Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiThreadState.cpp @ 14653:0d8d78c0329a
6471769: Error: assert(_cur_stack_depth == count_frames(),"cur_stack_depth out of sync")
Summary: It is more safe to get/update data for suspended threads at a safepoint
Reviewed-by: dcubed, twisti, dholmes
Contributed-by: serguei.spitsyn@oracle.com
| author | sspitsyn |
|---|---|
| date | Sat, 01 Mar 2014 08:05:55 -0800 |
| parents | da91efe96a93 |
| children | 92aa6797d639 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2014, 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 "jvmtifiles/jvmtiEnv.hpp" | |
| 27 #include "memory/gcLocker.hpp" | |
| 28 #include "memory/resourceArea.hpp" | |
| 29 #include "prims/jvmtiEventController.inline.hpp" | |
| 30 #include "prims/jvmtiImpl.hpp" | |
| 31 #include "prims/jvmtiThreadState.inline.hpp" | |
| 32 #include "runtime/vframe.hpp" | |
| 0 | 33 |
| 34 // marker for when the stack depth has been reset and is now unknown. | |
| 35 // any negative number would work but small ones might obscure an | |
| 36 // underrun error. | |
| 37 static const int UNKNOWN_STACK_DEPTH = -99; | |
| 38 | |
| 39 /////////////////////////////////////////////////////////////// | |
| 40 // | |
| 41 // class JvmtiThreadState | |
| 42 // | |
| 43 // Instances of JvmtiThreadState hang off of each thread. | |
| 44 // Thread local storage for JVMTI. | |
| 45 // | |
| 46 | |
| 47 JvmtiThreadState *JvmtiThreadState::_head = NULL; | |
| 48 | |
| 49 JvmtiThreadState::JvmtiThreadState(JavaThread* thread) | |
| 50 : _thread_event_enable() { | |
| 51 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
| 52 _thread = thread; | |
| 53 _exception_detected = false; | |
| 54 _exception_caught = false; | |
| 55 _debuggable = true; | |
| 56 _hide_single_stepping = false; | |
| 57 _hide_level = 0; | |
| 58 _pending_step_for_popframe = false; | |
| 59 _class_being_redefined = NULL; | |
| 60 _class_load_kind = jvmti_class_load_kind_load; | |
| 61 _head_env_thread_state = NULL; | |
| 62 _dynamic_code_event_collector = NULL; | |
| 63 _vm_object_alloc_event_collector = NULL; | |
| 64 _the_class_for_redefinition_verification = NULL; | |
| 65 _scratch_class_for_redefinition_verification = NULL; | |
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66 _cur_stack_depth = UNKNOWN_STACK_DEPTH; |
| 0 | 67 |
| 68 // JVMTI ForceEarlyReturn support | |
| 69 _pending_step_for_earlyret = false; | |
| 70 _earlyret_state = earlyret_inactive; | |
| 71 _earlyret_tos = ilgl; | |
| 72 _earlyret_value.j = 0L; | |
| 73 _earlyret_oop = NULL; | |
| 74 | |
| 75 // add all the JvmtiEnvThreadState to the new JvmtiThreadState | |
| 76 { | |
| 77 JvmtiEnvIterator it; | |
| 78 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
| 79 if (env->is_valid()) { | |
| 80 add_env(env); | |
| 81 } | |
| 82 } | |
| 83 } | |
| 84 | |
| 85 // link us into the list | |
| 86 { | |
| 87 // The thread state list manipulation code must not have safepoints. | |
| 88 // See periodic_clean_up(). | |
| 89 debug_only(No_Safepoint_Verifier nosafepoint;) | |
| 90 | |
| 91 _prev = NULL; | |
| 92 _next = _head; | |
| 93 if (_head != NULL) { | |
| 94 _head->_prev = this; | |
| 95 } | |
| 96 _head = this; | |
| 97 } | |
| 98 | |
| 99 // set this as the state for the thread | |
| 100 thread->set_jvmti_thread_state(this); | |
| 101 } | |
| 102 | |
| 103 | |
| 104 JvmtiThreadState::~JvmtiThreadState() { | |
| 105 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
| 106 | |
| 107 // clear this as the state for the thread | |
| 108 get_thread()->set_jvmti_thread_state(NULL); | |
| 109 | |
| 110 // zap our env thread states | |
| 111 { | |
| 112 JvmtiEnvBase::entering_dying_thread_env_iteration(); | |
| 113 JvmtiEnvThreadStateIterator it(this); | |
| 114 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ) { | |
| 115 JvmtiEnvThreadState* zap = ets; | |
| 116 ets = it.next(ets); | |
| 117 delete zap; | |
| 118 } | |
| 119 JvmtiEnvBase::leaving_dying_thread_env_iteration(); | |
| 120 } | |
| 121 | |
| 122 // remove us from the list | |
| 123 { | |
| 124 // The thread state list manipulation code must not have safepoints. | |
| 125 // See periodic_clean_up(). | |
| 126 debug_only(No_Safepoint_Verifier nosafepoint;) | |
| 127 | |
| 128 if (_prev == NULL) { | |
