 | 348 | } |
duke@435 | 349 | } // pvw is cleaned up |
duke@435 | 350 | } // rm is cleaned up |
duke@435 | 351 | } |
duke@435 | 352 | |
duke@435 | 353 | void JvmtiBreakpoint::set() { |
duke@435 | 354 | each_method_version_do(&methodOopDesc::set_breakpoint); |
duke@435 | 355 | } |
duke@435 | 356 | |
duke@435 | 357 | void JvmtiBreakpoint::clear() { |
duke@435 | 358 | each_method_version_do(&methodOopDesc::clear_breakpoint); |
duke@435 | 359 | } |
duke@435 | 360 | |
duke@435 | 361 | void JvmtiBreakpoint::print() { |
duke@435 | 362 | #ifndef PRODUCT |
duke@435 | 363 | const char *class_name = (_method == NULL) ? "NULL" : _method->klass_name()->as_C_string(); |
duke@435 | 364 | const char *method_name = (_method == NULL) ? "NULL" : _method->name()->as_C_string(); |
duke@435 | 365 | |
duke@435 | 366 | tty->print("Breakpoint(%s,%s,%d,%p)",class_name, method_name, _bci, getBcp()); |
duke@435 | 367 | #endif |
duke@435 | 368 | } |
duke@435 | 369 | |
duke@435 | 370 | |
duke@435 | 371 | // |
duke@435 | 372 | // class VM_ChangeBreakpoints |
duke@435 | 373 | // |
duke@435 | 374 | // Modify the Breakpoints data structure at a safepoint |
duke@435 | 375 | // |
duke@435 | 376 | |
duke@435 | 377 | void VM_ChangeBreakpoints::doit() { |
duke@435 | 378 | switch (_operation) { |
duke@435 | 379 | case SET_BREAKPOINT: |
duke@435 | 380 | _breakpoints->set_at_safepoint(*_bp); |
duke@435 | 381 | break; |
duke@435 | 382 | case CLEAR_BREAKPOINT: |
duke@435 | 383 | _breakpoints->clear_at_safepoint(*_bp); |
duke@435 | 384 | break; |
duke@435 | 385 | case CLEAR_ALL_BREAKPOINT: |
duke@435 | 386 | _breakpoints->clearall_at_safepoint(); |
duke@435 | 387 | break; |
duke@435 | 388 | default: |
duke@435 | 389 | assert(false, "Unknown operation"); |
duke@435 | 390 | } |
duke@435 | 391 | } |
duke@435 | 392 | |
duke@435 | 393 | void VM_ChangeBreakpoints::oops_do(OopClosure* f) { |
duke@435 | 394 | // This operation keeps breakpoints alive |
duke@435 | 395 | if (_breakpoints != NULL) { |
duke@435 | 396 | _breakpoints->oops_do(f); |
duke@435 | 397 | } |
duke@435 | 398 | if (_bp != NULL) { |
duke@435 | 399 | _bp->oops_do(f); |
duke@435 | 400 | } |
duke@435 | 401 | } |
duke@435 | 402 | |
duke@435 | 403 | // |
duke@435 | 404 | // class JvmtiBreakpoints |
duke@435 | 405 | // |
duke@435 | 406 | // a JVMTI internal collection of JvmtiBreakpoint |
duke@435 | 407 | // |
duke@435 | 408 | |
duke@435 | 409 | JvmtiBreakpoints::JvmtiBreakpoints(void listener_fun(void *,address *)) { |
duke@435 | 410 | _bps.initialize(this,listener_fun); |
duke@435 | 411 | } |
duke@435 | 412 | |
duke@435 | 413 | JvmtiBreakpoints:: ~JvmtiBreakpoints() {} |
duke@435 | 414 | |
duke@435 | 415 | void JvmtiBreakpoints::oops_do(OopClosure* f) { |
duke@435 | 416 | _bps.oops_do(f); |
duke@435 | 417 | } |
duke@435 | 418 | |
duke@435 | 419 | void JvmtiBreakpoints::gc_epilogue() { |
duke@435 | 420 | _bps.gc_epilogue(); |
duke@435 | 421 | } |
duke@435 | 422 | |
duke@435 | 423 | void JvmtiBreakpoints::print() { |
duke@435 | 424 | #ifndef PRODUCT |
duke@435 | 425 | ResourceMark rm; |
duke@435 | 426 | |
duke@435 | 427 | int n = _bps.length(); |
duke@435 | 428 | for (int i=0; i<n; i++) { |
duke@435 | 429 | JvmtiBreakpoint& bp = _bps.at(i); |
