1 /*
2 * Copyright (c) 2021, 2024, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "code/nmethod.hpp"
27 #include "code/scopeDesc.hpp"
28 #include "gc/shared/barrierSet.hpp"
29 #include "gc/shared/barrierSetStackChunk.hpp"
30 #include "logging/log.hpp"
31 #include "logging/logStream.hpp"
32 #include "memory/memRegion.hpp"
33 #include "oops/instanceStackChunkKlass.inline.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "oops/stackChunkOop.inline.hpp"
36 #include "runtime/frame.hpp"
37 #include "runtime/registerMap.hpp"
38 #include "runtime/smallRegisterMap.inline.hpp"
39 #include "runtime/stackChunkFrameStream.inline.hpp"
40
41 // Note: Some functions in this file work with stale object pointers, e.g.
42 // DerivedPointerSupport. Be extra careful to not put those pointers into
43 // variables of the 'oop' type. There's extra GC verification around oops
44 // that may fail when stale oops are being used.
45
46 template <typename RegisterMapT>
47 class FrameOopIterator : public OopIterator {
48 private:
49 const frame& _f;
50 const RegisterMapT* _map;
51
52 public:
53 FrameOopIterator(const frame& f, const RegisterMapT* map)
54 : _f(f),
55 _map(map) {
56 }
57
58 virtual void oops_do(OopClosure* cl) override {
59 if (_f.is_interpreted_frame()) {
60 _f.oops_interpreted_do(cl, nullptr);
61 } else {
62 OopMapDo<OopClosure, DerivedOopClosure, IncludeAllValues> visitor(cl, nullptr);
63 visitor.oops_do(&_f, _map, _f.oop_map());
64 }
65 }
66 };
67
68 frame stackChunkOopDesc::top_frame(RegisterMap* map) {
69 assert(!is_empty(), "");
70 StackChunkFrameStream<ChunkFrames::Mixed> fs(this);
71
72 map->set_stack_chunk(this);
73 fs.initialize_register_map(map);
74
75 frame f = fs.to_frame();
76
77 assert(to_offset(f.sp()) == sp(), "f.offset_sp(): %d sp(): %d async: %d", f.offset_sp(), sp(), map->is_async());
78 relativize_frame(f);
79 f.set_frame_index(0);
80 return f;
81 }
82
83 frame stackChunkOopDesc::sender(const frame& f, RegisterMap* map) {
84 assert(map->in_cont(), "");
85 assert(!map->include_argument_oops(), "");
86 assert(!f.is_empty(), "");
87 assert(map->stack_chunk() == this, "");
88 assert(!is_empty(), "");
89
90 int index = f.frame_index(); // we need to capture the index before calling derelativize, which destroys it
91 StackChunkFrameStream<ChunkFrames::Mixed> fs(this, derelativize(f));
92 fs.next(map);
93
94 if (!fs.is_done()) {
95 frame sender = fs.to_frame();
96 assert(is_usable_in_chunk(sender.unextended_sp()), "");
97 relativize_frame(sender);
98
99 sender.set_frame_index(index+1);
100 return sender;
101 }
102
103 if (parent() != nullptr) {
104 assert(!parent()->is_empty(), "");
105 return parent()->top_frame(map);
106 }
107
108 return Continuation::continuation_parent_frame(map);
109 }
110
111 static int num_java_frames(nmethod* nm, address pc) {
112 int count = 0;
113 for (ScopeDesc* scope = nm->scope_desc_at(pc); scope != nullptr; scope = scope->sender()) {
114 count++;
115 }
116 return count;
117 }
118
119 static int num_java_frames(const StackChunkFrameStream<ChunkFrames::Mixed>& f) {
120 assert(f.is_interpreted()
121 || (f.cb() != nullptr && f.cb()->is_nmethod() && f.cb()->as_nmethod()->is_java_method()), "");
122 return f.is_interpreted() ? 1 : num_java_frames(f.cb()->as_nmethod(), f.orig_pc());
123 }
124
125 int stackChunkOopDesc::num_java_frames() const {
126 int n = 0;
127 for (StackChunkFrameStream<ChunkFrames::Mixed> f(const_cast<stackChunkOopDesc*>(this)); !f.is_done();
128 f.next(SmallRegisterMap::instance)) {
129 if (!f.is_stub()) {
130 n += ::num_java_frames(f);
131 }
132 }
133 return n;
134 }
135
136 template <stackChunkOopDesc::BarrierType barrier>