| 129 assert(_head == this, "sanity check"); | |
| 130 _head = _next; | |
| 131 } else { | |
| 132 assert(_head != this, "sanity check"); | |
| 133 _prev->_next = _next; | |
| 134 } | |
| 135 if (_next != NULL) { | |
| 136 _next->_prev = _prev; | |
| 137 } | |
| 138 _next = NULL; | |
| 139 _prev = NULL; | |
| 140 } | |
| 141 } | |
| 142 | |
| 143 | |
| 144 void | |
| 145 JvmtiThreadState::periodic_clean_up() { | |
| 146 assert(SafepointSynchronize::is_at_safepoint(), "at safepoint"); | |
| 147 | |
| 148 // This iteration is initialized with "_head" instead of "JvmtiThreadState::first()" | |
| 149 // because the latter requires the JvmtiThreadState_lock. | |
| 150 // This iteration is safe at a safepoint as well, see the No_Safepoint_Verifier | |
| 151 // asserts at all list manipulation sites. | |
| 152 for (JvmtiThreadState *state = _head; state != NULL; state = state->next()) { | |
| 153 // For each environment thread state corresponding to an invalid environment | |
| 154 // unlink it from the list and deallocate it. | |
| 155 JvmtiEnvThreadStateIterator it(state); | |
| 156 JvmtiEnvThreadState* previous_ets = NULL; | |
| 157 JvmtiEnvThreadState* ets = it.first(); | |
| 158 while (ets != NULL) { | |
| 159 if (ets->get_env()->is_valid()) { | |
| 160 previous_ets = ets; | |
| 161 ets = it.next(ets); | |
| 162 } else { | |
| 163 // This one isn't valid, remove it from the list and deallocate it | |
| 164 JvmtiEnvThreadState* defunct_ets = ets; | |
| 165 ets = ets->next(); | |
| 166 if (previous_ets == NULL) { | |
| 167 assert(state->head_env_thread_state() == defunct_ets, "sanity check"); | |
| 168 state->set_head_env_thread_state(ets); | |
| 169 } else { | |
| 170 previous_ets->set_next(ets); | |
| 171 } | |
| 172 delete defunct_ets; | |
| 173 } | |
| 174 } | |
| 175 } | |
| 176 } | |
| 177 | |
| 178 void JvmtiThreadState::add_env(JvmtiEnvBase *env) { | |
| 179 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
| 180 | |
| 181 JvmtiEnvThreadState *new_ets = new JvmtiEnvThreadState(_thread, env); | |
| 182 // add this environment thread state to the end of the list (order is important) | |
| 183 { | |
| 184 // list deallocation (which occurs at a safepoint) cannot occur simultaneously | |
| 185 debug_only(No_Safepoint_Verifier nosafepoint;) | |
| 186 | |
| 187 JvmtiEnvThreadStateIterator it(this); | |
| 188 JvmtiEnvThreadState* previous_ets = NULL; | |
| 189 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { | |
| 190 previous_ets = ets; | |
| 191 } | |
| 192 if (previous_ets == NULL) { | |
| 193 set_head_env_thread_state(new_ets); | |
| 194 } else { | |
| 195 previous_ets->set_next(new_ets); | |
| 196 } | |
| 197 } | |
| 198 } | |
| 199 | |
| 200 | |
| 201 | |
| 202 | |
| 203 void JvmtiThreadState::enter_interp_only_mode() { | |
| 204 assert(_thread->get_interp_only_mode() == 0, "entering interp only when mode not zero"); | |
| 205 _thread->increment_interp_only_mode(); | |
| 206 } | |
| 207 | |
| 208 | |
| 209 void JvmtiThreadState::leave_interp_only_mode() { | |
| 210 assert(_thread->get_interp_only_mode() == 1, "leaving interp only when mode not one"); | |
| 211 _thread->decrement_interp_only_mode(); | |
| 212 } | |
| 213 | |
| 214 | |
| 215 // Helper routine used in several places | |
| 216 int JvmtiThreadState::count_frames() { | |
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217 guarantee(SafepointSynchronize::is_at_safepoint() || |
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218 (JavaThread *)Thread::current() == get_thread(), |
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219 "must be current thread or at safepoint"); |
| 0 | 220 |
| 221 if (!get_thread()->has_last_Java_frame()) return 0; // no Java frames | |
| 222 | |
| 223 ResourceMark rm; | |
| 224 RegisterMap reg_map(get_thread()); | |
| 225 javaVFrame *jvf = get_thread()->last_java_vframe(®_map); | |
| 226 int n = 0; | |
| 227 // tty->print_cr("CSD: counting frames on %s ...", | |
| 228 // JvmtiTrace::safe_get_thread_name(get_thread())); | |
| 229 while (jvf != NULL) { | |
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230 Method* method = jvf->method(); |
| 0 | 231 // tty->print_cr("CSD: frame - method %s.%s - loc %d", |
| 232 // method->klass_name()->as_C_string(), | |