duke@435 | 430 | tty->print("%d: ", i); |
duke@435 | 431 | bp.print(); |
duke@435 | 432 | tty->print_cr(""); |
duke@435 | 433 | } |
duke@435 | 434 | #endif |
duke@435 | 435 | } |
duke@435 | 436 | |
duke@435 | 437 | |
duke@435 | 438 | void JvmtiBreakpoints::set_at_safepoint(JvmtiBreakpoint& bp) { |
duke@435 | 439 | assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
duke@435 | 440 | |
duke@435 | 441 | int i = _bps.find(bp); |
duke@435 | 442 | if (i == -1) { |
duke@435 | 443 | _bps.append(bp); |
duke@435 | 444 | bp.set(); |
duke@435 | 445 | } |
duke@435 | 446 | } |
duke@435 | 447 | |
duke@435 | 448 | void JvmtiBreakpoints::clear_at_safepoint(JvmtiBreakpoint& bp) { |
duke@435 | 449 | assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
duke@435 | 450 | |
duke@435 | 451 | int i = _bps.find(bp); |
duke@435 | 452 | if (i != -1) { |
duke@435 | 453 | _bps.remove(i); |
duke@435 | 454 | bp.clear(); |
duke@435 | 455 | } |
duke@435 | 456 | } |
duke@435 | 457 | |
duke@435 | 458 | void JvmtiBreakpoints::clearall_at_safepoint() { |
duke@435 | 459 | assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
duke@435 | 460 | |
duke@435 | 461 | int len = _bps.length(); |
duke@435 | 462 | for (int i=0; i<len; i++) { |
duke@435 | 463 | _bps.at(i).clear(); |
duke@435 | 464 | } |
duke@435 | 465 | _bps.clear(); |
duke@435 | 466 | } |
duke@435 | 467 | |
duke@435 | 468 | int JvmtiBreakpoints::length() { return _bps.length(); } |
duke@435 | 469 | |
duke@435 | 470 | int JvmtiBreakpoints::set(JvmtiBreakpoint& bp) { |
duke@435 | 471 | if ( _bps.find(bp) != -1) { |
duke@435 | 472 | return JVMTI_ERROR_DUPLICATE; |
duke@435 | 473 | } |
duke@435 | 474 | VM_ChangeBreakpoints set_breakpoint(this,VM_ChangeBreakpoints::SET_BREAKPOINT, &bp); |
duke@435 | 475 | VMThread::execute(&set_breakpoint); |
duke@435 | 476 | return JVMTI_ERROR_NONE; |
duke@435 | 477 | } |
duke@435 | 478 | |
duke@435 | 479 | int JvmtiBreakpoints::clear(JvmtiBreakpoint& bp) { |
duke@435 | 480 | if ( _bps.find(bp) == -1) { |
duke@435 | 481 | return JVMTI_ERROR_NOT_FOUND; |
duke@435 | 482 | } |
duke@435 | 483 | |
duke@435 | 484 | VM_ChangeBreakpoints clear_breakpoint(this,VM_ChangeBreakpoints::CLEAR_BREAKPOINT, &bp); |
duke@435 | 485 | VMThread::execute(&clear_breakpoint); |
duke@435 | 486 | return JVMTI_ERROR_NONE; |
duke@435 | 487 | } |
duke@435 | 488 | |
duke@435 | 489 | void JvmtiBreakpoints::clearall_in_class_at_safepoint(klassOop klass) { |
duke@435 | 490 | bool changed = true; |
duke@435 | 491 | // We are going to run thru the list of bkpts |
duke@435 | 492 | // and delete some. This deletion probably alters |
duke@435 | 493 | // the list in some implementation defined way such |
duke@435 | 494 | // that when we delete entry i, the next entry might |
duke@435 | 495 | // no longer be at i+1. To be safe, each time we delete |
duke@435 | 496 | // an entry, we'll just start again from the beginning. |
duke@435 | 497 | // We'll stop when we make a pass thru the whole list without |
duke@435 | 498 | // deleting anything. |
duke@435 | 499 | while (changed) { |
duke@435 | 500 | int len = _bps.length(); |
duke@435 | 501 | changed = false; |
duke@435 | 502 | for (int i = 0; i < len; i++) { |
