Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiThreadState.cpp @ 10133:6337ca4dcad8
8008511: JSR 292: MemberName vmtarget refs to methods must be updated at class redefinition
Summary: Lazily create and maintain the MemberNameTable to be able to update MemberName's
Reviewed-by: coleenp, jrose, dholmes
Contributed-by: serguei.spitsyn@oracle.com
author | sspitsyn |
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date | Sat, 20 Apr 2013 04:07:08 -0700 |
parents | da91efe96a93 |
children | 0d8d78c0329a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2012, 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; | |
66 | |
67 // JVMTI ForceEarlyReturn support | |
68 _pending_step_for_earlyret = false; | |
69 _earlyret_state = earlyret_inactive; | |
70 _earlyret_tos = ilgl; | |
71 _earlyret_value.j = 0L; | |
72 _earlyret_oop = NULL; | |
73 | |
74 // add all the JvmtiEnvThreadState to the new JvmtiThreadState | |
75 { | |
76 JvmtiEnvIterator it; | |
77 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
78 if (env->is_valid()) { | |
79 add_env(env); | |
80 } | |
81 } | |
82 } | |
83 | |
84 // link us into the list | |
85 { | |
86 // The thread state list manipulation code must not have safepoints. | |
87 // See periodic_clean_up(). | |
88 debug_only(No_Safepoint_Verifier nosafepoint;) | |
89 | |
90 _prev = NULL; | |
91 _next = _head; | |
92 if (_head != NULL) { | |
93 _head->_prev = this; | |
94 } | |
95 _head = this; | |
96 } | |
97 | |
98 // set this as the state for the thread | |
99 thread->set_jvmti_thread_state(this); | |
100 } | |
101 | |
102 | |
103 JvmtiThreadState::~JvmtiThreadState() { | |
104 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
105 | |
106 // clear this as the state for the thread | |
107 get_thread()->set_jvmti_thread_state(NULL); | |
108 | |
109 // zap our env thread states | |
110 { | |
111 JvmtiEnvBase::entering_dying_thread_env_iteration(); | |
112 JvmtiEnvThreadStateIterator it(this); | |
113 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ) { | |
114 JvmtiEnvThreadState* zap = ets; | |
115 ets = it.next(ets); | |
116 delete zap; | |
117 } | |
118 JvmtiEnvBase::leaving_dying_thread_env_iteration(); | |
119 } | |
120 | |
121 // remove us from the list | |
122 { | |
123 // The thread state list manipulation code must not have safepoints. | |
124 // See periodic_clean_up(). | |
125 debug_only(No_Safepoint_Verifier nosafepoint;) | |
126 | |
127 if (_prev == NULL) { | |
128 assert(_head == this, "sanity check"); | |
129 _head = _next; | |
130 } else { | |
131 assert(_head != this, "sanity check"); | |
132 _prev->_next = _next; | |
133 } | |
134 if (_next != NULL) { | |
135 _next->_prev = _prev; | |
136 } | |
137 _next = NULL; | |
138 _prev = NULL; | |
139 } | |
140 } | |
141 | |
142 | |
143 void | |
144 JvmtiThreadState::periodic_clean_up() { | |
145 assert(SafepointSynchronize::is_at_safepoint(), "at safepoint"); | |
146 | |
147 // This iteration is initialized with "_head" instead of "JvmtiThreadState::first()" | |
148 // because the latter requires the JvmtiThreadState_lock. | |
149 // This iteration is safe at a safepoint as well, see the No_Safepoint_Verifier | |
150 // asserts at all list manipulation sites. | |
151 for (JvmtiThreadState *state = _head; state != NULL; state = state->next()) { | |
152 // For each environment thread state corresponding to an invalid environment | |
153 // unlink it from the list and deallocate it. | |
154 JvmtiEnvThreadStateIterator it(state); | |
155 JvmtiEnvThreadState* previous_ets = NULL; | |
156 JvmtiEnvThreadState* ets = it.first(); | |
157 while (ets != NULL) { | |
158 if (ets->get_env()->is_valid()) { | |
159 previous_ets = ets; | |
160 ets = it.next(ets); | |
161 } else { | |
162 // This one isn't valid, remove it from the list and deallocate it | |
163 JvmtiEnvThreadState* defunct_ets = ets; | |
164 ets = ets->next(); | |
165 if (previous_ets == NULL) { | |
166 assert(state->head_env_thread_state() == defunct_ets, "sanity check"); | |
167 state->set_head_env_thread_state(ets); | |
168 } else { | |
169 previous_ets->set_next(ets); | |
170 } | |
171 delete defunct_ets; | |
172 } | |
173 } | |
174 } | |
175 } | |
176 | |
177 void JvmtiThreadState::add_env(JvmtiEnvBase *env) { | |
178 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
179 | |
180 JvmtiEnvThreadState *new_ets = new JvmtiEnvThreadState(_thread, env); | |
181 // add this environment thread state to the end of the list (order is important) | |
182 { | |
183 // list deallocation (which occurs at a safepoint) cannot occur simultaneously | |
184 debug_only(No_Safepoint_Verifier nosafepoint;) | |
185 | |
186 JvmtiEnvThreadStateIterator it(this); | |
187 JvmtiEnvThreadState* previous_ets = NULL; | |
188 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { | |
189 previous_ets = ets; | |
190 } | |
191 if (previous_ets == NULL) { | |