137 class DoBarriersStackClosure {
138 const stackChunkOop _chunk;
139
140 public:
141 DoBarriersStackClosure(stackChunkOop chunk) : _chunk(chunk) {}
142
143 template <ChunkFrames frame_kind, typename RegisterMapT>
144 bool do_frame(const StackChunkFrameStream<frame_kind>& f, const RegisterMapT* map) {
145 _chunk->do_barriers0<barrier>(f, map);
146 return true;
147 }
148 };
149
150 template <stackChunkOopDesc::BarrierType barrier>
151 void stackChunkOopDesc::do_barriers() {
152 DoBarriersStackClosure<barrier> closure(this);
153 iterate_stack(&closure);
154 }
155
156 template void stackChunkOopDesc::do_barriers<stackChunkOopDesc::BarrierType::Load> ();
157 template void stackChunkOopDesc::do_barriers<stackChunkOopDesc::BarrierType::Store>();
158
159 class DerivedPointersSupport {
160 public:
161 static void relativize(derived_base* base_loc, derived_pointer* derived_loc) {
162 // The base oop could be stale from the GC's point-of-view. Treat it as an
163 // uintptr_t to stay clear of the oop verification code in oopsHierarcy.hpp.
164 uintptr_t base = *(uintptr_t*)base_loc;
165 if (base == 0) {
166 return;
167 }
168 assert(!UseCompressedOops || !CompressedOops::is_base((void*)base), "");
169
170 // This is always a full derived pointer
171 uintptr_t derived_int_val = *(uintptr_t*)derived_loc;
172
173 // Make the pointer an offset (relativize) and store it at the same location
174 uintptr_t offset = derived_int_val - base;
175 *(uintptr_t*)derived_loc = offset;
176 }
177
178 static void derelativize(derived_base* base_loc, derived_pointer* derived_loc) {
179 uintptr_t base = *(uintptr_t*)base_loc;
180 if (base == 0) {
181 return;
182 }
183 assert(!UseCompressedOops || !CompressedOops::is_base((void*)base), "");
184
185 // All derived pointers should have been relativized into offsets
186 uintptr_t offset = *(uintptr_t*)derived_loc;
187
188 // Restore the original derived pointer
189 *(uintptr_t*)derived_loc = base + offset;
190 }
191
192 struct RelativizeClosure : public DerivedOopClosure {
193 virtual void do_derived_oop(derived_base* base_loc, derived_pointer* derived_loc) override {
194 DerivedPointersSupport::relativize(base_loc, derived_loc);
195 }
196 };
197
198 struct DerelativizeClosure : public DerivedOopClosure {
199 virtual void do_derived_oop(derived_base* base_loc, derived_pointer* derived_loc) override {
200 DerivedPointersSupport::derelativize(base_loc, derived_loc);
201 }
202 };
203 };
204
205 template <typename DerivedPointerClosureType>
206 class EncodeGCModeConcurrentFrameClosure {
207 stackChunkOop _chunk;
208 DerivedPointerClosureType* _cl;
209
210 public:
211 EncodeGCModeConcurrentFrameClosure(stackChunkOop chunk, DerivedPointerClosureType* cl)
212 : _chunk(chunk),
213 _cl(cl) {
214 }
215
216 template <ChunkFrames frame_kind, typename RegisterMapT>
217 bool do_frame(const StackChunkFrameStream<frame_kind>& f, const RegisterMapT* map) {
218 f.iterate_derived_pointers(_cl, map);
219
220 BarrierSetStackChunk* bs_chunk = BarrierSet::barrier_set()->barrier_set_stack_chunk();
221 frame fr = f.to_frame();
222 FrameOopIterator<RegisterMapT> iterator(fr, map);
223 bs_chunk->encode_gc_mode(_chunk, &iterator);
224
225 return true;
226 }
227 };
228
229 bool stackChunkOopDesc::try_acquire_relativization() {
230 for (;;) {
231 // We use an acquiring load when reading the flags to ensure that if we leave this
232 // function thinking that relativization is finished, we know that if another thread
233 // did the relativization, we will still be able to observe the relativized derived
234 // pointers, which is important as subsequent modifications of derived pointers must
235 // happen after relativization.