duke@435 | 503 | JvmtiBreakpoint& bp = _bps.at(i); |
duke@435 | 504 | if (bp.method()->method_holder() == klass) { |
duke@435 | 505 | bp.clear(); |
duke@435 | 506 | _bps.remove(i); |
duke@435 | 507 | // This changed 'i' so we have to start over. |
duke@435 | 508 | changed = true; |
duke@435 | 509 | break; |
duke@435 | 510 | } |
duke@435 | 511 | } |
duke@435 | 512 | } |
duke@435 | 513 | } |
duke@435 | 514 | |
duke@435 | 515 | void JvmtiBreakpoints::clearall() { |
duke@435 | 516 | VM_ChangeBreakpoints clearall_breakpoint(this,VM_ChangeBreakpoints::CLEAR_ALL_BREAKPOINT); |
duke@435 | 517 | VMThread::execute(&clearall_breakpoint); |
duke@435 | 518 | } |
duke@435 | 519 | |
duke@435 | 520 | // |
duke@435 | 521 | // class JvmtiCurrentBreakpoints |
duke@435 | 522 | // |
duke@435 | 523 | |
duke@435 | 524 | JvmtiBreakpoints *JvmtiCurrentBreakpoints::_jvmti_breakpoints = NULL; |
duke@435 | 525 | address * JvmtiCurrentBreakpoints::_breakpoint_list = NULL; |
duke@435 | 526 | |
duke@435 | 527 | |
duke@435 | 528 | JvmtiBreakpoints& JvmtiCurrentBreakpoints::get_jvmti_breakpoints() { |
duke@435 | 529 | if (_jvmti_breakpoints != NULL) return (*_jvmti_breakpoints); |
duke@435 | 530 | _jvmti_breakpoints = new JvmtiBreakpoints(listener_fun); |
duke@435 | 531 | assert(_jvmti_breakpoints != NULL, "_jvmti_breakpoints != NULL"); |
duke@435 | 532 | return (*_jvmti_breakpoints); |
duke@435 | 533 | } |
duke@435 | 534 | |
duke@435 | 535 | void JvmtiCurrentBreakpoints::listener_fun(void *this_obj, address *cache) { |
duke@435 | 536 | JvmtiBreakpoints *this_jvmti = (JvmtiBreakpoints *) this_obj; |
duke@435 | 537 | assert(this_jvmti != NULL, "this_jvmti != NULL"); |
duke@435 | 538 | |
duke@435 | 539 | debug_only(int n = this_jvmti->length();); |
duke@435 | 540 | assert(cache[n] == NULL, "cache must be NULL terminated"); |
duke@435 | 541 | |
duke@435 | 542 | set_breakpoint_list(cache); |
duke@435 | 543 | } |
duke@435 | 544 | |
duke@435 | 545 | |
duke@435 | 546 | void JvmtiCurrentBreakpoints::oops_do(OopClosure* f) { |
duke@435 | 547 | if (_jvmti_breakpoints != NULL) { |
duke@435 | 548 | _jvmti_breakpoints->oops_do(f); |
duke@435 | 549 | } |
duke@435 | 550 | } |
duke@435 | 551 | |
duke@435 | 552 | void JvmtiCurrentBreakpoints::gc_epilogue() { |
duke@435 | 553 | if (_jvmti_breakpoints != NULL) { |
duke@435 | 554 | _jvmti_breakpoints->gc_epilogue(); |
duke@435 | 555 | } |
duke@435 | 556 | } |
duke@435 | 557 | |
duke@435 | 558 | |
duke@435 | 559 | /////////////////////////////////////////////////////////////// |
duke@435 | 560 | // |
duke@435 | 561 | // class VM_GetOrSetLocal |
duke@435 | 562 | // |
duke@435 | 563 | |
duke@435 | 564 | // Constructor for non-object getter |
duke@435 | 565 | VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type) |
duke@435 | 566 | : _thread(thread) |
duke@435 | 567 | , _calling_thread(NULL) |
duke@435 | 568 | , _depth(depth) |
duke@435 | 569 | , _index(index) |
duke@435 | 570 | , _type(type) |
duke@435 | 571 | , _set(false) |
duke@435 | 572 | , _jvf(NULL) |
duke@435 | 573 | , _result(JVMTI_ERROR_NONE) |
duke@435 | 574 | { |
duke@435 | 575 | } |
duke@435 | 576 | |
duke@435 | 577 | // Constructor for object or non-object setter |