| 233 // method->name()->as_C_string(), | |
| 234 // jvf->bci() ); | |
| 235 jvf = jvf->java_sender(); | |
| 236 n++; | |
| 237 } | |
| 238 // tty->print_cr("CSD: frame count: %d", n); | |
| 239 return n; | |
| 240 } | |
| 241 | |
| 242 | |
| 243 void JvmtiThreadState::invalidate_cur_stack_depth() { | |
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244 guarantee(SafepointSynchronize::is_at_safepoint() || |
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245 (JavaThread *)Thread::current() == get_thread(), |
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246 "must be current thread or at safepoint"); |
| 0 | 247 |
| 248 _cur_stack_depth = UNKNOWN_STACK_DEPTH; | |
| 249 } | |
| 250 | |
| 251 void JvmtiThreadState::incr_cur_stack_depth() { | |
| 252 guarantee(JavaThread::current() == get_thread(), "must be current thread"); | |
| 253 | |
| 254 if (!is_interp_only_mode()) { | |
| 255 _cur_stack_depth = UNKNOWN_STACK_DEPTH; | |
| 256 } | |
| 257 if (_cur_stack_depth != UNKNOWN_STACK_DEPTH) { | |
| 258 ++_cur_stack_depth; | |
| 259 } | |
| 260 } | |
| 261 | |
| 262 void JvmtiThreadState::decr_cur_stack_depth() { | |
| 263 guarantee(JavaThread::current() == get_thread(), "must be current thread"); | |
| 264 | |
| 265 if (!is_interp_only_mode()) { | |
| 266 _cur_stack_depth = UNKNOWN_STACK_DEPTH; | |
| 267 } | |
| 268 if (_cur_stack_depth != UNKNOWN_STACK_DEPTH) { | |
| 269 --_cur_stack_depth; | |
| 270 assert(_cur_stack_depth >= 0, "incr/decr_cur_stack_depth mismatch"); | |
| 271 } | |
| 272 } | |
| 273 | |
| 274 int JvmtiThreadState::cur_stack_depth() { | |
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275 guarantee(SafepointSynchronize::is_at_safepoint() || |
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276 (JavaThread *)Thread::current() == get_thread(), |
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277 "must be current thread or at safepoint"); |
| 0 | 278 |
| 279 if (!is_interp_only_mode() || _cur_stack_depth == UNKNOWN_STACK_DEPTH) { | |
| 280 _cur_stack_depth = count_frames(); | |
| 281 } else { | |
| 282 // heavy weight assert | |
| 283 assert(_cur_stack_depth == count_frames(), | |
| 284 "cur_stack_depth out of sync"); | |
| 285 } | |
| 286 return _cur_stack_depth; | |
| 287 } | |
| 288 | |
| 289 bool JvmtiThreadState::may_be_walked() { | |
| 290 return (get_thread()->is_being_ext_suspended() || (JavaThread::current() == get_thread())); | |
| 291 } | |
| 292 | |
| 293 | |
| 294 void JvmtiThreadState::process_pending_step_for_popframe() { | |
| 295 // We are single stepping as the last part of the PopFrame() dance | |
| 296 // so we have some house keeping to do. | |
| 297 | |
| 298 JavaThread *thr = get_thread(); | |
| 299 if (thr->popframe_condition() != JavaThread::popframe_inactive) { | |
| 300 // If the popframe_condition field is not popframe_inactive, then | |
| 301 // we missed all of the popframe_field cleanup points: | |
| 302 // | |
| 303 // - unpack_frames() was not called (nothing to deopt) | |
| 304 // - remove_activation_preserving_args_entry() was not called | |
| 305 // (did not get suspended in a call_vm() family call and did | |
| 306 // not complete a call_vm() family call on the way here) | |
| 307 thr->clear_popframe_condition(); | |
| 308 } | |
| 309 | |
| 310 // clearing the flag indicates we are done with the PopFrame() dance | |
| 311 clr_pending_step_for_popframe(); | |
| 312 | |
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313 // If exception was thrown in this frame, need to reset jvmti thread state. |
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314 // Single stepping may not get enabled correctly by the agent since |
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315 // exception state is passed in MethodExit event which may be sent at some |
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316 // time in the future. JDWP agent ignores MethodExit events if caused by |
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317 // an exception. |
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318 // |
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319 if (is_exception_detected()) { |
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320 clear_exception_detected(); |
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321 } |