236 uint8_t flags_before = flags_acquire();
237 if ((flags_before & FLAG_GC_MODE) != 0) {
238 // Terminal state - relativization is ensured
239 return false;
240 }
241
242 if ((flags_before & FLAG_CLAIM_RELATIVIZE) != 0) {
243 // Someone else has claimed relativization - wait for completion
244 MonitorLocker ml(ContinuationRelativize_lock, Mutex::_no_safepoint_check_flag);
245 uint8_t flags_under_lock = flags_acquire();
246 if ((flags_under_lock & FLAG_GC_MODE) != 0) {
247 // Terminal state - relativization is ensured
248 return false;
249 }
250
251 if ((flags_under_lock & FLAG_NOTIFY_RELATIVIZE) != 0) {
252 // Relativization is claimed by another thread, and it knows it needs to notify
253 ml.wait();
254 } else if (try_set_flags(flags_under_lock, flags_under_lock | FLAG_NOTIFY_RELATIVIZE)) {
255 // Relativization is claimed by another thread, and it knows it needs to notify
256 ml.wait();
257 }
258 // Retry - rerun the loop
259 continue;
260 }
261
262 if (try_set_flags(flags_before, flags_before | FLAG_CLAIM_RELATIVIZE)) {
263 // Claimed relativization - let's do it
264 return true;
265 }
266 }
267 }
268
269 void stackChunkOopDesc::release_relativization() {
270 for (;;) {
271 uint8_t flags_before = flags();
272 if ((flags_before & FLAG_NOTIFY_RELATIVIZE) != 0) {
273 MonitorLocker ml(ContinuationRelativize_lock, Mutex::_no_safepoint_check_flag);
274 // No need to CAS the terminal state; nobody else can be racingly mutating here
275 // as both claim and notify flags are already set (and monotonic)
276 // We do however need to use a releasing store on the flags, to ensure that
277 // the reader of that value (using load_acquire) will be able to observe
278 // the relativization of the derived pointers
279 uint8_t flags_under_lock = flags();
280 release_set_flags(flags_under_lock | FLAG_GC_MODE);
281 ml.notify_all();
282 return;
283 }
284
285 if (try_set_flags(flags_before, flags_before | FLAG_GC_MODE)) {
286 // Successfully set the terminal state; we are done
287 return;
288 }
289 }
290 }
291
292 void stackChunkOopDesc::relativize_derived_pointers_concurrently() {
293 if (!try_acquire_relativization()) {
294 // Already relativized
295 return;
296 }
297
298 DerivedPointersSupport::RelativizeClosure derived_cl;
299 EncodeGCModeConcurrentFrameClosure<decltype(derived_cl)> frame_cl(this, &derived_cl);
300 iterate_stack(&frame_cl);
301
302 release_relativization();
303 }
304
305 class TransformStackChunkClosure {
306 stackChunkOop _chunk;
307
308 public:
309 TransformStackChunkClosure(stackChunkOop chunk) : _chunk(chunk) { }
310
311 template <ChunkFrames frame_kind, typename RegisterMapT>
312 bool do_frame(const StackChunkFrameStream<frame_kind>& f, const RegisterMapT* map) {
313 DerivedPointersSupport::RelativizeClosure derived_cl;
314 f.iterate_derived_pointers(&derived_cl, map);
315
316 BarrierSetStackChunk* bs_chunk = BarrierSet::barrier_set()->barrier_set_stack_chunk();
317 frame fr = f.to_frame();
318 FrameOopIterator<RegisterMapT> iterator(fr, map);
319 bs_chunk->encode_gc_mode(_chunk, &iterator);
320
321 return true;
322 }
323 };