duke@435 | 578 | VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type, jvalue value) |
duke@435 | 579 | : _thread(thread) |
duke@435 | 580 | , _calling_thread(NULL) |
duke@435 | 581 | , _depth(depth) |
duke@435 | 582 | , _index(index) |
duke@435 | 583 | , _type(type) |
duke@435 | 584 | , _value(value) |
duke@435 | 585 | , _set(true) |
duke@435 | 586 | , _jvf(NULL) |
duke@435 | 587 | , _result(JVMTI_ERROR_NONE) |
duke@435 | 588 | { |
duke@435 | 589 | } |
duke@435 | 590 | |
duke@435 | 591 | // Constructor for object getter |
duke@435 | 592 | VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, int index) |
duke@435 | 593 | : _thread(thread) |
duke@435 | 594 | , _calling_thread(calling_thread) |
duke@435 | 595 | , _depth(depth) |
duke@435 | 596 | , _index(index) |
duke@435 | 597 | , _type(T_OBJECT) |
duke@435 | 598 | , _set(false) |
duke@435 | 599 | , _jvf(NULL) |
duke@435 | 600 | , _result(JVMTI_ERROR_NONE) |
duke@435 | 601 | { |
duke@435 | 602 | } |
duke@435 | 603 | |
duke@435 | 604 | |
duke@435 | 605 | vframe *VM_GetOrSetLocal::get_vframe() { |
duke@435 | 606 | if (!_thread->has_last_Java_frame()) { |
duke@435 | 607 | return NULL; |
duke@435 | 608 | } |
duke@435 | 609 | RegisterMap reg_map(_thread); |
duke@435 | 610 | vframe *vf = _thread->last_java_vframe(®_map); |
duke@435 | 611 | int d = 0; |
duke@435 | 612 | while ((vf != NULL) && (d < _depth)) { |
duke@435 | 613 | vf = vf->java_sender(); |
duke@435 | 614 | d++; |
duke@435 | 615 | } |
duke@435 | 616 | return vf; |
duke@435 | 617 | } |
duke@435 | 618 | |
duke@435 | 619 | javaVFrame *VM_GetOrSetLocal::get_java_vframe() { |
duke@435 | 620 | vframe* vf = get_vframe(); |
duke@435 | 621 | if (vf == NULL) { |
duke@435 | 622 | _result = JVMTI_ERROR_NO_MORE_FRAMES; |
duke@435 | 623 | return NULL; |
duke@435 | 624 | } |
duke@435 | 625 | javaVFrame *jvf = (javaVFrame*)vf; |
duke@435 | 626 | |
duke@435 | 627 | if (!vf->is_java_frame() || jvf->method()->is_native()) { |
duke@435 | 628 | _result = JVMTI_ERROR_OPAQUE_FRAME; |
duke@435 | 629 | return NULL; |
duke@435 | 630 | } |
duke@435 | 631 | return jvf; |
duke@435 | 632 | } |
duke@435 | 633 | |
duke@435 | 634 | // Check that the klass is assignable to a type with the given signature. |
duke@435 | 635 | // Another solution could be to use the function Klass::is_subtype_of(type). |
duke@435 | 636 | // But the type class can be forced to load/initialize eagerly in such a case. |
duke@435 | 637 | // This may cause unexpected consequences like CFLH or class-init JVMTI events. |
duke@435 | 638 | // It is better to avoid such a behavior. |
duke@435 | 639 | bool VM_GetOrSetLocal::is_assignable(const char* ty_sign, Klass* klass, Thread* thread) { |
duke@435 | 640 | assert(ty_sign != NULL, "type signature must not be NULL"); |
duke@435 | 641 | assert(thread != NULL, "thread must not be NULL"); |
duke@435 | 642 | assert(klass != NULL, "klass must not be NULL"); |
duke@435 | 643 | |
duke@435 | 644 | int len = (int) strlen(ty_sign); |
duke@435 | 645 | if (ty_sign[0] == 'L' && ty_sign[len-1] == ';') { // Need pure class/interface name |
duke@435 | 646 | ty_sign++; |
duke@435 | 647 | len -= 2; |
duke@435 | 648 | } |