192 set_head_env_thread_state(new_ets); | |
193 } else { | |
194 previous_ets->set_next(new_ets); | |
195 } | |
196 } | |
197 } | |
198 | |
199 | |
200 | |
201 | |
202 void JvmtiThreadState::enter_interp_only_mode() { | |
203 assert(_thread->get_interp_only_mode() == 0, "entering interp only when mode not zero"); | |
204 _thread->increment_interp_only_mode(); | |
205 } | |
206 | |
207 | |
208 void JvmtiThreadState::leave_interp_only_mode() { | |
209 assert(_thread->get_interp_only_mode() == 1, "leaving interp only when mode not one"); | |
210 _thread->decrement_interp_only_mode(); | |
211 } | |
212 | |
213 | |
214 // Helper routine used in several places | |
215 int JvmtiThreadState::count_frames() { | |
216 #ifdef ASSERT | |
217 uint32_t debug_bits = 0; | |
218 #endif | |
219 assert(SafepointSynchronize::is_at_safepoint() || | |
220 JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), | |
221 "at safepoint or must be suspended"); | |
222 | |
223 if (!get_thread()->has_last_Java_frame()) return 0; // no Java frames | |
224 | |
225 ResourceMark rm; | |
226 RegisterMap reg_map(get_thread()); | |
227 javaVFrame *jvf = get_thread()->last_java_vframe(®_map); | |
228 int n = 0; | |
229 // tty->print_cr("CSD: counting frames on %s ...", | |
230 // JvmtiTrace::safe_get_thread_name(get_thread())); | |
231 while (jvf != NULL) { | |
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232 Method* method = jvf->method(); |
0 | 233 // tty->print_cr("CSD: frame - method %s.%s - loc %d", |
234 // method->klass_name()->as_C_string(), | |
235 // method->name()->as_C_string(), | |
236 // jvf->bci() ); | |
237 jvf = jvf->java_sender(); | |
238 n++; | |
239 } | |
240 // tty->print_cr("CSD: frame count: %d", n); | |
241 return n; | |
242 } | |
243 | |
244 | |
245 void JvmtiThreadState::invalidate_cur_stack_depth() { | |
246 Thread *cur = Thread::current(); | |
247 uint32_t debug_bits = 0; | |
248 | |
249 // The caller can be the VMThread at a safepoint, the current thread | |
250 // or the target thread must be suspended. | |
251 guarantee((cur->is_VM_thread() && SafepointSynchronize::is_at_safepoint()) || | |
252 (JavaThread *)cur == get_thread() || | |
253 JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), | |
254 "sanity check"); | |
255 | |
256 _cur_stack_depth = UNKNOWN_STACK_DEPTH; | |
257 } | |
258 | |
259 void JvmtiThreadState::incr_cur_stack_depth() { | |
260 guarantee(JavaThread::current() == get_thread(), "must be current thread"); | |
261 | |
262 if (!is_interp_only_mode()) { | |
263 _cur_stack_depth = UNKNOWN_STACK_DEPTH; | |
264 } | |
265 if (_cur_stack_depth != UNKNOWN_STACK_DEPTH) { | |
266 ++_cur_stack_depth; | |
267 } | |
268 } | |
269 | |
270 void JvmtiThreadState::decr_cur_stack_depth() { | |
271 guarantee(JavaThread::current() == get_thread(), "must be current thread"); | |
272 | |
273 if (!is_interp_only_mode()) { | |
274 _cur_stack_depth = UNKNOWN_STACK_DEPTH; | |
275 } | |
276 if (_cur_stack_depth != UNKNOWN_STACK_DEPTH) { | |
277 --_cur_stack_depth; | |
278 assert(_cur_stack_depth >= 0, "incr/decr_cur_stack_depth mismatch"); | |
279 } | |
280 } | |
281 | |
282 int JvmtiThreadState::cur_stack_depth() { | |
283 uint32_t debug_bits = 0; | |
284 guarantee(JavaThread::current() == get_thread() || | |
285 JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), | |
286 "must be current thread or suspended"); | |
287 | |
288 if (!is_interp_only_mode() || _cur_stack_depth == UNKNOWN_STACK_DEPTH) { | |
289 _cur_stack_depth = count_frames(); | |
290 } else { | |
291 // heavy weight assert | |
292 assert(_cur_stack_depth == count_frames(), | |
293 "cur_stack_depth out of sync"); | |
294 } | |
295 return _cur_stack_depth; | |
296 } | |
297 | |
298 bool JvmtiThreadState::may_be_walked() { | |
299 return (get_thread()->is_being_ext_suspended() || (JavaThread::current() == get_thread())); | |
300 } | |
301 | |
302 | |
303 void JvmtiThreadState::process_pending_step_for_popframe() { | |
304 // We are single stepping as the last part of the PopFrame() dance | |
305 // so we have some house keeping to do. | |
306 | |
307 JavaThread *thr = get_thread(); | |
308 if (thr->popframe_condition() != JavaThread::popframe_inactive) { | |
309 // If the popframe_condition field is not popframe_inactive, then | |
310 // we missed all of the popframe_field cleanup points: | |
311 // | |
312 // - unpack_frames() was not called (nothing to deopt) | |
313 // - remove_activation_preserving_args_entry() was not called | |
314 // (did not get suspended in a call_vm() family call and did | |
315 // not complete a call_vm() family call on the way here) | |
316 thr->clear_popframe_condition(); | |
317 } | |
318 | |
319 // clearing the flag indicates we are done with the PopFrame() dance | |
320 clr_pending_step_for_popframe(); | |
321 | |
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322 // If exception was thrown in this frame, need to reset jvmti thread state. |