| 0 | 322 // If step is pending for popframe then it may not be |
| 323 // a repeat step. The new_bci and method_id is same as current_bci | |
| 324 // and current method_id after pop and step for recursive calls. | |
| 325 // Force the step by clearing the last location. | |
| 326 JvmtiEnvThreadStateIterator it(this); | |
| 327 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { | |
| 328 ets->clear_current_location(); | |
| 329 } | |
| 330 } | |
| 331 | |
| 332 | |
| 333 // Class: JvmtiThreadState | |
| 334 // Function: update_for_pop_top_frame | |
| 335 // Description: | |
| 336 // This function removes any frame pop notification request for | |
| 337 // the top frame and invalidates both the current stack depth and | |
| 338 // all cached frameIDs. | |
| 339 // | |
| 340 // Called by: PopFrame | |
| 341 // | |
| 342 void JvmtiThreadState::update_for_pop_top_frame() { | |
| 343 if (is_interp_only_mode()) { | |
| 344 // remove any frame pop notification request for the top frame | |
| 345 // in any environment | |
| 346 int popframe_number = cur_stack_depth(); | |
| 347 { | |
| 348 JvmtiEnvThreadStateIterator it(this); | |
| 349 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { | |
| 350 if (ets->is_frame_pop(popframe_number)) { | |
| 351 ets->clear_frame_pop(popframe_number); | |
| 352 } | |
| 353 } | |
| 354 } | |
| 355 // force stack depth to be recalculated | |
| 356 invalidate_cur_stack_depth(); | |
| 357 } else { | |
| 358 assert(!is_enabled(JVMTI_EVENT_FRAME_POP), "Must have no framepops set"); | |
| 359 } | |
| 360 } | |
| 361 | |
| 362 | |
| 363 void JvmtiThreadState::process_pending_step_for_earlyret() { | |
| 364 // We are single stepping as the last part of the ForceEarlyReturn | |
| 365 // dance so we have some house keeping to do. | |
| 366 | |
| 367 if (is_earlyret_pending()) { | |
| 368 // If the earlyret_state field is not earlyret_inactive, then | |
| 369 // we missed all of the earlyret_field cleanup points: | |
| 370 // | |
| 371 // - remove_activation() was not called | |
| 372 // (did not get suspended in a call_vm() family call and did | |
| 373 // not complete a call_vm() family call on the way here) | |
| 374 // | |
| 375 // One legitimate way for us to miss all the cleanup points is | |
| 376 // if we got here right after handling a compiled return. If that | |
| 377 // is the case, then we consider our return from compiled code to | |
| 378 // complete the ForceEarlyReturn request and we clear the condition. | |
| 379 clr_earlyret_pending(); | |
| 380 set_earlyret_oop(NULL); | |
| 381 clr_earlyret_value(); | |
| 382 } | |
| 383 | |
| 384 // clearing the flag indicates we are done with | |
| 385 // the ForceEarlyReturn() dance | |
| 386 clr_pending_step_for_earlyret(); | |
| 387 | |
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388 // If exception was thrown in this frame, need to reset jvmti thread state. |
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389 // Single stepping may not get enabled correctly by the agent since |
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390 // exception state is passed in MethodExit event which may be sent at some |
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391 // time in the future. JDWP agent ignores MethodExit events if caused by |
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392 // an exception. |
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393 // |
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394 if (is_exception_detected()) { |
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395 clear_exception_detected(); |
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396 } |
| 0 | 397 // If step is pending for earlyret then it may not be a repeat step. |
| 398 // The new_bci and method_id is same as current_bci and current | |
| 399 // method_id after earlyret and step for recursive calls. | |
| 400 // Force the step by clearing the last location. | |
| 401 JvmtiEnvThreadStateIterator it(this); | |
| 402 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { | |
| 403 ets->clear_current_location(); | |
| 404 } | |
| 405 } | |
| 406 | |
| 407 void JvmtiThreadState::oops_do(OopClosure* f) { | |
| 408 f->do_oop((oop*) &_earlyret_oop); | |
| 409 } |