duke@435 | 649 | symbolHandle ty_sym = oopFactory::new_symbol_handle(ty_sign, len, thread); |
duke@435 | 650 | if (klass->name() == ty_sym()) { |
duke@435 | 651 | return true; |
duke@435 | 652 | } |
duke@435 | 653 | // Compare primary supers |
duke@435 | 654 | int super_depth = klass->super_depth(); |
duke@435 | 655 | int idx; |
duke@435 | 656 | for (idx = 0; idx < super_depth; idx++) { |
duke@435 | 657 | if (Klass::cast(klass->primary_super_of_depth(idx))->name() == ty_sym()) { |
duke@435 | 658 | return true; |
duke@435 | 659 | } |
duke@435 | 660 | } |
duke@435 | 661 | // Compare secondary supers |
duke@435 | 662 | objArrayOop sec_supers = klass->secondary_supers(); |
duke@435 | 663 | for (idx = 0; idx < sec_supers->length(); idx++) { |
duke@435 | 664 | if (Klass::cast((klassOop) sec_supers->obj_at(idx))->name() == ty_sym()) { |
duke@435 | 665 | return true; |
duke@435 | 666 | } |
duke@435 | 667 | } |
duke@435 | 668 | return false; |
duke@435 | 669 | } |
duke@435 | 670 | |
duke@435 | 671 | // Checks error conditions: |
duke@435 | 672 | // JVMTI_ERROR_INVALID_SLOT |
duke@435 | 673 | // JVMTI_ERROR_TYPE_MISMATCH |
duke@435 | 674 | // Returns: 'true' - everything is Ok, 'false' - error code |
duke@435 | 675 | |
duke@435 | 676 | bool VM_GetOrSetLocal::check_slot_type(javaVFrame* jvf) { |
duke@435 | 677 | methodOop method_oop = jvf->method(); |
duke@435 | 678 | if (!method_oop->has_localvariable_table()) { |
duke@435 | 679 | // Just to check index boundaries |
duke@435 | 680 | jint extra_slot = (_type == T_LONG || _type == T_DOUBLE) ? 1 : 0; |
duke@435 | 681 | if (_index < 0 || _index + extra_slot >= method_oop->max_locals()) { |
duke@435 | 682 | _result = JVMTI_ERROR_INVALID_SLOT; |
duke@435 | 683 | return false; |
duke@435 | 684 | } |
duke@435 | 685 | return true; |
duke@435 | 686 | } |
duke@435 | 687 | |
duke@435 | 688 | jint num_entries = method_oop->localvariable_table_length(); |
duke@435 | 689 | if (num_entries == 0) { |
duke@435 | 690 | _result = JVMTI_ERROR_INVALID_SLOT; |
duke@435 | 691 | return false; // There are no slots |
duke@435 | 692 | } |
duke@435 | 693 | int signature_idx = -1; |
duke@435 | 694 | int vf_bci = jvf->bci(); |
duke@435 | 695 | LocalVariableTableElement* table = method_oop->localvariable_table_start(); |
duke@435 | 696 | for (int i = 0; i < num_entries; i++) { |
duke@435 | 697 | int start_bci = table[i].start_bci; |
duke@435 | 698 | int end_bci = start_bci + table[i].length; |
duke@435 | 699 | |
duke@435 | 700 | // Here we assume that locations of LVT entries |
duke@435 | 701 | // with the same slot number cannot be overlapped |
duke@435 | 702 | if (_index == (jint) table[i].slot && start_bci <= vf_bci && vf_bci <= end_bci) { |
duke@435 | 703 | signature_idx = (int) table[i].descriptor_cp_index; |
duke@435 | 704 | break; |
duke@435 | 705 | } |
duke@435 | 706 | } |
duke@435 | 707 | if (signature_idx == -1) { |
duke@435 | 708 | _result = JVMTI_ERROR_INVALID_SLOT; |
duke@435 | 709 | return false; // Incorrect slot index |
duke@435 | 710 | } |
duke@435 | 711 | symbolOop sign_sym = method_oop->constants()->symbol_at(signature_idx); |
duke@435 | 712 | const char* signature = (const char *) sign_sym->as_utf8(); |
duke@435 | 713 | BasicType slot_type = char2type(signature[0]); |