324
325 void stackChunkOopDesc::transform() {
326 assert(!is_gc_mode(), "Should only be called once per chunk");
327 set_gc_mode(true);
328
329 assert(!has_bitmap(), "Should only be set once");
330 set_has_bitmap(true);
331 bitmap().clear();
332
333 TransformStackChunkClosure closure(this);
334 iterate_stack(&closure);
335 }
336
337 template <stackChunkOopDesc::BarrierType barrier, bool compressedOopsWithBitmap>
338 class BarrierClosure: public OopClosure {
339 NOT_PRODUCT(intptr_t* _sp;)
340
341 public:
342 BarrierClosure(intptr_t* sp) NOT_PRODUCT(: _sp(sp)) {}
343
344 virtual void do_oop(oop* p) override { compressedOopsWithBitmap ? do_oop_work((narrowOop*)p) : do_oop_work(p); }
345 virtual void do_oop(narrowOop* p) override { do_oop_work(p); }
346
347 template <class T> inline void do_oop_work(T* p) {
348 oop value = (oop)HeapAccess<>::oop_load(p);
349 if (barrier == stackChunkOopDesc::BarrierType::Store) {
350 HeapAccess<>::oop_store(p, value);
351 }
352 }
353 };
354
355 template <stackChunkOopDesc::BarrierType barrier, ChunkFrames frame_kind, typename RegisterMapT>
356 void stackChunkOopDesc::do_barriers0(const StackChunkFrameStream<frame_kind>& f, const RegisterMapT* map) {
357 // We need to invoke the write barriers so as not to miss oops in old chunks that haven't yet been concurrently scanned
358 assert (!f.is_done(), "");
359
360 if (f.is_interpreted()) {
361 Method* m = f.to_frame().interpreter_frame_method();
362 // Class redefinition support
363 m->record_gc_epoch();
364 } else if (f.is_compiled()) {
365 nmethod* nm = f.cb()->as_nmethod();
366 // The entry barrier takes care of having the right synchronization
367 // when keeping the nmethod alive during concurrent execution.
368 nm->run_nmethod_entry_barrier();
369 // There is no need to mark the Method, as class redefinition will walk the
370 // CodeCache, noting their Methods
371 }
372
373 if (has_bitmap() && UseCompressedOops) {
374 BarrierClosure<barrier, true> oops_closure(f.sp());
375 f.iterate_oops(&oops_closure, map);
376 } else {
377 BarrierClosure<barrier, false> oops_closure(f.sp());
378 f.iterate_oops(&oops_closure, map);
379 }
380 }
381
382 template void stackChunkOopDesc::do_barriers0<stackChunkOopDesc::BarrierType::Load> (const StackChunkFrameStream<ChunkFrames::Mixed>& f, const RegisterMap* map);
383 template void stackChunkOopDesc::do_barriers0<stackChunkOopDesc::BarrierType::Store>(const StackChunkFrameStream<ChunkFrames::Mixed>& f, const RegisterMap* map);
384 template void stackChunkOopDesc::do_barriers0<stackChunkOopDesc::BarrierType::Load> (const StackChunkFrameStream<ChunkFrames::CompiledOnly>& f, const RegisterMap* map);
385 template void stackChunkOopDesc::do_barriers0<stackChunkOopDesc::BarrierType::Store>(const StackChunkFrameStream<ChunkFrames::CompiledOnly>& f, const RegisterMap* map);
386 template void stackChunkOopDesc::do_barriers0<stackChunkOopDesc::BarrierType::Load> (const StackChunkFrameStream<ChunkFrames::Mixed>& f, const SmallRegisterMap* map);
387 template void stackChunkOopDesc::do_barriers0<stackChunkOopDesc::BarrierType::Store>(const StackChunkFrameStream<ChunkFrames::Mixed>& f, const SmallRegisterMap* map);