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323 // Single stepping may not get enabled correctly by the agent since |
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324 // exception state is passed in MethodExit event which may be sent at some |
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325 // time in the future. JDWP agent ignores MethodExit events if caused by |
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326 // an exception. |
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327 // |
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328 if (is_exception_detected()) { |
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329 clear_exception_detected(); |
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330 } |
0 | 331 // If step is pending for popframe then it may not be |
332 // a repeat step. The new_bci and method_id is same as current_bci | |
333 // and current method_id after pop and step for recursive calls. | |
334 // Force the step by clearing the last location. | |
335 JvmtiEnvThreadStateIterator it(this); | |
336 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { | |
337 ets->clear_current_location(); | |
338 } | |
339 } | |
340 | |
341 | |
342 // Class: JvmtiThreadState | |
343 // Function: update_for_pop_top_frame | |
344 // Description: | |
345 // This function removes any frame pop notification request for | |
346 // the top frame and invalidates both the current stack depth and | |
347 // all cached frameIDs. | |
348 // | |
349 // Called by: PopFrame | |
350 // | |
351 void JvmtiThreadState::update_for_pop_top_frame() { | |
352 if (is_interp_only_mode()) { | |
353 // remove any frame pop notification request for the top frame | |
354 // in any environment | |
355 int popframe_number = cur_stack_depth(); | |
356 { | |
357 JvmtiEnvThreadStateIterator it(this); | |
358 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { | |
359 if (ets->is_frame_pop(popframe_number)) { | |
360 ets->clear_frame_pop(popframe_number); | |
361 } | |
362 } | |
363 } | |
364 // force stack depth to be recalculated | |
365 invalidate_cur_stack_depth(); | |
366 } else { | |
367 assert(!is_enabled(JVMTI_EVENT_FRAME_POP), "Must have no framepops set"); | |
368 } | |
369 } | |
370 | |
371 | |
372 void JvmtiThreadState::process_pending_step_for_earlyret() { | |
373 // We are single stepping as the last part of the ForceEarlyReturn | |
374 // dance so we have some house keeping to do. | |
375 | |
376 if (is_earlyret_pending()) { | |
377 // If the earlyret_state field is not earlyret_inactive, then | |
378 // we missed all of the earlyret_field cleanup points: | |
379 // | |
380 // - remove_activation() was not called | |
381 // (did not get suspended in a call_vm() family call and did | |
382 // not complete a call_vm() family call on the way here) | |
383 // | |
384 // One legitimate way for us to miss all the cleanup points is | |
385 // if we got here right after handling a compiled return. If that | |
386 // is the case, then we consider our return from compiled code to | |
387 // complete the ForceEarlyReturn request and we clear the condition. | |
388 clr_earlyret_pending(); | |
389 set_earlyret_oop(NULL); | |
390 clr_earlyret_value(); | |
391 } | |
392 | |
393 // clearing the flag indicates we are done with | |
394 // the ForceEarlyReturn() dance | |
395 clr_pending_step_for_earlyret(); | |
396 | |
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397 // If exception was thrown in this frame, need to reset jvmti thread state. |
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398 // Single stepping may not get enabled correctly by the agent since |
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399 // exception state is passed in MethodExit event which may be sent at some |
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400 // time in the future. JDWP agent ignores MethodExit events if caused by |
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401 // an exception. |
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402 // |
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403 if (is_exception_detected()) { |
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404 clear_exception_detected(); |
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405 } |
0 | 406 // If step is pending for earlyret then it may not be a repeat step. |
407 // The new_bci and method_id is same as current_bci and current | |
408 // method_id after earlyret and step for recursive calls. | |
409 // Force the step by clearing the last location. | |
410 JvmtiEnvThreadStateIterator it(this); | |
411 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { | |
412 ets->clear_current_location(); | |
413 } | |
414 } | |
415 | |
416 void JvmtiThreadState::oops_do(OopClosure* f) { | |
417 f->do_oop((oop*) &_earlyret_oop); | |
418 } |