duke@435 | 714 | |
duke@435 | 715 | switch (slot_type) { |
duke@435 | 716 | case T_BYTE: |
duke@435 | 717 | case T_SHORT: |
duke@435 | 718 | case T_CHAR: |
duke@435 | 719 | case T_BOOLEAN: |
duke@435 | 720 | slot_type = T_INT; |
duke@435 | 721 | break; |
duke@435 | 722 | case T_ARRAY: |
duke@435 | 723 | slot_type = T_OBJECT; |
duke@435 | 724 | break; |
duke@435 | 725 | }; |
duke@435 | 726 | if (_type != slot_type) { |
duke@435 | 727 | _result = JVMTI_ERROR_TYPE_MISMATCH; |
duke@435 | 728 | return false; |
duke@435 | 729 | } |
duke@435 | 730 | |
duke@435 | 731 | jobject jobj = _value.l; |
duke@435 | 732 | if (_set && slot_type == T_OBJECT && jobj != NULL) { // NULL reference is allowed |
duke@435 | 733 | // Check that the jobject class matches the return type signature. |
duke@435 | 734 | JavaThread* cur_thread = JavaThread::current(); |
duke@435 | 735 | HandleMark hm(cur_thread); |
duke@435 | 736 | |
duke@435 | 737 | Handle obj = Handle(cur_thread, JNIHandles::resolve_external_guard(jobj)); |
duke@435 | 738 | NULL_CHECK(obj, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); |
duke@435 | 739 | KlassHandle ob_kh = KlassHandle(cur_thread, obj->klass()); |
duke@435 | 740 | NULL_CHECK(ob_kh, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); |
duke@435 | 741 | |
duke@435 | 742 | if (!is_assignable(signature, Klass::cast(ob_kh()), cur_thread)) { |
duke@435 | 743 | _result = JVMTI_ERROR_TYPE_MISMATCH; |
duke@435 | 744 | return false; |
duke@435 | 745 | } |
duke@435 | 746 | } |
duke@435 | 747 | return true; |
duke@435 | 748 | } |
duke@435 | 749 | |
duke@435 | 750 | static bool can_be_deoptimized(vframe* vf) { |
duke@435 | 751 | return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized()); |
duke@435 | 752 | } |
duke@435 | 753 | |
duke@435 | 754 | bool VM_GetOrSetLocal::doit_prologue() { |
duke@435 | 755 | _jvf = get_java_vframe(); |
duke@435 | 756 | NULL_CHECK(_jvf, false); |
duke@435 | 757 | |
duke@435 | 758 | if (!check_slot_type(_jvf)) { |
duke@435 | 759 | return false; |
duke@435 | 760 | } |
duke@435 | 761 | return true; |
duke@435 | 762 | } |
duke@435 | 763 | |
duke@435 | 764 | void VM_GetOrSetLocal::doit() { |
duke@435 | 765 | if (_set) { |
duke@435 | 766 | // Force deoptimization of frame if compiled because it's |
duke@435 | 767 | // possible the compiler emitted some locals as constant values, |
duke@435 | 768 | // meaning they are not mutable. |
duke@435 | 769 | if (can_be_deoptimized(_jvf)) { |
duke@435 | 770 | |
duke@435 | 771 | // Schedule deoptimization so that eventually the local |
duke@435 | 772 | // update will be written to an interpreter frame. |
duke@435 | 773 | VM_DeoptimizeFrame deopt(_jvf->thread(), _jvf->fr().id()); |
duke@435 | 774 | VMThread::execute(&deopt); |
duke@435 | 775 | |
duke@435 | 776 | // Now store a new value for the local which will be applied |
duke@435 | 777 | // once deoptimization occurs. Note however that while this |
duke@435 | 778 | // write is deferred until deoptimization actually happens |
duke@435 | 779 | // can vframe created after this point will have its locals |
duke@435 | 780 | // reflecting this update so as far as anyone can see the |