388 template void stackChunkOopDesc::do_barriers0<stackChunkOopDesc::BarrierType::Load> (const StackChunkFrameStream<ChunkFrames::CompiledOnly>& f, const SmallRegisterMap* map);
389 template void stackChunkOopDesc::do_barriers0<stackChunkOopDesc::BarrierType::Store>(const StackChunkFrameStream<ChunkFrames::CompiledOnly>& f, const SmallRegisterMap* map);
390
391 template <typename RegisterMapT>
392 void stackChunkOopDesc::fix_thawed_frame(const frame& f, const RegisterMapT* map) {
393 if (!(is_gc_mode() || requires_barriers())) {
394 return;
395 }
396
397 BarrierSetStackChunk* bs_chunk = BarrierSet::barrier_set()->barrier_set_stack_chunk();
398 FrameOopIterator<RegisterMapT> iterator(f, map);
399 bs_chunk->decode_gc_mode(this, &iterator);
400
401 if (f.is_compiled_frame() && f.oop_map()->has_derived_oops()) {
402 DerivedPointersSupport::DerelativizeClosure derived_closure;
403 OopMapDo<OopClosure, DerivedPointersSupport::DerelativizeClosure, SkipNullValue> visitor(nullptr, &derived_closure);
404 visitor.oops_do(&f, map, f.oop_map());
405 }
406 }
407
408 template void stackChunkOopDesc::fix_thawed_frame(const frame& f, const RegisterMap* map);
409 template void stackChunkOopDesc::fix_thawed_frame(const frame& f, const SmallRegisterMap* map);
410
411 void stackChunkOopDesc::print_on(bool verbose, outputStream* st) const {
412 if (*((juint*)this) == badHeapWordVal) {
413 st->print_cr("BAD WORD");
414 } else {
415 InstanceStackChunkKlass::print_chunk(const_cast<stackChunkOopDesc*>(this), verbose, st);
416 }
417 }
418
419 #ifdef ASSERT
420
421 class StackChunkVerifyOopsClosure : public OopClosure {
422 stackChunkOop _chunk;
423 int _count;
424
425 public:
426 StackChunkVerifyOopsClosure(stackChunkOop chunk)
427 : _chunk(chunk), _count(0) {}
428
429 void do_oop(oop* p) override { (_chunk->has_bitmap() && UseCompressedOops) ? do_oop_work((narrowOop*)p) : do_oop_work(p); }
430 void do_oop(narrowOop* p) override { do_oop_work(p); }
431
432 template <typename T> inline void do_oop_work(T* p) {
433 _count++;
434 oop obj = _chunk->load_oop(p);
435 assert(obj == nullptr || dbg_is_good_oop(obj), "p: " PTR_FORMAT " obj: " PTR_FORMAT, p2i(p), p2i(obj));
436 if (_chunk->has_bitmap()) {
437 BitMap::idx_t index = _chunk->bit_index_for(p);
438 assert(_chunk->bitmap().at(index), "Bit not set at index " SIZE_FORMAT " corresponding to " PTR_FORMAT, index, p2i(p));
439 }
440 }
441
442 int count() const { return _count; }
443 };
444
445 class VerifyStackChunkFrameClosure {
446 stackChunkOop _chunk;
447
448 public:
449 intptr_t* _sp;
450 CodeBlob* _cb;
451 bool _callee_interpreted;
452 int _size;
453 int _argsize;
454 int _num_oops;
455 int _num_frames;
456 int _num_interpreted_frames;
457 int _num_i2c;
458
459 VerifyStackChunkFrameClosure(stackChunkOop chunk, int num_frames, int size)
460 : _chunk(chunk), _sp(nullptr), _cb(nullptr), _callee_interpreted(false),
461 _size(size), _argsize(0), _num_oops(0), _num_frames(num_frames), _num_interpreted_frames(0), _num_i2c(0) {}
462