duke@435 | 781 | // write has already taken place. |
duke@435 | 782 | |
duke@435 | 783 | // If we are updating an oop then get the oop from the handle |
duke@435 | 784 | // since the handle will be long gone by the time the deopt |
duke@435 | 785 | // happens. The oop stored in the deferred local will be |
duke@435 | 786 | // gc'd on its own. |
duke@435 | 787 | if (_type == T_OBJECT) { |
duke@435 | 788 | _value.l = (jobject) (JNIHandles::resolve_external_guard(_value.l)); |
duke@435 | 789 | } |
duke@435 | 790 | // Re-read the vframe so we can see that it is deoptimized |
duke@435 | 791 | // [ Only need because of assert in update_local() ] |
duke@435 | 792 | _jvf = get_java_vframe(); |
duke@435 | 793 | ((compiledVFrame*)_jvf)->update_local(_type, _index, _value); |
duke@435 | 794 | return; |
duke@435 | 795 | } |
duke@435 | 796 | StackValueCollection *locals = _jvf->locals(); |
duke@435 | 797 | HandleMark hm; |
duke@435 | 798 | |
duke@435 | 799 | switch (_type) { |
duke@435 | 800 | case T_INT: locals->set_int_at (_index, _value.i); break; |
duke@435 | 801 | case T_LONG: locals->set_long_at (_index, _value.j); break; |
duke@435 | 802 | case T_FLOAT: locals->set_float_at (_index, _value.f); break; |
duke@435 | 803 | case T_DOUBLE: locals->set_double_at(_index, _value.d); break; |
duke@435 | 804 | case T_OBJECT: { |
duke@435 | 805 | Handle ob_h(JNIHandles::resolve_external_guard(_value.l)); |
duke@435 | 806 | locals->set_obj_at (_index, ob_h); |
duke@435 | 807 | break; |
duke@435 | 808 | } |
duke@435 | 809 | default: ShouldNotReachHere(); |
duke@435 | 810 | } |
duke@435 | 811 | _jvf->set_locals(locals); |
duke@435 | 812 | } else { |
duke@435 | 813 | StackValueCollection *locals = _jvf->locals(); |
duke@435 | 814 | |
duke@435 | 815 | if (locals->at(_index)->type() == T_CONFLICT) { |
duke@435 | 816 | memset(&_value, 0, sizeof(_value)); |
duke@435 | 817 | _value.l = NULL; |
duke@435 | 818 | return; |
duke@435 | 819 | } |
duke@435 | 820 | |
duke@435 | 821 | switch (_type) { |
duke@435 | 822 | case T_INT: _value.i = locals->int_at (_index); break; |
duke@435 | 823 | case T_LONG: _value.j = locals->long_at (_index); break; |
duke@435 | 824 | case T_FLOAT: _value.f = locals->float_at (_index); break; |
duke@435 | 825 | case T_DOUBLE: _value.d = locals->double_at(_index); break; |
duke@435 | 826 | case T_OBJECT: { |
duke@435 | 827 | // Wrap the oop to be returned in a local JNI handle since |
duke@435 | 828 | // oops_do() no longer applies after doit() is finished. |
duke@435 | 829 | oop obj = locals->obj_at(_index)(); |
duke@435 | 830 | _value.l = JNIHandles::make_local(_calling_thread, obj); |
duke@435 | 831 | break; |
duke@435 | 832 | } |
duke@435 | 833 | default: ShouldNotReachHere(); |
duke@435 | 834 | } |
duke@435 | 835 | } |
duke@435 | 836 | } |
duke@435 | 837 | |
duke@435 | 838 | |
duke@435 | 839 | bool VM_GetOrSetLocal::allow_nested_vm_operations() const { |
duke@435 | 840 | return true; // May need to deoptimize |
duke@435 | 841 | } |
duke@435 | 842 | |
duke@435 | 843 | |
duke@435 | 844 | ///////////////////////////////////////////////////////////////////////////////////////// |
duke@435 | 845 | |
duke@435 | 846 | // |