463 template <ChunkFrames frame_kind, typename RegisterMapT>
464 bool do_frame(const StackChunkFrameStream<frame_kind>& f, const RegisterMapT* map) {
465 _sp = f.sp();
466 _cb = f.cb();
467
468 int fsize = f.frame_size() - ((f.is_interpreted() == _callee_interpreted) ? _argsize : 0);
469 int num_oops = f.num_oops();
470 assert(num_oops >= 0, "");
471
472 _argsize = f.stack_argsize() + frame::metadata_words_at_top;
473 _size += fsize;
474 _num_oops += num_oops;
475 if (f.is_interpreted()) {
476 _num_interpreted_frames++;
477 }
478
479 log_develop_trace(continuations)("debug_verify_stack_chunk frame: %d sp: " INTPTR_FORMAT " pc: " PTR_FORMAT " interpreted: %d size: %d argsize: %d oops: %d", _num_frames, f.sp() - _chunk->start_address(), p2i(f.pc()), f.is_interpreted(), fsize, _argsize, num_oops);
480 LogTarget(Trace, continuations) lt;
481 if (lt.develop_is_enabled()) {
482 LogStream ls(lt);
483 f.print_on(&ls);
484 }
485 assert(f.pc() != nullptr,
486 "young: %d num_frames: %d sp: " PTR_FORMAT " start: " PTR_FORMAT " end: " PTR_FORMAT,
487 !_chunk->requires_barriers(), _num_frames, p2i(f.sp()), p2i(_chunk->start_address()), p2i(_chunk->bottom_address()));
488
489 if (_num_frames == 0) {
490 assert(f.pc() == _chunk->pc(), "");
491 }
492
493 if (_num_frames > 0 && !_callee_interpreted && f.is_interpreted()) {
494 log_develop_trace(continuations)("debug_verify_stack_chunk i2c");
495 _num_i2c++;
496 }
497
498 StackChunkVerifyOopsClosure oops_closure(_chunk);
499 f.iterate_oops(&oops_closure, map);
500 assert(oops_closure.count() == num_oops, "oops: %d oopmap->num_oops(): %d", oops_closure.count(), num_oops);
501
502 _callee_interpreted = f.is_interpreted();
503 _num_frames++;
504 return true;
505 }
506 };
507
508 template <typename T>
509 class StackChunkVerifyBitmapClosure : public BitMapClosure {
510 stackChunkOop _chunk;
511
512 public:
513 int _count;
514
515 StackChunkVerifyBitmapClosure(stackChunkOop chunk) : _chunk(chunk), _count(0) {}
516
517 bool do_bit(BitMap::idx_t index) override {
518 T* p = _chunk->address_for_bit<T>(index);
519 _count++;
520
521 oop obj = _chunk->load_oop(p);
522 assert(obj == nullptr || dbg_is_good_oop(obj),
523 "p: " PTR_FORMAT " obj: " PTR_FORMAT " index: " SIZE_FORMAT,
524 p2i(p), p2i((oopDesc*)obj), index);
525
526 return true; // continue processing
527 }
528 };
529
530 bool stackChunkOopDesc::verify(size_t* out_size, int* out_oops, int* out_frames, int* out_interpreted_frames) {
531 DEBUG_ONLY(if (!VerifyContinuations) return true;)
532
533 assert(oopDesc::is_oop(this), "");
534
535 assert(stack_size() >= 0, "");
536 assert(argsize() >= 0, "");
537 assert(!has_bitmap() || is_gc_mode(), "");
538
539 if (is_empty()) {
540 assert(argsize() == 0, "");
541 assert(max_thawing_size() == 0, "");
542 }
543
544 assert(oopDesc::is_oop_or_null(parent()), "");
545
546 const bool concurrent = !Thread::current()->is_Java_thread();
547
548 // If argsize == 0 and the chunk isn't mixed, the chunk contains the metadata (pc, fp -- frame::sender_sp_offset)
549 // for the top frame (below sp), and *not* for the bottom frame.