duke@435 | 847 | // class JvmtiSuspendControl - see comments in jvmtiImpl.hpp |
duke@435 | 848 | // |
duke@435 | 849 | |
duke@435 | 850 | bool JvmtiSuspendControl::suspend(JavaThread *java_thread) { |
duke@435 | 851 | // external suspend should have caught suspending a thread twice |
duke@435 | 852 | |
duke@435 | 853 | // Immediate suspension required for JPDA back-end so JVMTI agent threads do |
duke@435 | 854 | // not deadlock due to later suspension on transitions while holding |
duke@435 | 855 | // raw monitors. Passing true causes the immediate suspension. |
duke@435 | 856 | // java_suspend() will catch threads in the process of exiting |
duke@435 | 857 | // and will ignore them. |
duke@435 | 858 | java_thread->java_suspend(); |
duke@435 | 859 | |
duke@435 | 860 | // It would be nice to have the following assertion in all the time, |
duke@435 | 861 | // but it is possible for a racing resume request to have resumed |
duke@435 | 862 | // this thread right after we suspended it. Temporarily enable this |
duke@435 | 863 | // assertion if you are chasing a different kind of bug. |
duke@435 | 864 | // |
duke@435 | 865 | // assert(java_lang_Thread::thread(java_thread->threadObj()) == NULL || |
duke@435 | 866 | // java_thread->is_being_ext_suspended(), "thread is not suspended"); |
duke@435 | 867 | |
duke@435 | 868 | if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) { |
duke@435 | 869 | // check again because we can get delayed in java_suspend(): |
duke@435 | 870 | // the thread is in process of exiting. |
duke@435 | 871 | return false; |
duke@435 | 872 | } |
duke@435 | 873 | |
duke@435 | 874 | return true; |
duke@435 | 875 | } |
duke@435 | 876 | |
duke@435 | 877 | bool JvmtiSuspendControl::resume(JavaThread *java_thread) { |
duke@435 | 878 | // external suspend should have caught resuming a thread twice |
duke@435 | 879 | assert(java_thread->is_being_ext_suspended(), "thread should be suspended"); |
duke@435 | 880 | |
duke@435 | 881 | // resume thread |
duke@435 | 882 | { |
duke@435 | 883 | // must always grab Threads_lock, see JVM_SuspendThread |
duke@435 | 884 | MutexLocker ml(Threads_lock); |
duke@435 | 885 | java_thread->java_resume(); |
duke@435 | 886 | } |
duke@435 | 887 | |
duke@435 | 888 | return true; |
duke@435 | 889 | } |
duke@435 | 890 | |
duke@435 | 891 | |
duke@435 | 892 | void JvmtiSuspendControl::print() { |
duke@435 | 893 | #ifndef PRODUCT |
duke@435 | 894 | MutexLocker mu(Threads_lock); |
duke@435 | 895 | ResourceMark rm; |
duke@435 | 896 | |
duke@435 | 897 | tty->print("Suspended Threads: ["); |
duke@435 | 898 | for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { |
duke@435 | 899 | #if JVMTI_TRACE |
duke@435 | 900 | const char *name = JvmtiTrace::safe_get_thread_name(thread); |
duke@435 | 901 | #else |
duke@435 | 902 | const char *name = ""; |
duke@435 | 903 | #endif /*JVMTI_TRACE */ |
duke@435 | 904 | tty->print("%s(%c ", name, thread->is_being_ext_suspended() ? 'S' : '_'); |
duke@435 | 905 | if (!thread->has_last_Java_frame()) { |
duke@435 | 906 | tty->print("no stack"); |
duke@435 | 907 | } |
duke@435 | 908 | tty->print(") "); |
duke@435 | 909 | } |
duke@435 | 910 | tty->print_cr("]"); |
duke@435 | 911 | #endif |
duke@435 | 912 | } |