550 int size = stack_size() - argsize() - sp();
551 assert(size >= 0, "");
552 assert((size == 0) == is_empty(), "");
553
554 const StackChunkFrameStream<ChunkFrames::Mixed> first(this);
555 const bool has_safepoint_stub_frame = first.is_stub();
556
557 VerifyStackChunkFrameClosure closure(this,
558 has_safepoint_stub_frame ? 1 : 0, // Iterate_stack skips the safepoint stub
559 has_safepoint_stub_frame ? first.frame_size() : 0);
560 iterate_stack(&closure);
561
562 assert(!is_empty() || closure._cb == nullptr, "");
563 if (closure._cb != nullptr && closure._cb->is_nmethod()) {
564 assert(argsize() ==
565 (closure._cb->as_nmethod()->num_stack_arg_slots()*VMRegImpl::stack_slot_size) >>LogBytesPerWord,
566 "chunk argsize: %d bottom frame argsize: %d", argsize(),
567 (closure._cb->as_nmethod()->num_stack_arg_slots()*VMRegImpl::stack_slot_size) >>LogBytesPerWord);
568 }
569
570 assert(closure._num_interpreted_frames == 0 || has_mixed_frames(), "");
571
572 if (!concurrent) {
573 assert(closure._size <= size + argsize() + frame::metadata_words,
574 "size: %d argsize: %d closure.size: %d end sp: " PTR_FORMAT " start sp: %d chunk size: %d",
575 size, argsize(), closure._size, closure._sp - start_address(), sp(), stack_size());
576 assert(argsize() == closure._argsize - (closure._num_frames > 0 ? frame::metadata_words_at_top : 0),
577 "argsize(): %d closure.argsize: %d closure.callee_interpreted: %d",
578 argsize(), closure._argsize, closure._callee_interpreted);
579
580 int calculated_max_size = closure._size
581 + closure._num_i2c * frame::align_wiggle
582 + closure._num_interpreted_frames * frame::align_wiggle;
583 assert(max_thawing_size() == calculated_max_size,
584 "max_size(): %d calculated_max_size: %d argsize: %d num_i2c: %d",
585 max_thawing_size(), calculated_max_size, closure._argsize, closure._num_i2c);
586
587 if (out_size != nullptr) *out_size += size;
588 if (out_oops != nullptr) *out_oops += closure._num_oops;
589 if (out_frames != nullptr) *out_frames += closure._num_frames;
590 if (out_interpreted_frames != nullptr) *out_interpreted_frames += closure._num_interpreted_frames;
591 } else {
592 assert(out_size == nullptr, "");
593 assert(out_oops == nullptr, "");
594 assert(out_frames == nullptr, "");
595 assert(out_interpreted_frames == nullptr, "");
596 }
597
598 if (has_bitmap()) {
599 assert(bitmap().size() == InstanceStackChunkKlass::bitmap_size_in_bits(stack_size()),
600 "bitmap().size(): %zu stack_size: %d",
601 bitmap().size(), stack_size());
602
603 int oop_count;
604 if (UseCompressedOops) {
605 StackChunkVerifyBitmapClosure<narrowOop> bitmap_closure(this);
606 bitmap().iterate(&bitmap_closure,
607 bit_index_for((narrowOop*)(sp_address() - frame::metadata_words_at_bottom)),
608 bit_index_for((narrowOop*)end_address()));
609 oop_count = bitmap_closure._count;
610 } else {
611 StackChunkVerifyBitmapClosure<oop> bitmap_closure(this);
612 bitmap().iterate(&bitmap_closure,
613 bit_index_for((oop*)(sp_address() - frame::metadata_words_at_bottom)),
614 bit_index_for((oop*)end_address()));
615 oop_count = bitmap_closure._count;
616 }
617 assert(oop_count == closure._num_oops,
618 "bitmap_closure._count: %d closure._num_oops: %d", oop_count, closure._num_oops);
619 }
620
621 return true;
622 }
623 #endif